间断温血灌注心肌保护作用的实验研究

目的 研究间断温血灌注的心肌保护效果。方法 21只孤立灌注的犬心随机分为3组。Ⅰ组行持续温血灌注；Ⅱ组行间断温血灌注，间歇缺血期为10min，Ⅲ组行间断温血灌注，间歇缺血期为15min。结果 灌注2h,3h后，心肌超微结构改变，冠状静脉窦回流血血清肌酸磷酸激酶（CPK－MB）含量的变化，Ⅰ、Ⅱ2组组内、组间的无明显差异（P＞0．05），Ⅲ组组内与Ⅰ、Ⅱ组组间差异显著（P＜0．01）。结论 间断温血灌注、间歇缺血期时限适当，心肌没有明显累积性不良影响，与持续温血灌注具有相同的心肌保护效果。间歇缺血期最高时限，定为10min较安全。     

豫南板栗干枯病的预防研究初探

板栗干枯病若在豫南地区由点及面的蔓延、发展开来，势必将会使豫南１２万公顷的板栗树全部毁灭，且同时造成豫南严重的水土流失和生态环境的恶化；我们详细调查了此病在豫南地区板栗园中的不同发生情况，并提出了严格检疫消毒苗木、改良土壤增强树势、降低密植度、加强清园工作、重视冬季树体保护、控制早春板栗园内温差及时刮去病疤六项预防措施。     

开采引起的地表裂缝深度和宽度预计

以实验室模拟试验为基础,获得了地表裂缝发育的一系列规律,建立了地表裂缝发育极限深度的预计模型,建立了裂缝发育宽度和深度关系的典型曲线.实例证明,预计模型是正确的,具有很大的实用价值.     

冶金工程专业高素质人才培养的研究

介绍了冶金工程专业教育的发展状况及前景，提出要使我国变为钢铁强国，就必须加大了台金技术人才的培养，并进一步阐述了如何培养适应21世纪钢铁工业发展的高素质冶金工程专业应用型人才。     

论互联网背景下的版权保护

数字技术和互联网的发展给传统的版权保护带来了巨大的冲击,基于此背景,阐述了版权保护的意义,分析了我国在互联网背景下版权保护的现状,并就其存在的一些问题提出了相关建议,以期营造良好的版权保护环境,并寻求资源开发者与使用者间利益的平衡,进而加速版权产业的健康快速发展。     

添加剂对含硫镍粉流态化脱硫效果的影响

本文对含硫镍粉进行了脱硫实验研究，研究结果表明：用石英砂作为添加剂对含硫镍粉进行氢还原流态化脱硫是行之有效的。加入一定量的添加剂，可于2～5分钟内将含硫12％左右的镍原矿粉料脱硫至所要求的1．5％以下。     

Improving thermal insulation of TC4 using YSZ-based coating and SiO2 aerogel

In this paper, air plasmas spray(APS) was used to prepare YSZ and Sc2O3–YSZ(Sc YSZ) coating in order to improve the thermal insulation ability of TC4 alloy. Si O2 aerogel was also synthesized and affixed on TC4 titanium alloy to inhabit thermal flow. The microstructures, phase compositions and thermal insulation performance of three coatings were analyzed in detail. The results of thermal diffusivity test by a laser flash method showed that the thermal diffusivities of YSZ, Sc2O3–YSZ and Si O2 aerogel are 0.553, 0.539 and 0.2097 10 6m2/s, respectively. Then,the thermal insulation performances of three kinds of coating were investigated from 20 1C to 400 1C using high infrared radiation heat flux technology. The experimental results indicated that the corresponding temperature difference between the top TC4 alloy(400 1C) and the bottom surface of YSZ is 41.5 1C for 0.6 mm thickness coating. For 1 mm thickness coating, the corresponding temperature difference between the top TC4 alloys(400 1C) and the bottom surface of YSZ, Sc YSZ, Si O2 aerogel three specimens is 54, 54.6 and 208 1C, respectively. The coating thickness and species were found to influence the heat insulation ability. In these materials, YSZ and Sc YSZ exhibited a little difference for heat insulation behavior. However, Si O2 aerogel was the best one among them and it can be taken as protection material on TC4 alloys. In outer space,Si O2 aerogel can meet the need of thermal insulation of TC4 of high-speed aircraft.     

高炉铸铁冷却壁结构优化

采用正交试验和数值模拟方法对高炉炉身下部冷却壁主要结构参数进行优化,对优化前后的冷却壁温度场进行计算。结果表明,冷却壁热面最高温度的影响因素中影响程度从大到小依次为:水管直径、水管间距、水管中心线距冷却壁热面距离、壁体厚度,其中水管直径、水管间距和水管中心线距冷却壁热面距离为显著因素;最优冷却壁结构参数组合为:水管直径60mm、水管间距180mm、水管中心线距冷却壁热面距离120mm、壁体厚度220mm,优化后的冷却壁较优化前的冷却壁冷却性能有较大幅度的改善。     

The impact of warrants introduction: Sign effect or magnitude effect?

The data of warrants underlying stocks was selected for the sample period from August, 2005 to December, 2009. These data the authors collected did not include the announcement date of reform of non-tradable underlying shares, and was available from Shanghai and Shenzhen stock exchanges. The event study method is employed to test the magnitude effect based on the Wild bootstrap, which is performed on the abnormal return, the cumulative abnormal return, and the standardized cumulative abnormal return. Empirical results show no evidence of magnitude effect but sign effect after warrants introduction. The authors argue that this phenomenon is caused by the migration of radical agents from stock market to warrant market.     

GPS抗干扰单星约束自适应滤波器组设计与仿真

提出了一种分别针对多颗GPS卫星的波束形成自适应抗干扰实现方法,称为单星约束自适应滤波器组方法,用于GPS抗干扰处理,各个滤波器使阵列天线形成的主瓣分别对准每个期望卫星,从而提高接收信干噪比。该方法的自适应部分通过Givens旋转实现,并利用Givens旋转的结构特点,共用了大部分运算,降低了单星约束滤波器组的运算量。相比多星约束方法,能够提高信干噪比,并且计算量不会显著增加。仿真结果表明该方法相比多星约束方法,能显著提高信干噪比。