Дисертації з теми "High-pressure Techniques"
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Allan, David Robert. "Crystal-structure studies and techniques at high pressure." Thesis, University of Edinburgh, 1993. http://hdl.handle.net/1842/17021.
Повний текст джерелаRidley, Christopher James Taylor. "Development of high pressure and cryogenic techniques, and their application to neutron diffraction." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28890.
Повний текст джерелаKepa, Michal Wawrzyniec. "Probing the phase diagram of the ferromagnetic superconductor UGe2 using high pressure ultrasonic techniques." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/15955.
Повний текст джерелаLeonard, Simon. "Solid-state structural chemistry at high pressure using X-ray synchrotron radiation diffraction techniques." Thesis, University of Leicester, 1990. http://hdl.handle.net/2381/33783.
Повний текст джерелаEdwards, Clare M. "Applications of high-pressure spectroscopic and powder x-ray diffraction techniques to inorganic materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0005/NQ44419.pdf.
Повний текст джерелаEdwards, Clare M. "Application of high-pressure spectroscopic and powder X-ray diffraction techniques to inorganic materials." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=37544.
Повний текст джерелаChe, Idris Azam. "Characterization of high speed inlets using global measurement techniques." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/characterization-of-high-speed-inlets-using-global-measurement-techniques(ca8b687b-aff0-4b50-892f-897a962e22ba).html.
Повний текст джерелаFerguson, Derek. "The development of air-cooling techniques for fast response pressure transducers in high temperature environments." Thesis, Cranfield University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387639.
Повний текст джерелаFacy, Olivier. "Optimisation des techniques de chimiothérapie intracavitaire." Thesis, Dijon, 2013. http://www.theses.fr/2013DIJOMU07/document.
Повний текст джерелаIntroduction. In order to achieve a good effect, chemotherapy drugs need to penetrate into the peritoneal (HIPEC) or pleural tissue. Hyperthermia and high-pressure may enhance this penetration. The aim of this study was to evaluate their peritoneal effect and to establish the best technique to it. A feasibility study of an intrapleural high-pressure was an essential step to export these effects to the thoracic space. Methods. Four groups of pigs underwent an open HIPEC with a constant concentration (150 mg/l) of oxaliplatin during 30 minutes either in normothermia, or in hyperthermia (42-43°C); and either with atmospheric pressure or with high-pressure (25 cmH2O). Two more groups underwent a closed procedure with hyperthermia and either high-pressure or very high-pressure (40 cmH2O). The systemic and tissue absorption of oxaliplatin were studied. The haemodynamic and respiratory tolerance of a pleural infusion was also tested in 21 pigs with and without associated resection; with and without chemotherapy infusion (cisplatin + gemcitabin) and at various levels of pressure (from 15 to 25 cmH2O). Results. Hyperthermia enhances the concentrations of platinum in visceral surfaces (p=0.0014), whereas high-pressure enhances it both in visceral and in parietal surfaces (p= 0.0058 and p= 0.0044, respectively). Their association obtains the highest concentrations both in the visceral (p= 0.00001) and the parietal peritoneum (p= 0.0003). The concentrations obtained during closed procedure are lower than those achieved with the open technique, even with 40 cmH2O of pressure. A 60-minutes intrapleural chemotherapy perfusion with 20 cmH2O of pressure without any lung resection was the maximal tolerated level. Conclusion. During HIPEC, hyperthermia improves the penetration of oxaliplatin in the visceral peritoneum, whereas high-pressure is effective in both peritoneal surfaces. Their association is synergic and the open technique seems to be the best one to deliver it. An intrapleural chemotherapy with a 20 cmH2O pressure is feasible in this model
Kirollos, Benjamin William Mounir. "Aerothermal optimisation of novel cooling schemes for high pressure components using combined theoretical, numerical and experimental techniques." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:72168abd-48f7-49c6-a6ef-3d4a9f6cc6e9.
Повний текст джерелаO'Dowd, Devin Owen. "Aero-thermal performance of transonic high-pressure turbine blade tips." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:e7b8e7d0-4973-4757-b4df-415723e7562f.
Повний текст джерелаWatson, Robert. "New numerical techniques to quantify and predict the effect of entrainment defects, applied to high pressure die casting." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/7153/.
Повний текст джерелаPereira, M. F. V. T., M. Williams, and R. Bruwer. "Rapid die manufacturing using direct laser metal deposition." Journal for New Generation Sciences, Vol 7, Issue 3: Central University of Technology, Free State, Bloemfontein, 2009. http://hdl.handle.net/11462/542.
Повний текст джерелаGlobal issues such as energy and climate changes have impacted on both the automotive and aerospace industries, forcing them to adopt measures to produce products that consume fewer combustibles and emit less carbon dioxide. Making vehicles lighter is one of the logical ways of reducing fuel consumption. The need for light components, able to fulfil technical and quality specifications, led to market growth for tooling that is able to mass produce parts using manufacturing processes such as high pressure die casting. Competitive pressures to reduce the lead time required for tooling-up has also increased dramatically. For this reason research into various methods, techniques and approaches to tool manufacture is being undertaken globally. This paper highlights the work undertaken at the CSIR on the issue of rapid die manufacturing through the application and evaluation of a rapid prototyping technique and coating technologies applied to die components of a high pressure casting die for the production of aluminium components. Criteria for determining suitability were developed against which the technique was evaluated that included time, cost and life-expectancy. Results of accelerated testing procedures to evaluate the die material produced by the rapid prototyping technique and surface coatings and treatments of die materials for their resistance to washout, erosion, heat checking and corrosion in a high pressure die casting environment, are presented. The outcomes of this research will be used for further development and application of specific techniques, design principles and criteria for this approach.
Pereira, M. F. V. T., M. Williams, and Preez W. B. Du. "Characterization of metal powder based rapid prototyping components with respect to aluminium high pressure die casting process conditions." Journal for New Generation Sciences, Vol 8, Issue 2: Central University of Technology, Free State, Bloemfontein, 2010. http://hdl.handle.net/11462/563.
