磁场处理水用于锅炉和冷却水处理

本文从理论和实践上综述了磁化水的特性、磁化机理、国内外的发展近况及其使用安装等。该法用于锅炉和各类冷却水处理有广泛的前景。     

简易高性能纳秒脉冲发生器

为了实现电子散射飞行时间谱仪电子束的脉冲化及产生时一幅变换器的启动或停止信号。我们利用开关晶体管的雪崩特性研制了一个性能好，成本低的纳秒脉冲发生器。该发生器输出上升时间好于Ｉｎｓ，幅度达１０Ｖ的负尖脉冲，用作时一幅变换器的启动或停止信号；也输出上升时间约３ｎｓ，幅度５－３０Ｖ连续可调和宽度５－２３０ｎｓ可调的正脉冲，用作电子束脉冲化的调制信号，脉冲重复率为１５０×１０＾３ｓ＾－１。它可广泛用于类似     

饱和软土天然含水量估算指标及ω一e回归方程的建立

天然含水量ω是土的最基本物理量指标之一。采用数理统计方法，建立经验方程来修正土的天然含水量ω的测定值，使修正后的天然含水量数值与实际中的真值符合程度更为接近，效果甚好。     

GaAs器件工艺中等离子刻蚀及计算机辅助监控技术研究

用Ｎ２气和ＮＦ３反应气体，在较低的刻蚀功率下实现了用薄正性光刻胶ＡＺ１５１８作掩模，均匀、快速刻蚀ＳｉＯ２，ＳｉＯＮ，Ｓｉ３Ｎ４，ＷＮ，Ｗ等材料的等离子刻蚀技术。利用到蚀过程中射频参数的变化和计算机技术，将射频参数的变化在计算机屏幕上实时显示，实现了计算机辅助监控和终点检测技术。     

Techniques for estimating test length under random test

When a circuit is tested using random or pseudorandom patterns, it is essential to determine the amount of time (test length) required to test it adequately. We present a methodology for predicting different statistics of random pattern test length. While earlier methods allowed estimation only of upper bounds of test length and only for exhaustive fault coverage, the technique presented here is capable of providing estimates of all statistics of interest (including expected value and variance) for all coverage specifications.Our methodology is based on sampling models developed for fault coverage estimation [1]. Test length is viewed as awaiting time on fault coverage. Based on this relation we derive the distribution of test length as a function of fault coverage. Methods of approximating expected value and variance of test length are presented. Accuracy of these approximations can be controlled by the user. A practical technique for predicting expected test length is developed. This technique is based on clustering faults into equal detectability subsets. A simple and effective algorithm for fault clustering is also presented. The sampling model is applied to each cluster independently and the results are then aggregated to yield test lengths for the whole circuit. Results of experiments with several circuits (both ISCAS '85 benchmarks and other practical circuits) are also provided.This work was done while the author was with the Department of Electrical Engineering, Southern Illinois University, Carbondale, IL 62901.     

攀钢高炉焖砂口试验

分析了高炉冶练钒钛磁铁矿炉前砂口损坏的原因。对新型砂口泥进研制，同时改进了套砂口工艺，满足了攀钢高炉焖砂口的需要。攀钢高炉采用闷砂口工艺后，从根本上解决了铁水带渣问题，提高了铁水的洁净度。     

Simulation of water and nitrogen dynamics in soils during wastewater applications by using a finite-element model

A mathematical model was developed to simulate water movement, mass transport, and nitrogen transformations in soils during wastewater applications. The model is one-dimensional and based on the Galerkin finite-element method. The submodel of mass transport of nitrogen incorporates the convection-dispersion processes of ammonium and nitrate nitrogen, nitrification, denitrification, ammonium exchange and uptake of ammonium and nitrate ions. The accuracy and validity of the proposed model was examined by comparison with an explicit-implicit finite-difference model results. The model was used for simulation of water and nitrogen dynamics during wastewater application in homogeneous and multi-layered soils under different N concentration, rate, duration and scheduling of application.     

大口径管道带水抢修

包头地区1996年5月3日发生6.4级强烈地震,给包钢生产造成重大损失,地震发生后,包钢生产用动力系统发生多起事故.本文针对4#高炉工业回水管道(φ1220×10)震后发生断裂,如何在保证不停止生产的前提下,采取什么措施进行管道带水抢修进行了阐述,本文是经过现场抢修过程总结而来,对今后大口径管道带水抢修提供了宝贵的经验.     

黑土土壤质量演变初探I：不同开垦年限黑土主要质量指标演变规律

根据土壤质量的定义和研究方法 ,对黑土的主要质量指标演变规律进行初步研究。结果表明 :黑土的颗粒组成受开垦历史影响的程度较小 ,其质地没有发生显著变化 ;黑土的有机质、全氮、全硫和全磷随着黑土开垦时间的增加而不断降低 ;速效磷随黑土开垦时间的增加有增高的趋势。经过统计分析 ,黑土中粉砂(0.05～0.002mm)含量与细砂(0.25～0.05mm)和粘粒(<0.002mm)含量具有相关性,黑土有机质含量与全氮、全硫、全磷和速效钾具有明显的正相关。因此 ,初步认为黑土中粉粒和有机质含量可以作为土壤物理和养分方面的质量指标     

Predicting posttraumatic growth in breast cancer survivors.

Wide variability exists with respect to how breast cancer survivors respond to common psychological and psychosocial challenges of their disease, ranging from posttraumatic stress disorder to posttraumatic growth. This cross-sectional study examined contextual, disease-related, and intraindividual predictors of posttraumatic growth in 224 randomly selected breast cancer survivors. A series of hierarchical regression analyses found that age at diagnosis, marital status, employment, education, perceived intensity of disease, and active coping accounted for 34%, 35%, and 28% of the variance in growth in relationships with others, new possibilities, and appreciation for life. These findings suggest that a more comprehensive model of growth will be helpful in understanding the various factors that play a role in breast cancer survivors' perception of psychological and psychosocial growth. (PsycINFO Database Record (c) 2010 APA, all rights reserved)