Dissertations / Theses on the topic 'Cooking Equipment and supplies Design'
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1
Bennink, Dirk. "Design of solids separation equipment : a thesis." Thesis, Queensland University of Technology, 1989. https://eprints.qut.edu.au/36450/1/36450_Bennink_1989.pdf.
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This work covers a reassessment of the 'Hot Break'
separation problem by a mechanical engineer from outside the
brewing industry. The solid-liquid separation problem was
therefore investigated without prior knowledge of
constraints or current practices.
During the brewing of beer an unwanted, insoluble
precipitate, 'trub' is formed, reported to have undesirable
effects on the finished beer quality.
The existing equipment, 'whirlpool' separators, designed to
eliminate this 'trub' performed poorly, allowing much of the
precipitate to be carried over to subsequent processes.
To remedy the problem, a program to either:
1. design suitable replacement separators or;
2 • modify existing separators to enhance their
performance,
was pursued.
To evaluate possible alternative separators determination of
the relevant physical (solid, liquid) properties,
measurement of the process parameters at peak production,
and review of the chemical constraints was necessary.
Performance of the current whirlpool separators was
ascertained to establish the extent of the ~xisting problem.
Existing efficiencies set a benchmark for comparison against
proposed alternatives.
Through exhaustiv~ literature review, consultive advice, a
series of experiments and rig testing, an extensive range of
separation techniques was evaluated, A review of over
forty-five reports on whirlpool performance and design
practices, the majority of which being the basis of doctoral dissertations, combined with the evaluation of a third
whirlpool at Milton Brewery revealed whirlpools to be the
most suitable and logical choice.
It seemed that the inherent problems in whirlpool design
stem from the haphazard approach adopted by the brewing
industry. To redress this problem an exp~rimental program
to optimize whirlpool tank geometry and operation was
initiated. Both experimental and hardware design were
fundamentally different to all previous endeavors to
establish whirlpool design guidelines. A pilot plant was
designed and commissioned such that direct measurement of
the 'whirlpool' response independent of other secondary
effects was possible.
The experimental program produced · over two hundred
comparative whirlpool indices over a range of geometric and
operational configurations. These suggested that whirlpool
performance could be optimised in shallow vessels using low
inlet velocities.
Finally, the need for secondary separators to be used in
conjunction with whirlpool tanks would diminish with
improved primary separation.
2
Aspelund, Kristinn A. "Optimization of plate-fin-and-tube condenser performance and design for refrigerant R-410A air-conditioner." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/19488.
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Schmid, Volker. "Design of a Two-Chamber-NO2-Fluorescence-Cell." PDXScholar, 1996. https://pdxscholar.library.pdx.edu/open_access_etds/5263.
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Nitrogen oxides control the photochemical production of ozone 03 in the lower atmosphere and influence the concentration of the hydroxyl radical HO in the troposphere. As an important member of the nitrogen oxide family, N02 plays a significant role in serving as the only known source of ozone (through photolysis) in the lower atmosphere and as sink for HO via formation of nitric acid. Therefore, accurate measurements of nitrogen dioxide are essential for the understanding of the processes that determine the distribution of tropospheric ozone and for assessing the impact of human activity on the troposphere. Although reliable and sensitive techniques for the direct measurement of nitric oxide NO have been developed, these results could not be fully applied to direct N02 measurements. The purpose of the present study was to further develop a low pressure laser-excited fluorescence technique for measuring N02 by introducing the idea of a Two-Chamber-Fluorescence-Cell. Theoretical considerations of the performance of such a cell and the flow regime within the cell were done in order to assess the optimum cell design and the conditions for optimum operation. Measurements on a provided two-chambered test cell were done to verify the theoretical predictions made. This test cell has been explored with a Nd:Y AG pumped dye laser (100mW@564nm, 30Hz) and a supplied N02 concentration of lOOppm. The theoretical results suggest that the concept of a Two-Chamber-N02- Fluorescence-Cell yields an improved sensitivity compared to present direct techniques for measuring N02 In addition, experimental results give a better understanding of how to realize the initial idea of an operating Two-Chamber-N02- Fluorescence-Cell.
4
Cronkite, Patrick Joseph 1961. "Design methods for focusing grating coupler using holographic optical elements." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276863.
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Light can be coupled out of a waveguide to a focused point by a focusing grating coupler and has possible applications in optical data storage. The grating can be fabricated with either e-beam techniques or holographic techniques. Two design methods are demonstrated that model the focusing grating coupler with holographic optical elements. Both methods take a geometrical optics approach to designing the holographic optical elements and both methods make use of commercially available ray trace programs. The first method uses complicated non-rotationally symmetric construction optics and requires either a modified ray trace program or special user defined surfaces. The second method involves a much simpler approach which did not require any changes to an existing ray trace program and requires only rotationally symmetric elements to correct the aberrations.
5
Sadler, Emma May. "Design analysis of a finned-tube condenser for a residential air-conditioner using R-22." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/17951.
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Wang, Zheng. "The design and implementation of a computer-controlled pneumatic device to replace the deadweight in standard exercise equipment." Thesis, Cape Peninsula University of Technology, 2007. http://hdl.handle.net/20.500.11838/1384.
