bluuebunny/crossref_metadata_2025 huggingface dataset:
The aluminum powder size’ effect on rice plant fiber reinforced composite to hardness, wear and coefficient of friction of brake lining
Authors: Darmawan A S , Purboputro P I , Febriantoko B W
Published: January 2020

Composite particles are composites that contain particle or powder-shaped reinforcing materials. Particles as reinforcing materials greatly determine the mechanical properties of composites because they carry the load distributed by the matrix. The particle size, shape, and material are factors that influence the mechanical properties of particle composites. The friction component material that is intended for brake lining applications is strongly influenced by the size of the particles and the direction of loading. On the other hand it is necessary to step up the particle size optimization which will affect braking performance, which includes: friction numbers, wear, friction time and friction temperature produced. Therefore this study is aimed at optimizing the particle size against hardness, wear resistance and friction of aluminum powder in rice plant fiber reinforced composite. In this study, the materials used in the experimental process were rice plant fiber, fiberglass, aluminum powder and polyester resin. After the material is processed into the composite, hardness is tested using the durometer shore hardness method, after that, wear and friction testing were conducted. The results show the smaller the size of the aluminum powder, the harder the composite. The smaller the size of aluminum powder, the less wear of the composites. The failure of the adhesive was seen in the specimen tested for wear.
Lighting Quality Improving Work Thoroughness of Sorting Operators
Authors: Anizar  , Siregar I , Putri E , Maududi I , Habibi W
Published: January 2020

This study observes work thoroughness of sorting operators in quality control station at drinking bottle industry. Operators sort the bottles manually using naked eyes to decide whether the bottles have some defects or not. Dirty bottles, cracked, chipped or have water volume that is different from other bottles will be taken by operators. The low light intensity in quality control station causes high numbers of defect bottles to pass the inspection. The standard of Government of Indonesia Health Ministerial Decree No 1405 The Year 2002 that work performed continuously needs 200 lux of lighting. Illuminance level measurement is conducted for five days at 09.00, 11.00, 13.00, and 15.00 o’clock using lux meter on four measurement points using a grid of 1m x 1m. In this study, the average light intensity in quality control station 1 and 2 is 59.30 lux and 52.15 lux. The number of defective products that pass the inspection in a quality control station for 5 days of observation is 2,676 bottles or 55.47% from the total defect products, while the number allowed by the company is only 5%. The correlation between illumination factor in quality control station 1 and defect products that pass the inspection is calculated moment Pearson correlation product and the results are ŷ=292,885-1,317x and r=-0,3147, while in quality control station 2 the results are ŷ=524,077-4,919x and r=-0,6329. The higher illumination level, the lower the number of defective products that pass the inspection, which means operators’ work thoroughness improve.
Modified EOQ Model for Refrigerated Display’s Shelf-Space Allocation Problem
Authors: Satiti D , Rusdiansyah A , Dewi R S
Published: January 2020

This study modifies the economic order quantity (EOQ) model for the problem of allocating refrigerated rack space in retail. The purpose of this study is to obtain the amount of space allocation for each product that can maximize retail profits. In the modified EOQ model, there are three components of storage costs, specifically storage costs, energy costs and quality costs. Energy costs and quality costs are adjusted to the ratio of cooled performance (i.e. Coefficient of Performance) and quality deterioration rate, respectively. This study adapts Water’s algorithm for EOQ orders with constraints on storage space in determining the amount of space allocation for each product. The Water’s algorithm uses an Additional Cost approach that is inherent in each unit of space used. The results show the cooling temperature is an important parameter in determining energy costs and quality costs. Through numerical examples, it is determined the right storage temperature and space allocation which gives maximum profit.
Redesign of wudhu facility for disabilities using integrated kansei method
Authors: Prabaswari A D , Fernanda M A , Jati N P , Indrawati S , Aldhiza R A
Published: January 2020

The research is a wudhu place that is friendly to people with disabilities, especially wheelchair users. The purpose of this study is to find out and develop a design using integrated TRIZ, Kansei and anthropometry method. The first assessment wudhu facility using RULA method. The score of RULA is 5 which means changes required soon. TRIZ and Kansei method to defined solution the redesign wudhu facilities and anthropometry to define the dimension of design. The scope of research only redesigns, implementation not yet.
NCTF Control Performance Analysis on Rehabilitation Robot
Authors: Herianto  , Riyadi A F , Mastrisiswadi H
Published: January 2020

The need for rehabilitation robots is increasing, while the current price is too high. One reason for the high price of rehabilitation robots is the complicated controller design. For this reason, there is a need for a simpler controller design to be produced at an affordable price. In this study, the NCTF control system tested its performance on a rehabilitation robot prototype with a horizontal linear motion system. The tests are carried out using point to point and set point tracking commands. Point to point testing is carried out at a distance of 50 mm, 150 mm and 230 mm. Meanwhile, set point tracking testing was carried out on the sinusoidal wave with a 100 mm amplitude and a frequency of 0.25 Hz. Both tests were carried out by giving a load of 0 Kg, 0.82 Kg, and 1.64 Kg. The results of this study indicate that the NCTF control provides a good response. The steady-state error value for all point to point motion commands below 2%. As for set point tracking commands, the system can follow orders properly, but there is a 0.24-second delay.
Application of ZnO nanoparticles for Producing Antibacterial Batik
Authors: Eskani I N , Haerudin A , Setiawan J , Lestari D W , Isnaini  , Astuti W
Published: January 2020

