Liu Y.,Xuzhou Normal University |
Yu Y.,Xuzhou Institute of Technology
Complex Analysis and Operator Theory | Year: 2012
Let φ be an analytic self-map of the unit disk D, H(D) the space of analytic functions on D and g ε H(D). The boundedness and compactness of the operator DC φ: H∞ → Z are investigated in this paper. © 2010 Springer Basel AG.
Feng C.,Xuzhou Institute of Technology
Acta Chimica Sinica | Year: 2012
The DFT-B3LYP method, with the basis set 6-31G, was employed to calculate the molecular geometries and electronic structures of 24 3-substituted sulfur-5-(2-hydroxyphenyl)-4H-1, 2, 4-triazole compounds. EHOMO, ELUMO, ENHOMO, ENLUMO, QC1~QC8, Qn1~Qn3, QO, QS, ΔE1, ΔE2, ΣQ were selected as quantum chemical descriptors (qc). The quantitative structure-activity relationships (QSAR) were established by using leaps-and-bounds regression analysis for the antibacterial activities (AJ: Am, Ae and As) of 13 compounds to Escherichia coli, Monilia albican and Staphylococcus aureus along with the qc. The correlation coefficients (R2) and the leave-one-out (LOO) cross validation Rcv 2 for the Ae, Am and As models were 0.930 and 0.871; 0.926 and 0.869; 0.781 and 0.572 respectively. The QSAR models have both favorable estimation stability and good prediction capability by Radj 2, F, Rcv 2, VIF, AIC, FIT tests. The results indicate that the ΔE1 and ΣQ are main factors which can affect the bioactivities of these compounds directly. The antibacterial activities of the compounds increase with the increase of the ΣQ; however the higher the ΔE1 is, the lower the AJ is. The possible mechanism has been given for the antibacterial of the triazole compounds. It is known that the suitable structural modifications of R group in triazole compounds with the strong electron- attracting one are beneficial to the antibacterial activities. According to the results (11 compounds) obtained from the structural modifications, the antibacterial activities of four modified molecules are over 100% when mass fraction is 0.01%, and it is expected to be confirmed by using biologic experiments.
Rui Y.,Xuzhou Institute of Technology
Applied Mechanics and Materials | Year: 2014
This paper mainly presents the study of preparation and application of green vegetation concrete, pervious concrete, and aquatic conservation concrete. The research includes material screening, mix proportion, operating points, construction process, and application scope. It has been observed that green and eco-friendly concrete can protect urban ecological system from departure of balance and contribute to realizing the sustainable development. © (2014) Trans Tech Publications, Switzerland.
Pan Y.-W.,Xuzhou Institute of Technology
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2013
Two kinds of tetrapod-like zinc oxide nanostructures were fabricated using chemical vapor deposition method under argon and oxygen mixed ambient condition. The source materials were pure zinc powders. No catalyst was used during reaction. X-ray diffraction, scanning electron microscopy, transmission electron microscopy and photoluminescence spectroscopy techniques were used to characterize their structures and optical properties. The nano productions are high purity zinc oxide with the wurtzite structure. Two kinds of zinc oxide nano productions possess three-dimensional structures, which are tetrapod-flake structure and tetrapod-wire structure, respectively. The nano productions have large length-diameter ratio and show a typical nano/micro-structure. By comparing the ultra-violet emission peak and visible emission band of the two zinc oxide nanostructures, the origin of the visible emission and the influence of their structures on optical emission properties are discussed.
Qu T.Y.,Xuzhou Institute of Technology
Advanced Materials Research | Year: 2014
The primary method of power system fault diagnosis is that the fault section estimation is demonstrated a 0-1 programming model according to the acting theory of protective relays. This paper proposed a kind improved artificial fish -swarm algorithm: binary artificial fish -swarm algorithm(BAFA) for this kind of problem. Forward speed of optimal direction between swarm-behavior and follow-behavior is analyzed and a comparative analysis is made with genetic algorithm(GA) on this basis. Results indicate that follow-behavior is superior to swarm-behavior on forward speed of optimal direction and BAFA is superior to GA on the comprehensive performance. Meanwhile, it is shown that BAFA has the fast convergence speed and better optimization ability. © (2014) Trans Tech Publications, Switzerland.