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Thesis (MTech (Information Technology))--Cape Peninsula University of Technology, 2007The increasingly sedentary lifestyle of the past 30 years has contributed to declining health. Consequently, exercise is vital for good health maintenance. The global Health and Fitness Industry repeatedly indicates the need for optimally managed exercise with accurate information feedback. Compared to other industries, the fitness industry is lagging behind in incorporating Information Technology into its operations. On the other hand, the most current exercise equipment impose fixed-trajectory exercise on users with the dominance of static equipment designs. These exercise equipment are normally deadweight-based equipment. In deadweight-based exercise equipment, the weights generally can be changed only when the equipment is inactive. Therefore, a more novel exercise environment is required for current exercisers in the fitness industry. This thesis explores to develop a computer-controlled pneumatic dynamic resistance exercise equipment with onboard data management. This new technology optimises exercise effectiveness for users. Exercisers will have advanced diagnostic capacity, and will capture user data which can be manipulated into meaningful information for use by Health and Fitness Industry stakeholders. This thesis will explore all the key concepts about computer-controlled equipment. The key concepts to be investigated will include FX (force-displacement) control technology, pneumatic system control, fail-safe mechanics, and Graphical User Interface design. The primary aim of the project is to replicate and enhance the functionality, performance, and sensation of deadweight-based equipment. A further aim of the project is to investigate the feasibility of designing a compact retrofit-able pneumatic unit to replace the deadweights of existing standard exercise equipment. The computer control will be implemented on a "National Instruments PXI" computer featuring Data Acquisition and Control (DAQAC) capacity, and the software will be implemented using "LabVIEW 7.0', which is a graphic object-oriented computer language developed to facilitate hardware I software communications.
7
Spyrou, Evangelos. "The effect of shell geometry on the impact attenuating capabilities of ice hockey helmets relative to liner structural characteristics and impact conditions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29578.pdf.
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Schmitt, Robert Joseph. "The design of a flexible fixturing system." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/17958.
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McNeely, James Noah. "The design of a mechanical device for making baby food." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/23159.
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Lorenzen, Bruce Robert 1959. "DESIGN AND DEVELOPMENT OF A SUBSURFACE TRICKLE LATERAL EXTRACTION DEVICE." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276473.
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A tractor mounted three-point hitch implement was developed to extract and collect subsurface trickle irrigation laterals from the soil. Power to the implement was supplied by the tractor hydraulic system to the three-point hitch and two remote hydraulic circuits. In operation, the implement loosened the soil around the lateral, extracted the tubing from the soil, wound it on a reel assembly, and then dropped the roll of tubing at the end of the row. Draft power requirements averaged 14.5 kW (19.4 hp) and hydraulic power averaged 0.56 kW (.75 hp) when the one row implement was operated at 7.2 km/h (4.5 mph). Field capacity of the one row implement averaged 0.19 ha/hr (.47 ac/hr) when operated in 100 m (328 ft) long rows.
11
Webster, James. "The perception of comfort and fit of personal protective equipment in sport." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6242.
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During the design of sports equipment, the main focus is usually on physical performance attributes, neglecting key subjective factors such as feel and comfort. The personal protective equipment worn in sport is a typical example, where injury prevention has taken precedence over user comfort, but it is anticipated that with a new approach to the design process, comfort can be improved without sacrificing protection. Using cricket leg guards and taekwondo chest guards as an example, this study aimed to develop a systematic method for assessing user perceptions and incorporating them into the design process. Players perceptions of the factors that influence the comfort of cricket leg guards and taekwondo chest guards were elicited through the use of co-discovery sessions, focus groups and individual interviews, and analysed through an inductive process to produce a comfort model. The relative importance of each different comfort dimension was identified through the use of an online questionnaire utilising the analytical hierarchy process method. Through the combination of these methods, six general dimensions were identified with a weighting regarding the amount to which each one determines a user's perceived comfort. For both cricket and taekwondo, the majority of players ranked Fit as the most important factor affecting comfort. Experimental procedures were developed to objectively test the Fit of cricket leg guards, with regards to batting kinematics, running performance and contact pressure. These methods were combined with subjective assessments of leg guard performance, to determine if there was a relationship between users perceived comfort and objective test results. It was found that shot ROM and performance were not significantly affected by cricket leg guards, despite perceptions of increased restriction whilst wearing certain pads. Wearing cricket leg guards was found to significantly decrease running performance when compared to running without pads (p<0.05). In addition, it was found that the degree of impedance depended on pad design and could not solely be attributed to additional mass. These results correlated with the subjective assessment of three different leg guards, with respondents identifying the pad which had the largest influence on their running biomechanics and impeded their performance the most, as the most restrictive pad. Contact pressure under the pad and straps was also measured for four different leg guards whilst running. The results found that the top strap applied the greatest amount of pressure to the leg, especially at the point of maximum knee flexion. The peak pressure under the top strap was found to reach up to three times that of any other area of the pad. These results were reflected in the subjective assessment of the leg guards, with all nine subjects identifying the top strap as an area of discomfort for certain pads. The results also suggested there was a preference for pads with a larger more consistent contact area, as pad movement was perceived to increase when contact area variation was greater. Finally the results from this research were used to develop a product design specification (PDS) for a cricket leg guard, specifying size, mass, contact pressure and shape. The PDS was used to develop a concept design which would maximise comfort, whilst maintaining protection.
12
Wright, Monifa Fela. "Plate-Fin-And-Tube condenser perfomance and design for a refrigerant R-410A air-conditioner." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/17296.
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Fisher, Henry Donald 1943. "DESIGN OF REVIEW CONSOLE FOR RADIOLOGY APPLICATIONS (DISPLAY, PACS)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/291634.
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Zuo, Yiying 1974. "Design, analysis, and implementation of multi-port refraction based electro-optic switches." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103035.
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Electro-optic (EO) beam deflectors are voltage-controlled devices widely used for scanning and switching applications. For example, high-speed, low-loss optical switches aimed at future optical networks can be built on EO deflectors. Novel EO deflectors distinguish themselves with a much-improved steering performance, high-speed response and simple fabrication requirements. Patterned ferroelectric crystals such as LiTaO3 are first poled to provide the required prism shaped domain structures. The application of an electrical field across the entire crystal can then be used to drive the trajectory of the beam as it travels through the poled wafer. The electric field induces an index change of opposite magnitude on the adjacent domain regions in the EO device, causing the optical beam to refract at the interfaces.Although rectangular geometry is extensively employed in EO devices, nonrectangular scanners have demonstrated better deflection performance. Two new nonrectangular geometries capable of further enhancing the deflection performance of EO beam scanners, proposed in this dissertation, were constructed. Their parabola and half-horn geometries provide 2-3 degrees of steering, which is 2-3 times greater than the steering provided by rectangular deflectors.
