To see the other types of publications on this topic, follow the link: Thermal analogy.
Dissertations / Theses on the topic 'Thermal analogy'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 31 dissertations / theses for your research on the topic 'Thermal analogy.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Nguyen, Vinh Dinh. "A finite element mesh optimization procedure using a thermal expansion analogy." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/101248.
Full textAbstract:
Finite element optimum meshes are synthesized by the use of thermal expansion principles in conjunction with an analogous temperature field computed from the element strain energy contents. Elements having high strain energy contents are shrunk and those with low strain energy contents are expanded until all elements contain the same amount of strain energy. Deviatoric strain energy is also used in place of the strain energy as the objective function for the optimization method. Both objective functions yield significant improvements of the meshes after only a few iterations. In one test case, the errors in the maximum stresses are reduced by more than 1/3 after 1 iteration. In another test case, the error in the stress concentration factor is reduced by more than 3/4 after 7 iterations.M.S.
2
Arnold, Michael Stuart. "Teaching a scientific mental model. A case study : using analogy to construct a model of thermal processes." Thesis, University of York, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317714.
Full text
3
Beecham, M. C. "Finite element analysis of the human left ventricle in diastole and systole." Thesis, Brunel University, 1997. http://bura.brunel.ac.uk/handle/2438/5148.
Full textAbstract:
Previously, at Brunel University, two computer programs had been developed to facilitate the analysis of the diastolic material properties of the human left ventricle. These two computer programs consisted of; a finite element program, "XL1", which ran upon a Cray-1S/1000 and a post-processor and pre-processor, "HEART", which ran upon the Multics computer system. The computer program "HEART" produced the finite element model, which was then solved by "XL 1", and it also allowed for plotting the results in graphical form, The patient data was supplied by the Royal Brompton Hospital in the form of digitised cine-angiographic X-ray data plus pressure readings. The first stage was to transfer the two separate computer programs "HEART" and "XL 1" to the Sun Workstation system. The two programs were then combined to form a single package which can be used for the automated analysis of the patient data. An investigation into the effect that the elastic modulus ratio has upon the deformation of the left ventricle during diastole was performed. It was found that the effect is quite small and that using this parameter to match overall shape deformation would be extremely sensitive to the accuracy of the initial data. The main part of this work was the implementation of active cardiac contraction, by means of a thermal stress analogy, into the finite element program. This allows the systolic part of the cardiac cycle to be analysed. The analysis of the factors that affect cardiac contraction, including the material properties and boundary conditions was performed. This model was also used to investigate the effect that conditions such as ischaemia and the formation of scar tissue have upon the systolic left ventricle. The use of the thermal stressing analogy for cardiac contraction was demonstrated to mirror global and local deformation when applied to a realistic ventricular geometry.
4
Karadal, Fatih Mutlu. "Active Flutter Suppression Of A Smart Fin." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609830/index.pdf.
Full textAbstract:
This study presents the theoretical analysis of an active flutter suppression methodology applied to a smart fin. The smart fin consists of a cantilever aluminum plate-like structure with surface bonded piezoelectric (PZT, Lead- Zirconate-Titanate) patches.
A thermal analogy method for the purpose of modeling of piezoelectric actuators in MSC®/NASTRAN based on the analogy between thermal strains and piezoelectric strains was presented. The results obtained by the thermal analogy were compared with the reference results and very good agreement was observed. The unsteady aerodynamic loads acting on the structure were calculated by using a linear two-dimensional Doublet-Lattice Method available in MSC®
/NASTRAN. These aerodynamic loads were approximated as rational functions of the Laplace variable by using one of the aerodynamic approximation schemes, Roger&
#8217
s approximation, with least-squares method. These approximated aerodynamic loads together with the structural matrices obtained by the finite element method were used to develop the aeroelastic equations of motion of the smart fin in state-space form. The Hinf robust controllers were then designed for the state-space aeroelastic model of the smart fin by considering both SISO (Single-Input Single-Output) and MIMO (Multi-Input Multi-Output) system models. The verification studies of the controllers showed satisfactory flutter suppression performance around the flutter point and a significant improvement in the flutter speed of the smart fin was also observed.
5
Brotto, T. "DYNAMICS WITH SELECTION." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/363043.
Full textAbstract:
The subject of this thesis is population dynamics. We study its features in the absence or in the presence of a spatial structure, and this is reflected in the manuscript division into two parts.
