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1st International Seminar on Science and Technology 2018, ISST 2018

作者： Oemaiya, D.V. Santoso, D. Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Indonesia Applied and Exploration Geophysics Research Group Faculty of Mining and Petroleum Engineering Institute Technology Bandung Indonesia

Krakatau is one of the volcano in Indonesia which has the destructive paroxysmal eruption. Eruption on 1883 was estimated had VEI of 6. The eruption was recorded as one among some most violent volcanic eruption event in the world. Gravity method is one of the geophysical methods that could delineate the subsurface structure base on density variation. Therefore, the objectives of this research are to reconstruct the 3D subsurface structure of the Krakatau volcano especially the approximate location and dimension of the magma chamber. The subsurface model of Krakatau was done by 3D modelling using residual anomaly map. In order to develop the status of magma chamber model, the available information on the geological map of Krakatau and surrounding area was used. Besides that, some information relative to the volcano such as the information derived from earthquake wave attenuation were utilized. The result of the study shows that position its volcano magma chamber is not directly vertical or oblique under the volcano crater and it has multiple chambers which trending northwest-southeast. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Volcanoes

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Effect of polyvinylidene fluoride concentration in PVDF-TiO₂-PVP composite membranes properties and its performance in bovine serum albumin rejection

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Case Studies in Chemical and Environmental engineering 2024年 9卷

作者： Gayatri, Rianyza Fizal, Ahmad Noor Syimir Yuliwati, Erna Zailani, Muhamad Zulhilmi Jaafar, Juhana Hossain, Md Sohrab Zulkifli, Muzafar Taweepreda, Wirach Ahmad Yahaya, Ahmad Naim Polymer Science Program Division of Physical Science Faculty of Science Prince of Songkla University Hat-Yai Songkhla 90110 Thailand Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Alor Gajah Melaka 78000 Malaysia Centre for Sustainability of Ecosystem & Earth Resources (Pusat ALAM) Universiti Malaysia Pahang Lebuh Persiaran Tun Khalil Yaakob Pahang Gambang 26300 Malaysia Program Study of Chemical Engineering Faculty of Engineering Universitas Muhammadiyah Palembang Jalan A.Yani 13 Ulu Kota Palembang 30263 Indonesia Advanced Membrane Technology Research Centre (AMTEC) Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Johor Skudai 81310 Malaysia HICoE-Centre for Biofuel and Biochemical Research Institute of Self-Sustainable Building Department of Fundamental and Applied Sciences Universiti Teknologi PETRONAS Perak Darul Ridzuan Seri Iskandar 32610 Malaysia Green Chemistry and Sustainability Cluster Universiti Kuala Lumpur Branch Campus Malaysian Institute of Chemical and BioEngineering Technology Alor Gajah Melaka 78000 Malaysia

In the present study, the polyvinylidene fluoride (PVDF) was incorporated with polyvinylpyrrolidone (PVP) and titanium dioxide (TiO2) nanoparticles to prepare PVDF-TiO2-PVP composite membrane for Bovine Serum Albumin ... 详细信息

In the present study, the polyvinylidene fluoride (PVDF) was incorporated with polyvinylpyrrolidone (PVP) and titanium dioxide (TiO₂) nanoparticles to prepare PVDF-TiO₂-PVP composite membrane for Bovine Serum Albumin (BSA) rejection from protein contaminated wastewater. The preparation of PVDF-TiO₂-PVP composite membrane was conducted by a non-solvent phase inversion (NIPS) process with varying PVDF weight percentages ranging from 16 to 19 wt%. The polymer concentration plays a critical role in the formation of composite membranes that is commonly overlooked. The primary goal of this study is to examine how the concentration of polymers affects the process of membrane creation, the ensuing structure, and the properties of these membranes. Presently, there is a restricted comprehension concerning the impact of PVDF polymer concentration in the fabrication of membranes using the NIPS approach, particularly for PVDF-TiO₂-PVP composite membranes. FE-SEM analysis revealed the lowest skin layer thickness and the number of macro-void formations in a PVDF composite membrane were at 16 wt% PVDF, compared to composite membranes over higher PVDF concentrations from 17 to 19 wt%. There were only slight variations in the percentages of individual elements across all PVDF-TiO₂-PVP membranes, yet the values were identical for C, O, F, and Ti. The viscosity was lowest at 16 wt percent PVDF (576.5 MPa s) and greatest at 19 wt percent PVDF (2054.3 MPa s). It showed that 19%wt PVDF viscosity increased fourfold higher than 16%wt. As the concentration of PVDF was increased, a related decrease in the surface porosity of the membrane was observed. The highest hydrophobicity with the contact angle of 79.62° of the composite membranes were detected at 19 wt% of PVDF loading. The maximum water flux (265.43 L/m²h) and BSA flux (250.31 L/m²h) were obtained at 19 wt% of PVDF loading. The lowest PVDF concentration of 16

