最新刊期
      卷 49 ， 期 4 ， 2010
      • Vol. 49, Issue 4, Pages: 1-5(2010)
        摘要：This study has developed the platform for Geographical Simulation and Optimization Systems (GeoSOS). The objective is to improve the limitations of current GIS on process analyses. GeoSOS consists of three major integrated components, cellular automata (CA), multiagent systems (MAS), and swarm intelligence (SI). This system is equipped with common CA algorithms, such as MCECA, LogisticCA, PCACA, ANNCA, and DecisiontreeCA. This system can automatically obtain transition rules according to data mining techniques. The incorporation of MAS and SI can help to solve a variety of complex geographical simulation and optimization problems. Another novelty of this proposed system is its capability of coupling simulation models with optimization models. Experiments have demonstrated that this coupling strategy can yield more satisfactory modeling results under complex changing environments.  
        关键词：geographical simulation and optimization systems;geographical cellular automata;multiagent systems;swarm intelligence;coupling   
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      • ZHANG Liuwei,XU Yuantong
        Vol. 49, Issue 4, Pages: 6-10(2010)
        摘要：The existence of almost periodic solutions of some more generalized nonlinear Duffing equations is studied. Firstly, by means of the Lyapunov functions, the exponential dichotomy of the auxiliary linear equations is established. Then, by combining the fixed point theorem in some suitable space, using the Lyapunov function again, the existence of almost periodic solutions of the nonlinear Duffing equations and module inclusion are obtained.  
        关键词：Duffing equations;almost periodicity;exponential dichotomy;Lyapunov functions   
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      • XU You,XIONG Huiyuan,ZONG Zhijian
        Vol. 49, Issue 4, Pages: 11-15(2010)
        摘要：A correcting method was described to improve the accuracy of line structuredlight measurement system. According to the errors between the actual object spots calibrated and the object spots calculated from the calibration approach, the database of cameras pixelobjecterror is established by interpolation. The result of measurement can be corrected by using the database. Tsais calibration and polynomial fitting were used in the experiments, and the results are corrected by the method and analyzed. The experiments show that the correcting method is effective and applicable to a variety of calibration methods and the precision is suitable for the requirement of measurement.  
        关键词：residual correction;interpolation;Tsais calibration approach;polynomial fitting   
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      • ZHAO Yuzhong,GUO Jifeng
        Vol. 49, Issue 4, Pages: 16-20(2010)
        摘要：A new Hilbert integral inequality with a best constant factor is established by introducing a parameter λ, β function and Taylor series. Two best extensions of it and the equivalent forms are given.  
        关键词：Hilbert inequality;β function;Taylor series   
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      • GAO Yuejie,
        Vol. 49, Issue 4, Pages: 21-25(2010)
        摘要：It is known that the hyperbolic and parabolic complex are two fundamental types for infinite and simply connected complexes, whose corresponding circle packings fill the hyperbolic and the Euclidean plane, respectively. Given an infinite simply connected complex K with boundary, it is proved that there exists an univalent circle packing P for K in the hyperbolic plane D whose circles associate with boundary vertices of K are horocycles, which is complete in the sense of permitting the existence of interstices between horocycles and unit circle D. Moreover, the circle packing P is unique up to Mbius transformations of D.  
        关键词：circle packing;infinite complex;fundamental dichotomy   
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      • Vol. 49, Issue 4, Pages: 26-29(2010)
        摘要：Based on the PoissonBoltzmann equation for electric double layer and NavierStokes equation for the flow of liquid, a mathematical model to simulate the complex coupled heat and moisture transfer in porous fibrous media with consideration of the effects of electric double layer is presented. With specification of initial and boundary conditions, the distributions of the temperature and liquid water content in the porous fibrous media were numerically computed. The comparison with a series of experimental measurements, which shows the superiority of this model in resolving the coupled heat and liquid moisture transfer in porous fibrous media, illustrates that the heat and moisture transfer process is influenced by the electric double layer.  
        关键词：electric double layer;liquid moisture permeability;porous fibrous media   
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      • Vol. 49, Issue 4, Pages: 30-32(2010)
        摘要：In constructing pairingfriendly ellitpic curves, the curve parameters are often represented by polynomials with rational coefficients. For efficiently generating the curves parameters, the degree of the complex multipliction polynomial must be less than 3. A method is proposed to constructed suitable polynomials which will make the degree of the complex multipliction polynomial less than 3. Some examples are given, especially when embedding degree is 8. It is generally believed that when embedding degree is 8 the complex multipliction polynomial whose degree is less than 3 does not exist.  
