World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering最新文献_第7页

Optical Limiting Characteristics of Core-Shell Nanoparticles 核壳纳米粒子的光学限制特性

World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering Pub Date : 2010-04-21 DOI: 10.1142/S0218863510005510

G. Vinitha, A. Ramalingam

{"title":"Optical Limiting Characteristics of Core-Shell Nanoparticles","authors":"G. Vinitha, A. Ramalingam","doi":"10.1142/S0218863510005510","DOIUrl":"https://doi.org/10.1142/S0218863510005510","url":null,"abstract":"TiO2 nanoparticles were synthesized by hydrothermal method at 180°C from TiOSO4 aqueous solution with 1 m/l concentration. The obtained products were coated with silica by means of a seeded polymerization technique for a coating time of 1440 minutes to obtain well-defined TiO2@SiO2 core-shell structure. The uncoated and coated nanoparticles were characterized by using X-Ray diffraction technique (XRD), Fourier Transform Infrared Spectroscopy (FT-IR) to study their physico-chemical properties. Evidence from XRD and FTIR results show that SiO2 is homogenously coated on the surface of titania particles. FTIR spectra show that there exists an interaction between TiO2 and SiO2 and results in the formation of Ti-O-Si chemical bonds at the interface of TiO2 particles and SiO2 coating layer. The open aperture z-scan was carried out in both pulsed and CW laser. The RSA observed using CW laser and effective three-photon type absorption seen using pulsed laser at this wavelength, is of potential application in fabricating optical limiting devices. The non linear optical limiting properties of TiO2 and TiO2@SiO2 nanoparticles dispersed in ethylene glycol were studied at 532 nm using 5 ns Nd:YAG laser pulses and diode pumped Nd:YAG laser. Results indicate that these compounds are a potential candidate for low-power optical limiting applications and it is seen that the optical nonlinearity is enhanced in core-shell structures when compared with single counterparts.","PeriodicalId":23764,"journal":{"name":"World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering","volume":"1 1","pages":"490-492"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79795559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Mobile Robot Path Planning In A 2-Dimentional Mesh 二维网格中的移动机器人路径规划

World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering Pub Date : 2010-02-23 DOI: 10.5281/ZENODO.1075250

D. Dalalah

{"title":"Mobile Robot Path Planning In A 2-Dimentional Mesh","authors":"D. Dalalah","doi":"10.5281/ZENODO.1075250","DOIUrl":"https://doi.org/10.5281/ZENODO.1075250","url":null,"abstract":"A topologically oriented neural network is very\u0000efficient for real-time path planning for a mobile robot in changing\u0000environments. When using a recurrent neural network for this\u0000purpose and with the combination of the partial differential equation\u0000of heat transfer and the distributed potential concept of the network,\u0000the problem of obstacle avoidance of trajectory planning for a\u0000moving robot can be efficiently solved. The related dimensional\u0000network represents the state variables and the topology of the robot's\u0000working space. In this paper two approaches to problem solution are\u0000proposed. The first approach relies on the potential distribution of\u0000attraction distributed around the moving target, acting as a unique\u0000local extreme in the net, with the gradient of the state variables\u0000directing the current flow toward the source of the potential heat. The\u0000second approach considers two attractive and repulsive potential\u0000sources to decrease the time of potential distribution. Computer\u0000simulations have been carried out to interrogate the performance of\u0000the proposed approaches.","PeriodicalId":23764,"journal":{"name":"World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering","volume":"36 1","pages":"220-227"},"PeriodicalIF":0.0,"publicationDate":"2010-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76367675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Bifurcation Analysis in a Two-neuron System with Different Time Delays 一类具有不同时滞的双神经元系统的分岔分析

World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering Pub Date : 2010-01-28 DOI: 10.5281/ZENODO.1084979

Changjin Xu

引用次数: 0

Numerical Investigation of Two-dimensional Boundary Layer Flow Over a Moving Surface 移动表面上二维边界层流动的数值研究

World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering Pub Date : 2010-01-22 DOI: 10.5281/ZENODO.1085422

Mahmoud Zarrini, R. Pralhad

引用次数: 1

Magnetohydrodynamic Damping of Natural Convection Flows in a Rectangular Enclosure 矩形围护结构中自然对流流动的磁流体动力阻尼

World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering Pub Date : 2010-01-01 DOI: 10.5772/7589

M. Battira, R. Bessaih

引用次数: 0

Adaptive Functional Projective Lag Synchronization of Lorenz System Lorenz系统的自适应功能投影滞后同步

World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering Pub Date : 2009-12-26 DOI: 10.1999/1307-6892/6425

Tae H. Lee, J. H. Park, S. M. Lee, H. Jung

引用次数: 0

Position Vector of a Partially Null Curve Derived from a Vector Differential Equation 由矢量微分方程导出的部分零曲线的位置矢量

World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering Pub Date : 2009-11-22 DOI: 10.5281/ZENODO.1059869

S. Yılmaz, E. Özyilmaz, M. Turgut, Şuur Nizamoğlu

引用次数: 2

Reflection of Plane Waves at Free Surface of an Initially Stressed Dissipative Medium 初应力耗散介质自由表面平面波的反射

World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering Pub Date : 2009-11-01 DOI: 10.5772/7424

M. Selim

{"title":"Reflection of Plane Waves at Free Surface of an Initially Stressed Dissipative Medium","authors":"M. Selim","doi":"10.5772/7424","DOIUrl":"https://doi.org/10.5772/7424","url":null,"abstract":"The paper discuses the effect of initial stresses on the reflection coefficients of plane waves in a dissipative medium. Basic governing equations are formulated in context of Biot's incremental deformation theory. These governing equations are solved analytically to obtain the dimensional phase velocities of plane waves propagating in plane of symmetry. Closed-form expressions for the reflection coefficients of P and SV waves’ incident at the free surface of an initially stressed dissipative medium are obtained. Numerical computations, using these expressions, are carried out for a particular model. Computations made with the results predicted in presence and absence of the initial stresses and the results have been shown graphically. The study shows that the presence of compressive initial stresses increases the velocity of longitudinal wave (P-wave) but diminishes that of transverse wave (SV-wave). Also the numerical results presented indicate that initial stresses and dissipation might affect the reflection coefficients significantly. Keywords—Dissipation medium, initial stress, longitudinal waves, reflection coefficients, reflection of plane waves, transverse waves.","PeriodicalId":23764,"journal":{"name":"World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering","volume":"77 1","pages":"241-248"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91519165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

DQ Analysis of 3D Natural Convection in an Inclined Cavity Using an Velocity-Vorticity Formulation 斜腔内三维自然对流的速度涡量方程DQ分析

World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering Pub Date : 2009-11-01 DOI: 10.5772/7417

D. Lo, S. Leu

引用次数: 4

Parallel direct integration variable step block method for solving large system of higher order ordinary differential equations. 求解大型高阶常微分方程组的平行直接积分变阶块法。

World Academy of Science, Engineering and Technology, International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering Pub Date : 2009-10-01 DOI: 10.5772/8201

Z. Majid, M. Suleiman

引用次数: 7