bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and Development of Stirring Tool Pin Profile for Reconfigured Milling Machine to Perform Friction Stir Welding Process
Authors: Budin S , Maideen N C , Sahudin S 
Published: July 2019

Abstract
Three customized stirring tool pin profiles have been designed which are (1) straight cylinder, (2) triangle shape, and (3) tapered shape to be used by reconfigured milling machine (Cheng Yin – CY-GH 260) to perform friction stir welding process. Shoulder geometry is constant for all tools (20 mm having 8 deg concave and length of the pin from shoulder is 2.7 mm). Then, all the tools were fabricated and tested by joining two similar plates of Al 6061 and Al 7075. The tools are made of H13 steel (chromium-molybdenum). Welding parameter used are 1270 RPM for rotating speed and 218 mm/min for welding speed. The samples produced were evaluated based on physical appearance of weldment, tensile strength value, surface roughness value, and physical tool wear. From the result, all the designed and fabricated tool pin profiles were able to perform FSW successfully using reconfigured milling machine. Tapered tool produced the highest tensile strength with 134.95 MPa. However, straight cylinder tool produced smoothest surface roughness with 1.850 μm which provide better surface finish. Weldability of Al 6061 is better compared to Al 7075.
Contact Phenomena in Micromachining: Modelling and Simulation
Authors: Siregar Ikhsan , Saedon J.B. , Adenan Mohd Shahriman , Nor Norhafiez Mohd , Pazai N.M.Izzat M. 
Published: July 2019

Abstract
The chip development process is an active procedure that is frequently nonlinear. A chip resolve not arrangement once the cutting penetration is a smaller amount than the smallest chip width available. This research shows a series of simulation results that work with finite element methods in a sophisticated radius conclusion on micromachining. A prototypical is industrialised by considering a method, this method is arbitrary Lagrangian - Eulerian (ALE). Popular this study analyzed and simulated chip development, chip progress and the mechanism of material distortion that occurs throughout micromachining AISI D2.
Design, Develop and Simulate Microdrilling Cutting Tool
Authors: Siregar Ikhsan , Saedon J.B. , Adenan Mohd Shahriman , Azmi Muhammad Firdaus Mohammed , Harun Anis Fatihah Binti 
Published: July 2019

Abstract
Microdrilling has an important role in the world of modern industry, especially in terms of miniaturizing existing products or components. Through this research explain the design, development of design and simulate microdrilling cutting tools. By using four geometries that are different from the previous model of micro drilling tools, a development, modeling and simulation were carried out and analyzed using Finite Element Analysis (FEA) using ABAQUS Software. Titanium alloys (Ti6Al4V) and tungsten carbide (WC) materials were chosen as one of the materials for the workpiece and cutting tools respectively. Microdrilling device is a constant variable, as for the amount of flutes and point angles is an independent variable. Cutting force, cutting temperature and Von Voltage misses from the micro model are analyzed from the simulation results based on these independent variables. After observing it turns out that fewer flutes will cause a high value to cut the temperature, cut the strength and also Von Mises.
Confusion around e-ID Card Service, Public Obligation versus Public Service
Authors: Kania I , Alamanda D T , Anggadwita G , Permatasari A , Hasyim S B 
Published: July 2019

Abstract
The issues of public services are complained by most people, one of them is the population problem. E-ID card as the identity of the population is the biggest public complaint reported to the State institution in charge of overseeing public services. Unavailability of the blanks, the uncertainty of the information and the non-proactive nature in providing services are the most common issues in the public complaints box for e-ID cards. This study aims to find out public opinion concerning e-ID card recording service. The method used by the researchers is descriptive survey in which the data were collected through observation, interview and questionnaire distribution. The sample in this study 578 respondents. Simple linear regression is used as a tool to measure the level of public satisfaction based on the services provided to them when signing up for e-ID cards. The result shows work culture influence the service quality by 0,35. The benefits of this research could have an impact on the policy of Garut regency government, especially in assessing the government performance in e-ID card recording service comprehensively.
Information Retrieval Optimization Based on Tree of Social Network
Authors: Nasution M K M 
Published: July 2019

