最新刊期
      卷 49 ， 期 2 ， 2010
      • Vol. 49, Issue 2, Pages: 1-7(2010)
        摘要：The online solution of underdetermined linear equations is investigated by using two types of artificial neural networks (ie., BP and Hopfieldtype neural networks). Although they differ from each other in terms of origins, network definition, structures and learning patterns, the BP and Hopfieldtype neural networks could be exploited for solving online such underdetermined linear equations and even possess a common mathematical formulation of learning and common computational abilities. In addition, based on zero initial values, the same but nonzero initial values and different random initial values, computersimulation and verification results are given. These substantiate well the efficacy and commonness of such two types of neural networks on solving underdetermined linear equations.  
        关键词：underdetermined equation;BP neural network;Hopfield neural network;common nature of learning   
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      • CHEN Zhenhua,,DENG Shanzhi
        Vol. 49, Issue 2, Pages: 8-12(2010)
        摘要：Key words:field emission display,video signal processing,DSP,FPGA.  
        关键词：field emission display;video signal processing;DSP;FPGA.   
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      • JU Zhiping,CAO Wufei,LIU Xiaowei
        Vol. 49, Issue 2, Pages: 13-16(2010)
        摘要：Beam spreading is the foundation of proton therapy with large area and depth tumour.The characteristics of proton lateral beam distribution for dualring double scattering system are investigated using Monte Carlo multiparticle transport code Fluka and the results are compared with analytical computation, when the same radius of beam spreading is considered. It is found that the first scatterer is thinner than the results obtained from analytical computation and they are coincided better with thinfoil than thickfoil. For dualring double scattering system, as the thickness of foils increase, the radius of beam spreading increase, but the efficiency of beam use increase firstly and then decrease, the maximum value is about 27%.  
        关键词：Monte Carlo;proton therapy;beam spreading;lateral beam distribution   
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      • PENG Zhiyong,TAN Honzhou,ZHU Xiongyong,CHEN Faling
        Vol. 49, Issue 2, Pages: 17-21(2010)
        摘要：Motion blur is one of main challenges for using LCDs in television applications. An effective method for reducing the motion blur by blind signal processing was proposed. In this method,the LCD motion blur images are obtained by the MPRT(Motion Picture Response Time), and the motion vectors are estimated using the cepstral method, then the motion vectors are used in a premodel for LCD motion blur image,and finally an initialization point spread function(PSF) of blind deconvolution can be constructed. The simulation results show that the proposed blind deconvolution can significantly reduce the visible blurring artifact on LCD.  
          
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      • Vol. 49, Issue 2, Pages: 22-27(2010)
        摘要：An 80 magnitude earthquake attacked the northwestern margin of the Sichuan Basin on May 12, 2008. A large number of buildings suffered damage to different degree in the epicenter regions. Sichuan University reconnaissance team investigated the performance of residential masonry structure buildings with ground R.C. frame for commercial purpose following the Earthquake. This kind of structure style is widely taken in the epicenter area. Many of them suffered severe damage or even collapsed totally, however, some of them had perfect performance during the Earthquake. Many structural deficiencies and mistakes were highlighted, which including excessive horizontal displacement in the ground, more severe damaged transition layer (the first masonry structure layer), ground with farraginous structure, and poor construction quality. Finally, lateral stiffness ratio of the second to ground story in masonry buildings with RC frame structure at the bottom will be optimized following difference of materials between the ground floor and the upper floors. The strength and the ductility of transition layer, as well as shear walls in the ground floor, are crucial to keep the building standing during large earthquake.   
        关键词：Wenchuan earthquake;masonry structure building with ground RC frame;damage characteristics;seismic property   
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      • LIU Hongxiu,LI Hongbo,LI Weidong,LUO Dehan
        Vol. 49, Issue 2, Pages: 28-30(2010)
        摘要：The freshness on four selected types of fish (Red Snapper, Gurnard, Tarakihi and Trevally) which are the most common fish in the New Zealand market was investigated. A portable Cyranose 320 Enose was used in our experiments under the same laboratory condition. It converted the odour of four selected types of fish to smell prints over days 1, 2, 5, 6, 7, 8, 9, and 10 after catching the fish (no data was collected on days 3 and 4). Approximately 2 000 samples were collected by each sensor during each process. About 2 048 000 data samples ［4 (fish) × 8 (days) ×32 (sensors) ×2 000 (samples) =2 048 000］ were obtained. Extracted features from the Enose sensors and artificial neural network （ANN）were used to assess the freshness of the fish by classifying the smell print data according to the day of data collection. The proposed system has been successful in identifying the number of days after catching the fish with an accuracy of up to 91%. The result showed that the proposed network architecture proved very suitable for fish freshness assessment.  
