Dissertations / Theses on the topic 'Melt loss'
To see the other types of publications on this topic, follow the link: Melt loss.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Melt loss.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Stuck, Tristan James. "Mineral equilibria constraints on open-system melting and consequences of melt loss in metabasic rocks." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/23028.
Full textAbstract:
Metabasic rocks constitute a significant proportion of the rock types found within orogenic metamorphic terranes, and the high temperature (T), suprasolidus behaviour of these lithologies provide an important contribution to the process of internal differentiation in the continental crust. The recent development of thermodynamic activity-composition (a-x) relations for high T mineral and melt phases allows the processes of melt generation and segregation to be quantified using high-resolution mineral equilibria modelling for the first time. In this work, calculated Pressure-Temperature (P-T) and Temperature-Mol. % SiO₂ (T-MSiO₂) phase diagrams are used to investigate the suprasolidus evolution of representative amphibolite and eclogite compositions under orogenic P-T conditions in the crust.
2
Elder, Catherine Margaret. "The Effects of Melt on Impact Craters on Icy Satellites and on the Dynamics of Io's Interior." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/556825.
Full textAbstract:
Over the last fifty years, our knowledge of the Solar System has increased exponentially. Many planetary surfaces were seen for the first time through spacecraft observations. Yet the interiors of most planetary bodies remain poorly studied. This dissertation focuses on two main topics: the formation of central pit craters and what this reveals about the subsurface volatile content of the target material, and the mantle dynamics of Io and how they relate to the extensive volcanism on its surface. Central pit craters are seen on icy satellites, Mars, the Moon, and Mercury. They have terraced rims, flat floors, and a pit at or near their center. Several formation mechanisms have been suggested. This dissertation assesses the feasibility of central pit crater formation via drainage of impact melt through impact-generated fractures. For impacts on Ganymede, the expected volume of melt and volume of fracture space generated during the impact and the volume of melt able to drain before fractures freeze shut all exceed the observed central pit volumes on Ganymede. This suggests that drainage of impact melt could contribute to central pit crater formation on Ganymede. Molten rock draining through solid rock fractures will freeze shut more rapidly, so this work suggests that impact melt drainage is unlikely to be a significant factor in the formation of central pit craters on rocky bodies unless a significant amount of volatiles are present in the target. Io is the most volcanically active body in the Solar System. While volcanoes are most often associated with plate tectonics on Earth, Io shows no signs of plate tectonics. Previous work has suggested that Io could lose a significant fraction of its internal heat through volcanic eruptions. In this dissertation, I investigate the relationship between mantle convection and magma generation, migration by porous flow, and eruptions on Io. I couple convective scaling laws to a model solving the two-phase flow equations applied to a rising column of mantle. I show that Io has a partially molten upper mantle and loses the majority of its internal heat through volcanic eruption. Next, I present two-dimensional numerical simulations that self-consistently solve the two-phase flow equations including mantle convection and magma generation, migration by porous flow, and eruption. These simulations produce a high heat flux due to volcanic eruption, a thick lithosphere, a partially molten upper mantle, and a high eruption rate—all consistent with observations of Io. This model also reveals the eruption rate oscillates around the statistical steady state average eruption rate suggesting that the eruption rate and total heat flux measurements from the past 35 years may not be representative of Io's long term behavior.
3
TAKAHASHI, Takafumi, Kazuya TANAKA, and Iwao KAWABE. "Lanthanide tetrad effect of Naegi granite-pegmatite suite, central Japan : Convex tetrad effect by fractional loss of fluid from hydrous felsic melt." Dept. of Earth and Planetary Sciences, Nagoya University, 2007. http://hdl.handle.net/2237/12873.
Full text
4
Mantheni, Dhruthiman Reddy. "NOVEL SOLIS STATE PROPERTIES OF DRUGS, POLYMERS AND VARIOUS CHEMICALS BY THERMAL AND ANALYTICAL TECHNIQUES." Cleveland State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=csu1356019701.
Full text
5
Harrison, K. A. "The fate of sulphur dioxide in meat products." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233204.
Full text
6
Kraft, David J. "A needs asses[s]ment of risk control services for Rotterdam International Safety Center, the Netherlands." Online version, 1999. http://www.uwstout.edu/lib/thesis/1999/1999kraft.pdf.
Full text
7
Childress, Lawrence D. "Shifts in Ritual Response to Loss due to Death: An Assessment of Funeral Service Mourning Trends over Time." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etd/2613.
Full textAbstract:
Bereavement, while universal, is experienced and expressed uniquely; it is both ultimate and particular. As the predominant social expression of grief, funerals are purported to be waning and/or transitioning to emergent, less conventional ceremonial forms. In this research, the possible salutary utility of funerals is outlined, and trends relative to the cost, nature (type), and prevalence of funeral services are examined relative to an extant data set from two funeral homes of shared ownership in northeast Tennessee. This data analysis of specific funeral trends in south central Appalachia is juxtaposed against the broader backdrop of current theoretical, clinical, and socio-cultural understandings of bereavement, grief, and mourning.
8
Fox, Daniel. "D-METHIONINE (D-MET) MECHANISMS UNDERLYING OTOPROTECTION FROM NOISE- AND AMINOGLYCOSIDE-INDUCED HEARING LOSS." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/1033.
Full textAbstract:
D-methionine (D-met) has demonstrated otoprotection from noise-, aminoglycoside-, and cisplatin-induced hearing loss in animal studies. As a result, D-met is currently progressing through translational "bench to bedside" research. However, D-met's exact otoprotective mechanisms have not been fully elucidated. This study investigated relationships between dose- and time-dependent D-met otoprotection from noise- and aminoglycoside-induced hearing loss. Further, the study correlated protective D-met dose to endogenous antioxidant enzyme activity and lipid peroxidation. Specific aim 1 tested D-met dose response protection by auditory brainstem response (ABR) threshold shift analysis and outer hair cell (OHC) quantification. D-met doses ranging from 25-200 mg/kg/dose were administered to chinchillas every 12 hours five times each before and after steady state noise exposure totaling 10 D-met doses. Results demonstrated optimal, sub-optimal, and supra-optimal bi-phasic D-met otoprotective dose response. Optimal D-met protection from steady state noise occurred at the 50 mg/kg/dose level. OHC quantification confirmed electrophysiological assessment. Specific aim 2 measured D-met rescue protection from steady state noise exposure by ABR threshold shift analysis and OHC quantification. Five intraperitoneal (ip) D-met injections were administered every 12 hours beginning 3, 5, 7, 9, 12, 18, 24, 36, or 48 hours after steady state noise exposure. Results measured full D-met protection when administration began as late as 24 hours after noise secession. Significant partial protection was also measured for the 36 hour delay. OHC quantification confirmed electrophysiological assessment. Specific aim 3 measured D-met preloading protection from steady state noise exposure by ABR threshold shift analysis and OHC quantification. Five ip D-met injections were administered every 12 hours beginning 2, 2.5, or 3 days prior to steady state noise exposure. Results measured significant D-met protection when administration ended as early as 24 hours prior to noise exposure. OHC quantification confirmed electrophysiological assessment. Specific aim 4 tested dose-dependent D-met influence on antioxidant enzyme activity and oxidative stress in steady state noise-exposed chinchillas. One ip D-met injection, ranging from 25 to 200 mg/kg/dose, was administered every 12 hours beginning 2 days prior to steady state noise exposure for a total of 5 injections. Two hours post-noise exposure, animals were sacrificed and serum, liver, and cochleae were collected for endogenous antioxidant analysis. Glutaredoxin 2 (Grx2) was also analyzed 21 days post-noise exposure. Lower D-met doses (25 and 50 mg/kg/dose) increased superoxide dismutase and catalase activity. Glutathione reductase and glutathione peroxidase activities significantly increased with D-met doses but only at high concentrations (200 mg/kg/dose). At 21 days post-noise, Grx2 activity was significantly decreased in liver but greatly increased in the cochlea with high D-met doses (200 mg/kg/dose). The endogenous enzyme studies suggest optimal protective D-met dose determined in specific aims 1 through 3 may be secondary to increased superoxide dismutase and catalase activity which may result from D-met's free radical scavenging characteristics. Glutathione pathway activity increased only with high D-met doses that resulted in less optimal protection in specific aim 1. Thus, D-met-induced glutathione pathway enhancement may be a compensatory or saturation mechanism rather than the primary protective mechanism. Further, the extended pre-loading and rescue protection may be a result of significantly increased s-glutathionylation activity in the cochlea. Specific aim 5 tested D-met protection from impulse noise exposures. D-met dose response, rescue, and antioxidant enzyme assay protocols, similar to those in specific aims 1, 3, and 4 in steady state animals, were performed on impulse noise-exposed chinchillas. D-met provided dose- and time-dependent optimal protection from impulse noise similar to the steady-state noise studies. Optimal D-met protection was measured at the 100 mg/kg/dose level with complete rescue protection as late as 24 hours post-noise exposure. Endogenous enzyme activity measures demonstrated significant superoxide dismutase, catalase, and glutathione peroxidase activity increases which correlated with optimal D-met protective dose (100 mg/kg/dose) and catalase and superoxide dismutase activity decreases at the higher doses (200 mg/kg/dose). Specific aim 6 tested dose-dependent D-met protection from tobramycin, amikacin, kanamycin, and gentamicin aminoglycoside antibiotics. Guinea pig animal models were normalized to achieve a 30-40 dB ABR threshold shift with the lowest possible aminoglycoside dose. D-met and the aforementioned single aminoglycoside were administered for 21, 28, 23, or 14 days, respectively. ABRs were collected and assessed at baseline, 2, 4, and 6 weeks after drug administration initiation. After the 6-week ABR data collection, cochleae were collected and prepared for OHC quantification. ABR threshold shifts and OHC quantifications demonstrate significant bi-phasic D-met-induced protection from each aminoglycoside type with different D-met doses. OHC quantification confirmed electrophysiological assessment. This study identified optimal protective D-met dose for aminoglycoside- and noise- induced ototoxicity. It also identified optimal protective D-met dose timing for steady state and impulse noise-induced hearing loss. Further, this study has identified dose-dependent D-met-induced endogenous antioxidant changes and Grx2 enhancement, and therefore s-glutathionylation, as a potential mechanism for D-met protection. Thus, dose- and time-dependent D-met protection influences endogenous antioxidant activity, but exact optimal D-met protection will continue to warrant further investigation.
9
Castillo, Palacios Miguel Angel. "Determinacion de la carga microbiologica de los principales productos carnicos que se expenden en los mercados de Riobamba /." Diss., CLICK HERE for online access, 1999. http://contentdm.lib.byu.edu/u?/Benson,4186.
Full text
10
Loos, Daniel [Verfasser], Tobias [Akademischer Betreuer] Melz, and Eckhard [Akademischer Betreuer] Kirchner. "Werkstoffbasierter Festigkeitsnachweis für elektrische Antriebskomponenten / Daniel Loos ; Tobias Melz, Eckhard Kirchner." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1207075531/34.
Full text
11
Wolmarans, Wilhelm J. "The effect of transport on live weight loss, meat quality and blood haematology in slaughter ostriches." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6762.
