bluuebunny/crossref_metadata_2025 huggingface dataset:
MiR-219a-2-3p suppresses cell proliferation and promotes apoptosis by targeting MDM2/p53 in pituitary adenomas cells
Authors: Wang Yibiao , Zhao Jiaonong , Zhang Chaocai , Wang Pengcheng , Huang Chuixue , Peng Hao
Published: January 2020

Pituitary adenomas constitute one of the most common intracranial tumors. MicroRNAs play an important role in development and progression of pituitary adenomas. In this study, we showed that miR-219a-2-3p was significantly down-regulated in pituitary adenomas cells. Overexpression of miR-219a-2-3p suppressed the proliferation and promoted apoptosis of pituitary adenomas cells. After bioinformatics analysis, we found that MDM2 was one of the downstream targets of miR-219a-2-3p. Further researches showed that miR-219a-2-3p could reduce the protein level of MDM2 by binding to the 3ʹ-UTR of MDM2 and promoted p53 expression. Then, we overexpressed both miR-219a-2-3p and MDM2 in the same group and found that it could counteract the effect of overexpressing miR-219a-2-3p alone on proliferation and apoptosis of pituitary adenoma cells. Taken together, these results suggested that miR-219a-2-3p regulated the proliferation and apoptosis by targeting MDM2/p53 in pituitary adenomas. Therefore, miR-219a-2-3p may serve as a novel marker and therapeutic target for pituitary adenomas.
The sake yeast YHR032W/ERC1 allele contributes to the regulation of the tetrahydrofolate content in the folate synthetic pathway in sake yeast strains
Authors: Kanai Muneyoshi , Kawata Tomoko , Morimoto Tomoko , Mizunuma Masaki , Watanabe Daisuke , Akao Takeshi , Fujii Tsutomu , Iefuji Haruyuki
Published: January 2020

To elucidate the mechanism underlying tetrahydrofolate (THF) accumulation in sake yeast strains compared with that in laboratory yeast strains, we performed a quantitative trait locus (QTL) analysis. The results revealed that the sake yeast ERC1 allele contributes to an increase in the ratio of THF to the total folate content in sake yeast.
The development of tungsten inert gas welding practical manual for vocational high school
Authors: Marwanto A , Hendrik N , Prasetya T A
Published: January 2020

This study aims to develop a product in the form of a tungsten inert gas (TIG) welding practice manual for Class XII students and find out the level of the eligibility. This research is a type of Research and Development (R&D) research. The stages of this research include problem identification, data collection, product design, design validation, design revision, limited trial, product revision I, large group trial, product revision 2, product ready to use. Data collection techniques are done using a questionnaire. The data obtained were analyzed using quantitative descriptive analysis techniques. The results of this study are in the form of a TIG welding practice manual for class XII students. The feasibility level of the TIG welding practice manual is known through the validation process carried out by 4 expert validators. The feasibility test was conducted on 30 students. The average feasibility value obtained from experts as well as the feasibility test on students was 84.81% and included in the very feasible category.
Visual inspection on shielded metal arc welding products of Asian welding contestants in Yogyakarta province
Authors: Djatmiko R D , Kurniawan D A , Pratiwi H
Published: January 2020

This research aims to determine the quality of 3F blunt connection (T-Joint) and 2G shielded metal arc welding (butt joint) of the welding products of the regional selection contestants of ASEAN Skill Contest-Vocational High School (ASC-VHS) in Yogyakarta province. This study was implemented using a discrete approach. The data in this research were collected using a check list for the quality assessment of welding engineering students through a visual inspection and measuring tool for welding gauge. This research was conducted in the fabrication workshop, Department of Mechanical Engineering, Faculty of Engineering, Yogyakarta State University. The population of this study was all contestants of the 2019 ASEAN Skill Contest (ASC) regional selection in welding in the Yogyakarta Special Region. The results of this research show that the quality of the student competencies is still below The Welding Institute (TWI) standard. The aspect that becomes the weakness of contestants in the implementation of the ASC-VHS regional selection for welding includes a lack of understanding and knowledge in determining the welding requirements especially in identifying the welding code, selecting the current Welding, recognizing the type of metal material, recognizing the type of shielded metal arc welding electrodes, and knowing the function of occupational safety and health. Also, welding defects were found in the welding products.
Implementation of problem based learning to improve student learning achievement in turning machining lesson
Authors: Paryanto  , Hidayat F , Harjanto C T
Published: January 2020

The research aims to describe the application of project based learning (PBL) models to improve learning achievement, and to find an increase in learning achievement. This study uses a quantitative descriptive research approach to the type of classroom action research. The research data were obtained using an observation sheet of student learning activeness and a job grading sheet turning students. The application of PBL uses the model proposed by Carr and Kemmis where each cycle consists of four steps, planning, action, observation, and reflection. The results showed that the increase in student learning was illustrated in the pre cycle 46% (sufficient category) increased to 60.5% (good category) in cycle 1 and again increased to 79.7% (very good category) in cycle 2. Improved learning achievement students with a minimal completeness criteria score of 61% in the pre cycle increased to 75% in cycle 1 and again increased in cycle 2 to 93.8%.
Development of the maintenance and repair module for mechanical engineering education courses
Authors: Ardian A , Irwantoro A R , Sasongko B T
Published: January 2020

