Applied Mechanics and Materials Vols. 246-247

Abstract: The mathematical model of solving two-phase flow of gas and dust particles was built by established the k-ε-Θ-kp equation. Moreover, by using FLUENT software, the diffusion rule of dust pollution in the whole-rock fully mechanized workface was researched with different air-draft amount. The result showed that when the air-draft amount increased from 320m3/min to 600m3/min, de-dust ability of extraction fan drum is gathering strength, pervasion intensity of producing dust is continuously decreased in tunneling place. The simulation results of each measuring point are basically consistent with the field measurement results.

Abstract: In logging field, saturation evaluation in tuffaceous sandstone reservoirs has been a difficult issue to be solved urgently. It is mainly due to the effect of complex pore structures in tuffaceous sandstone reservoirs. Compared with the normal sandstones, the tuffaceous sands have the properties of diversity origination, complex mineral components, easily transformed mineral, complex digenesis and porosity evolution .The comprehensive analyses of cores, thin slices, SEM, mercury-injection data and former research outcome of Beier oilfield on the porous structure and reservoir physical property of sandstones. The tuffaceous alteration is different under different burial phase and diagenetic environment and has different effects on the porosity of coarse grain have a constructive affection to the secondary porosity.

Abstract: At present, in view of the status that the common DC power supply output voltage is fixed single, non-adjustable and practicality poor, this paper introduces a kind of numerical control power system that has many source output by using switch power supply circuit technology. The output voltage of the power based on single chip technology is numerical control adjustment. The major component of the power is voltage regulator circuit, input over-voltage protection circuit, output over-voltage protection circuit, DC/AC conversion circuit, filter circuit and full-bridge circuit. The power can offer a variety of different stable voltage output values and has display function. Through the PROTEUS software simulation and circuit testing, output effect of the power is good, practicability is great, and can be used as a variety of portable electrical universal power supply.

Abstract: The mathematical model of solving two-phase flow of gas and dust particles was built by established the k-ε equation. Moreover, by basing on Eulerian-Lagrangian model and using FLUENT software, the diffusion rule of dust pollution in full-mechanized caving face was confirmed. Based on negative pressure spray dust-settling mechanism, negative pressure spray technology was developed between hydraulic supports, in drawing opening position and shearer, and it was determined by the optimal spray pressure for 4 MPa. After negative pressure spray technology was applied in fully mechanized caving face, the dust concentration was down significantly.

Abstract: A review is performed to introduce the characteristics of hydraulic accumulator comprehensively and describe the actual functions systematically, analyzes the key points of selections, applications and maintenance of accumulator, and looks forward to the application trends in the future.

Abstract: The state and progress in the treatment technology of dyeing wastewater are summarized in this paper, especially the new treatment technologies coming about in the latest years. The developing trend of treatment for organic matters is discussed as well. In the meantime, regional and water-quality water shortages have also been proven to be the bottlenecks for imposing restrictions on the development of the society and economy after land and energy.

Abstract: In recent years, green computing which refers to maximize energy efficiency during the product's lifetime has attracted more and more concerns. How to use energy effectively in wireless communication systems is also an important issue. In this paper, we propose an energy efficient power control model for wireless communication systems. To control power consumption in wireless communication systems, we design a cross-layer optimization method by a cross layer optimizer which could collect status information from any protocol layer to make optimization decision and send parameter change request to the protocol layers. Experimental results illustrate the effectiveness of the proposed model.

Abstract: Due to the instability of the output in wind power, there exists some difficulties on wind power merger to electricity grid. The fast forecasting of output of wind power is in favor of reasonable allocation system and increase the possibility of power merger in a large scale. Based on the actual wind power data, this article utilizes the one order differential method to remove data unsteady and obtains the stable data. In view of the ARMA time series, a numerical prediction model of wind power output is established. The results show that the model has good precision and can be used in the production practice.

Abstract: Studying on the effect of different potassium fertilizers (KCl, KNO3, KH2PO4, K2SO4) based on pre-development environment friendly seed coating, which using chitosan as the main material. The results indicated that: 1) the best ratios of 4 potassium fertilizers in environment friendly seed coating , which was KCl, KNO3, KH2PO4, K2SO4, were from 0.025% to 0.05%, from 0.025% to 0.05%, from 0.025% to 0.075%, 0.025% respectively. And the high-to-low effect of coating rape seeds, based on environment friendly seed coating mixed different potassium fertilizers, was KNO3 > KH2PO4 > K2SO4 > KCl; 2) when mixed with environment friendly seed coating and used to coat rape seed, the synergistic effect between K and N in KNO3 was better than K and P in KH2PO4, and the above-mentioned two synergistic effects were better than K and S in K2SO4; 3) when the percent range of total weight of three elements (N, P, K) in environment friendly seed coating from 0.01% to 0.03%, the effect of rape seed germination was improved remarkable.

Abstract: Total permitted pollution discharge capacity (TPPDC) is a special scarce resource. The fairness and effectiveness of allocating TPPDC are the basis of pollutant gross control, pollution treatment and environmental sustainable development. Studies have demonstrated that free allocation, public auction and sale on wances are tree efficient and useful methods to allocate TPPDC. This paper presents widespread theoretical and applications problems for the study on these three methods in order to introduce the research history and the newest research trends of allocating TPPDC. Moreover, assumptions, main ideas, and conclusions of literature related to these three kinds of methods are reviewed and commented.