Open Access Case Reports / Case Studies

Chloroquine Resistance in a Case with Uncomplicated Plasmodium vivax Malaria: An Evolving Threat

Ganesh Kasinathan

Current Journal of Applied Science and Technology, Page 1-4
DOI: 10.9734/BJAST/2016/22553

Introduction: Chloroquine resistance is an emerging phenomenon in uncomplicated Plasmodium vivaxmalaria.

Presentation of Case: This case report describes a 21 year old forest worker who was diagnosed to have Plasmodium vivax malaria on blood film microscopy and it was confirmed on molecular real-time polymerase chain reaction analysis. He was treated with conventional oral chloroquine of optimal dosage in which he failed to respond appropriately. His blood film parasite count increased on day 3 of treatment despite adequate chloroquine therapy. He was then commenced on oral artemether-lumefantrine (Riamet) combination therapy in which he responded clinically and microscopically. He was discharged from the hospital after completing a 14-day course of oral primaquine. His serial blood films were negative for more than three consecutive days whilst in hospital. On subsequent weekly follow ups at the specialist clinic for a duration of 28 days, his blood films remained negative for malaria parasites.

Conclusion: Chloroquine resistance is now an emerging threat in many middle and low income countries globally.

Open Access Short Research Article

Modelling and Parameter Determination of an Induction Servo-Motor

J. A. Oyedepo, J. D. Jiya

Current Journal of Applied Science and Technology, Page 1-11
DOI: 10.9734/BJAST/2016/21969

This paper presents the modelling and parameter determination of an induction motor. The dynamic induction motor model was derived in relatively simple terms by using the concept of space vectors in d-q variables based on two-axis theory equations and the space phasor notation. A synchronous reference frame in which rotor flux lies on the d-axis was chosen with simplified dynamic equations and torque expressions. This research work presents these models with typical results and provides guidelines for their use for the dynamic simulation of small power induction motor based on mathematical modelling. An on-line dynamic simulation experiment was carried out to determine the induction motor parameters using MATLAB/Simulink program. The results obtained showed that the induction motor performs better under no-load. For satisfactory and better performance under load condition, controller will have to be introduced.

 

Open Access Original Research Article

System Model of a Technical Level of Rolling Bearings

Sergiy Gutyrya, Victor Yaglinskiy, Anatoly Gaydamaka

Current Journal of Applied Science and Technology, Page 1-8
DOI: 10.9734/BJAST/2016/20747

Purpose: To develop system hierarchical model of a technical level of rolling bearings, to prove efficiency of the modernization of standard designs providing increase of operational characteristics of axle boxes of railway transport.

Methodology: The hierarchy of structure and functional links between rolling bearing elements as mechanical system is established; quality indicators are offered; dependences for calculation of elements of a matrix of quality for the standard and modernized design are offered; results of solutions of system model are presented in the form of "a quality web"; efficiency of the proposed constructive solutions is confirmed.

Results: The directions of modernization of a design of roller cylindrical bearings as a part of axle boxes of railway transport providing increase of their dynamic loading capacity at 10,5%, the power efficiency at 59%, a resource at 19%, decrease at 11% of level of internal dynamic loadings, nominal temperature condition of operation at speeds of train movement up to 300 km/h are proved. As a result the indicator of a technical level of the upgraded bearings is raised at 47%.

Conclusion: Further development was gained by a system method of estimation and management of a technical level of machine-building production at stages design and modernization.

Open Access Original Research Article

The Influence of Partial UV-blocking Films in the Insect Infestation and in the Growth of Broccoli and Turnip Seedlings

Abul Hasnat Muhammad Solaiman, Takashi Nishizawa, S. M. Anamul Arefin, Md. Mizanur Rahman, Md. Dulal Sarkar, Mohammad Shahjahan

Current Journal of Applied Science and Technology, Page 1-11
DOI: 10.9734/BJAST/2016/22235

