Tesi sul tema "Compression effect"
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Alkharabsheh, Khaled S. "Image compression and its effect on data". Huntington, WV : [Marshall University Libraries], 2004. http://www.marshall.edu/etd/descript.asp?ref=462.
Testo completoGan, Khong Wui. "Effect of high through-thickness compression on composite failure". Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616885.
Testo completoRagan, Paula Marie. "The effect of mechanical compression on chondrocyte gene expression". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85347.
Testo completoIncludes bibliographical references (leaves 115-122).
by Paula M. Ragan.
Ph.D.
Talal, Sina. "Effect of long-term compression on rigid polymer foams". Thesis, Kingston University, 1999. http://eprints.kingston.ac.uk/20640/.
Testo completoThorp, George. "The Effect of Compression Recovery Pants on Cycling Performance". University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1430470588.
Testo completoComstedt, Erik. "Effect of additional compression features on h.264 surveillance video". Thesis, Mittuniversitetet, Avdelningen för informationssystem och -teknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-30901.
Testo completoWaizmann, Tabea. "The effect of compression and expansion on stochastic reaction networks". Thesis, IMT Alti Studi Lucca, 2021. http://e-theses.imtlucca.it/335/1/Waizmann_phdthesis.pdf.
Testo completoNdebele, Nothando Elizabeth. "Clustering algorithms and their effect on edge preservation in image compression". Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1008210.
Testo completoShi, Lu-Feng. "Effect of dynamic compression characteristics on aided perception of reverberant speech". Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2006. http://proquest.umi.com/login?COPT=REJTPTU0NWQmSU5UPTAmVkVSPTI=&clientId=3739.
Testo completoMcDonald, G. J. "Optical sampling and metrology using a soliton-effect compression pulse source". Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/19219/.
Testo completoSabrina, Irene. "Effect of the Manual Ischemic Compression on the Biological Movement Kinematic". Thesis, Högskolan Dalarna, Institutionen för information och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:du-38053.
Testo completoLu, Tran Diem T. (Trinh). "The effect of auditors’ workload pressure and compression on audit quality". Master's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201605121710.
Testo completoBateman, Simon David. "The effect of speed of compression on the properties of compacts". Thesis, Liverpool John Moores University, 1988. http://researchonline.ljmu.ac.uk/4892/.
Testo completoMango, Omar I. K. "The effect of design parameters of compressors on the performance of domestic refrigerators". Thesis, University of Hertfordshire, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259540.
Testo completoSun, Zuwen. "Effect of Photoacoustic Radar Chirp Parameters on Profilometric Information". Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37116.
Testo completoNakano, Tamon. "Étude numérique de l’interaction choc/couche limite en géométrie de révolution". Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2018. http://www.theses.fr/2018ESMA0013/document.
Testo completoShock wave/boundary layer interactions (SWBLI) are present in various aerospace engineering applications.They can be associated with separated regions yielding low-frequency unsteadiness, which have mainly been studied in planar geometries. The present study aims at characterizing this type of interaction in a cylindrical configuration. A direct numerical simulation solver has been developed and validated with various test cases. It is based on a high-order finite difference based hybrid schemes (6th order centered scheme/5thorder WENO), extended to curvilinear geometries. Transverse curvature effects on properties of spatially developing supersonic boundary layer at Mach 3 are first examined. It is shown that the increase of the relative curvature of the boundary layer tends to reduce the fluctuation energy at lower frequencies near the wall, while reinforcing the perturbations at higher frequencies in the upper zone of the boundary layer.In comparison with the planar case, the transverse curvature leads to a significant re-organization of the boundary layer structures and a subsequent modified behavior of the invariants of anisotropy turbulent stress tensor. It however only leads to slightly modified distributions of Reynolds stress and a rather similar overall balance of turbulent kinetic energy through the boundary layer. The second part of this study is dedicated to the unsteady motions of the shock/separation zone in a cylinder/compression flare configuration for which the full cylindrical geometry is taken into account. The shock distortions in the azimutal direction appears to be mainly associated to the organization of the upstream vortex structures and the subsequent azimutal fluctuations of the separation line. It is shown that the energy of the fluctuating wall pressure is more amplified for higher order azimutal modes. The contributions to lateral forces, associated to the first mode, are dominated by low-frequencies only upstream of the separation line in the intermittent region. They become more dominant in the middle frequency range downstream of the reattachment zone on the ramp. It is also shown that the low-frequency activity at the wall is progressively due to higher order azimuthal modes through the interaction zone
Van, Heyningen Martha Catharina. "Investigating the effect of compression on the permeability of fibrous porous media". Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86245.
