bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characterization of Calcium Hydroxide-treated Zalacca Fibers for Improving Properties as Reinforcement for Composites
Authors: Raharjo W P , Raharjo W W , Kusharjanta B 
Published: March 2021

Abstract
Chemical treatment is done to enhance characteristics of plant fibers and its interfacial compatibility with polymer matrix. Calcium hydroxide is an environmental-friendly alternative. This research aims to explore the influence of calcium hydroxide treatment on chemical, physical, thermal, morphological, and mechanical characteristics of zalacca fibers as reinforcements for composites. The time of treatment were varied for 24, 48, and 72 h. Fiber content analysis, XRD, FTIR, TGA-DTA, SEM, density, and single fiber tensile testing were performed. The percentage of cellulose was decreased meanwhile hemicellulose and lignin were increased. There was a decrease in crystallinity and crystallinity index after Ca(OH)2 treatment. The treatment induced some chemical groups correlated to the slight increase of lignin and hemicellulose percentage. There was an improvement of thermal stability of the fiber up to 200°C. The observation using SEM revealed that there were cleaning and roughing effect on fiber surface. There was no significant change in fiber density due to the treatment. However, the tensile strength and elastic modulus were improved after Ca(OH)2 treatment but the decline happened in a longer time of treatment. Accordingly, Ca(OH)2 treatment up to 24 h is appropriate in enhancing the properties of zalacca fibers as composite reinforcements.
Prediction of the Hydrodynamic Performance of an Elliptical Blade Savonius Turbine using Computational Fluid Dynamics
Authors: Yusvika M , Sutaji A , Prabowo A R , Imaduddin F , Hadi S 
Published: March 2021

Abstract
Electricity is a renewable energy source that can be generated from natural energy resources. savonius rotor is a type of turbine which produces small-capacity electrical energy using the kinetic energy obtained in the water flow. The main driving force in this paper is to predict the hydrodynamic performance of elliptical blade savonius hydro turbines with computational fluid dynamics (CFD). A 3D unsteady simulation will be conducted using ANSYS-CFX 19. The elliptical blade profiles with vertical axis turbines are performed at different blade numbers of 2, 3, and 4 blades. The performance analysis results show an improvement in the coefficient performance value of the elliptical blade compared to the conventional semi-circular blade. Based on the results, the more appropriate results obtained at TSR 1.069 for three elliptical blades with a power coefficient value of 0.738.
Fabrication and Characterization of PLA/Nanocrystalline Cellulose Nanocomposite Filaments for 3D Printing Application
Authors: Kusmono  , Wiratma O E R 
Published: March 2021

Abstract
3D process is an additive manufacturing process widely used due to its low cost, high production rates, and ease process. One of the thermoplastic materials commonly used is polylactic acid (PLA). However, PLA has some weakness including low strength and thermal stability. To improve these properties, the addition of the reinforcement materials into the pure PLA must be done and nanocrystalline cellulose (NCC) is one of the potential reinforcement materials. The influence of NCC addition on the tensile and thermal properties of PLA/NCC nanocomposite filament was investigated. NCC was isolated from the ramie fibers using sulphuric acid hydrolysis. Dried NCC powder and PLA pellets were hand-mixed with different NCC concentrations of 0, 1, 3, and 5 wt%. The filament was prepared using a single-screw extruder machine at 185°C under the constant speed. It was found that the diameter of the filament was lower than that of the nozzle of the extrusion machine. The addition of 1 wt% of NCC into the pure PLA increased the tensile strength by 19.04% (from 48.41 to 57.63 MPa) and elastic modulus by 13.47% (from 1791.62 to 2033.07 MPa). The addition of NCC more than 1 wt% decreased the tensile strength and elastic modulus. The optimum NCC loading was achieved at 1 wt%. The presence of NCC had no a significant effect on the thermal stability of the pure PLA.
Numerical Analysis of Heat Transfer Improvement in Flat Tube Car Radiator by Using TiO2/Water Nanofluids
Authors: Kristiawan B , Wijayanta A T , Yaningsih I , Budiana E P , Hadi S , Himawanto D A 
Published: March 2021

