Xiangtan, China
Xiangtan, China

Xiangtan University, or XTU , is a university located in Xiangtan, Hunan. It was founded in 1958 and is organized into 22 Schools and Departments.Xiangtan University, located in Xiangtan City, the home town of Mao Zedong, is a comprehensive university operating under the joint support of the Hunan Provincial Government and the Ministry of Education. It is one of China’s first educational institutes authorized to award master’s degrees and is also among the earliest schools approved to enroll overseas students and students of national defense. In an evaluation conducted by the Ministry of Education, the university’s bachelor degree education was rated as excellent. Wikipedia.


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Lv Z.,Xiangtan University
Renewable and Sustainable Energy Reviews | Year: 2017

Using quantile regression technique, this paper explores the interaction effects of democracy and income on CO2 emissions in 19 emerging countries over the period 1997–2010. The results indicate a stronger and significant interaction impact on CO2 emissions only at the lower emission countries. Moreover, democracy reduces CO2 emissions but only if the country has already reached to a certain income level. The new empirical evidence from this study provides a more complete picture of the determinants of emissions throughout the conditional distribution, and these novel findings not only help advance the existing literature, but also can be of special interest to the country's policy makers, especially among the most democracy and least democracy nations. © 2017 Elsevier Ltd


Ye W.-B.,Xiangtan University
Applied Thermal Engineering | Year: 2017

Uniform air flow distribution is an important and fundamental issue to miscellaneous equipments. The detailed design method and design principle are presented in this work. The practical application for uniform air flow distribution is conducted according to the employed design method. Finite volume method (FVM) is used to verify the designed validation. The numerical treatment of convection terms in governing equations is based on the quadratic upwind interpolation of convective kinematics (QUICK) scheme. The well-know semi-implicit pressure-linked equation (SIMPLE) algorithm is used to treat the coupling of pressure and velocity fields. It is found that the design method is validated for the uniform air flow distribution. The unbalance rate of air flow distribution is less than 10%. Moreover, the uniform of air flow distribution can be further improved by adding vertical baffles. The developed design method is of great significance to obtain uniform air flow distribution. © 2016 Elsevier Ltd


Wang J.,Guizhou University | Zhou Y.,Xiangtan University
Nonlinear Analysis: Real World Applications | Year: 2011

This paper concerns the existence of mild solutions for semilinear fractional evolution equations and optimal controls in the α-norm. A suitable α-mild solution of the semilinear fractional evolution equations is introduced. The existence and uniqueness of α-mild solutions are proved by means of fractional calculus, singular version Gronwall inequality and LeraySchauder fixed point theorem. The existence of optimal pairs of system governed by fractional evolution equations is also presented. Finally, an example is given for demonstration. © 2010 Published by Elsevier Ltd. All rights reserved.


Wang J.,Guizhou University | Zhou Y.,Xiangtan University
Nonlinear Analysis: Real World Applications | Year: 2011

In this paper, we prove the existence and controllability results for fractional semilinear differential inclusions involving the Caputo derivative in Banach spaces. The results are obtained by using fractional calculation, operator semigroups and BohnenblustKarlin's fixed point theorem. At last, an example is given to illustrate the theory. © 2011 Elsevier Ltd. All rights reserved.


Pei Y.,Xiangtan University | Zeng X.C.,University of Nebraska - Lincoln
Nanoscale | Year: 2012

