Volume 4, Issue 4 (2011) | American Journal of Engineering and Applied Sciences

Effect of Pressure, Water Depth and Water Flow Rate on Oxygen Saturation Level in Activated Sludge Process

Nabil N. Atta — 2011-12-21

American Journal of Engineering and Applied Sciences, Published online: 21 December 2011; doi:10.3844/ajeassp.2011.435.439

Problem statement: The role of aeration in activated sludge process is to provide oxygen to microorganisms as they assimilate the organic carbon compounds and digest a portion of them to carbon dioxid...

Detection of Subsurface Defects in Concrete Bridge Deck Joints

Wonchang Choi — 2011-12-31

American Journal of Engineering and Applied Sciences, Published online: 31 December 2011; doi:10.3844/ajeassp.2011.440.447

Problem statement: The integrity of deck joints in highway bridges plays a major role to determine overall performance of bridge system. As the bridge maintenance program, the defects in deck joints h...

Single Step Optimal Block Matched Motion Estimation with Motion Vectors Having Arbitrary Pixel Precisions

Charlotte Yuk-Fan Ho — 2012-01-12

American Journal of Engineering and Applied Sciences, Published online: 12 January 2012; doi:10.3844/ajeassp.2011.448.460

Problem statement: This study derives the optimal motion vector with arbitrary pixel precisions in a single step. Approach: A non-linear block matched motion model was proposed. Based on the proposed ...

New Mersenne Number Transform Diffusion Power Analysis

M. F. Al-Gailani — 2012-01-12

American Journal of Engineering and Applied Sciences, Published online: 12 January 2012; doi:10.3844/ajeassp.2011.461.469

Problem statement: Due to significant developments in the processing power and parallel processing technologies, the existing encryption algorithms are increasingly susceptible to attacks, such as sid...

A Wireless Sensor Node Supporting Various Powers Supply and Communication Methods

Stefan Gruber — 2012-01-12

American Journal of Engineering and Applied Sciences, Published online: 12 January 2012; doi:10.3844/ajeassp.2011.470.476

Problem statement: This study presents a wireless sensor node dedicated for in-tire pressure and temperature monitoring. Additional features set it apart from the many different systems available on t...

Low Cycle Fatigue Behavior of a Reduced End Plate Moment Connection (T-Stub)

Chemin Lim — 2012-01-12

American Journal of Engineering and Applied Sciences, Published online: 12 January 2012; doi:10.3844/ajeassp.2011.477.484

Problem statement: In this research, four reduced End Plate Moment Connection (EPMC) specimens (T-stubs) are tested to verify the numerical and theoretical methods for preanalysis of the Low Cycle Fat...

Metro Access Convergence for Broadband Future Low Energy Consumption Networks

G.M. Tosi Beleffi — 2012-01-12

American Journal of Engineering and Applied Sciences, Published online: 12 January 2012; doi:10.3844/ajeassp.2011.485.490

Problem statement: In study the impact of the optical technologies and infrastructures on the reduction of the carbon footprint maintaining high level of broadband to the end user is discussed. Approa...

Optimal Decentralized Spectral Resource Allocation for Orthogonal Frequency Division Multiple Access Downlink of Femto Networks Via Adaptive Gradient Vector Step Size Approach

Lamia Benmesbah — 2012-01-14

American Journal of Engineering and Applied Sciences, Published online: 14 January 2012; doi:10.3844/ajeassp.2011.491.496

Problem statement: For the Orthogonal Frequency Division Multiple Access (OFDMA) downlink of a femto network, the resource allocation scheme would aim to maximize the Area Spectral Efficiency (ASE) su...

Evaluation and Beneficiation of Bentonitic Clays from Pindiga Formation in Benue Trough

B. B.M. Dewu — 2012-01-16

American Journal of Engineering and Applied Sciences, Published online: 16 January 2012; doi:10.3844/ajeassp.2011.497.503

Problem statement: This study aimed at evaluating and beneficiating Bentonitic clays of Pindiga Formation from the upper Benue trough in northeastern Nigeria to meet the standard required for use in o...

Image Compression Algorithms Using Intensity Based Adaptive Quantization Coding

Saad Al-Azawi — 2012-01-18

American Journal of Engineering and Applied Sciences, Published online: 18 January 2012; doi:10.3844/ajeassp.2011.504.512

Problem statement: Low complexity image compression algorithms are necessary for modern portable devices such as mobile phones, wireless sensor networks and high constraint power consumption devices. ...