EO deflectors based on the parabola and the half-horn geometries, which can provide larger deflection angles, were built. These devices demonstrated a deflection angle of 3.1°, less than 5 dB of insertion loss from fiber to fiber, and -40 dB of crosstalk.
Two packaged optical switches using rectangular EO deflectors were demonstrated. By combining these EO deflectors with fiber collimators and high voltage packaging, high speed optical switches were built and characterized. The switch design was based on a 500mum z-cut LiTaO3 single crystal wafer fabricated using the domain inversion method. The 1x2 switch had a maximum deflection angle of 1.22° with an applied voltage of 1.1 kV and the 1x4 switch had a maximum deviation angle of 2.14°, with an applied voltage of 1 kV. The average insertion loss and crosstalk figures were 2.36 dB and -36 dB, respectively. The worst case switching time was 86 ns.
15
Reyes, Salvador Byron Fernando. "DEVELOPMENT OF A HIGH-PRESSURE, HIGH-TEMPERATURE SUPERHEATED STEAM SYSTEM (WATER TREATMENT, VAPORIZER, THERMAL DESIGN, MODELING)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275460.
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Brinks, Raymond Gerald 1960. "A REPROGRAMMABLE HIGH SPEED INTERFACE DESIGN FOR A PICTURE ARCHIVING AND COMMUNICATION SYSTEM." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276488.
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High resolution imaging devices have made a digital medical archiving system feasible. The large volumes of information generated must be stored and retrieved at high data rates in order to insure the timely diagnosis of patients. This creates some unique technological challenges that must be resolved, including the problem dealing with multiple vendor products interacting in one environment. The high speed interface card design presented in this thesis is able to deal with different computer host busses as well as different interprocessor communication protocols. The ACR-NEMA standard has been implemented in the design as one possible network protocol that provides a solution that can be easily adapted to different vendors. The design has been analyzed using the Network II.5 simulation language. The simulation was performed to insure that the original objectives are met and to determine the impact on the protocols rated throughput.
17
Sekerak, Edward Michael 1959. "Fluorescence and elastic scattering from laser dye-filled capillaries." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277121.
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We investigated the elastic scattering and fluorescence from laser dye solutions inside 5000, 1100, and 96.5 micron inner-diameter hollow-core capillaries. Incident 4416 A laser illumination of Coumarin 7 dye dissolved in ethanol caused fluorescence from approximately 4600 to 6000 A. This was studied over an angular range from 0° to 360°. A light scattering nephelometer coupled with a spectrometer gave intensity measurements as functions of wavelength (at fixed detection angles) and angle (at fixed wavelengths), while the illumination source, dye-filled capillary, and detector remained stationary. We saw capillary size and detection-angle dependence of the fluorescence and elastic scattering. Results show that angular variations of the elastic scattering and emitted fluorescence can be used to determine an optimum detection angle from the capillary with respect to the incident illumination direction. This work is important in the design and execution of Capillary Zone Electrophoresis (CZE) experiments.
18
Minkley, Warick. "Analysis of restricted earth fault relay application within a shunt capacitor bank design impacting on protection stability." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1021106.
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This research is aimed at analyzing the performance of the restricted earth fault relay used on a 400kV capacitor bank scheme used on the Eskom Transmission network. After the commissioning of two Capacitor Banks using the above mentioned scheme design the plant was energized. As a result of the energization the Shunt Capacitor Bank (SCB) then experienced spurious trips. The cause of the trips was found to be the operation of the restricted earth fault relay. In this research project, restricted earth fault protection on SCBs in the Eskom Transmission environment will be the area of interest. The proposed research will analyze the current SCB protection scheme in service specifically looking at the restricted earth fault circuit design and relay performance. An equivalent model of the SCB from primary plant perspective based on theory will be derived. Recording and analyzing of Comtrade transient waveforms respectively, when the bank is nergized, will be done in order to provide a reference base to work from. Manual alculations of various parameters from the derived model including transient inrush currents and fault currents will be performed to access applicable scheme parameters. Further calculations will include the voltage setting for the restricted earth fault relay. As a result of the analysis a recommendation will be made on a viable solution or a revised design will be put forward, based on the results, to improve the scheme’s performance. The protection scheme is used on the two 400kV 100MVAR capacitor banks 11 and 12 at Hydra Substation.
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Mamedes, Clayton Rosa 1983. "Design sonoro e interação em instalações audiovisuais." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/285310.
