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Journal of Semiconductors 2018年第9期39卷 15-21页

作者： k.Chakraborty S.Chakraborty N.B.manik Condensed Matter Physics Research Centre Department of Physics Jadavpur University

The influence of single walled carbon nanotube（SWCNT）on the series resistanceof Rose Bengal（RB）and Methyl Red（MR）dye-based organic diodes has been *** has been revealed from experimental results that SWCNT has a significant effect on *** values of Rs are measured from current–voltage（I–V）characteristics and also by utilizing the Cheung *** values from the Cheung method have been verified using H（I）–I plots for all dye-based *** extracted values using these two processes show a good consistency with each *** is observed that Rs is reduced significantly by incorporating SWCNT for both *** estimated amounts of reduction of Rs using SWCNT are 76.08%and 64.23%obtained from the I–V relationship whereas the value of Rs shows a reduction of 83.5%and 67.1%when measured by using the Cheung method for RB and MR dyes *** ideality factor and barrier height of the diodes have also been *** ideality factor has decreased with incorporation of SWCNT.A reduction in barrier height for the devices has also been observed in the presence of SWCNT.

关键词： SWCNT series resistance OPV barrier potential ideality factor

Sludge-based biochar adsorbent:pore tuning mechanisms,challenges,and role in carbon sequestration

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Biochar 2023年第1期5卷 1419-1441页

作者： Md manik Mian Wenya Ao Shubo Deng State key Joint Laboratory of Environment Simulation and Pollution Control(SkLESPC) Beijing Key Laboratory for Emerging Organic Contaminants ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China

Sludge biochar,a carbonized product of raw sludge,contains porous architectures that can act as epicenters for adsorbing external molecules through physical or chemical *** biochar also immobilizes innate micropollutants,which is advantageous over conventional sludge disposal *** date,numerous strategies have been discovered to improve sludge biochar morphology,but the influential factors,pore tuning mechanisms,and process feasibility remain *** knowledge gap limits our ability to design a robust sludge-based ***,we present state-of-the-art sludge biochar synthesis methods with insight into structural and chemical transformation *** and novel concepts for improving sludge biochar porous architecture are *** the first time,sludge biochar properties,adsorption performances,and techno-economic perspectives were compared with commercial activated carbon(AC)to reveal the precise challenges in sludge biochar *** importantly,sludge biochar role in carbon sequestration is detailed to demonstrate the environmental significance of this ***,the review concludes with an overview of prospects and an outlook for developing sludge biochar-based research.

关键词： Sludge-based adsorbent Micropores Feasible methods Challenges Carbon sequestration

Effect of COOH-functionalized SWCNT addition on the electrical and photovoltaic characteristics of Malachite Green dye based photovoltaic cells

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Journal of Semiconductors 2014年第12期35卷 32-37页

作者： S.Chakraborty N.B.manik Condensed Matter Physics Research Center Department of Physics Jadavpur University

We report the effect of COOH-functionalized single walled carbon nanotubes（COOH-SWCNT） on the electrical and photovoltaic characteristics of Malachite Green（MG） dye based photovoltaic cells. Two different types of photovoltaic cells were prepared, one with MG dye and another by incorporating COOH-SWCNT with this dye. Cells were characterized through different electrical and photovoltaic measurements including photocurrent measurements with pulsed radiation. From the dark current–voltage（I–V） characteristic results, we observed a certain transition voltage（Vth/ for both the cells beyond which the conduction mechanism of the cells change sharply. For the MG dye, Vthis 3.9 V whereas for COOH-SWCNT mixed with this dye, Vthdrops to 2.7 V. The device performance improves due to the incorporation of COOH-SWCNT. The open circuit voltage and short circuit current density change from 4.2 to 97 m V and from 108 to 965 A/cm2 respectively. Observations from photocurrent measurements show that the rate of growth and decay of the photocurrent are quite faster in the presence of COOH-SWCNT. This observation indicates a faster charge separation processes due to the incorporation of COOHSWCNT in the MG dye cells. The high aspect ratio of COOH-SWCNT allows efficient conduction pathways for the generated charge carriers.

