Tesis sobre el tema "Contact parameters"
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Ozsahin, Orkun. "An Investigation On Dynamic Contact Parameters In Machining Center Spindle". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12610084/index.pdf.
Texto completoMcCloskey, Rosemary Martha. "Phylogenetic estimation of contact network parameters with approximate Bayesian computation". Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58663.
Texto completoScience, Faculty of
Graduate
Gestlöf, Rikard y Johannes Sörman. "Contact-free Cognitive Load Classification based on Psycho-Physiological Parameters". Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-44695.
Texto completoMcQuaid, Grainne. "Development of non-contact 3D measurement of areal pavement texture parameters". Thesis, Ulster University, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667769.
Texto completoKarim, Kh Nafis. "INTELLIGENT SYSTEM FOR MONITORING PHYSIOLOGICAL PARAMETERS USING CAMERA". Thesis, Mälardalens högskola, Inbyggda system, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-29834.
Texto completoJanakiraman, Venkatakrishna. "An Investigation of the Impact of Contact Parameters on the Wear Coefficient". The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366906387.
Texto completoDE, MELIS MIRKO. "Cardiovascular parameters for healthy state assessment: an optical-based, non contact approach". Doctoral thesis, Università Politecnica delle Marche, 2008. http://hdl.handle.net/11566/242581.
Texto completoFink, Barbara A. "Quantifying the effects of contact lens prescription parameters on human corneal oxygen uptake /". The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487331541709205.
Texto completoZhang, Yilei. "The effect of surface roughness parameters on contact and wettability of solid surfaces". [Ames, Iowa : Iowa State University], 2007.
Buscar texto completoMarchionni, Paolo y Paolo Marchionni. "Non-contact techniques for the measurement of physiological parameters in neonatal intensive care units". Doctoral thesis, Università Politecnica delle Marche, 2011. http://hdl.handle.net/11566/242484.
Texto completoThe main aim of this thesis is to design and develop novel measurement methods for the non-contact assessment of physiological quantities (oxygen saturation, heart rate, respiration rate and temperature) of importance in neonatal intensive care units (NICU). During the last decade, a growing interest on non-contact medical devices was testified by the literature; the reason is mainly due to the importance to eliminate the possible biological, chemical and electrical hazards always present when a medical device is used on a patient. This is particularly true on patients recovered in intensive care unit; especially if such patients are pre-born babies with low cardiac/respiration apparatus efficiency or reduced immunological defense systems. The work has been organized in order to explore and propose feasible solutions for the non-contact measurements of the following vital signs in pre-term patients: • Oxygen saturation (SaO2) • Heart rate (HR) • Respiration rate (RR) • Patient skin temperature (T) Oxygen saturation (SaO2) is typically affected by numerous fake values due to the non-optimal placement of the pulse oximeter or to movement artifacts. In chapter 4, a robust method for the rejection of the fake/erroneous values of SaO2 is described and implemented on 24 patient over 483 days period of time. More than 12% of erroneous data (equivalent to a 58 days period of time) have been individuated and rejected. Heart rate (HR) and respiration rate (RR) without any physical contact have been implemented on 8 patients maintained into thermal cribs or incubators. Data have been recorded, processed and compared with ECG and patient ventilator, showing an uncertainty of ± 43 ms and ± 150 ms. Finally a novel non-contact method for the measurement of the patient skin temperature (T) was designed and implemented for the use on NICU patients. An IR thermo-camera was used for determination of multi-point temperature determination with special attention on the indirect determination of thermogenesis and metabolic parameters of the patient. A specially devoted algorithm has been developed for the assessment and quantization of the patient parameters. The studied methods allow to perform the continuous and accurate measurement of important physiological parameters eliminating (a part from the pulse oxymeter) the contact between the patient and the medical devices and consequently reducing significantly the biological and electrical hazards risks which are particularly severe for NICU patients.
Casaccia, Sara. "Measurement of physiological parameters in the human body by non-contact technique: Laser Doppler Vibrometry". Doctoral thesis, Università Politecnica delle Marche, 2015. http://hdl.handle.net/11566/243056.
