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| 1 | The lower bounds of classic Ramsey number R(5,9). and R (5,10)显示文摘IT is very difficult to establish the Ramsey number, so we often use the way of getting the up-per and lower bound of the Ramsey number to near the exact value. All lower bounds of R (5,l) known so far are shown in table 1. | XIE Jiguo and ZHANG Zhongfu1. Lanzhou Normal College, Lanzhou 730070, China 2. Lanzhou Railway Institute, Lanzhou 730070, China | 1997 | Chinese Science Bulletin1997，42，14： | 8 |
| 2 | Study on the Influence of Abrupt Climate Variation on the Vegetation Based on NDVI显示文摘[Objective] The research aimed to study the influence of abrupt climate variation on the vegetation based on NDVI. [Method] Based on NDVI and climate data in China during 1982-2000, by using Mann-kendall (MK) abrupt change detection method, the abrupt variations of climate and NDVI were detected. Then, the relationship between two kinds of abrupt variations was discussed. [Result] The large-area abrupt variations of monthly average temperature and rainfall happened in 1983, and the occurrence range in 1999 was the smallest. The large-area abrupt variation phenomenon of vegetation appeared in 1983 and 1984. The occurrence times of NDVI abrupt variation phenomenon which was induced by the abrupt variation of temperature was more than that of precipitation. The abrupt variation of rainfall wasn't one of main reasons for the occurrence of NDVI abrupt variation phenomenon. The small-area abrupt variation of temperature was difficult to generate the immediate influence on the vegetation activity in the short time. The abrupt variation phenomenon of large-scale temperature would generate the long-term influence on the vegetation activity. [Conclusion] The research provided the theory basis for analyzing the abrupt variation phenomenon of climate. | MENG Meng1, ZONG Mei-juan21. Shandong University of Technology, Zibo 255049, China 2. Zibo Vocational Institute, Zibo 255049 China | 2011 | Meteorological and Environmental Research2011，2，4： | 1 |
| 3 | Research on nonlinear constitutive relationship of permanent deformation in asphalt pavements显示文摘To predict correctly the rut depths in asphalt pavements,a new nonlinear viscoelastic-elastoplastic constitutive model of permanent deformation in asphalt pave-ments is presented. The model combines a generalized Maxwell model with an elasto-plastic one. Then from the creep theory,the linear and nonlinear constitutive equations of the generalized Maxwell model are obtained. From the nonlinear finite element method for the rutting of the asphalt pavement,the rut depths of 4 asphalt-aggregate mixtures are obtained. And the results are compared with the ones from the finite element method by SHRP and the experiments by SWK/UN. The results in this paper are better than the ones by SHRP,and agree with the ones of the experiment by SWK/UN. This shows that the nonlinear viscoelastic-elastoplastic constitutive model,which is presented in this paper for the rutting of the asphalt pavement,is effective. The properties,such as nonlinear elastic-ity,plasticity,viscoelasticity and nonlinear viscoelasticity,which affect the rutting of an asphalt pavement,can be shown in the model. And the characteristics of the permanent deformation of the asphalt pavement can be presented entirely in the model. | PENG Miaojuan1 & XU Zhihong2 1. Department of Civil Engineering,Shanghai University,Shanghai 200072,China 2. School of Transportation Engineering,Tongji University,Shanghai 200092,China | 2006 | Science China(Physics,Mechanics & Astronomy)2006，49，6： | 16 |
| 4 | Nonlinear ergodic theorem for semitopological semigroups of non-Lipschitzian mappings in Banach spaces显示文摘LET G be a semitopological semigroup, i. e. G is a semigroup with a Hausdorff topology such that for each s∈G the mapping s|→s·t and s|→t·s from G to G are continuous. G is called right reversible if any two closed left ideals of G have non-void intersection. In this case, (G,≤) is a directed system when the binary relation '≤' on G is defined by a≤b if and only if Let E be the uniformly convex Banach space | LI Gang and MA Jipu1. Department of Mathematics, Yangzhou Normal College, Yangzhou 225002, China 2. Department of Mathematics, Nanjing University, Nanjing 210093, China | 1997 | Chinese Science Bulletin1997，42，1： | 16 |
