Thèses sur le sujet « Material Properties Determination »
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Vogt, Thomas Karl. « Determination of material properties using guided waves ». Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273280.
Texte intégralXavier, Angela Marie. « Determination of the Material Properties of the Pediatric Rib ». The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392019115.
Texte intégralSteinhaus, Thomas. « Determination of intrinsic material flammability properties from material tests assisted by numerical modelling ». Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/3273.
Texte intégralKarlsson, Patrik. « Determination of viscoelastic properties of adhesives ». Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-35521.
Texte intégralKang, JiJun. « Determination of elastic-plastic and visco-plastic material properties from instrumented indentation curves ». Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13509/.
Texte intégralLi, Wanlu. « EXPERIMENTAL STUDIES ON THE DETERMINATION OF ACOUSTIC BULK MATERIAL PROPERTIES AND TRANSFER IMPEDANCE ». UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/48.
Texte intégralVara, Amit Rashiklal. « Determination of material properties of mild steel at different temperatures and strain rates ». Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/5458.
Texte intégralIncludes bibliographical references.
Quantification of material properties through physical experiments is of significant importance. Test data from such experiments aid in the understanding of the material behaviour when exposed to a variety of loading conditions. Such data also help in the formulation of empirical and constitutive relations that can be applied in numerical simulations. This project dealt with the determination of the variation of the yield stress of mild steel with temperature and strain rate. This was achieved by carrying out high temperature tensile tests at different strain rates on mild steel specimens. These experiments also helped set a methodology for carrying out high temperature tensile tests using a servohydraulic universal tester. Results from the tests indicated that increases in temperature tended to decrease the yield stress, whereas increases in strain rate had the opposite effect. This was found to be consistent with data found in literature. It was also noted that the temperature effect was more dominant than the strain rate effect over quasi-static strain rates.
Frazzoli, Alessandra. « Determination of hydration properties of insoluble plant material with different methods under physiological conditions / ». Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17305.
Texte intégralSartkulvanich, Partchapol. « Determination of material properties for use in FEM simulations of machining and roller burnishing ». Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1167412216.
Texte intégralAl, Hamrani Emad, et Nemir Gibrael. « Fast determination of fuel/feedstock material properties and composition : By Near infrared (NIR) spectroscopy ». Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-33522.
Texte intégralHelweg, Christian. « Methods for determination of environmentally important physical- chemical properties of polar polycyclic organic material / ». Roskilde : Roskilde University, Institute of Life Sciences and Chemistry, Risø National Laboratory, Department of Plant Biology and BiogeoChemistry, 1997. http://hdl.handle.net/1800/472.
Texte intégralDippenaar, Jan Diederick. « The tensile properties of early age concrete and the experimental apparatus required for its determination ». Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96866.
Texte intégralENGLISH ABSTRACT: The early age cracking of concrete, which includes plastic shrinkage cracking (PShC) and plastic settlement cracking (PSeC), commonly occurs in flat concrete elements such as bridge decks and slabs or at the change of a concrete section depth. These cracks typically occur once the concrete has been cast and consolidated up to the final setting time, and initiate when the tensile stresses developed in the concrete exceeds its ultimate tensile strength or, alternatively phrased, when the restrained shrinkage induced strain in the concrete exceeds its tensile strain capacity. These cracks have a premature detrimental effect on the durability and strength of concrete structures as they allow deleterious materials to penetrate the concrete, which could cause the corrosion of steel reinforcing. With this in mind, the objective of this study is to gain a fundamental understanding of the tensile properties of early age concrete, up to the point of final setting, as well as the variables that affect these properties. This is done to better understand, and ultimately reduce the risk of early age cracking. To achieve this, experimental assemblies found in literature were evaluated and built upon to create a multi-component uniaxial tensile testing setup that is able to capture the complete stress-strain behaviour of early age concrete, while still in a plastic state. The following significant findings were attained from this study: • Reducing the coarse aggregate size in a concrete mix increases both the tensile strength and Young’s modulus of early age concrete, while reducing both its fracture energy and fracture process zone (FPZ) characteristic length. • The low volume addition of microfibres to a conventional concrete mix increases both the fracture energy and the FPZ characteristic length of early age concrete. • The low volume addition of microfibres to a conventional concrete mix increases the strain capacity of early age concrete shortly before and after the initial setting time. This increased strain capacity is believed to be of great significance for the prevention of PShC. • The addition of an accelerator to a conventional concrete mix accelerates the development of the tensile properties of early age concrete, while a retarder reduces it. • The addition of a retarder to a conventional concrete mix increases the strain capacity of early age concrete shortly before and after the initial setting time. This provides a reason for the reduced PShC severity observed in retarded mixes in certain instances. From this study it is concluded that the results from the tensile tests provide a greater understanding of the tensile properties of early age concrete as well as the variables that affect them. When interpreting these results in combination with those obtained from PShC experiments, it is suggested that it is possible to determine when and if PShC will occur.
