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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 434 journals)
Showing 1 - 200 of 265 Journals sorted alphabetically
AAS Open Research     Open Access   (Followers: 2)
ABC Journal of Advanced Research     Open Access  
Academic Voices : A Multidisciplinary Journal     Open Access   (Followers: 2)
Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 18)
Acta Materialia Transilvanica     Open Access  
Acta Nova     Open Access   (Followers: 1)
Acta Scientifica Malaysia     Open Access  
Acta Scientifica Naturalis     Open Access   (Followers: 3)
Adıyaman University Journal of Science     Open Access  
Advanced Science     Open Access   (Followers: 13)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 10)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advances in Research     Open Access   (Followers: 1)
Advances in Science and Technology     Full-text available via subscription   (Followers: 17)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 8)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 2)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 4)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 2)
American Academic & Scholarly Research Journal     Open Access   (Followers: 6)
American Journal of Applied Sciences     Open Access   (Followers: 27)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 15)
Anadol University Journal of Science and Technology B : Theoritical Sciences     Open Access  
Anadolu University Journal of Science and Technology A : Applied Sciences and Engineering     Open Access  
ANALES de la Universidad Central del Ecuador     Open Access   (Followers: 3)
Anales del Instituto de la Patagonia     Open Access  
Annali dell'Istituto e Museo di storia della scienza di Firenze     Hybrid Journal  
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 1)
Apuntes de Ciencia & Sociedad     Open Access  
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 6)
Archives of Current Research International     Open Access  
ARO. The Scientific Journal of Koya University     Open Access  
ARPHA Conference Abstracts     Open Access   (Followers: 7)
ARPHA Proceedings     Open Access   (Followers: 4)
ArtefaCToS : Revista de estudios sobre la ciencia y la tecnología     Open Access   (Followers: 1)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Journal of Advanced Research and Reports     Open Access   (Followers: 2)
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 2)
Asian Journal of Scientific Research     Open Access   (Followers: 3)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 7)
Australian Field Ornithology     Full-text available via subscription   (Followers: 4)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 7)
Avances en Ciencias e Ingeniería     Open Access  
Avrasya Terim Dergisi     Open Access  
AZimuth     Full-text available via subscription   (Followers: 2)
Bangladesh Journal of Scientific Research     Open Access   (Followers: 1)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 10)
Berkeley Scientific Journal     Full-text available via subscription  
BIBECHANA     Open Access   (Followers: 2)
BibNum     Open Access  
Bilge International Journal of Science and Technology Research     Open Access   (Followers: 1)
Bioethics Research Notes     Full-text available via subscription   (Followers: 16)
Bistua : Revista de la Facultad de Ciencias Básicas     Open Access  
Bitlis Eren Üniversitesi Fen Bilimleri Dergisi     Open Access  
Bitlis Eren University Journal of Science and Technology     Open Access   (Followers: 1)
Black Sea Journal of Engineering and Science     Open Access  
Borneo Journal of Resource Science and Technology     Open Access  
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Bulletin de la Société Royale des Sciences de Liège     Open Access  
Bulletin of the National Research Centre     Open Access  
Butlletí de la Institució Catalana d'Història Natural     Open Access  
Celal Bayar Üniversitesi Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Central European Journal of Clinical Research     Open Access  
Chain Reaction     Full-text available via subscription  
Ciencia & Natura     Open Access   (Followers: 1)
Ciencia Amazónica (Iquitos)     Open Access   (Followers: 1)
Ciencia en Desarrollo     Open Access   (Followers: 2)
Ciencia en su PC     Open Access   (Followers: 1)
Ciencia Ergo Sum     Open Access  
Ciência ET Praxis     Open Access  
Ciencia y Tecnología     Open Access  
Ciencia, Docencia y Tecnología     Open Access  
Ciencias Holguin     Open Access   (Followers: 2)
CienciaUAT     Open Access   (Followers: 1)
Citizen Science : Theory and Practice     Open Access   (Followers: 1)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Applied Sciences     Open Access  
Comprehensive Therapy     Hybrid Journal   (Followers: 3)
Comunicata Scientiae     Open Access   (Followers: 1)
ConCiencia     Open Access  
Conference Papers in Science     Open Access   (Followers: 2)
Configurations     Full-text available via subscription   (Followers: 10)
COSMOS     Hybrid Journal  
Crea Ciencia Revista Científica     Open Access   (Followers: 3)
Cuadernos de Investigación UNED     Open Access  