Abstract
This research investigated two-phase heat transfer numerically using TiO2/water nanofluids to enhance the thermal performance in a flat tube car radiator. Nanofluid is a colloid dispersion in a nano-sized which is a breakthrough in terms of the thermal devices. The radiator is widely used in the automotive industry as a heat exchanger. The enhancement of thermal accomplishment was studied numerically by analyzing in thermohydraulic characterizations. A numerical study was conducted by TiO2/Water nanofluids using five concentrations consisting, that is, 0.05%, 0.5%, 1.0%, 3.0% and 5.0% and six Reynolds number variations. Nanofluids with volume concentrations of 0.05%, 0.5%, and 1.0% volume concentration indicated that the values of Nusselt number were lower compared to water. Meanwhile, the values of Nusselt number for nanofluids with volume concentration of 3.0% and 5.0% were higher than water. This occurs because the transfer coefficient enhancement was higher when compared to the increase of thermal conductivity.
Investigation of Ecohouse through CFD Simulation
Authors: Sari D P , Gunawan I , Chiou Y S 
Published: March 2021

Abstract
Natural ventilation and raised floor can be found in many traditional houses throughout Indonesia. Moreover, this concept currently applied for modern Javanese house called Ecohouse. The Ecohouse is a prototype single-family house with a raised floor, open plan, located in Cibinong, Indonesia. The investigations were made with the CFD DesignBuilder software package. CFD simulation is conducted to simulate wind behavior and the temperature of the buildings. Ventilation in the house is studied during the summer months. This research has found that the natural ventilation and raised floor of Ecohouse is the potential to provide thermal comfort inside the house. Flow patterns show raised floor and horizontal fin on the roof can reduce the heat store in the room. The result of the study will become a reference to optimize the performance of Ecohouse before applied it as a government recommendation for a residential house in Indonesia.
Modeling and Simulation of MISO-Buck Converter Using ANFIS on DC Microgrid Distribution System
Authors: Anggraini R P , Efendi M Z , Murdianto F D 
Published: March 2021

Abstract
Currently, the development of the utilization of renewable energy sources such as solar energy and wind energy has increased significantly. Interconnecting grid with renewable energy sources combination is developed to increase power and reliability of the system. However, when the energy sources are combined there will be many configurations of power distribution from each source, moreover the power produced by the renewable energy is fluctuating while the load requires a stable voltage and energy continuously even though the supply sources is changes. Therefore, Effective energy management is required to regulate the power distribution of both energy sources automatically that can provide energy to the load continuously and optimally. In this paper a MISO- buck converter is proposed to combine several energy sources using ANFIS. The simulation results show that ANFIS can maintain the output voltage with a very small minimum error percentage only 0.023% and can achieve a faster settling time of 4.032 ms if we compare with PID that is 1.489% for the error percentage and 12.308 ms for the settling time.
Binerization of Panoramic Dental Image for Dental Anatomy Identification
Authors: Fatkhurrozi B , Setyowati I , Nurhayata C R 
Published: March 2021

Abstract
Dental image is used for identification of a person because it can provide a lot of information about dental such as tooth contour, tooth position, and tooth shape. This research aims to process dental panoramic images in the form of greyscale images into binary images. Converting the greyscale image to binary is known as the thresholding process. The thresholding process is also called binerization. The input data used in this study is in the form of dental anatomical images produced by dental panoramic devices. The data used were 20 images, namely 10 abnormal dental images and 10 normal dental images. Results for the identification of dental anatomy with binerization the system and the manual calculation are the same. Identification normal dental are 50% and abnormal dental are 80%.
Utilization of Information System in Dies Control for Improvement of Quality and Production Efficiency in Manufacturing Industry
Authors: Pramono S , Yulia H , Jati B D , Ramelan A , Saputro J S 
Published: March 2021

