Time filter

Source Type

Gao Y.,Jiangsu Huayi Technology Co. | Xu Z.,Jiangsu Huayi Technology Co. | Wu K.,Tsinghua University | Wang X.,China Construction Installation Engineering Co. | And 2 more authors.
Chinese Journal of Chemical Engineering | Year: 2016

Accurate simulation of water distillation system for oxygen-18 (18O) isotope separation is necessary to guide industrial practice, since both deuterium (D) and oxygen-18 isotope get enriched and interfere with each other. In the present work, steady-state and dynamic distillation models are established based on a classic method and a cascade distillation system with 5 towers is introduced to test the models. The theoretical expressions of separation factor α H/D for protium/deuterium and separation factor α 16O/18O.for oxygen-16/oxygen-18 were derived, with the existence of deuterium and oxygen-18, respectively. The results of the steady-state simulation by the classical method proposed in the present work agreed well with the results of the lumping method. The dynamic process could be divided into 5 stages. Impressively, a peak value of product withdraw was observed before the final steady state, which was resulted from the change of 16O/18O separation factor and isotope distribution. An interesting low concentration zone in the towers of T2-T5 existed at the beginning of the dynamic process and it required industrial evidence. © 2016 Elsevier B.V. Source

Zhang L.-X.,Northeastern University China | Fu J.-Y.,Northeastern University China | Jiang H.-T.,China Construction Installation Engineering Co. | Che L.-N.,Northeastern University China
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2016

Focused on six regional central cities (RCCs) which play such roles as leading, radiation, distribution, an indicator system is constructed for evaluating RCCs' competitiveness of sci-tech human resources, and then the competitiveness is evaluated by using the analysis method of conforming to natural rules based on the individual advantages and characteristics, with the RCCs' competitiveness advantages and their ranking clarified. On the basis, the relevant government departments can develop sci-tech human resource planning and related policies to upgrade the competitiveness of sci-tech human resources of RCCs in China. © 2016, Editorial Department of Journal of Northeastern University. All right reserved. Source

Wu M.-B.,China University of Petroleum - East China | Li L.-Y.,China University of Petroleum - East China | Li L.-Y.,China Construction Installation Engineering Co. | Liu J.,China University of Petroleum - East China | And 4 more authors.
Xinxing Tan Cailiao/New Carbon Materials | Year: 2015

Mesoporous carbon (MC) was prepared from rice husk (RH) by a simple and template-free method which combines H3PO4 activation with a pretreatment of the RH with a NaOH solution and pre-oxidation in air. The pretreatment of RH with NaOH removes silicon and damages the crystal structure of the cellulose in the RH, both of which are beneficial to the preparation of MC with a high surface area and high mesoporosity. The MC has a specific surface area of 2 009 m2·g-1 and a mesoporosity of 90.8%. Its specific capacitance can reach 176 F·g-1 at a current density of 50 mA·g-1, and a value of 126 F·g-1 is retained at 1 000 mA·g-1, indicating an excellent rate capability. A MC electrode has a stable specific capacitance of about 150 F/g at 200 mA·g-1 with no apparent capacitance fade after 1 000 cycles, indicating good electrochemical stability. © 2015, Editorial Board of New Carbon Materials. All right reserved. Source

Wang H.,Harbin Institute of Technology | Qian H.,Harbin Institute of Technology | Fan F.,Harbin Institute of Technology | Zhang F.,Harbin Institute of Technology | And 3 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

Key issues in construction process of hyper-hemispherical single-layer spherical shell in Hangzhou International Expo Center were investigated. According to the structural features and construction requirements, the sub-section or sub-block installing construction scheme was adopted, and the mechanical properties of standard unit in the lifting process were analyzed. The construction simulation model of the whole structure was established with the developed simulation technique of the construction full-process. The full-process analysis of installing and uninstalling schemes was carried out for obtaining the mechanical response law. The results indicate that stress levels of hoisting units are relatively low and components have elastic deformation during the hoisting process, both of which can guarantee the construction safety and assembly accuracy. In the process of assembling and uninstalling, the maximum stress ratio is less than 0.3, and deformation can meet the requirements of related specification. The construction schemes are reliable. The results can not only provide the theoretical guidance of construction safety and precision control, but also accumulate experience for the construction. Source

Fan F.,Harbin Institute of Technology | Wang Z.,Harbin Institute of Technology | Wang H.,Harbin Institute of Technology | Qian H.,Harbin Institute of Technology | And 3 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

By comparing several erection methods of streamer grid structure of Hangzhou International Expo Center, the structure division erection scheme was determined. Hoisting state of block element was simulated in static analysis method. The analysis model for hoisted structure division unit, which is based on the principle of the coincidence between the center of gravity and the intersection of hoisting points, was established to obtain structure response under the condition of different hoisting points or cable length. Furthermore, reasonable hoisting scheme was obtained based on stress ratio, vertical displacement of node, cable length and cable force. The results of analysis indicate that both force and definition methods of calculating center of gravity position are viable and which one to be used depends on the construction situation. The hoisting point position should be arranged evenly around the center of gravity. The cable length can be determined by construction condition. Source

Discover hidden collaborations