The government of Indonesia has launched a program of ‘Making Indonesia 4.0’ since April 4th 2018. The program is an integrated roadmap to implement a number of strategic action to enter the 4.0 Industrial era. One of the strategic initiatives is the development of functional clothing by producing a cloth that has multifunctional properties, such as antibacterial clothing. Batik, a traditional cloth is originally from Indonesia. It is fabricated by applying hot wax onto a fabric to create a pattern before colouring process which is then removed in the final stage. Since people use batik in daily life for clothing and household appliances, it is worth to produce antibacterial batik. This research aimed to make antibacterial batik by applying zinc oxide (ZnO) nanoparticles to the material of batik i.e. cotton. Colouring process was conducted by synthetic dyes of indigosol. To see the effect of ZnO application, the antibacterial activity, the colour fastness to washing, the colour strength (K/S) and surface morphology of batik have been examined. The results showed that the batik exhibited antibacterial activity due to the incorporation of ZnO onto the fabric. The colour strength was also enhanced. To maintain the colour fastness to washing, the ZnO should be applied to the fabric before the batik process.
Innovativeness, Proactiveness, and Risk-taking: Corporate Entrepreneurship of Indonesian SMEs
Authors: Astrini N J , Rakhmawati T , Sumaedi S , Bakti I G M Y , Yarmen M , Damayanti S
Published: January 2020

Corporate entrepreneurship (CE) consists of three dimensions, which are innovativeness, proactiveness, and risk-taking. It has an essential role in ensuring SMEs willingness to adopt technology in the 4.0 industrial era. The aim of this study is twofold. First, to discover the pattern CE (innovativeness, proactiveness, and risk-taking) intensity on four SMEs and second, to identify the likely causes of that pattern from a strategic management perspective. This research employed a case study design with four Indonesian SMEs as the subjects. The data was gathered through guided interviews and observations. Dyadic data was collected to avoid bias. The answers were then put into a scale from one to seven by the informants and combined using a simple mean. A pattern was inferred from the scale. The results suggest that all four SMEs have a similar low-medium range of CE intensity. From the strategic management standpoint, this was likely due to the fact the SMEs have not conducted proper environmental scanning in terms of looking for new technology or embraced the involvement of low-level employees in their planning process.
Applying Kaizen in Quality for Reducing Dent Defect per Unit
Authors: Wicaksono P A , Rozaq R
Published: January 2020

Continuous improvement (Kaizen) is considered as a main concern and prerequisite for competitiveness in today’s manufacturing. One form of continuous improvement is in the field of product quality. The continuous quality improvement is the key to long-term success and high performance of the organization. A case study was conducted in a manufacturing company. In the year 2019, company has not yet reached the target in particular on cylinder head part. One of the defects that still occur is dent. Research carried out using Toyota Business Practices (TBP) approach. Toyota Business Practices is a method for applying kaizen in daily work. This study aims to reduce the number of defect using Toyota Business Practices. By applying Toyota Business Practices, the results of the improvement made were obtained improving the position of shutter table, installing slipper stand, and improving the design of slipper stopper. With these improvements, the average dent defect per unit reduced by 4.35 %. Furthermore, it will get the new standard to ensure the quality of product in the future.
Cost and Emission Optimization in Power Plant Using the Single Echelon Economic Dispatch Model (SEED)
Authors: Wahyuda  , Muslimin  , Widodo S U
Published: January 2020

The electricity supply chain system consists of power plants, transmission and distribution. Differences in power plant characteristics cause differences in fuel costs and emissions. Inaccuracies in scheduling the plant have an impact on the surge in fuel use. This becomes the basis for the optimization of power plant scheduling. Optimization on the generator side is usually using the economic dispatch model. However, the Economic Dispatch Model does not consider optimization on the transmission network. Optimization on the transmission network is needed because there are losses in the transmission network. Losses will be even greater when the distance between the power plant and the customer is getting further away. So if distance can be minimized, fuel costs can be reduced. Minimizing the distance for shipping goods can use the transportation model, but the transportation model cannot be used for electricity distribution. This is because there are differences between goods and electricity. Therefore, this study proposes the Single Echelon Economic Dispatch (SEED) model. This model is a combination of the economic dispatch model and the transportation model. This model is able to do simultaneous optimization between the generator side and the transmission side. The model is applied to the Mahakam system in East Kalimantan, using all PLN’s power plants. Load consists of two types, namely low load and peak load. As a result, in peak load and low load conditions, the P11 power plant produces the biggest losses and emissions. This is because electricity production in P11 has to go through a longer path compared to other plants. The P11 is also a power plant that requires the highest fuel costs
Research on a Project Schedule of Factory Renovation for Manufacturing Plants in Bandung
Authors: Tripiawan W , Miranda S
Published: January 2020