Abstract
Utilization of Information Systems in Dies Control for Improvement of Quality and Production Efficiency in Manufacturing Industry is a system that is used to anticipate damage to dies before the dies are used, because if a damaged dies is used will be very detrimental to the company. There are 4 views: Dies master, Entry production, Dies maintenance and dashboard. Dies master is a page used for initial dies data input. Entry Production is a page that is used to input daily production output because from this page you will get actual OK production data and actual NG production which will be used to compare between the maximum use of dies and the number of actual OK production and actual NG production. If the sum of the actual Production OK and the actual NG production is greater than the maximum use of dies, the dies must be maintained immediately. Maintenance Dies serves as input data for maintenance Dies, in the maintenance dies page there are also 3 features: Entry Maintenance Dies functions as a date data input menu and only comments mainly because other data already exists on the master dies, Summary on Maintenance dies serves to display the date or last maintenance date and the last maintenance time interval with today, the Details on the Maintenance Dies function displays all dates if the summary only shows one last date the details display all dates, so you can find out how many times the dies have been maintained. and the last is this Dashboard function to display the results of all data that has been inputted. The main function is to display the status of dies, it will be seen if the red color of the dies has to be fixed, if the yellow color is warning because the number of hits is 90% of the maximum result of using dies, if green can still be used.
Root Cause Analysis of Fires in Coal Power Plants Using RFMEA Methods
Authors: Nugroho M J , Bahartyan E , Raymond R , Hidayat B , Irawan M I 
Published: March 2021

Abstract
Fire is one of the highest risks in using coal as fuel for electricity generation. Coal fires often occur in the area of coal handling facilities and are caused by equipment damage, accumulation of coal dust that has not been cleaned and burning coal itself. This study aims to find out how the application of the RFMEA (Risk Failure Mode Effect Analysis) method for the analysis of the root causes of fires in the Pacitan Coal Fired Power Plant case study uses a quantitative approach to find the root causes of prevention by respondents. from PT. PJB UBJOM Pacitan at manager and supervisor level. In implementing RFMEA, the severity, events, and detection are needed to produce risk level figures which will be used as a step in determining the priorities of the company’s mitigation management. Based on this study, 15 types of equipment failures were found at the operational coal handling facility at PT PJB UBJOM PACITAN. By using the RFMEA method, 1 type of critical failure can be found that requires more attention from management to mitigate the risk immediately, namely dust on coal both from barges and coal yards with risk value 32.05.
Optimization of Sedimentation System through AHP and AHP-TOPSIS Methods in Water Treatment Steam Power Plant
Authors: Feriyanto Y E , Zulfikar S P , Dedy  
Published: March 2021

Abstract
Steam power plants consist of systems such as Water Treatment Plant (WTP), boiler, turbine-generator, and balance of plant. WTP system consists of sedimentation, desalination, and demineralization. The coagulation mechanism triggered by the mass grave of suspended solids during the sedimentation process, and if it is less than optimal, so will be modified by injecting coagulant-flocculant chemicals. The most common problem is the high dose chemicals used in the rain and tidal sea conditions. However, the output water quality that produced still does not reach the standard requirements. This condition would affect the high costs of water treatment operations. It also would have an impact on the poor feed the next system. The jar-testing technique is research using process and operational variables that theoretically influence the efficiency of the coagulant-flocculant such as doses, setting times, and rotates agitator. Evaluation of experiments using water quality criteria and data results processed by AHP and AHP-TOPSIS. The sensitivities of both methods are analyzed thus compared to select a consistent alternative that obtained sequence the first alternative for D60W30P80 and the second alternative for D40W20P80. The optimal sedimentation process could potentially save 40-60% of the water treatment operational cost while operating conditions achieved.
Re-design and Upgrade Bearing Materials Traveling Drum Screen in Muara Karang Combined Cycle Power Plant Block 1
Authors: Kurniawan A , Kusuma E 
Published: March 2021