Abstract
Information source such as the Web is a representation of social activities. Social activities create social structures that can be explored through social network concepts. Social networks not only show the structure of a social community, but prove the existence of its members and community. In that context, within the source of information, evidence of a community can be accessed through a collection of documents whose existence continues to increase, whereby the measurements can be performed using recall and precision. However, the recall and the precision as part of the measurement of information retrieval also requires technology to retrieve the related documents, an information retrieval based on network concepts. To solve it is proposed the concept of a collection of stars from trees and the degree of social actors in social networks, and produced a formula about the measurement of recall and precision with better results.
Effects of brand, tariff, network on customer preference in telecommunication.
Authors: Nasution H , Ginting L , Hidayati J 
Published: July 2019

Abstract
There are many service providers that offer telecommunication services. To win the competition, service providers must know their customer. Customer chose service provider’ products based on their preference. In this paper, discussed about effects of brand, tariff, and network to consumer while choose telecommunication service provider. This research was conducted by survey in Medan City by using sample 331 of prepaid customer. The paper show network is the highest corelation score. Network and brand have significant relation to customer preferences. To gain market share, service provider must maintain their network.
The experimental and simulation study of an earth-air heat exchanger in Medan city
Authors: Manik T U H S G , Sitorus T B , Panjaitan M L , Saragih Y O 
Published: July 2019

Abstract
The earth-air heat exchanger (EAHE) is an air-conditioning device utilizing a heat exchange between the air in the room and the soil. This paper purpose to determine the EAHE performance with experimentally and simulation. The simulation used are transient CFD, turbulent and 3-dimensional. The ambient air was distributed to the pipes with the different velocity of 2 m/s and 3 m/s. It was found that the earth-air heating exchanger effectiveness at air velocity 2 m/s for testing was 0.84 while for theoretical of 0.97. The coefficient of performance (COP) of EAHE increase from 1.341 to 1.761 when the increasing air velocity from 2 m/s to 3 m/s. The COP value also increases from 1.473 to 2.278 at the increasing of air velocity from 2 m/s to 3 m/s. The average of the COP value of the simulation result of the incoming air velocity was 1.99422 for velocity 3 m/s and 1.41426 for the velocity 2 m/s. For the average effectiveness of the simulation result obtained 1.00074 for the velocity of 3 m/s and 0.86100 for velocity 2 m/s.
The Model of Adsorption Isotherm on Reduction of Peroxide Number in CPO (Crude Palm Oil) Using Rubber Fruit Shell (Hevea brasiliensis) as Biosorbent
Authors: Pandia S , Nurfadilla S , Indirawati S M , Simarmata V , Vanessa  
Published: July 2019

Abstract
The object of this resesarch was to determine the model of adsorption isotherm on reduction of peroxide number in CPO (Crude Palm Oil) using rubber fruit shell (Hevea brasiliensis) as biosorbent. The pretreatment of activation (carbonating and chemically) was started by washing and drying the rubber fruit shell under the sun. The adsorption process was done by using biosorbent with the highest iodine sorbent dosage and contact time. The highest iodine number was 913.680 mg/g and was obtained at 1:5 biosorbent to KOH 6 N solution ratio. The best reduction of peroxide number was 83.86% at 0.5% biosorbent dose and 40 min of contact time. The model of adsorption isotherm on reduction of peroxide number was realized with dosis of biosorbent 1%, 1.5% and 2% at time of equilibrium 30 min. The model used was Freundlich and Langmuir isotherm. The result was the constant of Langmuir parameter was maximum adsorption capacity (qm) = 0.0009 and adsorption constant (kl) = -130.488. On the other side, the constant parameter of Freundlich was adsorption constant (n) = -0.579 and capacity of adsorption (kf) = 1.169 x 10−6.
Design of Integrated Waste Management Model of Medan City With Dynamic System Approach
Authors: Kinantan Bag , Matondang A Rahim , Hidayati Juliza 
Published: July 2019

