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Energy Engineering 2021年第1期118卷 189-197页

作者： Riina Syivarulli Nugroho Agung Pambudi mochamad syamsiro Lip Huat Saw Graduate Program of Vocational Teacher Education Sebelas Maret UniversitySurakarta57126Indonesia Department of Mechanical Engineering Education Sebelas Maret UniversitySurakarta57126Indonesia Department of Mechanical Engineering Janabadra UniversityYogyakarta55231Indonesia Lee Kong Chian Faculty of Engineering and Science UTARKajang43000Malaysia

One of the major problems faced in managing biomass waste to higher quality products is choosing the right *** are used as an alternative fuel,with increase in the calorific *** carbonization(HTC)is a biomass conversion technology,used to obtain solid *** study aims to utilize of Calophyllum inophyllum as an alternative solid fuel through *** calorific value and proximate of the hydrochar will be determined and analyzed to find out its *** experiments were carried out at temperature variations of 160℃,190℃,and 220℃ and holding times of 30 and 60 *** results show that an increase in temperature and holding time causes a decline in the moisture content 1.87%,volatile matter 54.03%,and ash content 12.35%,respectively,leading to elevations in the fixed carbon at 31.75%.In addition,the highest calorific value of 4149 Kcal/Kg was produced at a temperature of 220℃,within a holding time of 60 *** results showed a significant increase in the quality of solid fuels between 3500–4611 Kcal/Kg in accordance with the American Standard Testing and Materials(ASTM).Therefore,this research leads to an important finding that Calophyllum inophyllum waste through the HTC process can be used as an alternative fuel to substitute lignite coal,which is environmentally friendly.

关键词： Hydrothermal carbonization solid fuel Calophyllum inophyllum Nyamplung

Preparation and Characterization of Thermoplastic Starch from Sugar Palm (Arenga pinnata) by Extrusion Method

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Journal of Renewable Materials 2023年第4期11卷 1963-1976页

作者： Muhammad Ghozali Yenny Meliana Widya Fatriasari Petar Antov mochamad Chalid Departement of Metallurgy and Material Universitas IndonesiaDepok16424Indonesia Research Center for Chemistry National Research and Innovation Agency(BRIN)Kawasan PUSPIPTEK SerpongTangerang Selatan15314Indonesia Research Center for Biomass and Bioproducts National Research and Innovation Agency(BRIN)Jl Raya Bogor KM 46 CibinongBogor16911Indonesia Faculty of Forest Industry University of ForestrySofia1797Bulgaria

Sugar palm(Arenga pinnata)starch is considered an important renewable,biodegradable,and eco-friendly polymer,which is derived from agricultural by-products and residues,with great potential for the development of biocomposite *** research was aimed at investigating the development of TPS biocomposites from *** palm starch using an extrusion *** starch,glycerol,and stearic acid were extruded in a twin-screw *** electron microscopy(SEM)analysis of TPS showed that the starch granules were damaged and gelatinized in the extrusion *** density of TPS was 1.3695 g/mL,lower than that of palm starch,and the addition of stearic acid resulted in increased TPS density.X-ray diffraction(XRD)results showed that palm starch had a C-type pattern crystalline *** tensile strength,elongation at break,and modulus of elasticity of TPS were 7.19 MPa,33.95%,and 0.56 GPa,*** addition of stearic acid reduced the tensile strength,elongation at break and modulus of elasticity of *** rheological properties,i.e.,melt flow rate(MFR)and viscosity of TPS,were 7.13 g/10 min and 2482.19 Pa.s,*** presence of stearic acid in TPS resulted in increased MFR and decreased viscosity *** peak gelatinization temperature of *** palm starch was 70°C,while Tg of TPS was 65°*** addition of stearic acid reduced the Tg of *** thermogravimetric analysis(TGA)analysis showed that the addition of glycerol and stearic acid decreased the thermal stability,but extended the temperature range of thermal *** derived from *** palm starch by extrusion method has the potential to be applied in industrial practice as a promising raw material for manufacturing bio-based packaging as a sustainable and green alternative to petroleum-based plastics.

