Wang H.-Y.,Inner Mongolia University of Science and Technology |
Wang H.-Y.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources |
Gao X.-Y.,Beris Engineering and Research Corporation |
Ren H.-P.,Inner Mongolia University of Science and Technology |
And 3 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2014
The α-Fe Σ3 (112) symmetrical tilt grain boundary model is established by the coincidence site lattice theory. First-principles plane wave ultrasoft pseudopotential method based on the density functional theory is used to calculate the La occupying tendency in α-Fe. The results show that La elements tend to be located at grain boundary in the α-Fe since the impurity formation energy keeps lowest. On this basis, the electronic structure of La doped in α-Fe grain boundary is also calculated. The results indicate that the charges in the system are redistributed to provide more electrons for the grain boundary bonding when the La occupies α-Fe grain boundary. Meanwhile, Fe atoms obtain more electrons, and the La doped region combination has the ion-tendency toward strengthening the interaction between La atom and Fe atoms in the adjacent boundary region, and the Fe atom bonds in the grain boundaries and on both sides of the grain boundary also strengthen, which is the reason why the mechanical properties change from the energy point of view. Moreover, La addition also makes the atomic density of states on the grain boundary move to the left, reduce the total energy of the system, and make the grain boundary more stable. © 2014 Chinese Physical Society.
Gao X.,Inner Mongolia University of Science and Technology |
Gao X.,Beris Engineering and Research Corporation |
Ren H.,Inner Mongolia University of Science and Technology |
Li C.,Inner Mongolia University of Science and Technology |
And 4 more authors.
Journal of Alloys and Compounds | Year: 2016
The impurity diffusivities of rare earth elements, Y, La and Ce, in bcc Fe have been investigated by the first-principles calculations within nine-frequency model. The microscopic parameters in the pre-factor and activation energies have been calculated. For the three elements, the first nearest-neighbor solute-vacancy interactions are all attractive, in which Y and La solute atoms more favorably bond to the vacancy. The solute-vacancy binding energy can be explained in terms of the combination of the distortion binding energy and the electronic binding energy, and the decomposition results of the total solute-vacancy binding energy suggest that the strain-relief effect accounts for larger portion of the binding energy for Y and La than that for Ce. The diffusion coefficients of Y are one order of magnitude larger than that of La, and predicted to be comparable to that of Fe self-diffusion. Compared with Y and La, Ce shows large migration energy and small solute-vacancy attractive interaction, which accounts for the lowest diffusivity of this element. © 2015 Elsevier B.V. All rights reserved.
Feng K.,BERIS Engineering and Research Corporation |
Yang Y.-C.,Ocean University of China |
Zheng Y.,Shandong Academy of Sciences
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013
An improved damage inspection method based on axial modal strain energy ratio was presented for identifying a crack in a three-dimensional truss structure. The improved method was used to predict the existence and the approximate location of a crack by using only the first two order modal parameters without any rotational DOF degree information. With the finite element model of a jacket platform, several damage cases of its different members were simulated numerically to verify the index of axial modal strain energy ratio. This method was also verified with a physical model test for a jacket platform. The final results showed that the proposed axial modal strain energy ratio method can effectively diagnose three-dimensional truss structure's damage.
Shi Y.,CAS Research Center for Eco Environmental Sciences |
Zhang W.,CAS Research Center for Eco Environmental Sciences |
Ren J.M.,Institute of Strategic Environmental Assessment |
Zhang J.P.,BERIS Engineering and Research Corporation
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2015
Ecological suitability analysis is an important method of applying ecological principles to guide rational spatial distribution and regional development for the planning of certain areas. This method has been widely applied in urban and regional ecological planning. However, due to the lack of systematic assessment methodologies, it has not been significantly promoted for spatial siting, ecological planning, or eco-environmental impact assessments of ecologically sensitive areas, such as nature reserve areas and tourism areas. This study proposes the use of an ecological suitability analysis method and a GIS-based mapping approach to develop an eco-tourism project in an ecologically sensitive montane area. We use the Wudangzhao Scenic Area in Inner Mongolia, China, as a case study for analyzing various ecological factors including topography, slope, aspect, soil organic environment, vegetation cover, river hydrology, geology and lithology. These factors reflect the four typical ecologically sensitive elements of erosion prevention, geological disasters prevention, biodiversity protection, and flood control. We first completed the ecological sensitivity assessment and spatial suitability mapping using both single and integrated eco-sensitive factors. We then superimposed the distribution of relevant tourism projects in the research area in relation to the eco-sensitive assessment results in the form of an eco-map. Finally, we suggest specific ecological risk prevention and protective measures for tourism development and spatial planning in the research area. In addition, this method provided a comprehensive overview of all ecologically sensitive characteristics for mountain based tourism projects currently being developed, spatially displaying them through ecological mapping. Therefore, this method contributes to a more effective decision-making process and helps decision makers develop more appropriate regulatory measures to prevent ecological risk. In conclusion, this method provides a scientific and effective technical tool to assess the ecological environmental impact of a project or planned projects in this type of eco-sensitive region. © 2015, Ecological Society of China. All rights reserved.
