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FACTORS INFLUENCING THE SELECTION OF TEACHING …

experience difficulties in implementing learner centered teaching techniques due to several factors prevailing inside and outside the classrooms. Therefore, sometimes they practice methods other than CLT to teach English. This study surveyed those aspects, influencing the teachers' selection of teaching methods in a Nepalese EFL setting.

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Study on roadheader cutting load at different properties ...

Nov 04, 2013· Bilgin et al. studied some geological and geotechnical factors affecting the performance of a roadheader in an inclined tunnel. However, the domestic researchers have not researched the influence of the properties of coal and rock on roadheader cutting load with a systematic exposition, and foreign researchers mostly study the performance of ...

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(PDF) Evaluation of Conventional Drill and Blast and Using ...

The selection of a roadheader involves approaching a manufacturer who will provide a roadheader which can be utilized in sinking the Impumelelo decline shaft. The roadheader parameters must be able to handle the conditions of the Impumelelo project, that is, to excavate the decline shaft according to the design requirements.

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Ultra-wideband pose detection system for boom-type ...

Dec 07, 2017· Laser technology has been used to measure the posture parameters of roadheader [13, 14], but there are many limitations in this method: there is a lot of dust in the underground environment, which seriously affect the transmission of infrared, laser …

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KnelsonConcentrators -in-GravitySeparationProcess

In recent years, due to the rapid rise of gold price, the economic benefits of gold mining and production companies have been significantly improved, and a large number of advanced world-renowned mineral processing equipment have been applied in China,these equipment include: crushing and screening equipment produced by Metro and , Knelson Concentrator, etc.

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Selection of tunneling machines in soft ground by fuzzy ...

Selection of tunneling machines in soft ground by fuzzy analytic hierarchy process M. Kemal Ozfirat 1 In tunneling, it is very important to select the correct tunneling machines. Choosing a wrong method may be very costly to the company. There are many parameters affecting the decision stage of selection of the tunneling machine.

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(PDF) Multi-criterion Analysis of Factors Affecting ...

The article analyses factors affecting the possibility of maintaining roadways in Polish coal mines. The authors divided the factors into three groups – natural, mining and technical, as well as ...

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Performance Analysis of a Hybrid Power Cutting System for ...

An electrohydraulic hybrid power cutting transmission system for roadheader under specific working condition was proposed in this paper. The overall model for the new system composed of an electric motor model, a hydraulic pump-motor model, a torsional planetary set model, and a hybrid power train model was established. The working mode characteristics were simulated under the conditions of ...

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Factor Affecting Selection of Construction Equipment ...

Selection of Machinery. The selection of machinery is another factor needs to check very seriously. The machine should be advanced technology-enabled. Give you more productive results at minimum operating costs. Machinery manufacturer dealers or service persons should near you so that the anytime service need can be fulfilled.

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6 Key Factors for Lubricant Selection - Machinery Lubrication

6 Key Factors for Lubricant Selection Lubrication is critical, but it can be a complicated business. Every piece of equipment with moving parts needs to be lubricated, yet with so many factors to consider, it can quickly become overwhelming.

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Prediction of roadheader performance by artificial neural ...

Sep 01, 2014· The performance of a roadheader was recorded in order to determine the instantaneous cutting rate of the machine. ... prediction is one of the major parameters for the success of roadheader applications and generally deals with machine selection, production rate, and bit consumption. ... Some geological and geotechnical factors affecting the ...

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Factors effecting selection of distribution channels

Sep 17, 2016· 5. 5 Factors affecting Selection of Distribution Channel •Nature of the Product: Physical Character a)Perishability b)Size and weight of the product c)Unit value of a product d)Standardization e)Technical Nature of product. 6. 6 •Nature of the Market: In the words of Lazo and Corbin "Marketing managements select channels on the basis of ...

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Factors Affecting Channels of Distribution

Factors Affecting Channels of Distribution – Factors that Determine Selection of Distribution Channel Having known the distribution channel choices and intermediary options available, the marketing management of a company is now poised to make a suitable channel choice (s) and select the appropriate intermediaries in order to channelise the company's products to markets.

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A new model to predict roadheader performance using rock ...

Feb 08, 2013· Prediction of roadheader performance plays a significant role in the plan of tunnel construction, which is influenced by different key parameters, including rock strength, discontinuity in rock mass, type and specifications of roadheader machine, and brittleness. The main aim of this study is to build a robust empirical equation based on rock mass properties for the roadheader performance ...

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A Fuzzy AHP Approach to Select the Proper Roadheader in ...

main aspects influencing on the roadheader type selection include physical and mechanical characteristics, economic, technical and pro-ductivity factors (Ebrahimabadi et al., 2012). For a successful roadheader selection, some alternative machines are primarily chosen in ac-cordance with existing technical and economic condition.

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Index | Civil Excavations and Tunnelling: A practical guide

technique/technical factors. equipment selection and operation, 120, 121. losses due to, 417–418. technology (unusual/recent/future developments) drilling, 171–172. underground mission/situations with great demands, 263–268. telescopic dumpers, 158. telescopic TBMs (double-shield TBMs), 205, 210, 215, 216, 272. temperature control, 384 ...

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Factors affecting job selection preferences of accounting ...

Factors affecting job selection preferences of accounting students in Malaysian universities iii DECLARATION We hereby declare that: (1) This undergraduate research project is the end result of our own work and that due acknowledgement has been given in …

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(PDF) Surface Miners: Evaluation of the Production Rate ...

By comparing the results with the literature, it was found that the proposed models are valid in predicting the instantaneous cutting rate of roadheader especially at the cutting depth of 7–9 mm.

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A model to predict the performance of roadheaders based on ...