关键词： Arenga pinnata sugar palm starch thermoplastic starch glycerol stearic acid twin-screw extruder biocomposites

Abaca Fiber as a Potential Reinforcer for Acoustic Absorption Material at Middle-High Frequencies

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Journal of Renewable Materials 2024年第5期12卷 909-921页

作者： Susilo Indrawati Lila Yuwana Suyatno mochamad Zainuri Darminto Department of Physics Faculty of Science and Data AnalyticsInstitut Teknologi Sepuluh NopemberSurabaya60111Indonesia

Recently,abacaﬁbers have become the focus of specialized research due to their intriguing characteristics,with their outstanding mechanical properties being a particularly *** the conducted study,the abacaﬁbers underwent a preliminary treatment process involving an alkaline solution,which was composed of 0.5%sodium hydroxide(NaOH)and 50%acetic acid(CH3COOH).This process entailed immersing eachﬁber in the solution for a period of one *** treatment led to a 52.36%reduction in lignin content compared to the levels before treatment,resulting in a dramatic decrease in the full width at half maximum(FWHM)in the XRD spectra from 1.13 to *** change indicates that theﬁbers became more crystalline following the *** abacaﬁbers were also characterized using BET(Brunauer Emmett Teller)measurements,which revealed that the aver-age pore length ranged from 33–49 nm and the surface area was between 13–28 m^(2)·g^(-1).The morphology of the abacaﬁber after alkali an hydrolisis treatment(AFAH)appeared rougher and more *** measurements revealed a signiﬁcant rise in the storage modulus of the singleﬁber post-treatment,with dependencies on both frequency and *** exhibited an optimal absorption coefﬁcient ofα=0.9 for frequencies above 2500 *** combined effect of alkalization and hydrolyzation treatments,while resulting in an enhancement in the mechanical properties of theﬁbers,also reduced high-intensity noise produced by sources such as machin-ery,aircraft takeoffs and landings,etc.,across a broader working frequency range.

关键词： Abacaﬁber alkalization mechanical property acoustic characteristics middle frequency

Generating soil salinity, soil moisture, soil pH from satellite imagery and its analysis

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Information Processing in Agriculture 2020年第2期7卷 294-306页

作者： mochamad Firman Ghazali Ketut Wikantika Agung Budi Harto Akihiko Kondoh Center for Remote Sensing Bandung Institute of Technology(CRS-ITB)BandungIndonesia Remote Sensing and GIS Research Group Faculty of Earth Science and TechnologyBandung Institute of TechnologyBandungIndonesia ForMIND Institute Indonesia Center for Environmental Remote Sensing(CeRES) Chiba UniversityJapan Department of Geodesy and Geomatics Engineering Faculty of EngineeringUniversity of LampungIndonesia

In an agricultural field,the water content and salt content are defined as soil moisture and soil salinity and have to be estimated *** changing of these two factors can be assessed using remote sensing *** study was conducted by analysing the Landsat 8 satellite images,soil data of field surveys,laboratory analyses and statistical *** properties such as soil moisture and soil salinity were estimated using soil moisture index(SMI)and soil salinity index(SSI),*** research combined and integrated the soil data from survey and laboratory with Landsat 8 satellite images to build two multiple regression equations model named the soil pH Index(SpHI).They are based on bare soil and paddy leaf models as the explanatory factors of soil moisture and soil salinity *** the computation processes were replicated three times using three different dates of Landsat 8 satellite images to produce the multi-temporal *** moisture increased after 30 days,while the salt content was only trace *** proposed models detected 4.49–7.59 of soil pH,4.66 in bare soil model and 6.62 in paddy leaf *** the planting period,the soil pH in bare soil model decreased to 2.12–6.47 while the paddy leaf model increased to 4.49–7.59 with RMSE 1.40 and PRMSE 24%of *** spatial relationship between soil pH,soil salinity and soil moisture are linear but varied in correlation level from weak,moderate to *** on the bare soil model,the relationship between soil pH and soil moisture shows a weak negative relationship with R28.37%and a strong positive relationship with R281.94%in paddy area and bare soil area respectively,as like as in paddy area based on the paddy leaf model with R2100%.The relationship between soil temperature and soil pH shows a weak negative relationship for all models and a moderate negative relationship of soil salinity and soil pH in bare soil area based on the bare soil model with R234.89%.

