一种新的三环网络TL(N;1,s,s+1)直径求解方法

基于多环网络的直径是衡量网络效率的重要指标,提出了一种新的有向三环网络TL(N;1,s,s+1)的直径求解方法——等价三叉树方法,并得到了一种新的直观图——三叉树.采用C#语言和SQL Server2000仿真实现了三叉树的结构模型.研究了该三叉树的性质,给出了三叉树的构造算法.找到了该族三环网络直径d(N;1,s,s+1)最大值、最小值的分布规律.仿真结果表明:直径的最大值随N值的增加呈有规律的锯齿状波动增加,直径的最小值随N值的增加呈有规律的阶梯状增加,并给出了直径d(N;1,s,s+1)的上界与下界的显式公式.     

矩阵广义逆A{2,3}s,A{2,4}s的构造

介绍复矩阵Ａｍ×ｎ的Ｍｏｏｒｅ－Ｐｅｎｒｏｓｅ广义逆Ａ＋的一些基本理论，并且利用Ｍｏｏｒｅ－Ｐｅｎｒｏｓｅ广义逆给出Ａ｛２，３｝ｓ，Ａ｛２，４｝ｓ的构造     

关于(a,b,s)-临界图的邻域条件

设G是一个n阶的图.设a,b和s是整数,使得b＞a≥1.设δ(G)是G的最小度.证明了:如果δ(G)≥(k-1)a+s,n≥(a+b)(k(a+b)-2)/b,并且|Nc(x1)∪NG(x2)∪…∪NG(xk)|≥an/(a+b)+s对V(G)任意的独立子集{x1,x2,…,xk}都成立,这里k≥2,则G是一个(a,b,s)-临界图.这个结果在某种意义上是最好的.     

扇图与轮图的[r,s,t]-着色

A.Kemnitz和M.Marangio提出了[r,s,t]-着色的概念,推广了正常的点着色、边着色和全着色。现在讨论当r,s,t满足一定条件时的扇图和轮图的[r,s,t]-色数。     

均匀销售库存模型的(s,S)进货策略

瞬间销售库存模型的（ｓ，Ｓ）进货策略简便易行，但对大多数商品销售不能适用。在均匀销售条件下，就离散型随机需求导出了（ｓ，Ｓ）进货策略，扩大了这种经营策略的适用范围。给出了简便的算法和计算实例．     

Erds猜想,Pell序列和丢番图方程

1. Introduction and Results 1.1 Erds conjecture In 1939, Erds conjectured that the equation (_m~n)=y~k, n>m>1, k≥3, (1)has no integer solution, where(_m~n)is a combinatorial number. In 1951, Erds himself proved that the conjecture is right when m>3, leaving the cases m=2 and m=3 unsolved (see Ref.[1]). In 1984, we proved that (_2~n) (n>2) is never a 2kth power if k>1. Since equation     

基于(T,s,S)策略的维修器材联合订购模型与算法

针对随机需求条件下的多品种维修器材联合补充问题,提出了一种新的策略——(T,s,S)策略,并建立模型。设计了一种混合RAND算法,求解该策略的各参数。结合实例对策略和算法进行验证,结果表明:新策略比文献中的(T,S)策略更加节省经费,新策略能确保维修器材的服务水平,对维修器材库存控制不失为一种满意的方法,对维修器材供应保障研究有一定的参考价值。     

岩体经验强度准则及其强度参数m,s的确定方法

本文结合最新研究成果，详细介绍了岩体经验强度准则和参数m,s的确定方法，以为岩土工程界更好地应用Hoek-Brown或度准则有所启迪。     

MD5（0,δb,δc,δc）-消息对Pollard＇s rho搜索算法设计

MD5选择前缀碰撞攻击可应用于伪造CA证书等实际攻击中,构造MD5选择前缀碰撞对是攻击MD5的一个重要研究课题。构造MD5选择前缀碰撞消息对时,需要利用高性能计算设备搜索（0,δb,δc,δc,）-消息对,文章用概率方法描述了生日攻击的原理,阐述了利用生日攻击思想搜索（0,δb,δc,δc,）-消息对的Pollard＇s rho算法和并行Pollard＇s rho算法,分析了算法的复杂度,最后给出了一组实验数据。     

Mercury’s ring current and Mercury’s magnetic storms

Science China Technological Sciences -     

Ethik-Cafés in der geriatrischen Langzeitpflege: halten sie,was sie versprechen?

