膛线电解加工独立工作齿阴极设计

为解决固定式阴极加工大口径深线槽变缠角膛线出现初始段和变缠角段膛线加宽,产生阳线“塌壁”的问题,采用将工作齿作为分立元件与阴极体做成既有联系又存在相对运动的结构,对阴极结构进行立体几何建模,设计工作齿、导流系统和驱动系统．在阴极体受拉杆牵引作轴向进给和径向运动的同时,由嵌入阴极体内的微电机按程序驱动独立工作齿,按照弹道方程改变,时刻保持与缠角一致.采用此结构可实现阴极齿的高精度切削加工．     

罐头装箱组合式机械手设计

目的研发高效、可装配于工业机器人的罐头装箱机械手,应用于罐头自动包装生产线。方法提出一种组合式机械手,该机械手可同步对罐头和纸板吸取和放置,可实现罐头多层装箱、层与层之间放置纸隔板的工艺要求。结果该机械手适用于圆形罐头和椭圆形罐头的装箱,已应用于果酱、果汁、凉茶、鱼罐头等生产线中,可同时对4个相同规格的纸箱进行装罐及放置隔板,其最大抓取质量达30 kg。结论该机械手设计结构精简,具有多种功能,有效地提高了生产效率。     

参数化图形设计技术及其在组合式空调CAD中的应用

本文论述了一个组合式空调ＣＡＤ系统，文中着重阐述了参数化图形设计原理及其在组合式空调ＣＡＤ中的应用，利用此种方法建立及修改图形方便有效。     

化纤厂专用型组合式空调机组的设计

本文设计了一套新型化纤厂专用型组合式空调机组,详细介绍了该机组的设计方案、设计特点、设计选型计算及自动控制方案等内容.     

真空阴极弧离子镀阴极斑点的移动研究

建立了真空阴极弧离子镀圆形平面靶侧面引弧时 ,阴极斑点的受力模型 ,分析了影响电弧运动的因素 ,改进了圆形平面靶侧面形状 ,大大提高了石墨靶阴极斑点从侧面到靶平面的过渡速度     

JYK型组合式空调机组的设计

本文介绍了JYK型组合式空调机组总体结构和各功能段的设计特点,以及主要性能指标。并提出了今后的改进方向。     

组合式冷却器的设计和开发

针对常规压缩机组机器和设备分离的特点,通过引进国外技术,提出了将冷却器和机架组合成一体的集成化设计思路,并获得了成功。分析组合式冷却器设计、制造中的技术难点和采取的工艺措施,介绍组合式冷却器的优点、换热计算、结构和特点。     

基于标准阴极特性的面齿轮阴极设计方法

目的 解决电解加工过程中,简单曲面阴极设计方法不能保证面齿轮加工精度的问题。方法 利用标准阴极进行正交试验,得出钢制面齿轮的最优电解工艺参数。利用该工艺参数对阴极重新设计,加工试件,根据试件的测量结果对原始阴极进行修形,得出最终阴极形状。结果 通过对正交试验数据进行处理,得出钢制面齿轮的最优电解工艺参数为K=20, U=10 V, v=0.6 mm/min;根据试件的误差测量结果,推导出最优修形数为0.4602。结论 此阴极设计方法所设计的阴极能保证面齿轮的加工精度,而且能够加工出IT7级精度制件,同时为复杂型面的高精度电解加工方案提供了一种可行的阴极设计方法。     

小型组合式冷库设计专家系统

冷库设计中存在大量的符号推理及经验数据的选取，传统程序只能处理精确数据，而对符号推理和非精确性数据无能为力。采用专家系统模型，运用模糊逻辑方法，结合小型组合式冷库的设计实例，模拟专家进行冷库设计中符号推理及选取经验数据，得到了较好的设计结果。     

