突变扭矩激励下转子系统横振响应

针对细长轴的转子系统的特点,建立了突变扭矩激励下的转子系统动力学模型,对该模型进行了求解和仿真;分析了仿真得到的轴心位移的时域和频域波形.结果表明,在突变扭矩激励下转子系统的轴心位置发生偏移.偏移量随着扭矩增大而增大,轴心轨迹也受到影响.在受激励的初始阶段,轴心轨迹很不稳定.随着扭矩趋于稳定,轴心轨迹逐步趋于稳定.最后...     

中镍铬合金铸铁的激光熔覆修复研究

本文是利用转镜扫描技术得到的线光斑对中镍铬合金铸铁窄带激光熔覆,为了减少试验次数,并排除不必要的试验参数,用正交试验法对激光熔覆处理效果的最大影响因素(P、V、B或D)进行试验方案设计.最后对试验结果进行分析比较获得最佳工艺参数.     

电致变色灵巧窗的设计与研制

从电致变色器件的工作原理出发，对电致变色灵巧窗的基本结构和各层材料的作用进行分析和讨论，对组成灵巧窗的各层薄膜材料进行研究和制备，并研制了性能优良的ＩＴＯ／ＷＯ３／ＬｉＣｌＯ４－ＰＣ／ＮｉＯ／ＩＴＯ以及ＩＴＯ／ＮｉＯ／ＬｉＣｌＯ４－ＰＣ／ＩＴＯ结构的半固态灵巧窗和ＩＴＯ／ＷＯ３／ＬｉＮｂＯ３／ＮｉＯ／ＩＴＯ结构的全固态灵巧窗。     

百万等级超超临界汽轮机主要部件切削性能研究

通过对相同材料的试件的切削试验研究,确定了加工刀具的材料、刀具的几何角度、切削参数等关键要素,解决了不锈钢、镍基高温合金等难切削材料的加工难题,为百万等级超超临界汽轮机主要部件的加工制造提供了正确的工艺参数。     

关于镍渣提铁生产的高温热能利用的探讨

通过对镍弃渣的性能分析，提出了两种利用镍弃渣生产微合金铁的方法，既可以解决镍渣中铁和有价金属的回收，达到资源综合利用的目的，又解决了高温熔融镍渣的热能回收问题，节约能源。     

Reaction mechanism and kinetics of lithium ion battery cathode material LiNiO2 with CO2

The reaction between LiNiO₂ and CO₂ is relevant to the synthesis and storage of LiNiO₂-based cathode materials for lithium ion batteries. In this work, this reaction was investigated in pure CO₂ atmosphere at both room and high temperatures. The reaction products (Li₂CO₃, NiO, and O₂) and activation energies were determined by means of XRD, XPS, MS and TGA techniques. The reaction mechanism was explored in an effort to clarify some inconsistencies in the previous works. Kinetics analysis was also carried out to understand the reaction process relevant to the synthesis and storage of LiNiO₂ cathode material.     

Photoinduced piezooptical changes caused by microsecond CO2 Infrared lasers in lead-germanate rare earth tridoped glasses

We have observed substantial influence of the illumination by 3.5 μs CO₂ laser on the piezooptical coefficients of 59 PbO - 41 GeO₂ (in wt.%) glasses prepared with Tm₂O₃, Er₂O₃, Yb₂O₃ using the following concentrations (in wt.%): B-Tm₂O₃ (0.5)/Yb₂O₃ (1.0)/Er₂O₃(0.5); C-Tm₂O₃(0.5)/Yb₂O₃(1.0)/Er₂O₃ O(1.0); D-Tm₂O₃ (0.5)/Yb₂O₃ (1.0)/Er ₂O₃ (2.0). We have found that the maximal changes were observed for B samples that contain the lowest concentration of Er₂O₃. The maximal changes are observed around 360 nm near the fundamental absorption edge. There exists some correlation between the maximal intensities of the photoluminescence and the maximal piezooptical changes. The CO₂ lasers cause preliminary photothermal changes. The existence of the maxima may be caused by a competition between the phonon and anharmonic phonon subsystems, which are very sensitive to the temperature.     

Efficient removal of heavy metal ions from aqueous solution using salicylic acid type chelate adsorbent

In this study, 5-aminosalicylic acid was successfully grafted onto the poly(glycidyl methacrylate) (PGMA) macromolecular chains of PGMA/SiO₂ to obtain a novel adsorbent designated as ASA-PGMA/SiO₂. The adsorption properties of ASA-PGMA/SiO₂ for heavy metal ions were studied through batch and column methods. The experimental results showed that ASA-PGMA/SiO₂ possesses strong chelating adsorption ability for heavy metal ions, and its adsorption capacity for Cu²⁺, Cd²⁺, Zn²⁺, and Pb²⁺ reaches 0.42, 0.40, 0.35, and 0.31 mmol g⁻¹, respectively. In addition, pH has a great influence on the adsorption capacity in the studied pH range. The adsorption isotherm data greatly obey the Langmuir and Freundlich model. The desorption of metal ions from ASA-PGMA/SiO₂ is effective using 0.1 mol l⁻¹ of hydrochloric acid solution as eluent. Consecutive adsorption-desorption experiments showed that ASA-PGMA/SiO₂ could be reused almost without any loss in the adsorption capacity.     

A new approach for preparation of oil-soluble bimetallic dispersed catalyst from layered ammonium nickel molybdate

A new route via the coating of layered ammonium nickel molybdate with oleic acid was developed to prepare an oil-soluble bimetallic dispersed catalyst for the hydrocracking reaction of heavy oil. The layered ammonium nickel molybdate, termed Ni-LTM precursor, was synthesized by precipitation, and the NiMo oleate complex was prepared with the oleic acid serving as an organic ligand. The prepared materials were characterized with X-ray diffraction, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. It was found that the oleic acid is chemisorbed as a carboxylate onto the Ni-LTM nanoparticles, specifically on Ni-O bond. Also, the catalytic activities were compared between the NiMo oleate complex and other ordinary monometallic dispersed catalysts. The NiMo oleate complex showed excellent catalytic activity, demonstrating its potential to be applied as a novel dispersed catalyst.     

超细镍粉的制备及还原生长机理研究

以联氨为还原剂,在硫酸镍水溶液中控制液相还原反应条件制备了超细镍粉,并讨论了超细镍粉的还原生长机理.通过实验分析了工艺参数对还原反应的影响,采用X射线衍射(XRD),扫描电镜(SEM),比表面积测定等分析手段对超细镍粉进行表征,结果表明:超细镍粉的形核和生长独立进行;温度、Ni2+浓度和pH值调控着溶液中镍离子的释放并...