Academic literature on the topic 'Tufts (Firm)'
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Journal articles on the topic "Tufts (Firm)"
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Trivinho-Strixino, Susana, and Maria Conceição Messias. "A new species of Oukuriella Epler, 1986 (Insecta, Diptera, Chironomidae, Chironominae) from São Paulo State , Brazil." Entomología y Vectores 12, no. 2 (June 2005): 283–91. http://dx.doi.org/10.1590/s0328-03812005000200012.
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The immature and adult stages of a new species of the genus Oukuriella Epler, 1986 from the Southeast of Brazil are described. The larvae, reared in laboratory to obtain adults, were obtained from submerged wood collected in a reservoir situated in the Jataí Ecological Station (Luiz Antônio, SP). According to Messias et al. (2000) the genus is composed of three species group. The adults of this new species congregate morphological characteristics of the Oukuriella - second group, which is characterised by wings without markings, abdominal tergites with setal tufts and gonostylus broad, 1,5x longer than gonocoxite, but is distinguished by different thoracic and abdominal pigmentation. This is the first description of female for the Oukuriella second group. The immature forms aggregate the same characteristics of O. intermedia, the one species whose pupae and larvae are known. The strongly hardly mental and mandibular teeth sees to indicate the ability to scrape and to shred firm surface as submerged wood, substrate where were collected.
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Mergl, Michal, Jaroslav Kraft, and Petr Kraft. "Life habit and spatial distribution of siphonotretid brachiopods in the Lower Ordovician of the Prague Basin, Czech Republic." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 98, no. 3-4 (September 2007): 253–61. http://dx.doi.org/10.1017/s1755691007079856.
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ABSTRACTSiphonotretid brachiopod distribution in the Lower Ordovician of the Prague Basin is described and discussed; the new species Alichovia cometa is established. The preservation and distribution of the group indicate a preference for shallow-water offshore, high-energy environments: siphonotretids are abundant shelly fossils in the shallower-water, mostly marginal sites of the basin but are absent in the deeper parts. Their environmental limits were complementary to those of the graptolites; siphonotretids co-occur with epiplanktonic graptolites at only a few localities. Deeper offshore deposits with biramose dichograptids and diverse, generally delicate benthic dendroids lack siphonotretids. Indeed, siphonotretids were intolerant to dysoxia and preferred a well-aerated siliciclastic, firm sea floor in the shallower parts of the basin. They were tolerant to suspended coarser detritus, using their spines which functioned as an effective sieve. The density and ramification of spines indicate three sifting strategies. Suggested life styles above the seabed on elevated surfaces (algae, sponges, dendroids) are not supported by direct evidence. They more likely lived within more supple and soft matrices (sponges, tufts of algae) stabilised by their spines, with the spinose basket maintaining free space for inhalant and exhalant currents.
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Lewthwaite, S. L., and P. J. Wright. "Diseases of the kumara crop." New Zealand Plant Protection 62 (August 1, 2009): 402. http://dx.doi.org/10.30843/nzpp.2009.62.4845.
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The predominant diseases of the commercial kumara (Ipomoea batatas) or sweetpotato crop are caused by fungal pathogens The field disease pink rot results from infection by the fungus Sclerotinia sclerotiorum Lesions form on vines but may spread down stems to the roots The widespread nature of this disease in sweetpotato appears peculiar to New Zealand Scurf is a disease caused by Monilochaetes infuscans which occurs in the field but may proliferate amongst stored roots The disease causes a superficial discolouration of the root surface which is mainly cosmetic but can also increase root water loss in storage Infection by Ceratocystis fimbriata produces a disease known as black rot The disease can be transmitted amongst plants at propagation but is particularly rampant amongst roots in storage This disease is readily transmitted and can cause severe economic loss Fusarium oxysporum causes surface rots in stored roots characterised by light to dark brown lesions that tend to be firm dry and superficial The lesions may be circular and centred on wounds caused by insects or mechanical damage at harvest Soft rot caused by Rhizopus stolonifer generally occurs in roots after they are washed and prepared for the market Fungal infection occurs through wounds or bruised tissue producing distinctive tufts of white fungal strands and black spores
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McGregor, Glenn B., and Barbara C. Sendall. "Ewamiania thermalis gen. et sp. nov. (Cyanobacteria, Scytonemataceae), a new cyanobacterium from Talaroo thermal springs, north-eastern Australia." Australian Systematic Botany 30, no. 1 (2017): 38. http://dx.doi.org/10.1071/sb16039.
