bluuebunny/crossref_metadata_2025_split huggingface dataset:
Correlation of rock characteristics to gold content in the Honje Formation and Cipacar Formation, Pandeglang, Banten
Authors: Usman D N , Sulaksana N , Hirnawan F , Haryanto I , Widayati S , Sriyanti S , Pulungan L 
Published: May 2020

Abstract
Gold deposits are economic deposits, the formation of gold deposits in nature is one of them epithermal gold deposits in the Au-Ag mineralized zone. Gold mineralization is influenced by a hydrothermal solution that flows through rock permeability, resulting in an alteration process that changes the chemical composition, mineralogy, and texture of the original rock. One variable that affects the presence of veins carrying valuable ore minerals is fracture structure. This study aims to determine and analyse the relationship /correlation of rock solids to the level of gold deposits using the correlation regression method. The methodology used is massive data collection through geological mapping, log-drill data analysis, Data Assay analysis, data processing and analysis assisted by using correlation regression through validation and verification of drill data. The results of processing and analysis of muscular data notified by the RQD value and log-drill data obtained the results of multivariate normality test based on the Au model = 8,219-2761 RQD and Ag = 90,388 + 0.977 RQD as follows: 1) When the RQD is zero, then the Au will be valued amounting to 8,219. However, when the RQD increases by 1 unit, the Au will decrease by 2,761. 2) When the RQD is zero, then Ag will be worth 90,388. However, when the RQD rises by 1 unit, then Ag will rise by 0.977. Then the Meaning Mean Test is performed where the result H0 is Received, with the understanding that there is a significant relationship between RQD on Au-Ag levels, understanding that the change in thickness of a thicker ore is followed by an increase in the higher Au level, tcount = 0.382 and the significance is 0.703. The understanding is that Au levels are correlated with the presence and presence of hefty that is notified by RQD.
Coal handling quality from pits to stockpiles to market specifications
Authors: Pulungan L , Arbianto V 
Published: May 2020

Abstract
In the coal trade, coal quality becomes the main thing that must be consider. The quality of coal that is not following the specifications desired by consumers causes coal prices below. Parameters of coal quality consist of calorific value, water content, an ash content of flying substances, and sulfur content. The quality of this coal will always recheck with every change of place. Before coal is sold, it is better to monitor the quality of the coal starting from the pit. At the coal quality monitoring location, there are four seams, including seam A1, seam A2, seam B and seam C. Monitoring of coal quality is carried out at seam C to be mined. Monitoring of coal quality from the pit to the stockpile is done by taking representative samples from drilling, mining, and stockpile activities. Then the samples were analysed by proximate analysis. Drilling samples was taken by coring sampling from eight drill points. Sample from the pit are taken by channel sampling method, in the mining pit sample are divided into three parts, namely the upper part (coal with 10 cm thick clay insert, called layer 1), the second middle part (coal with 20 cm thick clay insert, called layer 2 ) and the bottom three (coal without clay insertion, called layer 3). The purpose of the division is carried out as a handling coal from being mixed into three parts. Samples from the stockpiles are taken by grab sampling method from three stockpiles originating from layer one, layer two, and layer three. For layer one coal, the difference in ash content in pits and stockpiles is 1.6%, the difference in total sulfur content in pits and stockpiles is 0.7%. For layer two coal, the difference in ash content in pits and stockpiles is 1.5%; the difference in total sulfur content in pits and stockpiles is 0.7%. In layer three. The difference in ash content in pits and stockpiles is 1.5%, the difference in total sulfur content in pits and stockpiles is 0.7%.
Monitoring of mine waste from copper ore flotation
Authors: Pulungan L , Usman D N , Kurniawan E A , Galiano R A 
Published: May 2020

Abstract
The copper ore flotation conducted by PT XYZ produces copper, and other metal concentrates as tailings. The copper concentrate will then be processed as industrial raw material, while the tailing waste is dumping a waste dump. The copper ore flotation tailings must follow the tailings waste management rules. Monitoring tailings quality testing must be done, which includes physical and chemical parameters. The results of the analysis of copper ore flotation tailings are comparing with the provisions issued by the Ministry of Environment No. 92 of 2011. And 382 in 2016. Furthermore, to monitor the state of seawater around the mining site, water quality testing is divided into three zones, Zone A with into> 120 m, Zone B 0 - 120, and Zone C (tailings free). Seawater quality monitoring is carrying out in zone B. The quality test results tailing flotation Copper ores how physical and chemical parameters are below the threshold set by the Ministry of Environment. Whereas monitoring of seawater quality carried out in zone B, TDS exceeds the intensity at S15B, while dissolved metal concentrations are below the threshold at all stations.
Optimization and slope stability coal mine with dewatering system using limit equilibrium method
Authors: Iswandaru I , Isniarno N F , Hirnawan R F 
Published: May 2020