Full textAbstract:
Thesis (MScAgric (Animal Sciences))--University of Stellenbosch, 2011.ENGLISH ABSTRACT: The production and export of ostrich meat from southern Africa, to especially the European Union, are increasing rapidly due to the healthy nature of ostrich meat. The European Union has very high standards when importing food products, and it is inevitable that more emphasis is being placed on the production of high quality ostrich meat. Another aspect also of concern to consumers, is the welfare of animals prior to slaughter, and this forces producers to look at ways to decrease stress of animals during the ante-mortem period. Research regarding the effect of stress during the ante-mortem period, and as a result, on meat quality, haematology and weight loss in ostriches, is lacking and thus the purpose of this study was to investigate the effect of various transport distances, travel conditions and different birds on these factors. Ante-mortem stress was measured using serum corticosterone levels (ng/ml), heterophil: lymphocyte (H:L) ratio, white blood cell (WBC) count, aspartate aminotransferase (AST) and creatine kinase (CK), as well as the rate and extent of pH decline in the M. gastrocnemius. Special emphasis was also placed on the meat quality parameters drip loss, cooking loss, colour and Warner-Bratzler shear force (kg/1.27 cm diameter). Live weight losses, as well as carcass weight and weight of bruises cut off from each bird were also recorded during various stages of the trials. The effect of transport distance on the meat quality of ostriches was investigated. Ultimate pHu measurements were taken at 24 hours post-mortem. The muscles of the ostriches from the control group (i.e. birds that were not transported prior to slaughter) had a lower mean pHu (5.77 ± 0.053) than birds that travelled 60 (5.93 ± 0.053) and 600 km (6.11 ± 0.053), respectively. Differences in meat drip loss percentage were also observed between the three treatments. The birds in the control group (0.40 ± 0.07 %) had the lowest meat drip loss percentage compared to the birds that travelled 60 km (treatment C) (1.36 ± 0.07 %) and 600 km (treatment B) (0.97 ± 0.07 %), respectively, to a commcerical ostrich abattoir. Ostriches that were transported for 600 km (8.13 ± 1.16 %) had a greater percentage live weight loss during the antemortem period than birds that travelled a distance of 60 km (2.4 ± 2.185 %) to the abattoir, although both groups were deprived of feed for the same period. When the haematology of the groups that travelled different distances was compared at various time intervals in the ante-mortem period, both groups of birds experienced significant increases in WBC, s-AST and s-CK. An increased H:L ratio from pre-transport to post-transport was only evident in the birds that travelled 600 km (treatment B). However, the birds that travelled 60 km were the only group of birds that had significant elevated serum corticosterone levels during the ante-mortem period. The increase in the various blood parameters indicates severe physical stress, which negatively affected meat quality. Another trial also investigated the effect of various farming systems and transport on meat quality and bruising of ostrich carcasses. Ostriches were raised in three different farming systems, i.e. feedlot -, semiintensive - and free range conditions. Other factors that could maybe impact on stress susceptibility, such as road conditions, floorspace and floor type were also investigated. A significant difference in meat pHu was found between ostriches that were raised in a feedlot (5.95 ± 0.018) and semi-intensive (6.04 ± 0.033) environment. The feedlot birds also had the greatest percentage of carcass weight removed due to bruising. The free range birds were the birds that had the lowest floor density per birds and also had the least amount of bruising on their carcasses. Incidently the other two groups (feedlot and semi intensive) were the birds that travelled on the same type of road (mountain pass) in a truck with rubber flooring whilst the free range birds travelled on a straight road in trucks with metal grid floors.The results indicate that the type of farming system didn’t have a significant influence on meat quality of ostriches, but that factors such as road conditions, flooring and bird density did play a significant role in the incidence of bruises and injuries obtained during transport.
AFRIKAANSE OPSOMMING: Die produksie en uitvoer van volstruisvleis vanuit suidelike Afrika, na veral die Europese Unie, is gedurig aan die toeneem as gevolg van die gesonde aard van volstruisvleis. Die Europese Unie het baie hoë standaarde wanneer dit kom by die invoer van voedselprodukte en dit is onvermydelik dat meer klem op die produksie van hoë gehalte volstruisvleis gelê word. ʼn Ander aspek wat ook kommer wek by verbruikers is die welstand van diere voor slagting en hierdie aspek noodsaak produsente om te kyk na maniere om stres te beperk tydens die periode voor slagting. Navorsing rakende die effek van stres tydens die ante-mortem periode, asook vleiskwaliteit, hematologie en gewigsverlies in volstruise as gevolg van vervoer, ontbreek. Die doel van die studie was dus om die invloed van verskillende vervoerafstande, vervoersomstandighede en tipe produksiesisteme op volstruise se stresrespons te ondersoek. Die omvang van ante-mortem stres is bepaal deur die serum-kortikosteroon vlakke (ng/ml), heterofiel: limfosiet (H:L) ratio, witbloedsel (WBS) telling, aspartaat aminotransferase AST en creatien kinase CK, asook die tempo en vlak van pH-daling in die M. gastrocnemius, te meet. Spesiale klem is gelê op die vleisgehalte parameters kookverlies, drupverlies, kleur en Warner-Bratzler-skeurwaardes (kg/1.27 cm deursnee). Gewigsverlies is aangeteken op verskillende stadiums tydens die proewe. Karkasgewigte en die hoeveelheid gewig afgesny van elke volstruiskarkas a.g.v. kneusings is ook bepaal. Die eerste studie het die invloed van vervoerafstand op vleiskwaliteit van slagvolstruise ondersoek. Vleis kwaliteit parameters soos pH, drip verlies, kook verlies, taaiheid en kleur is ondersoek. Die pHu metings is op 24 uur post-mortem geneem. Slagvolstruise in die kontrole groep (d.i. -volstruise wat nie voor slagting vervoer is nie) het ’n laer vleis pHu (5.77 ± 0.05) gehad as voëls wat onderskeidelik 60 km (5.93 ± 0.05) en 600 km (6.11 ± 0.05) ver vervoer is. Verskille in persentasie dripverlies is gesien tussen die vleis van die voëls wat nie vervoer is nie (0.40 ± 0.07 %) en die voëls wat 60 km (1.36 ± 0.07 %) en 600 km ver (0.97 ± 0.07 %) onderskeidelik vervoer is. Volstruise wat vir 600 km (8.13 ± 1.16 %) vervoer is, het ‘n groter persentasie lewende gewig tydens die ante-mortem periode as voëls wat 60 km (2.4 ± 2.19 %) ver vervoer is na die abattoir, verloor, al was beide groepe weerhou van voer vir dieselfde tydperk. Beide groepe wat vervoer is (60 en 600 km) het merkbare toenames in witbloedsel (WBS) tellings, s-AST’s en s-CK’s getoon tydens die ante-mortem periode. Daar is slegs ʼn toename in H:L ratio (ʼn indikator van stres) van voor vervoer tot na vervoer gesien in die voëls wat 600 km vervoer is. Daarteenoor was die voëls wat slegs 60 km vervoer is die enigste voëls wat ʼn toename in korticosteroon vlakke getoon het gedurende die ante-mortem periode. Die toenames is heel moontlik ‘n aanduiding van erge fisiese stres wat ‘n negatiewe effek op vleiskwaliteit het. Die tweede studie het die effek van verskillende produksiesisteme en die stress respons van die verskillende groepe slagvolstuise op vervoer ondersoek. Vleis kwaliteit parameters soos pH, drip verlies, kook verlies en taaiheid is ondersoek. Die hoeveelheid kneusings per volstruis is ook gemeet. Daar was ‘n beduidende verskil (P = 0.009) tussen die pHu van die voerkraal (5.95 ± 0.018) en semi- intensiewe (6.04 ± 0.033) volstruise. Die voerkraal volstruise se vleis het die grootste drip- en kookverliese gehad in vergelyking met die ander twee groepe (semi-intensiewe en ekstensiewe) terwyl die ekstensiewe volstruise die taaiste vleis gehad het. Die voerkraalvoëls het ook die grootste persentasie karkasgewig verloor a.g.v. kneusings wat afgesny is. Die ekstensiewe voëls het die laagste vloer digtheid per volstruis gehad asook die minste kneusings. Die ander twee groepe (voerkraal en semi intensief) was die groepe wat op dieselfde pad vervoer is (bergpas) in vragmotors wat rubber vloere gehad het terwyl die ekstensiewe voêls op ‘n reguit pad vervoer is in ‘n vragmotor met ‘n metaal oppervlakte. Die resultate van die studie is ‘n aanduiding dat die tipe plaassisteem nie ‘n groot impak op die hoeveelheid akute stres ervaar deur die voëls tydens vervoer gehad het of gevolglik op die vleiskwaliteit van die volstruise nie, maar dat faktore soos pad toestand, tipe vloer en voëldigtheid wel ‘n wesenlike rol speel in die voorkoms van kneusings en beserings opgedoen tydens vervoer.
12
Elves, Rachel Leigh. "Consequences of mitotic loss of heterozygosity on genomic imprinting in mouse embryonic stem cells." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/1564.
Full textAbstract:
Epigenetic differences between maternally inherited and paternally inherited chromosomes, such as CpG methylation, render the maternal and paternal genome functionally inequivalent, a phenomenon called genomic imprinting. This functional inequivalence is exemplified with imprinted genes, whose expression is parent-of-origin specific. The dosage of imprinted gene expression is disrupted in cells with uniparental disomy (UPD), which is an unequal parental contribution to the genome. I have derived mouse embryonic stem (ES) cell sub-lines with maternal UPD (mUPD) for mouse chromosome 6 (MMU6) to characterize regulation and maintenance of imprinted gene expression.
The main finding from this study is that maintenance of imprinting in mitotic UPD is extremely variable. Imprint maintenance was shown to vary from gene to gene, and to vary between ES cell lines depending on the mechanism of loss of heterozygosity (LOH) in that cell line. Certain genes analyzed, such as Peg10, Sgce, Peg1, and Mit1 showed abnormal expression in ES cell lines for which they were mUPD. These abnormal expression levels are similar to that observed in ES cells with meiotically-derived full genome mUPD (parthenogenetic ES cells).
Imprinted CpG methylation at the Peg1 promoter was found to be abnormal in all sub-lines with mUPD for Peg1. Two cell sub-lines which incurred LOH through mitotic recombination showed hypermethylation of Peg1, consistent with the presence of two maternal alleles. Surprisingly, a cell sub-line which incurred LOH through full chromosome duplication/loss showed hypomethylation of Peg1. The levels of methylation observed in these sub-lines correlates with expression, as the first two sub-lines showed a near-consistent reduction of Peg1, while the latter showed Peg1 levels close to wild-type.
Altogether these results suggest that certain imprinted genes, like Peg1 and Peg10, have stricter imprinting maintenance, and as a result show abnormal expression in UPD. This strict imprint maintenance is disrupted, however, in UPD incurred through full chromosome duplication/loss, possibly because of the trisomic intermediate stage which occurs in this mechanism.
13
Korsukovas, Audrius. "Kiaulienos cheminių, fizinių ir technologinių savybių kitimas giluminio užšaldymo ir laikymo metu." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060228_105211-18106.
Full textAbstract:
Introduction. At low temperature the preservation of foodstuffs is one of the best ways of their storage and therefore this method is widely used in meat industry. The low temperature suppresses the activity of microorganisms and tissue ferments. Therefore the meat preserved by freezing keeps for a long time its initial properties and there are only minimal changes of food value and taste. At low temperature the activity of ferments slows down but does not stop.
Work object. The work object is the determination of the change of physical-chemical properties of meat during freezing and keeping in - 180 C and - 860 C temperature.
Work methodics. The research as fulfilled at the laboratory of the evaluation of the cattle meat properties and the meat quality. For the rersearch taken 14 Lithuanian white pig meat samples the mean weight of which was 500 g. were taken. They were put into special freezing bags and were frozen at temperature -180 C, and -860 C. Before freezing it the physical-chemical properties of the meat were determined. Two examples from each meat samples were researched. The determination of the physical-chemical properties of the meat was fulfilled every month.
Also were was taken 6 Lithuanian white pig meat samples the mean weight of which was 500 g. Before freezing it the physical-chemical properties of the meat were determined. After that was made green tea extract, 500 ml. Water ant 50 g tea. All extract was inject in to the meat samples. They were put... [to full text]
14
Holma, T. (Tuomas). "Hearing among Finnish professional soldiers:epidemiological study." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526210308.