关键词： Landsat 8 Soil moisture index Soil salinity index Soil pH Paddy leaf model Bare soil model

Techno-economic analysis of green hydrogen production by a floating solar photovoltaic system for industrial decarbonization

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Clean Energy 2024年第4期8卷 1-14页

作者： Rahma Muthia Anastasia Segari Putri Pramudya mochamad Rafly Maulana Widodo Wahyu Purwanto Department of Chemical Engineering Faculty of EngineeringUniversitas IndonesiaDepok16424Indonesia Sustainable Energy Systems and Policy Research Cluster Universitas IndonesiaDepok16424Indonesia Master Program in Energy Systems Engineering Faculty of EngineeringUniversitas IndonesiaDepok16424Indonesia

This study proposes a conceptual design of green hydrogen production via proton exchange membrane electrolysis powered by a floating solar photovoltaic *** system contributes to industrial decarbonization in which hydrogen blending with natural gas is proposed as an approach to smooth the energy *** proposed design addresses the challenge of supplying a continuous flow-rate of green hydrogen,which is typically demanded by industrial end *** study particularly considers a realistic area required for the installation of a floating solar photovoltaic *** enable the green hydrogen production of 7.5 million standard cubic feet per day,the required structure includes the floating solar photovoltaic system and Li-ion batteries with the nominal capacities of 518.4 megawatts and 780.8 *** is equivalent to the requirement for 1524765 photovoltaic modules and 3718 Li-ion *** assessment confirms the technical viability of the proposed concept of green hydrogen production,transportation and *** the present commercialization is hindered by economics due to a high green hydrogen production cost of USD 26.95 per kg,this green hydrogen pathway is expected to be competitive with grey hydrogen produced via coal gasification and via natural gas steam reforming by 2043 and 2047,respectively.

关键词： floating solar photovoltaics gas blending green hydrogen industrial decarbonization lithium-ion battery photon exchange membrane electrolysis

Structure,Dynamic-Mechanical and Acoustic Properties of Oil Palm Trunk Modified by Melamine Formaldehyde

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Journal of Renewable Materials 2021年第9期9卷 1647-1660页

作者： Tetti Novalina Manik Sulung Apria Nuki Nur Aini Fauziyah Mashuri mochamad Zainuri Darminto Department of Physics Faculty of Science and Data AnalyticsInstitut Teknologi Sepuluh NopemberSurabaya60111Indonesia Physics Study Program Faculty of Mathematics and Natural SciencesUniversitas Lambung MangkuratBanjarbaru70714Indonesia

The performance of oil palm trunk wastes from Banjarbaru of South Kalimantan was improved with the help of chemical modification in a two-step *** first was formalization with formaldehyde solution with varying pH,and the second was impregnation with melamine-formaldehyde resin under 5 bar pressure for an *** these processes,the samples were cured at 120℃ for 10 min and then dried in an oven at(103±2)℃ in order to attain a moisture content of less than 6%.These treatments improved the physical properties(density,moisture content,and volume swelling),mechanical resistance,dynamic-mechanical and acoustic performance of the *** combination of impregnation and formalization changed the structure and the morphology of the woods such that the surface became flatter and *** was confirmed by results from FTIR,SEM,and *** with alkaline modification displayed the best results for dimensional stability,storage modulus,and damping factor in varied *** treatments in this study also heightened acoustic performances as evidenced by the resulting characteristics of sound absorption coefficient and acoustic impedance.