Renovating a plant facility is an example of a project. It is a complex process that the project needs to complete all the task while ensuring the operations without disruption. In project management, scheduling and cost optimization are two main operation problems. These correlate with each other and have proven mathematical solutions for the basics. In this study, the case study faced was to prepare a schedule plan in the process of renovating factory facilities. The facilities to be renovated are based on 2 main facilities, namely Production office facilities and Fabrication plant facilities. The implementation of the renovation of the 2 facilities has constraints in the time available. With the CCPM approach, this study proposes a schedule for implementing renovation projects with limited availability of time. The results obtained; this factory facility renovation project is scheduled to be completed less than 40 calendar days.
Design improvement of multifunctional seatbelt by using integrated kano model and quality function deployment
Authors: Rizqi Z U
Published: January 2020

Increasingly developing technology makes human easier to carry out the life, and one of them is in the transportation sector. The high number of vehicle accidents causes losses to the passenger so that it requires safeguards to minimize these losses, one of the ways is by using a seat belt. This study aims to design a voice of customer-based seat belt using integrating Kano model and Quality Function Deployment (QFD) produced by an innovative product, namely “Multifunctional Seat Belt for Vehicle Safety”. Through the distribution of questionnaires, 8 attributes are needed in the design of the seat belt. The results of the Kano Model analysis show that 2 attributes fall into the indifferent category which is then eliminated because the presence or absence of these attributes does not affect customer satisfaction. The other 6 attributes are portable, can store items, can hold the body while sleeping, can warm the body, there are pads on the sides of the head, and adjustable strap. These attributes are entered into the QFD framework until phase 1 to obtain a priority sequence that is useful in the production process later. In addition, MUSESA is designed with anthropometric approach which is using 5 dimensions so that it is ergonomic for users.
Determination of Criteria and Sub-criteria in Urban Solid Waste Processing Technology
Authors: Ishak A , Hidayati N
Published: January 2020

Solid waste is known as waste, which it recommends is often undesirable because it has no economic value. One of the factors that affect the amount of waste is the amount or population density. The high population has caused the amount of waste to be higher. The waste management system in the landfill (TPA) is open transportation, so that it can increase the amount of land needed every year. Therefore, in research, it is necessary to have a technology for municipal solid waste treatment with appropriate criteria and subcriteria. Determination of criteria and sub-criteria for urban solid waste processing technology using the Delphi method with 3 respondents. The results obtained are that the criteria consist of three aspects, namely economic aspects, environmental aspects, and technological aspects. It also consists of 12 subcriteria, namely, Equipment Costs, Material Costs, Maintenance Costs, Residual Quantity, Emis Rate, Impact of Odor, Operating Temperature, Performance, Product Quality, Duration of Process, Area, Easy Operation.
Analysis of crude oil inventory using the material requirement planning method
Authors: Sutrisno W , Airlangga H N P
Published: January 2020

Inventory management plays an important role in the company’s success in producing products in quantities based on customer demand. This study uses the MRP method to determine the management of PT. X crude oil inventories so far and produce crude oil inventory management and the arrival schedule of crude oil that must be applied at PT. X. The results show that when manipulating MRP Super Heavy Crude oil from 10 days to 6 days (exercise), better inventory management ie crude oil stocks are in a safe position between safety stock and tank capacity.
Integration of deterministic and probabilistic inventory methods to optimize the balance between overstock and stockout
Authors: Rizqi Z U , Khairunisa A
Published: January 2020

In inventory management, stockout and overstock are problems that always occur in the inventory system. The limitations of the method make it difficult for companies to determine the level of inventory following probabilistic inventory conditions. Ajeng Gallery is a quality bag craft company that has problems in the supply of raw materials where there is always a large stockout and overstock. The research is limited to cow leather material which is the main material based on the results of ABC analysis. This research also integrates Min-Max method which is a deterministic method to determine the level of inventory then the results will be integrated with Monte Carlo simulation which is a probabilistic method so that it can evaluate the amount of stockout and overstock that occurs. The results showed that the company no longer experienced stockout for 1 month and the amount of overstock decreased by 0.42% of the actual system.
Occupational Health and Safety Effects on Productivity in a Garment Factory Using Structural Equation Modeling
Authors: Suryoputro M R , Sari A D , Puji A A , Basumerda C , Purnomo H
Published: January 2020

An industry goal is to create a product to make a profit. Development of human resources is one important thing for a company to consider. Companies have an opportunity to increase work productivity by the rules of OHS (Occupational Health and Safety). This study aimed to: (1) Partially determine the influence of work safety on employee productivity. (2) Partially determine the influence of health on employee productivity. (3) Simultaneously determine the influence of health and safety on employee productivity simultaneously. (4) Determine that variables that have a major influence on employee productivity. A questionnaire was used to collect data from 200 respondents. Results of SEM showed that safety did not have an effect on productivity (p=0.467). However, occupational health effected productivity (p=0.002). Thus, health has a significant influence on work productivity.
Clustering Storage Method for Digital Evidence Storage Using Software Defined Storage
Authors: Mohammad Faruq Afif , Mukhammad Andri Setiawan , Yudi Prayudi
Published: January 2020

