铝靶激光反射率的动态研究

本文分析了强激光作用下铝合金靶表面反射率的时间变化规律。利用转镜调Ｑ钕玻璃激光器和积分球装置对铝ＬＹ１２的表面激光反射率动态变化规律进行了测量，得到了功率密度在１０￣６～１０￣９Ｗ／ｃｍ￣２范围内的相应结果。同时，从金属近自由电子模型－Ｄｒｕｄｅ理论出发，对金属铝的电导率与温度变化关系进行了数值模拟，亦得到了相应的反射率变化规律，实验结果与数值模拟结果基本符合。当激光功率密度更同时（１０￣１１～１０￣１５Ｗ／ｃｍ￣２），由等离子体模型和局部热力学平衡（ＬＴＥ）理论，得到了反射率随温度变化的数值模拟结果，与国外的实验结果符合得较好。     

A PRELIMINARY STUDY ON THE IMPACT OF MESOSCALE IRRIGATION OVER ARID LAND ON MESOSCALE CLIMATE

The present study investigated the modification of mesoscale inhomogeneous distribu-tion of soil wetness, resulting from mesoscale irrigation over arid or semiarid lands in mid-latitude in the later summer or early autumn, on mesoscale climate under conditions withand without synoptic flow influence, using an interactive model between soil and atmo-sphere. The simulations indicated that after a mesoscale irrgation, a wet soil breeze circu-lation was thermally forced, which was, in many features, similar to that of the sea breezecirculation. The influence of synoptic flows on the structure of thermally--induced wet soilbreeze circulation was also discussed.     

PALEOMONSOONS OF CHINA OVER THE LAST 130,000 YEARS——PALEOMONSOON VARIATION

Based upon the effect of land-sea interaction on the paleomonsoon variation and the time series of climatic proxy-indicators, the historical Asian monsoon variation over the last 130,000 and 18,000 years has been reconstructed with an emphasis on the basic characteristics of summer monsoon circulation. The monsoon-climatic cycles and associated model of environmental development over the central and eastern China are proposed and the mechanism of paleomonsoon variation of China preliminarily discussed. The variation of East Asian monsoon circulation should be regarded as a regional result of both solar-radiation changes and the global glacial-interglacial cycles. The episodic uplifting of the Qinghai-Xizang Plateau since the late Miocene has to a large extent controlled the forming and evolution of the paleomonsoon circulation of China.     

PROPERLIES OF ALMOST PERIODIC SOLUTION FOR A KIND OF ECOLOGICAL SYSTEMSWITH TIME DELAY

AMSSubjectClassification34C27Thespatialelementinpopulationbiologyisimportanttounderstandthedynamicsofecologicalsystems.ThetheoreticalworksonthisproblemwerepioneeredbySkellamif]in1951andwerereviewedbyLevin[2]in1974.In12],Levinfirstestablishedthiskindofmode…     

Metal-Support Interaction Which Controls the Oxidation State, Structure and Catalysis of Pd

A metal-support interaction between Pd and various kinds of zeolite and metal oxide supports was studied, which were active in the catalytic combustion and selective reduction of NO. The acid-base properties of supports affected the oxidation state, structure and catalytic activity of Pd. The acid sites of zeolite played the role to anchor the dispersed PdO as evidenced by the dynamic structural change of Pd. It was found that the metal-support interaction is an important factor, affecting the oxidation state, structure and catalytic performance of Pd.     

Evaluation of thermodynamic functions relative to cavity formation in aqueous solutions

The results of calculation of free Gibbs energy and enthalpy of cavity formation were described using the Scaled Particle and Sinanoglu's theories.

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Zusammenfassung Mittels der zitierten Theorien wurden die Resultate der Berechnung der freien Gibbs'schen Energien und Enthalpien für die Hohlraumbildung beschrieben.

     

Hopfield型模型的收敛性

本文考虑Ｈｏｐｆｉｅｌｄ型模型的收敛性问题和吸引子的吸引域的刻画。证明了Ｎ＜＋∞与Ｎ＝＋∞时Ｈｏｐｆｉｅｌｄ模型在几乎处处的意义下收敛于吸引集。当Ｎ＜＋∞时，模型将在有限时间内稳定于某一吸引子上．对于Ｎ＜＋∞与Ｎ＝＋ ∞的情形，分别得到了吸引域的一个集的刻画。     

带交互作用测度值分枝过程的绝对连续性

本文研究Meleard-Roelly（1992，1993）和Metivier（1987）构造的带交互作用的测度值分枝过程的状态性质．我们证明在自然假设下该过程关于Lebesgue测度是绝对连续的，其密度有连续修正且满足一个随机偏微分方程．     

Superthermal Electron Produced in Relativistic Laser-Plasma Interaction

The dynamics of a relativistic electron submitted to an intense, plane wave, linearly polarized laser field is reviewed. Based on the dynamics, the temperature of the electron in the laser field is delined and calculated. It is found that the calculated temperature fits the first temperature observed in the experiment by Malka et al. A model to evaluate the electron temperature by taking the electron-ion scattering into account is proposed. It is found that when I ≥ 4.0 × 101s W/cm2 the electron temperature by considering the scattering, T hs, is evidently larger than the electron temperature without considering the scattering, Th. This result is in favor of explaining the two-temperature distribution of the electron energy observed in the experiment by Malka et al.     

Numerical simulation of Richtmyer-Meshkov instability

The compressible Navier-Stokes equations discretized with a fourth order accurate compact finite difference scheme with group velocity control are used to simulate the Richtmyer-Meshkov (R-M) instability problem produced by cylindrical shock-cylindrical material interface with shock Mach number Ms=1.2 and density ratio 1:20 (interior density/outer density). Effect of shock refraction, reflection, interaction of the reflected shock