Open Access Short Research Article

Influence of Living Conditions and Training for Health of Schoolchildren

S. V. Mihajlova, K. A. Vlasova, T. V. Sidorova, T. A. Poliakova, Y. G. Kuzmichev, E. A. Boltacheva, E. V. Lyubova

Current Journal of Applied Science and Technology, Page 1-6
DOI: 10.9734/BJAST/2016/27628

This research is devoted to the comparative analysis of Nizhny Novgorod region modern schoolchildren’s health state depending on living conditions and learning environment. Health assessment has been carried out according to the schoolchildren’s physical development indicators, obtained during the course of medical examinations in the Health Centre for children. The influence of the learning environment of studying has been studied in accordance with the Preventive-Oriented Health-Saving Activity Resource Center, organized on the basis of a secondary school. It has determined that the impact of territorial factors on the physical health of schoolchildren under the modern social and economic conditions begins to decline, and the value of health-saving technologies introduction into the educational process remains significant and relevant.

Open Access Minireview Article

Contribution of Catalase Positive Cocci on Flavour Formation in Fermented Sausages

Aybike Kamiloğlu, Güzin Kaban, Mükerrem Kaya

Current Journal of Applied Science and Technology, Page 1-8
DOI: 10.9734/BJAST/2016/27740

Flavour is an essential quality of food and formed by large number of volatile (alcohol, ketones, aldehydes, esters and terpenes etc.) and non-volatile compounds (amino acids and peptides etc.). In fermented sausage, flavour develops from biochemical reactions and is influenced by several variables such as formulation, process conditions and starter culture. Microorganisms involved in fermentation play an important role in the formation of aroma. Lactic acid bacteria and catalase-positive cocci are the most important starter cultures for fermented sausage. Lactic acid bacteria are mainly responsible for lactic acid production in sausage. Catalase-positive cocci have an impact on catalase activity, colour stability, prevention of rancidity and flavour formation. These microorganisms enhance flavour through proteolytic and lipolytic activity. This study reviews the functions of catalase-positive cocci and their effects on flavour in fermented sausages.

Open Access Original Research Article

Long Term Effect of Different Exercise Intensities on Serum Cortisol Level in Osteoarthritis Patients

Faten Mohammed Mohamed Elnozhe

Current Journal of Applied Science and Technology, Page 1-9
DOI: 10.9734/BJAST/2016/26574

Background: Exercise intensity has a significant impact on the levels of several hormones such as cortisol, adrenalin and testeseron.

Purpose: To compare between the effect of low intensity (40-60%) and high intensity (65-80%) aerobic exercises training on serum cortisol level, knee pain, stiffness and difficulty performing ADL activities in over weight osteoarthritic patients.

Methods: Forty overweight, knee osteoarthritic patients were selected between Jan and Mar 2016 from Elmenia University Hospitals, their ages ranged from 45-50 years. Patients were assigned randomly into two equal groups. Group A received aerobic exercises intensity 45% to 60% of maximum heart rate (MHR) and Group B received aerobic exercises intensity 65% to 75% of MHR. Both groups received aerobic exercises for 30 min / 3 sessions/week for 4 weeks. Serum Cortisol level and WOMAC questionnaire were assessed before the study and after 4 weeks of training.

Results: Serum Cortisol level after training in comparison to before training significantly decreased in Group A (P-value < 0.001) and significantly increased in Group B (P-value < 0.001). Also WOMAC questionnaire pain section, stiffness section and difficulty performing daily activities (ADL) section show statistically significant decrease after 4 weeks of training in both groups (P-value < 0.001). There was no significant difference in post training serum cortisol level, pain, stiffness or difficulty performing ADL activities between all groups (P-value > 0.05).

Conclusion: High intensity exercise (65-75%) significantly increased Serum Cortisol level while low intensity exercise (45-60%) significantly decreased Serum Cortisol level. Both high and low intensity aerobic exercises are effective in improving Knee OA symptoms.