Full textAbstract:
Abstract Soldiers are at risk of incurable noise-induced hearing loss (NIHL) in military activities. Therefore the prevention of hearing loss is important. The large variation in individual susceptibility to NIHL is well known but the reason for this is not completely understood. The data of this current comprehensive register-based follow-up study consist of the health records, hearing measuring results and occupational history of 1 941 soldiers. The occurrence and degree of hearing losses among soldiers who served between 1965 and 2007 was investigated by comparing groups formed according to year-class and service branch. An association between cardiovascular risk factors and NIHL was also assessed. Furthermore the efficacy of the hearing conservation measures carried out by the Finnish Defence Forces (FDF) and the Finnish Border Guard (FBG) was evaluated. Noise turned out to be the major risk factor of hearing impairment among the investigated soldiers. The occurrence of NIHL (hearing threshold at 3,4 or 6 kHz > 40 dB) was at least around 10 percentages lower among soldiers who started their career in 1990s than in the older year-classes 15 years after the beginning of military career. Concurrently, the decline of the average degree of hearing loss at high tones improved around 20 dB. The occurrence of NIHL was the lowest among pilots, musicians and naval soldiers, and the highest among soldiers in engineering and air defense corps. No clear difference was found between cardiovascular risk factors and NIHL with the exception of hyperglycemia. A clear temporal connection was found between the decline of the occurrence of NIHL among the soldiers and the hearing conservation measures carried out in the late 80s. A review of the four-stage hearing classification used in Finnish occupational health service since the 1970s, as well as the guidelines that rely on them, is neededTiivistelmä Melu aiheuttaa sotilaille palautumattoman kuulovaurion riskin, minkä vuoksi meluvammojen ehkäisy on tärkeää. Yksilöiden meluvamma-alttiudessa tiedetään olevan suuria eroja. Syytä tähän ei vielä kovin hyvin tunneta. Tämän laajan rekisteritutkimuksen aineisto koostui 1941 sotilaan terveystarkastustiedoista, kuulontutkimustuloksista ja työhistoriatiedoista. Tutkimuksessa selvitettiin meluvammojen esiintyvyyttä ja vaikeusastetta vuosina 1965−2007 palvelleilla suomalaisilla ammattisotilailla vertailemalla vuosikurssin ja aselajin mukaan valittuja ryhmiä sekä tutkittiin sotilaiden sydän- ja verisuonisairauksien riskitekijöiden ja meluvammojen yhteyttä. Lisäksi tarkasteltiin Suomen puolustusvoimissa ja Rajavartiolaitoksessa toteutettujen kuulonsuojelutoimenpiteiden vaikuttavuutta. Melu osoittautui olevan merkittävin kuulovian riskitekijä tutkitussa aineistossa. Viidentoista palvelusvuoden jälkeen ilmenneiden meluvammojen (kuulokynnys taajuudella 3,4 tai 6 kHz > 40 dB) määrä oli vähintään kymmenen prosenttiyksikköä pienempi sotilailla, jotka aloittivat uransa 1990-luvulla verrattuna vanhempien vuosikurssien sotilaisiin. Samanaikaisesti korkeiden äänien kuuloviat lievenivät noin 20 dB:n verran. Meluvammariski oli pienin lentäjillä, soittajilla ja laivastosotilailla ja suurin pioneereilla ja ilmatorjuntasotilailla. Sydän- ja verisuonisairauksien riskitekijöistä ainoastaan korkea verensokeri näytti selkeästi liittyvän kohonneeseen meluvammariskiin. 1980-luvun lopulla toimeenpantujen kuulonsuojelutoimenpiteiden ja sotilaiden kuulon parantumisen välillä on nähtävissä selkeä ajallinen yhteys. Suomessa 1970-luvulta lähtien käytetyssä neliportaisessa kuuloluokituksessa ja siihen tukeutuvissa käytännöissä ilmeni puutteita, joiden vuoksi suomalaisen työterveyshuollon kuulonhuoltoa koskeva ohjeistus on aiheellista tarkistaa
15
Carver, Kirsty, and C. Parkin. "Working with graphic design students to promote `Land of Lost Content¿ at Leeds Met." SCONUL, 2009. http://hdl.handle.net/10454/4195.
Full textAbstract:
yesAs Leeds Metropolitan is a university of festivals and partnerships, the library was given the opportunity this year to host a festival to promote the library and all its services to the university. The library festival was a week of events and activities to promote the library and its space in new ways. It was a good way to remind staff and students of the value of libraries, not only as places to learn but also as places to enhance our leisure and working lives ... we chose to promote the database `Land of Lost Content¿. This was because graphic design and art students are based at our campus and we also thought this database would attract a wide range of students who might otherwise think that electronic databases contain little of interest for them. Our promotion has been so successful in many ways that we would like to share our experience with other librarians.
16
Wilson, Patricia Lynn. "Educational strategies meet the needs of Juvenile offenders." CSUSB ScholarWorks, 2001. https://scholarworks.lib.csusb.edu/etd-project/1984.
Full text
17
Gebien, Darryl Jordan. "Loss of heterozygosity analysis of c-met and an adjacent locus, D7S95, in human non-small cell lung carcinoma." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29697.pdf.
Full text
18
Gebien, Darryl Jordan. "Loss of heterozygosity analysis of c-met and an adjacent locus, D7S95, in human non-small cell lung carcinoma." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27322.
Full textAbstract:
The c-met proto-oncogene encodes a tyrosine kinase receptor for hepatocyte growth factor/scatter factor. Losses of c-met alleles have been documented in human carcinomas. In breast carcinoma c-met has been suggested to be a potential inactivated tumour suppressor gene (TSG). In non-small cell lung carcinoma (NSCLC) a general reduction of c-met expression in squamous cell carcinomas (SQCCs), as well as overexpression in adenocarcinomas (ADCs) have been revealed. Furthermore, many SQCCs and ADCs had undetectable c-met mRNA and protein. These results prompted us to explore c-met allelic alterations in NSCLC. Our main goal was to address the possible involvement of inactivated c-met alleles in the development and progression of NSCLC. In this LOH analysis two polymorphic-sensitive probes corresponding to the c-met gene, p-metH and p-metD, were used to analyze normal and tumour DNA samples from patients with primary NSCLC. Of 110 cases examined with p-metH, 56 (50.9%) were informative and 4 (7.1%) exhibited LOH. Among 109 patients examined with p-metD, 28 (25.7%) were informative and 1 (3.6%) was LOH-positive. The combined LOH incidence for c-met was 7.4% (5/68 informative cases). Lastly, since a locus adjacent (distally) to c-met on chromosome 7, D7S95, was shown to exhibit a significant LOH frequency in gastric carcinoma (43.3%), we also sought to determine if loss of this locus was common in NSCLC. Of 104 patients examined at D7S95, 45 (43.3%) were informative and 1 (2.2%) exhibited LOH. These findings suggest, firstly, that c-met does not have a possible role as an inactivated TSG in the tumourigenesis of NSCLC nor is it closely linked to a putative TSG, and secondly, D7S95 does not contain a detectable inactivated TSG or a closely-mapping TSG in NSCLC.
19
Andersson, Josefin, and Ebba Lindmark. "Är det möjligt att uppnå kraven för FEBY Guld oavsett en byggnads placering i Sverige? : Is it possible to meet the requirements for FEBY Gold regardless of location in Sweden?" Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-82741.
Full textAbstract:
I dag sätts flera åtgärder in för att bromsa klimatförändringarna, både inom Sverige och på internationell nivå. ‘Forum för energieffektivt byggande’, FEBY, är en organisation som arbetar med att driva utvecklingen av lågenergibyggnader framåt. FEBY har tagit fram ett certifieringssystem som ska hjälpa byggherrar uppföra byggnader med lägre energianvändning. För att en byggnad ska bli certifierad krävs det att den uppfyller vissa krav, bland annat på värmeförlusttal. Sedan starten 2008 har ca 50 småhus certifierats enligt systemet, vilket väcker frågan om varför så få småhus har certifierats och om detta kan bero på hur kraven är ställda.Syftet med rapporten är att undersöka om de krav som FEBY ställer på värmeförlusttal är rimliga vid byggande av ett småhus oavsett vart i Sverige det är placerat. Undersökningen har gjorts för tre orter i olika delar av Sverige; Lund, Falun och Boden. Byggnadens utformning är densamma på alla tre orter, med undantag för isolertjocklek i ytterväggen. Parametrarna fönsterglasarea, U-värde på fönster, luftläckning och köldbrygga varierades i beräkningarna för att få ett bredare och mer trovärdigt resultat.Undersökningen görs enligt de beräkningar som FEBY hänvisar till i dokumentet FEBY18 med utgångspunkt i krav för värmeförlusttal på nivå FEBY Guld.Rapporten avgränsas till en enplansvilla på 100 m2 uppvärmd golvarea. Ingen hänsyn tas till faktorer så som ljud, sol, fukt, årsvärmefaktor eller värmebalans för luftvärmd byggnad. Inte heller beaktas bärförmåga, motstånd mot brand eller fönstrens läge.Resultatet visar att negativa U-värden uppstår vid flera parametervariationer i Boden och Falun. Negativa U-värden indikerar att ytterväggen måste producera värme, vilket i det här fallet inte är möjligt. I flera fall i Falun och Boden förekommer även så pass låga U-värden att isoleringen behöver anta en tjocklek på över en meter medan isolertjockleken i Lund aldrig överstiger 500 mm. Vid de mest gynnsamma förutsättningarna visar resultatet att det fortfarande är svårt att nå en rimlig isolertjocklek, eller ett positivt U-värde, i Boden och delvis Falun.Slutsatsen är att det går att konstruera en byggnad som når kraven för nivå FEBY Guld i södra Sverige, men att det blir svårare ju längre upp i landet som byggnaden ska uppföras. Tjockare isolering verkar inte göra kraven uppnåeliga i Sveriges norra delar utan med de förutsättningar som undersöks skulle väggen behöva skapa värme om värmeförlusttalet för FEBY Guld ska nås.In the current political climate, several measures are implemented to prevent climate change both in Sweden and internationally. ‘Forum för Energieffektict Byggande’, FEBY, is an 6rganization that aims to contribute to the development and expansion of low-energy buildings. To this end, FEBY has created a certification scheme to help contractors develop buildings with lower energy consumption. To certify a building, the contractor must ensure that certain requirements are met, for example heat loss figures. Since the conception of the certification, only about 50 small houses have been certified. This raises the question of why so few small houses have been certified, and whether this is due to how the requirements are set.The purpose of this report is to investigate whether the heat loss figures that features in FEBY’s certification are reasonable in reference to the construction of small houses regardless of its location in Sweden. To examine this, this study features small house construction in Lund, Falun, and Boden. The overall building design is the same in all three locations, apart from the insulation thickness in the outer wall. The examined parameters for this study include window glass area, U-value of windows, air leakage, and thermal bridges varied in the calculations to ensure a more relevant and reliable result.This study is based on the calculations referred to in the document named FEBY18 which is based on the requirements for heat loss figures according to the FEBY Gold level.The report is limited to a single-floor house of 100 m2 of heated floor area. Factors such as sound, sun, moisture, annual heat factor, or heat balance for air-heated buildings are not considered. Nor is bearing capacity, resistance to fire, or the position of the windows, considered within the study.The result shows that negative U-values occur in several parameter variations in Boden and Falun. Negative U-values indicate that the outer wall must produce heat, which is not possible due to the construction of the wall. In several cases in Falun and Boden the U-values were so low that the insulation would need a thickness of more than one meter, while the insulation thickness in Lund never has to exceed 500 mm. Even during the most favorable conditions, the results still show the difficulty of achieving reasonable insulation thickness, as well as a positive U-value. This is especially true with regards to Boden, but in part also Falun.In conclusion, while it is possible to construct a small house that meet the requirements for the level FEBY Gold in the south of Sweden, it is increasingly challenging the further north you attempt to construct such a building. Even using thicker insulation, the requirements are difficult, if not impossible, to achieve in the north of Sweden. Under current conditions, the wall would need to generate its own heat to meat the heat loss figure demanded by the FEBY Gold standard.
20
Don, Sarah M. "Loss-of-flow analysis of an unfinned, graded fuel meat, LEU monolithic U-10Mo fuel design in support of the MITR-II fuel conversion." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/95600.
Full textAbstract:
Thesis: S.M., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2014.Thesis: S.B., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 113-115).
