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Macroalgae-derived rare sugars: Applications and catalytic synthesis

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Carbon Resources Conversion 2021年第1期4卷 150-163页

作者： Asep Bayu Mega F.Warsito Masteria Y.putra Surachai Karnjanakom guoqing guan Research Center for Biotechnology Indonesian Institute of Sciences(LIPI)Jalan Raya Jakarta-Bogor KM.46CibinongBogorWest JavaIndonesia Department of Chemistry Faculty of ScienceRangsit UniversityPathumthani 12000Thailand Energy Conversion Engineering group Institute of Regional Innovation(IRI)Hirosaki University2-1-3MatsubaraAomori 030-0813Japan

Rare sugars have attracted much attention since they are highly beneficial for health as alternative sweeteners and full of potential economic value in *** limited availability of rare sugars in nature has promoted efforts on the conversion of sugars obtained from terrestrial plants into rare sugars,either via biological or chemo-catalytic ***,the processes are generally complicated and consist of multiple *** or seaweeds have been industrially used as a natural source of *** water-soluble polysaccharides contain monomeric sugars with unique chemical structures and are categorized as *** this review,the potency of macroalgae as a sustainable source of rare sugars and the recent progress on their catalytic conversion,either via biological or chemo-catalytical process,are summarized and ***,the depolymerization of macroalgae for the production of rare sugars is *** is expected to enrich our knowledge in the development of sustainable production of rare sugars from macroalgae.

关键词： Rare sugars Carbohydrates Macroalgae Seaweeds Phycocolloids

Using information from images for plantation monitoring: A review of solutions for smallholders

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Information Processing in Agriculture 2020年第1期7卷 109-119页

作者： Bayu Taruna Widjaja putra Peeyush Soni Bambang Marhaenanto Pujiyanto Soni Sisbudi Harsono Spyros Fountas Laboratory of Precision Agriculture and geoinformatics Faculty of Agricultural TechnologyJember UniversityJember 68121East JavaIndonesia Indonesian Coffee and Cocoa Research Institute(ICCRI) JemberEast JavaIndonesia Department of Agricultural and Food Engineering Indian Institute of Technology KharagpurKharagpur 721302India Agricultural University of Athens Iera Odos 7511845 AthensGreece

Technologically empowering farmers/smallholders notably accelerates the knowledge transfer to monitor plantations in developing ***,cost-effective technologies can rapidly increase the effectiveness of using expenses,labor,and *** is no limit to using digital cameras for non-destructive measurements,such as nutrient monitoring,pests and diseases,yield monitoring,and other information related to individual plant conditions in the plantation *** paper elaborates the fundamental concepts and best practices for future research on how to use image information from a single digital camera in decision support systems as a solution to monitoring plantations such as coffee,cocoa,and tree *** paper reviews the recent and potential research on plantation monitoring using a digital camera and other suitable integrated ***,we propose a protocol for use as a possible solution for smallholders to cope with the limitation in network/internet access *** this protocol,an integrated system for monitoring the farm activities of smallholders can be established.

关键词： Camera Sensors DSS protocol Biophysical monitoring Plantation monitoring

Effect of Y-Methacryloxypropyltrimethoxysilane (MPS) and Tetraethoxysilane (TEOS) Towards Preparation of Oil Absorbent Foams from Polyvinyl Alcohol (PVA) Reinforced with Microfibrillated Cellulose (MFC)

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Journal of Renewable Materials 2020年第7期8卷 739-757页

作者： Dzun Noraini Jimat Sharifah Shahira Syed putra Parveen Jamal Wan Mohd Fazli Wan Nawawi Mohammed Saedi Jami Department of Biotechnology Engineering Kulliyyah of EngineeringInternational Islamic University MalaysiaKuala Lumpur50728Malaysia

