高压锅炉用无缝钢管标准述评

对比了国内外7个高压锅炉用无缝钢管标准的各项技术指标,分析了其技术指标差距,简述了产生差距的原因。对如何缩小差距提出了建议。     

综合单价法投标报价

介绍了工程量清单进行综合单价法投标报价是工程造价计价方法的一项改革，它真正做到了公平合理，量价分离，提出了施工企业只有不断地采用先进的施工技术和科学的经营管理，在统一计价规则的指导下编制先进的企业内部定额，才能适应市场的激烈竞争。     

严格正实引理和严格界实引理的一般描述——非最小实现的情形

本文对于非最小实现的情形研究了严格正实引理和严格界实引理。采用H_∞范数给出了二者的一般描述。其结果可以使人们更清楚地了解严格正实系统和严格界实系统的结构。     

An optimal fuel-injection policy for performance enhancement in internal combustion engines

A fuel-injection internal combustion engine system is considered, wherein supply of fuel to the engine is controlled with the twin purposes of maximizing power output and minimizing fuel wastage. The system is modelled as a controlled Markov chain and a feed-back optimal control policy is obtained for the long-run average reward optimality criterion using Markov decision theory.     

酮在草酸钠水溶液中的无限稀释活度系数

运用汽提法测定了298.15K温度条件下三种酮:丙酮、丁酮和3-戊酮在草酸钠水溶液中的无限稀释活度系数,其对数lnγ~∞与草酸钠浓度存在良好的线性关系。     

线性矩阵方程(ATXA,BTXB)=(C,D) 的反对称解

利用矩阵对[A，B]的商奇异值分解(QSVD)，建立了线性矩阵方程(A^TXA，B^TXB)=(C，D)反对称解存在的充分必要条件，并给出了通解的表达式，同时导出了此方程的最小二乘反对称解的表达式。     

Hankel norm approximation for well-posed linear systems

The sub-optimal Hankel norm approximation problem is solved for a well-posed linear system with generating operators (A,B,C) and transfer function G satisfying some mild assumptions. In the special case of the sub-optimal Nehari problem, an explicit parameterization of all solutions is obtained in terms of the system parameters A, B, C and G(0).     

半无限弹性地基上任意形状弹性基础板的有限元分析

本文将任意四边形板单元的协调位移模式应用于半无限弹性地基上任意形状弹性地基板分析。文章提出了相应的高斯积分术解法,通过求解地基的柔度矩陈,根据地基与板之间的位移协调及静力平衡条件建立了以板的位移为未知量的有限元方程,并给出两算例。     

新时期制定企业标准的新观念

本文从一般意义上并结合企业现阶段实际情况，阐述了制定企业标准的一些新的观念和思想，推进企业技术进步，产品质量上等级。     

On stability and solvability (or,when does a neural network solve a problem?)

The importance of the Stability Problem in neurocomputing is discussed, as well as the need for the study of infinite networks. Stability must be the key ingredient in the solution of a problem by a neural network without external intervention. Infinite discrete networks seem to be the proper objects of study for a theory of neural computability which aims at characterizing problems solvable, in principle, by a neural network. Precise definitions of such problems and their solutions are given. Some consequences are explored, in particular, the neural unsolvability of the Stability Problem for neural networks.