TN941.1 95010544提高彩电图像分辨率的研讨=Development onincreasing resolution factor of color television[刊,中]/张秀屏,刘锡国,丛玉良(吉林工业大学电子系.吉林,长春(130022))//光学精密工程.—1994,2(2).—89—93介绍利用计算...TN941.1 95010544提高彩电图像分辨率的研讨=Development onincreasing resolution factor of color television[刊,中]/张秀屏,刘锡国,丛玉良(吉林工业大学电子系.吉林,长春(130022))//光学精密工程.—1994,2(2).—89—93介绍利用计算机辅助分析程序作工具,研究与分析亮度通道电路,从而提高彩电图像的分辨率。图7表1参2(任延同)展开更多
An improvement for application of Dancoff factor is developed. It combines Stamm'ler's two-term method for resonance integral calculation with neutron current method for Dancoff factor calculation. Stamm'l...An improvement for application of Dancoff factor is developed. It combines Stamm'ler's two-term method for resonance integral calculation with neutron current method for Dancoff factor calculation. Stamm'ler's formulation, which is originally derived for the infinite lattice geometry, can be easily revised to contain the Dancoff factor explicitly, while the neutron current method can easily calculate the Dancoff factor for general irregular assembly geometry. For the resonance interference effects the resonance interference factor table is built in pairs of nuclides, only for the interference between 238 U and other resonance nuclides, spanning over a range of background cross-section and number density ratio of the pairing nuclides. A series of verification calculations have been carried out for problems of infinite lattice and single assembly geometry, with two or multiple resonance absorbers. For these verification calculations, our improvement on Dancoff factor application and resonance interference give good results.展开更多
Applying the extreme low-level γ-ray spectroscopic analysis the environmental neutron flux is measured using different moderator construction and environment through the reaction 197Au (n, γ) 198Au. The contribution...Applying the extreme low-level γ-ray spectroscopic analysis the environmental neutron flux is measured using different moderator construction and environment through the reaction 197Au (n, γ) 198Au. The contribution of thermal and resonance neutrons is separated using the cadmium difference technique, while fast neutrons are measured by the paraffin moderator. The results of altitude dependence of the neutron flux are discussed. The thermal neutron flux near the surface of sea water is less than its value at 100 cm over ground near sea water, while the value over the surfaces of fresh water is higher than that near the surface of sea water. Also the thermal neutron flux at 5 cm soil depth increases, then decreases to its original value at 10 cm depth and still constant until 25 cm, then decreases rapidly to reach 27% of its original value at 60 cm depth. The soil compositions, corresponding neutron temperatures and effective absorption cross sections of earth are the most effective factors on the equilibrium region of thermal neutrons in the ground.展开更多
It is necessary to develop a series of fission chamber in different sensitivities from high to very low sensitivity for covering the yield range of fusion neutron 10^13～10^21n·s-1 produced by ITER. The high sens...It is necessary to develop a series of fission chamber in different sensitivities from high to very low sensitivity for covering the yield range of fusion neutron 10^13～10^21n·s-1 produced by ITER. The high sensitivity fission chamber employs high purity 235U as fissile material, 1 ～ 1.5 g 235U is coated on the multi-electrodes, its structure is shown in Fig. 1 （a）.展开更多
文摘TN941.1 95010544提高彩电图像分辨率的研讨=Development onincreasing resolution factor of color television[刊,中]/张秀屏,刘锡国,丛玉良(吉林工业大学电子系.吉林,长春(130022))//光学精密工程.—1994,2(2).—89—93介绍利用计算机辅助分析程序作工具,研究与分析亮度通道电路,从而提高彩电图像的分辨率。图7表1参2(任延同)
文摘An improvement for application of Dancoff factor is developed. It combines Stamm'ler's two-term method for resonance integral calculation with neutron current method for Dancoff factor calculation. Stamm'ler's formulation, which is originally derived for the infinite lattice geometry, can be easily revised to contain the Dancoff factor explicitly, while the neutron current method can easily calculate the Dancoff factor for general irregular assembly geometry. For the resonance interference effects the resonance interference factor table is built in pairs of nuclides, only for the interference between 238 U and other resonance nuclides, spanning over a range of background cross-section and number density ratio of the pairing nuclides. A series of verification calculations have been carried out for problems of infinite lattice and single assembly geometry, with two or multiple resonance absorbers. For these verification calculations, our improvement on Dancoff factor application and resonance interference give good results.
文摘Applying the extreme low-level γ-ray spectroscopic analysis the environmental neutron flux is measured using different moderator construction and environment through the reaction 197Au (n, γ) 198Au. The contribution of thermal and resonance neutrons is separated using the cadmium difference technique, while fast neutrons are measured by the paraffin moderator. The results of altitude dependence of the neutron flux are discussed. The thermal neutron flux near the surface of sea water is less than its value at 100 cm over ground near sea water, while the value over the surfaces of fresh water is higher than that near the surface of sea water. Also the thermal neutron flux at 5 cm soil depth increases, then decreases to its original value at 10 cm depth and still constant until 25 cm, then decreases rapidly to reach 27% of its original value at 60 cm depth. The soil compositions, corresponding neutron temperatures and effective absorption cross sections of earth are the most effective factors on the equilibrium region of thermal neutrons in the ground.
文摘It is necessary to develop a series of fission chamber in different sensitivities from high to very low sensitivity for covering the yield range of fusion neutron 10^13～10^21n·s-1 produced by ITER. The high sensitivity fission chamber employs high purity 235U as fissile material, 1 ～ 1.5 g 235U is coated on the multi-electrodes, its structure is shown in Fig. 1 （a）.