The increasing of cybercrime means an increase in the number of digital evidences produced in these criminal activities. Also, to pay attention to the security and integrity of digital data, the construction of digital evidence storage must pay attention to the need for convenience in adding storage and the need for investigators to avoid geographical problems in carrying out their duties. An ideal implementation of the problem is the development of network-based digital evidence storage using the Software-Defined Storage to build a clustered storage system. In this study, we build a clustered storage system using Ceph that will be functioned as digital evidence storage. Ceph is a Software-Defined Storage which is designed to provide excellent performance, reliability and scalability. On the other hand, since digital evidence is fragile, then the security of storage system must also be considered so that the stored digital evidence in the storage system can be accepted in court. The security includes aspects of confidentiality, integrity and availability aspects. We were able to build a storage system using Ceph and as a result, our system storage has met the aforementioned scalability, confidentiality, integrity and availability aspects. The storage system is expected to contribute in terms of digital evidence storage and preservations.
Identifying Morphology of The Rat Flea Arthropod as a Vector of Plague Disease Based Microscopic Image
Authors: Muhimmah I , Lusiyana N , Fatmawati
Published: January 2020

The morphological identification system vector of pes disease is one of teaching aids students of the Faculty of Medicine of Universitas Islam Indonesia. The students needs to study the morphological characteristic under the microscope. In practice, it proof difficult to distinguish the kind of various ordos of flea. Thus, the computer teaching aids on this subject need to be developed. The purposed system identified the morphological characteristic of the insect using their size, shape, and texture features. At the identification stage, ten features selected using the Correlation Features Selection (CFS) with method search Best first. This system can also provide additional information about the taxonomy and general characteristics of parasitic insects. The method used for the classification of parasitic insects is KNN, which provides accuracy for body detection of 97.0377% and head detection of 75%. The system has been validated through the expert and its classification correlation reached Cohen’s Kappa.
Solution-Based Learning Implementation in Design Course
Authors: Risdiyono
Published: January 2020

Student participation is a key success in almost every learning process. It is believed that concept-level of understanding could be achieved only if students are actively involved in the learning activities. The concept of student centered and active learning is usually adopted in order to improve student participation. Problem Based Learning is one of popular methods used in this paradigm, in which students learn both thinking strategies and domain knowledge of a subject through the experience of problem solving. In addition to this current well-known learning method, this paper introduces a new approach so called Solution Based Learning in which students learn about a subject by analyzing solutions that has been given by some experts. Basically, the concept urges students to analyze the way of thinking of the experts on why they could give the solution like this and that. Students then may adopt the thought or criticize it in a positive manner. In order to see its viability and applicability, this new concept has been implemented in Product Design and Development Course as a case study. Based on the process performance analysis, it is shown that the proposed approach is able to improve student participation, to make class more active and to improve the overall student understanding of the subject of study
Proposing a More Efficient Maintenance Scheduling for an Overhaul Maintenance Project in Engineering Asset Management
Authors: Cahyo W N , Hasibuan F W , Hendradewa A P
Published: January 2020

In maintenance activity, scheduling planning is an important step to improve the performance of maintenance department. In some cases, the data to support the process to develop the maintenance schedule is unavailable. In this research, it is argued that Genetic Algorithm (GA) is an appropriate tool to support the decision maker in order to develop the schedule. The data required in this research is obtained from the maintenance data in the sugar milling company in Yogyakarta. The company run the production of sugar and spirits/alcohol. The Production process (milling seasin) is usually performed within the harvesting months of the raw material: the sugar cane. It is approximately in the month of February to August. On the other hand, the overhaul maintenance process is performed after the milling season. The overhaul maintenance planning is created by the manager of the maintenance department, and usually is done using the manager qualitative approach without any sciencetific approach. To get a more efficient schedule of maintenance, several parameters are set in this research. The parameters are then applied as the paramenters in GA. Those are: The number of manpower required and the duration of operation each activity. To run the GA model, Python programming is used. Before start the GA process, the parent chromosom and its fitness are determined. The date of maintenance activity start per each activity is set as the parent chromosome and the fitness is determined using a formula. The process of finding the better maintenance schedule is then performed based on the procedures in GA. It is indicated from the result that the proposed schedule generated in GA required less number of manpower.
An ergonomic, mobile and portable design of porang cutting and drying machine on motorcycle
Authors: Nurmianto E , Anzip A , Kusrini D E
Published: January 2020

