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Search Results: 1 - 10 of 93474 matches for " Ji Liu "
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First-Principle Studies on the Ga and As Doping of Germanane Monolayer  [PDF]
Lei Liu, Yanju Ji, Yifan Liu, Liqiang Liu
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.71005
Abstract: The study of energetics, structural, the electronic and optical properties of Ga and As atoms substituted for doped germanane monolayers were studied by first-principles calculations based on density functional theory. Both of the two doping are thermodynamically stable. According to the band structure and partial density of the states, gallium is p-type doping. Impurity bands below the conduction band lead the absorption spectrum moves in the infrared direction. Arsenic doping has impurity level passing through the Fermi level and is n-type doping. The analysis of optical properties confirms the value of bandgap and doping properties.
The Study of 1 + X Evaluation Mode Reform  [PDF]
Tian Zhang, Man Liu, Qiang Ji
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.516163
Abstract: To solve the question of the present situation of professional education, we analyze the outstanding problems of the process, and put forward the design of content, the main measures of reform and the relationship that should be handled in the process of 1 + X evaluation mode reform, in order to adapt to the reform of the professional education, and build a scientific and reasonable system of 1 + X evaluation mode. Accordingly, we can improve the quality of teaching and talent training.
Patterns and Pricing of Idiosyncratic Volatility in the French Stock Market  [PDF]
Zhentao Liu, Gilbert V. Nartea, Ji Wu
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.81005
Abstract: We investigate the time series behavior of idiosyncratic volatility and its role in asset pricing in France. We find that both aggregate idiosyncratic and market volatility exhibit regime switching behavior similar to that in the U.S. and other developed countries. Furthermore, we find a marginally significant negative IVOL effect in the French stock market. We add new evidence to the mounting results questioning the ubiquity of the IVOL effect which highlights the importance of country verification of so called anomalies in the US, even in developed markets.
Simultaneous determination of chlorogenic acid and baicalin in heat-clearing and detoxicating oral liquid by NIRS  [PDF]
Zhen-Yao Liu, Bing Liu, Ji-Dong Yang
Health (Health) , 2009, DOI: 10.4236/health.2009.13022
Abstract: The calibration model for simultaneous deter-mination of chlorogenic acid and baicalin in heat-clearing and detoxicating oral liquid was built by partial least squares and near infrared spectroscopy, and the method of spectral pre-treatment was discussed. Building model from calibration set obtained good results, and vali-dated by prediction. According to heat-clearing and detoxicating oral liquid from 30 batches of 6 factories, the correlation coefficient of chloro-genic acid and baicalin model are 0.9993 and 0.9923, The root mean square error of cross validation (RMSECV) are 0.467 and 0.480, and the standard Error of prediction (SEP) of chloro- genic acid and baicalin are 0.356 and 0.370 re-spectively. The correlation coefficients in pre-diction set are 0.9997 and 0.9969, prediction results are accurate and reliable. This method can be applied in rapid analysis of heat- clearing and detoxicating oral liquid, and it is fit for on-line detection and has a wide application prospect.
Effect of Ice-Temperature and Spermidine on Chilling Sensitivity of Pepper  [PDF]
Dongjie Liu, Guoliang Sui, Yongzhou He, Wen Qin, Ji Liu
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.42022
Abstract:

The peppers which were treated at ice-temperature for 6 hours and 1 mmol/L spermidine for 10 min, followed by cold storage (4 ± 1) respectively were investigated. The results indicated that the chilling injury was delayed and reduced by ice-temperature and spermidine treatments. Comparing with control group, ice-temperature and spermidine exerted significant effects on reduction of ascorbic acid (Vc) and chlororphyll contents, relatively high activity of superoxide dismutase (SOD), accumulation of malondialdehyde (MDA) as well as the increase of cell membrane penetrability. The results indicated that the spermidine and ice-temperature induced the activity of antioxidant enzyme SOD and maintained higher defence-related compound Vc as well as lower levels of membrane lipid peroxidation, which may be associated with chilling injury alleviation. There was a difference between ice-temperature treatment and spermidine treatment after 30 days. The results suggested that spermidine was more effective in reducing chilling sensitivity and prolonging storage of peppers.

Polyethism in Termites  [PDF]
Ehsan Soleymaninejadian, Zhongji Bao, Shuwen Liu, Shilin Ji, Jiajia Liu
Advances in Entomology (AE) , 2014, DOI: 10.4236/ae.2014.23020
Abstract: Polyethism or division of works among workers of social insects is always a hot issue among entomologists. Honey bees, ants, and wasps are the main target for scientists to study the division of works. Studying polyethism in termites has been increased recently due to the damages to the forests, buildings, boats and even water preserving monuments. Every year a huge amount of money is spent to control these isopteran social insects in the south east of Asia, the US, Australia and other tropical and subtropical regions. As understanding the polyethism in these social insects can be a hand in controlling them, in this review we have tried to explain different kinds of polyethism and their importance in these social insects.
