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Volume 5 Issue 11 (November 2018)

S.No. Title & Authors Page No View
1

Title : Drying Performances and Economic Investigations of Forced Convectional Re-circulating Paddy Dryer

Authors : Kyaw Cho Cho Thin, Phyu Phyu Thant

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Abstract :

The main objective of this study is to investigate forced convectional re-circulating paddy dryer with three main aspects such as technical operation, drying performances, and economic analysis. To cover the primary aim of research, various initial moisture contents 30%, 25%, 20% and 16% wet basis of paddy are dried until final or safe moisture content of 14% wet basis. Technical operations including drying temperature requirement, water removal rate, mass flow rate of drying air, electrical and thermal energy consumptions are evaluated. Drying temperature of paddy dryer is assumed according to ambient temperature and its range varies within 60-44℃. In electrical energy consumption, both main mechanical drying machines, and supporting machines such as conveyors and elevators are considered. Maximum and minimum electrical energy consumptions are 578.36 kWh and 101.78 kWh for 30% and 16% initial moisture content paddy drying respectively. Since holding capacity of paddy dryer is 30 tonnes in average, specific thermal energy consumption differs within 19.209 kWh/tonne and 3.393 kWh/tonne. In terms of thermal energy, paddy dryer works with rice husk heating system. Thus, husk consumption is estimated to require 163.878 kg/hour for maximum drying time, and 136.565 kg/hour for minimum drying. Drying performance results indicate that average drying time required is about 7 hours with consideration of tempering while average drying capacity is about 4.813 tonne dry paddy/hour. Maximum drying rate of paddy dryer is 0.027 kg water/hour and 0.007 kg water/hour is for minimum rate. The resultant drying efficiency is 62.874% in average that represents further evidence of good paddy drying performance. Economic analysis is studied with milling quality achievement, operation cost, and profit for one-kilogram rice. Exceptional amount of rice that is about 95.75% is recovered after milling, and so this provides leading to extensive profit achievement by using forced convectional re-circulating paddy dryer.

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2

Title : An intelligent umbrella design scheme based on NodeMCU

Authors : Yiyang Cai, Chunyan Zhang, Nichen Niu

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Abstract :

The paper analyzes the characteristics of the existing traditional umbrellas, and takes the basic needs of users as the starting point. From the aspects of “functionality” and “structural design”, the traditional umbrellas are optimized and improved. Under the premise of fully considering the cost, reliability and volume of the umbrella, the NodeMCU single-chip microcomputer is used as the control component, which adds night lighting and weather forecasting functions to the traditional umbrella. The umbrella handle of the umbrella was redesigned, and the A-shaped umbrella structure was designed. This smart umbrella enhances the safety and convenience of users, and the solution is practical, contributing to the optimization of traditional umbrellas.

7-9
3

Title : Design and Implementation of a High Gain Microstrip Antenna Using Antenna Array

Authors : Sneha Sharma, Ushma Sharma

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Abstract :

In this project, the Design of a High Gain Microstrip Antenna using Antenna Array is proposed for wireless applications. The proposed antenna resonates at 5.6 GHz with bandwidth of 500 MHz making it suitable for wireless applications. The proposed antenna is designed on an FR4 substrate with an overall size of 50 mm × 45 mm. A parametric analysis is performed to understand the resonant behavior of the antenna by changing the size of the patches and the matrix of array. The feeding technique used here is micro strip line feeding.

10-11
4

Title : Firefly Optimization Design And Simulation Of A Single-Axis Helmholtz Coils For Spacecraft Components Testing

Authors : Alao O. J., Metu M. O., Amibor I. P., Ibe C. C., Oluyombo O. W.

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Abstract :

Geomagnetic field affects the attitude of Spacecraft. Thus, in order to prevent magnetic interference in spacecraft, there is need to measure the magnetic moment of spacecraft, eliminate the residual magnetism, and verify the magnetic characteristics of the subsystems and components for attitude control. This paper presents the design of a single-axis Helmholtz coils using firefly, a multi-objective metaheuristic optimization algorithm. The ultimate goal of optimization design in this research is to investigate the optimum coil geometry that will produce the maximum homogeneous magnetic field inside the coils. The modified Firefly Optimization Algorithm (FOA) was written using MATLAB program to obtain the optimum parameters for the Helmholtz coils. The parameters obtained were used to simulate magnetic field inside the coils. Simulations were carried out on three different coils geometries which served to investigate the coil geometry capable of producing maximum homogenous magnetic field inside the coils. The three coils geometries investigated are two rectangular and a square shapes. The first of the three designs is a square geometry where side “a = b”, the second is a rectangular geometry, where side “a = 2b”, while the third is also a rectangular geometry with side “a = 1/2 b”. It was observed that optimum magnetic field was achieved when the geometry of Helmholtz coils is a square shape. We can therefore conclude from the results obtained that the magnetic field is very homogeneous as long as the shape of the Helmholtz coils is approximately a square.

