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Effect of precursor thermal history on the formation of amorphous and crystalline calcium carbonate

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Particuology 2017年第4期15卷 29-34页

作者： Jitendra pal singh Mi-Jung Ji Cheol-Hwee Shim Sang Ok Kim Keun Hwa Chae Advanced Analysis Center Korea Institute of Science and Technology Seou102792 Republic of Korea Department of Biomedical Engineering Seonam University Namwon 55724 Republic of Korea

The role of the thermal history of the precursor was studied for amorphous and crystalline calcium carbon- ate phases synthesized from calcium nitrate. The X-ray diffraction patterns of these phases are influenced by their annealing temperature of 0, 300, 400, and 500 ℃. However, the effect of the precursor thermal history on the X-ray diffraction pattern of the resulting calcium carbonate phase is negligible. Transmis- sion electron microscopy indicates that materials annealed at 400 ℃ consist of amorphous aggregates, irrespective of the precursor thermal history. The crystallite size of crystalline calcium carbonate is influ- enced by the precursor thermal history, and ranges from 23 to 26 rim. Near-edge X-ray absorption fine structure measurements indicate that the annealing temperature plays an important role in determining the local electronic structure. The role of the thermal history of the precursor is also important for the resultinu electronic structure.

关键词： Amorphous material Particles Electron microscopy X-ray techniques NEXAFS Calcium carbonate

Bibliometric analysis of biochar research in 2021:a critical review for development,hotspots and trend directions

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Biochar 2023年第1期5卷 102-122页

作者： Ping Wu Bhupinder pal singh Hailong Wang Zhifen Jia Yujun Wang Wenfu Chen Center for Agricultural Resources Research Institute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuang 050021China School of Environmental and Rural Science University of New EnglandArmidaleNSW 2351Australia School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000GuangdongChina University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008JiangsuChina Biochar Engineering and Technology Research Center of Liaoning Province Rice Research InstituteAgronomy CollegeShenyang Agricultural UniversityShenyang 110866LiaoningChina Institute of Eco-Environmental and Soil Sciences Guangdong Academy of SciencesGuangzhou 510650China

As a bioproduct from the thermal decomposition of biomass,biochar has various applications in diversified *** this study,a bibliometric analysis was conducted to visualize the current research status and trends of biochar research.A total of 5535 documents were collected from the Web of Science Core Collection and subjected to visualization analysis for the biochar field’s development in 2021 with CiteSpace *** visual analysis results demonstrate that the number of publications expanded dramatically in 2021,and the growth trend would *** and USA were the most contributing countries in biochar research in terms of the number of *** on the keyword co-occurrence analyses,“Biochar for toxic metal immobilization”,“Biochar-based catalyst for biofuel production”,“Biochar for global climate change mitigation”,“Biochar for salinity and drought stress amelioration”,“Biochar amendment in composting”,and“Biochar as additives in anaerobic digestion”were the main research trends and hotspots in this field in *** indicates that the biochar research was *** the research hotspots,the employment of biochar as heterogeneous catalysts for biofuel production gained great attention in *** the contrary,bioremediation using functional bacteria immobilized on biochar and biochar-assisted advanced oxidation process were well-studied but with less frequency than other topics in ***,the future research was proposed for green and sustainable applications of *** review provides a comprehensive overview of the research frontiers,the evolution of research hotspots,and potential future research directions in the biochar field.

关键词： Bibliometric analysis Citespace Research hotspots Toxic metal immobilization Sustainable application

Transient performance estimation of charge plasma based negative capacitance junctionless tunnel FET

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Journal of Semiconductors 2016年第2期37卷 66-70页

作者： sangeeta singh p.n.kondekar pawan pal Department of Electronics and Communication Engineering PDPM-Indian Institute of Information TechnologyDesign and Manufacturing(IIITDM)Jabalpur JabalpurMPIndia

We investigate the transient behavior of an n-type double gate negative capacitance junctionless tun- nel field effect transistor （NC-JLTFET）. The structure is realized by using the work-function engineering of metal electrodes over a heavily doped n＋ silicon channel and a ferroelectric gate stack to get negative capacitance be- havior. The positive feedback in the electric dipoles of ferroelectric materials results in applied gate bias boosting. Various device transient parameters viz. transconductance, output resistance, output conductance, intrinsic gain, intrinsic gate delay, transconductance generation factor and unity gain frequency are analyzed using ac analysis of the device. To study the impact of the work-function variation of control and source gate on device performance, sensitivity analysis of the device has been carried out by varying these parameters. Simulation study reveals that it preserves inherent advantages of charge-plasma junctionless structure and exhibits improved transient behavior as well.

