bluuebunny/crossref_metadata_2025 huggingface dataset:
Potential analysis and community-based sustainable tourism development strategy (a case of kampung menjing, sukoharjo regency, central java, indonesia)
Authors: Wibowo Y A , Ronggowulan L
Published: March 2021

Kampung Menjing has been developed as a local tourism in order to support development of Gayam Village as the new tourism destination. Undertaken by utilizing the potential resources of Kampung Menjing as “rural cultural tourism”. This study concentrated on analyzing the potentials and identifying the problem of those issues, then formulating the recommendation as the problem solving to manage its tourism plan. An observatory-participatory case study approach with comprehensive analysis was used for this research by using attractions, amenities, accessibility, available packages, activities, and ancillarry services (6A) analysis, Strenght, Weakness, Opportunity, Threat (SWOT) as well as matching between potentials and strategies resulted by SWOT/TOWS analysis as the research design. The data was received from indepth interview, small format aerial photograph, and field survey by organizing “total-participation observer”. The result showed Kampung Menjing took possession of three different potentials which has ready to develop as the main factors in order to be rural tourism village, while the development of tourism at Kampung Menjing comprised strategies which can be proposed for developing community-based sustainable tourism emphasized on the community-centered management concept in order to improve the welfare of the community. Moreover, goverment support was needed for development and maintenance funding in particular.
Monitoring of the tourism village of the mount merapi slope area through the global sustainable tourism council (gstc) snapshoot assessment system
Authors: Muhamad M , Saryani  , Khabibi N I
Published: March 2021

The Indonesian government through the Ministry of Tourism has a big agenda related to the development of sustainable tourism destinations, namely Indonesia must be a benchmarking of sustainable tourism in Southeast Asia. The program began in 2015 with the signing of a memorandum of understanding with 20 Districts / Cities as a form of local government commitment to encourage sustainable tourism development. This study is to find out how the monitoring system is carried out in tourism ecosystems, consists of: destinations, local governments and local universities running and in accordance with predetermine Ed standards. The monitoring system in this study focused more on the standards determined by the Global Sustainable Tourism Council (GSTC), namely on the management standards of tourism destinations and environmental management. A monitoring system focused on how tourism destinations attempt to reduce disaster risk. The study location took samples in the southern slopes of Merapi, namely in the Turi sub-district, which is the area that has the most tourist villages among the other sub-districts in Sleman Regency. This study method was carried out through snapshoot assessment and observation through sustainable tourism development indicators consisting of 4 standards, 42 criteria and 102 indicators. Assessment is based on the results of self-assessment. Assessment is given for each element in each standard, where each standard will be given a Likert scale value from 1-7. The criteria used are standard environmental management criteria that are in accordance with the provisions of the determined GSTC, which includes further monitoring with standard D, namely maximizing the benefits for the environment and minimizing negative impacts which consist of: D1 Environmental Risk, D2 Sensitive Environmental Protection, D4 Greenhouse Gas Emission, D11 Light and Sound Pollution, D12 Environmentally Friendly Transportation. Research results indicate that tourism destinations already have standards in destination management and environmental management, but have not carried out overall practices within the framework of sustainable tourism development, especially in standard D.
The tourism impact on the social economic life of community in Ngargoyoso Sub-district, Karanganyar Regency
Authors: Makmun M D M , Muryani C , Wijayanti P
Published: March 2021

Tourism enables many people in Ngargoyoso replacing their livelihood from agriculture to tourism. It brings an impact on the socio-economic activities of the Ngargoyoso community. The research is set to find out the socio-economic activities of the Ngargoyoso community, Karanganyar Regency in the field of tourism, and its impact on the community’s economy. The data is obtained by interviewing respondents conducted in 19 tourism objects using accidental sampling technique. The method of data analysis is a qualitative descriptive analysis. The results reveal that there is an increase in the livelihoods of the community from agriculture to the tourism sector such as traders (restaurants, stalls, traveler merchants, and souvenir traders), parking attendants, and tourism object managers. However, in the land processing and harvest season, the community tends to focus more on the agricultural sector instead of tourism. The impact of tourism activities on the economy of the community is an increase in income of 33 percent after working in the tourism sector. It can improve the welfare of the community. It is due to the number of visitors visiting tourism objects and carrying out economic activities.
Profile and competency of tourist guide on ciletuh-palabuhanratu unesco global geopark
Authors: Yani A , Mulyadi A , Rosita
Published: March 2021

Ciletuh - Palabuhanratu Geopark located in West Java Province was approved as UNESCO Global Geopark (UGG) at the Unesco Executive Board session on April 12, 2018 in Paris, France. A distinctive feature of the Ciletuh - Palabuhanratu Geopark has geological diversity, biodiversity and cultural diversity. This decision is of course an opportunity for people in the Geopark area. One of the people’s responses to the geopark is a tour guide. The purpose of this study is to study the profile and competence of tour guides. The method used is descriptive by conducting interviews and questionnaires. The results showed that mastery of material about Geopark was still low while hospitality in serving tourists was quite good. The implication is that there needs to be an increase to improve the competence of tour guides in the Ciletuh Geopark - Palabuhanratu area.
Land for indigenous people: ownership conflicts and government interventions in kampung Bawong, Perak, Malaysia
Authors: Samsudin S , Ibrahim N A , Suratman R , Adnan M Z
Published: March 2021

