bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of leakage on refrigerant distribution in an air conditioned room using propane as working fluid
Authors: Muliawan R , Pasek A D , Lukitobudi A R , Sutandi T 
Published: May 2020

Abstract
Propane R-290 as hydrocarbon refrigerant has more benefits from the aspect of thermophysical properties, but the only weakness from this refrigerant is flammable. The distribution prediction of R-290 leakage to an air-conditioned room. The study using numerical simulation of CFD ANSYS FLUENT V.13. The distribution of R-290 with a leakage rate of 0,001kg/s and an airflow of 0,1m/s will run out after 600s, with 0,002kg/s will run out after 300s and with 0,005kg/s and 0,5m/s will run out after 120s. The mass flow rate can influence the refrigerant distribution of leakage effect flowrate. Airflow can increase the dispersion of refrigerant gas and decrease the level of the refrigerant amount at any certain point in the room after the refrigerant charge is empty. This momentum effect was due to the impact of supply air initial velocity. The buoyancy effect was due to R-290 density is greater than the air makes the refrigerant flows downward, accumulated, and stagnant. Make sure that the contactor relays and other electrical tools have the position, x=0 m ≤ x ≤ 1 m on y=0 m ≤ x ≤ 26 m and then y=1 m, x=0 m ≤ x ≤ 4 m.
The analysis of the calculation of resin requirements in the process of forming carbon fibre body using vacuum infusion method
Authors: Noor R A M , Hernandyansyah F 
Published: May 2020

Abstract
The aim of this research is to know the calculation of resin requirements which is used, the relative velocity of resin and filling time in body construction process of electric prototype vehicle which used carbon fibre material using vacuum infusion method. In making this vehicle body is using carbon fibre in order to have light in weight, strong and safe to fullfil the regulation or rule Shell Eco-Marathon (SEM).This light in weight vehicle is to increase power to weight ratio. So, it can be increase the efficiency of the fuel. The body of this vehicle has been included in Shell Eco-Marathon Asia which held in Singapore 2017. Based on the ideal calculation result resin in electric prototype that used carbon fibre using vacuum infusion method has obtained as much resin value as needed (RC) 3.83535 Kg, the relative velocity of resin (V) 0,005 m2/s, and filling time (t) for about 10,4 minutes and total weight body is 8 Kg.
Design of a new online monitoring system of COP based on Arduino Uno with application to split A/C
Authors: Erham E , Inten R N 
Published: May 2020

Abstract
Air Conditioner(A/C) is a system of air conditioning which serves need of thermal comfort inside a room. Until now, to determine COP of A/C is performed measurement of temperatures and pressures in A/C. Then, it is continued by calculating of COP. Unfortunately, the process take much time. Therefore, it is important to find any new method to obtain COP. In this paper, to solve the problem was designed a COP monitoring system. To do this, the Arduino Uno was uploaded a program of the monitoring system. The system was equipped sensors. And then to display COP was used a Laptop. The results showed that by using the proposed method and the traditional one, it was obtained that COP actual fluctuates about 3.3 in range from 3.14 to 3.51 and 3.2 to 3.5, respectively. In addition, it was predicted that the using of proposed method in illustrated situation can save time by 2 hours or 80%. It can be considered as a promising solution to determine the COP quickly and easily.
Web-based real time air properties display application
Authors: Badarudin A , Pratikto P , Falahuddin M A 
Published: May 2020

Abstract
A point on the psychrometric chart can show 7 properties of air. If two properties are known then 5 other properties can be calculated. Air treatment will change the properties of air conditions. Changes in air condition can be determined by measuring each air properties and plotted on a psychrometric chart. One of the uses of psychrometric analysis is to determine the amount of cooling capacity used in air conditioning systems. To show the condition of the air at any time needed a system that is integrated between the data acquisition device and data display. This research designs and develops applications that are ready to display data and psychrometric charts that can later be integrated with hardware equipped with sensors through an interface. Psychrometric applications are designed using the JavaScript programming language, so they can be opened using any web browser. Psychrometric charts are drawn using iteration calculation methods. Based on the results of data analysis, the difference in value between the results of manual calculations and applications is as follows: wet-bulb temperature (Twb) is 0.27%, Moisture Content (ω) is 0.77%, specific enthalpy (h) is 0.52 %, Specific Volume (v) is 0.28%, Dew-Point Temperature (Tdp) is 0.92%.
High strength lightweight concrete with expandable perlite as the aggregate
Authors: Pramusanto P , Nurrochman A , Mamby H E , Nugraha P 
Published: May 2020