Texto completoThe measurements of physiological and vital signals without contact is a relevant research issue in modern biomedical instrumentation. Contact methods presently used to measure physiological parameters sometimes can be inconvenient or inadequate for patient comfort or to detect signals from particular body regions and the presence of cables is a limit for the patient mobility. For these reasons, the Laser Doppler Vibrometry (LDV) technique was introduced to acquire signals associated with biological activity in the human body, to avoid the contact with the skin and to make the tests easiest. This dissertation is focused on the novel use of LDV to measure cardiovascular and muscular activity to evaluate health and emotional state of participants. In fact, in daily and clinical practice is fundamental the assessment of vital and emotional signals and the LDV technique has the capability to measure the vibrational movements of the skin surface without contact, with a high sensitivity of acquisition and at a distance of several meters. In this work, the possibility to use LDV to measure the heart rate, with a deviation of ± 9 ms from the conventional gold standard method (electrocardiography) and other cardiovascular parameters assessed from the carotid artery are measured with LDV, will be explored and demonstrated. Finally, LDV is used to measure muscle contraction properties from the big and small muscles (facial muscles) with a high accuracy in confront of the gold standard method (surface electromyography). Using the non-contact LDV technique might provide surrogate measures for those obtained using conventional, more obtrusive assessment methods that require attached sensors and so, measurements of cardiovascular and muscular parameters without contact can improve tests as investigations, safety controls, clinical controls, rehabilitation programs.
Cunha, Alex Pereira da. "A method for measuring contact angle and influence of surface fluid parameters on the boiling heat transfer performance /". Ilha Solteira, 2019. http://hdl.handle.net/11449/183048.
Texto completoResumo: O avanço de novas tecnologias, associado à minimização dos custos de fabricação e instala-ção, constitui um grande desafio para a área de refrigeração, uma vez que a geração de calor tem aumentado gradativamente nos últimos anos. Assim, a busca de novos fluidos com pro-priedades térmicas superiores aos comumente usados tornou-se indispensável para melhorar a eficiência energética. Nas últimas décadas os nanofluidos - dispersões de partículas de escala nanométrica (1 a 100nm) em um fluido-base - têm atraído especial interesse não somente da comunidade acadêmica, mas também da indústria em áreas como: a microeletrônica, microflu-ídica, transporte, manufatura, assistência médica, entre outras. O melhor desempenho térmico e a vasta gama de aplicações fazem dos nanofluidos potenciais substitutos dos refrigerantes utilizados em diversos segmentos da engenharia. Dentro desse contexto, o presente trabalho teve como objetivos: o estudo teórico e experimental da influência das propriedades termofísi-cas e concentração de nanofluidos, bem como, das características geométricas da superfície aquecedora sobre o ângulo de contato e a molhabilidade. Também, atenção foi dada à prepa-ração e caracterização dos nanofluidos (Al2O3-água e Fe2O3-água), por meio da análise expe-rimental da condutividade térmica e da viscosidade dinâmica para diferentes concentrações; uma bancada experimental, para aquisição de imagens de gota séssil, foi construída a fim de viabilizar as análises de ângulo de conta... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The advance of new technologies, associated to the minimization of manufacturing and installation costs, presents a great challenge for the refrigeration area, since the heat generation has increased in recent years. Thus, the search for new fluids with thermal properties higher than those commonly used has become indispensable to improve energy efficiency. In recent decades, nanofluids-dispersions of nanometer-scale particles (1 to 100 nm) in a base fluid - have attracted special interest not only from the academic community but also from industry in areas such as microelectronics, microfluidics, transport, manufacturing, medical assistance, among others. In this context, the present work had the following goals: the theoretical and experimental study of the influence of thermophysical properties and nanofluid concentration, as well as the geometric characteristics of the heating surface on the contact angle and wetta-bility. Attention was also given to the preparation and characterization of nanofluids (Al2O3-water and Fe2O3-water) by the experimental analysis of thermal conductivity and dynamic viscosity for different concentrations; an experimental apparatus for the acquisition of sessile droplet images was designed in order to analyze the contact angle and wettability; and a computational routine was developed to obtain the drop profile and the surface-fluid interaction for the different nanofluids and surfaces used. Based on database, it was possible to evaluate the pre... (Complete abstract click electronic access below)
Doutor
Takahashi, Eigo. "Correlation between preparation parameters and properties of molybdenum back contact layer for CIGS thin film solar cells". Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4554.
Texto completoID: 028916841; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.M.S.E.)--University of Central Florida, 2010.; Includes bibliographical references (p. 97-111).
M.S.M.S.E.
Masters
Department of Mechanical, Materials and Aerospace Engineering
Engineering and Computer Science
Materials Science and Engineering
Jaza, Rabii. "Towards a prediction of the tribological behaviour of a contact with third body particles : Relating the morphological descriptors of the third body particles with the rheological parameters of the contact". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI023.