Definition of the problem Ethics cafés in long-term geriatric care are considered as ethical education. They allow the participants to have an open discourse in a casual setting about moral issues related to daily work. In the literature, various characteristics are attributed to ethics cafés, e.g., improving analytical skills and communication, increasing ethical sensitivity and authority for making decisions. These characteristics primarily result from theory-based models. Arguments The goal of this study is the empirical investigation of the effectiveness of ethics cafés in the Nursing Homes Mattenhof–Irchelpark, Zurich. Furthermore, the study examined whether the subjective evaluation of characteristics of nurses and other professional groups are different. To capture the characteristics, a questionnaire was constructed in which the participants rated 16 statements during the survey period. A 5-point Likert scale was used for the analysis. One subgroup distinguished between “nursing staff” and “non-nursing staff”. Conclusion The postulated characteristics were confirmed with a very high approval. Therefore, the ethics cafés provide important input which enable the staff to analyze more clearly in difficult situations or to let them decide ethically in a more sensitive manner and to justify decisions made. The interdisciplinary approach supports an understanding of the views and arguments among the various areas and hierarchies. The differences between the two professionals groups are partially highly significant. It can be noted that the assigned characteristics in the questionnaire are generally perceived stronger and more significantly by the nursing staff. Therefore, a distinction must be made when interpreting the results of this study concerning the participants.     

s—d混合效应与s—d系统附加比热

根据Ａｎｄｅｒｓｏｎ Ｍｏｄｅｌ定量地估计了稀磁合金中稀磁合金中有磁解与非磁解的情况下ｓ－ｄ混合效应所引起的杂质电子与传导电子的附加比热。     

[Rh(s,s-chiraphos)]+催化MAC氢化反应中间态的量子化学计算

采用量子化学的ab initio方法，对膦铑络合物[Rh(s，s—chiraphos)]^ 催化甲基-α-乙酰氨基肉桂酸氢化反应的三个中间态的结构进行了优化，其中第一个中间态有同类中间态的X-射线衍射实验数据对照，结构数据符合较好，几个中间态的优化结果均符合此类反应的立体走向特征，说明用量子化学方法实现该类反应中间态结构的优化是方便可行的，优化结果及进一步的计算将会为反应机理研究奠定基础并提供重要信息。     

双环网络G(N;±r,±s)的紧优性

双环网络是计算机互连网络,大规模并行处理系统和通讯系统的一类重要拓扑结构.文中证明了双环网络G(N;±d,±(d 1))是紧优的,其中d=[(√2N-1-1)/2];并给出了G(N;±r,±s)的一些其它紧优多项式无限族.     

在s—d系统中s—d交换效应与准电子

本文利用Ｙｏｓｕｋｅ Ｎａｇａｏｋａ的Ｈａｍｉｌｔｏｎｉａｎ和Ｇｒｅｅｎ函数，定量地讨论了Ｃｕ－Ｍｎ合金（Ｃ＝０．０７５ａｔ％）的ｓ－ｄ交换效应与准电子的反常性质。     

Quantitative analysis of Boehm'''' s GC

The term garbage collection describes the automated process of finding previously allocated memory that is no longer in use in order to make the memory available to satisfy subsequent allocation requests. We have reviewed existing papers and implementations of GC, and especially analyzed Boehm' s C codes, which is a real-time mark-sweep GC running under Linux and ANSI C standard. In this paper, we will quantitatively analyze the performance of different configurations of Boehm' s collector subjected to different workloads. Reported measurements demonstrate that a refined garbage collector is a viable alternative to traditional explicit memory management techniques, even for low-level languages. It is more a trade-off for certain system than an all-ornothing proposition.     

An Inexact Halley＇s Method

An inexact Halley＇s method-Halley-PCG（preconditioned conjugate gradient） method is proposed for solving the systems of linear equations for improved Halley method either by Cholesky factorization exactly or by preconditioned conjugate gradient method approximately. The convergence result is given and the efficiency of the method compared to the improved Halley＇s method is shown.     

ν为偶数时（ν,ν/2＋s）-奇图的计数定理

对任意偶数ν考虑当0≤s≤3时（ν,ν/2＋s）-奇图的计数,结合F.Harary在[5]中列举的有p（1≤p≤6）点图的分解,通过构造一种新的由星图●a1,●a2,…,●am构成的图Ga1,a2,am,利用度序列的不同安排给出了不同构（ν,ν/2＋s）-奇图的计数结果。