关键词： Bovine serum albumin rejection Composite membrane Flat sheet Membrane separation Polymeric composite

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Review of smart grids advancements of energy mix sources

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AIP Conference Proceedings 2023年第1期2746卷

作者： A. N. Woro W. M. W. Muda A. Z. Annuar B. Syaiful Electrical Engineering Study Program Faculty of Engineering Pamulang University Pamulang Tangerang Selatan Banten Indonesia Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia Terengganu 2103 Kuala Nerus Terengganu Malaysia Electrical Engineering Department Faculty of Engineering Pamulang University Pamulang Tangerang Selatan Banten Indonesia. Centre for Nuclear Reactor Technology and Safety National Nuclear Energy Agency of Indonesia Tangerang Selatan Banten Indonesia

The successful implementation of smart grids depends on energy efficiency, mostly relying on the operation of electricity source infrastructure. The combination of energy sources undoubtedly provides complexity in real applications. Some of the challenges for a smart grids comes from the intermittent renewable energy characteristics such as bioenergy, geothermal, hydropower, solar, ocean power, and wind energy to the base load energy such as natural gas, coal, and nuclear. This paper aims to review the implementation of current advances of smart grids from combined energy mix sources. The review includes major components of smart grids, i.e. power plants, monitoring systems, substations, power transmission and distribution, controllers and smart meters. The review also investigates the state of the art contribution of power electronics, artificial intelligence and Internet of Things to more significant optimization, safety and efficiency in these areas. The results are expected to provide a further gap analysis of applicable technologies and best practices in mixed electricity generation sources. The final result will also consider its application in an archipelago country such as Indonesia.

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A Dual UPQC to Mitigate Sag/Swell, Interruption, and Harmonics on Three Phase Low Voltage Distribution System

A Dual UPQC to Mitigate Sag/Swell, Interruption, and Harmoni...

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Vocational Education and Electrical engineering, International Conference on

作者： Amirullah Adiananda Ontoseno Penangsang Adi Soeprijanto Electrical Engineering Study Program Faculty of Engineering Universitas Bhayangkara Surabaya Surabaya Indonesia Faculty of Intelligent Electrical and Informatics Technology Institut Teknologi Sepuluh Nopember Surabaya Indonesia

ISBN: (数字)9781728174341

ISBN: (纸本)9781728174358

The Unified Power Quality Conditioner (UPQC) is a combination of a series active filter (SeAF) and a shunt active filter (ShAF) connected in parallel by a DC link capacitor. This device can mitigate power quality (PQ) problems i.e. sag/swell, harmonics, and unbalance on the source and load bus of threephase three-wire (3P3W) on low voltage distribution systems simultaneously. The disadvantage of UPQC is that it is unable to overcome the voltage interruption so that the source can not deliver power to the load. This paper proposes a dual UPQC model to overcome the voltage interruption on the source bus so that the load bus continues to get power supply. There are six disturbance cases i.e. sinusoidal supply-sag-non-linear load (SSag-NL-L), sinusoidal supply-swell-NL-L (S-Swell-NL-L), sinusoidal-interruption-NL-L (S-Inter-NL-L), distorted supplysag-NL-L load (D-Sag-NL-L), distorted supply-swell-NL-L (DSwell-NL-L), and distorted supply-interruption-NL-LL (DInter-NL-L). The proportional Integral (PI) method is used to control the SeAF and the ShAF in the dual UPQC circuit model. The simulation results show that in the D-Inter-NL-LL case, a Dual UPQC model can maintain a load voltage magnitude of 266.60 V (voltage drop only of 14%), higher compared to a Single UPQC model of 173.97 V (voltage drop of 43.88%). In the same case, a dual UPQC model is capable of resulting in an average total harmonics distortion (THD) of load voltage of 10.10%, lower compared to a single UPQC model of 26.70%.

