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Search Results: 1 - 10 of 27900 matches for " Lian He "
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Elastic analysis of an elliptic notch in quasicrystals of point group 10 subjected to shear loading

Li Lian-He,

中国物理 B , 2010,
Abstract: Based on the stress potential and complex variable function method, this paper makes an elastic analysis of an elliptic notch subjected to uniform shear stress at infinity in quasicrystals with point group 10. With the aid of conformal transformation, an exact solution for the elliptic notch of the quasicrystals is obtained. The solution of the mode {\rm II} Griffith crack as a special case is constructed. The stress intensity factor and energy release rate have been also obtained as a direct result of the crack solution.
Properties of Phase Transformation of Ferroelectric Thin Films with Surface Layers  [PDF]
Lian Cui, Xu Xu, JiXin Che, Zelong He, Huijie Xue, Tianquan Lv
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.29125
Abstract: Using the generalized Ginzburg-Landau-Devonshire theory, the characteristics of phase transformation of a ferroelectric thin film with surface layers are investigated. We study the effect of the surface layer on the properties (coercive field, critical thickness) of a ferroelectric thin film. Our theoretical results show that the surface layer is likely to answer for the emergence of phase transformation.
A simulation model of the seasonal growth pattern of plant communities in the Ordos Plateau

JIANG Lian-He,

生态学报 , 2005,
Abstract: Two main factors hinder the effective incorporation of ecological information from computer models into resource management at large spatial scales: (1) some models are not based on ecologically sound principles; (2) most models based on sound principles are too sophisticated or detailed. This paper presents a generic model based on well established ecological principles with an appropriate level of detail to better server sustainable resource management decision making. The model was developed to simulate ...
Classification of snow cover days in western China and comparison with satellite remote sensing data

LiYe He,DongLiang Li,Lian Chen,

寒旱区科学 , 2012,
Long He,Lian-Mei Chen
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809045553
Abstract: There are two independent molecules in the asymmetric unit of the title compound, C15H12ClN2O2. In each molecule, the two benzene rings adopt a cis configuration with respect to the epoxy ring. The dihedral angles between the epoxy ring and chlorophenyl rings are essentially identical in the two molecules [62.50 (9) and 62.67 (9)°]. Intermolecualar N—H...O and C—H...O hydrogen bonding is present in the crystal structure.
Trimethyl 5-(2-chloro-4-fluorophenyl)-2-phenylpyrrolidine-2,3,4-tricarboxylate
Long He,Lian-Mei Chen
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809044274
Abstract: The title compound, C22H21ClFNO6, was synthesized by the 1,3-dipolar cycloaddition reaction of dimethyl maleate, methyl 2-amino-2-phenylacetate and 2-chloro-4-fluorobenzaldehyde. The pyrrolidine ring possesses an envelope conformation and the two benzene rings are oriented at a dihedral angle of 68.28 (7)°. Weak intermolecular C—H...O hydrogen bonding is present in the crystal structure. One methyl group is disordered over two positions with a site-occupancy ratio of 0.651 (12):0.349 (12).
Cloning, Expression, and Immunogenicity Analysis of the CpsE Protein from Group B Streptococcus Isolated from Tilapia (Oreochromis Niloticus)  [PDF]
Xi Fu, Kaiyu Wang, Jinlu Huang, Jun Wang, Hai Lian, Yang He, Lanmin Li, Kaiyu Wang
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.410B044

Group B Streptococcus (GBS) is a major cause of serious bacterial infection in numerous animal species. The production of capsular polysaccharide(CPs) is vital to GBS to evade host immunity. One of the genes that required for production of CPs, cpsE, has been determined to be well conserved in capsule gene cluster (cps).This study cloned the cpsE gene from Tilapia of GBS clinical isolate (serotype Ia) and expressed this gene with aid of pET-32a(+) in Escherichia coli BL21(DE3) competent cells to obtain high levels of the recombinant protein for further study about CpsE in fish and examination of its immunogenicity. The optimization of induction conditions (IPTG concentration, temperature and time) in E.coli was accomplished and let us to perform the recombinant protein induction at 37 for 3h,with 0.2mM IPTG in Luria Bertani (LB) medium. At the optimal conditions, recombinant protein was expressed in an insoluble form (inclusion bodies) and accounted for approximately 23% of the total protein. Purification by affinity chromatography yielded about 480mg fusion protein per liter culture.