Cumhuriyet Science Journal     Open Access  
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 15)
Current Research in Geoscience     Open Access   (Followers: 8)
Dalat University Journal of Science     Open Access  
Data     Open Access   (Followers: 4)
Data Curation Profiles Directory     Open Access   (Followers: 4)
Dhaka University Journal of Science     Open Access  
Dharmakarya     Open Access  
Diálogos Interdisciplinares     Open Access  
Digithum     Open Access   (Followers: 2)
Discover Sustainability     Open Access  
Eastern Anatolian Journal of Science     Open Access  
Einstein (São Paulo)     Open Access  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Elkawnie : Journal of Islamic Science and Technology     Open Access  
Emergent Scientist     Open Access  
Enhancing Learning in the Social Sciences     Open Access   (Followers: 9)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Entramado     Open Access  
Entre Ciencia e Ingeniería     Open Access   (Followers: 1)
Epiphany     Open Access   (Followers: 4)
Episteme Transversalis     Open Access  
Ergo     Open Access  
Estação Científica (UNIFAP)     Open Access   (Followers: 1)
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 6)
Ethiopian Journal of Science and Technology     Open Access  
Ethiopian Journal of Sciences and Sustainable Development     Open Access   (Followers: 7)
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 12)
European Scientific Journal     Open Access   (Followers: 10)
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Exchanges : the Warwick Research Journal     Open Access   (Followers: 2)
Extensionismo, Innovación y Transferencia Tecnológica     Open Access   (Followers: 5)
Facets     Open Access  
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access   (Followers: 1)
Fırat Üniversitesi Fen Bilimleri Dergisi     Open Access  
Fırat University Turkish Journal of Science & Technology     Open Access  
Fontanus     Open Access  
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 372)
Frontiers for Young Minds     Open Access  
Frontiers in Climate     Open Access   (Followers: 3)
Frontiers in Science     Open Access   (Followers: 1)
Futures & Foresight Science     Hybrid Journal   (Followers: 3)
Gaudium Sciendi     Open Access   (Followers: 1)
Gazi University Journal of Science     Open Access  
Gaziosmanpaşa Bilimsel Araştırma Dergisi     Open Access  
Ghana Studies     Full-text available via subscription   (Followers: 15)
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
Global Journal of Science Frontier Research     Open Access   (Followers: 2)
Globe, The     Full-text available via subscription   (Followers: 4)
HardwareX     Open Access  
Heidelberger Jahrbücher Online     Open Access  
Heliyon     Open Access  
Himalayan Journal of Science and Technology     Open Access   (Followers: 1)
Hoosier Science Teacher     Open Access  
Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi / Journal of the Institute of Science and Technology     Open Access  
Impact     Open Access   (Followers: 2)
Indonesian Journal of Fundamental Sciences     Open Access  
Indonesian Journal of Science and Mathematics Education     Open Access   (Followers: 4)
Indonesian Journal of Science and Technology     Open Access  
Ingenieria y Ciencia     Open Access   (Followers: 1)
Innovare : Revista de ciencia y tecnología     Open Access  
Instruments     Open Access  
Integrated Research Advances     Open Access  
Interciencia     Open Access   (Followers: 1)
Interface Focus     Full-text available via subscription  
International Annals of Science     Open Access  
International Archives of Science and Technology     Open Access  
International Journal of Academic Research in Business, Arts & Science     Open Access   (Followers: 2)
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
International Journal of Advancement in Education and Social Sciences     Open Access   (Followers: 1)
International Journal of Advances in Engineering, Science and Technology     Open Access   (Followers: 3)
International Journal of Applied Science     Open Access  
International Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
International Journal of Computational and Experimental Science and Engineering (IJCESEN)     Open Access  
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Engineering, Technology and Natural Sciences     Open Access  
International Journal of Innovation and Applied Studies     Open Access   (Followers: 12)
International Journal of Innovative Research and Scientific Studies     Open Access   (Followers: 5)
International Journal of Innovative Research in Social and Natural Sciences     Open Access   (Followers: 2)
International Journal of Network Science     Hybrid Journal   (Followers: 3)
International Journal of Recent Contributions from Engineering, Science & IT     Open Access   (Followers: 1)
International Journal of Research in Science     Open Access   (Followers: 2)
International Journal of Science & Emerging Technologies     Open Access   (Followers: 1)
International Journal of Sciences : Basic and Applied Research     Open Access  
International Journal of Social Sciences and Management     Open Access   (Followers: 2)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 7)