关键词： negative capacitance intrinsic gain transconductance generation factor intrinsic bias boosting

Acupuncture Anaesthesia in Ophthalmic Surgery

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中国针灸 1995年第S2期15卷 389-390页

作者： rajinder singh, Inderjit singh(rajinder Eye Hospital, 117 -A, Model Town Ext.,Ludhiana.Dr.Kotnis Acupuncture Hospital,Salem Tabri,Ludhiana.)

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ＡｃｕｐｕｎｃｔｕｒｅＡｎａｅｓｔｈｅｓｉａｉｎＯｐｈｔｈａｌｍｉｃＳｕｒｇｅｒｙ￥ＲａｊｉｎｄｅｒＳｉｎｇｈ，ＩｎｄｅｒｊｉｔＳｉｎｇｈ（ＲａｊｉｎｄｅｒＥｙｅＨｏｓｐｉｔａｌ，１１７－Ａ，ＭｏｄｅｌＴｏｗｎＥｘｔ．，Ｌｕｄｈｉａｎａ．Ｄｒ．Ｋｏｔ...

关键词： Acupuncture Surgery

Accuracy Improvement of ASTER Stereo Satellite Generated DEM Using Texture Filter

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Geo-Spatial Information Science 2010年第4期13卷 257-262页

作者： Mandla V.Ravibabu Kamal Jain Surendra pal singh Naga Jyothi Meeniga Center for GIS School of Geography and Environmental ScienceMonash UniversityClayton CampusVICAustralia Environmental Water Resource and Transportation Engineering DivisionSchool of Mechanical & Building ScienceVellore Institute of Technology(VIT)-University Vellore-632 014Tamil NaduIndia Geomatics Engineering Section Department of Civil EngineeringIndian Institute of Technology RoorkeeRoorkee-247667U.A.India Post Graduate Student(GST) Institute of Science and TechnologyJNTUHyderabadIndia

The grid DEM(digital elevation model) generation can be from any of a number of sources:for instance,analogue to digital conversion of contour maps followed by application of the TIN model,or direct elevation point modelling via digital photogrammetry applied to airborne images or satellite ***,apart from the deployment of point-clouds from LiDAR data acquisition,the generally favoured approach refers to applications of digital *** of the most important steps in such deployment is the stereo matching process for conjugation point(pixel) establishment:very difficult in modelling any homogenous areas like water cover or forest canopied areas due to the lack of distinct spatial *** a result,application of automated procedures is sure to generate erroneous elevation *** this paper,we present and apply a method for improving the quality of stereo DEMs generated via utilization of an entropy texture *** filter was applied for extraction of homogenous areas before stereo matching so that a statistical texture filter could then be applied for removing anomalous evaluation values prior to interpolation and accuracy assessment via deployment of a spatial correlation *** exemplification,we used a stereo pair of ASTER 1B images.

关键词： ASTER digital elevation model extraction stereo matching texture filter quality improvement

Nonunion of coronal shear fracture of femoral condyle

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Chinese Journal of Traumatology 2011年第3期14卷 143-146页

作者： Ajay pal singh Ish Kumar Dhammi Raju Vaishya Anil Kumar Jain Arun pal singh Prashant Modi Punjab Civil Medical Services Mukerian Punjab India Department of Orthopedics UCMS & GTB Hospital Delhi India Department of Orthopedics and Traumatology Indraprastha Apollo Hospital Delhi India S.P.N. Hospital Mukerian Punjab India

Isolated coronal fractures of femoral condyle are rare in adults and nonunion of Hoffa fracture is reported only a few times in the literature. We analyzed six cases of nonunion of Hoffa fractures over a period of three years. Three patients were treated conservatively and three patients had fixation failures. Delay of presentation was 2 months to one year. Treatment protocol consisted of open reduction, excision of pseudoarthrosis, bone grafting and internal fixation along with knee arthrolysis. Union wasachieved in all patients at mean 16 weeks. The treatment of nonunion of Hoffa fractures requires careful preoperative planning and meticulous surgical technique. The literature regarding the controversies in fracture management and surgical technique are reviewed.

