混合结构房屋的基础设计

混合结构房屋的基础设计一般采用条形基础，按各墙体承受的荷载分别计算基础宽度．由于墙体的共同作用，应根据基础底面压应力的分布特点确定基础底面尺寸，文中分别按基础节点处矩形修正、对称和不对称线性修正导出了3种基础外形方案修正系数K的计算公式．计算表明，对于四墙相交的“ ”型节点．K值最大；三墙相交的“⊥”型或“「”型节点．K值较大；而两墙相交的“L”型节点，K=1，即一般可不必修正．该修正方法简便、实用，所得结果简单可靠，可直接用于基础设计．     

度和与图中具有给定阶数的点不交的路

设G是一个n阶图，n=∑^ki=1ni，其中,ni≥2(i=1,2,…，k）是整数。我们利用度和给出图G中存在n1,n2，…，nk阶点不交路的充分条件。     

发射本领εγ,T=辐射本领R?

分析了量子光学教材不同版本中关于发射本领与辐射本领两个概念的区别与联系,证明了辐射出射度M(T)=辐射本领R=辐射通量Ф0(T),而单色辐出度Mλ(T)=发射本领εγ,T(或εγ,T)=谱密度r(γ);从而澄清了极易混淆的6个概念,并就量子光学教材建设提出了若干建议.     

强相依高斯序列的最大值与和的联合渐近分布

{X_n,n≥1)是标准高斯序列,T_(ij)=cov(X_i,X_j)。本文在强相依条件rijlog(j-i)→r∈(0,∞)(j-i→ ∞)下,得到了高斯序列的最大值M_n与标准化部分和S_n=sum from i=1 to n(X_i/(E(sum from i=1 to n X_i)~2)/(1/2))     

关于(n,[n~c])=1的自然数

设c>0是一个非整数实数,x是一个充分大实数．令Nc(x)表示不超过x且满足(n,[nc])=1的自然数n的个数,本文得到了Nc(x)的渐近公式,改进了Delmer 和Deshouillers的结果．     

瞬子效应在0++胶球的QCD求和规则中的作用

利用包含瞬子效应的QCD求和规则计算了0⁺⁺胶球的质量上限,结果为1.3GeV.还探讨了变动瞬子参量时对QCD求和规则的影响,发现包含瞬子修正的QCD求和规则在瞬子大小为1/3fm时变得很稳定     

B→π跃迁形状因子中扭度为3的分布振幅

我们选择了恰当的手征流关联函数,用光锥QCD求和规则去计算B到π的跃迁形状因子,得到的结果仅仅依赖于π介子的3扭度光锥分布振幅.这样从f+?Bπ的研究中,我们就可以对π介子的3扭度光锥分布振幅给出一个约束条件.     

ON THE BOTTLENECK CAPACITY EXPANSION PROBLEMS ON NETWORKS

This article considers a class of bottleneck capacity expansion problems. Such problems aim to enhance bottleneck capacity to a certain level with minimum cost. Given a network G(V, A, C) consisting of a set of nodes V= {v1,v2,…,vn},a set of arcs A ■ {(vi, vj) | i=1,2,…, n;j=1,2,…,n} and a capacity vector C. The component cij of C is the capacity of arc (vi ,vj). Define the capacity of a subset A' of A as the minimum capacity of the arcs in A, the capacity of a family F of subsets of A is the maximum capacity of its members. There are two types of expanding models. In the arc-expanding model, the unit cost to increase the capacity of arc (vi, vj) is wij. In the node-expanding model, it is assumed that the capacities of all arcs (vi,vj) which start at the same node vi should be increased by the same amount and that the unit cost to make such expansion is wi. This article considers three kinds of bottleneck capacity expansion problems (path, spanning arborescence and maximum flow) in both expanding models. For each kind of expansion problems, this article discusses the characteristics of the problems and presents several results on the complexity of the problems.     

Improper Riemann Integral and Henstock Integral in ℝn

The Henstock integral in ℝⁿ and its relation to the n-dimensional improper Riemann integral are studied. A Hake-type theorem for the Henstock integral in ℝⁿ is proved.__________Translated from Matematicheskie Zametki, vol. 78, no. 2, 2005, pp. 251–258.Original Russian Text Copyright © 2005 by P. Muldowney, V. A. Skvortsov.     

桩底压浆灌注桩设计探讨

简要介绍了桩底压力灌浆施工工艺的类型,总结了桩底压浆灌注桩的优点,针对设计中存在的问题,提出在设计此类桩型过程中应该注意的事项。