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Study on methanol synthesis from coal-based syngas

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Journal of Coal Science & Engineering(China) 2009年第1期15卷 98-103页

作者： MA hong-fang YING Wei-yong fang Ding-ye State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

The intrinsic kinetic models of the Langmuir-Hinshelwood type were investigated in terms of the reaction rates of CO hydrogenation and CO_2 hydrogenation in theform of reactant fugacity. The parameters were estimated by the Universal Global Optimization using the Marquardt method. Residual error distribution and statistic tests show thatthe intrinsic kinetic models are reliable and acceptable. The mathematic model of a combined converter formed by gas-cooled and water-cooled reactor was developed and thegas-cooled reactor and the water-cooled reactor were characterized with one-dimensionalmathematic model. The distributions of temperature and concentration in the catalytic bedof the gas-cooled reactor and the water-cooled reactor in a combined converter with ayield of 1.2 Mt/a were simulated. The parallel cross linking pore model was used to describe the transfer process of multi-component diffusion system in the catalyst. The calculated value computed by the internal diffusion efficiency factor calculation model established for methanol synthesis catalyst fit the experimental value very well.

关键词： methanol coal-based syngas kinetics diffusion

ANALYSIS OF A SCREW DISLOCATION INSIDE A CIRCULAR INCLUSION WITH INTERFACIAL CRACKS IN PIEZOELECTRIC COMPOSITES

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Applied Mathematics and Mechanics(English Edition) 2005年第8期26卷 1047-1055页

作者： ZHENG Jian-long（郑健龙） fang Qi-hong（方棋洪） LIU You-wen（刘又文）不详 Department of Engineering Mechanics Hunan University Changsha 410082 P. R. China

The electroelastic interaction of a screw dislocation inside a circular inclusion with inteffacial cracks in piezoelectric composite materials under anti-plane shear and in-plane electric loads at infinity is investigated. The general solution to this problem was obtained by means of Riemann-Schwarz＇ s symmetry principle integrated with analysis of singularities of corresponding complex potentials. As a typical example, closed form expressions of the complex potentials and electroelastic field components in the matrix and inhomogeneity regions were derived explicitly when the interface contains a single crack. The image force acting on the screw dislocation was calculated by using the generalized Peach-Koehler formula. The influence of interfacial crack geometry and piezoelectric material property combinations upon the image force was discussed in detail. The results show that interfacial crack has a significant perturbation effect on the image force and the equilibrium position of the screw dislocation. The presence of the interfacial crack can change the direction of the image force when the length of the crack goes up to a critical value. The obtained explicit solutions can be used as Green＇s functions to study the problem on the interaction between interfacial cracks and arbitrary shape crack inside the inclusion. The present solutions can lead to previously known results as the special case.

关键词： screw dislocation interfacial crack complex variable method image force

Microstructure and mechanical property of NbTaTiV refractory high-entropy alloy with different Y_(2)O_(3) contents

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Rare Metals 2022年第10期41卷 3504-3514页

作者： Tao Liao Yuan-Kui Cao Wen-Min Guo Qi-hong fang Jia Li Bin Liu State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha410082China

In this study,NbTaTiV refractory high-entropy alloys(RHEAs) reinforced with dispersed oxides were successfully designed and fabricated by mechanical alloying and subsequent spark plasma sintering(SPS).The effects of Y_(2)O_(3) content on the microstructure and mechanical properties have been systematically *** results show that the oxide dispersion strengthening(ODS) RHEAs are mainly composed of body centered cubic(BCC) matrix and multiscale oxides,including submicron Ti-(N,O) particles,nano-sized Y-Ti-O particles and nano-sized Y_(2)O_(3) *** ODS-RHEAs have excellent mechanical properties due to the multisc ale *** the content of Y_(2)O_(3) increasing from 1 wt% to 3 wt% Y_(2)O_(3),the compressive yield strength of the ODSRHEAs significantly increases from 1528 to 1866 MPa,while the fracture strain slightly reduces from 22% to 16%.The enhancement of the mechanical property is mainly attributed to the increased amount of multisc ale oxide particles and the refined grain structure.

关键词： Refractory high-entropy alloy Oxide dispersion strengthening Spark plasma sintering(SPS) Mechanical property Strengthening mechanism

The electrochemiluminescent behavior of nickel phthalocyanine(NiTSPc)/H_2O_2 system on a heated ITO electrode

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Chinese Chemical Letters 2012年第6期23卷 711-714页

作者： hong fang Yang Ya Shan Zhang Bin Qiu Zhen Yu Lin Ministry of Education Key Laboratory of Analysis and Detection for Food Safety Fuzhou 350002 China Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety and Department of Chemistry Fuzhou University Fuzhou 350002 China Fujian Health College Fuzhou 350025 China

In this study, the electrochemiluminescent （ECL） behavior of Nickel（II） tetrasulfophthalocyanine （NiTSPc）/H2O2 on a heated indium tin oxide （ITO） electrode was investigated. The effect of pH value, electrochemical scan mode, concentration of NiTSPc and electrode surface temperature on the ECL intensities had been studied in detail. Based on the fact that the ECL of NiTSPc can be greatly enhanced by hydrogen peroxide at the ITO electrode, a new ECL biosensor for hydrogen peroxide has been developed. The possible mechanism for the ECL of NiTSPc has also been proposed.

