We have designed,assembled,and tested a 4-MA,60-ns fast linear transformer driver(LTD),which is the first operating generator featuring multiple LTD modules connected in parallel.The LTD-based accelerator comprises si...We have designed,assembled,and tested a 4-MA,60-ns fast linear transformer driver(LTD),which is the first operating generator featuring multiple LTD modules connected in parallel.The LTD-based accelerator comprises six modules in parallel,each of which has ten-stage cavities stacked in series.The six LTD modules are connected to a water tank of diameter 6 m via a 3-m-long impedance-matched deionized waterinsulated coaxial transmission line.In the water tank,the electrical pulses are transmitted down by six horizontal tri-plate transmission lines.A 2.1-m-diameter two-level vacuum insulator stack is utilized to separate the deionized water region from the vacuum region.In the vacuum,the currents are further transported downstream by a two-level magnetically insulated transmission-line and then converged through four post-hole convolutes.Plasma radiation loads or bremsstrahlung electron beam diodes serve as loads that are expected to generate intense soft X rays or warm X rays.The machine is 3.2 m in height and 22 m in outer diameter,including support systems such as a high-voltage charge supply,magnetic core reset system,trigger system,and support platform for inner stalk installation and maintenance.A total of 1440 individual±100-kV multi-gap spark switches and 2880 individual 100-kV capacitors are employed in the accelerator.A total of 12 fiberoptic laser-controlled trigger generators combining photoconductive and traditional gas spark switch technologies are used to realize the synchronous discharge of the more than 1000 gas switches.At an LTD charge voltage of±85 kV,the accelerator stores an initial energy of about 300 kJ and is expected to deliver a current of 3–5 MA into various loads.To date,the LTD facility has shot into a thick-walled aluminum liner load and a reflex triode load.With a thick-walled aluminum liner of inductance 1.81 nH,a current with peak up to 4.1 MA and rise time(10%–90%)of about 60 ns has been achieved.The current transport efficiency from the insulator stack to the liner load approaches 100%during peak times.The LTD accelerator has been used to drive reflex triode loads generating warm X rays with high energy fluence and large radiation area.It has been demonstrated that this LTD is a promising and high-efficiency prime pulsed power source suitable for use in constructing the next generation of large-scale accelerators with currents of tens of megaamperes.展开更多
There are many differences and challenges that employers face while managing employees in the current work force. Our present day workforce is made up of a diverse group of people： Matures, also known as Veterans （a...There are many differences and challenges that employers face while managing employees in the current work force. Our present day workforce is made up of a diverse group of people： Matures, also known as Veterans （age 55＋）, Baby Boomers （age 45-54）, Generation X （age 35-44） and Generation Y also known as Millennial （age 18-34）. The differences and challenges among these groups will be evident when reviewing recognition and praise, managerial styles, subordinate responses to generational leadership. Companies are stepping back and looking more holistically at how to develop programs and deploy technology that will speak to four distinct generations in the workforce （Sprague, 2008）. Each generation has their own definition of work ethic, responsibility, and performance. The best way to deal with the multi-generations is coming up with ways that make everybody feel like they are members of a team, thus helping them to learn how to develop a better way of communication than what exists between them now. If everybody is a part of a team, then they are all sharing the benefits that the other generations can bring to the table, making them a strong entity. Matures and boomers can become mentors to the X and Y＇s, and the X and Y＇s can then share and impart their knowledge of technology to the Matures and boomers. Companies in today＇s workplace must learn a better way to understand the values of the four generations, for it is very important in understanding and guiding these people in the workplace. Without this proper understanding, the guidance and alliance that managers are hoping to achieve will be even longer in the making and then one, possibly two, whole generations will be gone from the workforce and their knowledge and skill gone as well.展开更多
This study sets out to examine:In a traditional value context,which variables are related to the attitude of depreciation of Millennials by GX in an organizational setting?Through a Factorial Correspondence Analysis,i...This study sets out to examine:In a traditional value context,which variables are related to the attitude of depreciation of Millennials by GX in an organizational setting?Through a Factorial Correspondence Analysis,it is postulated that three factors would be at the origin of the depreciation of Millennials in an organizational environment.The analysis shows a correlation between the 10 variables analyzed,but two factors emerge:the GY’s ability to invest or build and the GY’s commitment to starting a household.The hypothesis that there are three latent factors underlying the data analyzed is therefore rejected.展开更多
Recent advances in selected areas of laser science are briefly reviewed. They include laser technology, coherent control of quantum systems by lasers, X ray generation by ultrashort high intensity laser pulses, and ...Recent advances in selected areas of laser science are briefly reviewed. They include laser technology, coherent control of quantum systems by lasers, X ray generation by ultrashort high intensity laser pulses, and laser spectroscopic studies of surface catalysis in real environment.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12027811 and 51790524).