| 5 | Bergman kernels on generalized Hua domains显示文摘The Bergman kernel functions with explicit formulas of the generalized Hua domains are obtained. And the holomorphic automorphism group for each generalized Hua domain is also given. | YIN Weiping and SU Jianbing(1. Department of Mathematics, Capital Normal University, Beijing 100037, China 2. Department of Mathematics, Xuzhou Normal University, Xuzhou 221116, China) | 2002 | Progress in Natural Science:Materials International2002，12，12： | 11 |
| 6 | Analysis of the severe group dust storms in eastern part of Northwest China显示文摘Based on the available original dust storm records from 60 meteorological stations, we discussed the identification standard of severe dust storms at a single station and constructed a quite complete time series of severe group dust storms in the eastern part of Northwest China in 1954-2001.The result shows that there were 99 severe group dust storms in this region in recent 48 years. The spatial distribution indicates that the Alax Plateau, most parts of the Ordos Plateau and most parts of the Hexi Corridor are the main areas influenced by severe group dust storms. In addition, the seasonand the month with the most frequent severe group dust storms are spring and April, accounting for 78.8% and 41.4% of the total events respectively. During the past 48 years the lowest rate of severe group dust storms occurred in the 1990s. Compared with the other 4 decades, on the average, the duration and the affected area of severe group dust storms are relatively short and small during the 1990s. In 2000 and 2001, there were separately 4 severe group dust storms as the higher value after 1983 in the eastern part of Northwest China. | ZHOU Zijiang, WANG Xiwen(1. National Meteorological Center, Beijing 100081, China 2. Lanzhou Central MeteorologicalObservatory, Lanzhou 730020, China) | 2002 | Journal of Geographical Sciences2002，12，3： | 10 |
| 7 | An integrated decision method for prediction of tropical cyclone movement by using genetic algorithm显示文摘In this study an integrated decision method for the multi-prediction results of tropical cyclone movements by using genetic algorithm (GA) has been adopted. A genetic learning artifi- cial neural network (GLANN) as a learning mechanism for track prediction was developed through training with the huge samples of typhoon tracks from 1884 to 2002. The prediction of typhoon motion is to consider how to suit the dynamic change of environment, where typhoon passed through. The neural network structure is described by GA. A fitness function for choice of GA is given to approach the maximum of fitness (the minimum of the errors). Parallel comparing analyses for prediction abilities of unusual typhoon tracks in recent years by GLANN with multi-forecast methods were conducted. More types of cases were employed in the comparing analyses, which consist of the typhoon, Winnie, No.11, in 1997, characterized by a long life over the ocean and in the mainland with severe effect on China, the 10 unusual typhoon tracks in the 1990s, the tracks with landfall and affected action in 1998 and the typhoons born in the Northwestern Pacific and the South China Sea in 2000, including the 24—48 h forecast, etc. The results indicated that for prediction ability of typhoon tracks, specially for unusual typhoons, GA decision-making developed in this study is superior to the others. | YANG Yuanqin1 & WANG Jizhi2 1. National Meteorological Center, Beijing 100081,China 2. Chinese Academy of Meteorological Sciences, Beijing 100081, China | 2005 | Science China Earth Sciences2005，48，3： | 6 |
| 8 | A new method for multi-exponential inversion of NMR relaxation measurements显示文摘A new method for multi-exponential inversion to NMR T1 and T2 relaxation time distributions is suggested and tested. Inversion results are compared with MAP-II which is based on SVD algorithm and widely accepted in the industry. Inversed NMR relaxation spectra that have different pre-assigned relaxation times from echo trains with different SNR confirm that the new method with 16 to 64 equally spaced time constants in logarithm scale will ensure the relaxation distribution. Testing results show that the new inversion algorithm is a valuable tool for rock core NMR experimental analysis and NMR logging data process and interpretation. | WANG Zhongdong1, 2, XIAO Lizhi1 & LIU Tangyan1 1. Petroleum University, Beijing 102249, China 2. Liaohe Petroleum Administration, Panjin 124011, China | 2004 | Science China(Physics,Mechanics & Astronomy)2004，47，3： | 4 |