In order to satisfy requirements of the Global Threat Reduction Initiative (GTRI), the 6 MW MIT Research Reactor (MITR-II) is to convert from the current 93%-enr 235U highly-enriched uranium (HEU) fuel to the low-enriched uranium (LEU, <20% 235U) fuel. This reduction in enrichment decreases the neutron flux level due to parasitic absorption by 238U. The neutron flux may be compensated for by increasing the reactor's nominal operating power level to 7.0 MW. Thus a neutronic and thermalhydraulic study was undertaken to evaluate new fuel designs with graded fuel meat thickness and unfinned clad that provide sufficient safety margins for steady-state operation at 7.0 MW. A previously-studied 18-plate LEU fuel design and an identical unfinned fuel design were compared to evaluate the effect of fin removal, demonstrating the need for fuel redesign. A recent feasibility study has shown that a 19-plate, unfinned fuel design with graded fuel meat thicknesses (19B25) provides fuel cycle length and steady-state thermal hydraulic safety margins that meet the design criteria. The objective of this study was to use the RELAP5 MOD3.3 code to confirm the steady-state thermalhydraulic safety margin and to analyze the loss-of-flow (LOF) transient performance of this candidate fuel design. Power distributions obtained for beginning-of-life (BOL), middle-of-life (MOL), and end-of-life (EOL) were analyzed to study the effect of core power distribution and burnup-dependent thermal properties on safety margins. Results show that the MITR-II can safely operate at 7.0 MW with the proposed LEU fuel with an adequate margin (40%) to the onset of nucleate boiling (ONB) -limiting power level. The minimum margin between coolant channel wall and saturation temperatures was at least 22 C in the most limiting channel, in the most limiting core (BOL) at 7.0 MW. The proposed LEU fuel design also performed well during a simulated LOF transient after operation at 7.0 MW, with a peak fuel temperature of 106 C reached in the hot channel, which is well below the U-1OMo blistering temperature of 365*C. During the LOF transient, the maximum clad temperature was 980, meaning that no boiling occurred even during the LOF transient. Bounding analysis to evaluate the effect of an oxide layer and fuel meat thermal conductivity due to fuel burnup estimated that up to a 15 C peak fuel temperature rise can be attributed to increased thermal resistance of oxide layer and fuel thermal conduction reduction. Thus under the most conservative assumption, the estimated peak fuel temperature is 121 C, well under the blistering temperature limit of 365 C. It is concluded that the 19-plate unfinned fuel design with graded fuel meat thickness is a promising candidate for the conversion to LEU fuel and power uprate.
by Sarah M. Don.
S.M.
S.B.
21
Mastori, Helena. "Mécanismes de dégradation des bétons lors de l'interaction corium-béton." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0069.
Full textAbstract:
Cette thèse porte sur la caractérisation de bétons siliceux (S) et silico-calcaires (SC) lorsqu’ils sont exposés à des températures élevées. Une hypothèse motivant ce travail est que la compréhension de la dégradation des propriétés de ces bétons, en avance du front de fusion, pourrait apporter de nouvelles pistes pour interpréter les résultats de ces expériences. Des échantillons n’ayant jamais été mis en contact avec des métaux/oxydes en fusion ont d’abord été étudiés. La thermogravimétrie, la porosimétrie par intrusion de mercure et l’impédancemétrie complexe ont été utilisées pour décrire leurs propriétés après qu’ils ont été soumis à des températures pouvant atteindre 1000°C. Les résultats de l'ATG ont permis l’identification de domaines de température dans lesquels des mécanismes de dégradation spécifiques sont activés. Ceux de porosimétrie ont montré que les volumes poreux et la taille typique des pores augmentent de manière importante avec la température. Il est par ailleurs démontré qu’à 1000°C, la surface d’échange des bétons SC est deux fois plus importante que celle des bétons S. Enfin, les tortuosités élevées obtenues par impédancemétrie suggèrent une topologie des réseaux poreux d’une grande complexité. Dans une deuxième partie de cette thèse, les échantillons de bétons étudiés ont été préalablement mis en contact avec des métaux et/ou des oxydes en fusion. Ils ont été analysés par tomographie X ou par microscopie électronique à balayage. Aucun phénomène d’imprégnation des phases métal/oxyde n’a pu être observé. Des signatures de possibles phénomènes de percolation de ces phases par des mécanismes de décarbonatation ont toutefois été mises en évidenceThis thesis deals with the characterization of siliceous (S) and limestone-siliceous (SC) concretes when exposed to high temperatures. The understanding of the degradation of their properties, in advance of the melt front, is the hypothesis that motivates this work since it could bring new avenues to interpret the results of these experiments. Samples that have never been in contact with molten metals/oxides were first studied. Thermo-gravimetry, mercury intrusion porosimetry and complex impedancemetry were used to describe their properties after they were subjected to temperatures up to 1000°C. Thermo-gravimetric analyses allowed the identification of temperature domains in which specific degradation mechanisms are activated. Those of porosimetry showed that porous volumes and typical pore sizes increase significantly with the temperature. It is also demonstrated that at 1000°C, the exchange surface of SC concretes is twice as large as that of Sconcretes. Finally, the high tortuosity obtained by impedancemetry suggests a topology of porous networks of great complexity. In a second part of this thesis, the studied concrete samples were previously in contact with molten metals and/or oxides. They were analysed by X-ray tomography or scanning electron microscopy. No phenomenon of impregnation of the metal/oxide phases could be observed. Signatures of possible phenomena of percolation of these phases by decarbonation mechanisms have however been demonstrated
22
Hernández, Rubio Francisco José. "Los límites del eliminacionismo. Una solución epigenética al problema mente-cerebro." Doctoral thesis, Universidad de Murcia, 2010. http://hdl.handle.net/10803/10837.
Full textAbstract:
En la presente Tesis Doctoral se ensaya una disolución del problema mente-cerebro, así como un replanteamiento del problema mente-cuerpo, a través de un estudio de la idea de epigénesis. Exploramos tres momentos clave en su fundamentación filosófica: la embriología alemana del XVIII, la histología/biología del XIX y la neurología, filosofía de la mente y biología evolutiva del XX. Al unísono de su estudio introducimos nuestro planteamiento epigenético del problema mente-cuerpo: la mente no es una sustancia, pero tampoco, como lo quiere el materialismo eliminacionista, un mito: es un proceso dinámico que emerge del complejo funcionar del organismo que conforman el cerebro/sistema nervioso en sus ricas interrelaciones en y con el cuerpo, y de éste con el medio natural y cultural. Cuerpo y cerebro se entrelazan al son de procesos no sólo genéticos, sino también epigenéticos, a través de los cuales las funciones mentales pueden emerger y terminar siendo operativas.This Ph.D. essays a dissolution of the mind-brain problem, and offers a reformulation of the mind-body problem through the study of the idea of epigenesis. We explore three key moments in its philosophical grounding: XVII century´s German Biology, XIX´s Histology and Biology and XX´s Neurology, Philosophy of Mind and Evolutionary Biology. Paralelly, we introduce our epigenetic approach to the mind-body problem: mind is not a substance as defined by the Cartesian tradition, but neither a myth, as eliminativism sees it: it as a dynamical process which emerges from the complex operations maintained both in the organism (conformed by the rich interrelationships between the brain/nervous system and the body), and the ones maintained with the environment (both natural and cultural) by it as a whole. Body and brain intertwine inseparably not only by genetic processes, but also epigenetic ones, through which the mental functions can emerge and end up being operative.
23
Gomez, Ortega Arturo. "Prototypage rapide de pièces en alliage d’aluminium : étude du dépôt de matière et d’énergie lors de la fusion à l’arc d’un fil par le procédé MIG-CMT." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS067/document.
Full textAbstract:
Un nouveau procédé de fabrication additive de pièces métalliques, basé sur le procédé de soudage à l’arc appelé CMT (Cold Metal Transfert), est étudié dans l’objectif de réaliser des pièces en alliage d’aluminium Al-5Si. Un banc de fabrication additive basé sur le principe des imprimantes 3D open source, sur lequel a été intégré le procédé CMT, a été spécialement développé. Le procédé CMT permet de contrôler la fusion d’un fil d’aluminium et son dépôt sous la forme de gouttelettes sur la surface de construction, formant après solidification des « cordons » qui peuvent être superposés pour fabriquer des pièces. L’influence des paramètres du procédé sur les phénomènes de transfert de matière et de chaleur lors de la fusion du métal et de son dépôt sur la surface de construction, ainsi que sur les caractéristiques géométriques des cordons déposés, dans le cas de dépôts mono-cordon, puis dans le cas de murs formés par la superposition d’un grand nombre de cordons, est étudiée. Plusieurs défauts géométriques ont été observés, et les conditions de leur apparition analysées, grâce notamment à l’utilisation d’une caméra rapide. La compréhension des relations entre paramètres procédé, mécanismes de transfert de chaleur et de matière, et géométrie des cordons, a permis de corriger ces défauts en identifiant puis modifiant les paramètres procédé responsables de leur apparition. Enfin, une méthode de contrôle en ligne du procédé, basée sur l’analyse des signaux de tension et d’intensité produits par le générateur de soudage au cours du phénomène de dépôt, qui permet de détecter précocement l’apparition de défauts, et ainsi de modifier les paramètres procédé avant qu’ils ne s’amplifient, a été proposéeA new additive manufacturing process for metallic parts, based on the arc welding process known as CMT (Cold Metal Transfer), is studied with the objective of building parts with the aluminium alloy Al5Si. A workbench for additive manufacturing based on the 3D printers open-source principle, on which the CMT generator was integrated, was specially developed. The CMT process allows to control the aluminium wire melting and its deposition under the form of droplets on the building surface, forming, after solidification, beads that can be superposed for the parts construction. The process parameters influence on the material transfer and heat transfer during the metal melting and deposition on the build surface, as well as on the geometric characteristics of the deposed beads, in the case of mono-layer deposits, and in the case of multi-layer walls, is studied. Many geometric defects were observed, and their apparition conditions analysed, thanks in particular to the use of a high-speed camera. The understanding of the relations between the process parameters, the melting and heat transfer mechanisms, and the beads geometry, allowed the defects correction by identifying and modifying the process parameters responsible of their apparition. Finally, an on-line control method for the process, based on the analysis of the voltage and current signals produced by the welding generator during the deposition phenomena, making possible the early detection of defects, and then the modification of the process parameters before they are amplified, has been proposed
24
Gagnon, Marianne. "Les pratiques de partenariat perçues actuellement lors de la transition CPE/Maternelle le discours politique du MELS et du MFACF et les orientations ministérielles /." Thèse, [Rimouski, Québec] : Université du Québec à Rimouski, 2006.
Find full textAbstract:
Thèse (M. A.) - Université du Québec à Rimouski, 2006.Titre de lʹécran-titre (visionné le 25 avril 2007). Mémoire présenté à l'Université du Québec à Rimouski comme exigence partielle du programme de maîtrise en éducation. Comprend un résumé. CaQRU CaQRU CaQRU Bibliogr.: f. 105-112. Paraît aussi en éd. imprimée. CaQRU
25
Élez, Fernández Mª Elena. "Nuevas terapias en cáncer colorrectal metastásico refractario: papel de los fármacos que interfieren en la vía de met e integrinas." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/308313.
Full text
26
Gálvez, Vidal Claudia Andrea. "Desarrollo de packaging de exportación para los Estados Unidos: para una línea de productos de la Empresa "Mel Alimentos Ltda"." Tesis, Universidad de Chile, 2007. http://www.repositorio.uchile.cl/handle/2250/101004.
Full textAbstract:
El presente proyecto trata sobre el packaging de exportación y las normas de los Estados Unidos. En el marco del Tratado de Libre Comercio con dicho pais se han abierto las puertas al ingreso de una vasta gama de productos. El objetivo general de esta investigación será evaluar el diseño de etiquetas para conservas de fruta en frascos de vidrio, bajo las normas del TLC con los Estados Unidos, para una PYME, exportadora de conservas dulces como mermeladas
27
Des, Rochers Arianne. "Les stratégies de résistance féministe, lost in translation : comment la prose d'Ena Lucía Portela met les éthiques de la traduction à l'épreuve." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31877.