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Orientadores: Denise Hortência Lopes Garcia, Jônatas ManzolliTese (doutorado) - Universidade Estadual de Campinas, Instituto de Artes
Made available in DSpace on 2018-08-27T20:30:38Z (GMT). No. of bitstreams: 1 Mamedes_ClaytonRosa_D.pdf: 10108591 bytes, checksum: 26cc15811eccc58549c0ee63faad6472 (MD5) Previous issue date: 2015
Resumo: A presente tese descreve o processo criativo das instalações audiovisuais interativas Abstrações, Cerejeira e Caminho das águas, relacionando-as ao objetivo principal da pesquisa, que consiste em analisar os mecanismos de integração entre o projeto conceitual de cada instalação, seu design sonoro e os processos que modelam a interação dos visitantes com a obra. Este objetivo é alcançado através de uma abordagem prática ao processo de pesquisa, a qual foi realizada através da criação de novas obras e a respectiva avaliação sobre o comportamento dos visitantes, processo repetido a cada etapa deste trabalho. O trabalho contempla a análise e a localização de nossas referências para os conceitos de instalações, design sonoro e interatividade. Apresentamos uma proposta para estruturação do design sonoro baseada na espectro-morfologia de Denis Smalley, utilizando este conjunto teórico como modelo para estruturar a relação entre o som e o conteúdo referencial da obra, e entre o som e o modelo interativo que se pretende abrir aos visitantes. Implementamos um conjunto de descritores de propriedades físicas para o movimento e desenvolvemos um conjunto de descritores baseados na fusão de dados sobre as propriedades físicas do movimento, com a intenção de descrever as classes de Esforço para a Análise de Movimento Laban. Estes descritores objetivam suprir deficiências do modelo interativo utilizado no início da pesquisa, durante o desenvolvimento das instalações Abstrações e Cerejeira. A instalação Caminho das águas integra os desenvolvimentos alcançados pela pesquisa: uma nova abordagem para a relação entre o projeto conceitual da obra, seu design sonoro e o modelo interativo revisado. Um extenso estudo com participantes aplicado sobre esta instalação permitiu avaliarmos os resultados alcançados a partir das hipóteses levantadas durante o desenvolvimento da pesquisa
Abstract: This thesis presents the creative process of the interactive audiovisual installations Abstrações, Cerejeira and Caminho das águas, relating them to the main objective of the research, which consists in the analysis of the models that integrate the conceptual project of each installation, its sound design and the interactive processes that model the relation between visitors and the work. This objective was achieved through a practical approach to the research process and was implemented by the designing of new installations and the respective evaluation about the behavior of visitors. This process was repeated at each step of the research. This work includes the analysis and origin of our references to the concepts of installations, sound design and interactivity. We present a proposal to structure sound design based on the spectro-morphology developed by Denis Smalley. We propose the use of this theoretical corpus as a model to structure the relation between the sound and the referential content of the work, and between the sound and the interactive model that is intended to be open for visitors' participation. We have implemented a set of descriptors to retrieve physical properties of the movement. We also developed a set of descriptors based on data fusion from these physical properties, intending to describe the classes of Effort for the Laban Movement Analysis. These descriptors aim to fulfill shortcomings observed in the interactive model adopted in the early part of the research, specifically during the development of the installations Abstrações e Cerejeira. The installation Caminho das águas integrates the developments achieved by this research: a new approach to the relation among the conceptual project of a work, its sound design and the interactive model adopted. An extensive study with participants applied over this installation enabled us to evaluate the results achieved from the hypotheses raised during the development of the research
Doutorado
Processos Criativos
Doutor em Música
20
Patel, Umesh. "Control authority and the design of active controllers for buffet suppression of the F-15 and F/A-18." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/12161.
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Campbell, Allan J. "Design and evaluation of liquid swine manure injectors for potato nutrient placement." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0025/NQ50124.pdf.
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Nematbakhsh, Mohammed Ali. "Design and performance evaluation of a high-speed fiber optic integrated computer network for imaging communication systems." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184597.
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In recent years, a growing number of diagnostic examinations in a hospital are being generated by digitally formatted imaging modalities. The evolution of these systems has led to the development of a totally digitized imaging system, which is called Picture Archiving and Communication System (PACS). A high speed computer network plays a very important role in the design of a Picture Archiving and Communication System. The computer network must not only offer a high data rate, but also it must be structured to satisfy the PACS requirements efficiently. In this dissertation, a computer network, called PACnet, is proposed for PACS. The PACnet is designed to carry image, voice, image pointing overlay, and intermittent data over a 200 Mbps dual fiber optic ring network. The PACnet provides a data packet channel and image and voice channels based on Time Division Multiple Access (TDMA) technique. The intermittent data is transmitted over a data packet channel using a modified token passing scheme. The voice and image pointing overlay are transferred between two stations in real-time to support the consultive nature of a radiology department using circuit switching techniques. Typical 50 mega-bit images are transmitted over the image channel in less than a second using circuit switching techniques. A technique, called adaptive variable frame size, is developed for PACnet to achieve high network utilization and short response time. This technique allows the data packet traffic to use any residual voice or image traffic momentarily available due to variation in voice traffic or absence of images. To achieve optimal design parameters for network and interfaces, the PACnet is also simulated under different conditions.
23
Argon, Cenk. "Turbo product codes for optical communications and data storage." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15350.
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Liu, Li, and 劉荔. "Compact planar UWB antennas for wireless device applications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/207199.
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The thesis report presents the designs of compact planar ultra-wideband (UWB) antennas for wireless devices applications. Three main designs of UWB antennas are studied, namely, single UWB antennas, UWB multiple-input-multiple-out(MIMO)antennas, and transparent UWB antennas on the screens of mobile phones.
For single UWB antennas, the designs of two compact planar monopole antennas with compact sizes of 26×28 mm2and 30×39.3mm2are presented. The UWB operations of the antennas are achieved using a ground slot under the feed line, offsetting the feed line and the radiator from the middle of the ground plane and smoothly transforming the feed line. Simulation and measurement show that the two antennas can achieve an ultra-wide bandwidth with approximately omnidirectional patterns. A deep notch-band in5.1-5.85 GHz is created in one of the UWB antennas by employing two pairs of meander lines (MLs), one pair being close to the feed line and the other pair along the upper edge of the ground plane. At the notch frequency, the simulated efficiency is only 4%.
Three compact UWB-MIMO antennas with very compact sizes of 26×40 〖mm〗^2, 21×38 〖mm〗^2, and 22×36 〖mm〗^2 are designed. Each of them is designed using two UWB antenna elements perpendicularly or symmetrically placed. Different techniques such as using ground stubs besides the radiators, cutting inclined slots on the ground, and adding a T-shaped protruding from ground are proposed to lower mutual coupling between the two antenna elements. One of the antennas is designed to generate a notched band in 5.15-5.85 GHz using two ground strips. Simulation and measurement results show that these antennas can cover the entire UWB of 3.1-10.6GHz with mutual coupling of less than -15 dB, and envelope correlation coefficient of less than 0.1.