        关键词：electronic nose;information processing;artificial neural network;fish freshness assessment   
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      • Vol. 49, Issue 2, Pages: 31-36(2010)
        摘要：The audio mixing algorithm determines the quality of the mixing voice in the unicast based centralized multimedia conference system. However, the implementation of the mixing algorithm is based on the backup of synchronous audio mixing and transmitting mechanism. The circular mixing buffer (CMB) proposed by Perkins is analyzed, and then a realtime synchronous audio mixing and transmitting scheme is presented. This scheme is achieved by setting multiCMBs and controlling them synchronously. The length of data used for mixing is decided by the one of data storing in the soundcard buffer which reflects operating system (OS) scheduling. This can alleviate the influence of OS scheduling on the audio mixing operation. Experiment results manifest that our scheme is feasible and steady.  
        关键词：centralized multimedia conference system;audio mixing;circular mixing buffer;synchronization;system scheduling   
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      • DAI Hongliang
        Vol. 49, Issue 2, Pages: 37-42(2010)
        摘要：SVM has been successfully employed to solve the analysis of gene expression data. However, there are still open issues which need to be addressed: ① SVM does not offer the mechanism of automatic internal relevant feature selection; ② There are no simple and effective means to confirm the appropriate parameters setting of SVM. In this study, total marginbased adaptive fuzzy support vector machine (TAFSVM) which has good quality is proposed. In addition, it is proposed an evolutionary approach to design a TAFSVMbased classifier (named ITAFSVM) by simultaneous optimization of automatic feature selection and parameters tuning using an intelligent genetic algorithm (IGA), combined with 10fold crossvalidation regarded as an estimator of generalization ability. Subsequently, the model of ITAFSVM is used to analyze four gene expression datasets. Comparisons with evolutionary support vector machine and a combination of roughbased feature selection and RBF neural network are reported. The experimental results indicate that the proposed ITAFSVM model can not only accomplish automatic feature selection, but also achieve higher classification accuracy, stable and faster speed.  
        关键词：total marginbased adaptive fuzzy support vector machine;intelligent genetic algorithms;gene expression;classification;microarray   
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      • ZHANG Meiling,LIU Jingmei,WANG Xinmei
        Vol. 49, Issue 2, Pages: 43-47(2010)
        摘要：SMS4 is a 128bit block cipher used in WAPI, the Chinese WLAN national standard. A new 18round differential characteristic of SMS4 is presented, basing on which the 22round SMS4 is attacked. The attack requires 2117 chosen plaintexts, 2112 bytes of memory and 2123 22round encryptions. And the attack is the best differential cryptanalytic result on SMS4.  
        关键词：SMS4;differential cryptanalysis;time complexity;data complexity   
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      • GUO Zijun
        Vol. 49, Issue 2, Pages: 48-52(2010)
        摘要：A class of predatorprey system of two species with ratiodependence is studied. According to the theory on stochastic differential equation, by constructing the Lyapunov function, and combining with stopping time and some analysis techniques, the existence and uniqueness of global solution for the system are proved. The boundedness and asymptotic estimate of the global solution are also discussed.  
        关键词：predatorprey system;Brownian motion;stochastic differential equation;global solution;K.itó formula   
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      • ZHANG Jingdan
        Vol. 49, Issue 2, Pages: 53-59(2010)
        摘要：A graphbased hierarchical clustering (GBHC) method for brain MR image segmentation is presented. Firstly, the standard graphbased method is applied to produce a coarse segmentation of brain MR image. However, the segmentation result of the graphbased method is oversegmentation because of the complicated structure of brain. So, we apply an adaptive function to control the value of parameter kin the graphbased method, which integrates the information from the highfrequency subbands of dualtree complex wavelet transform. Then, the hierarchical clustering method is used to merge the oversegmented regions in the segmentation result. The method is validated by extensive experiments using real T1weighted MR images, and compared with the stateoftheart algorithms.  
