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Journal of Environmental Sciences 2007年第6期19卷 663-666页

作者： prabowo benedictus VERIANSYAH Bambang KIM Jae-Duck Supercritical Fluid Research Laboratory Korea Institute of Science and Technology(KIST)-Department of Green Process and System EngineeringUniversity of Science and Technology(UST)39-1 Hawolgok-dongSeoungbuk-gu Seoul136-791Korea.

Hydrothermal decomposition of pentachlorophenol （PCP, C6HC150）, as the probable human carcinogen, was investigated in a tubular reactor under subcritical and supercritical water with sodium hydroxide （NaOH） addition. The experiments were conducted at a temperature range of 30（0-420℃ and a fixed pressure of 25 MPa, with a residence time that ranged from 10 s to 70 s. Under the reaction conditions, the initial PCP concentrations were varied from 0.25 to 1.39 mmol/L, and the NaOH concentrations were varied from 2.5 to 25 times of the concentrations of PCP. The result of this study showed that PCP conversion in supercritical water was highly dependent on the reaction temperature, residence time, and NaOH concentration. PCP conversion in subcritical water is, however, only dependent on reaction temperature. NaOH concentration and residence times were found to have little effect on PCP conversion in subcritical condition. It was found that NaOH concentration affected the dechlorinations of PCP in the supercritical water. The intermediates detected were proposed to be tetrachlorophenol and trichlorophenol, respectively.

关键词： pentachlorophenol hydrothermal decomposition supercritical water suberitical water

Investigation on Savonius turbine technology as harvesting instrument of non-fossil energy: Technical development and potential implementation

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Theoretical & Applied Mechanics Letters 2020年第4期10卷 262-269页

作者： Aditya Rio prabowo Dandun Mahesa prabowoputra Department of Mechanical Engineering Universitas Sebelas MaretSurakarta 57126Indonesia Graduate School of Mechanical Engineering Universitas Sebelas MaretSurakarta 57126Indonesia

Environmental risk due to excessive residual emission is rising. Greenhouse effect, ice melting in the Arctic, reduction of air quality are several concerns which need immediate development and change. Energy harvesting equipment is one of the key solutions. Environment potential, e.g. water resource can be collaborated with mechanical equipment to harvest clean energy. Savonius turbine has been proposed and studied for this purpose and can be placed on several energy resources, i.e. water and wind. Still, real-world implementation of this technology is lacking,especially in tropical archipelago countries which have abundant water resources. In this work,assessment of Savonius turbine technology as instrument to harvest clean energy is conducted. A series of development on the turbine performance and technical modification is considered as reference to implement the technology in water and open air environments. It is noted that rotor design, operation depth and nozzle attachment are several key influencing factors.

关键词： Savonius turbine Environment pollution Revenue cost Water operation Wind-energy harvest

Pilot scale autothermal gasification of coconut shell with CO2-O2 mixture

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Frontiers in Energy 2015年第3期9卷 362-370页

作者： Bayu prabowo Herri SUSANTO Kentaro UMEKI Mi YAN Kunio YOSHIKAWA Department of Environmental Science and Technology Tokyo Institute of Technology Yokohama 226-8503 Japan Institute of Energy and Power Engineering Zhejiang University of Technology Hangzhou 310014 China Department of Chemical Engineering Institut Teknologi Bandung Bandung 40132 Indonesia Division of Energy Science Lulea University of Technology Lulea 971 87 Sweden Institute of Energy and Power Engineering Zhejiang University of Technology Hangzhou 310014 China Department of Environmental Science and Technology Tokyo Institute of Technology Yokohama 226-8503 Japan

