空空导弹移植为面空导弹需要考虑的几个问题

本文通过对空空导弹移植为面空导弹的可行性分析,阐述移植过程中需考虑的问题,结合在空空导弹移植为面空导弹的科研过程中的各种试验经验和数据,指出空空导弹移植为面空导弹需要注意的问题。     

用乘积的导数求解线性微分方程

介绍了一种简便的计算线性方程积分方法，即化方程左端为乘积的导数的方法。     

Tuning and Assessment of Proportional–Integral–Derivative Controller for an Automatic Voltage Regulator System Employing Local Unimodal Sampling Algorithm

Abstract—This article presents an approach for obtaining proportional–integral–derivative controller parameters for an automatic voltage regulator system based on a local unimodal sampling optimization algorithm. A conventional integral time of squared error objective function and modified objective functions in terms of integral time of absolute error, integral of absolute error, integral of squared error, peak overshoot, and settling time with appropriate weighting factors are employed to tune the controller parameters. Different objective functions are employed to obtain optimized proportional–integral–derivative controller gains. Superiority of proposed technique over some recently published modern heuristic optimization techniques, such as artificial bee colony algorithm, particle swarm optimization algorithm, and differential evolution algorithm, for the same automatic voltage regulator system is demonstrated. Simulation results reveal that the proposed proportional–integral–derivative controlled automatic voltage regulator system tuned by the local unimodal sampling algorithm with modified objective function exhibits better performance in terms of settling time, peak overshoot, and stability. The robustness of the system tuned by the proposed algorithm is also studied satisfactorily by varying the time constants of the automatic voltage regulator system in the range of –50% to +50% in steps of 25%.     

LiFe[Fe（CN）6]作锂离子电池材料的研究

普鲁士蓝锂铁衍生物具有完美的立方晶体结构,在晶体结构中存在空隙,为锂离子的嵌脱提供了可能。测试了该材料的电导率和锂离子在其中的嵌入／脱嵌能力,并对以其作为正极材料的锂离子电池样品进行了充放电测试。结果表明,该材料适合作为锂离子电池正极材料。     

中药大黄中蒽醌衍生物成分分析及其稳定性

体外抗菌实验证明,中药大黄对一些真菌、细菌均有较好的抑制效果,其抗菌活性成分主要为游离蒽醌衍生物中的游离大黄酸类等物质.以1,8 二羟基蒽醌为标准物,采用比色法对这类物质进行了定量分析,并对其在不同温度、pH值、光照等条件下的稳定性进行了研究,结果表明,活性成分具有很好的热稳定性,pH值稳定性为酸性>中性>碱性,在相同pH值条件下室内自然光照的稳定性优于日光照射.     

胰高血糖素样肽1与糖尿病的治疗

胰高血糖素样肽1(glucagon-like peptide-1,GLP-1) 是由肠道L 细胞分泌的一种重要的肠促胰岛素激素, 其在体内的主要生理作用有刺激胰岛素的分泌和释放、抑制胰高血糖素的分泌、促进胰腺β 细胞的增殖并抑制其凋亡、抑制胃的排空、促进饱食感的产生等。GLP-1 对糖尿病和肥胖具有很好的治疗前景。由于GLP-1 在体内很快被二肽酰基肽酶Ⅳ降解, 血浆半衰期很短, 因而限制了其临床应用。现已发现了促进GLP-1 分泌的物质, 开发了多种GLP-1 的衍生物和二肽酰基肽酶Ⅳ抑制剂, 为开发新型糖尿病治疗药物开辟了新的天地。     

相对导数在微分几何中的应用

引入相对（偏）导数概念并且说明了其物理意义，特别是指出了其对于运动曲面几何量的研究是一个强有力的工具。     

Unification in datastructure multisets

In a recent paper A. Herold and J. Siekmann generalize pure AC unification to terms containing additional function symbols. Generalized AC unification thus attains practical relevance for a broad range of applications. Pure AC unification is used as a basic mechanism and it is this key role that has motivated our research. We have improved upon earlier approaches by basing (pure) AC unification on a firm theoretical basis and presenting algorithms which fully exploit the properties of the underlying mathematical structure. In particular, the high degree of parallelism for AC unification will become apparent. Our algorithms have been designed for parallel hardware but still yield significant improvements over earlier algorithms when used in the sequential mode.     

4、6-二甲氧基-2-甲砜基嘧啶的合成研究

以硫脲、丙二酸二甲酯为原料,经缩合、O-烷基化和氧化反应合成了4、6-二甲氧基-2-甲砜基嘧啶,产品总收率59.1%,纯度96.0%。通过熔点测定、红外光谱、元素分析验证了中间体及目标分子结构。     

甲醇开发醋酸及其衍生物有前途

简要介绍了国内甲醇的生产情况和醋酸的几种生产工艺,并对醋酸的几种衍生物的产需情况进行了分析。