分布式证书系统的研究与实现

分析了Ｉｎｔｅｒｎｅｔ信息安全的特点,对比借鉴目前国际上几种主要的证书系统,提出了一种分布式的证书系统模型和实现方案。     

企业经营机制目标模式的构造及实现

本文根据我国经济体制改革总体规划要求,适应有计划商品经济的发展,遵循企业经营的系统原理,从动力机制、压力机制、约束机制及协调机制等方面构造了企业经营机制的目标模式,并根据我国现阶段经济体制改革的方向和重点,提出了若干具有一定理论与现实意义的实现措施。     

粉煤灰贮存库气化装置存在问题及对策

描述了大唐国际陡河发电厂粉煤灰贮存库运行过程中出现出灰口下灰慢及气管中堵灰现象,清理灰库后发现气化板损坏、气化槽箱体内全部充满灰、分支进气管弯头磨漏、气化槽箱体安装工艺缺陷及原设计等问题,并对上述问题进行了分析,提出了解决问题的对策。通过对策实施,灰库气化装置运行效果良好,装灰速度提高了4.3~5.7倍。     

氧化混凝法处理苎麻脱胶煮炼废水的试验研究

探讨了以Fenton试剂和石灰对苎麻脱胶煮炼废水进行氧化混凝处理的方法.试验表明,当FeSO4·7H20、H2O2(质量分数30%)、饱和石灰乳的投加量分别为3 g/L、3 mL/L和4 mL/L时,CODcr的去除率>50%,色度去除率>90%.更重要的是,处理后出水可部分回用于煮炼生产,从而节约生产用碱量,减少废水排放量,还可提高废水可生化性,为后续生物处理创造条件.该处理方法是一种清洁生产处理方法,具有较广阔的应用前景.     

大塑性变形制备超细晶生物医用钛合金的研究进展

生物医用钛合金具有高强度、良好的耐蚀性能、较低的弹性模量、优异的生物相容性,已成为具有广阔应用前景的医用金属材料之一.与传统医用钛合金相比,超细晶医用钛合金具有更高的强度与更好的疲劳性能以及耐腐蚀性能.此外,超细晶钛合金可诱导骨组织向内生长,增加界面结合强度,加快骨修复进程,在硬组织修复材料领域具有广阔的应用前景.阐述了各种大塑性变形（Severe Plastic Deformation）法制备超细晶生物医用钛合金的研究状况与最新进展,指出了SPD法制备医用钛合金中存在的技术问题和发展方向,并展望了利用SPD法对生物医用钛合金改性将成为生物医用材料的研究热点.     

Low linolenate and commercial soybean oils diminish serum HDL cholesterol in young free-living adult females

OBJECTIVE: A mutant soybean line (A16) low in linolenic acid content (2% of oil by weight) was developed to increase oil oxidative stability. It was unknown whether serum lipid and lipoprotein concentrations in humans would be affected should A16 soybean oil (A16 oil) replace commercial soybean oil in diets. This study was conducted to examine the hypothesis that in free-living normolipidemic women, the consumption of A16 oil at approximately 10% of energy intake (en%) would not affect serum lipids and lipoproteins differently than would the consumption of the same amount of a commercial soybean oil with 7% of linolenic acid content. DESIGN: Fifteen free-living female college students consumed the soybean oil daily with regular meals for 9 weeks in different orders, with each test oil being eaten for 3 weeks. During the study, 13 en% was provided by each test oil and a total of 35 en% was from dietary fat. Serum concentrations of total cholesterol, high-density lipoprotein cholesterol (HDL cholesterol), low-density lipoprotein cholesterol (LDL cholesterol) and triacylglycerides (TAG) were measured. Serum total fatty acid patterns were analyzed as well. RESULTS: Each of the three test oils decreased serum total cholesterol, LDL cholesterol and TAG concentrations from the baseline values. The feeding of A16 and commercial soybean oils decreased serum HDL cholesterol significantly compared with coconut oil (p < 0.05). Dietary inclusion of coconut oil increased serum myristic acid significantly more than did either soybean oil (p < 0.01). Serum arachidonic acid concentrations were significantly greater with A16 consumption than with commercial soybean oil consumption (p < 0.001). CONCLUSION: A16 and commercial soybean oils both diminished serum HDL cholesterol. Although the fatty acid composition differed between the two soybean oils, A16 oil and commercial oil had similar effects on serum concentrations of lipoproteins and lipids. With increased oxidative stability, A16 oil is a good alternative to commercial soybean oil.     

一种用步进器指令编程的方法及应用

本文介绍了一种用可编程序控制器（ＰＣ）的步进器指令编程的方法。并通过应用实例证明了该方法可以简化逻辑设计避免逻辑竞争。     

CAD中任意复杂装配图成图原理

本文介绍了ＣＡＤ中任意复杂装配图生成的技术关键。讨论了零部件的统一表示模式、零件的分类及处理策略，提出了一种新的轮廓识别算法，实现了以零件生成为前提、集合运算和轮廓识别为基本手段的装配算法，其中包括定位问题的处理，装配关系的提取，以及轮廓线、细实线、占划线、剖面线的综合处理方法。本方法作了为商品化软件ＰＬＡＧＥ的重要组成部分，已应用于工厂设计中。