医疗器械质量体系专用要求

医疗器械和药品相似,其质量直接关系到人体自身的安全和健康。因而,其安全和有效受到全社会的普遍关注。国际标准化组织（ＩＳＯ）于１９９４年１０月专门成立了“医疗器械质量管理和通用要求技术委员会”（ＩＳＯ／ＴＣ２１０）,下设四个工作组分别承担有关医疗器械质量管理国际标准的起草工作：ＩＳＯ／ＴＣ２１０／ＷＧ１　医疗器械质量体系ＩＳＯ／ＴＣ２１０／ＷＧ２　医疗器械质量原则应用中的通用要求ＩＳＯ／ＴＣ２１０／ＷＧ３　医疗器械符号,定义和术语ＩＳＯ／ＴＣ２１０／ＷＧ４　医疗器械风险管理国际标准化组织于１９９６…     

TGSQL：一个时态查询语言

建立了一个基于间断区间的时态查询语言ＴＧＳＱＬ。它是ＳＱＬ的一个扩展，且是基于１ＮＦ的。由于ＴＧＳＱＬ仅在ＳＱＬ上增加一个ＷＨＥＮ子句，它既继承了ＳＱＬ的原有功能，又增加了操作时间的功能。     

掺Si对MOCVD生长的GaN单晶膜的黄带发射及生长速率的影响

对ＭＯＣＶＤ生长ＧａＮ：Ｓｉ薄膜进行了研究,研究表明随ＳｉＨ４／ＴＭＧａ流量比增大,ＧａＮ：Ｓｉ单晶膜的电子浓度增大,迁移率下降,Ｘ射线双晶衍射峰半高宽增加,同时这发射强度得到了大大的提高,并报导了随ＳｉＨ４／ＴＭＧａ流量比增大,ＧａＮ：Ｓｉ的生长速率降低的现象,研究结果还表明,预反应对ＧａＮ：Ｓｉ单晶膜黄带发射影响很大,预反应的减小可以使黄带受到抑制。     

TEOS-PEG无机-有机杂化复合材料的研究

阐述了溶胶凝胶法合成ＴＥＯＳＰＥＧ（正硅酸乙酯聚乙二醇）无机有机杂化复合材料的基本原理,且成功地合成出该材料,同时进行了红外表征及热分析,探索了ＴＥＯＳＰＥＧ凝胶比表面积、折射率及结构的影响因素。ＴＥＯＳＰＥＧ无机有机杂化复合材料具有优良的物化性能及光学性能,可广泛用作各种特殊用途的光学元件。     

TEOS—PEG无机—有机杂化复合材料的研究

阐述了溶胶－凝胶法合成ＴＥＯＳ－ＰＥＧ无机－有机杂化复合材料的基本原理,且成功地合成出该材料,同时材料了红有征及热分析,探索了ＴＥＯＳ－ＰＥＧ凝胶比表面积、折射率及结构的影响因素,ＴＥＯＳ－ＰＥＧ无机－有机杂化复合材料具有优良的物化性能及光学性能,可广泛用作各种特殊用途的光学元件。     

新型柯达GOLDG系列胶片

新型柯达ＧＯＬＤＧ系列胶片新型柯达ＧｏｌｄＧ系列胶片有ＩＳＯ１００～８００四种速度，分别为ＧｏｌｄＧＡＩＳＯ１００，ＧｏｌｄＧＢＩＳＯ２００，ＧｏｌｄＧＣＩＳＯ４００和ＧｏｌｄＧＴＩＳＯ８００。在欧洲，ＧｏｌｄＧＣ４００叫做Ｕｌ－ｔｒａ４００，ＧＴ８...     

CuO－SnO_2纳米晶粉料的Sol－Gel制备及表征

不用金属醇盐而以无机盐为起始物质，采用Ｓｏｌ－Ｇｅｋ法得到了平均晶粒尺寸为２１～２２ｎｍ，ＣｕＯ掺杂的ＳｎＯ_２粉料；运用Ｘ射线衍射（ＸＲＤ）、差热—失重分析（ＤＴＡ－ＴＧ）、透射电镜（ＴＥＭ）及ＢＥＴ比表面（ＳＡ）测定等分析手段对粉料进行了表征．实验表明，ＣｕＯ的掺杂抑制了ＳｎＯ_２晶粒的生长；以无机盐为原料，采用Ｓｏｌ－Ｇｅｌ法制取ＳｎＯ_２（ＣｕＯ）纳米级晶料是切实可行的，将有利于产业化．     

