In the sixties, a kind of channel electron multipliers (CEM) with continuous dynode, high gain, low noise, and insensitive to atmosphere has been vigorously developed. Such compact and light devices can be used for th...In the sixties, a kind of channel electron multipliers (CEM) with continuous dynode, high gain, low noise, and insensitive to atmosphere has been vigorously developed. Such compact and light devices can be used for the detection of energetic particles in space researches and laboratories. Because of their windowless construction, they are especially suitable for the detection of low energy electrons. Accordingly, at present they have been widely used in various electron spectrometers. The high resolution is one of the features of the CEM in comparison with the discontinuous electron multipliers. A resolution of about 50％ for the tubular CEM (1, 2) and about 15％ for the parallel plate CEM (PPEM) (3—5) has been reported.展开更多
In the last ten years, a series of new organosilicon compounds known as 'silatranes' with highly specific biological actvity have received much attention from scientists. In 1966, Voronkov announced that these...In the last ten years, a series of new organosilicon compounds known as 'silatranes' with highly specific biological actvity have received much attention from scientists. In 1966, Voronkov announced that these compounds possess transannular structure between penta-coordinated silicon and tetracoordinated nitrogen, such展开更多
The study on the radiation damage of organism is one of important subjects in btoscience. To erplain the complex damage mechanism on a molecular level, it is reasonable approach to investigate first the simple molecul...The study on the radiation damage of organism is one of important subjects in btoscience. To erplain the complex damage mechanism on a molecular level, it is reasonable approach to investigate first the simple molecule, e.g. amino acids. The damage of amino acids by high energy radia-展开更多
文摘In the sixties, a kind of channel electron multipliers (CEM) with continuous dynode, high gain, low noise, and insensitive to atmosphere has been vigorously developed. Such compact and light devices can be used for the detection of energetic particles in space researches and laboratories. Because of their windowless construction, they are especially suitable for the detection of low energy electrons. Accordingly, at present they have been widely used in various electron spectrometers. The high resolution is one of the features of the CEM in comparison with the discontinuous electron multipliers. A resolution of about 50％ for the tubular CEM (1, 2) and about 15％ for the parallel plate CEM (PPEM) (3—5) has been reported.
文摘In the last ten years, a series of new organosilicon compounds known as 'silatranes' with highly specific biological actvity have received much attention from scientists. In 1966, Voronkov announced that these compounds possess transannular structure between penta-coordinated silicon and tetracoordinated nitrogen, such
文摘The study on the radiation damage of organism is one of important subjects in btoscience. To erplain the complex damage mechanism on a molecular level, it is reasonable approach to investigate first the simple molecule, e.g. amino acids. The damage of amino acids by high energy radia-
