scholarly journals Brush-Holder Integrated Load Sensor Prototype for SAG Grinding Mill Motor

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1227 ◽  
Author(s):  
Carrasco ◽  
Álvarez ◽  
Velázquez ◽  
Concha ◽  
Pérez-Cotapos
Keyword(s):  
Measurement Errors ◽  
Large Scale ◽  
Mining Industry ◽  
Data Entry ◽  
Inspection Time ◽  
Inspection System ◽  
Design Development ◽  
Internal Parameters ◽  
Inspection Tasks ◽  
Grinding Mill

One of the most widely used electro-mechanical systems in large-scale mining is the electric motor. This device is employed in practically every phase of production. For this reason, it needs to be inspected regularly to maintain maximum operability, thus avoiding unplanned stoppages. In order to identify potential faults, regular check-ups are performed to measure the internal parameters of the components, especially the brushes and brush-holders. Both components must be properly aligned and calibrated to avoid electric arcs to the internal insulation of the motor. Although there is an increasing effort to improve inspection tasks, most inspection procedures are manual, leading to unnecessary costs in inspection time, errors in data entry, and, in extreme cases, measurement errors. This research presents the design, development, and assessment of an integrated measurement prototype for measuring spring tension and other key parameters in brush-holders used in electric motors. It aims to provide the mining industry with a new, fully automatic inspection system that will facilitate maintenance and checking. Our development research was carried out specifically on the brush system of a SAG grinding mill motor. These machines commonly use SIEMENS motors; however, the instrument can be easily adapted to any motor by simply changing the physical dimensions of the prototype.

Development of Physics Learning Module Based on Guided Inquiry with Light Wave Material in Class XI of Senior High School

2020 ◽  
Vol 1 (1) ◽  
pp. 1-10
Author(s):  
Evi Rahmawati ◽  
Irnin Agustina Dwi Astuti ◽  
N Nurhayati
Keyword(s):  
Large Scale ◽  
Learning Strategy ◽  
Student Response ◽  
Average Score ◽  
Small Scale ◽  
Design Development ◽  
Teacher Response ◽  
Student Responses ◽  
Analysis Design ◽  
Scientific Skills

IPA Integrated is a place for students to study themselves and the surrounding environment applied in daily life. Integrated IPA Learning provides a direct experience to students through the use and development of scientific skills and attitudes. The importance of integrated IPA requires to pack learning well, integrated IPA integration with the preparation of modules combined with learning strategy can maximize the learning process in school. In SMP 209 Jakarta, the value of the integrated IPA is obtained from 34 students there are 10 students completed and 24 students are not complete because they get the value below the KKM of 68. This research is a development study with the development model of ADDIE (Analysis, Design, Development, Implementation, and Evaluation). The use of KPS-based integrated IPA modules (Science Process sSkills) on the theme of rainbow phenomenon obtained by media expert validation results with an average score of 84.38%, average material expert 82.18%, average linguist 75.37%. So the average of all aspects obtained by 80.55% is worth using and tested to students. The results of the teacher response obtained 88.69% value with excellent criteria. Student responses on a small scale acquired an average score of 85.19% with highly agreed criteria and on the large-scale student response gained a yield of 86.44% with very agreed criteria. So the module can be concluded receiving a good response by the teacher and students.

Coal mining-disturbed land reclamation laws

2020 ◽  
pp. 15-26
Author(s):  
T. V. Galanina ◽  
M. I. Baumgarten ◽  
T. G. Koroleva
Keyword(s):  
Large Scale ◽  
Land Reclamation ◽  
Mining Industry ◽  
Development Program ◽  
Soil Disturbance ◽  
Open Pit ◽  
Open Pit Mining ◽  
Disturbed Land ◽  
Critical Problems ◽  
Production Output

