Volume 10, Issue 5 (2013) | American Journal of Applied Sciences

Conceptual Understanding in Secondary School Chemistry: A Discussion of the Difficulties Experienced by Students

Kamisah Osman — 2013-05-17

American Journal of Applied Sciences, Published online: 17 May 2013; doi:10.3844/ajassp.2013.433.441

It has been widely discussed that students’ conceptual alternatives in science play a vital role in shaping their scientific understanding acquired through formal science learning. As one of the com...

Health Risk Assessment of Nitrate Exposure in Well Water of Residents in Intensive Agriculture Area

Noraziah Jamaludin — 2013-05-21

American Journal of Applied Sciences, Published online: 21 May 2013; doi:10.3844/ajassp.2013.442.448

Nitrate in well water has become a public health concern especially in agriculture areas. Nitrate contamination in drinking water poses health risks to humans. This cross-sectional study was conducted...

Transmission Model of Chikungunya Fever in the Presence of Two Species of Aedes Mosquitoes

Surapol Naowarat — 2013-05-27

American Journal of Applied Sciences, Published online: 27 May 2013; doi:10.3844/ajassp.2013.449.459

In 2008 there was a large outbreak of Chikungunya fever in the south of Thailand. Chikungunya fever is a febrile disease transmitted to humans by the bite of infected Aedes mosquitoes. The symptoms of...

Numerical Study of the Eulerian Correlations and Lagrangian Velocity in Stably Stratified Homogeneous Turbulence

Abdallah Jaouabi — 2013-05-28

American Journal of Applied Sciences, Published online: 28 May 2013; doi:10.3844/ajassp.2013.460.465

This study is based on a linear analysis in spectral space. To express the correlation double speed using Lagrangian Dual Eulerian correlations, we use the Corrsin assumption and then we compute the c...

Hardware Modeling of Binary Coded Decimal Adder in Field Programmable Gate Array

Muhammad Ibn Ibrahimy — 2013-05-28

American Journal of Applied Sciences, Published online: 28 May 2013; doi:10.3844/ajassp.2013.466.477

There are insignificant relevant research works available which are involved with the Field Programmable Gate Array (FPGA) based hardware implementation of Binary Coded Decimal (BCD) adder. This is be...

Influence of Extraction Conditions on the Recovery of Phenolic Antioxidants from Spent Coffee Grounds

Antonio Zuorro — 2013-05-28

American Journal of Applied Sciences, Published online: 28 May 2013; doi:10.3844/ajassp.2013.478.486

The extraction of phenolic compounds from Spent Coffee Grounds (SCG), a waste produced in large amounts worldwide, was investigated. SCG were rich in fiber and protein and had a total phenolic content...

BER Performance and Data Throughput of Sinusoidal Template-Based Impulse-Radio Ultra Wideband Receivers for Wireless Body Area Networks

Mohamad Abou El-Nasr — 2013-05-30

American Journal of Applied Sciences, Published online: 30 May 2013; doi:10.3844/ajassp.2013.487.496

Windowed sinusoidal template-based correlator receivers are good candidates for high-data rate low-power Ultra Wideband (UWB) systems. Their performance approaches the performance of optimal detectors...

Static and Dynamic Location of Variable Impedance Devices for Stability Studies

N. Magaji — 2013-05-31

American Journal of Applied Sciences, Published online: 31 May 2013; doi:10.3844/ajassp.2013.497.506

This study used the concept of model controllability and observability in product form called residue factor to find the best location of Thyristor-Controlled based series and shunt devices called var...

Assessment of Ecotourism Travel Risk on Word-of-Mouth: Via Fuzzy Set Perspective

Fangyi Liu — 2013-05-31

American Journal of Applied Sciences, Published online: 31 May 2013; doi:10.3844/ajassp.2013.507.514

Because of the subjective cognition on Word-Of Mouth (WOM) influence and the fuzziness on perceived-risk judgment, perceived risk in WOM Influence is a venture variable, which cannot be measured direc...

Twist Springback Measurement of Autonomous Underwater Vehicle Propeller Blade Based on Profile Deviation

Ahmad Baharuddin Abdullah — 2013-05-31

American Journal of Applied Sciences, Published online: 31 May 2013; doi:10.3844/ajassp.2013.515.524

Geometrical defects that are attributable to springback are among the major defects induced by the sheet metal forming process. Such defects are critical for sections with varying thickness, such as A...

Dyeability and Mechanical Properties of Acrylonitrile-Diallylamine Salts Copolymers

Abir S. Abdel-Naby — 2013-05-31

American Journal of Applied Sciences, Published online: 31 May 2013; doi:10.3844/ajassp.2013.525.535

The dyeability of Acrylonitrile-Diallylamine Acetate (AN-DAA acetate) and Acrylonitrile-Diallylguanidine Acetate (AN-DAGA) copolymers have been studied with both conventional and ultrasonic methods. T...