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High luminescent polymers for stretchable displays

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National Science Review 2023年第1期10卷 11-13页

作者： zhitao zhang Zhenan Bao Department of Chemical Engineering Stanford University School of Chemistry and Chemical Engineering Shanghai Jiao Tong University

Displays severing as the human-machine interface are playing indispensable roles in our daily *** machine displays information visually to allow the user to respond ***,traditional bulky and rigid displays cannot meet the requirements of the fast-developing wearable electronics,considering skin compatibility,portability and durability under exercise [1].

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Existence and bifurcation of solutions for a double coupled system of Schrdinger equations

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Science China Mathematics 2015年第8期58卷 1607-1620页

作者： TIAN RuShun zhang zhitao Academy of Mathematics and Systems Science and HUA Loo-Keng Key Laboratory of MathematicsChinese Academy of Sciences

Consider the following system of double coupled Schrodinger equations arising from Bose-Einstein condensates etc., where μ1, μ2 are positive and fixed; κ and β are linear and nonlinear coupling parameters respectively. We first use critical point theory and Liouville type theorem to prove some existence and nonexistence results on the positive solutions of this system. Then using the positive and non-degenerate solution to the scalar equation -△ω ＋ ω = ω3, ω ∈ Hr1（RN）, we construct a synchronized solution branch to prove that for/3 in certain range and fixed, there exist a series of bifurcations in product space R×Hr1（RN）×Hr1（RN） with parameter κ,

关键词： bifurcation system of Schr6dinger equations positive solution synchronized solution branch

Positive solutions for a multi-parameter system of second-order ordinary differential equations

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Science China Mathematics 2011年第5期54卷 959-972页

作者： CHENG XiYou zhang zhitao Department of Applied Mathematics Nanjing Audit University Nanjing 210029 China Institute of Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

In this paper, we establish the product formula for the fixed point index on product cone, andthen, as applications, consider the existence, nonexistence and multiplicity of positive solutions for a second-order ordinary differential system with parameters. The discussion is based on the product formula and thefundamental properties of the fixed point index.

关键词： positive solution ordinary differential systems fixed point index

The feasibility study of the indium oxide supported silver catalyst for selective hydrogenation of CO_(2)to methanol

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Green Energy & Environment 2022年第4期7卷 807-817页

作者： Kaihang Sun zhitao zhang Chenyang Shen Ning Rui Chang-jun Liu School of Chemical Engineering and Technology Tianjin UniversityTianjin300072China

Silver catalyst has been extensively investigated for photocatalytic and electrochemical CO_(2) ***,its high activity for selective hydrogenation of CO_(2) to methanol has not been ***,the feasibility of the indium oxide supported silver catalyst was investigated for CO_(2) hydrogenation to methanol by the density functional theoretical(DFT)study and then by the experimental *** DFT study shows there exists an intense Ag-In_(2)O_(3) interaction,which causes silver to be positively *** positively charged Ag species changes the electronic structure of the metal,facilitates the formation of the Ag-In_(2)O_(3) interfacial site for activation and dissociation of carbon *** promoted CO_(2) dissociation leads to the enhanced methanol synthesis via the CO hydrogenation route as CO_(2)^(*)→CO^(*)→HCO^(*)→H_(2)CO^(*)→H_(3)CO^(*)→H_(3)COH^(*).The Ag/In_(2)O_(3)catalyst was then prepared using the deposition-precipitation *** experimental study confirms the theoretical *** methanol selectivity of CO_(2) hydrogenation on Ag/In_(2)O_(3) reaches 100.0%at reaction temperature of 200℃.It remains more than 70.0%between 200 and 275℃.At 300℃and 5 MPa,the methanol selectivity still keeps 58.2%with a CO_(2) conversion of 13.6%and a space-time yield(STY)of methanol of 0.453 g_(methanol)g_(cat)^(-1)h^(-1),which is the highest methanol STY ever reported for silver *** catalyst characterization confirms the intense Ag-In_(2)O_(3)interaction as well,which causes high Ag dispersion,increases and stabilizes the oxygen vacancies and creates the active Ag-In_(2)O_(3)interfacial site for the enhanced CO_(2)hydrogenation to methanol.