        关键词：graphbased method;dualtree complex wavelet transform;image segmentation;brain MR image;hierarchical clustering method   
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      • Vol. 49, Issue 2, Pages: 60-64(2010)
        摘要：The ionic liquid of 1butyl3methylimidazolium chloride (BmimCl) was used as a good solvent to dissolve cellulose. The rheological properties of the cellulose ionic liquid (MCC/BmimCl) solutions were investigated by steady shear and oscillatory shear measurements. The results indicated that all the MCC/BmimCl solutions showed a shear thinning behavior at both high shear rates and low shear rates. The concentration of MCC/BmimCl solution and temperature had an important influence on the viscoelastic properties of MCC/BmimCl solution. Cross viscosity model was used to fit experimental data of complex viscosity, and the activation energies for shear flow were determined using Arrhenius formula.  
        关键词：microcrystalline cellulose;ionic liquids;1butyl3methylimidazolium chloride;shear rheology;activation energy   
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      • Vol. 49, Issue 2, Pages: 65-67(2010)
        摘要：Diosgenin in radix ophiopogonis was determined by capillary electrophoresis with amperometric detection(CEAD).The affected conditions, such as the running buffer pH value (pH), the types of running buffer, the concentration of running buffer, the detection potential, the applied voltage and the sampling time were investigated. The optimized condition was in a running buffer composed of 30 mmol/L Na2B4O7buffer at a pH 9.5, separation voltage at 15 kV, injection time for 5 s, organic additive for 7% methanol and detection potential at 0.4 V. A linear relation between peak area(Y) and mass concentration of diosgenin (c) was obtained in the range of 1～100mg·L-1 (r=0.999 5) and the determination limit is 0.1 mg·L-1  
        关键词：capillary electrophoresis;diosgenin;amperometric detection   
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      • WEI Meiyan,HU Guping,ZHENG Caijuan,SHAO Changlun,WANG Changyun,ZHOU Shining,SHE Zhigang,Lin Yongcheng
        Vol. 49, Issue 2, Pages: 68-71(2010)
        摘要：Key words:mangrove endophytic fungus,secondary metabolites,dihydroisocoumarin  
        关键词：mangrove endophytic fungus;secondary metabolites;dihydroisocoumarin   
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      • Vol. 49, Issue 2, Pages: 72-78(2010)
        摘要：The heat shock protein 90 (HSP 90) gene from Harmonia axyridis (Pallas) was cloned using techniques of homological cloning and anchored PCR. The full length of cDNA sequence is 2 480 bp（Genbank number: FJ501962）, containing a 3′UTR (untranslated region) of 200 bp, a 5′UTR of 126 bp, and an ORF of 2 154 bp which encodes a polypeptide of 717 amino acids with an estimated molecular weight of 82 230 and p I of 4.96. There are no glycosylation sites, putative transmembrane domain and signature peptide. It contains ATPase conservative domain of (HSP90) in Nsite and EEVD signature sequence on Csite. Compared with Tribolium castaneum, they are 90% identities and Phylogenetic analysis shows that these two species are most closely related. Cloning and comparison analysis of HSP 90 genes from Harmonia axyridis (Pallas) could be useful in the studies of antistress mechanism, tolerance improvement breeding and evolution for these animals.  
        关键词：Harmonia axyridis;HSP 90;cloning;characterization analysis;sequence analysis   
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      • JIA Fenglong
        Vol. 49, Issue 2, Pages: 79-85(2010)
        摘要：Quaternary Glacier took an important impaction to the modern insect fauna of China. Many species from Palearctic region are distributing in Yunnan, Hainan and Taiwan due to Quaternary Glacier, which are the palearctic species distributed the southern end of China. Quaternary Glacier played very important role in formation of mountain genera and species, endemic genera and species in southern China. Palearctic and Oriental Regions should be based on Huaihe River as dividing line. A part of endemic species of China are the survival of ancient species from Europe or Far East of Russia. Glaciers drove some species from Palearctic region to south and extended further to Southeast Asia and South Asia. After theses species successfully settled in Oriental region, PalearcticOriental species eventually formed.  