This paper explored the feasibility and benefit of CO2 utilization as gasifying agent in the autothermal gasification process. The effects of CO2 injection on reaction temperature and producer gas composition were examined in a pilot scale downdraft gasifier by varying the CO2/C ratio from 0.6 to 1.6. O2 was injected at an equivalence ratio of approximately 0.33-0.38 for supply- ing heat through partial combustion. The results were also compared with those of air gasification. In general, the increase in CO2 injection resulted in the shift of combustion zone to the downstream of the gasifier. However, compared with that of air gasification, the long and distributed high temperature zones were obtained in CO2-O2 gasification with a CO2/C ratio of 0.6-1.2. The progress of the expected CO2 to CO conversion can be implied from the relatively insignificant decrease in CO fraction as the CO2/C ratio increased. The producer gas heating value of CO2-O2 gasification was consistently higher than that of air gasification. These results show the potential of CO2-O2 gasification for producing high qualityproducer gas in an efficient manner, and the necessity for more work to deeply imply the observation.

关键词： Keywords biomass gasification CO2 downdrafl gasifier,autothermal

Exploring the potential of graphene materials in marine and shipping industries-A technical review for prospective application on ship operation and material-structure aspects

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Journal of Ocean Engineering and Science 2021年第3期6卷 299-316页

作者： Dharu Feby Smaradhana Aditya Rio prabowo Andita Nataria Fitri Ganda Department of Mechanical Engineering Universitas Sebelas MaretSurakartaIndonesia Department of Aeronautics Imperial College LondonLondonUnited Kingdom Department of Mechanical Engineering Universitas Negeri SurabayaSurabayaIndonesia

Advance development of materials technology introduces graphene as a powerful material for various applications in any branch of engineering and *** and shipping are one of the projected industries which are affected by graphene *** conventional approach of technical manufactures and processes on ship and maritime environments,such as water treatment,oil separation and evacuation,is proven to be developed into more practical ways by utilizing characteristics and properties of graphene-based *** work is addressed to study graphene as an engineering material in which structural arrangement,mechanical strength,electrical conductivity,and permeability of the material are *** and cycle applications related to ship operations are defined to be an initial milestone to assess dedicated works in graphene and *** and future projections based on the works are linked with existing challenges and problems on boards,such as free surface effects and materials *** works showed that graphene-based baffle has the potential to replace the current baffle style in oil tankers and liquid *** electrical conductivity of the graphene is also useful for structural coating for ships that can operate in extremely cold regions,e.g.,the Arctic and Antartica.

关键词： Graphene Marine and shipping industries Characteristics and properties Water treatment Baffle Coating.

Crashworthiness assessment of thin-walled double bottom tanker: A variety of ship grounding incidents

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Theoretical & Applied Mechanics Letters 2019年第5期9卷 320-327,I0005页

作者： Aditya Rio prabowo Sukmaji Indro Cahyono Jung Min Sohn Department of Mechanical Engineering Sebelas Maret UniversitySurakartaIndonesia Department of Naval Architecture and Marine Systems Engineering Pukyong National UniversityBusanSouth Korea

This study addresses the issue of ship accidental grounding as an impact phenomenon,with the assumption that an interaction of its structure with the oceanic seabed(obstruction),idealized as rock topology,is capable of initiating a so-called hard ground *** occurrence variation was considered by performing two main instances,encompassing raking and stranding,often experienced by oil/chemical tankers as thin-walled *** addition,a failure criterion was implemented on the structural geometry,in order to define its ultimate limit and possible damage,during interaction with the ***,the analysis results were compiled to assess structural crashworthiness as well as progressive failure of the double bottom part of the tanker,where energy criterion indicated the raking to be more ***,detailed observation of the failure sequence indicated the stranding to have successfully breached the inner bottom shell.