Abstract
Garbage problems occur due to the imbalance between waste production in the community and the government’s ability to manage the waste. The old patern of collect–transport–dispose will give more burden to the system because of the increasing needs of infrastructures. This study aims to develop the integrated waste management model of Medan City with dynamic system approach. To be able to apply the new waste management model, the active roles of community are needed; therefore, it is necessary to know how far the perception and participation of community in the waste management nowadays. Based on the Law No. 18 of 2008 that the waste management starts from the source level (community) that is by reducing, reusing and recycling. The result of the study showed that the community perception on the waste management was good enough, but the participation was still very low both direct and indirect participation. The implementation of waste bank scenario and independent composter per–neighborhood can decrease the waste production entering the landfill (TPA) up to 13.5% and decrease the need of waste truck from 394 units to 333 units. The total cost of waste processing also decrease in amount of 180,257,000,000 in 10 years.
Tourists perception toward public open space’s physical elements (case study: Cermin beach)
Authors: Ginting Nurlisa , Septilia Tias 
Published: July 2019

Abstract

A well-designed public open space in the countryside attract tourists more than usual ones. As a tourism destination, public open space is not just for the recreational purpose, but also could support the local economy. Serdang Bedagai district has lots of nature-based tourism potential, such as a shoreline or beach tourism. Physical elements in this public open space as a tourism destination could attract tourists and affect tourists perception and loyalties. One of tourism destination which managed by local government and empowering locals is Cermin beach. This destination has public open space which has the possibility for social interaction. However, its physical elements tend to left behind compared to another similar tourism nearby. The aim of this study is to identify the quality of physical elements in public open space as a tourism destination based on tourism perception. This research used descriptive analysis with a qualitative method by observed site and a quantitative method by distributed questionnaire. The result indicates that Cermin beach developer is less aware of physical elements in this public open space, both physical carrying capacity and the hygiene throughly.
Crosslink density and rheometric behaviour of natural rubber/chloroprene rubber blends
Authors: Surya I , Siswarni M Z 
Published: July 2019

Abstract
Crosslinking density and rheometric behaviour of natural rubber (NR)/chloroprene rubber (CR) blends with blend ratios from 0.0 to 100.0% rubber were investigated utilizing the semi efficient vulcanization. The degrees of crosslinking density were calculated using FloryRehner equations. The rheometric properties were tested by utilizing moving die curemeter (MDR 2000). From the overall results, cure and scorch times of the rubbers blends enhanced with increases the CR content. Whilst, the maximum values of torque difference and crosslinking density were performed by the rubbers blend with the 50/50 blend ratio.
Effect of epoxidised natural rubbers on curing characteristics of kaolin-filled natural rubber composites
Authors: Surya I , Sukeksi L , Marpongahtun  
Published: July 2019

Abstract
Effects of 2 types of epoxidised natural rubbers (ENR 25, ENR 50), with twenty-five and fifty moles of epoxidation, on crosslinking density and cure characteristics of natural rubber (NR) composites, which were filled by kaolin filler, were investigated using a semi efficient vulcanisation system. The ENRs were added separately into composites at 5.0, 10.0, 15.0, 20.0 and 25.0 parts per hundred rubber. An observation was conducted to investigate the effects of the ENRs on curing and crosslinking density of the kaolin-filled NR composites. Results revealed that both ENR 25 and ENR 50 functioned as curatives and compatibilizers. They decreased both cure and scorch times and minimum torque but increased difference of torque and crosslinking density. The higher ENRs loadings; the lower were the cure time and scorch time, the higher were the torque difference and crosslinking density. At a similar addition, ENR 50 exhibited a more pronounced curative and compatibilization effects than ENR 25.
Effect of Reaction Time and Catalyst Concentration on Making of Epoxy Compounds Using Sulphuric Acid Catalyst Based on Crystallized Palm Fatty Acid Distillate
Authors: Sinaga M S , Simanjuntak J F , Winda O 
Published: July 2019