Land ownership among the indigenous is lagging despite their special stature and origins in the country. Their nomadic way of life and settlements in the reserved lands for indigenous are among the key factors which hinder their path towards land ownership. In 2005, government initiates to alienate 50 land parcels with house for the villagers of Kampung Bawong, Sungai Siput, Perak. However, current status reported that only 21 landowners still live on site while the rest are abandoned. In view of this, the present study examines the current issues on property rights and how government is responsible in managing the conflicts. The data was collected from interviews and questionnaires. The study analysed several issues on property rights including idle land, tax arrears, and inheritance property. The study found that government also plays its role in managing the conflicts. Hence, in ensuring a way forward for the ingenious people to continue to own their lands in legal, the government might explore the best practice of land alienation for them which include the aspects of legal and financial resources.
Adaptation of Sinarresmi traditional village community life towards the environmental sustainability
Authors: Sugandi D
Published: March 2021

Halimun-Salak mountain slope area was a place of Sinarresmi traditional village community lives and has a wisdom of environmental utilization. This research is aim to; analyze the form of adaptation in farming pattern and community life pattern. Method that used is descriptive with qualitative approach along with author as the instrument. Community ofKasepuhanSinarresmi are still holding the value, norm, belief, behavior. To fulfil the needs of community, they did the planting and harvesting only once in a year with the assumption that soil needs to be rest to bring back the feritility and get rid of pest. Rice seeds that used was produced by themselves with planting lifespan of 5 – 6 months. Land cultivating or even harvesting are not using machine and it was forbidden to be traded. Farming was not use chemical fertilizer, because it could kill the flora and fauna which developed in the rice fields. Life pattern of farming and socializing is always conducted with mutual cooperation. This adaptation behavior makes Sinarresmi traditional village community to have a relatively high of food sustainability.
Model of local wisdom values as an independent and cultured-environment village in bantar karet community, cijalingan village, cicantayan district, sukabumi regency
Authors: Hidayat M , Kembara M D , Mulyani H , Sewu P H
Published: March 2021

Human beings are highly dependent on nature as a means of fulfilling their needs. However, nature is no longer able to fulfill human needs nowadays due to the environmental degradation casued by humas’ hands. Therefore, we attempt to answer the existing challenges by implementing the ecovillage model as previously implemented in Cimaung Village. Similarly, the implementation was also rerun in a different village called Cijalingan Village, Cicantayan District, Sukabumi Regency. This ecovillage model was then implemented by the means of socialization, group formation, group guidance, and group empowerment. The results of the ecovillage model implementation in Cicantayan Village showed that the community was given an understanding and could know the importance of protecting the environment. Besides, this implementation in fact could also change people’s view points regarding inorganic and rubber waste. In the same time, people would become more aware of the importance of creating a good life in harmony with nature as a means of building independent individuals in accordance with the ecovillage principles.
Water quality study as a way of community behaviour in environmental management in east lombok regency
Authors: Widiyanti B L
Published: March 2021

Groundwater is one of the natural resources that must be maintained and managed sustainably well. Groundwater quality monitoring is important to do given the increasing human population that affects the increasing demand for water, both in terms of quality and quantity. Groundwater is susceptible to pollution which will result in a decline in the value of its benefits. The objectives of the research are to analyze the quality of groundwater and community behaviour in densely populated residential areas in East Lombok Regency, West Nusa Tenggara Province. The research method is survey method. Results of groundwater quality testing compared to drinking water quality standard in accordance of PERMENKES 416/MENKES/PER/IX/1990. The results showed that in general if viewed from the physical and chemical aspects, groundwater in the research area is still below the standard of permissible quality, only in biological aspects that far exceeds the standard of non-piped water quality standard. To be able to utilize ground water as drinking water should do the treatment. Community behaviour in managing and maintaining groundwater quality in general is good, but in the future it should be improved.
Hydrogeochemical and groundwater aggressiveness assessment in the epikarst aquifer: a spatial and temporal analysis
Authors: Wijayanti P , Noviani R
Published: March 2021

The ability of water to dissolve rocks, which is indicated by groundwater aggressiveness, controls the rate and extent of the current karstification process. This study aimed to analyze the hydrogeochemistry and characteristics of groundwater aggressiveness in an epikarst aquifer, both temporally and spatially, using seven (7) major ions, namely Ca2+, HCO3−, Mg2+, K, Na, SO4− and Cl− as parameters. These ions were then plotted into a Piper diagram to find out the hydrogeochemical facies of the groundwater. Meanwhile, the groundwater aggressiveness was analyzed in PHREEQC software. Nine (9) springs were each sampled one time for the spatial analysis. As for the temporal observation, seven (7) samples were collected from one spring. The results revealed that the hydrogeochemistry of the epikarst aquifer was composed of Ca2+ HCO3− groundwater, indicating that the limestone (calcite) dominates the lithology of the aquifer. Moreover, temporal variations were detected in the groundwater aggressiveness levels, namely high in the rainy season, but low in the dry season. Spatially, the aggressiveness of groundwater emerging to the selected springs also varied depending on the development of the underlying karst aquifers.
Is flood water safe for consumption at evacuation centre in kuala krai district, kelantan, malaysia?
Authors: Nayan N , Hashim M , Saleh Y , Mahat H , See K L , Khotimah N , Setyowati D L
Published: March 2021