This study aims to develop a Dictation of Machine Maintenance and repair that is able to support the learning of the subject of Maintenance and Repair of the Department of Mechanical Engineering Education and determine the feasibility of the Maintenance and Repair Module of the Department of Mechanical Engineering Education. This research is a research and development which refers to the research and development steps of Sugiyono including identification of potential and problems, data collection, product design, design validation, design revisions, product trials, product revisions, trial use, product revisions and mass production. The results of the study show that the dictation of maintenance and machine repair of the Department of Mechanical Engineering Education, Faculty of Engineering, Yogyakarta State University has been developed with reference to the research and development steps of Sugiyono and it is feasible to be used in the Department of Mechanical Engineering Education, Faculty of Engineering, Yogyakarta State University.
The role of work characters on the creation of student technology
Authors: Ngadiyono Y , Sukardi T , Wijanarka B S , Rahdiyanta D
Published: January 2020

Universitas Negeri Yogyakarta has a motto of leading in character education and this is manifested in the goal of creating a superior, creative and innovative learning process and environment that can empower students. In the same vision with those objectives, this study had two purposes; the first was to find the role of a character in the quality of the final product and determinants of work character on product quality. The research used to measure both research factors. A total of 56 diploma students became the sample of this study. The results showed that the character of work contributes to the quality of work of student technology. The research also indicates two aspects that contributed to the quality of the product.
Self-organising system design method to improve creativity and effectiveness of experimental learning
Authors: Susanto M R , Susanto D , Finanda S A , Sudirman A , Mahanani C
Published: January 2020

The learning process in the experimental design of visual communication design is one of the in-depth processes of the design methodology application. The objectives of this study include (1) increasing the effectiveness of self-organising system method to spur the level of creativity; (2) Improving the quality of the experimental learning process technically; and (3) Testing the effectiveness of self-organising system method. This type of research used qualitative research that reflectively describes the findings of factual data regarding the development of the learning process and the effectiveness of the self-organising system in the field. Data collection procedures used the reflection model proposed by Ralph, namely, reflective and intuitive designs. The research results show that (1) learning outcomes can be improved through the process of creativity as a result of experimental learning methods of visual communication design and the application of the self-organising system design method, (2) the quality of experimental learning processes can be improved through the self-organising system design method as an alternative of experimental learning in the visual communication design course, and (3) effectiveness of the strategy can be tested through the self-organising system method that significantly influences the experimental learning process in the visual communication design course.
National student skill competition interest in creative industry entrepreneurship
Authors: Suparmin S , Priyanto S , Setiadi B R
Published: January 2020

Creative industries become a new labour market for graduates of Vocational High School (VHS). Creative industries have many sub-sectors that can be filled by all fields of expertise in VHS. Research is directed at how creative industry business opportunities need to be introduced by all students in Indonesia. An annual event such as the National Student Skills Competition (NSSC) held by the Ministry of Education and Culture is a tool for research objects to photograph the interest of Indonesian children in the creative industries. The study used survey methods with locations in Yogyakarta. The questionnaire contributors were distributed by almost two-thirds of representatives in each province in Indonesia. The results of the survey show that the most popular creative endeavours are culinary. However, the results of our study also revealed that the trend of expectations of many high achieving students in this worksheet wanted to continue their studies rather than work or become entrepreneurs. However, creative industry employment opportunities need to be disseminated massively to all VHSs so that the vocational graduates’ job market will be more comprehensive and encourage to open millions of creative entrepreneurs.
The effect of laboratory knowledge, teaching practice experience, and work motivation on laboratory management
Authors: Mahanani C , Wening S , Susanto M R , Sudirman A
Published: January 2020

The objectives of this research are to describe laboratory knowledge, teaching experience, work motivation and laboratory management, to know the influence of knowledge, teaching experience, and work motivation on the laboratory management either independently or collectively, and to know the contents of the laboratory, teaching experience, and work motivation in terms of the laboratory management organized either independently or collectively. This research is an ex post facto research along with a correlational approach. The population of samples comprised 36 teachers of the Dress Fashion in Yogyakarta City. The results showed a significant influence of the laboratory knowledge on the laboratory management with the f count of 15.597. There was a significant influence of teaching practice experience on the laboratory management with the f count of 5.119; there was a significant influence of work motivation on the laboratory management with the f count of 17.207, and there was a significant influence of laboratory knowledge, practical teaching experience, and work motivation on the laboratory management at the Vocational School teachers of Yogyakarta City with the f count of 10.848, and laboratory knowledge variables, practice teaching experience and work motivation (50.4%) simultaneously influenced the laboratory management.
Speaking ability media implementation in learning teaching on public high school
Authors: Widiyono Y , Rochimansyah  , Jannah W N
Published: January 2020

