查询词典 sum formula

The formula for lower limit of natural frequency of tapered pier of continuous beam bridge were derived by the combination of Rayleigh and Southwell method. The natural frequency of tapered pier was composed of the sum of frequency of each subsystem consisted in inertia component and deformable component.

采用瑞利法和Southwell频率合成法，将基频表示成各惯性元与复位元所组成的子系统的频率合成，导出了变截面桥墩自振频率下限的计算公式。

From three respects in calculus teaching, this paper has mainly discussed magical effect of physics meaning of questions, which is curve integration curved surface integration and sum of series formula.

微积分的教学离不开问题的物理意义，文章从曲线积分、曲面积分以及级数求和公式的推导等三个方面来说明问题的物理意义在微积分教学中的妙用。

The object of this paper is to derive a general formula to evaluate the sum of the series wherein N may be any positive integer.

的求和。本文目的在于得到一个N为任意正整数的通式，对于任何N均可直接套用，而且这个结果也可作为一个不难实现的计算机用算法。

In this paper a new recursive DFT is proposed based on sum-and-difference formula of trigonometrical function and solution of linear equations. Its computation work is nearly the same as that of traditional recursive DFT, but it can solve many problems effectively which can't be solved easily by traditional recursive DFT, such as algorithms for overcoming attenuation direct-current component part existing in power system.

文中基于三角函数的和差公式以及线性方程组的求解，提出了一种新的递推离散傅里叶变换算法，它的计算量与传统递推算法接近，但可以解决传统递推算法不易解决的许多问题，如适用于人们提出的克服电力系统中衰减直流分量对DFT影响的一些方法中，因而具有广阔的应用前景。

Based on a computing model of floor heating residences, indoor thermal environment and heat distribution under the effect of heat charge/discharge, operation control and solar radiation has been concluded. Concept and formula of equivalent heat supply has been put forward which indicate that actual heat supply will be equal to the sum of design heat supply and equivalent heat supply. Recommend coefficient has been given taken Dalian as an example. Computed according to the new method, design heat supply can be reduced to 37% in cloudy day and 43.3% in sunny day, energy saving effect is very obvious. In Tromb wall solar house, effect of concrete wall on indoor temperature swing and attenuation of temperature wave is very obvious. While the outdoor air-temperature swing exceeds 10℃, indoor air-temperature swing belows 3℃. In the experiment, maximal difference in temperature between inner surface and outer surface of the 300mm wall exceeded 10℃. Heat storage and collector efficiency varies adversely according to solar radiation. Factors such as thickness, material, absorptance of the wall and permeation of the glass cover all have big influence on heat storage and collector efficiency. There exsisted an optimal thickness of the wall, which can make the best of heat storage and collector efficiency. Most of the heat stored in conventional Trombe wall during the daytime has been lost to the outside at night without heat preservation. Heat preservation on the outside surface of the wall has effectively improved heat release performance of the wall at night, heat supply to the room has increased too.

通过建立的地板采暖系统动态热性能分析模型，得出了在蓄放热特性、运行方式和太阳辐射等因素耦合作用下的室内热环境及热量分配比例，提出了等效供热量的概念及计算公式，指出实际所需供热量应等于设计供热量加上等效供热量，并以大连为例，给出了等效供热量的修正系数，以新方法计算，阴天可减少设计供热量37％，晴天最大可以减少设计供热量43.3％，节能效果显著；集热蓄热墙式太阳房中，混凝土蓄热墙的室温均一化效果和对温度波的削减作用非常明显，当室外温度波动最大幅度超过10℃时，室温波幅不超过3℃，实验中300mm厚墙体内外表面温差超过10℃；墙体蓄热效率与集热效率随太阳辐射照度的变化呈相反的变化趋势；墙体厚度、材料、表面吸收率以及盖板透过率等因素对集热和蓄热效率均有较大的影响，存在一个最佳的墙体厚度值，使得墙体集热和蓄热综合性能最优；传统的蓄热墙夜间没有外保温，辐射散热损失很大，研究表明墙体外保温方式明显改善了蓄热墙夜间的散热性能，增加了向室内的供热量。

Originally, be tasted specifically for purebred pet dog by careless growth law but be designed that, the fleetness is clean , sterilize except that dislodges pet peculiar smell, special addition kills insect the chrysanthemum ester waits for the health care element , provide protection to pet easy to catch a skin disease , mild the formula not stimulating not bursting into tears, contains the vitamin C sum vitamin E fresh fruit cream having beautiful skin effect , from outward appearance to inner essence, hair pours a vigour in , accelerates a pore secreting fat , improves an assimilation of the new and excretion of the old for every, fragrance mild and fragrant , refreshing no greasy Shu effect, Let the dog be brimmed with energy and vitality by hair health.

本品针对纯种爱犬被毛的生长规律而设计，快速清洁、杀菌除蟲、去除宠物异味，特别添加杀虫菊酯等保健元素，对容易得皮肤病的宠物提供保护，温和的不刺激的不流泪的配方，蕴含具有美肤功效的维他命C和维他命E鲜果精华，由表及里为每一根毛发注入活力，加速毛孔分泌油脂，改善新陈代谢，温馨的芬芳、舒爽不油腻的效果，让狗狗被毛健康，神采焕发。用适量温水将爱犬被毛浸湿后，将适量香波涂于全身，并轻轻按摩揉搓5分钟，用清水彻底清洗干净即可。

The lookup function did a pseudo Euclidean distance formula by calculating the sum of the absolute value of the difference between each sample finger print a finger print from the dictionary.

查找函数做了伪欧几里得通过计算了各样本之间的差异从指纹一个指纹字典绝对值距离公式。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。