bluuebunny/crossref_metadata_2025_split huggingface dataset:
Biodiesel production over potassium carbon-supported solid-based catalyst
Authors: Nasution F , Husin H , Mahidin M , Nurhazanah N , Pontas K , Koto M R , Ikhsan K 
Published: March 2021

Abstract
Catalytic biodiesel production from vegetable oil and methanol using K2O/C has been studied. The aim of this research was to investigate the performance of a K2O/C catalyst for biodiesel production at varied of K2CO3 loading. The activated carbon-based from rice husk were fabricated via pyrolysis route. The catalyst were formed by depositing active phase K2CO3 (10%; 20%; 30%; 40%; 50%) on the carbon surface for comparative purposes. To better understand of the impregnation effects, particle size, surface topography, and atom composition, the catalysts were analyzed by Scanning Electron Miscroscopy (SEM) and Energy Dispersive X-Ray (EDX). Biodiesel was produced via transesterification reaction. The reaction was carried out during 90 minutes at 65°C using 4wt% of the catalyst and methanol to oil molar ratio 10:1. The highest yield of biodiesel was reached of 96.62% at K2O loading of 50% on carbon-based rice husk. The use of K2O/C as catalysts enhance the purity of the product (carbon-based effect). The characterization of biodiosel, such as viscosity, density, and acid number were evaluated to confirm the purpose of catalyst function. The biodiesel characterization showed in the range with SNI standard.
Bonding performance of CFRP plate and concrete with soft layer system
Authors: Bahsuan R , Hino S , Komori A 
Published: March 2021

Abstract
The use of CFRP (Carbon Fiber Reinforced Polymer) plate to strengthen RC (Reinforced Concrete) structure has become popular, nowadays. Meanwhile, bonding behavior between CFRP plate and concrete is an important issue in application. Many research works had been done to improve the bonding performance of this method. In prior study, it was reported that the bond strength could be increased by increasing the stiffness of CFRP or using a soft adhesive layer with a small shear stiffness. With this assumption, the bond strength will be enhanced by putting a soft layer (polyurea) between CFRP plate and usual adhesive (epoxy). To obtain the complete view of bonding behavior of CFRP plate-concrete, a double face tensile test setup was conducted in this research. Both high modulus type and high tension type of CFRP plate with soft layer and without soft layer were tested. CFRP plate used in this study had a thick of 1mm, 2mm and 4mm, respectively, and had a width of 50mm for all specimens. The results showed that soft layer system has a big influence for high tension type.
Study of Self Compacting Concrete performance with addition of nylon fiber
Authors: Munadrah M , Irmawaty R , Muhiddin A B 
Published: March 2021

Abstract
Self Compacting Concrete (SCC) is a plastic concrete that is easy to flow because of its own weight, fulfils all the desired concrete molds, and has the properties to compose itself. Very suitable applied to conventional concrete construction work that has a large specific gravity and compaction or vibration of concrete is needed. The purpose of compaction itself is to minimize the air trapped in fresh concrete, hence the concrete becomes homogeneous and voids do not occur. To increase the flexural strength of concrete, the addition of nylon fibers can be a solution. Nylon fiber is a material with polymer fibers that have fiber, film and plastic properties. The objective of this study is to evaluate the compressive strength and modulus of elasticity, tensile strength and flexural strength of concrete with the addition of nylon fiber. The percentage of nylon fiber addition of 0.5% and 1% of the weight of cement with a diameter of 0.35 mm and 0.65 mm and a length of 15 mm and 20 mm. With the addition of 1% nylon fiber, compressive strength increases 126% in variation of 0.65 mm diameter and L = 15 mm, tensile strength increases 56.27% in variations diameter of 0.65 mm and a fiber length of 20 mm and flexural strength increases 5.390% in variations a diameter 0.65 mm in the length of 20 mm. The diameter, length and volume of the addition of nylon fibers affect the concrete mechanical behavior. It is proven that the greater the diameter of the nylon and the percentage of the addition of nylon can increase the strength of concrete.
Road engineering with traffic operating facilities at black spot for motorcycle on the road
Authors: Farida I , Kusnawan A A , Mulyana S , Roestaman R , Zafirah A 
Published: March 2021

