检索结果-南通市图书馆

Electrical Collection Systems for Offshore Wind Farms:A Review

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2021年第5期7卷 1078-1092页

作者： Padmavathi Lakshmanan Ruijuan sun jun Liang CSIR-Central Electronics Engineering Research Institute(CEERI) Pilani RajasthanIndia School of Elctrical Engineering Zhengzhou UniversityZhengzhou 450066China. School of Engineering Cardiff University.UK.

A review of the electrical collection systems in offshore wind farms(OWFs)is presented in this *** review is based on a categorization of offshore wind power electrical collection *** classification encompasses three categories of electrical collection systems,medium voltage AC collection,medium voltage DC collection systems and low frequency AC collection systems(LFAC).This paper summarizes the related research on different collection systems and explores their operational characteristics and *** the initial cost of an OWF is very much influenced,to a great extent,by the configuration of electrical collection and transmission systems,it is necessary to understand the key components and challenges in each collection system configuration.

关键词： DC collection systems LFAC offshore wind farms.

2D/2D Heterostructures:Rational Design for Advanced Batteries and Electrocatalysis

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

Energy & Environmental Materials 2022年第1期5卷 115-132页

作者： jun Mei Ting Liao Ziqi sun School of Chemistry and Physics Queensland University of Technology2 George StreetBrisbane Qld 4000Australia School of Mechanical Medical and Process Engineering Queensland University of Technology2 George StreetBrisbane Qld 4000Australia Centre for Materials Science Queensland University of Technology2 George StreetBrisbane Qld 4000Australia

Two-dimensional/two-dimensional(2D/2D)heterostructures consisting of two or more 2D building blocks possess intriguing electronic features at the nanosized interfacial regions,endowing the possibility for effectively modulating the confinement,and transport of charge carriers,excitons,photons,phonons,*** bring about a wide range of extraordinary physical,chemical,thermal,and/or mechanical *** rational design and synthesis of 2D/2D heterostructures,electrochemical properties for advanced batteries and electrocatalysis can be well regulated to meet some practical *** this review,a summary on the commonly employed synthetic strategies for 2D/2D heterostructures is first given,followed by a comprehensive review on recent progress for their applications in batteries and various electrocatalysis ***,a critical outlook on the current challenges and promising solutions is presented,which is expected to offer some insightful ideas on the design principles of advanced 2D-based nanomaterials to address the current challenges in sustainable energy storages and green fuel generations.

关键词： 2D heterostructures 2D nanomaterials battery electrocatalysis energy storage

First-principle study on the surface atomic relaxation properties of sphalerite

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2012年第9期19卷 775-781页

作者： Jian Liu Shu-ming Wen Yong-jun Xian Shao-jun Bai xiu-min Chen Faculty of Land Resource Engineering Kunming University of Science and Technology Kunming 650093 China National Engineering Laboratory of Vacuum Metallurgy Kunming University of Science and Technology Kunming 650093 China

The surface properties of sphalerite （ZnS） were theoretically investigated using first principle calculations based on the density functional theory （DFT）. DFT results indicate that both the （110） and the （220） surfaces of sphalerite undergo surface atom relaxation after geometry optimization, which results in a considerable distortion of the surface region. In the normal direction, i.e., perpendicular to the sur- face, S atoms in the first surface layer move outward from the bulk （dl）, whereas Zn atoms move toward the bulk （d2）, forming an S-enriched surface. The values of these displacements are 0.003 nm for dl and 0.021 nm for d2 on the （110） surface, and 0.002 nm for dl and 0.011 nm for d2 on the （220） surface. Such a relaxation process is visually interpreted through the qualitative analysis of molecular mechanics. X-ray photoelectron spectroscopic （XPS） analysis provides the evidence for the S-enriched surface. A polysulphide （S n^2- ） surface layer with a bind- ing energy of 163.21 eV is formed on the surface of sphalerite after its grinding under ambient atmosphere. This S-enriched surface and the S 2- surface layer have important influence on the flotation properties ofsphalerite. Keywords：

关键词： sphalerite surface relaxation density fimctional theory froth flotation

Ab Initio Study of Mechanism of Forming a Si-heterocyclic Spiro-Sn-heterocyclic Ring Compound by Cycloaddition Reaction of Cl2Si=Sn: and Ethylene

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2019年第5期38卷 673-678,667页

作者： TAN Xiao-jun LU xiu-Hui School of Biological Science and Technology University of Jinan Jinan 250022 China School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China