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A new subaerophytic cyanobacterium, Ewamiania thermalis gen. et sp. nov., was isolated from a thermal spring complex in tropical, north-eastern Australia and characterised using combined morphological and phylogenetic attributes. It formed blackish-green hemispherical caespitose mats that began as small circular tufts, maturing to form dense mats up to several metres long. It grew along the crests of the minidams just above the thermal waters as well as along some of the shallow unconfined areas of vent-discharge aprons. Morphologically, Ewamiania is most similar to members of the Scytonemataceae. Filaments were isopolar, cylindrical, straight or flexuous, densely arranged and erect, often parallely fasciculate, with tolypotrichoid false-branching, rarely with scytonematoid false-branching. Vegetative cells were short barrel-shaped or isodiametric, slightly constricted at the cross-walls, with granulated contents. Sheaths were firm, thick, lamellated, uncoloured to yellowish or darkly yellow–brown in colour, cylindrical and closed at the apex. Heterocytes were spherical or ovoid in shape, and occurred in both basal and intercalary positions, generally solitary, but sometimes up to two or three in a series, developing particularly at the base of branches. Reproduction occurred by the production of hormogonia by the formation of necridic cells; hormogonia were not constricted at cross-walls and often included terminal heterocytes. Phylogenetic analyses using partial 16S rRNA sequences obtained from a strain of E. thermalis showed that it formed a well supported monophyletic clade, sharing less than 94.3% nucleotide similarity with other cyanobacterial sequences, including putatively related taxa within the Scytonemataceae. It also formed a novel clade in the nifH phylogeny, which was associated with members of the genus Brasilonema M.F.Fiore, Sant’Anna, M.T.P.Azevedo, Komárek, Kastovsky, Sulek & Lorenzi.
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Poletaev, N. L. "About Fire Spread by Poplar Seed Tufts." Пожаровзрывобезопасность 19, no. 6 (December 2010): 4–13. http://dx.doi.org/10.18322/pvb.2010.19.06.4-13.
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Tse, K., Y. Peña, K. Arntsen, S. C. Bae, L. Bloch, I. N. Bruce, K. Costenbader, et al. "AB1338-HPR GLOBAL PATIENT PERSPECTIVE ON TOP CHALLENGES IN LUPUS CARE AND RESEARCH PARTICIPATION." Annals of the Rheumatic Diseases 79, Suppl 1 (June 2020): 1957.1–1957. http://dx.doi.org/10.1136/annrheumdis-2020-eular.2871.
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Background:The Addressing Lupus Pillars for Health Advancement (ALPHA) Project is a global consensus initiative to identify, prioritize and address top barriers in lupus drug development, clinical care and access to care. The Lupus Foundation of America convenes ALPHA with Tufts Center for the Study of Drug Development and a Global Advisory Committee of lupus experts representing clinician-scientists, industry and patients.Objectives:Collect global patient input to determine alignment with the lupus clinician-scientist community on prior published consensus of top lupus barriers.Methods:A 23-question online Qualtrics survey was developed to identify challenges across lupus diagnosis, clinical care and research participation. The survey, available in English, Spanish, Korean and simplified Chinese, was fielded in November 2019 to people with lupus and caregivers of children <18 with lupus. SPSS 26 and SAS 9.4 were used for descriptive statistics and sub-analysis.Results:Analysis included only consented responses with ≥ 68% survey completion (n=3,447) received across 83 countries. 95% were female with a mean age of 45. Respondents reported being White (57%), Black or of African descent (14%), Hispanic or Latino (18%) and Asian (10%). 65% resided in the US while 35% resided in countries outside of the US. 97% were people with lupus while 3% were caregivers to children <18 with lupus.Highest ranked challenges were similar globally and across children and adults: medication side effects, lack of treatment options and high out-of-pocket costs. Managing side effects ranked significantly higher (p<.05) outside of the US (48%) compared to US (40%). 