面向对象的稀土永磁同步电动机CAD系统

稀土永磁同步电动机结构复杂，设计计算量大。采用可视化的编程工具C＋＋Builder 6所开发的稀土永磁同步电动机CAD系统提出了一种直接设计法，可有效地完成电动机的电磁设计。介绍了该系统的结构、功能、特点及其软件实现方法，并通过一个设计实例，将CAD系统设计结果与实测数据进行比较，证明了CAD系统设计结果的准确性。     

Experimental study on start-up characteristics of loop heat pipes

Loop heat pipes (LHPs) are two-phase heat transfer devices which utilize theevaporation and condensation of the working fluid to transfer heat. It consists of anevaporator, a condenser, a compensation chamber (CC) and vapor and liquid lines. Fig. 1 shows the detailed structure of the evaporator, CC and condenser of a LHP.The basic principles of LHP were introduced in ref. [1]. When LHPs start to work, liquidis vaporized in the vapor grooves, the menisci formed in the wick develop c…     

Studies on the microstructure,optical and electrical properties of organic microcavity devices based on a porous silicon reflector

Due to its low-cost and mature technology, Si has consistently been the mostwidely used semiconductor in microelectronic industry. Nevertheless, as the photolitho-graphic line for integrated circuit devices becomes narrower and narrower, the quantumsize effect appearing in the devices will further limit the development of electronic in-dustry. Si-based optoelectronic integration can increase the operational velocity of inte-grated circuits because photon can propagate three orders faster than …     

Sensitive determination of DNA based on resonance light scattering enhancement of azocarmine G and CTAB

A new method for the determination of DNA was developed with azocarmine G（AG） in the presence of cetyltrimethylammonium bromide（CTAB） by the resonance light scattering （RLS） technique. The synthetic samples were determined with satisfactory results, and the reaction mechanism was also studied. The results show that under the optimum conditions, the weak RLS signal of AG can be enhanced by DNA, which results from the formation of a new ternary complex AG-CTAB-DNA with large size. Moreover, the enhanced RLS intensity at 552 nm is directly proportional to the concentration of DNA in the range of 0 - 1.0 μg/mL for fish sperm DNA （fsDNA） and 0 - 1.5μg/mL for calf thymus DNA （ctDNA）. Based on this, a new assay of DNA can be established. The detection limits （3σ） are 2. 1 ng/mL for fsDNA and 2.2 ng/mL for ctDNA, respectively.     

Effect of High-energy Ball Milling on Synthetic Reaction in Al-TiO2-C System

High-energy ball milling has a great influence on the temperature characters of synthetic reaction in Al-TiO2-C system by changing the size,distribution state and wet ability of reactants.Reaction temperature characters（reaction ignition time,ignition temperature time.the maximum temperature and temperature rising rate）were changed by different milling time.The longer the milling time.the earlier the reaction.the quicker the temperature rise and the higher the maximum temperature.When the milling time exceeded 10 hours,the reactivity of reactants was so high that the synthetic reaction could take place at 850℃ directly without a long time pretreatment at 670℃.The microstructure of synthetic composites became uniform and the reinforced particles（TiC and α-Al2O3）became fine with milling time increasing.     

工艺参数对冷坩埚连续铸造Ti6Al4V表面的影响

为消除冷坩埚连续成形钛合金铸棒表面缺陷，了解工艺参数对表面质量影响规律，并制备出无裂纹铸棒，通过正交试验和理论分析的方法，研究了不同工艺参数对表面质量的影响，研究表明：表面质量随功率和线圈匝数的增加而变坏，随抽拉速度和拉锭高度的增加先变好后变坏；各参数影响程度不同，线圈匝数影响最大，功率次之，抽拉速度再次，拉锭高度影响最小；铸造表面质量良好钛合金棒的工艺参数为：抽拉速度5mm／min，功率50kW，线圈3匝，拉锭高度30mm。     

Influence of Rare Earth Elements on Luminescent Properties of Y2SiO5 ： Tb

Photoluminescent （PL） and cathodoluminescent （CL） properties of rare earths （Sc^3＋ , La^3＋ , Gd^3＋ and Lu^3＋ ） doped （Y0.97Tb0.03）2SiO5 were studied. Rare earth doping clearly influences PL and CL properties of Y2SiO5 ： Tb. For La^3＋ doped system, PL intensity increases nearly 10 % at x = 0.05 whereas for Lu^3＋ doped system, the intensity increases about 20% at x = 0.20. Gd^3 ＋ doping and Sc^3＋ doping reduce the intensity; at x = 0.3, it is reduced about 30% for Gd^3＋ doped system and about 15 % for Sc^3＋ doped system, respectively. Quenching concentration of activator became higher in rare earth doped samples, which may be understood by that the rare earth dopants might dilute the concentration of the activator. Additionally, doping also influences the color saturation of Y2SiO5 ： Tb. Sc^3＋ , La^3＋ , and Gd^3 doping improve the color saturation, whereas Lu^3＋ doping decreases the color saturation. CL measurements show that CL intensity increases for all rare earths doped systems. The energy transfer from Gd^3＋ to Tb^3＋ was discussed.     

轧辊表面形貌与电加工参数关系的研究

分析了衡量冷轧钢板和毛化轧辊的主要表面形貌参数,通过实验研究了电火花加工参数对表面形貌的影响,并建立表面特征参数与电加工参数的关系模型.由于实验材料和实验方法与实际轧辊电火花毛化基本相同,所以所得结果对轧辊表面毛化技术的研究具有实际意义,可以用于轧辊毛化过程的表面形貌预测和控制.     

风机动力型末端在变风量空调系统中的应用

通过对从低温送风技术中发展起来的变风量系统末端--风机动力箱的分析,在实际应用中对比两种型式的该种末端,分析其优缺点,认为这是一种值得在高级办公大楼中优先考虑和推广的系统形式.     

沉管隧道地震响应的三维非线性数值模拟方法及应用

介绍了沉管隧道的传统抗震分析方法,针对上海某沉管越江隧道的非线性地震响应问题,提出了基于显式有限元和高性能计算上的大规模数值模拟仿真方法。建立了包括地基土、沉管隧道以及柔性接头在内的全三维分析模型,单元数和节点数均超过百万。充分考虑到土壤、橡胶等多个对象的材料非线性,以及土体-沉管间、柔性接头-管段间的接触非线性因素,最后利用动态显示算法及其关键技术进行了基于高性能计算机的大规模地震响应分析。计算结果描述了地基土-沉管隧道体系在地震荷载作用下的相互作用和整体变形,同时对沉管及柔性接头等关键部位进行了深入分析,从而为沉管隧道的抗震设计研究提供参考。