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Search Results: 1 - 10 of 152660 matches for " WANG Shi-ping "
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Switch effect of Bose-Einstein condensates in a triple-well potential
三势阱中玻色-爱因斯坦凝聚的开关特性

Wang Hai-Lei,Yang Shi-Ping,
王海雷
,Yang Shi-Ping

物理学报 , 2008,
Abstract: We propose a scheme utilizing mean-field approach to exhibits the switching effect in a symmetrical Bose-Einstein condensate triple-well potential. Our study shows that tunneling from the left well to the right well of a large number of atoms can be controlled by a small amount of atoms in the middle well. We also discuss the role played by the relative phase and the relation between the zero-point and the critical value of working range. The potential applications of our model are pointed out.
The dietary composition of fine wool sheep under different stocking rates and relationship between dietary diversity and plant diversity in Inner Mongolia steppe
不同放牧率下绵羊的食性及食物多样性与草地植物多样性间的关系

WANG Shi-Ping,
汪诗平

生态学报 , 2001,
Abstract: The experiment was conducted at Inner Mongolia steppe.The vegetation was dominated by Leymus chinensis,Cleistogenes squarrosa,Artemisia frigada,Potentilla acaulis. The dietary composition of Inner Mongolia fine wool sheep were analysed by the micro\|technique under different stocking rates of 1 33,4 00 and 6.67 sheep/hm\+2 in August.The results showed that the dietary composition of grazing sheep was changed with the stocking rate increase because the herbage resource was limited.The Artemisia frigi...
Simultaneous Quantification of Five Bioactive Components of Acanthopanax senticosus and Its Extract by Ultra Performance Liquid Chromatography with Electrospray Ionization Time-of-Flight Mass Spectrometry
Shi-Ping Liu,Jing-Tao An,Rui Wang,Qiang Li
Molecules , 2012, DOI: 10.3390/molecules17077903
Abstract: A simple and reliable ultra performance liquid chromatography coupled with electrospray ionization time-of-flight mass spectrometry method (UPLC-TOF-MS) was developed and validated for the simultaneous determination of the major bioactive constituents in Acanthopanax senticosus and its extract. The separation of five compounds was performed on a UPLCTM HSS T3 column (100 mm × 2.1 mm, 1.7 μm) with gradient elution using a mobile phase consisting of 0.1% aqueous formic acid and acetonitrile containing 0.1% formic acid. All targeted compounds (syringin, chlorogenid acid, caffeic acid, eleutheroside E and isofraxidin) were baseline separated within 5.3 min in samples, which represented an approximate six-fold reduction in the analysis time in comparison to published HPLC method. Quantitation was carried out working in the V mode using the narrow widow extracted ion chromatograms (nwXICs) of each compound (extracted using a 20 mDa window). Furthermore, all calibration curves showed good linearity (r > 0.999) within the test ranges. The precision was evaluated by intra- and inter-day tests, which revealed relative standard deviation (RSD) values of less than 3.88%. The recoveries for the quantified compounds were between 96.3% and 103.7%, with RSD values below 2.89%. According to the literature, this study represents the first investigation of the simultaneous analysis of multiple components and the method can be applied to determine the amounts of the major compounds in Acanthopanax senticosus and its extract by UPLC-TOF-MS.
Responses of the anatomical characteristics of plant leaf to long-term grazing under different stocking rates in Inner Mongolia steppe
不同放牧率对内蒙古典型草原植物叶片解剖结构的影响

ZHAO Xue-Yan,WANG Shi-Ping,
赵雪艳
,汪诗平

生态学报 , 2009,
Abstract: 以内蒙古草原生态系统定位研究站15a长期放牧样地的7种主要植物(扁蓿豆、冰草、糙隐子草、冷蒿、小叶锦鸡儿、星毛委陵菜、羊草)为材料,通过对不同放牧率(无牧、轻牧、中牧、重牧)下植物叶片解剖结构(角质层厚度、表皮细胞面积、叶肉细胞面积、栅栏/海绵组织厚度、叶片厚度、中脉厚度)特征以及化学成分变化的研究,探讨不同植物对长期放牧的适应策略,从而为典型草原放牧演替规律提供理论依据.结果表明:总体上,植物角质层厚度随放牧率的增加而增加;而表皮细胞面积、叶肉细胞面积、叶片厚度等指标不同植物的反应不同.植物叶片化学成分(全N、全C、纤维素含量、叶绿素a+b及a/b)随放牧率的变化较小.放牧率对冰草、冷蒿、羊草的全C、全N、叶绿素和纤维素含量均没有显著影响(P>0.05),但却显著降低了糙隐子草的比叶面积及星毛委陵菜和小叶锦鸡儿的叶绿素含量,提高了糙隐子草的纤维素含量及扁蓿豆叶片的全N含量(P<0.05).因此,不同植物对放牧的反应存在着明显的种间差异,其中植物角质层厚度、表皮细胞面积、叶片厚度和中脉厚度是植物对放牧响应最为敏感的指标.
A Study on Contact Stress of Packer Slip
封隔器卡瓦接触应力研究