An UWB antenna is designed using a transparent conductive film for applications on mobile phone screens. The effects of a finger touching the screen are studied. Results show that, with the radiator on the bottom side of the screen and a thin film with a thickness of 0.05 mm on the top side to separate the finger and the antenna, the effects of the finger can be minimized.
In measurement of monopole antennas with small ground planes, due to the feeding cable used, there are always discrepancies between the simulated and measured results in radiation patterns, efficiencies, and gains at lower frequencies. To verify that the discrepancies in the results of these studies are indeed due to the feeding cable used in measurement, the models of the feeding cables are developed and used for simulation. Results show that, by using the cable model, the simulated and measured results in radiation patterns, efficiencies, and gains agree very well.published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
25
Sun, Yiye, and 孫憶業. "Design of UWB and multiple-band monopole antennas for body-centric wireless communications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/207208.
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This thesis presents the designs of Ultra-wideband (UWB) monopole antennas, textile monopole antennas and transparent UWB textile antennas using planar technology for body-centric wireless communications (BCWC).
A planar antenna designed using offset-fed and slotted ground plane to extend the operating bandwidth for the industrial, scientific and medical (ISM)band and UWB is proposed. Results show that the antenna can achieve a bandwidth from 2.38 to 14.5 GHz with omni-directional radiation patterns in the E-plane. Agroup of nine planar UWB monopole antennas using different radiator shapes such as triangle, rectangle, square, annual ring, circle, horizontal ellipse, vertical ellipse, pentagon and hexagon for BCWC is studied using computer simulation and measurement. Results show that the monopole antenna having a vertical-elliptical-shape radiator has a relatively better performance than other monopole antennas.
Three textile antennas fabricated on fabric materials are studied. The first design is a triple-band textile antenna for wireless-local-area network (WLAN) and worldwide interoperability for microwave access (WiMAX) wireless communication applications. The radiator is composed of two branches and a short stub to generate the resonances at about 2.45, 3.5 and 5.5 GHz, respectively. Simulated and measured results show that the three frequency bands can be set independently. The second design is an UWB antenna consisting of a circular radiator, a tapered feed line and a slotted ground plane. Results show that the antenna can achieve a bandwidth of 3 to 12 GHz. The third design is a compact belt-loop UWB antenna with microstrip-fed. The antenna has a simple elliptical-shaped radiator, a three-step staircase on both sides of the feed line and a slot on the ground plane. It has a very compactsize of 11×40=440 mm2and can still achieve a bandwidth of 3.1 to 12.8 GHz. To emulate the on-body conditions, the two UWB antennas are studied in the bending and crumpling conditions due to the curvature of human body. Results show that both UWB textile antennas have quite stable performances throughout the UWB band.
The two UWB textile antennas are re-designed using a transparent conductive film (TCF)as the radiator and ground plane on fabric substrate. Results show that the measured reflection coefficients of transparent antennas agree well with the simulated results. However, the measured radiation patterns have large discrepancies with the simulated results, which are mainly due to the uncertain electric properties of TCF in radio frequency. Results show that the antennas have a better performance, in terms ofbandwidth, peak gain and radiation efficiency ,than those of other transparent antennas studied before, making our proposed antennas suitable for body-centric wireless communications.published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
26
Kopeloff, Leonardo. "Modern control theory application in mill main drive design." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50037.
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Modern Control Theory is applied to analyze an existing aluminum mill drive, which was originally designed by Classical Methods.
The system is studied with Optimal Control and z-transform zero-pole locus tools.
The results and also the original design are compared with the performance of simulation. The models are built with the transition matrix and iterative procedures.
Conclusions about the appropriated design methods and improvements to the control scheme result from the investigation.Master of Science
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Bibby, Lee. "Improving design management techniques in construction." Thesis, Loughborough University, 2003. https://dspace.lboro.ac.uk/2134/793.
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Recent years has seen a significant drive away from traditional procurement routes with contractors finding themselves with an increasing responsibility for control of design - a process they have had little experience in managing. They now have to adapt accordingly. The learning curve is steep, not least because many projects must now be delivered fast track while co-ordinating increasingly complex fabric and content of buildings without a platform of accepted good practice to manage the design process. This is a major factor preventing the UK construction industry from delivering projects on time, to budget and to the specified quality. There is a need to educate an increasing number of people in design management techniques to equip them to manage today's fast moving and demanding projects. However, many current design management tools are insufficiently developed for industry application. Therefore, to improve design management in the industry, current techniques must be modified to align them with the needs of the modern design manager. This research has developed and tested a training initiative aimed at improving design management practice within a major UK Design and Construct Contractor. It comprises a Design Management Handbook, Design Management Training, Team Support and Project Monitoring. The Design Management Handbook is the core of the training initiative. It addresses critical aspects of design management practice and provides design management tools. Training provides guidance to project teams on the tools and practices. In Team Support project teams are supported in the implementation of the new practices and tools to help embed new ways of working in company practice. Project Monitoring establishes the impact of the new practices on project performance to demonstrate that they are working and thus reinforce change. To establish the training initiative's effectiveness and key findings, the impact of the initiative on design management performance has been explored. The research has established which practices and tools were used, which were not, as well as an understanding the applicability and performance of each Handbook practice and tool. From this, barriers to implementing new design management tools in industry were identified and strategies developed in order to overcome such barriers.
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Imam, Neena. "Analysis, design, and testing of semiconductor intersubband devices." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15664.
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Deo, Nitin. "Completion and validation of the design of a reconfigurable image processing board." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/53064.
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Starting in September 1984, the Telesign project is an extensive and complex project proposed and undertaken by Dr. Nadler at Virginia Tech. The emphasis of this project is to enable the members of the deaf community to communicate visually using sign language or lip reading over the telephone network.
The Image Processing Board (IPB) is the 'Brain' of the whole system. The IPB processes a given frame of an image to transmit only selected data. It uses the pseudo-laplacian operator, invented by Dr. Nadler, for edge detection. According to a recent survey of various edge detection algorithms by D. E. Pearson, [1], the pseudo-laplacian operator is the most efficient one and it produces the most natural pictures.