In the first one, we consider the competition as taking place among all individuals at the same time, and we show that a condition of detailed balance is satisfied in different evolutionary regimes (and not only, as known in literature, in the successional-mutations regime). We show that the adaptive dynamics of a population has many aspects in common with the out of equilibrium dynamics of glasses, the role of the temperature being played by the number of individuals in the population. We suggest numerous applications of such a correspondence. Next, we consider the evolution of interacting monomorphic populations. We show how the coupling causes a separation of the adaptive temporal scales, and that it is possible to establish a hierarchy in the degree of adaptation of the interacting populations.
In the case of populations competing in space, the evolutionary dynamics is strongly modified by the locality of the interactions. The selection mechanisms are less effective in favouring the establishment of the fittest phenotype. We prove quantitatively that an increased rate of mutation involves an evolutionary disadvantage, since the presence of mutants slows the spatial growth of a population. We show how, if the mutation rate is variable, the selection favours not only a high reproduction rate, but also a low rate of mutation.
6
LeBlanc, David G. (David Guy Richard) Carleton University Dissertation Engineering Electrical. "Simultaneous rapid thermal oxidation of silicon and polysilicon for analog CMOS applications." Ottawa, 1989.
Find full text
7
White, Douglas W. "Studies of solid carbon dioxide in interstellar ice analogs subject to thermal processing." Birmingham, Ala. : University of Alabama at Birmingham, 2010. https://www.mhsl.uab.edu/dt/2010p/white.pdf.
Full textAbstract:
Thesis (Ph. D.)--University of Alabama at Birmingham, 2010.Title from PDF t.p. (viewed July 20, 2010). Additional advisors: Mian M. Abbas, Renato P. Camata, Sergey B. Mirov, Thomas M. Orlando. Includes bibliographical references (p. 111-117).
8
Malatin, Richard. "Využití termické analýzy litin pro predikci kvality odlitků numerickou simulaci." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-387734.
Full textAbstract:
This work deals with problem of analyzing cooling curves of ductile iron and discovering possibility to predict shrinkage tendency of melt from thermal analysis results. This work was executed in foundry production conditions where obtained data from thermal analysis data linked to experimental castings where amount of shrinkage was estimated. Data were analyzed and looked for correlations between acquired thermal data and shrinkage defects.
9
Kočiová, Silvia. "Využití metod termické analýzy při fyziologické charakterizaci mikroorganismů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-316176.
Full textAbstract:
This diploma thesis deals with the applicability of thermal analysis in the influence of stress factors on microorganisms. The main aim of the presented work was to design and implement a series of experiments to thest the usability of advanced methods of thermal analysis in the characterization of microorganisms. Two bacterial strains were used as model organisms: Cupriavidus necator H16 and its mutant strain Cupriavidus necator PHB-4, which differs in the ability to produce polyhydroxyalkanoates. The basic technique used thermogravimetric analysis (TGA), which was optimized and applied in the study of water transport, behavior and determination of intracellular water content with respect to the influence of the presence of intracellular PHB granules. The results of this method were subsequently supported by TEM photos.
10
Helvey, Jacob. "Experimental Investigation of Wall Shear Stress Modifications due to Turbulent Flow over an Ablative Thermal Protection System Analog Surface." UKnowledge, 2015. http://uknowledge.uky.edu/me_etds/57.
Full textAbstract:
Modifications were made to the turbulent channel flow facility to allow for fully developed rough quasi-2D Poiseuille flow with flow injection through one surface and flow suction through the opposing surface. The combination of roughness and flow injection is designed to be analogous to the flow field over a thermal protection system which produces ablative pyrolysis gases during ablation. It was found that the additional momentum through the surface acted to reduce skin friction to a point below smooth-wall behavior. This effect was less significant with increasing Reynolds number. It was also found that the momentum injection modified the wake region of the flow.
11
Chyla, Ondrej. "Ověření účinku očkovadel na strukturu litiny s využitím termické analýzy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241930.
Full textAbstract:
This diploma thesis in the theoretical part deals with classification of cast iron, problems of gray cast iron production, methods of inoculation and valuation of the gray iron quality by means of thermal analysis. The aim of practical part was to investigate effectiveness of inoculation of two different inoculants using thermal analysis. In terms of mechanical properties, hardness and ultimate tensile strength were measured. Metallographic specimen were evaluating by means of image analysis software.
