Guiyang, China

Guizhou University
Guiyang, China

Guizhou University is a public coeducational university, located in the suburban outskirts of Guiyang, the capital city of Guizhou Province, China. The university is one of the key 211 Project universities on mainland China.Originally founded in 1902, Guizhou University is one of the province’s seven major universities and the flagship institution of higher learning in Guizhou. It is also one of the largest universities in the Southwest of China catering to over thirty thousand students. Wikipedia.

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This paper presents new CCD BV RI light curves of the newly discovered RS CVn eclipsing binary V1034 Her in 2009 and 2010, the shapes of which are different from previously published results. They show an asymmetric outside eclipse, and we try to use a spot model to explain the phenomenon. Using the Wilson-Devinney program with a one-spot or two-spot model, photometric solutions of the system and starspot parameters were derived. Comparing the two results shows that the case of two spots is more successful in reproducing light-curve distortions. Looking at all the spot longitudes, the trend is towards active longitude belts and each active longitude belt may switch. Comparing the light curves from 2009 and 2010, we can see that the light curve changes over the long time scale of a year, especially in phase 0.25. In addition, we also collected the values of the maximum amplitudes of photometric distortion of the short-period RS CVn binary. We found for the first time that there is a trend of increasing activity with decreasing orbital period. Finally, fitting all available light minimum times including our newly obtained ones with a polynomial function confirmed that the orbital period of V1034 Her increased. © 2012 National Astronomical Observatories of Chinese Academy of Sciences and IOP Publishing Ltd.

Ni X.-L.,Guizhou University | Xiao X.,Guizhou University | Cong H.,Guizhou University | Zhu Q.-J.,Guizhou University | And 2 more authors.
Accounts of Chemical Research | Year: 2014

ConspectusSupramolecular architectures and materials have attracted immense attention during the last decades because they not only open the possibility of obtaining a large variety of aesthetically interesting structures but also have applications in gas storage, sensors, separation, catalysis, and so on. On the other hand, cucurbit[n]urils (Q[n]s), a relatively new class of macrocyclic hosts with a rigid hydrophobic cavity and two identical carbonyl fringed portals, have attracted much attention in supramolecular chemistry. Because of the strong charge-dipole and hydrogen bonding interactions, as well as hydrophobic and hydrophilic effect derived from the negative portals and rigid cavities of Q[n]s, nearly all research in Q[n]s has been focused on utilizing the portals and cavities to construct supramolecular assemblies similar to other macrocyclic receptors such as cyclodextrin and calixarenes. Interestingly, a recent study revealed that other weak noncovalent interactions such as hydrogen bonding and π···π stacking, as well as C-H···π and ion-dipole interactions, could also be defined as "outer-surface interactions", which are derived from the electrostatically positive outer surface of Q[n]s. These interactions could be the driving forces in the formation of various novel Q[n]-based supramolecular architectures and functional materials.In this Account, we provide a comprehensive overview of supramolecular self-assemblies based on the outer-surface interactions of Q[n]s. These outer-surface interactions include those between Q[n]s, Q[n]s and aromatic molecules, Q[n]s and calixarenes, Q[n]s and inorganic complex ions, and Q[n]s and polyoxometalates. Pioneering work has shown that such weak noncovalent interactions play very important roles in the formation of various Q[n]-based functional materials and supramolecular architectures. For example, hydrogen bonds in outer-surface interactions between Q[n] molecules not only function as the sole driving force in the formation of one-dimensional Q[n] porous channels but also assist the bonding forces of the channels in capturing and accommodating acetylene molecules and carbon dioxide in the channel cavities. Moreover, upon introduction of a third species such as an aromatic molecule or inorganic anion into the Q[n]/metal system, "outer-surface interactions" could lead to Q[n]/metal-based self-assemblies from simple finite supramolecular coordination complexes to infinite polydimensional supramolecular architectures and other structures.Overall, this Account focuses on the novel self-assembly driving force derived from Q[n]s including (i) concepts of the outer-surface interactions of Q[n]s, (ii) providing plausible explanations of the mechanisms of the outer-surface interactions of Q[n]s, and (iii) introduction of an overview of the developments and practical applications of outer-surface interactions of Q[n]s in supramolecular chemistry. It is hoped that this study based on the outer-surface interactions of Q[n]s can enrich the field of molecular engineering of functional supramolecular systems and provide new opportunities for the construction of functional materials and architectures. © 2014 American Chemical Society.

