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Journal of Integrative Agriculture 2013年第8期12卷 1357-1362页

作者： clark c K liu Department of civil and Environmental Engineering and Water Resources Research CenterUniversity of Hawaii at Manoa

Water and energy are closely linked natural resources - the transportation, treatment, and distribution of water depends on low-cost energy; while power generation requires large volumes of water. Seawater desalination is a mature technology for increasing freshwater supply, but it is essentially a trade of energy for freshwater and is not a viable solution for regions where both water and energy are in short supply. This paper discusses the development and application of a renewable-energy-driven reverse osmosis （RO） system for water desalination and the treatment and reuse of aquaculture wastewater. The system consists of （1） a wind-driven pumping subsystem, （2） a pressure-driven RO membrane desalination subsystem, and （3） a solar-driven feedback control module. The results of the pilot experiments indicated that the system, operated under wind speeds of 3 m s-~ or higher, can be used for brackish water desalination by reducing the salinity of feedwater with total dissolved solids （TDS） of over 3 000 mg L-1 to product water or permeate with a TDS of 200 mg L-~ or less. Results of the pilot experiments also indicated that the system can remove up to 97% of the nitrogenous wastes from the fish pond effluent and can recover and reuse up to 56% of the freshwater supply for fish pond operation.

关键词： renewable energy desalination pressure-driven membrane processes aquaculture fish pond

Segregation enabled outstanding combination of mechanical and corrosion properties in a FecrNi medium entropy alloy manufactured by selective laser melting

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Journal of Materials Science & Technology 2022年第4期99卷 207-214页

作者： Heng Duan Bin liu Ao Fu Junyang He Tao Yang c.T.liu Yong liu State Key Lab of Powder Metallurgy Central South UniversityChangsha 410083China Max-Planck-Institut für Eisenforschung Max-Planck-βe 1Düsseldorf 40237Germany Department of Materials Science and Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering City University of Hong KongHong KongChina

Selective laser melting(SLM)has the advantage in preparing supersaturated solid solutions due to its unique thermal field and high solidification *** this study,a face-centered cubic single-phase FecrNi medium entropy alloy(MEA)with an ultrahigh cr content(~35 at.%)was additively manufactured by *** as-built MEA shows a hierarchical microstructure of coarse columnar grains and submicron dislocation cell structures,where the cell boundaries are probed segregated with cr and c and decorated with nano *** appearance of these dislocation barriers results in an excellent combination of strength(σ_(0.2)=745 MPa,σ_(UTS)=1007 MPa)and ductility(ε_(f)=31%).The current MEA also shows a superb corrosion resistance with a corrosion current density of 0.06μA cm^(−2) in 3.5 wt.%Nacl solution,which is far lower than that of 316 *** high content of solutioned cr in the MEA ensures sufficient cr supply to form an integrated cr_(2)O_(3) passive film,and the large number of cell boundaries acting as the diffusion channels lead to the fast formation of a stable passive film over the alloy surface.

关键词： Selective laser melting Microsegregation Strength Ductility corrosion resistance

Protective actions of salvianolic acid A on hepatocyte injured by peroxidation in vitro

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World Journal of Gastroenterology 2000年第3期6卷 402-404页

作者： Hu YY liu cH Wang RP liu c liu P Zhu DY Shanghai Univ Tradit chinese Med Inst Liver Dis Shanghai 200032 Peoples R China

INTRODUcTION Salvianolic radix,one of the most commonly usedtraditional chinese herbs,was widely studied aboutits actions against liver injury and fibrosis,and wasone of the focuses of recent *** acid-A(SA-A)was an aq... 详细信息

关键词： Salvianolic acid A hepatocyte carbon tetrachloride liver injury lipid peroxidation water soluble vitamin E ALT AST superoxide dismutase malondiadehyde catalase lactase dehydrogenase glutathione peroxidase glutathione

Topological phases of a non-Hermitian coupled SSH ladder

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chinese Physics B 2019年第10期28卷 269-273页

作者： J S liu Y Z Han c S liu Hebei Key Laboratory of Microstructural Material Physics School of Science Yanshan University

We study topological phases of a non-Hermitian coupled Su-Schrieffer-Heeger(SSH) ladder. The model originates from the brick-wall lattices in the two-row limit. The Hamiltonian can be brought into block off-diagonal form and the winding number can be defined with the determine of the block off-diagonal matrix. We find the determine of the offdiagonal matrix has nothing to do with the interleg hopping of the ladder. So the topological phases of the model are the same as those of the chains. Further numerical simulations verify the analysis.

关键词： topological phase non-Hermitian Su-Schrieffer-Heeger(SSH) ladder winding number

A new way to construct topological invariants of non-Hermitian systems with the non-Hermitian skin effect

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chinese Physics B 2020年第1期29卷 119-123页

作者： J S liu Y Z Han c S liu Hebei Key Laboratory of Microstructural Material Physics School of ScienceYanshan UniversityQinhuangdao 066004China

The non-Hermitian skin effect breaks the conventional bulk–boundary correspondence and leads to non-Bloch topological *** by the fact that the topological protected zero modes are immune to perturbations,we construct a partner of a non-Hermitian system by getting rid of the non-Hermitian skin *** adjusting the imbalance hopping,we find that the existence of zero-energy boundary states still dictate the bulk topological invariants based on the band-theory *** non-Hermitian Su–Schrieffer–Heeger(SSH)models are used to illuminate the ***,we obtain the winding numbers in analytical form without the introduction of the generalized Brillouin *** work gives an alternative method to calculate the topological invariants of non-Hermitian systems.

