查询词典 mathematical

By observing and analyzing 3D structure of apple flower and inflorescence, we raised the 3D structure mathematical model of anthocaulus, receptacle, calyx, petal, androecium and pistil.

为了实现对苹果花及花序三维形态结构的交互设计、几何建模和真实感现实，提出了精确描述苹果花序三维形态结构的数学模型及可视化方法。

Since her powers are grounded in anear mathematical understanding of magical learning,her attacks are based on probabilities.

自从她的力量是建立在附近的神奇的学习数学理解，她的攻击是基于概率。

The main work and the originality points of this dissertation could be concluded as the following parts:(1) To analyze systematically the mathematical model of LES of air flow in great space, under the case of isothermal and non-isothermal, as well as the combined action of buoyancy and strain. Some basic problems are studied about the LES application into airflow simulation of great space, such as boundary conditions, spatial difference scheme and time advancing scheme, time step etc., which creates the basis for the LES application to indoor airflow simulation.(2) Both the instantaneous and time averaged flow field of great space with multiple jets under isothermal and non-isothermal cases are explored with large eddy simulation method, and also discussed the dynamic characteristics and the law of fluidflow in the great space.(3) Based on the results of LES of the great space and the Fanger thermal comfort indexes, it is brought forward the concept of the series of dynamic thermal comfort evaluating indexes, which could be divided into thermal comfort index with time averaged properties PD, PPD, PMV, thermal comfort index with instantaneous properties IPD, IPPD, IPMV, and time averaged thermal comfort indexes TAPD, TAPPD, TAPMV, and transient situations time averaged thermal comfort indexes TTAPD, TTAPPD, TTAPMV. The differences among them and the calculation methods are discussed, and the four kinds of indexes are calculated with the thermal comfort index PD as an example.(4) Based on the LES results it is discussed the hot air stratification phenomena in air-conditioned buildings in the case with air supply and return registers on the ceiling and the case on the sidewall. The fundamentals of the hot air stratification are studied and the relations of estimating hot air stratification are brought forward.(5) With the advanced apparatus such as hot wire film anemometer IFA300 and laser particle field anemoscope, corresponding model test and site measurements have been done, which are compared with the simulation results and LES is proved a very promising method in air flow simulation indoor.

本文主要工作既创新点体现在以下几个方面：(1)系统分析了等温、非等温和考虑剪切力与浮升力综合作用的高大空间大涡模拟数学模型，并研究了高大空间大涡模拟在室内气流仿真应用中的一些基本问题，如边界条件、空间离散格式和时间推进格式、时间步长选择等问题，为大涡模拟在室内气流计算中的广泛应用打下了基础；(2)首次用大涡模拟方法研究了高雷诺数下高大空间多射流在等温、非等温情况下的瞬时流场和时均流场分布，并探讨了多射流流场的动态特性和流动规律；(3)基于大涡模拟的动态仿真结果和Fanger的热舒适指标，首次系统地提出了动态热舒适评价指标体系的概念：即基于时间平均参数的热舒适指标PD、PPD、PMV；基于瞬时参数的瞬时热指标IPD、IPPD、IPMV；基于时间平均热舒适指标TAPD、TAPPD、TAPMV；以及沿行动迹线的时间平均热舒适指标TTAPD、TTAPPD、TTAPMV，并分析了四类热舒适指标的差异性和计算方法，还以PD值为例对四类指标分别进行了计算；(4)基于数十种工况下空调房间大涡模拟的结果，研究了空调建筑上送上回和侧送侧回两种情况下热分层现象，并探讨了热分层的基本规律，首次提出了避免热分层现象的判断公式；(5)在暖通空调领域，首次使用IFA300热线风速仪、激光粒子速度场仪等先进设备，完成了与大涡模拟相对应的模型试验，并把实测结果与仿真结果进行了对比，说明LES在室内气流仿真方面是一种很有前景的方法。

The hydraulics are many more abstract concepts, such as water down on the physical process Flash animation can be used to form the wall with time changes, Piezometric head with time changes, pressurized pipe flow direction using flash animation shows, to reflect the vertical bisector and angle bisector of the rich multimedia features of the form can abstract mathematical concept into accommodation acceptable to the visual form.