Повний текст джерелаThis paper is based on tests performed on die component specimens manufactured by EOS-DMLS (direct metal laser sintering) and LENS (laser engineered net shape) RP (rapid prototyping) technology platforms, as well as manufactured specimens machined out of preferred standard hot work steel DIN 1.2344. These specimens resemble typical components used in metal high pressure die casting tool sets. The specimens were subjected to a programme of cyclic immersion in molten aluminium alloy and cooling in water-based die release medium. The heat checking and soldering phenomena were analyzed through periodic inspections, monitoring crack formation and evidence of surface washout. At the end of the thermal tests, mechanical strength and hardness tests were performed to assess toughness and core resistance variations in relation to the initial conditions. Finally metallographic investigations were performed through optical microscopy on all the specimens considered. The outcomes of this research will be presented and used by the CSIR for further development and application of the assessed EOS-DMLS and LENS rapid prototyping technologies in rapid die manufacturing techniques and die design principles, including time and economic feasibility criteria to be applied when considering rapid die manufacture.
Bogdanov, Bogdan. "Structures, thermochemistry, and dynamics of negative gas phase cluster ions studied by pulsed-ionization high pressure mass spectrometry and computational quantum chemistry techniques." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ65224.pdf.
Повний текст джерелаZHANG, TANTAN. "Design of innovative solutions for high-pressure fuel injection systems, optimization of measuring techniques for injected flow-rate and modeling of 1D flows." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2843978.
Повний текст джерелаPilsl, Ludwig K. A. [Verfasser], and Oliver [Akademischer Betreuer] Reiser. "Enantioselective cyclopropanation of heterocycles and the use of high-pressure techniques for the conformational analysis of peptide foldamers / Ludwig K. A. Pilsl. Betreuer: Oliver Reiser." Regensburg : Universitätsbibliothek Regensburg, 2014. http://d-nb.info/1070996041/34.
Повний текст джерелаNavare, Arti T. "Development of high-sensitivity atmospheric pressure (ap) matrix-assisted laser desorption/ionization (maldi) and open air ionization techniques for the analysis of biomolecules by mass spectrometry." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33942.
Повний текст джерелаPu, Yongjia. "AN ASSOCIATION STUDY BETWEEN ADULT BLOOD PRESSURE AND TIME TO FIRST CARDIOVASCULAR DISEASE." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3857.
Повний текст джерелаBlackmore, Paul David. "Degradation of polymeric outdoor high voltage insulation : surface discharge phenomena and condition assessment techniques." Thesis, Queensland University of Technology, 1997.
Знайти повний текст джерелаSaouane, Sofiane [Verfasser], Francesca [Akademischer Betreuer] [Gutachter] Fabbiani, Werner F. [Gutachter] Kuhs, Ralf [Gutachter] Ficner, Heidrun [Gutachter] Sowa, Dietmar [Gutachter] Stalke, and Kai [Gutachter] Tittmann. "Extending the Search Space for Novel Physical Forms of Pharmaceuticals and Biomolecules using High-Pressure Techniques / Sofiane Saouane. Betreuer: Francesca Fabbiani. Gutachter: Francesca Fabbiani ; Werner F. Kuhs ; Ralf Ficner ; Heidrun Sowa ; Dietmar Stalke ; Kai Tittmann." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://d-nb.info/110448045X/34.
Повний текст джерелаSaouane, Sofiane Verfasser], Francesca [Akademischer Betreuer] [Gutachter] Fabbiani, Werner F. [Gutachter] Kuhs, Ralf [Gutachter] Ficner, Heidrun [Gutachter] [Sowa, Dietmar [Gutachter] Stalke, and Kai [Gutachter] Tittmann. "Extending the Search Space for Novel Physical Forms of Pharmaceuticals and Biomolecules using High-Pressure Techniques / Sofiane Saouane. Betreuer: Francesca Fabbiani. Gutachter: Francesca Fabbiani ; Werner F. Kuhs ; Ralf Ficner ; Heidrun Sowa ; Dietmar Stalke ; Kai Tittmann." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://nbn-resolving.de/urn:nbn:de:gbv:7-11858/00-1735-0000-0028-878A-D-4.
Повний текст джерелаCharnay, Romain. "Experimental study of flow boiling in horizontal minichannels at high saturation temperature." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0047/document.
Повний текст джерелаBecause of current environmental issues, some technologies are being developed to reduce the fuel consumption and to reduce the emissions of CO2. Energy recovery by means of Organic Rankine Cycles or Hirn Cycles recovery is one investigated track to answer these issues. At present, some systems based on Organic Rankine Cycle (ORC) are available in industry but advanced studies are needed to allow their application in the road transport industry. A better understanding of the two-phase fluid behaviour is necessary to optimize the design models of the components containing a two-phase refrigerant. For the Organic Rankine Cycle system, the thermodynamic conditions are different to standards relevant to refrigeration or air-conditioning systems. Indeed, the key characteristic of the ORC system is the evaporation saturation temperature. Exhaust gases temperature ranges from 400°C to 900°C and the refrigerant evaporation occurs at temperatures higher than 100°C. Almost all the flow boiling heat transfer models or correlations have been obtained for saturation temperatures ranging from -20°C to 40°C which correspond to standards relevant to refrigeration or air conditioning systems. The empirical models for boiling in such conditions are limited by the experimental data on which they are based, whereas analytical and theoretical approaches are needed to advanced knowledge on the behaviour of thermohydraulic two-phase refrigerant. This PhD thesis aims at studying the flow boiling characteristics of R-245fa in a 3.00 inner diameter channel in the thermodynamic conditions of the ORC system. Therefore, the saturation temperature ranged from 60°C to 120°C. To achieve this goal, an experimental test facility was designed and built to conduct refrigerant evaporation experiments. This test facility allowed to perform flow regime visualizations, pressure drop and heat transfer measurements in minichannel. First, an image processing method for two phase flow pattern characterization was developed. Based on this method and with the help of an adequate analysis of the heat transfer coefficient, the main flow regimes have been identified. The influence of saturation temperature on the flow patterns and their transitions has been highlighted. The second objective was to provide new experimental data concerning flow boiling heat transfer in minichannel. Flow boiling heat transfer coefficients at such high temperature have, so to say, almost never been reported in the open literature so far. The influence of saturation temperature on the heat transfer mechanisms has been discussed. In order to evaluate the capability of the current flow boiling prediction methods to predict the heat transfer coefficient, the comparison between experimental results and theoretical results predicted with the commonly used correlations and models were made. Lastly, pressure drop databases are presented. Experimental values of pressure drops were compared against several methods
GIKUNDA, MILLICENT NKIROTE. "An improved sample loading technique for cellular metabolic response monitoring under pressure." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1470194454.
