Tesis sobre el tema "Asymmetric profiles"
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Ilie, Katherine-Rodica y Katherine ilie@rmit edu au. "Modelling, Simulation and Optimisation of Asymmetric Rotor Profiles in Twin-screw Superchargers". RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080213.144857.
Texto completoIgnace, Richard. "Asymmetric Shapes of Radio Recombination Lines from Ionized Stellar Winds". Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etsu-works/5502.
Texto completoPrause, Nils [Verfasser] y Dieter [Akademischer Betreuer] Reimers. "The influence of asymmetric line profiles on the reliability of the search for varying fundamental constants / Nils Prause. Betreuer: Dieter Reimers". Hamburg : Staats- und Universitätsbibliothek Hamburg, 2014. http://d-nb.info/1059237946/34.
Texto completoSanders, Aaron Anthony. "An Experimental Investigation of the Influence of Elliptical Root Shapes and Asymmetric Teeth on Root Stresses and Bending Fatigue Lives". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1290530501.
Texto completoDE, MARTIN ANDREA. "Development of a novel gerotor pump for lubrication systems of aeronautic engines". Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2698519.
Texto completoBorgström, Veronika. "Mapping asymmetries of the H-alpha line profile in solar flares". Thesis, Stockholms universitet, Institutionen för astronomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-169334.
Texto completoLarkin, Janet Dawne. "Kinematic profiles of the hands in a bimanual task: a study in movement asymmetry /". Access Digital Full Text version, 1985. http://pocketknowledge.tc.columbia.edu/home.php/bybib/10992509.
Texto completoTypescript; issued also on microfilm. Sponsor: J. R. Higgins. Dissertation Committee: A. M. Gentile. Includes bibliographical references: (leaves 48-52).
Nurgaliev, Daniyar Rashidovich. "A Study of the Radial and Azimuthal Gas Distribution in Massive Galaxy Clusters". Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11514.
Texto completoPhysics
Albuloushi, Nour M. S. M. J. "Governance configurations: Testing the global value chain framework". Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/116771/2/Nour%20M%20S%20M%20J_Albuloushi_Thesis.pdf.
Texto completoCoetzee, Gert Louis. "Investigating the bottom free surface nappe (Ogee profile) across a sharp-crested weir influenced by the flow in an asymmetrical approach channel". Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/37353.
Texto completoLI, Songyu. "A New Hands-free Face to Face Video Communication Method : Profile based frontal face video reconstruction". Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-152457.
Texto completoHaffner, Yann. "Manipulation of Three-Dimensional Turbulent Wakes for Aerodynamic Drag Reduction Mechanics of bluff body drag reduction during trnasient near wake reversals Unsteady Coanda Effect and Drag Reduction of a Turbulent Wake Manipulation of Three-Dimensional Asymmetries of a Turbulent Wake for Drag Reduction Large-Scale Asymmetries of a Turbulent Wake: Insights and Closed-Loop Control for Drag Reduction". Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0006.
Texto completoCombination of passive and active flow control are used to experimentally reduce the aerodynamic drag produced by the turbulent wake past a simplified vehicle geometry with a blunt base. Such wakes are characterized by two main features: important pressure drag linked to the massive flow separation, and large-scale asymmetries. The latter,manifesting as bi-modal dynamics or permanent symmetry-breaking, are shown to contribute for around 10% of the pressure drag. The study of the transient wake reversais occurring in bi-modal dynamics though symmetric states enables to isolate the flow mechanism responsible for increased drag in symmetry-breaking states. An interaction and coupling between the recirculating flow from one side and the shear-layer from opposite side peculiar to symmetry-breaking states triggers shear-layer instabilities and their amplification leading to increased flow entrainment and drag.This mechanism is shown to be characteristic of the wakes of blunt bodies.An active flow control strategy combining tangential pulsed jets along the trailing-edges and small flush-mounted curved surfaces is used to reduce the pressure drag of the geometry. The flow reattachment and separation on thecurved surfaces results in a fluidic boat-tailing of the wake leading to drag reductions up to 12%, independently of the unforced large-scale asymmetry of the wake, and is noticeably influenced by the time-scale of unsteadiness of the forcing. Careful combination between forcing time-scale and size of the curved surfaces is needed to achieve ail thepotential of this unsteady Coanda effect in drag reduction as shown from a simple flow model providing scaling laws of the phenomenon. The model provided allows for an extension of the flow control mechanism to separated flows moregenerally. Furthermore, forcing along only selected edges enables to interact with the large-scale wake asymmetries and has very different impact on the drag depending on the unforced wake equilibrium. Symmetrisation of the wake through asymmetric forcing leads to 7% drag reduction at a reduced energetic cost. Key ingredients are provided to adapt forcing strategies for drag reduction in presence of various wake asymmetries. As global wake equilibrium changes result from minor geometric and flow conditions changes, adaptive and robust flow control strategies are essential for industrial automotive applications
Lin, Yu-Min y 林育民. "The Study on the Gain Profiles of Asymmetric Multiple Quantum Well Semiconductor Lasers". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/30003926531916855337.