关键词： Bottom raking Ship stranding Finite element analysis Crashworthiness criteria Progressive structural failure

Investigation of Agave cantala-based composite fibers as prosthetic socket materials accounting for a variety of alkali and microcrystalline cellulose treatments

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Theoretical & Applied Mechanics Letters 2020年第6期10卷 405-411页

作者： Sakuri Sakuri Eko Surojo Dody Ariawan Aditya Rio prabowo Department of Mechanical Engineering STT Wiworotomo PurwokertoBanyumas 53134Indonesia Department of Mechanical Engineering Universitas Sebelas MaretSurakarta 57126Indonesia

This study was aimed to determine the mechanical strength of composites made from Agave cantala with an unsaturated polyester matrix and microcrystalline *** fiber(CF)was treated with 6%Na OH with immersion times of 0 h(UF),3 h(AK3),6 h(AK6),9 h(AK9),and12 h(AK12).Thermogravimetric analysis(TGA)analysis shows that treated CF has higher thermal stability than CF without *** fiber was tested by X-ray *** alkali treatment with a 6-h soaking,it had a crystallinity index of 73.65%.Scanning electron microscopy(SEM)showed that the fibers were cleaner after alkali treatment because hemicellulose,wax,and other impurities were *** of the contact angle and surface energy showed that treated CF has smaller contact angles and greater surface energy.

关键词： Cantala fiber Microcrystalline cellulose Prosthetic socket Tensile and flexural characteristics

Crashworthiness assessment of thin-walled double bottom tanker: Influences of seabed to structural damage and damage-energy formulae for grounding damage calculations

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Journal of Ocean Engineering and Science 2020年第4期5卷 387-400页

作者： Aditya Rio prabowo Bo Cao Jung Min Sohn Dong Myung Bae Department of Mechanical Engineering Universitas Sebelas MaretSurakartaIndonesia China Shipbuilding Industry Corporation Economic Research Center BeijingChina Department of Naval Architecture and Marine Systems Engineering Pukyong National UniversityBusanSouth Korea

This work presents results of numerical analyses with focus on structural performance accounting for seabed topology,and investigation of energy formulae for application in calculation of grounding *** in this work is divided into three stages,*** element method(FEM)verification using laboratory experiment,numerical calculation of ship grounding using FEM,and comparison of the FEM results with empirical formulae of damage-energy *** formula of Minorsky is considered with other improvement expression,such as Woisin and *** suggested that the recent-developed expression produces the closest estimation to the verified FEM *** the other hand,fundamental formulae of Minorsky is the farthest compared to the FEM,which indicates constant value in the expression needs to be more specific as improved in the Woisin formula.

关键词： Ship grounding impact test finite element method damage-energy formula crashworthiness criteria

Nano-film aluminum-gold for ultra-high dynamic-range surface plasmon resonance chemical sensor

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Frontiers of Optoelectronics 2019年第3期12卷 286-295页

作者： Briliant Adhi prabowo Dewa Putu HERMIDA Robeth Viktoria MANURUNG Agnes PURWIDYANTRI Kou-Chen LIU Research Center for Electronics and Telecommunications Indonesian Institute of SciencesBandung 40135Indonesia Department of Electronics Engineering Chang Gung UniversityTaoyuan 33302TaiwanChina Biosensor Group Chang Gung UniversityTaoyuan 33302TaiwanChina Research Unit for Clean Technology Indonesian Institute of SciencesBandung 40135Indonesia Division of Pediatric Infectious Disease Department of PediatricsChang Gung Memorial HospitalTaoyuan 33305TaiwanChina Department of Materials Engineering Ming Chi University of TechnologyNew Taipei City 24301TaiwanChina

An analytical and experimental study of nanofilm aluminum (Al) for ultra-high dynamic range surface plasmon resonance (SPR) biosensor is presented in this article. A thin film of 16 nm Al is proposed for metallic sensing layer for SPR .s*ensoi For the protective layer, a 10 nm of gold (Au) layer was configured on top of Al as a protection layer. This ultra-high dynamic range of SPR biosensor reached the bulk refractive index sample limit up to 1.45 RIU. For the analytical study, with the assumption of anisotropic refractive indices experiment, the dynamic range showed a refractive index value of around 1.58 RIU. The refractive index value limit achieved by the proposed sensing design is potentially implemented in various applications, such as in chemical detection and environ- mental monitoring study with high refractive index solution sample. The experimental results are presented as a proof-of-concept of the proposed idea.

