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Influence of Formulation and Hot-Pressing Conditions on the Performance of Bio-Based Molasses Adhesive for Plywood

Journal of Renewable Materials 2024年第8期12卷 1383-1397页

作者： Jajang Sutiawan Alifah Syahfitri Sukma Surya Kusumah dede hermawan Rita Kartika Sari Luthfi Hakim Efri Mardawati Muhammad Adly Rahandi Lubis Research Center for Biomass and Bioproducts National Research and Innovation AgencyCibinong16911Indonesia Forest Product Department Faculty of Forestry and EnvironmentIPB UniversityBogor16680Indonesia Department of Forest Products Faculty of ForestryUniversitas Sumatera UtaraMedan20155Indonesia Research Collaboration Center for Biomass and Biorefinery BRIN and Universitas PadjadjaranBandung40600Indonesia Department of Agro-Industrial Technology Universitas PadjadjaranBandung40600Indonesia

Molasses can serve as a natural adhesive for plywood and ***,several disadvantages remain,including lower dimensional stability and low bonding strength compared to other ***,modifications are needed to use molasses as an adhesive for *** research aims to improve bio-based molasses(MO)adhesive for plywood using citric acid(CA)*** addition,this research aims to analyze the effect of adding citric acid and to investigate the optimum hot-pressing temperature to produce the best quality *** the first stage,the molasses and citric acid were combined in a ratio of 100:0,75:25,50:50,25:75,0:100 w/w%.Then,the second stage focuses on analyzing the influences of pressing temperature based on an optimum first *** research demonstrated that the addition of CA altered the gelation time,solid content,viscosity,and pH of the molasses *** addition,the thermal properties of molasses adhesives were changed after mixing with citric *** phenomena indicate changes in characteristics,such as the curing of ***,the characteristics of plywood showed a steady improvement as the CA ratio increased but revealed a significant decline for the 25:75 MO-CA *** raising the pressing temperature from 180°C to 200°C,the quality of plywood was effectively *** plywood that was bonded using adhesives with a 50:50 MO-CA ratio exhibited superior mechanical properties and improved dimensional stability compared to the plywood bonded solely with ***,the optimal mechanical and physical properties resulted in plywood bonded with a 50:50 MO-CA ratio when subjected to a pressing temperature of 200°*** Thermal and FTIR measurements revealed that CA established ester bonds with both the MO and wood *** conclusion,the mechanical characteristics of plywood were improved,while maintaining its excellent dimensional stability.

关键词： Citric acid composite molasses pressing temperature plywood

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Selectivity of CO_(2)reduction reaction to CO on the graphitic edge active sites of Fe-single-atom and dual-atom catalysts:A combined DFT and microkinetic modeling

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Carbon Resources Conversion 2024年第1期7卷 21-31页

作者： Ahmad Nuruddin Adhitya Gandaryus Saputro Arifin Luthfi Maulana Febdian Rusydi Fiki Taufik Akbar Hadi Teguh Yudistira hermawan Kresno Dipojono Advanced Functional Materials Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungJl.Ganesha No.10Bandung 40132Indonesia Research Center for Nanosciences and Nanotechnology Institut Teknologi BandungJl.Ganesha No.10Bandung 40132Indonesia Research Center for Quantum Engineering Design Department of PhysicsFaculty of Science and TechnologyUniversitas AirlanggaSurabaya 60115Indonesia Theoretical High Energy Physics Research Division Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungJl.Ganesha No.10Bandung 40132Indonesia Mechanical Engineering Study Program Institut Teknologi Sumatera(ITERA)South LampungLampungIndonesia Department of Materials Science and Engineering University of CaliforniaBerkeleyBerkeleyCA 94720United States

We study the carbon dioxide reduction reaction(CO_(2)RR)activity and selectivity of Fe single-atom catalyst(Fe-SAC)and Fe dual-atom catalyst(Fe-DAC)active sites at the interior of graphene and the edges of graphitic nanopore by using a combination of DFT calculations and microkinetic *** trend of limiting potentials for CO_(2)RR to produce CO can be described by using either the adsorption energy of COOH,CO,or their ***_(2)RR process with reasonable reaction rates can be achieved only on the active site configurations with weak tendencies toward CO *** efficiency of CO_(2)RR on a catalyst depends on its ability to suppress the parasitic hydrogen evolution reaction(HER),which is directly related to the behavior of H adsorption on the catalyst’s active *** find that the edges of the graphitic nanopore can act as potential adsorption sites for an H atom,and in some cases,the edge site can bind the H atom much stronger than the main Fe *** linear scaling between CO and H adsorptions is broken if this condition is *** condition also allows some edge active site configurations to have their CO_(2)RR limiting potential lower than the HER process favoring CO production over H2 production.