Increasing usage of foams in various industry sectors had causing serious disposal problems once it reaches the end of its ***,PVA-MFC foam was prepared by freeze-drying using polyvinyl alcohol(PVA)and microfibrillated cellulose(MFC)as a reinforced material from sugarcane bagasse(SCB).In this study,the PVA-MFC foam was chemically silylated with Y-methacryloxypropyltrimethoxysilane(MPS)and tetraethoxysilane(TEOS).The wetting ability and mechanical strength of the silylated_(2,20)PVA-MFC foam was greatly enhanced compared with unmodified_(2,20)PVA-MFC *** silane chemicals(MPS and TEOS)had been confirmed grafted on_(2,20)PVA-MFC foam due to the presence of Si-C and Si-O-C stretching vibration as showed in Fourier Transform Infrared(FTIR)spectra and cloud-like coating of porous pore was observed in scanning electron microscopy(SEM)*** silylated_(2,20)PVA-MFC foam(MPS and TEOS)exhibited a series of desirable properties such as lower swelling ratio and high absorption capacity of solvents and oils but had low thermal stability in thermogravimetric(TgA)*** characterization of_(2,20)PVA-MFC foam using TEOS was further investigated.A significant difference in morphology was clearly observed between the unmodified and silylated_(2,20)PVA-MFC-TEOS foam through field emission scanning electron microscopy(FESEM)*** X-ray photoelectron(XPS)analysis of silylated_(2,20)PVA-MFC-TEOS foam confirmed the presence of C,O and trace amount of Si *** synthesized_(2,20)PVA-MFC foam could be a promising material for broad range of polymer foam applications.

关键词： Polyvinyl alcohol foam microfibrillated cellulose sugarcane bagasse Y-methacryloxypropyltrimethoxysilane tetraethoxysilane and oil absorbent

Multifunctional SiC@SiO_(2) Nanofiber Aerogel with Ultrabroadband Electromagnetic Wave Absorption

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Nano-Micro Letters 2022年第9期14卷 237-256页

作者： Limeng Song Fan Zhang Yongqiang Chen Li guan Yanqiu Zhu Mao Chen Hailong Wang Budi Riza putra Rui Zhang Bingbing Fan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanPeople’s Republic of China School of Materials Science and Engineering Zhengzhou University of AeronauticsZhengzhou 450015HenanPeople’s Republic of China College of Engineering Mathematics and Physical SciencesUniversity of ExeterExeter EX44SBUK Research Center for Metallurgy National Research and Innovation AgencySouth Tangerang 15315BantenIndonesia State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100ShandongPeople’s Republic of China School of Materials Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023HenanPeople’s Republic of China

Traditional ceramic materials are generally brittle and not flexible with high production costs,which seriously hinders their practical *** nanofiber ceramic aerogels are highly desirable for applications in extreme environments,however,the integration of multiple functions in their preparation is extremely *** tackle these challenges,we fabricated a multifunctional SiC@SiO_(2) nanofiber aerogel(SiC@SiO_(2) NFA)with a threedimensional(3D)porous cross-linked structure through a simple chemical vapor deposition method and subsequent heat-treatment *** as-prepared SiC@SiO_(2) NFA exhibits an ultralow density(~11 mg cm^(-3)),ultra-elastic,fatigue-resistant and refractory performance,high temperature thermal stability,thermal insulation properties,and significant strain-dependent piezoresistive sensing ***,the SiC@SiO_(2) NFA shows a superior electromagnetic wave absorption performance with a minimum refection loss(RL_(min))value of-50.36 d B and a maximum effective absorption bandwidth(EAB_(max))of 8.6 *** successful preparation of this multifunctional aerogel material provides a promising prospect for the design and fabrication of the cutting-edge ceramic materials.

关键词： Multifunctional SiC@SiO_(2)nanofiber aerogel Chemical vapor deposition Electromagnetic wave absorption Ceramic materials

The effect of curcumin as an antioxidant on cochlea fibroblasts in ototoxic rat models

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Journal of Chinese Pharmaceutical Sciences 2018年第12期27卷 847-854页

作者： Tengku Siti Hajar Haryuna Agustinus Hamonangan Winston Purba Farhat Farhat Soehartono Taat putra Department of Otorhinolaryngology Faculty of MedicineUniversitas Sumatera Utara Pathobiology Division Department of Anatomic Pathology Faculty of Medicine Universitas Airlangga

Aminoglycosides(e.g. gentamicin) are ototoxic drugs and widely prescribed due to their effective antimicrobial actions and affordable prices. This study focused on determining protective effect of curcumin against the damage caused by aminoglycosides. We aimed to demonstrate the potential of curcumin as an antioxidant to increase the expressions of superoxide dismutase(SOD) in fibroblasts of cochlea lateral wall in ototoxic rat models. The experiment was conducted with randomized post test-only control group design by using 32 male Rattusnorvegicus adults which received a combination of gentamicin and curcumin with different durations and doses. Then, the rats underwent terminations and immunohistochemical assay to determine the expression of SOD. The rats receiving gentamicin injection showed significantly decreased expression of SOD(Pgentamicin injection showed significantly increased expression of SOD(Pgainst oxidative stress due to ototoxicity evidenced by the expression of SOD.

