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Effect of Nitrogen Doping on the Electrical Properties of 3C-SiC Thin Films for High-Temperature Sensors Applications

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Acta Metallurgica Sinica(English Letters) 2014年第1期27卷 168-174页

作者： H.K.E.Latha A.Udayakumar V.Siddeswara Prasad Department of Instrumentation Technology Siddaganga Institute of Technology Materials Science Division Council of Scientific and Industrial Research-National Aerospace Laboratories

3C-SiC is a promising structural material for piezoresistive sensors used in high-temperature applications. For sensor development, the preparation of sensor materials and study of its electrical properties, such as resistivity, barrier height of grain boundaries, and temperature coefficient of resistivity, are important in addition to structural properties and these have to be optimized. In the present work, 3C-SiC thin film with in situ doping of nitrogen is prepared through low- pressure chemical vapor deposition by using methyl trichloro silane, ammonia, and hydrogen as precursors. Electrical properties of deposited 3C-SiC thin films with varying nitrogen doping concentration through four probe technique are studied. Atomic force microscopy investigations are carried out to study the grain size on and average root-mean-squared roughness 3C-SiC thin films. A decrease in the degree of crystallinity is observed in nitrogen-doped 3C-SiC thin films. The sheet resistivity of nitrogen-doped 3C-SiC thin film is found to decrease with increase in temperature in the range from 303 to 823 K. The sheet resistivity, average temperature coefficient of resistance, and barrier height of the grain boundaries of film doped with 17 at.% of nitrogen are 0.14 cm, -1.0 x 10-n/K, and 0.01 eV, respectively. Comparing all the nitrogen-doped 3C-SiC thin films, the film doped with 17 at.% of nitrogen exhibits an improved structural and electrical properties and it can be used as sensing material for high-temperature applications.

关键词： Low-pressure chemical vapor deposition (LPCVD) 3C-SiC thin film Resistivity Barrier height of grain boundaries: Temperature coefficient of resistivitv (TCR)

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Instrumented and Vickers Indentation for the Characterization of Stiffness,Hardness and Toughness of Zirconia Toughened Al_2O_3 and SiC Armor

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Journal of Materials Science & Technology 2015年第8期31卷 773-783页

作者： Aleksandra Nastic Ali Merati Mariusz Bielawski Manon Bolduc Olaniyi Fakolujo Michel Nganbe Department of Mechanical Engineering University of Ottawa national research council Canada Defence R&D Canada(DRDC Valcartier)

Instrumented and Vickers indentation testing and microstructure analysis were used to investigate zirconia toughened alumina （ZTA） and silicon carbide （SIC）. Several equations were studied to relate the Vickers indentation hardness, Young＇s modulus and crack behavior to the fracture toughness. The frac- ture in SiC is unstable and occurs primarily by cleavage leading to a relatively low toughness of 3 MPa m1/2, which may be inappropriate for multi-hit capability. ZTA absorbs energy by plastic deformation, pore collapse, crack deviation and crack bridging and exhibits time dependent creep. With a relatively high toughness around 6.6 MPa m1/2, ZTA is promising for multi-hit capability. The higher accuracy of median equations in calculating the indentation fracture toughness and the relatively high c/a ratios above 2.5 suggest median type cracking for both SiC and ZTA. The Young＇s modulus of both ceramics was most accurately measured at lower indentation loads of about 0.5 kgf, while more accurate hardness and fracture toughness values were obtained at intermediate and at higher indentation loads beyond 5 kgf, respectively. A strong indentation size effect （ISE） was observed in both materials. The load independent hardness of SiC is 2563 HV, putting it far above the standard armor hardness requirement of 1500 HV that is barely met by ZTA.

关键词： Zirconia toughened alumina Silicon carbide Armor Vickers indentation fracture toughness Elastic modulus Vickers hardness

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GeDiPNet: Online resource of curated gene-disease associations for polypharmacological targets discovery

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Genes & Diseases 2023年第3期10卷 647-649页

作者： Indra Kundu Mridula Sharma Ram Shankar Barai Khushal Pokar Susan Idicula-Thomas Biomedical Informatics Centre Indian Council of Medical Research-National Institute for Research in Reproductive and Child HealthMumbai 400012India

There are numerous online databases dedicated to genes associated with human *** redundancy and lack of consistency of disease terms in these databases pose a significant impediment in high throughput data *** address this,we developed GeDiPNet by compiling data available on gene-disease associations from six popular open access sources namely DisGeNET,1 ClinGen.

关键词： databases online analysis.