This research is aimed to improve management of Porang (Amorphophallus Muelleri Blume, Indonesia Konjac), in Glucomannan Industrialization. The problem arises when they cut and dry manually on porang with very low productivity. Problems solved when there is a machine for cutting and drying porang on motorcycle which are Mobile, Portable and Ergonomic. This machine used to process with a higher production capacity. This porang processing innovation in the form of cutting and drying machine as well as processing porang into various preparations that combine several processing functions that are safe, comfortable, and healthy for its users and effective for their products. The conclusion is (1) from the data test of the machine it got 15 mm diameter of porang with maximum force of cutting machine is 22,1 kg, (2) Already build drying machine porang that can produce 1,061 kg/hours porang chips, (3) Based on the test and calculation, the porang’s cutting and drying machine can produce 190,89 kg/hours porang chips. Then if it observed from manual cutting that can only produce 65 kg/hours porang chips, so this machine can increase 3 times of productivity of the farmers. Finally, it is hoped that after using this machine, farmers will be prosperous.
Ni Metal Extraction with Surfactant Variation on Double Surfactant Emulsion Liquid Membrane Technology
Authors: Yuliusman  , Nafish A R , Salsabila C S , Ayu M P , Isa M
Published: January 2020

Nickel metal extraction from hydrotreating catalyst waste is an attempt to recover purer Ni metal using extraction process. Emulsion liquid membrane with double surfactant was chosen because this extraction method has the highest separation efficiency, shorter time of process, and simple process steps. The double surfactant that was varied in this study was a mixture of Span 80 with Tween 20 and Span 80 with Tween 80. The experimental results showed that the best nickel extraction was obtained using Cyanex 272 extract with a concentration of 0.06 M, 8% (w / v) surfactant double Span 80 with Tween 20, with an internal phase ratio and organic phase of 1: 1. The extraction process lasts for 15 minutes with a stirring speed of 250 rpm.
Proposed Reaction Mechanism of Chitosan-graft-Maleic from Chitosan and Maleic Anhydride
Authors: Timotius D , Kusumastuti Y , Putri N R E , Rochmadi
Published: January 2020

Chitosan (Ch), a natural polysaccharide derived from chitin is a widely used raw material in biomaterial research. Modification of chitosan using maleic anhydride (MA) have been done by several researchers with dimethyl sulfoxide (DMSO) and acetic acid as a common solvent. In the present work the chitosan was grafted with maleic anhydride using acetic acid and water as a solvent toward ecofriendly functionalization process. In addition, proposed mechanism of this grafting was further studied. The total acidic content and conversion of grafted films were calculated with varying concentration of MA:Ch ratio and temperature. The success of chitosan grafting with maleic was verified by Fourier Transform Infrared Spectroscopy (FTIR) analysis. FTIR analysis showed the appearance of new ester group and shifting of amide group from FTIR spectra which indicates that the esterification and amidation occurred in this grafting process.
Analysis of effectiveness of heat exchanger shell and tube type one shell two tube pass as cooling oil
Authors: Napitupulu Farel H. , Situmorang Romulus , Sihombing H V
Published: January 2020

Heat exchanger is a device that produces heat transfer from a fluid to another fluid, which can be applied as a cooling oil to maintain the oil temperature at the operating standard. This study was conducted to determine whether the oil temperature exit the shell and tube heat exchanger one shell and two tube pass, by calculating the effectiveness of the cooling oil on the tube (tube) using water as cooling fluid flowing through the shell (shell) using NTU-ε and experimental studies. Shell and tube heat exchanger one shell and two tubes pass effective used to cooling oil, because it can reduce oil temperature up to 32 %.
Design of microhidro turbine for electricity plants based on techno park in cimanggu village
Authors: Samosir Rahmad , Turnip Kimar , Simanjuntak Sutan LMH
Published: January 2020

The utilization of water as a natural resource of renewable energy for power plant is one of the alternative solutions to replace the need for fossil fuels. In Cimanggu village, there is a river that has a waterfall, which can be used to generate electricity. But the waterfall is currently used as a village tour. From observations and the calculation speed of the flow by using buoys, and river cross-sectional area obtained the total river debit Q more than 0.07 m3 / s. From the measurements is also obtained high fall the waterfall H = 22 m. Based on the existing height and debit of the water fall the major dimensions of a water turbine Pelton Micro Hydro type as the driving power generator was planned. The results of calculations for effective head = 18 m, with a water debit that is used to drive the runners Q = 0.07 m3/s, gained power generated by 7,0 kW. By the data is planned the main dimensions of micro turbine, Pelton outer runner diameter D = 250 mm, the diameter of the circle pin DL = 346 mm, number of blades z = 12 with 2 nozzles, and a shaft diameter ds = 30 mm. In planning this turbine, water is only directed to radiate to one side in order to replace the function of the waterfall. Because water is directed to one side, the shaft will experience an axial force (which is parallel to the shaft).
Study on the performance of the Otto engine by using mixtures of gasoline-bioethanol of nira
Authors: Sitorus T. B. , Siagian J. A. R. , Christopel B.
Published: January 2020