50% of caregivers reported managing side effects as the top challenge for children compared to 43% of adults (p<.05). Research participation was low (24%) and lower among children (16%). The top reason for not participating in a clinical trial was not being asked by their doctor.Conclusion:This global survey revealed that medication side effects and lack of effective treatments are top challenges for people with lupus, including children. Most respondents were never asked by their doctors to participate in a clinical trial, which may explain difficulties in trial recruitment. These barriers are consistent with prior published barriers identified by the clinician-scientist community.Acknowledgments:ALPHA sponsors: EMD Serono, GSK, Aurinia, MallinckrodtDisclosure of Interests:Karin Tse: None declared, Yaritza Peña: None declared, Kathleen Arntsen: None declared, Sang-Cheol Bae: None declared, Lauren Bloch Consultant of: Faegre Drinker Consulting is a division of Faegre Drinker Biddle & Reath, a law and consulting firm that represents patient advocacy organizations and sponsors developing drugs, Ian N. Bruce Grant/research support from: Genzyme Sanofi, GSK, and UCB, Consultant of: Eli Lilly, AstraZeneca, UCB, Iltoo, and Merck Serono, Speakers bureau: UCB, Karen Costenbader Grant/research support from: Merck, Consultant of: Astra-Zeneca, Bradley Dickerson Employee of: Aurinia, Thomas Dörner Grant/research support from: Janssen, Novartis, Roche, UCB, Consultant of: Abbvie, Celgene, Eli Lilly, Roche, Janssen, EMD, Speakers bureau: Eli Lilly, Roche, Samsung, Janssen, Kenneth Getz: None declared, Amy Kao Employee of: EMD Serono, Susan Manzi: None declared, Eric F. Morand Grant/research support from: AstraZeneca, Consultant of: AstraZeneca, Speakers bureau: AstraZeneca, Sandra Raymond: None declared, Brad H Rovin Grant/research support from: GSK, Consultant of: GSK, Laura Schanberg Grant/research support from: Sobi, BMS, Consultant of: Aurinia, UCB, Sanofi, Victoria Werth Grant/research support from: Biogen, Celgene, Gilead, Janssen, Viela, Consultant of: Biogen, Gilead, Janssen, Abbvie, GSK, Resolve, AstraZeneca, Amgen, Eli Lilly, EMD Serono, BMS, Viela, Kyowa Kirin, Joan Von Feldt Shareholder of: GSK, Employee of: GSK, David Zook Consultant of: Faegre Drinker Consulting is a division of Faegre Drinker Biddle & Reath, a law and consulting firm that represents patient advocacy organizations and sponsors developing drugs, Leslie Hanrahan: None declared
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Marzdashti, S., and S. Joncas. "The effect of laminate sequences on tuft bridging in GFRP laminates under tensile loading." IOP Conference Series: Materials Science and Engineering 1266, no. 1 (January 1, 2023): 012010. http://dx.doi.org/10.1088/1757-899x/1266/1/012010.
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Abstract This conference paper reports the tuft bridging behaviour of a single tuft when used in an orthotropic or a quasi-isotropic laminate. Laminates are subjected to pull-out experiments with a full release film placed in the mid-layer of laminates. The force-separation diagrams and damaged samples obtained by tensile tests are analysed to compare two different laminate. The results show that the larger amount of resin present around the tuft in orthotropic laminate reduces by 60% the ultimate tensile strength of the tuft when compared to quasi-isotropic laminates. The tuft tends to fail in the mid-layer of quasi-isotropic laminate with no pull-out, while the tuft has a bit pulling out in orthotropic laminate, causing an increase in the fracture energy.
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Doucet, P., W. Mueller, and F. Chartrand. "Archean, deep-marine, volcanic eruptive products associated with the Coniagas massive sulfide deposit, Quebec, Canada." Canadian Journal of Earth Sciences 31, no. 10 (October 1, 1994): 1569–84. http://dx.doi.org/10.1139/e94-139.
