Development and Performance Evaluation of a Manually Operated Cowpea Thresher

2009 ◽  
Vol 62-64 ◽  
pp. 239-246
Author(s):  
V.I. Umogbai ◽  
A. Shehu
Keyword(s):  
Performance Evaluation ◽  
Rural Areas ◽  
Feed Rate ◽  
Test Results ◽  
Human Diet ◽  
Optimum Performance ◽  
Nutritional Importance ◽  
And Performance ◽  
The Cost ◽  
The University

Threshing is one of the major problems associated with cowpea production in Nigeria. In spite of the food and nutritional importance of the crop to human diet, its threshing has been and remains a serious problem to the farmers. The techniques for threshing cowpea in most rural areas are still the traditional methods of seed separation which are uneconomical, labourous and time consuming. A manually operated cowpea thresher to stimulate manual threshing has been designed, fabricated and tested. The thresher was fabricated using locally available materials at the engineering workshop of the University of Agriculture, Makurdi. Two varieties of cowpea (B301 and C70) were tested on the thresher for performance evaluation in terms of thresher efficiency and mechanical (visible) damage. The test results revealed that for optimum performance, the thresher should operate at a cylinder speed of between 60-75rpm at a feed rate of 24kg/hr.94%-97% threshing efficiency was achieved for the two varieties of cowpea. The cost of production is N15,686:00

scholarly journals Maximizing Throughput of The GEO Satellite At C/Ku Bands

2021 ◽  
Author(s):  
Sabir Hussain ◽  
Ghulam Jaffer
Keyword(s):  
Rural Areas ◽  
High Performance ◽  
Satellite System ◽  
Data Traffic ◽  
Coverage Area ◽  
Geo Satellite ◽  
Cost Efficient ◽  
And Performance ◽  
The Cost ◽  
Ku Band

Abstract The need for broadband data has increased speedily but in underserved rural areas, the mobile connectivity of 3G and LTE is still a significant challenge. By looking at the historical trend, the data traffic and the internet are still expected to grow in these areas [1]. The next generation of satellites is trying to decrease the cost per MB having the advantage of higher throughput and availability. To maintain the performance of the link, choosing an appropriate frequency is evident. A multi-beam satellite system can fulfill the demand and performance over a coverage area. The high throughput satellites (HTS) fulfill this requirement using C and Ku bands. In this paper, we present the benefits of using Ku-band on the user site and the composite of C and Ku bands on the gateway site. This configuration has proved to be a cost-efficient solution with high performance over the traditional straight configuration. The data rate is improved five times both on upstream and downstream as compared to the existing available FSS system. Moreover, it has got an advantage to Ku-band user that they would enjoy the significant improvement in the performance without upgrading their systems.

Development and Performance Evaluation of Irish Potato Peeling Machine

2020 ◽  
pp. 11-23
Author(s):  
Ademola Olagoke Afolabi ◽  
Muhammad Lawal Attanda
Keyword(s):  
Performance Evaluation ◽  
Feed Rate ◽  
Irish Potato ◽  
Small Scale ◽  
Maximum Output ◽  
Household Level ◽  
Output Capacity ◽  
Randomized Design ◽  
And Performance ◽  
Potato Peeling

An Irish potato peeling machine was developed for use at small-scale/household level. Machine performance evaluation was carried out using three locally grown Irish potato varieties namely; Nicola, Bartita and Bawondoya respectively. A 22x3 factorial experiment in completely randomized design (CRD) with three replications was used for evaluation where tuber feed rate, shaft speed and variety were the independent variables and peeling efficiency, tuber flesh loss and machine output capacity were the performance indicators. Analysis of variance (ANOVA) results showed the effects of variety on peeling efficiency and feed rate on output capacity as highly significant (P=.01). Also, the interaction of speed and variety on peeling efficiency and the effect of variety on output capacity was significant (P=.05). The interaction of variety and speed at 480 rpm achieved a maximum mean peeling efficiency of 55.6% for Bawondoya. Similarly, at slightly higher speed of 510 rpm, the maximum mean peeling efficiency of 64.6% was achieved for Bartita. Flesh loss value of 0.84% was the least obtained and this was for Bartita while the highest flesh loss of 1.43% was observed for Nicola. At feed rates of 50 g/sec and 60 g/sec; the minimum and maximum output capacities of 31.3 kg/h and 59.2 kg/h were obtained respectively.