AbstractTransportation cannot separate from the needs of roads and vehicles. Users of motorists and road accidents are increasing, one of them because it has ignored by road facilities that support blackspots. The purpose of the research is to identify blackspots for motorcycles and determine the completeness of road facilities in traffic operations. The research methods include handling the blackspot location based on the number of accidents using the Accident Equivalent Number method and the weighted method. The results can be five blackspots, namely Ngamplang, Ngamplangsari, Penclut, Cimaragas, Dan Sawahlega. Accident handling at the traffic operation facility by Installing signs and markings that refer to vehicle speed and visibility of vehicle downtime.
Safety cost component development of risk-based standardized work breakdown structure to determine safety cost on road construction project (Case study: At-grade road works)
Authors: Bernessa R A , Latief Y 
Published: March 2021

Abstract
The last five years in Indonesia, the toll road construction project has become one of the most massive developments. However, the number of work accidents has also increased 54.5% of the number of construction accidents came from toll road projects between 2017 and 2019. This results in significant losses such as loss of life, time, and cost. Safety construction is still hampered from the budget side. Many contractors only apply basic occupational health safety and ignore hazard prevention training during construction in order to save costs and increase profits. The aspect that can improve working safety conditions is the availability of a decent budget and specifically allocated for the implementation of occupational health and safety in construction projects. An accurate budget for construction safety costs can be prepared using the Activity-Based Costing (ABC) method. ABC method can provide information on neglected cost items in the construction method. So the safety cost information on road construction projects can be available accurately starting from defining work activities based on Work Breakdown Structure (WBS). The WBS is compiled into a safety plan, after that the safety plan is developed and translated into components of the safety costs needed in construction projects.
The influence of Ground Granulated Blast Furnace Slag (GGBFS) as Portland Composite Cement (PCC) substitution in improving compressive strength of concrete
Authors: Raafidiani R , Sumargo S , Permana R 
Published: March 2021

Abstract
Concrete is a construction material that is extensively used to build various Infrastructures. The increasing of basic human facilities and the resulting Infrastructures in increasing needs of concrete and cement concrete as the material forming. Many problems in the concrete producing industry are not sustainable. Because of concrete production uses enormous natural resources and the main binding material in concrete is cement. Cement is the result of calcination of lime roomates in the process results in the release of carbon dioxide (CO2). To mitigate this problem and for sustainability concrete, many researches have been done to find a replacement for cement. Geopolymer concrete is an alternative to reduce part of cement. Ground Granulated Blast Furnace Slag (GGBFS) that consist of silica and alumina can be used as a binder to replace part of the Portland Composite Cement (PCC). In this study, concrete compressive strength tests were carried out on 48 specimens of concrete cylinder 15x30 cm. The ratio of substitution GGBFS/PCC used were 0/100, 40/60, 50/50 and 60/40. The specimens were cured at room temperature then tested at the age of 7, 14, 21 and 28 days. The results show that the average compressive strength of concrete at the age of 28 days that GGBFS/PCC ratio of 0/100, 40/60, 50/50 and 60/40 were 26.50, 23.01, 26.65 and 22.56 MPa, respectively. Based on the analysis, 50% substitution of GGBFS can be used to partially replace cement because has the same as normal compressive strength of concrete and can be classified as environmentally friendly or green concrete.
Dominant factors from the positive impact of competency certificate ownership
Authors: Widiasanti I , Anisah A , Darussyafa H , Lenggogeni L , Saleh R , Hermawan H , Mulyono T 
Published: March 2021