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The mafic-dominated volcanic and related volcaniclastic sedimentary rocks, which host the Archean Coniagas Zn–Pb–Ag massive sulfide deposit, are inferred to be the result of submarine explosive and effusive eruptions at depths of approximately 1000 m, as suggested by the presence of volcaniclastic turbidites, the absence of wave-induced sedimentary structures, pillowed lava flows, the sulfide deposit itself, and the incipient arc setting. The rock assemblage includes massive, pillowed and brecciated, basaltic to andesitic flows, massive, andesitic to rhyodacitic lapilli tuffs, andesitic stratified lapilli tuffs, and bedded tuffs. Preserved fragments and delicate volcanic textures, such as angularity of clasts, chilled clast margins, and clast vesicularity, and sedimentary structures are consistent with a subaqueous hydroclastic origin for the volcaniclastic sedimentary rocks. Explosive degasification of magma and (or) lava, in conjunction with fragmentation due to the interaction of magma–water, or nonexplosive hydroclastic fragmentation can account for the observed characteristics in the volcaniclastic deposits.The 280 m thick Coniagas volcano-sedimentary succession, used to reconstruct the volcanic history of the deposit, records two explosive–effusive volcanic cycles. The initial stage of each cycle is envisaged to have commenced with a small fire fountain or boiling-over eruption. Transport and deposition of the fragmented debris along the flanks of the volcanic edifice is attributed to high-concentration particulate gravity flows. The massive lapilli tuffs are interpreted as laminar debris flows, whereas the stratified lapilli tuffs may reflect turbulent flow deposits. The bedded tuffs were produced during the waning eruptive stages or elutriated from high-concentration syneruption flows. Ingestion of water, causing hydroclastic fragmentation, occurred during the eruptive and (or) the transport process. Calm, effusive mafic volcanism, characterized by massive, pillowed and brecciated flows and reworked counterparts, terminates each volcanic cycle. The massive, felsic lapilli tuffs, which host the mineralization, are inferred to represent locally reworked hydroclastic products of explosive or nonexplosive origin. The Coniagas mine deposit may serve as a guide for future exploration of small Archean volcanic-hosted massive sulfide deposits with a restricted alteration halo.
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Huamantupa-Chuquimaco, Isau, Haroldo C. De Lima, and Domingos B. O. S. Cardoso. "Tachigali inca (Caesalpinioideae – Leguminosae), a new species of giant tree from Amazonian forests." Webbia 75, no. 2 (November 18, 2020): 243–50. http://dx.doi.org/10.36253/jopt-9604.
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The new species Tachigali inca is described and illustrated. It grows in lowland ‘terra firme’ forest of Amazonian Brazil, in the sub-Andean Amazon region of Peru, and in northeastern Bolivia. The species differs markedly from its most closely related species (T. amarumayu, T. prancei and T. setifera, all belonging to the “setifera group”), by the large cylindrical domatia on the leaf rachis, and by the brown-orange pulverulent indumentum on the abaxial surface of the leaflets and the young twigs; on older branches the indumentum becomes darker, degrades and then breaks off. It also differs by its linear petals with the upper half densely tomentose, the hairs forming small tufts.
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RYLNIKOVA, M. V., G. I. AYNBINDER, N. A. MITISHOVA, and L. A. GADZHIEVA. "RESEARCHING REGULATIONS OF FIRE SULFIDE ORE AND BREED DURING COMBINED DEPOSIT DEVELOPMENT." News of the Tula state university. Sciences of Earth 2, no. 1 (2020): 341–56. http://dx.doi.org/10.46689/2218-5194-2020-2-1-341-356.
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Mineralogical and mineralogical-graphic analyzes of samples of the host and ore-bearing rocks of copper-zinc-pyrite deposits were carried out. The Program and the corresponding research methods offactors and patterns of development of the oxidation processes of sulfide ores and rocks have been developed and tested. The results of chemical-technological studies of sulfur-pyrite, copper-pyrite, copper-zinc ores, sericite-quartz rocks and metamorphosed tuffs are presented.
Dissertations / Theses on the topic "Tufts (Firm)"
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Ringshia, Aditya K. "Aerodynamic Measurements in a Wind Tunnel on Scale Models of a 777 Main Landing Gear." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/34583.
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Aerodynamic measurements were taken over models of the Boeing 777 high fidelity isolated landing gear in the 6- by 6-foot Virginia Tech Stability Wind Tunnel (VT-SWT) at a free-stream Mach number of 0.16. Noise control devices (NCD) were developed at Virginia Tech [9] to reduce noise by shielding gear components, reducing wake interactions and by streamlining the flow around certain landing gear components. Aerodynamic measurements were performed to understand the flow over the landing gear and also changes in the flow between "Baseline" and "NCD" configurations (without and with Noise Control Devices respectively). Hot-film, Pitot-static measurements and flow visualization using tufts were performed over an isolated 26% scale-model high fidelity landing gear for the "Baseline" and "NCD" configurations. Contours of turbulence intensity, normalized wake velocity and normalized total pressure loss for both configurations are compared. The "Baseline" configuration was also compared with the NASA Ames study conducted by Horne et al [7]. Hot-film measurements are also compared to Microphone Phased Array results which were acquired at Virginia Tech by Ravetta [8]. A novel technique for processing hot-film measurements by breaking turbulence into octave bands as acoustic measurements is presented.