AFRIKAANSE OPSOMMING: Die vroëe-ouderdom kraking van beton, wat plastiese krimp krake (PKK) en plastiese versakkings krake (PVK) insluit, kom algemeen voor in plat betonelemente soos brug-dekke en blaaie, of by die die verandering in die deursnit diepte van betonelemente. Die krake kom tiepies voor vandat beton gegiet en gekompakteer is totdat dit die finale settyd bereik, en vind plaas sodra die trekspanning wat in die beton ontstaan sy treksterkte oorskry of, anders bewoord, wanneer die verhinderde krimp geinduseerde vervorming van die beton, die vervormings-kapasiteit van die beton oorskry. Hierdie krake het ʼn voortydige nagelige uitwerking op die duursaamheid en sterkte van betonstrukture aangesien hulle toelaat dat skadelike stowwe die beton binnedring, wat die korrosie van staalbewapening veroorsaak. Met dit ingedagte is die doel van die studie om fundamentele kennis rakende die vroëe-ouderdom trekeienskappe van beton, tot by die punt van finale set, asook die veranderlikes wat die eienskappe beinvloed, te verwerf. Om vroëe-ouederdom krake beter te verstaan en uiteindelik, te voorkom, is hierdie kennis nodig. Eksperimentele opstellings in literatuur is ge-evalueer en op voortgebou vir die bou van ʼn multi-komponet eenassige terktoetsopstelling om die volledige spanning-vervorming gedrag van vroëe-ouderdom beton vas te vang. Die volgende bevindings het uit die studie aan die lig gekom: • ʼn Kleiner aggregaat grootte in n betonmeng verhoog beide die trekstrekte en Young se modulus van vroëe-ouderdom beton, terwyl dit beide die fraktuur-energie en die fraktuur proses sone (FPS) se karakteristieke lengte verminder. • Die lae volume byvoeging van mikrovesels tot ʼn betonmeng verhoog beide die fraktuur-energie en die FPS se karakteristieke lengte van vroëe-ouderdom beton. • Die lae volume byvoeging van mikrovesels tot ʼn betonmeng verhoog die vervormings kapasiteit van vroëe-ouderdom beton kort voor en na die aanvanklike settyd. Daar word geglo dat hierdie verhoogde vervormings-kapasiteit van groot belang is vir die voorkoming van PKK. • Die byvoeging van ʼn versneller tot ʼn betonmeng versnel die ontwikkelingstempo van die trekeienskappe van vroëe-ouderdom beton, terwyl ʼn vertrager dit verlaag. • Die byvoeging van ʼn vertrager tot ʼn betonmeng verhoog die vervormings-kapasiteit van vroëe-ouderdom beton kort voor en na die aanvanklike settyd. Dit verskaf die rede vir die bevinding dat die byvoeging van ʼn vertrager PKK in sekere gevalle verminder. Hierdie studie het bevind dat die die trektoetse ʼn groter begrip rakende die trek-eienskappe van vroëe-ouderdom beton, en die veranderlikes wat die eienskappe beinvloed, gelewer het. Wanneer die resultate van die studie tesame met PShC toetse geinterpreteer word, will dit voorkom dat dit moontlik is om te bepaal wanneer, en of PKK sal plaasvind.
Pitié, Frédéric. « High temperature thermal energy storage : encapsulated phase change material particles : determination of thermal and mechanical properties ». Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/57108/.
Texte intégralDemiralp, Yurdaer. « Determination of Material Properties and Prediction of Springback in Air Bending of Advance High Strength Steel (AHSS) and Commercially Pure Titanium (CP) Sheet Materials ». The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1339768136.
Texte intégralPetropoulos, Nikolaos. « Improved understanding of sublevel blasting : Determination of the extent of the compacted zone, its properties and the effects on caving ». Doctoral thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65973.