文摘We have designed,assembled,and tested a 4-MA,60-ns fast linear transformer driver(LTD),which is the first operating generator featuring multiple LTD modules connected in parallel.The LTD-based accelerator comprises six modules in parallel,each of which has ten-stage cavities stacked in series.The six LTD modules are connected to a water tank of diameter 6 m via a 3-m-long impedance-matched deionized waterinsulated coaxial transmission line.In the water tank,the electrical pulses are transmitted down by six horizontal tri-plate transmission lines.A 2.1-m-diameter two-level vacuum insulator stack is utilized to separate the deionized water region from the vacuum region.In the vacuum,the currents are further transported downstream by a two-level magnetically insulated transmission-line and then converged through four post-hole convolutes.Plasma radiation loads or bremsstrahlung electron beam diodes serve as loads that are expected to generate intense soft X rays or warm X rays.The machine is 3.2 m in height and 22 m in outer diameter,including support systems such as a high-voltage charge supply,magnetic core reset system,trigger system,and support platform for inner stalk installation and maintenance.A total of 1440 individual±100-kV multi-gap spark switches and 2880 individual 100-kV capacitors are employed in the accelerator.A total of 12 fiberoptic laser-controlled trigger generators combining photoconductive and traditional gas spark switch technologies are used to realize the synchronous discharge of the more than 1000 gas switches.At an LTD charge voltage of±85 kV,the accelerator stores an initial energy of about 300 kJ and is expected to deliver a current of 3–5 MA into various loads.To date,the LTD facility has shot into a thick-walled aluminum liner load and a reflex triode load.With a thick-walled aluminum liner of inductance 1.81 nH,a current with peak up to 4.1 MA and rise time(10%–90%)of about 60 ns has been achieved.The current transport efficiency from the insulator stack to the liner load approaches 100%during peak times.The LTD accelerator has been used to drive reflex triode loads generating warm X rays with high energy fluence and large radiation area.It has been demonstrated that this LTD is a promising and high-efficiency prime pulsed power source suitable for use in constructing the next generation of large-scale accelerators with currents of tens of megaamperes.
文摘There are many differences and challenges that employers face while managing employees in the current work force. Our present day workforce is made up of a diverse group of people： Matures, also known as Veterans （age 55＋）, Baby Boomers （age 45-54）, Generation X （age 35-44） and Generation Y also known as Millennial （age 18-34）. The differences and challenges among these groups will be evident when reviewing recognition and praise, managerial styles, subordinate responses to generational leadership. Companies are stepping back and looking more holistically at how to develop programs and deploy technology that will speak to four distinct generations in the workforce （Sprague, 2008）. Each generation has their own definition of work ethic, responsibility, and performance. The best way to deal with the multi-generations is coming up with ways that make everybody feel like they are members of a team, thus helping them to learn how to develop a better way of communication than what exists between them now. If everybody is a part of a team, then they are all sharing the benefits that the other generations can bring to the table, making them a strong entity. Matures and boomers can become mentors to the X and Y＇s, and the X and Y＇s can then share and impart their knowledge of technology to the Matures and boomers. Companies in today＇s workplace must learn a better way to understand the values of the four generations, for it is very important in understanding and guiding these people in the workplace. Without this proper understanding, the guidance and alliance that managers are hoping to achieve will be even longer in the making and then one, possibly two, whole generations will be gone from the workforce and their knowledge and skill gone as well.
文摘This study sets out to examine:In a traditional value context,which variables are related to the attitude of depreciation of Millennials by GX in an organizational setting?Through a Factorial Correspondence Analysis,it is postulated that three factors would be at the origin of the depreciation of Millennials in an organizational environment.The analysis shows a correlation between the 10 variables analyzed,but two factors emerge:the GY’s ability to invest or build and the GY’s commitment to starting a household.The hypothesis that there are three latent factors underlying the data analyzed is therefore rejected.
文摘Recent advances in selected areas of laser science are briefly reviewed. They include laser technology, coherent control of quantum systems by lasers, X ray generation by ultrashort high intensity laser pulses, and laser spectroscopic studies of surface catalysis in real environment.