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5

Title : Mathematical analysis of predator-prey model with two preys and one predator

Authors : Hamid A. Adamu

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Abstract :

The Mathematics of ecology involves the study of populations that interact, thereby affecting each other's growth rates. This paper investigates a special case of such interaction.  To simplify the model, the paper make some assumptions that simplify the complication of the model. It specifically investigates the predator-prey model with two preys and one predator where the interaction between the species is analsysed both in two and three dimensions. Three dimensional Lotka Volterra model have been examined where a new assumption is added and  the solutions of the model have been  categorised into three stages representing the three coordinates system. These stages highlight the behaviour and the relationship of the preys with their individual predators. The relationship between the species is obtained in terms of mathematics equations where the equilibrium points of 3D Lotka Volterra model are obtained.  Different interpretations arise from those equations. It have been found among other results that the  prey population- x(t) will grows exponentially in the absence of predators-y(t) under the assumption that there is no threat to the prey other than the specific predator. This unbounded growth of x(t)  is what biologically expected in the absence of the middle-level population y(t). However, this stage is the best for the prey population because it is free from predation and the z(t) population, which is the second predator, is left without source of food. In general, the population of all the systems become extinct in the absence of x(t). Moreover, the stability analysis is examined by finding the eigenvalues of the Jacobean matrix. The relationship between the species is presented in plots using MAPLE software.

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6

Title : Motion Detector Security System for Indoor Geolocation

Authors : Nosiri O.C., Akwiwu-Uzoma C.C., Nmaju U.A., Elumeziem C.H.

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Abstract :

This paper focused on the development of a microcontroller based security system for indoor geo-location using motion detector. The system carried out intruder detection that reinforces surveillance technology to provide essential security with associated control and alert operations. The security pivots on the integration of cameras and motion detectors into web application. The Raspberry Pi, a smart surveillance system, takes input from the motion detector and controls (actuates) the pi camera for remote sensing and surveillance, sends the video to a web server which allows the user or homeowner to access the videos using a web application. The system, on intrusion alerts the owner by SMS, buzzes the alarm located at a convenient distant. The designed security system is characterized with efficient video camera for remote sensing and surveillance, featured with stream live video and records for subsequent replay and offers a cost effective ubiquitous surveillance solution, efficient and easy to implement.

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7

Title : Experimental Study on the Roll Motion Mode of the New Three-body Rescue Unmanned Craft Model

Authors : Di Zhang, Songlin Yang

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Abstract :

This paper took a new type of three body rescue unmanned craft model as the research object, and accomplished the measurement of different droughts, the roll-attenuation model test under different initial angles of roll and the curve of the roll angle with time, and then obtained the craft model’s result of self- shaking period and the attenuation of the amplitude. Based on System Identification Theory and the programming idea using Improved Genetic Algorithm, This paper established a system identification mathematical model of five roll-attenuation motion modes, then This paper used identification software to analyze the error betThis paperen the test value and the fitting value. The data of roll under one typical angle This paperre selected as the identification judgement. At the same time, the variation law of each moment coefficient affecting the rolling motion with the initial angles of roll was analyzed. By comparing and analyzing the experimental data of the trimaran and the catamaran model, This paper concluded that the three-body ship model has obvious anti-rolling effect than the catamaran. The method and research results provided reference for studying the wave resistance of such crafts, and provided technical support for improving the wave resistance of unmanned crafts.

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8

Title : Jatropha As Biodiesel: Potential And Problems

Authors : Hari Bahadur Dralami, Bishnu Kumari Budha

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Abstract :

Biodiesel from Jatropha is one of the alternative sources of energy. It can be produced after  transeterification process of vegetable oil and animal fat. In the context of Nepal, biodiesel from non-edible plant Jatropha can reduce the dependency on imported diesel to some extent. Jatropha has high potential in non cultivated land of the Terai districts and nominal feasible for mid hill area. It can be cultivated in proper soil condition, irrigation facility and with proper inter cropping also. Appropriate government policy, solving of the stakeholders problem are the key factors for the  promotion of biofuel. This paper presents the findings of possibility and potential problems for the promotion of biofuel from Jatropha in the Nepalese context. 

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