scholarly journals Development and Performance Evaluation of a Double Barrel Cassava Grating Machine

2020 ◽  
pp. 133-140
Author(s):  
Okonkwo Ugochukwu Chuka ◽  
Okafor Christian Emeka ◽  
Ihueze Christopher Chukwutoo
Keyword(s):  
Performance Evaluation ◽  
Feed Rate ◽  
Optimum Operating ◽  
Optimum Operating Condition ◽  
Operating Condition ◽  
Average Mass ◽  
Abrasive Surface ◽  
And Performance ◽  
Double Discharge ◽  
Central Composite

In this study, a double barrel cassava grating machine with double discharge outlet has been developed and its performance evaluated and optimized. The machine was designed to ensure very high throughput, easy decoupling and coupling and reduction in grating time. The performance evaluation of the grating machine was carried out using Design Expert Software. A central composite rotatable design of response surface methodology (RSM) was adopted in determining the optimum operating condition of the machine. The optimum operating condition obtained from the machine shows an optimum abrasive surface hole size of 6mm, feed rate of 11.8kg/min and an optimum feed rate of 20.16 kg/min; a through put capacity of 730.8kg/hr. The average mass loss, partially grated and completely grated were found to be 1.43kg, 1.48kg and 22.09kg, respectively for 25kg sample; which indicates effective grating and waste was drastically reduced with an average grating efficiency of 86.23%.

scholarly journals XXV Conference on Accounting and Controlling. Conceptions of the Cost and Performance Management held in Polanica-Zdrój, October 11–13, 2021

2021 ◽  
Vol 45 (4) ◽  
pp. 159-164
Author(s):  
Robert Kowalak
Keyword(s):  
Performance Management ◽  
Scientific Conference ◽  
Professional Work ◽  
Tax Management ◽  
And Performance ◽  
The Cost ◽  
The University

The text contains a report of the scientific conference organized by the Chair of Cost Account-ing, Tax Management, and Controlling at the University of Economics and Business in Wroclaw, from 11 to 13 October 2021, in Polanica- Zdrój. The conference in the Accounting and Controlling cycle, under the motto, The Conceptions of Cost and Performance Man-agement, addressed today's problems and challenges in managing costs and performance. That conference was very special because it was the 25th jubilee conference. At this year's conference, Professor Edward Nowak was thanked for his many years of professional work and for organizing all editions of the conference.

A SEGMENT BASED APPROACH FOR THE REDUCTION OF THE NUMBER OF TEST CASES FOR PERFORMANCE EVALUATION OF COMPONENTS

2009 ◽  
Vol 19 (04) ◽  
pp. 481-505 ◽  
Author(s):  
JOÃO W. CANGUSSU ◽  
KENDRA COOPER ◽  
W. ERIC WONG
Keyword(s):  
Performance Evaluation ◽  
Residual Error ◽  
Test Cases ◽  
Functional Requirements ◽  
Functional Behavior ◽  
Opposite Behavior ◽  
And Performance ◽  
The Cost ◽  
Software Development Techniques ◽  
Selection Of

Component-based software development techniques are being adopted to rapidly deploy complex, high quality systems. One of its aspects is the selection of components that realize the specified requirements. In addition to the functional requirements, the selection must be done taking into account some non-functional requirements such as performance, reliability, and usability. Hence, data that characterize the non-functional behavior of the components is needed; a test set is needed to collect this data for each component under consideration. This set may be large, which results in a considerable increase in the cost of the development process. Here, a process is proposed to considerably reduce the number of test cases used in the performance evaluation of components. The process is based on sequential curve fittings from an incremental number of test cases until a minimal pre-specified residual error is achieved. The incremental selection of test cases is done in two different ways: randomly and adaptively. The accuracy and performance of the proposed approach are dependent on the values of the desired residual error. The smaller the residual error, the higher the accuracy. However, performance has an opposite behavior. The smaller the error, the larger the number of test cases needed. The results from experiments with image compression components are a clear indication that a reduction in the number of test cases can be achieved while maintaining reasonable accuracy when using the proposed approach.