Large-scale mining disturbs wide areas of land. The development program for the mining industry, with an expected considerable increase in production output, aggravates the problem with even vaster territories exposed to the adverse anthropogenic impact. Recovery of mining-induced ecosystems in the mineral-extracting regions becomes the top priority objective. There are many restoration mechanisms, and they should be used in integration and be highly technologically intensive as the environmental impact is many-sided. This involves pollution of water, generation of much waste and soil disturbance which is the most typical of open pit mining. Scale disturbance of land, withdrawal of farming land, land pollution and littering are critical problems to the solved in the first place. One of the way outs is highquality reclamation. This article reviews the effective rules and regulations on reclamation. The mechanism is proposed for the legal control of disturbed land reclamation on a regional and federal level. Highly technologically intensive recovery of mining-induced landscape will be backed up by the natural environment restoration strategy proposed in the Disturbed Land Reclamation Concept.

scholarly journals Methodology for Implementing the State Estimation in Renewable Energy Management Systems

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2301
Author(s):  
Yun-Sung Cho ◽  
Yun-Hyuk Choi
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
State Estimation ◽  
Measurement Errors ◽  
Large Scale ◽  
Test System ◽  
The State ◽  
Inner Function ◽  
Outer Function ◽  
Bad Data

This paper describes a methodology for implementing the state estimation and enhancing the accuracy in large-scale power systems that partially depend on variable renewable energy resources. To determine the actual states of electricity grids, including those of wind and solar power systems, the proposed state estimation method adopts a fast-decoupled weighted least square approach based on the architecture of application common database. Renewable energy modeling is considered on the basis of the point of data acquisition, the type of renewable energy, and the voltage level of the bus-connected renewable energy. Moreover, the proposed algorithm performs accurate bad data processing using inner and outer functions. The inner function is applied to the largest normalized residue method to process the bad data detection, identification and adjustment. While the outer function is analyzed whether the identified bad measurements exceed the condition of Kirchhoff’s current law. In addition, to decrease the topology and measurement errors associated with transformers, a connectivity model is proposed for transformers that use switching devices, and a transformer error processing technique is proposed using a simple heuristic method. To verify the performance of the proposed methodology, we performed comprehensive tests based on a modified IEEE 18-bus test system and a large-scale power system that utilizes renewable energy.

scholarly journals Hydropower, Geothermal, and Ocean Energy

MRS Bulletin ◽  
2008 ◽  
Vol 33 (4) ◽  
pp. 389-395 ◽  
Author(s):  
Ralph E.H. Sims
Keyword(s):  
Renewable Energy ◽  
Large Scale ◽  
New Technologies ◽  
Materials Science ◽  
Development Stage ◽  
Design Development ◽  
Ocean Energy ◽  
Improve Design ◽  
And Performance ◽  
Improve Reliability

AbstractSome forms of renewable energy have long contributed to electricity generation, whereas others are just emerging. For example, large-scale hydropower is a mature technology generating about 16% of global electricity, and many smaller scale systems are also being installed worldwide. Future opportunities to improve the technology are limited but include upgrading of existing plants to gain greater performance efficiencies and reduced maintenance. Geothermal energy, widely used for power generation and direct heat applications, is also mature, but new technologies could improve plant designs, extend their lifetimes, and improve reliability. By contrast, ocean energy is an emerging renewable energy technology. Design, development, and testing of a myriad of devices remain mainly in the research and development stage, with many opportunities for materials science to improve design and performance, reduce costly maintenance procedures, and extend plant operating lifetimes under the harsh marine environment.

scholarly journals Managing data entry of a large-scale interview project with optical scanning hardware and software

1991 ◽  
Vol 23 (2) ◽  
pp. 214-218 ◽  
Author(s):  
Cole Barton ◽  
Chris Hatcher ◽  
Karen Schurig ◽  
Paul Marciano ◽  
Kathryn Wilcox ◽  
...  
Keyword(s):  
Large Scale ◽  
Data Entry ◽  
Optical Scanning

