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Search Results: 1 - 10 of 47176 matches for " Qin Yan "
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Empirical Study on the Impact of Domestic Economic Cycle on Sichuan’s Tourism  [PDF]
Junrong Liu, Qin Yan
Journal of Service Science and Management (JSSM) , 2012, DOI: 10.4236/jssm.2012.53034
Abstract: This article empirically enquires, from the perspective of demand, the impact of economic cyclical fluctuation on Sichuan tourism. The findings show that Sichuan tourism demand proves elastic to CPI, Sichuan’s GNI capita and interest rate, and that CPI and interest rate fluctuations are negatively correlated with Sichuan domestic tourism demand, while, with which Sichuan’s GNI capita is positively associated. The study also finds that per capita national income and the local consumer price index enjoy strong predictive power for Sichuan tourism.
Histone Ubiquitination and Deubiquitination in Transcription, DNA Damage Response, and Cancer
Qin Yan
Frontiers in Oncology , 2012, DOI: 10.3389/fonc.2012.00026
Abstract: Histone post-transcriptional modifications play essential roles in regulation of all DNA related processes. Among them, histone ubiquitination has been discovered for more than three decades. However, its functions are still less well understood than other histone modifications such as methylation and acetylation. In this review, we will summarize our current understanding of histone ubiquitination and deubiquitination. In particular, we will focus on how they are regulated by histone ubiquitin ligases and deubiquitinating enzymes. We will then discuss the roles of histone ubiquitination in transcription and DNA damage response and the crosstalk between histone ubiquitination and other histone modifications. Finally, we will review the important roles of histone ubiquitination in stem cell biology and cancer.
Research on Gift Alienability from Anthropology Perspective
Yan Liu,Yanbin Qin
Asian Social Science , 2009, DOI: 10.5539/ass.v5n10p147
Abstract: Economics is usually elaborate economic phenomena from an objective point of view. While Anthropologist is more related with the social and culture field, to describe the sequential change of the particular economic action and bring it to a particular social structure. As a social behavior, the characteristics of economic activity have notable humanism particularity. The economic study includes not only the data collection or logic calculation, though the universal law exists for the base of academic conjecture. The economic phenomenon also receives influence from integrated factors, full of uncertainty as other human activity. Only if we take the social and cultural background and personal experience into our consideration, the conventional and exceptional economic phenomenon might be more recognizable. The mutual influence between culture and economy will be examined. Culture has its significant impact on economic activity, and in certain condition, culture or immaterial ideology would become commodity itself. It is inaccessible to interpret these phenomenon by stereotype the classical economic rule mechanically. Besides the traditional practical value, emotional value should also be taken into account. The explanation of economic phenomena would be more thoroughly with the Anthropology perspective involved.
Application of Fuzzy Comprehensive Evaluation on COGAG Power Plant of Performance  [PDF]
Menglin Shao, Qianchao Liang, Dong Yan, Heng Qin, Jun Xiang
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.29005
Abstract:

A fuzzy comprehensive evaluation of COGAG power plant performance is given by using a method of fuzzy mathematics, and multilevel fuzzy evaluation model is set up. Taking a naval ship as an example, the major parameters related to COGAG power plant performance are obtained by computer simulation, and a set of synthetic performance evaluation index system is established. The result shows that the strong fuzzy propulsion system performance indexes can be quantified by this fuzzy evaluation model in order to provide the reference for choosing the optimal design of ship propulsion system.

