检索结果-南通市图书馆

Numerical study on the characteristics of natural supercavitation by planar symmetric wedge-shaped cavitators for rotational supercavitating evaporator

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2015年第6期58卷 1072-1083页

作者： ZHENG ZhiYing LI FengChen LI Qian KULAGIN vladimir A School of Energy Science and Engineering Harbin Institute of Technology Department of Heat Technology and Fluid Dynamics Siberian Federal University

With the application of supercavitation effect, a novel device named rotational supercavitating evaporator(RSCE) was recently designed for desalination. In order to improve the blade shape of rotational cavitator in RSCE for performance optimization and then design three-dimensional blades, numerical simulations are conducted on the supercavitating flows(with cavitation number ranging from 0.055 to 0.315) around two-dimensional planar symmetric wedge-shaped cavitators with different wedge angles varied from 10 to 180 degrees. Proper numerical method for simulating supercavitating flows around planar symmetric cavitator is established, and assessment of k-ε-v2 -f turbulence model in simulating cavitating flows is conducted. It shows that the size of computational domain would affect the simulation result. Empirical formulae for supercavity dimensions about cavitation number at different wedge angles are obtained, which are of significant importance in the subsequent design of three-dimensional blade. The characteristics of resistance at different wedge angles are discussed, which, together with the characteristics of supercavity dimensions, play important roles in the optimal design of RSCE.

关键词： rotational supercavitating evaporator desalination planar symmetric wedge-shaped cavitators CFD numerical simulation

Guest editorial: special issue on wide area monitoring, protection and control in smart grid

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2016年第3期4卷 317-318页

作者： vladimir TERZIJA Yutian LIU The University of Manchester ManchesterUK Shandong University JinanChina

Complexity of modern electrical power systems is steadily *** is inspiring researchers and developers to propose new solutions capable to address a number of challenges,particularly those related to power system operation.A massive penetration of asynchronously connected renewable energy generation,the generation connected over inverters,is significantly changing the dynamics of modern power *** one hand,the power system response time is becoming shorter and at the same time the fault level is becoming *** is significantly affecting requirements of control loops,as well as power system protection.

关键词： Guest editorial protection and control in smart grid special issue on wide area monitoring

Humanization for neurological disease modeling:A roadmap to increase the potential of Drosophila model systems

在线全文

学校读者我要写书评

暂无评论

Animal Models and Experimental Medicine 2023年第3期6卷 230-236页

作者： vladimir L.Katanaev Department of Cell Physiology and Metabolism Faculty of MedicineUniversity of GenevaGenevaSwitzerland HumanaFly Facility Faculty of MedicineUniversity of GenevaGenevaSwitzerland

Neuroscience and neurology research is dominated by experimentation with *** 75%of neurology disease-associated genes have orthologs in Drosophila mel-anogaster,the fruit fly amenable to complex neurological and behavioral ***,non-vertebrate models including Drosophila have so far been unable to significantly replace mice and rats in this field of *** reason for this situ-ation is the predominance of gene overexpression(and gene loss-of-function)meth-odologies used when establishing a Drosophila model of a given neurological disease,a strategy that does not recapitulate accurately enough the genetic disease condi-tions.I argue here the need for a systematic humanization approach,whereby the Drosophila orthologs of human disease genes are replaced with the human *** approach will identify the list of diseases and the underlying genes that can be adequately modeled in the fruit fly.I discuss the neurological disease genes to which this systematic humanization approach should be applied and provide an example of such an application,and consider its importance for subsequent disease modeling and drug discovery in Drosophila.I argue that this paradigm will not only advance our un-derstanding of the molecular etiology of a number of neurological disorders,but will also gradually enable researchers to reduce experimentation using rodent models of multiple neurological diseases and eventually replace these models.

关键词： disease modeling Drosophila humanization neurological diseases

Analytical solution for a strong free-surface water vortex describing flow in a full-scale gravitational vortex hydropower system

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2021年第1期14卷 72-79页

作者： vladimir Joel Alzamora Guzman Julie Anne Glasscock Energy Research Group Kadagaya Research Centre for Appropriate TechnologyJunin 12866Peru

Strong free-surface water vortices are found throughout industrial hydraulic systems used for water treatment,flow regulation,and energy *** models using the volumetric flow rate as a model input have generally been semi-empirical,and have tended to have some limitations in terms of the design of practical hydropower *** this study,an analytical model of a strong free-surface water vortex was *** model only requires the water head and geometric parameters as its inputs and calculates the maximum volumetric flow rate,aircore diameter,and rotational *** experimental depthedischarge data from a full-scale gravitational vortex hydropower system,unavailable in the relevant literature,were obtained,and the simulated results showed excellent agreement with the experimental *** data could be used to verify similar models using laboratory-scale physical models in order to investigate the scaling *** contrast to previous models,this model does not assume a constant average velocity across the vortex radius and allows precise calculation of the resultant velocity ***,this model presents advantages in turbine design for energy generation systems.

