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| 1 | Climatic and environmental changes over the last millennium recorded in the Malan ice core from the northern Tibetan Plateau显示文摘In this paper, climatic and environmental changes were reconstructed since 1129A.D. based on the Malan ice core from Hol Xil, the northern Tibetan Plateau. The record of δ 18O in the Malan ice core indicated that the warm-season air temperature variations displayed a general increase trend, the 20th-century warming was within the range of natural climate variability, and the warmest century was the 17th century while the warmest decade was the 1610s, over the entire study period. The “Medieval Warm Epoch” and “Little Ice Age” were also reflected by the ice core record. The dust ratio in the Malan ice core is a good proxy for dust event frequency. The 870-year record of the dust ratio showed that dust events occurred much frequently in the 19th century. Comparing the variations of δ 18O and the dust ratio, it is found that there was a strong negative correlation between them on the time scales of 101―102 years. By analyses of all the climatic records of ice cores and tree rings from the northern Tibetan Plateau, it was revealed that dust events were more frequent in the cold and dry periods than in the warm and wet periods. | WANG Ninglian1,2, YAO Tandong2,1, PU Jianchen1, ZHANG Yongliang1 & SUN Weizhen1 1. Key Laboratory of Cryosphere and Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China 2. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China | 2006 | Science China Earth Sciences2006，49，10： | 11 |
| 2 | Structure and stability of (AlN)_n clusters显示文摘AIN and Al2N2 have been observed in the record of time-of-flight mass-spectra as positive ions. Associating with density functional theory(DFT) B3LYP method with 6-31G* basis set, we have carried out the optimizing calculations of the geometry, electronic state and vibrational frequency for (AIN)n (n = 1-15) clusters, moreover, discussed the character of the chemical bond and thermodynamical stability and explained the experimental mass spectra. The results show that there do not exist AI-AI and N-N bonds and only exists AI-N bond in the ground state structures of (AIN)n clusters; and the 'magical number' regularity of (AIN)n is those whose atom number Is 4, 8, 12,16, 20, etc, all of which are times of four. | 武海顺 张聪杰 许小红 郑兰荪 张乾二 | 2000 | Science China Chemistry2000，43，6： | 2 |
| 3 | Study on the general model of hydrological frequency analysis显示文摘On the basis of exponential Gamma distribution, this paper presents a model consisting of 11 kinds of distribution curves for the first time. The model contains several frequency curves used commonly in China and other countries, for example, Pearson type-3 distribution, Kritsky and Menkel (USSR) distribution, Logarithmic normal distribution, and so on. Through dealing with parameters, the model may be applicable to the hydrological extreme values of different climate regions, and has very strong flexibility. In this paper, a real case study using flood datum of 240 different hydrological stations in China is submitted and the calculating results are satisfactory. | 王浩 秦大庸 孙济良 王建华 | 2001 | Science China(Technological Sciences)2001，44，S1： | 1 |
| 4 | A theoretical and experimental research on nonlinear effects of large-amplitude ion acoustic wave显示文摘O ’Neil and Al’tshul et al.discussed the nonlinear theory of large-amplitude electronplasma waves (EPW). Franklin reported the experimental results of periodic amplitudevariation of EPW caused by wave-particle interaction. In 1990, we discussed thenonlinear Landau damping caused by electrons trapped in ion acoustic wave (IAW) withIAW drift instability. In the present note we will study theoretically and experimentally thethree stages for the IAW amplitudes to develop from linear Landau damping (growing) tononlinear effects. The experiments were performed in a double plasma device, which | 王文清 | 1995 | Chinese Science Bulletin1995，40，13： | 0 |
| 5 | Heterogeneity of Adult Polycystic Kidney Disease Analysis of an APKD Family Unlinked to 3'HVR显示文摘The majority of adult polycystic kidney disease (APKD) cases belong to the autosomal dominant category, occurring with a gene frequency of 1:1000 in Europe and North America. Although reliable statistical data are still lacking, APKD is not rare in China. In 1985, Reeders reported that PKD1, the APKD gene, was located on the short | 刘国仰 袁丽芳 刘翀 张小晓 叶珏 罗会元 赵俊谋 叶子钧 陈翚 | 1993 | Chinese Science Bulletin1993，38，2： | 0 |