        关键词：pairing;polynomial;ellitpic curve;number field   
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      • Vol. 49, Issue 4, Pages: 33-37(2010)
        摘要：According to the basic idea of classical yinyang complementarity and modern dualcomplementarity, the unconventional Hamiltontype variational principle in phase space for dynamics of Timoshenko beam with linear damping is established, which can fully characterize the initialboundaryvalue problem of this dynamics. And its Euler function has symplectic structure character. Based on this variational principle in phase space, a symplectic space finite element—time subdomain method is presented. This new method is the result of combining finite element method in space domain with time subdomain method by applying the Lagrange interpolation polynomials as approximation to the time subdomain. The numerical results show that the stability, convergence, computational accuracy and efficiency of this new method obviously improve those of widely used Wilsonθand Newmarkβ methods.  
        关键词：phase space;unconventional Hamiltontype variational principle;initialboundaryvalue problem;symplectic algorithm;dynamic response   
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        发布时间：2023-12-11
      • WANG Zehui
        Vol. 49, Issue 4, Pages: 38-42(2010)
        摘要：For efficiently implementing the encryption/decryption for digital multimedia, which is often with huge amount of data and much redundancy, the accurate period of high dimension random matrix scrambling permutation is studied with the help of number theory and algebraic theory. Some new properties of a class of integer matrices and the solutions of its correlative congruent equations are obtained by generalizing some results for linear algebra in real fields to the finite fields over modulo prime numbers. Based on these properties, random scrambling permutation can be extended to any high dimension matrix A and the period T(A,N) with an arbitrary prime power modulo N=pr can be accurately expressed. The complexity of the computation of T(A,N) is presented. The results can be used to construct new cryptosystems for digital multimedia and information hiding systems with bigger key spaces to improve their security levels.  
        关键词：random matrices scrambling transformations;periodicity;finite fields over modulo prime numbers;digital multimedia encipher;fast algorithm   
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      • Vol. 49, Issue 4, Pages: 43-48(2010)
        摘要：A new approach of watermarking adaptively in DC coefficients of color images is presented. The proposed algorithm uses two AC coefficients of DCT blocks to classify the pixel blocks into three different types, namely, smoothed, edged, and texture block. The strength of watermark is set adaptively according to the pixel block type. Four subimages from the original color image can be obtained with downsampling. These subimages are highly correlated. Take into consideration the correlationship.One bit watermark is embedded，in two DC coefficients which is selected from the subimages. The selection of DC coefficients is based on Keycontrolled random numbers so as to disperse the energy of watermark and win secure watermarking. Blind extraction of watermark can be performed directly on pixel domain. Whilst the watermark is inserted into both the luminance component in YIQ model and the blue channel in RGB model, and examine and compare their performances. Extensive experimental results demonstrate that the algorithm achieves the high robustness and good quality of watermarked image, and the performance of watermarking in Y component outperforms that of B component.  
        关键词：color image watermarking;adaptively embedding;DC coefficient;classification   
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      • Vol. 49, Issue 4, Pages: 49-52(2010)
        摘要：Image compression is the foundation for image storage, processing and transmission. Most researches are done in transform domain. A deep research on the application of multiwavelets transform in scalable coding is made, and then a new image coding method,which is Fine Granularity Scalable image coding method based on CL multiwavelet transform,is proposed.The experimental results show that the proposed coding method is effective. It is a valuable work on the application of multiwavelet transform in image coding.  
        关键词：multiwavelet transform;image coding;CL multiwavelet   
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      • ZHENG Jini,QIN Jiayin,LIU Liangjie
        Vol. 49, Issue 4, Pages: 53-57(2010)
        摘要：A new resource allocation algorithm, which could ensure the fairness and meet the demand that multiple users transmit multiple traffics simultaneously in OFDMA mobile communication system,is proposed.The algorithm is mainly based on the crosslayer design. It takes into consideration both the QoS requirements of services in the MAC layer and the channel status information in the physical layer, hence makes adaptive resource scheduling to make a tradeoff between the fairness and system capacity. Finally,the simulation results,show that the improved system has a higher capacity than the one not applying the trafficdiversity scheme. Besides, the proposed algorithm has an advantage on the performance of ensuing fairness compared with the one that based on the highest capacity.  
