Refinery scheduling attracts increasing concerns in both academic and industrial communities in recent years.However, due to the complexity of refinery processes, little has been reported for success use in real world...Refinery scheduling attracts increasing concerns in both academic and industrial communities in recent years.However, due to the complexity of refinery processes, little has been reported for success use in real world refineries. In academic studies, refinery scheduling is usually treated as an integrated, large-scale optimization problem,though such complex optimization problems are extremely difficult to solve. In this paper, we proposed a way to exploit the prior knowledge existing in refineries, and developed a decision making system to guide the scheduling process. For a real world fuel oil oriented refinery, ten adjusting process scales are predetermined. A C4.5 decision tree works based on the finished oil demand plan to classify the corresponding category(i.e. adjusting scale). Then,a specific sub-scheduling problem with respect to the determined adjusting scale is solved. The proposed strategy is demonstrated with a scheduling case originated from a real world refinery.展开更多
In furtherance of their most recent research on the textbook of the course LC （language and communication） 4001 Reading Skills Development in English for Graduate Studies （2012）, the co-authors carried out a follo...In furtherance of their most recent research on the textbook of the course LC （language and communication） 4001 Reading Skills Development in English for Graduate Studies （2012）, the co-authors carried out a follow-up work on read-aloud approach as some students voiced a sense of dissatisfaction with regard to such means which was primarily used in the LC 4001 class taking place from August 8 to November 27, 2012. In the current study, the data were garnered from 37 students enrolling in LC 4001 from January 8 to May 7, 2013. Based on the questionnaire, the findings revealed that a large number of the English reading learners acknowledged the mounting importance of English as a linguafranca in the region of 84% and 16% at the ＂most＂ and ＂much＂ levels, respectively. Likewise, around 90% of the participants had a positive attitude toward such pedagogical method, while only 10% disliked it. Concerning the academic reading curriculum for higher English reading competence, students＇ different language learning backgrounds and personal excitement caused by reading-aloud activities should be taken on board. Any activity introduced into the classroom should be explicitly stated to the students at the beginning of the course. Using any instructional approach without clear explanations or precautions may seriously upset learners partially or even completely obstruct their effective learning展开更多
The number of scientific investigations on women＇s football specific to the topics of player characteristics and demands of the game has considerably increased in recent years due to the increased popularity of the w...The number of scientific investigations on women＇s football specific to the topics of player characteristics and demands of the game has considerably increased in recent years due to the increased popularity of the women＇s game worldwide, although they are not yet as numerous as in the case of men＇s football. To date, only two scientific publications have attempted to review the main findings of studies published in this area. However, one of them was published about 20 years ago, when women＇s football was still in its infancy and there were only a few studies to report on. The other review was more recent. Nonetheless, its main focus was on the game and training demands of senior elite female players. Thus, information on female footballers of lower competitive levels and younger age groups was not included. Consequently, an updated review is needed in this area. The present article therefore aims to provide an overview of a series of studies that have been published so far on the specific characteristics of female football players and the demands of match-play. Mean values reported in the literature for age （12-27 years）, body height （155-174 cm）, body mass （48-72 kg）, percent body fat （13%-29%）, maximal oxygen uptake （45.1-55.5 mL/kg/min）, Yo-Yo Intermittent Recovery Test Level l （780-1379 m）, maximum heart rate （189-202 bpm）, 30 m sprint times （4.34-4.96 s）, and counter- movement jump or vertical jump （28-50 cm） vary mostly according to the players＇ competitive level and positional role. There are also some special considerations that coaches and other practitioners should he aware of when working with female athletes such as the menstrual cycle, potential pregnancy and lactation, common injury risks （particularly knee and head injuries） and health concerns （e.g., female athlete triad, iron deficiency, and anemia） that may affect players＇ football performance, health or return to play. Reported mean values for total distance covered （4-13 km）, distance covered at high-speed （0.2-1.7 km）, average/peak heart rate （74%-87%/94%-99% HRmax）, average/peak oxygen uptake （52%-77%/96%-98% VO2max）, and blood lactate （2.2-7.3 mmol/L） during women＇s football match-play vary according to the players＇ competitive level and positional role. Methodological differences may account for the discrepancy of the reported values as well. Finally, this review also aims to identify literature gaps that require further scientific research in women＇s football and to derive a few practical recom-mendations. The information presented in this report provides an objective point of reference about player characteristics and game demands at various levels of women＇s football, which can help coaches and sport scientists to design more effective training programs and science-based strategies for the further improvement of players＇ football performance, health, game standards, and positive image of this sport.展开更多
This study aims to investigate teaching programming concepts to K-12 teachers with Scratch. A total of 10 K-12 teachers enrolled in one graduate course participated in this study. They received lectures, took practice...This study aims to investigate teaching programming concepts to K-12 teachers with Scratch. A total of 10 K-12 teachers enrolled in one graduate course participated in this study. They received lectures, took practices and exercises of Scratch programming and were then asked to design and implement their projects before the semester. It was found that teaching programming concepts to K-12 teachers with Scratch is feasible. K-12 teachers with less computer background can learned basic programming concepts and applied them in their project code implementation. Although no significant difference was found between participants＇ pre-test and post-test on programming self-efficacy, positive attitudes toward learning Scratch programming was revealed in the questionnaire survey and results of interviews. This study paves a way for referring to the teaching of programming concepts for K- 12 teachers.展开更多