关键词： Acoustic performances dynamic-mechanical formalization oil palm trunk

Green Chemistry of Cellulose Acetate Membrane Plasticized by Citric Acid and Succinonitrile for Lithium-Ion Battery Application

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Journal of Renewable Materials 2024年第11期12卷 1863-1878页

作者： Christin Rina Ratri Qolby Sabrina Adam Febriyanto Nugraha Sotya Astutiningsih mochamad Chalid Green Polymer Technology Laboratory Department of Metallurgical and Materials EngineeringFaculty of EngineeringUniversitas IndonesiaDepokJawa Barat16424Indonesia Research Center for Advanced Materials National Research and Innovation AgencyKST BJ Habibie Gd.440-441Tangerang SelatanBanten15314Indonesia

Commercial lithium-ion batteries(LIBs)use polyolefins as *** has led to increased research on separators composed of renewable materials such as cellulose and its *** this study,the ionic conductivity of cellulose acetate(CA)polymer electrolyte membranes was enhanced via plasticization with citric acid and *** primary objective of this study was to evaluate the effectiveness of these plasticizers in improving cellulose-based separator membranes in *** membranes were fabricated using solution casting technique and then plasticized with various concentrations of *** structural,thermal,and electrochemical properties of the resulting membranes were characterized using Fourier Transform infrared(FTIR)spectroscopy,X-Ray Diffraction(XRD),Differential Scanning Calorimetry(DSC),Thermogravimetric Analysis(TGA),and Electrochemical Impedance Spectroscopy(EIS).The FTIR and XRD results confirmed the successful incorporation of citric acid and succinonitrile into the polymer matrix,while the TGA analysis demonstrated the enhanced thermal stability of the plasticized *** shift in the glass transition temperature was determined by DSC *** notably,the EIS results revealed a significant increase in ionic conductivity,achieving a maximum of 2.7×10^(-5) S/cm at room *** improvement was attributed to the effect of plasticizers,which facilitated the dissociation of lithium salts and increase the mobility of the lithium *** ionic conductivities of plasticized CA membranes are better than those of unmodified CA membranes and commercially available Celgard separator membranes:4.7×10^(-6) and 2.1×10^(-7) S/cm,*** findings suggest that citric acid and succinonitrile are effective plasticizers for cellulose acetate membranes,making them promising substitutes for commercial polyolefin separators in LIB applications.

关键词： Cellulose polymer electrolyte natural plasticizer citric acid succinonitrile

Computational modelling and simulation to mitigate the risk of daylight exposure in tropical museum buildings

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Energy and Built Environment 2024年第2期5卷 171-184页

作者： Rizki A.Mangkuto Tommy Partogi Simamora Desliana Putri Pratiwi mochamad Donny Koerniawan Building Physics Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungBandungIndonesiaJl.Ganesha 10Labtek VIBandung 40132Indonesia Engineering Physics Program Faculty of Industrial TechnologyInstitut Teknologi BandungBandungIndonesiaJl.Ganesha 10Labtek VIBandung 40132Indonesia Building Technology Research Group School of ArchitecturePlanningand Policy DevelopmentInstitut Teknologi BandungBandungIndonesiaJl.Ganesha 10Labtek IXBBandung 40132Indonesia

In museum design and operation,daylight is typically discouraged due to high risk of damaging the display ***,past studies in high-latitude regions have shown the possibility to apply daylight in museums,so long as it is carefully planned,and the display objects are not from the category of high responsive *** the tropical region,the influence of daylighting on light exposure on museum objects is still *** study therefore aims to assess and mitigate the impact of annual daylight exposure on objects with low responsive materials in a tropical daylit museum *** daylight modelling and simulation are performed to achieve the objective,followed with Morris sensitivity analysis and Mahalanobis distance classifier to optimise the *** is found that either WWR or glazing transmissivity gives the greatest influence on the performance *** on the proposed optimisation algorithm,it is possible to determine the optimum solutions satisfying the performance indicators target,for a certain opening ***,the contribution of this study is the proposed computational modelling and simulation methods to mitigate the exposure risk while optimising daylight as a renewable energy source.