Clean water supply has an important role among flood victims at evacuation centers during the flood. However, the water supply from various unknown and unverified sources such as hygiene status can affect the flood victims health. Therefore, the purpose of this study is to evaluate the flood water quality in the Kuala Krai flooding areas. The methodology of data collection in this study are fieldwork methods. It has been used to collect flood water samples during the northeast monsoon season in December 2016 and January 2017. A total of four flood water stations have been select based on the four flood evacuation centers based on the number of flood victims. A total of 13 water quality parameters were analyzed: pH, DO, BOD, COD, SS, NH3N, turbidity, NO3, Fe, Mg, Ca, Cu and E. coli bacteria. Flood water quality assessment in this study is based on the Malaysian National Water Quality Standards by the Malaysia Department of Environment (DOE). The results showed that flood water quality was in class III which was considered as moderate pollution. This situation explains that flood water needs to be fully treated for drinking water. To ensure the safe water supply for flood victims, a water supply risk management during floods has to be developed to ensure flood victims will have a good clean water supply and reduce the spread of flood-related diseases.
Improvement of Work Method with Eliminate, Combine, Re-arrange, and Simplify (ECRS) Concept in a Manufacturing Company: A Case Study
Authors: Nisa A K , Hisjam M , Helmi S A
Published: March 2021

The study was conducted in a data storage manufacturing company that currently produces more than ten types of hard disk component products both internal and external. Based on observations of their manufacturing lines, it indicates an imbalance in the production line. Balancing the production line minimizes idle time at all work stations. One component of a work system that can be improved is the work method. In this study, work method improvements were carried out by applying the concepts of Eliminate, Combine, Re-arrange, and Simplify (ECRS). The benefit obtained from this research is that the company can improve the work system on its production line based on the improvement of the proposed work methods so that it can ultimately increase company productivity. There is an increase in line efficiency after the improvement. The line efficiency value before and after improvement are 65.62% and 74.43%, respectively.
Realization of Noise Dosimeter Calibration Based on Percentage of Noise Dose Exposure using Absolute Method
Authors: Dwisetyo B , Rusjadi D , Palupi M R , Putri C C , Utomo F B , Prasasti N R , Hermawanto D
Published: March 2021

The application of noise dosimeter in an industrial and construction area has shown an increase in the last decade in Indonesia significantly. The benefit of using this acoustical instrument is having a parameter known as a percentage of noise dose exposure that appropriate for the workers located in a loudness area. Moreover, the industrial necessity related to this instrument calibration quantity tends to increase in recent years. However, the calibration service related to this parameter is not available in Indonesia yet. Therefore, the aim of this work is to realize the calibration of noise dosimeters based on the percentage of noise dose exposure using an absolute method. In this method, it is necessary to apply the insert voltage technique to determine an absolute sound pressure level (SPL), where a whole measurement process is performed in a free field condition. The determined parameter is the percentage of noise dose (D), and time-weighted average (TWA) with SPL of 104 dB and 114 dB. From the result, the deviation value of D between the two devices under test and the reference tends to increase and has maximum values at the frequency of 8000 Hz that the values are 2.2% and 3.7% respectively. Meanwhile for the TWA parameter, the maximum deviation for the first DUT is found at the of 4000 Hz that has the value is 2.4 dB(A), while for the other device is about 4.1 dB(A) at the frequency of 8000 Hz. Besides, these methods are necessary to be implemented for validating the calibration of noise dosimeter using acoustic comparison coupler as a prototype research that still under development.
Redesign of Facilities Layout Using Systematic Layout Planning (SLP) on Manufacturing Company: A Case Study
Authors: Haryanto A T , Hisjam M , Yew W K
Published: March 2021

An effective facility planning can significantly reduce the operational costs of companies. The facility layout problem is relating to location of objects on a given site and the material flow between these objects. The study conducted in a Hard Disk Drive (HDD) manufacturer. In the company, there are several obstacles was found in the Brushing Room. One of the causes of these obstacles can be marked by the alternating flow during the production process of the Tressel parts, one of the products of the company. To correct the problem of the layout of the existing facilities, it is necessary to redesign the layout of the facilities based on the production process flow. The methods used was the Systematic Layout Planning (SLP) method to minimize costs material handling resulting from the production process. Layout suggested using the SLP method succeeded in reducing the material handling costs (OMH) of the production process flow of the Tressel. This can result in savings in the company’s material handling costs, from IDR 5,377,415 per month to IDR 2,971,717 after the improvement were conducted. OMH is reduced by IDR 2,405,698 in each month and resulting in savings of 44.7%.
Design of Fishing Vessel 5 GT for Traditional Fishing Community Activities
Authors: Khristyson S F , Jamari  , Bayuseno A P
Published: March 2021