This action research explores the use of the flipped classroom approach in an English speaking class with 25 students at intermediate level in a vocational college in China's Mainland. It aims at motivating Englis...This action research explores the use of the flipped classroom approach in an English speaking class with 25 students at intermediate level in a vocational college in China's Mainland. It aims at motivating English learners and helping them develop communicative language skills more effectively and efficiently. Both qualitative and quantitative methods are adopted to analyze the data collected through interviews, teaching logs, as well as anonymous questionnaires and a summative assessment. Results show that the flipped classroom approach does stimulate students to invest more time and effort prior to instruction and during class learners do participate in communicative language exercises more enthusiastically. As a result, conceivable progress has been made in learners＇ performance. Possible recommendations of incorporating periodic rotation within the class, adding certain teacher-led instruction, and informal evaluation with group members, are raised at the end of the paper to help further improve the teaching/learning outcome of the flipped classroom approach.展开更多
Translation Quality Assessment （TQA） is a central concern for both academic research and translation practice. Yet consensus on the issue has almost never been reached among theorists and practitioners. In this pape...Translation Quality Assessment （TQA） is a central concern for both academic research and translation practice. Yet consensus on the issue has almost never been reached among theorists and practitioners. In this paper, a detailed comparison between academic and professional assessment has been made mainly in terms of text type, assessment criteria and models. It is believed that a ＂one size fits all＂ model across academy and industry is neither possible nor necessary. However, the gaps in between could be narrowed down by increasing communication and cooperation between theorists and practitioners, who are advised to turn their focus to translator＇s competence and evaluation process.展开更多
As one of the largest global public health problems, cancer greatly endangers human health. Researchers have been committed to discovering anticancer drugs with high efficiency and low toxicity. Shogaol, a kind of ing...As one of the largest global public health problems, cancer greatly endangers human health. Researchers have been committed to discovering anticancer drugs with high efficiency and low toxicity. Shogaol, a kind of ingredient from ginger with high anti-tumor activity, has attracted our attention. This study was an investigation on the composition and structure-activity relationship of different analogues of shogaol, with the purpose to screen for shogaol compounds which had higher anti-tumor activity and could be easily synthesized. We chose zingerone as the starting material to synthesize shogaol through four-step reactions without protective group, as a result, 31 analogues were synthesized for anti-tumor activity detect. The biological test results showed that： the missing of the unsaturated ketone and the phenolic hydroxyl group reduced the anti-tumor activity of shogaol; the site of phenolic hydroxyl had no significant influence on the anti-tumor activity, the indicating that the larger the steric hindrance of substituent, the lower the activity, but the higher the activity of cyclobutyl substituted derivatives.展开更多
Research on Lu Xun is never simply the analysis of an individual writer, but constitutes an understanding of the cultural attributes represented by Lu Xun himself and his writings. Likewise, the evaluation of research...Research on Lu Xun is never simply the analysis of an individual writer, but constitutes an understanding of the cultural attributes represented by Lu Xun himself and his writings. Likewise, the evaluation of research on Lu Xun is never a simple evaluation of academic history, but rather a social evaluation associated with the value orientations of those times. At present, with the return of academic logic and the growing tendency toward private research, a noteworthy divergence of standpoints and evaluations of Lu Xun research has emerged. At the same time, as a prominent discipline that has been over-interpreted, research on Lu Xun is demonstrating a tendency toward redundancy and triviality. Three fundamental paradigms are commonly employed in research on Lu Xun： historical research that attempts to explore historical materials; academic research that focuses on knowledge interpretation and aesthetic evaluation; and contemporary research that pursues the contemporary meaning and values of Lu Xun＇s ideas. Each paradigm offers an insight into and understanding of Lu Xun＇s rich and complex spiritual world; each presents a paradox of one kind or the other; and each performs different value functions.展开更多
Continuum mechanics, just as the name implies, deals with the mechanics problems of all continua, whose physical （or mechanical） properties are assumed to vary continuously in the spaces they occupy. Continuum mecha...Continuum mechanics, just as the name implies, deals with the mechanics problems of all continua, whose physical （or mechanical） properties are assumed to vary continuously in the spaces they occupy. Continuum mechanics may be seen as the symbol of modem mechanics, which differs greatly from current physics, the two often being mixed up by people and even sci- entists. In this short paper, I will first try to give an illustration on the differences between （modem） mechanics and physics, in my personal view, and then focus on some important current research activities in continuum mechanics, attempting to identify its path to the near future. We can see that continuum mechanics, while having a dominating impact on engineering design in the 20th century, also plays a pivotal role in modem science, and is much closer to physics, chemistry, biology, etc. than ever before.展开更多
This paper reviews (CALL 2006) held on June 2-4, 2006 in Beijing, China. It also describes the research and development of CALL in China and reflects on the problems as a result of this symposium.