Javanese language is one of the local wisdom in Javanese society. It has uniqueness where varied language in the communication process. It is included the utterance level which has its own function and role It will influence the student in building character, self-motivation and so on. If the teaching-learning material can be combined with digital media, it will give the student acceleration to comprehend the lesson. The study is for finding out the students’ response to how intensive the implementation of media usage in speaking of a high school student in Purworejo. There are two points-in focus: response and feedback. The points have four indicators; relevancy 86.3%, attention 83%, satisfaction 82.4%, and self-confidence 83.6%. The questioner shows that the students gave positive feedback to the media usage in speaking.
Comparative analysis of edge detection methods on beaker glass
Authors: Amalia A F , Budhi W , Arifin N
Published: January 2020

Digital image processing in the form of edge detection using the Sobel, Robert, Prewitt, Canny, and LoG algorithms, in addition to the binarization algorithm, can determine the edges of an object so that it is expected to improve accuracy. In this study, edge detection analysis will be performed on RGB (Red, Green, Blue) images from image capture using a Digital Single-lens Reflex Camera (DSLR) camera. Image processing of the DLSR image uses algorithm design that is made systematically, structured, and neat so that the results of the program can be strived to run following what is expected.
Developing video for agriculture product processing course in the subject of garlic snack production
Authors: Anggraeni A A , Nurtriyanti D , Rinawati W , Murniati D E
Published: January 2020

The study aims to 1) develop an instructional video of garlic snack production for Agriculture Product Processing course, 2) measure the feasibility of the video. This is a research & development (R & D) study using 4D models (Define, Design, Develop, and Disseminate). The feasibility test was performed by two material experts, one media expert, and 30 students of XI grade in State Vocational High School 1 Cangkringan. The data were collected using 4-point Likert scale questionnaires and analyzed descriptively. The video had a duration of 12 min 9 sec with mp4 format. This video consisted of a) an opening section delivered by the presenter containing the introduction about snack product, main ingredients, and the selection of packaging materials, b) a content section consisting equipment and ingredients preparation, production process, packaging process, and expired date determination, c) a closing section delivered by the presenter containing evaluation and conclusion. The video was uploaded to YouTube channel Boga UNY of https://youtu.be/s04y8VGoTak. The feasibility test results of the video according to the material experts, the media expert, and the students were respectively 94.60%, 98.96%, and 93.85%. It can be concluded that the video is very feasible to be used as a learning media.
The factors influencing digital literacy of vocational high school teachers in Yogyakarta
Authors: Warno K
Published: January 2020

The purpose of this study is to reveal the condition of teachers’ digital literacy and the effect of the achievement motivation towards digital literacy among Tourism vocational teachers in Yogyakarta based on age generation, i.e the generation differences of Baby Boomers, X and Y. This research belongs to ex-post-facto with a quantitative approach. The research subjects were 130 teachers consisting of teachers from state tourism vocational schools in Yogyakarta. The results showed that the majority of digital literacy among tourism vocational teachers can be categorized as medium and the variable of achievement motivation plays a significant influence on digital literacy. Moreover, there was a significant influence from the facilities that were used by the teachers towards their digital literacy. Also, there were differences in teachers’ digital literacy among teachers who were born in the baby boomers generation, X and Y generation. It means that the variable age generation of teachers can improve the digital literacy skills of vocational school teachers in the field of tourism.
Concentration of Exopolysaccharides (EPS) Produced from Fermentation of Hydrolysate Biomass of Tuni Sagoo (Metroxylon sp.) Starch by Lactobacillus plantarum FU-0811 in Semi Pilot Scale using Nanofiltration
Authors: Susilowati A , Aspiyanto  , Maryati Y , Dinoto A
Published: January 2020

Nanofiltration (NF) system is one of the concentration process step to recover exopolysaccharides (EPS) concentrate (retentate) as food aditive (thickener, stabilizer and emultion). Feed was biomass containing EPS as a result of growth of Lactobacillus plantarum FU-0811 culture under 37 °C for 72 hours in semi pilot scale (20 L). Biomass was a growth media containing sagoo sugar as a result of step enzymatic hydrolysis on tuni sagoo (Metroxylon sp.) starch using commercial α–Amylase and Amyloglucosidase (AMG) enzymes and other active compounds. Concentration process was conducted by pump motor frequency of 20 Hz, room temperature, and pressure of 10, 15 and 20 bar for 0, 30, 60, 90 and 120 minutes. Result of experimental work showed that NF system has potential use to concentrate biomass containing higher composition than that permeate. Based on optimum EPS, NF system that results a successfully separation of EPS with rejection of 95.24 % was reached at pressure of 20 bar and 60 minutes to retain EPS in concentrate (retentate) of 2.454 % (dry weight) and freely pass in permeate of 0.0097 % (dry weight) with permeate flux value 37.5 L/m2.hour. In this optimum process condition, NF system was able to increase of EPS in retentate of 56.46 % from prior to process (feed) and after process concentration.
Effect of listening to Quran recitation on workload and driving performance: A car simulator study
Authors: Purnomo H , Setiawan D
Published: January 2020

