关于"计算机组成原理"实验课教学改革的探讨

文章就"计算机组成原理"实验教学的有关问题进行了探讨,指出了目前存在的一些问题,并重点探讨了提高实验教学效果的方法和途径。     

利用对流参数化模型对8颗S＋r星的研究

目前观测到的s r星数目正逐渐增多,为了进一步确定s r星的形成机制以及它们与s-星和r-星的关系,采用对流模型的参数化方法拟合了新观测到的8颗s r星的观测数据,拟合结果与观测符合得较好,进一步验证了原有模型的有效性和正确性.     

单圈图Merrifield-Simmons指标的第三大值

图G的Merrifield-Simmons指标是指图G 的独立集的个数,其中包括空集.文献[2]得到n阶单圈图中具有最大、次大、 最小的Merrifield-Simmons指标的图类,以及讨论了当圈长为k时具有最大Merrifield-Simmons 指标的图.文献[3]给出了圈长为k的n阶单圈图的第二大Merrifield-Simmons指 标.本文得出了圈长为k的n阶单圈图的Merrifield-Simmons指标的第三大值和单圈 图簇∪nk=3C(n,k)的Merrifield-Simmons指标的第三大值及对应的图.     

Mobile Commerce User Acceptance Study in China: A Revised UTAUT Model

User acceptance is one of the key fundamentals for development and success of mobile commerce (m-commerce). Based on the revised unified theory of acceptance and use of technology (UTAUT) model, we described a theoretical framework that incorporates the unique characteristics of m-commerce to enhance our understanding of m-commerce acceptance and usage in China. The revised UTAUT includes the characteristics of m-commerce, inclusion and consideration of information system user satisfaction theory, and Chinese culture and context.     

盐酸氨基脲缩水杨醛与CuCl_2的配合物的热色性研究

从盐酸氨基脲出发,经与水杨醛缩合,再与氯化铜配合等步骤,生成了席夫碱的配合物。目标化合物经IR、远红外光谱以及元素分析确证了分子结构,并通过差示量热扫描分析(DSC)测定了其变色的温度范围。升温时,在50～110℃有变色峰出现;降温时,在45～85℃出现变色峰。与目测法结果相符,证明该化合物是一新型可逆热致变色配合物。     

渐开线圆柱齿轮的无公式设计

通过对传统理论的公式及设计方法的改进，阐述了渐开线圆柱齿轮无公式设计的理论依据及设计方法，并通过实例验证其在机械行业中的应用，该方法使齿轮传动设计更加简单、实用．     

Inhibition of DNA restrictive endonucleases and Taq DNA polymerase by trimalonic acid C60

Activities of trimalonic acid fullerene (TMA C_60) on DNA restrictive enzymatic reaction were investigated by using two restrictive endonucleases Hind III and EcoR I and plasmid pEGFP-N1 with single restric-tive site for both enzymes. Meanwhile, TMA C60 was also tested to clarify its effects on polymerase chain reaction (PCR) with the catalyst of Taq DNA polymerase and the template of plasmid pEGFP-N1. The products from restrictive reactions or PCR were detected by agarose gel electrophoresis. It was found that the product amounts from restrictive reactions or PCR decreased significantly with addition of TMA C60. The inhibition by TMA C60 was dose-dependent and IC50 values for reactions of Hind III, EcoR I and PCR were 16.3, 6.0 and 6.0 μmol/L, respectively. Addition of two scavengers of reactive oxygen species (ROS), L-ascorbic acid-2-phosphate ester magnesium and sodium azide at the con-centrations of 2―10 mmol/L did not antagonize the activities of TMA C60 against PCR and two restrictive reactions. However, increase of Taq DNA polymerase amounts in PCR system antagonized the activities of TMA C60. These data implied that TMA C60 was able to inhibit the activities of the three above-mentioned enzymes involved in DNA metabolism, and that this inhibition probably did not correlate to ROS.     

基于博弈论的最优投标报价模型

为了使投标者能够中标并获得较高的收益,就要讲究方法和策略。在文献[1]和文献[2]的基础上,把投标者成本分布确定为最接近现实情况的参数μ和σ的正态分布,研究并建立了信息对称下的投标博弈模型,得出了不同投标者的最优报价水平。     

"企业余额查询系统"的VB设计和实现

从企业电算化会计的角度出发,用vb access2000设计一套企业借贷查询即余额查询系统,给出了一种在vb下显示数据库数据的新方法,使该系统能够满足企业对于借贷记录添加和查询的基本要求,经过实践,该系统的效果比较明显。