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The Search for the Quantum Spin Liquid in Kagome Antiferromagnets

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Chinese Physics Letters 2019年第5期36卷 5-6页

作者： j.-j.wen Y.S.Lee Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Department of Applied Physics Stanford University

A quantum spin liquid (QSL) is an exotic quantum ground state that does not break conventional symmetries and where the spins in the system remain dynamic down to zero temperature. Unlike a trivial paramagnetic state,... 详细信息

关键词： The Search for the Quantum Spin Liquid in Kagome Antiferromagnets Zn

Syntheses and Characterization of Metal Complexes of　L－Lysine－N，N，N＇，N＇－tetraacetic　Acid　and　L－Lysine－N，N，N＇，N＇－tetramethylenepho　sphonic　Acid

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Chemical Research in Chinese Universities 1995年第3期11卷 276-278页

作者： ZHOU, RX LU, ZR wen, j WUHAN UNIV DEPT CHEMWUHAN 430072PEOPLES R CHINA

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ＳｙｎｔｈｅｓｅｓａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＭｅｔａｌＣｏｍｐｌｅｘｅｓＯｆＬ－Ｌｙｓｉｎｅ－Ｎ，Ｎ，Ｎ＇，Ｎ＇－ｔｅｔｒａａｃｅｔｉｃＡｃｉｄａｎｄＬ－Ｌｙｓｉｎｅ－Ｎ，Ｎ，Ｎ＇，Ｎ＇－ｔｅｔｒａｍｅｔｈｙｌｅｎｅｐｈＯｓｐｈｏｎｉ...

关键词： L-Lysine Coniplex Relaxivity

Tensile and shearing behaviors of the particle raft

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Acta Mechanica Sinica 2021年第6期37卷 904-909,I0001页

作者： P.C.Zuo H.Yu j.L.Liu Z.j.wen College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao266580China School of Science China University of Petroleum(East China)Qingdao266580China Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao266590China

The particle raft is a two-dimensional condensed soft matter,which is composed of hydrophobic solid particles floating on a liquid *** this study,we have realized to conduct tension and shear experiments on the particle raft by using the self-assembled loading *** crack initiation and propagation are observed by the camera,and the curve of the non-dimensional force with respect to the displacement is *** experimental results have been compared with the particle flow code 3D(PFC3D)simulation,and they are in excellent *** indicates that the particle raft possesses mechanical properties between solid and *** findings provide some inspirations on engineering new devices and new materials at the microscale.

关键词： Particle raft Tension Shear Crack Force–displacement curve

Design and simulation of self-powered radio frequency identification (RFID) tags for mobile temperature monitoring

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Science China(Technological Sciences) 2013年第1期56卷 1-7页

作者： CHU HeQun WU GuangMin CHEN jianMing FEI Fei MAI john D LI wen j MEMS Laboratory Department of Physics Faculty of Science Kunming University of Science and Technology Department of Mechanical and Biomedical Engineering City University of Hong Kong

This paper presents a design for a self-powered radio frequency identification (RFID) tag with a thin film bulk acoustic reso- nating piezoelectric power supply (PPS), which can be used for portable remote temperature monitoring. We call this system a PPS-RFID for short. The RFID systems have been found to have many applications in the internet of things (IOT) in the past decade. But semi-active RFID tags require an onboard battery which limits their applications in many fields. For these reasons, our research focuses on power sources for the RFID tags. This paper emphasizes the circuit design and simulation of PPS. In our tests, 0.283 mW was generated by PPS at 1 Hz vibration by a 650 N impact force. The results showed that the integrated PPS could supply sufficient power for the designed PPS-RFID tag. The PPS-RFID tag can be widely used for temperature monitoring during mobile transport of perishable items such as medicines or food.

