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Enhanced thermoelectric properties in two-dimensional monolayer Si2BN by adsorbing halogen atoms

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Chinese Physics B 2021年第3期30卷 41-47页

作者： Cheng-Wei wu Changqing Xiang Hengyu Yang wu-Xing zhou Guofeng Xie Baoli Ou Dan wu School of Materials Science and Engineering&Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion Hunan University of Science and TechnologyXiangtan 411201China College of Information Science and Engineering Jishou UniversityJishou 416000China School of Physics and Electronic Science Changsha University of Science and TechnologyChangsha 410114China

Using the first principles calculation and Boltzmann transport theory, we study the thermoelectric properties of Si2BNadsorbing halogen atoms (Si2BN-4X, X = F, Cl, Br, and I). The results show that the adsorption of halogen atoms cansignificantly regulate the energy band structure and lattice thermal conductivity of Si2BN. Among them, Si2BN-4I has thebest thermoelectric performance, the figure of merit can reach 0.50 K at 300 K, which is about 16 times greater than that ofSi2BN. This is because the adsorption of iodine atoms not only significantly increases the Seebeck coefficient due to banddegeneracy, but also rapidly reduces the phonon thermal conductivity by enhancing phonon scattering. Our work proves theapplication potential of Si2BN-based crystals in the field of thermoelectricity and the effective method for metal crystals toopen bandgaps by adsorbing halogens.

关键词： density functional theory thermoelectric effects transport properties electronic structure

A super resolution target separation and reconstruction approach for single channel sar against deceptive jamming

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Defence Technology（防务技术） 2023年第3期21卷 164-175页

作者： Shi-qi Liu Bing Li Bo Zhao Lei Huang Yue-zhou wu Wei-min Bao Guangdong Key Laboratory of Intelligent Information Processing College of Electronic and Information EngineeringShenzhen UniversityShenzhen518060China School of Electrical Engineering Southwest Jiaotong UniversityChengdu611756China State Key Laboratory of Millimeter Waves Southeast UniversityNanjing210096China School of Computer Science Civil Aviation Flight University of ChinaGuanghan618307China China Aerospace Science and Technology Corporation Beijing100048China

The excellent remote sensing ability of synthetic aperture radar(SAR)will be misled seriously when it encounters deceptive jamming which possesses high fidelity and *** this paper,the dynamic synthetic aperture(DSA)scheme is used to extract the difference between the true and false targets.A simultaneous deceptive jamming suppression and target reconstruction method is proposed for a single channel SAR system to guarantee remote sensing *** system model is formulated as a sparse signal recovery problem with an unknown parametric dictionary to be *** iterative reweighted method is employed to jointly handle the dictionary parameter learning and target reconstruction problem in an majorization-minimization framework,where a surrogate function majorizing the Gaussian entropy in the objective function is introduced to circumvent its *** dictionary parameter learning,the grid mismatching problem in a fixed grid based method is ***,the proposed method can reap a super resolution ***,a simple yet effective DSA section scheme is developed for the SAR data excerpting,in which only two DSAs are *** results about location error and reconstruction power error reveal that the proposed method is able to achieve a good performance in deceptive jamming suppression.

关键词： channel resolution separation

Coulomb Interaction in Quantum Dot with a Precessing Magnetic Field

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Communications in Theoretical Physics 2007年第5X期48卷 943-948页

作者： wu Liu-Po zhou Shi-Ping SONG Hong-Yan SHI Yao-Ming Department of Physics Shanghai University Shanghai 200444 China

We study electronic transport through a quantum dot （QD） with a precessing magnetic field. By using the Keldysh nonequilibrium Green function method, formulas of local density of states （LDOS） and conductance of QD are derived self-consistently. It shows that the LDOS and conductance have obvious changes with the Coulomb blockade interaction. The intensity and angle of the magnetic field or temperatures, which reflect the mesoscopic structure of the QD are derived. The superiority of this device is that the QD can be controlled easily by the magnetic field, so it is valuable to apply in generating, manipulating and probing spin state.

