Teses / dissertações sobre o tema "Positive slope"
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Veja os 16 melhores trabalhos (teses / dissertações) para estudos sobre o assunto "Positive slope".
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Alloin, Eliott. "Etude numérique des instabilités hydrodynamiques dans le distributeur et l'avant-distributeur de turbines-pompes". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALI025.
Texto completo da fonteFor improved grid stability and better integration of intermittent renewable energies, Pump Turbines (PT) in Pump Storage Plants (PSP) are used in pump mode further away than their design point. In pump mode, the hump zone limits the operating range at part load (high head). The numerical prediction of the PT performances of this part-load instability is still challenging. In this study, Large Eddy Simulations (LES) are used to improve the prediction of the tandem cascade hump. Simulations on a full PT geometry are done for several operating points. An Arbitrary-Lagrangian-Eulerian (ALE) approach coupled with a Dynamic Mesh Adaptation (DMA) methodology is used to take into account the runner rotation. Moreover, a mesh convergence strategy is used to guarantee the accuracy of the mean field discretization, and to ensure the resolution of a sufficient part of the turbulent scales. Specific attention is paid to properly comparing simulations to experimental tests. Simulations results are in good agreement with experimental results obtained with platform tests made by General Electric Hydro Solutions. Part-load simulations predict (rotating or alternate) stalls in the tandem cascade. Moreover, it is shown that those stalls influence the flow in the runner where vortices, close to the trailing edges of the blades, are generated. This phenomenon generates losses and is responsible for the positive slope in the pump characteristic curve leading to unstable pump behavior. Scale Adaptative Simulations (SAS) are also used on the full PT geometry. The latter predict the same losses as LES except in the runner where they fail to predict the trailing edge vortices. Other LES simulations, on a simplified configuration, highlight parameters influencing tandem-cascade stalls. This study allows a new insight into part-load instability
Monika, Sadia K. "III- Nitride Enhancement Mode Device". The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1483535296785214.
Texto completo da fonteWang, Jinou [Verfasser]. "The Current Slope Based Position Estimation for Self-Sensing Magnetic Bearings / Jinou Wang". Aachen : Shaker, 2016. http://d-nb.info/1101184736/34.
Texto completo da fonteMcCombs, John Wayland II. "Geographic Information System Topographic Factor Maps for Wildlife Management". Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36865.
Texto completo da fonteMaster of Science
Enger, Matthew. "IMPACTS OF CONCENTRATED FLOW PATHS ON CROP YIELDS AND WATER QUALITY IN SOUTHERN ILLINOIS ROW CROP AGRICULTURE". OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2380.
Texto completo da fonteSandy, Alexis Emily. "Environmental and Digital Data Analysis of the National Wetlands Inventory (NWI) Landscape Position Classification System". Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/33572.
Texto completo da fonteMaster of Science
Brett, Bob, Karel Klinka, H. Qian e Christine Chourmouzis. "Classification of high-elevation, non-forested plant communities in coastal British Columbia. Full report". Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/719.
Texto completo da fonteKlinka, Karel, Christine Chourmouzis, Bob Brett e H. Qian. "Classification of high-elevation, non-forested plant communities in coastal British Columbia". Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/710.
Texto completo da fonteAlves, Ronaldo Fernandes Santos. "Desigualdade socioeconômica e obesidade abdominal: uma apreciação crítica e pragmática em epidemiologia". Universidade do Estado do Rio de Janeiro, 2014. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8505.
Texto completo da fonteFundação de Amparo à Pesquisa do Estado do Rio de Janeiro
Esta dissertação buscou uma apreciação crítica e pragmática da relação entre desigualdade socioeconômica e obesidade abdominal, em resposta a proposição internacional de monitoramento das desigualdades em saúde e a escassez de estudos desta natureza relativos à obesidade abdominal. Dois artigos foram elaborados a fim de estimar o grau de desigualdade educacional na ocorrência de obesidade abdominal e revisar os estudos de associação entre posição socioeconômica e obesidade abdominal. O primeiro artigo utilizou o índice angular de desigualdade e o índice relativo de desigualdade em dados seccionais de 3.117 participantes da linha de base do Estudo Pró-Saúde, 1999-2001, e o segundo artigo abarcou os resultados de estudos conduzidos em população adulta no Brasil. Os índices de desigualdade resumiram a tendência monotônica e inversa observada entre escolaridade e obesidade abdominal na população feminina, proporcionando estimativas quantitativas desta desigualdade (artigo 1). Em concordância, observou-se que a associação entre indicadores de posição socioeconômica e obesidade abdominal foi majoritariamente inversa entre as mulheres, principalmente com relação à escolaridade, e estatisticamente não significativa entre os homens (artigo 2). Tal cenário epidemiológico evidencia que a obesidade abdominal tem afetado desproporcionalmente as mulheres de posição socioeconômica mais baixa e que a desigualdade de gênero na prevalência de obesidade abdominal tende a aumentar com menor posição socioeconômica. Em suma, a presente dissertação visou à produção de conhecimento epidemiológico relevante ao enfrentamento das desigualdades em saúde, com o objetivo premente de subsidiar políticas públicas de fato realizáveis e individualmente aceitáveis.
