Volume 5, Issue 8 (2008) | American Journal of Applied Sciences

Narrow-band ultraviolet B and Conventional UVB phototherapy in Psoriasis: a Randomised Controlled Trial

Yan Yuehua — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.905.908

The narrow-band (NB-UVB) was developed for use in phototherapy, as an alternative to a broad-band UVB source and to photochemotherapy, both of which have significant side effects and carry a risk of c...

Three-Phase Shunt Active Power Filter

Moleykutty George — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.909.916

Active power filters have been widely used for harmonic elimination. The performance of a conventional three-phase shunt Active Power Filter (APF) using Synchronous Detection Method (SDM) has been com...

Experimental Study of Near Wake Flow Behind a Rectangular Cylinder

Abdollah Shadaram — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.917.926

The turbulence characteristics of the near wake flow behind a rectangular cylinder is investigated in a two-dimensional analysis using a hot-wire anemometer. The time-averaged and fluctuating compon...

Simulation of Convective Heat-Transfer Coefficient in a Buried Exchanger

Taoufik Mnasri — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.927.933

This study presents analytical models allowing to study a forced convection laminar flow in non-established dynamic and thermic regimes. We treated a flow in a bitubular exchanger in permanent thermal...

Dead Sea Rate of Evaporation

Abdelaziz L. AL-Khlaifat — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.934.942

The Dead Sea is exceptional by many standards. It is the saltiest and lowest lake in the world. Moreover it is a closed lake with very large variations in its water level caused by both ma...

Heuristic Algorithm in Optimal Discrete Structural Designs

Alongkorn Lamom — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.943.951

This study proposes a Heuristic Algorithm for Material Size Selection (HAMSS). It is developed to handle discrete structural optimization problems. The proposed algorithm (HAMSS), Simulated Annealing ...

An Aggregation Approach for Group Multicriteria Assignment

George Rigopoulos — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.952.958

We presented an aggregation approach for group multicriteria assignment decisions, where group members express their preferences on problem parameters in numeric format. Individual preferences are agg...

Continuous Production of Lime Juice by Vacuum Freeze Drying

Wasan Theansuwan — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.959.962

An experimental dryer was developed to determine the characteristics of lime juice powder that produced from freeze-drying processes on continuous production. The experimental process consists of two ...

An Investigation of Valve Lift Effect on Air Flow and Coefficient of Discharge of Four Stroke Engines Based on Experiment

Abdul Rahim Ismail — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.963.971

The coefficient of discharge (CD) is defined as the ratio of actual discharge to ideal discharge. In an engine environment, ideal discharge considers an ideal gas and the process to be free from frict...

Analytical and Numerical Analysis of Free Bulge Tube Hydroforming

F. Djavanroodi — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.972.979

Free bulge hydroforming simulation was analysied to investigate the biaxial behavior of extruded aluminum tubes. A finite element model was constructed to simulate the hydroforming process and asses t...

Design of Robust UPFC Controller Using H_∞ Control Theory in Electric Power System

Seyed Abbas Taher — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.980.989

An industrial plant, such a power system, always contains parametric uncertainties. In the design of a controller the uncertainties have to be considered. Otherwise, if the real plant differs from the...

Selected Malaysian Wood CO₂ -Laser Cutting Parameters And Cut Quality

Nukman Yusoff — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.990.996

Laser has been used to cut most non-metallic materials very efficiently and successfully because these materials are highly absorptive by the CO2 laser wavelength of 10.6 10.6µm. Laser cutting proces...

Estimation of C*-Integral for Radial Cracks in Annular Discs under Constant Angular Velocity and Internal Pressure

A.R. Gowhari-Anaraki — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.997.1004

The finite element method has been used to predict the creep rupture parameter, C*-Integral for single and double-edge cracks in eight annular rotating discs under constant angular velocity with and w...

Determination of Ibuprofen and Paracetamol in Binary Mixture Using Chemometric-Assisted Spectrophotometric Methods

Wafaa S. Hassan — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1005.1012

Three methods are presented for simultaneous determination of ibuprofen and paracetamol without previous separation. The first method depends on first derivative UV spectrophotometry, with zero-crossi...

Analysis of the Parameters Affecting Warping In Radial Forging Process

F. Djavanroodi — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1013.1018

Radial forging is a process in which one or two punches move axially causing a radial flow into a die cavity by means of which a flange is formed. During forging, warping, in which the lower face of t...

Solving Volterra's Population Model Using New Second Derivative Multistep Methods

K. Parand — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1019.1022

In this study new second derivative multistep methods (denoted SDMM) are used to solve Volterra's model for population growth of a species within a closed system. This model is a nonlinear integro-dif...

Two Mathematical Modeling Approaches for Integrating Production and Transportation Decisions in the Process Industry

Mohamed K. Omar — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1023.1028

In this study we focus on coordination of the production planning of finished products and intermediate products in the process industry. The problem consists of two manufacturing facilities with simi...

Power Quality Improvement Using a Sliding Mode Control of a Series Active Filter

Theerayuth Chatchanayuenyong — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1029.1033

A sliding mode controller (SMC) for a three-phase series active filter was proposed to compensate voltage unbalances, suppress voltage sags and swells and hence improve the power quality of a three-ph...

