二次利用

A formula was proposed to explain the effects of secondary-scattering in the electron impact experiment, based on this formula, and the secondary-scattering coefficient as a function of the scattering angle was investigated.

在一定假设下利用公式解释了在电子碰撞实验中二次散射效应对实验测量的影响，并在此公式的基础上研究了对CO不同跃迁的二次散射系数随角度的变化关系。

In this paper the influence of the core structure , the winding configuration and, especially, the unequal gap lengths among the secondary coil pancakes on the stray field is studied by using the software ANSYS .

利用ANSYS软件计算多种情况下超导变压器的磁场分布，研究了变压器的铁心结构、绕组形式、二次绕组不均匀气隙以及不同的一、二次绕组线圈高度等因素对漏磁场的影响。

Because the 2nd harmonic of self inductance is larger than that of the mutual inductance, which is not agree with Park transform, so the saturated mathematical model under a, b, c phase coordinate system of pulsating magnetic field permanent magnet low speed synchronous motor is constructed.

利用有限元方法计算了脉振磁场永磁低速同步电动机参数变化规律，由于自感二次成分远大于互感二次成分，不满足Park变换条件，在a、b、c相坐标下建立电机饱和数学模型。

I take emphasis on the Object ARX which was adopted in this system. AutoCAD is not only used in product designs, but also make use of secondary development tools, realizing the parameter design of the product.

AutoCAD软件不但可以用来进行产品设计，而且还可以利用二次开发工具，实现产品的参数化设计，并可以针对用户的需求实现产品的二次开发，大大提高产品设计的效率。

In this paper,using the classification for the point of general surface in differential geometry,a new combination that relies on the type of point on real conicoids is studied,and then can know more about the shape of conicoid.

利用微分几何中对一般曲面上点的分类来研究实二次曲面依点的类型的又一重要新组合，从而对二次曲面的形状有进一步的认识。

It is an effective way to use the appropriate narrow bandgap nanosize semiconductors that is stable in chemical and biochemical conditions and not pollute the surroundings in reaction, which sensitizes nanocrysalline titanium dioxide carriers synchronously to prompt the utilization of the solar spectra and the efficiency of photocatalysis.

利用染料分子作表面敏化半导体材料和利用杂质掺杂来实现宽禁带半导体吸收光谱的扩展有一定的局限性，采用化学和生物惰性且对环境不产生二次污染的窄禁带半导体敏化同时考虑团簇颗粒粒径对载体性能的影响，是提高纳米二氧化钛光催化剂对阳光的吸收利用率和量子效率的有效方法。

The experiments for determining the reaction kinetics of Daqing atmospheric residue were performed in a continuous flow, expanded bed rector. Four-lumped reaction kinetic model was developed to account for various feed and product fractions of Daqing atmospheric residue (gases, gas oil, residue and coke). The amounts of olefins and alkyls in the gas products were further analyzed to determine reaction kinetics of gas product distributions. Hence, a combined five-lumped reaction kinetic model was obtained for catalytic pyrolysis of Daqing atmospheric residue. The kinetic constants both in four-lump model and five-lump model were evaluated. A simulator for catalytic pyrolysis process was developed by incorporating the five-lumped kinetic model into the hydrodynamic flow model.

其次利用改进的固定流化床装置考察大庆常压渣油催化裂解反应规律，筛选反应工艺参数；分析了催化裂解工艺存在的主要化学反应类型，提出了渣油一次反应和二次反应网络图；将反应原料油作为单独集总组分，而将产品中的轻质油、气体、焦炭分别作为集总，从而建立了四集总动力学模型；在此基础上，把气体产物中的目的产物低碳烯烃独立划分，得到五集总动力学模型；采用最小二乘法分析实验数据，分别得到四集总动力学模型和五集总动力学模型中各集总间相互反应转化的反应速率常数。

A supercritical heat-supply unit with a double reheat employs steam extraction from a low-pressure turbine cylinder for supplying process heat.

针对二次再热超临界供热机组采用低压缸分缸抽汽供热的特点，利用等效热降理论，进行分析与数学推导，得出了该类型机组抽汽等效热降和抽汽效率的计算方法，形成该类型机组的经济性定量分析数学模型，从而将等效热降理论的应用范围拓展到二次再热供热机组。

New factorized quasi-Newton equation not only uses the gradient information of the objection function ,but also uses the function information .

本文利用二次函数近似梯度的方法构造新分解拟牛顿方程，不仅利用到了目标函数的梯度信息，而且用到了目标函数值的信息，比传统的分解拟牛顿方程具有更高的二阶曲率逼近。

The check of mutation of video camera lens that offerred a kind to be based on BP nerve network newly calculates a standard, this algorithm chooses pattern plate to match poor cent and histogram 2 times 2 times to differ cent to serve as a feature, those who use nerve network from organization, self-study mutation of camera lens of implementation of ability of be used to detects, detect in order to flash next will raise detected dependability.

提出了一种新的基于BP神经网络的视频镜头突变检测算法，该算法选取模板匹配二次差分和直方图二次差分作为特征，利用神经网络的自组织、自学习能力实现镜头突变检测，然后以闪光检测来提高检测的可靠性。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。