检索结果-南通市图书馆

Carrier transportation in polycrystalline CuInSe_2 thin films with Cu-deficient grain boundaries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2015年第7期34卷 510-516页

作者： bo yin Chao-Gang Lou School of Electronic Science and Engineering Southeast University

The interface energies and electronic structures of(112) grain boundaries of Cu In Se2 thin films were investigated by first-principle *** is found that the grain boundary with a Cu vacancy has low interface energy and exists widely in the *** Cu deficiency may cause the charge imbalance and result in an upward band bending at the grain *** also weakens the repulsion between Cu-3d orbital and Se-4p orbital and leads to the downward shift of valence band *** two mechanisms,namely the band bending from the charge imbalance and the depression of the valence band maximum, have effects on the(112) grain boundaries with different *** change of band structure forms a potential barrier to prevent electrons or holes from approaching the grain boundary and reduces their *** might be used to explain the effects of the grain boundary on carrier transportation and why polycrystalline Cu(In,Ga)Se2thin film solar cells have better performance than single-crystal cells.

关键词： First principle CuInSe2 Grain boundary Interface e

Meniscus-Assisted Solution Printing Enables Cocrystallization in Poly(3-alkylthiophene)-based Blends for Field-Effect Transistors

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2023年第8期41卷 1269-1276,I0009页

作者： Shu-yin zhu Juan Peng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200438China

The formation of cocrystallization in two various conjugated components may endow the newly formed conjugated cocrystals with multiple functionalities and improved charge transport ***,compared to conjugated small molecules,this strategy is rather limitedly realized in conjugated ***,a simple meniscus-assisted solution printing(MASP)strategy is utilized to achieve the cocrystallization in the blends of two conjugated polymers,i.e.,poly(3-hexylthiophene)(P3HT)and poly(3-octylthiophene)(P3OT),and the cocrystalline structures are correlated closely to their charge *** P3HT/P3OT blends phase separate and crystallize individually in their drop-cast thin *** subjecting the P3HT/P3OT blended solution to MASP,the confined solvent evaporation between two nearly parallel plates triggers them to cocrystallize progressively when accelerating the moving lower *** cocrystallization kinetics and the changes in P3HT/P3OT molecular structures are ***,these different crystalline structures of P3HT/P3OT blends are applied in organic fieldeffect transistors,imparting the cocrystallization-enhanced charge transport than respective P3HT and P3OT crystal *** MASP method can be extended to craft cocrystals of other conjugated polymer blends for their diverse optoelectronic applications.

关键词： Conjugated polymer blends Polythiophene Cocrystallization Charge mobility Meniscus-assisted solution printing

Flight Schedule Recovery under Uncertain Airport Capacity

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2016年第4期33卷 479-490页

作者： zhu bo zhu Jinfu College of Civil Aviation Nanjing University of Aeronautics and Astronautics

Airlines adjust their flight schedules to satisfy more stringent airport capacity constraints caused by inclement weather or other unexpected *** problem will be more important and complicated if uncertain disruptions occur in hub airports.A two-stage stochastic programming model was established to deal with the realtime flight schedule recovery and passenger re-accommodation *** first-stage model represents the flight re-timing and re-fleeting decision in current time period when capacity information is deterministic,while the second-stage recourse model evaluates the passenger delay given the first-stage solutions when one future scenario is *** at the large size of the problem and requirement for quick response,an algorithmic framework combining the sample average approximation and heuristic method was *** computational results indicated of that the proposed method could obtain solutions with around 5% optimal gaps,and the computing time was linearly positive to the sample size.