Corporate social responsibility of mining industries

2015 ◽  
Vol 57 (5) ◽  
pp. 367-372 ◽  
Author(s):  
Deepankar Sharma ◽  
Priya Bhatnagar
Keyword(s):  
Corporate Social Responsibility ◽  
Community Development ◽  
Social Responsibility ◽  
Large Scale ◽  
Mining Industry ◽  
Developed Countries ◽  
Advanced Technology ◽  
Foreign Firms ◽  
Content Type ◽  
Corporate Social

Purpose – This paper aims to examine the community development approaches of large-scale mining companies, with particular reference to how they may engender community dependency. Design/methodology/approach – The paper begins with a review of corporate social responsibility (CSR) in the mining industry, corporate community initiatives and the problem of mining dependency at a national, regional and local levels. Findings – It outlines some of the reasons why less-developed countries (LDCs) experience under-development and detrimental effects as a result of their linkages with industrialized countries. LDCs are not able to take advantage of advanced technology and management skills due to being relatively poor in capital and skills, and foreign technologies compete unfairly with and destroy local production techniques, creating a pool of unemployable “marginalized” people. Holder’s of investments in LDCs demand annual returns for continued support – profits are taken out of the country or guaranteed by tax concessions. Unwillingness of foreign firms to train local people to take over management positions. Originality/value – This paper explores how the need to address sustainability issues has affected communities, and whether community development initiatives have been effective in contributing to more sustainable communities.

scholarly journals Android-Based Quiz Game Development Using Quizizz for Fourth Grade Students at SDN Catak Gayam 1 Mojowarno

2021 ◽  
Vol 2 (1) ◽  
pp. 46-54
Author(s):  
Risky Tri Amelia ◽  
Muhammad Nuruddin
Keyword(s):  
Large Scale ◽  
Fourth Grade ◽  
Student Response ◽  
Learning Activities ◽  
Student Interest ◽  
Design Development ◽  
Game Development ◽  
A Value ◽  
Fourth Grade Students ◽  
Expert Validation

Developments in the field of technology, especially education, are very influential in life. Educators as one of the main factors in supporting the quality of education must be able to utilize the types of media in an effort to carry out learning innovation strategies. The type of media that can support learning activities is the androidbased quiz game media using quizizz. This quiz game research is a development research. The android-based quiz game using quizziz has the purpose of knowing the design of android-based quiz game development using quizizz, the application of android-based quiz game products using quizizz, and the effectiveness of androidbased quiz games using thematic subjects. This research procedure uses a 4D model, namely define, design, development, and dissemination. SDN Catakgayam 1 Mojowarno was the location chosen to carry out research on a large scale, with 15 students enrolled in the 2020/2021 academic year. The techniques used in this study include media expert validation, material expert validation, RPP expert validation, student response expert validation, and documentation. Analysis of the data used is descriptive analysis. The results of the research on the application of quiz games obtained a total score of 87% which was validated by media experts, material experts and RPP experts. The validation contains media expert validation with a value of 92% which is very good, material expert validation 84% which is very good, RPP expert validation gets a score of 86% which is very good. Meanwhile, the effectiveness of the android-based quiz game obtained a total score of 82% which included student understanding with a value of 81.6% which was very good and student interest obtained a score of 82.5% which was very good. So it can be concluded, that an android-based quiz game using quizizz is stated to be very effective in supporting the learning activities of fourth grade students at SDN Catakgayam 1 Mojowarno.

scholarly journals Pengembangan Bahan Ajar Laju Reaksi Dengan Multipel Representasi Berbasis Inkuiri

2019 ◽  
Vol 6 (1) ◽  
pp. 32
Author(s):  
Pahriah Pahriah ◽  
Hendrawani Hendrawani
Keyword(s):  
Quantitative Data ◽  
Chemistry Education ◽  
Large Scale ◽  
Qualitative Data ◽  
Reaction Rate ◽  
Development Stage ◽  
Average Response ◽  
Design Development ◽  
Education Study ◽  
Final Score