关键词： non-Hermitian skin effect Su–Schrieffer–Heeger(SSH)model bulk–boundary correspondence topological invariant

A MODEL FOR BAINITIc TRANSFORMATION KINETIcS WITH PARABOLIc NUcLEATION RATE

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Acta Metallurgica Sinica(English Letters) 2001年第1期14卷 63-71页

作者： c.c. liu, K.F. Yao and Z liu (Department of Mechanical Engineering, Tsinghua University, Beijing 100084, china) Dept. of Mech. Eng. Tsinghua Univ. Beijing 100084 China

Based on the assumptions of parabolic variation of nucleation rate versus time and transformation kinetics depending mainly on nucleation rate, a different model for bainitic transformation kinetics in hypoeutectoid steels was established. And this model was proved to be effective in the description of bainitic transformation by comparison with the result of conventional Avrami equation.

关键词： bainitic transformation kinetics parabolic nucleation rate rapid growth

High Strain Rate Superplasticity in a Micro-grained Al-Mg-Sc Alloy with Predominant High Angle Grain Boundaries

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Journal of Materials Science & Technology 2012年第11期28卷 1025-1030页

作者： F. c. liu Z.Y. Ma F. c. Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004China

Friction stir processing （FSP） was applied to extruded AI-Mg-Sc alloy to produce fine-grained microstructure with a grain size of 2.2μm. Electron backscatter diffraction （EBSD） result showed that the grain boundary misorientation distribution was very close to a random grain assembly for randomly oriented cubes. Super- plastic investigations in the temperature range of 425-500 ℃ and strain rate range of 1x100^-2-1x10 s^-1 showed that a maximum elongation of 1500% was achieved at 475 ℃ and a high strain rate of 1x100^-2-1x10 s^-1. The FSP AI-Mg-Sc exhibited enhanced superplastic deformation kinetics compared to that predicted by the constitutive relationship for superplasticity in fine-grained aluminum alloys. The origin for enhanced superplas- tic deformation kinetics in the FSP alloy can be attributed to its high fraction of high angle grain boundaries （HAGBs）. The analyses of the superplastic data and scanning electron microscopy （SEM） examinations on the surfaces of deformed specimens indicated that grain boundary sliding is the main superplastic deformation mechanism for the FSP AI-Mg-Sc alloy.

关键词： Superplasticity Friction stir processing Aluminum Microstructure Friction stir welding

Precipitation on stacking faults in Mg–9.8wt%Sn alloy

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Journal of Materials Science & Technology 2020年第10期42卷 230-240页

作者： c.Q.liu c.He H.W.chen J.F.Nie International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing400044China Department of Materials Science and Engineering Monash UniversityVictoria3800Australia Electron Microscopy center Chongqing UniversityChongqing400044PR China

In this work,we have systematically investigated precipitation ofβ’-Mg3Sn phase on intrinsic stacking faults I1 and I2 in a Mg-9.8 wt%Sn alloy using aberration-corrected scanning transmission electron *** observed I1 faults are generated by the dissociation of c+a perfect dislocations and bounded by Frank partial dislocations having a Shockley *** ofβ’on I1 involves a shear of 1/3α,similar to its formation directly from theα-Mg ***β’phase often nucleates at one end of an I1 fault due to the interaction between shear strain fields ofβ’and the Shockley component of the Frank partial at that end,and subsequently grows towards the other end of the *** theβ’reaches to the other end,the Shockley partial bounding the lengthening end of theβ’reacts with the Frank partial bounding the fault,generating an a perfect dislocation that can glide away from the precipitate and the *** observed I2 faults are generated by the dissociation of a perfect dislocations and bounded by Shockley *** ofβ’on I2 does not need a shear of 1/3α,since the pre-existing I2 fault already provides an ABcA four-layer structure ofβ’.Thickening of theβ’that has already formed on the I2 involves the successive occurrence of three crystallographically equivalent shears of 1/3αon every second(0002)αplane of theα-Mg *** this thickening mechanism is similar to that of theβ’formed directly from theα-Mg matrix,an a perfect dislocation will be produced when theβ’is thickened to eight layers,and it can again glide away from the precipitate and the fault.

关键词： Heterogeneous precipitation HAADF-STEM Shockley partial dislocation Frank partial dislocation Dislocation reaction

How does transmembrane electrochemical potential drive the rotation of Fo motor in an ATP synthase？

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Protein & cell 2015年第11期6卷 784-791页

作者： Xuejun c. Zhang Min liu Yan Zhao National Laboratory of Macromolecules National Center of Protein Science-Beijing Institute of Biophysics Chinese Academyof Sciences Beijing 100101 China

ATP synthesis via Fi/Fo-like ATP synthases is a universal energy An essential step of this process is to Utilize the free energy of the transmembrane electrochemical potential of cations, such as protons or sodium ion... 详细信息

关键词： synthase research history filled landmark discoveries

Quantum Well Infrared Photodetectors:the Basic Design and New Research Directions

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Journal of Semiconductors 2001年第5期22卷 529-537页

作者： H.c.liu Institute for Microstructural Sciences National Research council

The basic design principles and parameters of GaAs/AlGaAs quantum well infrared photodetectors (QWIP) are *** new research directions,devices and applications suited for QWIPs are *** include monolithic integration of QWIPs with GaAs based electronic and optoelectronic devices,high frequency and high speed QWIPs and applications,multicolor and multispectral detectors,and p-type QWIPs.

关键词：光电探测器量子束红外探测器