The whole IPB hosts about one hundred LSI/VLSI chips according to the present hardware description. In the case of such a big system, hardware simulation becomes mandatory in order to ensure reliability of the design and to anticipate any kind of logic or timing errors in the design. This thesis describes the modifications to the original design to make it reconfigurable with proper initialization and the Hardware Simulation of the IPB, using General Simulation Program (GSP), including some comments on the simulators available at Virginia Tech and in particular a critique of the simulator used here. Many improvements to the simulator are suggested. Precautions to be taken while preparing the lay-out and wiring of the IPB, suggestions to simplify the design at some points at the cost of a few more chips, and lastly the instructions to run the models to get the required results, are outlined in this thesis.Master of Science
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Stewart, Susan White. "Enhanced Finned-Tube Condenser Design and Optimization." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5289.
Full textAbstract:
Enhanced Finned-Tube Condenser Design and Optimization
Susan W. Stewart
173 pages
Directed by Dr. Sam V. Shelton
Finned-tube heat exchangers are widely used in space conditioning systems, as well as any other application requiring heat exchange between liquids and gases. Their most widespread use is in residential air conditioning systems. Residential systems dictate peak demand on the U.S. national grid, which occurs on the hot summer afternoons, and thereby sets the expensive infrastructure requirement of the nations power plant and electrical distribution system. In addition to peak demand, residential air conditioners are major energy users that dominate residential electrical costs and environmental impact.
The only significant opportunity for electrical power use reduction of residential air conditioners is in technology improvement of the finned-tube heat exchangers, i.e., condenser and evaporator coils. With the oncoming redesign of these systems in the next five years to comply with the regulatory elimination of R-22 used in residential air conditioners today, improvement in the design technology of these systems is timely.
An air conditioner condenser finned-tube coil design optimization methodology is derived and shown to lead to improved residential air conditioner efficiency at fixed equipment cost. This nonlinear optimization of the 14 required design parameters is impractical by systematic experimental testing and iteration of tens of thousands condenser coils in an air conditioning system. The developed methodology and results can be used in the redesign of residential systems for the new mandated environmentally friendly refrigerants and to meet increasing regulatory minimum system efficiencies.
Additionally, plain fins and augmented fins, (louvered), are compared using the developed model and optimization scheme to show the effect of the augmentation on system performance. Furthermore, an isolated condenser model was developed using condenser entropy generation minimization as the figure of merit to minimize the model complexity and computation time. Isolated model optimizations are compared with the system model optimum designs.
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Huang, Hong. "Hybrid and resilient WDM mesh optical networks." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15751.
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Bettin, Cameron. "A design standards manual for the Wheaton Park District, Wheaton, Illinois." Virtual Press, 1993. http://liblink.bsu.edu/uhtbin/catkey/864947.
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The purpose of the creative project was to complete a Design Standards Manual consisting of guidelines and standards to aid Park Planners in completing the site design process (the site design plan and construction drawings). The project consists of chapters pertaining to playground, outdoor athletic facility, parking lot and park road, plant material, trails-paths, and signage design.The project was tested through a case study involving Ball State University landscape architect students redeveloping twelve school sites for the City of Anderson School Corporation. The test was to determine if an organized, technical manual would ease decision making in the site design process, make plans consistantly workable, and not limit the Planners originality and creativity. The case study was summarized, evaluated, and the project's usefulness and limitations were concluded.Department of Landscape Architecture
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Subbiah, Arun. "Design and evaluation of a distributed diagnosis algorithm for arbitrary network topologies in dynamic fault environments." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/13273.
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Mony, Madeleine. "Reprogrammable optical phase array." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103276.
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The evolving needs of network carriers are changing the design of optical networks. In order to reduce cost, latency, and power consumption, electrical switches are being replaced with optical switching fabrics at the core of the networks. An example of such a network is an Agile All-Photonic Network (AAPN).This thesis presents a novel device that was designed to operate as an optical switch within the context of an AAPN network. The device is a Reprogrammable Optical Phase Array (ROPA), and the design consists of applying multiple electric fields of different magnitudes across an electro-optic material in order to create a diffractive optical element. The configuration of the electric fields can change to modify the properties of the diffractive device.
Such a device has a wide range of potential applications, and two different ROPA designs are presented. Both designs are optimized to function as 1xN optical switches. The switches are wavelength tunable and have switching times on the order of microseconds. The ROPA devices consist of two parts: a bulk electro-optic crystal, and a high-voltage CMOS chip for the electrical control of the device. The design, simulation, fabrication and testing of both the electrical and optical components of the devices are presented.
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Newman, Michael John 1976. "Design and control of a Universal Custom Power Conditioner (UCPC)." Monash University, Dept. of Electrical and Computer Systems Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/5651.
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Grenell, James F. "Spectral attenuation and wearability of circumaural hearing protectors as influenced by design attributes and work-related activity." Thesis, This resource online, 1988. http://scholar.lib.vt.edu/theses/available/etd-04272010-020352/.
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Tan, Junyi, and 譚軍毅. "Investigation of novel liquid desiccant cooling system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42664251.
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Zaerr, Jon Benjamin 1963. "Development and evaluation of a dynamic phantom using four independently perfused in vitro kidneys as a tool for investigating hyperthermia systems." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/291341.
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A dynamic phantom for use in investigating hyperthermia heating systems has been designed, constructed, and tested. A computer controlled the flow rate of 80% Ethanol to each of 4 preserved in vitro canine kidneys which acted as the phantom material. The flow rates were regulated with stepper motor controlled valves and measured with flow meters by the computer. This provided a flexible system for adjusting the perfusion as desired. The system was tested with step and ramp changes in perfusion under constant power ultrasound and with a temperature controlled perfusion algorithm, all of which yielded repeatable results. The dynamic phantom developed in this work shows potential for expediting investigations of hyperthermia controllers, temporal blood flow patterns, and inverse problems. Its computer based nature gives it great flexibility which would lend itself well to automated testing procedures.