        关键词：insect fauna;quaternary glacier;biogeography;China   
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      • Vol. 49, Issue 2, Pages: 86-89(2010)
        摘要：Rice plants released complex volatiles that were considered as signal molecules respond to insects. Methyl jasmonate (MeJA), Methyl salicylate (MeSA) and Linalool (Lin) were three of the most important. They can induce chemical defenses of the plants directly or indirectly. In order to understand the effects of rice volatiles on the community structure and olfactory behavior of arthropods in the rice field, the effects of three volatiles on the arthropods population and community in the fields were studied in this paper; and the electroantennogram responses of three volatiles were the other focus in this paper The results showed that MeSA can influenced the density of insects marked. In the later paddy field, the insect density of MeSA treated group was significant more than other groups. The higher the concentrations of Linalool and MeJA are, the more scopes of the Parasitoids EAG changed. The EAG changes of the Parasitoids stimulated by 1/50 MeJA and Linalool were much more higher than the EAG changes when stimulated by 1/5000.  
        关键词：Methyl jasmonate;Methyl salicylate;Linalool;arthropods in the rice field;olfactory behavior   
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      • Vol. 49, Issue 2, Pages: 90-94(2010)
        摘要：Heavy metal pollution is an important factor in affecting rice growth and quality of rice. Among all kinds of heavy metal pollution, the cadmium pollution is the most serious one. It is not very clear about the mechanisms of rice responding to cadmium and the measures dealing with pollution. In this paper, to investigate the molecular mechanism of rice response to the Cd treatment (05 mM) and to search for rice genes associated with these mechanisms, suppression subtractive hybridization and mirror orientation selection were conducted to construct cDNA libraries with Cd and nonCd treatment rice (Oryza sativa L., Nipponbare) seedling roots, and cDNA microarray for these two materials was conducted. The results of this study will help to clarify the molecular mechanisms of rice responding cadmium stress, and provide a way of isolating genes involved in heavymetal resistance in rice.  
        关键词：cadmium;suppression subtractive hybridization (SSH);Oryza sativa L.   
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      • Vol. 49, Issue 2, Pages: 95-99(2010)
        摘要：The effects of simulated acid rain on leaf litter decomposition of Phyllostachys pubescens were studied by litterbag methods in Lin'an City of Zhejiang Province since September 2006, which is in severe acid rain stress regions. Three simulated acid rain treatments were applied to the litter decomposition: severe acid rain (pH 2.5), moderate acid rain (pH 4.0) and control (pH 5.6). There were three repeats in each treatment. The results showed that the litter decomposition rate of P. pubescens leaf has been slowed down with the increase of the stress grade of acid rain. The litter decomposition rate of P. pubescens leaf was the fastest in the control treatment (decomposition rate is 0.69), was medium in the moderate acid rain stress (0.57), and was the lowest in the severe acid rain stress (0.33). Time for 95% of 〖WTBX〗P. pubescens litter has been decomposed under the severe acid rain stress, moderate acid rain stress and control treatment are 9.08a, 5.26a and 4.34 a, respectively. The sensitivity of the litter decomposition rate of P. pubescens leaf to acid rain has become strong with the increase of the acid stress.  
        关键词：acid rain;Phyllostachys pubescens;litter decomposition   
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      • DENG Zujun,,CAO Lixiang,ZHOU Shining
        Vol. 49, Issue 2, Pages: 100-104(2010)
        摘要：Key words:mangrove plants,fungal endophytes,metabolites,bioactivity  
        关键词：mangrove plants;fungal endophytes;metabolites;bioactivity   
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      • CHEN Yangbo,,HUANG Fenghua,XU Huijun,REN Qiwei
        Vol. 49, Issue 2, Pages: 105-112(2010)
        摘要：The Liuxihe Model is a physically based distributed hydrological model for catchment flood forecast which consists of 5 components, including catchment dividing, evaporation, runoff production, runoff routing and parameter deriving. The Liuxihe Model was set up in the Liuxihe Reservoir basin of upstream Liuxihe catchment at a spatial resolution of 100 m. The grid type was categorized and the river channel crosssection size was estimated, and also the model parameters were derived referring to the simulation results from an observed flood event. Twelve observed flood events were simulated with the derived model parameters and reasonable results were acquired. The studied basin was divided into 52853 grids. It only took 12 seconds to simulate one stage flood discharge on a general desktop PC. The results show that water content at saturation, soil thickness and channel Mannings coefficient are highly sensitive model parameters, water content at field condition, soil porosity parameter b, hydraulic conductivity and hillslope Mannings coefficient are sensitive model parameters, while water content at wilting condition, potential evaportranspiration, evaportranspiration coefficient and underground water recession coefficient are insensitive model parameters.  