WANG Di,HE Shi-ping,ZHANG Xi,
王迪
,何世平,张熹

实验力学 , 2006,
Abstract: The slips in the packer is for supporting packer and for locking rubber after anchoring.The capability of the slips influences directly on oil well yield and productive safety.Distribution of occlusive force between slip and sleeve is a key for success of packer in engineering application.The rational distribution of occlusive force is related to the damage level of sleeve and lifespan of slip.In this article,the finite-element method and 3-D photoelastic technique were both performed to analyze the contact stress of the packer slip.The formation of the experimental model,experimental procedure,the formation of calculation model and the consideration of boundary conditions were presented.The numerical results were compared with the experiment data of 3-D photoelastic model and the induced error is analyzed.The results of experimental stress analysis offer important assurance for construction of finite element model and confirmation of boundary conditions.Some important results are gained from present study and some correlative parameters are provided for optimum design of the packer slip.
The periodic solutions of a delayed sea-air oscillator coupling model for the ENSO
厄尔尼诺-南方涛动时滞海气振子耦合模型的周期解

Wang Wen,Xu Yan,Lu Shi-Ping,
王雯
,徐燕,鲁世平

物理学报 , 2011,
Abstract: Using Mawhin's continuation theorem, the existence of periodic solutions for a class of nonlinear problem are first discussed, and then by using it, the problem of periodic solutions for a delayed sea-air oscillator coupling model for the ENSO is investigated. A new result on the existence of periodic solutions to the model is obtained.
Structural and Dynamic Properties of Amorphous Silicon: Tight-Binding Molecular Dynamics Simulation
Structural and Dynamic Properties of Amorphous Silicon: Tight-Binding Molecular Dynamics Simulation

HUANG Shi-Ping,WANG Wen-Chuan,
黄世萍
,汪文川

中国物理快报 , 2004,
Abstract: The tight-binding molecular dynamics simulation has been performed to study structural and dynamical properties of amorphous silicon. It is found that the radial distribution function and static structure factor are in good agreement with the experimental measurements. The bond order parameters Ql are sensitive to the structure change at different quenching rates. For the dynamical properties, we have calculated the vibration and electronic density of states. The simulation results show that the transverse acoustic is in good agreement with the experimental data, and the high frequency transverse optical (TO) peak shifts to the right of the experimental TO peak.
Osteopontin expression is associated with hepatopathologic changes in Schistosoma japonicum infected mice
Bo-Lin Chen,Gui-Ying Zhang,Wei-Jian Yuan,Shi-Ping Wang
World Journal of Gastroenterology , 2011, DOI: 10.3748/wjg.v17.i46.5075
Abstract: AIM: To investigate osteopontin expression and its association with hepatopathologic changes in BALB/C mice infected with Schistosoma japonicum. METHODS: The schistosomal hepatopathologic mouse model was established by abdominal infection with schistosomal cercaria. Liver samples were obtained from mice sacrificed at 6, 8, 10, 14, and 18 wk after infection. Liver histopathological changes were observed with hematoxylin-eosin and Masson trichrome staining. The expression of osteopontin was determined with immunohistochemistry, reverse transcription-polymerase chain reaction, and Western blotting. The expression of α-smooth muscle actin (α-SMA) and transforming growth factor-β1 (TGF-β1) were determined by immunohistochemistry. Correlations of osteopontin expression with other variables (α-SMA, TGF-β1, hepatopathologic features including granuloma formation and degree of liver fibrosis) were analyzed. RESULTS: Typical schistosomal hepatopathologic changes were induced in the animals. Dynamic changes in the expression of osteopontin were observed at week 6. The expression increased, peaked at week 10 (P < 0.01), and then gradually decreased. Positive correlations between osteopontin expression and α-SMA (r = 0.720, P < 0.01), TGF-β1 (r = 0.905, P < 0.01), granuloma formation (r = 0.875, P < 0.01), and degree of liver fibrosis (r = 0.858, P < 0.01) were also observed. CONCLUSION: Osteopontin may play an important role in schistosomal hepatopathology and may promote granuloma formation and liver fibrosis through an unexplored mechanism.
Elimination of spiral waves and spatiotemporal chaos by the pulse with a specific spatiotemporal configuration

Yuan Guo-Yong,Yang Shi-Ping,Wang Guang-Rui,Chen Shi-Gang,

中国物理 B , 2008,
Abstract: Spiral waves and spatiotemporal chaos are sometimes harmful and should be controlled. In this paper spiral waves and spatiotemporal chaos are successfully eliminated by the pulse with a very specific spatiotemporal configuration. The excited position D of spiral waves or spatiotemporal chaos is first recorded at an arbitrary time (t0). When the system at the domain D enters a recovering state, the external pulse is injected into the domain. If the intensity and the working time of the pulse are appropriate, spiral waves and spatiotemporal chaos can finally be eliminated because counter-directional waves can be generated by the pulse. There are two advantages in the method. One is that the tip can be quickly eliminated together with the body of spiral wave, and the other is that the injected pulse may be weak and the duration can be very short so that the original system is nearly not affected, which is important for practical applications.
GINZBURG-LANDAU THEORY AND VORTEX LATTICE OF HIGH-TEMPERATURE SUPERCONDUCTORS

Zhou Shi-ping,

中国物理 B , 2001,
Abstract: The thermodynamics of the vortex lattice of high-temperature superconductors has been studied by solving the generalized Ginzburg-Landau equations derived microscopically. Our numerical simulation indicates that the structure of the vortex lattice is oblique at the temperature far away from the transition temperature Tc, where the mixed s-dx2-y2 state is expected to have the lowest energy. Whereas, very close to Tc, the dx2-y2 wave is slightly lower energetically, and a triangular vortex lattice recovers. The coexistence and the coupling between the s and d waves would account for the unusual dynamic behaviours such as the upward curvature of the upper critical field curve HC2(T), as observed in dc magnetization measurements on single-crystal YBa2Cu3O7 samples.
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