Unlike bulk materials, the physicochemical properties of nano-sized metal clusters can be strongly dependent on their atomic structure and size. Over the past two decades, major progress has been made in both the synthesis and characterization of a special class of ligated metal nanoclusters, namely, the thiolate-protected gold clusters with size less than 2 nm. Nevertheless, the determination of the precise atomic structure of thiolate-protected gold clusters is still a grand challenge to both experimentalists and theorists. The lack of atomic structures for many thiolate-protected gold clusters has hampered our in-depth understanding of their physicochemical properties and size-dependent structural evolution. Recent breakthroughs in the determination of the atomic structure of two clusters, [Au 25(SCH 2CH 2Ph) 18] q (q = -1, 0) and Au 102(p- MBA) 44, from X-ray crystallography have uncovered many new characteristics regarding the gold-sulfur bonding as well as the atomic packing structure in gold thiolate nanoclusters. Knowledge obtained from the atomic structures of both thiolate-protected gold clusters allows researchers to examine a more general "inherent structure rule" underlying this special class of ligated gold nanoclusters. That is, a highly stable thiolate-protected gold cluster can be viewed as a combination of a highly symmetric Au core and several protecting gold-thiolate "staple motifs", as illustrated by a general structural formula [Au] a+a′[Au(SR) 2] b[Au 2(SR) 3] c[Au 3(SR) 4] d[Au 4(SR) 5] e where a, a′, b, c, d and e are integers that satisfy certain constraints. In this review article, we highlight recent progress in the theoretical exploration and prediction of the atomic structures of various thiolate-protected gold clusters based on the "divide-and-protect" concept in general and the "inherent structure rule" in particular. As two demonstration examples, we show that the theoretically predicted lowest-energy structures of Au 25(SR) 8 - and Au 38(SR) 24 (-R is the alkylthiolate group) have been fully confirmed by later experiments, lending credence to the "inherent structure rule". This journal is © 2012 The Royal Society of Chemistry.


Zhou Y.,Xiangtan University | Jiao F.,Xiangtan University
Nonlinear Analysis: Real World Applications | Year: 2010

In this paper, the nonlocal Cauchy problem is discussed for the fractional evolution equations in an arbitrary Banach space and various criteria on the existence and uniqueness of mild solutions are obtained. An example to illustrate the applications of main results is also given. © 2009 Elsevier Ltd. All rights reserved.


A type of testing equipment for detecting the failure process of thermal barrier coating in a simulated working environment; it belongs to the field of simulated special working environment equipment. Testing equipment includes testing platform equipped with static or dynamic specimen holding apparatus, simulated module of working environment, real-time detection module, control panel. This invention is capable of simulating a high temperature, erosive, corrosive working environment for thermal barrier coated turbine blade of aero-engines; simulate high speed spinning working environment for thermal coated blade, simulate static working environment for guiding blade; perform real-time testing of temperature field, 3-D displacement field, crack initiation and expansion, surface oxidation, etc. This invention has achieved complete integration of high temperature, erosive, corrosive working environment for thermal barrier coating and complete integration static or dynamic working environment, complete integration of simulated working environment and real-time testing, thus providing a crucial testing platform and reference data to properly understand the failure mechanism of thermal barrier coated blade and to improve relevant designs; strong applicability.


A method for removing nitrogen-oxides by microwave assisted catalysis, including: 1) charging a catalyst capable of absorbing and interacting with microwave into a reaction tube of a reactor device, to form a reaction bed; and 2) heating the reaction bed by microwaves; when a temperature of the reaction bed is raised to 100-600 C., passing a gas containing nitrogen-oxides through the reaction bed, and performing a gas-solid reaction between the gas and the catalyst to remove the nitrogen-oxides from the gas.


Patent
Xiangtan University | Date: 2016-04-27

The present invention relates to a method for coproducing of adipic acid and nitrocyclohexane in high-selectivity. The method of the present invention is to coproduce adipic acid and nitrocyclohexane in one step from cyclohexane by using nitrogen oxides NOx as the oxidant and nitrating agent, with high selectivity and adjustable ratio of adipic acid and nitrocyclohexane, by adjusting the reaction conditions such as ratio of reactants, reaction temperature and reaction pressure, the types and amount of catalysts or inducing agents. The NO produced by the reaction can be recovered and again reacted with oxygen to produce NO_(x) for recycling.


Patent
Xiangtan University | Date: 2012-12-24

Provided is a microwave catalyst. The microwave catalyst comprises: i) an active catalyst component comprising a metal and/or a metal oxide; ii) a microwave-absorbing component comprising at least one of CuO, ferrite spinel, and active carbon; and iii) a support. The microwave catalyst can be used for denitration by microwave catalysis, and has advantages such as high denitration efficiency, low energy consumption, environmental friendliness, and low costs. Also provided is a process for preparing the microwave catalyst and the use thereof.

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