关键词： MG dye COOH-SWCNT photovoltaic devices charge transport

Mineralogy and carbothermal reduction behaviour of vanadium-bearing titaniferous magnetite ore in Eastern India

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International Journal of Minerals,Metallurgy and Materials 2013年第10期20卷 917-924页

作者： Saikat Samanta manik Chandra Goswami Tapan kumar Baidya Siddhartha Mukherjee Rajib Dey Department Metallurgical and Material Engineering Jadavpur University National Metallurgical Laboratory Department of Geological Sciences Jadavpur University

Vanadium-beaxing titaniferous magnetite bands hosted by Precambrian gabbro-norite-anorthositic rocks or their metamorphic equivalents were discovered in some parts of Eastern Indian Shield, containing 48%-49% Fe （total）, 10%-25% TiO2, and 0.3%-2.20% V2O5 by mass. Mineralogical and petrological study, composition, and characterization of the vanadium-bearing titaniferous magnetite ore were carried out by scanning electron microscopy-energy dispersive X-ray （SEM-EDX）, wave length X-ray florescence （WDXRF）, inductively coupled plasma-atomic emission spectroscopy （ICP-AES）, X-ray diffraction （XRD）, etc. Chemical beneficiation for valuable metals, such as Fe, Ti, andV, was performed by reduction roasting. The direct and indirect reduction were investigated by mixing the lump ore with solid activated charcoal in a closed reactor and purging the reducing gas mixture in standard reducibility index apparatus at different temperatures and time intervals. The reduction roasting parameters were optimized. Finally, the reduced samples were crushed and upgraded by magnetic separation. The results show that, the maximum mass fractions of magnetic and nonmagnetic parts achieved axe 69.36% and 30.64%, respectively, which contain 10.6% TiO2 and 0.84% V205 in the magnetic part and 36.5% TiO2 and 0.22% V205 in the nonmagnetic part.

关键词： magnetite mineralogy carbothermal reduction beneficiation vanadium

Effect of temperature on the intensity and carrier lifetime of an AlGaAs based red light emitting diode

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Journal of Semiconductors 2013年第9期34卷 1-5页

作者： P.Dalapati N.B.manik A.N.Basu Condensed Matter Physics Research Center Department of PhysicsJadavpur University

The influence of temperature on the intensity of light emitted by as well as the carrier life time r of a standard A1GaAs based light emitting diode has been investigated in the temperature range from 345 to 136 k. The open-circuit voltage decay （OCVD） technique has been used for measured the carrier lifetime. Our experimental results reveal a 16% average increase in intensity and a 163.482-19.765 ns variation in carrier lifetime in the above temperature range. Further, theoretical and experimental analysis show that for negligible carrier density the intensity is inversely proportional to carrier lifetime for this sample.

关键词： LED low temperature intensity ideality factor carrier lifetime

Influence of temperature on tunneling-enhanced recombination in Si based p–i–n photodiodes

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Journal of Semiconductors 2014年第8期35卷 10-14页

作者： P.Dalapati N.B.manik A.N.Basu Condensed Matter Physics Research Center Department of Physics Jadavpur University

We investigate the dominant dark current transport mechanism in Si based p-i-n photodiodes, namely, BPW 21R, SFH 205FA and BPX 61 photodiodes in the temperature range of 350 to 139 k. The forward current- voltage characteristics of these photodiodes are explained via the tunneling enhanced recombination model, which gives a quantitative description of the electronic mechanism in the p-i-n junction photodiodes. The observed tem- perature dependence of the saturation current and the diode ideality factor of these devices agree well with theo- retical predictions; the analysis also indicates the importance of doping for enhancement of tunneling. The present study will be helpful in applying the devices at low temperature ambience.