Texto completoThis thesis work is a proof of concept. It is the first part of a much larger work where we try to answer the question whether it is possible to set a link between the morphological aspects of the third body particles and the rheological parameters of the contact where they were created. The rheological measurements are almost impossible to obtain without opening the contact itself. Therefore, such a link could be a game changer especially in machine monitoring and failure prediction, which is the long-term goal of this project. In this effort, we evaluate the efficiency of supervised machine learning algorithms in linking back the third body particles with the tests from which they originate. In addition, we assess the ability of the algorithms in predicting the rheological properties of the contact from the morphological descriptors of the wear debris it produced. We held our own tribological tests using a classical pin-disk tribometer. To ensure the production of diverse third body particles, we conduct nine tests organized in three sets. One experimental condition was varied between the tests of a give set. The rheological parameters in this project were calculated directly from the in situ signals recorded during the tribotests. They are are not the usual measures but they are mechanical measurement that describe the flow of the wear debris. Regarding the morphological dataset, we chose five different descriptors to characterize the particles post mortem after the tribological tests were terminated. Those descriptors are calculated through image analysis algorithms of SEM images. Machine learning algorithms had a 40% success rate at learning from in which test each particle was created using only the shape descriptors. However, the results of predicting the rheological parameters from the morphological database were not as promising however they were essential for the future work
Bhatt, Rita. "Growth and Characterization of ZnO for the Front Contact of Cu(In,Ga)Se2". Scholar Commons, 2000. http://scholarcommons.usf.edu/etd/3840.
Texto completoBERNACCHIA, NATASCIA. "Measurement techniques based on image processing for the assessment of biomedical parameters". Doctoral thesis, Università Politecnica delle Marche, 2014. http://hdl.handle.net/11566/242751.
Texto completoBiomedical imaging represents an important topic in the field of diagnosis and clinical research. Image analysis and processing software also helps to automatically identify what might not be apparent to the human eye. The technological development and the use of different imaging modalities create more challenges, as the need to analyse a significant volume of images so that high quality information can be produced for disease diagnosis, treatment and monitoring, in clinical structures as well as at home. All the measurement systems routinely used in clinical environment require to be put in di-rect contact with the subject, which in some cases can be uncomfortable or even non-suited for long monitoring. On the other hand, in some cases contact could alter shape or composition of the samples under study, and state-of-the-art techniques could require a lot of time and provide very low resolution. This doctoral thesis presents a series of new experimental applications of the image analysis and processing in the biomedical field. The aim was to develop and validate new method-ologies, based on image analysis, for non contact measurement of quantities of different nature. The study is focused on the extraction of morphological characteristics of cell ag-gregates to assess of the regeneration processes in infarcted hearts, the design of a non con-tact methodology to measure mechanical properties of rabbit patellar tendons subjected to tensile tests, the development of new methods for the monitoring of physiological parame-ters (heart and respiration rate, chest volume variations) through the use of image acquisi-tion systems, as Kinect™ device and a digital camera. The experimental setups, designed in this work, were validated, showing high correlation respect to the reference methods. Imaging systems, although so different in many aspects, have demonstrated to be suitable for the respective tasks, confirming the feasibility of the imaging approach in the biomedical field.
Baird, Patrick James Samuel. "Mathematical modelling of the parameters and errors of a contact probe system and its application to the computer simulation of coordinate measuring machines". Thesis, Brunel University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320548.
Texto completoPiroti, Shwana y Jesper Eriksson. "Friction Modeling in FE Simulation : Identification of Friction Model Parameters in Airbag and Crash Dummy Head Contact through Simulation and Experimental Data Response Correlation". Thesis, KTH, Hållfasthetslära (Avd.), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232473.
Texto completoSpaulding, Jeremy Maximillian. "Effects of Age on Gait Parameters and Muscle Activity During Adjustment, and the Relationship of Fear of Falling". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/42015.
Texto completoMaster of Science
Vespalec, Vítězslav. "Hodnocení kvality vývrtu brokové hlavně". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232160.
Texto completoBercht, Bernardo Stefano. "Avaliação do endotélio da córnea de chinchilas ( chinchilla Lanigera) em diferentes faixas etárias utilizando a microscopia especular". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/79479.