Повний текст джерелаLu, Yubin. "The dynamic behaviour of hydrostatic-pressure-sensitive materials at high strain-rates based on split hopkinson pressure bar technique." Thesis, University of Manchester, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515096.
Повний текст джерелаJohnson, Timothy Paul Mahal. "High strain rate mechanical characterization of trabecular bone utilizing the split-Hopkinson pressure bar technique." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/38294.
Повний текст джерелаIncludes bibliographical references (p. 185-188).
The split-Hopkinson pressure bar (SHPB) technique has been in use in one form or another for more than fifty years and has recently gained a great deal of attention for its ability to characterize materials such as metals, plastics, and even stiff foams at strain rates of up to 105 sec-1. Historically, however, numerous obstacles have stood in the way of applying this technique to softer biological tissues. This study is aimed at bridging this gap by employing various innovations in the field of split-Hopkinson pressure bar techniques (including hollow aluminum and solid polymeric pressure bars) to the characterization of trabecular bone. A preliminary study is conducted on a polyurea (PU) blend to assess the advantages and shortcomings of these approaches, as well as to validate the results obtained with each. Bovine trabecular bone with marrow in-situ, which was chosen for its ability to be tested with a wide spectrum of techniques, is then characterized with the selected techniques at rates of up to 1300 s-1 and strains of 0.07. The results are presented for each technique in the form of engineering stress vs. engineering strain curves.
(cont.) Average trend curves are also provided. Unfortunately, many of the samples were too damaged to allow for accurate measurement of apparent density. Consequently, a study into the effect of density on high strain rate responses is left as future work. Recommendations are made for increasing the strain imposed on the samples and suggestions for future studies on both trabecular bone and softer biological tissues are put forward.
by Timothy Paul Mahal Johnson.
S.M.
De, Villiers A. J. (Andre Joubert). "Evaluation of pressure- and electrodriven separation techniques for the determination of phenolic compounds in wine." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51753.
Повний текст джерелаENGLISH ABSTRACT: The phenolic content of wine is responsible for determining characteristics such as the organoleptic qualities, colour stability, ageing properties and health-beneficial effects associated with wine. The aim ofthis study was to investigate the possibilities offered by capillary electrophoresis (CE) as an alternative separation technique to high performance liquid chromatography (HPLC) for the analysis of polyphenols in wine. The complexity of wine samples was the cause that neither technique was capable of a satisfactory singlestep analysis of wine. Suitable sample preparation techniques such as Sephadex- and Sep- Pak fractionation and ether extraction of wine polyphenols were investigated. These techniques did not, however, prove to be universal. A novel form of sample preparation namely a process analogous to lyophylization used to separate wine volatiles from nonvolatiles was introduced. The versatility of CE was further investigated in an attempt to eliminate the need for sample preparation. The use of polyvinylalcohol (PVA) coated capillaries, micellar electrokinetic chromatography (MEKC) and capillary gel electrophoresis (CGE) were investigated in this regard. Although none of these techniques could offer conclusive results, useful applications were forthcoming and routes for further investigation were outlined. Liquid chromatography coupled to electro spray ionisation mass spectroscopy (LC-ESI-MS) and capillary electrophoresis coupled to electro spray ionisation mass spectroscopy (CE-ESI-MS) were compared for the analysis of polyphenols in wine. While the latter technique could not produce sufficient separation compared to the former, future development ofCE-ESI-MS should make it a powerful technique for these analyses.
AFRIKAANSE OPSOMMING: Die fenoliese komponente in wyn speel 'n bepalende rol by eienskappe soos die organoleptiese karakter, kleur stabiliteit, verouderingspotensiaal en gesondheids-voordele wat met wyn geassosieër word. Die doel van hierdie projek was om ondersoek in te stel na die potensiaal wat kapillêre elektroforese (CE, "capillary electrophoresis") as 'n alternatiewe skeidingstegniek teenoor hoë druk vloeistof chromatografie (HDVC) vir die analise van die polifenole in wyn bied. Die kompleksiteit van wyn monsters is van so 'n aard dat 'n bevredigend enkelstap analise met geeneen van die tegnieke moontlik is nie. Gepaste monster-voorbereidingstappe soos Sephadex- en Sep-Pak fraksionering asook eter ekstraksie van die polifenole in wyn is ondersoek. Geeneen van die tegnieke was egter universeel toepaslik nie. 'n Nuwe metode van monster-voorbereiding, naamlik 'n proses analoog aan liofilisasie wat gebruik word om die wyn te skei in vlugtige en nievlugtige komponente is gedemonstreer. Die veelsydigheid van CE was gevolglik ondersoek in 'n poging om monstervoorbereiding uit te skakel. Die gebruik van polyvinielalkohol-(pVA) bedekte kapillêre, missellêre elektrokinetiese chromatografie (MEKC) en kapillêre gel elektroforese (CGE, "capillary gel electrophoresis) is in hierdie verband ondersoek. Alhoewel geeneen van hierdie tegnieke onweerlegbare resultate gelewer het nie, het bruikbare toepassings hieruit voortgespruit en is die grondslag vir verdere navorsing gelê. Vloeistof chromatografie gekoppel aan eIektrosproei ionisasie massaspektroskopie (LCESI- MS) en kapillêre elektroforese gekoppel aan elektrosproei ionisasie massaspektroskopie (CE-ESI-MS) is vergelyk vir die analise van polifenole in wyn. Alhoewel laasgenoemde tegniek onvoldoende skeiding lewer vergeleke met eersgenoemde, behoort toekomstige ontwikkelinge op die gebied van CE-ESI-MS dit 'n kragtige tegniek vir die analise van hierdie monsters te maak.
Balugani, Sofia. "Experimental protocol for the determination of elastic properties at ambient and high pressure by picosecond acoustics technique." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22350/.
Повний текст джерелаAl, Hinai Nasser Mohammed Saba. "A Novel Mobility Control Technique in Miscible Gas Injection Using Direct Gas Thickening in High Pressure and Temperature Reservoir." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/75655.
Повний текст джерелаArnaud, Cécilia. "Elaboration d’aliments nouveaux par hautes pressions : étude technique et juridique." Electronic Thesis or Diss., Nantes, Ecole nationale vétérinaire, 2017. http://www.theses.fr/2017ONIR103F.