关键词： Gravitational vortex Velocity measurements Scalability Analytical model Microhydropower

Polychromatic Fourier-PAM fluorometry and hyperspectral analysis of chlorophyll fluorescence from Phaseolus vulgaris leaves: Effects of green light

在线全文

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2020年第2期7卷 204-211页

作者： vladimir Lysenko Ya Guo Alexey Kosolapov Elena Usova Tatyana Varduny vladimir Krasnov Southern Federal University Academy of Biology and BiotechnologyRostov-on-DonRussia Russian Information-Analytical and Water Management Research Center Rostov-on-DonRussia School of IoT Engineering Jiangnan UniversityWuxiChina Rostov State Medical University Department of General and Clinical Biochemistry No.1Rostov-on-DonRussia

Maximal and partial quantum yields of photosystem II(Fv/Fm and Fv–/Fp)in Phaseolus vulgaris leaves were determined in response to the turning on saturating and low(undersaturating)actinic light,*** lights(ML)of blue,green,and red colors were applied simultaneously using a novel method of the polychromatic fast Fourier transforming pulse amplitude modulation(FFT PAM)chlorophyll *** of ML were cross-combined with the colors of low and saturating actinic ***/Fm values measured with the green ML were found to be close to that of red light,whereas application of blue ML leads to lower Fv/*** addition,5-nm resolved excitation spectra were measured to evaluate the dependence between red/far red fluorescence ratios(peak height based–F685/F730,and deconvolved peak square based–F685sq/F730sq)and wavelength of the excitation *** demonstrates that chlorophyll fluorescence ratio red/far red may be dependent on the spectral absorbance of *** data obtained confirm the results of the previous studies which explain high photosynthetic activity of the green light in terms of redistribution of absorbed quanta throughout thickness of the leaf,thus suggesting possible advisability of green light application in greenhouse lighting,especially for the plants having thick leaves.

关键词： Multicolor PAM Fourier transforms Chlorophyll fluorescence Green light Red/far red ratio Greenhouse lighting

High-temperature annealing of(201)β-Ga_(2)O_(3) substrates for reducing structural defects after diamond sawing

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

Journal of Semiconductors 2023年第12期44卷 125-132页

作者： Pavel Butenko Michael Boiko Mikhail Sharkov Aleksei Almaev Aleksnder Kitsay vladimir Krymov Anton Zarichny vladimir Nikolaev MISiS University Moscow 119049Russia Perfect Crystala LLC St.Petersburg 194223Russia Tomsk State University Tomsk 634050Russia

A commercial epi-ready(201)β-Ga_(2)O_(3) wafer was investigated upon diamond sawing into pieces measuring 2.5×3 mm^(2).The defect structure and crystallinity in the cut samples has been studied by X-ray diffraction and a selective wet etching *** density of defects was estimated from the average value of etch pits calculated,including near-edge regions,and was obtained close to 109 cm^(-2).Blocks with lattice orientation deviated by angles of 1-3 arcmin,as well as non-stoichiometric fractions with a relative strain about(1.0-1.5)×10^(-4)in the[201]direction,were *** perfection was shown to decrease significantly towards the cutting lines of the *** reduce the number of structural defects and increase the crystal perfection of the samples via increasing defect motion mobility,the thermal annealing was *** and formation of a mosaic structure coupled with dislocation wall appearance upon 3 h of annealing at 1100℃ was *** fractions characterized by non-stoichiometry phases and the block deviation *** annealing for 11 h improved the homogeneity and perfection in the *** average density of the etch pits dropped down significantly to 8×10^(6) cm^(-2).