Texto completoThe corneal endothelium is a monolayer of interconnected flattened polygonal cells that cover the back surface of the cornea, it is essential for the maintenance of its transparency. Due to the complete lack of data on the endothelial cells of chinchilla (Chinchilla lanigera) and its possible use as an animal model in ophthalmic research, the objective was to evaluate the cellular density, pachymetry, the average cell area and morphology of the corneal endothelium of chinchillas in different age groups. It was studied 60 eyes of 30 chinchillas, male or female, of different ages. Chinchillas were divided into three groups with 10 animals each, designated by: G I (animals aged two to four months), G II (animals with 11 months) and G III (animals with four years of age). The mean endothelial cell density in the animals of G I, G II and G III were respectively 3385,39 ± 507,53, 2565,51 ± 220,46 and 1812,82 ± 117,92 cells/mm2. The average cell area was respectively 301,51 ± 43,94, 392,46 ± 33,34 and 553,79 ± 35,70 μm2 for GI, G II and G III. The results indicate a decrease in density, pleomorphism, and increased in average cell area with increasing age. Corneal thickness increased in older animals. The corneal endothelium of chinchillas changes with advancing age.
Brambatti, Gustavo. "Avaliação do endotélio da córnea de coelhos (oryctolagus cuniculus) em diferentes faixas etárias utilizando a microscopia especular". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/142886.
Texto completoThe corneal endothelium is a monolayer of interconnected flattened polygonal cells that cover the back surface of the cornea, it is essential for the maintenance of its transparency. Due to the complete lack of data on the endothelial cells of rabbits (Orictolagus cuniculus) it`s ophthalmic widely used in research, no data relating to corneal endothelium in this species correlating their age. Therefore aimed to assess cell density, the average cell area and morphology of the corneal endothelium of rabbits at different ages. It was studied 36 eyes of 18 rabbits, male or female, of different ages. Rabbits were divided into three groups with 6 animals each, designated by: G I (animals aged six months), G II (animals with 1 year) and G III (animals with four years of age). The mean endothelial cell density in the animals of G I, G II and G III were respectively 2307,16± 319,04, 1894,75 ± 170,81 e 1818,66 ± 245,11 células/mm2. The average cell area was respectively 364,43 ± 39,36, 374,79 ± 48,46 e de 378.50 ± 02,97 μm2 for GI, G II and G III. The pleomorphism medium or percentage of hexagonal cells in the endothelium of the central right and left eyes of rabbits was respectively 65.40 ± 23.39% and 75.15 ± 10.44%, ranging from 42.01 to 88.80 %, and 60.71 to 81.60%. The results indicate a decrease in density, pleomorphism, and increased in average cell area with increasing age. The corneal endothelium of rabbits changes with advancing age.
Lee, Hyunwook. "A Polynomial Chaos Approach for Stochastic Modeling of Dynamic Wheel-Rail Friction". Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77195.
Texto completoPh. D.
Beiki, Majid. "New Techniques for Estimation of Source Parameters : Applications to Airborne Gravity and Pseudo-Gravity Gradient Tensors". Doctoral thesis, Uppsala universitet, Geofysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-143015.
Texto completoFelaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 730
Mackay, Allen B. "Large-Displacement Linear-Motion Compliant Mechanisms". BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/901.
Texto completoСкуріхін, Владислав Ігорович. "Розвиток ресурсозберігаючих технологій раціонального струмознімання на міському електротранспорті". Thesis, Харківський національний університет міського господарства ім. О. М. Бекетова, 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/19886.
Texto completoThesis for granting the Degree of Candidate of Technical sciences in speciality 05.22.09 - Electrical Transport. - National Technical University "Kharkiv Politechnical Institute", Kharkiv, 2015. The dissertation is devoted to solving actual scientific and practical task – development of resource-saving technologies rational of current collection by a city electric vehicle through the use of alternative materials and improved construction of a contact wire. Mathematical modeling of the wear of the parts and components of vehicles. The processes that occur in contact "pantograph-contact wire" and proved the possibility of application promising contact wires of the contact network of city electric transport. Developed the design of the device for physical modeling of main parameters of current collection for testing contact wires and current collectors of different designs.
Скуріхін, Владислав Ігорович. "Розвиток ресурсозберігаючих технологій раціонального струмознімання на міському електротранспорті". Thesis, Харківський національний університет міського господарства ім. О. М. Бекетова, 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/19875.