Повний текст джерелаHigh pressure processing is an innovative technology for food preservation which consists in the uniform pressurization of a vacuum packed product. Moreover, eafood sector, in a huge expansion, must answer the consumers’ demands for healthier and less transformed food items. This research study reports on the evaluation of the pressurization impact on technological, organoleptic and nutritional characteristics of the muscle of a lean fish, cod, a fatty fish, salmon and a shellfish,Pecten maximus scallop following a cold storage. This innovative product correspond to Ready-to-Eat marinated and raw slices of seafood. The samples were subjected to a high pressure treatment of 150, 300 or 450 MPa and stored at 4 °C for 21 days. The pressurization impacts fish constituents (proteins and lipids), thus modifying the products physical properties (color and texture). A 450 MPa treatment is necessary to preserve cod and salmon until 11 days and scallop until 19 days. With this pressure level, the seafood product is acceptable for a crude consumption. Moreover, the marinade to go along with those products was formulated as an organogel to obtain innovative properties. In addition, a study of the legal aspect and the consumer’s perception of the high pressure technology was carried out. High pressure processing is regulated under the regulation Novel Food of 1997 which was revised in 2015. Consumers are receptive to the benefits of high pressure processing
Salama, Fawzi. "Electrostatic Charge Generation and Wall Fouling in a High-Pressure Gas-Solid Fluidized Bed: Implementation and Preliminary Testing of a Measurement Technique." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/26123.
Повний текст джерелаTupper, Heather Suzanne. "The effects of divalent cations on the dynamics of sulfogalactosylceramide and sulfogalactosylacylalkylglycerol multilayers: A study using the technique of high pressure Fourier-transform infrared spectroscopy." Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10063.
Повний текст джерелаGiraudet, Cédric Michel Marius. "Contributions à l’étude de la thermo diffusion de mélanges binaires en conditions de réservoirs." Thesis, Pau, 2015. http://www.theses.fr/2015PAUU3003/document.
Повний текст джерелаThermodiffusion, also called the Soret effect, describes the coupling between temperature gradient and resulting fluxes. This phenomenon is involved in a number of natural and industrial processes. In particular, multi components fluids in petroleum reservoirs are subjected to this phenomenon because of the geo-thermal gradient. Nevertheless, in spite of a lot of advances, there are few available data of this phenomenon and the establishment of a theoretical model, able to give a quantitative estimation of these transport coefficients whatever molecules in presence, is still an open question. The principal aim of this thesis is to develop an experimental approach allowing providing reference data on thermodiffusion as a function of the pressure. During this thesis, we developed a high pressure thermodiffusion cell in free medium, enabling us to study concentration non-equilibrium fluctuations induced by the Soret effect by means of shadowgraph optical technique. With this setup we investigated two binary mixtures representatives of petroleum fluids; namely the equimassic tetralin/dodecane mixture in liquid phase and the carbon dioxide/methane mixture in gaseous and super critical state. Furthermore, molecular dynamic simulations on the second mixture were performed. Using a dynamic image analysis, we have measured molecular diffusion and Soret coefficient for the tetralin/dodecane mixture. Within experimental uncertainties, we observed a linear decrease of these coefficients with the pressure. Furthermore, we were able to observe the effect of confinement (finite size effect induced by cell vertical boundary conditions) on fluctuation dynamics, in good agreement with calculations and simulations based on hydrodynamic fluctuation theory on similar solutal Rayleigh number. Concerning the carbon dioxide/methane mixture, the dynamic analysis revealed a kinetic too fast for our experimental apparatus. Conversely, static analysis revealed a rapid increase of the non-equilibrium fluctuation magnitude as a function of the pressure up to a threshold beyond which it decreases. On this mixture, performed molecular dynamic simulations provided results in good agreement with expected theoretical behaviour
Diegor, Wilfredo G. "Development of a high pressure digestion technique and a data acquisition/reduction procedure and their application to the ICP-MS analysis of urban sediments and soils from Cebu, Philippines." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0003/MQ42368.pdf.
Повний текст джерелаDunja, Jakovljević. "Biološko dejstvo vodenog ekstrakta ploda štavelja (Rumex crispus L., Polygonaceae)." Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2019. https://www.cris.uns.ac.rs/record.jsf?recordId=110304&source=NDLTD&language=en.
Повний текст джерелаCurly dock (Rumex crispus, Polygonaceae) is a wild perennial herbaceous plant, which products are described as a rich source of phenolic compounds. Apart from being considered a seriously invasive weed, young leaves of curly dock are edible and often used as salad. Furthermore, the use of its fruits has been described in Serbian and Turkish traditional medicine against stomach complaints. The objectives of this study were to evaluate in vitro and in vivo antioxidant/prooxidant and cytotoxic activities, and to determine an eventual in vitro anti-inflammatory effect of the aqueous extract of Rumex crispus fruits. Total flavonoid content was determined by spectrophotometric method. Qualification and quantification of flavonoids were confirmed using High performance liquid chromatography (HPLC). The aqueous extract of curly dock fruits was evaluated for its antioxidant activity by in vitro assays for Ferric-reducing antioxidant power (FRAP), NO•, OH• and DPPH•-free radical scavenging activities and the influence on lipid peroxidation in liposomes. The cytotoxicity of tested extract was examined in vitro in human cervix carcinoma (HeLa), colon adenocarcinoma (HT-29) and breast adenocarcinoma (MCF7). Also, the potential in vivo hepatoprotective and antioxidant properties of investigated extract were determined on CCl4-induced oxidative stress in experimental animals. Furthermore, the hypothesis that the examined extract might show in vivo antiproliferative activity in Ehrlich carcinoma (EAC) and Hepatoma AS30D cells was tested by measuring volume of ascites, percentage of viable cells and level of several antioxidant enzymes. The optimized in vitro test for determination of cyclooxygenase-1 (COX-1) and 12-lipoxygenase (12-LOX) inhibition potency was undertaken in order to estimate an anti-inflammatory effect of aqueous extract of R. crispus fruits. HPLC analysis revealed miquelianin as the most abundant flavonoid constituent of the extract. The tested extract might have an antioxidant activity resulting in scavenging of free radicals and ability to decrease lipid peroxidation in liposomes. The results could indicate tissue-selective cytotoxicity of R. crispus fruit extract in vitro. The most prominent antitumor activity was observed towards HeLa and MCF7 cell lines. The data suggested that investigated extract may be considered as potential in vivo hepatoprotective and antioxidant agent due to prevention of the liver injuries induced by oxidative damage. On the other hand, mentioned extract could exhibit in vivo prooxidant property, causing the oxidative stress in malignant transformed EAC and AS30D cells and reducing volume of ascites and percentage of viable cells, in comparison with control group. Changes in activities of antioxidant enzymes might be the results of induced oxidative stress in EAC and AS30D cells, especially in the pretreated animals. The aqueous extract of curly dock fruits showed COX-1, as well as 12-LOX inhibitory activity, suggesting that tested extract might be an anti-inflammatory agent. It could be concluded that aqueous fruit extract of R. crispus might have antioxidant, cytotoxic and anti-inflammatory activities. The prooxidant properties of examined extract could be the mechanism of potential antiproliferative effect of extract.