关键词： self-powered radio frequency identification (RFID) piezoelectric temperature monitoring energy harvesting internet of things

Rapid nanomolding of nanotopography on flexible substrates to control muscle cell growth with enhanced maturation

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Microsystems & Nanoengineering 2021年第6期7卷 71-85页

作者： Cong Wu Chriss S.M.Chin Qingyun Huang Ho-Yin Chan Xinge Yu Vellaisamy A.L.Roy wen j.Li Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Biomedical Engineering City University of Hong KongHong KongChina james Watt School of Engineering University of GlasgowGlasgow G128QQUK

In vivo,multiple biophysical cues provided by highly ordered connective tissues of the extracellular matrix regulate skeletal muscle cells to align in parallel with one ***,in routine in vitro cell culture environments,these key factors are often missing,which leads to changes in cell ***,we present a simple strategy for using optical media discs with nanogrooves and other polymer-based substrates nanomolded from the discs to directly culture muscle cells to study their response to the effect of biophysical cues such as nanotopography and substrate *** extend the range of study of biophysical cues for myoblasts by showing that they can sense ripple sizes as small as a 100 nm width and a 20 nm depth for myotube alignment,which has not been reported *** results revealed that nanotopography and substrate stiffness regulated myoblast proliferation and morphology independently,with nanotopographical cues showing a higher *** biophysical cues also worked synergistically,and their individual effects on cells were additive;i.e.,by comparing cells grown on different polymerbased substrates(with and without nanogrooves),the cell proliferation rate could be reduced by as much as~29%,and the elongation rate could be increased as much as~116%.Moreover,during myogenesis,muscle cells actively responded to nanotopography and consistently showed increases in fusion and maturation indices of~28%and~21%,***,under electrical stimulation,the contraction amplitude of well-aligned myotubes was found to be almost 3 times greater than that for the cells on a smooth surface,regardless of the substrate stiffness.

关键词： routine stimulation topography

Novel Scheme for Multiple Channel Pulse Generation from a Single Laser Diodefor 10 Gbit/s Based WDM Systems Using RZ Modulation Format

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光学学报 2003年第S1期23卷 373-374页

作者： H. C. Bao Y. j. wen H. F. Liu Australian Photonics Cooperative Research Centre Photonics Research Laboratory Department of Electrical & Electronic Engineering The University of Melbourne Parkville VIC 3010 Australia

A new technique for the generation of multi-channel optical pulse from a single laser diode (LD) is presented in this paper. 35 channel pulse source with 6.5 GHz repetition rate per channel and 32.5 GHz channel spacing was generated from a subharmonically hybrid mode-locked two section monolithic laser with enhanced amplitude modulation. The obtained pulse source exhibits high extinction ratio (>10 dB) and low level of root mean square (RMS) phase noise (<0.11 rad) over all channels from 1556 nm to 1565...

关键词： amplitude modulation extinction ratio channel spacing optical pulse new technique laser diode

Fabrication of all-transparent polymer-based and encapsulated nanofluidic devices using nano-indentation lithography

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Microsystems & Nanoengineering 2017年第1期3卷 373-381页

作者： Cong Wu Tiffany G.Lin Zhikun Zhan Yi Li Steve C.H.Tung William C.Tang wen j.Li Department of Mechanical and Biomedical Engineering City University of Hong KongHong Kong 999077China Department of Biomedical Engineering University of CaliforniaIrvineCA 92697-2715USA Department of Automation Yanshan UniversityQinghuangdao 066004China Department of Mechanical Engineering University of ArkansasFayettevilleAR 72701USA

In this paper,we describe a novel and simple process for the fabrication of all-transparent and encapsulated polymeric nanofluidic devices using nano-indentation ***,a nanomechanical probe is used to‘scratch’nanoscale channels on polymethylmethacrylate(PMMA)substrates with sufficiently high ***,polydimethylsiloxane(PDMS)is used twice to duplicate the nanochannels onto PDMS substrates from the‘nano-scratched’PMMA substrates.A number of experiments are conducted to explore the relationships between the nano-indentation parameters and the nanochannel dimensions and to control the aspect ratio of the fabricated *** addition,traditional photolithography combined with soft lithography is employed to fabricate microchannels on another PDMS‘cap’*** manually aligning the substrates,all uncovered channels on two separate PDMS substrates are bonded to achieve a sealed and transparent nanofluidic device,which makes the dimensional transition from microscale to nanoscale *** smallest dimensions of the achievable nanochannels that we have demonstrated thus far are of~20 nm depth and~800 nm width,with lengths extendable beyond 100μ*** flow experiments are performed to verify the reliability of the *** types of colloidal solution are used to visualize the fluid flow through the nanochannels,that is,ethanol is mixed with gold colloid or fluorescent dye(fluorescein isothiocyanate),and the flow rate and filling time of liquid in the nanochannels are estimated based on time-lapsed image *** simplicity of the fabrication process,bio-compatibility of the polymer substrates,and optical transparency of the nanochannels for flow visualization are key characteristics of this approach that will be very useful for nanofluidic and biomolecular research applications in the future.