关键词： CO_(2)RR FexNy active site Fe-SAC Fe-DAC Graphitic edges DFT Microkinetic

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Experiment and simulation to determine the optimum orientation of building-integrated photovoltaic on tropical building façades considering annual daylight performance and energy yield

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Energy and Built Environment 2024年第3期5卷 414-425页

作者： Rizki A.Mangkuto Dhian Nur Aziz T.Tresna Ikhwan M.hermawan Justin Pradipta Nurul Jamala Beta Paramita Atthaillah Building Physics Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungLabtek VIJl.Ganesha 10Bandung 40132Indonesia Engineering Physics Program Faculty of Industrial TechnologyInstitut Teknologi BandungLabtek VIJl.Ganesha 10Bandung 40132Indonesia Engineering Physics Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungLabtek VIJl.Ganesha 10Bandung 40132Indonesia Department of Architecture Faculty of EngineeringHasanuddin UniversityJl.Poros Malino Km.6Gowa 92171Indonesia Architecture Study Program Faculty of Technology and Vocational EducationUniversitas Pendidikan IndonesiaJl.Dr.Setiabudhi 229Bandung 40152Indonesia Architecture Program Faculty of EngineeringUniversitas MalikussalehJl.Cot Teungku NieAceh Utara 24355Indonesia

Building-Integrated Photovoltaic(BIPV)on vertical façades is a potential PV application in today’s *** performance of BIPV on façades is significantly influenced by the façade *** tropical cities,the optimum façade orientation,in terms of maximum energy yield and daylight performance,cannot be simply determined,due to relatively symmetrical sun path throughout the *** study therefore aims to determine the optimum orientation for BIPV on tropical building faç*** achieve the objective,experiment,modelling,and computational simulation are conducted to evaluate the BIPV energy yield and to predict the indoor daylight performance in a scale-model building with a 105Wp monocrystalline silicon PV,facing each cardinal orienta-tion in Bandung,*** South orientation yields practically zero ASE_(1000,250),providing the best annual daylight performance,and yielding the most desirable value in four out of five daylight *** greatest annual energy yield is at the North orientation,providing 179-186 kWh(95%prediction interval)per year,but with larger uncertainty compared to that at the South,due to direct sunlight *** on three different objective functions,the South orientation is considered optimum for placing the BIPV panel on the prototype façade in the location.

关键词： Building-integrated photovoltaic Orientation Daylight metric Energy yield Tropical building façade

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CONFLICT ANALYSIS OF CITARUM RIVER BASIN POLLUTION IN INDONESIA:A DRAMA-THEORETIC MODEL

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Journal of Systems Science and Systems Engineering 2009年第1期18卷 16-37页

作者： Pri hermawan Kyoichi KIJIMA Department of Value and Decision Science Tokyo Institute of Technology2-12-1-W9-39 O-okayama.Meguro-kuTokyo 152-8552Japan

The need to manage water resource within a holistic approach is crucial in Indonesia. Conflict situation which involves a variety of stakeholder needs an appropriate methodology to handle it. The purpose of this paper is to provide an integrated framework of a river basin pollution case in Indonesia. This research try to obtain an understanding of the complexity of inter-relationship between stakeholders of the Citarum River Basin and to give feasible recommendations based on a new developed integrated framework. We first describe the problem in a comprehensive way, then develop a framework to analyze the conflict. Next, we propose a general procedure to apply it, which we call Drama-theoretic Dilemma Analysis （DtDA）. After analyzing the conflicts that arise there between stakeholders using DtDA, we will show how to resolve the dilemmas by using holistic as well as intensive approaches. By applying DtDA in stakeholder analysis and resolving the dilemmas that arise in the interactions between them, we can identify barriers for collaboration.

关键词： Negotiation drama theory holistic view dilemma conflict pollution

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Morphology control of aluminum nitride(AlN)for a novel high-temperature hydrogen sensor

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1560-1567页

作者： Angga hermawan Yusuke Asakura Shu Yin Institute of Multidisciplinary Research for Advanced Material(IMRAM) Tohoku UniversitySendai 980-8577Japan

Hydrogen is a promising renewable energy source for fossil-free transportation and electrical energy ***,leaking hydrogen in high-temperature production processes can cause an explosion,which endangers production workers and surrounding *** detect leaks early,we used a sensor material based on a wide bandgap aluminum nitride(AlN)that can withstand a high-temperature *** unique AlN morphologies(rod-like,nest-like,and hexagonal plate-like)were synthesized by a direct nitridation method at 1400℃usingγ-AlOOH as a *** gas-sensing performance shows that a hexagonal plate-like morphology exhibited p-type sensing behavior and showed good repeatability as well as the highest response(S=58.7)toward a 750 ppm leak of H2 gas at high temperature(500°C)compared with the rod-like and nest-like ***,the hexagonal plate-like morphology showed fast response and recovery times of 40 and 82 s,*** surface facet of the hexagonal morphology of AlN might be energetically favorable for gas adsorption–desorption for enhanced hydrogen detection.