One of the alternative fuel that can be used for Otto engines is bioethanol. Bioethanol has a high octane number and higher oxygen content than gasoline and produced emissions are more environmentally friendly. This research to determine the Otto engine stationary four-stroke performance when using a gasoline-bioethanol mixture. The study was carried out with variations in the composition of the mix of bioethanol-gasoline, variations in engine speed and load engine. The experiment results show that the maximum thermal efficiency obtained is 29.63% when using gasoline at 1000 rpm and the load of 20 kg. The minimum SFC value is obtained 284.47 gr/kWh at 1000 rpm when using gasoline for the load of 20 kg. The SFC has increased when using a bioethanol-gasoline mixture. However, the exhaust emissions produced when the engine uses a mix of bioethanol-gasoline, it becomes more environmentally friendly.
Manufacturing and testing prototype of a gamma type Stirling engine for micro-CHP application
Authors: Jufrizal  , Napitupulu Farel H. , Ilmi  , Ambarita Himsar
Published: January 2020

In this study, a gamma type Stirling engine was produced and tested for the micro-CHP system with a swept volume of compression 106 cc. The engine is tested by air and uses LPG fuel as a heat source. Air pressure at the beginning of the compression process is considered to be the ideal gas pressure of 0.987 bar. The best working characteristics of the machine were obtained in the first test with a temperature difference on the hot and cold side of an average of 74.7°C. Maximum output and power output were obtained at 1.82 bar charge pressure of 242.6 rpm and 12.9 W. The results found were encouraging to begin the prototype gamma type Stirling engine for micro-CHP applications.
Experiemental study on solar dryer with extended flat plate collector
Authors: Qadry Al , Hutagalung Tommy , Harry Kevinta J.M , Napitupulu Richard A. M. , Ambarita Himsar
Published: January 2020

These study relates to coffee dryers sourced from solar energy, the main objective of these experiements are make solar drying tools more effective, save time, and get good quality coffee beans, so that they can be received by the community. The parameters that are used in this combustion are temperature, rh, sun intensity, weight, and Mr. the results obtained are that the temperature can vary between 40-60°C, with a maximum rh is 5%, weighing 4.291 kg, and finally getting the drying rate. The main conclusion are these temperatures are very suitable for drying coffee beans, the higher the intensity of solar radiation will reduce the drying Moisture ratio and can be reduce of mass coffee.
Design tools multifunction equipment
Authors: Siregar Ikhsan
Published: January 2020

Product design can be defined as idea generation, concept development, testing and implementation of manufacturing (physical objects) or services. Product designers create concepts and evaluate ideas, making ideas come true through products in a more systematic approach. The purpose of this research is to help farmers who are engaged in SMEs chips. Tool attributes are derived from results brainstorming by tool designers. Design size data is obtained from direct observation and survey market of sliced chips on the market and according to consumer tastes. This versatile slicer is used to increase the production of farmers. The data obtained for the specification of the tool is data from the results of answers on questionnaires distributed directly to entrepreneurs SMEs chips residing in some areas, Medan Tuntungan, Medan, Indonesia. Brainstorming is a method used to generate a large number of ideas that most of these ideas will be discarded. With QFD method, compared multifunction slicing tool with 3 other competitors with the same attribute. Sub solutions are generated from the completion of any emerging issues, including in selecting attributes for bird repellents using measures Nigel Cross to maintain excellence and improve product quality. From an alternative generation with a combination of attributes, the result is an alternative 1 as the basic criterion in making an orange-drawer. Evaluate alternatives using Pairwise Comparison and scales AHP to calculate the weighting of each attribute and determine the ranking of each alternative. Value engineering is the final step in the design process with the aim of increasing the value of the product to the consumer and lowering the costs that must be incurred by the manufacturer
Using filtration as a technology to remove pollutants in domestic wastewater
Authors: Utari Andiny Widya , Herdiansyah Herdis
Published: January 2020

Most of the wastewater produced comes from household activities. Household wastewater currently tends to be directly disposed into water bodies without prior treatment. As a result, the concentration of pollutants, especially TSS and COD in the waters became high. It is necessary to manage household wastewater, so that the disposed waste is still within safe limits that do not pollute the environment. Filtration is one of treatment methods which is generally used in the processing of clean water, but the materials used in the filtration process also have the ability to reduce pollutant levels in wastewater. This study aims to find out that filtration can be used as a method of household wastewater treatment. The method in this study is to conduct a trial using a simple filtration method to analyse the decrease in household waste levels. The result shows that the percentage of TSS and COD removal are 79.01% and 77.84%. The conclusion in this study is that filtration can be used as a method of household wastewater treatment because the material used can reduce the concentration of TSS and COD to below the specified quality standard.
Air temperature analysis in Kalijodo green open space (study in penjaringan, North Jakarta)
Authors: Pardamean Mbarep Daniel Putra , Herdiansyah Herdis
Published: January 2020

