面落实科学发展观为经济发展提供国土资源保障

为严格落实国家宏观经济调控政策，保护耕地，促进集约用地，保障经济发展，菏泽市国土资源局从挖掘存量土地人手，为招商引资项目落地做了大量卓有成效的工作。     

山东低碘地方性甲状腺肿与地质环境的关系

山东是我国地方性甲状腺肿（简称地甲病）流行较广泛的省份之一，受害人口约２０００万人，对人体健康危害很大。地质环境中碘元素的缺乏或过量是形成地甲病的主要因素。山东省内流行的地甲病可分为低碘型和高碘型两种。山东低碘型地申病区主要分布在鲁西隆起区和鲁东隆起区内的山地丘陵区中，重病区（患病率＞１０％）一般分布在山地地貌单元中，轻病区（患病率３—１０％）一般分布在丘陵地貌单元中。低碘地甲病的发生与岩性、土壤、地下水、地质构造、地貌等地质环境因子存在着密切的关系。     

Embankment deformation analyzed by elastoplastic damage model coupling consolidation theory

The deformation, of embankment has serious influences on neighboring structure and infrastructure. A trial embankment is reanalyzed by elastoplastic damage model coupling Blot＇ s consolidation theory. With the increase in time of loading, the damage accumulation becomes larger. Under the centre and toe of embankment, damage becomes serious. Under the centre of embankment, vertical damage values are bigger than horizontal ones. Under the toe of embankment, horizontal damage values are bigger than vertical ones.     

平动及其在起潮力中的作用

在讨论日月起潮力时，可以不考虑地球的自转，把地球绕地月公共质心的运动直接看成平动是安全合理的，给出了在平动前提下，地球表面或地球内部任意一点在随地心绕地月公共质心作圆周运动时的轨迹方程，从而从数学上论证了可以把地球任意一点的起潮力定义为天体（月球或太阳）对该点的引力与地心引力的矢量差，既简明又抓住了起潮力的本质。     

Estimates of AGN Black Hole Mass and Minimum Variability Timescale

Black hole mass is one of the fundamental physical parameters of active galactic nuclei (AGNs), for which many methods of estimation have been proposed. One set of methods assumes that the broad-line region (BLR) is gravitationally bound by the central black hole potential, so the black hole mass can be estimated from the orbital radius and the Doppler velocity. Another set of methods assumes the observed variability timescale is determined by the orbital timescale near the innermost stable orbit around the Schwarzschild black hole or the Kerr black hole, or by the characteristic timescale of the accretion disk. We collect a sample of 21 AGNs, for which the minimum variability timescales have been obtained and their black hole masses (Mσ) have been well estimated from the stellar velocity dispersion or the BLR size-luminosity relation. Using the minimum variability timescales we estimated the black hole masses for 21 objects by the three different methods, the results are denoted by Ms, Mk and Md, respectively. We compared each of them with Mσindividually and found that: (1) using the minimum variability timescale with the Kerr black hole theory leads to small differences between Mσand Mk, none exceeding one order of magnitude, and the mean difference between them is about 0.53 dex; (2) using the minimum variability timescale with the Schwarzschild black hole theory leads to somewhat larger difference between Mσand Ms: larger than one order of magnitude for 6 of the 21 sources, and the mean difference is 0.74 dex; (3) using the minimum variability timescale with the accretion disk theory leads to much larger differences between Mσand Md, for 13 of the 21 sources the differences are larger than two orders of magnitude; and the mean difference is as high as about 2.01 dex.     

陕西首次发现南方象化石

在陕西省澄城县采集到一对保存相当完好的南方象第三上臼齿化石。我国关于南方象化石的报导不多,在陕西省则是首次发现。这一发现对了解更新世时期南方象在我国的分布提供了新资料。     

A VLBI study of 20 southern extragalactic radio sources

This paper describes a 5 GHz VLBI survey in the southern hemisphere. The first observation of 23 extragalactic radio sources was conducted in November 1992. Twenty VLBI images were obtained, of which 15 sources show core-jet structure, one has a two-sided jet, and three sources are unresolved. No compact double source was found. Eleven of the 16 sources with core-jet (including a two-aided jet) show evidence of jet bending. In addition, four sources appear to be superluminal, of which three sources are new.     

MULTI-DIMENSIONAL NUMERICAL STUDIES OF CONVECTION-RELATED STELLAR PROBLEMS

1　IntroductionManybottlenecksinthetheoreticalstudyofstellarevolutionarisefromthelackofunder standingofsomehighlycomplicatedprocessesthatcannotbetreatedwithanalyticaltech niques .Alargeportionoftheseprocessesisrelatedtohydrodynamics,particularlyconvec tion .Theapplicationofmultidimensionalnumericalcomputationstotheinvestigationofthesedifficultproblemshasmadegreatprogressinrecentyears .Here ,weprovideasurveyoftherecentnumericalstudiesofconvectionrelatedproblems.Theobjectiveistoassistthosewhoar…     

On efficiency of convection of Öpik's cellular convection theory

The physical meaning of the convection efficiency parameter of Öpik's theory is clarified by relating it to that of the mixing-length theory. A compact comparison of both theories is presented to explain the earlier findings of Gough and Weiss (1976), that Öpik's theory becomes indistinguishable from the mixing-length theory when the value of Öpik's cell depth is taken as being equal to 2.44 times the local pressure scale height for the solar convective envelope.     

1-2GHz太阳射电动态频谱仪

本文描述了北京天文台研制的１－２ＧＨｚ太阳射电动态频谱仪的性能、结构、初步观测结果及进一步改进计划．