Speaking skill is an important component in the student’s communicative competence.The testing of this skill is indispensable with its functions of providing useful feedback and motivating students.Where direct face-...Speaking skill is an important component in the student’s communicative competence.The testing of this skill is indispensable with its functions of providing useful feedback and motivating students.Where direct face-to-face oral test is impossible when large number of candidates involved,language lab or computer can be used to carry out various testing tasks in the evaluation of the students’ oral communicative competence.展开更多
Testing the ability to speak is a most important aspect of language testing, especially in terms of the student's communicative competence. However, it is an extremely difficult skill to test, as it is far too com...Testing the ability to speak is a most important aspect of language testing, especially in terms of the student's communicative competence. However, it is an extremely difficult skill to test, as it is far too complex a skill to permit any reliable analysis to be made for the purpose of objective testing. In addition, direct face-to-face oral test is impossible when large number of candidates involved, so language lab or computer can be used to carry out various testing tasks in the evaluation of the students' oral communicative competence. This paper aims to introduce briefly how to test speaking skill by language lab or computer.展开更多
The in situ shear test and in-lab triaxial shear test on compacted rockfill of Fuling safety embankment were carried out and their advantages and disadvantages were compared. The discreteness of cohesive force C and i...The in situ shear test and in-lab triaxial shear test on compacted rockfill of Fuling safety embankment were carried out and their advantages and disadvantages were compared. The discreteness of cohesive force C and internal frictional angle by in situ shear test is much severer than that by in-lab triaxial shear test. The consolidation of in-lab triaxial shear test is bigger than actual consolidation in rockfill engineerings, so the confining pressure should be reduced to a low level in-lab triaxial shear test.展开更多
High stress in surrounding rock will lead to serious problems,e.g.,rock burst in hard rock and large deformation in soft rock.The applied support system under high in-situ stress conditions should be able to carry hig...High stress in surrounding rock will lead to serious problems,e.g.,rock burst in hard rock and large deformation in soft rock.The applied support system under high in-situ stress conditions should be able to carry high load and also accommodate large deformation without experiencing severe damage.In this paper,a specially designed energy-absorbing component for rock bolt and cable that can solve the above problems was proposed.The energy-absorbing component can provide support resistance by plastic deformation of the metal including constraint annulus and compression pipe.For practical engineering,two forms were proposed.One was installed in the surrounding rock by reaming,and the other was installed directly outside the surrounding rock.During the dilation of the surrounding rock,the relative displacement of constraint annulus and compression pipe occurs,resulting in deformation resistance.Deformation resistance is transmitted to the rock bolt or cable,providing support resistance.The lab test and numerical simulation showed that the energy-absorbing component can perfectly achieve the large deformation effect,the deformation amount is as high as 694 mm,and the bearing capacity is stable at 367 kN.The field application tests were carried out in the mining roadway of Xinjulong coal mine,and the results showed that the new type of cable can ensure itself not to break under the condition of large deformation of the surrounding rock.The energy-absorbing component has the superiorities of performing large constant resistance and controllable deformation to effectively control the unpredictable disasters such as large deformation in soft rock and rock burst in hard rock encountered in deep strata.展开更多
对锂离子电池进行充放电测试,是研究其性能、安全性的基础。提出了一种基于Lab VIEW的单节锂离子电池通用充放电测试系统,利用上位机Lab VIEW软件控制可编程电源和电子负载进行电池充放电,利用NI my DAQ设备实现电池端电压、电流和温度...对锂离子电池进行充放电测试,是研究其性能、安全性的基础。提出了一种基于Lab VIEW的单节锂离子电池通用充放电测试系统,利用上位机Lab VIEW软件控制可编程电源和电子负载进行电池充放电,利用NI my DAQ设备实现电池端电压、电流和温度的采集,并且带有电池保护、数据记录和图形实时显示功能。该系统可根据用户需求完成恒流充放电、动态充放电等多种工况的测试,且数据采集精度满足电池性能研究的需求。展开更多
文摘Speaking skill is an important component in the student’s communicative competence.The testing of this skill is indispensable with its functions of providing useful feedback and motivating students.Where direct face-to-face oral test is impossible when large number of candidates involved,language lab or computer can be used to carry out various testing tasks in the evaluation of the students’ oral communicative competence.
文摘Testing the ability to speak is a most important aspect of language testing, especially in terms of the student's communicative competence. However, it is an extremely difficult skill to test, as it is far too complex a skill to permit any reliable analysis to be made for the purpose of objective testing. In addition, direct face-to-face oral test is impossible when large number of candidates involved, so language lab or computer can be used to carry out various testing tasks in the evaluation of the students' oral communicative competence. This paper aims to introduce briefly how to test speaking skill by language lab or computer.
基金SupportedbyChongqingScienceandTechnologyCommittee (No .2 0 0 1 74 2 9)andWesternCommunicationsProjectofMinistryofCommunications
文摘The in situ shear test and in-lab triaxial shear test on compacted rockfill of Fuling safety embankment were carried out and their advantages and disadvantages were compared. The discreteness of cohesive force C and internal frictional angle by in situ shear test is much severer than that by in-lab triaxial shear test. The consolidation of in-lab triaxial shear test is bigger than actual consolidation in rockfill engineerings, so the confining pressure should be reduced to a low level in-lab triaxial shear test.
基金partially funded by National Natural Science Foundation of China(Nos.52179098 and 41907251).
文摘High stress in surrounding rock will lead to serious problems,e.g.,rock burst in hard rock and large deformation in soft rock.The applied support system under high in-situ stress conditions should be able to carry high load and also accommodate large deformation without experiencing severe damage.In this paper,a specially designed energy-absorbing component for rock bolt and cable that can solve the above problems was proposed.The energy-absorbing component can provide support resistance by plastic deformation of the metal including constraint annulus and compression pipe.For practical engineering,two forms were proposed.One was installed in the surrounding rock by reaming,and the other was installed directly outside the surrounding rock.During the dilation of the surrounding rock,the relative displacement of constraint annulus and compression pipe occurs,resulting in deformation resistance.Deformation resistance is transmitted to the rock bolt or cable,providing support resistance.The lab test and numerical simulation showed that the energy-absorbing component can perfectly achieve the large deformation effect,the deformation amount is as high as 694 mm,and the bearing capacity is stable at 367 kN.The field application tests were carried out in the mining roadway of Xinjulong coal mine,and the results showed that the new type of cable can ensure itself not to break under the condition of large deformation of the surrounding rock.The energy-absorbing component has the superiorities of performing large constant resistance and controllable deformation to effectively control the unpredictable disasters such as large deformation in soft rock and rock burst in hard rock encountered in deep strata.
文摘对锂离子电池进行充放电测试,是研究其性能、安全性的基础。提出了一种基于Lab VIEW的单节锂离子电池通用充放电测试系统,利用上位机Lab VIEW软件控制可编程电源和电子负载进行电池充放电,利用NI my DAQ设备实现电池端电压、电流和温度的采集,并且带有电池保护、数据记录和图形实时显示功能。该系统可根据用户需求完成恒流充放电、动态充放电等多种工况的测试,且数据采集精度满足电池性能研究的需求。
