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Zhang J.-L.,Guizhou University | Zhang J.-L.,Guizhou Industry Polytechnic College | Wang H.-Y.,Guizhou University
Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition) | Year: 2013

The stiffness characteristics and influential factors of air springs such as effective pressure area, shape of the base site, the initial air spring pressure, auxiliary chamber and the molecule moving process in vehicles were introduced. The FE model of membrane type air springs was established by FEA software ABAQUS. The simulation analysis on stiffness characteristics of membrane type air spring under different cord angles, cord layer spacings, cord densities and cord layers. The results show that the cord parameters are the sensitive parameters which affect the stiffness characteristics of membrane type air springs; with the increase of cord spacing gap, the vertical stiffness of air springs decreases; with the increase of the cord angle, the vertical stiffness of air springs decreases; with the increase of cord layers, the vertical stiffness of air spring increases; and the cord layer gap and the cord spacing density have little effect on the air spring vertical stiffness, but cord angle and cord layer have significant effect. Source

Guo J.,Guizhou University | Zhao Q.,Guizhou University | Wang J.,Xian University of Architecture and Technology | Zhang J.,Guizhou Industry Polytechnic College
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

Rockburst is one key scientific problem in deep underground engineering and deep mining condition. On the basis of the criteria for strength and structural failure of rocks, a new model for prediction and classification of rockburst was proposed considering the intrinsic relations between the elastic strain energy and the rockburst. The geological parameters including geostress, rock integrity designation (RID), tensile strength and Poisson's ratio were adopted to establish the rockburst model and to reflect the mechanical, brittleness, integrity and stored energy requirement for rockburst. Compared with the traditional model, the model based on the elastic energy revealed the symmetric distribution of rockburst around the axis of tunnel and the rock burst difference along the tunnel. For 4 grades of rockbursts, intense, moderate, weak and no rockbursts, 3 boundary values were presented as 3, 10 and 110. Rockburst in some projects in China were used to verify the model and the good agreements were obtained. ©, 2015, Academia Sinica. All right reserved. Source

Xia Y.,Guilin University of Electronic Technology | Chen H.,Guilin University of Electronic Technology | Fan L.,Shantou University | Dai F.,Guizhou Industry Polytechnic College
2013 8th International ICST Conference on Communications and Networking in China, CHINACOM 2013 - Proceedings | Year: 2013

In this paper, optimal power control for source and relay in an energy harvesting relay network is studied. The relay network includes a source node, an amplify-and-forward relay node, and a destination node. The source and relay are able to harvest energy from nature, and have their own data to transmit. The source and relay adjust their transmission powers according to the amount of harvested energy and the data transmission requirement. The goal of power adaptation is to maximize the total throughput while satisfying the transmission power constraints of the source and relay, as well as the energy causality constraint. An optimization problem is formulated and its solution is obtained. Simulation results demonstrate the optimal transmission powers under various energy harvesting processes. © 2013 IEEE. Source

Han L.,East China Normal University | Han L.,Guizhou University | Tao H.,Guizhou University | Zhang Y.-M.,Guizhou University | And 2 more authors.
Xiandai Huagong/Modern Chemical Industry | Year: 2014

A hydrogen peroxide biosensor has been made by horseradish peroxidase/polyvinyl butyral/multiwall carbon nanotube immobilizing on the glassy carbon electrode surface. Using hydroquinone as mediator, the electrocatalytic properties of this sensor toward hydrogen peroxide are observed by i-t curves, which are compared with ultraviolet spectrophotometry. The biosensor exhibits easy-making, simple operation, quick inspection, wider linear range and lower detection limit ability. In contrast, ultraviolet spectrophotometry has advantages in reproducibility, stability and noise immunity. Source

Fan B.,Chinese Academy of science | Fan B.,Guizhou Industry Polytechnic College | Zhao Z.-Q.,Chinese Academy of science | Tao F.,Chinese Academy of science | And 6 more authors.
Chemical Geology | Year: 2016

The magnesium (Mg) isotopic composition of river waters is mainly controlled by riverine Mg sources and geochemical processes. It is meaningful to characterize Mg isotope behavior for us in understanding chemical weathering and other geochemical processes, such as secondary mineral formation linked to environmental conditions. The Huanghe basin was chosen to investigate the behavior of Mg isotopes during river erosion in temperate-semiarid and arid climate. Dissolved Mg shows a wide range of δ26Mg values, ranging from -1.53 ‰ to -0.11 ‰, with most values being close to -1.09 ‰. By comparison, most of the suspended loads are enriched in heavy Mg isotope, with δ26Mg values ranging from -2.00 ‰ to -0.62 ‰, which is controlled by mineralogy. The Mg isotopic composition in the upstream is mainly determined by the mixture between carbonate and silicate sources. When the Huanghe flows through the Loess Plateau, the dissolved Mg decreased due to the dissolution of easily dissoluble phases in loess, such as MgCl2 or MgSO4. Carbonates weathering and evaporites dissolution are the major controlling factor of the evolution of Mg isotopic composition in dissolved phase, though evaporation-related precipitation of secondary carbonates also influences the dissolved Mg isotope composition in some tributaries. The strong relationships between δ26Mg and pH, temperature, and δ18O suggest that the Mg isotope system bears significant information about the hydrogeochemical characteristics and climate conditions of the Huanghe basin. © 2016. Source

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