Texto completo國立彰化師範大學
電子工程學系
96
AlGaInAs material was used to design 1.31μm semiconductor laser diodes by applying asymmetric quantum wells. Commercial softwares APSYS and LASTIP was used to simulate the effect of quantum well thickness,composition,and arrangement on the gain profile of the laser. The effects of cavity length and mirror reflectance on the flatness of the gain profile were also studied. The simulation results indicated that the width of the gain profile can be manipulated by changing the width and number of the quantum wells while the flatness and intensity of the gain profile can be adjusted by changing the arrangement of quantum wells. Optical confinement factor played an important role by enhancing electrical and optical coupling. The gain corresponding to quantum wells with higher confinement factor will be enhanced. The threshold gain was increased when the cavity length was decreased. The threshold carrier density increased due to larger mirror loss. The gain profike corresponding to narrow quantum wells was enhanced due to higher injection and higher differential gain. Changing cavity length had similar effect.
Lin, Geng-Ching y 林庚慶. "Stress Analysis of the ZK-Type Worm Gear Set Generated by Oversize Hob Cutters with Asymmetric Tooth Profiles". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/58417287927865975840.
Texto completo明新科技大學
精密機電工程研究所
97
The worm gear set is one of the cross axes transmission mechanisms. Worm gear set can conquer the tooth undercutting problem, which occurs due to the small number of teeth of conventional gear sets with some special modules. Therefore, worm gear set can provide high gear ratios that spur and helical gear set could not offer. Besides, the worm gear set has a larger contact ratio which enables its loading capability. In this research, mathematical model of a worm gear set is developed based on the theory of gearing and the technique of computer aided design. The worm is generated by an asymmetrical grinding wheel. The mathematical model of the asymmetric ZK-type worm surfaces can be obtained by simulation of the generation mechanism of the grinding wheel and worm. With the design of an oversize worm type hob cutter, the mathematical model of the worm gear surfaces can be obtained according to the oversize hob cutter and worm gear hobbing mechanism. The equation of meshing between the oversize hob cutter and the produced worm gear surfaces is also studied. Based on the developed mathematical models of the worm and worm gear, the finite element stress analysis of the worm gear set is performed. Analysis results of the asymmetric ZK-type worm gear set are compared with those of conventional symmetric ZK-type worm gear set. The analysis results are most helpful to the designer and manufacturer of the worm gear set. Key words:Worm and worm gear set, ZK-type, Oversize hob cutter, Asymmetric tooth profile, Stress analysis.
Huang, Shih-Ying y 黃釋瑩. "Study on Asymmetric Tooth Profile Design and Performance of the External Gear Pump". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/00255713288399318186.