Particle Image Velocimetry (PIV) measurements were taken at six different locations over the 13% scale-model landing gear with no door and at a truck angle of zero degrees. Results are compared to PIV measurements taken over the wheels of a four-wheel landing gear by Lazos [10-12]. PIV results such as average velocity contours and vectors, streamlines and instantaneous velocity contours and vectors are presented. Results presented from PIV and flow visualization are in good agreement with results from Lazos [10-12].Master of Science
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Noordhuis-Fairfax, Sarina. "Field | Guide: John Berger and the diagrammatic exploration of place." Phd thesis, Canberra, ACT : The Australian National University, 2018. http://hdl.handle.net/1885/154278.
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Positioned between writing and drawing, the diagram is proposed by John Berger as an alternative strategy for articulating encounters with landscape. A diagrammatic approach offers a schematic vocabulary that can compress time and offer a spatial reading of information. Situated within the contemporary field of direct data visualisation, my practice-led research interprets Berger’s ‘Field’ essay as a guide to producing four field | studies within a suburban park in Canberra. My seasonal investigations demonstrate how applying the conventions of the pictorial list, dot-distribution map, routing diagram and colour-wheel reveals subtle ecological and biographical narratives.
Books on the topic "Tufts (Firm)"
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Doug, Anderson. Keep your head down: A memoir. New York: W.W. Norton & Co., 2009.
Find full textBook chapters on the topic "Tufts (Firm)"
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Manley Hopkins, Gerard. "Nature is a Heraclitean Fire (1888)." In Literature and Science in the Nineteenth Century. Oxford University Press, 2009. http://dx.doi.org/10.1093/owc/9780199554652.003.0093.
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That Nature is a Heraclitean Fire and of the Comfort of the Resurrection Cloud-puffball, torn tufts, tossed pillows | flaunt forth, then chevy* on an air- built thoroughfare: heaven-roysterers, in gay-gangs | they throng; they glitter in marches. Down roughcast, down dazzling whitewash, ...
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Overbay, William J., Tench C. Page, Dennis J. Krasowski, Mark H. Bailey, and Thomas C. Matthews. "Geology, Structural Setting, and Mineralization of the Dolores District, Chihuahua, Mexico." In Northern Sierra Madre Occidental Gold-Silver Mines, Mexico, 29–43. Society of Economic Geologists, 2010. http://dx.doi.org/10.5382/gb.42.ch03.
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Abstract The Dolores project is located in the Sierra Madre Occidental mountain range of northern Mexico, near the historic mining district of Dolores in the state of Chihuahua. Exploratory drilling by Minefinders Corporation, Ltd., began in 1996 and has resulted in the discovery of one of Mexico's largest undeveloped gold-silver deposits. The regional geologic history of the area is dominated by three phases of volcanism: (1) A period of intermediate composition volcanism that resulted in deposition of voluminous andesitic flows and volcaniclastics interlayered with lesser amounts of felsic ash (the Lower volcanic series). This occurred from ˜46 to 35 Ma, (2) The first phase was closely followed by eruption of dominantly felsic ash flow tuffs and flows of rhyolitic to latitic composition (the Upper volcanic series), which occurred between ˜35 and 27 Ma, (3) Finally, intermittent eruption of basaltic andesite in thin flows occurred from <27 to 3 Ma. Deposition of the Baucarit Formation, a conglomeratic basin-fill sedimentary unit with thin interlayers of basalt, also occurred in down-dropped basins during the Pliocene to Pleistocene, or approximately 5 to 1 m.y. ago. Definitive age dates for the mineralization at Dolores have yet to be established. Ages of vein-style Ag-Au mineralization throughout the Sierra Madre Occidental are reported to be between about 49 to 27 Ma (Clark et al., 1979). Geologic observations at Dolores suggest that mineralization occurred following the episode of voluminous andesitic volcanism and generally at the same time as deposition of the overlying latitic pyroclastic tuffs of the Lower volcanic series, because mineralization and alteration are generally confined to the andesites and the lowermost portion of the volcaniclastic rocks. It follows that the Dolores mineralization occurred prior to deposition of the Upper volcanic series and dates from about 38 to 35 Ma of age. Within the district, regional north-northwest-trending structures controlled emplacement of a series of porphyritic andesitic to latitic dikes and sills in conjunction with emplacement of several larger hypabyssal north-northwest-elongate, domal intrusive bodies that formed during deposition of the Lower volcanic series. Epithermal, low-sulfidation fluids, believed to be associated with the waning stages of the intrusive episode, deposited quartz-adularia and precious metals. Wider zones of mineralization formed within areas of higher permeability and where boiling and episodic