Full textAbstract:
La traduction peut-elle véritablement créer un dialogue transculturel éthique et non hiérarchique? C'est la question que souhaite déconstruire cette thèse, plutôt que d'y répondre. Celle-ci s'articule ainsi autour de la notion d'éthique de la traduction : en explorant d'abord certains des récents développements en théorie féministe et en traductologie, nous souhaitons découvrir les fondements de différentes éthiques du traduire afin de les mettre à l'épreuve. Puis, en analysant le style de l'auteure cubaine dissidente et transgressive Ena Lucía Portela en traductions française et anglaise, nous découvrons que la traduction fait subir de nombreux changements au discours transgressif de l'auteure, inscrivant celui-ci dans les normes des cultures d'arrivée. Nous en concluons que la pratique de la traduction doit revoir ses objectifs et ses stratégies et prendre en considération les arguments des théories féministes actuelles si elle veut pouvoir prétendre participer à un dialogue éthique et avoir une « visée résistante ». La présente thèse propose ainsi une réflexion féministe transnationale sur l'éthique et sur la pratique de la traduction littéraire à l'heure actuelle.
28
Morales, Moreno Verónica Yunuen. "Producción y uso de notaciones y su relación con el conocimiento de los estados mentales en niños de 3 a 6 años." Doctoral thesis, Universitat de Barcelona, 2005. http://hdl.handle.net/10803/2643.
Full textAbstract:
El tema de estudio desarrollado en esta tesis es la producción y uso de notaciones y su relación con el conocimiento de los estados mentales en niños de edad preescolar. La primera parte de la tesis se centra en el marco teórico sobre sistemas externos de representación y estados mentales. Los diferentes trabajos sobre los sistemas externos de representación han puesto de manifiesto la importancia que estos sistemas adquieren en los niños y el conocimiento que sobre ellos tienen mucho antes de que entren a la escuela. Por otra parte, las investigaciones sobre Teoría de la Mente sugieren el conocimiento por parte de los niños de los estados mentales en ellos mismos y en los demás a partir de los 4 años aproximadamente. Este conocimiento será determinante en sus relaciones interpersonales ya que les permitirá establecer una forma de comunicación con otros individuos en la que serán capaces de ponerse en el lugar de otra persona y darse cuenta, entre otras cosas, que adaptando un mensaje escrito al estado de conocimiento de otro individuo, podrán lograr que este lo descifre adecudamente.Los objetivos generales de la investigación son:
1. Analizar la relación entre la capacidad de producir notaciones funcionalmente comunicativa y la capacidad de diferenciar el estado mental propio y ajeno; y
2. Comparar la capacidad de producir notaciones comunicativas con la capacidad de emitir mensajes orales comunicativos, tanto en su formato de veracidad como de engaño.
Para lograr estos objetivos, en la segunda parte de la tesis realizamos dos estudios experimentales complementarios, de forma que en el primer estudio se ahondó en la relación entre la función comunicativa de las notaciones y la capacidad de atribución de estados mentales en 240 niñas y niños mexicanos de 3 a 6 años, divididos en dos grupos. Los resultados de este primer estudio sugieren que existe una relación entre la capacidad de diferenciar dos estados mentales (el propio y el ajeno), medida por el éxito en la prueba de la falsa creencia y la capacidad de producir notaciones funcionalmente comunicativas a partir de los 4;6 años. Sin embargo, aunque la capacidad de diferenciar estados mentales constituye una condición necesaria para que se puedan producir notaciones funcionales, no parece ser una condición suficiente. Parece que otras habilidades relacionadas con el conocimiento de los sistemas notacionales y con las habilidades pragmáticas de su uso, juegan un papel importante.
En el segundo estudio, el objetivo se centró en la investigación del efecto de los modos de comunicación en los mensajes producidos con la finalidad de comparar la producción y el uso de notaciones y los mensajes orales. Para ello, 270 niñas y niños mexicanos de 3 a 5 años de edad produjeron notaciones y emitieron mensajes bajo 2 condiciones: veracidad y engaño. Los resultados sugieren una mejora en ambos sistemas simbólicos relacionada con la edad, pero un ligero desfase evolutivo entre ambos modos de comunicación. Los niños más pequeños fueron mejores en sus mensajes orales a diferencia de los mayores que supieron adaptar la información de mejor manera en sus notaciones que en sus mensajes orales.
Finalmente, en el último capítulo de la tesis se discuten los resultados de los dos estudios experimentales y se mencionan las principales conclusiones extraídas de este trabajo.
The thesis focuses en the study of the production and use of notations and their relationship with the mental states knowledge in preschooler children. The first part of the thesis is the theoretical framework which suggests that children develop a great deal of knowledge about external representations before they are formally taught to read or write. In the other hand, research on theory of mind suggests the knowledge of mental states by 4 year old children. This knowledge is determinant in their relationships in the way that it will provide them not only the ability to communicate to others but to adapt a notational message in the way that other person could decode it effectively.
The second part of the thesis shows the results of the two experimental studies that were carried out with Mexican children (3-, 4-, 5-, 6- year-olds). In the first study, 240 children passed the false belief task and the notational task. Results showed a relationship between ones and other's mental states and the ability to produce communicative notations at 4;6 years old.
In the second study, 270 children (3-, 4-, 5 year-olds) not only produced a notation but communicated orally a message. Results suggested a developmental trend in both symbolic systems (oral/notational), but oral messages were better in 3 year old children while notations were more functional in 5 year old children.
Finally, in the last chapters of the thesis, we discuss the results and we mention the main conclusions.
29
Sharedeh, Diaa. "Analyse du transfert de matière et des modifications biochimiques et structurales du tissu musculaire lors du marinage, saumurage et malaxage des viandes." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22573/document.
Full textAbstract:
Le marinage et le saumurage améliorent la durée de conservation, la tendreté et la jutosité de la viande et du poisson. En complément, un malaxage ou « barattage » est souvent appliqué aux pièces de viande préalablement à la cuisson. Le but principal de cette étude était d’évaluer l’impact des conditions de traitement sur les modifications biochimiques et structurales du tissu musculaire ; une grande partie concerne le malaxage. Les essais relatifs au marinage ont permis de fixer le pH et la teneur en NaCl de petits échantillons de Semitendinosus de bœuf respectivement à 6,5, 5,4 ou 4,3 et à 0,9 ou 2 % en masse ; une ANOVA a révélé les effets de ces 2 paramètres sur la taille des cellules et des espaces extracellulaires, l’oxydation des lipides et des protéines et l’hydrophobie de surface de ces dernières. Un simulateur de saumurage-malaxage conçu par le laboratoire a permis d’imposer des successions de déformations contrôlées (nombre de 350 à 2500, taux de compression de 10 à 30%) à des muscles Semimembranosus (SM) ou Rectus femoris (RF) de porc. Des traitements mécaniques semblables à ceux existant dans des barattes industrielles de tailles différentes ont ainsi été reproduits. Les principales conclusions sont : (1) le malaxage augmente nettement la diffusivité apparente du NaCl, d’une part, en altérant la structure tissulaire (+ 20 %), et d’autre part, en induisant une convection s’ajoutant à la diffusion (+200 %) ; (2) le traitement mécanique entraine en lui-même une augmentation de la solubilité des protéines, connue pour moduler les qualités des viandes transformées, de 20 à 50% par rapport à des échantillons non malaxés, qu’ils soient salés ou non ; (3) il entraine aussi une augmentation modérée de l’hydrophobie des protéines ; (4) la dégradation de l’endomysium, servant d’indicateur des modifications structurales, est plus marquée au milieu qu’en périphérie du muscle malaxé et d’autant plus importante que le traitement mécanique est fort et longMarinating and brining improve shelf-life, tenderness and juiciness of meat and fish. As a supplement massaging or tumbling is often applied to meat pieces before cooking. The main aim of this study was to assess the impacts of the processing conditions on the biochemical and structural changes in the meat tissue; a great part is focused on massaging. In the marinating trials the pH and NaCl content of thin samples of beef Semimembranosus muscle were set at 6.5, 5.4 or 4.3 and at 0,9 or 2 % (w/w), respectively; an ANOVA have shown the effect of these two parameters on the cells and extra cellular space sizes, the oxidation of lipids and proteins and the protein surface hydrophobicity. A brining-massaging simulator built by the laboratory was used to apply controlled successions of deformations (number from 350 to 2500, compression ratio from 10 to 30 %) to Semimembranosus (SM) ou Rectus femoris (RF) pork muscles. Mechanical treatments similar to those existing in industrial tumblers of various diameters were so reproduced. The main conclusions are: (1) massaging clearly increases the NaCl apparent diffusivity, on the one hand, by a modifying the tissue structure (+20%) and, on the other hand, by adding convection to diffusion (+200%); (2) the mechanical treatment promotes by itself an increase in protein solubility, known to affect processed meat quality, from 20 to 50 % in comparison with salted or unsalted reference samples; (3) it also increases moderately protein hydrophobicity; (4) the endomysium degradation, used as an indicator of structural changes, was more pronounced in the muscle periphery than in the middle and all the more marked than massaging was strong and long
30
Basurto, Villafuerte Jean Paul Luis, and Hurtado Carlos Arturo Chirinos. "Estudio comparativo del efecto en el confort térmico de los pavimentos asfálticos y de concreto con diatomita en microclimas con ENVI-met." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/654023.
Full textAbstract:
El presente artículo evalúa de manera comparativa el confort térmico en el uso de los pavimentos asfalticos frente a los pavimentos de concreto con adición de diatomita. La variable que se considerará para el estudio será la reflectancia. Para la comparación se utilizará el software ENVI-met donde se modelará zonas de Lima identificadas como Islas de Calor (UHI) que usen pavimentos asfalticos las cuales, en el modelo, serán reemplazadas por pavimentos de concreto con adición de diatomita y se obtendrá el confort térmico de todos los modelos por el método PET a través del programa ya mencionado. Finalmente se comparará dichos resultados.This article comparatively evaluates the thermal comfort in the use of asphalt pavements versus concrete pavements with the addition of diatomite. The variable that will be considered for the study will be reflectance. For the comparison, the ENVI-met software will be used where areas of Lima that use asphalt pavements identified as Heat Islands (UHI) will be used, which will be replaced by concrete pavements with diatomite and thermal comfort will be seen by the PET method through of the aforementioned program. Finally, those results will be compared.
Trabajo de investigación
31
Bonnamy, Sylvie. "Caractérisation des produits pétroliers lors de la pyrolyse de leur fraction lourde : étude géochimique et structurale." Orléans, 1987. http://www.theses.fr/1987ORLE2027.
Full textAbstract:
La texture et la microtexture de precurseurs carbones de composition elementaire variee ont ete etudiees lors de la carbonisation depuis la nucleation, jusqu'a la coalescence et a la fin de la croissance des domaines orientes. Dans la 2**(e) partie, les relations roche-mere et petrole sont abordees par l'etude de la filiation kerogene-asphaltene de roche-asphaltenes d'huile. Dans la 3**(e) partie, on analyse l'influence de la biodegradation sur l'importance des domaines orientes des aspfhaltenes a partir d'une serie d'huile a biodegradation croissante. La degradation microtexturale s'accentue avec le pourcentage ou hydrocarbures aromatiques partant precocement au cours de la pyrolyse. Les asphaltenes sont affectes par les facteurs modifiant la matiere organique totale
32
Promeyrat, Aurélie. "Analyse et modélisation des mécanismes à l'origine des modifications des protéines lors du chauffage du tissu musculaire." Thesis, Clermont-Ferrand 2, 2013. http://www.theses.fr/2013CLF22333.