X2Si=Sn:(X = H, Me, F, Cl, Br, Ph, Ar…) are new species of chemistry. The cycloaddition reaction of X2Si=Sn: is a new study field of stannylene chemistry. To explore the rules of cycloaddition reaction between X2Si=Sn: and the symmetric p-bonded compounds, the cycloaddition reactions of Cl2Si=Sn: and ethylene were selected as model reactions in this *** mechanism of cycloaddition reaction between singlet Cl2Si=Sn: and ethylene has been first investigated with the MP2/GENECP(C, H, Cl, Si in 6-311++G**;Sn in LanL2dz) method in this paper. From the potential energy profile, it could be predicted that the reaction has one dominant reaction channel. The reaction rule presented is that the 5p unoccupied orbital of Sn in Cl2Si=Sn: and the π orbital of ethylene forming a p→p donor-acceptor bond, resulting in the formation of an intermediate. Instability of the intermediate makes it isomerize to a four-membered Si-heterocyclic ring stannylene. Because the 5p unoccupied orbital of Sn atom in the four-membered Si-heterocyclic ring stannylene and the π orbital of ethylene form a p→p donor-acceptor bond, the four-membered Si-heterocyclic ring stannylene further combines with ethene to form another intermediate. Because the Sn atom in the intermediate shows sp3 hybridization after transition state, the intermediate isomerizes to a Si-heterocyclic spiro-Sn-heterocyclic ring compound. The research result indicates the laws of cycloaddition reaction between X2Si=Sn: and the symmetric π-bonded compounds. The study opens up a new research field for stannylene chemistry.

关键词： Cl2Si=Sn: four-membered Si-heterocyclic ring stannylene spiro-Sn-heterocyclic ring compound potential energy profile

Nusselt number correlation for turbulent heat transfer of helium-xenon gas mixtures

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2021年第11期32卷 119-133页

作者： Biao Zhou Yu Ji jun sun Yu-Liang sun Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China

A gas-cooled nuclear reactor combined with a Brayton cycle shows promise as a technology for highpower space nuclear power ***,a helium-xenon gas mixture with a molecular weight of14.5-40.0 g/mol is adopted as the working fluid to reduce the mass and volume of the *** Prandtl number for helium-xenon mixtures with this recommended mixing ratio may be as low as *** the convective heat transfer is closely related to the Prandtl number,different heat transfer correlations are often needed for fluids with various Prandtl *** studies have established heat transfer correlations for fluids with medium-high Prandtl numbers(such as air and water)and extremely lowPrandtl fluids(such as liquid metals);however,these correlations cannot be directly recommended for such helium-xenon mixtures without *** study initially assessed the applicability of existing Nusselt number correlations,finding that the selected correlations are unsuitable for helium-xenon *** establish a more general heat transfer correlation,a theoretical derivation was conducted using the turbulent boundary layer *** simulations of turbulent heat transfer for helium-xenon mixtures were carried out using Ansys *** on simulated results,the parameters in the derived heat transfer correlation are *** is found that calculations using the new correlation were in good agreement with the experimental data,verifying its applicability to the turbulent heat transfer for helium-xenon *** effect of variable gas properties on turbulent heat transfer was also analyzed,and a modified heat transfer correlation with the temperature ratio was *** on the working conditions adopted in this study,the numerical error of the property-variable heat transfer correlation was almost within 10%.

关键词： Gas-cooled nuclear reactor Space nuclear power Helium–xenon mixtures Convective heat transfer Nusselt number

Passivity-Based Stabilization for Switched Stochastic Nonlinear Systems

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1307-1309页

作者： Yaowei sun jun Zhao School of Automation Zhengzhou University of AeronauticsZhengzhou 450046 Henan Key Laboratory of General Aviation Technology Zhengzhou University of AeronauticsZhengzhou 450046China College of Information Science and Engineering Northeastern UniversityShenyang 110819China

Dear Editor,This letter addresses the passivity-based mean square exponential stabilization problem for switched stochastic nonlinear systems.A concept of generalized small-time norm-observability is presented and an appropriate test condition is also *** pre-given passivity rate and average dwell time,a set of feedback controllers is designed by use of the passivity property.