Song B.,Guizhou University
Journal of Agricultural and Food Chemistry | Year: 2013

Southern rice black-streaked dwarf virus (SRBSDV) is a rice pathogen that had an outbreak in southern China in 2010 and caused significant crop losses. Therefore, screening for effective antiviral drugs against SRBSDV is very important. This study used rice suspension cells infected with SRBSDV by polyethylene glycol-mediated uptake for screening antiviral drugs. SRBSDV P7-1, which is coded by the S7-1 gene, has an intrinsic ability to self-interact to form tubules that play an important role in viral infection. Therefore, relative expression level of the SRBSDV S7-1 gene in infected rice suspension cells was assayed by real-time quantitative polymerase chain reaction to evaluate the antiviral activities of various drugs. Dufulin displayed the highest inhibitory activity against SRBSDV S7-1 expression. In addition, changes in peroxidase (POD), polyphenol oxidase (PPO), and phenylalanine ammonia-lyase (PAL) activities were determined in inoculated and noninoculated cells. The results showed that both POD and PPO activities increased upon dufulin treatment. Furthermore, the validity of this approach was confirmed in an in vivo experiment in which dufulin was found to effectively inhibit SRBSDV. © 2013 American Chemical Society.

Jiming L.,Guizhou University
Advances in Information Sciences and Service Sciences | Year: 2012

We can easy-to-extract a lot of characteristics of image classification. But in characteristic blade leaves, some functions may have little or no contribution for the classification of leaves. Worse still, some of the characteristics can be used as a "noise" and depress the classification accuracy. That is to say, this is very important, reduce characteristic. Rough set is a kind of effective characteristics of tools. To reduce this paper puts forward a blade classification algorithm based on rough set. Our main improve the features of reduced.

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.

Sun Y.,Guizhou University
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

On the foundation of non-seismic active earth pressure theory, the seismic active earth pressure formulas, in the conditions of filling surface incline, wall back incline, filling soil having the characteristic of c and φ, having the c and φ action between the wall back and filling soil, the filling soil having horizontal and vertical acceleration, were obtained with differential layer method, these formulas included their distribution and total force. At the present time, the every active earth pressure formula in earthquake and non-earthquake condition is the special example of this paper's construction. The total earth pressure calculated with differential layer method is consistent with other method such as Coulomb's earth wedge equilibrium method; but its acting position is raised up; therefore, the design of retaining wall oughted to pay enough attention to this aspect.

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.

Bhadury P.S.,Guizhou University | Li H.,Guizhou University
Synlett | Year: 2012

This account summarizes the results of recent studies conducted in our group on the development of chiral thiourea/cinchona and Brnsted acid derived bifunctional organocatalysts. Selected asymmetric organocatalytic transformations were targeted to obtain enantioenriched bioactive products. Special emphasis was placed on the preparation of environmentally friendly anti-plant viral agents such as enantiomerically enriched -aminophosphonates and methods to assess the enantiomeric purity of these products on selected chiral stationary phases. The review also tries to delineate the underlying mechanism of various asymmetric transformations by BINOL-phosphoric acid-induced activation of imines and to make unambiguous assignments of the absolute configuration of -aminophosphonates obtained from organocatalytic hydrophosphonylation of pregenerated and in situ generated imines. © Georg Thieme Verlag Stuttgart · New York.

Guizhou University | Date: 2012-06-26

Disclosed are a gradient bioceramic coating comprising a rare earth oxide, a broadband laser method for preparing the bioceramic coating, and the use of the bioceramic coating in the field of medical materials.

Guizhou Aluminums Factory, Guizhou University and Guizhou Academy Of Science | Date: 2011-03-23

A high strength casting aluminum alloy material comprises (in weight %) Cu 2.0-6.0%, Mn 0.05-1.0%, Ti 0.01-0.5%,Cr0.01-0.2%, Cd 0.01-0.4%, Zr 0.01-0.25%, B 0.005-0.04%, rare earth 0.05-0.3%, and balance aluminum and trace impurities. The alloy has reduced cost.

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