bluuebunny/crossref_metadata_2025_split huggingface dataset:
Off-grid solar power plant for refrigeration system: A case study in Bandung, Indonesia
Authors: Setyawan A , Sutandi T 
Published: May 2020

Abstract
The tropical climate in Indonesia promises the availability of solar energy year-round. However, the utilization is very limited. This paper discuses an experimental investigation on the use of solar energy for supplying a refrigeration machine using an AC mini freezer with power input of 85 W supplied by 200 Watt-peak solar panel. The experiment was carried out in Bandung, Indonesia, and showed that the average energy density of solar radiation is 445 W/m2 while the average output of the panel is 106.4 Watts. The daily average energy supplied to the battery is 1182 Wh, sufficient for continuous operation of the freezer in 13.9 hours. If the machine has an on/off cycle with a usage factor of 56.8%, as in the experiment, the energy could operate the machine within 24.4 hours.
Development of an algorithm code concept to match the diesel engine and turbocharger
Authors: Gifari M M A , Sriyono S , Mubarak I , Noor R A M , Permana T 
Published: May 2020

Abstract
Not all turbochargers can utilize exhaust gases from diesel engines. The turbocharger must match with the diesel engine. Two methods for match between turbocharger and diesel engine are developed by Patil and Stones. The purpose of this research is to develop algorithm code that describe a matching concept between the turbocharger and diesel engine based on the steps taken by Patil and Stones. The algorithm has to decide whether one turbocharger match the engine with using engine specification data and turbocharger performance maps as input. One keyword to match is the mass flow rate, this parameter become consideration whether turbocharger match with diesel engine. The results show that the Patil code concept (algorithm) can make limitation area for the turbocharger, but after entering the performance map of turbocharger, it turned out that the turbocharger criteria entered were in the same place and outside the criteria. The result of Stones concept is the turbocharger performance map can cover the operation engine area.
Terrain genetic unit for spring-based regional development in mountains in Indonesia
Authors: Usman D N , Hirnawan F , Widayati S , Sriyanti S 
Published: May 2020

AbstractThis research was carried out in the Mount Mandalawangi region of West Java Province. The research objective is to explore the potential sources of springs in supporting the development of the region so as to encourage the economic potential of the community. The methodology used was geological mapping, spatial mapping, mapping of socio-economic conditions, mapping of water demand levels, which were evaluated using the Terrain Genetic Unit method. The area around Mount Mandalawangi is a relatively fertile area has ±36 points of springs, the discharge ranges from 0.00003 m3/sec-0.587 ltr/sec. The dominant lithology is the Mandalawangi (Qmm) Mountain consisting of glass tuffs containing pumice, and lava composed of pyroxene andesite to basalt. The results of the study using the Terrain Genetics Unit method there are 3 zones that have the potential to develop springs based on the region, Andesite Plateau, Corrugated Hills of Lapili Volcano and Corrugated Hills of Tuff Breccia Interference. The analysis is that regional development can be planned to the maximum by prioritizing the source of spring with a note that there needs to be an arrangement for the source of existing springs.
Deformability analysis of anisotropic rock
Authors: Wijaksana I K 
Published: May 2020

Abstract
Evaluating anisotropic mechanical properties can helps to predict the behavior of rock materials in analysis, design, and construction, and improves the quality and safety. This research discussed laboratory testing and analytical methods to determine the four values of elastic constants of transversely isotropic slate rock. In this study, a combination of experimental and analytical methods has been used to determine the four elastic constants of transverse isotropic rocks in the laboratory. Analytic calculations were performed to determine the elastic constants of rock material with the assumption of linear, elastic, homogeneous, and transversely isotropic. The strain value was determined at of 50% of peak stress on stress-strain curves. Multilinear regression analysis with least squares estimation method was used in determining the linear equation to get to the four elastic constants of the rock. The results of uniaxial compression tests revealed that for the slate rock, the deformability in the direction that is normal to the plane of transverse isotropy (θ = 85°) is greater than that is parallel to the plane of transverse isotropy (θ = 5°) or, in other words, E1 > E2.
Hydrological monitoring in open PIT mining areas using geodatabase attribute in Geographic Information Systems (GIS)
Authors: Isniarno N F , Aziz G , Iswandaru I 
Published: May 2020

