bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of Sustainable Value Stream Mapping to Improve the Sustainability Indicator: Case in MDF Company
Authors: Atoillah Farkhan , Hartini Sri 
Published: April 2021

Abstract
Plywood production is a complex process. Because it uses wood as raw material, then causes several activities involved in it, including forest cutting, has relatively little efficiency, produces waste, and the level of occupational safety and health has not been considered. Therefore to get sustainable manufacturing, it is necessary to pay attention to several aspects, including economic and environmental factors. And social aspects. This study aims to design the three mentioned aspects for sustainable-VSM in plywood companies. Sustainability indicators of his study by performing a literature study and validating it by in-depth interviews with its top management. The study results are time efficiency level was 81%, the quality level was 93.5%, the material consumption efficiency level was 59.3%, and the worker health level was 75.75%. This study also recommends potential solutions that are expected to improve the sustainability performance of the plywood company.
The Influence of Carbon Particle Size in The Carburizing Process of ST-40 Steel to The Surface Hardness
Authors: Ngafwan  , Anggonor Agus Dwi , Pramanda Wibi , Purnomo  
Published: April 2021

Abstract
This research aimed to determine the changes in the microstructure that occurred and changes in the hardness value of the steel surface. This research uses ST 40 steel and carbon powder with an average area of carbon particles 115,103µm
2 and 515,735µm
2. Steel and carbon were put in a closed container and heated at 780oC for 4 hours. After the carburizing process, the particle area was reduced to 110,051µm
2 and 440, 058µm
2. Raw material yields an average solubility of elements in Fe (β%) 5.99%. The solubility of the carburizing material element is higher in the smaller carbon grains. Likewise, the result of surface hardness after the carburizing process is harder by using small carbon granules.
Bioreactor Design For Solid State Lignocellulosic Hydrolysis: A Review
Authors: Mulyaningtyas Akida , Sugiharto Agung 
Published: April 2021

AbstractEnzymatic hydrolysis of lignocellulose to produce reducing sugars to be used as bioethanol raw material has recently attracted many scientists’ attention to investigate. It needs to be performed on a big scale, so it is essential to select an appropriate bioreactor. This work discusses enzymatic hydrolysis in solid-state. Solid hydrolysis is suitable for the growth of filamentous fungi to produce hydrolytic enzymes. A bioreactor is the heart of the process since the chemical reactions take place in it. In biochemical reactions, bioreactor plays two complementary functions, i.e., the reaction holder and the place for microorganism to grow. Therefore, to design a good bioreactor, these two functions should be considered carefully. Besides, we also developed a bioreactor with a continuous air supply to provide oxygen for hydrolytic fungi.
Design and build a head circumference measurement system for toddlers
Authors: Martono Kurniawan Teguh , Nurhayati Oky Dwi , Indrasto Erwan Yudi , Adhy Satriyo 
Published: April 2021

Abstract
Growth and development are events that every living thing will experience. These events are two events, namely growth, and development. These two events are related to one another, where growth refers to a change in the shape of the body, or cell size and effect change an organ or limb’s function in its operation. Every parent must consider child development because this will significantly determine and influence how the child develops in the future. Measurement of height, weight, or head circumference is carried out at the Posyandu to aim that the development of children under five in an area can be monitored and make it easier to determine policies. The results of this measurement will later be recorded on a card called the “Kartu Menuju Sehat” (KMS). Technological developments bring about considerable changes in the world of health. This paper discusses the design of a head circumference monitoring system. The use of a rotary sensor is an option in designing a head circumference gauge. The measurement results using a rotary sensor show that the measurement accuracy is 100%. Testing the system with a black box shows that 100% of the structure built is acceptable and according to the design scenario.
Exergy Analysis of Self-Bed Feedstock in Rice Husk Bubbling Fluidized Bed Gasifier
Authors: Safitri Kania Amelia , Pramono Mummayiz , Dafiqurrohman Hafif , Surjosatyo Adi 
Published: April 2021

