复肝肽口服液对大鼠四氯化碳慢性肝损伤的保护作用

目的观察复肝肽口服液(主要成分为新生牛肝活性肽)对大鼠四氯化碳(CCl4)慢性肝损伤的保护作用。方法制备大鼠CCl4慢性肝损伤模型,观察复肝肽口服液对慢性肝损伤大鼠红、白细胞数、血色素、血清丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(AST)、总蛋白(TP)、白蛋白(ALB)、白球蛋白比例(A/G)的影响。结果与模型对照组比较,复肝肽3个剂量组大鼠的A/G值均明显升高,肝组织病变明显减轻,高剂量组ALT、AST明显降低。结论复肝肽口服液对慢性肝损伤有明显的保护作用。     

Electrochemical study of calcium carbonate deposition on iron. Effect of the anion

Deposition of calcium carbonate on iron from supersaturated solutions containing 1 M sodium chloride, bromide, iodide, or nitrate as supporting electrolyte was studied at 60 °C under open-circuit conditions using impedance spectroscopy, chronopotentiometry, voltammetry, and scanning electron microscopy. The anions were found to fall into two groups with respect to their effect on scaling. On the one hand, chloride and, especially, nitrate favor faster scaling kinetics and lead to compact carbonate films composed of entangled aragonite crystals. On the other hand, in the presence of bromide and iodide the scaling rate is lower and the resulting films feature aragonite crystals more or less freely scattered on what appears to be a uniform sublayer of unknown structure. The experimental data are adequately described using quasi-uniform film model accounting for the cathodic and anodic electrode reactions. As deduced from the electrochemical measurements, the barrier properties of the carbonate films formed in different supporting electrolytes increase in the order of Cl⁻ < NO₃⁻ ≈ Br⁻ < I⁻.     

An On-Site Cooling Tower Treated by Stand-Alone Low-Concentration Dissolved Ozone

We report on an on-site 500 RT cooling tower ozone treatment process, in which chemicals other than ozone itself were completely eliminated. Ozone in an amount leading to less than 0.1 ppm of dissolved ozone was continuously introduced via side-stream injection into the circulating water returning from the chiller. The ozonated water was initially made to flow from the distributor to the filler in order to eliminate the growth of algae, and then to the chiller to reduce the corrosion and the fouling in the water. Positive ions such as Ca⁺² and Mg⁺² in the circulating water were precipitated by chelating them with carboxylic acids formed by the oxidation of organic compounds. We observed that using an ozone dosage of 0.1 ppm resulted in a colony-forming unit (CFU) less than 2 × 10³ /mL. With that well-controlled CFU, corrosion controlling and scale reducing were achieved as well.     

电子汽车衡防作弊系统的开发与应用

针对电子汽车衡器产生的作弊手段日渐增多,而且呈现高科技化的现状,着重介绍在实际工作中遇到的各种作弊方式,以及针对这些作弊现象开发的汽车衡防作弊系统,并对防作弊系统的实施效果进行了总结。     

相似理论在真空灭弧室研究和设计中的应用

本文应用相似理论得出,真空灭弧室中电弧运动速度与电流强度成线性关系的相似准则,和极限开断电流与触头直径、开距间的经验公式。认为用小电流模型来研究大电流真空灭弧室是可行的。     

具有符号式位置正解的2T1R并联机构的运动学分析与尺度综合

基于方位特征方程的并联机构拓扑设计理论和方法,设计一种零耦合度且具有符号式位置正解的两平移一转动并联机器人机构,分析计算机构的方位特征集、自由度以及耦合度等拓扑特性。利用机构支链运动副布置的特点建立运动学方程,计算出正运动学和逆运动学的位置解析式,通过一组算例验证计算结果可靠性。研究机构的奇异性并给出正解奇异和逆解奇异的产生条件。分析机构的工作空间,以给定的工作空间作为约束条件,建立实际工作空间最小化的优化目标,选择天牛群优化算法优化得到满足给定的工作空间且使实际工作空间最小的设计结构参数最优解。结果表明：机构具有符号式的位置正解,且工作空间形状规则,呈对称分布、边界光滑。     

电液伺服系统的完整建模及变尺度多调整因子解析模糊控制

从考虑电液伺服系统的非线性和参数的时变性出发,建立了电液伺服系统的完整模型。并采用了一种改进的变尺度多调整因子模糊控制器控制。仿真结果表明此控制方法能有效控制此时变电液伺服系统模型。     

慢性粒细胞白血病Bcr/Abl基因OD域融合蛋白的原核表达及纯化

目的原核表达并纯化慢性粒细胞白血病(CML)Bcr/Abl基因OD域融合蛋白。方法将TAT、OD和HA基因片段顺次克隆入pET32a(+)原核表达载体,构建重组原核表达质粒pTAT-OD-HA,经PCR、双酶切和测序鉴定正确的重组质粒转化E.coliBL2(lDE3),IPTG诱导表达,表达产物经SDS-PAGE及Westernblot分析后,用镍离子亲和层析柱纯化。结果所构建的重组质粒pTAT-OD-HA经PCR、双酶切及测序鉴定正确;表达的重组蛋白相对分子质量约为30000,诱导6h蛋白表达量达最高,约为10%;Westernblot分析显示,该蛋白可与鼠抗HA单克隆抗体发生特异性反应;纯化后纯度约为95%。结论已成功原核表达并纯化了TAT-OD-HA融合蛋白,为进一步研究其在CML中的作用奠定了基础。     

三元共聚物防垢剂的合成与性能研究

以水为溶剂,过硫酸铵为引发剂,马来酸酐、乙酸乙烯酯和丙烯酸为原料,合成了三元共聚物防垢剂,并对其进行了性能评价。研究了三元共聚物的质量浓度、温度及体系pH值等条件对其防垢率的影响。结果表明,合成的马来酸酐/乙酸乙烯酯/丙烯酸三元共聚物防垢剂对碳酸钙的防垢效果较好。     

浮法玻璃配合料制备过程控制

优质玻璃配合料的制备是玻璃生产的主要环节,它是高效、优质、低产、低耗生产玻璃的先决前提。优质配合料的制备并不是一件轻而易举的事,涉及到要处理许许多多的环节。本文从配合料质量要求、原料的称量、配料控制系统、皮带输送、调和等方面,试述玻璃配合料的制备过程和注意环节。