Green open space is a public space created with the aim of carrying out one of the ecological functions as a climate regulator to create an air temperature that matches thermal comfort. Regarding the function of Kalijodo’s green open space in regulating microclimate, a study was conducted to measure air temperature using Thermo-hygrometer in 5 (five) monitoring location points (TP1, TP2, TP3, TP4, TP5) at different times. The measurement results show that the air temperature in the green open space of Kalijodo has a mean value of 33.22°C and exceeds the specified threshold (20.5-27.1°C). This is influenced by the physical conditions of the environment such as damaged and arid soil conditions and vegetation density. So that it is necessary to arrange green open space in accordance with applicable provisions so that functions in green open space can run ideally and sustainably.
Review on community-based strategies for improving the quality of lake waters (Case study: Urban Lake Rawa Besar, Depok, West Java, Indonesia)
Authors: Saragi Putri Andreyna , Budhi Soesilo Tri Edhi , Abidin Chairil Abdini
Published: January 2020

Lakes provide important habitat for fish, birds, reptiles and aquatic plants, and produce fishing, tourism and recreation industries. However, the condition of the lake’s water quality continues to decline. Until now, lake management has not reflected sustainable lake management. This paper aims to provide a review of community-based water quality improvement strategies. The case study is in urban lake Rawa Besar, Depok, West Java, Indonesia. This paper not only provides a strategy but before that there is a comprehensive analysis of the factors causing a decline in the quality of lake waters, so that the strategy is expected to be appropriate. The community is also expected to be the main and first protector of the condition of the quality of the lake waters.
Sustainability assessment in construction industry supply network: a review
Authors: Sitepu Muhammad Haikal , Matondang Abdul Rahim , Tryana Meilita
Published: January 2020

Construction industry plays important role to support human welfare by providing access for living and moving. Developed countries are characterized by having good infrastructures such as roads, bridges, office towers, residential buildings, seaports and airports. To have these infrastructures, massive construction projects must be implemented by construction industry. This industry consists of several activities such as extracting raw materials, manufacturing construction’s materials, construction projects, infrastructure operational, and after operational activities that are run by different organizations and companies. These organizations and companies configure construction industry supply networks. Despite of the positive impact of these supply networks in improving human and product mobility, these supply networks also responsible for significant negative impacts such as consuming high energy and material resources, producing greenhouse gas emission and creating waste. To monitor and maintain these negative impacts, a sustainability assessment process is required. This paper aims to review sustainability assessment process in construction industry supply networks. It was found that different indicators are required for assessing activities in each stage of supply networks.
Analysis of mechanical and physical behaviour of post-burn concrete
Authors: Karolina Rahmi , Yulia Corsika M. S
Published: January 2020

The occurrence of a high temperature change, such as in a fire incident will have an impact on the concrete structure, cracked surface structure, damage/collapse, and discoloration of the concrete. This research is conducted on K300 concrete with a sample of 15 cm x 15 cm x 15 cm cubes. Burning is carried out at temperatures of 250°C, 500°C, 750°C, and 1000°C with a containment time of 2, 4 and 6 hours. The cooling process is carried out by immersion then rested for 24 hours at room temperature. From the results of the research obtained at temperatures of 250°C, 500°C, 750°C, and 1000°C, the decrease in compressive strength are 4.44% -7.41%, 12.59% -22.96%, 56.44% -66.22%, and 76.74% - 100%. At the containment time for 2 hours, 4 hours and 6 hours, the decrease in compressive strength are w = 4.44% - 76.74%, 6.67% -93.70%, and 7.41% - 100%. At temperatures of 250 °C, 500°C, 750°C, and 1000°C, the increase in porosity are 8.09% - 9.57%, 11.79% - 15.50%, 16.98% - 18.46%, and 19.20% - 26.61%. At the containment time for 2 hours, 4 hours, and 6 hours, the increase in porosity are 8.09% - 19.20%, 8.83% - 22.16%, and 9.57% - 26.61%. From this research, it can be seen that the increase in temperature has a greater impact on the decrease in the compressive strength of concrete and the increase in the porosity of concrete compared to the increase in the combustion duration. Through this research, regression equations are generated which can be used to calculate the residual compressive strength at other combustion temperatures.
Analysis of quenching heat treatment, martemper on structure micro and hardness in SCMn3 steel.
Authors: Max Sesmaro Yuda
Published: January 2020

Microstructure analysis and hardness analysis has been carried out on cast steel for components of soil digging machines due to heat treatment of quench, and martemper. The presence of residual austenite causes wear resistance and reduced fracture strength in the earth quarry component to function as a support for the designed arm. In its manufacture, it uses metal casting technology and heat quenching treatments and templates in suitable cooling media, to meet standard requirements. The temperature treatment of austenite 875 °C temperature was held for 90 minutes, and then quenched with variations in the cooling media of water, oil, and salt bath. Furthermore, the martemper process at 425 °C for 90 minutes is cooled to air to room temperature. Microstructure testing and weight percent composition using SEM-EDX and Brihnell scale hardness test. The analysis shows that the hardness value (388 HB) of cast steel quenched in salt bath media is greater than ordinary water (299 HB) and oil (260 HB). However, after the martemper process the value of hardness drops to (342 HB) in the salt water medium, which remains larger than ordinary water (264 HB) and oil (233 HB). This is due to the faster cooling speed in brine and produces martensitic microstructure and residual austenite after being observed with SEM-EDX. The results of this study meet the quality requirements according to the JIS G5111 standard where the minimum hardness value is 222 HB, to be used as a component in excavator.
Analyze the proportion of volcanic ash of Sinabung volcano at the most optimum to get the compressive strength and tensile strength of concrete
Authors: Sebayang Melya Dyanasari
Published: January 2020

