舰船用断路器抗冲击欠压脱扣器的设计

对断路器的欠压脱扣器结构进行分析和研究 ,采用平衡机构、弹性球效应等抗冲击设计方法 ,并通过理论计算和验证 ,将H—DW14舰船用断路器的欠压脱扣器设计成具有抗冲击能力的产品 ,以适应舰船的要求。     

PVA平均聚合度波动因素分析及优化控制

针对聚乙烯醇 (PVA)聚合反应过程中 ,平均聚合度波动的实际问题 ,在对聚合反应工艺、反应机理进行理论分析的基础上 ,找出了影响平均聚合度波动的主要因素 ,并逐一分析了对平均聚合度影响的情况 ,在理论和实验基础上找出了在多品种PVA生产中各主要因素变化对平均聚合度变化的规律 ,提出了包括运用先进仪表控制手段在内的优化控制措施和处理办法     

A method for quantifying cell size from differential interference contrast images: validation and application to osmotically stressed chondrocytes

An automatic image analysis method was developed to determine the shape and size of spheroidal cells from a time series of differential interference contrast (DIC) images. The program incorporates an edge detection algorithm and dynamic programming for edge linking. To assess the accuracy and working range of the method, results from DIC images of different focal planes and resolutions were compared to confocal images in which the cell membrane was fluorescently labelled. The results indicate that a 1‐µm focal drift from the in‐focus plane can lead to an overestimation of cell volume up to 14.1%, mostly due to shadowing effects of DIC microscopy. DIC images allow for accurate measurements when the focal plane lies in a zone slightly above the centre of a spherical cell. In this range the method performs with 1.9% overall volume error without taking into account the error introduced by the representation of the cell as a sphere. As a test case, the method was applied to quantify volume changes due to acute changes of osmotic stress.     

曙—区超稠油间歇蒸汽吞吐技术探讨

针对曙-区超稠油井进入高周期后产量递减，成本上升的矛盾，提出用间歇吞吐技术改善高周期蒸汽吞吐效果，通过对吞吐机理和现场实际资料统计的分析。对这项技术实施的条件及效果进行了探讨。结果表明，该项技术在高周期井实施效果较好。具有较好的推广前景。     

井眼剪切带分叉研究

井眼基本破坏形式是由于不稳定性造成的井眼岩石崩落坍塌和剪切带。井眼破坏的非均匀性采用传统的理论和方法不能得到较好的解释和预测。采用材料的分叉分析方法和变形局部化的数值模拟研究 ,可望对井眼失效的机理分析、预测和控制提供新的思路     

离心式空气压缩机喘振原因分析

离心式空气压缩机运行效率较高 ,故障率低 ,不宜发生喘振。因此 ,一旦发生喘振 ,其原因查找更加困难。必须了解压缩机的工作原理、控制方式、掌握各部件性能 ,认真检查各部件是否运行完好 ,才能排除故障     

斜井提升钢丝绳磨损“失效树”分析

介绍了引起斜井提升钢丝绳失效的各种因素 ,并建立“失效树” ,为煤矿生产中判断其失效原因及预防提供可靠依据。     

水利工程排涝减灾效益分析与计算

在分析涝灾成因特点基础上对涝灾进行了重新定义，在研究涝灾损失及 排涝效益时引入了临界降雨量的概念，从而奠定了水利工程排涝减灾效益分析与计算的理论基础，并给了效益计算的一般计算模型。     

An algorithm to solve transient structural non-linear problems for non-matching time-space domains

This paper presents a new transient algorithm to couple sub-domains having non-matching time and space interfaces. The time integrators in each of the sub-domains are of the Newmark family but can be different. The method is also developed for non-linear explicit transient computations for which the time steps are not constant. A number of examples are presented which illustrate the interest, quality and the efficiency of the proposed method.     

挤压六通管及其连接结构的安全性研究

六通管是石油化工设备及压力管道中的重要元件,传统的制作及连接方法是在集流管上开孔,然后将支管插入并焊接而成或采用锻制的方法制成。采用挤压的方法制作六通管,将其与支管对接焊接。并通过试验及数值模拟对该结构的安全性进行了研究,实践证明,这种挤压六通管的强度性能优于普通的焊接六通管,可以广泛应用于工业生产。