Thulium(Tm)atoms are resonantly ionized in a hot tube by stepwise excitations us-ing three dye lasers pumped by a series of copper vapor pulsed at a 10 kHz rate.The chemicalselectivity of the laser ion source is measu...Thulium(Tm)atoms are resonantly ionized in a hot tube by stepwise excitations us-ing three dye lasers pumped by a series of copper vapor pulsed at a 10 kHz rate.The chemicalselectivity of the laser ion source is measured as a function of temperature of the tubes made ofTa,Nb-Zr and TaC.The chemical selectivity rises from 50 to 10000 with decreasing tube temp-erature and strongly depends on the tube material.A chemical selectivity of about 10000 withhigh efficiencies is obtained with the Nb-Zr and TaC tubes.Such a laser ion source can be usedin on-line mass separator to obtain isobarically pure ion beams.展开更多
Elective course selection has always been a serious and important decision making process for students in institutions. The aim of this study is to determine weights of factors affecting elective course selection from...Elective course selection has always been a serious and important decision making process for students in institutions. The aim of this study is to determine weights of factors affecting elective course selection from students' perspective. So as to solve the problem, Analytic Hierarchy Process (AHP) based model was used. Factors which affect the elective course selection from students' point of view include five main criteria and 13 sub-criteria which were indicated by students. An online questionnaire containing demographic questions, enabled each student to compare the relative priority of criteria with all of the other criteria. The responses were evaluated via Super Decisions software, and priorities were determined using the Analytic Hierarchy Process (AHP). According to the analysis of 40 experts (i.e., graduate students studying in engineering programs), course schedule and teaching staff related factors are the two most important factors affecting the elective course selection. A real- life situation which will help students who are indecisive and hesitates while selecting an elective course was observed. AHP contributes to develop an analytic and comprehensive framework decision making. The method should be considered by faculty member involved in decisions about curriculum update and offering new courses.展开更多
College English Curriculum Requirements poses a great challenge for college English teaching. One way to deal with the status quo is to offer selective courses to non-English majors. This article gives an early probe ...College English Curriculum Requirements poses a great challenge for college English teaching. One way to deal with the status quo is to offer selective courses to non-English majors. This article gives an early probe into the rationale on a new course-designing practice as well as a detailed introduction to an illustrative course. As proved, the attempt to practice selective courses is feasible and effective for individualized teaching and integrated language competence cultivation.展开更多
Online learning is becoming more and more popular among college students.College courses are going online recently but seldom have a systematic structure.In an attempt to testify the effect of online learning of the E...Online learning is becoming more and more popular among college students.College courses are going online recently but seldom have a systematic structure.In an attempt to testify the effect of online learning of the English language,a research is carried out by running a selective course of Campus English online.The whole process of the course is running online.A Wechat group is set up for the purpose of supervision.Each unit has an assignment to follow.Through finishing these assignments,the skills of listening,speaking,reading and writing are all practiced.To test the students’learning outcome,the instructor only needs to check their assignments.Feedback is offered to the students as soon as the teacher has corrected the assignments.After the twenty-class-hour learning,a survey is carried out to find out the student’s further needs and satisfaction level.The result of the survey shows that the students are quite satisfied with this form of online learning.Some advice is also offered by them to contribute to the further improvement of this online course.This research has shed some light on further improvement of online course.展开更多
基金The project supported by Chinese Academy of Sciences
文摘Thulium(Tm)atoms are resonantly ionized in a hot tube by stepwise excitations us-ing three dye lasers pumped by a series of copper vapor pulsed at a 10 kHz rate.The chemicalselectivity of the laser ion source is measured as a function of temperature of the tubes made ofTa,Nb-Zr and TaC.The chemical selectivity rises from 50 to 10000 with decreasing tube temp-erature and strongly depends on the tube material.A chemical selectivity of about 10000 withhigh efficiencies is obtained with the Nb-Zr and TaC tubes.Such a laser ion source can be usedin on-line mass separator to obtain isobarically pure ion beams.
文摘Elective course selection has always been a serious and important decision making process for students in institutions. The aim of this study is to determine weights of factors affecting elective course selection from students' perspective. So as to solve the problem, Analytic Hierarchy Process (AHP) based model was used. Factors which affect the elective course selection from students' point of view include five main criteria and 13 sub-criteria which were indicated by students. An online questionnaire containing demographic questions, enabled each student to compare the relative priority of criteria with all of the other criteria. The responses were evaluated via Super Decisions software, and priorities were determined using the Analytic Hierarchy Process (AHP). According to the analysis of 40 experts (i.e., graduate students studying in engineering programs), course schedule and teaching staff related factors are the two most important factors affecting the elective course selection. A real- life situation which will help students who are indecisive and hesitates while selecting an elective course was observed. AHP contributes to develop an analytic and comprehensive framework decision making. The method should be considered by faculty member involved in decisions about curriculum update and offering new courses.
文摘College English Curriculum Requirements poses a great challenge for college English teaching. One way to deal with the status quo is to offer selective courses to non-English majors. This article gives an early probe into the rationale on a new course-designing practice as well as a detailed introduction to an illustrative course. As proved, the attempt to practice selective courses is feasible and effective for individualized teaching and integrated language competence cultivation.
文摘Online learning is becoming more and more popular among college students.College courses are going online recently but seldom have a systematic structure.In an attempt to testify the effect of online learning of the English language,a research is carried out by running a selective course of Campus English online.The whole process of the course is running online.A Wechat group is set up for the purpose of supervision.Each unit has an assignment to follow.Through finishing these assignments,the skills of listening,speaking,reading and writing are all practiced.To test the students’learning outcome,the instructor only needs to check their assignments.Feedback is offered to the students as soon as the teacher has corrected the assignments.After the twenty-class-hour learning,a survey is carried out to find out the student’s further needs and satisfaction level.The result of the survey shows that the students are quite satisfied with this form of online learning.Some advice is also offered by them to contribute to the further improvement of this online course.This research has shed some light on further improvement of online course.