Texto completoThesis for granting the Degree of Candidate of Technical sciences in speciality 05.22.09 - Electrical Transport. - National Technical University "Kharkiv Politechnical Institute", Kharkiv, 2015. The dissertation is devoted to solving actual scientific and practical task – development of resource-saving technologies rational of current collection by a city electric vehicle through the use of alternative materials and improved construction of a contact wire. Mathematical modeling of the wear of the parts and components of vehicles. The processes that occur in contact "pantograph-contact wire" and proved the possibility of application promising contact wires of the contact network of city electric transport. Developed the design of the device for physical modeling of main parameters of current collection for testing contact wires and current collectors of different designs.
Ben-Naser, Abdusalam. "Measurement of range of motion of human finger joints, using a computer vision system". Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/12531.
Texto completoHolušová, Kateřina. "Standardizace a harmonizace znalecké metodiky pro potřeby Forenzní ekotechniky: les a dřeviny". Doctoral thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-234301.
Texto completoPavloň, Martin. "Analýza dynamických parametrů laserových vibrometrů". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316221.
Texto completoBršlicová, Tereza. "Bezkontaktní detekce fyziologických parametrů z obrazových sekvencí". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221320.
Texto completoAgar, Julie. "Contact parameter estimation using a space manipulator verification facility". Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82459.
Texto completoThe contact parameter estimation problem is addressed for simple and complex contacting geometries using the SPDM Task Verification Facility Manipulator Test-bed (SMT) at the Canadian Space Agency. The SMT is a space-representative robotic simulation facility. Single- and multiple-point contact parameter estimation software toolboxes were developed and used with SMT experiments. Single point SMT contact experiments were performed with six different payloads. The single point toolbox was used as part of the process of identifying payload stiffness from SMT experimental data.
Multiple point contact parameter estimation experiments with the SMT were conducted using a mock-up of an International Space Station Arm Computer Unit (ACU) as payload. The multiple point toolbox was used to generate contact stiffness, damping and friction estimates. An evaluation of the sensitivity of the parameter estimation algorithm to mismatches in ACU physical dimensions and ACU geometry files was conducted.
Trarieux, Chloé. "Mesure des propriétés viscoélastiques non linéaires par une méthode d'acousto-élasticité dynamique : application aux produits cosmétiques". Thesis, Tours, 2014. http://www.theses.fr/2014TOUR3312/document.
Texto completoFew tools have been developed for industrial quality control of textures on production lines. The use of contactless techniques. based on acoustic wavcs, offers an obvious advantage in food-processing industry and cosmetics. The dynamic acoustoelastic testing (DAET) is based on the interaction between a low-frequency compressionlexpansion pump wave and an ultrasound probe wave. leading to the quantification of the viscoelastic properties of the matter. We have initially developed a model describing the variations of the viscoelastic modulus: quantification of nonlinear elastic (B/A, C/A...) and viscous (ωηB/A. ωηC/A...) parameters. The DAET method and related model were then validated in homogeneous media (water, oils and gels) leading to low values of viscoelastic nonlineaiities (B/A<15 and ωηB/A<1), essentially governed by the fluid nature or state change. However, the most significant results were obtained in granular or air-based media (dry powder, foam and hollow beads): high values of quadratic and cubic nonlinearities due to microinhomogeneitics. This method appears to be an interesting alternative to conventional rheometry, especially for the characterization of these complex fluids
Del, Galdo Vittorio. "Impact of the use of different blends of wood chips from diverse botanical species on quality parameters of white wine from Encruzado variety. A study on the effects of a different kind of wood on a white wine with no contact with lees". Master's thesis, ISA/UL, 2018. http://hdl.handle.net/10400.5/17935.
Texto completoThe aim of this study was to assess the influence of blends of wood from different botanical species in a white wine from Encruzado variety; the botanical species used in this study were French oak (Quercus peatraea), American oak (Quercus alba) and Cherry (Prunus avium) during a 60 days maceration period, with sampling done after 15, 30 and 60 days. The blends were obtained by combining 2 woods species in a ratio of 1:1, obtaining 3 blends; that is, Cherry and American oak (Ch+Am), French and American oak (Fr+Am), and Cherry and American oak (Ch+Am). In addition to these treatments 3 Control treatments were created by adding single wood of Cherry (CCh), American oak (CAm) and French oak (CFr), moreover a treatment without wood was kept (C). The amount of wood used was the same for all the treatments, that is 0,5 g/l. on the different sampling days were run both sensory analysis, by a panel of judges, evaluating aroma and taste parameters, and chemical analysis, that is, total phenols, non flavonoids and flavonoids phenols, color evolution, maderization test and tanning power. At the end of the experiment statistical analysis showed relevant data in almost all the analysis, for the chemical analysis cherry showed the highest level of total phenols and flavonoids, which is reflected also in the blends with other woods, while the French oak and its blends showed significant levels of non flavonoids phenols. The browning potential showed an decrease in wines in contact with wood except for CCh, while tanning power showed an increase in all the wines in contact with wood with the blend of cherry and American being the highest tannicity. In the sensory analysis we can observe how the global appreciation of the wines decrease with increasing maceration period with the wood both for the taste and aroma parameters, with C being the most appreciated wine at the last sampling, while the sampling of 15 and 30 days shows the wine with cherry and with American oak showing the highest values
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Damsongsaeng, Prapanpong. "Improvement of Steering Performance of a Two-axle Railway Vehicle via Look-up Tables Estimation". Thesis, KTH, Spårfordon, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-285671.
