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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
In the case of 4-dimensional anticommutative algebras a construction is given that links the associated cubic surface and the 27 lines on it with the structure of subalgebras of the algebra.
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For a smooth oriented surface Σ, denote byM(Σ) the set of all ways to represent Σ as a result of gluing together standard spheres with holes ("the Lego game").
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Our proof uses the connection between this variety and the punctual Hilbert scheme of a smooth algebraic surface.
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Assuming that the surface contains two elliptic fibrations that are invariant by non-periodic automorphisms, we give the classification of invariant probability measures.
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The mapping class group of a compact oriented surface of genus greater than
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| | ~~ | | 本文根据实验结果,叙述不同腐蚀剂对于硅的表面复合速度S的影响及其时间稳定性。简短地论述了利用稳定光电导测量S方法的实质,介绍了运算公式及实验设备。指出了在怎样的条件下进行表面处理才能正确测量硅的体寿命。同时也表明了硅的电阻率对表面复合速度的影响。由实验数据证明,在10%的KOH水溶液中进行腐蚀,能够在硅表面上得到较低的复合速度。 | | 文摘来源 | | This paper reports the results of some experimental work on the csium atomic beam system used in csium atomictron. In the system, a simple canal structure of csium oven was obtained by the use of a stack of hypodermic needles. The result of the tests showed that the angular distribution of the csium atomic beam depends upon the temperature of the oven, at 200 the half-intensity angle being 1. 5°. With platinum filament replacing the tungsten filament in the detector the results indicated a lower backg... | | 本文报道用于铯原子钟的铯原子束系统的某些实验研究结果。在这系统中利用“皮下针”1)堆积方法得到一种简便的铯灯通道结构。测试结果表明,铯原子束角分布曲线与铯灯温度有关。在200℃下,半强度角为1.5°。采用铂丝代替钨丝做成铯原子检测器。试验表明,它具有很小的本底离子流(在工作温度1255°K时,本底离子流为1×10-14A),而表面离化系数与钨丝相近。 | | 文摘来源 | | The effects of sample dimensions, surface recombination velocity and the ponetrati- ng length of the illuminating light on the high order modes in photoconductive decay of excess carriers in semiconductor have been studied. It was found that the role of the high order modes can be considerably minimized by using penetrating light, sample of large size and low surface recombination velocity. The bulk lifetime of the filament can than be more accurately determined. | | 观察了样品几何尺寸、表面复合速度及光的贯穿程度,对半导体少数载流子光电导衰退中高次模的影响。在测量时使用贯穿光、大尺寸样品、及使样品表面复合速度较低时,高次模的作用可以减少,因而能准确测得体寿命。 | | 文摘来源 | |   | | << 更多相关文摘 |
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