Both mental overload and mental underload can affect driver performance and lead to traffic accidents. This study examined the effect of Quran recitation, one of the alternative voices often heard during driving, against the mental workload. The frontal lobe EEG, i.e., AF3 and AF4, was used as an indicator of the mental workload. Experiments were carried out in four scenarios, i.e., simple road with Quran recitation, simple road without Quran recitation, complex road with Quran recitation and complex road without Quran recitation. EEGLAB toolbox was used to process raw EEG and to perform statistical parametric test. Paired t-test statistics (p-value 0.05) were applied to compare the scenarios. The statistical test showed that there was statistically significant difference in the alpha and beta wave when the driver was given the Quran recitation both in simple and complex road. An increase in alpha wave was an indication of the increased in focus and relaxation, which can lead to improved driver performance. This finding can be used as an alternative of secondary task that is save for drivers. quality of dried Bilih fish can be determined on the basis of its water and protein content.
Extraction optimization for antioxidant phenolic compounds in black grass jelly (Mesona palustris BL) using response surface methodology
Authors: Hendratama H , Harismah K , Fuadi A M
Published: January 2020

Black grass jelly is a traditional plant that is more widely used as medicine to prevent carcinogenesis, diabetes, and hypertension, to overcome diarhea, because it is antimutanogenetics, stabilizers, and immunomudulators, besides black grass jelly also contains antioxidants. This study examines changes of temperature and solvent ratio toward the composition of phenols, tannins, and flavonoids which are antioxidant constituents. Analysis of phenols and tannins uses folin quality reagents, while analysis of flavonoids uses the spectrophotometer method. The change of temperature and solvent ratio gives effect to change of phenol, tannins, and flavonoids amount. Optimal extraction of phenol, tannin and flavonoids using the response surface methodology (RSM) occur at a temperature range of 94-100°C with a solven ratio of 23-24 ml/g.
Measurement of magnetic fields on electric train
Authors: Nugroho H W , Sudrajat M I , Bakti A N , Yudhistira  , Arjadi R H
Published: January 2020

Electric train is one of the most widely used transportation modes in Indonesia especially Jakarta. In general, all electrical and electronic based equipment when operated will produce electromagnetic fields. At present, the railway system uses electric power, both as to its driving force, as well as a supporting part (light system, air conditioner, etc.), and instead uses very large electric power. So surely the train system produces an electromagnetic field. Electromagnetic fields are a combination of invisible electric and magnetic fields of force. They are generated by natural phenomena, but also by human activities, mainly through the use of electricity. The magnetic field on the train generally occurs in areas close to the source. In this paper, already measured the magnetic field (near field) in the electric train in the frequency range 0.015 kHz up to 1 kHz. The measurement results show that the highest magnetic field is obtained when the train starts up at 333.76 nT. The magnetic field level is small when away from the electrical inverters. The average level of the magnetic field when the train is at its highest is 223.26 nT and during braking there is an increase of 323.93 nT.
Modified fuzzy Delphi to determine the consensus of government facility governance
Authors: Sutapa I N , Wullur M
Published: January 2020

The article discusses the development of governance indicators for work facility policies of local government. These indicators will be used as a policy to ensure that work facilities are durable, cost-effective in procurement and maintenance, are effective in use, and added value for end of use/life. Many researchers previously developed governance indicators with the Fuzzy Delphi method, but there were still gaps, namely the differences in the weight of expertise had not been accommodated in determining the final consensus of the importance of each indicator. In this article, the indicators are developed by expert, by considering the weight of their expertise, using a modified Fuzzy Delphi method. The final results of the study are four dimensions of government work facilities governance with twenty indicators that are important in improving the operational performance of local governments.
Job Safety Analysis in Production Floor of PT BD Based on Semi Quantitative AS/NZS4360 Method
Authors: Widodo I D , Dwinanda N R A
Published: January 2020

Every industry must pay attention to the job safety of each employee by implementing good job safety effort to create a comfortable, healthy and prosperous work environment. It is related to the relationship of labor with work equipment, materials and processes, workplace foundations and ways of doing the work. This research was done in PT BD by implementing Job Safety analysis based on AS / NZS 4360. The analysis indentifies 6 jobs that should be improved, namely, (1) Lifting the core (2) cutting mother core (3) The process of removing the email layer (4) Placing the results of the cutting core to the decoiler (5) Taking the cutting results for semi stacking and (6) Taking cutting results for semi wound. Some recomended actions are proposed such as improving the tool, developing SOP, better controlling procedure and improving operator (training).
Development of Chitosan/TiO2 Nanocomposite for Multifunctional Sunscreen Application
Authors: Petrick J , Ibadurrohman M , Slamet
Published: January 2020

