军事靶场力量建设问题研究

提出了军事靶场力量的概念及其所包含的内涵,分析了军事靶场力量的构成,研究了军事靶场力量建设中人才队伍建设、场区建设、装备建设、技术建设、法规建设等方面的问题。对深化军事靶场力量的认识和指导军事靶场力量建设有一定的现实意义。     

Component synthesis vibration suppression method of two component forces for flexible spacecraft

Considering the characteristics of two component forces on component synthesis vibration suppression(CSVS) method, two theorems on two component forces suppressing fractional multiple design frequency are given respectively. Meanwhile, the control force, which is composed by two arbitrary component forces with different initial time, can suppress certain frequencies for secondorder undamped vibration system. Using the above theorems, control moment of jet attitude maneuver on flexible spacecraft is designed on the basis principle of CSVS method. The simulations validate the correctness and effectiveness of the proposed method.     

Effects of molecular structure of polycarboxylate-type superplasticizer on the hydration properties of C3S

Effects of polycarboxylate-type superplasticizer(PC) molecular structure on the hydration heat of tricalcium silicate(C3S) paste and polymerization degree of hydration products(C-S-H gel) were researched by using TAM AIR isothermal microcalorimetry(TA) and 29Si nuclear magnetic resonance(NMR).Methoxy polyethylene glycol-methacrylates-based polycarboxylate superplasticizers with different side chain lengths and main chain lengths were employed.PC molecules with shorter main chain or longer side chains caused stronger retardation of C3S early hydration and lesser increase of C3S 3 d hydration degree.NMR measurement indicated that the incorporation of PC increased the hydration degree of C3S paste and the polymerization degree of silicon-oxygen tetrahedron of C-S-H gel.The tendency for C3S 7 d hydration degree to improve was more pronounced while PC molecules with longer main chain or shorter side chain were added.Whereas,PC molecules with longer main chains or longer side chains increased the 7 d polymerization degree of C-S-H gel.     

立式混流式水电机组动载荷的识别

水电机组的动载荷，是振动分析、动态设计的基础数据采用频响函数矩阵求逆法，识别了立式混流式水电机组动载荷的周期性部分     

自行车骑行过程中脚踏力的分析

本文提出了把在骑行过程中的脚踏力分解为直接由纯关节力矩而产生的肌肉分量和由重量与惯性力的作用产生的非肌肉分量的分析方法．在平面关节运动和关节力矩给定条件下，利用Ｎｅｗｔｏｎ－Ｅｕｌｅｒ系统中的动力学方程求解两个分量．通过在３个不同转速下承受普通载荷的自行车脚踏力的分析为例来说明脚踏力的分解方法．主要的结果是：非肌肉力分量的大小随转速增加而增加，肌肉力分量的大小基本保持相对恒定．     

试论我国非公有经济的存在和发展

我国非公有经济经历了过渡时期和改革开放以来两个不同的发展阶段。实践证明非公有经济对促进国民经济发展，增加就业，满足人们不同的需要方面发挥了重要作用，是社会主义市场经济的重要组成部分。     

自热方便食品水合发热剂的研究

为解决自热方便食品的发热剂问题，以罐装矿泉水、牛奶和八宝粥为加热对象，对几种化学物质在水合过程中的放热情况进行了研究，并通过正交实验确定了最佳组合，结果表明：一定比例的ＣａＯ、ＡｌＣｌ３和Ａｌ２（ＳＯ４）３粉状混合物在水合过程中放热量大，放热速度适中，安全无毒，无明烟明火，剂量小，可用作三片罐装水基自热方便食品的发热剂。本实验还提出了自热式三片罐的结构设想。     

Φ0.5米高超声速风洞连续变攻角测力试验数据处理方法研究

Φ0.5米高超声速风洞连续变攻角测力试验具有数据量大和试验效率高的优点,但受传感器响应不一致、模型自重及加减速过程的影响,无法对试验数据直接进行处理,需要对试验数据进行修正,主要开展了以下工作：首先通过测试确定了模型攻角控制系统运行参数、数采系统参数和软件采集策略;然后使用无延时数字滤波器对试验数据进行降噪处理,并应用互相关函数计算天平各分量相对攻角信号的延时,基于常规测力试验数据处理流程,系统提出了天平支杆弹性角、模型自重、模型离心力及惯性力的修正方法;最后开展了对比验证试验及天平温度效应试验,结果表明连续变攻角试验结果与常规阶梯试验结果吻合较好,连续变攻角试验技术可有效降低高马赫数条件下的温度效应。     

Segregation in granular materials and the direct measurement of surface forces using atomic force microscopy

It is known that one of the dominant forces controlling the macroscopic motion of particles is the cohesive force due to the presence of liquid bridges between particles. In a mixing process, this force directly impacts the degree of homogeneity achievable by the system. The work presented here provides a quantitative analysis of this relationship through concurrent direct measurements of surface forces due to moisture and blending/segregation experiments. Atomic force microscopy (AFM) was employed to measure the force required to remove the AFM's cantilever from the surface of a glass bead with varying degrees of surface moisture. Corresponding blending/segregation experiments were performed using the same materials and conditions to develop a correlation between the interparticle forces due to the liquid layer and the final state of a mixing process. The extent to which greater moisture content increased the interparticle surface forces was quantified, and it was observed that segregation decreases proportionately to increases in surface forces.     

碱激发烧煤矸石胶凝材料的力学性能和微观结构

用高浓度碱溶液激发烧煤矸石制备碱胶凝材料,对其激发进程和水化产物进行了探讨。研究了碱胶凝材料的力学性能、微观结构和特征。结果表明：水化产物是类似于沸石类结构的无定形碱-硅铝凝胶,碱溶液、液固比、养护温度和养护时间等因素影响着水化产物及其强度的形成。采用模数为1．23钠水玻璃与烧煤矸石混合(液固质量比0．3),在90℃养护24h可获得抗压强度为42．5MPa的碱胶凝材料。