The study of paper damage under bombardments of protons and X--rays is reported. An on--demand beam pulsing system is useful for the PIXE analysis of delicate objectS. IXX (or PIXE--induced XRF) is more suitable than ...The study of paper damage under bombardments of protons and X--rays is reported. An on--demand beam pulsing system is useful for the PIXE analysis of delicate objectS. IXX (or PIXE--induced XRF) is more suitable than PIXE in terms of damage to the sample. Some new PIXE and IXX applications of archaeological paper--like samples in recent years are given.展开更多
Using the simulation test facility designed on the basis of similitude principle, the authors of the paper carry out a series of simulation tests and study the influence of effective factors on the stress in the freez...Using the simulation test facility designed on the basis of similitude principle, the authors of the paper carry out a series of simulation tests and study the influence of effective factors on the stress in the freezing pipes during hoth periods of active freezing and excavating-lining. They obtain preliminarily the regularity of stress variation and discuss the causes of freezing pipe fracture.展开更多
文摘The study of paper damage under bombardments of protons and X--rays is reported. An on--demand beam pulsing system is useful for the PIXE analysis of delicate objectS. IXX (or PIXE--induced XRF) is more suitable than PIXE in terms of damage to the sample. Some new PIXE and IXX applications of archaeological paper--like samples in recent years are given.
文摘Using the simulation test facility designed on the basis of similitude principle, the authors of the paper carry out a series of simulation tests and study the influence of effective factors on the stress in the freezing pipes during hoth periods of active freezing and excavating-lining. They obtain preliminarily the regularity of stress variation and discuss the causes of freezing pipe fracture.