关键词： Low voltage Simulation Power quality Harmonic analysis Integrated circuit modeling Power harmonic filters Load modeling

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Managing laundry wastewater 1

Managing laundry wastewater

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1st International Conference on Smart City Innovation, ICSCI 2018

作者： Watiniasih, N.L. Purnama, I.G.H. Padmanabha, G. Merdana, I.M. Antara, I.N.G. Study Program of Biological Sciences Faculty of Mathematics and Natural Sciences Udayana University Indonesia Laboratory of Integrated Material Engineering and Environmental Technology Udayana University Indonesia Study Program of Public Health Faculty of Medicine Udayana University Indonesia Faculty of Veterinary Science Udayana University Indonesia Mechanical Engineering Study Program Faculty of Engineering Udayana University Jl. Raya Kampus UNUD Kampus Bukit Jimbaran Bali Jimbaran80361 Indonesia

Laundry services are emerging in every corner of Bali, particularly at suburban area, from cities to villages. These services help the community to ease their burden. However, the burden for the environment is increase. The wastewater from the laundries should be controlled, which should be handled natural ways. One way of reducing the dangerous chemical from the laundry wastewater can be done by Vertical-Sub-surface Flow Constructed Wetland system, using volcanic rocks as substrate of plant grow and the plant as filters. This study aimed to investigate the effectiveness of volcanic rock and Canna plants as a filter for the laundry wastewater. The volcanic rock as substrate for the plant grows was place in layers in a drum and the laundry wastewater was flowed. The parameter of wastewater laundry, such as TDS, BOD, COD and total phosphate were measured before and after treatment. The treatment was run for 6 weeks. The result shows that this system is effective that overall can reduce the parameter measured for 53.86%. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Volcanic rocks

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Geochemical characterization of thermal water springs in Barasanga field, North Konawe, Southeast Sulawesi

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AIP Conference Proceedings 2023年第1期2595卷

作者： Emi Prasetyawati Umar Jamaluddin Alfian Nawir Muhammad Altin Massinai Muhammad Fauzy Ismullah Massinai Anshariah Mining Engineering Department Faculty of Industrial Technology Universitas Muslim Indonesia Makassar Indonesia Geological Engineering Study Program STT Migas Balikpapan STT Migas Balikpapan Balikpapan Indonesia Geophysics Department Faculty of Math and Natural Science Hasanuddin University Makassar Indonesia

The geochemical method is one of the methods used to know the characteristics of hot spring, and the estimation of subsurface temperature or geothermal reservoir. Analysis of chemical properties of hot springs through thermal chemistry by using trilinear diagram. The methods used are literature study and field observations such as mapping the distribution of hot water spring, titrimetric laboratory analysis, gravimetric, and spectrophotometer for the analysis of hot water spring through the geochemical approach in determining the type of hot water spring. The average temperature of 480C and pH of 7,85, clear color, smelled sulfur and taste salty. The result on the percentage value of the ion content in the hot springs samples that have been analyzed their chemical content, especially the anion content of CI, SO42−, and HCO3− CO32− indicates that hot spring type of Barasanga is a type of chloride. This is indicated by the large chloride ion content ranging from 85.486% to 90.627%.

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Design of Hexapod Robot Movement Based on Arduino Mega 2560 1

Design of Hexapod Robot Movement Based on Arduino Mega 2560

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1st International Conference on Vocational Education and Technology, ICONVET 2018

作者： Ariawan, K.U. Santyadiputra, G.S. Sutaya, I.W. Electronics Engineering Study Program Technical and Vocational Faculty Universitas Pendidikan Ganesha Indonesia Informatics Engineering Education Departement Technical and Vocational Faculty Universitas Pendidikan Ganesha Indonesia