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Subramaniam, Vishwanath. "Design of Air-cooled Microchannel Condensers for Mal-distributed Air Flow Conditions." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5088.
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Air-cooled condensers are routinely designed for a variety of applications, including residential air-conditioning systems. Recent attempts at improving the performance of these heat exchangers have included the consideration of microchannel tube, multilouver fin heat exchangers instead of the more conventional round tube-plate fin designs. In most packaged air-conditioning systems, however, the condenser surrounds the compressor and other auxiliary parts in an outdoor unit, with an induced draft fan at the top of this enclosure. Such a configuration results in significant mal-distribution of the air flow arriving at the condenser, and leads to a decrease in performance. This work addresses the issue of mal-distribution by adapting the air-side geometry to the expected air flow distribution. A microchannel tube, multilouver fin condenser is first designed to transfer the desired heat rejection load for an air-conditioning system under uniform air flow conditions. Tube-side pass arrangements, tube dimensions, and fin and louver geometry are varied to arrive at a minimum mass, 2.54 kg condenser that delivers the desired heat load of 14.5 kW. The design model is then used to predict the performance of the condenser for a variety of air flow distributions across the heat exchanger. It is found that for a 50% air flow mal-distribution, the required condenser mass increases to 2.73 kg. The air-side geometry (fin density and height) of the condenser is then systematically changed to optimally distribute the air-side surface area across the condenser to best address the mal-distributed air flow. It is found that linear fin density and height variations from the mean value of 40% and 20%, respectively, keeping the mean fin density and height the same, reduce the required condenser mass to 2.65 kg even for this mal-distributed air-flow case. The influence of geometry variations on heat transfer coefficients, fan power and other performance measures is discussed in detail to guide the judicious choice of surface area and tube-side flow area allocations for any potential air flow mal-distribution. The results from this study can be used for the design of air-cooled condensers under realistic flow conditions.
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Fitzgerald, Nicholas B. "The Small Volume Autonomous Water Sampler (SVAWS): An Innovative, Cost- Effective, Adaptable Protocol." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/1533.
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As of 2007, U.S. pesticide use stood at 1.1 billion pounds with 80% of all usage in agriculture. Such realities pose a potentially dangerous threat to our surface water bodies. This research provides a detailed analysis of the design, operation and field testing of a prototype water sampler, the Small Volume Autonomous Water Sampler (SVAWS). The research includes a discussion of the design and construction of the SVAWS. Seven USGS employees operated the SVAWS in a number of different states and conditions in order to collect samples for pesticide analysis. Field-testing outcomes of the SVAWS were measured through a Participant Survey Request and a Likert-Scale Assessment.
Overall, survey data proved the SVAWS to be an effective device for collecting water samples in different locations and conditions. Users also understood the SVAWS has significant potential for applications other than pesticide studies. While feedback did show a number of alterations or modifications could improve the design, the device proved to be effective across many of its goals, from valid water sampling to reducing costs of sample acquisition. Recommendations for future research include these and other avenues of research. A conclusion addresses the potential future of the SVAWS with respect to water sampling applications.
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Peterson, Zachariah Marcus. "Physical and Electrical Characterization of Triethanolamine Based Sensors for NO₂ Detection and the Influence of Humidity on Sensing Response." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/418.
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Triethanolamine (TEA) is a semiconducting polymer which exhibits a resistance change when exposed to various gases. The polymer also exhibits a number of reactions with nitrogen dioxide, with the reaction products being heavily dependent on the presence or absence of water vapor. Previous studies have attempted the incorporation of a TEA-carbon nanoparticle composite as the active sensing layer in a chemresistive sensor for detection of NO₂. The incorporation of carbon nanoparticles in the polymer nanocomposite was thought to amplify the sensor's response. There are a number of chemical reactions that can occur between TEA and NO₂, with the reaction products being heavily dependent on the presence and amount of water vapor in the environment. Because of this influence, it becomes necessary to know to what degree the presence of water vapor interferes with the sensing response. In this work we show that the sensor exhibits a reversible resistance change as background humidity changes. This sensitivity to humidity changes is so large that it renders undetectable any resistance change that could be caused by the reaction of TEA with NO₂. Furthermore, we show that the presence of low levels of NO₂ do not interfere with adsorption of water vapor. The detection mechanism is based on measuring resistance changes in the TEA film due to the adsorption/desorption of water vapor. The sensing response can be described by Langmuir adsorption by using a site-based model for the polymer film resistance. Breakdown of the polymer film over time due to continuous adsorption of water vapor, as well as photodegradation of the polymer film, will be discussed. SEM images will also be presented showing growth of crystallites on the electrode walls, as well as experimental results demonstrating degradation of the sensing film during sensor operation.
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Chang, Jae Joon. "CMOS differential analog optical receivers with hybrid integrated I-MSM detector." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/14998.
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Therdthai, Nantawan. "Modelling and optimisation of an industrial bread baking oven /." View thesis, 2003. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20040428.131506/index.html.
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Thesis (PhD) -- University of Western Sydney, 2003.A thesis submitted to the University of Western Sydney in partial fulfillment of the requirements for the degree of Doctor of Philosophy. Includes references pp.191 - 202, and appendices.
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Xing, Chengwen, and 邢成文. "Linear minimum mean-square-error transceiver design for amplify-and-forward multiple antenna relaying systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44769738.
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Mach, Phillip M. "Design Considerations and Implementation of Portable Mass Spectrometers for Environmental Applications." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984177/.