关键词： photodiode low temperature ideality factor reverse saturation current tunneling energy

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

Quantitative trait loci analysis of glucosinolate,sugar,and organic acid concentrations in Eruca vesicaria ***

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Molecular Horticulture 2022年第1期2卷 287-302页

作者： Luke Bell Martin Chadwick manik Puranik Richard Tudor Lisa Methven Carol Wagstaff School of Agriculture Policy&DevelopmentCrop SciencesUniversity of ReadingReadingUK School of Chemistry Food&PharmacyFood&Nutritional SciencesUniversity of ReadingReadingUK Elsoms Seeds Ltd. SpaldingUK

Eruca vesicaria *** is a leafy vegetable of the Brassicaceae family known for its *** in grow-ing conditions,leaf age,agronomic practices,and variety choice lead to inconsistent quality,especially in content of isothiocyanates(ITCs)and their precursor glucosinolates(GSLs).We present the first linkage and Quantitative Trait Loci(QTL)map for Eruca,generated using a population of 139 F_(4) lines.A significant environmental effect on the abun-dance of primary and secondary metabolites was observed,with Uk-grown plants containing significantly higher concentrations of glucoraphanin,malic acid,and total ***-grown plants were characterized by higher concentrations of glucoerucin,indolic GSLs,and low monosaccharides.20 QTL were identified and associated with robust SNP *** genes putatively associated with the synthesis of the GSL 4-methoxyglucobrassicin(4MGB)were identified as candidate regulators underlying *** revealed that orthologs of MYB51,IGMT1 and IGMT4 present on LG1 are associated with 4MGB concentrations in *** research illustrates the utility of the map for identifying genes associated with nutritional composition in Eruca and its value as a genetic resource to assist breed-ing programs for this leafy vegetable crop.

关键词： Rocket Arugula Brassicaceae Glucoraphanin Malic acid 4-methoxyglucobrassicin

Node Coverage Algorithms in Wireless Sensor Networks Using Mobile Agents

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自动化学报 2006年第6期32卷 915-921页

作者： RAINA manik kUMAR Subhas PATRO Ranjeet Honeywell Technologies Bangalore 560076India

This paper proposes fault tolerant algorithms for routing mobile agents in a single channel wireless sensor network which cover every node in the network. These algorithms use local knowledge (assume no knowledge of global deployment or topology, etc). We propose the algorithms and show mathematical analysis to support our claims. The paper ends with simulation studies and discussion of results.

关键词： Wireless sensor networks mobile agents

Activated Carbon from Nipa Palm Fronds(Nypa fruticans)with H_(3)PO_(4) and kOH Activators as Fe Adsorbers

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Journal of Renewable Materials 2024年第2期12卷 203-214页

作者： Ninis Hadi Haryanti Eka Suarso Tetti N.manik Suryajaya Nurlita Sari Darminto Physics Study Program FMIPAUniversitas Lambung MangkuratBanjarbaru70714Indonesia Department of Physics Institut Teknologi Sepuluh NopemberSurabaya60111Indonesia

Nipa palm is one of the non-wood plants rich in lignocellulosic *** this study,palm fronds were converted into activated carbon,and their physical,chemical,and morphological properties were *** resulting activated carbon was then applied as an adsorbent of Fe metal in peat *** carbonization process was carried out for 60 min,followed by sintering at 400℃ for 5 h with a particle size of 200 *** and H_(3)PO_(4) were used in the chemical activation process for 24 ***-activated carbon contained 6.13%of moisture,4.55%of ash,17.02%of volatile matter,and 78.84%of fixed carbon,while its Fe reduction efficiency was 28.09%.The H_(3)PO_(4)-activated carbon contained 4.67%of moisture,2.84%of ash,16.41%of volatile matter,and 80.57%of bonded carbon,and the Fe reduction efficiency was 52.25%.kOH-activated carbon and H_(3)PO_(4)-activated carbon contained fixed carbon of 78.84%and 80.57%,respectively,while their average rates of efficiency of Fe reduction were 22.82%and 39.23%,***,the characteristics of activated nipa carbon met the Indonesian standards(SNI No.06-3730-1995).However,H_(3)PO_(4)-activated carbon was found to be better at adsorbing Fe metal from peat water.

关键词： Adsorption lignocellulosic reduction of Fe sintering volatile content