        关键词：Liuxihe model;channel crosssection size estimation;flood simulation;model parameter deriving;sensitivity analysis   
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      • LIU Zengmei,,CHEN Zhishen
        Vol. 49, Issue 2, Pages: 113-118(2010)
        摘要：The analysis of floods meeting with tides and the rational selection of the combination of floods and tides are vitally important in planning design for the tide affected rivers. The model for the risk probability of the combination of floods and tides was established in this paper. Firstly, the different copula functions were used to build the bivariate joint distribution of annual maximum flood discharge and its corresponding tidal level and the annual maximum tide level and its corresponding flood discharge, respectively. Then, based on both mentioned above the risk probability analysis models for the combination of floods and tides were put forward. The case study of the combined risk probability of floods and tides for the estuary of the Moyang River was conducted. The results indicated: (1) The combinatorial risk probability of the design flood discharge with the fiftyyear return period and the average value of annual maximum tide level was 6。89％; (2) The combinatorial risk probability of the design tide level with the fifty-year return period and the average value of annual maximum flood discharge was 4。77％. The models for combined probability of the floods and the tides can be used to measure the risk probability of the combination of floods and tides, which can provide scientific basis for the rational selections for the combined probability of floods and tides.  
        关键词：floods meeting with tides;the combination of floods and tides;risk probability of the combination;copula functions;joint distributions   
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      • WANG Lina,CHEN Xiaohong,LI Yuean
        Vol. 49, Issue 2, Pages: 119-124(2010)
        摘要：Based on six flood indexes, presenting time domain and dynamic characteristic, a concept of the flood energy level is proposed in this paper. The fuzzy kmeans cluster model with simulation annealing algorithm is used to calculate the flood energy level. The value of flood energy level is obtaind from the most superior objective function. The Beijiang catchment is taken as a case study. The results show that the hydraulic engineering can improve the basin defense performance, which has transferred from an open to a defense basin, with reducing possibility of the flood energy level diameter jumps. The reasonable human activities can weaken the branch flood energy level and alleviate the flood prevention pressure. The concept of flood energy level and its computation model have provided new methods for flood classification, frequency computation and flood disaster appraisal and can be applied in other domains.  
        关键词：simulation annealing;fuzzy kmeans cluster;human activity;the flood energy level;humanwater harmony   
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      • Vol. 49, Issue 2, Pages: 125-129(2010)
        摘要：By using the precipitation data of 47 basic stations in South China and the water vapor transport flux calculated from the NCAR/NCEP II reanalyzed data from 1979 to 2005, the characteristics of droughts in South China in spring and its relationship with water vapor transport flux are studied. The results show that precipitation in South China in spring can be partitioned into two classes. Region I, located in the east of 110.5 °E, is characterized by the first class, showing an outstanding decreasing trend in rainfall. Region II, located in the west of 110.5 °E , is marked by the second class with unconspicuous decreasing tendency in reainfall. In 1994, there was an abrupt decrease in rainfall in region I. The moisture source of South China is located in the South China Sea and western Pacific Ocean. The water vapor is transported to South China via the southern Indochina peninsula. When the southern water vapor transport is weaker/stronger over the central and northern South China Sea, the precipitation in region I correspondingly becomes weaker or stronger and droughts or floods develop. While the southern moisture transport is weaker or stronger over the southwestern South China Sea and southern Indochina peninsula, droughts or floods prevail in region II.  