Abstract
This study aims to determine the perception of skilled construction workers in the craftsman field regarding the positive impact felt after having a work competency certificate. Based on data, there are a number of skilled construction workers in the craftsman who have a work competency certificate which is still very minimal. Even though work competency certificates can have a positive impact on construction workers who have them. In this study carried out with quantitative methods by analyzing the results of perceptions of respondents. This study was conducted at a highrise building project in the city of South Jakarta, namely the Cithaland Tower project, Alamanda Tower, Dharmawangsa Office Tower. The total number of respondents from the 3 projects to be studied is 44 people. The results of this study indicate that respondents feel that the ownership of a work competency certificate has several positive impacts in working in the construction services sector. In this study respondents’ perceptions were measured through four indicators, namely work motivation, work productivity, work ability and competitiveness. Of the four indicators there is one of the most dominant indicators according to respondents, namely the indicator of Work Motivation with a percentage of 26.44%.
Strategy for increasing tender success in Jakarta’s e-tender construction project
Authors: Budianto D , Rarasati A D , Nursin A 
Published: March 2021

Abstract
Electronic tender or e-tendering system in the procurement of goods and services in Indonesia from the perspective of the government is considered to be a tool to realize good governance and public services, because it will increase cost efficiency, effectiveness, faster cycle times, increase package transparency tendered work, provides better public monitoring, promotes fair competition and increases government accountability. However, in the implementation of e-tendering for construction projects, many tenders have failed. This research aims to identify the factors that cause tender failures and develop strategies to increase the success of e-tendering for construction projects in Jakarta. Identification of the factors causing the tender failure was obtained from a literature study and these factors were validated by experts. Questionnaires were distributed to project owners, tender committee, and contractors who have participated in e-tendering system for public construction projects in Jakarta. From the data obtained, statistical analysis using validity test, reliability test, comparative analysis and descriptive statistical analysis used to obtain factors that cause e-tender failures. Proposed strategies for increasing e-tender success for construction projects were obtained from literature studies and expert judgment.
The influence of transactional leadership and soft skill project manager to project success factor in the Indonesia construction industry
Authors: Mufaricha L , Rarasati A D , Soeparto H G 
Published: March 2021

Abstract
The Indonesian government in the next 5 years will focus on infrastructure development and also human resources. The need for construction human resources is huge, considering that infrastructure development, especially for the new National Capital, can be implemented well. In the field of building construction, project implementation requires not only good scheduling, knowledge and technical skills but also human resource management. This is because the project organization involves many stakeholders, one of which is the project team. In large-scale projects with high complexity require project manager skills in leading projects to achieve goals. Leadership is a part of skill competency that is classified as soft skills for project managers. And the transactional leadership style is part of the leadership that is widely applied in Indonesia. Therefore, the authors examine the effect of transactional leadership and soft skills on project managers on the factors that influence project success in Indonesia. This research using questionnaires and addressed to construction companies in Indonesia and processed by SEM (Structural Equation Modelling) - PLS method.
The combination of green construction method and the use of tabas waste as a substitute for cement
Authors: Triswandana I W G E , Armaeni N K , Jawat I W 
Published: March 2021

Abstract
Green construction is a construction process that carries the concept of sustainability where the construction process can reduce environmental degradation by utilizing existing waste in the surrounding environment, contributing to reducing the level of environmental pollution, and being able to reduce waste from the construction itself. The use of tabas as a substitute for cement is one of the implementations of the green construction concept itself, where the waste of rock that produced by the temple stone craftsmen ranges between 20%-30%, which utilization is not optimal, so it often becomes waste that accumulates in the production area so that it can damage the environment due to the compounds of the tabas waste. The use of rock as a substitute for cement both reducing the amount of cement usage which produces 8% CO2 emissions where the percentage is the third-largest in the world even far beyond aircraft fuel. From the results of the study using tabas rock to replace 10% of the volume of cement in the mixture, obtained a concrete strength of 22.21 MPa so that it meets the criteria as normal concrete. With the combination of green construction methods using a combination of tabas concrete and metal deck floor plates, in terms of the cost of making concrete are obtained savings by 20.48% and a reduction in the amount of construction waste originating from formwork by 35.96%.
Study of Fly Ash Plastic (FAPET) as alternative lightweight aggregate in concrete
Authors: Sambowo K A , Apriyanto F , Prihantono P , Sumarsono R A 
Published: March 2021