Testo completoENGLISH ABSTRACT: Fluid flow through porous media plays an important role in a variety of contexts of which filtration is one. Filtration efficiency of fibrous filters depends on the micro-structural characterization of these porous materials and is reflected in the permeability there-of. Compression of fibrous porous media has a significant effect on the permeability. Experimental data indicate that the permeability varies generally with more than an order of magnitude over the narrow porosity range in which the compression takes place. Relative to the amount of experimental studies regarding this phenomenon, there is a scarcity of geometric models in the literature that can account for the effect of compression on the permeability of a fibrous porous medium. Within the context of existing geometric porescale models based on rectangular geometry, a new model is presented and an existing model improved to predict the effect of one-dimensional compression in the streamwise direction. In addition, without compromising on a commitment to mathematical simplicity, empirical data of a non-woven fibrous porous medium was used to highlight the effect of model geometry on its predictive capability. Different mathematical expressions for the relationship between compression and porosity were considered. The permeability is expressed explicitly in terms of the fibre diameter and the compression fraction and implicitly in terms of the porosity. The porosity is incorporated through the relationship between the linear dimensions of the geometric model. The general applicability of the model(s) was validated by making use of data on airflow through a soft fibrous porous material as well as through glass and nylon fibres. The permeability predictions fall within the same order of magnitude as the experimental data. Given the mathematical simplicity of the model(s), the prediction capability is satisfactory. Attention is drawn to assumptions made and model restrictions within the analytical modelling procedure. A general predictive equation is presented for the permeability prediction in which a solid distribution factor is introduced. The proposed models serve as basis for further adaptation and refinement towards prediction capability.
AFRIKAANSE OPSOMMING: Vloei van vloeistowwe deur poreuse media speel ’n belangrike rol in ’n verskeidenheid kontekste waarvan filtrasie een is. Die filtrasie doeltreffendheid van vesel filters hang af van die mikro-strukturele karakterisering van hierdie poreuse materiale en word gereflekteer in die permeabiliteit. Kompressie van veselagtige poreuse media het ’n beduidende effek op die permeabiliteit. Eksperimentele data dui aan dat die verandering in permeabiliteit gewoonlik oor meer as ’n orde grootte strek oor die klein porositeitsinterval waarin die kompressie plaasvind. Relatief tot die aantal eksperimentele studies rakende hierdie verskynsel, is daar ’n tekort aan geometriese modelle in die literatuur wat die effek van kompressie op die permeabiliteit van veselagtige poreuse media in ag kan neem. Binne die konteks van bestaande geometriese kanaal-skaal modelle gebasseer op reghoekige geometrie, is ’n nuwe model voorgestel en ’n bestaande model verbeter om die effek van een-dimensionele kompressie in die stroomsgewyse rigting te voorspel. Sonder om die verbintenis tot wiskundige eenvoud prys te gee, is empiriese data van ’n nie-geweefde veselagtige poreuse medium gebruik om die effek van die geometrie van ’n model op sy voorspellingsvermo¨e uit te lig. Verskillende wiskundige uitdrukkings is oorweeg vir die verband tussen kompressie en porositeit. Die permeabiliteit is eksplisiet uitgedruk in terme van die veseldiameter en die kompressie breukdeel en implisiet in terme van die porositeit. Die porositeit is ge-inkorporeer deur die verhouding tussen die lineêre dimensies van die geometriese model. Die algemene toepaslikheid van die model(le) is gestaaf deur gebruik te maak van data oor lugvloei deur ’n sagte veselagtige poreuse materiaal sowel as deur glas en nylon vesels. Die voorspellings van die permeabiliteit val binne dieselfde groote orde as die eksperimentele data. Gegee die wiskundige eenvoud van die model(le), is die voorspellingsvermoë bevredigend. Aandag is gevestig op aannames wat gemaak is en modelbeperkings binne die analitiese modellerings prosedure. ’n Algemene voorspellingsvergelyking is voorgestel vir die voorspelling van die permeabiliteit waarin ’n vaste stof distribusie faktor geinkorporeer is. Die voorgestelde modelle dien as basis vir verdere aanpassing en verfyning van voorspellingsvermoë.
Sweeney, Benjamin Andrew. "The Effect of Biocomposite Material In A Composite Structure Under Compression Loading". DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1932.
