检索结果-南通市图书馆

A Modified Earthquake Model of Self-Organized Criticality on Small World Networks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第4期41卷 557-560页

作者： LINMin zhaoxiao-Wei CHENTian-Lun DepartmentofPhysics NankaiUniversityTianjin300071China

A modified Olami Feder-Christensen model of self-organized criticality on a square lattice with the properties of small world networks has been *** find that our model displays power-law behavior and the exponent τ o... 详细信息

关键词： self-organized criticality avalanche small world networks

Spatial and Temporal Behaviors in a Modified Evolution Model Based on Small World Network

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第2X期42卷 242-246页

作者： zhaoxiao-Wei ZHOULi-Ming CHENTian-Lun DepartmentofPhysics NankaiUniversityTianjin300071China

In this paper, we introduce a new modified evolution model on a small world network. In our model,the spatial and temporal correlations and the spatial-temporal evolve pattern of mutating nodes exhibit some particular behaviors different from those of the original BS evolution model. More importantly, these behaviors will change with φ, the density of short paths in our network.

关键词：演化模型自组织临界性小世界网络时空行为空间相关性时间相关性

Effects of Interactive Function Forms in a Self-Organized Critical Model Based on Neural Networks

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2003年第5X期40卷 607-613页

作者： zhaoxiao-Wei ZHOULi-Ming CHENTian-Lun DepartmentofPhysics NankaiUniversityTianjin300071China

Based on the standard self-organizing map neural network model and an integrate-and-fire mechanism, we introduce a kind of coupled map lattice system to investigate scale-invariance behavior in the activity of model neural populations. We let the parameter β, which together with α represents the interactive strength between neurons, have different function forms, and we find the function forms and their parameters are very important to our model''s avalanche dynamical behaviors, especially to the emergence of different avalanche behaviors in different areas of our system.

关键词：神经网络相互作用函数雪崩联合记忆学习过程自适应系统

Phosphorus limitation in biofiltration for drinking water treatment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2003年第4期15卷 494-499页

作者： YUXin ZHANGXiao-jian LIUXiao-ling zhaoxiao-dong WANGZhan-sheng DepartmentofEnvironmentalScienceandEngineering TsinghuaUniversityBeijing100084China. XuzhouWaterSupplyCompany Xuzhou221004China

Bacterial growth potential(BGP) method and two parallel pilot scale biofilters were used to investigate phosphorus limitation and its effect on the removal of organic matters in biofiltration for drinking water treatment. Addition of phosphorus can substantially increase the BGPs of the samples. Its effect was equivalent to that of addition of a mixture of various inorganic nutrients including phosphorus. The biofilter with phosphate added into its influent performed a higher biological stability of the effluent and a higher COD Mn removal than the control filter. These results suggested that phosphorus was the limiting nutrient in the biofiltration and the removal efficiency of organic matters could be improved by adding phosphate into the influent.

关键词： drinking water biological treatment biofilter limiting nutrient phosphorus carbon

Behaviour of Hexagon Split Ring Resonators and Left-Handed Metamaterials

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2004年第7期21卷 1330-1332页

作者： ZHANGFu-Li ZHAOQian LIUYa-Hong LUOChun-Rong zhaoxiao-Peng InstituteofElectrorheologicalTechnology DepartmentofAppliedPhysicsNorthwesternPolytechnicalUniversityXi'an710072

We used a rectangular waveguide system to measure the X-band (8-12 GHz) transmission of hexagon split ring resonators (SRRs) alone and the left-handed metamaterials (LHMs) consisting of hexagon SRR array and wire array. The experimental results show that for an individual SRR, the resonance frequency increases with the azimuthal gap, but decreases with the radial gap. For two identical SRRs, the resonance peak has a shift because of the electromagnetic interaction, and the resonance frequency and the strength decrease with the separation distance. Finally, we demonstrate the left-handed effect of the LHMs.