Abstract
The cooling system in the Steam Turbine Generator (STG # 1.0) is adjusted to the cleanliness conditions of seawater, using Traveling Drum Screen (TDS) as a filter. In January 2019, Traveling Drum Screen (TDS) suffered bearing and fuse bolt damage until STG # 1.0 was stopped with a potential loss of 28.59 billion rupiahs. The position of the TDS bearing below the surface of the sea makes monitoring difficult. To overcome the problems in TDS bearings, an innovation was made in the form of redesign & upgrading bearing materials. The replacement of TDS bearing material from Pertinax to Pokhout Wood (Lignum vitae) is very appropriate because the material is capable of self-lubrication in seawater and has more strength. In addition to upgrading the material, a redesign of the bearing is also carried out, which is adding a grease groove so that the optimal lubrication process and use finite analysis software to find out safety factors design. By using simulation software, the results show the bearing design with Pokhout material has a safety factor of 1.28 and Pertinax has a safety factor of 0.85. This shows that the re-design and upgrade of materials that have been carried out can increase the safety factor bearing and can reduce the possibility of failure of the bearing.
Study of Counterweight Addition to Improve Structural Stability of Ship Unloader at Pulang Pisau CFPP
Authors: Huda K , Safii A , Priyono A 
Published: March 2021

Abstract
The ship unloader at Pulang Pisau CFPP is a crane type machine that is used to transport coal from barges to stockpile. This machine uses slewing bearing as component that support for slewing movement to transport coal from the barge to the belt conveyor. Meanwhile this machine also has boom that moves up and down to lift the coal towards to the hopper provided. Several times the slewing bearing was damage with the failure mode is lifted up the inner race bearing and causing the roller inside damaged. Investigation and testing are carried out to find out the strength of the structure and what are the forces that acted. From the results of the investigation and testing, it was found that the ship unloader suffered excessive moment in the front side (boom side), thus making the bearing was fruquently damaged. And the limitation about lifting angle of boom is considered. This study tries to find the balance of forces, moments, and lifting angle, and then to add a counterweight that are sufficient to reduce the impact of the unbalance moment with limitation of boom lifting angle. With the addition of counterweight and limitation angle of boom make the moments are more stable to the structure, and so the lifetime of slewing bearing is longer.
Failure Investigation of Repetitive Crack on MW-701D Gas Turbine Exhaust Manifold
Authors: Laksana W A , Santosa A , Suwarno  , Swastika P A , Dhimas N C 
Published: March 2021

Abstract
A gas turbine power plant is the best choice for peak load conditions in power generation. As we know using gas turbine need less time to start and stop operation than a coal-fired power plant. In East Java, Indonesia has 9unit Gas Turbine Power Plant, which usually operates in peak load conditions. In this paper, a study will carry out an investigation based on maintenance data history which since 2010 founded repeatedly crack in the exhaust manifold. Failure Investigation in the exhaust manifold has been carried so that repetitive crack can be handled in the future. The crack location was mapped to found the root cause of failure. Fuel consumption and operation condition was analyzed to find the cause of the crack. Analysis with fluent software found that streamline of flue gas makes a turbulency in the spotted area. Material selection and design no free expansion in the exhaust manifold increase possibility of failure.
Determination of VAR Compensator Placement for System Stability Improvement on Java Bali Network
Authors: Apriyanto A E , Virgiawan A R , Pariaman H , Hisjam M , Hariyanto N 
Published: March 2021

Abstract
Quality of a power system network can be evaluated from its voltage performance. There are several bus/substation of Java Bali networks that frequently operate in unsatisfied voltage level. As an important part of Indonesian electricity system, quality improvement of this network should be sustainably maintained. The occurring problem can be solved by reactive power compensation. Compensation can be done by installing reactive power compensator into the network. To get an optimal improvement level of voltage performance, the installation location of reactive power compensator must be carefully selected. The selection process can be done by consider the operating voltage, bus sensitivity factor, power angle sensitivity factor and geographic location factor on each location in the network. With consideration of these parameters then the optimal location and configuration of the reactive power compensator can be obtained.
Using fuzzy sampling survey to explore the factors influencing regional cooperation: Changsha-Zhuzhou-Xiangtan case
Authors: Li Chaojun , Chang Kuo Kuang , Ou Shih Ming 
Published: March 2021