Li Z.,BERIS Engineering and Research Corporation |
Yan L.,Inner Mongolia University of Technology |
Shen J.,General Research Institute for Nonferrous Metals, China
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013
The hot compression simulation of 7055 aluminum alloy was carried out on the Gleeble-1500D thermal simulator. The characteristics of hot compressive structure under different reductions was observed by OM and EBSD. The mechanical properties after heat treatment were tested, and the effects of hot deformation reduction on the microstructure and mechanical properties of 7055 aluminum alloy were investigated. The experimental results indicate that with the increase of reduction, the grains are significantly elongated, and the coarse second phase are stretched along the grain boundaries, and even broken up. Dynamic recrystallization locally occurs in 7055 aluminum alloy, which is attributed to strain-induced grain boundary migration. With the decrease of the volume fraction of recrystallization and the increase of grain contained sub-structure in 7055 aluminum alloy after heat treatment, mechanical properties of the alloys are improved greatly. The optimum mechanical properties can be obtained with the 79% reduction.
Feng H.,China University of Petroleum - East China |
Yang X.,China University of Petroleum - East China |
Wang M.,Beris Engineering and Research Corporation |
Liu D.,China University of Petroleum - East China
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2014
According to the transformation regularity of fuel energy in the gasoline engine combustion process with blended gasoline, the fuel blending component model and the thermodynamic quasi-dimensional two-zone model were established. The changes of availability and loss of irreversibility as a function of crank angle during the combustion process with straight run gasoline and catalytic cracking gasoline were studied by numerical simulation respectively. In the fuel blending component model, i-octane, n-heptane, methyl cyclohexane and toluene were treated as the substitute for straight run gasoline components, simultaneously, i-octane, n-heptane, methyl cyclohexane, toluene and 1-pentene as the substitute for catalytic cracking gasoline. The results show that the total exergy destruction of the catalytic cracking gasoline (36.01%) was lower than that of the straight run gasoline (about 40.07%). During the combustion process, the exergy destruction of the catalytic cracking gasoline due to heat transfer was larger than that of the straight run gasoline, while the exergy destruction due to combustion was smaller. The differences of the exergy destruction during the combustion process appear to be related to the kind and content of the hydrocarbon compositions in the blended gasoline.
Liang Y.F.,University of Science and Technology Beijing |
Ge J.W.,University of Science and Technology Beijing |
Ge J.W.,Beris Engineering and Research Corporation |
Fang X.S.,University of Science and Technology Beijing |
And 2 more authors.
Materials Science and Engineering A | Year: 2013
Hot deformation behavior of Fe-6.5. wt% Si alloy is studied by hot compression in the temperature range of 773-1373. K with different strain rates. It is found that dynamic recrystallization is the main softening mechanism in disordered phase regions in 1073-1373. K, while dynamic recovery is the main softening mechanism in ordered phase regions in 773-973. K. The strain rate sensitivity increases with temperature in 773-973. K, while decreases in 1073-1373. K. The apparent activation energy is calculated to be 211. kJ/mol in 1073-1373. K and 478. kJ/mol in 773-973. K. The function between steady flow stress and Zener-Hollomon parameter is deduced. Moreover, the relationship between steady flow stress and the grain size after deformation is presented the Hall-Petch relation. © 2013 Elsevier B.V..
Zhang Z.,Changsha University |
Feng J.,BERIS Engineering and Research Corporation |
Zhang H.,Changsha University
Proceedings - 2012 International Conference on Intelligent Systems Design and Engineering Applications, ISDEA 2012 | Year: 2012
This paper proposes a new kind of parallel integer addition algorithm - the barrel integer addition algorithm on the basis of researching the structure of half adder. It also elaborates the principle and structure of barrel integer addition algorithm, analyses the time and the degree of complexity in the area of the algorithm and at the same time compares it with the traditional integer addition algorithm. We realized that the 16-bit barrel integer adder using Verilog HDL and verifies comprehensively in the Altera device. The result shows that the speed of the barrel integer adder designed in this paper improves obviously on the basis of a small increase of area, which lays the foundation for the improvement of the multiplier performance. © 2012 IEEE.
Sun D.,Yanshan University |
Zhang Y.,Yanshan University |
Zha X.,Beris Engineering and Research Corporation |
Liu W.,Beris Engineering and Research Corporation |
And 2 more authors.
Applied Mechanics and Materials | Year: 2010
The key technology of the liquid core heavy reduction rolling mill relates to the roller's normal life cycle in a bad work condition. It is the guarantee of continuous production. This paper simulated and calculated the two roller types which are built-up welding roller and roll-sleeve type roller, material of the rollers is H13 (4Cr5MoV1Si) which has better synthetical mechanical properties. It also calculated the fatigue life under the steady temperature, stress and strain fields after rolling for five cycles though the strain-life method. © (2010) Trans Tech Publications.
Dengyue S.,Yanshan University |
Yuanfang Z.,Yanshan University |
Xianwen Z.,Beris Engineering and Research Corporation |
Wenwu L.,Beris Engineering and Research Corporation |
Huiwen M.,Beris Engineering and Research Corporation
Applied Mechanics and Materials | Year: 2010
The key technologies of heavy reduction on liquid core of thick slab rolling mill are designing the roller structure and the selection of high temperature high strength materials. This paper using finite element analysis method compared the temperature field, thermal stress field and strain field. Two material 2Cr12NiMoWV and 5Cr4W5Mo2V and two structures which is roll-sleeve and built-up welding roll in rolling process are analyzed. The results show that the 5Cr4W5Mo2V roll-sleeve type roller has advantages. © (2010) Trans Tech Publications, Switzerland.