CuO—SnO2纳米晶粉料的Sol—Gel制备及表征

不用金属醇盐而以无起始物质，采用Ｓｏｌ－Ｇｅｋ法得到了平均晶粒尺寸为２１－２２ｎｍＣｕＯ掺杂的ＳｎＯ２粉料；运用Ｘ射线衍射（ＸＲＤ），差热－失重分析（ＤＴＡ－ＴＧ），透射电镜（ＴＥＭ）及ＢＥＴ比表面（ＳＡ）测定等分析手段对粉料进行了表征，实验表明，ＣｕＯ的掺杂抑制了ＳｎＯ２晶粒的生长，以无机盐为原料，采用Ｓｏｌ－Ｇｅｌ法制取ＳｎＯ２（ＣｕＯ）纳米级晶料是切实可行的，将有利于产业化。     

调音台操作术语英汉对照（三）

调音台操作术语英汉对照（三）冯杰ＳＩＧＮＡＬＰＲＯＣＥＳＳＯＲ：信号处理器ＥＱＵＡＬＩＺＥＲ：均衡器ＳＵＭ：总输出编组开关ＬＯＷＣＵＴ：低频切除开关ＨＩＧＨＣＵＴ：高频切除开关ＰＨＯＮＯＩＮＰＵＴ：唱机输入ＳＴＥＲＥＯＯＵＴ：立体声输出ＡＣＴＩＶＩＴ...     

PPS／PA－66共混物热行为的研究

利用差示扫描量热（ＤＳＣ）、热失重（ＴＧ）和微分热失重（ＤＴＧ）研究了ＰＰＳ／ＰＡ－６６共混物的热行为和降解过程。实验结果表明，共混物具有双熔融行为，在７００℃以下为二步降解     

铜合金在舰船上的应用

概述了造船用铜合金的开发和应用,包括螺旋桨用铜合金、冷凝管用铜合金、通海系统用铜合金等。展望了铜合金在未来舰船上的应用前景。     

GT cell formation for minimizing the intercell parts flow

A methodology is proposed to design a GT cell by considering the intercell parts flow in GT cellular manufacturing systems. The problem of GT cell formation is described in a graph using the quantities to be produced in the specified time period and the process routes for producing the products. The objective of this paper is to minimize the total number of parts produced in more than one cell. The problem, formulated as a quadratic assignment problem (QAP), is solved using both Lagrangean relaxation technique and the optimality conditions of quadratic program. Furthermore, in order to obtain the giobal optimal solution rather than the local optimal solution, a branch-and-bound algorithm is employed. Finally, numerical examples are used to show the effectiveness of the solution techniques and GT cell formation procedure. Moreover, a computer simulation is presented, showing the effectiveness of cellular manufacturing systems     

Fractional cell formation in group technology

Group Technology (GT) aims at improving productivity in batch manufacturing. Here components are divided into families and machines into cells such that every component in a part family visits maximum number of machines in the assigned cell with an objective of minimizing inter-cell movement. In situations where too many inter-cell moves exist, fractional cell formation using remainder cells can be used. Here, machines are grouped into GT cells and a remainder cell, which functions like a job shop. Component families are formed such that the components visit the assigned cell and the remainder cell and do not visit other cells. The fractional cell formation problem to minimise inter-cell moves is formulated as a linear integer programming problem. Here, movement between machine cells and remainder cells is not counted as inter-cell moves but movement of components among GT cells is considered as inter-cell movement. The fractional cell formation problem is solved using Simulated Annealing. A heuristic algorithm is developed to solve large sized GT matrices. These have applied to a variety of matrices from GT literature and tested on randomly generated matrices. Computational experiences with the algorithms are presented     

海洋工程时代我国船舶工业发展建议研究

本文对我国船舶工业在海洋工程时代所面临的发展机遇进行了分析,并针对我国船舶工业的具体现状提出了相关的对策和建议。     

Fabrication of novel nanofiber scaffolds from gum tragacanth/poly(vinyl alcohol) for wound dressing application: In vitro evaluation and antibacterial properties

Gum tragacanth (GT) is one of the most widely used natural gums which has found applications in many areas because of its attractive features such as biodegradability, nontoxic nature, natural availability, higher resistance to microbial attacks and long shelf-life properties. GT and poly(vinyl alcohol) (PVA) were dissolved in deionized water in different ratios i.e., 0/100, 30/70, 60/40, 50/50, 40/60, 70/30, 0/100 mass ratio of GT/PVA. Nanofibers were produced from these solutions using electrospinning technique. The effect of different electrospinning parameters such as extrusion rate of polymer solutions, solution concentration, electrode spacing distance and applied voltage on the morphology of nanofibers was examined. The antibacterial activity of nanofibers and GT solution against Staphylococcus aureus and Pseudomonas aeruginosa was examined and these nanofibers showed good antibacterial property against Gram-negative bacteria. FTIR data showed that these two polymers may be having hydrogen bonding interactions. DSC data revealed that the exothermic peak at about 194 °C for PVA shifted to a lower temperature in GT/PVA blend. Human fibroblast cells adhered and proliferated well on the GT/PVA nanofiber scaffolds. MTT assay was carried out on the GT/PVA nanofiber to investigate the proliferation rate of fibroblast cells on the scaffolds.     