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Epigenetic regulation of the inflammatory response in stroke

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Neural Regeneration research 2025年第11期20卷 3045-3062页

作者： Jingyi Liang Fei Yang Zixiao Li Qian Li School of Basic Medical Sciences Capital Medical UniversityBeijingChina Department of Neurobiology School of Basic Medical SciencesCapital Medical UniversityBeijingChina Laboratory for Clinical Medicine Beijing Key Laboratory of Neural Regeneration and RepairCapital Medical UniversityBeijingChina Department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina China national Clinical research Center for Neurological Diseases Beijing Tiantan HospitalCapital Medical UniversityBeijingChina national Center for Healthcare Quality Management in Neurological Diseases Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Chinese Institute for Brain research BeijingChina research Unit of Artificial Intelligence in Cerebrovascular Disease Chinese Academy of Medical SciencesBeijingChina Beijing Engineering research Center of Digital Healthcare for Neurological Diseases BeijingChina Department of Biochemistry and Molecular Biology School of Basic Medical SciencesCapital Medical UniversityBeijingChina Beijing Key Laboratory of Cancer Invasion and Metastasis research Capital Medical UniversityBeijingChina

Stroke is classified as ischemic or hemorrhagic,and there are few effective treatments for either *** mechanisms play a critical role in secondary brain injury following a stroke,which manifests as cytokine release,blood–brain barrier disruption,neuronal cell death,and ultimately behavioral *** the inflammatory response has been shown to mitigate this cascade of events in experimental stroke ***,in clinical trials of anti-inflammatory agents,longterm immunosuppression has not demonstrated significant clinical benefits for *** may be attributable to the dichotomous roles of inflammation in both tissue injury and repair,as well as the complex pathophysiologic inflammatory processes in *** acute harmful inflammatory responses or inducing a phenotypic shift from a pro-inflammatory to an anti-inflammatory state at specific time points after a stroke are alternative and promising therapeutic *** agents that can modulate inflammation requires a detailed understanding of the inflammatory processes of ***,epigenetic reprogramming plays a crucial role in modulating post-stroke inflammation and can potentially be exploited for stroke *** this review,we summarize current findings on the epigenetic regulation of the inflammatory response in stroke,focusing on key signaling pathways including nuclear factor-kappa B,Janus kinase/signal transducer and activator of transcription,and mitogen-activated protein kinase as well as inflammasome *** also discuss promising molecular targets for stroke *** evidence to date indicates that therapeutic targeting of the epigenetic regulation of inflammation can shift the balance from inflammation-induced tissue injury to repair following stroke,leading to improved post-stroke outcomes.

关键词： DNA methylation histone modification intracerebral hemorrhage ischemic stroke neuroinflammation neuroprotection non-coding RNA RNA methylation subarachnoid hemorrhage treatment

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Indium bump array fabrication on small CMOS circuit for flip-chip bonding

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Journal of Semiconductors 2011年第11期32卷 148-151页

作者：黄寓洋张宇翔殷志珍崔国新刘惠春边历峰杨辉张耀辉 Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Institute for Microstructural Sciences National Research Council

We demonstrate a novel method for indium bump fabrication on a small CMOS circuit chip that is to be flip-chip bonded with a GaAs/A1GaAs multiple quantum well spatial light modulator. A chip holder with a via hole is used to coat the photoresist for indium bump lift-off. The 1000 μm-wide photoresist edge bead around the circuit chip can be reduced to less than 500 μm, which ensures the integrity of the indium bump array. 64 - 64 indium arrays with 20 μm-high, 30 μm-diameter bumps are successfully formed on a 5 - 6.5 mm^2 CMOS chip.

关键词： flip-chip bonding indium bump array small-size

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Effect of Calcium Leaching on the Properties of Cement-based Composites

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Journal of Wuhan University of Technology(Materials Science) 2011年第5期26卷 990-997页

作者：林威廷鄭安 Institute of Nuclear Energy research Atomic Energy Council Dept.of Civil Engineering National Ilan University

Leaching is one of the major factors that alter the mechanical properties of cement-based *** study is aimed to investigate the effect of leaching on the properties of cement-based *** with two water/cementitious ratios and two mineral admixtures were *** electrical potential was applied to accelerate the leaching *** strength test,scanning electronic microscopy,thermogravimetric analysis and X-ray diffraction analysis were *** results demonstrated that the calcium leaching reduced compressive strengths of concrete specimens,and such effect was prominent on the specimens without mineral *** leaching resistance increased with a decrease in water/cementitious ratio and an increase in amount of mineral *** mineral admixtures would reduce the amount of calcium hydroxide and refine the pore structure through pozzolanic reactions.A fair relationship was found between the calcium leaching and the compressive strength.