关键词： flight recovery passenger re-accommodation two-stage stochastic model sample average approximation heuristic method

Understanding primary and secondary sources of ambient oxygenated volatile organic compounds in Shenzhen utilizing photochemical age-based parameterization method

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第1期31卷 105-114页

作者： bo zhu Yu Han Chuan Wang Xiaofeng Huang Shiyong Xia yingbo Niu Zixuan yin Lingyan He Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School

Oxygenated volatile organic compounds(OVOCs) are key intermediates in the atmospheric photooxidation process. To further study the primary and secondary sources of OVOCs,their ambient levels were monitored using a proton-transfer reaction mass spectrometer(PTR-MS) at an urban site in the Pearl River Delta of China. Continuous monitoring campaigns were conducted in the spring, summer, fall, and winter of 2016. Among the six types of OVOC species, the mean concentrations of methanol were the highest in each season(up to 13–20 ppbv), followed by those of acetone, acetaldehyde and acetic acid(approximately 2–4 ppbv), while those of formic acid and methyl ethyl ketone(MEK) were the lowest(approximately 1–2 ppbv). As observed from a diurnal variation chart, the OVOCs observed in Shenzhen may have been affected by numerous factors such as their primary and secondary sources and photochemical consumption. The photochemical age-based parameterization method was used to apportion the sources of ambient OVOCs. Methanol had significant anthropogenic primary sources but negligible anthropogenic secondary sources during all of the seasons. Acetone, MEK and acetic acid were mostly attributed to anthropogenic primary sources during each season with smaller contributions from anthropogenic secondary sources. Acetaldehyde had similar contributions from both anthropogenic secondary and anthropogenic primary sources throughout the ***, anthropogenic primary sources contributed the most to formic acid.

关键词： OVOCs PTR-MS Photochemical age-based parameterization method

Strong decays of the P_(cs)(4459) as a Ξc D^(*) molecule

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2021年第12期64卷 104-110页

作者： Feng Yang yin Huang HongQiang zhu School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031China College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 401331China Asia Pacific Center for Theoretical Physics Pohang University of Science and TechnologyPohang 37673Korea

In this work,we study the strong decay of the newly observed P_(cs)(4459),assuming that it is a pureΞcD^(*)molecular ***ering two possible spin-parity assignments J^(P)=1/2^(−)and J^(P)=3/2^(−),the partial decay widths of theΞcD^(*)molecular state into J/ψΛ,D^(−)_(s)Λ^(+)_(c),and DΞ^((′))_(c) final states through hadronic loops are evaluated with the help of the effective *** comparison with the LHCb data,the S-waveD^(*)Ξc molecular with J^(P)=1/2^(−)assignment for P_(cs)(4459)is supported by our study,while the P_(cs)(4459)in spin-parity J^(P)=3/2^(−)case may be explained as an S-wave coupled bound state with lagerΞcD^(*)*** addition,the calculated partial decay widths with J^(P)=1/2^(−)ΞcD^(*)molecular state picture indicate that allowed decay mode,DΞ′c,may have the biggest branching *** experimental measurements for this strong decay process could be a crucial test for the molecule interpretation of the P_(cs)(4459).

关键词： molecular state strong decay effective Lagrangians

Improved clustering method based on artificial immune

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2010年第6期21卷 1111-1115页

作者： Lin zhu bo Li School of Management Tianjin University Tianjin 300072 E R. China

An improved clustering method based on artificial immune is proposed. To obtain the better initial solution, the initial antibody network is introduced by self organizing map （SOM） method. In the process of the clustering iteration, a series of optimization and evolution strategies are designed, such as clustering satisfaction, the threshold design of scale compression, the learning rate, the clustering monitoring points and the clustering evaluations indexes. These strategies can make the clustering thresholds be quantified and reduce the operator’s subjective factors. Thus, the local optimal and the global optimal clustering simultaneously are proposed by the synthesized function of these strategies. Finally, the experiment and the comparisons demonstrate the proposed method effectiveness.

关键词： artificial immune system (AIS) clustering self organizing map (SOM).