International Letters of Social and Humanistic Sciences     Open Access   (Followers: 1)
International Review of Applied Sciences     Open Access  
International Scientific and Vocational Studies Journal     Open Access   (Followers: 2)
InterSciencePlace     Open Access   (Followers: 1)
Investiga : TEC     Open Access  
Investigación Joven     Open Access  
Investigación Valdizana     Open Access  
Investigacion y Ciencia     Open Access   (Followers: 1)
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
iScience     Open Access  
Issues in Science & Technology     Free   (Followers: 7)
İstanbul Ticaret Üniversitesi Fen Bilimleri Dergisi / İstanbul Commerce University Journal of Science     Open Access  
Istituto Lombardo - Accademia di Scienze e Lettere - Rendiconti di Scienze     Open Access  
Ithaca : Viaggio nella Scienza     Open Access  
J : Multidisciplinary Scientific Journal     Open Access  
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription   (Followers: 2)
Journal for New Generation Sciences     Open Access   (Followers: 3)
Journal of Chromatography & Separation Techniques     Open Access   (Followers: 12)
Journal of Advanced Research     Open Access   (Followers: 3)
Journal of Al-Qadisiyah for Pure Science     Open Access   (Followers: 1)
Journal of Analytical Science & Technology     Open Access   (Followers: 6)
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 3)
Journal of Big History     Open Access   (Followers: 3)
Journal of Composites Science     Open Access   (Followers: 3)
Journal of Critical Thought and Praxis     Open Access   (Followers: 2)
Journal of Deliberative Mechanisms in Science     Open Access  

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Advances in Science and Technology
Number of Followers: 17  
 
  Full-text available via subscription Subscription journal
ISSN (Online) 1662-0356
Published by Scientific.Net Homepage  [14 journals]
  • Application of Waste Elimination Theory in Production Processes at
           Balikpapan Shipyard
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Taufik Hidayat, Rodlian Jamal Rodlian, Suardi, Sabran
      The shipbuilding industry also supports the economic sector in Balikpapan. Shipbuilding industry business generally consists of new building and ship repair. There is a shipyard in Balikpapan that already has experience in making landing craft tanks, tugboats and barges. But according to the head of production, this shipyard often experiences delays in the production process. Based on temporary assumptions, this happens due to correction and re-works waste. This study aims to find the initial causes of waste that occur, and try to prevent it. Prevention from the initial cause, is a meaningful innovation. This study uses the fault tree analysis (FTA) method as a modeling of the root causes; and waste management theory is used as the basis for the science of innovation application. The research objective is to increase shipyard productivity. Based on research there are five top events that cause delays in the production process at Balikpapan shipyard, they are work not done; incorrect raw material specifications; incorrect product specifications; changes by surveyor owner; and not yet approved by the class.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • Factors Analysis for Risk Perception in Fabrication Work
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Mega Rahayu Hardiyanti, Ratna Sari Dewi
      Accidents in industry is not only cause damage, but also economic losses for the company. One of the causes of accidents is the reduced safety performance of workers. One cause of the lack of safety performance is still lack of understanding in analyzing hazards in the workplace and also discussing safety risk perception. Related research proves that a considerable amount of damage has been found associated with inaccurate safety risk perception. In fabrication work, with the characteristics of work that monotonous position of working, causing musculoskeletal disorders that become of the hazard that need to be considered. Safety performance is also related to safety culture. Safety culture is not only related to institutional and safety policies, but also related to the structural and contextual aspects of the organization. Therefore, the researcher emphasizes to study the combination of personality traits, body pain, and organizational hierarchies on safety risk perception in the field of fabrication work by modeling using SEM. The purpose of this study is to consider about safety risk perception in fabrication work for safety management system that is implemented. Meanwhile for further research, it is expected that the developed model can be used as a guide in developing safety research.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • Evaluation of Recurrent Neural Network Based on Indonesian Speech
           Synthesis for Small Datasets
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Bima Prihasto, Nur Fajri Azhar
