Earticle

In this paper, a design of novel Mu Negative Group (MNG) 4segment SRR based microstrip patch antenna optimized for bandwidth, directivity and front to back lobe ratio has been presented. The microstrip patch antenna is designed using Ansoft HFSS version 13. Results were compared with MATLAB programming based on CAD formulas using equivalent circuit analysis of patch antenna. Nicolson Ross Weir (NRW) method has been used to retrieve the material parameters from transmission and reflection coefficient. Following this, a metamaterial-based-microstrip patch antenna has been designed. The unique shape proposed in this paper, gives remarkable enhancement in bandwidth by 30GHz, directivity by 2% and front to back lobe ratio by 9% but at cost of reducing antenna gain.

In this paper, on LTE-A system based MIMO pre-coding codebook selection algorithm are researched. Traditional pre-coding selection algorithm requires to complete the corresponding code to traverse, however improved traversal algorithm are optimized than traditional traversal algorithms, but it has high complexity. Based on the stud-y of the two kinds of pre-coding selection algorithm, we propose a modified algorithm, then the algorithm in EPA5, EVA5, ETU70 on the type of channel simulation and analysis, Simulation results show that the algorithm performance with almost no loss compared with the traditional method, while significantly lower the complexity.

Numerical investigation is carried out to analyze the heat and mass transfer in magnetohydrodynamic flow over a stretching sheet in the presence of thermal radiation and chemical reaction. The governing equations are transformed as ordinary differential equations using self suitable transformations, further these equations are solved numerically using shooting technique. The influence of pertinent parameters namely, magnetic field parameter, thermal radiation parameter, chemical reaction parameter, thermal and mass Grashof numbers etc., on velocity, temperature and concentration fields are discussed with the assistance of graphs. Numerical results are presented to discuss the behaviour of friction factor along with heat and mass transfer rate. Results shows that thermal radiation parameter have tendency to enhance the thermal boundary layer thickness.

Self-sufficiency in domestic palm oil supply remains unattainable in Nigeria, despite the various efforts of government to revive the subsector. The contribution of oil palm to employment and income in Nigeria is enormous. However, there is dominance of smallholders, low yield and inadequate documentation on productivity of the Oil Palm Production systems in the country. Thus, this study investigates Total Factor Productivity (TFP) of oil palm production systems in Edo and Kogi States, Nigeria using Tornqvist TFP index. Data were collected by administration of structured questionnaires using multistage sampling procedures. The results showed that the oil palm production in the study area is structured into small (≤ 10 hectare (ha), medium (11 – 50 ha) and large (≥ 51 ha). The TFP of the large, medium and small scale OPPS were 1.04, 0.99 and 0.82, respectively, while the overall TFP was 0.92. The large scale system had the highest productivity, followed by medium scale system in palm oil production in the study areas. Therefore, Promotion incentives should be directed to large and medium scale systems with upgrading of small scale farmers to medium scale farmers.

In this study, we analyzed the effect of nonlinear thermal radiation and non-uniform heat source/sink on MHD fluid flow between rotating horizontal plates with convective boundary conditions. By making use of the appropriate self-similarity transformations, the equations which govern the boundary layer equations are reduced into a set of nonlinear ordinary differential equations. Further, the resultant equations are solved numerically using the Runge-Kutta based shooting technique. Also, found the effect of different pertinent parameters on velocity and temperature profiles along with the friction factor and the local Nusselt number. Results displays that the radiation and non-uniform heat source/sink parameters have tendency to enhance the temperature profiles.

This paper deals with the preparation and characterization of Nickel-coated Alumina ceramic particles by Electroless Plating Technique. Nanosized α-Al2O3 powders of about 50nm in diameter are used for plating. The bath for Electroless Nickel Plating is prepared with NiCl2.6H2O, C6H5NaO7.H2O, NH4Cl and NaH2PO2.H2O. A bath temperature of 85°C, pH value of 8 and stirring time of 20 min is considered to carry out the deposition. The influence of sensitization and activation under different rinsing conditions on the Nickel coating over the Surface of Nano Alumina is studied. The results of these powders are analyzed through morphology, microstructure and phase with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffractometry (XRD) respectively.

LTE-A system, the UE and the eNodeB cell synchronization process is very important, it can detect the physical layer cell ID and access to time and frequency synchronization, and then process data communication. The key to cell synchronization is to acquire the cell ID. The ID of the cell can be obtained by ID blind detection, and the cell system information can be obtained. Therefore, it is very important to get the cell ID quickly and accurately. With the constant updating of the protocol, the design of the user's receiving end is also constantly updated. This paper proposes a reasonable and feasible ASIC design scheme and valid UVM (Universal Verification Methodology) verification platform from the perspective of studying the cell ID blind detection algorithm as well hardware implementation by balancing the fast accuracy of data operation with hardware cost, area and power consumption, it has important practical significance. Compared with the same module of other design, ASIC design of this area is 8.8% lower, 9.3% lower power consumption than the other design.