基金Supported by the National Natural Science Foundation of China(21706282,21276137,61273039,61673236)Science Foundation of China University of Petroleum,Beijing(No.2462017YJRC028)the National High-tech 863 Program of China(2013AA 040702)
文摘Refinery scheduling attracts increasing concerns in both academic and industrial communities in recent years.However, due to the complexity of refinery processes, little has been reported for success use in real world refineries. In academic studies, refinery scheduling is usually treated as an integrated, large-scale optimization problem,though such complex optimization problems are extremely difficult to solve. In this paper, we proposed a way to exploit the prior knowledge existing in refineries, and developed a decision making system to guide the scheduling process. For a real world fuel oil oriented refinery, ten adjusting process scales are predetermined. A C4.5 decision tree works based on the finished oil demand plan to classify the corresponding category(i.e. adjusting scale). Then,a specific sub-scheduling problem with respect to the determined adjusting scale is solved. The proposed strategy is demonstrated with a scheduling case originated from a real world refinery.
文摘In furtherance of their most recent research on the textbook of the course LC （language and communication） 4001 Reading Skills Development in English for Graduate Studies （2012）, the co-authors carried out a follow-up work on read-aloud approach as some students voiced a sense of dissatisfaction with regard to such means which was primarily used in the LC 4001 class taking place from August 8 to November 27, 2012. In the current study, the data were garnered from 37 students enrolling in LC 4001 from January 8 to May 7, 2013. Based on the questionnaire, the findings revealed that a large number of the English reading learners acknowledged the mounting importance of English as a linguafranca in the region of 84% and 16% at the ＂most＂ and ＂much＂ levels, respectively. Likewise, around 90% of the participants had a positive attitude toward such pedagogical method, while only 10% disliked it. Concerning the academic reading curriculum for higher English reading competence, students＇ different language learning backgrounds and personal excitement caused by reading-aloud activities should be taken on board. Any activity introduced into the classroom should be explicitly stated to the students at the beginning of the course. Using any instructional approach without clear explanations or precautions may seriously upset learners partially or even completely obstruct their effective learning
文摘The number of scientific investigations on women＇s football specific to the topics of player characteristics and demands of the game has considerably increased in recent years due to the increased popularity of the women＇s game worldwide, although they are not yet as numerous as in the case of men＇s football. To date, only two scientific publications have attempted to review the main findings of studies published in this area. However, one of them was published about 20 years ago, when women＇s football was still in its infancy and there were only a few studies to report on. The other review was more recent. Nonetheless, its main focus was on the game and training demands of senior elite female players. Thus, information on female footballers of lower competitive levels and younger age groups was not included. Consequently, an updated review is needed in this area. The present article therefore aims to provide an overview of a series of studies that have been published so far on the specific characteristics of female football players and the demands of match-play. Mean values reported in the literature for age （12-27 years）, body height （155-174 cm）, body mass （48-72 kg）, percent body fat （13%-29%）, maximal oxygen uptake （45.1-55.5 mL/kg/min）, Yo-Yo Intermittent Recovery Test Level l （780-1379 m）, maximum heart rate （189-202 bpm）, 30 m sprint times （4.34-4.96 s）, and counter- movement jump or vertical jump （28-50 cm） vary mostly according to the players＇ competitive level and positional role. There are also some special considerations that coaches and other practitioners should he aware of when working with female athletes such as the menstrual cycle, potential pregnancy and lactation, common injury risks （particularly knee and head injuries） and health concerns （e.g., female athlete triad, iron deficiency, and anemia） that may affect players＇ football performance, health or return to play. Reported mean values for total distance covered （4-13 km）, distance covered at high-speed （0.2-1.7 km）, average/peak heart rate （74%-87%/94%-99% HRmax）, average/peak oxygen uptake （52%-77%/96%-98% VO2max）, and blood lactate （2.2-7.3 mmol/L） during women＇s football match-play vary according to the players＇ competitive level and positional role. Methodological differences may account for the discrepancy of the reported values as well. Finally, this review also aims to identify literature gaps that require further scientific research in women＇s football and to derive a few practical recom-mendations. The information presented in this report provides an objective point of reference about player characteristics and game demands at various levels of women＇s football, which can help coaches and sport scientists to design more effective training programs and science-based strategies for the further improvement of players＇ football performance, health, game standards, and positive image of this sport.
