Kunming College

Kunming, China

Kunming College

Kunming, China
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Wang Y.-Z.,Kunming College | Wang P.,Yunnan Normal University | Li C.,Yunnan Normal University | Su Y.-Q.,Yunnan Normal University
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2016

A new oxovanadium(V) complex, [VOL(OCH3)(CH3OH], where L is N′-(3,5-ditertbutyl-2-hydroxybenzylidene)-4-methoxybenzohydrazide, was prepared and structurally characterized by physicochemical methods and single-crystal X-ray diffraction. The complex crystallizes in the monoclinic space group P21/c, with a = 8.958(1) Å, b = 12.479(2), c = 23.289(2) Å, β = 94.032(3)°, V = 2597.0(5) Å3, Z = 4, R1 = 0.0387, and wR2 = 0.0942. X-ray structural analysis indicates that the benzohydrazone ligand coordinates to the V atom through the phenolate O, imino N, and enolic O atoms. The V atom in the complex is coordinated by one benzohydrazone ligand, one methoxy ligand, one methanol ligand, and one oxo O atom, forming an octahedral coordination. The crystal structure of the complex is stabilized by hydrogen bonds. The complex is an effective catalyst for sulfoxidation. Copyright © 2016 Taylor & Francis Group, LLC.


Wang Y.-Z.,Kunming College | Wang P.,Yunnan Normal University | Li C.,Yunnan Normal University | Su Y.-Q.,Yunnan Normal University
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2016

A new iron(III) complex, [FeL2(OH2)2]·2H2O, where L is the deprotonated form of 3-methoxysalicylaldehyde, was prepared and structurally characterized by physicochemical methods and single-crystal X-ray diffraction. The complex crystallizes in the orthorhombic space group Pna21, with a = 13.376(2) Å, b = 22.802(3), c = 7.228(1) Å, V = 2204.6(5) Å3, Z = 4, R1 = 0.0800, and wR2 = 0.1990. X-ray structural analysis indicates that the ligand coordinates to the Fe atom through the phenolate O and carbonyl O atoms. The Fe atom in the complex is coordinated by two L ligands and two water molecules, forming an octahedral coordination. The crystal structure of the complex is stabilized by hydrogen bonds. The complex is an effective catalyst for sulfoxidation. Copyright © 2016 Taylor & Francis Group, LLC.


Gao Y.,Yunnan Normal University | Chen S.-B.,Kunming College | Yang H.,Yunnan Normal University
Lecture Notes in Electrical Engineering | Year: 2011

The stationary properties of the stochastic system driven by cross-correlated additive white noise and multiplicative colored noise were investigated. The stationary probability distribution (SPD) of the stochastic system was derived. The SPD of the different correlation time between white and colored noises (τ 1) with the correlation time between the colored noises (τ 2) and the coefficient of correlation (r) fixed, shows the onset of trimodal-unimodal transition. Those two correlation time have different effects on the stationary properties of the stochastic system. © 2011 Springer-Verlag Berlin Heidelberg.


Yuan H.,China Three Gorges University | Ma H.,KunMing College
Procedia Engineering | Year: 2012

The claim negotiations are very important to both sides which have attended the engineering project construction. On one hand, the contractors want to cut down loss through negotiations and protect their own legitimate interests, on the other hand, the owners want to shift risks by it and reduce the project construction cost. The strategy and tactics of both sides are one kind of typical game form in the claim negotiations. This article firstly uses alternating offers model to describe the claim negotiations between the owner's and contractor's bargaining. By estimating the contractor's possibility distribute of retention value and the conditional probability of contractor's biding price given under the assumption, the prior beliefs are revised with the Bayesian principle and counter-offer strategy is adjusted. Finally, the paper analyzes and uses strategies which have been considered the time value of money of each other's bargaining to enable the claim event be solved effectively, of course enhancing the engineer project's construction-efficiency. © 2012 Published by Elsevier Ltd.


He S.-L.,Kunming College | Huang Y.,Kunming College
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2011

In order to improve the accuracy of a nonlinear vibration solution obtained with a averaging method, the effect of damping on the vibration period must be considered. The different function of the circular frequencies between the differential equation to be solved and its derived equation was expressed as a polynomial of the damping coefficient. Usually taking the damping coefficient as the different function would improve the accuracy of the averaging method. The linear damped vibration and the Duffing-type damped vibration were solved with an improved averaging method proposed by the authors. It was proved that the improved averaging method is effective to improve the accuracy of the solution by comparing its solutions with the exact solution of the linear damped vibration and the numerical solution of the Duffing-type damped vibration.