12
Smith, Bradley Joseph. "Steam-Assisted Catalysis of n-Dodecane as a Jet Fuel Analogue in a Flow Reactor System for Hypersonic Thermal Management." University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1577978953025703.
Full text
13
Ojwang, Dickson Odhiambo. "Prussian blue analogue copper hexacyanoferrate : Synthesis, structure characterization and its applications as battery electrode and CO2 adsorbent." Doctoral thesis, Stockholms universitet, Institutionen för material- och miljökemi (MMK), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-146335.
Full textAbstract:
Prussian blue (PB) and Prussian blue analogues (PBAs) are compounds with potential applications in a large variety of fields such as gas storage, poison antidotes, electrochromism, electrochemistry and molecular magnets. The compounds are easy to synthesize, cheap, environmentally friendly and have been pursued for both fundamental research and industrial purposes. Despite the multifunctionality of PB and PBAs, they have complicated compositions, which are largely dependent on the synthesis methods and storage conditions. Thus, performing investigations on such compounds with defined composition, stoichiometry and crystal structure is essential. This thesis has focused on synthesis and detailed structure characterization of copper hexacyanoferrate (CuHCF) via X-ray powder diffraction (XRPD), neutron powder diffraction (NPD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), inductively coupled plasma-optical emission spectroscopy (ICP-OES), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), Mössbauer spectroscopy, extended X-ray absorption fine structure (EXAFS), infrared (IR) and Raman techniques. In addition, kinetics of thermal dehydration process, CO2 adsorption and CO2 adsorption kinetics were investigated. Moreover, in operando synchrotron X-ray diffraction experiments were performed to gain insight into the structure-electrochemistry relationships in an aqueous CuHCF/Zn battery during operation.At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Manuscript. Paper 5: Manuscript.
14
Dohnal, Milan. "Kontrolní pevnostní výpočet napojení potrubí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378406.
Full textAbstract:
The master thesis focuses on the strength calculation of piping with extra consideration given to the local effects of thermal loads. To be recognized as properly functioning, the piping is required to withstand the expected operating conditions in order to enable the continuous transport of the working fluid within the interconnected devices. It is imperative to take into consideration the variable thermal load in the area where the individual pipe branches connect into the main transmission piping. A major part of the thesis is concerned with the assessment of the expected workload influence on the most stressed parts of the system. The data are gathered by employing temperature and stress-strain analyses carried out in the ANSYS Mechanical program using the finite element method. The values based on the analyses are cross-checked with both the permitted values according to the ASME standard B31.3 Process piping and the ASME Boiler and Pressure Vessel Code stress categorization method. Since all the evaluated stresses are below their respective permissible values, the piping strength is concluded as satisfactory according to the standards.
15
Matějka, Libor. "Optimalizace konstrukčních detailů jednoplášťových plochých střech." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-234545.
Full textAbstract:
This thesis deals with the optimization of structural details for flat single-leaf roofs. In the first part of the thesis, 3 groups of structural details for flat roof (flat roof parapet, gutter at flat roof without overhang of the roof cladding, intersection of the flat roof and vertical supporting structure) are characterized, classified and examined. In every group one of these structural details is designed with use of modern composite material based on secondary raw materials (still in development process). The theory describes the current issue of thermal bridges at constructions and applicable legislative documents. The next part introduces thermal engineering analysis (based on finite element method) of structures with annotated data outputs. The another main part of thesis provides with designed innovative optimization algorithm using multi-criteria decision analysis methods, which is then practically tested on the surveyed construction details. The conclusion summarizes the results and provides with improvements based on completed research.
16
Sebastian, Johny. "A Temperature stabilised CMOS VCO based on amplitude control." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/33447.
Full textAbstract:
Speed, power and reliability of analogue integrated circuits (IC) exhibit temperature dependency through the modulation of one or several of the following variables: band gap energy of the semiconductor, mobility, carrier diffusion, current density, threshold voltage, interconnect resistance, and variability in passive components. Some of the adverse effects of temperature variations are observed in current and voltage reference circuits, and frequency drift in oscillators. Thermal instability of a voltage-controlled oscillator (VCO) is a critical design factor for radio frequency ICs, such as transceiver circuits in communication networks, data link protocols, medical wireless sensor networks and microelectromechanical resonators. For example, frequency drift in a transceiver system results in severe inter-symbol interference in a digital communications system. Minimum transconductance required to sustain oscillation is specified by Barkhausen’s stability criterion. However it is common practice to design oscillators with much more transconductance enabling self-startup. As temperature is increased, several of the variables mentioned induce additional transconductance to the oscillator. This in turn translates to a negative frequency drift.