This study aims to design the movement of the hexapod robot so that it can move straight forward, turn 90 degrees forward, and move forward 180 degrees by applying the tripod gait method to produce a maximum movement pattern. The robot control system uses Arduino Mega 2560 to control the motion of 18 servo motors through the I2C interface servo motor driver - PCA9685. In straight forward motion testing, an average velocity of 6 cm/s was obtained, 90 degree forward motion testing obtained an average speed of 18 degrees/s, while the 180 degree rotational forward motion test also obtained an average speed of 18 degrees/s. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Machine design

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A Non-Linear Method for Hypocenter Determination around Central and East Java Region: Preliminary Result 2

A Non-Linear Method for Hypocenter Determination around Cent...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Muttaqy, Faiz Dian Nugraha, Andri Puspito, Nanang T Supendi, Pepen Rosalia, Shindy Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Bandung Indonesia

Java Island is highly active tectonic zone and also has a complex geological system as a result of Indo-Australian plate that subducted under the Eurasian plate. This complexity produces many large and destructive earthquakes. Moreover, Java is a most densely populated region in Indonesia. The precise earthquake location can define and evaluate the seismic hazard in the area. In this study, we determined hypocenter location around the central and east Java region by using a non-linear method. We manually picked P-and S-wave arrival time recorded by BMKG network for the time period of 2009 to 2017. We used the minimum 1D seismic velocity model of ak135 to locate the events. We used some criteria for the determination of event location including (i) at least recorded by 4 station which has clear onset P and S arrival, and (ii) has magnitude (MW) > 3. The seismicity in the study area is controlled by subduction and many active faults distributed along the Java Island, also clustered in several areas such as Kendeng thrust, Opak river fault, Kebumen, Banyuwangi, and others. The result of this study indicates the accurately main shallow seismicity zones in central and eastern part of Java region, and also confirm the presence of active inland faults. As further studies, we will conduct 1D velocity modeling and relocate the hypocenters using an updated local 1D velocity model beneath the study area. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Earthquakes

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Justification on cyclopropene to propyne isomerization pathway based on vibrational calculations 4

Justification on cyclopropene to propyne isomerization pathw...

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4th Padjadjaran International Physics Symposium 2019, PIPS 2019

作者： Madinah, R. Rusydi, F. Boli, L.S.P. Khoirunisa, V. Fahmi, M.Z. Zaidan, A.H. Research Center for Quantum Engineering Design Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia Department of Physics Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia Engineering Physics Study Program Institut Teknologi Sumatera Lampung35365 Indonesia Department of Chemistry Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia

We report a density-functional coupled with vibrational calculation on justifying the isomerization pathway of cyclopropene to propyne. The idea is to present the pathway in energy level diagram which the transition state is ensured by tracking a particular mode that supports the cyclic bond breaking and triple bond formation to occur. This mode decreases along the pathway and disappears at the transition state. To verify the designed pathway, the activation energy of the isomerization is used to find the rate constant with respect to experimental data at 500 K and 700 K by using transition state theory (TST). At those temperatures, TST predicts the rate constant at the same order of magnitude with the experimental result. It shows that the trend between calculation and experimental data is qualitatively in a good agreement, which implies that the designed pathway is justified. Furthermore, this study can be used as a guide if one needs to construct an isomerization pathway. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Rate constants

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Work system method as an e-learning design framework in private universities

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Journal of Physics: Conference Series 2021年第1期1810卷

作者： C E Supriana Informatics Engineering Study Program Faculty of Engineering Pasundan University Bandung Indonesia

The development of information and communication technology, especially the internet provides opportunities to improve the ability of lecturers to deliver courses to students without being limited by distance and time. This can be done by utilizing e-learning which will accelerate the transfer of knowledge and skills. E-learning is distance education that utilizes various digital tools and platforms. These tools and platform are used to support interaction, lectures and delivery of instructions between lecturers and students. This study will discuss the use of work system methods and the use of e-learning technology in a business entity. The work system methods are used to design information systems. Meanwhile e-learning technology in a business entity serves lecturers and students, conduct lectures at private universities in increasing knowledge dissemination, educational affordability and the use of technology and information as its support. The result of this research is the works system method model which refers to the analysis of data from the internet accessibility survey of students, analysis of its components, the system development cycle, the revision of the vision, mission and resources in private universities and recommendations of opportunities for the development of higher quality e-learning implementation.

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