Abstract
Mining activities related to excavation or landfill will always face problems with slopes, both in the form of working slope and final slope, in addition the groundwater factor in the rock layer increases the burden by filling pores and reducing friction inter-grain influences the slope stability. The slopes must be analyzed for stability to prevent landslide hazards because they involve work safety, equipment safety, and smooth production. PT. XYZ is a coal mining company located in the Lilin river, South Sumatra, planning to optimize and stabilize the final slope to a depth of 120 m. Geotechnical drilling has been carried out as many as 3 points with a total depth of 270 m and 80 samples of rock and soil testing. The results of optimization and stability of the slope by conducting dewatering at each elevation to obtain optimal slope conditions at PT. XYZ can be done up to elevation of -130 meters above sea level with a depth of 142 meters with an angle of 35° with the condition of the ground water level must be maintained at the halfway point of the slope (GWL Chart No. 3). Under water saturated conditions (GWL Chart No. 5) at the same elevation the permissible angle is only 25° with a final slope height of 136 m.
Design of Graphical User Interface (GUI) on IoT-based remote laboratory for Programmable Logic Controller (PLC) practicum and pneumatic simulation
Authors: Pratama L A , Kustija J 
Published: May 2020

Abstract
The remote laboratory system allows users to conduct lab work via a remote-controlled lab computer. Each computer has a different interface to interact with the operating system. This affects the comfort and effectiveness of users in accessing remote laboratories. Based on this, we need a support system in the remote laboratory to maximize user time in practicing. The interface on the computer lab becomes an important factor in supporting a practicum that uses computers. GUI (Graphical User Interface) is an interface that allows users to interact with the operating system graphically. Unlike the CLI (Command Line Interface), which uses the command line, the GUI uses a graphical menu, thus allowing users to more easily and efficiently interact with the operating system. The main features of the GUI are made up of three components. The components in question include time management features, application selection, and notifications. If already connected to the GUI, users can easily open the applications provided, such as CX-Programmer, Pneumatic Festo Fluidsim, and the camera. Also, the GUI functions as a timer and notifies users. This can be seen from the automatic connection and disconnection between the user and the computer lab if the practicum time is up.
Role playing as experiential learning method for quality engineering education
Authors: Wahyudi R D , Hadiyat M A 
Published: May 2020

Abstract
Every learning activity should be well designed so that it can be easily understood and can attract the attention. However, challenges will arise for quantitative courses such as quality engineering (QE). The QE course is quantitative course in industrial engineering aimed for engineering system to produce qualified product. This paper will discuss about role playing as learning method for quality engineering courses. Role playing is designed by considering students as a part of Research and Development (R&D) department from Food Company trying to improve quality of products. Role playing is fully conducted for one semester with integrated activities consisting of teaching, R&D Meeting, market survey, experimentation and presentation. To build atmosphere, the course’s materials are delivered like training. Pudding experiment was chosen to help students to understand types of DoE particularly. In addition, student gets the role of R&D such as leaders, surveyors to conduct market research, analysts to determine Critical to Quality which is worth to be controlled. Thus, learning process is conducted with experiential learning method. By using this method, the central tendencies of mark are 77,5 for mean, 78 for median and 84 for mode. Thus, we can draw that students can easily achieve Learning Objectives in a fascinating way.
Women in mechanical engineering at vocational high school
Authors: Firdaus R A , Abdullah A G , Sumarto S 
Published: May 2020

Abstract
The purpose of this research was to knowing why in recent years there has been an increase in the number of students who choose to continue their education to a technical vocational high school. The low involvement of women in the field of engineering technology and mathematics caused by a gender gap, the influence of negative stereotypes, culture, and character where the engineering field is more intended for men who are masculine and not by women. The research was conducted by interviewing participants who were randomly selected from female students in vocational high schools. The results showed that the reason of the participant to enter the engineering school because of economic factors with the assumption that graduates from the engineering higher employment opportunities.
Website analysis on industrial work practices in vocational high school
Authors: Firdawati F , Sumarto S , Abdullah A G 
Published: May 2020

Abstract
Industrial work practice is a school program that aims to equip students to apply the knowledge acquired at school to the world of work. To facilitate communication between the school and the industry, an information system in the form of a school web was built. Online systems are the most efficient way of finding information on any topic. The purpose of this study was to determine the existence of school information systems about industrial work practices. Data collection was carried out using content analysis in ten public vocational high schools in Riau Province based on searching dapodik documentation on the school website. The results of this study found a web about school home, profiles, school achievements, data, location, majors, articles and galleries as well as contact links in vocational high schools. So, the conclusion of this research is to provide information that websites about student industrial work practices have not been found from several schools that have been observed.
Digital peer tutoring in engineering education
Authors: Rivaldi D , Megayanti T , Aryanti T 
Published: May 2020