关键词： leaching slag silica fume X-ray diffraction analysis thermo gravimetric analysis

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Polarized Light Microscopy and Spectroscopy of Individual Single-Walled Carbon Nanotubes

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Nano research 2011年第8期4卷 788-794页

作者： Jacques Lefebvre Paul Finnie Institute for Microstructural Sciences National Research Council Ottawa Canada K IA 0R6

Polarized light microscopy （PLM） is used to image individual single-walled carbon nanotubes （SWNTs） suspended in air across a slit opening. The imaging contrast relies on the strong optical anisotropy typical of SWNTs. We combine PLM with a tunable light source to enable hyperspectral excitation spectroscopy and nanotube chirality assignment. Comparison with fluorescence microscopy and spectroscopy confirms the assignment made with PLM. This represents a versatile new approach to imaging SWNTs and related structures.

关键词： Carbon nanotube microscopy luminescence absorption polarization homodyne

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Conditioning of a Calcaric Soil with Biosolid and Compost Under Laboratory Conditions: Exploration of Soil Property Evolution

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Pedosphere 2019年第2期29卷 266-272页

作者： José Antonio GALáN-PéREZ Aránzazu PE?A Andalusian Institute for Earth Sciences Spanish National Research Council-University of Granada (CSIC-UGR)

Dear Editor,Conditioning of soils of low organic carbon(OC)is essential to establish optimal fertility conditions for the growth and development of future crops.A usual practice is the substrates of various origins,among which cheap wastes from agricultural or urban residues with high organic matter(OM)content have been gaining popularity in the last *** increase in soil OM is considered a desirable trait in agriculture because of its benefits.

关键词： Exploration Conditioning Laboratory

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Application of machine learning techniques to simulate the evaporative fraction and its relationship with environmental variables in corn crops

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Ecological Processes 2022年第1期11卷 758-771页

作者： Terenzio Zenone Luca Vitale Daniela Famulari Vincenzo Magliulo national research council Institute for Agricultural and Forestry Systems in the MediterraneanP.Le Enrico Fermi 180055 PorticiItaly national research council CNR Institute for BioeconomyVia P.Gobetti10140129 BolognaItaly

Background:The evaporative fraction(EF)represents an important biophysical parameter reflecting the distribution of surface available *** this study,we investigated the daily and seasonal patterns of EF in a multi-year corn cultivation located in southern Italy and evaluated the performance of five machine learning(ML)classes of algorithms:the linear regression(LR),regression tree(RT),support vector machine(SVM),ensembles of tree(ETs)and Gaussian process regression(GPR)to predict the EF at daily time *** adopted methodology consisted of three main steps that include:(i)selection of the EF predictors;(ii)comparison of the different classes of ML;(iii)application,cross-validation of the selected ML algorithms and comparison with the observed ***:Our results indicate that SVM and GPR were the best classes of ML at predicting the EF,with a total of four different algorithms:cubic SVM,medium Gaussian SVM,the Matern 5/2 GPR,and the rational quadratic *** com-parison between observed and predicted EF in all four algorithms,during the training phase,were within the 95%confidence interval:the R^(2)value between observed and predicted EF was 0.76(RMSE 0.05)for the medium Gaussian SVM,0.99(RMSE 0.01)for the rational quadratic GPR,0.94(RMSE 0.02)for the Matern 5/2 GPR,and 0.83(RMSE 0.05)for the cubic SVM *** results were obtained during the testing *** results of the cross-validation analysis indicate that the R^(2)values obtained between all iterations for each of the four adopted ML algorithms were basically constant,confirming the ability of ML as a tool to predict ***:ML algorithms represent a valid alternative able to predict the EF especially when remote sensing data are not available,or the sky conditions are not *** application to different geographical areas,or crops,requires further development of the model based on different data sources of soils,climate,and cropping systems.

关键词： Energy flux Evapotranspiration Eddy covariance Artificial intelligence

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Interdisciplinary approaches based on imaging radar enable cutting-edge cultural heritage applications

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national Science Review 2021年第9期8卷 18-20页

作者： Fulong Chen Huadong Guo Deodato Tapete Nicola Masini Francesca Cigna Rosa Lasaponara Salvatore Piro Hui Lin Peifeng Ma Key Laboratory of Digital Earth Science Aerospace Information Research Institute Chinese Academy of Sciences Institute of Science of Cultural Heritage National Research Council Institute of Atmospheric Sciences and Climate National Research Council School of Geography and Environment Jiangxi Normal University Institute of Space and Earth Information Science The Chinese University of Hong Kong

Heritage assets reflecting memories of the past are increasingly sustained by societies as a necessary condition for the continuing evolution of people’s *** call for ‘strengthening efforts to protect and safeguard the world’s cultural and natural heritage’ in United Nations Sustainable Development Goal (SDG)11 [1] is a clear acknowledgement of the role of heritage in sustaining resilient societies and lifestyles.

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