关键词： Ring gages

Preparation and Characterization of Aromatic Polybenzoxazoles Copolymers Containing 2,6-Naphthalene Units

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2004年第5期20卷 652-655页

作者： LILei zhaoxiao-dong ZHOUJing-lun CHENXiao-fang WANXin-hua ZHOUQi-feng DepartmentofPolymerScienceandEngineering CollegeofChemistryandMolecularEngineeringPekingUniversityBeijing100871P.R.China

A series of polybenzoxazoles(co)polymers bearing crankshaft units in the main chain was synthesized by the conventional solution polycondensation of 4,6-diaminorescinol dihydrochloride, terephthalic acid(TA) and 2,6-naphthalene dicarboxylic acid(NDA). All of the polymers show lyotropic liquid crystal behavior in polyphosphoric acid(PPA) and methanesulfonic acid(MSA). The polybenzoxazoles exhibit an excellent thermal resistance although the crankshaft monomer has been introduced into the polymer backbone. The temperature for the 5% weight loss of all the polymers is above 600 ℃.The X-ray diffraction analysis results show that the series of the polymers has a high crystallinity. The introduction of NDA makes a slight decrease in the thermal resistance of the polymers. The maximum absorption peak in the UV-Vis spectra can be adjusted according to the amount of 2,6-naphthalene units in the polymers, which indicates the potential application of the polymers as optoelectric materials.

关键词： Polybenzoxazoles Copolymer Liquid crystal Thermal resistance

A Facile Route to Rapid Synthesis of Soluble Monodisperse Oligo(1,4-phenyleneethynylene)s

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2005年第4期21卷 505-507页

作者： LIGuo-rong WANGXian-hong LIJi zhaoxiao-jiang WANGFo-song StateKeyLaboratoryofPolymerPhysicsandChemistry GraduateSchooloftheChineseAcademyofSciencesChangchunInstituteofAppliedChemistryChineseAcademyofSciencesChangchun130022P.R.China

Recently, much attention has been paid to monodisperse, well-defined conjugated oligomers as candidates for molecular wires and molecular scale electronic devices[1-7]. Shape persistent oligo(1,4-phenyleneethynylene)s are especially attractive for their excellent main-chain rigidity and interesting electronic characteristics[3-7]. Different iterative divergent/convergent routes have been reported by several groups for the rapid synthesis of oligo(1,4-phenyleneethynylene)s. Godt et al.[5]

关键词： Monodisperse Oligo(1,4-phenyleneethynylene)s Synthesis

A NEW APPROACH TO DVC COMBINED WITH ROI EXTRACTION AND RESIDUAL VIDEO CODING FOR MULTIMEDIA SENSOR NETWORKS

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2013年第1期30卷 17-24页

作者： Lin zhaoxiao Sun Lijuan Xiao Fu Wang Ruchuan College of Computer Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education Jiangsu Province

The Wyner-Ziv distributed video coding scheme is characterized for its intraframe encoder and interframe decoder which can also approach the efficiency of an interframe encoder-decoder system. In Wyner-Ziv residual coding of video, the residual of a frame with respect to a reference frame is Wyner-Ziv encoded, which can reduces the input entropy and leads to a higher coding efficiency than directly encoding the original frame. In this paper, we propose a new approach of residual coding combined with Region Of Interest (ROI) extraction. Experimental results show that, the proposed scheme achieves better rate-distortion performance compared to conventional Wyner-Ziv coding scheme.

关键词： Distributed Video Coding (DVC) Residual video coding Region Of Interest (ROI)

Diversity of Phosphate-Dissolving Microorganisms in Corn Rhizosphere

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2003年第2期2卷 222-228页

作者： zhaoxiao－rong LINQi－mei 等 DepwartmentofSoilandWaterSciences ChinaAgriculturalUniversityBeijing100094P.R.China

Rhizosphere and nonrhizopshere soils were sampled during corn growth. Total, inorganic phosphate-dissolving and lecithin-mineralizing bacteria, fungi and actinomyctes were determined by plate counting method. Generally, the rhizosphere soil contained around 5 to 100 times more of these bacteria and fungi than the non-rhizosphere soil. However, the actinomycetes in the rhizosphere soil were significantly lower than those in the non-rhizosphere soil. The numbers of these microorganisms didn't significantly change during corn growth in the soils. However, the proportion of the phosphate-dissolving microorganisms in the total changed markedly during corn growth. Generally there were much higher percentages of phosphate-dissolving bacteria and phosphate-dissolving fungi in the rhizosphere soil than the nonrhizosphere soil. More than 90% of the fungi in rhizosphere dissolved inorganic phosphate at the seedling period, but this proportion declined to 20% at the harvesting time. The community of phosphate-dissolving microorganisms also changed during corn growth. Bacillus was dominant in the nonrhizosphere soil. However, in the rhizosphere, Pseudomonas and Enterobacter became predominant. Penicillium and Streptomyces were the main fungi and actinomycetes capable of dissolving phosphate.

关键词： Corn Rhizosphere Phosphate-dissolving microorganisms