关键词： gallium oxide epi-ready substrate etch pits crystal defect mosaic structure crystal perfection

A clustering-based approach for mining dockerfile evolutionary trajectories

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

Science China(Information Sciences) 2019年第1期62卷 211-213页

作者： Yang ZHANG Huaimin WANG vladimir FILKOV Key Laboratory of Parallel and Distributed Computing National University of Defense Technology College of Computer National University of Defense Technology DECAL Lab University of California Computer Science Department University of California

Dear editor,Docker;), as a de-facto industry standard [1], enables the packaging of an application with all its dependencies and execution environment in a light-weight, self-contained unit, i.e., *** launching the container from Docker image, developers can easily share the same operating system, libraries, and binaries [2]. As the configuration file, the dockerfile plays an important role,

关键词： A clustering-based approach for mining dockerfile evolutionary trajectories

Modified Ceria-Zirconia Fluorite-Like Catalysts for the Combustion of Methane

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 Natural Gas Chemistry 2006年第3期15卷 149-163页

作者： Tatiana Kuznetsova Vladislav Sadykov Lubsan Batuev Ella Moroz Elena Burgina vladimir Rogov vladimir Kriventsov Dmitrii Kochubey Boreskov Institute of Catalysis SB RAS Pr. Lavrentieva5Novosibirsk630090Russia

For dispersed ceria-zirconia-based solid solutions prepared via the polymerized complex method and annealed at 700 ℃, effects of bulk doping by Ca, Mn, Co, Bi or Nb cations and surface modification by Mn and Pt on their structural features, surface/bulk oxygen reactivity and catalytic activity in methane combustion are considered. With up to 20 mol% doping, a structural type of homogeneous solid solutions of anion-deficient fluorite with disordered anion vacancies is formed. Doping by transition metal cations or Pt increases the mobility and reactivity of the surface/bulk oxygen. A broad variation in specific rates of methane combustion for the studied systems was observed, suggesting structural sensitivity of this reaction. In general, there is no universal relationship between the oxygen mobility, the reactivity and the catalytic activity in methane combustion, which is explained by the factor of specific methane activation on surface active sites. For the Pt-promoted samples, Pt efficiency in methane activation depends on the Pt-support interaction, and the most favorable ones being mixed Pt/MnOx and Pt/NbOx clusters on the surface of the supports that exhibit high lattice oxygen mobilities.

关键词： Ce-Zr-O Ca Mn Co Bi Nb structural features oxygen reactivity oxygen mobility methane combustion

On the helium bubble swelling in nano-oxide dispersion-strengthened steels

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第10期105卷 172-181页

作者： vladimir Krsjak Tielong Shen Jarmila Degmova Stanislav Sojak Erik Korpas Pavol Noga Werner Egger Bingsheng Li vladimir Slugen Frank A.Garner Slovak University of Technology Faculty of Electrical Engineering and Information TechnologyInstitute of Nuclear and Physical EngineeringIlkovicova 3Bratislava 81219Slovakia Chinese Academy of Sciences Institute of Modern PhysicsLanzhou 730000China Slovak University of Technology Faculty of Materials Science and TechnologyAdvanced Technologies Research InstituteJana Bottu 2781/25Trnava 91724Slovakia Universität der Bundeswehr München Institut für Angewandte Physik und Messtechnik LRT2Werner-Heisenberg-Weg 39Neubiberg85577Germany Southwest University of Science and Technology State Key Laboratory for Environment-friendly Energy MaterialsMianyangSichuan 621010China Texas A&M University Nuclear Engineering DepartmentCollege StationTX 77843USA Radiation Effects Consulting LLC Richland WA 99354USA

The development of structural materials resistant to harsh radiation environments requires an in-depth understanding of the early stage of the aging *** radiation environments with high transmutation helium production rates such as in fusion and spallation applications,even materials with otherwise acceptable radiation stability may suffer from radiation embrittlement related to helium bubble *** theoretical modeling of helium-assisted cavity nucleation in pure metals and simple alloys provides some useful guidelines at the atomic scale level,these,however,do not overlap with the size resolution of available experimental *** this study,we employed slow positron beam spectroscopy to characterize the nucleation and growth of nano-scale helium bubbles in martensitic steels strengthened by thermodynamically stable nano-oxide *** combination with transmission electron microscopy,we experimentally characterized the evolution of helium bubbles from small clusters of radiation-induced vacancies to large cavities well resolvable by *** radiation resistance of oxide-dispersion strengthened steels dominates only in the early stages of bubble evolution,where positron lifetime measurements provide a missing piece of the microstructural puzzle conventionally constructed by TEM.

关键词： Ion irradiation Bubble swelling Helium Positron annihilation spectroscopy Oxide dispersion strengthened steels