双闭环复合控制在轮胎硫化机中的应用

以硫化过程为研究对象,提出了一种分别控制扰动和系统参数变化的新型复合控制方法,并用遗传算法对控制参数进行了优化。通过对其在Matlab/Simulink中进行仿真,与模型参考自适应控制相比较,结果表明该控制方案具有更优良的鲁棒性和可靠性,控制方案简单且可实现在线整定,便于在轮胎企业推广应用。     

铝复合变质处理对M_2铸造高速钢的影响

Ｍ２铸造高速钢加铝复合变质处理后，可减小Ｗ，Ｍｏ元素偏析，加大Ｃｒ元素偏析，改善铸态与热处理后组织中共晶碳化物的形态和分布，提高机械性能。     

聚醚固体电解质锂电池放电性能研究

利用氧亚甲基连接的聚氧乙烯-聚氧丙烯多嵌段共聚物或氧亚甲基连接的聚氧乙烯多嵌段共聚物与高氯酸锂的络合物作电池的电解质,锂片作负极,几种含钒的化合物作正极,组装了全固态二次锂电池.研究了不同正极材料、不同电解质和不同温度对电池短路放电性能的影响以及电池的重复短路放电性能.研究表明,正极材料V_6O_(13)的性能优于Na_(1+x)V_3O_8;电解质(PEO)_n·LiClO_4的性能优于(PEO-PPO)_n·LiClO_4,这与它们的电导率分别为3.2×10~(-3)S·cm~(-1)和2.2×10~(-3)S·cm~(-1)是一致的.     

网格型复合次级直线电机的分析

本文提出适合驱动带式输送机的网格型复合次级直线电机。通过建立回路微分方程组,以矩阵法分析直线电机起动时的性能。理论分析与实践结果吻合。     

自焙炭块在大型高炉上应用十年概况

自焙炭块陶瓷砌体复合炉缸技术在大型高炉上的应用已有10年，总的来说是成功的，但由于自焙炭块自身的特性，应用中也暴露出了一些问题。通过对国内大型高炉应用自焙炭块陶瓷砌体复合炉缸技术的全面调查，分析了该技术的应用前景，提出了改进措施。     

含氮有机物对活性碳纤维还原吸附银的影响

用H3PO4、ZnCl2等活化剂分别制备了两种化学活化的活性碳纤维（HPSACF和ZCSACF）,并通过水蒸汽活化制备了水蒸气活化活性碳纤维（SACF）。研究了它们对水溶液中Ag(NH3)2^ 的还原吸附性能,并与活性碳（AC）的还原吸附进行了比较。不同方法制备的活性碳纤维（ACF）对Ag(NH3)2^ 的还原吸附能力有显著的差异,以磷酸活化法制备的ACF的还原能力最强,而AC有一定的还原吸附能力。含氮有机物的吸附对活性碳纤维或活性碳的还原吸附能力有很大的影响,一般而言,吸附至碳吸附剂上的对硝基苯酚和苯胺可促进AC、SACF和HPSACF的还原能力,且苯胺的促进作用大于硝基苯酚的促进作用。     

Thermal expansion anomaly and spontaneous magnetostriction of Gd2Fe17 compound

Materials with negative thermal expansion have many practical applications. However, these materials are known in only several oxide systems, and when the negative thermal expansion occurs, the contraction is usually small and limited to a narrow temperature range beyond room temperature. For obtaining a compound with negative thermal expansion in broad temperature range, the structural and magnetic properties of Gd2Fe17 compound were investigated by means of X-ray diffraction and magnetization measurements. The Gd2Fe17 compound annealed at 1050 oC had a Th2Zn17-type structure. There existed an anisotropic strong spontaneous magnetostriction and a negative thermal expansion in Gd2Fe17 compound. The average thermal expansion coefficients was =-7.40×10-6/K in the temperature range of 294-453 K and =-1.80×10-5/K in 453-534 K, respectively. The spontaneous magnetostrictive deformation ωS decreased from 4.34×10-3 to near zero with temperature increasing from 294 to 572 K. The spontaneous linear deformation λc was much larger than λa at the same temperature below about 500 K.     

Inhibition of La-Fe-Co-Si compound corrosion in distilled water by sodium molybdate and disodium hydrogen phosphate

A comparative study of Na2MoO4·2H2O and Na2HPO4·12H2O as inhibitors for magnetic refrigeration material La-Fe-Co-Si compound corrosion in distilled water at room temperature was carried out.Moreover,the inhibiting behavior of the mixture of Na2MoO4·2H2O and Na2HPO4·12H2O was investigated.Potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) measurements were applied to study the corrosion behavior of the compound in the absence or presence of different concentrations of these inhibitors under the same experimental conditions.The study revealed that the mixture of 3.0×10–3 kg/L Na2MoO4·2H2O and 5.0×10–3 kg/L Na2HPO4·12H2O was the best inhibitor reaching the value of inhibition efficiency (ε%) up to 93.9%.Polarization curves showed that the studied compounds acted as anodic inhibitors.The potential of zero charge (PZC) of La-Fe-Co-Si compound was determined in distilled water in the absence of the studied inhibitors.Corrosion inhibition mechanisms for inhibitors were proposed in this work.     

系数倍率法测定复方甲硝唑注射液中氯霉素和甲硝唑的含量

建立复方甲硝唑注射液中氯霉素和甲硝唑的系数倍率测定法.用BASIC语言编制程序选择最佳测定波长对,以消除二组分的相互干扰,不经提取分离同时测定复方甲硝唑注射液中氯霉素和甲硝唑的含量.氯霉素的比尔线性范围为9.890-32,13 μg/ml,r=0.9995;甲硝唑的比尔线性范围为10.09-30.28 μg/ml,r=O.9992.复方甲硝唑注射液中氯霉素和甲硝唑的平均回收率和相对标准偏差分别为100.2%,1.1%和100.8%,1.3%.该方法简便、快速、重现性好、准确度高,可用于复方甲硝唑注射液的质量控制.     

高塔熔融喷浆造粒生产尿基复合肥的工艺技术

介绍闻喜复肥公司高塔熔融喷浆造粒生产尿基复合肥的工艺流程、主要设备,重点介绍HZPKJ-020混料加热器、CD-CT3/ZKL造粒机的工作原理及结构;对生产中出现的问题进行针对性的技改情况和效果,使产能、产品质量、技术指标及经济效益达到和超过设计要求;并指出生产中尚存在的问题.