This dissertation sought to a critical and pragmatic assessment of the relationship between socioeconomic inequality and abdominal obesity in response to international proposition of health inequalities monitoring and to lack of studies of this nature relating to abdominal obesity. Two articles were prepared to -estimate the level of educational inequality in the occurrence of abdominal obesity, and review the association studies between socioeconomic position and abdominal obesity. The first article used the slope index of inequality and the relative index of inequality in the sectional data of 3.117 participants in the baseline of the Pró-Saúde Study, 1999-2001; and the second article encompassed the results of the studies conducted in the adult population in Brazil. The inequality indexes summarized strictly monotonic and inverse trend between educational achievement and abdominal obesity in the female population, providing quantitative estimates of this inequality (Article 1). Accordingly, we found that the association between socioeconomic position indicators and abdominal obesity was mostly reversed among women, especially regarding education, and statistically not significant among men (Article 2). This epidemiological scenario shows that abdominal obesity has disproportionately affected women of the lower socioeconomic position, and gender inequality in the prevalence of abdominal obesity tends to increase with lower socioeconomic position. In short, this dissertation aimed at the production of relevant epidemiological knowledge to addressing health inequalities, with the targeted of subsidize public policies feasible and individually acceptable.
Van, Noord Kenrick A. A. "Deep-marine sedimentation and volcanism in the Silverwood Group, New England Fold Belt, Australia". Thesis, Queensland University of Technology, 1999.
Encontre o texto completo da fonteHuang, Yu-Shan, e 黃鈺珊. "Influence of Loading Position to the Colluvial Slope Displacement". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/47217334390987563648.
Texto completo da fonte華梵大學
環境與防災設計學系碩士班
97
This study investigates the influence of loading position on slope displacements of colluviums through the tests by large-scale earth model and numerical simulation. In the tests of large-scale earth model, 30∘slopes of colluviums are constructed with the dimensions of 120cm in width and 80cm in height by static compression, then the loading plate is applied on the top of slope with the distances of 5cm, 10cm, 15cm, respectively, away from the edge of slope. From the results obtained in this study, it is found that the range of potential slip surface varies with respect to the distance of loading position. And the maximum normal displacement of slope increases with a longer elapsed time if the distance between loading plate and the edge of slope increase. It is also observed through the reading of dial gauges that the maximum displacements appears between one third and half of slope measured from tip of slope. The potential slip surfaces of the slopes tested are also simulated by STABL that are closed to the slip surface obtained by large-scale earth model with the factor of safe around 1.5. And the displacements measured by the simulation of DDA program are nearly the same as measured in the tests of large-scale earth model.
Lin, Tz-Jie, e 林子傑. "Positive Surge of Density Current due to Variant Slopes of the Dam". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/41620497264867836221.
Texto completo da fonteLIN, Chi-Li, e 林繼立. "The Influence of the Slpoe Stability with Crack Position". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/94nejg.
Texto completo da fonte中原大學
土木工程研究所
93
When the soil with cracks in unsaturated slopes affected by rainfall, except that some rainfall becomes the surface runoff, other rainwater will be permeated with the crack under the surface. Because water infiltration besides making the water table rise, also increase the soil-water pressure, increase the glide stress of the soil, and decrease the anti-shear strength of soil, make slope becomes failure and deformation, even make it failure by slip. Generally the analyzed of slope steadily often neglects the influence of the crack, rainfall infiltration. We always let the soil body physical property as definite value in order to analyze its stability, and not considered that the change of crack, water content will influence the anti-shear strength of soil on time’s changing. So we can’t actually know when the collapse will happen by our slope stability analysis, so the analysis of slope depending yet not enough complete at present. This research will combine the method of rainfall, infiltration and slope stability analysis, and consider the slope crack in different position , applies FEMWATER software in simulating the soil moisture content after a rainfall depending on time’s changing, and the increase and decrease of groundwater. Next, there are different soil parameters in different moisture content. Then, it applies the mode of STEDWIN software to count each stage the relations between safety factors of slope and time. After the simulation test , we know that slope factor of safety will change which depends on the position of ceack. The failure will more easy happen when the slope crack in depth position or approaching the slope top, and the behavior of slope failure also will change with crack depth.
Cheng-Da, Wu, e 吳政達. "A Study on the Effects of the Bed Slope on the Length of position of Debris Flow". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/44834326027898018138.
Texto completo da fonteTsai, Chung-Yuan, e 蔡忠原. "A Position Sensorless Permanent-Magnet Synchronous Motor Drive Based on Current-Slope and Back-EMF Hybrid Approach". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/wgenxm.
Texto completo da fonte國立臺灣科技大學
電機工程系
107
This thesis proposes a hybrid approach to estimate the rotor position for a sensorless IPMSM close-loop speed control system. To achieve a wide adjustable speed range, two different sensorless methods are used. At the standstill and low speed, the current-slope measuring method of the zero voltage vector is used to estimate the rotor position. As a result, the IPMSM starts from standstill smoothly. At the middle and high speed, the extend back-EMF method is used to estimate the rotor position. The proposed method can operate the IPMSM drive system at different speeds from 0 r/min to 3000 r/min with good responses. To improve the dynamic responses of the proposed drive system, a predictive speed-loop controller is proposed to achieve fast transient responses, good load disturbance responses, and good tracking responses. In addition, to avoid the saturation of the input current, this paper also discusses the limitation of current input into the performance index to improve the poor response due to the controller’s constraints. A digital signal processor, TMS320F28379D with delta-sigma A/D converters are used as a control center to execute the rotor position/speed estimation algorithm and the control algorithm. Experimental results can validate the theoretical analysis to show the correctness and feasibility of this proposed method in the thesis.
(8300103), Shams R. Rahmani. "Digital Soil Mapping of the Purdue Agronomy Center for Research and Education". Thesis, 2020.
Encontre o texto completo da fonte