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Fabrication and characterization of nanoporous Ag-Pt alloy

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Rare Metals 2021年第5期40卷 1203-1207页

作者： tao Yin Fan-yun Meng Min Zhang Ying-Wei Yan Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Engineering Research Centre of Natural Medicine Ministry of EducationFaculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China School of Mechanical Electronic and Control EngineeringMaterials Science and Engineering Research CenterBeijing Jiaotong UniversityBeijing 100044China

Nanoporous Ag-Pt bi-metallic alloy was fabricated by free dealloying of amorphous Ag-based precursor with the nominal composition of *** noble Ag and Pt were left after the less noble Cu and Si dissolved in a certain acid ***-continuous nanoporous microstructure was formed with asymmetric ligaments and pores with typically 30-200 nm in *** trace addition of Pt has refined the grains of the ligaments to the average size of less than 20 nm in the substrate and induced the formation of rods with *** morphologies of the rods were observed by scanning electron microscopy(SEM)and transmission electron microscopy(TEM)both in the form of clusters and as scattered individuals with characteristic length of several micrometers and diameter of tens of *** grains sizes in the rods were finer than those in the *** good mechanical integrity might be due to the combination of continuous ligaments and clusters of rods.

关键词： Nanoporous Ag-Pt alloy Amorphous precursor Dealloying Nanograins

Robust Approximation-Based Event-Triggered MPC for Constrained Sampled-Data Systems

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Journal of Systems Science & Complexity 2021年第6期34卷 2109-2124页

作者： WANG tao KANG Yu LI Pengfei ZHAO yun-Bo YU Peilong Department of Automation University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230027China Institute of Advanced Technology University of Science and Technology of ChinaHefei 230027China College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China

In this paper,an approximation-based event-triggered model predictive control(AETMPC)strategy is proposed to implement event-triggered model predictive control for continuous-time constrained nonlinear systems under the digital *** the AETMPC strategy,both of the optimal control problem(OCP)and the triggering conditions are defined in a discrete-time manner based on approximate discrete-time models,while the plant under control is continuous *** doing so,sensing load is alleviated because the triggering condition does not need to be checked continuously,and the computation of the OCP is simpler since which is calculated in the discrete-time ***,robust constraints are satisfied in a continuous-time sense by taking inter-sampling behavior into consideration,and a novel constraint tightening approach is presented ***,the feasibility of the AETMPC strategy is analyzed and the associated stability of the overall system is ***,this strategy is validated by a numerical example.

关键词： Approximations event-triggered control model predictive control sampled-data systems

Photo-switchable Cu^(+)sites in metal-organic frameworks for adsorptive desulfurization

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Nano Research 2023年第2期16卷 3333-3338页

作者： Yu-Yang gu guoliang Liu Shi-Chao Qi Chen gu tao Yang Xiao-Qin Liu Lin-Bing Sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Material(SICAM)College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China

Photo-switchable metal-organic frameworks(PMOFs)as energy-saving adsorbents for tailorable guest capture show admirable potentials for various applications like adsorptive ***,the regulation behavior of most reported PMOFs is based on weak physical interaction,and it is highly desired to introduce specific active sites to satisfy the demand of higher adsorption capacity and ***,for the first time,we prepared the PMOFs,azobenzene-functionalized HKUST-1(HK-Azo),simultaneously decorated with Cu_(2)O active sites that possess strong interaction with guest *** toπ-complexation interaction of Cu^(+)with aromatic sulfur compounds,the obtained HK-Azo shows obviously higher adsorption capacity on benzothiophene compared with *** ultraviolet(UV)and visible irradiation,azobenzene moieties in the PMOFs can transform their configuration freely and *** trans/cis isomerization of azobenzene causes exposure/shelter of Cu_(2)O active sites,leading to controllable benzothiophene *** HK-Azo exhibits the change of benzothiophene uptake up to 29.7%upon trans and cis isomerization,which is obviously higher than HKUST-1 with negligible *** work may inspire the development of new adsorption process regulated by light for adsorptive desulfurization that is impossible to realize by conventional PMOFs.

