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Lou Y.H.,Sichuan Rural Irrigation and Water Conservancy Bureau | Lou Y.H.,China Agricultural University | Cui N.B.,University of Sichuan | Yang H.X.,University of Sichuan | Yang H.X.,Sichuan Water Conservancy Vocational College
Applied Mechanics and Materials | Year: 2014

Evaluation of water-saving development level of irrigation management level is an important foundation to make the water-saving and irrigation policy, and improve irrigation management. This paper established a comprehensive evaluation system for the developing level of water-saving and irrigation management after comprehensively analysis of main contents of irrigation management. It include 4 secondary level indicators and 16 third-level indicators, and build a comprehensive evaluation model. Further more, entropy method and gradation analysis method were introduced to calculate the combination weight of each evaluation indices, which enhance the scientific in weight calculation, and a comprehensive evaluating model for irrigation management and water-saving developing level was established on the basis of it. The comprehensive evaluation of irrigation management and water-saving developing for Sichuan Province and 21 other regions was done by this model, and the results are accord with Sichuan Province's actual situation of the irrigation management and water-saving developing. Therefore, the model of comprehensive evaluation for irrigation management and water-saving development level has a relative strong practicability, which can offer scientific guidance for irrigation management and water-saving development in different regions. © (2014) Trans Tech Publications, Switzerland.

Chen H.-J.,Southwest University of Science and Technology | Chen H.-J.,Sichuan Water Conservancy Vocational College | Fan T.-H.,Southwest University of Science and Technology | Mu J.,Sichuan Agricultural University
Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology | Year: 2016

In order to solve the blindness problem existing in the numerical scheduling of network congestion, a numerical scheduling method for network congestion based on multi-objective resolution optimization was proposed. The modeling expression for the numerical scheduling problem of network congestion was carried out. In addition, the optimal problem of congestion process scheduling was decomposed into the multi-objective optimization problem at the same time, namely the optimal task allocation problem of channel and routing congestion scheduling problem. According to the particle swarm optimization (PSO) algorithm, the calculation for the optimal solution of channel allocation problem was performed. Meanwhile, the constraint model was designed, and the congestion scheduling problem was solved with the genetic algorithm (GA). Moreover, the numerical scheduling of network at the congestion state was realized. The results show that the congestion scheduling scheme in the proposed algorithm has good enforceability. © 2016, Editorial Department of Journal of Shenyang University of Technology. All right reserved.

PubMed | University of Sichuan, University of Saskatchewan, Research Institute Co., Sichuan Water Conservancy Vocational College and Sichuan Agricultural University
Type: Journal Article | Journal: Journal of environmental sciences (China) | Year: 2014

Estuaries have been described as one of the most difficult environments on Earth. It is difficult to know how to treat the combined wastewater in tidal rivers at the estuary, where the situation is very different from ordinary fresh water rivers. Waste oyster shell was used as the active filler in this study in a bio-contact oxidation tank to treat the combined wastewater at the Fengtang Tidal River. With a middle-experimental scale of 360 m3/day, the average removal efficiency of COD, BOD, NH3-N, TP and TSS was 80.05%, 85.02%, 86.59%, 50.58% and 85.32%, respectively, in this bio-contact oxidation process. The living microbes in the biofilms on the waste oyster shell in this bio-contact oxidation tank, which were mainly composed of zoogloea, protozoa and micro-metazoa species, revealed that waste oyster shell as the filler was suitable material for combined wastewater degradation. This treatment method using waste oyster shell as active filler was then applied in a mangrove demonstration area for water quality improvement near the experiment area, with a treatment volume of 5 x 10(3) m3/day. Another project was also successfully applied in a constructed wetland, with a wastewater treatment volume of 1 x 10(3) m3/day. This technology is therefore feasible and can easily be applied on a larger scale.

Yun L.,Beijing Forestry University | Yun L.,Shanxi Jixian Forest Ecosystem Research Station | Bi H.,Beijing Forestry University | Gao L.,Beijing Forestry University | And 4 more authors.
Arid Land Research and Management | Year: 2012

Agroforestry has been widely applied in the Loess Plateau of China as a means of reducing soil and water losses, restoring ecological balance, and improving both land-use efficiency and economic returns. However, agroforestry also introduces a degree of competition for soil moisture and nutrients. Walnut (Juglans regia L.)-peanut (Arachis hypogaea L.) and walnut-soybean (Glycine max L. Merr.) intercropping systems that have been used throughout the Loess Plateau were selected as the basis for a study of agroforestry system-its advantages and its disadvantages with respect to soil moisture, soil nutrients, root distributions, yields, and economic returns. The results showed that soil moisture and nutrient levels were affected by intercropping with walnut trees, and that the degree to which they were affected decreased as distance from the trees increased. On the other hand, intercropping with walnut trees can increase land-use efficiency by 75% and economic returns by 17%. On the basis of the study findings, we conclude that walnut-peanut and walnut-soybean intercropping can be practical and beneficial in the study region, but irrigation and fertilization methods need to be further studied and improved, root barriers should be installed at the tree-crop interface, and the distance between crops and tree rows should be adjusted to minimize competition for soil moisture and nutrients. © 2012 Copyright Taylor and Francis Group, LLC.

