The minimum shear resistance of beams in the paper is close to the one in the code for design of concrete structures " gb50010 - 2002 ' . according to the actual project , the destroy of 448 kinds of beams are analyzed by computer by taking account of the effective coefficient " " of the strength of concrete confined by hoops , the relationship with the section property of beams , the critical point of the arch - rib failure transiting to the shear - compression failure which is advanced in the anti - theory , and the contribution to the beam ' s shear resistance of the concrete in the shear - compression zone 引用箍筋约束混凝土的有效系数，利用其与梁截面特性的关系并结合理论分析中提出的梁剪压破坏与斜压破坏的分界点，同时考虑了剪压区混凝土的抗剪贡献，从工程实际出发，编程拟算了448种梁构件的破坏情况，计算结果表明，梁发生在剪压破坏范围内的最大抗剪承载力值比混凝土结构设计规范gb50010 - 2002值略高。
By representing the essential features of section function , and presenting the theorem on discussing the limit , continuity and derivative at the boundary of section function , the article shows the reason why to choose the boundary of section function to discuss , and the method how to discuss them , while discussing the limit , continuity and derivative of section function 摘要文章通过阐述分段函数的本质特征，给出讨论分段函数在分界点处极限、连续性及导数的定理，解决在讨论分段函数的极限、连续性及导数时，为什么要在分段函数的分界点处进行讨论以及怎样讨论的问题。
According to the supply system composed by parallel connection water pump , many kinds of operation proposals in a single pump were put forward to provide the greatest possible flow on both sides of the demarcation point in the scope of the flux changes ; identified the system of pumps , electromotor , speed governor imitate method of characteristics curve of the power device and its rotating speed , efficiency , energy consumption calculation under different condition ; the analytical methods used for the operational plan for comprehensive evaluation of the economic and safety and optimal results 摘要针对由并联水泵组成的供水系统，提出了在以单泵可能提供最大流量为分界点的两侧流量变化范围内具有多种运行方案；确定了在不同工况下，该系统中水泵、电机、调速器特性曲线的拟合方法及其各动力装置中转速、效率、能耗的计算式；采用解析的方法对各种运行方案进行了经济性和安全性综合评价，并给出最优结果。
A method for complicated planar contour fitting is presented : 1 ) first all the data points used in the contour are ordered ; 2 ) after calculating the curvature of each contour point , the points with bigger curvature are taken as feature points ; 3 ) the contour is segmented by feature points ; 4 ) the contour is globally constructed through determining the segments types ( line or circle ) and the constraints with the neighbor segments ? the generation of skin surface is realized with the interface of caa 研究了基于点云数据的复杂截面线生成技术： 1 )对轮廓数据点进行排序； 2 )近似计算轮廓数据点处的曲率，取出曲率较大的数据点，并定义取出的数据点为特征点； 3 )以特征点为分界点对轮廓数据点进行分段： 4 )判断分段数据点确定的曲线类型和各分段曲线之间的约束关系，进行基于约束的分段平面轮廓曲线整体拟合。
Because in the drinking water has the slight pollutant content to be low , may use the ideal solution adsorption theoretical model ( iast ) to process , the result is satisfying , this model to studies the activated charcoal to add water has the slight pollutant the adsorption rule to have the extremely important guiding sensein addition , the solute measurement replacement adsorption model ( sdm - a ) also obtained to the above research system has imagined not the but actually result , namely appeared " v " the glyph extension broken line in adsorption isothermal chart 鉴于饮用水中三氯甲烷含量较低,采用理想溶液吸附模型( iast )来指导其吸附动力学的研究,结果令人满意,另外,溶质计量置换吸附模型( sdm - a )应用于上述研究体系也取得了意外收获。即在其吸附等温线图上出现了“ v ”字形的转折线。该点对应饱和吸附量,可用来判断单分子层和多分子层吸附的分界点。
It is desirable for all related insiders and outsiders to discern all potential risk in advance . this paper , with the adoption of special treatment resulted from abnormal financial position as the indicator of financial distress , the univariate variable analysis and multiple variable analysis as the research approach and some financial ratios as variable , tries to find an optimal financial distress prediction model of chinese manufacturing listed companies based on public accounting data . our finding demonstrate that five general financial ratios and three ratios concerning the cash flow have better predicting ability , the erroneous classification ratio are low . these five general financial ratios are earning per share , return on net assets , return on gross assets , growth rate of net profits , growth rate of net assets ; the three ratios concerning the cash flow are net cash flows from operating activities per share , net re - earnable cash flows / current liability , net cash flows from operating activities / net profit 研究结果表明，在单变量分析中，每股收益、净资产收益率、总资产报酬率、净利润增长率、净资产增长率这5个财务比率的错分率较低、预测能力较强；经营活动净现金流量与净利润之比、每股经营现金流量、可重复赚取的现金净流量与流动负债之比这三个现金流量财务比率对于预测上市公司财务困境具有有效性；多变量分析中，应用费雪判别分析和典则判别分析得到两个判别模型，在典则判别分析中，应用两种方法确定所建模型的最佳分界点，检测证明应用所得两个判别模型进行财务困境预测的准确率很高。