Texte intégralSenan, Anish Sen. « Determination of the Viscoelastic Properties of General Anisotropic Materials ». Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/SenanAS2003.pdf.
Texte intégralSher, Arnold. « Holographic determination of mechanical properties and behaviour of materials ». Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/21833.
Texte intégralThis study, which was primarily experimental, was aimed at investigating the feasibility and development of experimental procedures using holographic interferometry to determine different material properties such as: i) Modulus of Elasticity (E) ii) Poisson's ratio (v) (which included a study into the Modulus of Rigidity. (G)) iii) creep behaviour at room temperature. The Elastic Modulus (E) was determined from the relationship E=v²p, where v is the velocity of a longitudinal wave propagating in a long rod and p is the density of the rod. The technique of double-exposure holographic interferometry was used to record longitudinal waves propagating in long brass and steel rods. The waves were initiated by striking the end of the rod with a pendulum. From the pulsed laser interferograms obtained, the distance travelled by the wave in a known time could be measured and thereby the velocity (v) could be calculated. Experimental results indicate that it is feasible fo use holographic interferometry when dynamically determining the Elastic Modulus. The values produced for brass and steel compared favourably with the ones obtained from the ultrasonic velocity technique.
Kravets, Robert R. « Determination of thermal conductivity of food materials using a bead thermistor ». Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54223.
Texte intégralPh. D.
Tytler, Duncan G. F. « Determination of the thermal properties of materials utilising remote sensing techniques ». Thesis, University of Bath, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760687.
Texte intégralYurtseven, Alp Eren. « Determination Of Mechanical Properties Of Hybrid Fiber Reinforced Concrete ». Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605268/index.pdf.
Texte intégralzgü
r Yaman August 2004, 82 pages Fiber reinforcement is commonly used to provide toughness and ductility to brittle cementitious matrices. Reinforcement of concrete with a single type of fiber may improve the desired properties to a limited level. A composite is termed as hybrid, if two or more types of fibers are rationally combined to produce a composite that derives benefits from each of the individual fibers and exhibits a synergetic response. This study aims to characterize and quantify the mechanical properties of hybrid fiber reinforced concrete. For this purpose nine mixes, one plain control mix and eight fiber reinforced mixes were prepared. Six of the mixes were reinforced in a hybrid form. Four different types of fibers were used in combination, two of which were macro steel fibers, and the other two were micro fibers. Volume percentage of fiber inclusion was kept constant at 1.5%. In hybrid reinforced mixes volume percentage of macro fibers was 1.0% whereas the remaining fiber inclusion was v composed of micro fibers. Slump test was carried out for each mix in the fresh state. 28-day compressive strength, flexural tensile strength, flexural toughness, and impact resistance tests were performed in the hardened state. Various numerical analyses were carried out to quantify the determined mechanical properties and to describe the effects of fiber inclusion on these mechanical properties. Keywords: Fiber Reinforcement, Hybrid Composite, Toughness, Impact Resistance
Kesler, Olivera E. (Olivera Elizabeth). « Experimental determination of processing-induced stresses and properties of graded nickel-alumina coatings ». Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/46097.
Texte intégralAbbas, Zulkifly. « Determination of the dielectric properties of materials at microwave frequencies using rectangular dielectric waveguide ». Thesis, University of Leeds, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.569541.
Texte intégralChen, Hongniao, et 陈红鸟. « Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B49799447.
Texte intégralpublished_or_final_version
Civil Engineering
Doctoral
Doctor of Philosophy
Lawson, Joseph L. « On the determination of the elastic properties of geopolymeric materials using non-destructive ultrasonic techniques / ». Online version of thesis, 2008. http://hdl.handle.net/1850/7356.
Texte intégralPavlov, Tsvetoslav. « Experimental determination and modelling of various thermo-physical properties of nuclear materials above 1500 K ». Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/58012.
Texte intégralLombardo, David. « Accurate Determination of Nonlinear Optical Properties of Cadmium Magnesium Telluride ». University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1429272337.
Texte intégralKim, Sung-Hee. « Determination of aggregate physical properties and its effects on cross-anisotropic behavior of unbound aggregate materials ». Texas A&M University, 2004. http://hdl.handle.net/1969.1/2745.
Texte intégralMuir, Dave D. « One-sided ultrasonic determination of third order elastic constants using angle-beam acoustoelasticity measurements ». Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29766.