Conventional approaches in temperature compensation involve temperature-insensitive biasing proportional-to-absolute temperature, modifying the control voltage terminal of the VCO using an appropriately generated voltage. Improved frequency stability is reported when compensation voltage closely follows the frequency drift profile of the VCO. However, several published articles link the close association between oscillation amplitude and oscillation frequency. To the knowledge of this author, few published journal articles have focused on amplitude control techniques to reduce frequency drift. This dissertation focuses on reducing the frequency drift resulting from temperature variations based on amplitude control. A corresponding hypothesis is formulated, where the research outcome proposes improved frequency stability in response to temperature variations.
In order to validate this principle, a temperature compensated VCO is designed in schematic and in layout, verified using a simulation program with integrated circuit emphasis tool using the corresponding process design kit provided by the foundry, and prototyped using standard complementary metal oxide semiconductor technology. Periodic steady state (PSS) analysis is performed using the open loop VCO with temperature as the parametric variable in five equal intervals from 0 – 125 °C. A consistent negative frequency shift is observed in every temperature interval (≈ 11 MHz), with an overall frequency drift of 57 MHz. However similar PSS analysis performed using a VCO in the temperature stabilised loop demonstrates a reduced negative frequency drift of 3.8 MHz in the first temperature interval. During the remaining temperature intervals the closed loop action of the amplitude control loop overcompensates for the negative frequency drift, resulting in an overall frequency spread of 4.8 MHz. The negative frequency drift in the first temperature interval of 0 to 25 °C is due to the fact that amplitude control is not fully effective, as the oscillation amplitude is still building up. Using the temperature stabilised loop, the overall frequency stability has improved to 16 parts per million (ppm)/°C from an uncompensated value of 189 ppm/°C.
The results obtained are critically evaluated and conclusions are drawn. Temperature stabilised VCOs are applicable in applications or technologies such as high speed-universal serial bus, serial advanced technology attachment where frequency stability requirements are less stringent. The implications of this study for the existing body of knowledge are that better temperature compensation can be obtained if any of the conventional compensation schemes is preceded by amplitude control.Dissertation (MEng)--University of Pretoria, 2013.
Electrical, Electronic and Computer Engineering
unrestricted
17
Sienkiewicz, Magdalena. "Méthodologie de localisation des défauts soft dans les circuits intégrés mixtes et analogiques par stimulation par faisceau laser : analyse de résultats des techniques dynamiques paramétriques." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14028/document.
Full textAbstract:
Cette thèse s’inscrit dans le domaine de la localisation de défauts de type «soft» dans les Circuits Intégrés (CI) analogiques et mixtes à l’aide des techniques dynamiques de stimulation laser en faible perturbation. Les résultats obtenus à l’aide de ces techniques sont très complexes à analyser dans le cas des CI analogiques et mixtes. Ce travail porte ainsi particulièrement sur le développement d’une méthodologie facilitant l’analyse des cartographies laser. Cette méthodologie est basée sur la comparaison de résultats de simulations électriques de l’interaction faisceau laser-CI avec des résultats expérimentaux (cartographies laser). L’influence des phénomènes thermique et photoélectrique sur les CI (niveau transistor) a été modélisée et simulée. La méthodologie a été validée tout d’abord sur des structures de tests simples avant d’être utilisée sur des CI complexes que l’on trouve dans le commerceThis thesis deals with Soft failure localization in the analog and mixed mode Integrated Circuits (ICs) by means of Dynamic Laser Stimulation techniques (DLS). The results obtained using these techniques are very complex to analyze in the case of analog and mixed ICs. In this work we develop a methodology which facilitates the analysis of the laser mapping. This methodology consists on combining the experimental results (laser mapping) with the electrical simulations of laser stimulation impact on the device. The influence of photoelectric and thermal phenomena on the IC (transistor level) has been modeled and simulated. The methodology has been validated primarily on test structures before being used on complex Freescale ICs existing in commerce
18
Liu, Tsung-Tang, and 劉宗棠. "Analogy of Flow and Heat Transfer and Simulation of Purge Process in a Vertical Rapid Thermal Processor." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/71168488621210264802.