关键词： indentation lithography nanochannel nanofluidic device nanofluidic flow

The interaction between temperature and precipitation on the potential distribution range of Betula ermanii in the alpine treeline ecotone on the Changbai Mountain

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Forest Ecosystems 2024年第1期11卷 42-51页

作者： Yu Cong Yongfeng Gu wen j.Wang Lei Wang Zhenshan Xue Yingyi Chen Yinghua jin jiawei Xu Mai-He Li Hong S.He Ming jiang Northeast Institute of Geography and Agroecology Chinese Academy of SciencesChangchun 130102China Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains Ministry of EducationSchool of Geographical SciencesNortheast Normal UniversityChangchun 130024China School of Natural Resources University of MissouriColumbiaMO 65211USA Swiss Federal Institute for Forest Snow and Landscape Research WSLCH-8903 BirmensdorfSwitzerland School of Life Science Hebei UniversityBaoding 071000China

Alpine treeline ecotones are highly sensitive to climate *** low temperature-determined alpine treeline is expected to shift upwards in response to global ***,little is known about how temperature interacts with other important factors to influence the distribution range of tree species within and beyond the alpine treeline ***,we used a GF-2 satellite image,along with bioclimatic and topographic variables,to develop an ensemble suitable habitat model based on the species distribution modeling algorithms in *** investigated the distribution of suitable habitats for *** under three climate change scenarios(i.e.,low(SSP126),moderate(SSP370)and extreme(SSP585)future emission trajectories)between two consecutive time periods(i.e.,current-2055,and 2055-2085).By 2055,the potential distribution range of *** will expand under all three climate *** medium and high suitable areas will decline under SSP370 and SSP585scenarios from 2055 to ***,under the three climate scenarios,the uppermost altitudes of low suitable habitat will rise to 2,329 m a.s.l.,while the altitudes of medium and high suitable habitats will fall to 2,201 and2,051 m *** 2085,*** promotes the expansion of *** distribution range in Changbai Mountain,and this expansion will be modified by precipitation as climate warming *** interaction between temperature and precipitation plays a significant role in shaping the potential distribution range of *** in the alpine treeline *** study reveals the link between environmental factors,habitat distribution,and species distribution in the alpine treeline ecotone,providing valuable insights into the impacts of climate change on high-elevation vegetation,and contributing to mountain biodiversity conservation and sustainable development.

关键词： Biomod2 Birch Climate change Climate scenarios Habitat suitability Range shift Treeline species

广州市星级酒店客源市场结构及其影响因素研究

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消费经济 2006年第1期22卷 75-77页

作者：文吉暨南大学管理学院旅游管理系广州石牌510632

广州是中国城市星级酒店的发源地,随着中国城市旅游市场环境的变化,星级酒店的客源市场呈现鲜明的特色。本文以一定的实证数据为基础,分析广州星级酒店客源市场结构、特点和影响因素。提出,广州星级酒店国际客源消费能力不强、国内客源... 详细信息

广州是中国城市星级酒店的发源地,随着中国城市旅游市场环境的变化,星级酒店的客源市场呈现鲜明的特色。本文以一定的实证数据为基础,分析广州星级酒店客源市场结构、特点和影响因素。提出,广州星级酒店国际客源消费能力不强、国内客源以散客为主、季节性明显,在这种条件下,只有提升广州旅游产品国际化程度,挖掘细分市场,才能进一步优化广州星级酒店的客源市场结构,提高经济效益。

关键词：广州星级酒店客源市场结构