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临界
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    Test Circuit for the Rise Rate of Forward Voltage -of KP Type Transistor Thyratron
    KP型晶闸管临界正向电压上升率测试电路分析
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    CRITICAL-CURRENT ANISOTROPY OF c-AXIS-ORIENTED Bi(2223)/Ag TAPES
    c轴取向的Bi(2223)/Ag带的临界电流各向异性
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    Introduction was made to a kind of latest discontinuous conduct mode boundary(DCM Boundary)active power factor correction(APFC)controller MC34262’s main features with discussion stress on the design process of its applicable circuit.
    介绍了一种最新的临界断续导电模式DCM Boundary的有源功率因数校正APFC控制器MC34262的主要特点,并重点讨论了其应用电路的设计过程。
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    High-Tc superconducting YBa2Cu3O7 sample were sintered from Y-Ba-Cu-O powders prepared by Sol-Gel method. Pressing the powders into pellet, then heated at 960℃ followed by slowly cooling to anneal for a long time. The superconducting transition temperature was 92K.
    用溶胶-凝胶法制取的Y-Ba-Cu-O粉体作为原料,压制成型并经960℃高温烧结及缓慢冷却,可以制备得到高温超导的YBa2Cu3O7样品,其超导临界转变温度为92K,无外磁场的液氮温度条件下的临界电流密度为400A/cm2。
    It was shown that the Jc values reach 5.87×105A/cm2 (10K, OT) and 1.06℃105A/cm2 (5K, 3.5T), respectively.
    采用PPMS测试样品的磁滞回线并由Bean模型计算出线材的临界电流密度, 在10K,0T和5K,3.5T下Jc值分别为5.87×10SA/cm2 和1.06×105A/cm2。
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Relations between the properties of Pb-PbO-Pb Josephson junctions and O2 pressure. oxidation time and humidity in forming tunnel junctions by the ther- mal oxidation are studied. Typical tunnel junctions can be obtained at 2×10-2 -329 torr. of O2 pressure in 2-100 min. of oxidation. Variety of the critical current and other parameters of junctions is sensitive to O2 pressure and oxida- tion time.

本文研究了用热氧化法制作约瑟夫森隧道结工艺过程中氧气压力、湿度、氧化时间对隧道结性能的影响。在我们所使用的氧气压力2×10-2乇—400乇及氧化时间2分钟—100分钟的范围内都可以得到典型的约瑟夫森隧道结,但氧气压力和氧化时间对临界电流及结的其他参量有明显影响。 约瑟夫森器件已有许多应用。而制结工艺是实际应用中首先要解决的问题,由于要的势叠层很薄(10A—30A),实际制作有很多困难。我们用热氧化法形成势叠,得到了较好的成品率。

The flexible damped support-rotor systems have, in the recent years, been gradually adopted in the design of aeroengines instead of the earlyrigid support-rotor systems. The purposes of using the flexible damped support structure are to vary resonant frequency and diminish response of vibration.To this end, the parameters of the dynamic characteristics must provide a suitable conjugation between the support and the rotor. That will inevitably entail a great number of computations and tests. The mechanical impedance...

The flexible damped support-rotor systems have, in the recent years, been gradually adopted in the design of aeroengines instead of the earlyrigid support-rotor systems. The purposes of using the flexible damped support structure are to vary resonant frequency and diminish response of vibration.To this end, the parameters of the dynamic characteristics must provide a suitable conjugation between the support and the rotor. That will inevitably entail a great number of computations and tests. The mechanical impedance method is a very simple and effective means of predetermining the critical speed and the vibration damping characteristics of the rotor-flexible damped support system.This paper analyses the impedance method for the critical speed of the rotor support systems as studied abroad and presents a subsystem impedance method with supposed impedance values at the coupling points of the rotor and the support. It effectively resolves the problem of predetermining the critical speed of the rotor system with double flexible damped supports.This paper also presents a simple way to determine the resonant frequency by means of the curves.

近二十年来,航空燃气涡轮发动机转子系统的弹性支承设计已逐步取代了早期的刚性支承设计。采用弹性阻尼支承结构的目的是调频与减振。为此,支承与转子的动态特性参数必须有良好的匹配,这就需要进行大量的计算与试验。机械阻抗分析法是预示转子—弹性阻尼支承系统的临界转速及其减振特性的简便有效的手段。 本文在国外关于转子支承系统临界转速的阻抗分析法的基础上,提出转子在与支座交联点上假设阻抗的子系统阻抗分析法,有效地解决双弹性阻尼支承的转子系统临界转速的预示。 给出一系列交联点上的假设阻抗值,由转子子系统的频率方程求得转子子系统相应的共振频率特性。弹性阻尼支座的位移阻抗特性可由计算或试验确定。在平面直角座标系中,转子子系统与支座子系统的特性曲线交点,便是整个系统的共振频率。文中还提出了由曲线图确定共振频率的简易方法。

The present paper describes the calorimetric method of ac loss measurement of superconducting magnet and it is apparatus. We have made calorimetric measurements of the ac field amplitude dependence of the frequency dependence of the overal losses of multifilament superconductor, as well as the frequency dependence of the ac critical field amplitude for NbTi-Cu composite and NbTi-Cu-CuNi composite.

本文介绍了用热学测量超导磁体交流损耗的装置和方法.对NbTi三组元和NbTi二组元磁体给出了损耗与交变场幅值、频率,以及磁体的交流临界磁场与频率间关系的测量结果。

 
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