        关键词：OFDMA;resource allocation;trafficdiversity;Fairness.   
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      • Vol. 49, Issue 4, Pages: 58-62(2010)
        摘要：By analysis on operation characteristics and environments of seabed miner, the key problem is the local minimum when traditional potential field method is applied on obstacle avoidance. An improved algorithm based on artificial potential field method was put forward. The potential field was redefined and the repulsive potential function was improved. The kinematics model of crawler miner was constructed. It was applied on realtime obstacle avoidance of miner in seabed unknown environment successfully. The simulation results show that the robot can skip from the local minimum and get to the goal smoothly. The improved algorithm is practical and feasible.The research has an instructive meaning for seabed mining and obstacle avoidance of underwater robot.  
        关键词：miner;artificial potential field method;obstacle avoidance   
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      • YANG Wansheng,,GUO Kaihua
        Vol. 49, Issue 4, Pages: 63-66(2010)
        摘要：The production exergy cost is one of main factors of influcing the running economics for CCHP system based on microgas turbine. Different ways of making the price can cause to different product exengy cost results.Based on the conjunction matrix for CCHP exergy flow，the product exergy cost for different running conditioning are calculated in detail by using traditional and energy grades analyzing ways. The calculated results is showed that the way of ascertain the exergy cost in accordance with the energy grades is better than the traditional ways.  
        关键词：CCHP;product;exergy cost;price   
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      • Vol. 49, Issue 4, Pages: 67-70(2010)
        摘要：The interaction mechanism between carboxymethyl cellulose (CMC) and polylactic acid 〖JP3〗(PLA) in solution was studied by FTIR,resonance light scattering (RLS), and fluorescence spectroscopy.〖JP〗The results indicated that the CMC and PLA formed a steady homogeneous intermolecular complex (IPCs) due to the interaction of hydrogen bonding. The effect of mass ratio on the forming of the complex was investigated based on RLS technology.The interaction process of CMC and PLA in solution was directly observed by the analysis of changing trends of RLS signal. The average number of bind sites of the complex was also investigated by selfbuilt mathematical models based on RLS values.  
        关键词：carboxymethyl cellulose;polylactic acid;interaction;spectroscopy   
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      • ZHANG Yi,ZHENG Xuefei,NIU Xinxing,ZHANG Yanzhu,XIAO Shanxiong,LIN Wenxuan,LIU Siwei,HUANG Aiping,CHI Zhenguo
        Vol. 49, Issue 4, Pages: 71-76(2010)
        摘要：A novel polyimide containing alkyl sulphide structure was synthesized through polymerization of 4,4'diamino diphenyl sulphide (SDA) and 3,3′,4,4′biphenyltetracarboxylic acid dianhydride (BPDA) by thermal imidization and chemical imidization. A realtime online tracing method was built up by using the advanced rheology expanded systems(ARES), as well as the effects of reaction conditions to the thermal and chemical imidization by thermogravimetic analysis, which provided more efficient methods for preparing high performance polyimide. The structures and properties of the polyimide were characterized by fourier transform infrared spectroscopy (FTIR), small angle laser light scattering (SALS), contact angle analysis and differential scanning calorimetry (DSC) etc.The results showed that the surface properties of polyimide films were great improved by introducing the alkyl sulphide structure into the main chain of polyimide, which exhibited similar surface tension with copper foil, and higher adhesion work between the new polyimide and copper foil than the traditional one. The absolute weightaverage molecular weight of the polyimide was determined to be(3.8±1.1 )×104g/mol; the decomposition temperature was higher than 560 ℃ .The DSC results showed that the polyimides by both thermal and chemical imidization were with high glass transition temperature.In comparison, chemical imidization was beneficial to getting high degree of imidization, resulting in higher glass transition temperature.  
