搜索结果: 1-13 共查到“工学 Fluctuations”相关记录13条 . 查询时间(0.125 秒)
AN ORIGINAL PROCESSING METHOD OF SATELLITE ALTIMETRY FOR ESTIMATING WATER LEVELS AND VOLUME FLUCTUATIONS IN A SERIES OF SMALL LAKES OF THE PANTANAL WETLAND COMPLEX IN BRAZIL
Satellite altimetry Envisat Saral Waveform Retracker Water level Small lakes Pantanal
2016/11/30
Satellite altimetry is becoming a major tool for measuring water levels in rivers and lakes offering accuracies compatible with many hydrological applications, especially in uninhabited regions of dif...
EVALUATION AND ANALYSIS OF URMIA LAKE WATER LEVEL FLUCTUATIONS BETTWEN 1998-2006 USING LANDSAT IMAGES AND TOPEX ALTIMETRY DATA
Urmia Lake water volume fluctuation lake shrinkage critical points lake area Salient times
2016/1/15
The Lake Urmiah has undergone a drastic shrinkage in size over the past few decades. The initial intention of this paper is to present an approach for determining the so called “salient times” during ...
Water Pollution by Surfactants: Fluctuations Due to Tourism Exploitation in a Lagoon Ecosystem
MBAS Thyrrenian Sea Orbetello Lagoon Pollution Turism Exploitation
2013/3/11
This paper describes recent levels of surfactants measured in a coastal lagoon ecosystem highly stressed by human activites: the Orbetello lagoon (Southern Tuscany, Italy, Ramsar Site IT008). Signific...
Simulated bilayer from floppy to hole and topological fluctuations
Simulated bilayer hole topological fluctuations
2012/2/27
Simulations of a bilayer in a liquid solvent in the full range of areas from the floppy to the extended state also show the hole/tunnel spontaneous formation. Whether this change of topology is preced...
Dynamics of Energy Fluctuations in Equilibrating and Driven-Dissipative Systems
Dynamics Energy Fluctuations Equilibrating Driven-Dissipative Systems
2012/2/27
When two isolated system are brought in contact, they relax to equilibrium via energy exchange. In another setting, when one of the systems is driven and the other is large, the first system reaches a...
The principle of absence of arbitrage opportunities allows obtaining the distribution of stock price fluctuations by maximizing its information entropy. This leads to a physical description of the und...
阶梯隔舌对离心泵压力脉动和径向力影响的数值模拟（Numerical Simulation on Pressure Fluctuations and Radial Hydraulic Forces in Centrifugal Pump with Step-tongue）
离心泵 阶梯隔舌 动静干涉 径向力
2010/12/29
通过改变隔舌形状，采用SST模型分别对常规隔舌和阶梯隔舌蜗壳的离心泵进行全流道非稳态数值模拟。通过模拟分别获得了常规隔舌和阶梯隔舌蜗壳的离心泵压力脉动特性、作用在蜗壳和叶轮上的径向力特性，并对其进行比较分析。结果表明：采用常规隔舌和阶梯隔舌时，离心泵进出口压力、作用在蜗壳和叶轮上的径向力均随时间呈周期波动，脉动频率均以叶片通过频率为主；采用阶梯隔舌蜗壳后，进出口压力大小值和脉动幅值均明显减弱，高频...
离心泵压力脉动特性分析（Numerical Investigation of Unsteady Pressure Fluctuations in Centrifugal Pump）
离心泵 数值模拟 压力脉动
2010/12/28
为了研究压力脉动在离心泵不同位置的变化规律及其关系，利用CFD技术对离心泵内部流场进行多工况定常与非定常三维数值模拟，得到内部流场特性及计算点的压力脉动情况，并对其进行频域分析。结果表明，设计工况和大流量工况下，叶频是主要影响频率，而在小流量工况下，轴频是主要影响频率；压力脉动幅值随偏离工况的情况而变化，同一流量下，流道的进出口压力脉动变化大。
Seasonal fluctuations and temperature dependence in photosynthetic parameters and stomatal conductance at the leaf scale of Populus euphraticaOliv
Bayesian statistics Farquhar et al. model maximum electron transport rate (J max) maximum rate of Rubisco carboxylation (Vcmax ) photosynthesis stomatal conductance transpiration Populus euphraticaOliv.
2013/9/2
A combined model to simulate CO2and H2O gas exchange at the leaf scale was parameterized using data obtained from in situ leaf-scale observations of diurnal and seasonal changes in CO2and H2O gas exch...
The pressure fluctuations in a fluidised bed are a result of the actions of the bubbles. However, the bubbles may be influenced by the air supply system and by the pressure drop of the air distributor...
车用发动机停缸模式下转速波动仿真（Modeling of Speed Fluctuations for Automotive Engine under Cylinder Deactivation Mode）
车用发动机 停缸 转速波动
2010/2/26
停缸技术可明显改善车用发动机的燃油经济性，但对其动力输出产生影响。通过建立发动机曲柄连杆多体模型，基于示功图和经验公式，分析了模型边界计算方法，仿真了发动机多种停缸模式的转速波动特性。结果表明，停缸工作模式的转速波动主要受发火间隔角的影响，减小工作缸负荷可降低转速波动。 Cylinder deactivation for automotive engine, to decrease the fue...
Examination of air density fluctuations with the aid of laser beam
turbulence density fluctuations
2011/5/4
The paper presents theoretical foundations and results of experimental verification of the possibility of laser beam application for registration of air density fluctuations caused either by mechanica...
How increasing transparency and cooperation in the tropical hardwood plywood trade could reduce market fluctuations and price volatility and reinvigorate the trade
transparency and cooperation tropical hardwood plywood trade market fluctuations price volatility reinvigorate the trade
2014/3/6
This report identifies measures to bring increased transparency to the tropical hardwood plywood trade and analyses the causes of market fluctuations and price volatility.