关键词： Cu+active sites metal-organic frameworks photo-switchable property azobenzene adsorptive desulfurization

Applications of membrane distillation technology in energy transformation process-basis and prospect

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Chinese Science Bulletin 2009年第16期54卷 2766-2780页

作者： WANG ZanShe gu ZhaoLin FENG ShiYu LI yun School of Power and Engineering Xi'an Jiaotong University Xi'an 710049 China School of Human Settlement and Civil Engineering Xi'an Jiaotong University Xi'an 710049 China

Membrane distillation technology is a new type of efficient separation technology that combines traditional distillation technology and membrane separation technology. In the study, applications of membrane distillation technology in thermal engineering and refrigerating engineering with typical energy transformation process were presented. Desorption and regeneration process of saline solution by vacuum membrane distillation was proposed on the basis of the concentration and separation properties of membrane distillation. Membrane distillation technology could be used in lithium bromide absorption refrigeration system, energy storage system, and the regeneration process of liquid desiccant solution in temperature-humidity independent control air-conditioning system. The aim of the applications was to use the low-grade energy such as waste heat, solar energy and geothermal energy adequately and to improve the available temperature difference of heat source. According to latent heat transfer and thermal conduction across the membrane in direct contact membrane distillation process, a novel membrane heat exchanger with both heat transfer and mass transfer processes was proposed. The heat exchanger could be used as the solution heat exchanger of lithium bromide absorption refrigeration system and as the special heat exchanger that recovered heat and pure water simultaneously. Some feasible process flows about the applications of membrane distillation technology to energy transformation process were listed and analyzed. Finally, future research emphases were indicated.

关键词：蒸馏技术转换过程应用基础能源膜

Clumpy metal concentrations in elliptical galaxies NGC 4374 and NGC 4636

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Research in Astronomy and Astrophysics 2010年第3期10卷 220-226页

作者： Hai-guang Xu Jun-Hua gu Li-Yi gu Zhong-Li Zhang Yu Wang tao An Department of Physics Shanghai Jiao Tong University Shanghai 200240 China Max-Planck Institut fur Astrophysik D-85740 Garching Germany Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China

We present a high spatial resolution study of metal distributions in the nearby, gas-rich elliptical galaxies NGC 4374 and NGC 4636 with the Chandra ACIS archive data. We define the hardness ratio HRFeL as the ratio of the emission in 0.65- 1.4 keV to that in 0.3-0.6 keV and 1.4-3.5 keV （after the magnesium and silicon lines are excluded）, and HRcont as the ratio of the emission in 1.4-3.5keV to that in 0.3- 0.6 keV, so that the HRFeL and HRcont maps can be used to trace the iron abundance and gas temperature distributions, respectively. By applying the a Trous wavelet algorithm to the obtained emission hardness ratio maps, we reveal that the HRFeL distributions are highly irregular, exhibiting strong spatial variations on 0.1-1 Re scales, which do not follow the HRcont distributions. Since the effect of temperature variation is small, we conclude that most of the high-HRFeL regions are very likely to possess higher abundances than the ambient gas. We also find that these high-HRFeL substructures are not associated with either the LMXB or globular cluster populations, thus their origins should be related to AGN activity or mergers.

关键词： galaxies: elliptical and lenticular cD -- galaxies: individual (NGC 4374 NGC 4636) -- galaxies: ISM -- ISM: abundances -- X-rays: galaxies

Synthesis,Crystal Structure and Cytotoxic Activity of a New N-Vinyl-1H-dibenzo[a,c]carbazole Derivative of the Dehydroabietic Acid

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Chinese Journal of Structural Chemistry 2013年第12期32卷 1904-1910页

作者： gu Wen HAO yun CHEN Hong-Tu WANG Shi-Fa Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals College of Chemical EngineeringNanjing Forestry University

The title compound （C29H33NO2, 3） was synthesized and structurally characterized by elemental analysis, IR, MS, 1H- and 13C-NMR and single-crystal X-ray diffraction. The crystal is of monoclinic system, space group P21 with a = 14.428（3）, b = 7.3440（15）, c = 22.768（5） A, β = 95.17（3）°, V = 2402.7（8） A3, Z = 4, Mr = 427.56, Dc = 1.182 g/cm3, F （000） = 920, 2（MoKa） = 0.71073 A,μ = 0.073 mm-1, the final R= 0.0670 and wR= 0.1002 for 2437 reflections with I〉 2σ（I） Two crystallographically independent molecules with different conformations co-exist in the structure. The crystal structure is stabilized by intermolecular C-H…π interactions which make the molecules stack along the b axis. In addition, the preliminary cytotoxic assay showed that the title compound exhibited moderate inhibitory activity against KB and SW1116 cells.