Testo completoHartley, R. S. "Assessing the effect of friction on compression split Hopkinson pressure bar tests". Master's thesis, University of Cape Town, 2004. http://hdl.handle.net/11427/19571.
Testo completoCambridge, Shevonn Nathaniel. "The effect of compression ratio on emissions from an alcohol-fueled engine". Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09122009-040220/.
Testo completoSchwartz, Andrew H. "Effect of dynamic range compression on attending to sounds based on spatial location". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/84411.
Testo completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 118-125).
Many hearing aids introduce nonlinear compressive gain to accommodate the reduced dynamic range that often accompanies hearing loss. Unfortunately, when applied independently at either ear, this gain can introduce fluctuations in interaural level difference (ILD), which is an important cue for spatial perception and attending to sounds in an acoustic mixture. Moreover, natural sounds produce complicated interactions between different sounds in a mixture, as a compressor's gain is driven by whichever source dominates the mixture within a specified temporal window. While independent compression can interfere with spatial perception of sound, it does not always interfere with localization accuracy or speech identification. This thesis investigates the role of dynamic range compression on the ability to attend to target speech in the presence of interfering speech. First, the fundamental concepts behind dynamic range compression and its use are introduced, and used to develop a framework to understand some of the possible effects on ILD and spatial perception. This framework is applied toward the interpretation of the existing literature regarding dynamic range compression and spatial perception, bringing together a seemingly contradictory range of results. In particular, the framework presented here predicts that dynamic range compression will only affect performance in tasks for which relatively small spatial separations are tested, whereas many existing studies compare only large spatial separations to no spatial separation. We describe and analyze the results of an experiment designed to test this prediction by systematically varying the spatial separation between different speech sources that normal-hearing listeners attended to. We found a robust but modest detrimental effect of dynamic range compression on listeners' performance. Linking the left and right compressors so that ILD was unaltered restored performance. Lastly, we develop a model to describe the utility of ILD for such tasks. The results of this model provide insight into the reported behavioral results, and generate predictions for how hearing impairment may alter the observed pattern of results.
by Andrew H. Schwartz.
Ph.D.in Speech and Hearing Bioscience and Technology
Grobler, Lara. "The effect of graduated compression socks on calf muscle oxygenation of endurance athletes". Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71677.
Testo completoENGLISH ABSTRACT: Compression socks (CS) are used as an ergogenic aid during and after exercise by many athletes of elite and recreational status. The exact mechanism whereby CS affect performance and postexercise recovery is not yet elucidated. Some research ascribes the beneficial effects to improved lactate removal rates with CS. One hypothesis is that CS improve venous return and thereby remove the lactate from the tissue to other tissues such as the liver, and the second hypothesis is that the CS cause retention of the lactate within the muscle and therefore improve the oxidation of the lactate within the muscle (Berry & McMurray, 1987). The current study endeavoured to test the hypothesis set by Berry and McMurray (1987) by measuring the effect of CS as well as flight socks (FS) on muscle oxygenation during exercise and recovery in endurance trained runners and triathletes. Eleven male endurance trained runners and triathletes (age = 34.8 ± 3.8 years, VO2max = 52.4 ± 7.1 mL.kg-1.min-1) participated in the study. They completed an incremental exercise test to exhaustion to determine their maximal aerobic capacity (VO2max) and peak treadmill velocity (PTV). Then they completed two 10 km treadmill running tests at 80 % of their PTV. During these two trials participants wore either CS or FS; the order of treatment was randomly selected. A subset of the study sample (n = 5) also completed a control test wearing only their ankle length sport socks (NS). After these trials, participants completed a 60 minute passive recovery period in the seated position while muscle oxygenation was measured. Compression under the socks was measured at several anatomically determined measurement points prior to the commencement of the exercise test, along with the determination of blood haemoglobin concentration ([Hb]). During the exercise trials, blood lactate concentration ([BLa]), skin temperature (ST),oxygen consumption (VO2), carbon dioxide production (VCO2), heart rate (HR), and muscle oxygenation variables (oxy-haemoglobin (O2Hb), deoxy-haemoglobin (HHb), tissue oxygenation index (TOI) and total haemoglobin index (nTHI)) was measured . During the 60minute passive recovery period, [BLa], ST, O2Hb, HHb, TOI, and nTHI measurements were continued. The results showed that there were differences in the pressure exerted between the two pressure condition (CS and FS) at the posterior ankle, and under the elastic of the sock as well as on the anterior calf at the level of greatest calf circumference. Differences in ST between the CS and NS and the FS and NS conditions were found between the first four 2 km intervals of the exercise protocol, but not during recovery. No differences were found in [BLa] between the three different compression conditions during either the exercise (p = 0.19) or recovery period (p = 0.63), as well as no differences in the cardiorespiratory variables during exercise between the three different compression conditions (VO2, p = 0.06; VCO2, p = 0.12; HR, p = 0.36). With regard to the muscle oxygenation variables, no differences were found between the three compression conditions during exercise, however there was a trend for lower oxygen utilization (HHb) during exercise in the NS condition (p = 0.57, medium to large practical significance). There were also no differences in these variables (O2Hb, p = 0.65; HHb, p = 0.57; TOI, p = 0.39; nTHI, p = 0.22) during recovery, although oxygen utilization (HHb) showed a faster recovery rate with increasing external pressure. From the results obtained, it seems that external compression caused a decrease in the blood flow velocity within the muscle, thereby increasing oxygen diffusion rate. During exercise this did not facilitate differences in [BLa], however, after the first 10 minutes of the recovery period, large practical differences were found between the NS and both sock conditions, suggesting that the increase in oxygen diffusion improved lactate clearance. This could support the hypothesis set by Berry and McMurray (1987).