Full textAbstract:
L'amélioration de la qualité nutritionnelle des produits carnés cuits nécessite une meilleure compréhension des changements physicochimiques des protéines induits au chauffage. Ce travail porte sur l'analyse des mécanismes à l'origine des changements d'état des protéines afin de développer un modèle stoechio-cinétique de prédiction de l'effet de la composition et de la température sur ces changements. Un modèle expérimental, représentant l'environnement physicochimique du tissu musculaire (pH et force ionique), a permis de quantifier l'incidence spécifique de la chaleur, de la composition en fibres, en oxydants (fer, peroxyde d'hydrogène et vitamine C) et en antioxydants (enzymatiques, vitaminique et peptidique) sur l'oxydation, la dénaturation thermique et l'agrégation des protéines. Le modèle stoechio-cinétique est constitué de 43 réactions, représentant l'ensemble des phénomènes mis en jeu dans le modèle expérimental : chimie de Fenton, attaques radicalaires des acides aminés et dénaturation thermique. La résolution du système d'équations différentielles permet de calculer les concentrations des composés au cours du chauffage ; 3 constantes de vitesse inconnues ont été ajustées à partir des cinétiques expérimentales. Les résultats expérimentaux montrent : (1) un effet synergique des oxydants et du chauffage sur les oxydations, (2) une incidence négligeable des oxydants sur la dénaturation thermique et l'agrégation, (3) une sensibilité accrue des protéines de fibres α-white aux oxydations et à la dénaturation thermique par rapport à celles de fibres β-red et (4) un important effet de la nature des oxydants et des antioxydants sur les taux d'oxydation. Les prédictions du modèle stoechio-cinétique permettent de reproduire les tendances expérimentales. En partant de cette base, les modèles expérimentaux et mathématiques pourront être complexifiés progressivement pour avoir un outil prédictif de la qualité nutritionnelle des viandes cuitesImproving the nutritional quality of cooked meat products needs a better understanding of protein physicochemical changes induced by heating. This study aims to analyse the mechanisms responsible to protein state changes, in the goal to develop a predictive stoichio-kinetic model of effect of composition and temperature on these changes. An experimental model which represent the physicochemical environment of meat tissue (pH and ionic strength) allowed to quantify the specific effect of heating, composition in fibres, in oxidants (iron, hydrogen peroxide and vitamin C) and in antioxidants (enzymes, vitamins and peptides) on oxidations, thermal denaturation (hydrophobicity) and aggregation of proteins. The stoichio-kinetic model is composed of 43 reactions which represent all phenomenon involved in the experimental model : Fenton chemistry, radical attack on amino acids and thermal denaturation. A system of differential equation solver allows to determine the concentration of compounds during heating ; 3 unknown rate constants were adjusted with experimental kinetics. Experimental results show : (1) a synergistic effect of oxidants and heating on protein oxidation, (2) a negligible impact of oxidants on thermal denaturation and aggregation (3) a significant higher sensitivity to oxidation and thermal denaturation of protein from α-white than those from β-red, (4) an important effect of the composition in oxidants and antioxidants on the protein oxidation levels. Stoichio-kinetic model predictions reproduce experimental tendencies. From this base, experimental and stoichio-kinetic models could be progressively complexified to obtain a predictive tool of nutritional quality of meat
33
Delgado, Christophe Sidney. "L'Amélogénine, protéine majeure de l'émail dentaire : origine, analyses évolutive et phylogénétique chez les Amniotes et recherche de son expression lors de la formation des dents de Chalcides viridanus (Squamate,Scincidé)." Paris 7, 2002. http://www.theses.fr/2002PA077066.
Full text
34
Pascual, Payá Mónica. "Investigación sobre la mejora de la humectabilidad de films poliméricos de polietileno de baja densidad (LDPE) mediante plasma por descarga corona. Optimización de laminados con espumas de polietileno mediante procesos de laminación con adhesivos Hot-Melt para aplicaciones técnicas en el sector de automoción." Doctoral thesis, Universitat Politècnica de València, 2011. http://hdl.handle.net/10251/11297.
Full textAbstract:
En los últimos años, son numerosas las iniciativas de investigación dirigidas hacia la mejora de las propiedades adhesivas en materiales poliméricos. En el sector de automoción es muy importante que los films poliméricos puedan ser unidos entre sí a materiales de distinta naturaleza. El principal problema asociado al uso de estos materiales es que son substratos con baja energía superficial y precisan un tratamiento superficial para aumentar la mojabilidad de sus superficies y obtener unas buenas uniones adhesivas, un buen tintado y la aplicación de recubrimientos y lamiados duraderos. En el caso de la adhesión, el objetivo de los tratamientos superficiales es el incremento de la afinidad entre la superficie de los adherentes y la superficie de los adhesivos. De esta forma se logra optimizar el rendimiento de las uniones adhesivas para la obtención de substratos con buenas propiedades adhesivas, condición indispensable para conseguir laminados con aplicaciones técnicas.
En este trabajo se pretende mejorar la humectabilidad de los films poliméricos de LDPE a través del tratamiento de plasma por descarga de corona, para la obtención de laminados con espumas de polietileno mediante procesos de laminación con adhesivos "Hot-Melt" con aplicaciones técnicas para el sector de automoción. La mejora de la humectabilidad se ha evaluado a través del estudio de los ángulos de contacto con diferentes líquidos de medida en función de las potencias de trabajo utilizadas. La caracterización de la activación superficial como consecuencia del tratamiento se realiza a través de la espectroscopía infrarroja por transformada de Fourier con Reflectancia Total Atenuada (FTIR-ATR) y la espectroscopía fotoelectrónica de rayos X (XPS) que permiten identificar los fenómenos de funcionalización de la superficie. De forma paralela, se identifica y cuantifica el fenómeno de abrasión asociado a la agresividad del tratamiento sobre la superficie del film polimérico por medio de la microscopía electrónica de barrido (SEM) y la
microscopía de fuerza atómica (AFM). De forma complementaria se determina la
homogeneidad del tratamiento en función de la amplitud y del tiempo
(reproducibilidad). Además, las muestras tratadas con plasma se someten a un
proceso de envejecimiento para estimar la durabilidad del tratamiento.Pascual Payá, M. (2011). Investigación sobre la mejora de la humectabilidad de films poliméricos de polietileno de baja densidad (LDPE) mediante plasma por descarga corona. Optimización de laminados con espumas de polietileno mediante procesos de laminación con adhesivos Hot-Melt para aplicaciones técnicas en el sector de automoción [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/11297
Palancia
35
Pauwels, Hélène. "Etude theorique et experimentale du comportement des elements traces lors des processus d'interaction eau-roche." Paris 7, 1988. http://www.theses.fr/1988PA077136.
Full textAbstract:
Le modele de dissolution d'une solution solide est etendu aux mineraux silicates faisant intervenir des reactions acido-basiques. Ce modele permet une approche theorique du comportement des elements en traces lors des processus d'interaction eau-roche: la dissolution et la precipitation. L'evolution de la solution aqueuse jusqu'a l'etat stationnaire est decrite. Une liste des parametres fixant la concentration des elements traces est donnee. Leur comportement est etudie experimentalement et il est compare a celui des elements majeurs
36
Latorre, Moratalla Mariluz. "Aminogénesis y estrategias de control en productos cárnicos fermentados de elaboración artesanal." Doctoral thesis, Universitat de Barcelona, 2010. http://hdl.handle.net/10803/669224.
Full textAbstract:
Este trabajo de tesis aporta nuevos datos sobre los contenidos de aminas biógenas en productos cárnicos fermentados elaborados artesanalmente, los factores que puede influir en su formación y las mediadas de control que se pueden aplicar para reducir su acumulación durante la elaboración de estos embutidos.
Los contenidos totales de aminas biógenas de los embutidos fermentados artesanalmente y procedentes de diferentes países europeos fueron muy variables. La tiramina fue, en general, la amina mayoritaria, seguida de las diaminas putrescina y cadaverina. Los contenidos de histamina, feniletilamina y triptamina se encontraron sólo en un número muy reducido de muestras, y generalmente inferiores a los de tiramina y diaminas, tal como también se ha reportado para otros productos cárnicos fermentados.
El estudio de la capacidad aminoácido-descarboxilasa de los microorganismos aislados de dichos embutidos artesanales permitió la identificación de los posibles responsables de la acumulación de aminas biógenas en estos productos. Aunque la capacidad de descarboxilar ciertos aminoácidos es una propiedad cepa dependiente, la capacidad de producir ciertas aminas biógenas específicas estuvo fuertemente asociada a algunas especies concretas como Lactobacillus curvatus, L. brevis y Enterococcus faecium. Sin embargo, cepas aisladas de especies como L. plantarum, L. sakei y Staphylococcus xylosus serían las más adecuadas para ser utilizadas como parte de cultivos iniciadores autóctonos ya que no mostraron la capacidad de formar aminas en este tipo de productos.
Los resultados obtenidos a cerca de la influencia del tipo de elaboración (industrial versus artesanal) indican que el contenido total de aminas biógenas sería más elevado en productos cárnicos crudos-curados fermentados más ácidos (o de origen industrial) que en los poco ácidos (o artesanales). Además, las relativamente altas temperaturas y humedades relativas, a las que tiene lugar la fermentación en las elaboraciones de tipo industrial, así como los diámetros más anchos son parámetros importantes que pueden estimular la actividad aminogénica de los microorganismos presentes durante la elaboración de embutidos crudos-curados fermentados.
Finalmente, se evaluó la eficacia de diferentes medidas de control destinadas a la reducción de la aminogénesis en productos cárnicos fermentados artesanales, conservando al mismo tiempo las propiedades sensoriales típicas de estos productos. Con este fin, se plantearon estrategias de forma individual o combinada a nivel de higienización de materias primas, para reducir o eliminar la microbiota contaminante potencialmente aminogénica, cambios en la formulación que permitan modular el crecimiento y actividad de la microbiota presente durante la elaboración y la inoculación de cultivos iniciadores autóctonos con el fin de controlar la microbiota espontánea con una posible actividad aminogénica. Así, las altas presiones hidrostáticas como tratamiento higienizante de las materias primas se mostró como una medida efectiva ya que fue capaz de reducir los recuentos de enterobacterias, y consecuentemente de todas las aminas biógenas (putrescina y cadaverina) relacionadas con este tipo de microorganismos, sin alterar notablemente las propiedades sensoriales. Sin embargo este procedimiento higienizante parece no influir en la formación de tiramina. La formulación, en cuanto al tipo y concentración de azúcar, presentó un efecto reductor de la aminogénesis diferente dependiendo del tipo de producto y de proceso de elaboración específico. La inoculación del cultivo iniciador formado por cepas autóctonas aisladas de embutidos artesanales se mostró como la medida de protección más eficaz para evitar la acumulación de aminas biógenas durante la elaboración de este tipo de productos.
37
Galián, Jiménez Miguel. "Características de la canal y calidad de la carne, composición mineral y lipídica del cerdo Chato Murciano y su cruce con Ibérico. Efecto del sistema de manejo." Doctoral thesis, Universidad de Murcia, 2007. http://hdl.handle.net/10803/11060.
Full textAbstract:
El cerdo Chato Murciano (CH) es una raza en peligro de extinción. Se estudiaron parámetros de calidad de la canal y de la carne de esta raza autóctona de la Región de Murcia, cerdo CH, y sus cruces con cerdo Ibérico, bajo los sistemas de explotación intensivo y al aire libre. Para ello se diseñaron dos experiencias. Sobre los animales vivos y sus canales fueron tomadas las siguientes medidas: peso vivo, peso de la canal caliente y fría, rendimientos de canal, pérdidas por oreo, medidas morfométricas, pesos de piezas nobles y espesores de tocino dorsal. Adicionalmente, se realizaron una serie de determinaciones sobre parámetros de calidad de carne (sobre el músculo longísimo lumbar): pH y color, porcentaje de grasa intramuscular, pérdidas por goteo, pérdidas por cocción, resistencia al corte, composición mineral, y perfil de ácidos grasos en tocino y músculo.The Chato Murciano pig is an autochthonous pig breed from the Region of Murcia which is in danger of extinction. The objective of this thesis was the study of the quality parameters for the carcass and the meat of the Chato Murciano, and its cross with the Iberian pig, in both indoor and outdoor farming. Two studies were designed for this purpose. The methods used were those necessary to take the following measurements in live animals and carcasses: live weight, hot and cold carcass weight, carcass yields, storage weight losses, morphometric parameters, weight of most valuable meat cuts and dorsal fat thicknesses. In addition, taking the Longissimus lumbar muscle as our reference, we tested for the following meat quality parameters: pH and colour, intramuscular fat percentage, drip losses, cooking losses, shear force, mineral composition and fatty acid profile in muscle and backfat.
