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The investigation of spherical Gouette flow and its stability has begun relatively recently (within the last 10 years) and has evidently been stimulated by applied problems associated with astro and geophysics.


Spin reorientation effects in GdFe3(BO3)4 induced by applied field and temperature


The conditions of highamplitude regular and stochastic dynamic regimes are revealed, and the possibilities of controlling these precession regimes by applied magnetic fields are shown.


The effect of suppression of the hydrogen tunneling modes by applied inhomogeneous elastic stresses is explained by a shift of the energy levels in the adjacent wells caused by the static displacements.


However, these systems cannot by applied without restriction to groups of nonsurgical patients.

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 The lowfreqnency internal friction of 18 Ni maraging steel is measured by an inverted torsion pendulum. When steel is cooled, an internal friction peak of the martensitic transforination appears nearby 165 C. When steel is heated, an internal friction peak of the reverse martensitic transformation appears nearby 700 C.There is a linear relation between the peak valueand T/f (T rate of cooling, ffrequency of vibration). That is, The value of the internal friction is proportional to the quantity of the martensitic... The lowfreqnency internal friction of 18 Ni maraging steel is measured by an inverted torsion pendulum. When steel is cooled, an internal friction peak of the martensitic transforination appears nearby 165 C. When steel is heated, an internal friction peak of the reverse martensitic transformation appears nearby 700 C.There is a linear relation between the peak valueand T/f (T rate of cooling, ffrequency of vibration). That is, The value of the internal friction is proportional to the quantity of the martensitic transformation in a period of vibration. The internal friction value reduced to background value when the measurement was made at steady temperature, and, the decrease in shear modulus was also noticed in the process of martensitic transformation. This internal friction may be considered to be associated with promoting or accelerating glide of interface dislocations of the critical plumule of martensite due to the applied shear stress.  用倒扭摆法测试了18 Ni马氏体时效钢的低频内耗.发现在降温中于165℃附近出现正马氏体相变内耗峯.在升温中于700℃附近出现反马氏体相变内耗峯.内耗峯的高度与T/f(T—温度变化速率,f—振动频率)成线性关系,恒温测量时,相变内耗降为背景值.还观察到相变过程中,切变模量发生软化.我们认为这个内耗是由外加切应力促进或加速接近临界的马氏体胚芽的界面位错滑移所引起.  A canonical biquad structure which consists of single transconductance elements and capacitors is described. This biquad circuit topology is analyzed and various circuits topology and their transfer function, pole frequency, zero frequency and quility factor are given. The gain, frequency and Q of these filters can be controlled, because the value of the transconductance element is controlled with a voltage. As an example, an 8 order 4 section biquad cascaded bandpass filter is designed and simulated with SPICE... A canonical biquad structure which consists of single transconductance elements and capacitors is described. This biquad circuit topology is analyzed and various circuits topology and their transfer function, pole frequency, zero frequency and quility factor are given. The gain, frequency and Q of these filters can be controlled, because the value of the transconductance element is controlled with a voltage. As an example, an 8 order 4 section biquad cascaded bandpass filter is designed and simulated with SPICE programm. The result meets the demand for the design.  本文提出了一种利用单跨导元件和电容器构成的通用二阶滤波电路。列出了各种二阶滤波器的电路结构及其传递函数、零点、极点和Q值的计算公式,比较了各种电路的优缺点。由于单跨导元件的跨导值可由外加电压控制,因此滤波器的增益、频率和Q值也受控制。作为一个例子,设计了一个由四节二次型电路级联而组成的八阶带通滤波器,用SPICE程序进行了模拟计算,其结果达到了设计要求,证明电路可行。  Voltage step and hysteresis effects have been observed for the first time in magnetoresistance measurement in applied magnetic field at 77 K. Analysis is made on this phenomenon by using an affective pinning model of grain and weaklink.  在液氮温区首次观测到由外加静磁场引起的电压台阶与滞后效应,用颗粒和弱连接有效钉扎模型对其进行了分析。分析表明,这是一种类似I—V特性中具有回滞的直流约瑟夫森效应的新现象,与颗粒和弱连接对磁通流动产生的不同钉扎与陷获有关。   << 更多相关文摘 
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