Nitriding of zirconium cathode for arc-heater testing in air

Zirconium cathodes with a nitrided surface layer are promising candidates for arc-heater tests in air because of their good erosion resistance and excellent physical properties. Nitriding of a zirconium cathode is performed by a microwave plasma generator. Nitrided cathodes yield a stable plasma flow of argon-air up to 80 A at a maximum flow rate of 4 l/min argon and 0.8 l/min air for a long duration. The specific input power corresponds to 11.8 MJ/kg. During arc-heater testing, nitriding is a governing reaction and golden zirconium nitride is formed at the tip of the cathode surface. The formation mechanism of a ceramic layer during microwave plasma generator treatment and arc-heater testing will also be discussed.     

Topology optimization for free vibrations using combined approximations

This study shows how the Combined Approximations (CA) can be used for reducing the computational effort in Topology Optimization for free vibrations. The previously developed approach is based on the integration of several concepts and methods, including matrix factorization, series expansion, and reduced basis. In this paper the CA method is used for repeated eigenvalue analysis. Adjoint sensitivity analysis is developed such that the inaccuracies of the approximation are taken into consideration. Several 2‐D and 3‐D numerical examples show how optimal topology designs can be achieved by the reduced computational effort compared with the exact eigenvalue analysis. Copyright © 2009 John Wiley & Sons, Ltd.     

LiCoxNixMn2-2xO4-xFx(x=0.05、0.10)的合成与性能研究

采用混合溶剂共沉淀法,通过掺杂Co和Ni双阳离子,同时引入F^-阴离子对LiMn2O4尖晶石进行多元掺杂,合成了LiCoχNiχMn2-2χO4-xFχ（χ=0.05、0.10）。XRD分析表明掺杂后LiMn2O4尖晶石正极材料仍保持尖晶石结构。电化学性能测试表明多掺杂尖晶石具有很好的循环性。其中,在3.2～4.4V电压范围内,以电流密度100mA/g的条件下正极材料LiCo0.05Ni0.05Mn1.9O3.95F0.05的初始容量为83.04mAh/g,30次循环中平均每次循环比容量损失约0.18％。电化学测试表明,多元掺杂可以有效改善充放电平台。     

锂离子电池硅基负极材料研究进展

由于硅负极不能在商业上大规模应用,研究者采用多种改性制备方法,提高硅基负极材料初始放电容量和循环性能。综述了近年来改善硅基负极材料性能的几种制备方法,指出了硅基材料作为锂离子电池负极材料的研究前景。     

Comparison of some metrological characteristics of hot and cold cathode ionisation gauges

Five commercial vacuum gauges, including three hot cathode gauges and two inverted magnetrons, were tested against a primary high-vacuum standard over the range 10⁻⁷–10⁻³ Pa with gases of N₂, Ar, He and H₂. In a continuous observation for 72 h, hot cathode gauges had better stabilities than inverted magnetrons in N₂, Ar and He, but all gauges behaved similarly in H₂. Repeated calibrations over a period of about 6 months showed that all gauges had similar stabilities in N₂, Ar and He. For H₂, however, the stability of the inverted magnetrons was better than that of the hot cathode gauges. For different gases, the discontinuities of the inverted magnetrons occurred at different pressures. For the hot cathode gauges the changes in relative sensitivities with pressure were small in a wide pressure range, but for the inverted magnetron gauges the changes were strongly pressure dependent. The starting times of the inverted magnetrons varied with pressures, gases and ionisation sources in the system. For the inverted magnetrons, the outgassing rates were much lower than that of the hot cathode gauges, but their pumping speeds were similar to that of a hot cathode gauge with an emission current of 10 mA. Some reasons, which influenced the metrological characteristics of the gauges tested, are also discussed.     

