A programmable approach to maintenance of a finite knowledge base

In this paper,we present a programmable method of revising a finite clause set.We first present a procedure whose formal parameters are a consistent clause set Γand a clause A and whose output is a set of minimal subsets of Γwhich are inconsistent with A.The maximal consistent subsets can be generated from all minimal inconsistent subsets.We develop a prototype system based on the above procedure,and discuss the implementation of knowledge base maintenance.At last,we compare the approach presented in this paper with other related approaches,The main characteristic of the approach is that it can be implemented by a computer program.     

基于案例推理和多策略相似性检索的中医处方自动生成*

以新安医学防治中风病中新安医家的诊疗医案和方药为研究对象, 采用多策略相似性检索技术实现中医辨证,以基于案例推理的智能决策技术实现中医处方用药的自动化。该设计过程符合医学诊断的实际过程,现实、可行,有助于提高医师诊断过程的自动化水平,有助于中医研究的信息化、智能化和现代化。     

14MnVTiReA钢应变时效性能研究

研究了０～１０％的应变时效对１４ＭｎＶＴｉＲｅＡ钢薄板的强度、塑性及低温韧性和脆性转变温度的影响，结果表明，１４ＭｎＶＴｉＲｅＡ钢薄板的应变时效敏感性较低，时效后仍具有较好的韧性和止裂能力，可满足产品无限航区的使用要求。     

汇率风险对中国石化海外投资的影响分析及对策

汇率风险主要指外汇汇兑损益。企业汇兑损益产生的原因包括现汇兑换损益和账务核算汇兑损益,按币种结构可分为国际主要自由兑换货币之间、当地币与国际主要自由兑换货币之间和人民币与国际主要自由兑换货币之间三类。中国石化的海外投资业务规模不断扩大,境外投资、境外工程承包和贸易等不同业务都会面临汇率风险。深入探讨规避或减少汇兑损失的对策与方法具有非常的意义和作用。     

Effect of silica sintering additive on the sintering behavior and dielectric properties of strontium barium niobate ceramics

Sr_0.5Ba_0.5Nb₂O₆ powders were prepared in the partial coprecipitation method. Using amorphous SiO₂ as the sintering additive, Sr_0.5Ba_0.5Nb₂O₆ ceramics were sintered at different temperatures and the effects of the additive on the sintering behaviors and dielectric properties were studied. The phase structure, microstructure and dielectric properties of the samples were investigated in X-ray diffraction (XRD), SEM and LCR analyzer respectively. The results indicated that the amorphous SiO₂ additive could accelerate the pore elimination, shorten the sintering time and enhance the density for Sr_0.5Ba_0.5Nb₂O₆ ceramics. The well development of microstructure promoted by the additives can result in the improvement of the dielectric constant and the weakening of the relax behavior. With the help of the additive of 1.5 wt.%, the relative density of the sample sintered at 1300 °C only for 2 h can reached 94.3% and the dielectric constant was up to 4322.     

RPR-一种新兴的城域传输和接入环技术

弹性分组数据环(RPR)是一种新的数据通讯网络技术.2000年12月成立的IEEE802.17工作组作为开发BPR标准的权威机构,在过去的两年半里取得了很大的进展,目前已经有超过90家公司加入该RPR工作组.在2003年6月,该工作组发布了RPR草案2.3版.     

油压机成形加工自动循环

一台四立柱油压机,经过简单改进,可以实现冲压成形加工动作顺序的自动循环。     

一种新的同步时序信号电路的原理及应用

介绍了一种能同时发出１￣１６条或更多的同步时序信号的新的电路。并结合该电路在微机系统应用的实例，介绍了其设计原理。     

优选法在电极糊配方中的应用

本文将优选法运用在电极糊配比试验中，通过工业中应用取得了令人满意的结果。     

测边网中加测陀螺边的精度探讨

本文通过对几个具有代表性的测边网加测陀螺边的模拟计算,得出了网中陀螺边的变化对平差后各种控制网元素的影响规律,为网的最优化设计提供了必要的数字依据。