Develop of fishery port area in the Semarang city, therefore need improve for a fishing vessel design that inaugurated the representative of the port area Tambak Lorok. The vessel was also not equipped with hydrostatic calculations, stability and so on, then most fishermen in Indonesia use wood as a material for the creation of fishing vessels. The purpose of this research is to get design criteria and dimension of fishing vessel and determine the construction design criteria of the right fishing vessel performance in the Tambak Lorok sea area Semarang accordance with IMO (International Marine Organization) standard. Designation of the method as the efforts to produce optimization design output and meet the various criteria required with comparison method using the 5-size main ship dimension, as well as for the design and calculation of criteria with ship design software. This design method requires average size comparative vessel capable of developing and influence the size and speed of 5 GT ship model. The results this design method requires a comparative vessel capable of developing and influence the size and speed of 5 GT ship model. Analysis results of designing fishing vessel show the development of best ideal size on 5 GT ship class to operate in the cruise area shallow water. Practical stability and resistance diagrams to predict ship performance and provides the prediction procedure showing how to develop such diagrams using the available main dimension ship data.
The Effect of Copper-Aluminium Perforated Heat Sink to Improve Solar Cell Performance
Authors: Kusuma A C , Harsito C , Rachmanto R A , Arifin Z
Published: March 2021

Fossil-based energy is diminishing due to the increasing global energy demand. The sun as a renewable energy source can be converted into electrical energy using solar cells. The performance of solar cells is influenced by the operational temperature produced. This article discusses the use of copper heat sink with aluminum fins as passive cooling to reduce operating temperatures to improve the performance of solar cells. The performance of solar cells using a heat sink with a copper base variation of 5 and 10 aluminium fins compared to solar cells without cooling. The results show that at the same intensity of 1100 W / m2, the solar cell without cooling gets an operating temperature of 64.6 °C, an efficiency of 9.50% and an output power of 36.63 W. Solar cells with a 5-fin heat sink, can reduce the operating temperature is 57.7 °C, an efficiency of 11.42% and an output power of 44.02 W. Whereas the cooling panel with 10 fins obtains a temperature of 55.6 °C, maximum efficiency and power are 12.03% and 46.37 W respectively. The addition of 10-fin heat sinks to solar cells produces the best performance which can reduce operating temperatures by 9 °C, increasing efficiency and output power are 2.53% and 9.74 W respectively compared to solar cells without cooling.
Analysis of TiO2/Water-based Photovoltaic Thermal (PV/T) Collector to Improve Solar Cell Performance
Authors: Fadli A F , Kristiawan B , Suyitno  , Arifin Z
Published: March 2021

Indonesia is a country with a tropical climate, so it gets a large amount of solar energy. Along with technological developments, solar energy can be converted into electrical energy by using a device called a PV panel. From several research that have been carried out, it was concluded that with an increase in every 1 °C the working temperature of the PV panels will reduce efficiency by 0.5%. This article will discuss the effect of using TiO2/water nanofluid with a concentration of 0.5 vol.% on a collector photovoltaic thermal (PV/T) system for PV panel cooling. The results obtained at the radiation intensity of 1100 W/m2, the use of a TiO2/water-based PV/T collector system can reduce the working temperature of solar panels by 11.4 °C. It also increased output power by 10.38 W and efficiency by 2.69% compared to PV panels without cooling.
Characteristic of Unhulled Rice Drying on Swirling Fluidized Bed Dryer
Authors: Novrinaldi  , Putra S A , Sitorus A
Published: March 2021

The most important thing of drying is removing moisture from materials towards the equilibrium moisture with normal ambient air. One of the drying ways is to use Swirling Fluidized Bed Dryer (SFBD) for drying materials in the form of granules or seeds. The experiment of Swirling Fluidized Bed to dry out unhulled rice was carried out. This research aims to find the characteristics of unhulled rice after the drying process and performance of SFBD. Swirling fluidized bed dryer with 15° angles of blade inclination, 650 mm of plenum chamber depths, and 30 blades were used to dry out unhulled rice 1 kg, 2 kg and 3 kg. In this study, 16.2 m/s hot air velocity and 55 °C were used to dryer out unhulled rice as long as 45 minutes. Initial moisture content of unhulled rice are 24.1% for 1 kg, 23.6% for 2 kg and 23.7% for 3 kg and final moisture content were 11.68%, 13.13% and 12.13% respectively. The evaporated mass of water was 123.2 gr, 217.5 gr, and 356.1 gr. The plenum pressure on the capacity unhulled rice of 1, 2, and 3 kg are 59.6 mmH2O and 16.7 mmH2O, 78.5 mmH2O, respectively. The drying chamber pressure on the capacity unhulled rice of 1, 2, and 3 kg are 35.1 mmH2O, 79.9 mmH2O, and 37.5 mmH2O, respectively.
Strategy and Master Plan for Water Supply and Domestic Wastewater in Klungkung Regency, Bali
Authors: Septiariva I Y , Suryawan I W K , Suhardono S , Sofiyah E S , Zahra N L
Published: March 2021

