The adsorption isotherms and kinetic models were tested on the comparative sorption of oxyanions onto hexadecyltrimethylammonium bromide (HDTMA-Br) surfactant modified kaolinite clay also known as organo-kaolinite clay. The percentage removal of sulphate ion sorption was 40.42% and 78.13% onto MMC and BMC respectively, while chromate ion sorption was 26.72% and 58.62% onto MMC and BMC respectively. Thus, sulphate ion sorption shows better removal compared to chromate ion sorption of 33.60% and 24.97% onto MMC and BMC respectively. Langmuir and Frumkin isotherm models best described the adsorptive mechanism, hence the validity of the Langmuir-type separation factor RL (0<RL<1) was highly favourable and acceptable while the Frumkin isotherm gave the best regression correlation R2 although sulphate ion sorption responded better than the chromate ion sorption. The initial adsorption rate 'α' and the extent of surface coverage 'β' was higher on sulphate ion sorption compared to chromate ion sorption. In general the models tested predicts exothermic and chemisorption processes.

KEY WORD: Hdtma-Br, Isotherms, Kaolinite clay, Kinetics, Oxyanion, Sorption.

The large current development of aerospace and automotive technologies is based on the use of composite materials which provide significant weight savings compared to their mechanical characteristics. Correct dimensioning of composite structures requires a thorough knowledge of their behavior in small as in large deflection.This work aims to simulate linear and nonlinear behavior of laminates composites under three-point bending test. The used modelization is based on first-order shear deformation theory (FSDT), classical plate theory (CPT) and Von-Karman's equations for large deflection. A differential equation of Riccati, describing the variation of the deflection depending on the load, was obtained. Hence, the results deduced show a good correlation with experimental curves

KEY WORD:linear behavior ; nonlinear behavior ; laminate; Graphite epoxy; laminated beam; Three-point bending; Geometric nonlinearity ; failure ; macroscopic curve..

The problem of double diffusive convection with variable viscosity confined between the two horizontal plates is investigated by the linear stability analysis. The transformed governing equations are numerically solved by using the Galerkin method. We have studied both stationary convection and oscillatory convection.----

KEY WORD:Thermohaline convection, Variable viscosity, Exponential fluid, Galerkin method

BAM is the key element for the real-time achieves management aligned with business strategies. Proposed in this paper are a BAM design framework for the real-time business performance management and an implementation of BAM system prototype to show the applicability of proposed framework. The objectives of business activity monitoring to give real time information about the status and results of many operations, processes, and transactions. yeK benefits of BAM are to enable an enterprise to get better informed business decisions, quickly processing problem areas, and re-position Institutions and Organizations to take full advantage of growing opportunities

KEY WORD:BAM, Real Time, Performance, Monitoring, KPI, business process

Unusual, non-specular, fast-movingmeteortrail echoes are observed in the summer polar upper mesosphere near 90 km.Usually, at mid-latitudes, field-aligned irregularities cause non-specular trails, while in the polar region long-lasting irregularities are possibly sustained by charged meteor dust.The unusual meteor trails propagate downward and upward at speeds of 3.3-6.4 kms-1 along a slanted path length of 10.4 km between 87-93 km altitudes, merging in the middle and lasting for 8-10s. Here we propose that an electrical discharge is responsible for these trails. The corresponding horizontal electric field for the observed speeds is estimated up to 16.3 Vm-1 at 90 km.Both the long-lasting merging of two fast-moving plasma trails and the modest speed compared to those (~104-105 ms-1) of lightning leader process and of jets (< 400 ms) occurring above thunderclouds likely suggest a new type of meteor-trail leader discharge occurring in the summer polar upper mesosphere.

KEY WORD:---

Contemporary businesses are surrounded by socio-cultural, economic and environmental complexities, which influence their productivity and organizational image. This scenario demands an interdisciplinary management vision able to: cater to the economic necessity that sustains the actual capitalist logic; offer products which are socially responsible, environmentally conscientious and culturally compatible with the socio-organizational reality. Such positions have become fundamental in a society that witnesses innumerable negative impacts that distort or extinguish economic systems, ecosystems, social values and cultural identities. In this sense, this assignment enhances that the sustainable management is constituted by complexes actions that illuminate their environmental, cultural, economic, social and political responsibilities. Nevertheless, through a quant-qualitative analysis ruled by the elaboration of three bibliometric studies, it was planned to present the degree of commitment of the tourism and hotel industry in regard to the social, cultural, economic, political and environmental dimensions inherent in the proposals for sustainable development. What is observable, is that the contemporary hotel and/or tourism management has a predisposition to environmental and/or social external actions, and is not capable of establishing a participative planning to balance all the sustainability dimensions. The aforementioned scenario corroborates the necessity of establishing holistic criteria, which also contemplate the intergenerational solidarity.

KEY WORD: Bibliometric Analyses. Contemporary Hotel Industry.Hotel Management.Sustainable Development.

This paper conceptualizes a domain specific simulator for requirements prioritization; its aims at helping to identify appropriate prioritization strategies for a project in hand. The possible existing scenarios are difficult to analyze; they involve different variables, like the selection of: stakeholders (their availability, expertise, and importance); prioritization criteria; and prioritization methods. To demonstrate the feasibility of the proposed simulator elements, a well established general purpose simulator, called Arena, was used. The results demonstrate that, it is possible to build the suggested scenarios in order to study and make inferences about the prioritization strategies.

KEY WORD: Requirements Prioritization, Requirements Engineering, Software Engineering, Prioritization Techniques, Simulation.