        关键词：polyimide;alkyl sulphide structure;ARES;contact angle;thermal stability   
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      • WEI Meiyan,SHAO Changlun,,TAN Ni,HU Guping,WANG Changyun,SHE Zhigang,LIN Yongcheng
        Vol. 49, Issue 4, Pages: 77-80(2010)
        摘要：The secondary metabolites of the marine fungus Penicillium sp. from the South China Sea was investigated using silica get column chromatography,preparative thinlayer chromatography and recrystallization,resulting in isolation of nine pure compounds, including three ceramides (1,2,3), three cyclodipeptides (4,5,6), two sterols (7,8) and one structurally unique alkaloid (9).The structure of 1 was characterized by acetylation,hydrolysis reaction, NMR and GCMS and the structure of 9 was analyzed by comprehensive spectroscopic methods,2D NMR, and Xray analysis.  
          
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      • YANG Xiaoli,LI Kaikai,YE Chuangxing,LI Jiaxian,HUANG Hualin,HE Yumei,SONG Xiaohong
        Vol. 49, Issue 4, Pages: 81-85(2010)
        摘要：Volatile oils from flower and oolong tea of cocoa tea (Camellia ptilophylla) were respectively extracted by Head Space-Solid phase microextraction(HSSPME), and analyzed by GC-MS. The result showed that the flowers were mainly consisted of germacrene D(53.97%), α-farnesene(16.07%), agarospirol(3.96%), cyclopropanecarboxyllic acid, tridec2-ynyl ester(3.30%),δ-cadinene(3.22%),β-cubebene(1.96%),alloaromadendren(1.73%), 8-isopropenyl 1,5-dimethyl1,5-cyclodecadiene(1.61%)，Copaene（1.55%）and the contents of seven hydrocarbons were 80.11%. Oolong tea were consisted of transnerolidol(29.1%), cis-3-hexenyl caproate(22.56%), ethyl 4(ethyloxy)2-oxobut-3-enoate(10.21%), linalool(6.17%), perillen(5.97%),α-farnesene(3.54%), trans-phytol(2.11%), Hexyl caproate (1.87%), (3Z)-3-Hexenyl octanoate (1.74%) and the contents of three alcohols four esters and two hydrocarbons were 37.38%, 36.38% and 9.51% respectively in volatile oils. The majority of volatile oils from flowers of cocoa tea were hydrocarbons and alcohols while that of volatile oils from cocoa oolong tea have esters in addition. It is these three kinds of compounds making cocoa tea with the scent of flowers.  
        关键词：Camellia ptilophylla;fragrant flower;oolong tea;volatile oils;GCMS   
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      • Vol. 49, Issue 4, Pages: 86-92(2010)
        摘要：Based on the investigation of large scale sample plots in Shenzhen Special Zone, the plant combinations in 6 types of urban vegetation were analyzed. 63 dominant plants which contributed to over 70% of the vegetation coverage in each type were selected to estimate the amount of CO2sequestrated and O2released by urban vegetation. With the photosynthetic parameters of parts plant species, coverage of each type of urban vegetation which were measured with the information extracted from the aerial photograph, as well as a suited climatic influence model from PnET.It is estimated that the amounts of CO2sequestration and O2release of these plant species monthly and annually, as well as the amount of various urban vegetation in Shenzhen Special Zone. The results show that seasonal intensity of CO2sequestration and O2release is Spring > Summer > Autumn > Winter. The natural park forest which mainly located in periphery areas of Shenzhen Special Zone have the greatest amounts of annual CO2sequestration and O2release. The roadside vegetation has the maximum capacity of CO2sequestration and O2release in a unit of area. While residential and institutional vegetation have the minimum capacity of CO2sequestration and O2release.  
        关键词：CO2sequestration;O2release;urban vegetation;Shenzhen special zone   
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      • Vol. 49, Issue 4, Pages: 93-98(2010)
        摘要：A threedimensional protein molecular structure, which was encoded by the gene Ribose5phosphate isomerase A (RpiA) from Acidithiobacillus ferrooxidans，was constructed by the homologymodeling technique and moleculardynamics simulation. The obtained structure was applied to search binding sites and carry out flexible docking with the substrate ribose5phosphate (R5P). The results showed that the substrate R5P can be effectively recruited into the active pocket and be activated immediately; the residues of Asp81, Thr31, Lys121, Ser30, Glu103, Asp84, Lys94, Asp118, Lys7,Gly97, Gly29, Gly95, Thr28 and H2O play a critical role in the binding or catalysis of R5P. Among the above residues, Gly97, Gly29, Gly95, Thr28 are fitly conserved in RpiA from all kinds of sources but have not been detected before.  