关键词： Coulomb interaction quantum dot precessing magnetic field

Unified analytical solutions for a circular opening based on non-linear unified failure criterion

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第2期11卷 71-79页

作者： Chang-guang ZHANG Qing-he ZHANG Jun-hai ZHAO Fei XU Chuang-zhou wu MOE Key Laboratory of Geotechnical and Underground Engineering Tongji University Shanghai 200092 China Department of Geotechnical Engineering Tongji University Shanghai 200092 China School of Civil Engineering Chang'an University Xi'an 710061 China Shanghai No. 1 Municipal Engineering Co. Ltd. Shanghai 200083 China

Unified analytical solutions are presented for the predictions of the stresses and displacements around a circular opening based on nonqinear unified failure criterion and the elastic-brittle-plastic softening model. Unified analytical solutions not only involve generally traditional solutions which are based on the Hock-Brown （H-B） failure criterion or the non-linear twin-shear failure criterion, but also involve other new results. The results of the radius of plastic zone, radial displacements and stresses are obviously different using three rock masses when different values of the unified failure criterion parameter or different material behavior models are used. For a given condition, the radius of plastic zone and radial displacements are reduced by increasing the unified failure criterion parameter. The latent potentialities of rock mass result from considering the effect of intermediate principal stress. It is shown that proper choices of the failure criterion and the material behavior model for rock mass are significant in the tunnel design.

关键词： Analytical solution Elastic-brittle-plastic rock Non-linear unified failure criterion Intermediate principal stress Dilatancy

A comprehensive review on deep learning approaches in wind forecasting applications

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CAAI Transactions on Intelligence Technology 2022年第2期7卷 129-143页

作者： zhou wu Gan Luo Zhile Yang Yuanjun Guo Kang Li Yusheng Xue College of Automation Chongqing UniversityChongqingChina Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhenGuangdongChina School of Electronic and Electrical Engineering University of LeedsLeedsUK State Grid Electric Power Research Institute NanjingJiangsuChina

The effective use of wind energy is an essential part of the sustainable development of human society,in particular,at the recent unprecedented pressure in shaping a low carbon energy *** wind resource and power forecasting play a key role in improving the wind ***,it has not been well adopted in the real-world applications due to the strong stochastic characteristics of wind *** recent years,the application boost of deep learning methods provides new effective tools in wind *** paper provides a comprehensive overview of the forecasting models based on deep learning in the field of wind *** approaches include timeseries-based recurrent neural networks,restricted Boltzmann machines,convolutional neural networks as well as auto-encoder-based *** addition,future development directions of deep-learning-based wind energy forecasting have also been discussed.

关键词： deep learning deep neural networks learning(artificial intelligence)

Binding of Pyrene to Different Molecular Weight Fractions of Dissolved Organic Matter:Effects of Chemical Composition and Steric Conformation

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Chemical Research in Chinese Universities 2012年第4期28卷 624-630页

作者： wu Ji-zhou SUN Hong-wen WANG Cui-ping LI Yong-hong Key Laboratory of Pollution Processes and Environmental Criteria Ministry of EducationCollege of Environmental Science and Engineering State Key Laboratory of Elemento-Organic Chemistry Research Institute of Elemento-Organic ChemistryNankai UniversityTianjin 300071P.R.China

The binding constant（KDOM） of pyrene onto different molecular weight（Mw） fractions of a dissolved organic matter（DOM） extract from an estuarine sediment was measured via a fluorescence quenching method,and the possible binding mechanisms were *** influence of water chemical parameters on pyrene binding was studied to elucidate the effects of DOM steric *** fraction with larger M w（14000） showed a greater KDOM（2.02×10 5） than that with smaller Mw did,and the KDOMs were 1.16×105 and 1.13×105 for the fractions with M w of 1000―14000 and 1000,*** K DOM s of different M w DOM fractions were correlated positively with the atomic ratio of C/H and absorbance at 280 nm;while a negative correlation existed between K DOM and（O＋C）/N（atomic ratio）,and K DOM and O-containing *** correlations indicate the positive influence of aromatic structure and the negative effect of polarity on DOM binding *** spectroscopy revealed that specific interactions existed between pyrene and the DOM fraction with larger M W besides hydrophobic partition,i.e.,NH-π interaction in DOM moiety（1000―14000） and π-π electron donor acceptor（EDA） forces in DOM moiety（14000）.KDOM varied in a complex pattern with increasing cation concentration and pH,which could be explained by the change in DOM steric *** aggregates favored the lipophilic partition of ***,the accessibility to some interior binding sites became low when the aggregate was too large,leading to a reduced KDOM.