      The recurrent neural network (RNN) application when it comes to audio and speech processing in the case of Indonesian-language voice data is rarely done now. This is important because Indonesian languages have different characteristics from foreign languages. So in this case we try to evaluate a number of methods in RNN to make speech synthesis in Indonesian. In this research we use objective measurements, the results we get that LSTM generally produces better sound quality than GRU. While the derivative of GRU, MGU2 gets the best results in the model training time.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • Application of System Dynamics Approach for Minapolitan Area Development
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Muhammad Arif, Budisantoso Wirjodirjo, Endah Angreni
      Economic growth is influenced by regional development policies and the availability of regional resources. One policy that utilizes the potential of fisheries resources is the policy of the Minapolitan area. This policy can potentially lead to conflicts over spatial use when development is carried out without concern for the environment. This study aims to assess the variables that influence and formulate the concept of sustainable regional development. The object of this research is Lekok Regency, Pasuruan Regency, East Java, Indonesia. In this paper, introducing a system dynamic approach with consideration of the complexity of the lives of coastal communities and the variety of conflicts regarding the location and limitations of existing resources, viewed from the aspects of land, economic and social activities of the Minapolitan area development system in actual conditions.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • The Accessibility Level of Balikpapan Botanical Garden According to Public
           Transportation Routes (Balikpapan Botanical Garden Development Concept)
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Rizky Arif Nugroho, Elin Diyah Syafitri, Rahmi Yorika
      East Kalimantan Government had proposed to expand its tourism division, therefore Balikpapan Botanical Garden has to attract tourist to visit. Accessibility has certain degree of effect to affect visitor trip to certain area. Accessibility is a key feature to evaluating transportation system. Measuring accessibility involving how to measure distance from one point to another as the metric. Providing transport accessibility is an essential element of tourist infrastructure development. The analysis method used in this paper is buffer analysis. This method consists of identifying area surrounding geographic feature. It involving generates buffer around existing geographic feature, then identifying feature whether it locates inside or outside the boundary of the buffer. Balikpapan Botanical Garden had medium accessibility. The nearest collector street from Balikpapan Botanical Garden already have public transportation route. Hotels and Balikpapan Botanical Garden were connected via public transportation route. drawback that affect Balikpapan Botanical Garden accessibility was the distance from public transportation stop point to Balikpapan Botanical Gate may less ideal for pedestrian. The trip took about 35 minutes on foot as far as 2.8 kilometres.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • Analyzing of 1D Resistivity Data to Determine Subsurface Condition on the
           Development Area of Institut Teknologi Kalimantan (ITK) Balikpapan
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Febrian Dedi Sastrawan, Meidi Arisalwadi, Rahmania
      Information of subsurface stratigraphy is needed during the process of preparing multi-story buildings to avoid problems in determining the level of multi-story building piles. This research was conducted using the geoelectric method to study the subsurface stratigraphic conditions in the area. Based on the measurement results, we find an overview of the subsurface stratigraphic conditions consisting of soil in the first layer with resistivity values ​​ranging from 305 to 570 Ωm, the soil in the study area is red-yellow, namely podsolic soil mixed with sand and gravel. The second layer is clay layer by water saturated with resistivity values ​​between 15 to 44 Ωm, and the third layer with resistivity values ​​varying from 112 to 341 detected from the surface is sandy clay. Insertion of coal at the first measurement point was detected buried at a depth of 17 m from the surface with a resistivity value of 962 Ωm.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • Study on Implementation of ITK Campus Drainage Master Plan (Case Study:
           Faculty of Mathematics and Natural Sciences)
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Rossana Margaret Kadar Yanti, Oryza Lhara Sari, Rizjal Wahyu