Several problems that often occur on the skin are acne and sunburn due to UV exposure. Acne is caused by the activity of bacteria dwelling on the surface of skin. This study has successfully synthesized several multifunctional cream based on chitosan loading in the chitosan/TiO2 nanocomposite. Multifunctional sunscreen defined by anti-bacterial and sunscreens performance with photocatalytic technology. Multifunctional sunscreen is made by Chitosan/TiO2 nanocomposite as active ingredient. Nanocomposite which has been synthesized is characterized by FT-IR, UV-Vis DRS, and SEM-EDX. To make Multifunctional sunscreen, the nanocomposite chitosan/TiO2 as active ingredient is mixed with water and carboxymethyl cellulose (CMC) as natural emulsifier. The result of testing the disinfection of bacteria Escheria coli by nanocomposite chitosan/TiO2 showed the bacteria can be eliminated up to 99.7% within 2 hours. As sunscreens, creams have the ability to moderate protection under UV rays with SPF values from 21.30 to 22.77.
An Anthropometric Study of Head for Designing Ergonomic Helmet for Acehnese Adults
Authors: Andriani M , Widyanti A , Yassierli  , Pramanda R , Suheri
Published: January 2020

One of the fundamental applications of ergonomics is the use of an anthropometric approach for product design and evaluation. Redesigning ergonomic helmets using anthropometric methods is the aim of the study. In this study, participants consisted of 102 women and 102 men who were involved voluntarily. Based on the preliminary study, we found the following head dimensions considered important for helmet design, including: Head breadth, Menton to top of the head, Diametric menton to back of the head, Nose to top of head, Pronasale to back of head, Face breadth, and Eye to back of head. Anthropometric data are presented in this paper, and proposed helmet size design data is discussed.
A literature review on reducing carbon emission from supply chain system: drivers, barriers, performance indicators, and practices
Authors: Ibrahim M F , Putri M M , Utama D M
Published: January 2020

This study aims to review the literature in reducing carbon emission from supply chain system for the past few years and presenting drivers, barrier, performance indicator, and practice. The issue of reducing carbon emission become frequently discussed since unplanned and irresponsible actions by industries are potential threats to sustainability. Companies are now trying to minimize environmental impacts by integrating environmental concerns into their supply chain operations. In the aim of reducing carbon emissions, the industry is faced with different drivers, barriers, and performance indicator. With a variety of problems faced, the practices taken to reduce carbon emissions are very diverse. Thirty papers were collected from previous studies and linked to discussion points. The result showed that good coordination with various media in the supply chain system would be able to achieve common goals in reducing gas emissions.
Sequential optimization of a water-based polygeneration system in ethylene glycol production
Authors: Prihatin T , Mahadzir S , Mutalib M I Abdul
Published: January 2020

Polygeneration system as one of the promising strategies shows the great potential for natural resource sustainability, particularly water. In this paper, a model of water-based polygeneration system to minimize the freshwater consumption and the wastewater generation is presented. Water usage in a heat and power utility, cooling utility, and chemical production are modelled simultaneously. To demonstrate the applicability of the model, a case study on the synthesis of optimum water-based polygeneration system is developed for an ethylene glycol production. A two-steps optimization method is presented. The first step consists of the synthesis and design of the polygeneration unit in which a superstructure containing three subsystems, i.e. heat and power generations, re-circulating cooling water system, and chemical production is introduced. A mixed integer non linear program (MINLP) model is developed to allow the selection of choices. The second step includes the incorporating of wastewater treatment strategy and a non linear program model is developed. As results, comparing to the simultaneous method in the same case study, this approach gives a better result in a computation efficiency.
Rap-Tourism Method to Assess Tourism Objects Sustainability
Authors: Purwaningsih R , Santoso H , Khasanah U
Published: January 2020

Kampung Pelangi Semarang was originally a slum settlement that became artificial based tourism destination by City Government project. It has a positive impact on the tourist attractiveness of Semarang City. It is necessary to maintain its existence by evaluating the status of tourism object sustainability. The purpose of this research is to assess the sustainability status of tourism destination based on the sustainability index and provide recommendations for improvements based on the most sensitive indicators. Data processing used Rap-tourism method and multidimensional scaling (MDS) approach. This research using ordinal scale 1-5 with samples from stakeholders of the tourism objects. Sustainability status of Kampung Pelangi Semarang is a less sustainable category with sustainability index of 35.29. The index consists of four-dimensional value. The first is environmental dimension which has index 36.58 (less sustainable), the next is economic dimensions 32.40 (less sustainable), socio-cultural dimensions 35.15 (less sustainable) and institutional dimensions 34.65 (less sustainable). Improvement recommendations from each dimension are provide restroom facilities and water installation, training the community on the paper floral skill, organizing fishing festivals, provide information facilities related to mitigation of seasonal changes and risk of disaster threats.
Conceptualizing DFSS an analysis of 107 studies
Authors: Nurcahyanie Y D , Singgih M L , Dewi D S
Published: January 2020

