Agrociencia Journal

Title	Computer Simulation of Performance and Transient Behavior of A Salt Gradient Solar Pond
Paper ID	F6nDc
Keywords	Solar pond, salt gradient, temperature and concentration fields
Abstract	Read More... Performance and the transient behaviour of a salt gradient solar pond through computer simulation are investigated in this paper. All thermal and hydrodynamic properties of the fluid, which is taken to be sodium chloride solution in water, have been considered to be varying with temperature and concentration and this will cause energy and mass transfer equations to be coupled. Solar radiation reaching the pond and the amount absorbed by it as well as ambient temperature are modeled according to geographical data. Temperature and concentration fields obtained by software simulation have been compared with the experimental results from a solar pond located in Tunisia [4], with the same conditions, and good agreement is observed.
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Title	Multi network handover decision using extended multi criteria decision making technique
Paper ID	3Cigy
Keywords	Heterogeneous wireless network, vertical handover, seamless mobility, mobile node, received signal strength.
Abstract	Read More... In a heterogeneous environment various wireless networks are coexisting simultaneously. This environment is formed by integrating various radio access technologies like wireless in local loop (WLL/WLAN), wireless wide area network (WWAN), cellular etc. These technologies offer users to connect to network at anytime and anywhere. Now the mobile devices are equipped with multiple interface terminals so that the devices can select the best network. Selecting a suitable network which satisfies the different need is very complex task in heterogeneous network. The decision is based on different network criteria and user’s information. In this paper a handover decision technique is presented which is used to select most appropriate network among various networks.
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Title	Preliminary Assessment of Heavy Metal Concentration in Soil of the Calabar Port Authority, Cross River State, Nigeria
Paper ID	q8vdr
Keywords	Metal Content, Intel’s Work Environment, Calabar Port Authority, Industrial Activities, Soil
Abstract	Read More... The soil system of the Calabar Port environment has in the past three decades been subjected to irreparable environmental change, as a result of the continuous expansion of industrial activities coupled with the indiscriminate discharge of untreated effluents on the soil. The study specifically assessed the impact of industrial activities on heavy metal content of soil within Intel’s work environment. The soils bordering Intel’s work environment are derived from geologic materials of coastal plain sands. Surface (0 – 15cm) and subsurface (15 – 30cm) soil samples were randomly collected within and adjoining perimeter fence of Intel’s work environment. The soils were analysed for physico-chemical and heavy metal contents. Result obtained revealed that the heavy metal contents of soil are low and within the natural limits for mineral soil environment. The order of magnitude of heavy metal concentration in surface soil is as follows: Fe>Mn>Zn>Ni>V>Cr>Cd>Cu, whereas, in the subsoil, the order is as follows: Fe>Mn>Zn>Ni>V>Cu>Cr>Cd. The result also showed that industrial activities in the area adversely affected soil nutrients possibly due to biomass contamination by pollutants, thereby affecting the rate of litter decay as well as the low density of trees mostly within Intel’s premises which affected the accumulation of biomass. The study therefore indicates that the concentration of heavy metal in Intel’s work environment is within the threshold limits for mineral soil environment.
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