The concentrations of 30 elements in aerosol particles collected in western Pacific ocean have been determined by INAA. The crustal element concentrations decrease with increasing distance from land over the remote ar...The concentrations of 30 elements in aerosol particles collected in western Pacific ocean have been determined by INAA. The crustal element concentrations decrease with increasing distance from land over the remote area close to Asia land and fluctuate around its average value over the remote ocean area. The volatile elements exhibite average atmospheric concentrations that are higher than those expected from the flux of seasalt or the continental dust. In order to identify marine aerosol component originating from the continent or ocean, the aerosol particles are examined by scanning electron microscopy combined with energy dispersive X-ray spectroscopy. Particle phase structure shows that the crustal aerosol particles are not present internal mixtures with seasalt aerosol, and it also proves the long-range transport of crustal elements from continent to ocean.展开更多
In order to obtain uniform exposure in variably shaped electron beam lithography,the beam current density and edge resolution on the target must not change for different spotshapes and sizes.The key to the goal is the...In order to obtain uniform exposure in variably shaped electron beam lithography,the beam current density and edge resolution on the target must not change for different spotshapes and sizes.The key to the goal is the appropriate design of shaping deflectors.A linearand rotation compensation approach is presented.Values of linear and rotation compensationfactors versus the distances between electron source image and centers of deflectors are measuredon an experimental electron beam column with variable spot shaping.The experimental resultsare in good agreement with the calculated ones.展开更多
The way to find the eigenfield of a negative unstable cavity filled with a radial variable and self-adjustable gain medium is suggested.The calculated results based on this method fit the experimental data of the Ne 6...The way to find the eigenfield of a negative unstable cavity filled with a radial variable and self-adjustable gain medium is suggested.The calculated results based on this method fit the experimental data of the Ne 633nm laser satisfactorily.展开更多
Ⅰ. INTRODUCTION In recent years, ion microprobe secondary ion mass spectrometry has found a wide application in micro-analyses.However, isotopic and molecular ion mass interferences have posed a problem in qualitativ...Ⅰ. INTRODUCTION In recent years, ion microprobe secondary ion mass spectrometry has found a wide application in micro-analyses.However, isotopic and molecular ion mass interferences have posed a problem in qualitative or quantitative interpretation of展开更多
Ⅰ. INTRODUCTION In the application of ion microprobe mass analysis to various scientific fields such as material science, geology chemical engineering, biology and medicine, involving nonconductors, the analysis of n...Ⅰ. INTRODUCTION In the application of ion microprobe mass analysis to various scientific fields such as material science, geology chemical engineering, biology and medicine, involving nonconductors, the analysis of nonconductor is one of the most important problems.展开更多
文摘The concentrations of 30 elements in aerosol particles collected in western Pacific ocean have been determined by INAA. The crustal element concentrations decrease with increasing distance from land over the remote area close to Asia land and fluctuate around its average value over the remote ocean area. The volatile elements exhibite average atmospheric concentrations that are higher than those expected from the flux of seasalt or the continental dust. In order to identify marine aerosol component originating from the continent or ocean, the aerosol particles are examined by scanning electron microscopy combined with energy dispersive X-ray spectroscopy. Particle phase structure shows that the crustal aerosol particles are not present internal mixtures with seasalt aerosol, and it also proves the long-range transport of crustal elements from continent to ocean.
文摘In order to obtain uniform exposure in variably shaped electron beam lithography,the beam current density and edge resolution on the target must not change for different spotshapes and sizes.The key to the goal is the appropriate design of shaping deflectors.A linearand rotation compensation approach is presented.Values of linear and rotation compensationfactors versus the distances between electron source image and centers of deflectors are measuredon an experimental electron beam column with variable spot shaping.The experimental resultsare in good agreement with the calculated ones.
文摘The way to find the eigenfield of a negative unstable cavity filled with a radial variable and self-adjustable gain medium is suggested.The calculated results based on this method fit the experimental data of the Ne 633nm laser satisfactorily.
文摘Ⅰ. INTRODUCTION In recent years, ion microprobe secondary ion mass spectrometry has found a wide application in micro-analyses.However, isotopic and molecular ion mass interferences have posed a problem in qualitative or quantitative interpretation of
文摘Ⅰ. INTRODUCTION In the application of ion microprobe mass analysis to various scientific fields such as material science, geology chemical engineering, biology and medicine, involving nonconductors, the analysis of nonconductor is one of the most important problems.
