September 2011
Thermal stabilizers for poly(vinyl chloride): A review
Poly(vinyl chloride) (PVC) is one of the most important commercial plastic materials, but it is thermally unstable at processing temperature. Processing of PVC at elevated temperatures requires the use of thermal stabilizers. Widely used thermal stabilizers for PVC incorporate toxic heavy metal and organo-tin compounds that have been severely criticized based on environmental concern. In order to address this issue,...
September 2011
Investigation on synthesis and size control of copper nanoparticle via electrochemical and chemical reduction method
Copper nanoparticles were synthesized and the effect of the operating conditions via both chemical and electrochemical synthesis methods was investigated in this paper. In the chemical reduction method, copper nanoparticles were prepared in a copper sulfate solution using NaBH4 as reducing agent and then stabilized in the presence of polyvinylpyrrolidone under nitrogen atmosphere. Temperature and...
September 2011
A model about our Galaxy
We assumed the energy flow of the nuclear related with Dirac field, and compared it with Dirac equation. We found that energy flow equation has the same form with Dirac equation. There have been results taken from different item, which has the same mass of the energy that changed trend as the clock changed. We calculated the relationship of mass and radius of planet in solar system with the equations just to compare...
September 2011
The spatial and volumetric variations of radon in Bangalore Metropolitan, India
Radon levels have been measured in houses at ten different locations of Bangalore City, India. The study was focused on the basis of quality of construction, age of building and room volume. Solid state nuclear track detectors were used for measuring the concentrations. The average spatial values of 222Rn and 220Rn concentrations were found to be 33.4 ± 6.1 and 21.6 ± 2.5 Bqm-3, respectively....
September 2011
Detection of fault location in the transmission lines with voltage sampling and CT deletion by network impedance matrix method
There are a lot of methods for fault location using synchronized phasor measurement. Most of these methods are based on using measured voltage and current in one or two ends of a transmission line. Current measurement accuracy is limited according to the used current transformer’s (CT) accuracy. In this paper, besides various methods of fault distance location detection in power transmission lines, a new method...
September 2011
Electrical, structural and optical properties of ZnO thin films grown by pulsed laser deposition
We report the influence of oxygen partial pressure (PO2) on the electrical, structural and optical properties of no-stoichiometric ZnO (ZnO1-d) thin films grown by Nd:YAG pulsed laser deposition. We note that the electrical resistance of the ZnO1-d thin films is significantly modified by oxygen pressure; the electrical resistance decreases with the O2pressure in the range of 10 to 40...
September 2011
Modeling and simulation of maglev train-guideway-tunnel-soil system for vibration
A maglev train-guideway-tunnel-soil coupling system model is developed to study the wave propagation problem caused by high speed electromagnetic suspension (EMS) maglev train travelling through tunnel. The maglev train is simulated by multi-bodies, which takes the rigid body characteristics of the body-bogie-magnet system into account. The guideway-tunnel-soil system is simulated by 3D finite elements, and the...
September 2011
Bayesian networks for defining relationships among climate factors
Factors that shape the weather are studied to design models to make predictions. Understanding the relationships among these factors contribute to a better knowledge of atmospheric phenomena. However, conventional statistical techniques do not take into account the dependent relationships among these factors. Bayesian learning models are used in learning processes, which consist in quantification of conditional...
September 2011
3D numerical definition with vectors for human smiles
In most of the numerical methods for facial expressions in the literatures, the number of the key controls for animators or robot programmers are too complex and trivial, because what they want are less and critical controls. This study explored varied types of human smiles and extracted proper key factors affecting the smiles. These key factors then were converted into a set of control points which could serve to...
September 2011
Groundwater quality assessment of Labuan Island
Groundwater is known as an important source of water supply due to its relatively low susceptibility to pollution in comparison to surface water, and its large storage capacity (USEPA, 1985). It should be mentioned that water pollution is any physical, chemical or biological change in the quality of water that has a harmful effect on any living thing that drinks, uses or lives in it. When humans drink polluted water, it...