The aims of this study are to capture the current state of Design For Six Sigma (DFSS) and to systematically review literature on practices of DFSS published between 2006 and 2018. The questions are: what is DFSS, the application, the essential ability, and limitations, the main trending topics of DFSS? All these questions are used to guide the search for journal in databases and other sources. Then, all relevant literature was reviewed and analysed. There were 18 topics found to be included in the review. The authors proposed two different issues relevant to DFSS. All these papers were interpreted by tools and techniques, such as the implementations of DFSS, its uses, applications, and how it is linked to other disciplines. Data was collected and clustered by year, topic, and keywords in DFSS to be used in configurations and progress improvement and innovation of DFSS. This review found four definitions of DFSS, eight applications and uses of DFSS, three challenges and obstacles in using DFSS, and two future direction of research of DFSS based on its fast-changing product design.
Impact Modeling of Bio-Textile Composite from Agave and Pineapple Leaf Fibers with Sandwich Structure
Authors: Subagyo A , Amin T M
Published: January 2020

The objective of this research is a comprehensive model is presented to study the deformation and damage to bio-textile composite from agave and pineapple leaves fibers under s mall projectile impacts. The approach dynamically follows the strain wave propagation along each individual yarn away from the impact point. As in previous work the mechanics of wave propagation is formulated in terms of impulse-momentum balance equations, which are solved at each fiber crosser using a finite different technique. Our approach explicitly considers the various projectile characteristics namely; mass, velocity and shape, as well as all fiber properties such as denier, modulus, and tenacity. Even more importantly the model allow to account for s lippage of yarn at crossovers and within the c lamps In previous work, slippage of yarn and fracture processes are described with a kinetic approach, which ex plicitly accounts for their dependence on impact rate. Results of model are in good quantitative agreement with publis h experimental data on s ingle ply and several plies biotextile composite. They also clearly indicate that yarn slippage through clamps often seen experimentally is responsible for some salient features observed in balistic.
Platinum Recovery from Spent CCR Platforming Catalyst with Oxalic Acid and Aqua Regia Leaching
Authors: Yuliusman  , Prawira L P D I , Nafisah A R , Amananti K S , Ayu M P , Isa M
Published: January 2020

In aligning to the rapid industrial development, the needs of catalyst nowadays are increasing. Oil and gas industry is one of the example especially in Continuous Catalytic Cracking Platforming Unit, in which the process produces Pt/Al2O3 catalyst waste approximately 2000-3000 kg/year and contains of 3200 ppm platinum metals. It becomes the reason why organic acid leaching and aqua regia leaching is needed to recover the platinum metals to save cost because its price is very expensive and spent catalyst waste is also considered as hazardous and toxic materials. In this experiment, there are two different methods used to obtain the recovery of platinum metals from spent Pt/Al2O3 catalyst. The methods used are leaching with oxalic acid and leaching with aqua regia. The experiment showed that leaching with aqua regia results in higher leaching efficiency percentage with the number of 19.917%. The result is obtained with operation temperature of 300oC and solid-liquid ratio of 20 g/L
Study on exergy efficiency of active desalination coupled solar collector
Authors: Naibaho Winfrontstein , Ambarita Himsar , Nasution A. Halim , Napitupulu Farel H.
Published: January 2020

In this work, a double slope desalination active with basin size area 1,932 m2 wide with 1 m2 glass surface with two pieces with 3 mm glass thickness and 15° glass slope angle. The water level from the bottom of 20 mm and with solar collectors size area 1m2 wide 500mm2 was tested for 8 days in August 2018 starting at 8:00 to 18:00. The exergy value from the calculation of the highest exergy value on the first day of testing at 12.00 is 225.238 kWh, the highest exergy value at the test of the second day at 17.00 WIB is 52.332 kWh, the highest exergy value at 13.00 WIB is 13.680 kWh, exergy value the highest on the fourth day of testing at 11.00 WIB at 6,734 kWh, the highest exergy value on the fifth day test at 12.00 WIB at 22.218 kWh, the highest exergy value on testing the sixth day at 15.00 WIB at 8.728 kWh, the highest exergy value on testing the seventh day at 17.00 WIB amounting to 8.33 kWh, and the highest exergy value at the test of the eighth day at 15.00 WIB amounting to 6.712 kWh.
FEM analysis of the HAZ temperature by heat source modeling on butt-joint process using msc marc mentat
Authors: Manurung Charles SP , Ambarita Himsar , Manurung Yupiter H.P. , Napitupulu Farel , Napitupulu Richard AM
Published: January 2020

This paper uses the Finite Element Method software to simulate the welding method, namely MSC Marc. The selected material is structural steel type C15 categorized as low carbon steel. The material has a thickness of 2 mm and butt-joint welding will be performed, which needs additional attention because welding is highly susceptible to distortion on thin plates. It can be seen that the simulation results against the sample SM 4PL Low have a lower temperature from the heat distribution data taken about 1 mm from the fusion line. Whether or not distortion happens on the plate is significantly affected. This information can be used to predict the real parameter of welding. However, it is better to ensure the best parameters; this data must be calibrated with the results of thermal distribution measurements through experimental methods.
The effect of used lubricating oil volume as a binder on the characteristics of briquettes made from corn cob and coconut shell.
Authors: Napitupulu Richard A. M. , Ginting Sibuk , Naibaho Waldemar , Sihombing Suryadi , Tarigan Nikodemus , Kabutey Abraham
Published: January 2020