Wang Y.-Z.,Kunming College | Gao Y.,Kunming College | Su Y.-Q.,Yunnan Normal University | Wang P.,Yunnan Normal University | Li C.,Yunnan Normal University
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2013

A new benzohydrazone compound, N′-(3-bromo-2-hydro xybenzylidene)-4-nitrobenzohydrazide (H2L), and its oxovanadium(V) complex, 2[VOL(BHA)]·CH3CN, where HBHA is benzohydroxamic acid, was prepared and structurally characterized by physicochemical methods and single-crystal X-ray diffraction. The benzohydrazone compound crystallizes in the monoclinic space group P21/c, with a = 11.2211(15), b = 13.5515(18), c = 9.2850(10) Å, β = 90.554(2)°, V = 1411.8(30 Å3, Z = 4, R1 = 0.0757, and wR2 = 0.1920. The oxovanadium(V) complex crystallizes in the triclinic space group P-1, with a = 11.3754(13), b = 14.7186(19), c = 15.611(2) Å, α = 83.952(2)°, β = 72.346(2)°, γ = 69.848(2)°, V = 2338.1(5) Å3, Z = 2, R1 = 0.0886, and wR2 = 0.2245. X-ray structural analysis indicates that the benzohydrazone ligand coordinates to the V atom through the phenolate O, imino N, and enolic O atoms. The V atom in the complex is coordinated by one benzohydrazone ligand and one BHA ligand, as well as one oxo O atom, forming an octahedral coordination. The crystal structures of the ligand and the complex are stabilized by hydrogen bonds. The complex is an effective catalyst for sulfoxidation. Supplemental materials are available for this article. Go to the publisher's online edition of Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry to view the supplemental file. Copyright © Taylor and Francis Group, LLC.


Shen D.,Yunnan University | Cui Y.,Yunnan University | Zhang A.,Yunnan University | Yang Y.,Kunming College | Wu K.,University of Montréal
2010 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2010 | Year: 2010

The study of Nakagami fading channel is very important for wireless communications. A simple simulation method for Nakagami fading channel is proposed, which bases on the simulation of Rayleigh distribution. The first-order and second-order statistical characteristics of the simulation results and the measured data can be a good match. © 2010 IEEE.


Liu H.,Water Resources University | Miao D.,Water Resources University | Miao D.,Kunming College | Liu F.,Water Resources University
Advanced Materials Research | Year: 2011

Most concerns have focused on the arsenic (As) contamination in wastewater. Montmorillonite (MMT) has been proved to be a good adsorbent for removal heavy metals existing as cation in ground water while it is invalid for anions. However, arsenic usually exists as anions in aqueous. Accordingly, suitable modifications on MMT need to be done before using. This paper presents the results that a kind of commercial MMT has been modified by iron oxides under normal and inverse titration conditions. The x-ray diffraction (XRD), Thermal Gravimetry Analysis and Differential Thermal Analysis (TGA-DTA) and SBET analysis have been employed to elucidate the modification mechanisms. Modification characteristic analysis illustrated that the iron oxide associated with MMT by coated style as polymerization of hydroxyl-Fe (Fe (OH) 3) under inverse titration condition. Under normal titration condition, on the other hand, the iron oxide associated with MMT predominant by intercalation as goethite (FeOOH). The arsenic removal efficiencies of different modified products for polluted water have also been verified by batch experiments. Results proved that Iron oxide modified MMT on the removal efficiency of arsenic significantly increased and the normal titration is better than inverse titration as indicated by the arsenic removal ratios under the same experimental conditions. Based on these results, the iron oxide modified MMT by normal titration procedure is a promising material for removal arsenic in wastewaters. © (2011) Trans Tech Publications, Switzerland.


Wang Y.Z.,Kunming College | Gao Y.,Kunming College | Su Y.Q.,Yunnan Normal University | Wang P.,Yunnan Normal University | Li C.,Yunnan Normal University
Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya | Year: 2013

A new benzohydrazone compound N'-(2-hydroxy-5-methoxybenzylidene)-4- dimethylami- nobenzohydrazide (H2L) and its oxovanadium(V) complex [VOL(BHA)] · H2O, where HBHA is benzohy- droxamic acid, were prepared and structurally characterized by physic-chemical methods and single crystal X-ray diffraction. The benzohydrazone compound crystallizes in the monoclinic space group C2/c with a = 35.5873(12), b = 10.4628(4), c = 18.6059(6) Å, β = 109.499(1)°, V = 6530.4(4) Å3, Z = 16, R1 = 0.0603, and wR2 = 0.1575. The oxovanadium(V) complex crystallizes in the triclinic space group P with a = 7.4775(4), b = 9.7837(5), c = 17.7076(8) Å, a = 99.457(2)°, β = 98.699(2)°, = 101.429(2)°, V = 1229.7(1) Å3, Z = 2, R1 = 0.0431, and wR2 = 0.0937. X-ray structural analysis indicates that the benzohydrazone ligand L 2- coor- dinates to the V atom through the phenolate O, imino N, and enolic O atoms. The V atom in complex I is coordinated by one benzohydrazone ligand and one BHA ligand, as well as one oxo O atom, forming an octa- hedral coordination. The crystal structures of H2L and I are stabilized by hydrogen bonds. Complex I is an effective catalyst for sulfoxidation. © Pleiades Publishing, Ltd., 2013.

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