38
Beltrán, Martínez Roberto. "Estudios epidemiológicos y de patogenicidad de Monosporascus cannonballus Pollack et Uecker." Doctoral thesis, Universitat Politècnica de València, 2008. http://hdl.handle.net/10251/1865.
Full textAbstract:
El ascomiceto Monosporascus cannonballus Pollack et Uecker es uno de los principales hongos asociados al síndrome del "colapso", que afecta al cultivo de cucurbitáceas en España y otros países. Las ascosporas son el inóculo principal del hongo, quedando en el suelo tras la descomposición de las raíces afectadas, pudiendo ser extraídas del suelo mediante un proceso físico, que permite su cuantificación a lo largo del tiempo. Basándose en esta técnica, se han realizado varios estudios epidemiológicos que han permitido obtener resultados innovadores.
Se ha estudiado la dinámica poblacional de las ascosporas de M. cannonballus en suelos con diferentes condiciones hídricas y de cultivo. En campos con cultivo de melón, se ha observado que el nivel de ascosporas alcanza un máximo siete meses después de la plantación (3-4 meses después del final del cultivo), para ir disminuyendo después progresivamente, hasta llegar a niveles similares a los iniciales a los doce meses de la plantación. En campos con encharcamiento invernal, se ha observado un descenso progresivo del nivel de ascosporas, constatando que éstas pueden sobrevivir en suelo al menos por un periodo de tres años, sin haber perdido su infectividad. M. cannonballus ha sido considerado como un hongo termófilo, típico de zonas desérticas y semiáridas; en este estudio se ha demostrado que es capaz de sobrevivir en zonas templadas y en condiciones de encharcamiento.
Se ha realizado un estudio de cuantificación de ascosporas en suelo de campos de melón de varias zonas productoras de la Comunidad Valenciana, detectándose ascosporas de M. cannonballus en todos ellos. En el momento de aparición de síntomas de "colapso", se han observado diferencias significativas entre los campos y entre las zonas síntomáticas y asintomáticas, a favor de unas u otras, según los campos. Al comparar los niveles iniciales de ascosporas en suelo con los obtenidos dos o tres meses tras el final del cultivo, se han visto situaciones contradictoriBeltrán Martínez, R. (2006). Estudios epidemiológicos y de patogenicidad de Monosporascus cannonballus Pollack et Uecker [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/1865
Palancia
39
Talanda, Ivan. "Optimalizace technologie výroby odlitků ze slitin Al metodou vytavitelného modelu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230150.
Full textAbstract:
Aim of this diploma thesis is to choose new pattern wax for Fimes a.s. foundry. New wax should substitute old not fully satisfactory pattern wax which caused problems in technological process resulting in increased number of rejects. New pattern wax should eliminate current problems and help foundry with producing large, thin-walled, high-quality castings. Numbers of pattern waxes supplied by world’s leading wax manufacturers were subjected to laboratory tests and pilot study. This diploma thesis is part of project Alfa TA01010766: „Research and development of production technology large, thin and high quality castings of aluminium alloys “
40
Kemp, Anna Francina. "Die onontkombaarheid van die verlede." Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-02222010-172655.
Full text
41
Bockmann, K. L. "From Greenschist to Granulite: a mineral equilibria approach to melting and melt loss." Thesis, 2015. http://hdl.handle.net/2440/117961.
Full textAbstract:
This item is only available electronically.Melt loss during regional high-grade metamorphism has important consequences for interpreting the metamorphic evolution of the lower crust and for understanding processes leading to the chemical differentiation of the crust. However, melt loss typically modifies the protolith; making it difficult to reconstruct the conditions of prograde metamorphism and the extent to which melt loss modified the rock composition. The Reynolds Range in central Australia preserves a rare example where a single melt-prone stratigraphic unit can be traced from greenschist to granulite grade conditions. Using this as a natural laboratory, P–T mineral equilibria forward models have been calculated to explore melt loss and melt reintegration where both the protolith and the residuum compositions are preserved. Incremental melt loss modelling from the protolith composition along an isobaric heating path at 5 kbar shows that the residual granulite facies rock composition is consistent with around 18% melt loss from the protolith. Large-scale, one-step melt loss from a closed rock system that had built up 18% melt resulted in a similar residual composition to incremental melt loss. The fertility of the open (incremental) system and the closed system showed the closed system produced 5.4% more melt along a heating path from 700–800 °C. Determination of the concentrations of K–U–Th with increasing metamorphic grade shows that K and U concentrations decreased with increasing metamorphic grade. Conversely, Th concentrations increased, resulting in a slight overall increase in heat production from the protolith to the residuum, despite around 18% volume loss associated with melt extraction. An implication for this is that for melt prone rocks such as metapelites, melt loss during granulite facies metamorphism does not deplete the concentration of heat producing elements in the lower crust as is typically assumed.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2015
42
Morrissey, Laura Jane. "Characterising the P–T–t histories and effects of melt loss in high thermal gradient terranes." Thesis, 2016. http://hdl.handle.net/2440/106344.
Full textAbstract:
Zircon U–Pb and Lu–Hf isotopes, in situ U–Pb monazite geochronology and calculated metamorphic phase diagrams are used to explore the tectonic settings of regional high thermal gradient metamorphism as well as the consequences of melt loss on the bulk composition and reactivity of residual rock packages. Case studies are presented from four high thermal gradient terranes: the Windmill Islands in Wilkes Land, east Antarctica; the central Aileron Province in central Australia, the Rayner Complex in east Antarctica and the southern Gawler Craton in South Australia. The Windmill Islands region records two stages of high thermal gradient metamorphism between c. 1320–1300 Ma and c. 1240–1170 Ma. The first stage of metamorphism occurred at conditions of 3.5–4 kbar and 700–730 ºC and was associated with the formation of a horizontal fabric. The second stage of metamorphism is most strongly recorded in the southern Windmill Islands where it reached conditions of ~4 kbar and 850 ºC, coincident with the emplacement of voluminous isotopically juvenile granitic and charnockitic magmas. The metasedimentary rocks of the Windmill Islands contain both arc- and craton-derived detrital zircon grains, suggesting that they formed in a back-arc setting. An extensional setting is consistent with the high thermal gradients and the formation of a regional horizontal fabric during the first stage of metamorphism. The intrusion of juvenile charnockite further suggests that the overall tectonic regime was extensional and that the crust beneath the Windmill Islands contained little evolved material. The central Aileron Province records long-lived high thermal gradient anatectic conditions between c. 1590 and 1520 Ma. Peak temperatures were in excess of 850 ºC with pressures of 6.5–7.5 kbar, corresponding to a thermal gradient of >130–140 ºC/kbar. The retrograde evolution involved minor decompression and then slow cooling, culminating with the development of andalusite. The absence of any syn-metamorphic magmatism and the development of contractional structures during metamorphism suggest that long-lived high thermal gradient metamorphism was likely to have been driven to a significant extent by the burial of high heat producing pre-metamorphic granitic rocks that volumetrically dominate the terrane. The Rayner Complex in east Antarctica was extensively deformed and metamorphosed during the Rayner Orogeny between c. 1020 and 900 Ma. Metamorphism was associated with voluminous granitic and charnockitic magmatism. The earliest phase of metamorphism is recorded in the southern Rayner Complex and involved pressures of >7.5 kbar. Pervasive metamorphism at 950–900 Ma affected the whole Rayner Complex and involved temperatures of 850–880 °C and lower pressures of 6–7 kbar. The Rayner Complex is interpreted to be a back-arc basin that was closed during two-stage collision between the Archean Antarctic cratons to the south and the arc, followed by collision with the Indian Craton. High thermal gradient metamorphism can occur in both collisional and extensional regimes and in both plate margins and intracontinental settings. The primary thermal driver in the Windmill Islands and the Rayner Complex was likely to have been the thinned lithosphere resulting from back-arc extension, whereas in the central Aileron Province, the primary thermal driver was likely to be anomalously high heat producing crust. However, in all three terranes, the attainment of regional high temperatures was facilitated by the preconditioning (dehydration) of the crust by prior melt loss events and slow erosion rates. In all four studied terranes, high thermal gradient metamorphism resulted in melt loss that significantly altered the compositions and reactivity of the residual rocks. One implication of melt loss during regional high temperature metamorphism is that it creates a terrane comprising anhydrous, residual rock compositions that are relatively resistant to reworking during subsequent metamorphic events. As demonstration of this, the Rayner Complex records a metamorphic event at c. 540–500 Ma that reached peak conditions of 800–870 °C and 5.5–6.5 kbar. However, high-T mineral growth at 540–500 Ma is only recorded in some locations. The spatial distribution of this mineralogical reworking was controlled by localised rock reactivity that may reflect domains that had undergone hydrous retrogression at the end of the Rayner Orogeny, locally enhancing the responsiveness of the rock mass during the Cambrian.
In the southern Gawler Craton, forward modelling of an Fe-rich phyllite sequence shows that melt loss can also have economic implications by increasing the concentration of iron in the residual rock package, leading to enrichment in Fe-oxide minerals (magnetite and hematite). Muscovite-rich rocks with lower iron content are more fertile, produce more melt and therefore show a more significant increase (up to 35%) in the Fe-oxide content in the residual (melt depleted) rock package. Rocks with primary Fe-rich compositions are less fertile, lose less melt and therefore do not experience the same relative increase in the amount of Fe-oxides in the residuum. The economic implications of the modelling are that the more fertile horizons with lower primary iron contents may be significantly upgraded as a result of melt loss, thereby improving the overall grade of the ore system. In the case of southern Gawler Craton, melt loss-driven Fe enrichment has contributed to the formation of one of Australia’s largest known magnetite resource systems.Thesis (Ph.D.) (Research by Publication) -- University of Adelaide,School of Physical Sciences, 2016.
43
Engelbrecht, Elizabeth Maria. "Die ontwikkeling van sosiale verhoudings van adolessente met ernstige gehoorverlies met hulle normaalhorende portuurgroep (Afrikaans)." Diss., 2008. http://hdl.handle.net/2263/27905.
Full textAbstract:
Die hoofdoelstelling van die navorsing was om die ontwikkelende sosialisering van adolessente met ernstige gehoorverlies met hul normaalhorende portuur te begryp en te beskryf. Die navorsingsvraag was, Hoe ontwikkel die adolessent met ernstige gehoorverlies sosiale verhoudings met sy/haar normaal horende portuurgroep? ‘n Ondersoek na vier adolessente met ernstige gehoorverlies is gedoen, om hul interaksiesituasie met hul horende portuurgroep beter te begryp. Die studie het ‘n meervoudige gevallestudie-ontwerp gevolg vanuit die postmoderne interpretiwistiese perspektief. Bronfenbrenner se bio-ekologiese sisteemteorie is benut as die teoretiese basis vir die studie, ten einde die totale konteks van die adolessent met gehoorverlies te begryp. Die deelnemers is volgens die maksimum variasiebeginsel gekies en die data is met behulp van kwalitatiewe metodes, naamlik observasies en onderhoude, ingesamel. Die analiseproses het uit gerigte tematiese analise en analitiese vergelyking bestaan. Die resultate het getoon dat interaksie tussen adolessente met gehoorverlies en hul normaal horende portuur suksesvol kan geskied, maar dat dit met bepaalde hindernisse (soos oningeligtheid en onsekerheid omtrent die gehoorverlies) gepaard gaan en van beide partye word aanpassings geverg. Individuele bates van die adolessent met gehoorverlies moet ook benut word en uitgebou word om die minder sterk punte te ondersteun. Die adolessent met gehoorverlies se spraak (artikulasie) en spraakleesvermoë is van kernbelang ten einde deur die horende gemeenskap verstaan te word, asook om hulle te verstaan. Gereelde deurlopende blootstelling aan die horende gemeenskap wat deur die ouers gefasiliteer word, blyk die sleutel te wees tot suksesvolle interaksie en integrasie in die breë gemeenskap. ENGLISH ABSTRACT: The main purpose of the study was to understand and describe the developing socialization of adolescents with severe hearing loss with their normally hearing peers. The central research question was, How does the adolescent with severe hearing loss develop social relationships with his/her normally hearing peers? The research was conducted with four adolescents with severe hearing loss, better to understand their interactive situation with their normally hearing peers. The research took the form of a multiple case study design, conducted from the postmodern interpretive perspective. Bronfenbrenner’s bio-ecological systems theory formed the theoretical basis of the study, to understand the full context of the adolescent with hearing loss. Participants were selected in accordance with the maximum variation sampling principle. Data were collected by qualitative methods, namely observations and interviews. The data analysis consisted of focussed thematic analysis and analytical comparison. The results showed that interaction between adolescents with hearing loss and their normally hearing peers can be successful, but it is accompanied by certain challenges such as a lack of information and uncertainty about the hearing loss and adaptations are required from both parties. The individual assets of die adolescent with hearing loss should be utilised and developed to support the weaker characteristics. The speech- and speech reading skills of the adolescent with hearing loss are of the utmost importance to be understood by the hearing community as well as to understand them. Continual exposure to the hearing community, facilitated by the parents, appears to be key to the successful interaction and integration into the broader community.Dissertation (MEd)--University of Pretoria, 2008.