Texto completoKTH:s Järnvägsgruppen utvecklar en konceptuell design av ett innovativt, två-axligt, lättvikts järnvägsfordon för tunnelbana eller pendeltåg. En aktiv hjuparsstyrning introduceras för att förbättra kurvtagningsförmågan hos fordonet, vilket är ett av de kritiska prestandakraven hos dessa fordon. Det här examensarbetet har som målsättning att förbättra styrningsprestandan av den aktiva hjulsatsstyrningen. För att uppskatta tidsvarierande hjul-rälskontaktparametrar introduceras pre-definierade tabeller (LUT) som en övervakning av en enkel PID-kontroll för det aktiva styrningssystemet, för att förbättra styrprestandan. Uppskattningen som baseras på tabellen fokuserar på tidsberoende hjul-rälsparametrar, inklusive krypkoefficienter och kontaktytans storlek och form. Dessa variabler är i fokus på grund av deras direkta effekt på kurvtagningsförmågan och den laterala stabiliteten hos hjulparet. Den uppskattade longitudinala enhets krypkraften (UCF) har potential att bestämma förstärkningen hos PID-kontrollen på grund av att den, på ett lämpligt sätt, kan skilja mellan olika körtillstånd. Uppskattningen av longitudinell UCF uppnås genom en kombination av resultat för krypkoefficienter och kontaktytavariabler i LUT. Resultaten från den longitudinella UCF-uppskattningen skiftas till den första kvadranten för att användas som kritisk förstärkning i Ziegler-Nichols justeringsmetod för PID-kontroller. Den kritiska oscillationsperioden för PID-justering kan utryckas som en funktion av fordonets hastighet. Utgående från detta använder PID-kontrollen tidsvarierande förstärkning med realtidsjustering för den aktiva styrningen. Det föreslagna kontrollsystemet valideras mot nio körtillstånd med hjälp av SIMPACK och MATLAB/Simulink-simuleringar. Det föreslagna kontrollsystemet tillhandahåller en stabil lateral förflyttning av hjulparet oberoende av körtillstånd. Det aktiva styrsystemet reducerar hjul-räls slitaget signifikant, vilket demonstrerar effektiviteten hos det framtagna aktiva styrsystemet.
Patel, Ketan. "Frequency and time domain contact parameter estimation for space robotic operations". Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19579.
Texto completoSchlegel, Katharina Verena Schlegel Katharina Verena. "Ein Vergleich zwischen histologischen und klinischen Parametern während der experimentellen Gingivitis beim Menschen = (Comparison between histological and clinical parameters during human experimental gingivitis) /". [S.l : s.n.], 1986. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Texto completoEriksson, Anna-Frida. "An Empirical Investigation of the Influence of Context Parameters on Everyday Planning Activities". Thesis, Linköping University, Department of Computer and Information Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4300.
Texto completoThe purpose of the study is to explore the context, from the users’ perspective, in order to find relevant context parameters that can be useful in the development of the future context-aware technology. The goal is to find some of the context parameters relevant to the situated activity and investigate to what extent and in which way they influence the user in everyday planning activities.
The method used in the study was based on scenario descriptions. A total of 41 participants reported how they would have acted in the different situations and they also rated how important they believed the different context factors were in the situations. Analyses were made to reveal relationships between context factors and service properties used by the participants in the scenarios.
In the study several interesting relationships between context factors and the use of services were discovered. The level of urgency was in several situations considered to be important, and it was also found to have an impact on how the participants chose to communicate. The cost was introduced by the participants during the study. It seemed to be important; however, in situations with high urgency it became less important. The study revealed a potential relationship between the risk of disturbing the people in the vicinity and the effort to communicate quietly. Another interesting finding was the relationship between privacy and the choice of modality when communicating: voice-based services were avoided. Further, the importance of privacy and disturbance also appeared to have greater influence in non-anonymous situations than in anonymous.