关键词： aluminum nitride controllable morphology direct nitridation γ-AlOOH hydrogen sensor

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Targets and molecular mechanisms of a citrus flavonoid, hesperidin, against luminal breast cancer cells: an integrative bioinformatics analysis

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Asian Pacific Journal of Tropical Biomedicine 2019年第12期9卷 531-538页

作者： Adam hermawan Herwandhani Putri Department of Pharmaceutical Chemistry Faculty of PharmacyUniversitas Gadjah MadaSekip Utara Ⅱ55281 YogyakartaIndonesia Cancer Chemoprevention Research Center Faculty of PharmacyUniversitas Gadjah MadaSekip Utara Ⅱ55281 YogyakartaIndonesia

Objective:To identify the potential target and mechanisms of hesperidin in MCF-7 estrogen receptor-positive breast cancer cells using bioinformatics ***:Gene expression profiles were accessed from public database *** Ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)pathway enrichment analysis was carried out with Database for Annotation,Visualization and Integrated *** protein-protein interaction network was analyzed by STRING-DB and visualized by *** factor regulatory networks were constructed from TRED,TRRUST,Reg Network and visualized by *** association analysis was conducted by Web ***:GO and KEGG pathway enrichment analysis revealed biological processes,cellular components and molecular functions that were related to cancer and estrogen signaling *** pathway enrichment analysis of the genes in transcription factor-differential expression genes regulatory network showed regulation of cancer,estrogen signaling pathways,epidermal growth factor receptor tyrosine kinase inhibitor resistance,and endocrine ***,drug association analysis revealed that hesperidin affected the expression of the same gene as ***:Hesperidin targets estrogen receptor signaling in estrogen receptor-positive breast cancer *** of this study could trace the molecular mechanism of hesperidin in estrogen receptor-positive breast cancer cells and integrative bioinformatics analysis could accelerate drug discovery and development.

关键词： Hesperidin Breast cancer Bioinformatics Estrogen receptor Signaling pathway

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A facile method for preparation of uniformly decorated-spherical SnO2 by CuO nanoparticles for highly responsive toluene detection at high temperature

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Journal of Materials Science & Technology 2020年第16期47卷 119-129页

作者： Angga hermawan Yusuke Asakura Miki Inada Shu Yin Institute of Multidisciplinary Research for Advanced Materials(IMRAM) Tohoku University2-1-1 KatahiraAoba-kuSendaiMiyagi980-857乙Japan Center of Advanced Instrumental Analysis Kyushu University6-1 Kasuga-Koen Kasuga-ShiFukuoka816-8580Japan

We reported a facile preparation of a uniform decoration of spherical n-type SnO2 by p-type CuO nanopa rticles as well as their utilization for enhanced performance on toluene gas *** nanoparticles and spherical SnO2 were synthesized by a facile non-hydrolytic solvothermal reaction,which could easily control their morphology.A uniform CuO nanoparticles decoration onto spherical SnO2 was achieved by a simple sonication and vigorous stirring at room tempe *** revealed orga nic solvents used in the oxide synthesis had a considerable influence on its surface charge that was beneficial for a uniformly electrostatic self-decoration between positively charged p-type CuO nanoparticles and negatively charged n-type spherical ***,CuO was partially reduced to Cu metal during high concentration of toluene exposure destroying p-n contact and developing new metal-semiconductor contact so-called ohmic junction,resulting in extraordinarily responsive and selective to toluene gas at 400℃as compared to a single p-CuO and *** was also found that the amount of particle decoration had an influence on sensor response and *** optimum amount of CuO nanoparticle decoration was0.1 mmol on 0.5 mmol *** re s ponse(S=Ra/Rg)and selectivity of CuO/S nO2 based material toward the exposure of 75 ppm toluene had reached to such high as 540 and 5,*** effect of p-n heterojunction and metal-semiconductor contact on the gas sensing mechanism of p-type CuO/n-type SnO2 was ***,by decorating with CuO nanoparticles,CuO/SnO2 morphology was well-maintained after gas sensing evaluation demonstrated its excellency for high temperature toluene gas sensor application.