Klungkung Regency is the second smallest regency/city area after Denpasar City. The declaration of the Indonesian government in meeting the MDG’s target for zero slums has been followed by the district government of Klungkung with a focused policy and strategic direction. The identification of slum issues is carried out on several indicators for the conditions of water supply and wastewater services. The purpose of this paper is to make long-term planning to realize integrated domestic wastewater treatment until 2033. This research uses a qualitative approach with descriptive methods and data analysis was performed by data display, verification, and conclusion drawing. To overcome the problem of fulfilling raw water, efforts are made to handle it through plans for phases I, II, III, and IV. In the period from 2019-2023, a drinking water supply system will be developed by utilizing raw water from the Muara Unda Reservoir, which is 300 L/sec. In phase III, a transmission unit will be built in the raw water delivery system from the Penida Spring with an additional capacity of 20 L/sec. In Klungkung Regency, there is no centralized wastewater treatment plant to treat wastewater from this domestic activity. Most residents in Klungkung Regency dispose of their domestic waste/water through septic tanks (for black water), while gray water is directly channeled into drainage channels or directly discharged into rivers.
Performance Evaluation of Different Objective Function in PID Tuned by PSO in DC-Motor Speed Control
Authors: Maghfiroh H , Saputro J S , Hermanu C , Ibrahim M H , Sujono A
Published: March 2021

The electric motor is an electromagnetic device that converts electrical energy into mechanical energy. There are many industrial sectors using electrical motors. Almost 90% of industries still use PID control because of its simplicity, applicability, and reliability. However, the weakness of PID is that it takes a long time to tune. PSO is one of the optimization methods which can be used to tune PID. The objective function is needed when using PSO to tune PID control. Five different objective functions which are ISE, IAE, ITSE, ITAE, and MSE is compared in terms of performance and control energy. The PID controller is applied in DC motor speed control in a simulation environment. Three testing condition is carried out which is step responses, set-point changes, and disturbance rejection. The simulation result shows that in terms of performance, ITSE is the best one. On the other hand, in terms of control energy, ISE is using the lowest energy to control the plant.
Multi DC Load Single Port Output Adaptive Power Charge Using Fuzzy Logic Controller
Authors: Maulidyna A N , Sudiharto I , Murdianto F D
Published: March 2021

The battery is an electronic device that is capable of storing electrical energy. The ability of batteries to store electrical energy is widely used to supply DC loads. Batteries on a wide range of DC loads have varying voltages and capacities. Generally, battery chargers are likely to be static with one specific load voltage. One charge device is usually used to charge one type of DC load. The Adaptive power charge system can be used to charge various types of DC loads with different voltages and capacities through one output port. In this paper method of charging with constant voltage, to keep the output voltage from the SEPIC converter stable used fuzzy logic controller. In this research, the adaptive power charge system using a fuzzy logic controller can charge various types of DC loads with different voltages, has a 99.8% precision with an average error of less than 0.16% and the system reaches a steady-state at 0.4 seconds. Adaptive power charge makes it easy to charge various types of DC loads.
Cyber-Physical Systems-Based PID Controller for Three Interacting Tank Process Level Control
Authors: Joelianto E , Nadhira V , Hammami H , Hariyadi
Published: March 2021

This paper considers the performance improvement of PLC-based process control systems through Industry 4.0 by harnessing cyber-physical systems (CPS), which is an integration of control, computation, and networking to intertwine intensely cyber and physical components. To accomplish these needs, open process control (OPC) unified architecture (UA) is exercised as a horizontal and vertical integrator of the CPS-based process automation. The three interacting tank process is the preferred testing plant because this system has become a proven benchmark for testing advanced control system in the laboratory scale. In this paper, the cyber component accomplishes parameter optimization of the PID controller for the level control of the three interacting tank process and schedules the appropriate PID controller that matches the level operating conditions. The control implementation shows that CPS for the level control of the three interacting tank process works well by resulting in smaller integral square error (ISE) value. Moreover, the cloud-based database can be established directly using OPC UA for real-time monitoring of the process through websites using the Internet network with data delivery rate of 100%.
Prediction Point of Fault Location on Its Campus Power Grid by using Neural Artificial Method
Authors: Syamsudin A , Hafidz I , Rahmatullah D , Asfani D A , Negara I M Y
Published: March 2021

The dispersed electric load connected to the power system leads to various nominal current and direction. However, to protect the plan optimally, relay settings must be updated according to its configuration. This paper investigates the prediction of fault location point for Directional Overcurrent Relay (DOCR). The system used Institut Teknologi Sepuluh Nopember (ITS) Campus electricity system connected to the grid utility. Artificial Neural Network (ANN) include data combination of power flow and short circuit as input data, can determine the appropriate fault location of the system. From the result, the data set in the master control has a smaller composition than by performing manual looking for tables. From the simulation result, 313 testing data obtained an average error of 0.002614377 so that the test results are quite close to the target data. Another advantage is that fewer data must be entered in Master control when using ANN, 136 data, compared using a lookup table, 1512 data. Through this method, the user can predict the fault location quickly and accurately.
Design and Implementation of Hybrid Filter for Harmonic Reduction and Damped Resonances in Non-Linear Loads
Authors: Arif Y C , Raharja L P S , Auladah S
Published: March 2021

