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Search Results: 1 - 10 of 124378 matches for " Fa-Zuo Wang "
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A New Triterpenoid Saponin from Abrus precatorius Linn
Zhi-Hui Xiao,Fa-Zuo Wang,Ai-Jun Sun,Chuan-Rong Li,Cai-Guo Huang,Si Zhang
Molecules , 2012, DOI: 10.3390/molecules17010295
Abstract: A new triterpenoid saponin, 3-O-β-D-glucopyranosyl-(1→2)-β-D-glucopyranosyl subprogenin D (1), together with six known triterpenoids: subprogenin D (2), abrusgenic acid (3), triptotriterpenic acid B (4), abruslactone A (5), abrusogenin (6) and abrusoside C (7) were isolated from the leaves and stems of Abrus precatorius. Their structures were elucidated on the basis of physical and NMR analysis, respectively. Compounds 5 and 6 showed moderate cytotoxicity against MCF-7, SW1990, Hela, and Du-145 cell lines. Compounds 1, 2 and 4 were isolated from this plant for the first time.
An Intelligent Multi-Port Memory
Wang Zuo
Journal of Computers , 2010, DOI: 10.4304/jcp.5.3.471-478
Abstract: It has become clear that on-chip storage is critical in large FPGAs. Scholars have done some researches on implementing user logic memory models with single-port and dual-port physical arrays. Their work is based on the assumption that user memory models are either single-port or dual-port. However, their works may not be helpful to multi-processor applications since single or dual-port arrays may not satisfy the simultaneous accesses from different processors. This paper proposes a novel multi-port memory design. In our design, distributed memory resources of LUT are mapped as 1-port memory banks. Data in different memory banks can be accessed simultaneously. With the help of port-priority and r/w-priority, our multi-port memory can resolve both write-write conflict and read-write conflict. When write-write conflict occurs, the port with the highest priority can execute its write operation. When
Schwinger Boson Mean Field Theories of Spin Liquid States on Honeycomb Lattice: Projective Symmetry Group Analysis and Critical Field Theory
Fa Wang
Physics , 2010, DOI: 10.1103/PhysRevB.82.024419
Abstract: Motivated by the recent numerical evidence[1] of a short-range resonating valence bond state in the honeycomb lattice Hubbard model, we consider Schwinger boson mean field theories of possible spin liquid states on honeycomb lattice. From general stability considerations the possible spin liquids will have gapped spinons coupled to Z$_2$ gauge field. We apply the projective symmetry group(PSG) method to classify possible Z$_2$ spin liquid states within this formalism on honeycomb lattice. It is found that there are only two relevant Z$_2$ states, differed by the value of gauge flux, zero or $\pi$, in the elementary hexagon. The zero-flux state is a promising candidate for the observed spin liquid and continuous phase transition into commensurate N\'eel order. We also derive the critical field theory for this transition, which is the well-studied O(4) invariant theory[2-4], and has an irrelevant coupling between Higgs and boson fields with cubic power of spatial derivatives as required by lattice symmetry. This is in sharp contrast to the conventional theory[5], where such transition generically leads to non-colinear incommensurate magnetic order. In this scenario the Z$_2$ spin liquid could be close to a tricritical point. Soft boson modes will exist at seven different wave vectors. This will show up as low frequency dynamical spin susceptibility peaks not only at the $\Gamma$ point (the N\'eel order wave vector) but also at Brillouin zone edge center $M$ points and twelve other points. Some simple properties of the $\pi$-flux state are studies as well. Symmetry allowed further neighbor mean field ansatz are derived in Appendix which can be used in future theoretical works along this direction.
Realization of the Exactly Solvable Kitaev Honeycomb Lattice Model in a Spin Rotation Invariant System
Fa Wang
Physics , 2010, DOI: 10.1103/PhysRevB.81.184416
Abstract: The exactly solvable Kitaev honeycomb lattice model is realized as the low energy effect Hamiltonian of a spin-1/2 model with spin rotation and time-reversal symmetry. The mapping to low energy effective Hamiltonian is exact, without truncation errors in traditional perturbation series expansions. This model consists of a honeycomb lattice of clusters of four spin-1/2 moments, and contains short-range interactions up to six-spin(or eight-spin) terms. The spin in the Kitaev model is represented not as these spin-1/2 moments, but as pseudo-spin of the two-dimensional spin singlet sector of the four antiferromagnetically coupled spin-1/2 moments within each cluster. Spin correlations in the Kitaev model are mapped to dimer correlations or spin-chirality correlations in this model. This exact construction is quite general and can be used to make other interesting spin-1/2 models from spin rotation invariant Hamiltonians. We discuss two possible routes to generate the high order spin interactions from more natural couplings, which involves perturbative expansions thus breaks the exact mapping, although in a controlled manner.
Mercury Emission Characteristics from Coal-Fired Power Plants Based on Actual Measurement
基于实测的燃煤电厂汞排放特性分析与研究