Cheope: A Tool for the Optimal Design of Compact Recuperators

2004 ◽  
Author(s):  
Alberto Traverso ◽  
Federico Zanzarsi ◽  
Aristide Massardo
Keyword(s):  
Performance Evaluation ◽  
Heat Exchanger ◽  
Software Tool ◽  
Theoretical Background ◽  
Surface Type ◽  
Pressure Drops ◽  
Economical Design ◽  
And Performance ◽  
The Cost ◽  
Optimization And Performance

This paper presents the organization, theoretical background and application of a new software tool for the optimization of the technical and economical design of microturbine recuperators. The code called CHEOPE (Compact Heat Exchanger Optimization and Performance Evaluation) considered two types of recuperator concept, which proved to be the most promising for microturbine applications: the furnace-brazed plate-fin type and the welded primary surface type. The general design rules for performance evaluation of gas-gas heat exchangers are summarized and specifically applied to these two types of recuperator. Moreover, the cost equation, employed to estimate the capital cost of these types of heat exchanger, is discussed. CHEOPE can be used both for solving the sizing problem and the rating problem. With regard to the former, the code is capable of a special optimization of the recuperator matrix, which takes into account the compactness, the pressure drops and the expected cost of the device. The objective function can be customized according to the designer’s priorities. The tests performed for the validation are presented, and three case studies are illustrated for three different microturbine sizes, for a 50kW, a 100kW and a 500kW machine.

scholarly journals The cem-ut rapid-fire compulsator test results and performance evaluation

2005 ◽  
Author(s):  
D.E. Perkins ◽  
S.B. Pratap ◽  
M.L. Spann ◽  
R.P. Thelen ◽  
M.D. Werst
Keyword(s):  
Performance Evaluation ◽  
Test Results ◽  
And Performance

scholarly journals Minimum Relevant Features to Obtain Explainable Systems for Predicting Cardiovascular Disease Using the Statlog Data Set

2021 ◽  
Vol 11 (3) ◽  
pp. 1285
Author(s):  
Roberto Porto ◽  
José M. Molina ◽  
Antonio Berlanga ◽  
Miguel A. Patricio
Keyword(s):  
Cardiovascular Disease ◽  
Performance Metrics ◽  
Predictive Performance ◽  
Large Set ◽  
Data Set ◽  
Automated Learning ◽  
Prediction Systems ◽  
And Performance ◽  
The Cost ◽  
The University

Learning systems have been focused on creating models capable of obtaining the best results in error metrics. Recently, the focus has shifted to improvement in the interpretation and explanation of the results. The need for interpretation is greater when these models are used to support decision making. In some areas, this becomes an indispensable requirement, such as in medicine. The goal of this study was to define a simple process to construct a system that could be easily interpreted based on two principles: (1) reduction of attributes without degrading the performance of the prediction systems and (2) selecting a technique to interpret the final prediction system. To describe this process, we selected a problem, predicting cardiovascular disease, by analyzing the well-known Statlog (Heart) data set from the University of California’s Automated Learning Repository. We analyzed the cost of making predictions easier to interpret by reducing the number of features that explain the classification of health status versus the cost in accuracy. We performed an analysis on a large set of classification techniques and performance metrics, demonstrating that it is possible to construct explainable and reliable models that provide high quality predictive performance.

scholarly journals Development and Performance Evaluation of a Prototype Electrically Powered Brush Cutter

2015 ◽  
Vol 58 ◽  
pp. 26-32
Author(s):  
R.S. Bello ◽  
A. Baruwa ◽  
F. Orisamuko
Keyword(s):  
Performance Evaluation ◽  
Electric Power ◽  
Improve Performance ◽  
Cutting Efficiency ◽  
Effective Efficiency ◽  
Minimum Height ◽  
And Performance ◽  
Blade Cutting ◽  
Continuous Power ◽  
The Cost

An electrically operated brush cutter was developed and fabricated to eliminate inherent ergonomic designs and costs of imported brush cutters and also improve performance efficiency. The machine incorporated an electric power pack which provides 4hours of continuous power for cutting, ergonomic design a ground wheel roller was introduced to reduce carpal disorder that could be associated with hand held brush cutters. Machine effective efficiency is rated at 46.67% and the blade cutting efficiency is 87.5%. The minimum height of cut is 1.3mm while the machine is capable of operating at variable conditions. The estimated cost of the machine is N10, 000.00 compare to the cost of imported machines

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