检索结果-南通市图书馆

The atmospheric hinder for intraseasonal sea-air interaction over the Bay of Bengal during Indian summer monsoon in CMIP6

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2022年第10期41卷 119-130页

作者： ze Meng Lei Zhou Baosheng Li Jianhuang Qin Juncheng xie School of Oceanography Shanghai Jiao Tong UniversityShanghai200030China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519080China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China College of Oceanography Hohai UniversityNanjing266071China Marine Science and Technology College Zhejiang Ocean UniversityZhoushan316000China

The surroundings of the Bay of Bengal(Bo B)suffer a lot from the extreme rainfall events during Indian summer monsoon(ISM).Previous studies have proved that the sea-air interaction is an important factor for the monsoonal *** the 6th Coupled Modol Inter-comparison Project(CMIP6)models,this study examined the biases of surface heat flux,which is the main connection between atmosphere and *** show that although CMIP6 have a better simulation of intraseasonal sea surface temperature(SST)anomalies over Bo B than the previous ones,the“atmospheric blockage”still delays the response of latent heat flux to the oceanic ***,during the increment of positive latent heat flux in CMIP6,the negative contribution from wind effects covers most of the positive contribution from humidity effects,due to the underestimate of humidity *** diagnostic analysis denote that the surface air humidity has a quarter of a phase ahead of warm SST in observation,but gets wet along with the warm SST accordingly in most CMIP6 *** a result,the simulated transfer of intraseasonal moisture flux is hindered between ocean and ***,as a bridge between both sides,the atmospheric boundary layer is essential for a better sea-air coupled simulation,especially when the atmospheric and the oceanic variabilities involved in a climate model becomes increasingly *** surface air humidity and boundary layer processes require more attention as well as better simulations.

关键词： Bay of Bengal ocean-atmosphere interaction CMIP6 latent heat flux intraseasonal variability

Tunable band structure and effective mass of disordered chalcopyrite

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2017年第1期12卷 51-56页

作者： ze-Lian Wang Wen-Hui xie Yong-Hong Zhao College of Physics and Electronic Engineering Institute of Solid State Physics Sichuan Normal University Chengdu 610068 China Department of Physics East China Normal University Shanghai 200062 China

The band structure and effective mass of disordered chalcopyrite photovoltaic materials Cul-xAgxGaX2 （X = S, Se） are investigated by density functional theory. Special quasirandom structures are used to mimic local atomic disorders at Cu/Ag sites. A local density plus correction method is adopted to obtain correct semiconductor band gaps for all compounds. The bandgap anomaly can be seen for both sulfides and selenides, where the gap values of Ag compounds are larger than those of Cu compounds. Band gaps can be modulated from 1.63 to 1.78 eV for CU1-xAgxGaSe2, and from 2.33 to 2.64 eV for Cu1-xAgxGaS2. The band gap minima and maxima occur at around x = 0.5 and x = 1, respectively, for both sulfides and selenides. In order to show the transport properties of Cu1-xAgxGaX2, the effective mass is shown as a function of disordered Ag concentration. Finally, detailed band structures are shown to clarify the phonon momentum needed by the fundamental indirect-gap transitions. These results should be helpful in designing high-efficiency photovoltaic devices, with both better absorption and high mobility, by Ag-doping in CuGaX2.

关键词： disorder electronic structure effective mass

Revisit the γ-Ray Flare Associated with Blazar Mrk 421

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第12期24卷 55-62页

作者： Xiang-tao zeng ze-Yuan Tang Jun-Hui Fan Center for Astrophysics Guangzhou University Greater Bay Brand Center of the National Astronomical Data Center Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province

A Very High-energy(VHE) flare was observed by Major Atmospheric Gamma Imaging Cherenkov Telescopes on MJD 57788. This VHE flare was characterized by increased VHE flux and short timescales. In this study, we used one-zone synchrotron self-Compton, two-zone, and spine/layer models to explore this VHE flare's origin. The results indicate that this γ-ray flare can be explained by Inverse Compton Scattering radiation from the layer contributed gamma radiation and results in the γ-ray flare in a different way than the two-zone model. The difference between the two models lies in the performance of spectral energy distribution after γ-ray flare as well as a possible difference in the timescales of the flare.