Feng Z.-S.,University of Electronic Science and Technology of China | Wang L.-L.,University of Electronic Science and Technology of China | Wang Y.,University of Electronic Science and Technology of China | Chen J.-J.,University of Electronic Science and Technology of China | And 3 more authors.
Journal of Alloys and Compounds | Year: 2015

LiFePO4/Cu (LFP/Cu) composite as a cathode material for lithium-ion battery was successfully synthesized via a two-step chemical process. The reductant concentration, solution pH, temperature and reaction time of this chemical process were investigated based on a series of experiments to explore the optimal parameters. The structural characteristics and electrochemical properties of LFP/Cu composite were compared with pure LiFePO4. X-ray diffraction (XRD) indicated that the obtained LFP/Cu composite was well crystallized, in addition, the copper particles did not destroy the olivine structure of LiFePO4. Scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) element map showed that nano-sized copper particles exhibited a homogeneous distribution on the surface of LiFePO4. Electrochemical impedance spectroscopy (EIS) compared the charge-transfer resistance (Rct) of LFP/Cu and pure LiFePO4 electrode, indicating that the decrease of Rct was nearly 40% after adding moderate amount of nano-sized copper particles. The charge-discharge tests demonstrated that the optimized LFP/Cu composite with 6.18% nano-sized copper particles delivered the initial discharge capacity of 146.7 mAh g-1 at 0.1 C, which was much higher than pure LiFePO4 and all the other samples. The better electrochemical properties were mainly attributed to the significantly decrease of Rct and the enhancement of electronic conductivity, which is benefit from the superficial nano-sized copper particles. © 2015 Published by Elsevier B.V.

Xu L.-J.,Hydrochina Huadong Engineering Corporation | Xue Y.,Hydrochina Huadong Engineering Corporation | Zhang S.,Sichuan Water Conservancy Vocational College
Shiyan Liuti Lixue/Journal of Experiments in Fluid Mechanics | Year: 2013

The process of bubble formation is involved in a lot of gas-liquid reactors and process equipment. It is therefore important to understand bubble formation process and to develop computational models for the accurate prediction of the bubble formation characteristics in different bubbling regimes. Numerical simulation of bubble formation cycle on orifice were carried out using the combined level set and volume-of-fluid method and the predictions were experimentally validated, Effects of gas flow rate and orifice diameter on the bubbling regimes were discussed. Based on the simulation data and experimental data on the transition of bubble formation regimes, Froude and Bond numbers, the inlet gas velocity at orifice decreases with increase in the orifice diameter is presented.

Lei M.,University of Sichuan | Nie R.,University of Sichuan | Liu Y.,Sichuan Water Conservancy Vocational College | Liu X.,University of Sichuan
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2014

The flume experiments of clear water scouring comprising different gradations of non-uniform sediment were conducted on the basis of the previous researches about the scour depth of armoring layer. The characteristics of the equilibrium scour-depth under clear-water scouring conditions were investigated. A simplified and practical formula was proposed to calculate the scour depth of armoring layer by means of establishing the relationship between the thickness of armoring protection layer and that of movable bed surface layer in a generalized model for the armoring structure. The method was of adequate accuracy to agree the experiment data well.

Gong W.,China University of Petroleum - East China | Zhang W.,China University of Petroleum - East China | Gonzalez J.,Autonomous University of Barcelona | Ren Y.,China University of Petroleum - East China | Li Z.,Sichuan Water Conservancy Vocational College
International Journal of Distributed Sensor Networks | Year: 2015

Bilinear models have been successfully applied to separate two factors, for example, pose variances and different identities in face recognition problems. Asymmetric model is a type of bilinear model which models a system in the most concise way. But seldom there are works exploring the applications of asymmetric bilinear model on face recognition problem with illumination changes. In this work, we propose enhanced asymmetric model for illumination-robust face recognition. Instead of initializing the factor probabilities randomly, we initialize them with nearest neighbor method and optimize them for the test data. Above that, we update the factor model to be identified. We validate the proposed method on a designed data sample and extended Yale B dataset. The experiment results show that the enhanced asymmetric models give promising results and good recognition accuracies. © 2015 Wenjuan Gong et al.

Yang S.P.,Sichuan Water Conservancy Vocational College | Yu J.H.,Sichuan Water Conservancy Vocational College | Zhao Z.B.,Sichuan Water Conservancy Vocational College | Fu W.X.,University of Sichuan
Hydraulic Engineering III - Proceedings of the 3rd Technical Conference on Hydraulic Engineering, CHE 2014 | Year: 2015

In this study the disturbance factor in the general Hoek–Brown (HB) criterion is considered to be a gradually-attenuated variable from the excavation surface to the deep surrounding rocks. The elasto-plastic analytical solution is formulated for an axisymmetrical cavern model in which there exist a supported pressure at the wall of tunnel and a far-field pressure at infinity. The presented analytical model can well reflect the disturbance of the HB rock mass triggered by drilling and blasting excavation. © 2015 Taylor & Francis Group, London, UK.

Liu X.,Sichuan water conservancy vocational college
Metallurgical and Mining Industry | Year: 2015

In this paper, the author researches on the identity-related services and key technology application in Internet of Things (IoT). The paper summed up the characteristics of the Internet of Things (IOT) applications and current application situation from the perspectives of IOT application. IOT protocols and research work of organization are analyzed from the technical level which provides help for IOT architecture. This paper also focuses on several key technologies for the IOT applications, which includes the IOT service framework based on semantic, semantic annotation method for web service discovery, the context model and reasoning model based on ontology, the composition service of IOT and QoS, the design and implementation of smart middleware.

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