Full text
19
Costa, João Maria Leonor Oliveira da Luz. "Um olhar sobre o estranho - Central Termoelétrica de Sines." Master's thesis, 2016. http://hdl.handle.net/10071/13478.
Full textAbstract:
A presente investigação teórica procura criar uma interpretação
crítica acerca da transformação da paisagem de um território
– Sines. Foi na década de 1970, com a criação do Complexo
Portuário-Industrial, que se deu o momento que melhor representa
esta alteração. Nessa época criaram-se megaestruturas que
marcaram a paisagem e promoveram uma leitura ambígua da
mesma, provocando um sentimento de estranheza a quem habitava
este lugar.
Neste sentido, estuda-se o conceito de uncanny (Freud) e
entende-se como este se relaciona com outras reflexões sobre a
modernidade. Evidencia-se a aplicação deste tema à arquitetura
e como este tem acompanhado uma revolução estética na qual a
imagem terá ganho uma importância cada vez maior. Assim , tornase necessário contextualizar o conceito de imagem como processo
e ferramenta de projeto em arquitetura de forma a compreender
como explorar, através de um método contemporâneo, a
domesticação e familiarização de uncanny.
Para comprovar estas ideias e conceitos, analisa-se um caso
de estudo específico – Central Termoelétrica de Sines – e
o seu contexto industrial no pós-guerra em Portugal. Nesta
análise procede-se a uma leitura crítica sobre a identidade e a
estranheza desta infraestrutura, relacionando-a com teorias da
modernidade associadas ao uncanny (nomadismo) e abordando
questões polémicas, como a poluição e o seu tempo de vida
útil. Compreende-se também porque é que esta infraestrutura
provoca uma sensação de estranheza e procura-se estabelecer
uma linguagem que representa esta infraestrutura através da sua
imagem, criando correspondências, associações e relações entre
temas, assuntos ou ideias – método analógicoThis theoretical investigation aims to create a critical interpretation about the transformation of a territory’s landscape - Sines. The turning point occurred during the decade of 1970, alongside the foundation of the Complexo Portuário-Industrial. At the time, mega structures were created which made an impression to the landscape and promoted an ambiguous interpretation of that place. This caused a feeling of weirdness to local habitants. Hence the concept of uncanny (Freud) is studied with the purpose of seeking to understand how the concept relates with other reflections on modern time. Equally, it aims to confirm the application of this concept to architecture and how it went along with the aesthetic revolution on which one image might have assumed a bigger importance. Thus, it becomes crucial to contextualize the image concept as a process and tool in architecture, in order to be able to understand how to explore, through a contemporary method, the uncanny’s domestication and familiarization. Conductive to prove these ideas and concepts, a specific case study is analyzed - Central Termoelétrica de Sines - along with its industrial context in post war Portugal. Furthermore, the analysis incorporates a critical reading about the identity and the weirdness of this infrastructure, associating it with modernity theories related to uncanny (nomadism) and approaching controversial issues, as pollution and its useful life time. Finally, it is also interpret the reason why this infrastructure causes a weirdness sensation and tries to establish a representative language of this infrastructure through its image, creating correspondences, associations and relations between themes, subjects or ideas - analogical method.
20
Chaugule, Abhigit. "Analysis and characterization of thermal effects in analog circuits." 2005. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1439586.
Full text
21
Rahman, Ardasheir Sayek. "Thermal effects and analysis on analog integrated circuit design /." 2008. http://hdl.handle.net/10106/1895.
Full text
22
Chang, Chi-Kun, and 張琪琨. "RFID-based thermal convection type of construction integrates analog acceleromete." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/64447672338631291689.