关键词： CuO SnO2 p-n heterojunction Toluene gas sensor

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Mechanical and corrosion properties of partially degradable bone screws made of pure iron and stainless steel 316L by friction welding

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Science China Materials 2018年第4期61卷 593-606页

作者： Ahmad Kafrawi Nasution Mokhamad Fakhrul Ulum Mohammed Rafiq Abdul Kadir Hendra hermawan Department of Mechanical Engineering Faculty of Engineering Muhammadiyah University of Riau Faculty of Veterinary Medicine Bogor Agricultural University Faculty of Biosciences and Medical Engineering Universiti Teknologi Malaysia Department of Mining Metallurgical and Materials Engineering & CHU de Québec Research Center Laval University

This paper reports a series of in vitro, ex vivo and in vivo mechanical and corrosion studies of pin and screw prototype made of friction welded pure iron and 316 L type stainless steel aiming to evaluate the applicability of the partially removable bone screws. Results showed that the pin possesses bending, tensile and torsional strengths of1706±147, 666±7 and 0.34±0.03 MPa, respectively. The pin degraded at an average weight loss rate of 17.15×10-5 g cm-2 day-1 and released Fe ions at an average concentration of 2.38 ppm. Plastic deformation induced by torsion increased the corrosion rate of the pin from 0.0014 to 0.0137 mm *** maximum pull-out load of the screw prototypes was3800 N with a calculated failure strength by shear load equal to22.2 k N which is higher than the strength of the cortical *** analysis of the rat's blood cells during 60 days of the pin implantation indicated a normal response with low neutrophils/lymphocytes ratio of 0.3-0.5. Iron ion concentration in the rat's blood slightly increased from 55 to 61 ppm without affecting the tissue recovering and healing phase. Histological evaluation confirmed the presence of macrophage cells as a normal response to the released iron particles around the iron section of the pin.

关键词： biodegradable metal bone screw friction welding iron stainless steel

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Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

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Nano-Micro Letters 2021年第12期13卷 337-382页

作者： Angga hermawan Ni Luh Wulan Septiani Ardiansyah Taufik Brian Yuliarto Suyatman Shu Yin Faculty of Textile Science and Engineering Shinshu University3-15-1 TokidaUedaNagano 386-8567Japan Advanced Functional Materials Research Group Institut Teknologi BandungBandung 40132Indonesia Research Center for Nanosciences and Nanotechnology(RCNN) Institut Teknologi BandungBandung 40132Indonesia Institute of Multidisciplinary Research for Advanced Material(IMRAM) Tohoku University2-1-1 KatahiraAoba-kuSendaiMiyagi 980-8577Japan

Molybdenum-based materials have been intensively investigated for high-performance gas sensor ***,molybdenum oxides and dichalcogenides nanostructures have been widely examined due to their tunable structural and physicochemical properties that meet sensor *** materials have good durability,are naturally abundant,low cost,and have facile preparation,allowing scalable fabrication to fulfill the growing demand of susceptible sensor *** advances have been made in recent decades to design and fabricate various molybdenum oxides-and dichalcogenides-based sensing materials,though it is still challenging to achieve high ***,many experimental and theoretical investigations have been devoted to exploring suitable approaches which can significantly enhance their gas sensing *** review comprehensively examines recent advanced strategies to improve the nanostructured molybdenum-based material performance for detecting harmful pollutants,dangerous gases,or even exhaled breath *** summary and future challenges to advance their gas sensing performances will also be presented.

关键词： Molybdenum based MoO_3 MoS_(2) Gas sensing Advanced strategy

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MXene-Based Photocatalysts and Electrocatalysts for CO_(2) Conversion to Chemicals

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Transactions of Tianjin University 2022年第4期28卷 307-322页

作者： Tahta Amrillah Abdul Rohman Supandi Vinda Puspasari Angga hermawan Zhi Wei Seh Department of Nanotechnology Faculty of Advanced Technology and MultidisciplineUniversitas AirlanggaSurabaya 60115Indonesia Faculty of Textile Science and Technology Shinshu UniversityNagano 386-8567Japan Research Center for Metallurgy National Research and Innovation Agency(BRIN)South Tangerang CityBanten 15314Indonesia Research Center for Advanced Materials National Research and Innovation Agency(BRIN)South Tangerang CityBanten 15314Indonesia Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)Innovis 138634Singapore

The interest in CO_(2)conversion to value-added chemicals and fuels has increased in recent years as part of strategic eff orts to mitigate and use the excessive CO_(2)concentration in the *** attention has been given to developing two-dimensional catalytic materials with high-effi ciency CO_(2)adsorption capability and conversion *** several candidates are being investigated,MXenes stand out as one of the most promising catalysts and co-catalysts for CO_(2)reduction,given their excellent surface functionalities,unique layered structures,high surface areas,rich active sites,and high chemical *** review aims to highlight research progress and recent developments in the application of MXene-based catalysts for CO_(2)conversion to value-added chemicals,paying special attention to photoreduction and ***,the underlying photocatalytic and electrocatalytic CO_(2)conversion mechanisms are ***,we provide an outlook for future research in this fi eld,including photoelectrocatalysis and photothermal CO_(2)reduction.

关键词： MXenes CO_(2)conversion Photocatalyst Electrocatalyst Nanocomposite

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