Treatment of non-alcoholic fatty liver disease based on traditional Chinese medicine therapies for warming yang to activate qi
Tao Liu,Guang Ji
Zhong Xi Yi Jie He Xue Bao , 2011,
Abstract: : Fatty liver disease is caused by abnormal accumulation of lipids within hepatocytes. According to traditional Chinese medicine (TCM) theory, lipids belong to the category of essence obtained from cereals and the normal distribution of essence relies on the function of spleen yang. When spleen yang is injured, the normal distribution of essence (lipids) will be affected, leading to formation of phlegm retention in the liver. That is the TCM pathogenesis of fatty liver disease. Hence the treatment of fatty liver disease should be concentrated on warming yang to activate qi. With such a treatment, the normal distribution of essence will be restored, essence will be distributed, and phlegm will be dissipated.
A Mathematical Characterization for Patterns of a Keller-Segel Model with a Cubic Source Term
Shengmao Fu,Ji Liu
Advances in Mathematical Physics , 2013, DOI: 10.1155/2013/934745
Abstract: This paper deals with a Neumann boundary value problem for a Keller-Segel model with a cubic source term in a d-dimensional box , which describes the movement of cells in response to the presence of a chemical signal substance. It is proved that, given any general perturbation of magnitude δ, its nonlinear evolution is dominated by the corresponding linear dynamics along a finite number of fixed fastest growing modes, over a time period of the order ln( ). Each initial perturbation certainly can behave drastically differently from another, which gives rise to the richness of patterns. Our results provide a mathematical description for early pattern formation in the model. 1. Introduction Keller and Segel in their pioneering work [1] proposed the following model where is cell density, is chemoattractant concentration, is the amoeboid motility, is the chemotactic sensitivity, is the diffusion rate of cyclic adenosine monophosphate (cAMP), is the rate of cAMP secretion per unit density of amoebae, and is the rate of degradation of cAMP in environment. Keller and Segel wanted to model the chemotactic movement of the cellular slime mold Dictyostelium discoideum during its aggregation phase, where population growth does not occur. Therefore, they considered a population in the absence of “death” and “birth.” For some main results on the Keller-Segel model, please see [2–4] and references therein. Recently, Guo and Hwang in [5] investigated the nonlinear dynamics near an unstable constant equilibrium of the Keller-Segel model satisfying the Neumann boundary conditions for and on a -dimensional box ; that is, Let be the uniform constant solution of the Keller-Segel model, and . Then satisfies the equivalent Keller-Segel system below: Guo and Hwang proved that linear fastest growing modes determine unstable patterns for the above system. Their result can be interpreted as a rigorous mathematical characterization for early pattern formation in the Keller-Segel model. In recent years, more and more attention has been given to the Keller-Segel model with the reaction terms, that is, the following chemotaxis-diffusion-growth model: For , Painter and Hillen [6] demonstrated the capacity of the above model to self-organize into multiple cellular aggregations which, according to its position in parameter space, either form a stationary pattern or undergo a sustained spatiotemporal sequence of merging (two aggregations coalesce) and emerging (a new aggregation appears). This spatiotemporal patterning can be further subdivided into either a time-periodic or
Fulde-Ferrell pairing instability of a Rashba spin-orbit coupled Fermi gas
Xia-Ji Liu
Physics , 2013, DOI: 10.1103/PhysRevA.88.043607
Abstract: We theoretically analyze the pairing instability of a three-dimensional ultracold atomic Fermi gas towards a Fulde-Ferrell superfluid, in the presence of Rashba spin-orbit coupling and in-plane Zeeman field. We use the standard Thouless criterion for the onset of superfluidity, with which the effect of pair fluctuations is partially taken into account by approximately using a mean-field chemical potential at zero temperature. This gives rise to an improved prediction of the superfluid transition temperature beyond mean-field, particularly in the strong-coupling unitary limit. We also investigate the pairing instability with increasing Rashba spin-orbit coupling, along the crossover from a Bardeen-Cooper-Schrieffer superfluid to a Bose-Einstein condensate of Rashbons (i.e., the tightly bound state of two fermions formed by strong Rashba spin-orbit coupling
Soliton-induced Majorana fermions in a one-dimensional atomic topological superfluid
Xia-Ji Liu
Physics , 2015, DOI: 10.1103/PhysRevA.91.023610
Abstract: We theoretically investigate the behavior of dark solitons in a one-dimensional spin-orbit coupled atomic Fermi gas in harmonic traps, by solving self-consistently the Bogoliubov-de Gennes equations. The dark soliton - to be created by phase-imprinting in future experiments - is characterized by a real order parameter, which changes sign at a point node and hosts localized Andreev bound states near the node. By considering both cases of a single soliton and of multiple solitons, we find that the energy of these bound states decreases to zero, when the system is tuned to enter the topological superfluid phase by increasing an external Zeeman field. As a result, two Majorana fermions emerge in the vicinity of each soliton, in addition to the well-known Majorana fermions at the trap edges associated with the nontrivial topology of the superfluid. We propose that the soliton-induced Majorana fermions can be directly observed by using spatially-resolved radio-frequency spectroscopy or indirectly probed by measuring the density profile at the point node. For the latter, the deep minimum in the density profile will disappear due to the occupation of the soliton-induced zero-energy Majorana fermion modes. Our prediction could be tested in a resonantly-interacting spin-orbit coupled $^{40}$K Fermi gas confined in a two-dimensional optical lattice.
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