        关键词：South China;precipitation in spring;water vapor transportation   
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      • Vol. 49, Issue 2, Pages: 130-137(2010)
        摘要：Extensional structures developed widely in West Shandong uplift. The characteristics of the NWtrending extensional faults in West Shandong uplift are studied based on detailed field geological survey. The tectonic kinematical parameters of each main tectonic evolution stages since late Mesozoic are calculated quantitatively using balance profile restoration along a selected profile crossing the main NWtrending faults. In addition, the process of extensional deformation is demonstrated using the structural physical modeling. The results indicate that the main NWtrending faults reversed negatively after Triassic and dominated the depositions of the adjacent depressions. In late Mesozoic, West Shangdong uplift was subjected to strong extension, and the cutting depth of the normal faults reached to 19~20 km underground. And breccia, cataclasite and fault gouge developed in the fault belt. In the Paleogene, the crustal extension mainly occurred in shallow strata. The extension amount and extensional rate of the West Shandong uplift increased to their maximum. All of those show that the West Shandong uplift suffered intensive extension. The activity rates of the NWtrending faults reached peak. Halfgraben developed massively and widely. Then,in the Neogene, extension rates becane small and faults hardly activated, indicating that the West Shandong uplift approximately trended to be stable. The extension of the West Shandong uplift since late Mesozoic coincided with the tectonic evolution of the North China Craton. The strong extension in the Cenozoic is controlled by the change of the direction and the velocity of the subduction between the Pacific Plate and the Eurasian Plate, and the collision of the Indian to the Eurasian plates.  
        关键词：normal fault;structural physical modeling;West Shandong uplift;Late MesozoicCenozoic   
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      • LIU Zhiyan,,TIAN Yaowu,CHEN Guizhu
        Vol. 49, Issue 2, Pages: 138-144(2010)
        摘要：The accumulation and translocation of metals Fe, Cu, Zn, Pb, As and Cd in different parts (rice core, rice hull, straw, root, iron plaque and root system) of 21 rice varieties referred to three common rice cultivars (hybrid, conventional and glutinous) were studied through the field experiment in heavy metal polluted soils in the Dabao Mountain of Shaoguan, Guangdong province. The contents of the six experimental metals were higher in underground parts (root system) than in overground parts. Metal concentrations in different parts of rice showed significant differences among various rice cultivars (P<0.01). Conventional and glutinous rice had stronger ability to accumulate Fe, Cu, Zn, Pb and Cd than hybrid rice. Hybrid rice had stronger ability to accumulate As than the other two cultivars. Hybrid rice was more applicable to Fe, Cu, Pb, Zn and Cd polluted soils. Glutinous rice was more applicable to As polluted soils. The accumulation factors of Zn, Pb and As followed the order of root system>straw>rice hull>rice core. The accumulation factors of Fe, Cu and Cd followed the order of root system>straw>rice core>rice hull. The values of accumulation factors of Fe、Zn、Pb、As and Cd are higher in iron plaque than in root, with the exception of Cu. The ability to accumulate different metals by iron plaque was different, with the rank of Cd>As>Fe>Zn>Pb>Cu.  
        关键词：combined pollution;rice;cultivar;accumulation;translocation   
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        发布时间：2023-12-11
      • Jian Runqiang
        Vol. 49, Issue 2, Pages: 145-147(2010)
        摘要：Quantum de Rham complex was first constructed and studied by Woronowicz. It is the quantization of the de Rham complex on Lie groups. It is one of the main objects being studied in noncommutative differential geometry. The comodule structure of the quantum de Rham cohomology and other properties are discussed. And a vanishing theorem of the quantum de Rham bicomplex is proved.  
        关键词：quantum de Rham cohomology;comodulealgebra;vanishing theorem   
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      • Vol. 49, Issue 2, Pages: 148-150(2010)
        摘要：The chemical constituents of Vernonia spirei Gandog were studied. The constituents were separated and purified from MeOH extract of the whole plant with column chromatographic methods through silica gel, RP18 silica gel, Sephadex LH20, HPLC, and preparative TLC. Their chemical structures were characterized by spectroscopic methods including NMR and EIMS. The result showed that Vernonia spirei Gandog contained two components including 5,7,4〖DK〗’trihydroxy6,3 ’dimethoxyflavone(Ⅰ), 5,3 ’dihydroxy6,7,4 ’trimethoxyflavone(Ⅱ). These compounds were obtained from this genus for the first time.  
        关键词：Vernonia spirei Gandog;flavones   
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