The use of agricultural solid waste is one alternative source of energy substitutes, generally made into charcoal briquettes. In making charcoal briquettes, binder is needed to bind charcoal particles. In this study used vehicle lubricating oil was used as an alternative binder. Charcoal briquettes 600 mesh from corn cobs and coconut shell waste are made on the composition of raw materials of 75% corn coke charcoal, 25% coconut shell charcoal with a total weight of 100 grams. In each mixture, SAE 40 used lubricating oil was given with variations of 5 ml, 10 ml and 20 ml. Then each raw material weighing 16 grams was put into a mold measuring 2.2 cm in diameter and 6.33 cm high and pressurized by using a hydraulic press for 15 minutes until the briquette was formed. The results of the study showed that adding 20 ml of used lubricating oil gave the best characteristics of charcoal briquettes.
Experimental study of the prototype of acid gelugur solar dryer (Garcinia atroviridis) with air velocity of 1.5 m/s
Authors: Siagian Parulian , Setyawan Eko Y , Napitupulu Richard A M , Gultom Tumiur , Panjaitan Jusman , Simamora Vidya
Published: January 2020

A prototype of a constant flow type of Solar Gelugur Acid (Garcinia atroviridis) dryer using 2 racks was investigated experimentally. The aim is to explore the performance and characteristics of the prototype. A box of solar acid Gelugur (Garcinia atroviridis) is designed and made. In experiments the thickness of Acid Gelugur consists of 3 mm and 5 mm. The speed of heat flow sourced from the solar collector is 1.5 m/s. Prototype exposed to sunlight located in the city of Medan. The average solar collector temperature is 92.20°C, the drying box temperature averages 33.54°C, Gelugur Acid Moisture average 94.42%, and Ambient Temperature data measured System efficiency is analyzed. The results showed that with a flow velocity of 1.5m/s constant, the percentage of acid content in Acid Gelugur (Garcinia Atroviridis) with a slice thickness of 3mm was greater than that of 5mm with drying for 8 hours.
Simulation model of vertical water wheel performance flow
Authors: Setyawan Eko Yohanes , Djiwo Soeparno , Praswanto Djoko Hari , Suwandono Purbo , Siagian Parulian , Naibaho Waldemar
Published: January 2020

Potential renewable energy source that can be greatly utilized is the water flow, namely hydropower. The hydropower is one of the efforts to answer the energy crisis occurred in several regions due to lack of awareness to develop alternative energy. This effort will be done by designing a hydroelectric power plant. Before being made, it was studied using CFD simulation using Ansys Student Version 19.1 that was calculated based on flow assumptions. One model of the approach used is k-epsilon, with the initial flow rate of 5 m/s. By using water-liquid fluid material, the speed of water produced around the wheel is 2.19 m/s while the speed of water after passing the water wheel is 5.07m/s.
Design and fabrication of multipurpose organic chopper machine
Authors: Sucipto Agung , Kurnia Andryan , Halim Agus , Irawan Agustinus Purna
Published: January 2020

This study aims to design and fabricate multi-purpose organic chopper machine by utilizing local components. Research includes the design of construction, cutting tools and working mechanisms that are in accordance with user needs. The method used in this design is the most optimal component selection, strength analysis using structural analysis software, manufacturing and testing of product prototypes. The result of this study is a multipurpose organic chopper machine prototype with a capacity of 600 kg/h, able to cut organic waste to size ranging from 1 to 50 mm, and can be operated easily by the user. This result is one of the references in the development of the next multifunctional organic garbage counting machine. Keywords: design, multi-purpose organic chopper machine.
Implementation of first come first served in door leaf production scheduling
Authors: Tarigan U , Siregar I , Sari R M
Published: January 2020

In a production activity, optimum results can be obtained if all production activities in a good planning. Good planning can be done to make a scheduling. Scheduling as a decision-making process has an important role in various manufacturing and production systems and information processing environments. In this furniture industry each product goes through a production process with the same machine usage. The stages of processing the product using the same machine related to increase consumer demand and fluctuating indirectly causing accumulation and irregular product lead time. This condition certainly causes delivery delay of products to consumers. Therefore, a scheduling design is needed to minimize the total lead time in order to meet customer demands. The design is carried out using the First Come First Served method where the design was carried out based on the demand of consumer demand received. The results of the study using the FCFS method showsthat the makespan value is 2579,40 hours with the sequence of production product, namely job A-job B-job C-job D-job E-job F. Job sequence based on the demand in which the product first ordered will be done first.
Comparison heat transfer between finn solar water heater pipe and normal solar water heater pipe using cfd
Authors: Perangin-Angin Siwan E. , Ambarita Himsar
Published: January 2020

