Mine dust is one of the main hazards in underground longwall mines worldwide.In order to solve the mine dust problem,a significant number of studies have been carried out regarding longwall mine dust control,both in C...Mine dust is one of the main hazards in underground longwall mines worldwide.In order to solve the mine dust problem,a significant number of studies have been carried out regarding longwall mine dust control,both in China and Australia.This paper presents a comparative study of dust control practices in Chinese and Australian longwall mines,with particular references to statutory limits,dust monitoring methods and dust management practices,followed by a brief discussion on the research status of longwall mine dust control in both countries.The study shows that water infusion,face ventilation controls,water sprays,and deep and wet cutting in longwall shearer operations are commonly practiced in almost all underground longwall mines and that both Chinese and Australian longwall mine dust control practices have their own advantages and disadvantages.It is concluded that there is a need for further development and innovative design of more effective dust mitigation products or systems despite the development of various dust control technologies.Based on the examinations and discussions,the authors have made some recommendations for further research and development in dust control in longwall mines.It is hoped that this comparative study will provide beneficial guidance for scholars and engineers who are engaging in longwall mine dust control research and practice.展开更多
The world’s 500 largest companies generated US$31.2trillion in revenues in 2014,up 0.49 percent year-on-year,while their profits declined 14.76 percent year-on-year to US$1.67 trillion A total of 106 Chinese companie...The world’s 500 largest companies generated US$31.2trillion in revenues in 2014,up 0.49 percent year-on-year,while their profits declined 14.76 percent year-on-year to US$1.67 trillion A total of 106 Chinese companies made it into this year’s Fortune Global 500 list,up from 100 in 2014, according to the annual ranking released in late July 2015.展开更多
The burgeoning geriatric population worldwide has resulted in an unprecedented challenge to the cardiology community. Cardiovascular disease is the major cause of morbidity and mortality in the elderly population, but...The burgeoning geriatric population worldwide has resulted in an unprecedented challenge to the cardiology community. Cardiovascular disease is the major cause of morbidity and mortality in the elderly population, but its recognition and management are characteristically confounded by substantial comorbidities, polypharmacy, and other complexities of care, not encountered in younger cardiac patients.展开更多
At the World Economic Forum＇s threeday meeting in Dalian,Liaoning Province,China＇s economic growth is once again in the spotlight.More than 1,700 participants from 90 countries are attending＂Summer Davos＂,opening ...At the World Economic Forum＇s threeday meeting in Dalian,Liaoning Province,China＇s economic growth is once again in the spotlight.More than 1,700 participants from 90 countries are attending＂Summer Davos＂,opening in early September,to chart a new course for growth as global recovery sinks into uncertainty.Before the conference began,business leaders from international companies shared their opinions with China＇s news media about China＇s economic prospects and what strategies they may take to readjust to the nation＇s new normal of growth.Here are the excerpts from the interview with Ahmad Khowaiter, Chief Technology Officer of Saudi Aramco：展开更多
基金supported by the Program for New Century Excellent Talents in University of China(No.NCET-10-0770)the financial support provided by the China Scholarship Council(Nos.201306425002&201406425048)the University of Wollongong to pursue study at the University of Wollongong as undergraduate visiting students
文摘Mine dust is one of the main hazards in underground longwall mines worldwide.In order to solve the mine dust problem,a significant number of studies have been carried out regarding longwall mine dust control,both in China and Australia.This paper presents a comparative study of dust control practices in Chinese and Australian longwall mines,with particular references to statutory limits,dust monitoring methods and dust management practices,followed by a brief discussion on the research status of longwall mine dust control in both countries.The study shows that water infusion,face ventilation controls,water sprays,and deep and wet cutting in longwall shearer operations are commonly practiced in almost all underground longwall mines and that both Chinese and Australian longwall mine dust control practices have their own advantages and disadvantages.It is concluded that there is a need for further development and innovative design of more effective dust mitigation products or systems despite the development of various dust control technologies.Based on the examinations and discussions,the authors have made some recommendations for further research and development in dust control in longwall mines.It is hoped that this comparative study will provide beneficial guidance for scholars and engineers who are engaging in longwall mine dust control research and practice.
文摘The world’s 500 largest companies generated US$31.2trillion in revenues in 2014,up 0.49 percent year-on-year,while their profits declined 14.76 percent year-on-year to US$1.67 trillion A total of 106 Chinese companies made it into this year’s Fortune Global 500 list,up from 100 in 2014, according to the annual ranking released in late July 2015.
文摘The burgeoning geriatric population worldwide has resulted in an unprecedented challenge to the cardiology community. Cardiovascular disease is the major cause of morbidity and mortality in the elderly population, but its recognition and management are characteristically confounded by substantial comorbidities, polypharmacy, and other complexities of care, not encountered in younger cardiac patients.
文摘At the World Economic Forum＇s threeday meeting in Dalian,Liaoning Province,China＇s economic growth is once again in the spotlight.More than 1,700 participants from 90 countries are attending＂Summer Davos＂,opening in early September,to chart a new course for growth as global recovery sinks into uncertainty.Before the conference began,business leaders from international companies shared their opinions with China＇s news media about China＇s economic prospects and what strategies they may take to readjust to the nation＇s new normal of growth.Here are the excerpts from the interview with Ahmad Khowaiter, Chief Technology Officer of Saudi Aramco：