关键词： (galaxies:) BL Lacertae objects: individual (Mrk 421) galaxies: jets radiation mechanisms: non-thermal

Enhancing anoxic denitrification of low C/N ratio wastewater with novel ZVI composite carriers

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第2期34卷 180-191页

作者： Yanping Shi tao Liu Hongtao Yu xie Quan Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

External organic carbon sources are needed to provide electron donors for the denitrification of wastewater with a low COD/NO_(3)^(-)-N(C/N)ratio,increasing the treatment *** economic strategy is to enhance the bioactivity and/or biodiversity of denitrifiers to efficiently utilize organic substances in *** this study,novel zero-valent iron(ZVI)composite carriers were prepared and implemented in a suspended carrier biofilm reactor to enhance the bioactivity and/or biodiversity of *** the influent C/N ratio of 4(COD was 179.5±5.0 mg/L and TN was 44.2±0.8 mg/L),COD and TN removal efficiencies were 85.1%and 66.4%,respectively,in the reactors filled with 3 wt%ZVI composite *** contrast,COD and TN removal efficiencies were 70.4%and 55.3%,respectively,in the reactor filled with conventional high-density polyethylene(HDPE)biofilm *** biofilm formation on the 3 wt%ZVI composite carriers was optimized due to its higher roughness(surface square roughness increased from 76.0 nm to 93.8 nm)and favorable hydrophilicity(water contact angle dropped to 72.5°±1.4°from 94.3°±3.2°)compared with the HDPE biofilm *** addition,heterotrophic denitrifiers,Thauera and Dechloromonas,were enriched,whereas autotrophic denitrifiers,Raoultella and Thiobacillus,exhibited high relative abundance in the biofilm of ZVI composite *** coexistence of heterotrophic denitrifiers and autotrophic denitrifiers on the surface of ZVI composite carriers provided mixotrophic metabolism of denitrification(including heterotrophic and iron-based autotrophic),thereby ensuring effective denitrification for wastewater with a low C/N ratio without external organic carbon source addition.

关键词： ZVI Biofilm carrier Low C/N ratio Integrated floating fixed-film and activated sludge(IFFAS) Denitrification

Investigation of the effect of filling level on the wear and vibration of a SAG mill by DEM

在线全文

学校读者我要写书评

暂无评论

Particuology 2022年第4期20卷 24-34页

作者： Changhua xie Yuan Zhao tao Song Yongzhi Zhao Institute of Process Equipment Zhejiang UniversityHangzhou 310027China State Key Laboratory of Process Automation in Mining & Metallurgy.Beijing 100160 China Beijing Key Laboratory of Process Automation in Mining & Metallurgy Beijing 100160China

Semi-autogenous grinding(SAG)mill is widely used in the grinding process of coal and ores because of its strong applicability,large capacity and low consumption of grinding ***,the research of SAG mill is still of great important practical *** those parameters of the SAG mill,the flling level is very important for it is not only directly related to the processing capacity of the mill,but also affects the operation cost and stability of *** this paper,combined with shear impact energy model(SIEM)and discrete element method(DEM),the particle collision energy spectrum was applied to analyze the influence of ore flling level and media flling level on the power draw of the mill,the impact energy on ore,and the wear of liner and media in a slice of an industrial SAG *** was found that increasing the ore flling level would increase energy consumption and reduce the energy efficiency and the wear of liner and grinding ***,the vibration of mill was explored from the collision energy on *** results showed that the low frequency but high energy ollision between grinding media and liner was the main reason for liner wear and mill vibration.

关键词： Flling level SAG mill Collision energy DEM Wear Vibration

Graph-ranking collective Chinese entity linking algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2020年第2期14卷 291-303页

作者： tao xie Bin WU Bingjing JIA Bai WANG Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and TelecommunicationsBeijing 100876China

Entity linking(EL)systems aim to link entity mentions in the document to their corresponding entity records in a reference knowledge *** EL approaches usually ignore the semantic correlation between the mentions in the text,and are limited to the scale of the local knowledge *** this paper,we propose a novel graphranking collective Chinese entity linking(GRCCEL)algorithm,which can take advantage of both the structured relationship between entities in the local knowledge base and the additional background information offered by external knowledge *** improved weighted word2vec textual similarity and improved PageRank algorithm,more semantic information and structural information can be captured in the *** an incremental evidence mining process,more powerful discrimination capability for similar entities can be *** evaluate the performance of our algorithm on some open domain *** results show the effectiveness of our method in Chinese entity linking task and demonstrate the superiority of our method over state-of-the-art methods.