The present work study the effect of partially UV-blocking films on the promotion of growth and insect control as well as the herbivores/sucking insects-predators proportion in the tunnels of Broccoli and Turnip seedlings is provided. During the experiment six treatments were tested: outdoor, UV-transmitting, and partial UV-blocking (UVs shorter than 340, 350, 360 and 400 nm) in three replications. Also a tunnel covered with UV-transmitting polyolefin film was also prepared, and the results were compared with the seedlings that were grown, outdoors. The plant height, leaf number and leaf area increased in Turnip, while Broccoli was not affected. The number of insects invaded into the tunnels were trapped using blue and yellow adhesive films, and Eight different insects including mosquitoes were listed viz.: Aphid (Brevicoryne brassicae), brown plant hopper (Nilparvata lugens), short horn grass hopper (Melanoplus femurrubrum), white backed plant hopper (Sogatella furcifera), dipteran fly, mirid bug (Heteroptera: Miridae), up to 30 days after planting. Aphid was found as the most predominant insect followed by mosquito, dipteran fly, and white baked plant hopper. The largest feeding damage was found in outdoor with 26% in Broccoli and 22.5% in Turnip. The ratio of the herbivores and predators was also influenced by the films and it was remarkable in both Broccoli (35-65%) and Turnip (25-75%) seedlings, respectively. The partial UV-blockings effectively reduced the feeding damage compared with the outdoors, irrespective of seedling. Therefore, the sticky traps were found to be effective, and partial UV-blocking films showed different effects in controlling insect pests. Hence, the partial UV-blocking films can be an effective component for the IPM system rather than fully UV-blocking films.

Open Access Original Research Article

A Study of the Frequency Characteristics of Low-frequency Eddy Current Detection for a Vibrating Screen Beam with a Cladding Layer

Fu Sheng, Xu Xiao-Dong, Liu Yi, Xu Yong-Gang, Chen Tao

Current Journal of Applied Science and Technology, Page 1-14
DOI: 10.9734/BJAST/2016/21871

A low-frequency eddy current detection method to detect cracks in a vibrating screen beam equipped with a cladding layer is proposed in this paper. The simulation research shows that the optimal detection frequency is from 10 Hz to 100 Hz. The experimental study determined the relationship between the testing frequency for different sizes of cracks and the amplitude and phase beneath a 7-mm-thick cladding layer. Finally, the optimum detection frequency has been determined to be from 150 Hz to 200 Hz using phase identification and has been determined to be from 300 Hz to 400 Hz using the magnitude.

Open Access Original Research Article

Cloud Based Architecture Solution for Aircraft Flight Data Recorder

Bakare K. Ayeni, S. O. Yisah

Current Journal of Applied Science and Technology, Page 1-13
DOI: 10.9734/BJAST/2016/19896

Flight Data Recorder (FDR) is an on board equipment in the aircraft, it records many different operating conditions of the flight, computer animated video reconstruction of the flight can be generated from data retrieved from FDR, the aircraft accident investigators can then visualize the last moments of flight before the accident. There may be instances when it was difficult to retrieve FDR from the scene of an accident, or even, if retrieved, the data could not be retrieved because FDR might have been burnt beyond allowable temperature. As a result of this, there is a need for alternative source of data. The cloud computing concept could be extended to the aircraft system data network environment with every aircraft subscribing to the cloud resources to run their mission-critical applications. This paper models cloud based architecture solution for aircraft FDR by implementing private cloud computing. Unlike the existing Cloud Computing Platform of Aviation Industry (CCPAI) framework which provides a mechanism to monitoring aircraft management only, the proposed model in this paper will provide alternative data for aircraft accident investigators to work with in case of any aircraft mishap. Reliability of internet connection and availability of large bandwidth to support real time flight data transmission are envisaged as potential limitation of the proposed model.

 

Open Access Original Research Article

Reliability of Back-Contact MWT Modules under Hot and Humid Conditions

F. Bandou, A. Hadj Arab, M. S. Belkaid, V. Rosca, M. G. Guichoux, W. Eerenstein, J. A. M. van Roosmalen, P. O. Logerais

Current Journal of Applied Science and Technology, Page 1-10
DOI: 10.9734/BJAST/2016/22565

Aims: Back-contact metallization-wrap-through (MWT) modules made with different materials were manufactured and tested at ECN in The Netherlands.

Study Design: Damp heat testing (DH, 85°C and 85% relative humidity) was performed to investigate the effect of the module materials and potential failure mechanisms on electrical performance degradation.

Place and Duration of Study: ECN Solar Energy, P.O. Box 1, 1755 ZG Petten, Netherlands and Centre de Développement des Energies Renouvelables, Division Energie Solaire Photovoltaïque, Route de l'Observatoire, BP 62, Bouzaréah, 16340, Alger, Algeria, between June 2011 and March 2015.

Methodology: Fourteen back-contact MWT modules with different combinations of four conductive backsheet foils (inner isolation layers, also referred to as inner layer dielectric, ILD), two electrically conductive adhesives (CA) and two encapsulants were tested.