      Two main building Kalimantan Institute of Technology was established on an area of 3500 m2 on October 6, 2014 which serves as the infrastructure for teaching and learning activities of students. The rapid increase in the number of students each year results in an increase in the number of buildings as facilities for teaching and learning. This is the background for the development of the Kalimantan Institute of Technology area by adding five more lecture buildings to support teaching and learning activities for 3500 students. The expansion area for five more lecture buildings is currently under construction in the area of ​​the Faculty of Mathematics and Natural Sciences. The function of the land area has been change due to building construction resulted in an increase in runoff discharge. This condition certainly affects the region if not handled properly. Increased runoff discharge will affect inundation or flooding in the area if it is not equipped with a drainage system as needed. This research is one alternative solution given. This research is in the form of a study on the implementation of a drainage master plan that aims to obtain drainage dimensions such as drainage width, drainage length and drainage depth by observing runoff due to rainwater using the concept of environmentally friendly drainage. The research obtained from the dimensions of tertiary canals with dimensions of 0.10-0.30 meters, secondary channels 0.30-0.45 meters and primary channels 0.35-0.70 meters with the discharge area of ​​the Faculty of Mathematics and Natural Sciences ITK is 1.18 m3/ sec.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • ZIF-8/Cellulose Acetate Based Mixed Matrix Membranes (MMMs) Synthesis and
           Characterization
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Putu Doddy Sutrisna, Candra Wijaya, Christoper Robby, Jessy Liliani
      Mixed matrix membranes (MMMs) have gained much interest in the last two decades to be used as water, waste water, and gas separation membranes. MMMs combine polymer matrix and inorganic filler to improve the performances of pure polymeric membranes. However, the choice of filler should be conducted carefully to avoid the formation of microvoids that can decrease the membrane’s performances. Hence, in this study the synthesis and characterization of Zeolitic Imidazolate Framework-8 (ZIF-8) based MMMs were conducted in which the ZIF-8 has organic component that can improve the particle dispersion and avoid the formation of microvoids. Experimental results showed that ZIF-8 incorporation improved the degree of crystallinity of MMMs and also enhanced the particle dispersion compared to pure inorganic fillers, such as TiO2.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • Prediction of State of Charge (SOC) of Battery Electric Vehicle
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Illa Rizianiza, Dian Mart Shoodiqin
      Batteries have an important thing in development of energy needs. A good performance battery, will support the device it supports. The energy that can save a battery is limited, so the battery will increase its charge and discharge cycles. Incorrect charging and discharging processes can cause battery performance to decrease. Therefore battery management is needed so that the battery can reach the maximum. One aspect of battery management is setting the state which is the ratio of available energy capacitance to maximum energy capacity. One method for estimating load states is the fuzzy logic method, namely by assessing the input and output systems of prediction. Predictor of State of Charge use Mamdani Fuzzy Logic that have temperature and voltage as input variables and State of Charge as output variable. A result of prediction State of Charge battery is represented by the number of Root Mean Square Error. Battery in charge condition has 2.7 for RMSE and level of accuracy 81.5%. Whereas Battery in discharge condition has RMSE 1.5 and level of accuracy 84.7%.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • Potential and Feasibility Analysis of Biomass Energy from Palm Oil Mills
           on North Penajam Paser Regency Region
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Faruq Nashrulloh, Muhammad Sulaiman, Rachmawan Budiarto
      This paper would present a techno-economic potential and feasibility analysis in the planning of renewable energy from palm oil mills on the North Penajam Paser Regency. The analysis was done based on the last three-year production data history of 7 (seven) palm oil processing factories in the region. The total fresh fruit bunches processed were about 891.624 tons/year. The total potential electricity generated from palm oil residue reached 28.009 kWh. This analysis aimed to get a comprehensive insight from the potential biomass energy that exists at the research locations and conduct a feasibility study based on techno-economic analysis to develop renewable energy of new state capital Indonesia and the supporting regions. The technology helps evaluate the technical planning of installations that are possible to build in the area. The economic aspect of sustainability evaluates the net present value (NPV), internal rate of return (IRR), and the payback period of renewable energy installation. The results showed that North Penajam Paser Regency could generate 78,927,223 kWh in a year with a feed-in tariffs is 1,223.481 IDR/kWh. The electricity was feasible to offer to the government electrical company. Moreover, this project had a good NPV and IRR for private investors.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • Effect of Slotted Angle on Savonius Wind Turbine Performance
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Rahmat Wahyudi, Diniar Mungil Kurniawati, Alfian Djafar