在水力学中有许多较为抽象的概念，如水击的物理过程，可以用FLASH动画的形式将管壁随时间的变化过程，测压管水头随时间的变化过程，有压管中的水流方向用flash动画表现出来，以体现垂直平分线和角平分线的特点多媒体丰富的表现形式能使抽象的数学概念变为学生容易接受的直观形式。

The hydraulics are many more abstract concepts, such as water down on the physical process Flash animation can be used to form the wall with time changes, Piezometric head with the time change, pressurized pipe flow direction using flash animation shows, to demonstrate vertical bisector and angle bisector of the rich multimedia features of the forms make an abstract mathematical concept into accommodation acceptable to the visual form.

在水力学中有许多较为抽象的概念，如水击的物理过程，可以用FLASH动画的形式将管壁随时间的变化过程，测压管水头随时间的变化过程，有压管中的水流方向用flash动画表现出来，以体现垂直平分线和角平分线的特点多媒体丰富的表现形式能使抽象的数学概念变为学生容易接受的直观形式。

A fixed angle in advance of the mathematical model for tracking and simulation code.

详细说明：固定提前角法跟踪的数学模型及其仿真程序代码。

The mathematical model of spatial trajectory of torpedo tracking and perpendicular target hit is derived, and the guidance rules combining variation of advance angle and bearing proportion are presented for the first time.

基于面向对象技术，对鱼雷跟踪和垂直命中目标空间弹道进行了仿真和分析。

The mathematical model for predicting the hydraulic and aeration characteristics of aerator is established and the correction for the emergence angle of the jet is deduced.

一般对Fr＜7的低Fr数流动情况，掺气设施水力及掺气特性与高Fr数流动情况有显著差别，掺气设施的设计也有其特点。

An adaptive grid scheme controlling cell area is used to generated grids in the divergent section of symmetric annular nozzle, and the generated grids are used in the flowfield calculation through the uncoupled way. The elliptic equations are used to generate grids in three dimensional regions of FDN divergent section, the source terms used in the equations employ a mathematical form which is independent of the boundary shape and of the boundary grid point distribution, the free parameters contained in the source terms are determined by the two restraint conditions, the intersection angle of transverse grid lines with boundaries and the local curvature of the transverse grid lines at the boundaries, and the interior grid distribution controlled directly by the grid point distribution assigned on the boundaries is realized, it makes the grid more clustering near the nozzle wall. For the generated grids in the whole computational regions have a good smoothness and orthogonality, the accuracy of calculation in the flowfield is ensured.

对轴对称的环形喷管采用控制网格面积的自适应网格方法对扩散段部分进行了网格生成，并通过非耦合方式应用于喷管的流场计算中；对强制偏流喷管扩散段内的三维区域采用椭圆型方程进行网格生成，方程中的源项采用了与边界形状和边界网格点分布无关的数学形式，源项内的自由参数由横向网格线与边界的交角及横向网格线在边界处的局部曲率两个约束条件来确定，实现了由边界上的网格分布直接控制内部的网格点，使壁面附近具有较密集的网格，并且在整个计算区域内的网格都具有良好的光滑性和正交性，从而保证了流场计算的准确性。

In order to research the flow mechanics inside tube inserted with twisted-leafs discontinuously,a mathematical model for turbulent flow resistance was developed,and the influence of the twist angle α and the swirl angle β on the form drag was analyzed by numerical simulation.

为了研究管内间隔插入旋流片的流动机理，建立了流阻数学模型，通过数值模拟分析了旋流片的旋转角α和旋流角β对j(形体阻力与摩擦阻力的比值)的影响。

Metrorrhagia is also gynaecological problems of common diseases.

崩漏是妇科常见病也是疑难症。

WordFTP gives you the convenience and timesaving you need.

wordftp让您的方便和省时您所需要的。