        关键词：ribose5phosphate isomerase A (RpiA);Acidithiobacillus ferrooxidans;structural model;molecular docking;ribose5phosphate (R5P)   
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      • Vol. 49, Issue 4, Pages: 99-105(2010)
        摘要：A breed trial was conducted on juvenile fish with initial body weight of(22.40±0.30 ) g for 8 weeks at controlled temperature in single recirculating system Fish meal and dehulled soybean meal were used as protein source. Five isonitrogenous (40% protein) and isoenergetic (15.8MJ/kg ) diets, with dehulled soybean meal replacing level 0%（CK）,15% , 30% , 45% and 60% of fish meal protein, were formulated to feed juveniles in order to investigate the effects of dietary dehulled soyabean meal replacing fish meal on the activity of digestive enzyme and intestinal tissue of Clarias lazera . The results indicated that pepsin activity of Clarias lazera in dehulled soyabean meal groups was significantly lower than that in control group （P＜0.05）.The activity of protease in the midintestine and the Hepatopancrea decreased significantly for 30% ,45% and 60% replacing level（P＜0.05）, the activity of protease in the anterior intestine and posterior intestine decreased significantly for 45% and 60% replacing level（P＜0.05）, and the activity of amylase in the posterior intestine was significantly lower than that in control group for 45% and 60% replacing level（P＜0.05）.But there were no significant difference in the activity of amylase in the stomach，anterior intestine and midintestine of Clarias lazera in each group （P＞0.05）. The dehulled soyabean meal had no significant effects on lipase of Clarias lazera(P＞0.05). Dehulled soyabean meal replacing fish meal had some effects on morphology of intestinal tissue of Clarias lazera. Meanwhile, the structural integrity of anterior intestine and midintestine in 45% and 60% group was destroyed, the part of intestinal villi shed, the part of epithelial cells and proper layer separated, the connective tissue of proper layer loosened, and the proper layer became wider. The length of intestine, index of intestine body, index of the length of intestine and the enteroplica height of intestine decreased significantly（P＜0.05）.  
        关键词：Clarias lazera;dehulled soyabean meal;protease;amylase;lipase;intestinal tissue   
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      • Vol. 49, Issue 4, Pages: 106-110(2010)
        摘要：Peroxidase (POD) isozyme and polyphenol oxidase (PPO) isozyme in the roots of 21 Brassica cultivars were studied by the technology of vertical slab polyacrylamide gel electrophoresis, and cluster analysis was made using UPGMA method. The results showed that Chinese cabbage, pakchoi, flowering Chinese cabbage and turnip were classified into subspecies or varieties of Brassica campestris L. Cabbage, purple cabbage, brussels sprouts, kale, cauliflower, broccoli, purple cauliflower, kohlrabi and Chinese kale were classified into subspecies or varieties of B.oleracea L. Leaf mustard and head mustard were classified into subspecies or varieties of B.juncea Coss. The genetic relationship of 3 groups of Brassica vegetables was analyzed at the protein molecule level and the isozyme fingerprint identifying them was determined.  
        关键词：Brassica;isozyme;fingerprint;cluster analysis   
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      • Vol. 49, Issue 4, Pages: 111-117(2010)
        摘要：DNA sequence comparisons of the mitochondrial COI, COII, and Cytb genes were used to infer phylogenetic relationships of partial genera and species of Cantatopidae, including 7 new species (〖WTBX〗Apalacris eminifronta〖WTBZ〗, 〖WTBX〗Caryanda pseudodentata〖WTBZ〗,〖WTBX〗 Caryanda bannaensis〖WTBZ〗,〖WTBX〗 Caryanda ruiliensis〖WTBZ〗, 〖WTBX〗Longchuanacris fui〖WTBZ〗,〖WTBX〗 Longchuanacris xiaoheishanensis〖WTBZ〗, 〖WTBX〗Podismodes dabieshanensis〖WTBZ〗). Phylogenetic trees were constructed using maximum likelihood and Bayesian inference. The combined results suggest several phylogenetic relationships including: ① 〖WTBX〗Longchuanacris〖WTBZ〗 is placed within the subfamily Caryandinae; ② 〖WTBX〗Sinopodisma〖WTBZ〗 and 〖WTBX〗Yunnanacris〖WTBZ〗 are both synonyms of〖WTBX〗 Podismodes〖WTBZ〗; ③　〖WTBX〗 Yupodisma 〖WTBZ〗is still a separate genus within Podisminae instead of a synonym of 〖WTBX〗Anapodisma〖WTBZ〗; 4）the molecular phylogeny of 7 new species is consistant with previous morphological phylogeny. This finding suggests a combination of molecular and morphological approaches are necessary for accurate species identification.  
