General English course at Iranian universities has always been a controversial issue since the students taking this course are rather weak in English proficiency and need more authentic instructions based on accurate ...General English course at Iranian universities has always been a controversial issue since the students taking this course are rather weak in English proficiency and need more authentic instructions based on accurate need analysis. The materials applied in this course are mainly focused on reading comprehension. Thus, the purpose of the present study was to improve General English university students＇ main sub-skills of reading comprehension and see the effect of the possible changes in terms of time and the fields of study of the students. To do this, 168 university students taking General English course at university of Bojnord, including humanities, engineering, physical education, and sciences, received instruction on the main sub-skills of reading comprehension after taking a pre-test sample TOELF section of reading comprehension. After 16 sessions of 90 minute instruction, they took the post-test section of TOEFL sample of reading comprehension. Mixed between within subject analysis of variance was used to assess the impact of instruction for the four groups of students from pre-test to post-test. The findings of the study indicated that the effect of instruction in terms of time, from pre-test to post-test, and the interaction of time and fields of study were significant. Besides, changes for 10 sub-skills were the same among the four fields of study.展开更多
Solenoid valve is one of the executive parts of weft insertion control system. According to the response characteristics of the solenoid valve, an improved design becomes a necessity. Firstly, the numerical model was ...Solenoid valve is one of the executive parts of weft insertion control system. According to the response characteristics of the solenoid valve, an improved design becomes a necessity. Firstly, the numerical model was established after analyzing the solenoid valve during its start-up and shut-down. Comparing the simulation data with the practical data, it is verified that the numerical simulation model has a high feasibility. Secondly, excitation voltage and spring pre-compression were adjusted respectively, and the response rules after adjusting were investigated. The research of the study shows: the response time tends to be inverse proportional to the excitation voltage during start-up, and it becomes a constant value with the increase of the excitation voltage; the response time is proportional to the spring pre-compression when the solenoid valve starts up, it is inverse proportional to spring pre-compression when the solenoid valve shuts down. And the total response time is a constant value with the increase of the spring pre-compression. Therefore, the value of the excitation voltage and the spring pre-compression should be selected when the curve is becoming flatten. The results of the research can provide the reference to the further development of the solenoid valve.展开更多
文摘General English course at Iranian universities has always been a controversial issue since the students taking this course are rather weak in English proficiency and need more authentic instructions based on accurate need analysis. The materials applied in this course are mainly focused on reading comprehension. Thus, the purpose of the present study was to improve General English university students＇ main sub-skills of reading comprehension and see the effect of the possible changes in terms of time and the fields of study of the students. To do this, 168 university students taking General English course at university of Bojnord, including humanities, engineering, physical education, and sciences, received instruction on the main sub-skills of reading comprehension after taking a pre-test sample TOELF section of reading comprehension. After 16 sessions of 90 minute instruction, they took the post-test section of TOEFL sample of reading comprehension. Mixed between within subject analysis of variance was used to assess the impact of instruction for the four groups of students from pre-test to post-test. The findings of the study indicated that the effect of instruction in terms of time, from pre-test to post-test, and the interaction of time and fields of study were significant. Besides, changes for 10 sub-skills were the same among the four fields of study.
基金supported by the National Natural Science Foundation of China(No.51006090)
文摘Solenoid valve is one of the executive parts of weft insertion control system. According to the response characteristics of the solenoid valve, an improved design becomes a necessity. Firstly, the numerical model was established after analyzing the solenoid valve during its start-up and shut-down. Comparing the simulation data with the practical data, it is verified that the numerical simulation model has a high feasibility. Secondly, excitation voltage and spring pre-compression were adjusted respectively, and the response rules after adjusting were investigated. The research of the study shows: the response time tends to be inverse proportional to the excitation voltage during start-up, and it becomes a constant value with the increase of the excitation voltage; the response time is proportional to the spring pre-compression when the solenoid valve starts up, it is inverse proportional to spring pre-compression when the solenoid valve shuts down. And the total response time is a constant value with the increase of the spring pre-compression. Therefore, the value of the excitation voltage and the spring pre-compression should be selected when the curve is becoming flatten. The results of the research can provide the reference to the further development of the solenoid valve.