关键词： Curcumin Antioxidant gentamicin Superoxide dismutase Preventive Rat Experimental

Local geoid modeling in the central part of Java, Indonesia, using terrestrial-based gravity observations

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geodesy and geodynamics 2023年第3期14卷 231-243页

作者： Rahayu Lestari Brian Bramanto Kosasih Prijatna Arisauna M.Pahlevi Widy putra Raa Ina Sidrotul Muntaha Febriananda Ladivanov Departement of geodesy and geomatics Engineering Faculty of Earth Sciences and TechnologyInstitut Teknologi BandungIndonesia geodesy Research group Faculty of Earth Sciences and TechnologyInstitut Teknologi BandungIndonesia geodetic and geodynamic Control Network Center Geospatial Information Agency of Indonesia(BIG)Indonesia

The global Navigation Satellite System(gNSS)positioning method has been significantly developed in geodetic ***,the height obtained through gNSS observations is given in a geodetic height system that needs to be converted to orthometric height for engineering *** on geoid height,which can be calculated using the global geopotential mode,is required to convert such gNSS observations into orthometric ***,its accuracy is still insufficient for most engineering ***,a reliable geoid model is essential,especially in areas growing fast,e.g.,the central part of Java,*** this study,we modeled the local geoid model in the central part of Java,Indonesia,using terrestrial-based gravity *** Stokes'formula with the second Helmert's condensation method under the Remove-Compute-Restore approach was implemented to model the *** comparison between our best-performing geoid model and gNSS/leveling observations showed that the standard deviation of the geoid height differences was estimated to be 4.4 *** geoid result outperformed the commonly adopted global model of EgM2008 with the estimated standard deviation of geoid height differences of 10.7 cm.

关键词： gravimetric geoid Stokes integration Second Helmert's condensation method gNSS/Leveling

Controllable Macroscopic Architecture of Subtractive Manufactured Porous Iron for Cancellous Bone Analogue:Computational to Experimental Validation

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Journal of Bionic Engineering 2020年第2期17卷 357-369页

作者： Muhammad Azfar Noordin Rabiatul Adibah Abdul Rahim Ahmad Nabeel Hakimi Roslan Iza Azura Ali Ardiyansyah Syahrom Amir putra Md Saad Applied Mechanics and Design School of Mechanical EngineeringFaculty of EngineeringUniversiti Teknologi Malaysia81310 UTM Johor BahruMalaysia Medical Devices and Technology Centre(MEDiTEC) Institute of Human Centred and Engineering(iHumEn)Universiti Teknologi Malaysia81310 UTM Johor BahruMalaysia School of Biomedical&Health Science Faculty of EngineeringUniversiti Teknologi Malaysia81310 UTM Johor BahruMalaysia

Higher strength and lower degradation rate of Fe compared to magnesium and zinc have made it the most reliable for orthopaedic ***,this paper studies the morphological and mechanical characteristics of porous Fe fabricated using subtractive manufacturing for load bearing bone *** types of porous Fe(19%,39%and 59%)were prepared and then modelled into a 3D model for finite element *** mechanical properties evaluated through finite element analysis were then validated by the experimental *** fluid dynamics was done in this study to evaluate the permeability and wall shear stress of the porous *** between morphological indices,mechanical properties,shear stress and permeability were then *** mechanical behaviour of porous Fe investigated through finite element analysis was in good agreement with the experimental *** mechanical properties of porous Fe specimen particularly sample C(modulus:5.63 gPa and yield strength:145.7 MPa)was tailored to the cancellous bone(modulus:0.5 gPa-18 gPa and yield strength:101 MPa-169.6 MPa).As the porosity increased,the performance of porous Fe regarding mechanical properties and morphological properties were enhanced.