The use of Power Factor Correction (PFC) is generally used to increase the power factor in a system plan. However, the system will be dangerous if there are non-linear loads on the system that causes resonance risk. The impedance of the capacitor bank for PFC can interact with the non-linear loads and the impedance of the up-transformer which causes series and/or parallel resonances. Resonance causes surges in currents and voltages at harmonic frequencies. This problem can be solved by adding a detuned reactor filter in PFC. However, the implementation of detuned LC passive filters can’t reduce all harmonic components. This paper presents a hybrid filter consisting of a detuned LC passive filter and an active filter to reduce harmonics, avoid the system from resonance risk, and to improve the power factor. This system using 5Kvar of capacitor bank and a 14% detuned reactor filter combined with an active filter. The results of power quality increasing the power factor from 0.6 to 0.88, THDi is reduced from 49.5% to 18% after using a hybrid filter.
Implementation of Real-Time Edge Detection Using Canny and Sobel Algorithms
Authors: Lynn N D , Sourav A I , Santoso A J
Published: March 2021

The process of performing tasks related to image processing requires the use of potential techniques such as edge detection. The technique can be used to accomplish tasks related to video and image manipulation. The process of edge detection is very virtual as it acts as the first phase of image analysis and understanding. In this paper, the edges of real-time images were detected for easy extraction of meaningful information from images. A prototype was implemented on OpenCV which is an in-built function cv2. () using python. Canny and Sobel edge detection algorithms are chosen to be used in this paper for comparison purposes to find out which method is better at edge detection. After using both algorithms to detect edges of real-time images, the result showed that the Canny algorithm produced thick edges compared to the Sobel algorithm. The canny algorithm follows the criteria of; Good detection, Good localization, and Minimal response, to output good edge detection results More so, canny uses a double threshold for edge revelation and applies the Gaussian filter which removes of any noise from an image, unlike Sobel which is not resistant to noise. The developed prototype for this study can detect edges of real-time objects without the intervention of any sensor input.
Emission Dispersion Modelling using AERMOD on GT 1.3 PLTGU Muara Karang in Evaluate Combustor Upgrade Effect
Authors: Leilan F , Revina T , Hutajulu D S
Published: March 2021

Muara Karang power plant dominated by Gas Turbine Power Plant. One of those there is Gas Turbin 1.3 has been upgraded, thus make load ouput become increased. This study aims to see the emission dispersion generated from combustor before and after being upgraded. The emission data is obtained from combustion modelling on combustor GT 1.3 pre and post extendor using CFD methode. Then, the data will be used for emission dispersion modelling using AERMOD. The emission dispersion modelling uses two condition. First is the initial state based on environment assessment document in 2010 and second is in current environment state. The modelling shows that after the combustor upgraded, the NOx emission increase by 15%, CO emission decrease by 37%. Emission dispersion modelling result shows that there is a change in the area that has the highest concentration. In the initial environment state, area with highest concentration is on the west side of the power plant with NOx concentration is 35.46303 ug/m3, And CO concentration is 1.3362 ug/m3. In the current environment state, the area is on the east side of the power plant area with highest concentration is NOx concentration is 61.47481ug/m3 And CO concentration is 2.3163 ug/m3.
Decarbonizing Electricity in Indonesia: Opportunity in the Implementation of Rooftop Solar PV
Authors: Sukarso P , Adimas
Published: March 2021

Efforts to decarbonize the electricity generation system to mitigate the environmental impacts including climate change are done around the world. The world is in an act of transfer from fossil fuel to new and renewable energy. Indonesia is trying to achieve future energy mix target through penetration in technology and policies emphasize. Indonesia through its state-owned company, PT Pembangkitan Jawa Bali (PT PJB) has a huge potential for new and renewable energy, particularly rooftop solar photovoltaic. Indonesia solar PV capacity installation was only 0.04% on 2017 whilst theoretical solar potential production is around 207.9 GW (4.8 kWh/m2/day). This article results that utilization rooftop asset from PT PJB can produce 8.09 GWh/year of electricity and reduce carbon dioxide which parameter greenhouse gas emission from electricity around 8.81 tonCO2eq in accordance with comparisons from coal power plant.
Exergy and Energy Analysis of CFPP
Authors: Musyafa R J
Published: March 2021

Energy and exergy analysis of Pulverized Coal Fired Subcritical Power Plant (CFPP) performed to assess power plant performance and identify major losses both energy and exergy term. It’s found that, based on energy analysis, major losses occur in condenser, moisture in coal and steam turbine. While exergy analysis result that most exergy losses and destruction was in boiler and feedwater heater. Energy efficiency of boiler on 250MW, 300MW and 380MW was 68.56%, 69.56% and 72.42% respectively while exergetic efficiency was 52.81%, 56.33% and 57.39% respectively.
Simulation of Effects Off Service Closed Feedwater Heater on Steam Power Plant Performance Using Cycle Tempo 5.0
Authors: Mahendra R , Wiratama C G , Setiyawan A
Published: March 2021

