The Difference of the Pulmonary-Artery Pressure of the Migrants from Difference Elevation at the 4636 - 4907 m Altitude

Study Objective： To compare and analyze the changes of the pulmonary-artery pressure of the migrants coming from different elevation in the hypoxic environment of 4636 - 4907 m extreme altitude. To explore the susceptibility to hypoxic pulmonary-artery hypertension （PH） in the subjects from different altitude and profession. Methods： By using Color Doppler Ultmsonography （CDU）, measuring the pulmonary-artery pressure of 207 healthy men, who had continuously being lived and worked at the extreme altitude for more than six months, and then were divided into three groups according to their profession and the altitude of original living place. Results： There was a significant difference in the outcomes of pulmonary-artery pressure from the 3 groups. Conclusions： Altitude of original living place, labor intensity are some of factors that impact the pulmonary-artery pressure of the people who exposure to a hypoxic environment. The pulmonary- artery pressure of person without strenuously physical work experience was more sensitive to hypoxic surroundings than that of labor workers. It was not always the fact at an extreme altitude that the moderate altitude mountaineers were superior to other migrants from a lower altitude or plain. The higher PH was found in the groups of the moderate altitude mountaineers and labor workers. It is unlikely certain that one with PH would surfer from HAPE.     

快速成型技术的典型方法比较

本文介绍了一种当今国内外最新制造技术—快速成型技术。对该技术的四种典型方法进行了较详细的分析和比较，并对快速成型技术的未来发展提出了自己的看法。     

重组pET30a/hsBLyS质粒在BL21(DE3)菌株中的稳定性观察

将构建的含有pET30a/hsBLyS重组质粒的BL21 (DE3)菌种,在含硫酸卡那霉素的平板培养基划线连续传代至 100代 100代次菌种经显微观察,为典型的革兰氏阴性大肠杆菌,生化特性没有改变 提取0、50、100代质粒DNA限制性内切酶切割检查,酶切图谱没有改变,DNA测序未见hsBLyS基因变异 传代前后菌种诱导表达hsBLyS,表达水平和hsBLyS生物学和免疫学活性均无明显差异     

在生物圈保护区中开展生态旅游的探讨

介绍了生物圈保护区和生态旅游产生的背景和发展，论述了在生物圈保护区中开展生态旅游的可行性以及对其产生的正负影响，提取了应采取的对策。     

Effects of aqueous media on microbial removal of sulfur from dibenzothiophene in the presence of hydrocarbons

The existence of sulfur in the petroleum would erode the transport lines and poison the chemical catalysts. In addition, it is the main cause of air pollution and the for-mation of acid rain. At present, hydrodesulfurization (HDS) is the commonly used technology for fuel desulfu-rization. HDS has the disadvantages of high cost of ma-nipulation and equipment investment. Furthermore, HDS is difficult to remove the sulfur from condensed thio-phenes such as dibenzothiophene (DBT). These forms…     

应用人工神经网络的无功／电压控制新方法

本文利用人工神经网络中的HOPFIELD连续模型(HNN)来求解电力系统中的无功优化问题,对HNN模型作了改进,使其能够处理等式约束和不等式约束,从而使得HNN模型可以应用于求解非线性规划问题。在算法上,和传统的无功优化方法不同,本方法不区分状态变量和控制变量,只以节点电压作为DNN模型能量函数中的自变量。该方法开发了HNN神经网权值矩阵的稀疏性。通过对雅可比矩阵的修正,引入了变压器变比的变化。另外,本文还从理论上分析了HNN模型的能量的性质,探讨了一种修正HNN模型能量函数中参数的方法,从而保证了解的可行性。最后,通过两机系统,IEEE-6节点,IEEE-30节点系统的测试,验证了这两种模型的正确性。     

微波辅助酸改性粉煤灰对活性艳红的吸附性能研究

以浓盐酸为改性剂,微波辅助制备酸改性粉煤灰,利用SEM、FTIR对其结构进行表征,利用分光光度法研究其对活性艳红的吸附性能.结果表明:盐酸用量为4 mL/g、微波功率为400 W、微波时间为10 min时,制得的酸改性粉煤灰做吸附剂,常温下,当吸附剂用量为26 g/L、废水pH为9、吸附时间为60 min时,活性艳红脱色率达96.6%以上.     

第三代蜜网在园区网中的应用

蜜网（Honeynet）是信息安全领域相对较新的一个概念,主要作用是收集黑客的攻击信息。随着蜜网技术的引入,可以将安全防护从被动方式变为主动方式。阐述了第三代蜜网体系结构,分析了数据控制、数据捕获、数据采集和数据分析模块在蜜网中的实现,并介绍了蜜网在校园网中的应用。     

西藏沙棘(Hippophae tibetana)的花期、花形态及其花朵数量的初步研究

文章通过对分布在西藏墨竹工卡县日多境内的西藏沙棘种群的样方调查,描述了西藏沙棘的花期、雌雄花的形态特征,比较两个不同海拔样带(4200m和4400m)内的西藏沙棘花朵数量的差异。结果表明,西藏沙棘在该研究地内的花期一般是5-6月,雄花比雌花的开放要早3～4天,一标准雄花枝产生的平均花朵数量比雌花枝平均花朵数量多,但两个海拔样带内的花朵数量无显著差异。     

岩石力学参数综合测试及其生产实践应用

将作者近２０年来对岩石单轴综合测试的数据列表，这些数据有岩石单轴抗压强度、抗张强度、抗剪强度、弹性模量、泊松比和内摩擦角等，并确定了岩石单轴抗压强度与抗张强度的比值；还将岩石按其强度划分了等级，以资生产实践应用。