Abstract
This study will use the result simulation of bubbling fluidized bed gasifier (BFBG) in CFD to know the value of producer gas (CO2, CO, H2, CH4, O2, and N2). Commonly in BFBG silica sand is used as bed material in the gasification process but in this study silica sand or bed material is absented in the gasification process. The energy and exergy analysis will be evaluated in this study to indicate the performance of BFBG without bed material. In this study rice husk is used as a feedstock with feed rate 0.2 kg/s, and air is used as medium gasification in the range of ER (equivalence ratio) between 0.24 to 0.45. Variation of ER affect the value of energy and exergy, where the higher ER applied the higher exergy destruction that occur and decrease the efficiency of exergy. It was calculated that the best efficiency was obtained when the value of ER is 0.24, with the total value of energy and exergy are 2544 and 2335 kJ per kg biomass, sequentially.
Process Simulation of Inverted Downdraft Gasifier for Tar Reduction Using in Situ Process
Authors: Akbar Maha Hidayatullah , Sanjaya Yohanes Bobby , Dafiqurrohman Hafif , Muharam Yuswan , Surjosatyo Adi 
Published: April 2021

Abstract
Biomass gasification is a topic that is currently popular technology which convert biomass to another form of energy. Unfortunately, gasification has many challenges specially to reduce tar in significant amounts which will be discussed in this journal. Regular updraft gasifier can produce 10%-30% volatile tar while many gasifiers produce so much tar that gas cleaning cost is more than the actual gasifier. In-situ method is used for reducing tar amount inside the reactor. One of the solutions is inverted downdraft gasifier implementation, which typically produces much less tar, about 1-5%. In this research, the inverted downdraft gasification was simulated by Aspen Plus which provides an overview optimal condition for less tar syngas. The result gives us highest value of syngas, 6,05 MJ/Nm3 for Coal and 6,24 MJ/Nm3 for MSW(Municipal Solid Waste) which both of them have ER 0,20. In Aspen Plus, we can discover several main parameters that can be done by finding both mass flow rate and contents in syngas which contains CH
4, H
2, CO, CO
2, O
2, H
2
S, N
2 and H
2
O.
An optimization model of variable size two-dimensional nesting with stacked sheets and usable leftovers for the CNC routing process
Authors: Aribowo Wisnu , Ali Irfansyah , Sukoyo  
Published: April 2021

Abstract
The research is motivated by a problem in the aviation industry, where nesting is performed to allocate and arrange parts in metal sheets for a CNC router machine. In addition to the usual objective to minimize material waste, the nesting problem has a few characteristics, i.e., variable sheet size, stacked sheet routing, and usable leftovers. The three aspects are integrated into an optimization model developed from the fundamental two-dimensional bin packing problem. A simple numerical example is given to show the capability of the model and the characteristics of the results.
Optimation Condition Operation of Distillation to produce 2-EHA using ChemSep Version 8.23
Authors: Fahmi Abyadh Basyari , Sugiharto Agung , Fatoni Rois 
Published: April 2021

Abstract
A new methodology for optimation column distillation process has been developed not only by manual calculation but recently technology take in the forward and improving of any simulator available to use. Sophiscated technology of simulator has been used for this optimation as well as Aspen Hysys is available for obtaining the best way of production plant. Simulator use a variety of thermodinamics calculation to operate and it depends on the type of distillation, phase of the components and operation condition of the simulation. In this paper, a critical review of optimation condition concern to utilize simulators capability including selection of thermodynamics property packages, test of several variable operation condition especially on the temperature and pressure also the combining and correction the value of the composition polymerization of acrylic acid. For future project commissioning of industrial plant make use of the simulator such as Aspen Hysys is highly recommend to hold significant potential and great promise for further evaluation, development and application.
Effects of Solar and Wind Power Energy Sources Integration on Frequency Dynamics in Microgrid
Authors: Perinov  , Hudaya Chairul , Sudiarto Budi , Garniwa Iwa 
Published: April 2021

