Дисертації з теми "Aluminium Beads"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-18 дисертацій для дослідження на тему "Aluminium Beads".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Sephar, Carlos Roberto. "The genetics of aluminium tolerance in soya beans Glycine max (L.) Merrill." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315191.
Повний текст джерелаNguyen, Anh Vy. "Structural Behaviour and Design of Aluminium Lipped Channel Beams Under Combined Actions." Thesis, Griffith University, 2022. http://hdl.handle.net/10072/414923.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
Full Text
Cheng, Chung-choi. "Positron beam studies of fluorine implanted gallium nitride and aluminium gallium nitride." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43278577.
Повний текст джерелаCheng, Chung-choi, and 鄭仲材. "Positron beam studies of fluorine implanted gallium nitride and aluminium gallium nitride." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43278577.
Повний текст джерелаKnorr, Nicholas J. "Fundamental studies of growth mechanisms in physical vapour deposition of aluminium." Thesis, University of Salford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365971.
Повний текст джерелаJinnapat, Apichart. "The manufacture and characterisation of aluminium foams made by investment casting using dissolvable spherical sodium chloride bead preforms." Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588085.
Повний текст джерелаKubínová, Veronika. "Vysokoškolské koleje." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392203.
Повний текст джерелаJášková, Aneta. "Penzion s kavárnou." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371954.
Повний текст джерелаSoni, Harsh. "Flocks, Flow and Fluctuations in Inanimate Matter : Simulations and Theory." Thesis, 2015. https://etd.iisc.ac.in/handle/2005/4229.
Повний текст джерелаCHANG, CHUNG-HAO, and 張中豪. "Laser processing at the Aluminium-coated glass by Bessel beams." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/b365k6.
Повний текст джерела國立中正大學
光機電整合工程研究所
105
Ultrashort pulses laser, besides water jet-based and diamond tool-based, is a common method for glass substrate cutting. It provides a kind of material modification in the focal of volume method to separate materials. This type of processing method has characteristics such as extremely small pulse width (femtoseconds or even picoseconds), the ability of fine processing in substrates (to micron scale) and the ability to process on both metal and non-metal non-transparent materials. The principle behind laser processing is to remove surface material on the substrate by laser ablation, focus inside the substrate via thin and homogenous Bessel beans and cut through substrates after various laser scans. In this study, we use optical analysis design software ASAP to create the optical system. We analyze the energy distribution on the central focus spot after the Gaussian bean passing through the lens group. From the analysis, we are able to understand the transmission distance and the beam profile characteristics of Bessel beam. We also are able to obtain the required distance for processing in work environment through different lens combinations and to discuss possible factors that will affect the process quality of Bessel beam. Through the comparison between experiment and simulation, we are not only able to find the optimal the central of spot size and depth of focus for processing substrate cutting, but also improve the completeness of the beam profile from Bessel beam. Keywords: Bessel beam, Laser processing
Tang, Jiun-Kai, and 湯竣凱. "Performance Study of Methanol Steam Reformer using Commercial Catalyst Dispersed by Aluminum Beads." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/9shpj3.
Повний текст джерела大同大學
化學工程學系(所)
95
In a methanol steam reformer, the endothermic reactions are carried out, therefore, a large quantity of energy needs to provide in time to maintain the reactions at a constant temperature. In order to transfer the heat from the heat source usually located at the outer of the reactor tube into the catalyst bed in the reactor, we evaluate the heat transfer capability of the available catalyst dispersion mediums including the aluminum beads and r-Al2O3. The reforming reactions were carried out in a tubular reactor packed with the commercial MDC III catalysts and the adopted dispersion medium to study the effects of dispersion medium on the conversion of methanol and the selectivity of CO over CO2 at the same operating conditions (the ratio of water over methanol (S/C) equals to one, the operating temperature equals to 250℃). The experimental results show that adopting the aluminum beads can not only improve the heat transfer capability but also increase the methanol conversion to obtain a higher hydrogen production rate, although the CO selectivity in the product stream is some how higher than the reactions carried out adopting the r-Al2O3 as the dispersion medium. Furthermore, the full factor experimental design was applied to carry out the experiments to study the effects of the control factors (The first control factor was different catalyst loading at the upper and lower section of the reactor, while the second control factor was the location the temperature sensor at the upper and lower section of the reactor) on the performance of the reformer. On the basis of the defined objective function (the desirability in terms of the cumulative quantities of hydrogen and CO production), the experimental results show that it is incentive to adopt a uniformly distributed catalysts with the dispersion medium when Wc/F is greater than 0.011(kg s/mmol) . Otherwise, it is more incentive to adopt the paring of the operating control factors: the upper section of the reactor is loaded with less catalysts and the temperature is located at the upper section.