Full textAbstract:
碩士中華大學
機械工程學系碩士班
100
This research uses MEMS technology to integrate a thermal convection accelerometer on a RFID tag with flexible substrate such as a plastic or polyimide. Thus the accelerometer becomes a wireless sensor, the usage is very large. The fabrication process is a low temperature process. Firstly, use Cr and Ni metal thin films to make heater, and then let a standard electric current flowing through the resistor as heat source. Then deposit P-Type polysilicon in both sides of heater as thermistors. Repeat the above processes, we can use two pairs of modules to make a differential Wheatstone bridge circuit, the bridge circuit output voltage can be used to detect the vehicle acceleration. The advantage is to increase the output signal, and reduces the common mode noise and disturbance. Repeated three modules, we can measure three-dimensional acceleration motion. Such structure is very simple and without any movable parts. Besides, the heat dissipate to the environment is smaller than traditional silicon chip, because the thermal conductivity of plastic material is much smaller than that of silicon. Moreover, the key technology of this research is to integrate thermal convection accelerometer with a wireless RFID tag on the same substrate. The heater and temperature sensors are directly adhered on the substrate surface without using the traditional floating structure. So, the structure is more simple, cheaper and reliable. It can be applied for larger acceleration conditions. This research uses xenon gas for conduction the heat, its molecular weight is larger than that of carbon dioxide, so it is more inert, and can increase the sensitivity performance. Besides, the internal chamber uses semi-cylindrical rather than the conventional rectangular. The sensitivity of the new design can also increase the sensitivity and response speed.
23
Hardgrove, Craig James. "Remote Sensing of Sediments and Volatiles on the Martian Surface and Terrestrial Analog Sites." 2011. http://trace.tennessee.edu/utk_graddiss/976.
Full textAbstract:
The role of water and volatiles in the solar system is of critical interest in planetary science. Evidence for the past action of water or direct observation of water on a planetary body can indicate the potential to harbor life and is critical to human exploration of the solar system. We study two very different remote sensing techniques that address the issue of identifying water-related processes on the surface of other planetary bodies, and in particular, Mars. The first technique, combined thermal infrared and visible imaging, has been used extensively on Mars for determining the thermal inertia of surface materials. In the second part of this dissertation, we develop a technique that combines remote thermophysical and visible data sets with ground-based field investigations for the identification of sedimentary features at the surfaces of alluvial fans. Several methods for remotely identifying sedimentary features will be explored using thermal and visible images. We combine results from pre-existing ground-based studies with thermal images and ground-based field investigations to develop a robust technique to be used on a variety of alluvial fans. In the third part, we characterize the remote thermophysical and visible properties of specific classes of sedimentary features on alluvial fans using the technique developed in part two. The second remote sensing technique, neutron spectroscopy, has been used on many planetary spacecraft missions for the identification of hydrogen on planetary surfaces. The Dynamic Albedo of Neutrons (DAN) instrument on the upcoming Mars Science Laboratory rover mission represents a new type of neutron detector for planetary spacecraft, with the neutron detectors mounted to a rover on the Martian surface (as opposed to in orbit around the planetary body) and neutron counts that are binned by time, energy, and location (as opposed to just by energy and location). In chapter four, we model expected neutron energies and arrival times for geologic settings where water has altered the chemistry of the near surface using available geochemical data from the Mars Exploration Rovers (MER). Particle transport models are used to determine the sensitivity of neutron detection techniques to the variations in hydrogen abundance, hydrogen layering and chemical composition measured by MER.
24
Su, Kuo-Chin, and 蘇國欽. "The analysis and study of thermal effect and contact sensitivity for analog IC test." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/3pzc68.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系博碩士班
102
The major object of the thesis is for investigated probing contact sensitivity and thermal effect to cause testing problem. Focus on affected test items for analysis and design experiment. Then put these related test items to automatic testing system. To start action for clean on demand and Z-offset. It’s success to make testing stability and automatic control instead of manual adjustment. According to experiment results, the retest rate has been improved 29% and also improved first time pass yield. Utilization has been improved from 97.74% to 98.05%. Adaptive adjust probe mark to make zero defect in quality part. No deep probe mark and also no pad damage. For manual operation time has been improved from 450 min reduce to 235 min. In addition, for man power arrangement is from one man 20 machines to one man 30 machines due to every machine with one automatic system to monitor.
25
Sinha, Kamal Ranjan. "The thermal effects of self heating of transistors on analog amplifier design ad evaluation." 2008. http://hdl.handle.net/10106/1893.
Full text
26
Chiang-Che-Hsaing and 江哲祥. "Analy of Compound crystal growth and thermal field communications applications." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/59215360119909003946.