Chong F.,Xuzhou Institute of Technology
Journal of Thermal Spray Technology | Year: 2013
Structure of 1-mm tungsten (W) coating on copper (Cu) with the different compliant layers was designed and optimized by means of ANSYS code. Three materials of titanium, nickel-chromium-aluminum alloys, and W/Cu mixtures with a thickness of 0.5 mm were selected as the compliant layers to evaluate their effects on the interface stress between W and Cu, strain, and the surface temperature under the heat load of 5 MW/m2. Application of the compliant layers can obviously alleviate the interface stress concentration compared to the sharp interface. The maximum stress reduction of about 25% was obtained from the W/Cu-compliant layer; however, the surface temperature was increased only by 12 C. Further investigation on the W/Cu-compliant layer revealed that 0.1-0.2-mm 20-35 vol.% W was the optimum structure for 1-mm W coating, which resulted in the smallest peak stress of 299 MPa and the equivalent plastic strain of 0.01%. © 2012 ASM International.
Du X.,Xuzhou Institute of Technology
Huagong Xuebao/CIESC Journal | Year: 2010
Polybrominated dibenzofurans (PBDFs) are important toxic organic contaminants released from the combustion and Pintsch process of brominated flame retardants. The properties of PBDFs are related to their structures. The structure of polybrominated dibenzothiophenes (PBDTs) is similar to that of PBDFs. In this study, atomic characteristic values of 254 molecular structural patterns of PBDEs and PBDTs are calculated, and a new connectivity index, the path index, is obtained by applying the technique of molecule graphics. The path index is combined with five thermodynamic properties of PBDFs, including molecular total energy (ET), standard enthalpy (H0), free energy (G0), standard entropy (S0) and heat capacity at constant volume (cv 0), along with four thermodynamic properties of PBDTs, including standard enthalpy (H0), free energy (G0), standard enthalpy of formation (ΔfH0) and standard free energy of formation (ΔfG0). Nine quantitative structure-property relationship models (r2>0.995) are obtained by multiple linear regression method. The Jackknifed cross validation is used to test the stability and prediction ability of each model and good results (r2>0.995) are obtained. The relative mean deviation is 0.52% to S0. The model developed is in good agreement with the values of S0 in literature. © All Rights Reserved.
Du X.,Xuzhou Institute of Technology
Huagong Xuebao/CIESC Journal | Year: 2014
Based on the structure characteristics of bromine substituents and conjugated matrix, a new path location index mP is defined. The electrotopological state indices (E9) and electronegativity distance vector (M26) of 209 polybrominated diphenyl ethers (PBDEs) are calculated. It shows that mP, E9 and M26 have good structural selectivity for organic pollutant. Then, the multiple regression method is used to establish relationships between the molecular structure of PBDEs and four parameters: gas-chromatographic relative retention time (tR), n-octanol pair partition coefficient (lgKOA), supercooled liquid vapour pressures (lgPL) and toxicity (lgI). With the four predictive models, the correlation coefficients are 0.991, 0.997, 0.998 and 0.904 with the standard deviation of 0.031, 0.104, 0.100 and 0.358, respectively. Three structural parameters are used as the input neurons of the BP neural network and different network architectures to get several satisfying neural network models for predicting tR, lgKOA, and lgPL. The results are better than those by the multiple regression method, which shows significant nonlinear relationships between the physicochemical properties of PBDEs and the three structural parameters. © All Rights Reserved.
Wang J.Q.,Xuzhou Institute of Technology
Advanced Materials Research | Year: 2014
In order to improve the performance of cement mortar, using compression test, flexural strength test, splitting test, adhesion test and dynamic modulus test, the improvement effect of carboxylic styrene butadiene latex on the mechanical properties of cement mortar was explored, Research results showed that with the increases the polymer-cement ratio, the flexural strength, compressive strength, splitting strength and adhesive strength of mechanism mortar of modified cement mortar all increase, and the dynamic elastic modulus decreases. Carboxylic styrene butadiene latex enhances the flexibility and anti-deforming capability of cement mortar, thereby also improves the pavement performance. The results clarify the properties variation law of cement mortar before and after modification, this provides scientific guidance for polymer latex modified cement mortar mix design. © (2014) Trans Tech Publications, Switzerland.
Su Y.-H.,Xuzhou Institute of Technology
Mathematical and Computer Modelling | Year: 2011
This paper is concerned with the existence of positive solutions to the p-Laplacian dynamic equation (φp(u Δ(t))) ∇L+h(t)f(t,u(t),uδ(t))=0,t∈[0,T] T subject to boundary conditions u(0)-B 0(∑ i=1 m-2aiu Δ(ξi))=0,uδ(T)=0, where φp(u)=|u| p-2u with p>1. By using the fixed-point theorem due to Avery and Peterson, we prove that the boundary value problem has at least triple or arbitrary positive solutions. Our results are new for the special cases of difference equations and differential equations as well as in the general time scale setting. As an application, an example is given to illustrate the result. The interesting point in this paper is that the nonlinear term f is involved with the first-order derivative explicitly. © 2010 Elsevier Ltd.