搜索结果: 61-75 共查到“知识库 热学”相关记录457条 . 查询时间(2.359 秒)
计算曲面壳体等效节点热载荷的新方法
等效节点热载荷 切平面 雅可比行列式 热应力
2018/12/28
提出了一种利用平面壳单元计算曲面壳体热应力问题等效节点热载荷的新方法, 具有较高的计算精度. 首先在平面壳元的理论基础上, 在壳单元切平面建立局部坐标系; 然后根据提出的理论, 利用单元节点整体坐标直接计算壳单元等效节点热载荷积分方程中所需的未知量, 如: 形函数对局部坐标的导数、从对局部坐标积分转换到自然坐标积分时的雅可比行列式等; 最后, 根据提出的算法求出从局部坐标转换到整体坐标的转换矩阵,...
城市热岛效应和气溶胶浓度的动力、热力学分析
城市热岛效应 空气污染物 城市群
2015/4/1
在能量平衡方程中引入气溶胶的吸收和散射作用,并与三维行星边界层运动方程组相耦合,根据温度分布显式求解运动场,探讨三维行星边界层内温度、运动、气溶胶浓度分布特征.结果表明,城市人为热释放直接决定了城市热岛效应的强度,城市面积越大,城市热岛效应的强度也越强,城市面积固定时,城市越分散,城市热岛效应的强度越弱,这为城市建设多采取卫星城的方式提供了一定的理论支撑.气溶胶的散射作用要大于吸收作用,其对城市热...
Observation of thermomechanical equilibration in the presence of a solid 4He conduit
Thermodynamics fluid quartz glass rod temperature difference quantitative thermodynamic effect the superfluid helium
2014/12/19
We observe a thermomechanical effect when a chemical-potential difference is created by a temperature difference imposed between two liquid reservoirs connected to each other through Vycor rods in ser...
Dilute Bose gas with correlated disorder: a path integral Monte Carlo study
Dilute bose gas thermodynamics integral monte carlo method the continuous space superfluids quantum
2014/12/19
We investigate the thermodynamic properties of a dilute Bose gas in a correlated random potential using exact path integral Monte Carlo methods. The study is carried out in continuous space and disord...
The Beliaev technique for a weakly interacting Bose gas
Control precision thermodynamics correlation function interaction bose gas the symmetry
2014/12/18
Aiming at simplicity of explicit equations and, at the same time, controllable accuracy of the theory, we present our results for all the thermodynamic quantities and correlation functions for a weakl...
Type-1.5 superconductivity in two-band systems
Gold landau parameters MathML source separation thermodynamics vortex-induced regime vortex lattice
2014/12/18
In the usual Ginzburg–Landau theory the critical value of Ginzburg–Landau parameter View the MathML source separates regimes of type-I and type-II superconductivity. The latter regime possess thermody...
A one-dimensional model intercomparison study of thermal regime of a shallow, turbid midlatitude lake
one-dimensional model intercomparison study turbid midlatitude lake
2014/12/12
Results of a lake model intercomparison study
conducted within the framework of Lake Model Intercomparison Project are presented.
Evaluation of WRF-SFIRE performance with field observations from the FireFlux experiment
FireFlux experiment WRF-SFIRE performance
2014/12/12
This study uses in situ measurements collectedfire model
WRF-SFIRE.
during the FireFlux field experiment to evaluate and improve the performance of the coupled atmosphere
Coupling a thermodynamically active ice shelf to a regional simulation of the Weddell Sea
thermodynamically active ice shelf regional simulation
2014/12/12
A thermodynamically interactive ice shelf cavity
parameterization is coupled to the Regional Ocean Model
System (ROMS) and is applied to the Southern Ocean domain with enhanced resolution in the Wed...
热力学理论方法可为混合物黏度模型开发提供有力支持
热力学理论 混合物黏度 物理性质数据
2014/10/29
热物性学的研究目的是描述物质的存在状态和性质,通过实验或理论方法获取物质的各种热物理性质数据,揭示物质热物理性质的内在规律,为科学研究和工程应用提供必要的基础。实践证明,可靠的热物性数据对于许多工程设计和科学研究是不可缺少的。
本文运用我以前写的上发的((宇宙运动循环平衡论))和((共振运动))的理论,揭示出地球上气温循环变化的四个周期,其中三个循环变化周期是地球与太阳的距离发生循环变化形成的。另一个变化周期是地球上物质产生不同的温室效应形成的,并找出了它们发生变化的原理。
从有序到混沌的自发过程,并非系统的唯一归途,而是受互易性作用所决定的一个特殊路径。绝对互易性作用是隐含在热力学第二定律中的前提条件,这个偏颇的前提有损普适性结论的可信性。由基于互易性与非互易性基本物理事实的角系数的“极性”观点出发,可以得出孤立系统有序内源性结论。无论有序内源还是外源,都是趋向稳定平衡的过程。非互易性决定的系统极化平衡点与系统初始极化状态的差异,决定了系统的具体的熵增或是熵减的自发...
Demonstration of Strong Near-Field Radiative Heat Transfer between Integrated Nanostructures
Thermal transport thermal radiation near-fi eld radiation microelectromechanical systems (MEMS) surface phonon-polariton
2015/8/6
Near-field heat transfer recently attracted growing interest but was demonstrated experimentally only in macroscopic systems. However, several projected applications would be relevant mostly in ...
CO2/HCs混合物宽区域黏度模型的热力学研究
Vesovic-Wakeham理论 黏度 CO2/HCs 二元混合物
2014/10/29
基于Vesovic-Wakeham理论,建立CO2/HCs二元混合物黏度预测模型,对CO2/CH4,CO2/C2H6,CO2/C3H8,CO2/n-C4H10和CO2/iso-C4H10这5种重要CO2/HCs二元体系的黏度进行了预测,温度范围为273.15~973.15 K,压力范围为0.1~200 MPa,最大黏度预测值达140 μPa·s。与大量文献实验数据的比较表明,所预测的黏度计算值具有...
分数阶理论下实心球体受热冲击作用的渐进分析
热冲击 分数阶广义热弹性理论 耦合效应 延迟效应 渐进分析
2014/4/2
基于分数阶广义热弹性理论,针对实心球体在外表面受均匀热冲击作用下的一维广义热弹性问题进行研究分析. 利用热冲击的瞬时特征,借助于Laplace 正、反变换技术及柱函数的渐进性质,推导了热冲击作用周期内位移场、温度场和应力场的渐进表达式. 通过计算,得到了不同传热能力下受热冲击作用时热波、热弹性的传播规律以及位移场、温度场及应力场的分布规律. 结果表明:分数阶参数取值的不同,热波、热弹性波的传播以及...