Full text
27
Li, Ziyi. "An Investigation of Autoxidation and DNA Thermal Cleavage by Polymethine Cyanine Dyes and Analogs in Aqueous Solutions." 2015. http://scholarworks.gsu.edu/chemistry_theses/79.
Full textAbstract:
Studies on a series of polymethine cyanine dyes and analogs (1-24) show that certain near-infrared cyanines are capable of damaging DNA in the absence of light and external reducing agents. Experimental results imply that in this DNA thermal cleavage, the cyanine reduces Cu(II) to Cu(I) which reacts with O2 to generate the reactive oxygen species (ROS) O2∙- and ∙OH. The formation of these ROS is also thought to be responsible for the irreversible bleaching of the dyes in aqueous solutions. A correlation between structural features and DNA thermal cleavage activity as well as dye bleaching is suggested. Long polymethine chains appear to confer instability to cyanines in aqueous solutions and further contribute to undesired thermal DNA cleavage. These drawbacks can be overcome by introducing an electron-withdrawing group to the polymethine bridge of the cyanine dye.
28
Wung, Shih-Hsun, and 翁世勳. "Analgy of Flow and Heat Transfer and Simulation of Purge Process in a Horizontal Rapid Thermal Processor." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/88367207079938032062.
Full text
29
Gagnon, Laurence. "Oroclines, their scale and tectonic requirements: Insights from thermo-mechanical analogue models." Thesis, 2013. http://hdl.handle.net/1828/5174.
Full textAbstract:
We use scaled 3-D thermo-mechanical analogue models to investigate the formation of oroclines (originally linear orogens now curved in map view by buckling about vertical axes). The experimental setup consists of a tank of water (the asthenosphere) on top of which rest hydrocarbon plates (the lithosphere) with strain-softening behaviours and thermo-dependent elasto-plastic properties. An electric heating element below and 4 infrared lights above produce a constant vertical (geo)thermal gradient in the plates. A horizontal piston drives constant plate motion and gives rise to a compressional stress regime. Geometric, kinematic and dynamic variables are calibrated in accordance with a set of scaling laws and proper plate composition.
Our results suggest that oroclinal buckling involves the entire lithosphere and cannot be confined to the crust only. A wide range of syn-oroclinal structures developed during buckling, including thin- to thick-skinned thrust belts, transform faults and extensional structures, as well as extensional basins and subduction zones in the lithosphere adjacent to the ribbons. During oroclinal buckling, a thrust belt forms upon complete closure of the interlimb region and is attributable to the trailing orocline limb overthrusting the leading orocline limb. An analogous syn-oroclinal thrust system characterizes the Central Iberian Orocline (CIO) of the Variscan orogen in Iberia where the north limb of the west-convex orocline exposes recumbent north-verging folds while the overriding south limb bears upright to gently north-verging folds. Our results imply that these structures developed during final closure of the CIO, and indicate that the north- and south- limbs of the CIO constitute the leading- and trailing-limbs, respectively, of an orocline that formed by overall northward translation. Modelling of magmatic arcs rotating about vertical axes yields late stage transform faults that bisect the buckling arcs. This outcome is analogous to the Panama Canal fault zone that severs the buckled Panamanian Isthmus. The hinge zones of modeled oroclines are the sites of subduction initiation, similar to subduction initiation of the Caribbean plate beneath the convex to the north, North Panamanian orocline, and of oceanic lithosphere from the Ionian Sea beneath the Calabrian orocline of Sicily.Graduate
0372
gagnonl@uvic.ca
30
Onabajo, Marvin Olufemi. "Development of Robust Analog and Mixed-Signal Circuits in the Presence of Process- Voltage-Temperature Variations." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9129.
Full textAbstract:
Continued improvements of transceiver systems-on-a-chip play a key role in the advancement of mobile telecommunication products as well as wireless systems in biomedical and remote sensing applications. This dissertation addresses the problems of escalating CMOS process variability and system complexity that diminish the reliability and testability of integrated systems, especially relating to the analog and mixed-signal blocks. The proposed design techniques and circuit-level attributes are aligned with current built-in testing and self-calibration trends for integrated transceivers. In this work, the main focus is on enhancing the performances of analog and mixed-signal blocks with digitally adjustable elements as well as with automatic analog tuning circuits, which are experimentally applied to conventional blocks in the receiver path in order to demonstrate the concepts.