AFRIKAANSE OPSOMMING: Kompressie sokkies (CS) word gereeld deur beide rekreasie- en elite atlete gebruik as ‘n ergogeniese hulpmiddlel tydens oefening en herstel. Die presiese meganisme waardeur CS prestasie en post-oefening herstel beïnvloed is nog nie volledig verklaar nie. Sommige navorsing skryf die voordelige effekte toe aan die vinniger herstel van laktaat in die sirkulasie. Daar is tans twee hipoteses vir die meganisme waardeur CS laktaat verwydering verbeter. Die eerste hipotese is dat CS die veneuse terugvoer verbeter en daardeur die laktaat van die weefsel verwyder en na ander weefsels soos die lewer vervoer vir verwydering. Die tweede hipotese is dat CS veroorsaak dat die laktaat in die spierweefsel teruggehou word wat dan tot gevolg het dat die laktaat in die spier self deur middel van oksidasie verwyder word (Berry & McMurray, 1987). Hierdie studie poog om Berry en McMurray (1987) se hipotese te toets deur die effek wat CS sowel as vlugsokkies (FS) op spieroksigenasie het gedurende oefening en herstel in geoefende uithouvermoë hardlopers en driekamp atlete vas te stel. Elf ingeoefende langafstand hardlopers en driekampatlete (mans) (ouderdom = 34.8 ± 3.8 jaar; VO2maks = 52.4 ± 7.1 mL.kg-1.min-1) het aan hierdie studie deel geneem. Die deelnemers het ‘n inkrementele toets tot die punt van uitputting voltooi om hul maksimale aërobiese kapasiteit (VO2maks) en piek trapmeul snelheid (PTV) vas te stel. Die elf deelnemers het ook twee 10 km hardlooptoetse teen 80 % van hul PTV voltooi. Gedurende hierdie twee toetse het die deelnemers óf CS óf FS gedra; die volgorde van die intervensie was lukraak aan hulle toegeken. ‘n Subgroep van die steekproef (n = 5) het ook ‘n kontrole toets voltooi waartydens hulle hul eie enkelhoogte sport sokkies (NS) gedra het. Aan die einde van die hardloop protokol het die deelnemers ‘n 60 minuut passiewe herstel periode in die sittende posisie voltooi terwyl spieroksigenasie gemeet is. Kompressie onder die sokkies is voor die aanvang van die hardloop protokol by verskeie anatomies gedefinieerde punte gemeet. Verder was die bloed hemoglobien konsentrasie ([Hb]) ook gemeet voor die hardloop protokol. Tydens die oefeningtoets is bloedlaktaat konsentrasie ([Hb]), veltemperatuur (ST), suurstof verbruik (VO2), koolstofdioksied produksie (VCO2), harttempo (HR), sowel as spieroksigenasie veranderlikes (oksi-hemoglobien (O2Hb), deoksi-hemoglobien (HHb), weefsel oksigenasie indeks (TOI), en totale hemoglobien indeks (nTHI)) gemeet. Gedurende die 60 minuut passiewe hersteltydperk is [BLa], ST, O2Hb, HHb, TOI en nTHI metings geneem. Die resultate toon dat daar ‘n verskil is in die druk wat uitgeoefen word in die onderskeie druktoestande (CS en FS) op die been by die posterior enkel en onder die rek van die sokkie, sowel as op die anterior kuit waar die kuit die grootste omtrek het. Verdere verskille tussen die CS en NS en die FS en NS toestande is in ST gevind in the eerste vier 2 km intervalle van die oefeningtoets, alhoewel geen verskille tydens die herstelperiode gevind is nie. Tydens beide die oefening (p = 0.19) en herstel (p = 0.63) protokol is geen verskille tussen die drie kompressie toestande met betrekking tot [BLa] gevind nie. En so ook is daar geen verskille tussen die onderskeie kompressie toestande in kardiorespiratoriese veranderlikes (VO2, p = 0.06; VCO2, p = 0.12; HR, p = 0.36) tydens oefening gevind nie. Met betrekking tot spieroksigenasie veranderlikes was daar geen verskil gevind tussen die drie kompressietoestande gedurende oefening nie, alhoewel daar ‘n tendens was vir die NS toestand om tydens oefening minder suurstofverbruik (HHb) (p = 0.57, medium tot groot praktiese