Methods Development for the Optical Determination of the Black Carbon Content of Loess Samples  [PDF]
Yan Mu, Xiaoguang Qin, Jiaqi Liu, Zhiqiang Yin
American Journal of Analytical Chemistry (AJAC) , 2015, DOI: 10.4236/ajac.2015.67057
Abstract: We evaluate the applicability of an optical transmission measurement method commonly used for the analysis of the Black Carbon (BC) content of aerosol sample, to determine the BC content of loess sediments. A number of different sample pretreatment procedures are developed and compared, leading to an optimum preparation process. The results include: 1) Subtraction of the optical attenuation values before and after heating of the sample filters (“ΔATN) varies linearly with the sample mass. The slope of the regression line provides the best determination of BC concentration. 2) When the sample mass is small, (NaPO3)6 pretreatment is best for BC measurement, and the BC concentration results are given by the slope of the regression between ΔATN and sample mass, for a series of samples of varying mass. 3) HF pretreatment accompanied by centrifugation and rinsing may produce a negative bias on the result. 4) Replicate measurements of BC for loess samples showed a maximum deviation less than 5.6%, suggesting that measurements of the BC concentration of a sequence of loess samples could determine variations to this degree of significance. 5) The overall trends of BC concentration in loess section sequences were similar for all chemical pretreatments. The BC concentration result for replicate samples is comparable when pretreated by the same procedure.
SURFACE-ENHANCED RAMAN SCATTERING STUDY ON NON-ACTIVITY OF Ag-Cl CLUSTERS

FANG YAN,LI QIN,

中国物理 B , 1997,
Abstract: The non-active mechanism of Ag-Cl clusters in surface-enhanced Raman scattering (SERS) was discussed on the basis of the study of the interaction and adsorption competition of chlorions with a series of compounds: benzoic acid, p-hydroxybenzoic acid, and m-hydroxybenzoic acid on silver surface. As a result of the addition of chlorions, the SERS signals of these molecules were sharply and rapidly reduced and quenched in intensity. The change of Raman bands at 1644 cm-1 for benzoic acid, and at 1636 cm-1 for p-hydroxybenzoic acid and m-hydroxybenzoic acid, before and after the addition of chlorions, indicated the desorption process of these adsorbed molecules, and the adsorption behavior of the molecules remaining adsorbed on the silver surface.
Synthesis of cage-like octa(trimethylsiloxy)silsesquioxane
Chunye Hu,Yan Qin,Changyou Yuan
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02884918
Abstract: Cage-like octa(trimethylsiloxy)silsesquioxane [ (Me3SiO)SiO1.5]8 has been synthesized via the trimethylsilylation of cubic tetramethylammonium silicate octamer [(Me4NO)-SiO1.5]8 with chlorotrimethylsilane. The silicate octamer can be selectively formed by the reaction of tetraethoxysilane Si(OEt)4 with aqueous tetramethylammonium hydroxide in equal molar ratio. Elementary analysis, FT-IR,1H,13C,29Si NMR are used to characterize these silsesquioxanes.
Molecular dynamics simulation of wetting behavior at CO2/water/solid interfaces
ShuYan Liu,XiaoNing Yang,Yan Qin
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3287-0
Abstract: We used molecular dynamics simulation to demonstrate the microscopic wetting behavior of two solid model surfaces for the first time. Hydrophilic and hydrophobic features were modeled in a dense CO2 fluid environment under various densities. The water droplet loses contact with the surface under the influence of higher density CO2 fluids on the hydrophobic surface. For the hydrophilic surface, no separation between the water droplet and the surface was observed. However, the contact angle of the water droplet on the hydrophilic surface was found to increase with the fluid density. The effect of dense CO2 fluid on the surface wettability can be interpreted in terms of enhanced interactions from the surrounding CO2 molecules.
Some Traveling Wave Solutions of a Hyperbolic Model for Chemotaxis in 1-D
Qin Zhang,Wen-yan Chen
ISRN Applied Mathematics , 2011, DOI: 10.5402/2011/137406
Abstract:
Convergence Theorems on Generalized Equilibrium Problems and Fixed Point Problems with Applications
Yan Hao,Sun Young Cho,Xiaolong Qin
Journal of Inequalities and Applications , 2010, DOI: 10.1155/2010/189036
Abstract: The purpose of this work is to introduce an iterative method for finding a common element of a solution set of a generalized equilibrium problem, of a solution set solutions of a variational inequality problem and of a fixed point set of a strict pseudocontraction. Strong convergence theorems are established in the framework of Hilbert spaces.
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