关键词： dynamic range surface plasmon resonance (SPR) sensor aluminum (Al) gold

Assessment of corrected time-step method for nominal ionospheric gradient calculation: A comparative analysis with spatial approaches

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Earth and Planetary Physics 2024年第4期8卷 641-649页

作者： Slamet Supriadi Prayitno Abadi Susumu Saito Harry Bangkit Dwiko Unggul prabowo Adi Purwono Ginaldi Ari Nugroho Research Center for Smart Mechatronics National Research and Innovation Agency(BRIN)BandungIndonesia Research Center for Climate and Atmosphere BRINBandungIndonesia School of Electrical Engineering Telkom UniversityKab.BandungIndonesia Electronic Navigation Research Institute National Institute of MaritimePort and Aviation TechnologyTokyoJapan Research Center for Space BRINBandungIndonesia

The effect of ionospheric delay on the ground-based augmentation system under normal conditions can be mitigated by determining the value of the nominal ionospheric gradient(σvig).The nominal ionospheric gradient is generally obtained from Continuously Operating Reference Stations data by using the spatial single-difference method(mixed-pair,station-pair,or satellite-pair)or the temporal single-difference method(time-step).The time-step method uses only a single receiver,but it still contains ionospheric temporal *** introduce a corrected time-step method using a fixed-ionospheric pierce point from the geostationary equatorial orbit satellite and test it through simulations based on the global ionospheric *** also investigate the effect of satellite paths on the corrected time-step method in the region of the equator,which tends to be in a more north–south direction and to have less coverage for the east–west ionospheric *** study also addresses the limitations of temporal variation correction coverage and recommends using only the correction from *** processes are developed under simulations because observational data are still difficult to *** findings demonstrate that the corrected time-step method yieldsσvig values consistent with other approaches.

关键词： ground-based augmentation system nominal ionospheric gradient time-step correction global ionospheric model

Assessment of the stiffened panel performance in the OTEC seawater tank design:Parametric study and sensitivity analysis

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Theoretical & Applied Mechanics Letters 2023年第4期13卷 261-271页

作者： Yogie Muhammad Lutfi Ristiyanto Adiputra Aditya Rio prabowo Tomoaki Utsunomiya Erwandi Erwandi Nurul Muhayat Department of Mechanical Engineering Universitas Sebelas MaretSurakarta 57126Indonesia Research Center for Hydrodynamics Technology National Research and Innovation Agency(BRIN)Surabaya 60117Indonesia Department of Marine Systems Engineering Kyushu UniversityFukuoka 819-0395Japan

Ocean thermal energy conversion(OTEC)is a process of generating electricity by exploiting the temperature difference between warm surface seawater and cold deep *** to the high static and dynamic pressures that are caused by seawater circulation,the stiffened panel that constitutes a seawater tank may undergo a reduction in ultimate *** current paper investigates the design of stiffening systems for OTEC seawater tanks by examining the effects of stiffening parameters such as stiffener sizes and span-over-bay ratio for the applied combined loadings of lateral and transverse pressure by fluid motion and axial compression due to global bending *** ultimate strength calculation was conducted by using the non-linear finite element method via the commercial software known as *** stress and deformation distribution due to pressure loads was computed in the first step and then brought to the second step,in which the axial compression was *** effects of pressure on the ultimate strength of the stiffener were investigated for representative stiffened panels,and the significance of the stiffener parameters was assessed by using the sensitivity analysis *** a result,the ultimate strength was reduced by approximately 1.5%for the span-over-bay ratio of 3 and by 7%for the span-over-bay ratio of 6.

关键词： Ocean thermal energy conversion(OTEC) Seawater tank Stiffened panels Numerical analysis Combined loadings