维生素C-磷脂复合体抑制LPS诱导小鼠腹腔巨噬细胞氧化应激的研究

 为了比较维生素C-磷脂复合体（VitC-PC）和VitC体外抑制小鼠腹腔巨噬细胞氧化应激的活性,本研究提取小鼠腹腔巨噬细胞,在体外培养,用沙门氏菌脂多糖（LPS）诱导氧化应激,分别用不同浓度VitC和VitC-PC进行处理,测定培养液一氧化氮（NO）、乳酸脱氢酶（LDH）、丙二醛（MDA）和细胞内诱导性NO合成酶（iNOS）,以评价细胞炎性反应、细胞膜完整性和脂质过氧化程度。同时静息态腹腔巨噬细胞与不同浓度的VitC或VitC-PC共孵育,测定细胞内VitC浓度,以评价细胞摄取VitC或VitC-PC的效率。结果发现,在高浓度添加VitC时,巨噬细胞摄取VitC-PC的效率高于VitC（P<0.05）,VitC-PC抑制LPS诱导巨噬细胞释放NO、发生脂质过氧化（产生MDA）和细胞膜损伤（LDH泄露）的效率显著高于VitC（P<0.05）。因此,本研究证明VitC-PC比VitC更易进入细胞内部发挥抗氧化作用。     

反相高效液相色谱法测定化妆品中的酮麝香

 酮麝香是化妆品中的限用物质,对人体有致癌作用,因此,有必要对其含量进行分析。采用超声辅助提取法对不同基质类型的化妆品样品进行预处理。利用反相高效液相色谱法测定化妆品中的酮麝香。色谱条件为Kromasil C₁₈(250mm×4.6mm i.d.,5μm)色谱柱,流动相V(乙腈):V(水)= 80:20,流速1.0mL/min,检测波长235nm。结果表明,在此条件下,酮麝香在0.5-150 μg/mL范围内与相应的峰面积具有良好的线性关系(相关系数r为0.9998),线性回归方程为A=13500ρ-4829,回收率为90.5%-102.5%,RSD为0.45%-0.98%。因此,研究建立的利用反相高效液相色谱法测定化妆品中的酮麝香的方法准确、可靠、适用性广,可为酮麝香的分析及国家相关法规的制定提供一定的参考。     

多重运输调度问题的分枝定界算法及界限估计

多重运输调度问题（ＭＶＲＰ）来源于大规模生产过程的运输组织与实施。本文建立了ＭＶＲＰ的数学规划模型,研究了模型的变形形式、结构特征及解的性质;基于ＭＶＲＰ的数学规划模型,提出了它的分枝定界算法;最后给出了ＭＶＲＰ的上、下界的两个估计式,获得了需求矩阵在平衡时解的精确表示。     

Method of Stabilizing the Surface Energy of Fabrics Coated with Silicone

Silicone coatings have been used in this study. The method adopted was the liquid drop analysis on the coated fabrics. The contact angle between a liquid drop and the fabric surface was measured with two liquids continuously and recorded by a computer. The surface energy was calculated by means of Owens method. Kinetic measurement was adopted. The contact angle of liquids on the fabric coated silicone decreased with time was found. A compound solution DX has been found, so that the contact angle of the liquids on the fabric washed with DX becomes constant, and the surface energy of the fabric can be reduced to below 15 mJ/m2.     

Grinding Characteristics Of Directionally Aligned SiC Whisker Wheel - Comparison With A12O3 Fiber Wheel

A unique SiC whisker wheel was invented, in which the whiskers were aligned normally to the grinding wheel surface. In this paper, grindabilities of the SiC whisker wheel are investigated and compared with those of other wheels of SiC grains, Al2O3 grains, as well as Al2O3 long and short fibres which were also aligned normally to the grinding wheel surface, respectively. The main research contents concern grinding characteristics of a directionally aligned SiC whisker wheel such as material-removal volume, wheel-wear rates, integrity of the ground surfaces, grinding ratios and grinding efficiency. Furthermore, grinding wheels of whiskers and fibres have a common disadvantage: they tend to load easily. The authors have proposed a simple method of loading-free grinding to overcome this propensity and investigate some related grinding characteristics under loading-free grinding conditions.     

熔融石英光导棒——一种新颖的温度传感元件

本文利用Stefan-Boltzman定律，Wien位移定律及几何光学原理，在理论推导及计算的基础上，结合具本试验证明了“熔融石英光导棒”作为一种温度传感元件在理论上是可行的，在工业生产中有较大的推广价值。     

顾客满意——一种全新的企业经营战略

探讨顾客满意的企业战略特征。详细论述了顾客满意是企业的经营理念、产品、服务及内部员工的满意 ,说明顾客满意的企业战略不仅是企业获得竞争优势的保证 ,而且也是企业生存与发展的文化基础。这对我国企业界和学术界有着不可言喻的重要意义     

陶瓷超塑性综述

现已公认超塑性是陶瓷中一种很有潜力的变形工艺.本文总结了陶瓷及其它非金属材料中超型性的主要特点并考察了这些材料中相变与组织两种超塑性的报导.结果表明其与金属既有相同又有不同之处.相同的是应变速率随应力及晶粒尺寸的变化,重要的区别是必须考虑到陶瓷中的晶间非晶相的作用.在金属间化合物及地质材料中超塑性同样也是重要的,在地质材料中无论在试验室试验或自然界的变形中部有超塑变形的迹象.     

欧式期权波动率校准反问题的正则化算法

标的资产的隐含波动率校准问题无论在理论上还是实际应用中都有重要意义.对于欧式期权,在Black-Scholes模型框架下,提出了一个正则化的最小二乘算法,有效地解决了在期权市场价格已知前提下的隐含波动率校准反问题.最后,通过数值算例说明了方法的有效性.