用VSM模型探讨MIS的改进

管理信息系统（ＭＩＳ，ＭａｎａｇｅｍｅｎｔＩｎｆｏｒｍａｔｉｏｎＳｙｓｔｅｍ），发展近三十年来在理论及实际应用方面都已取得令人瞩目的成绩，但是它在支持企业各级管理活动方面提供的功能并不令人满意。因此，ＭＩＳ的功能还有待加强，ＭＩＳ的开发工作有待改进。本文对现有ＭＩＳ存在的主要问题进行了探讨，以增强企业的活力为ＭＩＳ改进的目标，依据ＶＳＭ（ＶｉａｂｌｅＳｙｓｔｅｍＭｏｄｅｌ）理论对ＭＩＳ的改进提出一些设想，并分析了这些设想的可行性。     

支持多窗口屏幕的改进型OPS5解释器

ＯＰＳ５是一种专家系统开发工具，我们改进了ＯＰＳ５解释器，使之能支持多窗口屏幕，本文论述了改进型ＯＰＳ５解释器中支持多窗口屏幕的改进方法和实现原理。     

数字蜂房移动通信信道的一种模型

根据数字蜂房移动通信的信号传输过程建立了一种时变的ＦＩＲ信道模型。在此模型基础上，研究了一种新的自适应均衡方法。它基于系统辨识原理，采用改进的归一化变步长最小均方误差（ＭＮＶＳ ＬＭＳ）算法，克服由于多径效应引起的码间干扰（ＩＳＩ）。计算机模拟实验表明，本文提出的ＭＮＶＳ算法其跟踪性能明显优于ＮＶＳ和传统的ＬＭＳ算法，且运算量小，具有良好的实用性。     

交直流掉电预警及过、欠压保护直流在线式UPS电源

提出了一种适用于分布式数据采集和监控系统（ＳＣＡＤＡ）远程智能终端（ＲＴＵ）中的直流在线式ＵＰＳ电源的设计方案，它具有交／直流掉电预警和过、欠压保护功能．论述了其工作原理，对预警电路输入端进行了改进，给出了改进后预警信号产生的原理图．设计电路已应用于水源井微机无线ＳＣＡＤＡ系统中，也适用于其它需要实时数据采集和监控的情况．     

改进的时空守恒元和解元方法

近年来美国ＮＡＳＡ路易斯中心Ｓ．Ｃ．Ｃｈａｎｇ提出了一种全新的时空守恒元和解元方法（ＣＥ／ＳＥ）。与传统的数值方法相比，该方法具有许多独特的优点，如它可以在局部和全局都严格保证其物理意义上的守恒律。但是该方法推广到多维情形（尤其是三维）及更高阶格式时既困难又复杂。为此本文对该方法进行了一些改进，把“ＣＥ／ＳＥ”方法与有限差分法结合起来，由此得到的新格式不仅保留了ＣＥ／ＳＥ方法的优点，而且格式更简单、计算量更小，通用性更好，对激波等间断具有很高的分辨率，同时也很容易推广到高阶格式及多维情形。     

一个小型计算机上的MOS电路分析程序—MDF

本文介绍的是一个小型计算机上的ＭＯＳ集成电路的电路分析程序——ＭＤＦ。用它可进行ＭＯＳ集成电路的直流分析和瞬态分析。它有一个输入语言，用户借助它可直观地描述要分析的电路的拓补结构和元件参数以及输出要求。ＭＤＦ采用了节点法列方程，用隐式变步长的积分技术求解常微分方程组，用改进的牛顿——拉夫森方法及ＬＵ分解求解非线性代数方程组。     

马氏珠母贝外套膜组织培养的条件和方法初探

经过反复试验，筛选出适宜于马氏珠母贝外套组织培养的平衡盐溶液（改进的ＭＭＢＳＳ）、基本培养基；确立了防止污染的组织净化方法，并筛选出一种能促进细胞生长的贴壁物质（ＳＭ）。其主要培养方法为：用合抗生素的改进ＭＭＢＳＳ（青霉素２０００Ｕ／ｍｌ，链霉素２５００Ｕ／ｍｌ）洗涤１０次，再用不含抗生素的改进ＭＭＢＳＳ清洗５次，将组织切成３ｍｍ×３ｍｍ的小块，贴于含０．５％ＳＭ的培养瓶底，加入改进的贝培养基，在２０℃，ｐＨ６．８条件下培养。经这种条件和方法培养的马氏珠母贝外套膜组织，４小时细胞开始游离，３天游离出来的细胞铺满瓶底，４天细胞分泌珍珠质．培养７天大量的成纤维细胞出现，细胞培养能持续数十天。     

热应变对金属基复合材料Bauchinger效应的影响

利用作者改进的等效夹杂理论研究了晶须增强金属基复合材料的Ｂａｕｃｈｉｎｇｅｒ效应，讨论了热残余应变和加载次序对它的影响。研制了ＳｉＣｗ／Ａｌ复合材料，并对其拉、压破坏的断口进行了ＳＥＭ观察     

一个小型机上的通用电路分析程序-GCAPN

众所周知，电路分析技术是电路设计师强有力的工具，在小型机上实现电路分析程序将更有利于它的广泛应用。本文介绍的 ＧＣＡＰＮ是运行在具有磁盘操作系统 ＲＤＯＳ的ＤＪＳ—１３０机（或ＮＯＶＡ机）上的通用电路分析程序，该机具有３２Ｋ内存，字长为１６位。 ＧＣＡＰＮ有一个直观易学的输入语言，采用了“改进节点法”建立电路方程，应用稀疏矩阵技术和隐式变步长的积分方法来求解方程组。程序中对“改进节点法”作了若干改进，并采用了适于小型机特点的数据结构和软件技术。另外，程序中还备有ＭＯＳ和双极型晶体管的模型。用ＧＣＡＰＮ可以进行直流、交流和瞬态分析     

一类含有稳定参数的Gear型隐式方式

本文导出解ｓｔｉｆｆ方程的一类含有稳定参数Ｓ的Ｋ步Ｋ阶的ｓｔｉｆｆ稳定的Ｇｅａｒ型隐式方法，我们可以通过适当选取参数Ｓ，改进其绝对稳定性。保证零稳定和无穷远稳定．它比相应的Ｇｅａｒ方法［１］。变更的Ｇｅａｒ方法［３］和Ｅｎｒｉｇｈｔ方法［２］有更大的绝对稳定域，并且构造方便，计算简单。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the