Abstract
Epoxy is produced from an epoxidation reaction of vegetable oils such as linseed oil, corn oil, palm oil or natural oils that have unsaturated bonds. The aim of this research is to produce epoxy compound based on Crystallized Palm Fatty Acid Distillate. First, the gas chromatography analysis was done to the palm fatty acid distillate. Then, before the epoxidation reaction began, crystallization process was done based on solubility of saturated and unsaturated fatty acid in organic solvent (methanol). In this research, the Crystallized Palm Fatty Acid Distillate that has reacted with acetic acid glacial and hydrogen peroxide, toluene as solvent, sulfuric acid as a catalyst in a three-neck flask fitted with condenser reflux at 700C and stirred at 500 rpm. The catalyst concentration varied from 1.5%, 2.0%, 2.5%, 3.0% and 3.5% and epoxidation reaction time varied from 60 minutes, 120 minutes, 180 minutes, 240 minutes and 300 minutes. The results showed that the highest epoxy conversion was achieved at reaction time of 120 minutes with 2.5% sulfuric acid catalyst concentration against the amount of hydrogen peroxide and acetic acid used. The result of this analysis shows that oxirane oxygen content is 0.96%, iodine number is 17,16g iod / 100 g oil and conversion equal to 81,61%.
Tensile Properties of Sago Starch Biocomposites Reinforced with Nanocrystalline Cellulose from Rattan Biomass
Authors: Nasution H , Harahap H , Fath M T Al , Afandy Y 
Published: July 2019

Abstract
The biomass of rattan is one of natural waste that contains 37.6% of cellulose contents, which is potential to become a source of nanocrystalline cellulose as a filler in biocomposites. There are three important steps to produce alpha cellulose: delignification, alkalization, and bleaching. Nanocrystalline cellulose was extracted through the hydrolysis of alpha cellulose by using sulfuric acid and followed by ultrasonication, centrifugation, and filtration steps. Sago starch biocomposite has been made by casting method. The tensile properties of biocomposite were analyzed and the characterization was done by scanning electron microscopy (SEM). Results have shown that nanocrystalline cellulose has made a strong interfacial interaction with starch that can be improved the tensile strength of biocomposites. SEM have shown smoother and more coherent surface and supported the tensile properties result.
Development of foam porous media to undergo surface and submerged flame during premixed combustion
Authors: Janvekar Ayub Ahmed , Abdullah M. Z. , Ahmad Zainal Arifin , Abas Aizat , Kataraki Pramod S. , Ismail A K , Akhtar Mohammad Nishat , Ishak Hafifi Hafiz , Mohamed Mazlan 
Published: July 2019

Abstract
Behaviour of porous media combustion is mainly relay of material used in reaction and preheat zone to possesses high thermal efficiency. Present study deals development of porcelain foam porous media which shall acts as preheat zone to obey peclet number. While in reaction zone consist of alumina foam. In a dual layered micro burner the thickness of reaction and preheat zone was kept at 15 and 10 mm respectively. Burner was developed to achieve not just conventional free flame but also generate submerged flame, varying equivalence ratio (ER). Further, premixed combustion performance was enhanced by running ER below 1, which is lean condition. While optimum ER for surface flame and submerged flame was found to be 0.7 and 0.5 respectively. Maximum thermal efficiency during for surface and submerged flame was turn out to be 90 % and 38 % respectively.
Evaluation and implementation of cognitive ergonomics in e-wallet redesign to reduce experience effort of e-wallet user
Authors: Adimia Desica Nur , Iqbal Billy Muhamad , Syaifullah Danu Hadi , Zakaria Ahmad Syahid 
Published: July 2019