关键词： Dissolved organic matter Conformation Water chemistry Pyrene Binding constant

Development and Evaluation of a MAb-Based ELISA for Detection of Chlamy- dophila pneumoniae Infection with Variable Domain 2 and 3 of the Major Outer Membrane protein

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Biomedical and Environmental Sciences 2012年第6期25卷 690-696页

作者： zhou zhou wu Yi Mou CHEN Li Li LIU Guang Chao LIU Liang Zhuan zhou An Wen ZHANG Jun Hua Department of Microbiology and Immunology University of South China Hengyang 421001 Hunan China

Objective This paper aims to develop a monoclonal antibodies （MAbs）- based ELISA for detecting Chlamydophila pneumoniae （C. pneumonioe） antigens in humans with the variable domains （VD） 2 and 3 of the major outer membrane protein （MOMPvD2-VD~） and to assess its sensitivity and specificity by comparing with a widely used MAb that is able to recognize the elementary bodies of C. pneumoniae. Methods MOMPvo2-vo3were overexpressed in Escherichia coil and purified by affinity chromatography. Mice were immunized with the recombinant antigen, and hybridomas secreting MAbs were screened. Three stable hybridomas clones were selected and named 5D6, 7G3, and 8C9. The MAbs-based ELISA was scrutinized for species-specific recognition with a number of human throat swab samples from Group I （156 patients with typical respiratory illness clinically confirmed before） and Group II （57 healthy donors）. Results In Group I, 55 positive cases were detected by anti-EB MAb-based ELISA, 51 cases were positive by MAbs 5D6-based ELISA, and 33 and 38 cases were positive by MAb 8C9 and 7G3-based ELISA respectively. Of the 57 samples from Group II ＂healthy donors＂, 5 were positive and 52 were negative with both anti-EB and 5D6-based tests, while 2 and 3 positive cases were identified by the other two MAb-based ELISAs respectively. Conclusion The novel ***3 MAb-based assay may have higher specificity than the anti-EB MAb, which may possibly be used as an alternative tool for the diagnosis of C. pneumoniae infection.

关键词： Chlamydophila pneumoniae Major outer membrane protein Monoclonal antibody ELISA

Using graphene to suppress the selenization of Pt for controllable fabrication of monolayer PtSe2

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Nano Research 2020年第12期13卷 3212-3216页

作者： Zhong-Liu Liu Zhi-Li Zhu Xu wu Jin-An Shi wu zhou Li-Wei Liu Ye-Liang Wang Hong-Jun Gao Institute of Physics and University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing100190China School of Information and Electronics MIIT Key Laboratory for Low-Dimensional Quantum Structure and DevicesBeijing Institute of TechnologyBeijing100081China CAS Center for Excellence in Topological Quantum Computation Beijing100049China

Platinum diselenide(PtSe2)is a promising transition metal dichalcogenide(TMDC)material with unique *** is necessary to find a controllable fabrication method to bridge PtSe2 with other two-dimensional(2D)materials for practical applications,which has rarely been reported so ***,we report that the selenization of Pt(111)can be suppressed to form a Se intercalated layer,instead of a PtSe2 monolayer,by inducing confined conditions with a precoating of *** with graphene-island samples demonstrate that the monolayer PtSe2 can be controllably fabricated only on the bare Pt surface,while the Se intercalated layer is formed underneath graphene,as verified by atomic-resolution observations with scanning transmission electron microscopy(STEM)and scanning tunneling microscopy(STM).In addition,the orientation of the graphene island shows a negligible influence on the Se intercalated layer induced by the graphene *** extending the application of 2D confined reactions,this work provides a new method to control the fabrication and pattern 2D materials during the fabrication process.

关键词： PtSe2 graphene confined reaction selenization intercalation

Delay-dependent Robust Singular Systems Stabilization for Uncertain with State Delay

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自动化学报 2007年第7期33卷 714-718页

作者： wu Zheng-Guang zhou wu-Neng Mathematics Institute Zhejiang Normal University Jinhua 321004 P.R. China College of Information Science and Technology Donghua University Shanghai 201620 P.R. China

This paper considers the problem of delay-dependent robust stabilization for uncertain singular delay systems. In terms of linear matrix inequality (LMI) approach, a delay-dependent stability criterion is given to ensure that the nominal system is regular, impulse free, and stable. Based on the criterion, the problem is solved via state feedback controller, which guarantees that the resultant closed-loop system is regular, impulse free, and stable for all admissible uncertainties. An explicit expression for the desired controller is also given. Some numerical examples are provided to illustrate the validity of the proposed methods.

关键词：奇异延时系统稳定性时滞依赖性线性矩阵不等式时滞状态不确定性鲁棒镇定