effek) te lewer. So ook gedurende herstel is daar geen verskil in hierdie veranderlikes (O2Hb, p = 0.65; HHb, p = 0.57; TOI, p = 0.39; nTHI, p = 0.22) gevind nie, alhoewel die suurstofverbruik (HHb) vinniger na die basislyn herstel het met ‘n toename in druk. Die resultate toon dat eksterne kompressie ‘n afname in die bloedvloei tempo in die spier veroorsaak wat dan ‘n verlengde suurstof diffusie tyd veroorsaak. Hierdie verlengde suurstof diffusie tyd het geen effek op [BLa] tydens oefening gehad nie, alhoewel daar na die eerste 10 minute van die herstelperiode ‘n groot praktiese verskil tussen die NS en sokkie toestande gevind was in [BLa]. Hierdie verskil kan daarop dui dat die toename in suurstof diffusie verbeterde laktaat verwydering tot gevolg het, wat dan die hipotese van Berry en McMurray (1987) ondersteun.
Kirk, Linda S. "The effect of gap size on performance of metal plated joints in compression". Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53170.
Testo completoMaster of Science
Eyre, Michael Reese Kaczor Nancy Ann. "The effect of flexographic printing on the compression strength of corrugated shipping containers /". Online version of thesis, 1990. http://hdl.handle.net/1850/11178.
Testo completoLight, K., e Earl E. Johnson. "The Effect of Varying Amounts of Nonlinear Frequency Compression on Amplified Sound Quality". Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etsu-works/1756.
Testo completoBree, Carsten. "Self-compression of intense optical pulses and the filamentary regime of nonlinear optics". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://dx.doi.org/10.18452/16430.
Testo completoThis thesis discusses femtosecond filaments in dispersive dielectric media. In particular, the generation of intense, few-cycle optical pulses due to self-compression in noble gases is analyzed from a theoretical as well as from an experimental viewpoint, clearly isolating the physical mechanisms behind the observed pulse self-compression mechanism. To this end, numerical simulations of high-intensity femtosecond pulses propagating in noble gases were performed, and an analytical model of the processes leading to pulse self-compression was developed. Moreover, a theoretically predicted temporal self-healing property of femtosecond filaments is experimentally proven, demonstrating that few-cycle optical pulses can recover and even benefit from a temporary, non-adiabatic increase of dispersion and nonlinearity of the order of three magnitudes as experienced during the passage from a gaseous medium to a thin silica sample. Filamentation sets in at field strengths that approach the order of inner-atomic binding forces. At these extreme intensities, highly nonlinear effects such as multiphoton ionization or tunneling effects occur. Recent experimental investigations claim a prevalent contribution of a saturation of the optical Kerr effect in filamentation prior to the onset of Drude-contributions from ionization effects. This finding is currently controversially discussed in literature. In this thesis, an independent theoretical approach was pursued, estimating high-order contributions to the all-optical Kerr effect via a Kramers-Kronig transform of multiphoton absorption cross-sections. Quite surprisingly, while only based on first principles with some moderate approximations, the results of this analysis are in strong support of the recently suggested higher-order Kerr model.
Choi, Sangsook. "The effect of compression on speech perception as reflected by attention and intelligibility measures". [Lincoln, Neb. : University of Nebraska-Lincoln], 2004. http://www.unl.edu/libr/Dissertations/2004/ChoiDis.pdf.