A major treat to the comfort of human life has been imposed by the unintentional and great increased industrialization and urbanization. Their generations and land disposals of huge amounts of toxic materials and pollutants have contributed in contaminating our environment frighteningly. Synthetic dyes (SD) and heavy metals (HM) are becoming increasingly prevalent in soil and surface water environments, as the most dangerous pollutants. They are present a great concern worldwide, due to their toxicity to many life forms. Environment-friendly utilization of agricultural by-products/waste materials either as raw materials or in production of the so-called activated carbons (AC) is an important issue. Because, it is apparent from our literature review that the main factors characterizing these materials are the inexpensiveness, the local availability and their efficiencies in removal of heavy metals and dyes from contaminated water. A number of different agricultural by-product/wastes as renewable and potential sources for green adsorbent production has been listed in this review. Additionally, the paper has provided the reader with an overview of a number of case studies which were conducted by scientists and researchers. These case studies have pointed out to the efficient removal of SD/HM ions from aqueous solutions by the agricultural by-products/wastes in the form of a raw material, spent tea leaves (STL), spent coffee ground(SCG), and rice husk (RH) wastes were selected as a good examples. Besides, the efficient removal of such ions by AC produced from the same raw materials has been also reviewed. Both kinds are widely used adsorbents in the treatment of wastewaters. High adsorption capacity, cost effectiveness, and environmentally friendly, and their abundance in nature are the important roles which explain why the adsorption is economical for wastewater treatment. Comparison of different technologies of wastewater treatment especially heavy metals and dyes were also listed in this review.

KEY WORD: Adsorption, Activated carbon, Coffee grounds, Dyes, Heavy metal, Rice husk, Spent tea leaves

Modern scientific and technological move towards concrete production is aimed at achieving sustainable and affordable concrete construction. This move has led to the search for non-conventional local supplementary cementitious materials (SCM's) including the possibility of using industrial and agricultural based pulverized and combustible wastes in concrete construction. In this study, an experimental investigation was conducted on the potential use of sheanut shells ash, derived from the combustion of sheanut shells – an agro-based waste, as partial replacement of cement in concrete. The cement content in the concrete mix was partially replaced 0%, 10% and 20% by mass with sheanut shells ash. The effect of the ash on setting time and workability were examined. Five concrete cubes were prepared for each of the replacement levels from which three cubes were randomly selected from each replacement level and tested for compressive strength at three stages of curing age (14, 28 and 90 days). There were high and minimal reductions in the compressive strengths of the experimental cubes over the control cubes at the 14 and 28 curing age respectively. However, there was a significant increase in strength of the experimental cubes over the control cubes at the 90 days curing age. Though the ash has an improved increasing effect on strength, the findings will limit it use in situations where long term strength development is required.

KEY WORD:Sheanut shells ash, partial replacement, setting time, workability, compressive strength.

This paper provides an easy and effective approach to the load flow solution of Radial distribution networks. As compared to the various methods proposed in the past, this work presents a new technique consisting of load flow solution of the network, facilitated by the identification of all the nodes beyond a particular branch. The proposed method is quite accurate and reliable for the system having any number of nodes. The primary target of this work is to evaluate the results with high precision and convergence.

KEY WORD:Convergence, load currents, nodes beyond branch, Radial Distribution network.

Ionospheric total electron contents (TEC) disturbances following the 2011 great Tohoku earthquake on March 11, 2011 were observed by a GPS network in South Korea. The impulsive TEC enhancements were first observed approximately 16.5 minutes after the beginning of the earthquake. Various types of seismic waves were also observed over South Korea.To investigate more detailed disturbances in the TEC, we processed the GPS data with a sampling rate of 1Hz and applied a band-pass filter with corner frequencies of 0.0 and 0.005 Hz. Small-scale traveling ionospheric disturbances (TIDs) with a period of approximately 4minutes (~250 seconds) were observed from 6:15 to 7:10 UT. These variations are considered to be a clear manifestation of the acoustic resonance oscillations. We also observed medium-scale TIDs with a period of approximately 15 minutes and a duration of approximately 60 minutes. A remarkable finding is that the damping of the amplitude of the medium-scale TIDs was observed clearly in the time series.

KEY WORD:ionosphere; earthquake; TEC; disturbance

Digital watermarking refers to embedding watermarks in a multimedia documents and files in order to protect them from illegal copying and identifying manipulations. We proposed a technique is Hybrid DWT- SVD method for digital video watermarking. This paper presents a robust and secure watermarking algorithm for video sequence. Proposed scheme divide the video in to frames and then blue channel is used for watermarking insertion. Discrete wavelet transform is used for watermark embedding. Watermark is inserted in to mid frequency component for better resistance to video manipulation operation. PSNR and MSE are computed for testing the proposed method.

KEY WORD:...

This article presents the results of a student satisfaction study of an engineering program in relation to the quality of training received. The objective is to evaluate the existing system and propose a qualitative approach directing teaching practices to better meet the expectations of different stakeholders. As an indicator of performance of the process of teaching, descriptive statistical analysis of the level of student satisfaction evaluated using a questionnaire will confirm the usefulness of the proposed conceptual framework to improve the quality of training.

KEY WORD:Satisfaction, Quality, Higher education, innovation, teaching practices

This topic is the research woodchip boiler automation system modernization feasibility study, through the optimization of the concentration of O2 in the flue gas. Goal is to reserach and identify existing furnace automation control systems in one company, and the development of automation control systems improvement model to one chip furnace .

KEY WORD:Automation control systems, gas detectors, sensor systems and applications