Texte intégralCommittee Chair: Michaels, Thomas; Committee Co-Chair: Michaels, Jennifer; Committee Member: Degertekin, Levent; Committee Member: Qu, Jianmin; Committee Member: Ruzzene, Massimo; Committee Member: Scott, Waymond. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Deniz, Saygin. « Determination Of Relations Between Elastic Properties Of Cement Mortars By Using Destructive And Nondestructive Methods ». Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611544/index.pdf.
Texte intégrals ratio and strength of these mixtures were observed for different ages. The relationships between these elastic properties are determined and the results obtained from two different nondestructive test methods are compared. Although nondestructive tests made it possible to obtain elastic properties of mortar mixtures, the results revealed that it is very difficult to develop a single relationship between different elastic properties of mortars with varying mixture proportions. This situation is mainly due to the anisotropy and nonlinear behavior of the mortar and the difficulty of describing the actual behavior of mortar by formulations defined for perfectly elastic materials.
Poolthong, Suchit. « Determination Of The Mechanical Properties Of Enamel Dentine And Cementum By An Ultra Micro-Indentation System ». Thesis, The University of Sydney, 1998. http://hdl.handle.net/2123/4963.
Texte intégralDejana, Herceg. « Modelovanje mernih transformatora bez jezgra sa feromagnetskim oklopom ». Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2016. https://www.cris.uns.ac.rs/record.jsf?recordId=96158&source=NDLTD&language=en.
Texte intégralIn this thesis a method for examining the effects of shielding on a corelessmeasuring transformer from the standpoint of transformer linearity and EMradiation shielding is developed. A parametric model of the shield and thecoreless measuring transformer is constructed. Measurements of magneticproperties of ferromagnetic materials were performed; a new analytical modelof hysteresis is developed; magnetization curves and permeability of thematerials are determined. Based on numerical and experimental results, andusing the defined criterion, the analysis of shielding quality of the consideredshield types was performed.
Mponya, Ereck. « Determination of rock material properties to design robust support at Unki Mine ». Thesis, 2016. http://hdl.handle.net/10539/22326.
Texte intégralSince mining platinum started at Unki Mine in 2005, large and small geologically controlled falls of ground (FOG) have been problematic especially in 2011 where a FOG caused a fatality. This study is about determining the rock properties at Unki Mine and then using the results to design and recommend robust support to reduce the FOG problems that are continuously happening. The study analysed all the FOG data from the mine database from 2010 to 2015 using statistical methods. Rock properties of the hangingwall, ore zone and footwall were determined from the laboratory tests. The geological structures were also mapped carefully. The results were then used as input data to the numerical modelling softwares Phase2 and J-Block. The J-Block program was used to determine the number of keyblocks that were stable, unstable and failed with support in designated and specified bords. A probabilistic approach was used to evaluate the stable span with special reference from small to large hangingwall instabilities for different mining scenarios. It was found out using Phase2 that large spans at Unki Mine are possible provided appropriate and robust support system is adopted. To fully address the issue of FOG problem at Unki Mine, a probabilistic approach is recommended as this is considered to be more appropriate than a deterministic approach that has been the traditional design approach so far.
MT2017
Zheng, Hong-Hui, et 鄭鴻輝. « Development of Resonant Ultrasound Spectroscopy for Determination of Material Properties of Solids at High Frequency ». Thesis, 2008. http://ndltd.ncl.edu.tw/handle/53372473796737249041.
Texte intégral國立成功大學
土木工程學系碩博士班
96
In this thesis, a resonant ultrasound spectroscopy was developed for determination of material properties of solids at high frequency, such as the shear modulus G, Young’s modulus E and linear viscoelastic damping of the material. Specimens are mounted between two piezoelectric ultrasonic transducers by corner contact without gluing. One of the transducers generates mechanical excitation, and the other behaves as a receiver. The corner contact provides elastically weak coupling to the transducers, and hence minimal perturbation to the vibration, minimal shift in resonant frequency and minimum parasitic damping. To compare with experimental results, finite element calculations with ABAQUS are performed. It is found that shear transducers provide stronger signals than compressional ones due to the lowest resonance mode being shear modes. For short cylinders, the orientation of the cylinder may influence the strength of measured signals when shear transducers are adopted. The tilt of the specimens may affect measurements as well. The linear viscoelastic damping is found to be linearly decreases as frequency increases, suggesting the string theory of vibrating dislocations is correct in metals, such as Sn, Al and stainless steel. In experiment result, the damping tan δ of Al about 2.29 ~ 5.58 × 10-4, SS about 3.21~8.46×10-4, and Sn about 4.55~ 1.29×10-3, roughly consistent with the data reduction method by using the Lorentzian curve fitting.