A brief background of methods for roadheader performance prediction Sandbak (1985) and Douglas (1985) used a rock classifi-cation system to explain the changes of roadheader advance rates at San Manuel Copper Mine in an inclined drift at an 11% grade4–5. Also, Bilgin et al. (2004) investigated the factors affecting the performance of a ...

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Factors Influencing the Media Selection - Mass ...

Jan 09, 2013· The problem of selection of the best medium or media for a particular advertiser will vary greatly, depending on the particular situation, circumstances and different other factors in which a person is conducting individual business. Media selection involves a basic understanding of the capabilities and costs of the major media.

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Factors affecting media selection - SlideShare

Nov 13, 2014· 8. Media selection In making media decision, we have to consider the following factors : 1) The financial allocation for advertising. 2) The nature of the product and the demand for it. 3) The type of the prospects, their location and other characteristics.

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1. Introduction

Some geological and geotechnical factors affecting the performance of a roadheader in an inclined tunnel Tunneling and Underground Space Technology 2004 19 6 629 636 12 Qian Q. Report on Advances in Rock Mechanics and Rock Engineering 2010 Beijing, China China association for science and technology (Chinese) 13 Xu X. YU J. Rock Fragmentation ...

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7 Factors Affecting your Selection Process - Saville ...

May 18, 2017· Seven factors affecting the outcomes of your selection process. July 6, 2020 May 18, 2017. ... By being aware of how these seven factors can either positively or negatively affect your selection process, you can ensure you receive high-quality candidates that will be suitable for the role and ensure continued success for your organisation.

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[PDF] A Model to Predict The Performance of tunnelling ...

One of the most important factors in determining the economic efficiency of rapid excavation systems for tunnel and mining activities is the prediction of the cutting performance of these systems. In the past, different models were developed based on site observations, laboratory smalland full-scale cutting tests. However, it is important to note that none of these models takes into account ...

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Along with Producer based factors, few more factors that ...

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ …

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Roadheader – A comprehensive review - ScienceDirect

Jan 01, 2020· In spite of these developments, cutterhead selection and cutting tool configuration are still very difficult to assess. Cutter head selection is also based on the performance under different geological conditions. 3.2. Influence of geology on roadheader performance. Several rock properties affect the cutting force of a RH.

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The performance prediction of roadheaders from easy ...

Oct 03, 2015· The clay content of rock can significantly affect the performance of roadheaders in wet conditions. Bilgin et al. reported that the ICR of roadheaders decreased from 50 to 20 m 3 /h in a sticky (muddy) clayey zone. Thuro and Plinninger showed that the roadheader performance generally decreases with increasing percentage of clay and silt. In wet ...

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JME

to be the most important factors affecting the selection of a production method [9]. Finally, Rafiee et al. have considered six main criteria: displacement, factor of safety (FOS), costs, time, mechanization, and applicability factor for the selection of a support system design. According to

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Estimation of Specific Energy and Evaluation of Roadheader ...

Jul 28, 2021· Specific energy (SE) is defined as the amount of work required to cut a unit volume of rock and is used to estimate the performance of excavation machines. Generally, the SE value is produced from full-scale or small-scale rock cutting tests. However, these tests require expensive equipment and experienced personnel, and the testing procedure is time consuming and impractical. Therefore, for ...

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Selecting efficient support methods for tunnel construction

the importance percentages (IPs) of the controlling factors. 2.1 Controlling factors Four technical factors are used to represent the main projects' technical conditions which control the selection of support methods, these factors are ground conditions, tunnel depth, constructibility, and tunnel excavation method (Toma, 2005).

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(PDF) Roadheader applications in mining and tunneling ...

Roadheader applications in mining and tunneling industries H. Copur1, L. Ozdemir2, and J. Rostami3 1 Graduate Student, 2 Director and Professor, and 3 Assistant Professor Earth Mechanics Institute, Colorado School of Mines, Golden, Colorado, 80401 ABSTRACT offer the capability to excavate rocks harder and more abrasive than their counterparts, such as the continuous Roadheaders offer a unique ...

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Study on Roadheader Cutting Load at Different Properties ...

Nov 04, 2013· Bilgin et al. studied some geological and geotechnical factors affecting the performance of a roadheader in an inclined tunnel. However, the domestic researchers have not researched the influence of the properties of coal and rock on roadheader cutting load with a systematic exposition, and foreign researchers mostly study the performance of ...

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Axioms | Free Full-Text | Error Compensation of Strapdown ...

The strapdown inertial navigation system can provide the navigation information for the boom-type roadheader in the unmanned roadway tunneling working face of the coal mine. However, the complex vibration caused by the cutting process of the boom-type roadheader may result in significant errors of its attitude and position measured by the strapdown inertial navigation system.

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A State Monitoring Method of Roadheader Cutting Arm …

header, more factors can lead to failure and usually affect each other, and there are also some logical rela-tionships between the faults. Therefore, it is difficult to diagnose the faults of roadheader. In recent years, the scholars and experts in China put forward some …

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Study on Roadheader cutting load at different properties ...

Jan 01, 2013· Bilgin et al. [11] studied some geological and geotechnical factors affecting the performance of a roadheader in an inclined tunnel. However, the domestic researchers have not researched the influence of the properties of coal and rock on roadheader cutting load with a systematic exposition, and foreign researchers mostly study the performance ...

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Selection of Channels of Distribution: Top 6 Factors ...

Selection of a particular channel is a decision upon which the success of all the marketing efforts of an enterprise depends. Therefore, a particular channel must be selected only after a careful study and consideration of all the relevant factors. Factors affecting the selection of channels of distribution can be divided into following parts: 1.

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