hydrothermal brecciation were focused in areas of greater structural complexity. Consequently, the mineralization occurs both within high-level stockworks, breccias, and disseminations formed near the contact of the felsic volcaniclastic rocks with the underlying andesites and within more tightly confined north-northwest-trending feeders that continue to depth. Gold predominates in the higher levels of the system and can be found across widths of 100 m or more at an average grade of from 1 to up to 2 g/t. Mineralized feeders occur below these zones and can be from 2 to more than 20 m in width, with gold content of up to 10 to more than 200 g/t and silver content of 1 to more than 5 kg/t. In the studied resource area, Ag/Au ratios appear to be zoned about a central domal intrusive and vary from about 100:1 near the intrusive to less than 10:1 to the north and south. Trace element geochemistry includes variable Hg, As, and Sb in the higher elevations with increasing amounts of Pb, Zn, and minor Cu at depth. A combined program of reverse circulation and core drilling totaling 61,441 m in 291 holes has revealed mineralization that occurs within an area that is approximately 2,800 m long by more than 600 m across. Additional drill intercepts and surface geochemical assays outside of this area indicate the potential to increase the resource base throughout an overall area that is approximately 4,000 m by 1,200 m. A resource study within the most densely drilled 1,900 by 300 m area was completed in 2000. Economic analysis, based on work by a major international engineering firm, indicates that a bulk-minable resource of approximately 67 Mt, at a gold equivalent (Aueq) grade of 1.85 g/t, can be developed by open-pit mining methods. The total calculated resource within the study area is 100.1 Mt containing 2.45 Moz of gold and 129.7 Moz of silver, or 4.62 Moz of Aueq at a 60:1 ratio.
Conference papers on the topic "Tufts (Firm)"
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SITAREK-ANDRZEJCZYK, Monika, Jarosław PRZYBYŁ, and Marek GAJEWSKI. "THE EFFECT OF POST-HARVEST TREATMENT AND STORAGE CONDITIONS ON VITAMIN C CONTENT IN TWO LEAFY PARSLEY CULTIVARS." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.018.
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The objective of the study was to determine the content of vitamin C (L-ascorbic acid) in two leafy parsley (Petroselinum crispum Mill. Fuss) cultivars subjected to different post-harvest treatments. Ascorbic acid (AA), due to its instability, is one of the indicators of leafy vegetable freshness and quality. High content of this compound in vegetables is desired because of its bioactive properties. The cultivars differ in morphology of usable parts: ‘Rialto’ has flat lamina and ‘Petra’ triple-curled lamina. The plant material was obtained in 2015 and 2016 from experimental field in Warsaw-Wilanów. The leaves were washed directly after harvest: a) in tap water or b) in tap water with ozone added. Two methods of postharvest storage were applied: A) at the cold store and B) under simulated retail conditions. In the case of cold store method (A), the plants were tied in tufts and stored at the temperature of 0 °C and RH 90 % for 7, 14, 28 days in two variants: 1) in containers, where leaves petioles were immersed in water, and 2) in special bulk modified atmosphere packaging (MAP), dedicated to fresh herbs (Stepac, Israel). In the case of storage under simulated retail conditions (B), the leaves were kept for 48 hours at 10 °C, RH 30-40 % in two variants: 1) tufts wrapped in perforated PE film with petioles immersed in water, and 2) packed to retail MAPs, dedicated to leafy herbs (Stepac, Israel). Concentration of L-ascorbic acid in the leaves was determined spectrophotometrically, with the method based on reaction of Folin’s phenol reagent in low pH. Fresh and stored ‘Rialto’ leaves were characterised by a higher concentration of AA than ‘Petra’ leaves (110 and 44 mg g -1 f.w., respectively). Significant decrease of AA after ozone treatment was observed only for ‘Rialto’ directly after harvest. Storage length had significant influence on the content of AA in both cultivars. Decrease of AA content was observed during storage period. Average concentration of AA after 7 days of storage was 85 and 44 -1 f.w. for ‘Rialto’ and ‘Petra’, respectively. After 28 days of storage the concentration was 54% lower for ‘Rialto’ and 36% lower for ‘Petra’, compared to the initial content. Leaves after simulated retail conditions showed slightly lower AA content than those stored for 7 days in the cold room. Retail MAPs guaranteed significantly higher preservation of AA in both cultivars than wrapping in film with immersing in water. Washing in ozone-added water showed influence only on AA content in ‘Rialto’ leaves wrapped in film – they showed lower concentration of AA under simulated retail conditions. Our study showed that the content of AA in parsley leaves was cultivar dependent. Ozone treatment did not have negative effect on AA during the storage. Storage duration, rather than packaging methods, plays a key role in preservation of high content of AA. However, method of packaging is important under retail conditions, where temperature is higher and RH is much lower, than at a cold room.