        关键词：Cantatopidae;mtDNA;COI;COII;Cytb;molecular systematics   
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      • Vol. 49, Issue 4, Pages: 118-124(2010)
        摘要：Using the differential centrifugation technique and sequential chemical extraction method, effects of Cd on subcellular distribution and chemical form of Zn in multimetal hyperaccumulator Arabis paniculata Franch under nutrient solution culture were analyzed. Results show that the biomass of A. paniculata has no significant variance increased between before transplant and with Zn/Cd treated 21 days (p>0.05).The cadmium in the nutrient solution has no obvious influence on Zn absorption. NaCl, ethanol, water, HAc-extractable Zn are the predominant fractions in leaves of the plant,NaCl, ethanolextractable Zn are predominat fractions in root.Other chemical forms are very low in content.Zn is mainly distributed in cell wall and in karyon which suggests that cell wall and karyon in the plant are major storage for Zn. The cadmium in the nutrient solution has heightened the percentage of Zn in the cell wall and promoted the transportation of Zn to the cell wall, but it has no obvious influence on subcellular distribution and chemical form of Zn in A. paniculata Franch.  
        关键词：Arabis paniculata Franch.;subcellular distribution;chemical form;zinc   
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        发布时间：2023-12-11
      • Vol. 49, Issue 4, Pages: 125-128(2010)
        摘要：Considering the impacts caused by the landform patterns, sea level changes, sedimentary compaction and tectonic subsidence, the coastline of the Pearl River paleoestuary at 6 000 a BP is rebuilt based on the elevation contours in recent time and borehole data. The bathymetry of the Pearl River paleoestuary is reconstructed by using the waterdepth formula and Kring interpolation. Several error factors influencing the coastline and bathymetry, including local terrain changes, slope of piedmonts,and slope of upper reaches are discussed. The results show that special topographic structures of the Pearl River Delta make it possible to rebuild the coastline and bathymetry of the Pearl River paleoestuary. The Pearl River paleoestuary can be divided into inner and outer parts. There are lots of islands and several ancient channels of the West and North Rivers in the inner estuary. The contours of the outer estuary are parallel to those of the coastline.  
        关键词：Pearl River paleoestuary;coastline;bathymetry;longterm model   
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      • Vol. 49, Issue 4, Pages: 129-133(2010)
        摘要：The Pearl River Delta (PRD) is a complex river network system, its hydrodynamic process is controlled both by runoff and tide,different from other estuaries in the world. During the last 50 years, the PRD area had undergone some largescale human activities (such as floodgate building, sand excavation, channel regulation), which changed the morphology of the river bed, and resulted in the hydrodynamic characteristics different from the 1950s. 1D river network hydrodynamic model was developed to simulate the river flow of 1950s and 1990s.The results show that the water level in flood seasons of the PRD was significantly lower than that in 1950s,and the surface grads of two main rivers (Xijiang and Beijiang) were dropped from 7.2 cm/km and 7.1 cm/km to 4.1 cm/km and 4.9 cm/km,respectively. In dry seasons,the change was not so significant. A numerical experiment was conducted to figure out the impact of channel evolution on the hydrodynamic process.In the experiment, the water surface level of the Xijiang river and Beijiang were dropped from 7.1 cm/km and 7.2 cm/km to 4.2 cm/km and4.7 cm/km,respectively,under the same conditions,which indicates that the main reason for low of water level in the PRD was the change of river bed. The experiment also figures out that the dividedflow ratio was readjusted heavily where the river bed changed dramatically.  