Wattal, Reeta. "Bead geometry and shape relationship in GMAW of aluminium alloy 7005." Thesis, 2006. http://localhost:8080/iit/handle/2074/5171.
Повний текст джерелаSilva, Edson Vinicius Garcia da. "Comparative study of vibration measuring techniques applied to Aluminum beams with localized damage." Master's thesis, 2017. http://hdl.handle.net/10198/22884.
Повний текст джерелаWhen a structural damage changes the characteristics of stiffness and mass of a mechanical system, the dynamic behavior of this beam will also change. Only a few studies about the correlation between damage and the effect caused in dynamic behavior can be found. Based on this, this study will analyze the behavior of the natural frequencies and damping ratios of four aluminum beams, with and without damages. This work aims to determine the error between the two methods of data acquisition and the effects of the damage inflicted on the shape modes, natural frequencies and damping ratios for each beam. To achieve the purposes, initially, a numerical FEM simulation will be performed, followed by experimental impact tests, aiming to obtain the estimated natural frequencies and damping ratios. After this, damages will be made on these beams and the impact tests will be repeated for each beam. The FEM analysis will be performed using Ansys. For the impact tests, two data acquirement methods will be used during the impact testing, the first, using accelerometers to obtain the vibration response, the second using a Brüel & Kjær’s sound level meter. The obtained data will be compared and will be possible to determinate the error between the natural frequencies measured using both methods. The results obtained will be used to correlates the dynamic behavior with the damages inflicted on the beams. This paper allowed analyzing the usage viability of the sound level meter to measure the output of a vibrating system, considering certain limitations. In addition, the damage effects on the natural frequencies of the beams.
Quando um dano altera as características de massa e rigidez de um sistema (uma viga, por exemplo), seu comportamento dinâmico também é afetado. O estudo dos efeitos do dano infligido no comportamento modal é relativamente recente, tendo poucos estudos correlacionando o dano com seus efeitos em vigas. Baseado nisso, este estudo visa analisar o comportamento e variação do valor das frequências naturais e dos fatores de amortecimento de quatro vigas de alumínio com e sem danos. Este trabalho tem por objetivo determinar: o erro entre as medições efetuadas utilizando ambos os métodos de obtenção da resposta de vibração das vigas e os efeitos dos danos causados no comportamento modal do sistema analisado (modos de vibração, frequências naturais e fatores de amortecimento). Para tal, incialmente, uma simulação numérica utilizando elementos finitos será efetuada, seguida por testes de impacto, com o objetivo de obter as frequências naturais e os fatores de amortecimento para cada caso. A simulação numérica será efetuada utilizando o software Ansys e os testes de impacto utilizarão dois métodos de aquisição da resposta do sistema: utilizando acelerômetros e um medidor de pressão sonora. Os dados obtidos serão comparados e será possível determinar o erro entre os métodos de medição utilizados. Os resultados obtidos também serão utilizados para analisar os efeitos dos danos no comportamento dinâmico das vigas utilizadas. A elaboração deste trabalho possibilitou averiguar a viabilidade do uso de um medidor de pressão sonora para medição de vibrações, dentro de seus limites de utilização e suas limitações. Também foi possível analisar os efeitos dos danos nos valores de frequências naturais das vigas analisadas.
Roberts-Tompkins, Altramese L. "Viscoelastic Analysis of Sandwich Beams Having Aluminum and Fiber-reinforced Polymer Skins with a Polystyrene Foam Core." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7634.
Повний текст джерелаCheng, Ya-Chi, and 鄭雅琪. "Mechanical Properties Measurement of Nano-Scale Aluminum Films on the Novel Paddle Cantilever Beams Using Laser Deflection." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/47962115320152240914.