Abstract
Plastic waste is identified as non-biodegradable material that is harmful to the environment. PET is one of the most well-known types of plastic used for food packaging that usually plastic waste be found in huge amounts. This paper takes advantage of PET plastic waste from the water drinking cup to be blended with fly ash to produce a lightweight aggregate called FAPET. All the properties of FAPET were significantly better than pumice as the control sample during the experiment such as water absorption, compressive strength and abrasion value of 0.5%, 17.4 MPa and 28.55% respectively. FAPET was derived from the double blending process of PET with fly ash with the composition of PET and fly ash was 1:3. The experiment conducted was partial until the full replacement of pumice as a lightweight aggregate with FAPET to establish waste-based lightweight concrete. Modulus of elasticity and compressive strength resulted from 100% replacement using FAPET were 31,706 MPa and 23,64 MPa that equalled to normal concrete strength. The utilization of FAPET is concluded to be successful as an alternative lightweight aggregate for structural use of lightweight concrete.
Changes in spatial patterns and the availability of social facilities in urban settlements due to reactivation of the railroad tracks in Garut
Authors: Susetyaningsih A , Zhafirah A , Cahyana C , Farida I , Nanang N 
Published: March 2021

Abstract
The train is one of the modes of mass transportation that is more effective in overcoming traffic congestion. Apart from its economic benefits, the activation of a long-dead train track has various impacts that cannot be ignored. This study evaluates the impact of reactivation of the Garut railroad on 1) changes in the pattern of spatial settlements along the railroad tracks, 2) identifies the need for lost social facilities on the railroad tracks. Most of the land owned by PT KAI in the city of Garut has experienced changes in land use. Data is collected through surveys and interviews of affected respondents. Reactivation of the railroad tracks caused changes in spatial settlement patterns. Empty land along the railway lines became a magnet for the growth of new settlements, which were then followed by various social infrastructure. There is a constructive relationship between the community and space. Land acquisition along the railroad reactivation track in the Garut sub-district of the city has led to the loss of settlements, markets, community meetinghouses, and basic health service buildings for posyandu. Not all lost social facilities can be rebuilt because of constraints in the provision of land.
Development of prototype e-learning mathematics learning tools using Moodle
Authors: Kamaruddin E , Wijaya Y S , Avianti R A , Rahardjo I A , Sunawar A 
Published: March 2021

Abstract
E-learning is very supporting the implementation of learning, because it uses teaching materials that are independent, so it can be accessed at any time. E-learning can improve students’ absorption of subject matter, active student participation, and the ability and quality of information that when using ordinary devices will be difficult. If carefully designed, e-learning can increase levels of learning interactions. Unlike the case with conventional learning, not all students can ask questions or express their opinions in the discussion, because the opportunities are very limited. Based on these assumptions, it is necessary to conduct a study of the e-learning prototype development strategy. Specifically, the purpose of this study was to develop a prototype of an electronic learning device using Moodle. This research is Research and Development with the Four-D development model. The results of the study were in the form of a prototype e-learning CASE-based Mathematics learning device. In conclusion, the prototype can be developed into a complete mathematics learning media.
Video development for make-up puff pastry
Authors: Pambudi A T , Anggraeni A A 
Published: March 2021