Abstract
In open mining systems, the most important problem in mining production activities is surface water management, where surface water management is an integrated water management activity with the aim of minimizing the negative influence of surface water which consists of mine drainage methods, mine drainage, sediment separation and control. Geographic Information Systems (GIS) can be used for hydrological analysis using spatial data, especially in calculating runoff discharges from surface water. The method used in calculating runoff discharge is in the form of daily rainfall data. This rainfall data can show the influence of the catchment area which is useful for knowing precisely and accurately the runoff water discharge. Geographic Information Systems (GIS) are used to calculate variables in rational formula equations by overlay analysis. Information about digital-based hydrological conditions is very useful as a means of decision making and policies undertaken in monitoring hydrological conditions in open mines. By using a geographic information system (GIS) with a geodatabase attribute, it can be used to view general conditions in a mining area in monitoring hydrological conditions. So it is very appropriate to be used as hydrological monitoring in the mining area in making decisions that are fast, precise and accurate. Apart from that the geodatabase attribute can see the actual conditions of a mining area.
Identification of characteristics of the Kutawaringin Gold Ore Vein, Bandung, Indonesia, based on its alteration level in the bond work index test
Authors: Solihin S , Pramusanto P , Guntoro D 
Published: May 2020

Abstract
The infiltration of hydrothermal solutions through structures that form veinlets with different alteration levels and variations in physical strength, will influence the consumption of grinding energy during processing operations. This research uses a gold ore vein sample from the Kutawaringin area, Bandung Regency. The sample, analyzed in the field by microscopic analysis, was tested in petrography and mineragraphy in the laboratory, so that it was found to be moderate and low alterated. By taking into account the mineral composition, especially the percent of quartz minerals which when tested for Bond Work Index samples of PO and FR codes require greater energy consumption than those of the GL and KA code samples. This condition has an impact on the selection of the type of grinding equipment, if the alteration of gold ore vein is far more than the low alteration, more feasible choices based on the most vein, so it is more energy efficient. Although it results in decreased grinded production per unit time for low alteration types.
Analysis of velocity groundwater in unconfines aquifer zone using infiltration measurement
Authors: Isniarno N F , Amukti R , Nurhasan R , Rahmagustiar A , Prahasta G I 
Published: May 2020

Abstract
The presence of ground water is strongly influenced by the presence of recharge zones. Changes in land use can affect the availability of ground water due to changes in the rate of groundwater flow into the ground. One of the causes of flooding and inundation, this occurs because the reduction in the catchment area is accompanied by a decrease in the infiltration rate coupled with an uneven distribution of rainfall throughout the year, thus triggering inundation problems. In this study by analyzing the value of groundwater flow velocity in the free aquifer zone. The study area has various hydraulic conductivity values with values ranging from 0.69 cm / minute to 0.02 cm / minute. The very high category is in the southern part of the research area with an area of 150 Ha, the high category is in the West, East, South and North research area with an area of 21,355 Ha, and the rather high category is in the northern part with an area of 740 Ha. The study area has various infiltration velocity values ranging from 0.22 cm / minute to 1.41 cm / minute. The fast category is in the South and North parts of the research area with an area of 17,355 Ha, the rather fast category is in the North and West parts of the research area with an area of 4152 Ha. Potential groundwater catchment areas are limited by areas consisting of breccia’s, pasufufaan, or clay tuffs, fast infiltration rates - rather fast, and high hydraulic conductivity - very high. The main groundwater catchment potential zone has an area of 10,417.63 Ha, while the additional groundwater catchment potential zone has an area of 11,673.24 Ha.
Development of data communication trainer with hands-on and remote laboratory hybrid system
Authors: Jayanto N D , Pantjawati A B , Haritman E , Mulyanti B , Nurhidayatulloh N , Pratama L A 
Published: May 2020

Abstract
Data communication is the process of sending data that involves two or more devices connected to the network. This is influenced by several factors, depends on the type of data and data conversion media. The data conversion component can be in the form of RS232, which uses max232 IC as a conversion from TTL to Serial data or vice versa. This tool is a development of a data communication trainer where can see the characteristics of data communication via graphic LCD. Input from the trainer can be in the form of logic sent through the LCD touchscreen and received by the microcontroller. The data input will enter an Arduino, as a control component. The Arduino will process the input data and send it out as signal corresponding to the input data along with the signal characteristics. This tool is also equipped with an IoT system where input data can be put in from the internet network, and the output signal will appear on the page provided. The application of IoT to this tool makes it a hybrid system where can be accessed either directly in the lab, or via the internet.
Remote desktop system in IoT and HTML 5-based virtual laboratory for HMI (Human Machine Interface) practicum and hydraulic simulation
Authors: Jayanto N D , Kustija J 
Published: May 2020