固体氧化物燃料电池多层复合阴极的制备及性能研究

为了改善固体氧化物燃料电池的阴极热循环性能,采用喷涂方法在Ce0.8Sm0.2O1.9（SDC）电解质片的表面制备了La0.6Sr0.4Co0.2Fe0.8O3（LSCF）-（SDC）3层复合阴极,各层LSCF所占比例依次为40%、70%和100%（质量分数）.X射线衍射结果表明,LSCF与SDC无明显的反应.每层材料的热膨胀系数随LSCF含量的增加而增大,电阻率随LSCF含量的增加而下降.SEM观测证明阴极呈现多孔的微结构,且与电解质表面接触良好.在中温（500～800℃）测得的阴极极化曲线和阻抗谱结果表明,多层阴极材料具有比单层LSCF阴极更好的电化学性能和热循环稳定性,5次热循环后性能衰退从58%下降到12%.     

Spinel-layered integrate structured nanorods with both high capacity and superior high-rate capability as cathode material for lithium-ion batteries

Spinel phase LiMn2O4 was successfully embedded into monoclinic phase layeredstructured Li2MrnO3 nanorods,and these spinel-layered integrate structured nanorods showed both high capacities and superior high-rate capabilities as cathode material for lithium-ion batteries (LIBs).Pristine Li2MnO3 nanorods were synthesized by a simple rheological phase method using α-MnO2 nanowires as precursors.The spinel-layered integrate structured nanorods were fabricated by a facile partial reduction reaction using stearic acid as the reductant.Both structural characterizations and electrochemical properties of the integrate structured nanorods verified that LiMn2O4 nanodomains were embedded inside the pristine Li2MnO3 nanorods.When used as cathode materials for LIBs,the spinel-layered integrate structured Li2MnO3 nanorods (SL-Li2MnO3) showed much better performances than the pristine layered-structured Li2MnO3 nanorods (L-Li2MnO3).When charge-discharged at 20 mA·g-1 in a voltage window of 2.0-4.8 V,the SL-Li2MnO3 showed discharge capadties of 272.3 and 228.4 mAh.g-1 in the first and the 60th cycles,respectively,with capacity retention of 83.8％.The SL-Li2MnO3 also showed superior high-rate performances.When cycled at rates of 1 C,2 C,5 C,and 10 C (1 C =200 mA·g-1) for hundreds of cycles,the discharge capacities of the SL-Li2MnO3 reached 218.9,200.5,147.1,and 123.9 mAh·g-1,respectively.The superior performances of the SL-Li2MnO3 are ascribed to the spineMayered integrated structures.With large capacities and superior high-rate performances,these spinel-layered integrate structured materials are good candidates for cathodes of next-generation high-power LIBs.     

Electrical and optical properties of ITO:Ca composite thin films for TEOLED cathode

ITO:Ca composite thin films were deposited on glass substrate by the rf magnetron co-sputtering method with various numbers of Ca chips and oxygen partial pressures. The carrier concentration of the ITO:Ca thin film was 7 × 10²⁰ cm^− 3 when the number of Ca chips was 4 at an oxygen partial pressure of 1.4%. The sheet resistance and optical transmittance of the ITO:Ca thin films were 68.2 Ω/sq. and 87%, respectively. The work function of the ITO:Ca thin films with 8 Ca chips was changed from 4.6 eV to 5.0 eV when the oxygen partial pressure was increased from 0.8% to 2.2%. When the oxygen partial pressure was 1.2%, a low work function of 4.6 eV was obtained for the ITO:Ca thin films.     

微米级沟槽表面薄膜的制备及减阻性能研究

采用轮毂热压工艺,制备一种表面有规则微米级沟槽结构的薄膜。利用白光干涉表面形貌仪对薄膜表面形貌检测,结果表明采用此工艺制备的薄膜可获得形貌构型可控的微米级沟槽结构。通过热压轮毂形状参数,控制微米沟槽形貌构型。经航天部FD06风洞的测试,证实微米级沟槽表面薄膜在高速空气流中,诱发二阶涡流,显著降低固汽界面间剪切作用和摩擦阻力,具有显著的减阻效果。