Повний текст джерела國立彰化師範大學
機電工程學系
97
In this paper the test microstructure was designed the triangular cantilever beam and fabricated by the standard C-MOS processes, which can improve stress distribution non-uniform problem and the thickness regime of deposited metal thin film on its surface could reduce to several nanometers. In order to reduce the measure error and calculation complex due to the contact force (like indenter), the driving system was used electrostatic force to making the paddle cantilever beam bend and the deflection of paddle cantilever beam due to the electrostatic force was measured by a point laser reflected from paddle plate into the Position Sensing Detector (PSD). According to the displacement of the laser point on the PSD using a simple geometry calculation the deflection of paddle cantilever will be obtained. Than, we figure out the stress versus the stain and the Young’s Modulus of the thin films. It presents the mechanical properties of thin films.
Wu, Min-Shiuan, and 吳忞軒. "Interfacial Crack Behavior Analysis of Glass/Polypropylene/Aluminum Foam Sandwich Beams Using Mixed-Mode Bending (MMB) Method." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/01583283603799025913.
Повний текст джерела國立臺灣海洋大學
機械與機電工程學系
101
The face/core interfacial crack behavior of the sandwich beams with glass/polypropylene faces and aluminum foam cores was experimentally studied in this thesis using mixed-Mode bending (MMB) method. The effects of the mixed Mode at the crack tips and the core heights on the critical loads and the critical strain energy release rates at the interfaces of the studied sandwich structures under the static loading were investigated first. The mixed Mode at the crack tips can be adjusted by changing the length of level arm of the MMB configuration. The finite element method was employed to determine the Mode-mixity at the crack tips, which was expressed using the phase angles. Secondly, the relationship between the crack propagation rate and the range of strain energy release rate for the studied pre-cracked sandwich beams was experimentally determined. The effects of the mixed Mode at the crack tips and the core heights on the crack propagation rates were also studied. In this study, the beam theory was used to obtain the compliance of the pre-cracked specimen under MMB, and correspondingly the strain energy release rate can be determined. Experimental results show that in the static tests, the critical loads and the critical strain energy release rates decrease as the phase angles at the crack tips of the studied specimens increase. In the fatigue tests, the crack propagation rate of the sandwich specimen with thinner core height is less than that with thicker core height. Furthermore, the ratios of the tensile Mode to the shear Mode at the crack tips have slight effect on the crack growth rates of the studied sandwich specimens.
Chien-YuPan and 潘建宇. "A Study of Microstructure and Mechanical Properties of Aluminum Alloy Weld Bead with Different Si-Cu/Mg Ratio." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/rmeaq4.
Повний текст джерела林奕辰. "Finite Element Analysis on the Interfacial Crack Behavior of Glass/Polypropylene/Aluminum Foam Sandwich Beams under Mixed-Mode Bending (MMB)." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/74277857541682235197.
Повний текст джерела國立臺灣海洋大學
機械與機電工程學系
101
Finite element method was employed in this thesis to analyze the face/core interfacial crack behavior of the sandwich beams with glass/polypropylene laminate faces and aluminum foam cores under mixed-mode bending (MMB). The finite element code ANSYS was employed to study the effects of core thicknesses, crack lengths, the lengths of level arms employed in the MMB loading configuration on the specimen compliance, local mixed modes, and the strain energy release rates at the interfaces. The beam theory was also used in the study to obtain the specimen compliance, local mixed mode and the strain energy release rate, which were compared with the results of finite element analyses. The mixed mode at the crack tip can be adjusted by changing the level arms of the MMB loading configuration, and the local mixed modes at the crack tips can be calculated using the finite element analysis and expressed using the phase angles. The finite element simulated results of the specimen compliances was also compared with the experiment results. The finite element results of the specimen compliances describe more accurate specimen compliance behaviors than the theoretical solution. Furthermore, the effects of the lengths of the level arm in MMB configuration, detailed dimensions of the specimens, and the mechanical properties of the face/core materials on the specimen compliances are significant. The mixed modes at the crack tips were found to remain constant when the normalized crack lengths are larger than 0.2. The larger length of level arms and larger core heights were found to increase the mode I loading in the mixed mode at the crack tips.