Testo completoPDF text: [1] leaf abstract, v, 64 leaves dissertation : ill. (some col.). Site viewed on Jan. 25, 2005. Includes bibliographical references (leaves [65-70] of dissertation).
Gomez, Rafael. "The effect of social capital, salary compression and equity on individual and organizational performance". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0025/NQ49916.pdf.
Testo completoStadler, Daniel. "The effect of abdominal compression on UA function during sleep in healthy weight males /". Title page and abstract only, 2004. http://web4.library.adelaide.edu.au/theses/09SB/09sbs7771.pdf.
Testo completoNorthcutt, Sheri Lynn. "Effect of particle fabric on the one-dimensional compression response of Fraser River sand". Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/18162.
Testo completoAivaz, Balian Razmik. "The effect of compression ratio on the performance of a direct injection diesel engine". Thesis, Brunel University, 1990. http://bura.brunel.ac.uk/handle/2438/11249.
Testo completoSanderson, I. M. "The effect of formulation and maufacturing processes on the characterisitics of direct compression tablets". Thesis, University of Nottingham, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372670.
Testo completoAndreae, Morgan M. (Morgan MacKenzie). "Effect of ambient conditions and fuel properties on homogeneous charge compression ignition engine operation". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/35616.
Testo completoIncludes bibliographical references (p. 197-198).
Practical application of Homogeneous Charge Compression Ignition (HCCI) combustion must demonstrate robust responses to variations in environmental conditions. This work examines the impact of ambient conditions and fuel changes on HCCI engine operation, and evaluates cam phasing as a mechanism to compensate for these changes. Experiments were carried out on a modified 2.3 L 14 production engine, and HCCI operation was achieved by the use of residual trapping by negative valve overlap. The first phase of the project examined the impact of changes in intake air temperature and humidity on HCCI operation. Exhaust cam phasing was used to control load, and intake cam phasing was use to produce a change in combustion phasing. Cam timing control was largely able to compensate for changes in combustion due to changes in air temperature and humidity. Higher intake air temperature advanced combustion phasing and resulted in a 1 bar reduction of the net indicated mean effective pressure (NIMEP) at the high load limit for lower engine speeds. Intake air temperature did have more of an impact during lean operation. Higher intake air humidity delayed combustion phasing.
(cont.) During stoichiometric operation, this delay allowed a small extension (a few tenths of a bar in NIMEP) in the high load limit. During lean operation, the delay in combustion timing resulted in a reduction of the high load limit. The second phase of the project examined the impact of market fuel composition variations on HCCI operation. Twelve test fuels were created to vary the composition of 5 fuel properties: Research Octane Number (RON), Reid Vapor Pressure (RVP), olefin content, aromatic content, and ethanol content. The test fuels were blends of different commercial refinery streams and contained hundreds of different hydrocarbons to be representative market gasolines. Fuel type was found to have only a small impact on the HCCI operating range, and cam phasing was largely able to compensate for changes in fuel composition. The main effect of the different fuel composition appeared to be differences in ignition delay.
by Morgan M. Andreae.
Ph.D.
Baker, Matthew W. "Effect of Pallet Deckboard Stiffness and Unit Load Factors on Corrugated Box Compression Strength". Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/79367.
Testo completoPh. D.
Abdelkarim, Ahmad Ali. "Effect of JPEG2000 compression on landmark identification of lateral cephalometric digital radiographs a thesis /". San Antonio : UTHSC, 2008. http://learningobjects.library.uthscsa.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=57&CISOBOX=1&REC=16.
Testo completoWouts, Jérémy. "Étude et modélisation du comportement en compression du bois sous sollicitations d'impacts". Thesis, Valenciennes, 2017. http://www.theses.fr/2017VALE0025.
Testo completoWood is a natural cellular material, which is widely and advantageously used as shock absorber for the transport of radioactive materials. Accident situations are evaluated based on the 9 m drop test, which allows us to observe the complex crushing behavior of wood. A compressive experimental study is conducted on spruce and beech wood species over a large range of strain rates (from 0.001 to 600 s−1) to investigate the effect of the loading direction and of two extreme lateral confinements. The longitudinal direction is the most sensitive to the effect of strain rate and of lateral confinements which have significant consequences on the energy absorption. Besides, the experimental investigation can be adapted to various wood species with very different mechanical properties. A strain rate dependent elastoplastic model with transversal isotropy is developed using multi-scale and micromechanics techniques. The elastic macroscopic properties of wood are estimated with a Mori-Tanaka scheme and information extracted from the microstructure. The Gurson type criterion based on the micromechanical approach of the ductile damage is used in order to describe the non linear behavior of wood, its densification regime and its compressibility as well. Additionally, uncoupled degradation parameters are applied to reproduce the failure mechanisms involved in the longitudinal response. A simplified description of wood is used within the modeling and the numerical results exhibit the good ability of the model to reproduce the various wood responses during an accident situation
Baker, Christopher E. "The effect of transient dynamics of the internal combustion compression ring upon its tribological performance". Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14068.