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Portable mass spectrometers provide a unique opportunity to obtain in situ measurements. This minimizes need for sample collection or in laboratory analysis. Membrane Inlet Mass Spectrometry (MIMS) utilizing a semi permeable membrane for selective rapid introduction for analysis. Polydimethylsiloxane membranes have been proven to be robust in selecting for aromatic chemistries. Advances in front end design have allowed for increased sensitivity, rapid sample analysis, and on line measurements. Applications of the membrane inlet technique have been applied to environmental detection of clandestine drug chemistries and pollutants. Emplacement of a mass spectrometer unit in a vehicle has allowed for large areas to be mapped, obtaining a rapid snapshot of the various concentrations and types of environmental pollutants present. Further refinements and miniaturization have allowed for a backpackable system for analysis in remote harsh environments. Inclusion of atmospheric dispersion modeling has yielded an analytical method of approximating upwind source locations, which has law enforcement, military, and environmental applications. The atmospheric dispersion theories have further been applied to an earth based separation, whereby chemical properties are used to approximate atmospheric mobility, and chemistries are further identified has a portable mass spectrometer is traversed closer to a point source.
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Brinkman, Karen L. "Design of a microcomputer-based open heart surgery patient monitor." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/76031.
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A patient monitor device for use during open heart surgery has been designed and constructed. The device uses a VIC 20 microcomputer along with some additional circuitry to monitor 3 separate functions. The first patient variable monitored is the blood flow rate through the extracorporeal blood circuit during surgery. The device also continuously monitors and displays 6 separate temperatures. Finally, 3 individual timers are monitored and displayed with the device. Both the hardware and the software used in the design are fully described.Master of Science
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Dody, Joseph W. "Study of biomass combustion characteristics for the development of a catalytic combustor/gasifier." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/43039.
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The research reported here explored, a "new" approach to biomass
energy conversion for small-scale process heat-applications. The conversion process uses close-coupled catalytic. combustion to burn combustibles in effluent generated by primary combustion or gasification of biomass fuels. Computer control of primary and secondary air flow rates allow control of the devices output power while maintaining fuel-lean or stoichiometric conditions in the effluent entering the catalytic combustion zone. The intent of the secondary combustion system is to ensure "clean" exhaust (i.e., promote complete combustion).
A small-scale combustor/gasifier was built and instrumented.
Characteristics of combustion were studied for three biomass fuels so
that primary and secondary air flow control strategies could be devised. A bang-bang type controller was devised for primary air flow
control. Secondary air as controlled based on feedback signals from an inexpensive automobile exhaust gas oxygen sensor. The control strategies and catalytic combustion were implemented on prototype combustor/gasifier and the device was tested with good results.
Power turn down ratios of 4 to 1 and 3 to 1 were achieved. The
zitconia-type automobile exhaust gas oxygen sensors adapted well to the combustion environment of biomass fuel, at least for short periods (long term durability tests were not conducted). The secondary air control system was able to maintain fuel-lean flows for the most part and, the secondary combustion system provided reductions of approximately three fourths in carbon monoxide emissions.Master of Science
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Hillig, Mark Alexander. "Automated Channel Assessment for Single Chip MedRadio Transceivers." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1005.
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Modern implantable and body worn medical devices leverage wireless telemetry to improve patient experience and expand therapeutic options. Wireless medical devices are subject to a unique set of regulations in which monitoring of the available frequency spectrum is a requirement. To this end, implants use software protocols to assess the in-band activity to determine which channel should be used. These software protocols take valuable processing time and possibly degrade the operational lifetime of the battery. Implantable medical devices often take advantage of a single chip transceiver as the physical layer for wireless communications. Embedding the channel assessment task in the transceiver hardware would free the limited resources of the microprocessor. This thesis proposes hardware modifications to existing transceiver architectures which would provide an automated channel assessment means for implantable medical devices. The results are applicable beyond medical device applications and could be employed to benefit any low-power, wireless, battery-operated equipment.
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Pietersen, Richard Gordon. "Thermoelectric cooling for microwave transmitters located at remote sites." Thesis, Cape Technikon, 1992. http://hdl.handle.net/20.500.11838/2158.
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Thesis (MDiploma (Mechanical Engineering))--Cape Technikon, 1992.An investigation into the use of thermoelectric cooling energised by photovoltaic (PV) panels for removing sensible heat from electronic telecommunications equipment. The thermoelectric cooler consists of a solid-state heat pump which operates on the principle of the Peltier effect. The thermoelectric device transfers heat through a cold sink to ambient outside air via a hot sink. A major prerequisite was that the system should be selfsufficient in terms of power because the sites for the microwave transmitters are often remote. Solar power was the only alternative source of energy and the cooler was designed to accept direct current from PV panels which are usually used to power transmitters on distant locations. The cooling device had to be reliable, virtually maintenance-free and simple to repair.
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Gurganus, Heath Alan. "Battery Energy Storage Systems to Mitigate the Variability of Photovoltaic Power Generation." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1495.
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Methods of generating renewable energy such as through solar photovoltaic (PV) cells and wind turbines offer great promise in terms of a reduced carbon footprint and overall impact on the environment. However, these methods also share the attribute of being highly stochastic, meaning they are variable in such a way that is difficult to forecast with sufficient accuracy. While solar power currently constitutes a small amount of generating potential in most regions, the cost of photovoltaics continues to decline and a trend has emerged to build larger PV plants than was once feasible. This has brought the matter of increased variability to the forefront of research in the industry. Energy storage has been proposed as a means of mitigating this increased variability -- and thus reducing the need to utilize traditional spinning reserves -- as well as offering auxiliary grid services such as peak-shifting and frequency control. This thesis addresses the feasibility of using electrochemical storage methods (i.e. batteries) to decrease the ramp rates of PV power plants. By building a simulation of a grid-connected PV array and a typical Battery Energy Storage System (BESS) in the NetLogo simulation environment, I have created a parameterized tool that can be tailored to describe almost any potential PV setup. This thesis describes the design and function of this model, and makes a case for the accuracy of its measurements by comparing its simulated output to that of well-documented real world sites. Finally, a set of recommendations for the design and operational parameters of such a system are then put forth based on the results of several experiments performed using this model.