Texto completo國立屏東科技大學
機械工程系所
99
Gear pumps have been widely used in the fluid transmission systems nowadays. Generally, an external gear pump has a pair of gears, which are operated in an operation space in the housing. A sealed volume in the housing is reduced by the gears and accordingly fluid is compressed as the gears are engaged with each other and rotated. However, the outflow fluctuation may be induced by such a periodic variation of the sealed volume. The flow leakage may also occur because of the clearances between the gears and the housing. Moreover, since the gear design constraints, there will form trapped volumes between the gear surfaces and lead to gear pitting and low flow efficiency. This thesis aims to study the relationship between the asymmetric tooth profile parameters of the pump gears and the pump performance indices. The direct gear design (DGD) method is adopted to design the asymmetric gear tooth profile, wherein the tooth number, the circular pitch thickness, the pressure angle and the contact ratio are directly given and then the other geometric parameters used to depict a fully gear tooth profile can be derived. Compared with the traditional rack generating method, the DGD method can obtain the larger contact ratio and wider design range in gear tooth profile design under the same meshing pressure angle. Further, the contact positions in each engaged stage of a pair of pump gears are analyzed and calculated by transforming the contact length into the calculation of flow rate, outflow fluctuation amplitude and so on to estimate the flow characteristics of the gear pump under different gear tooth parameters. As shown in the numerical results, the coefficient of non-uniform flow rate can be reduced by increasing the tooth number and decreasing the contact ratio or the asymmetric coefficient of gears. Besides, the outflow fluctuation amplitude can be reduced by decreasing the tooth number, contact ratio or asymmetric coefficient of the pump gears. Further, as the tooth number, contact ratio or asymmetric coefficient of the pump gears increase, the average flow rate of the gear pump can be increased.
Cheng, Tan-Hui y 鄭丹卉. "An Empirical Study of Asymmetric Relationships between Risk and Return: Evidence from Analyzing Taiwan Stock Index Futures based on Market Profile". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/k6b8bp.
Texto completo國立交通大學
資訊管理研究所
101
Since Fama defines the efficient market hypothesis, the researchers have published a study of empirical analysis of efficient markets, but because the different kinds of research methods, research data, and the research object, whether the market is efficient or not may also have different conclusions. Based on the theory of market profile, the study intends to analyze the eight-year Taiwan Stock Index Futures data using back-propagation neural network as an assessment tool for the future market direction. The study tries to find free exposure in the futures market, so as to achieve better profit point but low-risk trading position and discuss the relationship between risk and return in Taiwan futures market, then examine the Taiwan futures market meet the weak-form efficient market hypothesis. The research results show that indeed it finds out the relative low-risk trading price in the futures market. The experimental results not only verify the effectiveness of the market profile indicator, but also support the asymmetric relationships between risk and return exists in the Taiwan futures market, so that the Taiwan futures market does not meet the weak-form efficient market hypothesis.
Pan, Jie. "Towards a Precision Measurement of Parity-Violating e-p Elastic Scattering at Low Momentum Transfer". 2012. http://hdl.handle.net/1993/8124.
Texto completoMacedo, Sofia Félix. "Estudo piloto : comparação da avaliação estética facial entre leigos, estudantes e profissionais de medicina dentária". Master's thesis, 2013. http://hdl.handle.net/10400.14/13667.
Texto completoIntroduction: Facial aesthetics is an important factor for orthodontic diagnosis. However, it is difficult to define the goal of treatment only based on aesthetic profile, since there is not one only facial profile credited for the entire world population as aesthetically attractive, because each individual has his own concept of beauty, which is related to several factors. This study aims at obtaining specific and updated data, regarding facial attractiveness of Portuguese caucasians individuals. It is intended to assess the impact of mandibular prominence, facial asymmetry, lip profile and lower facial height, determine the threshold where they become clinically significant and aesthetically relevant to different groups, and the impact of these characteristics by gender and history of orthodontic treatment. Methods: We manipulate the photographs of a male and a female, aesthetically considered normal according to current standards, increasing and decreasing the features under study, with the aim of creating an album with randomly organized photos, which was distributed to 30 dentists, 30 dental students of UCP and 30 laypeople. Each one assessed each photograph in a 100 mm visual analog scale. Results: We found that the facial profile by the sample chosen as the most attractive was the straight profile for both genders, with severe mandibular protrusion, severe lip retrusion, severe lower facial height decreased and severe facial asymmetry were considered less attractive to both genders. It was found that the laypeople are less critical that students and dental professionals. It was also found that there was no significant difference in the influence of the history of orthodontic treatment and gender. Conclusions: The facial aesthetics is a factor that interferes with the patient's self-esteem, with implications at various levels, being of great interest to the dentist compare the evaluation criteria of facial attractiveness, in terms the satisfaction of the ideals of orthodontic treatment