Abstract:Based on the three basic principles of hydraulics,a discharge correlationequation and a new submergence standard for automatic turning gate controlled by hydraulic pressure are established.A very difficult hydraulic problem for calculating theturning gate
Abstract:The relationship between the determination of dummy activities and set.of tight front activities is discussed,the main dummy activities are determined by decomposing the set of tight front activityies into the intersection subset, and the numerical proces
Abstract:本文讨论了二阶椭圆型方程组在p次多项增长情形W ̄(1,P)∩L ̄q广义解的高阶可微性.
Abstract:In this paper,the definition of V-dimension is given,and the formulas ofthe V-dimension of self-affine sets are obtained.
Abstract:本文证明了,在适当的假设上,一致严格拟凸、多项式增长且是C ̄(2,a)类(0<a<1)的函数F:Ω×R ̄(nN)→R,其多重积分的E-L方程的每一个光滑解,在Ω中充分小的支集上都是该多重积分的极小值。
Chen Tongsen Liang Benxi He Bo Cao Zhixiang
Abstract:本文研究了在新两性表面活性剂N-[N'-(羧乙基)-N'-(2-羟乙基)氨乙基]月桂酰胺钠盐(CEHEAELA)和十二醇聚氧乙烯23醚(Brij-35)存在下,铁(Ⅲ)与邻硝基苯基荧光酮(O-NPF)的显色反应.在pH6.0~9.0的HAc-NaAc缓冲介质中,Fe(Ⅲ)与O-NPF形成1:3的桔红色配合物,最大吸收波长在580nm处,表观摩尔吸光系数ε_(580)达1.40×10 ̄5L·mol ̄(-1)·cm ̄(-1),铁(Ⅲ)浓度在0~0.48ug/mL范围内符合比尔定律.方法用于水样、人发及铝合金中痕量铁的测定,结果满意.
Shu Zhen Liu Jinshui Yuan Bin Zhang Fuquan Zhou Shaorong
Abstract:挤压铸造可细化Zn-Al43型合金的铸态组织、减轻枝晶偏析、大幅度提高其力学性能,抗拉强度提高40~80%(100~150MPa),延伸率提高至10%以上,合金的耐磨性亦进一步提高.挤压铸造对合金组织的影响与凝固冷却速度的加快以及合金的平衡凝固温度升高有关,合金塑性、韧性显著改善的首要原因是枝晶间显微缩孔的消除,而合金强度的提高则主要是过饱和固溶体中的脱溶过程导致沉淀硬化与分散硬化的结果.
Abstract:The existence of nontrivial solution of some nonlinear elliptic problemsin exterior domains is discussed in this paper,and an important compactness lemma isobtained.
Abstract:本文利用局部紧群的中积表示的正交,讨论了相应变换的一些性质。
Abstract:本文提出了一种新的求解动力响应问题的逐步积分法,这种方法将加速度假设成分段光滑二次多项式,具有时间步长的三阶以上精确度,其每次步进所需求解的线性代数方程组的阶数和自由度数相同,由于其公式系统中引入了自由参数α,β,r理论上,可望通过适当选取a,β,r的值而使它无条件稳定并具有良好的人工阻尼性质。
Abstract:The bending problems of plates are solved using the finite analyticmethod(FAM)in this paper,the system of algebraic equations of the method is derived, and some computational examples are given. The calculating results show thatthis is an effective method
Liu Luxiang Liu Jianzhang Luo Chongchang Qin Yuzhong
Abstract:The belt wear is always one of the important factors of affecting grindingaccuracy,surface quality,processing efficiency and product cost.Previous study wasonly limited to the wear of general abrasive belt.In this paper, the wear process, thetypical wear
Abstract:通过轴向压力作用下棒料塑性切口工试验,获取了剪切分离面上断裂区形态,结果表明:断裂区呈对称月牙状,断裂面积比率随轴向压力的增大而减小。结合理论分析,提示了剪切过程中裂纹首先产生于棒料上活动剪刃与固定剪刃交叉的两水平端点,并沿活动剪刃和固定剪刃刃口迹线扩展。裂纹为Ⅱ、Ⅲ型的混合型,其中Ⅲ型裂纹扩展速度对于断裂区形态起着决定作用。
Abstract:This paper describes a variation parameter die CAD system for an eletri-cal machinery plant.The system can automatically both output the drawing of dies andmark the dimensions on the drawing by using the principle of group technology,the dynamical paramet
Abstract:New realization of neural networks is presented by using MOS transis-tors in current-mode domain. The neural circuits are simple in structure and easy in im-plementation with MOS VLSI.The new neural net circuits work both in current-modeand in voltage-mod
Abstract:本文利用双结型晶体管的非线特性,设计出了一种在神经网络中广泛使用的S型函数神经元电路,此电路的输入输出信号都是以电流的形式出现的,电路的输入和输出级以电流传送器CCⅡ为核心构成,此电路的Pspice仿真模拟结果和理想情况非常吻合。
Abstract:Based on generalized reactive power theory and the orthogonal transfor-mation,the expressions of comprehensive current are derived,and the constitution andoperation principle of the static active compensation are put forward.Using PWM technique,we can com
Abstract:本文从磁化强度M出发,利用等效磁荷模型推导了以等效磁荷面密度σm为未知变量的边界积分方程,同时与全标量位ψ为未知变量的边界积分方程进行了对比分析,指出了它们各自的优越点。实测结果证明了本文的数学模型与所编计算程序的正确性。以此为基础,可以计算工程实际中的电磁装置的场分布和其他所需要的电磁参数。
Abstract:Based on the virtual work increment equation for the three dimensionalcontinum and stress-resultant yield surface plastic rule,the updated Lagrangian formulation is developed,and a new type of geometric stiffness matrix is presented.The numerical examples
Gong Jiansen Shu Qingsong Zhu Shiliu Ma Changhan Chen Weiping Tan Jufang
Abstract:本文对铝渣复合脱硫剂在可锻铸铁和ZG45Mn铸钢中的炉外脱硫作用与效果进行了系统的试验研究和理论分析,表明,采用石灰-铝渣-萤石固态复合脱硫剂可使可锻铸铁、铸钢脱硫率高30-40%。同时可改善可锻铸铁中的石墨及夹杂物形态,提高机械性能,并可缩短可锻铸铁第一阶段石墨化退火时间,为铝渣在冶金工业中的综合利用开辟了新途径。
Wang Jihui Guan Yinglian Zeng Le
Abstract:The adsorbent obtained by proper processing of sepiolote has more effec-tive desulfurization,is suitable for treatment of waste gas with low concentration SO_2,and is desorbed and regenerated easily,The SO_2 desorbed gas can be used for makingsurphric aci
Abstract:Eight economic indexes are chosen as an evaluation index system. Applying the entropy technique,the weighting of each index in the evaluation is determined.Each evaluated enterprise is calculated using the indeal point method;the distance of the direct co