Abstract
Lightweight concrete has been an interest due to its advantages compared to normal concrete. Lightweight concrete can be produced by the use of lightweight aggregates. In this study lightweight concretes were made with the composition of expandable perlite combined natural sand with each volume is 50% and concrete with 100% expandable perlite as the aggregates. The volume of the aggregates was varied from 80% up to 89%. The concretes were measured for their density and tested for the mechanical and absorption properties. As the results, expandable perlite obviously has the effect in reducing the concrete density. Nevertheless, the strength decrease as the expanded perlite aggregate increase. The optimum lightweight concrete that acceptable as the international standard is with the aggregates of expandable perlite combined natural sand having the 50% of each volume with the aggregates composition is 80%.
Groundwater study in Subang Industrial park and its recharge area as a suggestion for establishing recharge and discharge zones of Subang Groundwater Basin
Authors: Ashari Y , Pulungan L , Wijaksana I K , Isniarno N F , Mildan D 
Published: May 2020

Abstract
This research was conducted in Subang Groundwater Basin, West-Java, related to the prohibition of groundwater extraction in the Subang Industrial Park (SIP) area. This is because the area is considered as the Recharge Zone of the groundwater basin. The purpose of this study is to determine whether SIP stands above the Recharge Zone or not, moreover, find out which part of the Basin that supplies groundwater aquifers of SIP. The method used in this study is applied of DRASTIC method using ArcGIS and conducting field research measuring the infiltration rate of soil formations at selected points in the Basin, geologic and hydrogeological mapping of Lakes. The results of this study indicate that the SIP is indeed built on a recharge area, the soil where the SIP is established, has ability to infiltrate rainwater. However, the results of more detailed observations of wellbore logs in this area, it is known that between the groundwater aquifer used in SIP and the infiltration zone of the ground surface is separated by impermeable clay layers. This ensures that there is no relationship between surface water infiltration and groundwater being extracted by factories in the areas. Therefore, it is certain that the recharge area originates from other areas in the Basin. Key words: aquifer, recharge area, Subang Groundwater Basin.
Gold water treatment, waste monitoring, and management with the fitoremediation method
Authors: Pulungan L , Zaenal Z , Ashari Y , Megantara F 
Published: May 2020

Abstract
Gold processing activities along the Ciherang river use Mercury. Monitoring and managing the impact of gold processing activities on the environment by the standard quality of wastewater quality of the Ministry of Environment No.202 Th.2004 concerning Wastewater Quality Standards for Gold and or Copper Ore Processing Activities. Monitoring the quality of wastewater flowing into the river by observing water pH, TDS, and mercury content. Environmental management is carried out by reducing the mercury metal content in wastewater, with the phytoremediation method using Eichhornia Crassipes. Monitoring is carried out at five different locations, wastewater out of gold processing, 2 locations at the settling pond, and 2 locations at the river water. The results showed an increase in mercury content in settling pond 2, 0.525 mg / L, and settling pond 3, 0.00903 mg / L. The environmental management with the Fitoremediation method day 0 Hg levels of 0.06284 mg / L, day 4 Hg levels produced to 0.01203 mg / L, day eight the value of Hg levels 0.114 mg / L, the 12th day the value of the resulting Hg 0.01267 mg / L
Increasing the performance of silica modified quaternary triammine for sorption of Gold(III) Ion
Authors: Ngatijo N , Gusti D R , Bemis R , Fadhilah A H 
Published: May 2020

Abstract
Synthesis Silica Modified Quaternary Ammines (SMQA) and its application has been carried out on the adsorption of gold(III) ions in a batch system. SMQA material is synthesized through the SMA methylation reaction. SMA material is synthesized from Na2SiO3 and 3-Aminopropyltrimethoxysilane (3-APTMS). Furthermore, the replacement of the methyl group in [-N(CH3)3]+ will change to [-N+CH3{(CH2)3N+(CH3)3}2] called Silica Modified Quaternary Triammines (SMQT). SMQT is synthesized by watching SMA with 3-APTMS become SMT which is then refluxed for methylation process to form SMQT. Material characterization is carried out through identification of functional groups, surface morphological analysis, elemental composition and metal ion concentration. Adsorption process of metal anion [AuCl4]- obtained optimum results at pH 5 with a contact time of 100 minutes with an adsorption capacity of 77.58 mg/g and an efficiency value of 96.975%.
Development of Internet of Things (IoT) based learning media in efforts to improve student skills at the industrial revolution era 4.0
Authors: Kustija J , Hakim D L , Hasbullah H 
Published: May 2020