Abstract
Communication technology in Indonesia is growing rapidly and has an impact on the changing behaviour of Indonesian people, which makes industrial sectors use technology as the value of its products. One example of industry that use technology as the value of its product is payment gateway. It is also supported by Indonesia which is now entering the cashless era. E-wallet is one of payment gateway product that has the potential to be a product of the ideal payment. E-wallet is an electronic wallet that is basically a part of server-based electronic money. However, its current use is still not much demanded by the public because e-wallet products that currently use by most people are difficult and require big effort in its use. Whereas as a product which adopt a “wallet” concept, e-wallet should be equipped with the experience of using a physical wallet those are low-effort experience and ease of use. Therefore, this study aims to evaluate mobile e-wallet application by measuring cognitive load resources and evaluating user experience of e-wallet, then providing new design output that comes with the experience of using physical / conventional wallets and more user oriented. Evaluation was performed on e-wallet application object, namely OVO Wallet, with performance metrics and self-reported metrics measurement. The results of these evaluations will serve as the basis for designing new designs of e-wallet products.
Development of Multi-Objective Models in Zone-Based Dynamic Layout : Literature Review
Authors: Tarigan U , Sinulingga S , Sutarman  , Sembiring M T 
Published: July 2019

Abstract
One of the most challenging aspects of the industrial environment in the 21st century is the uncertainty of production. Changes that occur affect the dynamic layout of facilities that are influenced by mix products and market demand. From identification of review and analysis journals that are carried out based on grouping in terms of the methods used and grouping of parameters, also for the formulation of advanced research based on the development of future methods and complexity considerations, the emphasis on the development of facility layout leads to dynamic changes in facility layout based zones with a multi-objective approach taking into account the dynamism of the area, production, production routes, location, cost, multi-stage and the challenge of changes to the complexity of the layout that has not been done by previous researchers. Also made a milestone in the research journey about dynamic facility layout starting from 1986 to 2017. The research methodology was conducted through four stages consisting of system analysis (entity system analysis), uncertainty analysis (forecasting method), dynamic facility multi-objective layout, and strategies and change (simulation) scenarios. The research was carried out on companies that were volatile, such as factories, furniture, electronics, and others.
Disruption innovation, electronic supply chain management in improving the competitive advantage and the company performance
Authors: akmal S , Sinulingga S , Napitupulu H , Matondang N 
Published: July 2019

Abstract
This study attempts to know whether disruption innovation to exert an influence upon electronic supply chain management, competitive advantage and company performance. Disruption innovative measured by some indicators are : management and leading, technology, and organization culture. Variable electronic supply chain management measured by some indicators are: communication, collaboration, information sharing, trust, and trading partners power. Variable excellence compete measured by 5 indicators: the price, quality, delivery, product innovation, and time to market. While the company variable measured by 3 indicators: the financial performance, operational performance and performance based market. Data collection is carried out by means of a detailed questionnaire distributed. Methods of analysis used in this study is the Structural Equation Modelling (SEM) using Practical Least Square (PLS). This research result indicates that disruption innovation give impact on electronic supply chain management and competitive advantage.
Calorific Value of Oil Palm Frond Through Bio-Charcoal Briquette as Renewable Energy
Authors: Maulina Seri , Sarah M. , Anwari F N , Siregar A E 
Published: July 2019

Abstract
By product of oil palm plantations such as oil palm fronds have the potential to be processed into more valuable products. The aim of this study to to diversify these by product into natural products through the process of carbonization and briquetting. Around 50 grams of oil palm fronds were carbonized with a furnace at a temperature of 500 °C for 45, 60 and 90 minutes to produce bio-charcoal. Gluing process on the bio-charcoal is carried out using a starch-based adhesive mixed with water at 20% concentration, with the variation of the ratio of adhesives and bio-charcoal were 30:70, 50:50, and 70:30. Subsequently, the bio-charcoal briquettes were pressed using a hydraulic piston machine with a pressure of 30 kg/m2. Calorific value analysis was conducted to test the performance and quality of wood charcoal briquettes.