Results: Results reveal that modules which combine conductive backsheet foil with two types of ILD and ethylene-vinyl-acetate (EVA) showed the highest degradation levels. It is suggested that effects of moisture in EVA cause a weakening of the adhesion strength at the ILD/Cu interface and then delamination between conductive adhesive and Ag-plated contacts applied to the copper interconnection foil. Removal of ILD significantly improves the stability of back-contact modules. Enhanced reliability is observed for modules which combine ILD-free foil Cu backsheet, conductive adhesive and polyolefin or EVA as encapsulant.

Conclusion: Removal of ILD is the most interesting approach and is currently adopted by foil manufacturers. Importantly, the modules built with ILD-free backsheet and either polyolefin encapsulant or EVA showed respectively only 0.3% and 1.6% maximum power loss after 2000 hours of damp heat which is well below the requirement of the IEC 61215 standard.

Open Access Original Research Article

Non-cooperative Game Theoretic Modeling of Cognitive Radio Network for Enhancement of Bit Error Rate Performance

K. J. Kulkarni, B. S. Chaudhari

Current Journal of Applied Science and Technology, Page 1-8
DOI: 10.9734/BJAST/2016/21625

Game theory has been increasingly used to model and analyze wireless communication networks. Cognitive radio is a promising technology to cope up with bandwidth demand of multimedia users. Cognitive Radio improves bandwidth utilization by Dynamic Spectrum Access. This paper models cognitive radio using non-cooperative game theory. As cognitive radio opportunistically accesses the primary users’ resources, it can be modeled as a game between primary users and secondary users as well. Utility function for power allocation for secondary users is proposed and improvement in number of active secondary users is depicted. Performance is compared with the super-modular game. Proposed non-cooperative game model outperforms super-modular game in increasing the capacity of cognitive network and BER performance. It is observed that at Bit Energy to Noise ratio of 15 dB, BER of proposed non-cooperative game model is 10-4 as compared to 10-3 that is achieved for super-modular game.

 

Open Access Original Research Article

Similarity of Gas Percentage and Strength of Magnetic Field on the Electrical Characteristics Control of dc Plasma

Ahmed Rida Galaly

Current Journal of Applied Science and Technology, Page 1-12
DOI: 10.9734/BJAST/2016/22016

For nitrogen gas discharge, the control of argon percentage in (Ar-N2) gas mixture and in different magnetic field strengths, both separately in effect were investigated the electrical characteristics of DC plasma at constant low pressure (0.7torr). Under the influence of Ar gas mixture percentage (Ar%) or different magnetized discharges (B+), the plasma parameters were measured such as the discharge current-voltage curves, breakdown voltages, potential distribution, electric field distribution, and the cathode fall thickness (Zc) using the axial potential distribution method, it is noticeable that the breakdown voltages as a function of Ar % were more than those as a function of B+ by 17%, furthermore a reduction of (Zc) about 22% due to the applied B+ more than the case of the applied Ar %. Moreover, the electron energy distribution function (EEDF),electron temperature, and electron density were measured using single Langmuir probe, where electron temperature decreased about 38% for B+ more than Ar%, taking into account, general trend that values of Te and Ne are inversely proportional, where electron density increased about 37% for B+ more than Ar%. Furthermore, a non-Maxwellian EEDF was observed due to two groups of electrons were detected in the case of Ar%, in contrast, a Maxwellian EEDF was found  in the case of B+ due to one group of electrons.

 

Open Access Review Article

A Study of the State of Art B2B Integration Patterns, Components and Architectures

Edwin Mwendi Njeru, Felix Musau, Cheruiyot W. Kipruto Kipruto

Current Journal of Applied Science and Technology, Page 1-14
DOI: 10.9734/BJAST/2016/17592

In modern business operations, it has become imperative that processes, systems and sometimes organizations integrate. This is for various reasons such as maximizing profits, efficiency, expansion etc. Developing a robust integration plan, architecture and process mapping are key to any B2B integration. B2B integration can be defined as the integration of applications, programs, or systems extending the walls of an organisation and it include heterogeneous infrastructures, data, application software, and business processes integration between two or more businesses. The growth and change of systems and related technology is a very rapid arena, thus requiring almost every software system to have constant modification, integration and/or configuration, to provide enhanced integrated solutions to the changing world. Simply put it is developing an approach to expanded and extended collaboration, communication, resource sharing, optimization, profitability and efficiency within and between organisations. Integration is a general term for the tools and applications that are involved to enable different systems to interoperate and communicate with each other within or beyond a business enterprise, thus allowing complete integration of services and data sources among different applications. Current integration architectures are sufficient on the basis of service or product needs. But most B2B integrations do not sufficiently consider the involved processes, which contain most if not all stakeholders concerns and quality attributes. In this study, we take a look at the art of integration architecture and patterns, the impact on business processes, services and products as well as challenges hitherto.