Pioche, Mathieu. "Optimisation de la technique de dissection sous muqueuse à l’aide d’un bistouri à jet d’eau haute-pression pulsée pour le traitement endoscopique des tumeurs superficielles du tube digestif." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10166/document.
Повний текст джерелаFirst of all, we worked on the training for unexperienced operators by developing a bovine colon model more adapted to the European situation where colo-rectal lesions are the most common. This model of rectum from bovine, easy to find and to prepare allows training in conditions most close to the human colonic wall than those offered by the pig stomach. Furthermore, such models allows to teach the initial skills but avoiding the risk of adverse events for the first procedures in humans. A future work evaluating the benefits of a learning support by a dedicated interactive software on this model with 37 french and Japanese students is now being analyzed and will be reported soon. Then we thought about the strategy of the procedure in order to make it more simple using the tunnel technique to perform ESD for the esophageal lesions. This strategy helps to maintain traction on the edges and offers a sort of triangulation physically expanding the working space. This strategy has become a standard for esophageal resections in many teams and we still work to improve its efficacy. Finally, we worked jointly with Nestis® Company to develop a tool to optimize the submucosal dissection procedure by combining the benefits of the catheters bi function (injecting and cutting with the same tool), but adding high pulsed pressure and capability to inject viscous macromolecular solutions. The Nestis® system allows for the first time this association and demonstrated his interest in terms of security and performance compared with the conventional method using the needle and a conventional electrocautery device. With this bi function tool, it is not necessary to change instrument frequently since all stages of the procedure are now done with a single device. Other projects are already included with this material to explore its benefits and its safety in human colonic dissection that is deemed as the most difficult due to the thinner wall. Finally, this material offers the possibility to inject pressurized active drugs which could be used in the future to prevent the occurrence of esophageal strictures or to direct healing. We also worked with the hospital Edouard Herriot pharmacy to stabilize the solution glycerol mix to allow its use in daily practice in our unit
Zauer, Mario, Frank Meissner, Rudolf Plagge, and André Wagenführ. "Capillary pore-size distribution and equilibrium moisture content of wood determined by means of pressure plate technique." De Gruyter, 2016. https://tud.qucosa.de/id/qucosa%3A38475.
Повний текст джерелаPatout, Maxime. "Evaluation des techniques pour la prise en charge diagnostique et thérapeutique de l'insuffisance respiratoire chronique A Randomized controlled trial on the effect of needle gauge on the pain and anxiety experienced during radial arterial puncture Long term survival following initiation of home non-invasive ventilation : a European study Neural respiratory drive predicts long-term outcome following admission for exacerbation of COPD : a post hoc analysis Neural respiratory drive and cardiac function in patients with obesity hypoventilation syndrome following initiation of non-invasive ventilation Polysomnography versus limited respiratory monitoring and nurse-led titration to optimise non-invasive ventilation set-up a pilot randomised clinical trial Chronic ventilator service Step-down from non-invasive ventilation to continuous positive airway pressure : a better phenotyping is required AVAPS-AE versus ST mode : a randomized controlled trial in patients with obesity hypoventilation syndrome Technological advances in home non-invasive ventilation monitoring : reliability of data and effect on patient outcomes Efficacy of a home discharge care bundle after acute exacerbation of COPD Prediction of severe acute exacerbation using changes in breathing pattern of COPD patients on home noninvasive ventilation Charasteristics and outcome of patients set up on high-flow oxygen therapy at home Trial of portable continuous positive airway pressure for the management of tracheobronchomalacia." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMR115.
Повний текст джерелаSingle-organ respiratory failure defines chronic respiratory failure. Obesity hypoventilation syndrome is the main cause of chronic respiratory failure and occurs in 4 to 5% of obese patients. Chronic respiratory failure is also the end-stage evolution of chronic obstructive pulmonary disease that has a prevalence of 6 to 8% in the adult population. The incidence of these diseases increases so does the incidence of chronic respiratory failure. In this thesis, we will evaluate novel diagnostic and therapeutic modalities that could improve the care of patients with chronic respiratory failure. Regarding diagnostic modalities, we have seen that evaluating the work of breathing with surface parasternal electromyography was an independent prognostic marker in patients with chronic obstructive pulmonary disease. We have also seen that it was a relevant tool to predict the clinicalefficacy and compliance to home non-invasive ventilation. Regarding therapeutic modalities, we have shown that the use of a semi-automatic mode of non-invasive ventilation had the same efficacy of a standard mode with a shorter length of stay for its setup. We have shown the relevance and feasibility of the use of high-flow oxygen therapy in the home setting whilst it was only used in intensive care units. Finally, we have shown the benefits of continuous positive airway pressure during exertion in patients with tracheobronchomalacia. Regarding patients’ follow-up, we have shown that the use of data from built-in software could predict the onset of a severe exacerbation of chronic obstructive pulmonary disease. However, we also show that the implementation of tele-medicine in patients with chronic respiratory failure cannot be included in daily clinical practice yet. In this thesis, we have identified novel physiological tools, novel ways to administer treatments and novel follow-up tools that can improve the management of patients with chronic respiratory failure
Clariana, Orduña Maria. "Efecto de la aplicación de altas presiones hidrostáticas en un producto de origen animal, el jamón curado y en un producto vegetal, el nabo." Doctoral thesis, Universitat de Girona, 2011. http://hdl.handle.net/10803/53634.
