Advanced Materials Research Vol. 402

Abstract: Productivity simulation of multiple-fractured horizontal wells is the core technique during optimizing fracture’s amount and parameters. According to the dissymmetric double wings of multiple fractured high productivity horizontal gas well which is equality discreted, applying the theory of point source, the formula of unsteady seepage of gas and the principle of superposition, this paper deduce the model of overall pressure drop in formation considering the mutual interference of multi fracture. Besides, considering the high velocity non-Darcy’s flow’s effect to the fracture productivity in high horizontal gas well, establishing a more sophisticated new model to stimulate the fracture productivity in horizontal gas well. Via stimulation calculating and comparative analysing the high velocity non-Darcy’s flow, the dissymmetry of the double wings fracture, the length of fracture and the conductivity’s effect on the multiple fracture gas well’s productivity. This offers a more accurate method to optimizing the fracture’s amount in landscape and the parameters of fracture in high productivity gas well and making sure the proper production’s differential pressure.

Abstract: The coal gangue was activated by calcine activation, calcine activation + mechanical activation (MA) complex activation. From the results of O₂-TPO-MS and Ar-TPR-MS, we can speculate the reactions occurred during the coal gangue calcine activation processing. Effects of calcine temperature, calcine activation + MA complex activation, kinds of acid on the extraction percent of Al were investigated. The results of the extraction percent of Al and particle size analysis show that calcine (400~600 oC) activation and calcine (400~600 oC) + MA complex activation can enhance the extraction percent of Al and decrease the particle size. Much higher extraction percent of Al can be obtained with H₂SO₄ as acid medium than with HCl as acid medium for the coal gangue activated with the same condition.

Abstract: An optimization model for multi-source pumping tree-type pipe network is established, in which the investment and operating cost are considered simultaneously. Useing graph theory knowledge, the essence of pipe layout optimization for multi-sources tree-type pipe network is searching for a group of optimal subtrees. In the complete optimization of pipe network, the pipe layout mode and pipe diameter are needed to optimize simultaneously, so the dual coding genetic algorithm combining binary coding with integer coding is adopted, and the pipe diameter restriction is satisfied automatically. According to the tree character, method based on cycle is adopted in the operational process of binary coding, the partheno-genetic operation is designed to produce new individual, the infeasible solutions are avoided. Example shows the efficiency of the algorithm.

Abstract: For improving compaction process, a method of double-frequency composed vibrating compaction was proposed, which based on resonance and antifriction principle. The method was different from the traditional variable-frequency and variable-amplitude compaction method, which has one frequency and associated amplitude. Double-frequency composed vibrating compaction method has two different frequencies and associated amplitudes simultaneously, thus enhanced resonance and antifriction of asphalt mixture, and large amplitude oscillation was prone to deep transmission of impact energy. The results showed that double-frequency composed vibrating compaction machine got higher degree of compaction than that of traditional machine with same tonnage, 2.6% higher in surface layer and 3.1% higher at the position 15 cm far from surface. Double-frequency composed vibrating compaction method was better than traditional method in concerned with the compactness in layers, and had obviously advantage of deep compaction.

Abstract: The adsorption of organic pollutants from the waste water in the Beijing Shougang Coking Plant has been studied using bentonite modified by cetyl trimethyl ammonium bromide (CTMAB) in this experiment. The factors that affected the adsorbing capacity are amount of modifier, amount of sorbent, reaction time and grain size of organobentonite through a series of dynamic experiments. The experimental results show that under the conditions: the grain size of organobentonite 150µm, amount of organobentonite 10g•L^-1, modifier 5g and the adsorption time 60min, the removal efficiency of group components and polycyclic aromatic hydrocarbons (PAHs) from the waste water can reach 90% above.

Abstract: Base on contact kinetics finite element theory, proceed secondary development of road wheel and pin mesh’s nonlinear dynamic contact analysis in LS-DYNA module, and carry out contrast of simulation analysis, achieved stress, strain and dynamic identities that caused by meshing impact in the whole meshing process, accord with practice, can instruct product practice design.

Abstract: This study used 45 permanent sample plots investigated in 2007 and 6 permanent sample plots investigated in 2008 in Mao’er Mountain natural secondary forest area and 68 permanent plots investigated in 2008 in Niuxinshan institute in Muling. Through making the chat of diameter distribution histogram the analysis of diameter distribution, use a variety of distribution functions to fit the transformation regularities, set up parameter regression model. Research results show: the fitting effects of exponential distribution and Weibull distribution are good, and exponential distribution is better. Observing each parameter variation of exponential distribution function, find the relationship between parameters and stand description factor. Through the analysis, select the appropriate functions to fit them. Finally obtain the general diameter distribution function of natural secondary distribution function

Abstract: Through the metallurgical testing on a lot of samples from different parts of the heated slab and the finished product in heavy rail manufacturing process, analysis on the surface decarburization characteristics of U71Mn and U75V is carried out. Through analyzing the main affecting factors on the decarburization depth of heavy rail in the heating and rolling process, some effective means to reduce the product surface decarburization are put forward. The results show: (1) The surface decarburization depth distribution of heavy rail slab heated in the regenerative furnace is seriously imbalanced, and the fluctuation ranges between 30% -40%.(2) Under the same production conditions, decarburization of U75V is serious, and the average depth of U75V is more than 11% higher than the U71Mn. (3) The rolling process in the production of heavy rail has a great influence on the distribution of the surface decarburization depth. (4) Because the deformation rate of rectangle slab in the rolling process everywhere is different, in order to reduce the decarburization depth of finished product, it is useful to select the narrow surface of slab to generate the head of heavy rail, as well as to change the structure of the slab cross-section from right-angle to arc.

Abstract: The shale gas is becoming a new strategic energy source in the world. To improving the efficiency of exploration and production of such a non-conventional resource has been a global choice of oil and gas powers. Many previous researches have revealed that China has equivalent amount of shale gas reserves as USA. China-based research has shown that the southern China is one of the most potential areas for shale gas exploration. However, the complex topography with carbonate covers and sophisticated geological structures in southern China is a main difficulty for seismic exploration to get reliable and high-resolution data. This paper alternatively present electromagnetic exploration methods that are applicable to shale gas exploration in such rugged area.

Abstract: In traditional CAD technology, it is mainly to express the geometric information of parts, but can not express non-geometric information, such as weight, strength, and can not do the design of geometric distortion for changed topology. The combination of knowledge-based engineering (KBE) and CAD solved these problem in the filed of molding. NX/KF is a new technology to integrate CAD and KBE. This paper develops the mould parts with NX/KF as an example to explain its application. It analyzes the substance of parametric design and point out the developing direction of CAD by analyzing new characteristics of knowledge fusion.