Abstract
The need for electricity that continues to increase requires increasing electricity generation capacity and building comparable transmission and distribution systems and a smarter system for dealing with increasingly complex forms of electricity production and consumption. Renewable energy, such as solar and wind, are ones of the solutions to increase electricity generation capacity but has problems with its intermittent and other grid related problems, which can be solved by using Power Electronic Interfaces (PEIs), i.e., Battery Energy Storage Sytems or converter of renewable energy sources (RES), to keep the quality and stability of the power system. However, the increasing penetration rate of RES, which gather several different types of energy sources and generations system, in an electrical power system will make need a more complex system control. Objective of this research was to study the effects of RES integration on frequency dynamics in microgrid to further develop and increase its stability and quality by modeling and simulation using MATLAB/Simulink software.
Feasibility of Composite sPEEK-PVA as Proton Exchange Membranes
Authors: Hidayati Nur , Imannurya Praminta Cindy , Sara Alisa Mutia , Nastiti Elisa Putri , Harmoko Tri 
Published: April 2021

Abstract
The present work deal with the fabrication and characterizations of composite membranes composed of sulfonated poly (ether ether ketone) with polyvinyl alcohol and reinforced with cesium phosphotungstic acid (Cs-HPW), graphene oxide (GO), and silica-carbon nanotube (SCNT). Compared to the blank sPEEK-PVA membrane, the uptake of composite membranes in water varies at around 30-50%, while the swelling ratio is increased. The addition of Cs-HPW, GO, and SCNT reduces the tensile strength and methanol permeability. The ionic exchange capacity slightly varies at around 0.48-0.70 meq/g. From the above studies’ viewpoint, the prepared composite membranes still need to be reviewed so that these membranes are feasible as proton exchange membranes.
Simulation Design of Ungaran 500kv Substation Operation System Using Microcontroller
Authors: Darjat  , Windarto Joko , Prasetyo Juvena 
Published: April 2021

Abstract
Extra High Voltage Substation 500 kV is one part of the backbone of the electrical system in Indonesia, this happens because it supplies so many areas. In terms of these benefits it can be seen that the equipment in the substation must have high reliability so that the quality of electric power reaches the consumer optimally and consumers will not feel disadvantaged. Operation of a switching device at the substation to make changes to the system is called maneuvering. In the implementation of the substation maneuver, it must be in accordance with the Standing Operating Procedure (SOP), if a switching error occurs when the maneuver will be fatal for the electric power system and can cause harm to the company and consumers. Therefore we need a safety in the substation maneuvering process called interlock. In this final project, a simulation tool is made to apply the working principle of the interlock system to CB and DS in maneuvering voltage relief, voltage delivery maneuvers and load-based maneuvers based on the Arduino Mega 2560 as the central controller for the entire system circuit. This simulator tool has a fairly high level of work accuracy in accordance with SOP (Standing Operating Procedure). It is hoped that this tool can provide knowledge to the general public about the existing maneuvering system in the GI in maintaining electric power transmission systems well and easily understood.
Lecturer and Student Attendance System with RFID
Authors: Renaldo  , Aribowo Arnold , Putra Alfa Satya 
Published: April 2021