General Properties of 3/2ω₀ and 2ω₀ Harmonics Emission from Laser Driven Plasmas

A.S.A. Dib — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1034.1040

Using a simple model based on the conversion of electron plasma waves into electromagnetic waves through a process of parametric interaction of four waves, the general properties of theÂ 3/2ω0 emi...

Fracture and springback on Double Bulge Tube Hydro-Forming

F. Djavanroodi — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1041.1046

This research aims to establish a basic understanding of Double Bulge Tube Hydro-Form processing of stainless steel deep drawn cups. The method is briefly reviewed by carrying out experimental tests a...

Effect of Storage Time and Temperature on Serum Analytes

Abdoljalal Marjani — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1047.1051

Information on the measured concentration of serum analytes during storage of serum samples is often incomplete and sometimes contradictory. The 10 analytes have not studied in this area in healthy su...

Abdominal and Thoracic Aortic Aneurysm Modeling

Mona Abdolrazaghi — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1052.1058

Modeling is a beneficial tool for understanding cardiovascular system functioning and pathophysiology of the system. The present study is concerned with left ventricle Pressure-Volume diagrams obtaine...

Impact of Four Wave Mixing (FWM) in Routing and Wavelength Assignment

Tan Saw Chin — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1059.1063

The impact of Four-Wave-Mixing (FWM) is investigated using the proposed Assign Shortest Path First (ASPF) algorithm for wavelength assignment in Routing and Wavelength Assignment (RWA). Results show t...

Modeling and Control of Three-Phase Shunt Active Power Filter

Moleykutty George — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1064.1070

In this research the performance of a three-phase shunt active power filter (APF) using Model Reference Controller (MRC) has been compared with that using instantaneous active and reactive (p-q) theor...

Optimal Dark Current Reduction in Quantum Well 9 µm GaAs/AlGaAs Infrared Photodetectors with Improved Detectivity

Shahram Mohammad Nejad — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1071.1078

In this research, an optimization approach is presented to decrease the dark current in GaAs/AlGaAs QWIPs. The dark current noise is reduced by increasing Al density in barriers, decreasing detector d...

Novel Approach to Determine the Effects of MS Environment using the Portable GPS Receiver with Built-in Antenna

Wan Azlan Wan Zainal Abidin — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1079.1082

Communication impairment on the Mobile Satellite (MS) path for non-geostationary satellite is mainly due to effect of multipath and shadowing. In order to study the signal quality received by the MS u...

Simulink Model of Direct Torque Control of Induction Machine

H.F. Abdul Wahab — 2008-08-31

American Journal of Applied Sciences, Published online: 31 August 2008; doi:10.3844/ajassp.2008.1083.1090

Direct torque control (DTC) is one of the most excellent control strategies of torque control in induction machine. It is considered as an alternative to the field oriented control (FOC) or vector con...

Volume 5, Issue 8 (2008) | American Journal of Applied Sciences

Narrow-band ultraviolet B and Conventional UVB phototherapy in Psoriasis: a Randomised Controlled Trial

Three-Phase Shunt Active Power Filter

Experimental Study of Near Wake Flow Behind a Rectangular Cylinder

Simulation of Convective Heat-Transfer Coefficient in a Buried Exchanger

Dead Sea Rate of Evaporation

Heuristic Algorithm in Optimal Discrete Structural Designs

An Aggregation Approach for Group Multicriteria Assignment

Continuous Production of Lime Juice by Vacuum Freeze Drying

An Investigation of Valve Lift Effect on Air Flow and Coefficient of Discharge of Four Stroke Engines Based on Experiment

Analytical and Numerical Analysis of Free Bulge Tube Hydroforming

Design of Robust UPFC Controller Using H∞ Control Theory in Electric Power System

Selected Malaysian Wood CO2 -Laser Cutting Parameters And Cut Quality

Estimation of C*-Integral for Radial Cracks in Annular Discs under Constant Angular Velocity and Internal Pressure

Determination of Ibuprofen and Paracetamol in Binary Mixture Using Chemometric-Assisted Spectrophotometric Methods

Analysis of the Parameters Affecting Warping In Radial Forging Process

Solving Volterra's Population Model Using New Second Derivative Multistep Methods

Two Mathematical Modeling Approaches for Integrating Production and Transportation Decisions in the Process Industry

Power Quality Improvement Using a Sliding Mode Control of a Series Active Filter

General Properties of 3/2ω0 and 2ω0 Harmonics Emission from Laser Driven Plasmas

Fracture and springback on Double Bulge Tube Hydro-Forming

Effect of Storage Time and Temperature on Serum Analytes

Abdominal and Thoracic Aortic Aneurysm Modeling

Impact of Four Wave Mixing (FWM) in Routing and Wavelength Assignment

Modeling and Control of Three-Phase Shunt Active Power Filter

Optimal Dark Current Reduction in Quantum Well 9 µm GaAs/AlGaAs Infrared Photodetectors with Improved Detectivity

Novel Approach to Determine the Effects of MS Environment using the Portable GPS Receiver with Built-in Antenna

Simulink Model of Direct Torque Control of Induction Machine

Design of Robust UPFC Controller Using H_∞ Control Theory in Electric Power System

Selected Malaysian Wood CO₂ -Laser Cutting Parameters And Cut Quality

General Properties of 3/2ω₀ and 2ω₀ Harmonics Emission from Laser Driven Plasmas