BC480-22/42支架液压系统的大流量技术改造

分析了BC-480支架在综采工作面使用中液压系统配置低的原因,提出了系统的改造原则和方案,比较了改制前后支架的动作速度.     

竞争条件下政府干预经济探析

分析了竞争条件下政府干预经济的原因,阐述了政府干预经济的作用,进而指出了政府干预经济存在的一些失误,提出政府干预经济应注意的问题,从而形成一个平等、高效的市场经济局面。     

Ca^2＋、Sr^2＋掺杂对Pr0.6CaxSr0.4-xFeO3-δ物相、结构及电性能的影响

采用柠檬酸-硝酸盐法合成了碱土金属双掺杂的Pr0.6CaxSr0.4-xFeO3-δ（X=0.0-0.4）系列复合氧化物粉体,用TG-DTA，XRD，FT-IR，SEM等手段对产物中钙钛矿物相的形成及微结构进行了表征,结果表明，样品在800℃焙烧2h后显现钙钛矿结构的主要衍射峰；随热处理温度的升高，XRD谱峰强度逐渐增大，1000℃煅烧2h即得到正交钙钛矿结构的单相固溶体；系列样品结晶化程度和晶粒尺寸随样品中Ca含量的增大而减小；电导率测试结果表明，Ca^2＋、Sr^2＋双掺杂样品的电导率随Sr^2＋含量的增大而增大，低温段（T≤650℃）烧结陶瓷体的导电行为遵循小极化子导电机制。     

Preparation and characterization of cuprous iodide nanoparticles

A new technique for the preparation of CuI nanoparticles from CuSO₄ and KI ethanol solutions has been developed. Preparation conditions were optimized through a series of experiments. Under these conditions, the yield of CuI reached 95.39%. The product was characterized and the reaction kinetics was studied. The results show that the product takes a roughly spherical shape with an average particle size of less then 50 nm. The activation energy of the formation of CuI is found to be E _a = 0.58 × 10² kJ/mol, and the preexponential factor in the Arrhenius equation is k ₀ = 7.43 × 10¹⁶ mol/(l s). The text was submitted by the authors in English.     

垂直管吸收器内泡式吸收过程的数值研究

建立垂直管吸收器管内泡式吸收过程中传热传质的数学物理模型，对其泡式吸收过程进行数值研究，获得泡式吸收方式的一些传热传质特性，为吸收器的优化设计提供一定理论指导。     

ISIS全局优化多道反演技术在墩2块岩性油藏描述中的应用

为进一步落实墩2块戴一段岩性油藏成藏规模及分布规律，针对该储层薄、横向变化快的特点，利用ISIS全局优化多道反演技术，对该构造区岩性储层进行了精细描述，较好的预测出戴一段储层平面分布规律。     

Plasma Sprayed Hydroxyapatite Coatings with Nano-hydroxyapatite Prepared by Ultrasonic Precipitation Process

Nano-particle hydroxyapatite （ HA ） was prepared with a novel ultrasonic precipitation process and the as-prepared nanopowder was used to produce hydroxyapatite （ HA ） coatings on titanium substrate via plasma spraying. The phase and the microstructare of the coating were characterized by X- ray diffraction （XRD） and scanning electron microscopy （SEM）. Results showed that spherical particles could be prepared by ultrasonic precipitation process; and a corresponding dense HA coating with molten surface and low-porosity cross-section structure was acquired. During the plasma spraying process, new phases of Ca3 （ PO4 ）2 and Ca2 P2O7 were generated. After heat-treating at 800℃ for 1 h, the contents of Ca3 （ PO4 ）2 and Ca2 P2O7 decreased while HA content increased. Tensile adhesion tests showed that the plasma sprayed coating prepared with the spherical nanoparticles exhibited high tensile bond strength.     

冠心病患者循环血中内皮细胞、内皮素和6－酮－前列环素F_（1a）的动态变化及意义

以循环内皮细胞（ＣＥＣ）作为血管内皮细胞（ＶＥＣ）损伤的指示物，以血浆内皮素（ＥＴ）和前列环素（ＰＧＩ２）反映ＶＥＣ的功能变化，对８５例冠心病患者与３０例正常人进行对比研究，并对５０例不稳定型心绞痛及２０例急性心肌梗塞进行了动态观察．结果表明：冠心病外周血中ＣＥＣ、ＥＴ明显升高（Ｐ＜０．００１），ＰＧＩ２明显下降（Ｐ＜０．００１），尤以不稳定型心绞痛和急性心肌梗塞更显著，与病情的严重程度相一致．提示冠心病ＶＥＣ损伤，以及它所分泌的内皮源性舒缩因子失平衡参与了冠心病的病理过程。