September 2011
Modelling morbidity related absenteeism among workers in University of Ibadan Community, Nigeria: Poisson regression
Globally, sickness absenteeism is a contemporary public health problem, particularly in developing countries. However, very few studies had addressed the theoretical and methodological aspects of health related absenteeism among University workers. A retrospective study of sickness records of 4447 employees of University of Ibadan made available at the University Staff Clinic (Jaja). The health records of each staff for...
September 2011
Semantic discovery of web services using principal component analysis
With the increase in the number of available web services, searching for appropriate web services fulfilling the service discoverer’s functional requirements has become as major challenge. Web services standards, in their present format support only keyword based search and many services which can fulfill the user’s requirements are not retrieved. Basic requirement for efficient service discovery is to...
September 2011
Speech control of a teleoperated mobile humanoid robot
This paper presents a mobile humanoid robot platform which is able to understand humans' speech commands in teleoperation environments. For service in unstructured environments, the robot must operate efficiently under active auditory perception system to ensure a coordinated human-robot system. First, the speech-based teleoperation control is introduced, with the cameras mounting on the robots, transmitting the...
September 2011
Some new classes of analytic functions defined using convolution
In this paper, we introduce and study some new subclasses of analytic functions defined in the open unit disc using the convolution technique. Inclusion results, radius problems and several other properties of these classes are discussed. Key words: Convolution integral operator, functions with positive real part, alpha-starlike, bounded Mocanu variation, univalent.
September 2011
Behavior and performance of a photovoltaic generator in real time
Solar photovoltaic is of great importance for developing countries like Mauritania and Senegal, without which many villages in these countries would still be facing lack of electricity services for many years to come. The use of solar energy can contribute to the improvement of the living conditions of these populations. This work presents the development of a simulation model for predicting the performance of a solar...
September 2011
A metamaterials inspired miniaturized phi-shaped antenna
This paper introduces a new low cost, robust miniaturized microstrip antenna inspired with metamaterial split ring resonator structure (SRR). Because of metamaterials property there has been considerable reduction in size. The overall antenna structure is phi shaped which is equivalent to two SRRs placed back to back. This phi shaped antenna (PSA) thus obtained has been simulated on EM solver Ansoft HFSS and scattering...
September 2011
Design of new square-lattice photonic crystal fibers for optical communication applications
In this paper, two new square-lattice photonic crystal fibers (PCFs) are designed and proposed. Both fibers have identical structures with five air-hole rings, yet the diameter of air-holes differ in their structures. Finite-difference time-domain (FDTD) method with the perfectly matched layers (PML) boundary conditions has been used to investigate these fibers. The proposed photonic crystal fibers exhibit properties of...
September 2011
Signature verification using rules 3-ext inductive learning system
This paper presents an alternative technique for “signature verification”. The technique employs template matching for feature extraction and Rules 3-ext inductive learning algorithm to extract the necessary set of rules and to verify a signature. 15 of 3 × 3 masks were used to represent a signature. Each signature (or pattern) is presented by the frequencies of the masks used. The system was trained...
September 2011
Influence of tensile force of agave and tea plants roots on experimental prototype slopes
The study is aimed to determine the influence of tensile force of roots of agave (Angustifolio marginata) and tea (Acalypha siamensis) plants on landslide in prototype slopes. The plants of agave and tea were planted in different prototype slopes and the corresponding tensile forces were measured with the installed strain gauge in-situ. The study found that the tensile force of tea plants increase with...
September 2011
A constrained equalization scheme for mobile location in non-line-of-sight environments
Mobile location techniques in wireless communication networks have received significant attention in recent years. One of the main problems impeding accurate location estimation is non-line-of-sight (NLOS) propagation. In this paper, we propose a novel method by incorporating constrained optimization algorithm with an equalization scheme, where the weights are derived from root mean square delay spread, which is an...
September 2011
Analysis of transient heating due to exothermic reaction in a stockpile of combustible material
In this paper, the transient heating in a stockpile of combustible material due to an exothermic reaction in the presence of convective heat loss to the ambient is analyzed. The transient heating in a slab due to an exothermic chemical reaction with the possibility of heat loss to the ambient is considered. The chemistry involved in the problem is simplified by assuming a one-step finite-rate irreversible Arrhenius...
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