关键词： Electrochemiluminescence Nickel tetrasulfophthalocyanine Hydrogen peroxide Heated electrode

Cloning and Expression of One Fibrinolytic Enzyme from Bacillus sp. zlw-2

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Agricultural Sciences in China 2009年第5期8卷 591-596页

作者： HAN Xin-mian GUO Run-fang YU hong-wei JIA Ying-min Department of Biology Engineering Agricultural University of Hebei Baoding 071000 P.R.China

The gene encoding fibrinolytic enzyme from Bacillus sp. zlw-2 was cloned and sequenced （accession no. EU734749）, which was 1146 bp, encoded 381 amino acids and had 99% homology with Nattokinase YF308 and NAT. The genes encoding pre-pro-fibrinolytic enzyme （including signal peptide, propeptide, and mature peptide） and fibrinolytic enzyme （including mature peptide） were cloned into pET28a vector respectively and then transformed into Escherichia coli BL21 （DE3）. The recombinant ofpre-pro-fibrinolytic enzyme showed enzyme activity of 183 U mL^-1, while no detectable enzyme activity could be found from the recombinant of the mature peptide.

关键词： fibrinolytic enzyme Nattokinase clone recombinant expression

Experiment on surface wake of internal waves generated by underwater vehicle in stratified fluids

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Journal of Hydrodynamics 2022年第2期34卷 277-285页

作者： Zhi-chong Yao Jun Zhang De-bao Gao Chuan-qi Liu fang-wen hong China Ship Scientific Research Center Wuxi214082China TaiHu Laboratory on Deep Sea Technology and Science Wuxi214082China National Key Laboratory on Ship Vibration and Noise Wuxi214082China

The surface flow field of internal waves generated by the underwater vehicle is very *** order to study the characteristics of the surface wake of internal waves,a surface particle image velocimetry(PIV)technique which can be used to measure the flow field in the order of mm/s is *** is made with respect to the key technique measuring the micro-velocity flow field of internal waves on the water surface in stratified *** wake generated by SUBOFF model is measured in stratified fluid tank,and the surface flow field of internal waves is successfully measured for the first *** experimental results are compared with predicted results by the classical Tuck’s internal wave *** results show the characteristics of the surface wake signature of internal waves and the variation of the angle between internal wave beams and the surface flow velocity of internal wave with the towing speed of the model are in good *** provides support for further research on wake signature remote sensing of internal waves in laboratory.

关键词： Stratified fluids surface wake signature internal waves experimental research

A labor-free index-guided semantic segmentation approach for urban vegetation mapping from high-resolution true color imagery

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International Journal of Digital Earth 2023年第1期16卷 1640-1660页

作者： Peng Zhang Cong Lin Shanchuan Guo Wei Zhang hong fang Peijun Du Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural ResourcesSchool of Geography and Ocean ScienceNanjing UniversityNanjingPeople’s Republic of China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application NanjingPeople’s Republic of China c Nanjing Research Institute of Surveying Mapping&Geotechnical InvestigationCo.LtdNanjingPeople’s Republic of China

Accurate and timely information on urban vegetation(UV)can be used as an important indicator to estimate the health of *** to the low cost of RGB cameras,true color imagery(TCI)has been widely used for high spatial resolution UV ***,the current index-based and classifier-based UV mapping approaches face problems of the poor ability to accurately distinguish UV and the high reliance on massive annotated samples,*** address this issue,an index-guided semantic segmentation(IGSS)framework is proposed in this ***,a novel cross-scale vegetation index(CSVI)is calculated by the combination of TCI and Sentinel-2 images,and the index value can be used to provide an initial UV ***,reliable UV and non-UV samples are automatically generated for training the semantic segmentation model,and then the refined UV map can be *** experimental results show that the proposed CSVI outperformed the existingfive RGB vegetation indices in highlighting UV cover and suppressing complex backgrounds,and the proposed IGSS workflow achieved satisfactory results with an OA of 87.72%∼88.16%and an F1 score of 87.73%∼88.37%,which is comparable with the fully-supervised method.

关键词： Urban vegetation mapping Sustainable Development Goals(SDGs) cross-scale vegetation index(CSVI) semantic segmentation high-resolution true color imagery(TCI)

RBF-Type Artificial Neural Network Model Applied in Alloy Design of Steels

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Journal of Iron and Steel Research International 2008年第2期15卷 87-90页

作者： YOU Wei LIU Ya-xiu BAI Bing-zhe fang hong-sheng Department of Mechanical and Electrical Engineering North China Institute of Science and Technology Beijing 101601 China Department of Electronics and Information Engineering North China Institute of Science and Technology Beijing 101601 China Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

RBF model,a new type of artificial neural network model was developed to design the content of carbon in low-alloy engineering *** errors of the ANN model are：MSE 0.052 1,MSRE 17.85%,and VOF 1.932 *** results obtaine... 详细信息

关键词： radial-basis-function, artificial neural network, carbon alloy design neurobalance

Cloning and Sequence Analysis of a Novel Cold-Adapted Lipase Gene from Strain lip35 (Pseudomonas sp.)

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Agricultural Sciences in China 2008年第10期7卷 1216-1221页

作者： WANG Cai-hong GUO Run-fang YU hong-wei JIA Ying-min Department of Biology Engineering Agricultural University of Hebei Baoding 071000 P.R.China

A combination method of the usual-PCR and reverse-PCR for the cloning of a novel lipase gene directly from the total genomic DNA of strain lip35 （Pseudomonas sp.） is described, whereby a lipase gene （lip） was cloned directly from genomic DNA. The sequence data have been deposited in the GenBank and EMBL data bank with the accession number EU414288. The nucleotide sequence showed a major open reading frame encoding a 59-kDa protein of 566 amino acid residues, which contained a lipase consensus sequence GXSXG. The lipase lip had 74 and 70% homologies with the lipases of an uncultured bacterium and P. fluorescens PfO-1, respectively, but it did not show any overall homology with lipases from other origins. The functional lipase was obtained when the lip gene was expressed in Pichia pastoris GS115.

关键词： PCR reverse-PCR lipase gene clone sequence analysis