Open Access Original Research Article

Characterizations of Beta-lead Oxide “Massicot” Nano-particles

Sarah A. Elawam, Wafaa M. Morsi, Hoda M. Abou-Shady, Osiris W. Guirguis

Current Journal of Applied Science and Technology, Page 1-10
DOI: 10.9734/BJAST/2016/28143

The present work objective is to prepare and study beta-lead oxide (β-PbO) “massicot” nano-powders by sol-gel method. The lead oxide nano-powders were synthesized through the reaction of lead diacetate solution and oxalate solution. The thermal stability and characterization of the compound were investigated by thermogravimetric (TGA) and differential scanning calorimetry (DSC) analyses, X-ray powder diffraction (XRD) and Fourier transform infrared (FT-IR) techniques. The morphology and crystallographic structural forms were performed by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). The obtained TGA and DSC data indicate that the prepared PbO nano-particles are stable. The XRD, HRTEM and SAED data indicate that a mixture of Pb, litharge (tetragonal PbO), and massicot (orthorhombic PbO) were formed with average crystalline size of about 84 nm. The SAED pattern revealed that the formed nano-particles are β-PbO which it was dominant because the annealing temperature was above 400°C.

Open Access Original Research Article

Wind Energy Density in Nigeria as Estimated From the ERA Interim Reanalysed Data Set

Ayodeji Oluleye, Debo Adeyewa

Current Journal of Applied Science and Technology, Page 1-17
DOI: 10.9734/BJAST/2016/13340

Inadequate power generation from hydro and fossil fuel electrical power stations in Nigeria demands seeking additional sources of power generation. This study focuses on wind source with the aim to determine suitable locations for commercial wind farms. Using reanalysed wind speeds data from European Reanalysis project (ERA interim), wind speeds at the turbine height of 70 m have been estimated for 39 stations over Nigeria. Because local surface features of each station have strong effect on wind speeds, profile of wind has been estimated by taking into account the surface albedo, cloud cover and atmospheric stability functions. By using the two - parameter Weibull function, this study has delineated area (stations) characterised by persistent wind flows adequate for commercial electrical power generation. Calculated usable electrical output from General Electric 1.5xle type turbine in the identified potential areas ranges between 2.5 and 11.3 MW in southern station of Lagos, whereas in the northern windy stations usable electrical power ranges between 4.79 and 11.04 MW.

Open Access Original Research Article

Visualization of Traffic Data Using View Fusion Techniques

Ren Li Jing, Zhao Zheng Xu

Current Journal of Applied Science and Technology, Page 1-6
DOI: 10.9734/BJAST/2016/27685

The traditional data visualization technology concentrates on the chart analysis and the summary of calculation analysis, and ignore the spatial distribution characteristics of statistical information. Currently, data visualization technology and its applications suffer from the issues such as low-accurate visualization, limited representation solutions and blurred inherent information. In order to overcome the shortages caused by these problems, we propose a mixed visual analysis scheme combined with geographic information data to better display spatial statistical data. The proposed system combines a variety of visualization techniques, such as geographic maps, bubble chart, and Treemap visualization method to enhance the visual results and ensure that users can observe various data indicators from different angles. In order to further analyze the data of interest, we design and achieve a variety of visualization techniques coordinated with multiple views. The experimental results show that the proposed fusion visualization techniques can help users to discover the regularity of statistical data more easily and offer a fast and convenient visualization tool for statistical data analysis.

Open Access Original Research Article

Design of Reactive Power and Voltage Controllers for Converter-interfaced ac Microgrids

Maruf A. Aminu

Current Journal of Applied Science and Technology, Page 1-14
DOI: 10.9734/BJAST/2016/25787

