基于自抗扰控制器的力矩电机伺服系统控制

自抗扰控制器能将被控对象的内、外“总扰动”进行估计并用前馈补偿的方法将其抵消,适于力矩电机因直接驱动所带来干扰的补偿与控制。针对测量噪声对线性自抗扰控制器观测器带宽的限制,提出了二阶线性自抗扰的相似结构,并结合三阶积分链式微分器对其效果进行了对比仿真验证。力矩电机的控制仿真实验表明,与二阶线性自抗扰算法相比,基于相似结构的改进的力矩电机控制,能在有测量噪声情况下兼顾系统跟踪精度、突加负载时抗扰动性与抗噪性。     

配合物[Ni(phen)3][(C6H5)2C(OH)COO]2·6H2O的合成、晶体结构及电化学性质

The title complex with benzilic acid and 1,10-phenanthroline monohydrate has been synthesized and characterized in the solvent mixture of water and methyl-alcohol. It falls into the triclinic, characteristic of the space group P1 with a=1.142 8(3) nm, b=1.638 8(4) nm, c=1.645 6(4) nm, α=74.428(5)°, β=84.205(5)°, γ=74.917(5)°, V=2.864 9(12) nm³, D_c=1.347 g·cm^-3. Z=2, F(000)=1 216, the reliability factor R₁=0.068 9, wR₂=0.189 9. The crystal structure shows that the nickel atom is coordinated with six nitrogen atoms from the three phens, forming a distorted octahedral coordination geometry. The cyclic voltametric behavior of the complex is also reported. CCDC: 274184.     

高阶常微分算子特征值的重数关系

本文借助于边条件空间的几何结构,证明了自伴的高阶常微分算子特征值的解析重数等于几何重数,这是对常型Sturm-Liouville问题相关结果的一个推广.     

分光光度法测定半水煤气中微量炔烃的研究

本文研究了利用分光光度法测定炔烃条件，并实测了半水煤气中炔烃，结果令人满意。     

A NEW FRAMEWORK OF PRIMAL-DUAL INFEASIBLE INTERIOR-POINT METHOD FOR LINEAR PROGRAMMING*

On the basis of the formulations of the logarithmic barrier function and the idea of following the path of minimizers for the logarithmic barrier family of problems the so called "centralpath" for linear programming, we propose a new framework of primal-dual infeasible interiorpoint method for linear programming problems. Without the strict convexity of the logarithmic barrier function, we get the following results: (a) if the homotopy parameterμcan not reach to zero,then the feasible set of these programming problems is empty; (b) if the strictly feasible set is nonempty and the solution set is bounded, then for any initial point x, we can obtain a solution of the problems by this method; (c) if the strictly feasible set is nonempty and the solution set is unbounded, then for any initial point x, we can obtain a (?)-solution; and(d) if the strictly feasible set is nonempty and the solution set is empty, then we can get the curve x(μ), which towards to the generalized solutions.     

磺化聚苯醚离聚体的合成及溶液性质研究

合成一系列磺化度的磺化PPO(S-PPO),以磺化度为20.9mol％的S-PPO的钠盐和锂盐为代表,研究其在四氢呋喃/甲醇混合溶剂中的离聚体行为。结果表明,S-PPO离聚体在溶液中的链聚集状态与聚合物浓度、反离子半径和温度密切相关。     

钨青铜型铌酸钡钠晶体生长条纹的结构成因与克服途径

作者通过对类钙钛矿和钨青铜型结构晶体生长条纹的分析和观测研究,认为这类晶体属于未填满型结构,存在着结构空位,因而易于在晶体生长过程中引起杂质或其它多余组份进入结构空位而形成生长条纹。这类生长条纹将严重影响晶体的光学质量。实验表明,可以采用掺入少量无害元素,如硼(B_2O_3)填占BNN晶体的空位结构以克服生长条纹,取得了初步成效。     

STUDIES ON MISCIBILITY OF POLY (ε-CAPROLACTONE) AND ALIPHATIC POLYCARBONATE BLENDS AND DETERMINATION OF THEIR INTERACTION PARAMETER*

In this paper the miscibility of poly (ε-caprolactone) (PCL) and aliphatic polycarbonate (APC) is studied by using DSC. The results show that PCL and APC are miscible in all ranges of composition. The interaction parameter between the polymers is calculated from the melting point depression data. Using optical microscope, the shapes of the PCL spherulites in the blends are observed.     

聚苯醚羧酸盐的聚集态结构

本文用热学、力学和散射方法研完了聚苯醚羧酸盐的链结构、羧化聚苯醚(C-PPO)在二氧六环溶液中用0.5 NaOH或CsOH的醇水溶液中和成钠型或铯型的C-PPO离聚体,用DSC测定一系列羧酸盐含量的C-PPO离聚体的玻璃化转变温度得到形成离子微区的临界阳离子浓度约为5mol％;动态力学谱中在高于玻璃化转变温度域出现的α松弛峰亦证明了微相结构的存在;SAXS结果表明其离子微区的尺寸约为30(?),其尺寸大小和离聚体中阳离子浓度无     

不同的偶联剂处理木纤维对木纤维和低密度聚乙烯复合材料力学性能的影响

本文对木纤维作增强填料填充低密度聚乙烯（LDPE）所获得的生物降解复合材料力学性能进行了研究．分别用四种不同的偶联剂：改性钛酸酯类偶联剂TC－POT、TC－PBT和硅烷类偶联剂γ-（2，3环氧丙氧基）丙基三甲基硅烷（KH－560）、甲基乙烯基硅烷（205－Silane）处理水纤维，经实验发现用改性钛酸酯类偶联剂TC－POT、TC-PBT处理的木纤维对低密度聚乙烯（LDPE）具有较好增强作用，所组成的复合材料具有较好的力学性能．本文也研究了不同偶联刘含量处理木纤维对复合材料力学性能的影响。