Archives-June...  

This study examines the problem of MHD mixed convection flow between a horizontal parallel flat wall and a long wavy wall in the presence of thermal radiation, Dufour effect and first order chemical reaction embedded with slip boundary condition. The governing equations include the continuity, linear momentum, energy and mass transfer equations which are solved analytically by using exact solution method. The results of this parametric study on the velocity, temperature and concentration distributions are shown graphically and the physical aspects of the problem are highlighted and discussed. The effect of shear stress, rate of heat and mass transfer coefficients at the channel walls are displayed in tables.

The disaster management in any country is a process that works at various activities of prevention levels and operational models. An important element of the improvement of the civil protection in the individual countries and of their coordination in joint activities is the improvement of the existing Integrated Disaster Prevention Policy activity. The huge variety of organizational concepts of the systems for disaster prevention, accidents and catastrophes in the different countries, pose a lot of questions related to the improvement of the efficiency. The coordination that could benefit from the good and effective practices and produce a common, integrated and comprehensive European view and concept for the Regional Disaster Prevention Policy. This issue is getting more and more important, the large-scale emergency events and disasters are covering the territories of several regions, and- because of their magnitude and consequences- require the assistance and cooperation of international bodies working in the sphere of civil protection.

The present article discuses the problems of relativistic invariance and commutation relations at unitary quantum theory. The scalar analogue of the main (principal) equation of the unitary quantum theory together with the Poisson equation are solved numerically in this paper. The value of the electrical charge and also the fine-structure constant, are found, which are in good agreement with the experiment. The evaluation of the electrical form factor end the mass of such a particle is also carried out.

Environmentally sustainable (green) supply chain management (GSCM) has emerged as an important organizational philosophy to achieve corporate profit and market share objectives by reducing environmental risks and impacts while improving ecological efficiency of these organizations and their partners companies. The number of organizations contemplating the integration of environmental practices into their strategic plans and daily operations is continuously increasing day to day. Numerous initiatives have provided incentives for organizations to become more environmentally benign. Organizations view many of these environmental programs, which may include technological and organizational development projects, as possible alternatives for gaining or maintaining a competitive advantage. One environmental program area that continues to gain in importance is one that focuses on the external relationships among organizations. Environmentally conscious business practices have been receiving increasing importance from both researchers and practitioner’s point of view. Interdisciplinary research has integrated the efforts of management, engineering, physical and social sciences to investigate the issues relevant to this GSCM. Similarly, multifunctional groups within organizations and external stakeholders have a role in decisions related to organizations and the natural environment. Green supply chain decisions are one of the latest issues facing organizations with strong internal and external linkages.

This paper presents a study which examines the foundation of the present day scientometric as laid down by Derek de Solla Price in his award winning work: A general theory of bibliometric and other cumulative advantage processes, published in Journal of the American Society for Information Science. In the study, the importance of scientometric in research evaluation is identified, and a new concept of scientometrick is introduced. The error made and concealed in the trivial modification of the effect of contagion single-edged success introduced by Derek de Solla Price is exhumed with elucidatory discussion. The features of the Price’s model do not seem to correlate well when compared with the real time situations in academic publishing process. Except that Derek de Solla Price stated so, it is doubtful that the Price’s model is relevant and useful in real time bibliometric and academic publishing processes.

This study examined the impact of fish farming on household food security and livelihoods for fish farming and non fish farming households in Siaya County. Currently fish farming remains under developed in Western Kenya where pond productivity is low and not rising, despite the effort of several players. Further, capture fish in Lake Victoria and rivers has subsequently declined. These scenarios called for the need to examine the production systems and their current performances. The objective of the study was to determine the socio-economic characteristics of fish farmers and their fish farming practices. A cross sectional survey research design was adopted for the study. Stratified random sampling was used to select fish farming and non fish farming households. Key informants were selected through purposive sampling method. Data gathering was through multiple methods; where primary and secondary data were collected. Data analysis made use of descriptive statistics, where numerical and non-numerical summary of data were used. Chi-Square was used to test the independence between variables. Findings were; fish farming in the study area is economically rewarding and profitable. It is capable of creating employment, increasing income and improving the livelihoods of the people. Fish farming in the area is male dominated, however, women are used to manage the ponds and there is less participation of youth in fish farming. Females and youths need to be encouraged to participate in fish farming in the area as a means of increasing their income and improve their standard of living. The main production level is semi-intensive where mixed sexed tilapia production system provides seed for subsequent restocking. Most of the fish farms are privately owned by individuals who have little access to finance. Therefore, government participation in fish farming should be encouraged to boost the quantity of fish available for consumption. Fish farmers should be organized into formidable groups such as self help and cooperative to realize economies of scale in the purchase of inputs and sale of their fish.

The voltammetry methods have revealed in the water of the Cotonou channel, the presence of organic and inorganic complexes of metals, such as: Zn-Carbonate, Zn2+, ZnSO4, Zn-OM, Cu-Carbonate, Cu2+, Cu(OH)2, Cu-OM, Pb-Carbonate, Pb2 +, Pb-OM, Cd-Carbonate, Cd2+, and Cd-OM. Their concentrations were variable with the water pH and depended on the season. At pH values ranging 6.5 - 7.2, metals were complexed by carbonate ions present in the water. Zinc is predominantly present as Zn2+ in the rainy season and Cu2+ levels were decreasing when pH was increasing. 80% of the total lead appeared to be complexed as Organic matter complex lead (Pb-OM), and cadmium (Cd-OM) which, unlike other metals, was mainly present in free Cd2+ form.

The use of various fixed beds having higher surface area is effective in removing organic matters and nutrients from municipal wastewater. Due to the higher specific surface area, fibrous materials are often considered a better choice for increased microbial support and treatment efficiency. In the present study two naturally available fibrous materials such as sisal and Oil palm Empty fruit Bunch (OPEFB) fibers having higher specific surface area were used as packing media in two different bio-reactors for sewage treatment, under batch mode and similar experimental conditions. Experimental results obtained were satisfactory at a packing density of 50 kg/m3. The reactors were continuously aerated for different contact times. At a contact time of 72 hours and Mixed Liquor Suspended Solids(MLSS) concentration ranging from 1500-2000 mg/L, the reactors filled with Sisal and OPEFB fibers shows satisfactory COD removal of 69.5% and 73%, BOD5 of 74% and 79.7%, NH3-N of 69% and 72.7%, and Ortho-phosphate of 81% and 82.3% respectively. The study reveals that these fibrous medias could be acceptable for efficient removal of organics and nutrients present in the sewage.

This present work aims to investigate dyeing performance of some new azo disperse dyes belonging to diazotization of 1, 4-bis (2-amino-1, 3, 4-thiadiazolyl) benzene and coupling with different amines as to comparing and contrasting depth obtained of shade and levelness. Some new dyes, such, has been examined, and assessed. The study was concerned mainly with dye uptake, behavior and efficiency. Color measurements, kinetics and thermodynamic parameters were involved. Conventional dyeing, was considered as control for obtained results.

4-(naphthalen-2-yl)thiazol-2-amine (I) on reaction with 2-bromo-1-arylethanone(IIa-f)yields6-Aryl-3-(naphthalen-2-yl)imidazo[2,1-b]thiazole (III a-f). The structures of all the compounds series (IIIa-f) were characterized analytically. The compounds were also monitored for anti microbial activity