| 9 | Chemical characteristics of clay minerals in the sediments from the Yellow River and the Changjiang River显示文摘THE characteristics of clay minerals are controlled by the characters of weathered mother rock and the weathering environments in source area. The characteristics of clay minerals of the Yellow River should be different from those of the Changjiang River because the characters of mother rock and the weathering environments in the drainage area of the Yellow River are quite different from those in the drainage area of the Changjiang River, so it is important to find a difference between the characteristics of clay minerals of the Yellow River and | HE Liangbiao and LIU Qingyu1.First Institute of Oceanography, State Oceanic Administration, Qingdao 266003, China 2. Institute of Physical Oceanography Ocean University of Qingdao, Qingdac 266003, China | 1997 | Chinese Science Bulletin1997，42，6： | 4 |
| 10 | Seabed Classification Using BP Neural Network Based on GA显示文摘Side scan sonar imaging is one of the advanced methods for seabed study. In order to be utilized in other projects, such as ocean engineering, the image needs to be classified according to the distributions of different classes of seabed materials.In this paper, seabed image is classified according to BP neural network, and Genetic Algorithm is adopted in train network in this paper. The feature vectors are average intensity, six statistics of texture and two dimensions of fractal. It considers not only the spatial correlation between different pixels, but also the terrain coarseness. The texture is denoted by the statistics of the co-occurrence matrix. Double Blanket algorithm is used to calculate dimension.Because a uniform fractal may not be sufficient to describe a seafloor, two dimensions are calculated respectively by the upper blanket and the lower blanket. However, in sonar image, fractal has directivity, i.e. there are different dimensions in different direction. Dimensions are different in acrosstrack and alongtrack, so the average of four directions is used to solve this problem. Finally, the real data verify the algorithm. In this paper, one hidden layer including six nodes is adopted. The BP network is rapidly and accurately convergent through GA. Correct classification rate is 92.5% in the result. | Yang Fanlin1, Liu Jingnan2 1. GPS Engineering Research Center, Wuhan University, Wuhan 430079, China. 2. Presidential Secretariat, Wuhan University, Wuhan 430079, China | 2003 | Acta Oceanologica Sinica2003，22，4： | 3 |
| 11 | A new definition of restricted Lie superalgebras显示文摘A new definition of restricted Lie superalgebras has been given; some important results on the representation theory of restricted Lie superalgebra have been obtained. | WANG Ying & ZHANG Yongzheng1. Department of Mathematics, Harbin Institute Technology, Harbin 150001, China 2. Department of Mathematics, Northeast Normal University, Changchun 130024, China | 2000 | Chinese Science Bulletin2000，45，4： | 3 |
| 12 | A note on n-edge chromatic number显示文摘ALL graphs appearing in this note are simple. A graph with p vertices and q edges will becalled a (p, q )-graph. The maximum degree of G is denoted by Δ(G).Let n≥2 be an integer. The n-edge chromatic number X_n (G) of a simple graph G is theminimum cardinality of a set of colors with which one can assign the colors to the edges of Gsuch that the edges on a path of length less than or equal to n receive different colors.The aim of this note is to explore the bounds for X’_n (G) and X’_n (G) + X’_n (G). It is | SUN Liang and ZHANG Zhongfu1. Department of Applied Mathematics, Beijing Institute of Technology, Beijing 100081, China 2. Institute of Applied Mathematics, Lanzhou Institute of Railway, Lanzhou 730070, China | 1997 | Chinese Science Bulletin1997，42，23： | 2 |
| 13 | The features of gravity field and deep structure in western part of the South Yellow Sea显示文摘The gravity data from the sea region to the west of 124° E of the South Yellow Sea have been processed and the feature of gravity fields analyzed. An experience relationship formula on the filter wavelength and corresponding depth has been put forward. Combined with the geological and seismic data, the deep tectonic framework and structural characters as well as possible favourable prospecting district for hydrocarbon in the South Yellow Sea have been discussed and analyzed. | WANG Qianshen1 & AN Yulin1. Institute of Geophysics, Chinese Academy of Sciences, Beijing 100101, China 2. Chinese University of Geology, Beijing 100083, China | 2000 | Chinese Science Bulletin2000，45，8： | 2 |
