1986年哈雷彗星的分裂

1986年3月25日在新西兰John 山天文台拍摄的9张照片,显示出哈雷彗星的彗核分裂成相隔甚远的两个分立彗核。投影在天空切平面上的分离距离约为5×10³km。主核和小伴核都呈现有它们自身的彗发。伴核有一个高达几千公里的突出喷流,而且伴核必定在数天以内即消失不见。结合陈培生等的光电观测结果,看来分裂与一个爆发事件相关。并对有些照片作了数字成像增强处理。     

论引力波探测器方位与引力波源方位间的关系

本文从计算棒状引力波天线的指向性函数出发,讨论了引力波源的方位和天线棒方位之间的关系,找到了从符合实验数据求出引力波源方位以及利用单一引力波探测器对连续引力波源的定位方法。所得的结果也适用于其他形式的一维引力波天线。一旦引力波探测器的灵敏度达到足以确定引力波强度时,本文的结果无疑对引力波天文学将是很有意义的。 关键词：     

非局部源耦合抛物方程组中的奇性传播

讨论一个经由非局部源耦合的非线性抛物组的解的奇性传播. 给出解的4种可能的blow-up速率及相应的边界层估计. 还得到此非线性抛物组的临界指标.     

Experimental Study of Four-Wave Mixing in Semiconductor Laser Amplifier and its Application to Dispersion Compensation in Mid-Span Spectral Inversion System

Properties of four-wave mixing (FWM) in the semiconductor laser amplifier are studied experimentally in this paper. The optical phase conjugation of the mixing wave is applied to compensate the chromatic dispersion of transmission fiber. It is presented experimental results of the transmission of short optical pulses with 12-ps width over 204 km standard single mode fiber. The results confirm that mid-span spectral inversion (MSSI) employing FWM in a semiconductor laser amplifier is one of potential dispersion compensation techniques for optical transmission over standard single mode fiber with bit rate beyond 40Gb/s.     

苦参提取液中黄酮类化合物的抑菌作用

为探讨苦参中黄酮类化合物体外抑菌活性,采用乙醇回流法从苦参中提取含黄酮类化合物并用分光光度法在510 nm处测定黄酮含量.同时,采用琼脂扩散法研究了苦参黄酮类化合物对2种细菌和3种真菌的抗菌性能,测定了其最小抑菌浓度.结果表明:浓度为0.556 g/L的苦参黄酮类化合物对金黄色葡萄球菌、大肠杆菌抑菌圈直径分别为11,8 mm,对啤酒酵母菌、黑曲霉和产黄青霉的抑菌圈直径分别为11,9,9 mm;苦参黄酮类化合物对金黄色葡萄球菌、大肠杆菌、啤酒酵母菌、产黄青霉、黑曲霉的最小抑菌浓度分别为5.6×10-3,0.56,0.28,0.56,0.56 g/L.由此得出结论,苦参中黄酮类化合物对细菌和真菌都有抑制作用,对革兰氏阳性菌的作用强于革兰氏阴性菌,对单细胞真菌作用强于丝状真菌.     

The Influence of the Renormalization Condition to the Equation of State of the Nuclear Matter

In the relativistic σ-ω model, the influences of the parameters b, c, d in the potential U(σ) = (1/2!)bo2 - -(1/3!)cσ3 (1/4!)dσ4 to the incompressibility, effective mass and binding energy of the nuclear matter are studied in detail.The calculation of equation of state of nuclear matter shows that the values of b, c, d depend on the renormalization condition, we also find that a soft equation of state of nuclear matter can be obtained in a suitable renormalization condition, and the experimental incompressibility coefficient can be reproduced. These results are also used to study the thermal properties of hot A-resonant nuclear matter.self-interaction of σ meson, renormalization, hot and dense hadronic matter ``     

托卡马克装置反馈稳定区(Ⅰ)——理论部分

本文给出托卡马克装置中,等离子体电流环水平位移和电流值同时作线性反馈控制时的演化方程,反馈控制稳定性的判据和在小扰动下作线性近似给出CT-6B装置的反馈稳定区的计算结果。 关键词：     

P-twisted affine Lie algebra and its realizations by twisted vertex operators

In this paper, we define a P-twisted affine Lie algebra, and construct its realizations by twisted vertex operators.     

Simplified Scheme for Test of Quantum Nonlocality Without Using Bell Inequality

A simplified scheme is proposed for the test of quantum nonlocality of the type described by Hardy [Phys.Rev.Left.71 (1993) 1665].In the scheme two appropriately prepared atoms are simultaneously sent through a cavity and dispersively interact with the cavity field.Then state-selective measurements are performed on these atoms,which may reveal quantum nonlocality without using Bell inequality.We also propose a simple scheme for the generation of multi-atom entangled states.``     

A Novel Rule Induction Algorithm

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