Syftet med studien är att undersöka kontexten, utifrån användarens perspektiv, för att kunna hitta relevanta kontextfaktorer som kan vara användbara i utvecklingen av kontextmedveten teknologi. Målet är att finna kontextfaktorer som är relevanta för den pågående aktiviteten och undersöka i vilken utsträckning och på vilka sätt dessa faktorer påverkar användaren i de dagliga planeringsaktiviteterna.
Metoden som användes i studien baserades på scenariobeskrivningar. 41 stycken försöksdeltagare fick beskriva hur de skulle ha handlat i de olika situationerna och de fick också skatta hur viktiga de olika kontextfaktorerena var i situationerna. Analyser genomfördes för att finna samband mellan kontextfaktorer och egenskaper hos de tjänster som försöksdeltagarna använde sig av i scenarierna.
I studien upptäcktes en rad intressanta relationer mellan kontextfaktorer och användningen av tjänster. Exempelvis ansågs nivån av brådska vara betydelsefull i flera situationer och den verkade också ha inverkan på hur försöksdeltagarna valde att kommunicera. Försöksdeltagarna introducerade under studien kontextfaktorn kostnad. Kostnaden påverkade valet av tjänster men blev mindre betydande i situationer med stor brådska. Studien visade också på potentiella samband mellan risken att störa människor i sin omgivning och viljan att kommunicera tyst. En annan intressant upptäckt var sambandet mellan avskildhet och kommunikationssätt: röstbaserade tjänster undveks när andra människor fanns i närheten. Dessutom verkade det som om det var viktigare att värna om sin avskildhet och att inte störa andra i ickeanonyma situationer än i situationer där man var helt anonym.
Saccheto, Thiago Jose da Silva. "Estudo dos parametros influentes na vida de uma transmissão continuamente variavel do tipo esfera-cone submetida a contato com"slip/Spin"". [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264393.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: Neste trabalho, é apresentado um estudo dos parâmetros que influem na vida de uma CVT do tipo esfera-cone para aplicação em sistemas de tração humana, particularmente bicicletas. Nos primeiros capítulos, é apresentado um histórico sobre as transmissões e seus grupos principais e em seguida um breve resumo descrevendo os tipos de CVTs mais comuns encontrados no mercado, seu princípio de funcionamento e características principais. Após esse capítulo, é introduzida a teoria de contato de Hertz como forma de cálculo do perfil de pressão normal e o algorítmo de Kalker para o cálculo do perfil de pressão tangencial e slip. As equações de lubrificação também são estudadas nesse trabalho, a fim de determinar a espessura de filme lubrificante no contato da CVT. Por fim é apresentada a CVT do tipo esfera-cone Wagner Forti, na qual são discutidos suas características cinemáticas, dinâmicas e geométricas, além da simulação para um conjunto de condições de operação com o intuito de calcular a vida de contato com slip/spin. Finaliza-se o trabalho correlacionando o tempo de vida calculado com as condições de operação. Palavras Chave- CVT, Tempo de Vida, Contato, Slip, Spin
Abstract: In this work, a study of the parameters that influences the lifetime of a TrackBall CVT for use in systems of human traction, particularly bicycles. First, the mechanical transmissions history is told and mentioned its main groups. Then it presented a brief summary describing the types of CVTs most common in market, their principle of operation and main features. After this chapter, it introduces the theory of Hertz contact as way of calculating the normal pressure profile and, by Kalker algorithm, calculating the tangential profile with slip. The equations of lubrication are also studied in this work in order to determine the thickness of the lubricant film in the contact of CVT. Finally it shows the type of CVT TrackBall Wagner Forti, which is commented on its cinematic, dynamic and geometric features, and the simulation for a range of operating conditions in order to calculate the life of contact with slip/spin. Finally it is the work correlating the life calculated with the conditions of operation. Key Words:CVT, Lifetime, Contact, Slip, Spin
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
Mateášik, Timko Marek. "Experimentální ověření pasivních prvků tepelné regulace družic". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443228.
Texto completoNaveira, Suarez Aldara. "Parameters affecting the functionality of additives in lubricated contacts : effect of base oil polarity /". Luleå : Luleå University of Technology, 2010. http://pure.ltu.se/ws/fbspretrieve/3541725.