Abstract
A virtual laboratory is a facility that allows access to laboratory equipment from anywhere and anytime while connected to the internet. Remote desktop systems are the basis of the development of a virtual laboratory where users can access hardware connected to the lab computer from anywhere with the agreed time. The virtual laboratory can overcome the problem of the imbalance of the number of tools available in the lab with the number of students who will do the practicum, especially the PLC, HMI, and hydraulic simulation. For accessing the lab computer, this tool uses web-based HTML and VNC (Virtual Network Computing) techniques. On the server computer, the ThinVNC server is installed, and the user, password, and port are set. ThinVNC functions as a tool that makes it easy for users to access the lab because it merely provides a web browser that supports HTML 5 such as chrome, firefox, and edge without having to install any browser plugins and does not need to install RDP, so tablet or smartphone can access the lab. When it is connected, the user can access the available lab equipment and can see the results made because there are cameras that monitor the course of the practicum.
Implementation of Building Information Modelling (BIM) Revit to meet the needs of the construction industry
Authors: Aryanti F N , Busono R R T , Siswoyo S 
Published: May 2020

Abstract
This research aims to know the students’ Revit operating ability on beginner level competency in extracurricular activities, in order to fulfill the needs of the Indonesia construction industry. This research was conducted by 30-second grade students of DPIB Vocational High School 2 Garut. The research method was class action research, conducted in three cycles. In the first cycle, the percentage of students learning achievement in mastering Revit was only reached Architecture 85%, Annotate 57%, and View 43%. In second cycle, students achievement increased to Architecture 90%, Structure 79%, Annotate 58%, Massing & Site 88%, and View 43%. While in the third cycle, the percentage significantly increased to Architecture 90%, Structure 82%, Annotate 87%, Masing & Site 88%, and View 86%. The average score of Revit mastery in the first cycle reached 60 (not competent category). In the second cycle, the result of Revit’s average scores increased to 77 (competent quite category). And in the third cycle, the average score significantly increases to 88 (included competent category). The conclusion of this research showed the Revit implementation on beginner level competency in Vocational High School 2 Garut had fulfilled the needs of the Indonesia construction industry.
Seismic multiattribute for predicting reservoir properties: Case study of globigerina limestone reservoir, Madura Strait
Authors: Prakoso A , Haris A 
Published: May 2020

Abstract
Hydrocarbon exploration requires comprehensive understanding of geological and geophysical properties of subsurface reservoir. Therefore, subsurface rock properties determination, which include total and effective porosity, clay content, and water saturation, is a very important, particularly for reservoir target. In term of spatial coverage, subsurface rock properties are then distributed by using seismic multiattribute, which is performed in two approaches – linear multivariate regression and probabilistic neural network (PNN). Linear multivariate regression seismic multiattribute assumes that the relation of seismic attributes and reservoir property is linear, while probabilistic neural network, seismic multiattribute assumes non-linear relationship. This research employed linear multivariate regression using internal attribute of seismic data to predict several rock properties. Transformation of seismic internal attribute to rock properties was attained by a series of weights derived by least-squares minimization. To estimate the reliability of the derived multiattribute transform, cross validation is used where each well is systematically removed from the training set, and the transform is rederived from the remaining wells. The prediction error for the hidden well is then calculated. The validation error, which is the average error for all hidden wells, is used as a measure of the likely prediction error when the transform is applied to the seismic volume. This method was applied to Globigerina Limestone reservoir in Madura Strait that resulted in good prediction of reservoir properties. Result of this research is used for quantification of remaining lead and prospect in the field area. Furthermore, the predicted subsurface rock properties are used as input to optimize in developing well in the proven fields.
Calculation of neutronic parameter design for MTR reactor core using safety control rods
Authors: Surbakti T , Pinem S , Suparliana L , Yogatama F 
Published: May 2020

Abstract
Indonesia has three research reactors that are old, so it needs to be considered designing new research reactor. This new research reactor uses compact core, MTR type, low enrichment of 235U and a new fuel, U7Mo/Al. The advantage of using this new fuel is that it can be fabricated with high density up to 16 gU/cm3. However, on this research a density of uranium was varied from 4.5 -8.3 gU/cm3. The reactor core comprises 16 fuels and 4 control rods inserted into a 5 x 5 grids. Inside the core there are irradiation facilities comprising 4 holes at the edge and 1 in the middle of the core for radioisotope production. The reactor core is also equipped with 2 safety control rods to increase the safety of the reactor operation for one cycle. This research gets an optimal core configuration with maximum radioisotope production. Analysis was performed by calculating using the WIMSD-5B and Batan-FUEL computer programs. Optimal core design a cycle length of not less than 20 days and the reactor can be operated safely with a power of 50 MW producing a thermal neutron flux greater than 1.0x1015 n /cm2s. The calculation results show that for fuel loading a density of 6.52 gU /cm3 will obtain a thermal neutron flux of 1.03 x1015 n/cm2s. The cycle length can reach 32 days. It meets safety and acceptance criteria; however, it still requires a more negative reactivity of the control rod for safe operation at 50 MW compared to other densities.
Application of animation video to improve student learning outcomes in estimating construction costs
Authors: Rahmatunnida R , Busono R R T , Ardiansyah A 
Published: May 2020