Abstract

Purpose: Manual recording of lecturer and student attendance at a university may potentially create inaccurate attendance recording. Particularly, manual attendance cannot accommodate the need for real-time attendance recording. Thus, this paper discusses on the design of a real-time attendance recording system by utilizing Radio Frequency Identification technology (RFID). Methodology: The proposed attendance recording system is built using Arduino Uno microcontroller, RFID reader MFRC522, and Node.js that runs on a personal computer. To identify each lecturer and student, every one of them is associated with a unique identifier called UID. Upon detection of valid UID, the system can determine whether a lecturer or a student comes late to the class or not in real-time. Any event of lateness will be identified as a violation of the university policy. In addition to that, the system is able to store various information related to the courses in the university, and also send email notifications through a PHP application. All necessary data required by the system is managed by MySQL. Results: Based on the tests conducted, data entry to the database, RFID reading, and lateness checking is determined to work as expected. RFID reading from the same card occasionally gives a different UID being read, which may be due to failure in the RFID reader or RFID tag. Time accuracy test on lateness recording gives only 80% accuracy, this inaccuracy is suspected to be the result of the unstable Internet connection between PC and database. Applications/Originality/Value: This attendance system is developed to conform with Pelita Harapan University’s policies on lecturer and student attendance in class. It is hoped that this system can be considered as an improvement to the current attendance system at Pelita Harapan University.
Design, building and performance testing of GPS and computer vision combination for increasing landing precision of quad-copter drone
Authors: Supriyono Heru , Akhara Amnaduny 
Published: April 2021

Abstract
This paper discusses the effort proposed for increasing accuracy of autonomous landing of quadcopter on available landing pad by combining GPS and computer vision. The main objective of this work is to recognize and to capture image from landing pad and then used it for controlling quad-copter during landing mode along with global positioning systems (GPS). The work were including design and building hardware and software of quad-copter using commercially available instruments and then tested its autonomous landing performance on predetermined landing pad. The landing pad is in the form of 3 circles black and white with similar center point on it, i.e. the inner circle (the smallest one) has radius of 25 cm, The second inner circle (the middle circle) has radius of 60 cm and the outermost circle has radius of 100 cm. The landing pad image was captured in real time and then was processed by using Canny Edge detection method involving steps, i.e. converting RGB image to grayscale, removing noise by adding blur, finding contour of image and then finally using centroid method to get center coordinate of landing pad. Testing was carried out in the outdoor environment in the sunny-day condition. Flight test was done by comparing the precision of autonomous taking off landing of quad copter using GPS only and GPS combined with computer vision algorithm on altitude 5 meters. The test results showed that landing error of quad-copter by using GPS only was 199.2 centimeters in average from the centre point compared to 42.2 centrimeters when quad copter using combination of GPS and computer vision technique.
Development of Work Breakdown Structure (WBS) for Safety Planning on Tunneling Work Projects Based on Risk
Authors: Nugroho Danang Budi , Latife Yusuf 
Published: April 2021

Abstract

Purpose: Along with advance era and technology, tunnel construction is the alternative infrastructure that can be used as an option, especially in difficult terrain conditions. The tunnel work project is a series of very complex activities. Work activities that are not supervised, causing the risk of these activities neglected. This has become one of the causes of workplace accidents. The risk of work accidents can be prevented by early identification and analysis of potential hazards in each of the activities listed in the project WBS. Therefore, the existence of WBS is needed in presenting a risk assessment, probability and impact arising from the work accidents. The aim of this study is to develop a standardized WBS for safety planning on tunnel construction work based on risk. The standardized WBS will be a main input for identify potential hazard risks and producing risk responses. Methodology: The method that will be used in this research is a qualitative approach with a survey and deep interview to experts. Results: The results of this study are standardized WBS, potential hazard risks and the developed of WBS standard for safety planning, as a step to prevent work accidents in tunneling work projects. Applications/Originality/Value: The implementation of this research is for the contractors who are required to make safety plan, especially in tunneling work projects.
The potential recovery energy of SWD (sea water desalination) by SGP (salinity gradient power)
Authors: Budi Suka Handaja , Susanto Heru , Hermawan  
Published: April 2021