The use of digitally controllable elements to compensate for variations is exemplified with two circuits. First, a distortion cancellation method for baseband operational transconductance amplifiers is proposed that enables a third-order intermodulation (IM3) improvement of up to 22dB. Fabricated in a 0.13µm CMOS process with 1.2V supply, a transconductance-capacitor lowpass filter with the linearized amplifiers has a measured IM3 below -70dB (with 0.2V peak-to-peak input signal) and 54.5dB dynamic range over its 195MHz bandwidth. The second circuit is a 3-bit two-step quantizer with adjustable reference levels, which was designed and fabricated in 0.18µm CMOS technology as part of a continuous-time SigmaDelta analog-to-digital converter system. With 5mV resolution at a 400MHz sampling frequency, the quantizer's static power dissipation is 24mW and its die area is 0.4mm^2.
An alternative to electrical power detectors is introduced by outlining a strategy for built-in testing of analog circuits with on-chip temperature sensors. Comparisons of an amplifier's measurement results at 1GHz with the measured DC voltage output of an on-chip temperature sensor show that the amplifier's power dissipation can be monitored and its 1-dB compression point can be estimated with less than 1dB error. The sensor has a tunable sensitivity up to 200mV/mW, a power detection range measured up to 16mW, and it occupies a die area of 0.012mm^2 in standard 0.18µm CMOS technology.
Finally, an analog calibration technique is discussed to lessen the mismatch between transistors in the differential high-frequency signal path of analog CMOS circuits. The proposed methodology involves auxiliary transistors that sense the existing mismatch as part of a feedback loop for error minimization. It was assessed by performing statistical Monte Carlo simulations of a differential amplifier and a double-balanced mixer designed in CMOS technologies.
31
Jaffari, Javid. "Statistical Yield Analysis and Design for Nanometer VLSI." Thesis, 2010. http://hdl.handle.net/10012/5361.
Full textAbstract:
Process variability is the pivotal factor impacting the design of high yield integrated circuits and systems in deep sub-micron CMOS technologies. The electrical and physical properties of transistors and interconnects, the building blocks of integrated circuits, are prone to significant variations that directly impact the performance and power consumption of the fabricated devices, severely impacting the manufacturing yield. However, the large number of the transistors on a single chip adds even more challenges for the analysis of the variation effects, a critical task in diagnosing the cause of failure and designing for yield. Reliable and efficient statistical analysis methodologies in various design phases are key to predict the yield before entering such an expensive fabrication process.
In this thesis, the impacts of process variations are examined at three different levels: device, circuit, and micro-architecture. The variation models are provided for each level of abstraction, and new methodologies are proposed for efficient statistical analysis and design under variation.
At the circuit level, the variability analysis of three crucial sub-blocks of today's system-on-chips, namely, digital circuits, memory cells, and analog blocks, are targeted. The accurate and efficient yield analysis of circuits is recognized as an extremely challenging task within the electronic design automation community. The large scale of the digital circuits, the extremely high yield requirement for memory cells, and the time-consuming analog circuit simulation are major concerns in the development of any statistical analysis technique. In this thesis, several sampling-based methods have been proposed for these three types of circuits to significantly improve the run-time of the traditional Monte Carlo method, without compromising accuracy. The proposed sampling-based yield analysis methods benefit from the very appealing feature of the MC method, that is, the capability to consider any complex circuit model. However, through the use and engineering of advanced variance reduction and sampling methods, ultra-fast yield estimation solutions are provided for different types of VLSI circuits. Such methods include control variate, importance sampling, correlation-controlled Latin Hypercube Sampling, and Quasi Monte Carlo.
At the device level, a methodology is proposed which introduces a variation-aware design perspective for designing MOS devices in aggressively scaled geometries. The method introduces a yield measure at the device level which targets the saturation and leakage currents of an MOS transistor. A statistical method is developed to optimize the advanced doping profiles and geometry features of a device for achieving a maximum device-level yield.
Finally, a statistical thermal analysis framework is proposed. It accounts for the process and thermal variations simultaneously, at the micro-architectural level. The analyzer is developed, based on the fact that the process variations lead to uncertain leakage power sources, so that the thermal profile, itself, would have a probabilistic nature. Therefore, by a co-process-thermal-leakage analysis, a more reliable full-chip statistical leakage power yield is calculated.