关键词： collective entity linking knowledge mapping word embedding entity correlation graph PageRank

Deciphering and engineering high-light tolerant cyanobacteria for efficient photosynthetic cell factories

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第2期34卷 82-91页

作者： Yaru xie Lei Chen tao Sun Weiwen Zhang Laboratory of Synthetic Microbiology School of Chemical Engineering&TechnologyTianjin UniversityTianjin 300072China Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering Ministry of Education of ChinaTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China Center for Biosafety Research and Strategy Tianjin UniversityTianjin 300072China Law School Tianjin UniversityTianjin 300072China

Development and utilization of“liquid sunshine”could be one of key solutions to deal with the issues of fossil fuel depletion and increasing carbon *** are the only prokaryotes capable of performing oxygenic photosynthesis,and their activity accounts for~25%of the total carbon fixation on *** importantly,besides their traditional roles as primary producers,cyanobacteria could be modified as“photosynthetic cell factories”to produce renewable fuels and chemicals directly from CO_(2) driven by solar energy,with the aid of cutting-edging synthetic biology *** their large-scale biotechnological application in the future,many challenges still need to be properly addressed,among which is cyanobacterial cell factories inevitably suffer from high light(HL)stress during large-scale outdoor cultivation,resulting in photodamage and even cell death,limiting their *** this review,we critically summarized recent progress on deciphering molecular mechanisms to HL and developing HL-tolerant chassis in cyanobacteria,aiming at facilitating construction of HLresistant chassis and promote the future application of the large-scale outdoor cultivation of cyanobacterial cell ***,the future directions on cyanobacterial chassis engineering were discussed.

关键词： High-light Stress Chassis Cell factories Cyanobacteria

Condition Monitoring for Railway Point Machines Based on Sound Analysis and Support Vector Machine

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第4期29卷 786-792页

作者： SUN Yongkui CAO Yuan xie Guo WEN tao School of Electronic and Information Engineering Beijing Jiaotong University National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi'an University of Technology

Railway point machines(RPMS) are one of the key equipments in the railway system to switch different routes for the *** monitoring for RPMs is a vital measure to keep train operation safe and *** convenience and low cost into consideration, a novel intelligent condition monitoring method for RPMs based on sound analysis is ***-domain and frequency-domain features are obtained,and normalized using z-score standardization method to eliminate the influences of different *** particle swarm optimization(BPSO) is utilized to select the most significant discrimination feature *** effects of the selected optimal features are verified using Support vector machine(SVM), 1-Nearest neighbor(1 NN), Random forest(RF), and Naive Bayes(NB).Experiment results indicate SVM performs best on identification accuracy and computing cost compared with the other three *** identification accuracies on normal switching and reverse switching processes reach100% and 99.67%, respectively, indicating the feasibility of the proposed method.

关键词： Condition monitoring Sound analysis Railway point machines(RPMs) Binary particle swarm optimization(BPSO) Support vector machine(SVM)

Conversion of Methane to Ethylene with BaCe_(0.9)Y_(0.1)Co_(x)O_(3-δ)Hydrogen Permeation Membrane

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2021年第7期40卷 901-907,839页

作者： LIU Yun YUAN Sheng-ze xie Kui College of Chemistry Fuzhou UniversityFuzhou 350116China Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China

Dehydrogenation coupling of methane(DCM),which can be effectively used to produce low carbon alkenes,has the advantages of rich raw materials,simple reaction device,low energy consumption,***,we report a series of Co doped perovskite porous-dense BaCe_(0.9)Y_(0.1)Co_(x)O_(3-δ)(BCYCx)membrane for *** treatment in a reduced atmosphere,a large number of Co nanoparticles will exsolute on the surface of *** metal-oxide interface is helpful to activate the C–H bonds,inhibit the carbon deposition,and so *** XRD,SEM and XPS prove that Co nanoparticles homogeneously distributed on the BCYCx porous layers,which will create a large quantity of catalytic active *** 1100℃,the highest concentration of C_(2)product was 5.66%(5.25%ethane+0.41%ethylene)in output gas when methane conversion reaches a maximum value of 24.8%,and the C_(2)selectivity gets to 45.6%.We further demonstrate the catalytic performance of high-temperature DCM without obvious decrease after running for 30 hours.

关键词： mixed-conducting dehydrogenation methane metal nanoparticle membrane

同方期刊数据库