检索结果-南通市图书馆

Microsystems & Nanoengineering 2023年第3期9卷 411-417页

作者： B.K.Xiang S.y.Wang y.F.Wang j.j.Zhu H.T.Xu y.H.Wang State Key Laboratory of Surface Physics and Department of Physics FudanUniversity200433 ShanghaiChina Shanghai Research Center for Quantum Sciences 201315 ShanghaiChina

A nanofabricated superconducting quantum interference device(nano-SQUID)is a direct and sensitive flux probe used for magnetic imaging of quantum materials and mesoscopic *** to the functionalities of superconductive integrated circuits,nano-SQUIDs fabricated on chips are particularly versatile,but their spatial resolution has been limited by their planar ***,we use femtosecond laser 3-dimensional(3D)lithography to print a needle onto a nano-SQUID susceptometer to overcome the limits of the planar *** nanoneedle coated with a superconducting shell focused the flux from both the field coil and the *** performed scanning imaging with such a needle-on-SQUID(NoS)device on superconducting test patterns with topographic *** NoS showed improved spatial resolution in both magnetometry and susceptometry relative to the planarized *** work serves as a proof-of-principle for integration and inductive coupling between superconducting 3D nanostructures and on-chip josephson nanodevices.

关键词： lithography SQUID needle

Filters and structure of lattice implication algebra

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 Science Bulletin 1997年第18期42卷 1517-1520页

作者： Liu, j Xu, y Department of Applied Mathematics Southwest Jiaotong University Chengdu China

IN order to research the logical system whose propositional value is given in a lattice from

关键词： lattice implication algebra filter generated filter.

Benefits of Stochastic Optimization for Scheduling Energy Storage in Wholesale Electricity Markets

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 2021年第1期9卷 181-189页

作者： Hyeong jun kim Ramteen Sioshansi Antonio j.Conejo the Department of Integrated Systems Engineering The Ohio State UniversityColumbusOhioUSA the Department of Electrical and Computer Engineering The Ohio State UniversityColumbus.OhioUSA

We propose a two-stage stochastic model for optimizing the operation of energy storage. The model captures two important features: uncertain real-time prices when day-ahead operational commitments are made;and the price impact of charging and discharging energy storage. We demonstrate that if energy storage has full flexibility to make real-time adjustments to its day-ahead commitment and market prices do not respond to charging and discharging decisions, there is no value in using a stochastic modeling framework, i.e., the value of stochastic solution is always zero. This is because in such a case the energy storage behaves purely as a financial arbitrageur day ahead, which can be captured using a deterministic *** show also that prices responding to its operation can make it profitable for energy storage to "waste" energy, for instance by charging and discharging simultaneously, which is normally sub-optimal. We demonstrate our model and how to calibrate the price-response functions from historical data with a practical case study.

关键词： Energy storage stochastic optimization value of stochastic solution electricity market

Hardness-thermal stability synergy in nanograined Ni and Ni alloys:Superposition of nanotwin and low-energy columnar boundary

在线全文

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2023年第6期137卷 123-131页

作者： F.H.Duan y.Lin Q.Li j.H.Luan j.Lu j.Pan y.Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Laboratory of Nanomaterials&Nanomechanics Department of Mechanical EngineeringCity University of Hong KongHong KongChina State Key Laboratory of Material Processing and Die&Mould Technology and School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Department of Materials Science and Engineering City University of Hong KongHong KongChina Centre for Advanced Structural Materials Greater Bay Joint DivisionShenyang National Laboratory for Materials ScienceCity University of Hong Kong Shenzhen Research InstituteShenzhen 518057China City U-Shenzhen Futian Research Institute Shenzhen 518045China

Refining grains into nanoscale can significantly strengthen and harden metallic materials;however,nanograined metals generally exhibit low thermal stability,hindering their practical *** this work,we exploit the superposition of the contribution of nanotwins,low-angle grain boundaries,and microalloying to tailor superior combinations of high hardness and good thermal stability in Ni and Ni *** the nanotwinned Ni having a twin thickness of∼2.9 nm and grain size of 28 nm,it exhibits a hardness over 8.0 GPa and an onset coarsening temperature of 623 K,both of which are well above those of nanograined ***/Mo microalloying can further improve the onset coarsening temperature to 773 K without comprising *** analyses reveal that high hardness is achieved via strengthen-ing offered by extremely fine ***,the superior thermal stability is mainly ascribed to the low driving force for grain growth induced by the low-angle columnar boundary architecture and to the additional pinning effect on the migration of twin/columnar boundaries provided by minor Re/Mo *** present work not only reveals a family of nanotwinned metals possessing the combination of ultra-high hardness and high thermal stability but also provides a strategy for tailoring properties of metallic materials by pairing low-angle grain boundaries and twin boundaries.

关键词： Nanotwin Thermal stability Hardness Low-angle grain boundary Microalloying

Polymersome formation by solvent annealing-induced structural reengineering under 3D soft confinement

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2021年第12期14卷 4644-4649页

作者： Xi Mao Hao Li jinwoo kim Shuai Deng Renhua Deng Bumjoon j.kim jintao Zhu Key Laboratory of Material Chemistry for Energy Conversion and Storage of Ministry of Education(HUST) and State Key Laboratory of Materials Processing and Die&Mold TechnologySchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan430074China Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea

A solvent annealing-induced structural reengineering approach is exploited to fabricate polymersomes from block copolymers that are hard to form vesicles through the traditional solution self-assembly *** specifically,polystyrene-b-poly(4-vinyl pyridine)(PS-b-P4VP)particles with sphere-within-sphere structure(SS particles)are prepared by three-dimensional(3D)soft-confined assembly through emulsion-solvent evaporation,followed by 3D soft-confined solvent annealing upon the SS particles in aqueous dispersions for structural engineering.A water-miscible solvent(e.g.,THF)is employed for annealing,which results in dramatic transitions of the assemblies,e.g.,from SS particles to *** approach works for PS-b-P4VP in a wide range of block ***,this method enables effective encapsulation/loading of cargoes such as fluorescent dyes and metal nanoparticles,which offers a new route to prepare polymersomes that could be applied for cargo release,diagnostic imaging,and nanoreactor,etc.