WANG Sheng,WANG Hui-min,ZHU Fa-hua,CHEN Hui,SUN Xue-li,ZUO Yi,LIU Gang,
王圣
,王慧敏,朱法华,陈辉,孙雪丽,左漪,刘钢

环境科学 , 2011,
Abstract: 选取我国6个有代表性的燃煤电厂进行现场实测,依据现场监测的汞排放浓度数据计算得出每个燃煤电厂汞的脱除率和汞平均排放因子,从而得出这6个燃煤电厂汞排放特性,为将来我国汞排放控制提供支持和依据.6个燃煤电厂的汞排放浓度为4.72~14.54μg/m3,汞脱除效率为20.89%~70.63%,汞排放因子为14.09~56.08μg/(kW.h).将6个燃煤电厂汞的排放特性与美国燃煤电厂汞的排放特性比较,得到烟气中汞的排放浓度远大于美国的排放浓度,汞脱除率远小于美国国家标准所要求的脱除率.分析得到汞平均排放因子随装机规模、发电负荷增大呈变小的趋势,通过综合模拟给出燃煤电厂汞平均排放因子和机组装机容量、发电负荷、煤中含汞量、除尘、脱硫设备运行水平等因子的函数关系.
Optimized digital micro-holographic imaging system
优化的数字全息显微成像系统

Wang Hua-Ying,Liu Fei-Fei,Liao Wei,Song Xiu-Fa,Yu Meng-Jie,Liu Zuo-Qiang,
王华英
,刘飞飞,廖薇,宋修法,于梦杰,刘佐强

物理学报 , 2013,
Abstract: Based on the analysis of the recording and reconstructing of hologram and the point spread function of pre-magnification digital micro-holographic system (PMDMHS), the performances of the six common PMDMHSs are compared in imaging resolution, imaging quality and conveniences, for the first time to our knowledge. The results show that the digital image-plane holography (DIPH) has the highest imaging resolution and the best imaging quality; the resolution of DIPH is independent of the photosensitive surface size of the recording device; this system can completely record the information about the object transmitted through the micro-objective (MO); it is not needed to consider the size of illuminated region of object. Moreover, the reconstruction process of DIPH is very simple. DIPH is an optimized digital holographic imaging system. The DIPH with equal curvature of reference wavefront and object wavefront is very conducive to phase unwrapping and phase aberration compensation; therefore DIPH is more suitable for phase microscopy. The experimental results demonstrate the validation of the theoretical analysis.
Adsorption performance of CMC polymer for heavy metal ions
CMC聚合物对重金属离子的吸附性能

LIU Zuo-Xin,QU Wei,MIAO Yong-Gang,WANG Zhen-Ying,YIN Guang-Hua,ZHANG Fa-Sheng,
刘作新
,曲威,苗永刚,王振营,尹光华,张法升

中国科学院研究生院学报 , 2009,
Abstract: 通过正交试验得出制备羧甲基纤维素(CMC)聚合物的最佳工艺条件:丙烯酸(AA)/羧甲基纤维素=10,引发剂(硫酸铵)和交联剂(N,N′-亚甲基双丙烯酰胺)用量分别为单体的0.0014倍和0.0015倍.吸胀平衡后,将CMC聚合物在400~450℃下完全灰化16h,消解并用火焰原子吸收法测定聚合物对Zn2+、Cu2+、Pb2+、Cd2+、Cr2+、Ni2+和Mn2+的吸附性能.结果表明,CMC聚合物对重金属离子具有一定的吸附能力,其吸附量随着溶液pH值和重金属离子质量浓度的增加而增大,当pH为9时达到最大;并且CMC聚合物对Pb2+和Cu2+的吸附量要大于其他金属离子.
Separation of acid compounds for refining biomass pyrolysis oil
生物油酸性组分分离精制研究