| 14 | An equality on Hochschild homology groups显示文摘LET A be finite-dimensional algebra over field k,and Ae the enveloping algebra of A,i.e.Ae=A kAop,where Aop is the opposite algebra of A.Any A-bimodule has a natural left Ae-module structure as follows: | ZHANG Pu and LIU Shaoxue1. Department of Mathematics, University of Science and Technology of China, Hefei 230026, China 2. Department of Mathematics, Beijing Normal University, Beijing 100875, China | 1997 | Chinese Science Bulletin1997，42，8： | 1 |
| 15 | The Computer Aided Integrated Design and Analysis of Oil Tank in Vehicle显示文摘This paper creates 3D solid model and assembly of U RJ 92-6 oil tank and analyses its strength by integrated CAD/CAE/CAM software I-D EAS. Through integrated simulation in computer, design efficiency and quality of oil tank is greatly improved. Adopting integrated CAD/CAE/CAM software to carry out integrated research to equ ipment and products, we will be able to take overall analysis in aspects of 3-D solid modeling, pre-assembly and strength, etc., to realize non-paper designi ng and parallel designing. Problems can be found and settled during designing, w hich will increase designing efficiency and one-time success rate and realize o ptimum designing for products. | CHEN Xu 1, CHEN Yong-guang 2 (1. Mechanical Engineering Institute, Chongqing University, Chongqing 400044, China 2. Logistical Engineering University, Chongqing 400016, China) | 2002 | 厦门大学学报(自然科学版)2002，41，S1： | 1 |
| 16 | Present random computations in a uniform way显示文摘Some equivalent definitions for PP are introduced, which allows us to present the randomized complexity classses RP, NP, PP, BPP in a uniform format. | ZHAO Yunlei and ZHU Hong(1. Department of Computer Science, City University of Hong Kong, China 2. Department of Computer Science, Fudan University, Shanghai 200433, China) | 2002 | Progress in Natural Science:Materials International2002，12，11： | 1 |
| 17 | In situ reproductive organs of Early Cretaceous ferns from Northeast China显示文摘FILICOPSIDA is a predominant group of the Early Cretaceous floras of Northeast China, whichapproximates 100 species and accounts for more than one third of the floras. The majority ofthis group are of great importance and significance in stratigraphy. The previous studies ofthese ferns are mainly morphological, with only a few concerning the in situ spores andsporangia. In recent years. the authors have carried out a research project on the in situreproductive organs of the Early Cretaceous ferns from/ basins of Inner Mongolia, Liaoning,Jilin and Heilongjiang of Northeast China. The study focuses on 35 species of 17 genera be-longing to 10 families. The present note briefly introduces the results of this study by listingsome representative species. | DENG Shenghui and CHEN Fen1. Research Institute of Petroleum and Development, Beijing 100083 2. China University of Geosciences, Beijing 100083, China | 1997 | Chinese Science Bulletin1997，42，23： | 1 |
| 18 | Characteristic modules of quasi-hereditary algebras with three samples显示文摘CLINE et al. have introduced the concept of quasi-hereditary algebra, which provided a | ZHANG Pu and LIN Yanan1. Department of Mathematics, University of Science and Technology of China, Hefei 230026, China 2. Department of Mathematics, Xiamen University, Xiamen 361005, China | 1997 | Chinese Science Bulletin1997，42，6： | 1 |
| 19 | Restoration of eroded stratal thickness in key periods of tectonic change in a multi-stage superimposed Tarim Basin in China | Liu Hao1, Wang Yingmin2 1. School of Marine Sciences, China University of Geosciences (Beijing), Beijing 100083, China 2. School of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China | 2012 | Journal of Palaeogeography2012，1，2： | 1 |
| 20 | Efficient 4-round zero-knowledge proof system for NP显示文摘A 4-round zero-knowledge interactive proof system for NP (Non-deterministic Polynomial) is presented when assuming the existence of one-way permutations and collision-free hash functions. This construction is more efficient than the original construction of 5-round zero-knowledge proof system for NP. The critical tools used in this paper are: zap, hash-based commitment scheme and non-interactive zero-knowledge. | ZHAO Yunlei and ZHU Hong(1. Department of Computer Science, City University of Hong Kong, China 2. Department of Computer Science, Fudan University, Shanghai 200433, China) | 2002 | Progress in Natural Science:Materials International2002，12，12： | 1 |
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