Testo completoTranter, Thomas George. "A study of water management in polymer electrolyte fuel cells : compression effect on multiphase flow". Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/16086/.
Testo completoNagy, Caitlin Sandra. "EFFECT OF INTERMITTENT PNEUMATIC COMPRESSION (IPC) ON GLUCOSE REGULATION AND INFLAMMATION IN TYPE 2 DIABETES". Cleveland State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=csu1525784446631762.
Testo completoAlkhtany, Moshabab Mobarek H. "MODELING STRUCTURAL POLYMERIC FOAMS UNDER COMBINED CYCLIC COMPRESSION-SHEAR LOADING". University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1469532064.
Testo completoDunford, Jason Allen. "Development of an instrument to determine the effect of cyclic transverse compression on wood-pulp fibres". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0014/MQ52895.pdf.
Testo completoSt, Onge Paul Michael. "Effect of tissue compression on the Hoffmann reflex comparison between the ischial tuberosity and posterior thigh /". Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Dissertations/ST_ONGE_38.pdf.
Testo completoLafferty, Ian. "The effect of crystallisation variables on the powder characteristics, mechanical properties and compression behaviour of dextrose". Thesis, De Montfort University, 1998. http://hdl.handle.net/2086/4185.
Testo completoQuesenberry, Chandler Blake. "The Effect of Pallet Top Deck Stiffness on the Compression Strength of Asymmetrically Supported Corrugated Boxes". Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/104965.
Testo completoMaster of Science
Packaged products are primarily shipped as unit loads that consist of packaged products restrained to a platform, commonly a pallet. Paying particular attention to the design of the unit loads' components is necessary to safely ship products while still maintaining low packaging costs and sustainability initiatives. Stacking unit loads is a common practice to effectively use warehouse space, but warehouse stacking causes large amounts of weight for packaging to support. Pallets are not completely rigid and will deform because of this weight. The purpose of the study was to investigate the effect of pallet stiffness on the compression strength of corrugated boxes. Compression tests were completed on boxes supported by pallet designs having different deck stiffnesses. The top deck stiffness of a pallet was determined to have up to a 37% effect on the strength of corrugated boxes. Pressure data recorded between the bottom layer of boxes and the top deck of the pallet showed a larger percentage of pressure was located towards the outside edges of the unit load for boxes carried by a flexible pallet. Effectively, one side of the box was stressed more than the other causing package failure. Utilizing the effects of pallet top deck stiffness on box compression performance, a unit load cost analysis is presented showing that a stiffer pallet can be used to carry boxes with less board material; hence, it can reduce the total unit load packaging cost.
Phanthanousy, Samantha. "The Effect of the Stiffness of Unit Load Components on Pallet Deflection and Box Compression Strength". Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/86203.
Testo completoMaster of Science
Chomier, Mickael Thierry. "Effect of Vortex Roll-up and Crevice Mass Flow on Ignition in a Rapid Compression Machine". University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1374666527.
Testo completoLukyanets, Yuliya. "The Green and Ampt Infiltration Model Accounting for Air Compression and Air Counterflow in the Shallow Water Table Environment: Laboratory Experiments". Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3471.
Testo completoJenstad, Lorienne M. "The effect of temporal envelope changes on recognition of normal rate and time-compressed speech by young-old and old-old hearing-impaired listeners /". Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/8270.
Testo completoSwaminathan, Krishnakumar. "A quantitative proteomics study of the additive effect of inflammatory cytokines and injurious compression on cartilage damage". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67209.
Testo completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 103-123).