Steam power plant needs three important things in its operation, they are safety, reliability, and efficiency. Steam power plant efficiency can be elevated by installing regenerative feedwater heater. Feedwater heater is used to increase the temperature of water needed for combustion process in the boiler, therefore minimizing the fuel used in boiler. Case study is taken from PT. PJB UP Muara Karang Steam Power Plant unit 4 and 5. HPH 4 off service in August 2018 caused thermal efficiency drop about 1.86 % from the previous month. The same case was found in January 2019, in which HPH F off service caused 0.68 % from the previous month. This study’s aim is to find out the effect of off service closed feedwater heater to steam power plant performance using Cycle Tempo 5.0. Steam power plant unit 5 with 172 MW load is modelled on Cycle Tempo. Validation is done by comparing some parameter of simulation result to performance test result with 5% error tolerance. Few variation off service feedwater heater conditions are done by regulating valve for line bypass in order to set feedwater flow into tubes as well as drain flow. NPHR analysis is done by gathering net power and heat needed in boiler for each variation. The result obtained from this study shows that off service feedwater heater cause NPHR enhancement. The highest NPHR increase is achieved when HPH F is on off service condition, with value about 30.58 kCal/kWh. Off service HPH has bigger effect on NPHR increase than LPH on the same condition. Steam power plant efficiency increase continuously with the greater amount of operating feedwater heater. 3 LPH and 2 HPH usage on steam power plant with 172 MW load is assessed as adequate efficient, with all feedwater heater operating at 33.39 %.
Hybrid Grey Wolf Algorithm for Energy-Efficient Scheduling with Sequence-Dependent Setup Times: A Case Study
Authors: Utama D M
Published: March 2021

Non-renewable energy consumption is one of the dominant factors in global warming. The industrial sector has a significant contribution to this problem. At present, the company is required to carry out efficiency, especially energy consumption, because the industry contributes to the most significant energy consumption. One effort to minimize energy consumption in the industrial sector is with proper scheduling. This research attempts to develop the Hybrid Grey Wolf Optimizer (HGWO) Algorithm to complete Energy-Efficient Scheduling (EES) on the Permutation Flow Shop Scheduling Problem (PFSP). This study considers Sequence-Dependent Setup Times on the PFSP problem. A case study was used to resolve EES on PFSP problems. The HGWO parameter experiment was also used to test the parameters in the case study solving. This research also compares HGWO with several popular procedures. The comparison of algorithms shows that the results of the HGWO algorithm are more competitive for completing EES in PFSP problems.
Surging Phenomenon in Gas Engine Crankcase
Authors: Arsana V M , Riski R R , Wahyudi P
Published: March 2021

An internal combustion engine is an engine whose combustion process is inside a closed room or often referred to as the combustion chamber. The Wartsila W20V34SG engine is one of the internal combustion engines used to turn generators to generate electricity, over time some new problems arise that cause engine trip. One cause of a sudden increase in crankcase pressure is the occurrence of the phenomenon of surging in the crankcase. The causes of surging originating from the phenomenon of bursts of engine exhaust gas leaks to the surface of the oil mist pipe. Where the average temperature of the exhaust gas is approximately 530 °C so that the hot gas burst increases the temperature of the oil mist pipe and result in lower gas density and oil vapor. This phenomenon causes the air to become lighter and rise to the top and make the room in the crankcase more vacuum up to -6.29 mBar at which point the pressure will rise significantly up to ± 25 mBar. This value has exceeded the limit of the crankcase pressure protection setting which is 5.57 mBar causing the engine to trip.
Computational Simulation of Gas-Solid Flow to Reduce Erosion in a Circulating Fluidized Bed (CFB) Boiler
Authors: Wisyaldin M K , Akshinta P Y , Barkati A , Pariaman H , Hisjam M
Published: March 2021

Circulating fluidized bed (CFB) is one type of coal combustion technologies that plays an essential role in the power generation. CFB boilers use the principle of the thermal inertia of material deliberately inserted into the furnace (known as bed materials) which is usually sand particles. The existence of materials in the form of particles with high speed can lead to erosion on the wall furnace. The amount of erosion in the furnace wall is influenced by the speed and flow pattern as well as the particle shape of the particle. This paper performed three-dimensional simulations of a CFB boiler using CPFD software to determine the behavior and location of erosion on furnace modelling and simulation. A computational particle fluid dynamics model of a pilot-scale circulating fluidized bed (CFB) was used to simulate its gas-solid flow characteristics numerically. The accuracy of the model was confirmed by a comparison of the simulation results with the operation data. Decreasing the operating parameters according to the calculation of stoichiometry reactions shows a decrease in erosion, thereby making CFB boiler more reliable. Furthermore, the simulation result provide a reference for further comprehension of the flow characteristics in CFBs.
Influence of Reactive Ion Etching Time on Fabrication of Porous Silicon on Si (110) Substrates
Authors: Suryana R , Mas’ud M M , Nakatsuka O
Published: March 2021