The Performance of a Dual Header Pulse Interval Modulation in the Presence of Artificial Light Interferences in an Indoor Optical Wireless Communications Channel with Wavelet Denoising

S. Rajbhandari — 2012-01-18

American Journal of Engineering and Applied Sciences, Published online: 18 January 2012; doi:10.3844/ajeassp.2011.513.519

Problem statement: Similar to other baseband modulation schemes, the performance of the Dual Header Pulse Interval Modulation (DH-PIM) is adversely affected by Artificial Light Interferences (ALI) in ...

Coherent Polarization Shift Keying Modulated Free Space Optical Links Over a Gamma-Gamma Turbulence Channel

X. Tang — 2012-01-18

American Journal of Engineering and Applied Sciences, Published online: 18 January 2012; doi:10.3844/ajeassp.2011.520.530

Problem statement: The optical signal propagating through the Free Space Optical (FSO) channel suffers from irradiance and phase fluctuations caused by the atmospheric turbulence, which results in Bit...

Energy Consumption and Environmental Implications of Wired Access Networks

Slavisa Aleksic — 2012-01-18

American Journal of Engineering and Applied Sciences, Published online: 18 January 2012; doi:10.3844/ajeassp.2011.531.539

Problem statement: Wired broadband Internet access can be realized using various technologies, configurations and protocols. It is widely deployed and able to provide both high data rates and high rel...

Improvement of the Runner Design of Francis Turbine using Computational Fluid Dynamics

Suthep Kaewnai — 2012-01-25

American Journal of Engineering and Applied Sciences, Published online: 25 January 2012; doi:10.3844/ajeassp.2011.540.547

Problem statement: The objective of this study is to improve runner design of the Francis turbine and analyze its performance with the Computational Fluid Dynamics (CFD) technique. Approach: A runner ...

Wind Load Effects on Manufactured Home Foundations

Ramesh K. Dhungana — 2012-01-25

American Journal of Engineering and Applied Sciences, Published online: 25 January 2012; doi:10.3844/ajeassp.2011.548.555

Problem statement: Manufactured homes are susceptible to hurricane damage. Each year, significant losses, in terms of fatalities and property damage, are reported. There is always a prevalent concern ...

Adaptive Channel Estimation for Multiuser Underwater Communication Systems

S. Aliesawi — 2012-02-20

American Journal of Engineering and Applied Sciences, Published online: 20 February 2012; doi:10.3844/ajeassp.2011.556.565

Problem statement: Multiple Access Interference (MAI) signals and poor estimation of the unknown channel parameters in the presence of limited training sequences are two of the major problems that deg...

FPGA-Based Architecture for a Generalized Parallel 2-D MRI Filtering Algorithm

Sami Hasan — 2012-02-20

American Journal of Engineering and Applied Sciences, Published online: 20 February 2012; doi:10.3844/ajeassp.2011.566.575

Problem statement: Current Neuroimaging developments, in biological research and diagnostics, demand an edge-defined and noise-free MRI scans. Thus, this study presents a generalized parallel 2-D MRI ...

Cross Validation Evaluation for Breast Cancer Prediction Using Multilayer Perceptron Neural Networks

Shirin A. Mojarad — 2012-02-20

American Journal of Engineering and Applied Sciences, Published online: 20 February 2012; doi:10.3844/ajeassp.2011.576.585

Problem statement: The presence of metastasis in the regional lymph nodes is the most important factor in predicting prognosis in breast cancer. Many biomarkers have been identified that appear to rel...

An Evaluation of Thermal Imaging Based Respiration Rate Monitoring in Children

Farah AL-Khalidi — 2012-07-31

American Journal of Engineering and Applied Sciences, Published online: 31 July 2012; doi:10.3844/ajeassp.2011.586.597

Problem statement: An important indicator of an individual’s health is respiration rate. It is the average number of times air is inhaled and exhaled per minute. Existing respiration monitoring meth...

Inverse Discrete Fourier Transform-Discrete Fourier Transform Techniques for Generating and Receiving Spectrally Efficient Frequency Division Multiplexing Signals

Sahmed Idarwazeh — 2012-07-31

American Journal of Engineering and Applied Sciences, Published online: 31 July 2012; doi:10.3844/ajeassp.2011.598.606

Problem statement: Spectrally Efficient Frequency Division Multiplexing (SEFDM) system promises bandwidth savings by multiplexing overlapped non-orthogonal sub-carriers. However, the loss of orthogona...

Distributed Amplify and Forward Cooperation While Maintaining Transmission Freedom

L. Chen — 2012-08-02

American Journal of Engineering and Applied Sciences, Published online: 2 August 2012; doi:10.3844/ajeassp.2011.607.616

Problem statement: This study proposes a novel Distributed Amplify and-Forward (DAF) cooperative scheme, achieving higher diversity order and yet maintaining the same transmission freedom as the conve...