Abstract
Generation Z has a preference for individual learning using information and communication technology. Generation Z prefers digital audio-visual media to verbal media. The study aimed to develop a demonstration video in the subject of make-up puff pastry for Pastry and Bakery course and assess the video feasibility. This study was a research & development (R & D) approach using 4D (define, design, develop, and disseminate) models. Problem, student, and curriculum analysis was performed in the define stage. Video scriptwriting and the production team selection were performed in the design stage. Develop stage consisted of video shooting, video editing, video revision, and assessment. The shooting was accomplished using Sony A6000 16-50 mm camera, Bestluck New Pro F600 lighting with ellipsoidal reflector, Libec 650EX tripod, and Zhiyun Crane V2 stabilizer. Voice was recorded using Boya Clip-on wireless microphone. The audio was edited using Adobe Audition 2017 and the video was compiled using Adobe Premiere pro CC 2017. In the disseminate stage, the video was uploaded to YouTube channel Boga UNY. Based on the feasibility assessment by 2 material experts, a media expert, and 31 potential users, the video was considered very feasible as learning media.
Developing learning video of making mango sorbet for agriculture product processing course
Authors: Anggraeni A A , Setiawan W A A 
Published: March 2021

Abstract
Generation Z uses technology frequently and demands learning that is individualized, engaging, digital, and visually based. They prefer learning videos to learn about the product making process. The research objectives were to develop the video of making mango sorbet for the Agriculture Product Processing course and evaluate the feasibility of the video. This was a research & development (R&D) study using 4D models (Define, Design, Develop, and Disseminate). The video was captured using Sony NX100 camera and Kino Flo 6-bank lighting. The presenter and voice-over dubber’s sound were recorded using Boya BY WM8 wireless microphone. The video was edited by Adobe Premiere Pro CC 2017. The video had a duration of 14 minutes 29 seconds with mp4 format. The video consisted of the opening section, the content section, and the closing section. The opening and closing section were delivered by the presenter. The content section was demonstrated by an actress and voice-over dubber. The video feasibility was evaluated by 2 material experts, a media expert, and 30 students of Vocational High School (VHS) 1 Cangkringan. The data were analysed descriptively. According to the feasibility evaluation, the making mango sorbet video was considered to be very feasible to be utilized as a learning media.
Implementation of Moodle e-learning in Mathematics
Authors: Kamaruddin E , Sulaeman E , Nurita L , Ningtyas L D 
Published: March 2021

Abstract
The rapid development of science and technology provides opportunities for computer experts to create attractive, interactive application programs. As the 2013 curriculum takes effect on the characteristics of student-centered learning, various electronic learning media have developed to improve the quality of education. One of the interactive media produced is e-learning based on Moodle for Mathematics. Moodle is a learning management system that is designed using web-based applications and provides online learning services. Moodle is equipped with three main elements in the learning process, there are users like teachers, users as students, and the subject matter. Together Moodle can be designed distance education and a modern and productive learning environment. Moodle can build students’ creativity in doing problem-solving, including in solving mathematical problems. This will create HOTS for students. Based on these assumptions, it is necessary to conduct a study regarding the implementation of Moodle e-learning in Mathematics. The purpose of this study is to apply Moodle e-learning to the material of linear equations. This research is Research and Development. The results showed that Moodle could improve students’ high-level thinking skills in solving mathematical problems. In conclusion, the development of Moodle e-learning can improve mathematics learning outcomes.
The implication of Android-based mobile learning on housekeeping subject
Authors: Hasanah U , Doriza S , Rahmadhani R 
Published: March 2021

Abstract
The purpose of the study was to increase knowledge about the term housekeeping through Android-based learning media for vocational students in the Hospitality Accommodation Department. This type of research is quantitative with a true experiment approach and research design pre-test post-test control group design. This research uses an assessment of expert judgment and a sample size of 15 students for the experimental class and 15 students for the control class. The prerequisite test in this study uses the normality test and the homogeneity test. The calculation results show that the data are typically distributed, homogeneous. Hypothesis testing using the independent t-test, at a significance level of 5% obtained tcount> ttable of 3.759> 1.699, shows that an increase in terms knowledge in the field of housekeeping before using mobile learning media and after using mobile learning media.