舰船用高技术新材料的发展

现代科学技术的发展使舰船装备的面貌产生深刻的变化,而高技术新材料又是舰船装备现代化的物质基础,因而在舰船材料的研究与开发中占有很重要的位置。本文综合评述舰船用新型结构材料（新金属结构材料、先进树脂基复合材料、结构陶瓷材料和高温结构材料）和先进功能材料（隐身材料、减振与消声材料、水声换能材料、超导材料、贮氢材料和永磁材料）的发展和应用趋势,并对我国舰船新材料的发展提出意见和建议。     

Group technology in the US manufacturing industry: A survey of current practices

This paper reports the findings of a survey of 53 US users of group technology (GT). Respondent installations were medium to large electronics and metalworking manufacturers. They engaged predominantly in fabrication activities, producing a large number of component parts and/or end items. These firms applied GT to design, process planning (including NC programming), sales, purchasing, cost estimation, tooling, scheduling, new equipment sizing, and tool selection. In the majority of cases, firms used classification and coding systems as tools in applying GT. While users identified managerial and technical barriers which must be overcome in successfully applying GT, significant and varied operational and strategic benefits had been achieved. Further, most felt that GT would be an integral and important part of future CAD/CAM activities at their plant. The respondents' experiences confirm that GT's usefulness is quite broad and suggest that failure to understand GT as a general philosophy and, instead, to consider it a tool or equate it with a specific use, may result in lost opportunities to improve manufacturing productivity. A second paper, based on the same survey data, describes these manufacturers' experiences with cellular manufacturing (Wemmerlov and Hyer 1989).     

成组生产管理系统

根据成组技术的生产特点和6502厂的生产经营条件,本文阐述了6502厂成组生产管理系统的构成,行运和功能,提出了若干实施成组技术的生产管理思想。     

Surface Tension of Binary Mixtures Including Polar Components Modeled by the Density Gradient Theory Combined with the PC-SAFT Equation of State

In this study, the Cahn–Hilliard density gradient theory (GT) is used for predicting the surface tension of various binary mixtures at relatively wide temperature ranges and for testing the application of the GT for predictions of homogeneous nucleation. The GT was combined with two physically based equations of state (EoS), namely the perturbed-chain (PC) statistical associating fluid theory (SAFT) and its modification for polar substances the perturbed-chain polar (PCP) SAFT. The GT applied to the planar phase interface was employed to predict the interfacial tension for various quadrupolar (CO₂ and benzene) and dipolar (difluoromethane, i.e., R32; pentafluoroethane, i.e., R125; and 1,1,1,2-tetrafluoroethane, i.e., R134a) substances and for five binary mixtures including polar components (n-decane + CO₂, benzene + CO₂, R32 + R125, R32 + R134a, R134a + R125). The PCP-SAFT EoS combined with the GT provides more accurate results for both the quadrupolar and dipolar substances than the original PC-SAFT EoS. Besides the planar phase interface, the GT was also applied to the spherical phase interface simulating a critical cluster occurring in homogeneous nucleation of droplets. Carbon dioxide was considered, because it has a relatively high quadrupole moment and because of its relevance to natural gas processing. Application of the PCP-SAFT EoS provides a significant improvement compared to the PC-SAFT EoS, and it is clearly superior to the classical cubic Peng–Robinson EoS, which is still used for modeling droplet nucleation.     

专项生产模式下基于成组技术的制造系统集成

主要研究了专项生产方式下以成组技术为基础的CIMS集成方法，包括面向CIMS的集成的成组信息编码，基于成组编码的CAD／CAE／PDM集成，CAPP／PDM集成和PDM／ERP集成，提出了基于成组技术的CIMS集成框架，研究了贯穿于CAD，CAE，CAPP，PDM与ERT系统的统一的成组编码方案和信息编码方案，这种集成方法的研究对于推动CIMS和并行工程在专项生产企业的应用具有重要意义。