| 6 | Structure and stability for (AlN)_n^+ and (AlN)_n^- (n=1-15) clusters显示文摘Using density functional theory (DFT) method with 6-31G* basis set, we have carried out the optimizing calculation of geometry, vibrational frequency and thermodynamical stability for(AIN)n+ and (AIN)n- (n =1-15) clusters. Moreover, their ionic potential (IP) and electron affinity(EA) were discussed. The results show that the electrical charge condition of the cluster has a relatively great impact on the structure of the cluster and with the increase of n, this kind of impactis reduced gradually. There are no AI-AI and N-N bonds in the stable structure of (AIN)n+ or (AIN)n-, and the AI-N bond is the sole bond type. The magic number regularity of (AIN)n+, and (AIN)n- is consistent with that for (AIN)n, indicating that the structure with even n such as 2, 4,6, … is more stable. In addition, (AIN)10 has the maximal ionization power (9.14 eV) and the minimal electron affinity energy (0.19 eV), which manifests that (AIN)10 is more stable than other clusters. | 武海顺 张富强 许小红 张乾二 张聪杰 | 2002 | Science China Chemistry2002，45，3： | 0 |
| 7 | VORTEX SHEDDING FREQUENCY DETERMINED BY SURFACE PRESSURE FLUCTUATIONS OF THREE EQUISPACED CYLINDERS显示文摘1. INTRODUCTIONInterferenceamongmultiplecylindersisoffundamentalengineeringimportanceinitsextensiveindustrialapplications.Alot?.. | Dong Li yun, Xu You heng, Huang Dong qun Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, P.R.China | 1999 | Journal of Hydrodynamics1999，11，4： | 0 |
| 8 | C3 PHENOTYPE AND ALLELES,C3 HAV4-1 MONOCLONAL PHENOTYPE DISTRIBUTION IN HYPERTENSIVE PATIENTS WITH IgA GLOMERULONEPHRITIS显示文摘C3PHENOTYPEANDALLELES,C3HAV4-1MONOCLONAL PHENOTYPEDISTRIBUTIONINHYPERTENSIVEPATIENTSWITHIgAGLOMERULONEPHRITISGuoJizhen(郭冀珍)(S... | 郭冀珍 | 1995 | Medical Bulletin of Shanghai Jiaotong University1995，18，1： | 0 |
| 9 | THE THREE-DIMENSIONAL ANALYSIS OF THE SELF-VIBRATIONAL CHARACTERI-STICS OF THE 2050MM HOT-STRIP MILL HOUSING BY MEANS OF LASER HOLOGRAPHIC INTERFEROMETRY AND FINITE ELEMENT METHOD显示文摘According to the theory of similarity,a three-dimensional simulation study on the self-vibrational characteristics of the2050mm hot-strip finishing mill housing at Baoshan Ironand Steel Complex has been carried out.The analysis of the main vibrational modes of thefirst three orders has also been done by means of holographic interferometry.In addition,the authors have carried out the numerical analysis of finite elements in three dimensions.The comparison of the results of both analyses(simulation analysis and numerical analysisof finite element)shows that they are consistent. | 刘慰俭 蒋维兴 瞿志豪 | 1991 | Applied Mathematics and Mechanics(English Edition)1991，12，3： | 0 |
| 10 | MATRIX PERTURBATION METHOD FOR THE VIBRATION PROBLEM OF STRUCTURES WITH INTERVAL PARAMETERS显示文摘MATRIXPERTURBATIONMETHODFORTHEVIBRATIONPROBLEMOFSTRUCTURESWITHINTERVALPARAMETERSQiuZhi-ping(邱志平)ChenSu-huan(陈塑寰)Liuzhong-shen... | 邱志平 陈塑寰 刘中生 | 1994 | Applied Mathematics and Mechanics(English Edition)1994，15，6： | 0 |
| 11 | Generation of Time History Compatible with Multi-Damping Response Spectra显示文摘Based on the method developed by M. Hirasawa and M. Watabe (1992), the authors deduced the related mathematical formulas. Taking an artificial ground motion compatible with single-damping as the original time history, a small corrected time history was calculated by solving linear equations using a singular value decomposition method. We performed iteration to obtain the simulated earthquake motion compatible with multi-damping within a certain accuracy. The influences of selective matching frequencies are discussed preliminarily. Although the current criterion still has no explicit demand on different numbers of matching frequencies for various damping factors, it should be taken into account in practice. | Zhang Tianzhong and Ma YunshengInstitute of Geophysics, CSB, Beijing 100081, China | 1999 | Earthquake Research in China1999，13，3： | 0 |
| 12 | APPLICATION OF PARA-FOURIER INTEGRAL OPERATORS TO PROPAGATION OF NONLINEAR SINGULARITIES显示文摘In this paper, the author applies the Egorov Theorem for paradifferential operators established by the theory of para-Fourier integral operators to reduce microlocally paradifferential operators with the principal type. This reduction is used to study the propagation of singularities for solutions to nonlinear differential equations in the lower frequency range. | 仇庆久 | 1990 | Science China Mathematics1990，33，9： | 0 |
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