关键词： Carbon dioxide Hydrogenation Methanol Indium oxide Silver

Model of soybean NDVI change based on time series

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International Journal of Agricultural and Biological Engineering 2014年第5期7卷 64-70页

作者： zhang zhitao Yubin Lan Wu Pute Han Wenting College of Water Resources and Architectural Engineering Northwest A&F UniversityYangling 712100China Aerial Application Technology USDA-ARS-SPARC-AATRUCollege StationTX 77845USA Institute of Water Saving Agriculture in Arid Area of China Northwest A&F UniversityYangling 712100China

Normalized Difference Vegetation Index(NDVI)has been found to have good correlations with many physical properties of soybean *** to the factors of air temperature,humidity,solar radiation,soil moisture,etc.,NDVI of soybean varies dynamically in a *** establishment of the soybean NDVI prediction model at different times in a day can effectively modify this *** soybean NDVI values are continuously monitored in hours during soybean seeding,flowering&podding and maturating stages by way of Green *** show that the trend of NDVI change every day in the three stages is taken on as a reverse *** NDVI value reaches to the maximum at 8 am or 9 am and decreases to its minimum at 2 pm before a moderate rise.A model for intraday and long-term NDVI change for soybean is *** test of the model with independent data indicates that the precision meets the demands,with the root mean square error(RMSE)of each day being 3.95,5.45 and 2.86 for the seeding stage,the bean podding stage and the maturation period,*** prediction RMSEs of the soybean NDVI model for soybeans of the three stages for the fifth day are 5.75,2.65 and 5.51,respectively and the prediction RMSEs for the sixth day are 9.74,2.82 and 14.04,respectively according to the data from the first four days.

关键词： model NDVI monitoring time time series atmospheric radiation soybean

Standing Waves of Fractional Schrödinger Equations with Potentials and General Nonlinearities

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Analysis in Theory and Applications 2023年第4期39卷 357-377页

作者： Zaizheng Li Qidi zhang zhitao zhang School of Mathematical Sciences Hebei Normal UniversityShijiazhuangHebei 050024China Hebei Center for Applied Mathematics ShijiazhuangHebei 050024China Department of Mathematics The University of Hong KongHong KongChina School of Mathematical Sciences Jiangsu UniversityZhenjiangJiangsu 212013China HLM Academy of Mathematics and Systems Sciencethe Chinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

We study the existence of standing waves of fractional Schrodinger equations with a potential term and a general nonlinear term:iut-(-Δ)^(s)u-V(x)u+f(u)=0,(t,x)∈R_(+)×R^(N),where s∈(0,1),N>2s is an integer and V(x)≤0 is *** precisely,we investigate the minimizing problem with L2-constraint:E(a)=inf{1/2∫_(R_(N))|(-△)^(s/2)u|^(2)+V(x)|u|^(2)-2F(|u|)|u∈H^(s)(R^(N)),||u||_(L^(2))^(2)(R^(N))=α.Under general assumptions on the nonlinearity term f(u)and the potential term V(x),we prove that there exists a constant a00 such that E(a)can be achieved for all a>a_(0),and there is no global minimizer with respect to E(a)for all 00.