Повний текст джерелаLa aplicación de altas presiones hidrostáticas es una técnica de conservación de alimentos que puede ser una alternativa al tratamiento térmico. La presurización, en teoría, produce una menor modificación de las propiedades organolépticas y de los compuestos antioxidantes. En el presente trabajo se ha estudiado el efecto de las altas presiones hidrostáticas en los procesos oxidativos y su relación con las cualidades organolépticas del nabo troceado y del jamón curado empaquetado loncheado. Los resultados obtenidos han apuntado a que la presurización a 600 MPa, además de producir una descontaminación efectiva, es la que causa una menor pérdida de compuestos o propiedades antioxidantes. En el caso del nabo, esta presión también es la que ocasiona una menor modificación de las cualidades organolépticas. En el presente trabajo también se ha observado que en función de la composición del alimento, el efecto de la presurización en las cualidades organolépticas puede ser diametralmente opuesto.
Cortez, André Filipe Ventura. "Novel Techniques for High Pressure Noble Gas Radiation Detectors." Doctoral thesis, 2018. http://hdl.handle.net/10316/83817.
Повний текст джерелаThis thesis presents the studies conducted with the objective of developing a new and ruggedized Gas Proportional Scintillation Counter (GPSC) based on high-pressure Xe (5- 20 bar) with a cylindrical geometry for the detection of hard X- and gamma-rays (100 keV to 662 keV). It is to be used in eld applications, where robustness is a requirement, for example in homeland security (detection of illegal transport of radioactive material) or for geological prospection (instrumentation for boreholes). A study of the mobility of ions in gases used in large volume detectors is also presented. In GPSCs, the detection of ionizing radiation is based on the production of scintillation photons as the ampli cation stage, followed by their detection with the help of a photosensor, typically a photomultiplier. GPSCs have an absorption/drift region where the ionizing radiation is absorbed, producing a cloud of primary electrons which is guided by a low electric eld (kept below the excitation threshold of the gas) to the scintillation region, where the electric eld is above the scintillation threshold but below the ionization threshold of the gas. In the scintillation region, they produce a large number of scintillation photons (vacuum ultra-violet photons), emitted during the deexcitation process of the gas atoms. These will eventually reach the photosensor, producing a signal proportional to the energy of the incident radiation. Conventionally, the adopted geometry is planar, since it displays the best energy resolution, but because of the photosensors usually adopted, its use in eld applications is limited. In a recent work, a prototype was developed with a planar geometry with the objective of being more ruggedized for eld applications. The main di erence consisted of the use of a deposited caesium iodide as the photosensor, with the photoelectrons produced by the VUV photons being collected at a grid close to the photocathode. However, this new detector displayed several limitations: low detection e ciency for high energy radiation (above 50 keV); small solid angle subtended by the photosensor; and the high bias voltage needed, which reduced its performance and its application scope. So, to solve these limitations a new detector for higher energies (100-662 keV) was developed using a cylindrical geometry, which is expected to display several advantages. On one hand, the cylindrical con guration allows the number of metallic grids used to be decreased, thus reducing the impact of the internal optical transmission in the detector gain. In addition, the fact that the photocathode is deposited on the inner surface of the detector walls signi cantly increases the solid angle subtended by the photosensor, improving the gain. Also because the radiation is absorbed along the cylinder axis, the detecting e ciency is improved. Moreover, this con guration will, in principle, allow the bias voltage to be minimized for the same gain when compared with the planar geometry. In this work, this new prototype was designed according to the initial performance requirements, constructed and assembled, followed by its characterization with the assessment of the prototype performance using an alpha particle source of 241Am, varying the pressure from 1 up to 3 bar. In the initial stage, the characterization of the 241Am source was performed, followed by the study of the charge collection at the anode and the characterization of the scintillation signal. In this study, it was possible to verify that increasing the E=p above the ionization threshold at the anode surface and slightly above the scintillation one in the collecting region, the energy resolution was improved. In addition, the gain and the signal-to-noise ratio (SNR) of the detector were also determined. Regarding the gain, the experimental values determined were in agreement with the theoretical ones, and at the best possible conditions we were able to reach a gain of 1.9 at 1.05 bar, which gives a good outlook for achieving gains of about 30 at 15 bar. As for the SNR, in the best possible conditions studied, the signal was 10 times greater than the noise, which allowed the minimum detectable energy to be estimated with the detector in the present operating conditions. In parallel with the development of this new detector, the transport properties of ions were also studied to provide information on ion mobility for di erent gas mixtures used or considered for several major experiments (ALICE TPC and TRD, CBM TRD, Next and the future LCTPC), as the information of the mobility of ions in gases is relevant not only for the design and modelling of gaseous radiation detectors, but also in the understanding of the signal formation. This work was developed in the scope of our participation in the NEXT Collaboration and RD51 Collaboration from CERN. The ion drift chamber used in these studies, already available in our laboratory, allows the drift time of this group of ions to be determined with precision and consequently their drift velocity and mobility. Finally, knowing the mobility of these ions and using Blanc's law with the polarization limit of the Langevin's formula, it is possible to identify most of the collected ions. In the scope of this thesis, 5 gas mixtures of interest for the above-mentioned experiments were studied: Xe-N2, Xe-CO2, Xe-CF4, Ar-C2H6 and Ar-CH4. Another interesting result coming from this work is related to the validity of the Langevin polarization formula used to predict the mobility of ions and whose limitations are related to the weak polarizability of some neutrals such as Ne, or by the numerous internal degrees of freedom, responsible for reducing the mobility in gases such as CO2 by about 10%. An alternative method to the use of the Langevin polarization limit, when it fails, is proposed, which will allow a better estimate of the mobility to be obtained.