Abstract
Practicum is an essential component in the learning process at universities, especially in the fields of science and technology. Realizing quality practicum requires a balanced amount of equipment that supports the process, but practicum participants often exceed practicum equipment. The solution is to create a remote laboratory that can be accessed from anywhere while connected to the internet. The remote laboratory consists of three essential parts, namely a server that includes a computer or laptop connected to the data processor sent by the user and then connected to the actuator, a server is also connected to the camera that the user can observe the practical work. The second part is an internet connection, and the third part is the user. All that is controlled by ThinVNC software, Ngrok, and GUI that has been provided. On the server computer, GUI, ThinVNC, and Ngrok are installed as controllers for the practical work, while the user can open the website to access the lab computer. Based on theory and experience, this technique is very suitable if used in PLC and pneumatic practicum. The use of remote labs makes students more skilled in facing the era of the industrial revolution 4.0.
Puzzle game development as a learning media in learning outcomes of building construction basics
Authors: Abdulah T , Widaningsih L , Minggra R 
Published: May 2020

Abstract
The use of learning media in Building Construction Basics subject at SMKN 1 Sumedang were still not varied, it caused student learning outcomes to be not optimal. The researcher made alternative learning media that could encourage students’ interest in the learning process. This research was aimed to design, find out, and implement learning media in the Basic Competence of Brick Installation Procedures. Learning media designed was puzzle as educational game with problem solving work technique and memory reinforcement. The research and development method were employed in developing the learning media. A purposive sampling technique was conveyed in order to collect the data with the participants of this research were 31 tenth grade students in DPIB 3 class of SMKN 1 Sumedang. This research showed that learning media were suitable to use after being validated by media experts and material experts. The students were more enthusiastic and respond positively to the use of learning media with puzzle games because it could help them to learn independently. The student learning outcomes showed the improvement both before and after using this learning media. Thus, the use of puzzle as a learning media were in the good and suitable category as an alternative media that could help the learning process and the students were able to use the puzzle well in the Basics of Building Construction subject at SMKN 1 Sumedang.
The assessment instrument product of macrame technique in textile craft course
Authors: Marlina M 
Published: May 2020

Abstract
The assessment instrument product of macrame technique in textile craft courses is an instrument that is arranged systematically to determine product accuracy based on established criteria and indicators. The purpose of this study was to make a assessment instrument for evaluating macrame technique products in textile craft courses that can be used as a reference by educators in assessing student work in the form products of macrame technique. Quantitative research methods with research and development (R&D) models through preliminary study stages, the design products of macrame technique, production and manufacturing of macrame product valuation tools, validation, revision, and analysis. The results of the validation stage products of macrame technique valuation the assessment instrument show that the “Very Eligible” is used, judging by the evaluation given by the evaluation experts and material experts with an average percentage given of 100% of the evaluation experts and 98, 21% of material experts include six indicators, namely types of macrame motifs, function of macrame products, design elements, design principles, use of materials, and completion techniques. The assessment instrument product of macrame technique that have been made can be used as a reference in assessing student work in the form product of macrame technique.
Feasibility and prospective analysis of logistics engineering study program as the demands of the digital business era
Authors: Masri R M , Purwaamijaya I M , Purwaamijaya B M 
Published: May 2020

Abstract
The rapid development of information and communication technology will deliver the public to the changing era, including in the business industry. The global community is currently in a transition towards digital society which is characterized by intensive use of science, technology and humanities, integrated infrastructure that demands human resources to be able to creative and innovative in order to face the demands in the digital business era. The existence of these changes affect global trends in logistics business practices in the industry, including by the movement towards free markets and regional cooperation to expand markets. Market expectations also change as global competition in products and services pushes for higher standards, lower costs and increasingly diverse choices of customers in the market. Research is needed with a comprehensive qualitative approach, mechanism, and exploration of needs to be anticipated by university to become a center of excellence and contribute to the real world by producing human resources that have strong character and integrity accompanied by the ability to innovate and utilize their digital knowledge to be able to work and win competitions in the global business industry, both as practitioners and academics, one of them is by opening a logistics engineering study program by focusing on e-logistics that suits market needs.
Ionic liquids in chemistry teacher education: An interactive simulation on their fundamental structure-property relationships
Authors: Mudzakir A , Liliasari L , Hernani H , Widhiyanti T , Sarifudin A 
Published: May 2020