Abstract
Fresh water is needed in industrial activities. For these needs sea water is usually used as raw material if the plant is near the sea and far from the river. SWD (sea water desalination) is used to process sea water to fresh water, that is by reducing levels of salinity or reducing levels of total dissolved solid (TDS). There are two technologies in SWD, namely thermal distillation and reverse osmosis (RO) membrane technology. Residual SWD process or also called blowdown water has high salinity levels can be converted into electrical energy through SGP (salinity gradient power). There are two technologies to capture energy from salinity differences, namely PRO (Pressure Retarded Osmosis) and RED (Reverse Electrodialysis). PRO and RED are renewable energy technology, there are no emision, no moving part, abundant availability in nature and can be recycled. In this article, an analysis for SWD of oil refinery is carried out. From the analysis results it is known that the plant uses thermal distillation technology, requires power as 64.25 MW and 3,403 m3/h seawater to produce 242 m3/h freshwater. With SGP, the potential recovery of power gained is 0.786 MW. This recovery potential is still too small when compared to energy requirements of SWD with thermal distillation technology, but if it use RO technology that only requires 3.6-5.7 kWh/m3 or 0.87 - 1.40 MW to produce 242 m3/h, a significant impack to saving energy will be obtained.
Study of Pb (II) adsorption by Tannin Based Adsorbent from mangrove bark (Rhizopora mucronata)
Authors: Sudaryanto Yohanes , Anggorowati Adriana Anteng , Sianto Martinus Edy 
Published: April 2021

Abstract
Mangrove bark (Rhizopora mucronata) is a potential adsorbent for heavy metals adsorption such as lead or Pb (II), because of its tannin content. Prior to be used as adsorbent, the extract of tannin should be polymerized using formaldehyde and produced Tannin Based adsorbent which was not dissolved in water. This research aimed to study the effect of temperature, adsorbent dose and contacting time to % removal of Pb (II). A series of batch adsorption was carried out using 250 mL Pb (II) solution with initial concentration 307.2mg/g. The variation of adsorbent mass was 1-5 gram, the variation of temperature was 30,40 and 50°C, and the variation of contact time was started at 10 minutes until reached the adsorption equilibrium. The obtained data were also required to determine the adsorption kinetic and adsorption isotherm. The maximum percentage(%) removal was 71.6% which was obtained at temperature 50°C, contact time 70 minutes and TBA dosage 4gram/250 mL solution. Study of adsorption kinetic determines that the pseudo-2 order fitted with this adsorption process. The adsorption coefficient was 0.0099 g/mg.min and the coefficient of determination (R
2) was 0.9976. In addition, Langmuir equation described adsorption isotherm better than Freundlich and Temkin equation. The maximum adsorption capacity (qe
) was 18.281 mg/g, Langmuir coefficient was 0.0017 L/mg. The research results can be applied to design and to scale-up the process.
Assessment of Viscous Damper Placement as Passive Energy Dissipation on High-rise Building, a Numerical Study
Authors: Nurchasanah Yenny , Harnadi Muchammad Lextito 
Published: April 2021

Abstract
The methods to reduce the impact of earthquake loads is using a damper, namely passive control, active control, and semi-active. One of the advantages of passive control is because of its simplicity in design, installation, and especially in its maintenance. Viscous Fluid Damper (VfD) is one type of dampers which has been widely applied. A numerical analysis of the seismic response of VfD on the ten-story reinforced concrete (RC) frame that receives lateral loads as earthquake loads already compared to conventional RC frame. Displacement and acceleration are an earthquake response parameter which is a direct impact on the structure. The results of numerical time history analysis with the excitation of the Kobe-X earthquake record show that the presence of structural passive control has succeeded in reducing displacement on the top floor and also on the floors below. On the roof floor, for the X longitudinal direction, there was a reduction up to 7.721 percent. Whereas on the 6th, 4th and 2nd floors the smaller reduction occurred by around 6.624% to 2.932%. Likewise, with the acceleration parameters, generally able to reduce acceleration. For frames with placement of VfD in 1st – 2nd floor can reduce acceleration to 10.293 percent whose data is taken at the top of the building. For further, need an experimental laboratory program to validate the numerical analysis to ensure the prediction behaviour of the structural design.