GUO Zuo-gang,WANG Shu-rong,ZHU Ying-ying,LUO Zhong-yang,CEN Ke-fa,
郭祚刚
,王树荣,朱颖颖,骆仲泱,岑可法

燃料化学学报 , 2009,
Abstract: 生物油因水分含量高和呈酸性未能作为高品位能源直接规模化应用.利用分子蒸馏技术将生物油水分与酸性组分作为整体对象进行分离,既得到生物油酸性组分富集馏分,又获得了水分含量低、酸性较弱与热值较高的精制生物油Ⅰ(蒸馏重质馏分)与精制生物油Ⅱ(常温冷凝馏分).同时,具体考察了精制前后生物油的pH值、热值和水分等参数的变化规律.研究表明,生物油的水分与酸性组分得到有效分离,精制生物油Ⅰ和Ⅱ的低级羧酸含量从原始生物油的18.85%分别降低至0.96%和2.2%
Birthseasonalityandpatterninblack-and-whitesnub-nosedmonkeys(Rhinopithecusbieti)atMt.Lasha,Yunnan
Jin-Fa LI,Yu-Chao HE,Zhi-Pang HUANG,Shuang-Jin WANG,Zuo-Fu XIANG,Juan-Jun ZHAO,Wen XIAO,Liang-Wei CUI
动物学研究 , 2014, DOI: 10.13918/j.issn.2095-8137.2014.6.474
Abstract: Seasonalvariationinenvironmentalfactorsisvitaltotheregulationofseasonalreproductioninprimates.Consequently,long-termsystematicdataisnecessarytoclarifythebirthseasonalityandpatternofprimatesinhighlyseasonalenvironments.Thisstudyindicatedthatblack-and-whitesnub-nosedmonkeys(Rhinopithecusbieti)atMt.Lashaexhibitedstrictbirthseasonalitywithapulsemodel.Infantswerebornwithacertaindegreeofsynchronization.Birthdistributionshowedthreebirthpeaks,andthebirthpatternshoweda“V”styleineven-numberedyearsandagradualincreaseinodd-numberedyears.Thebeginningdate,enddateandmedianbirthdatewereearlierineven-numberedyearsthanthoseinodd-numberedyears.Thehigherlatitudeoftheirhabitats,earlierbirthdate,shorterbirthperiod,fewerbirthpeaksandstrongerbirthsynchronymightbeadaptationsforstronglyseasonalvariationinclimateandfoodresources.Afterthesummersolsticewhendaylightlengthbegantograduallyshorten,R.bietiatMt.Lashastartedtobreedduringtheperiodwiththehighestenvironmentaltemperatureandfoodavailability,whichimpliedthatphotoperiodmaybetheproximatefactortriggeringtheonsetofestrusandmating.ItappearsthatR.bieticoincidedconceptionandmid-lactationwiththepeakinstaplefoods,andweaningwiththepeakinhighqualityoffoods.Thus,foodavailabilitywastheultimatefactorregulatingreproductiveseasonality,andphotoperiodwastheproximatefactorfine-turningthecoordinationbetweenseasonalbreedingandfoodavailability.
Research on the Relationship among Government Regulations, Strategy Preference and Manufacturing Performance  [PDF]
Fa-Xin Cheng, Wei Wang
Journal of Service Science and Management (JSSM) , 2012, DOI: 10.4236/jssm.2012.51005
Abstract: Based on the environment-strategy-performance paradigm, the paper constructs a theoretical framework on the rela- tionship among government regulations, manufacturing strategy and performance. Using structural equation model and a sample of 135 SME of Jiangsu Province, this paper examines the relationship among government regulations, manu- facturing strategy and performance, the result of which shows that government regulations have a significant positive effect on cost, quality and innovation; cost, quality and innovation influence financial performance significantly and positively; quality and innovation have a significant positive effect on non-financial performance, whereas cost has not. Finally, suggestions for SME-development promoting policy and manufacturing strategy selection are putting forward.
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