Abstract
This research was conducted to reconstruct the activities of technochemistry education through interactive simulations of the relationship between structure of ionic liquids with their physico-chemical properties. This simulation was constructed to enhance the chemistry teacher students’ ability of the view of the nature of science and technology (VNoST). Ionic liquids were chosen as a technochemistry model because in this materials; the structure, properties and their performance can be connected to one another easily and attractively. By engineering its cation and anion structure, the properties of ionic liquids can be adjusted (tailored-made materials) to the needs of the engineer. Technochemistry education views education from the perspective of engineers and scientists who work not only on inquiry, but also on the perspective of engineering and design. The research was conducted to overcome the problem of the low performance of Indonesian students’ scientific literacy as revealed in the PISA (Program for International Student Assessment) study from 2000-2015. The weak performance of scientific literacy of students can be caused by weak understanding of the teacher of the nature of science and technology or View of Nature of Science and Technology (VNoST), a core component of scientific literacy. Reconstruction of technochemistry education activities carried out is directed to produce interactive simulation software for the engineering of ionic liquids structures. The method used in this research is Research and Development (R&D) through the Model of Educational Reconstruction (MER). The first stage is analyzing, clarifying, and reconstructing the structure of scientific content (scientific explanation) into a content structure suitable for learning (pedagogical explanation). The next stage of analysis studies related to students’ pre-conceptions on the reconstructed topic. In the final stage, the teaching-learning process is implemented using the software produced and reflects the results of the implementation for the improvement process through a quasi-experimental study. Based on the results of the implementation, this interactive simulation has the potential to enhance students’ VNoST abilities. This is indicated by the more students who have the Realist category in six of the eight questions on the existing VNOST aspects.
Digitizing Project-Based Learning in engineering education
Authors: Latifah L , Maknun J , Mardiana R 
Published: May 2020

Abstract
Students tend to be not explorative in solving their assignment. Improper learning system is one of several factors that probably be the cause of this problem. This research aims to analyze students’ problem solving abilities through the implementation of Project-Based Learning (PjBL) on Construction and Building Utilities subject. The research design is Quasi-Experimental Design with the type of Two-Group Posttest Only research. The population of this research is the students of XI DPIB in SMKN 9 Garut 2018/2019. The experimental class students use PjBL while the control class students use expository learning. Data analysis is obtained from students’ problem solving abilities test and observation results. The students’ problem solving abilities scores are calculated based on four steps of Polya’s problem solving theory, first is understanding the problem, second is planning how to solve the problem, third is calculating, and fourth is checking the result. The analysis result shows that the experimental class students have better problem solving abilities than the control class students. In addition, the experimental class students are more active and communicative in the class. According to problem solving ability test and observation results, PjBL is quite effective to be implemented on Construction and Building Utilities subject.
Design computer laboratory friendly for disabilities
Authors: Sukriman S , Sumarto S , Abdullah A G 
Published: May 2020

Abstract
The purpose of this study is as a preliminary study to determine the availability of computer laboratory facilities and computer laboratory designs available at vocational high schools whether they have understood the students with physical disabilities, then from the findings obtained will be made a computer laboratory building design that is friendly to students people with disabilities. Data collection uses observation and semi-structured interviews. The researcher interviewed several teachers in vocational high schools to explore information about the availability of facilities and supporting infrastructure in schools for people with physical disabilities especially in computer laboratories. The researcher also interviewed two special school teachers to explore information about the needs of facilities and infrastructure for people with physical disabilities, their experiences while observing and doing activities with students with disabilities. The results of this study indicate the unavailability of friendly infrastructure facilities for people with disabilities, especially computer laboratories in vocational high schools, also found several barriers and expectations about the future design of computer laboratories. The conclusion from this study recommends that schools make improvements and additions to facilities that support students with disabilities, especially those who have physical disabilities, so that they can carry out activities like normal students when accessing facilities and infrastructure at school.
The utilization of remote sensing technology
Authors: Yavis D , Widiaty I 
Published: May 2020

Abstract
Remote Sensing was introduced at the vocational school of Geomatics Engineering in 2013. Remote sensing is the science and technology relating to search information about an object without direct contact with the object. The purpose of this paper is to review research related to remote sensing in the last 5 years. Search results show that the scope of remote sensing topics includes (1) Environmental monitoring such as mapping mangrove forest carbon stocks, detection and monitoring of vegetation affected by oil spills (2) Interpreting land cover and change for paddy modeling, road detection and settlement quality (3) Mitigation and monitoring of natural disasters; Forest fire, Mapping flood areas and affected flooding (4) Identification of natural resources; copper mining, mapping ground water prospective (5) Plant identification; determination of species, identification of agricultural crops, etc. The images used are Landsat imagery, AQUA / TERRA, and others. The obstacle in this research is the storage of data that has a large volume. By reviewing the aspects studied there is a cheaper and more efficient way to improve the quality of objects. The conclusion from the search results is this review will be able to enrich the treasures of knowledge in remote sensing technology learning in Geomatics Engineering, especially with related to enrich learning content.