      The potential of wind energy is very abundant but its utilization is still low. The effort to utilize wind energy is to utilize wind energy into electrical energy using wind turbines. Savonius wind turbines have a very simple shape and construction, are inexpensive, and can be used at low wind speeds. This research aims to determine the effect of the slot angle on the slotted blades configuration on the performance produced by Savonius wind turbines. Slot angle variations used are 5o ,10o , and 15o with slotted blades 30% at wind speeds of 2,23 m/s to 4,7 m/s using wind tunnel. The result showed that a small slot angle variation of 5o produced better wind turbine performance compared to a standard blade at low wind speeds and a low tip speed ratio.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • The Influence of Energy Released and Machine Performance on the Yield of
           Biochar from Jengkok Tobacco Processed Using Pyrolysis
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Taufik Iskandar, Ayu Chandra Kartika Fitri, SP. Abrina Anggraini
      The pyrolysis process of jengkok tobacco is influenced by the quality of the raw material, production machine, process parameters and production yield standards. Optimal process requires efficiency and effectiveness of the usage of energy and machine, because all of those affect the quantity and quality of the end products. The purpose of this study was to determine the effect of energy released and machine performance on the percentage of Jengkok Biochar Yield produced through the pyrolysis process. The primary data was obtained directly from the production process. Variables used were temperature (510°C, 515°C, 520°C) and processing time (30 minutes, 35 minutes, 40 minutes). This study found that the most efficient energy required was at the temperature of 520°C and 35 minutes time period, so that the energy released decreased while the machine performance increased and the % yield was higher.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • An Analyze of Fatigue Life Construction of Lifting Poonton for Small
           Vessel
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Alamsyah, Wira Setiawan, S.O. Nugroho, Rodlian Jamal Rodlian, W. Amalia Ika, E.H.A.P. Mangapoi
      Developing prototype aluminum pontoon lifting that functions as a floating dock for the repair of small vessels. To ensure the safety aspects of the construction of the Poonton lift, structural analysis is carried out. The purpose of research to determine the strength and fatigue life construction of lifting ponton due to loads. The method used is the finite element method and the palmgren-miner method. This research uses finite element based software. The results showed that the maximum stress value in the construction of the lifting pontoon is (σmax) = 74,897 MPa which is located in the H-Beam construction that functions as a supporting. The estimated fatigue life of the poonton lifting analyzed during operation is 9.46 years with a total load cycle of 1111680 cycles.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
  • Process Simulation and Economic Analysis of Rhamnolipid Production by
           Pseudomonas aeruginosa Using Oil Palm Empty Fruit Bunch as Substrate
    • Abstract: Publication date: 9 February 2021
      Source: Advances in Science and Technology Vol.104
      Author(s): Andrea Gilang Fauzi, Cut Nanda Sari, Andre Fahriz Perdana Harahap, Muhammad Yusuf Arya Ramadhan, Misri Gozan
      Surfactants are amphiphilic molecules that have been used in widely used as emulsifier and cleaning agent in various industries. These broad industrial applications made the global surfactant production increased annually. In 2020, the amount of global surfactant production estimated would reach more than 24 million per year. However, the currently used surfactants are synthetically produced from chemical or petroleum-derived products, so it is often toxic and non-biodegradable. Rhamnolipids are “surfactant like” molecules produced by Pseudomonas aeruginosa, which could be alternatives for more environmentally friendly surfactants. The use of rhamnolipids is quite limited due to its expensive production cost. The production cost of rhamnolipid could be reduced using by agro-industrial by-product as a substrate. One of the abundant agro-industrial by-products in Indonesia that can be used as a substrate for rhamnolipid production is Oil Palm Empty Fruit Bunch (OPEFB). This study employed SuperPro Designer v9.5 to performed process simulation and economic assessment of rhamnolipid production using OPEFB as a substrate through two different purification methods, which are solvent extraction and chromatography adsorption. Based on the process simulation that has been done, the process that used adsorption chromatography purification methods more efficient in terms of the usage of the feedstock and energy. The economic assessment also showed that these methods were more profitable and economically attractive, with the value of NPV 11.400.000 USD, IRR 11,64%, and Payback Period 6,21 years.


      PubDate: Tue, 9 Feb 2021 00:00:00 +0100
       
 
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