关键词： mechanical characterization morphology finite element analysis porous iron shear stress permeability

Enhanced electromagnetic wave absorption via optical fiber-like PMMA@Ti_(3)C_(2)T_(x)@SiO_(2) composites with improved impedance matching

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Nano Research 2024年第3期17卷 1676-1686页

作者： Huanhuan Niu Xuewen Jiang Wei Li Zhiyu Min Budi Riza putra Wulan Tri Wahyuni Hailong Wang Rui Zhang Bingbing Fan School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Materials Science and Engineering Tongji UniversityShanghai 201804China Department of Materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany School of Material Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China Research Center for Metallurgy National Research and Innovation Agency(BRIN)PUSPIPTEK Gd.470South TangerangBanten 15315Indonesia Analytical Chemistry Division Department of ChemistryFaculty of Mathematics and Natural SciencesIPB UniversityWest Java 16680Indonesia

Ti_(3)C_(2)T_(x) nanosheets have attracted significant attention for their potential in electromagnetic wave absorption(EWA).However,their inherent self-stacking and exorbitant electrical conductivity inevitably lead to serious impedance mismatch,restricting their EWA ***,the optimization of impedance matching becomes *** this work,we developed polymethyl methacrylate(PMMA)@Ti_(3)C_(2)T_(x)@SiO_(2) composites with a sandwich-like core–shell structure by coating SiO_(2) on PMMA@Ti_(3)C_(2)T_(x).The results demonstrate that the superiority of the SiO_(2) layer in combination with PMMA@Ti_(3)C_(2)T_(x),outperforming other relative graded distribution structures and meeting the requirements of EWA *** resulting PMMA@Ti_(3)C_(2)T_(x)@SiO_(2) composites achieved a minimum reflection loss of-58.08 dB with a thickness of 1.9 mm,and an effective absorption bandwidth of 2.88 *** analysis revealed that the structural design of SiO_(2) layer not only optimized impedance matching,but also synergistically enhanced multiple loss mechanisms such as interfacial polarization and dipolar ***,this work provides valuable insights for the future preparation of high-performance electromagnetic wave absorbing Ti_(3)C_(2)T_(x)-based composites.

关键词： polymethyl methacrylate(PMMA)@Ti_(3)C_(2)T_(x)@SiO_(2)composites impedance match SiO_(2)layer optical fiber-like structure interfacial polarization and dipolar polarization

Thermal performance of cooling strategies for asphalt pavement: A state-of-the-art review

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Journal of Traffic and Transportation Engineering(English Edition) 2021年第3期8卷 356-373页

作者： Salam Ridha Oleiwi Aletba Norhidayah Abdul Hassan Ramadhansyah putra Jaya Eeydzah Aminudin Mohd Zul Hanif Mahmud Azman Mohamed Ahmed Abdulameer Hussein School of Civil Engineering Faculty of EngineeringUniversiti Teknologi MalaysiaJohor Bahru 81300JohorMalaysia Department of Civil Engineering College of EngineeringUniversiti Malaysia PahangGambang 26300PahangMalaysia

Asphalt pavements absorb and store more heat than natural surfaces. Thus, high temperatures are emitted from conventional asphalt pavements, subsequently releasing heat into the atmosphere and contributing to the urban heat island(UHI) phenomenon. Several cool pavement strategies, including the provision of additives and materials, surface coating and layer design, have been introduced to reduce the impact of UHI. This article provides a detailed review of the thermal properties of these mitigation measures in the context of cool asphalt pavements. The literature can be divided into three segments. The first segment discusses the impact of pavements on UHI and heat transfer mechanisms in pavements. The second segment focuses on various thermo physical properties that play an important role in mitigation measures;these properties include albedo(a), emissivity(e),solar reflective index, thermal conductivity(k), specific heat capacity(Cp) and thermal diffusivity. The third segment discusses cool asphalt pavement strategies which specifically cover the ability of the pavement to absorb and reflect solar energy on the basis of the materials and treatments used. The literature reveals that cooling strategies that deal with the pavement surface are important due to its direct incident solar effect, which depends on surface colour, material, shape and roughness. By using high-albedo and high-emissivity surfaces, the pavement can store less heat and lower the surface temperature. These results can also be achieved by designing the materials and pavement layers with low thermal conductivity and high specific heat capacity to reduce thermal diffusivity and pavement temperature and thus combat the heat radiated by the asphalt pavement.

关键词： Road engineering Urban heat island Cool pavements Asphalt pavement Thermal properties