Abstract
This research was conducted to improve student learning outcomes in Estimated Construction Costs at SMK Negeri 2 Garut which is still low. The low student learning outcomes may be caused by the learning process that always used static visual learning media. Thus, in this study dynamic visual application in the form of animated video is considered to be able to provide a more concrete understanding to students when compared to static visuals. The research method used in this study was the R&D method with quantitative approach, one group pretest-posttest pre-experiment. The results showed that the animation video was valid with a validation value of 88.33% by the content expert and 97.92% by the media expert that falls under very valid criteria and could be used without revision. In addition, the response of 6 students during a small-scale trial was 82.41% that falls under very good criteria. In the large-scale trial phase with 30 respondents, the animated videos application get an average score of 80.61% that falls under very good criteria. However, student’ learning outcomes after the implementation of animated videos application have enhanced, which are classified as low criteria. This can be seen from the value of N-Gain produced which is equal to 0.14.
Development of authentic assessment maintenance motorcycle chassis system
Authors: Rusalam N R , Soemarto S , Munnawar W 
Published: May 2020

Abstract
The development of transportation in the 4.0 industry is growing rapidly, especially the development of automotive transportation. One of the developing automotive transportation is a motorcycle. motorcycle has several systems, one system on a motorcycle transportation, namely: the chassis system. The chassis system (frame) on a vehicle is one of the most important components in a vehicle. Simple maintenance can be one of the causes of damage or corrosion of the framework of the chassis system. How to properly care for a motorcycle can be obtained through training or learning. Training and learning can be obtained by attending a vocational school majoring in Motorcycle Business Engineering. The Department of Motorcycle Business Engineering provides learning in various fields of both maintenance and repair. Learning in schools cannot be separated from the grading system so it needs an appropriate grading system. One of the assessments that are suitable for learning the care of the chassis system is authentic assessment. Authentic assessment in schools needs to be developed so that graduates can meet the demands of the business world and the industrial world. Authentic assessment is an assessment of real of cognitive, psychomotor and affective aspects. The development of authentic assessment of the care of the chassis system through stages: the preparation of a grid of questions that are adjusted to competence in the cognitive aspects, the preparation of worksheets and assessment rubrics on the psychomotor aspects.
Analysis of the important role of competency of business enterprises in the industrial work practice in era 4.0
Authors: Marniati M , Wibawa S C 
Published: May 2020

Abstract
Advances in digital technology 4.0 become an opportunity for prospective college graduates as initial capital for entrepreneurship. College students can maximize academic competence and entrepreneurial skills through interaction with various partners during industry practice especially in the field of fashion. one of the technologies that can be utilized in the fashion industry is the use of Computer-Aided Design (CAD). The purpose of this study to determine the important role of fashion entrepreneur competence in industrial work practice in era 4.0. This study uses a quantitative approach, using the T-Test and Explanation Factor Analysis. The findings of this study are (1) industrial work practices in individual business units (boutiques, fashion houses, and fashion designers) are more effective than institutionalized business units (sewing courses, fashion design courses, and confectionary businesses), (2) entrepreneurial education has very high effectiveness in preparing practice by applying information technology to design using Computer-Aided Design (CAD).
Gaps in automotive laboratory facilities in vocational high schools with vocational technology education colleges
Authors: Asniwaty A , Sumarto S , Abdullah A G , Setiawan A 
Published: May 2020

Abstract
The gap in laboratory facilities between tertiary institutions and vocational high schools can hinder the process of learning good practices conducted by teachers and students. The challenge for schools to achieve vocational education goals is to provide adequate laboratory facilities. The purpose of this paper is to first determine the conditions and availability of automotive practice laboratory facilities in vocational high schools and vocational education colleges. Second, knowing the gap between the automotive practice laboratory facilities in vocational high schools and vocational technology education colleges, especially in workshop equipment and special service tools (SST). Data collection was carried out at two public vocational high schools and one public tertiary institution in West Java, using a checklist and interviews with the head of the workshop and head of the vocational high school study program, interviews were also conducted with the head of the automotive college laboratory workshop. This study concludes that the gap in practice laboratory facilities between vocational high schools and vocational technology education colleges can occur in terms of the number and condition of practical tools, while the age of a tool does not affect the practical learning process as long as the tool is still suitable for use.