Time-Frequency Analysis of Horizontal Vibration for Vehicle-Track System Based on Hilbert-Huang Transform
Zaiwei Li,Songliang Lian,Yuelei He
Advances in Mechanical Engineering , 2013, DOI: 10.1155/2013/954102
Abstract: Relationship between track alignment irregularity and car body horizontal vibration acceleration is analyzed by using Hilbert-Huang Transform (HHT). Actual measured alignment irregularity and car body horizontal vibration acceleration are decomposed by empirical mode decomposition (EMD) to obtain intrinsic mode function (IMF). By comparing IMF waveform and energy spectrum of the irregularity and vibration acceleration, there is the definitive correspondence of IMFs, and the adverse section of irregularity can be identified from car body horizontal vibration acceleration. Finally, regression analysis is taken for measured sample of track inspection car on Beijing-Guangzhou line; the quantitative relationship between track alignment irregularity and car body horizontal vibration acceleration is established with a wavelength between 1.5?m and 50?m. 1. Introduction Railroad tracks support weights of trains and help trains to run smoothly. However, operations of trains cause gradual track irregularities. Track irregularity is well known to be an important source of vibration of vehicle-track systems, where the track consists of a pair of rails supported by sleepers and ballast [1]. Therefore, it is necessary to study the vibration characteristics of such systems. Recently, a few studies have concentrated on vibration analysis of vehicle-track systems. Lian and Huang [2] used the power spectra density and coherence functions to analyze the detrimental wavelengths of the track irregularities that induce large vibration responses to passenger and freight cars. Li et al. [3] developed a real-time technique relating track geometry to vehicle performance based on the neural network approach. Weston et al. [4] described the theory and practical results of using a bogie-mounted pitchrate gyro to obtain mean track alignment. A computational model for random vibration analysis of vehicle-track systems is proposed and solutions use the pseudoexcitation method and the symplistic method by Lu et al. [1]. Luber [5] proposed a method for track geometry assessment that calculates a vehicle response prediction based on system identifications. Gao et al. [6] proposed the vehicle-track coupled dynamics theory to analysis the sensitive wavelength of track irregularity in high-speed operation. However, these studies are used spectrum analysis to dynamic response characteristics based on coupled vehicle-track systems theory, which could not quantitatively analyse relationship between track alignment irregularity and car body horizontal vibration acceleration. In this paper, we
Therapeutic Potential of FGF21 in Alzheimer’s Disease  [PDF]
Anbang Sun, Benke Xu, Xianwang Wang, Lian Liu, Yun He, Zongwen Wang, Yuncai Chen
Yangtze Medicine (YM) , 2018, DOI: 10.4236/ym.2018.21001
Abstract: Alzheimer’s disease (AD) is the most common form of dementia which mostly affects persons younger than 65 years old. Mounting findings showed that amyloid-β (Aβ) peptides, oxidative stress, neuroinflammation and insulin resistance may play central role in the pathogenesis of AD. There are very many methods to slow it through affecting these aforementioned factors. However, more efficient prevention of the progression of AD is still ambiguous. Fibroblast growth factor 21 (FGF21) is an endocrine hormone that is expressed by several organs. It increases insulin sensitivity and regulates lipid metabolism and energy homeostasis. Emerging evidence demonstrates that FGF21 has potential effects in the brain involving metabolic regulation, neuroprotection and cognition. Hence, we hypothesize that FGF21 may be a protective factor in AD by attenuating Aβ generation, inflammation, oxidative stress, and insulin resistance. Our hypothesis will shed new light on the understanding of pathogenesis of AD and help to find a new way to prevent the genesis and progress of AD.
Complete catalytic oxidation of o-xylene over CeO2 nanocubes

Lian He,Yunbo Yu,Changbin Zhang,Hong He,

环境科学学报(英文版) , 2011,
Abstract: The activities of CeO2 nanocubes calcined at di erent temperatures were tested for catalytic oxidation of o-xylene. Using CeO2 nanocubes as catalysts, complete catalytic oxidation of o-xylene was achieved below 210°C. The CeO2 nanomaterials were characterized by means of BET, X-ray di raction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). From the TEM images, all CeO2 nanocubes displayed cubic morphology irrespective of calcination temperature. The HRTEM images revealed that these nanocubes were enclosed by reactive f001g planes, which may contribute to the intrinsically catalytic property of o-xylene oxidation. The higher activity of CeO2 nanocubes calcined at 550°C than those calcined at above 550°C was attributed to their smaller crystallite size and larger surface area. The influences of reaction conditions were also studied, which found that a higher reaction temperature was necessary for complete catalytic oxidation of o-xylene at higher weight hourly space velocity (WHSV) and o-xylene concentration.
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