Esta tese apresenta os estudos realizados com o objectivo de desenvolver e testar um detetor gasoso do tipo contador gasoso de cintilação proporcional (CGCP) baseado em Xe a alta pressão (5-20 bar) com geometria cilíndrica para a detecção de raios-X duros e de radiação gama (100-662 keV), para utilização em ambientes hostis em que a robustez é um requisito, por exemplo em segurança nacional (detecção de transporte ilegal de material radioativo) ou em instrumentação para prospecção geológica. Apresenta também o estudo realizado relativamente às propriedades de transporte de iões em meios gasosos de interesse para detetores de grande volume. Nos CGCPs, a detecção da radiação ionizante assenta na produção de fotões de cintilação como estágio de ampli cação e sua posterior detecção com a ajuda de um fotosensor, geralmente um fotomultiplicador. Os CGCPs são constituídos por uma região de absorção/deriva onde a radiação ionizante é absorvida dando origem a uma nuvem de electrões primários que é guiada por um campo eléctrico baixo (abaixo do limiar de excitação do gás) em direcção à região de cintilação secundária onde, devido ao campo eléctrico mantido acima do limiar de excitação e abaixo do limiar de ionização do gás, são produzidos um elevado número de fotões de cintilação (fotões de VUV). Os fotões emitidos durante o processo de desexcitação dos átomos do meio irão atingir o fotosensor originando um sinal proporcional à energia da radiação incidente. Convencionalmente, a geometria adoptada é a geometria planar por ser a que apresenta a melhor resolução em energia, mas devido à utilização de fotosensores o seu uso em ambiente de campo e limitada. Recentemente foi desenvolvido um protótipo com geometria planar, mais robusto, tendo em vista esse tipo de aplicações, uma vez que utiliza como fotosensor um depósito de iodeto de césio, sendo a carga originada no mesmo pela incidência de fotões VUV, e recolhida numa grelha colocada na sua proximidade. Contudo, este detector revelou algumas limitações: baixa eficiência de detecção para radiação de energia acima de 50 keV, baixo ângulo sólido e elevada tensão de polarização necessária, que condicionam o seu desempenho e a sua gama de aplicações. Para resolver estas limitações foi desenvolvido um novo protótipo para detecção de radiação de energia mais elevada (100-662 keV), optando-se por uma geometria cilíndrica, que apresenta inúmeras vantagens. Por um lado, a con figuração cilíndrica permite diminuir o número de grelhas metálicas utilizadas no anterior protótipo, reduzindo o impacto da transmissão óptica interna no ganho do detector, e melhora signi ficativamente o ângulo sólido. Não menos importante e a melhoria que esta con figuração permite ao nível da e ficiência de detecção, já que nesta geometria a radiação é absorvida ao longo do eixo principal do detector. Também diminui signi ficativamente a tensão de polarização quando comparado com a geometria planar. Depois de um estudo preliminar, o detector foi projetado construído e montado, tendo sido feita a caracterização preliminar do mesmo, à qual se seguiu a veri ficação do seu desempenho com o recurso a uma fonte de partículas alfa de 241Am, para pressões entre 1 a 3 bar. Numa primeira fase, foi feita a caracterização da fonte de 241Am utilizada nos testes, à qual se seguiu o estudo da carga primária recolhida no ânodo, seguindo-se a caracterização do sinal de cintilação. Com este estudo foi possível veri ficar que aumentando o E/p para valores acima do limiar de ionização à superfície do ânodo e ligeiramente acima do limiar de excitação a resolução em energia do detector na região de recolha poderia ser melhorada. Neste trabalho foram ainda estudados o ganho e a relação sinal-ruído (SNR) do detector. Em relação ao ganho, o comportamento observado era o o esperado teoricamente, sendo que nas melhores condições possíveis foi obtido um ganho de 1.9 a 1.05 bar o que nos dá boas perspectivas para alcançar ganhos na ordem de 30 para pressões de 15 bar. Já em relação à SNR, nas melhores condições possíveis, o sinal observado foi 10 vezes superior ao ruído, o que permitiu estimar a energia mínima detetável nestas condições de operação. Em paralelo com o desenvolvimento deste novo detector, foi estudada a mobilidade de iões em diferentes misturas gasosas de interesse ou utilizadas em diversas experiências de grande relevância (ALICE TPC e TRD, CBM TRD, NEXT TPC e a futura LCTPC), uma vez que a informação sobre a mobilidade de iões é relevante não só para o desenho e modelação de detectores, mas também para a compreensão da formação dos impulsos gerados. Este trabalho foi desenvolvido no âmbito da nossa participação na colaboração NEXT e RD51 do CERN. A câmara de deriva de iões positivos utilizada nestes estudos, já existente no laboratório, permite determinar com precisão o tempo de deriva deste grupo de iões e consequentemente a sua velocidade de deriva e mobilidade. Determinada a mobilidade destes iões e utilizando a Lei de Blanc e o limite de polarização de Langevin é possível efectuar a sua identi ficação. No âmbito desta tese foram feitos estudos relativos a cinco misturas com interesse para as experiências mencionadas: Xe-N2, Xe-CO2, Xe-CF4, Ar-C2H6 and Ar-CH4. Neste estudo foi também veri ficada a validade do limite de polarização de Langevin para a estimativa da mobilidade de iões, tendo-se concluído que as suas limitações estão relacionadas essencialmente com a fraca polarizabilidade dos átomos ou moléculas envolvidos como é o caso do Ne, ou pela presença de inúmeros graus de liberdade internos nas mesmas que são responsáveis por reduzir a mobilidade em cerca de 10% em casos como o do dióxido de carbono, CO2. Esta informação torna-se especialmente relevante pois a introdução de correcções permite obter melhores estimativas para a mobilidade em casos onde não existem medidas experimentais.
"Studies on high-pressure magnetron sputtering plasmas using laser-aided diagnostic techniques." Thesis, 2008. http://hdl.handle.net/2237/9685.
Повний текст джерелаBin, Nayan Nafarizal. "Studies on high-pressure magnetron sputtering plasmas using laser-aided diagnostic techniques." Thesis, 2008. http://hdl.handle.net/2237/9685.
Повний текст джерелаNovikov, Dmitri V. "Pressure treatment of polytene chromosomes and computer vision techniques for high resolution cytogenetic studies /." 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3314860.
Повний текст джерелаSource: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 2742. Adviser: Andrew Belmont. Includes bibliographical references (leaves 42-47) Available on microfilm from Pro Quest Information and Learning.
MALONE, PATRICK VERNON. "HIGH-PRESSURE/HIGH-TEMPERATURE GAS-SOLUBILITY STUDY IN HYDROGEN-PHENANTHRENE AND METHANE-PHENANTHRENE SYSTEMS USING STATIC AND CHROMATOGRAPHIC TECHNIQUES." Thesis, 1987. http://hdl.handle.net/1911/16092.
Повний текст джерелаSaouane, Sofiane. "Extending the Search Space for Novel Physical Forms of Pharmaceuticals and Biomolecules using High-Pressure Techniques." Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0028-878A-D.