Porous silicon (PSi) has been fabricated by photolithography and Reactive Ion Etching (RIE) with various etching times in the previous study. The PSi surfaces have the pore size in the range of 12.6-28.0 nm for PSi (111) and 17.4-37.7 nm for PSi (100). Meanwhile, the PSi has the resistivity around (1.14-2.60)×10−4 Ω.cm for PSi (111) and (3.85-9.03)×10−4 Ω.cm for PSi (100). In this study, N-type Si (110) substrate was used to form PSi with various etching times for 10, 20 and 40 min. The PSi samples were characterized by SEM, Dektak XT profilometer, UV-Vis and FPP equipment. PSi formed into a spherical shape which distributed throughout the Si surface. Pore sizes, pore depths and resistivity of patterned PSi increased as the etching time increases, i.e., 4.04 µm, 30.85 nm and 2.26×10−4 Ω.cm (10 min); 4.98 µm, 51.93 nm and 3.86×10−4 Ω.cm (20 min); 6.00 µm, 80.67 nm and 5.77×10−4 Ω.cm (40 min), respectively. This indicated that the pores could be considered as defects or dislocation inside material which resist electrons diffuse toward the electrode. Moreover, the PSi reflectance value decreases 30% to around 10% on the visible light range with the increasing of etching time.
Synthesis LiFePO4 at Various Atmosphere Condition
Authors: Lestari I P , Arinawati M , Hutama A P , Yudha C S , Rahmawati M , Widiyandari H , Nur A , Purwanto A
Published: March 2021

LiFePO4 is considered the most environmentally friendly, inexpensive, abundant, has good cycle stability and thermal stability. However, LiFePO4 has the main disadvantage of potential voltage and conductivity which is relatively lower than other batteries. This can be overcome by adding carbon and reducing particle size. The method used in this research is the rheological phase method. This method was chosen because the material used is easy to obtain and the price is cheap, no requires a lot of tools, and good homogeneity. LiFePO4 is very sensitive to direct air. So in this study an evaluation of the effect of argon gas, hydrogen, and nitrogen on the material. LiFePO4 analyzed its morphology with SEM (Scanning Electron Microscopy), its crystallinity with XRD (X-Ray Diffraction) and functional group of LiFePO4 with FTIR (Furier Transformation Infra-Red). Based on the characterization result, the optimum synthesis product continued battery performance test. LiFePO4 H2-Ar produces the best battery capacity compared to other gases because it uses reducing gas which can increase the carbon content of the material.
Real structures on symmetric spaces
Authors: Moser-Jauslin Lucy , Terpereau Ronan
Published: March 2021

We obtain a necessary and sufficient condition for the existence of equivariant real structures on complex symmetric spaces for semisimple algebraic groups and discuss how to determine the number of equivalence classes for such structures.
Multiplicities of fields of values of irreducible characters of finite groups
Authors: Moretó Alexander
Published: March 2021

We show that if

f
f

is the largest multiplicity of the fields of values of the irreducible characters of a finite group

G
G

, then

|

G

|

|G|

is bounded from above in terms of

f
f

.
Geodesics of projections in von Neumann algebras
Authors: Andruchow Esteban
Published: March 2021

Let

A

{\mathcal {A}}

be a von Neumann algebra and

P

A

{\mathcal {P}}_{\mathcal {A}}

the manifold of projections in

A

{\mathcal {A}}

. There is a natural linear connection in

P

A

{\mathcal {P}}_{\mathcal {A}}

, which in the finite dimensional case coincides with the the Levi-Civita connection of the Grassmann manifold of

C

n

\mathbb {C}^n

. In this paper we show that two projections

p
,
q

p,q

can be joined by a geodesic, which has minimal length (with respect to the metric given by the usual norm of

A

{\mathcal {A}}

), if and only if

p
∧

q
⊥

∼

p
⊥

∧
q
,

\begin{equation*} p\wedge q^\perp \sim p^\perp \wedge q, \end{equation*}

where

∼
\sim

stands for the Murray-von Neumann equivalence of projections. It is shown that the minimal geodesic is unique if and only if

p
∧

q
⊥

=

p
⊥

∧
q
=
0

p\wedge q^\perp = p^\perp \wedge q=0

. If

A

{\mathcal {A}}

is a finite factor, any pair of projections in the same connected component of

P

A

{\mathcal {P}}_{\mathcal {A}}

(i.e., with the same trace) can be joined by a minimal geodesic.

We explore certain relations with Jones’ index theory for subfactors. For instance, it is shown that if

N

⊂

M

{\mathcal {N}}\subset {\mathcal {M}}

are II

1

_1

factors with finite index

[

M

:

N

]
=

t

−
1

[{\mathcal {M}}:{\mathcal {N}}]={\mathbf {t}}^{-1}

, then the geodesic distance

d
(

e

N

,

e

M

)

d(e_{\mathcal {N}},e_{\mathcal {M}})

between the induced projections

e

N

e_{\mathcal {N}}

and

e

M

e_{\mathcal {M}}

is

d
(

e

N

,

e

M

)
=
arccos
⁡
(

t

1

/

2

)

d(e_{\mathcal {N}},e_{\mathcal {M}})=\arccos ({\mathbf {t}}^{1/2})

.