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依托新情境、基于新技术的课堂实践——智慧课堂,深度融合,以“铁及其化合物的应用”为例 被引量:3
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作者 张磊 董金水 《化学教与学》 2020年第6期43-48,共6页
课堂管理和创设有效的教学情境是提高课堂教学效率的两个重要支撑,是基于课程标准的教学活动的有效落实,以苏教版高中化学1必修"铁、铜及其化合物"为例,将教学情境设计和基于平板电脑的"匡园深学系统"教学管理纳入... 课堂管理和创设有效的教学情境是提高课堂教学效率的两个重要支撑,是基于课程标准的教学活动的有效落实,以苏教版高中化学1必修"铁、铜及其化合物"为例,将教学情境设计和基于平板电脑的"匡园深学系统"教学管理纳入其中,使学生的学习处于一种新情境、新科技相互交融的状态,以提高化学课堂教学的有效性。 展开更多
关键词 深学系统 情境 课堂管理
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Dynamics analysis of planar armored cable motion in deep-sea ROV system 被引量:3
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作者 全伟才 张竺英 张艾群 《Journal of Central South University》 SCIE EI CAS 2014年第12期4456-4467,共12页
The armored cable used in a deep-sea remotely operated vehicle(ROV) may undergo large displacement motion when subjected to dynamic actions of ship heave motion and ocean current. A novel geometrically exact finite el... The armored cable used in a deep-sea remotely operated vehicle(ROV) may undergo large displacement motion when subjected to dynamic actions of ship heave motion and ocean current. A novel geometrically exact finite element model for two-dimensional dynamic analysis of armored cable is presented. This model accounts for the geometric nonlinearities of large displacement of the armored cable, and effects of axial load and bending stiffness. The governing equations are derived by consistent linearization and finite element discretization of the total weak form of the armored cable system, and solved by the Newmark time integration method. To make the solution procedure avoid falling into the local extreme points, a simple adaptive stepping strategy is proposed. The presented model is validated via actual measured data. Results for dynamic configurations, motion and tension of both ends of the armored cable, and resonance-zone are presented for two numerical cases, including the dynamic analysis under the case of only ship heave motion and the case of joint action of ship heave motion and ocean current. The dynamics analysis can provide important reference for the design or product selection of the armored cable in a deep-sea ROV system so as to improve the safety of its marine operation under the sea state of 4 or above. 展开更多
关键词 armored cable cable dynamics deep-sea remotely operated vehicle(ROV) resonance-zone geometrically exact model Newmark method
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Analysis of microseismic activity in rock mass controlled by fault in deep metal mine 被引量:2
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作者 Liu Jianpo Liu Zhaosheng +2 位作者 Wang Shaoquan Shi Changyan Li Yuanhui 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第2期235-239,共5页
Aiming at evaluating the stability of a rock mass near a fault,a microseismic(MS) monitoring system was established in Hongtoushan copper mine.The distribution of displacement and log(/),the relationship between MS ac... Aiming at evaluating the stability of a rock mass near a fault,a microseismic(MS) monitoring system was established in Hongtoushan copper mine.The distribution of displacement and log(/),the relationship between MS activity and the exploitation process,and the stability of the rock mass controlled by a fault were studied.The results obtained from microseismic data showed that MS events were mainly concentrated al the footwall of the fault.When the distance to the fault exceeded 20 m,the rock mass reached a relatively stable state.MS activity is closely related to the mining process.Under the strong disturbance from blasting,the initiation and propagation of cracks is much faster.MS activity belongs in the category of aftershocks after large scale excavation.The displacement and log(C/) obtained from MS events can reflect the difference in physical and mechanical behavior of different areas within the rock mass,which is useful in judging the integrity and degradation of the rock mass. 展开更多
关键词 Deep mining Fault Microseism(MS) Stability
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Development of a Cooling System for Geothermal Borehole Probes
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作者 Benedict Holbein Joerg Isele 《Journal of Earth Science and Engineering》 2014年第2期73-79,共7页
The high potential of geothermal energy in quantity and availability can be a great option, facing the huge problem of growing energy use linked with the climatic problems. Therefore, it is necessary to reduce costs a... The high potential of geothermal energy in quantity and availability can be a great option, facing the huge problem of growing energy use linked with the climatic problems. Therefore, it is necessary to reduce costs and risks for the use of geothermal energy sources. Because most of the problems have to do with insufficient knowledge about the conditions in the earth crust, the key to take root of geothermal energy is widespread research. The cooling system allows the use of all needed devices in deep boreholes without strict time or temperature limitations, which promotes the achieving of comprehensive information. To develop the purpose-built components among conducting experiments about the thermodynamic processes, a prototype is provided step by step. 展开更多
关键词 MONITORING heat protection borehole tools engineering.
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