The development in the world of energy conversion has been progressing especially in the field of applying renewable energy resources related to the Sun. The application is not only in the world of industry but includes the smallest part or household. One application of solar energy resources is solar water heater. Solar water heater is a tool that utilizes heat from the collector to heat water flowing in tubes that are expected to increase the fluid exit temperature. In this study an increase in the efficiency of solar water heater is done by increasing the surface area of the pipe by adding fins on the side of the pipe which are expected to increase the temperature of the fluid out of the pipe that is plain or does not have fins. With the simulation method using CFD software obtained an increase in pipe exit temperature by 0.9%. this shows that in a part of a double-finned pipe, it does not significantly affect the increase in fluid exit temperature.
Application of physical attributes in underground space of MRT station in Jakarta
Authors: Novalia Irma , Herdiansyah Herdis
Published: January 2020

Physical attributes were taken into account when the underground space was built by considering the environmental aspect. Some Mass Rapid Transit (MRT) stations in Jakarta, Indonesia were in underground space with four main areas: transition area, corridor, main hall, and platform. By using a parameter review of architectural aspects in each of area, this study presented that environment-friendly conditions can be created by applying suitable physical attributes. Some aspects have gained from previous research and compared to the design of MRT Station. The result concluded that physical attributes hold important contributions in underground space design. Interconnection design with the aboveground in transition area will maintain humans’ perception when they enter a new underground environment. An artificial window can be simulated by implicating natural wall paintings or photographs. Color, covering system, and additional plants may create positive ambient to overcome negative feelings about a lack of ventilation and access way. some factors have explained previous research relevant to apply in current design which would benefit the future architecture of underground space.
Study of bolon house structure as a traditional Batak Toba house on earthquake force
Authors: Tarigan Johannes , Hutabalian Bandri , Nursyamsi Nursyamsi
Published: January 2020

Traditional Batak house is believed to be earthquake-resistant. Hence, the layout of the structure, the frame concept and also the earthquake force is calculated based on SNI 7973: 2013, namely regulations on design specifications for wood construction and SNI 03-1726-2012 regarding earthquake resistance planning procedures for building and non-building structures, especially the natural frequency ω of house, period T of house, floor displacement and shear forces V that occur. The traditional Batak house building was built long before the SNI 7973: 2013 and SNI 03-1726-2012 regulations existed. The traditional Batak Toba house studied was located in the village of Siallagan “Batu Parsidangan, Huta Siallagan”. According to mechanical properties of wood, the traditional Batak house has fulfilled the wood specifications based on SNI 7973: 2013 and the structural concepts have met the requirements of SNI 03-1726-2012. Calculation or analysis on the resilience of traditional Batak Toba houses against earthquake forces are carried out using software. It is found that the natural frequency ω is 12.697 rad/sec and period of the structure T is0.494 seconds. The shear forcesthat occurs due to the earthquake force V is 28.87 kN, the maximum floordisplacement from the traditional Batak Toba house is taken from the highest point, which is 4.01 cm.
Thermal conductivity of lightweight foamed concrete filled fly ash
Authors: Habsya Chundakus , Diharjo Kuncoro , Setyono Prabang , Satwiko Prasasto
Published: January 2020

Wall is the wider component of high-rise building to exposed the sunshine than roof. The building wall in tropical countries receives the solar heat all day and it makes temperature rise of its room and becomes less comfortable. Therefore, a wall with good thermal insulation is needed for buildings in tropical countries. Lightweight foamed concrete (LFC) can be used as a wall brick substitution as well as thermal insulator. The experimental research about LFC was investigated using FA and foam content to the thermal conductivity of LFC. The investigations were performed through the measurement of thermal conductivity, material density, and observation to the morphology of LFC surface. The LFC samples were varied in volume fraction of foam and FA in mortar. The result shows that the increase in volume fraction of foam in all variations of FA content decreases its thermal conductivity. In contrast, the increase of FA content in LFC results in an increase in thermal conductivity until 45 wt% of FA content, then it decreases as the addition of FA. Thus, the optimum thermal conductivity of the LFC was obtained by FA of 45 wt%. The relationship between thermal conductivity and LFC density shows that any increase in LFC density resulted in an increase in thermal conductivity. Otherwise, any decrease in LFC density resulted in a decrease in thermal conductivity.
The heat treatment of austenisation analysis of medium carbon steel to the hardness, microstructure, and tensile strength
Authors: Budiarto  , Dikki A.H. , Adiman  , Fajar Ochrandhy Danang
Published: January 2020

The research has been carried out on the effect of austenization process on hardness, microstructure, and tensile strength on carbon steel while SAE 1050 and SAE 1552. The aim of the study was to determine the tensile strength and hardness due to austenization process on motor chain components from medium carbon steel SAE 1050 and SAE 1552 The process of austenizing heat treatment at a temperature of 8500C and held for 40 minutes, then quenched into a temperature of 600C oil medium, then tempered at a temperature of 2600C for 60 minutes. The results of the hardness test showed that carbon steel was SAE 1552 experiencing an increase in hardness of 4.25% compared to SAE 1050. The results of SAE1552 medium cyron’s steel tensile strength test were 1781.04 N / mm2 and SAE 1050 1711.43 N / mm2, tensile test results SAE 1552 material is higher than SAE 1050. The results of microstructural observations show the formation of the martensite phase and the remaining austenite phase.