This development aims to determine the characteristics and feasibility of multipleinquiry-based representation modules in the reaction rate material through theADDIE stage (Analyze, Design, Development Implementation and Evaluation)developed by Thiagarajan. This research and development was carried out untilthe development stage with adjustments based on development needs. Theassessment instrument used to determine the feasibility of the module is aquestionnaire sheet. The module feasibility was assessed by 2 material experts, 1media expert, 1 linguist, 1 colleague, 1 practitioner, and 10 students as subjects.Students involved in this study came from chemistry education study programsthat had undergone basic chemistry courses through limited trials. The data onthe value of the grievances obtained are still in the form of qualitative data andthen processed into quantitative data. Quantitative data are analyzed for eachaspect of the assessment. The final score obtained is converted to the level ofproduct feasibility qualitatively with the guidelines according to the criteria ofthe assessment category. The results of expert validation showed the averagepercentage (a) of material experts was 84% with very feasible categories; (b)media experts 90% with very decent categories; (c) linguists 97% with verydecent categories; (d) colleagues 79.6 categories worth%; (e) practitioners86.4% are very decent categories. The average response of students to productdevelopment results 89.5% with a very feasible category. This shows that themodules developed are feasible to be used at the stage of large-scale trials.

scholarly journals DUACS DT2014: the new multi-mission altimeter data set reprocessed over 20 years

Ocean Science ◽  
2016 ◽  
Vol 12 (5) ◽  
pp. 1067-1090 ◽  
Author(s):  
Marie-Isabelle Pujol ◽  
Yannice Faugère ◽  
Guillaume Taburet ◽  
Stéphanie Dupuy ◽  
Camille Pelloquin ◽  
...  
Keyword(s):  
Measurement Errors ◽  
Large Scale ◽  
Temporal Correlation ◽  
Error Reduction ◽  
Internal Tides ◽  
Global Ocean ◽  
Altimeter Data ◽  
Data Set ◽  
Error Budget ◽  
Spatial Coverage

Abstract. The new DUACS DT2014 reprocessed products have been available since April 2014. Numerous innovative changes have been introduced at each step of an extensively revised data processing protocol. The use of a new 20-year altimeter reference period in place of the previous 7-year reference significantly changes the sea level anomaly (SLA) patterns and thus has a strong user impact. The use of up-to-date altimeter standards and geophysical corrections, reduced smoothing of the along-track data, and refined mapping parameters, including spatial and temporal correlation-scale refinement and measurement errors, all contribute to an improved high-quality DT2014 SLA data set. Although all of the DUACS products have been upgraded, this paper focuses on the enhancements to the gridded SLA products over the global ocean. As part of this exercise, 21 years of data have been homogenized, allowing us to retrieve accurate large-scale climate signals such as global and regional MSL trends, interannual signals, and better refined mesoscale features.An extensive assessment exercise has been carried out on this data set, which allows us to establish a consolidated error budget. The errors at mesoscale are about 1.4 cm2 in low-variability areas, increase to an average of 8.9 cm2 in coastal regions, and reach nearly 32.5 cm2 in high mesoscale activity areas. The DT2014 products, compared to the previous DT2010 version, retain signals for wavelengths lower than  ∼  250 km, inducing SLA variance and mean EKE increases of, respectively, +5.1 and +15 %. Comparisons with independent measurements highlight the improved mesoscale representation within this new data set. The error reduction at the mesoscale reaches nearly 10 % of the error observed with DT2010. DT2014 also presents an improved coastal signal with a nearly 2 to 4 % mean error reduction. High-latitude areas are also more accurately represented in DT2014, with an improved consistency between spatial coverage and sea ice edge position. An error budget is used to highlight the limitations of the new gridded products, with notable errors in areas with strong internal tides.

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