Objectives: 1) To perform a quantitative comparison of proteins released to media on combination with cytokine (IL-1[beta[ or TNF-[alpha]) and Injury as compared to either treatment alone, and to thus identify proteins which may be responsible for the synergism seen between cytokine and injury in causing catabolism of cartilage in vitro. 2) To identify proteins which contribute most to some commonly observed phenotypes on treatment of cartilage with cytokine or injury or both. Methods : Cartilage explants from calves were treated with (i)IL-1 (10 ng/ml), (ii)TNF[alpha] (100 ng/ml), (iii)Injurious compression (50% strain at 100%/sec) and IL-1[beta] (10 ng/ml) or (iv)Injurious compression (50% strain at 100%/sec) and TNF-[alpha](10 ng/ml), cultured for 5 days post treatment, and the pooled media collected, labeled with one of four iTRAQ labels and subjected to nano-2D-LC/MS/MS on a quadrupole time of flight instrument. Peptides were identified and quantified using Protein PilotTM, and MATLAB scripts used to obtain protein ratios. These results were analyzed using different statistical techniques. Data from two iTRAQ experiments were combined to generate data for all possible injury and cytokine treatment conditions, and proteins on which injury and cytokines acted synergistically identified. PLSR analysis was performed using Unscrambler®X software with the combined data set to determine which proteins are most relevant to some observed phenotypes. The phenotypes chosen were sGAG released to media in 5 days post treatment, proline and sulfate incorporation rates on day 6 post treatment, and nitrite accumulation in media in 5 days post treatment Results and Discussion: TNF-[alpha]+injury and IL-[beta] +injury treatment conditions show a very high correlation with each other. Most cytosolic, ER lumen and nuclear protein levels are highly elevated with both cytokine+injury conditions, while ECM proteins are either highly down regulated or marginally elevated. Many collagen telopeptides are down regulated, possibly indicating reduced anabolism. However, attempts at repair exist, as shown by increased levels of TGF-[beta] and activin A, and reduced levels of LTBP1. Also, biglycan and lumican, SLRPs known to be involved in early development are significantly increased, possibly indicating repair attempts. Other SLRPs such as PRELP and chondroadherin are also highly elevated, with one or both injury+cytokine treatments. While MMPs are mildly down regulated or remain the same, ADAMTS1 increases with TNF-a+injury, indicating increased catabolism. Among ECM structural proteins, COMP shows high down regulation with TNF-[alpha]+injury, possibly due to reduced synthesis. Proenkephalin, a signaling molecule possibly involved in tissue/repair and apoptosis, AIMPI, a multifunctional proapoptotic, inflammatory and pro-repair cytokine and Annexin A5, a protein indicating mineralization and apoptosis are all highly elevated with cytokine+injury indicating heightened apoptosis and/or repair. When results of two 4-plex iTRAQ experiments are combined to obtain data for all possible combinations of injury and cytokine, we again find a very high correlation between TNF-a+injury and IL-1 +injury (-95%), slightly higher than the correlation between TNF-[alpha] alone and IL-[beta] alone (-90%), and much higher than the correlation of either cytokine+injury condition with cytokine alone (-70%) or injury alone (-75%).
(cont.) This shows that IL-1[beta] and TNF-[alpha] in combination with injury act through very similar pathways in chondrocytes to produce their effect on cartilage tissue. TNF-a and injury were seen to act synergistically in a positive fashion on aggrecan, CILP-2, COL6A3 and histone H4, and in a negative fashion on SPARC and IGFBP7, suggesting that these proteins may be involved in causing synergism between injury and cytokine in releasing sGAG to the media. A PLSR analysis shows that SPARC and IGFBP7 project close to proline and sulfate incorporation, and far away from sGAG, indicating that SPARC and IGFBP7 may be proteins involved in anabolism. The highest phenotype-protein positive correlations obtained using PLSR are sGAG with Perlecan, SAA3, Complement factor B, CILP-2 and pleiotropin, indicating that all these 5 proteins are associated strongly with catabolism and can serve as markers of catabolism. The correlation of inflammatory proteins SAA3 and complement factor B with sGAG indicates the role of inflammation with catabolism. Conclusion: The combination of injury and cytokine affects tissue differently at a molecular level as compared to either chemical or mechanical stresses alone. Increased catabolism and increased attempts at tissue repair are observed due to a combination of injury and cytokine, and a combination of injury and cytokine may thus serve as a useful model to study OA in vitro.
by Krishnakumar Swaminathan.
S.M.
Mariola, Madison. "ACUTE EFFECT OF INTERMITTENT PNEUMATIC COMPRESSION (IPC) ON INFLAMMATION, CIRCULATION AND GLUCOSE REGULATION IN TYPE 2 DIABETICS". Cleveland State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=csu159259272116006.
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