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Pym, Stephen A., Asad Asghar, William D. E. Allan, and John P. Clark. "A Low Reynolds Number Experimental Evaluation of Tubercles on a Low-Pressure Turbine Cascade." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91699.
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Abstract Aircraft are operating at increasingly high-altitudes, where decreased air density and engine power settings have led to increasingly low Reynolds numbers in the low-pressure turbine portion of modern-day aeroengines. These operating conditions, in parallel with highly-loaded blade profiles, result in non-reattaching laminar boundary layer separation along the blade suction surface, increasing loss and decreasing engine performance. This work presents an experimental investigation into the potential for integrated leading-edge tubercles to improve blade performance in this operating regime. A turn-table cascade test-section was constructed and commissioned to test a purpose-designed, forward-loaded, low-pressure turbine blade profile at various incidences and Reynolds numbers. Baseline and tubercled blades were tested at axial chord Reynolds numbers at and between 15 000 and 60 000, and angles of incidence ranging from −5° to +10°. Experimental data collection included blade surface pressure measurements, total pressure loss in the blade wakes, hot-wire anemometry, surface hot-film measurements, and surface flow visualization using tufts. Test results showed that the implementation of tubercles did not lead to a performance enhancement. However, useful conclusions were drawn regarding the ability of tubercles to generate stream-wise vortices at ultra-low Reynolds numbers. Additional observations helped to characterize the suction surface boundary layer over the highly-loaded, low-pressure turbine blade profile when at off-design conditions. Recommendations were made for future work.
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El-Shafey, Ramadan E., Mohamed Heikal, Hatem El-Dsoky, Gehad Mohamed Saleh, and Ahmed Abubakr Omar. "Geochemical and Experimental Investigations of some Egyptian Volcanic Tuffaceous Rocks as Natural Supplementary Cementitious Materials." In 15th International Conference on Sustainable Green Construction and Nano-Technology "Advances in Fire Safety, HVAC-R, and Built Environment". Switzerland: Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-1q2wab.
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Supplementary cementitious materials are additives that are used to improve the qualities of Portland cement while also reducing its environmental impact. The production of such blended cements relies on the regional availability of additional components. Despite the prevalence of volcanic tuffs in the Eastern Desert and South Sinai encountered in Egypt, there is a scarcity of knowledge regarding experimental research on cement manufacture. The main objective of this study is to analyze the geochemical and experimental characteristics of several volcanic tuffaceous rocks exploited as natural additional cementitious materials and their impact on the characteristics of the resulting blended cement. The partially replacement can play an important role in reducing the local environmental impacts (CO2 emissions). Various volcanic rock specimens have been collected from the Sinai (Wadi Kid) and the Eastern Desert (Gabal Umm Zarabit, Wadi Umm Khariga, Gabal Igla El-Iswid, and Abu Wassat), Egypt. The samples under study were examined for their mineralogy, petrography, and chemical composition in order to identify their specifications. In addition, a total of fifteen blended cement samples were produced by partially replacing clinker with the investigated samples. The substitution ratios used were 10%, 20%, and 25% by mass. A control mix was also designed, consisting of ordinary Portland cement without any other substances. An assessment has been conducted on the effects of partially replacing clinker with volcanic rocks on the characteristics of the resulting blended cement. The physico-mechanical parameters, including Blaine, setting time, flexural strength, and compressive strength, of the hardened blended mortars were measured at specific times (7 and 28 days). The study demonstrated that the strength of the studied blended cement mixes decreased as the fraction of the examined volcanic rocks to clinker ratio increased throughout the early stages. The highest compressive strength among the mixtures evaluated was achieved when using a 10% ratio of volcanic rocks as clinker replacement.