Educational Psychology
unrestricted
44
Kaltenbrünn, Inge Johanna. "Intensionele kommunikasie-ontwikkeling van jong kinders met kogleêre inplantings (Afrikaans)." Diss., 2005. http://hdl.handle.net/2263/22926.
Full textAbstract:
This research describes the development of communicative intention of young children with cochlear implants in order to study the relationship between the early communicative intention of these children and their later verbal communication. Five children under the age of three years with cochlear implants were selected from the records of the University of Stellenbosch, Tygerberg Academic Hospital’s Cochlear Implant Unit, Cape Town as subjects. Video recordings of each of the five subjects in unstructured free play interaction with their caregivers, before cochlear implantation and each six months after cochlear implantation over a period of two years were used to identify the development of their communicative intention. The Communicative Intention Inventory (Coggins&Carpenter, 1981) was used to classify the communicative behaviour of the subjects according to the types of communication functions that were used, as well as the way in which they expressed the functions of communication. Results of the study show that the development course of the functions of communication that the subjects used over a two-year period, were consistent with the development patterns found in younger children with normal hearing. There was however marked individual differences between the subjects during the transition from nonverbal to dominantly verbal ways of communication as far as the rate of development of verbal communication was concerned. A strong relationship was found among the five subjects regarding the use of the nonverbal communication functions, request for object or action and protest before cochlear implantation and their total verbal communication two years after cochlear implantation, which could account for these individual differences in the rate of verbal communication development after cochlear implantation. Indications for clinical application and future research were identified on the basis of these conclusions. The data collected during the research is seen as meaningful in clinical decision-making regarding the suitability of young children under the age of three years with a profound hearing loss for cochlear implantation and their therapeutic management.Dissertation (M (Communication Pathology))--University of Pretoria, 2006.
Speech-Language Pathology and Audiology
Unrestricted
45
Welgemoed, Gisela Ingrid. "Benutting van projeksietegnieke binne gestatspelterapie met die kind wat verlies ervaar." Diss., 2009. http://hdl.handle.net/10500/3516.
Full text
46
Mu, Jianhong. "An Integrated Study of Avian Influenza Impacts and Associated Climate Change Issues." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10949.
Full textAbstract:
This dissertation examines issues related to avian influenza (AI) disease. This is done via three essays that individually examine: (1) the impacts of climate change on the probability and expected numbers of AI outbreaks and associated economic loss; (2) the effects that media coverage of AI outbreaks has on meat demand in the United States, and (3) the potential effectiveness of AI mitigation strategies on poultry production and welfare under a simulated AI outbreak in United States.
The climate change and spread of AI outbreaks study finds that the probability and expected number of AI outbreaks increases as climate change proceeds. Particularly, past climate change has contributed to the current spread of AI disease by 11% and the future climate change will increase this spread by another 12%. Moreover, the underreporting probability of AI outbreaks is also examined and results show that the underreporting probability is much higher in countries with lower gross domestic production level, larger export of poultry products and more numbers of AI confirmed human deaths. Therefore, disease prevention and control plans should focus on these economically poor and climatically changed regions.
AI outbreak information has significant effects on meat demand in the United States. In particular, impacts of overseas AI human deaths on meat demand equal 0.02% for beef, -0.005% for pork, and -0.01% for chicken for sample when there was no AI occurred in the United States, while it has smaller impacts on meat expenditure when using the whole sample. In addition, human deaths due to AI disease will increase beef demand and decrease that for pork and chicken. However, AI media coverage in short-run has insignificant effect on meat demand, which suggests that consumers are more cautious when cases occur within the United States as opposed to international cases.
In the study on the effects and welfare implications of AI mitigation strategies, results find that vaccination strategy is welfare decreasing under most cases of demand shocks but is desirable in some regions when both domestic and excess demand decrease. Under the assumption of one AI outbreak in the United States, the associated mitigation costs because of past climate change are relatively small.
47
Gardiner, Elizabeth. "Narratiewe pastorale terapie met broodwinners tydens 'n rasionaliseringsproses." Diss., 1999. http://hdl.handle.net/10500/16828.
Full textAbstract:
Text in AfrikaansHierdie navorsing is gerig op die aanwending van narratiewe pastorale terapie met breadwinners wat werksonsekerheid tydens 'n rasionaliseringsproses ervaar. Die studie is kwalitatief van aard en is gebaseer op narratiewe pastorale gesprekvoerlng esook die proses van meervoudige refleksie waardeur die navorsing gerig en aangepas word. As navorser was ek deelnemer in die proses van verandering waarin veralgemening genegeer is en die rol van persoonlike kennis beklemtoon is. Die terapie is gerig op proaktiewe optrede tydens die rasionaliseringsproses en is ten opsigte van elkeen van die deelnemers aangewend in pasmaakgesprekke waartydens hul unieke behoefles aandag geniet het. Deur die metode van eksternalisering is die invloed van werksonsekerheid op die deelnemers geeksploreer en is hulie aangemoedig om in 'n ander verhouding tot die probleem van werksonsekerheid le staan. Namate die deelnemers tydens hierdie proses belangrike skuiwe op die vlak van identiteit gemaak het, ken hulie die toekoms met nuwe hoop bejeen.
The research was directed at the application of narrative pastoral therapy with breadwinners experiencing job insecurity during a process of rationalisation. This qualitative study was based on narrative pastoral conversations as well as the process of multiple reflection through which the research was directed and adapted. As researcher, I was a participant in the process of change in which generalisations were negated and the role of personal knowledge emphasised. The therapy was directed at proactive action during the rationalisation process and was applied in respect of each of the participants in a customised conversation. The influence of job insecurity on the participants was explored through the method of externalisation and they were encouraged to adopt a new relationship to the problem of job insecurity. In the process, as each participant made important shifts on the level of identity, they wera able to view the future with new hope.
Philosophy, Practical & Systematic Theology
M. Th. (Praktiese Teologie (Pastorale Terapie))
48
KOSTOHRYZOVÁ, Lenka. "Ztráty při zrání a skladování hovězího masa." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-154554.
Full textAbstract:
The thesis is focused on the preparation of the preview issue of aging beef, the required length of storage, conditions and mass losses during the storage period. In the theoretical part there are described the chemical composition, intravital affect on the quality, impact and post-mortem storage of beef in more details, as stated in the literature. The practical part deals with weight loss within slaughter halves during the ripening process, the conditions and the required length for curing meat. The slaughtered animals were beef breeds, particularly Charolay, Aberdeen Angus, Limousine and Galloway.
49
Benassi, Bianca Jane. "The impact of high protein-high red meat vs high carbohydrate weight loss diets on genome stability and biomarkers of colorectal cancer risk in overweight men." 2008. http://hdl.handle.net/2440/58694.
Full textAbstract:
It has been suggested that high protein diets are associated with an increased risk of colorectal cancer due to the higher content of red meat. However, the study of the overall dietary and lifestyle pattern may prove more important than any individual component when assessing colorectal cancer risk. From this, it is proposed that a dietary pattern used for weight loss that is higher in protein but remains low in fat and high in foods rich in fibre and micronutrients that are required for genome stability may not increase the risk of colorectal cancer, thus providing a safe and effective dietary method of weight loss in overweight subjects. This thesis describes the development of a novel in vitro faecal water genotoxicity test using the cytokinesis-block micronucleus (CBMN) cytome assay in the WIL2-NS cell line. This thesis then investigates faecal water genotoxicity and peripheral blood lymphocyte genome stability in overweight men following a weight loss dietary pattern either high in protein, specifically red meat, or high in carbohydrate. Results from this thesis indicate that the genotoxic potential of faecal water can be successfully assessed in vitro using the CBMN cytome assay. A high protein-high red meat weight loss diet did not increase faecal water genotoxicity or peripheral blood lymphocyte DNA damage, measured with the CBMN cytome assay, differently to a high carbohydrate weight loss diet. Faecal water genotoxicity data suggests weight loss and/or caloric restriction following either a high protein or high carbohydrate diet may beneficially modify the carcinogenic load of the colon in the short term, however this needs to be validated in a study that includes a non-weight loss control group. A lack of relationship was seen between faecal water genotoxicity and genome damage in lymphocytes which may suggest that the assessment of both the genome damage potential of the bowel contents and the assessment of the genome stability profile of peripheral blood lymphocytes may be important in comprehensively assessing the impact on genome damage by different dietary patterns.http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1316889
Thesis (Ph.D.) -- University of Adelaide, School of Molecular and Biomedical Science, 2008
50
Venter, Anna Catharina. "Aankooprisikobestuur met spesifieke fokus op die identifisering en voorkoming van bedrog : `n raamwerk vir die risikobestuurder en interne ouditeur." Diss., 2005. http://hdl.handle.net/10500/1560.
Full textAbstract:
The occurence of procurement fraud requires from the management of the enterprise, the risk manager of the enterprise as well as the internal auditor to effectively address procurement fraud risks within the enterprise risk management concept.
The purpose of the study is to set a procurement fraud risk management process in place which will serve as a comprehensive framework for the enterprise risk manager as well as the internal auditor to limit the enterprise's exposure to procurement fraud risks as far as possible.
The study firstly focus on the analysis of the steps within the procurement process which is the starting point for the identification of the fraud risks. Secondly the enterprise risk management model is applied in the format of a procurement risk matrix within the procurement function.
The study is an indication that procurement fraud cannot be completely prevented but that the appearance thereof can be limited by means of the extensive procurement fraud risk management model.
Recommendations for future studies include the application of the enterprise risk management model in other functional areas within the enterprise.Die voorkoms van aankoopbedrog vereis van die onderneming se bestuur, ondernemingsrisikobestuurder en interne ouditeur om aankoopbedrogrisiko's effektief binne die konteks van die ondernemingsrisikobestuurskonsep aan te spreek. Die doel van die studie is om `n aankoopbedrogrisikobestuursproses daar te stel wat as `n omvattende raamwerk vir die ondernemingsrisikobestuurder en interne ouditeur kan dien om die onderneming se blootstelling aan aankoopbedrogrisiko's so ver as moontlik te beperk. Die studie fokus eerstens op die ontleding van die stappe in die aankoopproses wat as vertrekpunt vir die identifisering van bedrogrisiko's dien. Tweedens word die ondernemingsrisikobestuursmodel in die vorm van `n aankoopbedrogrisikomatriks in die aankoopfunksie toegepas. Die studie dui daarop dat alhoewel aankoopbedrog nie volkome verhoed kan word nie, die voorkoms daarvan wel beperk kan word deur die toepassing van `n omvattende aankoopbedrogrisikobestuursmodel. Aanbevelings vir verdere studies sluit die toepassing van die ondernemingsrisikobestuursmodel op ander funksionele terreine van die onderneming in.
Auditing
M. Com. (Auditing)