        关键词：the Pearl River Delta;river network;hydrodynamics;human activities   
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      • Vol. 49, Issue 4, Pages: 134-138(2010)
        摘要：The daily NCEP/NCAR reanalyzed data and daily rainfall data from National Climate Center of China Meteorology Administrator for the period of 1958-2000 were employed to diagnose the dynamic and thermodynamic characteristics associated with the onset and retreat of South China Sea summer monsoon, as well as the differences compared with South Asian monsoon on climatological mean. Possible impacts of precipitation in the yearly first raining period in South China on the onset of South China Sea summer monsoon are explored. The conclusions are as follow: (1) The allocation of atmospheric dynamic and thermodynamic characteristics over the South China Sea is distinctively different from that in the Bay of Bengal and South Asia during seasonal transitions. Tropospheric temperature meridional gradients under 850 hPa reverse (from negative to positive) later than the onset of southwest monsoon in South China Sea. (2) Under the constraint of thermal wind relation, 850hPa westerly onsets when the tropospheric temperature meridional gradient at 925hPa and 1000hPa is still negative. (3) During seasonal transitions, the allocation of atmospheric dynamic and thermodynamic characteristics over the South China Sea is distinctive owing to the unique geographic position and the impact of cold air from middle latitudes. (4)With reinforcing rainfall in South China, convection latent heat on the middleupper troposphere favors the reverse of the temperature meridional gradient. South Asia high in the upper troposphere consequently moves northward under the constraint of thermal wind relation. Therefore, South China frontal raining in the yearly first raining period is a beneficial factor for the onset of South China Sea summer monsoon.  
        关键词：South China Sea Summer Monsoon;onset and retreat;dynamic and thermodynamic characteristics;South China frontal precipitation in the yearly first raining period   
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      • Vol. 49, Issue 4, Pages: 139-143(2010)
        摘要：Parameter uncertaity is one of main sources of the uncertainty in hydrological modeling and forecast. In this paper, BetaPERT distribution is employed to describe the distribution of parameters, using the Monte Carlo simulation method to study the effect of the distribution pattern of parameters on the uncertainty in hydrological modeling and forecast in the Hanzhong basin. The results show that the distribution of parameters had a significant effect on model output uncertainty.With the change of the coefficients of parameter variance from 7.6% to 37.8%,particularly from 7.6% to 15.1%,the width of the model output uncertainty interval markedly increases. The maximum uncertainty occurs when the coefficient of skewness is 0.61. The distribution pattern of parameters has more effect on the upper bound discharge at the significance level of 5% than the lower bound discharge.  
        关键词：BetaPERT distribution;hydrological model;distribution of parameter;uncertainty   
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        发布时间：2023-12-11
      • LI Songhua
        Vol. 49, Issue 4, Pages: 144-146(2010)
        摘要：Using trigonometric wavelets as trial functions and Galerkin method, the obtained stiffness matrix from discretization the hypersingular integral equation is symmetrical and circulant, which leads us to a fast numerical method based on fast Fourier transform. Furthermore, this method dont need to compute the entries of the stiffness matrix and overcome the drawback to solve generalized inverse matrix. The example states that it still has good accuracy when the accurate solution is almost singular.  
        关键词：hypersingular integral equation;trigonometric wavelets;matrix decomposition;FFT   
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      • ZHANG Cuixian,PENG Guangtian,HE Xixin,LIN Chaozhan,XIONG Tianqin,DENG Jiewei,ZHAO Zhongxiang
        Vol. 49, Issue 4, Pages: 147-149(2010)
        摘要：The chemical constituents and their biological activities of the Psychotria sp.were studied.Four polyphenolic compounds were isolated from the Psychotria sp. collected from Guangdong Qingpin TCM center. Their structures were determined as 11Osyringylbergenin (1), (2 R, 3 S, 4S, 4a R, 10b S) (-)bergenin (2), gallic acid (3)，methyl gallate (4) mainly by spectroscopic analysis. All of these compounds are firstly obtained in genus of 〖WTBX〗Psychotria  
        关键词：Psychotria;chemical constituents;structure   
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      • Vol. 49, Issue 4, Pages: 150-152(2010)
        摘要：Mangrove endophytic fungus is a new resource for drug discovery. ZSUH85A，a new anthraquinone，with azelaic acid and isopentenyl benzoate were isolated from mycelium of the Mangrove Entophytic Fusarium sp. ZSUH85（LK）from Hainan Province by silica gel column chromatography and sephadex LH-20 chromatogram. Their structure were elucidated using spectroscopic methods，primarily 2D NMR techniques.  
        关键词：mangrove endophytic fungus;anthraquinone;structure   
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