Abstract
The learning process is one of determinant of the quality of student learning outcomes. One of the problems that often occurs in the learning process is inadequate teacher’s teaching strategies, particularly in Engineering Drawing subjects. The teacher tends to be less creative, less variative and trapped in a rigid learning process. These conditions make them less active and feel bored during the learning process. This research aims to know whether there are any differences between the aspects of activeness and psychomotor learning outcomes of the students through the implementation of Peer Tutoring and Learning Together learning methods in the Engineering Drawing subject. The population of this research is the students of class X DPIB in SMKN 5 Bandung while the samples consist of two classes that are selected using purposive sampling technique. The research instruments are observation sheet of student activeness and drawing skills assessment. After implementing Peer Tutoring learning method in class X DPIB 1, the students get 86.81 as the average score in drawing result and they are more active in some indicators such as Drawing activities, Motor activities, Mental activities, and Emotional activities. Meanwhile after implementing Learning Together learning method in class X DPIB 4, the students get 74.23 as the average score in drawing result and they are more active in some indicators such as Visual activities, Oral activities, listening activities, and Writing activities. This research data is analyzed by statistics Independent T-test. The analysis results show that there are differences between the aspects of activeness and psychomotor learning outcomes of the students who use Peer Tutoring learning method and the students who use Learning Together learning method in the Engineering Drawing subjects.
The measurement of specific life skill based on National Qualification Competency Certification Scheme in the field of Building Construction Drawing
Authors: Silma S P , Widaningsih L , Ardiansyah A 
Published: May 2020

Abstract
This paper aims to measure specific life skill of students attending Building Modelling Design and Building Information program (DPIB) based on the National Qualification Competency Certification Scheme in the field of Building Construction Drawing. This research utilized descriptive quantitative method. The sampling was drawn from eleventh grade students of Vocational High School 1 Cilaku Cianjur using purposive sampling method. The measurement criteria are adjusted with competence test requirement referring to standards set by National Board of Professional Certification (BNSP). Data collection process was done by using competence test simulation. The findings of this research indicate that: (1) the specific life skill level was classified as fair, as indicated by the achievement percentage of 80%. The site drawing was the component with the highest level of achievement between three components (site, section and elevation drawing); (2) the work readiness level was classified as good, as indicated by the achievement percentage of 82%. The highest level of measurement was in the flexibility and self-view. The high level of students’ specific life skill in accordance to the national competence standard indicates that students have met the competence standard needed by the world of work. They are competent to be drafters in building construction drawing field of expertise. However, further study is needed to examine the mismatch between the supply of workers with such competence and the availability of employment in the building construction’s world of work.
Profile of misconception in particulate level of acid basic subjects
Authors: Susilaningsih E , Nuswowati M , Natasukma M M 
Published: May 2020

Abstract
The misconception is a mistake in building conceptions based on accepted theory. Undetected misconceptions can prevent students from understanding concepts at the next level. This study aimed to determine the profile of misconceptions experienced by the participants did at level particulate on acid-base material. Students’ misconceptions are detected by using the three-tier multiple-choice test and interview questions. This type of research is quantitative descriptive with the subjects trying 230 students of science class grade 2. The study was conducted at SMA Pangudi Luhur Don Bosko Semarang, SMA Negeri 1 Ungaran, and SMA Negeri 2 Demak. The results showed the general misconception in the acid-base material is 40% in SMA Negeri 1 Ungaran, 43% in SMA Negeri 2 Demak, and 43% in SMA Pangudi Luhur Don Bosko Semarang. Positive misconceptions in SMA Negeri 1 Ungaran, SMA Negeri 2 Demak, and SMA Pangudi Luhur Don Bosko Semarang are respectively 10%, 8%, and 12%. Negative misconceptions in SMA Negeri 1 Ungaran, SMA Negeri 2 Demak, and SMA Pangudi Luhur Don Bosko Semarang are respectively 9%, 2%, and 6%. High-level misconceptions in SMA Negeri 1 Ungaran, SMA Negeri 2 Demak, and SMA Pangudi Luhur Don Bosko Semarang are respectively 24%, 30%, and 25%. The misconception profile of students at the particulate level in Acid-base learning in SMA Negeri 1 Ungaran, SMA Negeri 2 Demak, and SMA Pangudi Luhur Don Bosko Semarang were 39%, 48%, and 56% respectively. Based on the results of the analysis of research data it can be concluded that there are misconceptions about acid-base strength, the concept of pH, and the calculation of pH. This is because the item uses levels of evaluation and analysis at the particulate level.
Student learning motivation on Actionbound application implementation in construction and building utilities subject
Authors: Rosdiana A F , Busono R R T , Yosita L 
Published: May 2020