Повний текст джерела(6717671), Robert Z. Zhang. "Analysis Techniques for Characterizing High Power Turbulent Swirl Flames." Thesis, 2019.
Знайти повний текст джерела"The Study on Work Pressure and Coping Strategies of Junior High School Natural Science and Life Techniques Teachers." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0021-2004200716161771.
Повний текст джерела許總智. "The Study on Work Pressure and Coping Strategies of Junior High School Natural Science and Life Techniques Teachers." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/44463978260406976925.
Повний текст джерела國立臺灣師範大學
工業教育學系在職進修碩士班
94
This study aims at exploring the work pressure and coping strategies of junior high school natural science and life techniques teachers particularly in the curriculum for Grades 1 to 9 and further exploring the relations between the work pressure and the coping strategies. This study adapts questionnaire survey and conducts it by taking as the population the natural science and life techniques teachers in junior high schools in the region including three counties: Hsinchu, Miaoli, and Taoyuan, and one city – Hsinchu City. 497 valid questionnaires were collected back from 800 teachers as the population thus created a valid rate of 62.1%. This study analyzes and tests the questionnaire results by making use of statistical methods such as Frequency Distribution, Percentage, Mean, Standard Deviation, Independent-Sample t Test, One-Way Analysis of Variance and Scheffé Method – Post Hoc Comparison and comes to the conclusions as the follows: 1. In terms of work pressure for the junior high school natural science and life techniques teachers from implementing the curriculum for Grades 1 to 9, the pressure value demonstrates to be moderate to high, and among others the pressure from “teaching activities” is the highest while that from “curriculum design” the lowest. 2. In terms of application frequency of coping strategies against work pressure, from implementing the curriculum for Grades 1 to 9 for the junior high school natural science and life techniques teachers, the frequency result demonstrate to be above mean value, and among all strategies “Problem-solving” strategy is of the highest frequency while “Emotion Reducing” strategy the lowest frequency. 3. In terms of perception affecting factors to the work pressure for the junior high school natural science and life techniques teachers, such as gender, post, workshop hours, teaching pattern, scale of school, school campus location, the overall measure demonstrates the female teachers perceive higher work pressure than the male teachers do; “teachers with second post in administration” perceive higher work pressure than “teachers with second post in class teacher”; teachers “with workshop hours over 40 hours” perceive apparently much higher work pressure than those “with workshop hours below 40 hours”, the main reason could be teachers’ own responsibility for class arrangement.teachers “teaching general studies” perceive higher work pressure than those “teaching specific study”; science teachers with “24 or less classes” load perceives higher work pressure than those with “61 plus classes” load; and finally teachers working in “the school in rural area” perceive higher work pressure than those working in “the school in urban area” do. 4. In terms of work pressure coping strategy, the strategies vary to the teacher’s gender, post, expertise, teaching method and school campus locations. Female teachers demonstrate a higher application frequency of coping strategies than male teachers do; “specific subject teachers” demonstrate a higher application frequency of coping strategies than “the teachers with second post in administration”; teachers teaching “biology” demonstrate a higher application frequency of coping strategies than the teachers teaching “computer science”; teachers “teaching general studies” demonstrate higher application frequency of copy strategy than those “teaching specific study”; teachers working in school located in “urban” or “township” demonstrate higher application frequency of copy strategy than those working in schools in “rural area”. 5. In terms of difference in coping strategies, the intensity of perception of work pressure or the junior high school natural science and life techniques teachers from implementing the curriculum for Grades 1 to 9, teachers under higher work pressure demon strate coping strategy more freuently then those who under lower work pressure, has resulted in obvious difference in work pressure coping strategies. At last this study tries to offer some suggestions, for reference purpose, to the educational authorities, school administration units, natural science teachers of junior high schools and the researchers interested in this domain in the coming future.
Olsen, Lawrence Robert. "The defect chemistry and diffusion of fluoride interstitials in Eu³⁺ doped CaF₂ studied with site selective spectroscopy and high pressure techniques." 1995. http://catalog.hathitrust.org/api/volumes/oclc/34332428.html.
Повний текст джерелаTypescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 174-176).
AMARU', Fabio. "Multimodal techniques for biomedical image processing." Doctoral thesis, 2014. http://hdl.handle.net/11562/693559.
Повний текст джерелаThe PhD work involved three main biomedical research areas. In the first, we aimed at assessing whether T1 relaxometry measurements may help identifying structural predictors of mild cognitive impairments in patients with relapsing-remitting multiple sclerosis. Twenty-nine healthy controls and forty-nine RRMS patients underwent at high resolution 3T magnetic resonance imaging to obtain optimal cortical and white matter lesion count/volume as well as T1 relaxation times (rt). In WML and CL type I (mixed white-gray matter), T1 rt z-scores were significantly longer than in HC tissue (p<0.001 and p<0.01 respectively), indicating loss of structure. Multivariate analysis revealed T1 rt z-scores in CL type I were independent predictors of long term retrieval (p=0.01), T1 z-score relaxation time in white matter cortical lesions were independent predictors of sustained attention and information processing (p=0.02); In the second, we describe a biomagnetic susceptometer at room-temperature to quantify liver iron overload. By electronically modulated magnetic field, the magnetic system measure magnetic signal 108 times weaker than field applied. The mechanical noise of room-temperature susceptometer is cancelled and thermal drift is monitored by an automatic balance control system. We have tested and calibrated the system using cylindrical phantom filled with hexahydrated iron II choloride solution, obtaining the correlation (R=0.98) of the maximum variation in the responses of the susceptometer. These measures indicate that the acquisition time must be less than 8 seconds to guarantee an output signal variability to about 4-5%, equal to 500ugr/grwet of iron. In the third, a 3D anatomically detailed finite element analysis human foot model is final results of density segmentation 3D reconstruction techiniques applied in Computed Tomography(CT) scan DICOM standard images in conjunctions with 3D finite element analysis(FEA) modeling. In this model the real morphology of plantar fat pad has been considered: it was shown to play a very important role during the contact with the ground. To obtain the experimental data to compare the predictions of 3D foot model, a posturography static examination test on a baropodometric platform has been carried. The experimental plantar contact pressure is, qualitatively, comparable with FEA predicted results, nominally, the peak pressure value zones at the centre heel region and beneath the metatarsal heads.