关键词： Femoral fracture Fracture ftxation internal Retrospective studies

Isolation and in vivo hep-atoprotective activity of Melothria heterophylla(Lour.) *** chemically induced liver injuries in rats

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Asian Pacific Journal of Tropical Medicine 2011年第8期4卷 619-623页

作者： Arijit Mondal Tapan Kumar Maity Dilipkumar pal Santanu Sannigrahi Jagadish singh Department of Pharmaceutical Technology Jadavpur UniversityKolkata-700 032India School of Pharmaceutical Sciences IFTM UniversityMoradabad-244 001India NSHM College of Pharmaceutical Technology 124 B.L Saha RoadKolkata-700 053West BengalIndia

Objective:To investigate hepatoprotective activity of ethanol extract of Melothria heterophyila Lour Cogn.（EEMH） against CCl4-induced hepatic damage in ***:β-sitosterol was isolated by column chromatography and characterized *** different doses（200 and 400 mg/kg bw） of EEMH were administered orally in alternate *** hepatoprotective activity was studied in liver by measuring biochemical parameters such as serum aspartate amino transferase（AST）,alanine amino transferase（ALT）,alkaline phosphatase（ALP）,total protein and total *** peroxidation product and different antioxidant enzyme activities were assessed in liver ***:EEMH reduced all biochemical parameters and lipid peroxidation,as well as it increased the antioxidant enzyme activities in comparison with *** protective effect of the extract on CCl4 induced damage was confirmed by histopathological examination of the ***:This result strongly supports the protective effect of EEMH against acute liver injury,and may be attributed to its antioxidative activity.

关键词： Carbon tetrachloride Hepatoprotective activity Melothria helerophylla β-sitosterol Silymarin

Cu2O nanocrystals with various morphology:Synthesis,characterization and catalytic properties

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Chinese Chemical Letters 2017年第5期28卷 1125-1130页

作者： Mojtaba Bagherzadeh Narges-alsadat Mousavi Mojtaba Amini Sanjeev Gautam Jitendra pal singh Keun Hwa Chae Chemistry Department Sharif University of TechnologyTehranP.O.Box 11155-3615Iran Department of Chemistry Faculty of ScienceUniversity of MaraghehMaraghehIran Dr.SSBhatnagar University Institute of Chemical Engineering&Technology(SSB UICET)Panjab UniversityChandigarh 160-014India Advanced Analysis Center Korea Institute of Science and TechnologySeoul 136-791South Korea

Cu2O nanocubes,octahedra,spheres and truncated rhombic dodecahedral were prepared and their structural,morphological,and electronic properties were investigated by X-ray diffraction analysis.X-ray absorption near edge structure,scanning electron microscope and transmission electron microscope and X-ray absorption near edge ***2O nanocrystals were successfully employed to catalyze the 1,3-dipolar cycloaddition reaction for the synthesis of 1,4-disubstituted ***2O nanocubes and octahedral showed the superior catalytic performance in the cycloaddition *** results reveal that crystal-plane engineering of oxide catalysts is a useful strategy for developing efficient catalysts for organic reaction.

关键词： Nanocrystal Morphology Cu2O Azide-alkyne cycloaddition

Dielectric relaxation and conduction mechanism in Aurivillius ceramic Bi_(5)Ti_(3)FeO_(15)

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International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1063-1071页

作者： Rasmita Jena K.Chandrakanta P.pal Md.F.Abdullah S.D.Kaushik A.K.singh Department of Physics and Astronomy National Institute of Technology RourkelaRourkela-769008OdishaIndia UGC-DAE Consortium for Scientific Research Mumbai Centre BARCMumbai-400085India

For this study,we synthesized Aurivillius Bi_(5)Ti_(3)FeO_(15) ceramic using the generic solid-state reaction route and then performed roomtemperature X-ray diffraction to confirm that the compound had a single phase with no *** surface morphology of the prepared sample was observed to contain microstructural grains approximately 0.2–2μm in *** dielectric properties of the sample were determined as a function of frequency in a range of approximately 100 Hz to 1 MHz at various temperatures(303 K≤T≤773 K).Nyquist plots of the impedance data were found to exhibit a semi-circular arc in the high-temperature region,which is explained by the equivalent electrical circuit(R_(1)C_(1))(R_(2)QC_(2)),where R_(1) and R_(2) represent the resistances associated with the grains and grain boundaries,respectively,C_(1) and C_(2) are the respective capacitances,and Q is the constant phase element(CPE),which accounts for non-Debye type of *** results indicate that both the resistance and capacitance of the grain boundaries are more prominent than those of the *** alternating current(ac)conductivity data were analyzed based on the Jonscher universal power law,which indicated that the conduction process is dominated by the hopping *** calculated activation energies of the relaxation and conduction processes were very similar(0.32 to 0.53 eV),from which we conclude that the same type of charge carriers are involved in both processes.

关键词： Nyquist plot impedance spectroscopy activation energy ac conductivity hopping