近似计算

This kind is based on the computational means of PPV, the means of unlike tradition, can become good proportion to shrink with H gather size put a concern, and this kind of technology also can be in bigger PPV obtains similar result on gather, a few more contented to individuation of aggregate of aleatoric preference webpage computation asks.

这种基于PPV的计算方式，不像传统的方式，能够和H集合大小成良好的比例缩放关系，并且这种技术也可以在更大的PPV集合上取得近似的效果，满足一些对于任意偏好网页集合的个性化计算要求。

In the thesis, I introduce a new method to calculate the amplitude for gluon radiation on the base of helicity amplitude approximation.

在本文的研究中，我们还介绍了螺旋振幅近似的计算方法，并在此基础上发展了一种计算胶子辐射振幅的新方法。

With methods of limited areas, root systems of plant individuals were limited in a specific range, providing definite spatial boundary and solid basis for calculation of water requirement needed by plant individuals. On the basis of calculation of amount of water requirement, areas needed by every species to ensure enough water requirement are as follows: Populus simonii is 80.3m〓, Ulmus macrocarpa is 35. 4m〓, Artemisia halodendron is 7. 0m〓, Salix gordejvii is 11. 2m〓. Prunus armeniaca is 15. 2m〓, and Caragana microphylla is 15. 6m〓. The corresponding rational density of plantation which can maintain soil water balance and can ensure plantation stability is 125 individuals/ha for Populus simonii, 285 individuals/ha for Ulmus macrocarpa, 625 individuals/ha for Prunus armeniaca, 625 individuals/ha for Caragana microphylla, 833 individuals/ha for Salix gordejvii, and 1428 individuals/ha for Artemisia halodendron, respectively.

运用有限面积法将植物根系限制在明确的边界内，为植物耗水量的计算提供了一个明确的空间边界范围和可靠的基础，探索性和尝试性地得出了近似野外真实状态下植物个体的耗水量，以此为基础计算得出小叶锦鸡儿、山杏、黄柳、差巴嘎蒿、榆树、杨树等树种的水分营养面积分别是15.6m〓、15.2m〓、11.2m〓、7.0m〓、35.4m〓和80.3m〓，与此对应的能够维持林地土壤水分平衡和林分稳定性的各树种人工林的合理密度为：杨树125株/公顷，榆树285株/公顷，杏树625株/公顷，小叶锦鸡儿625株/公顷，黄柳833株/公顷，差巴嘎蒿1428株/公顷。

Based on pole model of lathe, thickness of side-board is treated as design parameter. This problem becomes a nonlinear problem, but it may become a linear problem using method of differential coefficient. Through method of calculating energy of sub-structure, thinking of each board separately, so getting final results rapidly.

以机床立柱模型为例，将模型的侧板板厚作为设计参数，并运用微分近似的方法，将非线性问题简化为线性问题求解，推导出了适用于板结构设计的计算公式，并通过计算子结构能量的方法，将每块侧板分开来考虑，降低了对计算机处理能力的要求，从而快速得到最终结果。

In this paper we present the results of a theoretical study of the focusingproperties of a symmetrical two-cylinder lens with identical radii and negligibleseparation for relativistic electron beams.

本文提出相对论情况下双圆筒静电透镜的聚焦性质，得出在薄透镜近似下的解析公式，并给出计算实例及与数值积分计算相比较。

In the improved algorithm, the computation of three-order time derivative is replaced by convolution approximate calculation, which simplifies the computation process and reduces computation amount, and is high effective and robust.

改进算法用褶积近似运算代替时间3阶导数的求解，因此简化了计算过程，减少了计算量，是一种高效稳健的算法。

In-situ monitoring gave the following results: 1 a tension stress zone occurred at the bottom of reinforced rock mass which indicated that the role of rock bolting was remarkable; 2 stress concentration at surrounding rock of main shaft was gradually transferred from shaft wall to complete rock mass far from shaft center; 3 vertical displacement was gradually smaller from up to bottom and from center to outside of the reinforced loose rock mass.

首先，建立了主溜井三维有限元计算模型，模拟了主溜井围岩的塌落破坏过程和加固后的加固体的稳定性及变形特性；同时，还采用多点位移计等对加固体的稳定性进行了实地监测。计算结果表明：网棚锚注加固体的纵剖面上的压力和位移规律是①加固体下部局部出现拉应力区，表明锚杆的使用是合理的；②加固体内的应力由塌落中心向周围围岩过渡，应力越来越大，最终将荷载传至围岩中；③从下到上下沉逐渐减小；④从加固体中心到周围下沉位移逐渐减小，且近似一条抛物线。

The band structures and the band gaps of some single-walled carbon nanotubes were calculated and their ...

但是，一方面，那些结论大多数是对孤立的单壁碳纳米管而言的，而且跟实验没有很好的吻合；另一方面，采用的方法大多数是紧束缚计算和基于局域密度近似的第一性原理计算。

With this method, the nextto-leading order Debye screening mass was evaluated within real time hot QCD. Since the gluon damping rate was included self-consistently on the internal line of the self-energy, the infrared divergences were removed without putting by hand in a nonperturbative magnetic mass as a cutoff, and the results are positive and gauge-independent. In addition, the selfconsistent calculation method of the damping rates of the fast moving particles in a QGP was suggested, the self-consitent equations were derived at finite tempeature without infrared divergences, and the approximation solutions were shown. Meanwhile the relaxation times of the gluons and quarks were estimated as τ〓～0.7fm/c and τ〓～1.5fm/c at energy scales of RHIC and LHC.

用这种自洽方法从实时热QCD出发用计算了QGP中次带头阶Debye屏蔽质量，由于自洽包含了胶子自能内线中横胶子的衰减率，克服了红外发散的困难，不必用手加的非微扰磁质量作截断，证明了得到的结果是正定的且规范无关，同时本文给出了QGP中快速粒子衰减率的自洽计算方法，推出了有限温度下快速粒子衰减率的自治方程且红外发散不出现，给出了方程的近似解，并估计了RHIC和LHC能标下胶子和夸克的弛豫时间分别为τ〓～0.7fm/c，τ〓～1.5fm/c。

We used different methods to calculate luminosity in order to assure its reliability. Structure function method is adopted to derive the radiatively corrected cross section whose accuracy is up to 1%. The corrections from vacuum polarization and effect of energy spread are also studied. The final analytical approximation formulaes of the observed cross sections are worked out. Different fitting methods are carried out to fit the resonances according to different requests.

模拟的分布图的仔细对比，并兼顾实验的要求，得到每种事例对应的选择条件，特别是在处理积分亮度时，更是采用了不同的方法，以保证亮度计算的可靠性；采用结构函数的方法推导出截面的辐射修正公式，精确度达到了1％的水平，研究了真空极化给拟合公式带来的修正，并考虑了束流能散的影响，计算出最终的观测截面的解析近似式；对于三个共振态的拟合，针对不同的要求，采用了不同的拟合方法；同时在M.C。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。