Literature overview of basic characteristics and flotation laws of flocs

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 943-958页

作者： Wanzhong yin Yu Xie Zhanglei zhu School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China College of Chemistry and Chemical Engineering Xi’an University of Science and TechnologyXi’an 710054China

Flocculation flotation is the most efficient method for recovering fine-grained minerals,and its essence lies in flotation and recovery of *** physical characteristics of flocs are mainly determined by their apparent particle size and structure(density and morphology).Substantial researches have been conducted regarding the effect of floc characteristics on particle settling and water ***,the influence of floc characteristics on flotation has not been widely *** on the floc formation and flocculation flotation,this study reviews the fundamental physical characteristics of flocs from the perspectives of floc particle size and structure,summarizing the interaction between floc particle size and ***,it thoroughly discusses the effect of floc particle size and structure on floc floatability,further revealing the influence of floc characteristics on bubble collision and adhesion and elucidating the mechanisms of interaction between flocs and ***,it is observed that floc particle size is not the only factor influencing flocculation *** the appropriate apparent particle size range,flocs with a compact structure exhibit higher efficiency in bubble collision and adhesion during flotation,thereby resulting in enhanced flotation *** study aims to provide a reference for flocculation flotation,targeting the development of more efficient and refined flocculation flotation processes in the future.

关键词： flocs basic characteristics particle size and structure flotation laws bubbles

Sliding-mode control for a rolling-missile with input constraints

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2020年第5期31卷 1041-1050页

作者： HUA Siyu WANG Xugang zhu yin The 802 Institute of Shanghai Academy of Space Flight Technology Shanghai 201100China School of Energy and Power Engineering Nanjing University of Science and TechnologyNanjing 210094China

This paper investigates the overload stabilization problem of the rolling-missile subject to parameters uncertainty and actuator saturation. In order to solve this problem, a sliding-mode control(SMC) scheme is technically employed by using the backstepping approach to make the dynamic system stable. In addition,SMC with the tanh-type switching function plays an important role in reducing intrinsic vibration. Furthermore, an auxiliary system(AS) is developed to compensate for nonlinear terms arising from input saturation. Finally, the simulation results provide a solution to demonstrate that the suggested SMC and the AS methodology have advantages of strong tracking capability, anti-interference ability and anti-saturation performance.

关键词： input constraint back-stepping approach sliding-mode control(SMC) auxiliary control system

Rational construction of metal–base synergetic sites on Au/Mg-beta catalyst for selective aerobic oxidation of 5-hydroxymethylfurfural

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第11期30卷 599-609,I0014页

作者： Zhiguo zhu Xiongjie Gao Xiuming Wang Mengdie yin Qingyao Wang Wanzhong Ren bo Wang Hongying Lü Weiping Liao College of Chemistry and Chemical Engineering Yantai University30 Qingquan RoadYantai 264005ShandongChina Library Yantai University30 Qingquan RoadYantai 264005ShandongChina Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059ShandongChina

The selective aerobic oxidation of biomass-derived 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid (FDCA, a potential renewable substitution of fossil-based terephthalic acid to produce polyethylene 2,5-furandicarboxylate plastic) is an appealing transformation for constructing eco-friendly and sustainable chemical processes. Au supported catalysts have showed encouraging performances for this well-received conversion, whose catalytic behavior was greatly affected by the adopted support derived from the existence of metal-support interactions. Herein, a series of Mg-Beta zeolites were hydrothermally synthesized via developed structural reconstruction, which were employed as basic supports for Au catalysts to construct bifunctional catalysts. The relationship between structure (Au particle size, basicity within zeolites and Auδ+ contents) and FDCA yield was concretely established. The conclusion was made that the utilization of Mg-Beta zeolites with strong basicity as the support could not only improve the FDCA yield but also decrease the amount of additional base. Furthermore, the possible reaction mechanism was also proposed via tracking time-dependent variations of corresponding organics and controlled experiment. This work provides some guidance for rationally designing multifunctional catalysts in the view of integrating metal catalysts with metallosilicate zeolites, which was beneficial to the catalytic upgrading of organic compounds with multiple functional groups.

关键词： 5-Hydroxymethylfurfural Aerobic oxidation 2,5-Furandicarboxylic acid Bifunctional Au/Mg-Beta catalyst Structural reconstruction