Texto completoSuarez, Aldara Naveira. "Parameters affecting the functionality of additives in lubricated contacts : effect of base oil polarity". Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26576.
Texto completoGodkänd; 2010; 20100112 (aldara); LICENTIATSEMINARIUM Ämnesområde: Maskinelement/Machine Elements Examinator: Professor Roland Larsson, Luleå tekniska universitet Tid: Onsdag den 10 februari 2010 kl 10.00 Plats: E 231, Luleå tekniska universitet
Qin, Wenyi. "Many server queueing models with heterogeneous servers and parameter uncertainty with customer contact centre applications". Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33167.
Texto completoSchneck, William Carl III. "Estimation of the Real Area of Contact in Sliding Systems Using Thermal Measurements". Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/35244.
Texto completoMaster of Science
Ozarkar, Malhar. "Design Parameter Identification and Verification for Thermoplastic Inserts". Thesis, Linköpings universitet, Mekanik och hållfasthetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170132.
Texto completoUrbanowicz, Mirosław. "Influence parameters of ignition arrangement on profile of engine : PhD thesis summary". Rozprawa doktorska, [s.n.], 2015. http://dlibra.tu.koszalin.pl/Content/1057.
Texto completoSchmid, Beat. "Sun photometry, a tool for monitoring atmospheric parameters /". Bern : [s.n.], 1995. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Texto completoSzoltys, Kryštof. "Parametrické CAD systémy a databáze součástí". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217957.
Texto completoSilva, Gabriel Hattori da. "Escolha de parametros para analise de contato entre corpos elasticos usando elementos finitos e redes neurais". [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265005.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: Este projeto tem o objetivo de estudar o efeito dos principais parâmetros que afetam a solução do problema de contato entre corpos elásticos. Foi utilizado o software comercial ANSYS 11.0 para realizar as análises de contato. A influência dos principais parâmetros considerados pelo ANSYS no problema de contato, tais como a rigidez de contato normal, o limite de penetração, os algoritmos de contato e métodos de solução, é investigada no trabalho. Observou-se que a rigidez de contato normal influi diretamente na convergência e nos resultados obtidos. Foram estudados alguns exemplos com resultados conhecidos (analíticos ou numéricos) para uma comparação com a solução do ANSYS, e exemplos de maior interesse prático, como o problema de contato do olhal menor de uma biela automotiva. A partir dos casos analisados, algumas recomendações foram feitas para a escolha dos parâmetros de contato. No entanto, existem parâmetros que dependem do conhecimento do usuário ou da realização de testes preliminares, o que requer em muitas situações um maior tempo para se obter os resultados. Como alternativa, foi investigado o potencial das redes neurais para contornar esta limitação. As redes neurais foram treinadas com resultados obtidos da solução do problema de contato (penetração e variação da pressão de contato) de modelos simplificados, tendo como saída da rede a rigidez de contato normal, que é então usada para estimar a rigidez de contato normal de problemas mais complexos. Foi usada a implementação de redes neurais do software MATLAB 7.0 para o treinamento e a simulação das redes neurais
Abstract: The objective of this project is to study the effect of the main contact parameters that affect the solution of the elastic bodies contact problem. The commercial software ANSYS 11.0 was used to run the contact analysis. The influence of ANSYS main parameters in the contact problem, such as normal contact stiffness, penetration limit, contact algorithms and solvers, is investigated in this work. The normal contact stiffness acts directly in convergence and in the obtained results. Some examples with known results (analytic or numeric) were studied to be compared with ANSYS solution, and some examples of more practical interest, as the connecting rod small end contact problem, were also studied. With the analysed cases, some recommendations were done to the choice of the contact parameters. However, there are parameters that depend on the user's knowledge or it is necessary to run some preliminary tests. As an alternative, it was investigated the neural networks potential to overcome this limitation. The neural networks were trained with obtained results of the contact problem solution (penetration and contact pressure variation) of simplified models. The normal contact stiffness was used as output of the network, which was used to estimate the normal contact stiffness of more complex problems. It was used the neural network implementation of the softwareMATLAB 7.0 to the training and simulation of the neural networks
Mestrado
Mecanica dos Solidos
Mestre em Engenharia Mecânica
Mistry, Zubin, Venkata Harish Babu Manne, Andrea Vacca, Etienne Dautry y Martin Petzold. "A numerical model for the evaluation of gerotor torque considering multiple contact points and fluid-structure interactions". Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71111.
Texto completo