Abstract
A comprehensive and profound understanding of the factors influencing regional tourism cooperation is the key to promoting regional tourism cooperation and is the leading condition for deepening the study of regional tourism cooperation economic incentives and cooperation mechanisms. Based on the literature review, a conceptual framework model for analyzing the factors influencing regional tourism cooperation was constructed, and these factors were systematically classified and analyzed. Using fuzzy sampling survey, we distinguished the endogenous and exogenous factors influencing regional tourism cooperation. After the data we collected was processed, we found that economic factors and simple cost-benefit analysis were very important in the start-up phase of regional tourism cooperation; however, as cooperation advanced, the factors that hindered and promoted tourism cooperation should be analyzed in a larger context. At the end of the article, the new organizational economics theory was used to explain this phenomenon, and the basic countermeasures for promoting regional tourism cooperation were put forward.
Integration of intelligent diagnosis system and augmented reality for electric motors
Authors: Lin Yu Ching , Kan Heng Chuan , Lu Jian Ming , Yao Chih Min , Liao Yu Chia , Chung Chun Hui , Shih Kai Chung , Tsai Mi Ching 
Published: March 2021

Abstract
With the rapid development of industrial automation technology, electric motor control has also become an important technology. However, motor failure has many possible causes, and it is not easy to detect in advance. Therefore the fault diagnosis is an important issue for motors. The augmented reality (AR) technology is also developing towards various industrial and educational application in recent years. This research is focused on developing the intelligent diagnosis system and AR application for electric motors. The intelligent diagnosis system applies cloud data management and machine learning methods to predict the health status of electric motors. And the time-recurrent Long Short-Term Memory (LSTM) neural network algorithm is applied to establish a motor health diagnostic model. The experimental results show that the motor diagnosis method can predict the health status of motor effectively. The proposed system will also provide more industrial application services in the future.
Optimal perturbations in viscous channel flow with crossflow
Authors: Chen Cheng , Huang Jiang-Tao , Zhang Wei-Guo 
Published: March 2021

Abstract
This work is devoted to the studies of optimal perturbation and its transient growth characteristics in the Poiseuille flow with Reynolds number R = 1000 and with crossflow. The crossflow Reynolds number R

v
, based on the uniform velocity in the negative normal direction, is varied from 0 to 200. The numerical result shows that the crossflow enhances the transient growth for three-dimensional disturbance case when

R
v

<
17.9

. Seen from the contours of optimal energy growth in the wave number plane, the optimal perturbation that corresponds to the peak value of optimal growth becomes oblique perturbation, when crossflow is introduced. The corresponding streamwise wave number α

P
increases continuously with increasing R

v
, while spanwise wave number β

P
drops firstly with increasing R

v
and later increases. The comparison of exponential growth and transient growth is performed. It is observed that exponential growth becomes profound and even predominant over transient growth after a short period when the crossflow is sufficiently strong. Moreover, the mechanism of transient growth is discussed and it is found that the uniform crossflow can not cause transient growth in the absence of shear in basic flow. With increasing R

v
, the Orr mechanism becomes more and more important relative to lift-up mechanism for the transient growth of optimal perturbation.
Electrochemical performance comparison study of ternary RGO/ß-Ni(OH)2-CeO2 nanocomposite prepared from hydrothermal and solid-state methods for supercapacitors
Authors: Godlaveeti Sreenivasa Kumar , Jangiti Sravani , Bharatiya Debasrita , Somala Adinarayana Reddy , Sana Siva Sankar , Nagireddy Ramamanohar Reddy 
Published: March 2021

Abstract
In this paper, a novel ternary RGO/β-Ni(OH)2-CeO2 nanocomposite (NC) was synthesised through facile, one-step hydrothermal, and solid-state methods. The structural, morphological, and elemental composition analyses of powder composites were characterised by various techniques such as XRD, FTIR, TEM, and EDX. The electrochemical performance of RGO/β-Ni(OH)2-CeO2 composites prepared by hydrothermal and solid-state methods coated on Ni foam in presence of 3 M KOH an aqueous solution was studied through CV, GCD, and EIS techniques. The specific capacitance of 788 F g−1 achieved at a current density 0.5 A g−1 was observed for the SSM-2 sample at 250 °C calcination temperature as a result of the synergic effect and combination of RGO, β-Ni(OH)2, CeO2 compounds. The obtained electrochemical results show that the present novel ternary RGO/β-Ni(OH)2-CeO2 working electrode fabricated from the solid-state method is suitable for the next generation supercapacitor applications.