Abstract
The research aimed to determine the students’ learning motivations on Actionbound application implementation as learning media in construction and building utilities subject. This research was grounded by monotonous and boring learning media, so the researcher tried to innovate the learning media used Actionbound application to make students more interested to take class. This research was conducted by 30 second grade students of modelling design and building information program in SMKN 2 Garut, with Research and Development as research method. The data collection was carried out by media assessment sheets, learning motivations questionnaires, and student response questionnaires. Media assessed by expert judgement was considered very suitable to use. The students’ media responses considered by media content, media language, strategy effect, and media visual had very good responses. The self-efficacy, active learning strategies, learning value, performance goal, achievement goal, learning environment stimulation, as learning motivation aspects showed a “high” category value. Therefore, the developed Actionbound application is suitable for use as learning media in construction and building utilities subject in SMKN 2 Garut.
Analysis of entrepreneurial interest in Dumai Agricultural Vocational students
Authors: Nugroho S B , Sumarto S , Abdullah A G 
Published: May 2020

Abstract
Vocational education should be projected to support student’s skill that can be impact to the student’s readiness to work. As well the vocational education prepares student to be a professional worker, it also should be able to prepare graduates become entrepreneur. The students’ interest in entrepreneurship can be in the form of interests, desires, pleasures, willingness to do entrepreneurship to achieve prosperity as they wish. The graduates of Vocational High School can consider to develop entrepreneurship as their choice of future career. The purpose of this research is to observe the entrepreneurship interest of Agricultural Vocational High School Student. In accordance with the research purpose, so the researcher uses qualitative research through descriptive method. The source data used are informants through interview as technical of colleting the data. The results showed that most of the students of Agricultural Vocational High School have interest and strong foundation to developed entrepreneurship. The conclusions resulting from this research is almost all the student at the grade XII majoring Agro Industry have interest to be an entrepreneur.
The perceptions of automotive industrial managers about the internship students’ competencies
Authors: Saputra J , Abdullah A G , Sumarto  
Published: May 2020

Abstract
The purpose of this research was to describe the perceptions of automotive industrial managers about the competencies of internship student. The population of this research was the 25 automotive industrial that cooperate with one of the Vocational High School in Pekanbaru Riau. The Total Sampling Technique was used to determine the Population for this research, which makes all of the automotive industrial in Pekanbaru Riau was the sample. The respondents were 25 Automotive Industrial Managers. The data were collected through questionnaire. The Data Analysis Technique was Descriptive Quantitative Analysis Technique. The result of this research shown that there were half of the managers’ have good even very good perception for the Internship students. In their perspectives, the internship students have the ability needed by the automotive industrial. Yet, there were few managers who have bad perspective for internship students. This research was meant to be input or suggestions for the school stakeholder to increase the students competencies that needed by the automotive industrial.
Designing an adjustable height engine stand to reduce the risk of student’s Musculoskeletal Disorders (MSDs) in engine tune up practice
Authors: Noor R A M , Barliana M S , Soemarto S , Kuntadi I 
Published: May 2020

Abstract
This study aims to determine the description of a student’s posture when practicing and make an engine stand according to the size or results of previous ergonomics analysis. The source of ergonomics risk is the design of practical tools that are less compatible with varied student postures. The ergonomics research method used is the Rapid Upper Limb Assessment (RULA). The participants of this research were automotive students of the mechanical engineering education department totaling 27 people, the reason for doing this research was because of the results of the Nordic Body Map (NBM) survey, almost all students who practiced on the Gasoline engine course complained of pain in the back, neck and arms. Therefore, an analysis of the level of ergonomics risk results is recommended to improve student work positions. Based on these recommendations, an adjustable height engine stand was designed and made. This research was conducted by beginning with a structured observation of student anthropometry, to provide design recommendations that can be accommodated by all student body postures. The results of the measurement of ergonomic risk level before using the adjustable height engine stand position of the student’s body bent, neck bending, repeating for a long time, the results of RULA anthropometric analysis of the 5th percentile are 4, while the percentiles 50 and 95 are 6, which means that the position has a high level of ergonomic risk and action needs to be taken immediately to reduce risk. The level of ergonomics risk after using the adjustable height engine stand is 2, which means safe. Another result is the creation of an adjustable height engine stand whose height can adjust to the student’s body posture.