关键词： Fractional Schrodinger equation standing wave normalized solution

Characteristics of DBD micro-discharge at different pressure and its effect on the performance of oxygen plasma reactor

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Plasma Science and Technology 2019年第5期21卷 5-13页

作者： Rui LIU Zhe YU Huijuan CAO Pu LIU zhitao zhang College of Science Dalian Maritime UniversityDalian 116026People's Republic of China Institute of Marine Engineering Dalian Maritime UniversityDalian 116026People's Republic of China

The oxygen plasma reactor based on dielectric barrier discharge principle can produce a high concentration of reactive oxygen species,which can cooperate with hydraulic cavitation gas-liquid mixer to realize the application of advanced oxidation technology in water *** this technology,the work pressure of the oxygen plasma reactor is decreased by the vacuum suction effect generated in the snap-back section of the gas-liquid mixed *** this paper,the characteristics of single micro-discharge at different pressures were investigated with the methods of discharge image,electrical characteristics and spectral diagnosis,in order to analyze the electrical characteristics and reactive oxygen species generation efficiency of oxygen plasma reactor at the pressure range from 60 kPa to 100 *** study indicated that,when the pressure decreases,the duty ratio of ionization in the discharge gap and number of electrons with high energy increases,leading to a rise in reactive oxygen species *** the oxygen reaches the maximum ionization,the concentration of reactive oxygen species is the ***,the discharge intensity continues to increase,producing more heat,which will decompose the ozone and lower the production of reactive oxygen *** oxygen plasma reactor has an optimum working pressure at different input powers,which makes the oxygen plasma reactor the most efficient in generating reactive oxygen species.

关键词： atmospheric pressure plasma reactor pressure active oxygen particle dielectric barrier discharge

Research situation and progress of non-equilibrium plasma chemistry

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Chinese Science Bulletin 2002年第7期47卷 529-530页

作者： Bai Xiyao zhang zhitao Han Hui Bai Mindong Environmental Engineering Research Institute Dalian Maritime University Dalian China

Generally, the non-equilibrium plasma is produced at low pressure by a glow discharge (1.33Pa-1.33 kPa) including the radio frequency (13.56 MHz), microwave (2450 MHz), AC or DC high voltage discharges. As a method to directly apply energy to a reaction system, some successful applications have been obtained in the fields such as chemical synthesis and decomposition at plasma, sputtering and filming, deposition at the gas state, polymerization, modification on the material surface, etching, ashing at low temperature and so on. For example,

关键词： CO Research situation and progress of non-equilibrium plasma chemistry high

Synergistic effect of the metal-support interaction and interfacial oxygen vacancy for CO_(2) hydrogenation to methanol over Ni/In_(2)O_(3) catalyst:A theoretical study

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Journal of Energy Chemistry 2022年第2期31卷 623-629页

作者： Chenyang Shen Qianqian Bao Wenjuan Xue Kaihang Sun zhitao zhang Xinyu Jia Donghai Mei Chang-jun Liu Collaborative Innovation Center of Chemical Science&Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China State Key Laboratory of Membrane Separation and Membrane Processes School of Environmental Science and EngineeringTiangong UniversityTianjin 300387China

Indium oxide supported nickel catalyst has been experimentally confirmed to be highly active for CO_(2) hydrogenation towards *** this work,the reaction mechanism for CO_(2) hydrogenation to methanol has been investigated on a model Ni/In_(2)O_(3) catalyst,i.e.,Ni_(4)/In_(2)O_(3),via the density functional theory(DFT)*** possible reaction pathways,i.e.,the formate pathway,CO hydrogenation and the reverse water-gas-shift(RWGS)pathways,have been examined on this model *** has been demonstrated that the RWGS pathway is the most theoretically-favored for CO_(2) hydrogenation to *** complete RWGS pathway follows CO_(2)+6 H→COOH+5 H→CO+H_(2)O+4 H→HCO+H_(2)O+3 H→H_(2)CO+H_(2)O+2 H→H_(3)CO+H_(2)O+H→H_(3)COH+H_(2) ***,it has been also proved that the interfacial oxygen vacancy can serve as the active site for boosting the CO_(2) adsorption and charge transfer between the nickel species and indium oxide,which synergistically promotes the consecutive CO_(2) hydrogenation towards methanol.

关键词： CO_(2)hydrogenation Indium oxide Nickel Methanol synthesis Oxygen vacancy Density functional theory