文摘This study aims to investigate teaching programming concepts to K-12 teachers with Scratch. A total of 10 K-12 teachers enrolled in one graduate course participated in this study. They received lectures, took practices and exercises of Scratch programming and were then asked to design and implement their projects before the semester. It was found that teaching programming concepts to K-12 teachers with Scratch is feasible. K-12 teachers with less computer background can learned basic programming concepts and applied them in their project code implementation. Although no significant difference was found between participants＇ pre-test and post-test on programming self-efficacy, positive attitudes toward learning Scratch programming was revealed in the questionnaire survey and results of interviews. This study paves a way for referring to the teaching of programming concepts for K- 12 teachers.
文摘This action research explores the use of the flipped classroom approach in an English speaking class with 25 students at intermediate level in a vocational college in China's Mainland. It aims at motivating English learners and helping them develop communicative language skills more effectively and efficiently. Both qualitative and quantitative methods are adopted to analyze the data collected through interviews, teaching logs, as well as anonymous questionnaires and a summative assessment. Results show that the flipped classroom approach does stimulate students to invest more time and effort prior to instruction and during class learners do participate in communicative language exercises more enthusiastically. As a result, conceivable progress has been made in learners＇ performance. Possible recommendations of incorporating periodic rotation within the class, adding certain teacher-led instruction, and informal evaluation with group members, are raised at the end of the paper to help further improve the teaching/learning outcome of the flipped classroom approach.
文摘Translation Quality Assessment （TQA） is a central concern for both academic research and translation practice. Yet consensus on the issue has almost never been reached among theorists and practitioners. In this paper, a detailed comparison between academic and professional assessment has been made mainly in terms of text type, assessment criteria and models. It is believed that a ＂one size fits all＂ model across academy and industry is neither possible nor necessary. However, the gaps in between could be narrowed down by increasing communication and cooperation between theorists and practitioners, who are advised to turn their focus to translator＇s competence and evaluation process.
文摘As one of the largest global public health problems, cancer greatly endangers human health. Researchers have been committed to discovering anticancer drugs with high efficiency and low toxicity. Shogaol, a kind of ingredient from ginger with high anti-tumor activity, has attracted our attention. This study was an investigation on the composition and structure-activity relationship of different analogues of shogaol, with the purpose to screen for shogaol compounds which had higher anti-tumor activity and could be easily synthesized. We chose zingerone as the starting material to synthesize shogaol through four-step reactions without protective group, as a result, 31 analogues were synthesized for anti-tumor activity detect. The biological test results showed that： the missing of the unsaturated ketone and the phenolic hydroxyl group reduced the anti-tumor activity of shogaol; the site of phenolic hydroxyl had no significant influence on the anti-tumor activity, the indicating that the larger the steric hindrance of substituent, the lower the activity, but the higher the activity of cyclobutyl substituted derivatives.
文摘Research on Lu Xun is never simply the analysis of an individual writer, but constitutes an understanding of the cultural attributes represented by Lu Xun himself and his writings. Likewise, the evaluation of research on Lu Xun is never a simple evaluation of academic history, but rather a social evaluation associated with the value orientations of those times. At present, with the return of academic logic and the growing tendency toward private research, a noteworthy divergence of standpoints and evaluations of Lu Xun research has emerged. At the same time, as a prominent discipline that has been over-interpreted, research on Lu Xun is demonstrating a tendency toward redundancy and triviality. Three fundamental paradigms are commonly employed in research on Lu Xun： historical research that attempts to explore historical materials; academic research that focuses on knowledge interpretation and aesthetic evaluation; and contemporary research that pursues the contemporary meaning and values of Lu Xun＇s ideas. Each paradigm offers an insight into and understanding of Lu Xun＇s rich and complex spiritual world; each presents a paradox of one kind or the other; and each performs different value functions.
基金Project supported by the National Natural Science of Foundation of China(Nos.11321202 and 11272281)
文摘Continuum mechanics, just as the name implies, deals with the mechanics problems of all continua, whose physical （or mechanical） properties are assumed to vary continuously in the spaces they occupy. Continuum mechanics may be seen as the symbol of modem mechanics, which differs greatly from current physics, the two often being mixed up by people and even sci- entists. In this short paper, I will first try to give an illustration on the differences between （modem） mechanics and physics, in my personal view, and then focus on some important current research activities in continuum mechanics, attempting to identify its path to the near future. We can see that continuum mechanics, while having a dominating impact on engineering design in the 20th century, also plays a pivotal role in modem science, and is much closer to physics, chemistry, biology, etc. than ever before.
文摘This paper reviews (CALL 2006) held on June 2-4, 2006 in Beijing, China. It also describes the research and development of CALL in China and reflects on the problems as a result of this symposium.