This paper aims at presenting design of two controllers for the study of a microgrid testbed. The response of the microgrid testbed to different short circuits would be investigated under these two control regimes, namely, reactive power and voltage controls. This paper therefore presents design of active power, reactive power and voltage regulators for a converter-interfaced ac microgrid. The design was performed using Simulink Control Design® in the Department of Electrical and Computer Engineering, Curtin University, Sarawak, Malaysia between May 2015 and December 2015.  The microgrid consists of two 5.5kW, 575V wind turbines based on doubly-fed induction generators (DFIGs). The systems designed are pitch control system, active power regulator, reactive power regulator, grid ac voltage regulator, dc bus voltage regulator, grid-side converter current regulator and rotor-side converter current regulator. The time-domain step response analysis for each modeled plant indicated stable performance but poor response. Therefore, regulators were realized in closed-loop feedback architecture. Each regulator was designed using small signal frequency response analysis, resulting in stable systems with satisfactory response. The regulators have been combined to implement two mutually exclusive control regimes: the active power-voltage (PV) control and the active-reactive power (PQ) control. Microgrid short circuit studies have been performed while the effect of control is decoupled, a highly simplified method which does not sufficiently mimic real systems. While attempting to study the microgrid short circuit response under different control regimes in a project which is still ongoing, this paper presents an attempt to design two control regimes for the ac microgrid testbed.

Open Access Original Research Article

Economic Evaluation of Gas Power Plant Project for the First Gas Industrial Park in Nigeria

Olugbenga Adebanjo Falode, Ayodeji Olaoluwa Ladeinde

Current Journal of Applied Science and Technology, Page 1-19
DOI: 10.9734/BJAST/2016/27199

In this paper, discounted cash flow analysis and Monte Carlo simulation were used to evaluate the Gas Power Plant Project for the first Gas Industrial Park in Nigeria. These methods gave maximum insight into the basis for investment decision and show the profitability of gas fired generation. A Net Present Value of $10.8 million at a discount rate of 15% and an Internal Rate of Return (IRR) of 16% with a payback period of 9 years was realized. Probabilistic result gave a 62.8% certainty of having a positive NPV and IRR values above the hurdle rate for investment. The capacity factor, capital cost and debt capital were uncertain parameters that will have huge effect on the power project. The study concludes that the gas fired power plant project in the industrial park is economically viable.

Open Access Original Research Article

Optimization of Drinking Water Treatment Process by Modeling the Aluminum Sulfate Dose

Mohamed Farhaoui, Lahcen Hasnaoui, Mustapha Derraz

Current Journal of Applied Science and Technology, Page 1-14
DOI: 10.9734/BJAST/2016/26840

The coagulant optimal dose determination is an issue of particular concern in water treatment processes. Coagulant dosing is correlated to raw water quality related to some parameters (Turbidity, pH, Temperature and Conductivity). The aim of this study is to provide water treatment operators with a tool that enables to predict and sometimes replace the manual method (jar testing). The model is developed on the basis of current process data recorded in water treatment plant located in the middle of Morocco (Meknes). This non linear model is related to turbidity, pH and temperature parameters. Comparison between aluminum doses measured and the alum doses calculated by the elaborated model shows a very interesting result. In fact, modeling can reduce aluminum sulfate consumption by more than 10%. Thus, the model can be applied in determining aluminum doses in the water treatment plant and can be extended to others.

Open Access Original Research Article

Relationships among Structural Adaptations, Strategy Implementation and Performance of Manufacturing Small and Medium Firms in Thika, Kenya

Peter Kihara, Henry Bwisa, John Kihoro

Current Journal of Applied Science and Technology, Page 1-16
DOI: 10.9734/BJAST/2016/28025

This paper examined the relationship between structural adaptations during strategy implementation and performance of small and medium manufacturing firms (SME) in Thika Sub-County in Kenya. Three structural dimensions investigated in this study included the formalization, centralization and specialization of functions. The study is underpinned in McKinsey’s 7-S/Higgins 8-S strategy frameworks and the Dynamic Capabilities View of the firm. Guided by the philosophy of logical positivism, a mixed research design was adopted. A self-administered questionnaire was used to collect primary data from 115 SME manufacturing firms using a simple random sampling procedure from a total population of 165 SME manufacturing firms. Pearson’s correlation and OLS regression analysis was used for data analysis. The study found statistical evidence that structural adaptations of the SME firm (r=.442**, P<.001) are positively and significantly related to its performance. Among the structural dimensions examined, the study found that formalization (r=.456**, P<.001) and specialization (r=.350**, P<.001) are positively and significantly related to SME’s performance. However, centralization (r=.159, P=.09) was found to be positively related to the SME’s performance but the relationship is statistically insignificant.