关键词： property letter stabilization

A new method for direct synthesis of Li2CO3 powders by membrane electrolysis

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2018年第8期37卷 716-722页

作者： Xi-Juan Pan Ting-An Zhang Zhi-He Dou Guo-Zhi Lyu xiu-xiu Han jun-Jie Zhang School of Metallurgy Northeastern University Shenyang 110819 China Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Education Ministry Shenyang 110819China

A new method for the direct synthesis of Li2CO3 powders by membrane electrolysis from LiC1 solution is demonstrated in this paper, where a novel electrolysis system combining ventilation, agitation and loop filtration functions was reported. The aim of this work is to explore the effect of the starting concentration of LiC1 on the phase and micromorphology of Li2CO3 crystals and thereafter to explore the mechanism of crystallization and grain growth law. Scanning electron microscopy （SEM） images indicate that the particles become irregular polycrystalline from well-defined flower-like and the micro-crystals change from lamellar to needle-like and subsequently to smaller globular granules, and the surface of the crystals becomes smooth with LiC1 concentration increasing from 50 to 400 g.L^-3. The crystalline phases of the different samples were characterized using powder X-ray diffraction （XRD） and the results prove that pure LiaCO3 crystals can be obtained in a single step by the electrolysis method. The particle size distributions show that both volume mean crystal sizes and the full width at half maximum （FWHM） decrease when the starting LiC1 concentration increases from 50 to 300 g.L 3 and also decreases from 400 to 300 g-L^-3.

关键词： Lithium carbonate Lithium chloride Membrane electrolysis Carbon dioxide

The first snapshot study on horizontal distribution and identification of five peritrich ciliates (Genus Vorticella Linnaeus and Zoothamnium Bory de St. Vincent) from the eastern Indian Ocean

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2018年第10期37卷 79-85页

作者： MUNIR Sonia sun jun Tianjin Key Laboratory of Marine Resources and Chemistry Tianjin University of Science and Technology Research Centre for Indian Ocean Ecosystem Tianjin University of Science and Technology

Epipont peritrich ciliates are one of the most sessilie protists that attached to the substrate of zooplankton communities especially copepods and crustaceans. Peritrich ciliates can be solitary or colonial form found from the coastal zones and embayment around the world. Present research report is the first snapshot study of the peritrich ciliates and the horizontal distribution in open waters from surface to 200 m depth in the eastern Indian Ocean. Recently, five peritrich ciliates, e.g., Vorticella oceanica, Zootharnnium alternans, Z. alrasheidi, Z. pelagicum, and Z. marinum were collected from plankton net tow samples during the cruise from April 10 to May 13, 2014. The characteristics of the peritrich ciliate were determined according to the shape of the zooids, the ciliary structure and the stalks. The morphometric shape, sizes and characters also explained by examination under light/scanning electron microscopy. Vorticella oceanica and Z. pelagicum showed their association with host such as diatom （i.e, Chaetoceros coarctatus） and copepod （Oithona brevicornis） including some individuals around the dinoflagellate species （Ceraitum tripose）. The distribution of these sessilid ciliates was dominated by the V. oceanica, Z. pelagicum and Z. rnarinurn at the southeast zone while the large colonies of Z. alrasheidi observed at the Bay of Bengal. This distribution can be influenced by substrate availability like diatom （Ch. coarctatus） and copepods （O. brevicornis）.

关键词： Vorticella oceanica Zoothamnium alternans Zoothamnium alrasheidi Zoothamnium marinum Zoothamnium pelagicum eastern Indian Ocean

Correction to “Maturity of associating liver partition and portal vein ligation for staged hepatectomy-derived liver regeneration in a rat model [World J Gastroenterol 2018 March 14; 24(10): 1107-1119]”

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2018年第10期24卷 4517-4518页

作者： Yi-Fan Tong xiu-jun Cai Department of General Surgery Sir Run Run Shaw Hospital School of Medicine Zhejiang University

Correction to:Tong YF,Meng N,Chen MQ,Ying HN,Xu M,Lu B,Hong JJ,Wang YF,Cai *** of associating liver partition and portal vein ligation for staged hepatectomy-derived liver regeneration in a rat model(World J Gastroenterol 2017;24(10):1107-1119)[1].Erratum:In the“Conclusion of Abstract”,“Core tip”,“Discussion”and“Research perspectives”,the description regarding the relationship between the volumetric and functional proliferation during ALPPS-derived liver regeneration should be ***,the sentence that reads“as the ALPPS-derived proliferation in volume lags behind the functional regeneration”should be revised to“as the ALPPS-derived functional regeneration lags behind the proliferation in volume”.

关键词： liver Cai tip be