Fatseyeu, Arkadz. « Determination of properties of viscoelastic materials by nanoindentation ». Thesis, 2005. http://spectrum.library.concordia.ca/9160/1/MR20759.pdf.
Texte intégralChien, Hui-Lung, et 簡惠龍. « The Determination of Mechanical Properties of Biomedical Materials ». Thesis, 2012. http://ndltd.ncl.edu.tw/handle/85917240827423764764.
Texte intégral國立中山大學
機械與機電工程學系研究所
100
The mechanical properties of biomedical materials were determined and discussed in this study. The extension and tensile tests for aorta and coronary artery were carried out using tensile testing machine. Based on incompressibility of biological soft tissue, the stress-stretch curves of arteries were obtained. This study proposed a nonlinear Ogden material model for the numerical simulation of coronary artery extension during stent implantation. The corresponding Ogden model parameters were derived by the obtained stress-stretch curves from tensile tests. For validation, the proposed nonlinear Ogden material model for coronary artery was applied to a Palmaz type stent implantation process. The simulated stent deformation was found to be reasonable. It had a good correlation with the measured results. The microindentation experiments were used to measure the mechanical properties of enamel and dentine of human teeth in this study. To reveal the relation between the experimental parameters and measured mechanical properties, Young’s moduli were investigated by varying experimental parameters. The parameter of maximum indentation load significantly influences measured values. Young’s modulus varies very slightly when 10 to 100 mN of maximum indentation load applied. Young’s modulus is not sensitive to the parameters of portion of unloading data and teeth age. The combination of finite element analysis and curve-fitting method is proposed to determine the mechanical properties of thin film deposited on substrate. The mechanical properties of thin film, i.e. Young’s modulus, yield strength and strain-hardening exponent, were extracted by applying an iterative curve-fitting scheme to the experimental and simulated force-indentation depth curves during the microindentation loading and unloading processes. The variation of mechanical properties of TiN thin films with thicknesses ranging from 0.2 to 1.4 μm was extracted. The results presented the film thickness effect makes the Young’s modulus of TiN thin films reduces with reducing film thickness, particularly at thicknesses less than 0.8 μm. Therefore, it can be inferred that a film thickness of 0.8 μm possibly represents the upper bound when employing macroscopic mechanics with bulk material properties.
Kang, Lee Chen, et 李承康. « Practical Determination of Dielectric Properties of Materials in ency ». Thesis, 1995. http://ndltd.ncl.edu.tw/handle/40111942206436427354.
Texte intégral國立臺灣科技大學
工程技術研究所
83
In this study, a dielectric constant measurement technique of microwave frequency is presented with theoretical analysis and experimental results. In this measurement technique the sample is inserted between waveguides to measure the S parameters over a wide bandwidth. Furthermore, in this study, with rigorous network analyzer calibration and de-embedding procedures, erect a complete measurement system. Experimental results are very close to known data.
Shiou-AnTsai et 蔡修安. « Modulated Ellipsometer for the Determination of the Properties of Optical Materials ». Thesis, 2010. http://ndltd.ncl.edu.tw/handle/04906751154118061265.
Texte intégral國立成功大學
工學院工程管理專班
98
In this research, we propose a scheme to measure the ellipsometric parameters of the materials, and construct an analytic model which is composed of the 4x4 method and signal processing system. And the simulation results and experimental initial results confirms that the feasibility of the proposed the modulated ellipsometry system which is combined with a heterodyne interferometer. The frequency of the saw tooth signal from a function generator that applied to the EO modulator was 1 kHz. In the experimental results, we have shown that the standard deviation of Ψ is 0.1313o, the standard deviation of Δ is 0.6829o, and the standard deviation of thickness is 0.9355(nm). In addition, we also show the feasibility of the full-field measurement by using the modulated ellipsometry we proposed. However, it’ll combine an image processing algorithm based on a three-integrating-bucket method and a heterodyne interferometer. The pre-experimental results have shown that the ellipsometric parameters (Ψ and Δ) have slight difference on the pattern of the solar cell. In this study, the measurement based on the modulated ellipsometry has been developed. Moreover, the proposing system has the ability to measure the full range of the ellipsometric parameters form the detected area of materials. However, this new proposed measurement system has two special characteristics. Unlike the other previous studies, we propose the scheme to measure the ellipsometric parameters of the materials by taking the two phases from the optical model. In addition, the presence of environmental disturbances via the use of a common-path configuration for the interferometer system cannot affect the measurement results by eliminating the DC component of the output light intensity signal in the signal processing algorithm.
