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These results are quite remarkable since these algebras do not admit appropriate sl2triples.


When one expands a Schur function in terms of the irreducible characters of the symplectic (or orthogonal) group, the coefficient of the trivial character is 0 unless the indexing partition has an appropriate form.


It is shown that this is possible when the window g ε L2(?) generating the WeylHeisenberg frame satisfies an appropriate regularity condition at the integers.


In particular, the results in this article show that the oscillations of a function at large scale are comparable to the oscillations of its samples on an appropriate discrete set of points.


Under the appropriate definition of sampling density D?, a function f that belongs to a shift invariant space can be reconstructed in a stable way from its nonuniform samples only if D?≥1.

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 This paper presents a method of determining the actual average temperature rise of the stator winding of a highvoltage a.c. machine, by measurigthe resistance of that winding under load by means of Kelvin bridge. The method discussed herein has the following special features:1) The installation for measurement is at zero potential, so that safety is assured in operation,2) By taking appropriate measures, disturbance of the a.c. components is Kept away from the bridge circuit, so that the installation... This paper presents a method of determining the actual average temperature rise of the stator winding of a highvoltage a.c. machine, by measurigthe resistance of that winding under load by means of Kelvin bridge. The method discussed herein has the following special features:1) The installation for measurement is at zero potential, so that safety is assured in operation,2) By taking appropriate measures, disturbance of the a.c. components is Kept away from the bridge circuit, so that the installation of a complicated filter in the galvanometer circuit can he omitted. While the galvanometer still operates steadily.3) A unified method for choosing measuring elements can he applied to various ratings of machines.4) High accuracy of measurement is assured. The maximum error of resistance measurement is within 0.3%, if proper measuring elements were chosen.In the paper the result of measurement and its error are analyzed.  在本文中讨论了一种用双臂电桥测量高压交流电机在运行时的定子绕组电阻,从而得到定子绕组实际平均温升的方法。这种方法的特点是: 1.测量装置处于零电位,保证了操作的安全。 2.采取了适当的措施,将交流干扰消除在电桥线路之外。这样就避免了在检流计回路中采用复杂的滤波装置,而检流计仍能稳定工作。 3.对各种不同的电机可用统一的测量元件选择方法。 4.这种方法保证了较高的测量准确度。当合理选用测量元件时,电阻测量的最大误差可在0.3％以下。 文中分析了电阻测量结果及其误差,还列举了一些试验结果。  In this paper, the unequalpitch single layer windings are proposed for large hydroelectric generators with direct watercooling for the purpose of greatly increasing the number of possible schemes of windings, thus improving the selection of the best scheme by comparison. The design process of the unequalpitch singlelayer windings and the harmonic analysis of winding MMF are described. Existing difficulties in constructing this kind of windings are pointed out, and appropriate methods of overcoming... In this paper, the unequalpitch single layer windings are proposed for large hydroelectric generators with direct watercooling for the purpose of greatly increasing the number of possible schemes of windings, thus improving the selection of the best scheme by comparison. The design process of the unequalpitch singlelayer windings and the harmonic analysis of winding MMF are described. Existing difficulties in constructing this kind of windings are pointed out, and appropriate methods of overcoming them are suggested. By means of these methods, the unequalpitch singlelayer windings will be made useful in practical applications as they now have the same technological properties as the equalpitch singlelayer windings. "The simplest unequalpitch singlelayer windings" achieved merely by adding a few askew jointSleeves are recommended. Such windings with 672 slots and 110 poles are dealt with in detail as a typical example.  本文提议在直接水冷的大型水轮发电机上采用不等距单层绕组,使绕组的可能方案数大大增加,以便分析比较而从中选择出最佳方案。文中论述了不等距单层绕组的设计方法和磁势谐波的分析法,指出这种绕组存在的问题并提出其解决办法。在采取各种措施之后,不等距单层绕组可以做到和等距单层绕组具有相同的工艺性,因此富有现实意义。对于一些只需少量斜并头套就可完成接线的“最简易的不等距单层绕组”更是值得推广。文中对672槽110极绕组进行了详细的分析、计算,作为不等距单层绕组的一个典型例子。  The contradictory relation and requirement of turnoff and turnon time in constructing a 20 KC 100A thyristor are discussed. When the turnoff time is controlled within 35μs, and the turnon time is controlled about 2μs., most of the devices can work satisfactorily. A simple gate structure having a larger cathode area is recommended. The increased value of the long base region resistivity of the pellet after the gold diffusing is measured and with the appropriate technology the blocking voltage of the... The contradictory relation and requirement of turnoff and turnon time in constructing a 20 KC 100A thyristor are discussed. When the turnoff time is controlled within 35μs, and the turnon time is controlled about 2μs., most of the devices can work satisfactorily. A simple gate structure having a larger cathode area is recommended. The increased value of the long base region resistivity of the pellet after the gold diffusing is measured and with the appropriate technology the blocking voltage of the pellet using the 250μ 20Ω cm silicon slice can reach 1200V.  本文讨论了２０千周正弦波１００安可控硅元件的关断和开通时间的对立统一关系和要求。 当关断时间控制在３到５微秒，开通时间控制在２微秒时，多数元件都能满意地工作。为增 加阴极面积，介绍了一个简单的控制极结构，测定了扩金后管芯长基区电阻率的增长情况， 选用厚度２５０微米、２０欧姆·厘米的硅片制成元件后的阻断电压达到１２００伏。   << 更多相关文摘 
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