关键词： polymersome block copolymer three-dimensional(3D)confinement self-assembly solvent annealing

COMMUNICATION TURNS GREEN CONSTRUCTION PLANNING INTO REALITy

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 Green Building 2017年第1期12卷 168-186页

作者： joseph j.kim Christopher W.Goodwin Sunkuk kim Department of Civil Engineering and Construction Management California State University Long Beach International scholar of Department of Architectural Engineering Kyung Hee UniversityKorea Los Angeles Unified School District Los AngelesCAUSA Department of Architectural Engineering Kyung Hee UniversityKorea

Green planning is critically important during the design phases of construction projects but continually gets less attention during *** owners and planners need to understand how communication influences green *** address a gap in the extant research,this paper presents the evaluation results on how sustainability awareness of field supervision personnel impacts the successful completion of school projects by proving that communicating sustainability goals with them is vital for decision-making during the construction stage of the *** paper uses data collected from 162 new school construction projects to compare sustainability design goals with their successful incorporation into completed ***-one project managers and inspectors were surveyed to assess their awareness of key high-performance sustainability requirements that were built into the *** responses from these two groups were compared to examine the positive or negative *** analysis results show that early and continuous communication of sustainability design goals with field supervision personnel has a significant impact on whether those goals are realized when the project is turned over to the owner for *** implementation of sustainability goals not only provides economic benefits from fully exploiting life-cycle costs,but also holds the promise of providing a healthier working environment.

关键词： green buildings building design school buildings project management sustainable development

A study on low emittance injector and undulator for PAL-XFEL

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2015年第3期3卷 41-49页

作者： j.Hong j.-H.Han S.j.Park y.G.jung D.E.kim H.-S.Kang j.Pflueger Pohang Accelerator Laboratory European XFEL

For the success of PAL-XFEL, two critical systems, namely a low emittance injector and a variable gap out-vacuum undulator, are under development. In order to realize the target emittance of the PAL-XFEL injector we carried out an optimization study of various parameters, such as the laser beam transverse profile, the laser pulse length, the laser phase,and the gun energy. The transverse emittance measured at the Injector Test Facility(ITF) is εx=0.48±0.01 mm *** undulator prototype based on the EU-XFEL design and modified for PAL-XFEL was built and tested. A local-K pole tuning procedure was developed and tested. A significant reduction(90%) of the local-K fluctuation was observed. The requirement of undulator field reproducibility better than 2×10-4and the undulator gap setting accuracy below 1 μm were achieved for the prototype. The optical phase jitter after the pole height tuning at the tuning gap was calculated to be 2.6? rms, which satisfies the requirement of 5.0?.

关键词： emittance free-electron lasers(FELs) photocathode RF-gun undulator

A Characteristic Non-Reflecting Boundary Treatment in Lattice Boltzmann Method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2008年第6期25卷 1964-1967页

作者： kim Dehee kim Hyung Min jHON Myung S VINAy Ⅲ Stephen j. BUCHANAN john Department of Chemical Engineering Carnegie Mellon University 5000 Forbes Ave Pittsburgh PA 15213 USA Division of Mechanical System Design Engineering Kyonggi University Suwon Kyonggi-do Korea Bechtel Bettis Inc West Mifflin PA 15122 USA

In lattice Boltzmann methods, disturbances develop at the initial stages of the simulation, the decay characteristics depend mainly on boundary treatment methods; open boundary conditions such as equilibrium and bounce-back schemes potentially generate uncontrollable disturbances. Excessive disturbances originate from non-physical reflecting waves at boundaries. Characteristic boundary conditions utilizing the signs of waves at boundaries which suppress these reflecting waves, as well as their implementation in the lattice Boltzmann method, are introduced herein. The performance of our novel boundary treatment method to effectively suppress excessive disturbances is verified by three different numerical experiments.

关键词： HyPERBOLIC SySTEMS EQUATION FLOWS

The Effect of Reflector with Sound-Absorbing Material on Supersonic jet Noise

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 Thermal Science 2005年第1期14卷 22-27页

作者： y.-H.KWEON M.TSUCHIDA y.MIyAZATO T.AOKI H.-D.kim T.SETOGUCHI Department of Energy and Environmental Engineering Kyushu University Kasuga 816-8580Japan School of Mechanical Engineering Andong National University Andong 760-749Korea Department of Mechanical Engineering Saga University Saga 840-8502Japan

This paper describes an experimental work to investigate the effect of a reflector on supersonic jet noise radiated from a convergent-divergent nozzle with a design Mach number *** the present study,a metal reflector and reflectors made of three different sound-absorbing materials(grass wool and polyurethane foam)were employed,and the reflector size was *** measurement is carried out to obtain the acoustic characteristics such as frequency,amplitude of screech tone and overall sound pressure level(OASPL).A high-quality schlieren optical system is used to visualize the detailed structure of supersonic *** results obtained show that the acoustic characteristics of supersonic jet noise are strongly dependent upon the jet pressure ratio and the reflector *** is also found that the reflector with sound-absorbing material reduces the screech tone amplitude by about 5-13dB and the overall sound pressure levels by about 2-5dB,compared with those of the metal reflector.

关键词： supersonic jet supersonic jet noise screech tone OASPL reflector sound-absorbing material.