The development of concrete as construction material is growing very rapidly followed by the needs of diverse communities. Based on the problems, we need knowledge and inovation to get a good quality concrete with low cost. In this study, volcanic ash of Mount Sinabung was chosen as an alternative material plus concrete filler. Materials derived from the bowels of the earth will be tested optimum levels that can be used to achieve the compressive strength and maximum tensile strength. The concrete to be tested is a concrete mixture design with fc ′249 kg / cm2 (K-300). The concrete mix design was done by reducing the use of cement and the addition of volcanic ash of Mount Sinabung (0%, 10%, 15%, 20%). Compressive strength is tested when it’s 7, 14, and 28 days old. But, ultimate tensile strength is tested when it’s 28 days old. From the test result, we get optimum percentage with volcanic ash from Mount Sinabung is 10% with compressive strength 19.689 Mpa and ultimate tensile strength 1.348 Mpa. However, material is still worthy to use as concrete because it is compressive and ultimate tensile strength that almost reach normal compressive and ultimate tensile strength. Moreover, the using of material as admixture for concrete can be used as an alternative to save the environment from pollution.
Estimating the opportunities of ester content improvement through variation of NaOH, KI And KIO3 developed impregnators on activated natural zeolite catalyst for methyl ester synthesis
Authors: Kurniasih E , Pardi P
Published: January 2020

The Content of esters are the number of compositions of esters formed after the esterification and / or when transesterification reaction takes place. Esters are formed by breaking up the alkyl acid carboxylic group of fatty acids or triglycerides which react with methyl groups from methanol. To increase the reaction rate, heterogeneous catalysts were synthesized using impregnators NaOH, KI and KIO3. The impregnator is carried out in the framework of natural zeolite with a concentration of 2.5% (w/v). The zeolite framework was previously activated using 6M HCl solution for 10 hours at a temperature of 90°C. To strengthen the impregnator bond on a heterogeneous zeolite catalyst, calcination was carried out at a temperature of 600°C for 4 hours. Heterogeneous catalysts were tested on biodiesel production using a transesterification reaction. The transesterification reaction was carried out at a temperature of 65°C for 2 hours based on crude ester with 5%-10% (w/w) heterogeneous zeolite catalyst ratio shows the percentage decrease in free fatty acid content of 74.05% for zeolite/NaOH, 75.01% for zeolite/KIO3 and 75.77% for zeolite/KI. Based on the results of gas chromatography analysis, it was found that zeolite/KI catalysts of 77.1591.86%.
The effects of nano-sized montmorillonite on rheological and mechanical properties of natural rubber
Authors: Surya’ I , Khosman H
Published: January 2020

A semi EV curing system was applied for studying the effects of nano-sized montmorillonite on rheological and mechanical properties of natural rubber (NR) composites. The montmorillonite as a nano-sized filler which was added into NR at 2.0, 4.0, 6.0, 8.0 and 10.0 parts per hundred rubber (phr). It was found that the montmorillonite functioned as a co-curing agent and reinforcing filler. It decreased the scorch and cure times of the NR composites. The higher the montmorillonite loading, the shorter the scorch and cure times were. It also increased the torque difference, tensile modulus and hardness but decreased the elongation at break. The tensile strength was improved up to an 8.0 phr. of montmorillonite loading.
Utilization of sensor TGS 821 as hydrogen detection of result water electrolysis process in real time with DAQ on PC
Authors: Suryanto Bambang , Nasution Tulus Ikhsan , Sebayang Kerista , Khanifah Siti
Published: January 2020

The world’s energy needs from year to year, as well as giving a bad impact on the increase in the concentration of greenhouse gases and other pollutants. So, that it becomes a major problem of the world today. Therefore, need to do research to find other renewable energy sources, including the utilization of hydrogen gas. Hydrogen gas can be produced from water electrolysis process. To detect hydrogen gas resulting from the electrolysis process can use sensor TGS 821 is done in real time by using the DAQ is connected to PC. Retrieval data on electrolysis process is performed by variation voltage; apply 9 V, 11 V, 13 V, 14 V, 15 V for the electrolysis using filters. With the hydrogen-based zeolite filter was the ability to increase the power of hydrogen adsorption on the filter through the electrolysis process. The maximum concentration of hydrogen generated from electrolysis process by using a filter for voltage 9 V is 409.34 ppm, for voltage 11 V is 502.25 ppm, for voltage 13 V is 863.12 ppm, for voltage 14 V is 964.11 ppm, for voltage of 15 V is 737.89.