Irregular economy develops very rapidly in world economy these years and it is also one of the most difficult problems in economy to research and estimate.There are several methods to estimate the scale of irregular e...Irregular economy develops very rapidly in world economy these years and it is also one of the most difficult problems in economy to research and estimate.There are several methods to estimate the scale of irregular economy.The author defines the range of irregular economy and interprets the characteristics of irregular economy and tells us the connection with the National Accounting System.Secondly,according to the characteristics of Chinese currency flow,the author revises the method of currency ratio and makes empirical analysis and receives a good result.展开更多
Large-scale carbon films were prepared using a simple pyrolysis method, on which nanostructured loose pores can be found by SEM observation. The as-prepared carbon films are superhydrophobic after the modification of ...Large-scale carbon films were prepared using a simple pyrolysis method, on which nanostructured loose pores can be found by SEM observation. The as-prepared carbon films are superhydrophobic after the modification of low-surface-energy material fluoroalkylsilane, with the water contact angle of 162.3°±2.1°. XPS measurement indicates that the films were hydrophobilized. It′s considered that nanostructures are important to the superhydrophobicity since air exist beneath water and the contact area between water and carbon film decrease. Such superhysrophobic carbon films can be widely applied in many fields.展开更多
文摘Irregular economy develops very rapidly in world economy these years and it is also one of the most difficult problems in economy to research and estimate.There are several methods to estimate the scale of irregular economy.The author defines the range of irregular economy and interprets the characteristics of irregular economy and tells us the connection with the National Accounting System.Secondly,according to the characteristics of Chinese currency flow,the author revises the method of currency ratio and makes empirical analysis and receives a good result.
文摘Large-scale carbon films were prepared using a simple pyrolysis method, on which nanostructured loose pores can be found by SEM observation. The as-prepared carbon films are superhydrophobic after the modification of low-surface-energy material fluoroalkylsilane, with the water contact angle of 162.3°±2.1°. XPS measurement indicates that the films were hydrophobilized. It′s considered that nanostructures are important to the superhydrophobicity since air exist beneath water and the contact area between water and carbon film decrease. Such superhysrophobic carbon films can be widely applied in many fields.