« Numerical Modeling, Determination, and Characterization of Electrical Properties of Nanocomposites ». Thesis, 2011. http://hdl.handle.net/1911/70493.
Texte intégralChen, Ya-Wan, et 陳雅玟. « Theoretical Determination for Mechanical Properties of High-Performance Cementitious Materials with Defects ». Thesis, 2007. http://ndltd.ncl.edu.tw/handle/94347925113576605761.
Texte intégral國立高雄應用科技大學
土木工程與防災科技研究所
95
Based on the concept of a three-phase composite, the mechanical properties of high-performance cementitious materials (cement paste, mortar and concrete) with defects are examined. Those defects, especially voids and microcracks, were measured by MIP and SEM respectively while the materials with different aggregate contents were subjected to 0.3 , 0.5 , 0.8 and in turns. With the aim of a four-parameter model and the three-phase composite model, the stress-strain curves of high-performance cementitious materials were simulated. The simulated stress-strain curves were compared with the experimental ones to confirm the reliability of this three-phase composite theory we propose. Results show that the four-parameter model is suitable to determine stress-strain curves of high-performance cementitious materials by means of four parameters. Meanwhile, by comparing with the experiments, the theoretical predictions are in an acceptable range for the stress-strain curves of materials with voids and microcracks. Thus, it is anticipated that the three-phase micromechanics theory can be chosen to simulate the stress-strain relationships of high-performance cementitious materials.
Chen, Po-Chun, et 陳柏郡. « Mueller-matrix-based Polarimeter for the Determination of the Properties of Optically Anisotropic Materials ». Thesis, 2009. http://ndltd.ncl.edu.tw/handle/31676121772961220740.
Texte intégral國立成功大學
機械工程學系碩博士班
97
A new technique to measure optically anisotropic materials by Mueller matrix and Stokes parameters using a polarimeter is proposed. The measuring technique to determine the principal axis angle (α), retardance (β), diattenuation axis angle (θd), diattenuation (D), and optical rotation angle (γ) in the linear birefringence, linear diattenuation, and circular birefringence is successfully extracted by an analytical model. The dynamic range of five parameters α, β, θd, γ, and D are 0°~180°, 0°~180°, 0°~180°, 0°~180°, and 0~1, respectively, and only β is not in the full range. From author’s knowledge, this is the first finding that the linear birefringence and linear diattenuation could decouple in the analytical model. Five optical parameters of a single-mode fiber are extracted simultaneously and successfully. Also, a complex polarimetric system with an optical fiber is first quantitatively analyzed in Stokes parameters successfully by using this new proposed model. In conclusion, this could be an important step for researches on anisotropic materials like optical thin films or bio-tissues.
« A Numerical Resistor Network Model for the Determination of Electrical Properties of Nanocomposites ». Thesis, 2011. http://hdl.handle.net/1911/70487.
Texte intégralVaidyanathan, M. S. « Modeling Lysis Dynamcis Of Pore Forming Toxins And Determination Of Mechanical Properties Of Soft Materials ». Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2466.
Texte intégral« A non-linear finite element model for the determination of elastic and thermal properties of nanocomposites ». Thesis, 2009. http://hdl.handle.net/1911/61893.
Texte intégralErdoğan, Sinan Turhan Fowler David W. Garboczi Edward J. « Determination of aggregate shape properties using X-ray tomographic methods and the effect of shape on concrete rheology ». 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/1904/erdogans78599.pdf.
Texte intégralErdoğan, Sinan Turhan. « Determination of aggregate shape properties using X-ray tomographic methods and the effect of shape on concrete rheology ». Thesis, 2005. http://hdl.handle.net/2152/1904.
Texte intégralKunte, Girish V. « Vapour Pressure Studies Of Precursors And Atomic Layer Deposition Of Titanium Oxides ». Thesis, 2008. http://hdl.handle.net/2005/762.
Texte intégral(8713962), James Ulcickas. « LIGHT AND CHEMISTRY AT THE INTERFACE OF THEORY AND EXPERIMENT ». Thesis, 2020.
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