Applied Mechanics and Materials Vols. 423-426

Abstract: Cross-linked chitosan adsorbents were prepared by modification of chitosan with epichlorohydrin under alkaline conditions. It was showed that chitosan had cross-linked with epichlorohydrin by infrared spectrum analysis. Using scanning electron microscopy, it was observed that the roughness increased and granular material exhibited on the cross-linked chitosan adsorbents surface. Using Congo red solution as simulated dye wastewater, the adsorption properties of cross-linked chitosan adsorbent were detected. The results showed that the adsorption capacity of the cross-linked chitosan adsorbents for Congo red was higher than that of chitosan.

Abstract: Differential Scanning Calorimetry (DSC) is a common and useful method for thermal analysis. This paper briefly introduces the thermal decomposition characteristic determination of the main components of propellant by DSC assay and the applications of DSC in thermal stability and compatibility evaluation research of energetic materials.

Abstract: Cu doped Bi_1.5Pb_0.5Sr_1.8La_0.2Co_2-xCu_xO_y (x = 0.0, 0.2, 0.4) samples were prepared through the solid state reaction method. The influence of different Cu doping contents on electrical resistivity, Seebeck coefficients, thermal conductivity, and the dimensionless figure of merit ZT was investigated. All the samples of Cu concentration 0.4 are single phases. The electrical resistivity of Bi_1.5Pb_0.5Sr_1.8La_0.2Co_1.8Cu_0.2O_y descends, and its ZT values are enhanced obviously. The results show that suitable element doping can modify the electric transport properties and enhance thermoelectric properties of materials.

Abstract: The effect of carbon concentration on SiC crystal growth from melt at 2900 K has been investigated by molecular dynamics simulations. The inter-atomic forces are calculated by MEAM potential. Atomic layer density showed that, with the carbon concentration increasing in the range of 1%-70%, the SiC crystal growth rate increased first as the c concentration less than 45%, and then decreased as the c concentration more than 50%. The number of defected atoms showed that the SiC crystal growth rate had exponent relation to the C concentration both during increasing and decreasing process.

Abstract: In this paper, application of dividing wall column (DWC) to industrial naphthalene was studied. Simulation using Aspen plus software was done to compare the traditional twin furnace and twin column (TFTC) process with new process based on DWC. The results show that, with the same feed parameters, the DWC processes can achieve identical separation effect as the TFTC process with an energy saving of 21.6%, and capital investment and space saving can also be gained. So the simulation results indicate that a DWC would be a beneficial alternative to conventional TFTC configuration for industrial naphthalene distillation.

Abstract: In the present research work, volatile matter, influences of reaction temperature and particle size on combustion performance were investigated. Important results were obtained by experimental researches. Ignition point of anthracite coal/bituminous coal blends decreased with volatile matter in blend and combustion was improved. Burnout of coal blends decreased as a function of particle size. However, similar effects were gained when particle size less than 0.074mm accounted for 70%, 60% and 50%, respectively. By contrast, the ratio of 50% was a better choice for good effect and low cost.

Abstract: In order to improve the development effectiveness of tight gas reservoirs, in this paper, the adaptability study of well type for developing tight gas reservoirs using horizontal wells was conducted in view of the characters of tight gas reservoir, and the well type optimization model for different reservoirs was proposed. The development effectiveness of the different well type for different reservoirs was put forward, and the adaptability of different well type for different reservoirs was obtained. The basic foundation and method of well type optimization for tight gas reservoirs was obtained.

Abstract: The sand of 8th Member of Lower Shihezi Formation in Sulige Gas-field is thick and has complex structure. The reservoir lateral changes quickly and effectively lower reservoir drilling. Through outcrop, modern river sediments and core observation, the composite river fancies types, sedimentary characteristics,the reservoir internal structure, spatial overlay mode and developmental scale of the 8th Member of Lower Shihezi Formation are studied to deepen the understanding of the reservoir, deployment and guidance of exploration.

Abstract: Through the Conventional pressure mercury experiment, the pore structure characteristics of the Class II reservoirs were studied in Daqing, and the conventional mercury penetration experiment date of 26 natural cores of Class II reservoirs were obtained, the pore volume, permeability contribution and pseudo pore-throat ratio distribution of different pore radius interval in Class II reservoirs were analyzed, the distribution characteristic of pore radius, throat radius and pore-throat ratio of Class II reservoirs were researched. The results showed that more than 60% of the Class II reservoirs pore volume distributed in the pore radius interval from 0.1μm to 5μm, the range of pore-throat ratio was 1.5~89.5. Therefore the reservoir space range of Class II reservoirs was from 0.1μm to 5μm.

Abstract: By means of MTS electro-hydraulic servo system, specimens from deep coal mine rock are conducted the permeability characteristics experiment under the condition of the stress-strain process and high pore-water pressure, also the results show that both the permeability rate and volumetric strain curves are V shaped, which link the dynamic changes of the microscopic fracture porosity and corresponds with the stress-strain. Meanwhile, under certain external conditions, whether the change of the pore-water pressure can improve the permeability properties or not, it depends on the critical threshold, moreover, the permeability properties under pore-water pressure higher than critical threshold have been improved several times than that at low pore-water pressure, and the peak of strain-permeability rate has a corresponding change with the peak of stress-strain curve, which shows a hysteretic characteristic. The higher the pore-water pressure is, the lower peak strength is needed, the more distinctive effects of dilatation emerge, and the more strain is needed for the appearance of permeability peak, This article provides the basis for the employment of high pore-water pressure to improve the permeability and disaster prevention of coal rock water injection.