关键词： Daylighting Museum Computational modelling Simulation Annual light exposure

Radiogenic geothermal systems of Bangka Island,Indonesia:Implications of high heat production and tectonic framework

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Energy Geoscience

Energy Geoscience 2024年第4期5卷 89-107页

作者： Rahmat Nawi Siregar mochamad Nukman Kurnia Setiawan Widana Agung Harijoko Sismanto Sismanto Department of Physics Universitas Gadjah MadaSekip Utara55281Indonesia Department of Physics Institut Teknologi SumateraIndonesia Research Center for Nuclear Fuel Cycle and Radioactive Waste Technology BRINIndonesia Department of Geological Engineering Universitas Gadjah MadaIndonesia

The presence of geothermal manifestation in Bangka Island(Southeast Sumatra,Indonesia)with the absence of Quaternary volcanic activity and also relatively low seismicity events has raised intriguing questions on the control of the geothermal system in this *** the regional tectonic setting of Indonesia volcanic geothermal systems has been known,that of non-volcanic geothermal systems such as radiogenic system become an issue to be *** study reports the geochemistry and petrography analysis of Triassic granite related to radiogenic production at the vicinity of hot springs in Bangka *** temperatures of the Bangka hot springs range from 37 to 70.7 and pH values vary between 5.6 and *** hot springs are discharging either in close to massive granite bodies or occur in between two major NE-SW striking faults zones,i.e.,Pemali fault and Payung *** results indicate the average radiogenic heat production of Late Triassic Klabat granite in the northern area ranges from 28.5 to 38.34μWm^(-3)and the southern area ranges from 28.3 to 49.5μWm^(-3).In comparison to similar granite belt located in Malaysia,heat production of granitoid in Bangka hot springs is four times higher,possibly due to their different granite origins.

关键词： Radiogenic geothermal Radiogenic heat production Granite Radioactive element

Impact of different kinds of biomass mixtures on combustion performance, interaction and synergistic effects in cofiring of coal and biomass in steam power plants

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Clean Energy 2023年第5期7卷 1136-1147页

作者： mochamad Soleh Azaria Haykal Ahmad Firman Bagja Juangsa Prihadi Setyo Darmanto Ari Darmawan Pasek Mechanical Engineering Doctoral Program Study Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Mechanical Engineering Master Program Study Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Energy Conversion Research Group Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Research Center for New and Renewable Energy Institut Teknologi BandungJl.Ganesha 10Bandung40132 Indonesia Research and Development Center PT.PLN Indonesia Power

The cofiring of biomass and coal may be one of the most effective methods to improve energy utilization efficiency and reduce greenhouse gas *** study aims to investigate combustion performance,interaction and synergistic effects in the cofiring of coal and three types of *** fuel consisting of coal and three types of biomass such as sawdust,rice husk and solid recovery fuel was selected as the research *** and proximate analysis and differential thermogravimetric analysis with heating rates of between 10°C and 40°C/minute are used to analyse combustion *** of combustion in a 600-MWe steam power plant with a Carolina-type boiler is also carried out with the help of computational fluid dynamic(CFD)analysis to see the effect of the interaction and synergy of the mixed fuel on the performance of the steam *** effect on the com-bustion process in the combustion chamber of a steam power plant is also *** on the analysis of several test results of parameters such as ignition temperature,burnout temperature,calorific value of the fuel mixtures as well as CFD simulation,the results of the study show a strong indication of a positive synergy in mixing some of these biomasses as compared with a fuel mix-ture consisting only of coal and one type of *** no power derating of the boiler occurs until the biomass content in the fuel mixture is~30%on a mass *** reduction in greenhouse gas emissions also appears significant from the results of the CFD simulation of this study,which is characterized by a decrease in the fraction of CO_(2) in flue gas from 21.5%for coal alone as fuel to 15.9%in the case of cofiring excluding the CO_(2) attributed to the biomass.

关键词： biomass sawdust cofiring coal-fired power plant combustion decarbonization computational fluids dynamic