关键词： dehydroabietic acid crystal structure 1H-dibenzo[a,c]carbazole cytotoxic activity

Eco-geological environment quality assessment based on multi-source data of the mining city in red soil hilly region, China

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Journal of Mountain Science 2022年第1期19卷 253-275页

作者： ZHAO Fei-fei HE Man-chao WANG yun-tao tao Zhi-gang LI Chun State Key Laboratory for GeoMechanics and Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 10083China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 10083China Beijing Institute of Geology Beijing 100010China Key Laboratory of Geotechnical and Underground Engineering Tongji UniversityMinistry of EducationShanghai 200082China Beijing Baodiyilian Geological Exploration Engineering Technology Co.LTD Beijing 100010China

High-intensity and large-scale resource development seriously threatens the fragile ecological environment in the red soil hilly region in southern China. This paper analyzes the eco-geological environmental problems and factors affecting Ganzhou, a mining city in the red soil hilly region,based on field survey and literature. The ecogeological environment quality(EGEQ) assessment system, which covered 11 indicators in physical geography, mining development, geological hazards,as well as water and soil pollution, was established through multi-source data utilization such as remote sensing images, DEM(Digital Elevation Model), field survey and on-site monitoring data. The comprehensive weight of each indicator was calculated through the Analytic Hierarchy Process(AHP) and entropy method. The eco-geological environment assessment map was developed by calculating the EGEQ value through the linear weighted method. The assessment results show that the EGEQ was classified into I-V grades from excellent to worse, among which, EGEQ of I-II accounted for 29.88%, EGEQ of III accounted for 32.35% and EGEQ of IV-V accounted for 37.77%;the overall EGEQ of Ganzhou was moderate. The assessment system utilized in this research provides scientific and accurate results, which in turn enable the proposal of some tangible protection suggestions.

关键词： Eco-geological environment assessment Mining city Red soil hilly region AHP Entropy method

Cross-Domain TSK Fuzzy System Based on Semi-Supervised Learning for Epilepsy Classification

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Computer Modeling in Engineering & Sciences 2023年第11期137卷 1613-1633页

作者： Zaihe Cheng Yuwen tao Xiaoqing gu Yizhang Jiang Pengjiang Qian School of Internet of Things Wuxi Institute of TechnologyWuxi214121China School of Artificial Intelligence and Computer Science Jiangnan UniversityWuxi214122China School of Computer Science and Artificial Intelligence Changzhou UniversityChangzhou213164China

Through semi-supervised learning and knowledge inheritance,a novel Takagi-Sugeno-Kang(TSK)fuzzy system framework is proposed for epilepsy data classification in this *** new method is based on the maximum mean discrepancy(MMD)method and TSK fuzzy system,as a basic model for the classification of epilepsy ***,formedical data,the interpretability of TSK fuzzy systems can ensure that the prediction results are traceable and ***,in view of the deviation in the data distribution between the real source domain and the target domain,MMD is used to measure the distance between different data *** objective function is constructed according to the MMD distance,and the distribution distance of different datasets is minimized to find the similar characteristics of different *** introduce semi-supervised learning to further explore the relationship between *** on the MMD method,a semi-supervised learning(SSL)-MMD method is constructed by using pseudo-tags to realize the data distribution alignment of the same *** addition,the idea of knowledge dissemination is used to learn pseudo-tags as additional data ***,for epilepsy classification,the cross-domain TSK fuzzy system uses the cross-entropy function as the objective function and adopts the back-propagation strategy to optimize the *** experimental results show that the new method can process complex epilepsy data and identify whether patients have epilepsy.

关键词： Takagi-Sugeno-Kang fuzzy systems back propagation semi-supervised learning inheritancemechanism transfer learning

Phosphoryl choline-grafted water-soluble carbon nanotube

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Chinese Chemical Letters 2008年第1期19卷 105-109页

作者： tao Zhang Kai Xi Min gu Zheng Sheng Jiang Department of Material Science and Engineering Nanjing University Nanjing 210093 China College of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China Physics Department Nanjing University Nanjing 210093 China

Water-soluble property is the precondition of biomedical evaluation and application of carbon nanotube （CNT）. Novel water- soluble CNT was synthesized in this letter by grafting phosphoryl choline （PC） onto multi-wall CNTs. Utilizing FTIR, XPS, TGA and TEM, the title CNTs were characterized and it was found that the target products could facilely dissolve in water. 2007 tao Zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Carbon nanotube Water-soluble Phosphoryl choline