Using MR elastography to image the 3D force chain structure of a quasi-static granular assembly

We have developed a magnetic resonance elastography (MRE) technique to experimentally investigate the force chain structure within a densely packed 3D granular assembly. MRE is an MRI technique whereby small periodic displacements within an elastic material are measured. We verified our MRE technique using a gel phantom and then extended the method to image the force carrying chain structure within a 3D granular assembly of particles under an initial pre-stressed condition, on top of which is superimposed a small-amplitude vibration. We find that significant coherent displacements form along force chains, where spin phase accumulates preferentially, allowing visualization. This work represents the first time that the internal force chain structure of a dry assembly of granular solids has been fully acquired in three dimensions.     

小型供电企业图文档管理系统

本文介绍了小型供电企业实施图文档管理系统的必要性,设计了一套多层架构的图文档管理系统,并介绍了该系统的组成及主要功能。在杭州城北供电局、城西供电局的应用中表明,该系统具有较强的实用价值。     

英文文献自动摘要系统的研制与开发

采用仿人算法对英文文献自动摘要系统进行了研究，并介绍了该系统的体系结构、主要构成、设计思想及基本原理。     

三牙轮钻头设计制造过程的集成数据管理平台

结合三牙轮钻头的设计制造过程，介绍了江汉钻头厂JZ－CIMS重点应用工程中的技术文档管理系统的结构和功能，以此作为集成数据管理平台，实现了JZ－CIMS中工程设计与制造分系统（ED＆M）的集成。     

索引时间戳：一种高效的文本索引系统设计方法

特征文件索引、时间戳排序技术是数据库技术研究方面的两个重要课题，前者通常用于支持文本数据的索引和检索操作，后者为实现数据库并发控制的两个基本方法之一。本文主要讨论面向文本数据库管理系统（ＦＩＭＳ）基于索引时间戳概念的文本对象索引模型的形式化描述、检索相关性计算及特征文件系统逻辑设计等问题。     

强化常规水处理工艺对降低水的致突变率的影响

本文利用一些研究者的试验资料论证了通过强化常规水处理工艺 ,降低水的TOC ,Euv ,CODMn和降低水的致突变率MR的正相关关系 ,并建议水厂生产中将TOC、Euv、CODMn列入常规水质检测工作 ,指导生产     

基于磁流变阻尼器的结构振动优化控制

磁流变（MR）阻尼器利用MR流提供可控性是当今最新的半主动控制装置，工程应用前景十分广阔，但由于MR阻尼器所固有的高度非线性动特性，使得描述其阻尼力-输入电压关系的逆向动特性的数学模型很难得到，而逆向动特性模型对实现整个控制策略又是至关重要的。本项研究针对这一问题提出运用神经网络技术建立MR阻尼器的神经网络模型来模拟其逆向动特性，并设计与之相适应的控制系统，建立起基于MR阻尼器的结构振动控制的有效分析方法，通过数值仿真结果探讨所提出的结构控制策略的有效性。     

基于环的大容量可扩展分组交换网络结构

提出了一种新型分组交换网络拓扑结构——MR（Magic Ring）网络．在继承传统三级间接连接网络良好性能的基础上，通过在中间级引入环网络，解决了现有大容量分组交换网络无法兼顾良好性能和可扩展性的问题，理论分析和仿真结果表明该网络具有良好的性能和可扩展性．     

设计文件标准化质量之提高

设计文件的标准化质量对企业的经营质量有直接影响。分析了设计文件产生质量问题的主要原因及提高质量的相应措施，这些措施已在实际工作中实施并取得了理想的结果。     

Linking microcomputers and dedicated word processing systems for increased productivity

With the decline in cost of hardware, more and more professionals are acquiring personal computers at their desk. Most common uses of these office computers are word processing and spreadsheet (e.g. LOTUS 123, MULTIMATE, FRAMEWORK, etc.¹) applications. Professionals typically generate text directly on the personal computer (in lieu of hand written copy) and use spreadsheet programs to tabulate and analyze collected field data. A problem in some offices is integrating text and data prepared on the personal computer with existing dedicated word processing systems which have existed in many office environments for some time. One solution is to have the text and tabulated data retyped into the word processing system, however, this approach is not an effective use of resources.

The Industrial Hygiene Section, Industrywide Studies Branch (DSHEFS), NIOSH has developed procedures for electronically linking personal microcomputers with an office-wide word processing system. Using a commercially available hardware “board” (which may be inserted into an open slot in an IBM-PC or compatible), the rough copy report and tabulated spreadsheet data can be electronically linked and “uploaded” from a microcomputer to the word processing system. At NIOSH, a WANG word processing system is the office-wide system for preparing and publishing final reports. This system is not readily compatible with IBM-PC (or similar) microcomputers; however, using MULTIMATE (a commercially available word processing program) and the hardware board, documents can be readily transferred to the WANG virtually unchanged from the copy generated on the microcomputer. Importantly, spreadsheet data can be similarly transferred and linked to a document on the WANG wordprocessing system.

This paper describes the sequence of steps, along with necessary hardware and software, to achieve the integration of written documents and numerical data (analyzed by LOTUS 123) from a microcomputer to a office-wide WANG word processing system.