The energy loss and stopping power of ^(4)He ions in mylar foils were determined in a transmission geometry.The experimental stopping power data were compared to the previous measurements at higher energies.At lower e...The energy loss and stopping power of ^(4)He ions in mylar foils were determined in a transmission geometry.The experimental stopping power data were compared to the previous measurements at higher energies.At lower energies,no previous measurements exist.The present results were also compared to the commonly used semiempirically theoretical predictions by Ziegler and Manoyan,and significant deviations were observed.展开更多
Energy loss of 0.45-5.0 MeV 4He ions in Au and Ag films were measured with the Rutherford backscattering method,and the stopping powers at lower energy range were extracted by comparing with that determined by Anderso...Energy loss of 0.45-5.0 MeV 4He ions in Au and Ag films were measured with the Rutherford backscattering method,and the stopping powers at lower energy range were extracted by comparing with that determined by Anderson et al.at higher energy range.Significant deviation between the experimental data and the semiempirical calculations by TRIM-90 appears around the stopping maximum.The accuracy of our results was expected to be±l%.展开更多
The stopping powers of Br and C in Ag Elm have been measured with the method of elastic recoil detection in energy range 0.28-0.42MeV/amu.The results have been compared with the theoretical calculations of TRIM-90.
The stopping powers of CaF_(2) and MoO_(3) for ^(16)O and ^(19)F were measured with heavy-substrate Rutherford backscattering technique.The present results are compared with the prediction of Bragg's rule,and stro...The stopping powers of CaF_(2) and MoO_(3) for ^(16)O and ^(19)F were measured with heavy-substrate Rutherford backscattering technique.The present results are compared with the prediction of Bragg's rule,and strong deviation was observed.The experimental error is 5%or so.展开更多
The carbon-ion radioactivity of ^(223)Ra has been measured with solid state track detectors.A branching ratio of the emission of ^(14)c nuclei to that of alpha-particles of(8.7±1.7)×10^(-10) is obtained.The ...The carbon-ion radioactivity of ^(223)Ra has been measured with solid state track detectors.A branching ratio of the emission of ^(14)c nuclei to that of alpha-particles of(8.7±1.7)×10^(-10) is obtained.The preformation probability of ^(14)c in ^(223)Ra and the odd-even effect are discussed.展开更多
After financial technology(fintech),supervisory tech-nology(SupTech)has become the new hot topic in the financial sector.As the financial system reform in China continues to deepen,the Chinese financial market is tran...After financial technology(fintech),supervisory tech-nology(SupTech)has become the new hot topic in the financial sector.As the financial system reform in China continues to deepen,the Chinese financial market is trans-forming at an increasingly rapid pace.At the same time,a new round of technological and industrial revolution is booming.Exemplified by Big Data,cloud computing,and artificial intelligence(AI),modern information technology has become deeply integrated with economic society.New technologies not only drive progress in industry and the market,but also take root in the regulatory space.As well as issuing new standards and regulations,regulators must also deal with new risks and challenges in completely novel ways.This requires regulators to stay at the forefront of developments.展开更多
基金the National Natural Science Foundation of Chinathe Doctoral Program Foundation of Institute of Higher Education and the Postdoctoral Research Foundation.
文摘The energy loss and stopping power of ^(4)He ions in mylar foils were determined in a transmission geometry.The experimental stopping power data were compared to the previous measurements at higher energies.At lower energies,no previous measurements exist.The present results were also compared to the commonly used semiempirically theoretical predictions by Ziegler and Manoyan,and significant deviations were observed.
基金Supported by Doctoral Program Foundation of Institute of Higher Education,and Supported in part by the Zhongguancun Analytic and Measuring Center.
文摘Energy loss of 0.45-5.0 MeV 4He ions in Au and Ag films were measured with the Rutherford backscattering method,and the stopping powers at lower energy range were extracted by comparing with that determined by Anderson et al.at higher energy range.Significant deviation between the experimental data and the semiempirical calculations by TRIM-90 appears around the stopping maximum.The accuracy of our results was expected to be±l%.
基金Supported by Doctoral Programme Foundation of Institution of Higher Education。
文摘The stopping powers of Br and C in Ag Elm have been measured with the method of elastic recoil detection in energy range 0.28-0.42MeV/amu.The results have been compared with the theoretical calculations of TRIM-90.
基金Supported by the National Natural Science Foundation of Chinathe Doctoral Program Foundation of Institute of Higher Education.
文摘The stopping powers of CaF_(2) and MoO_(3) for ^(16)O and ^(19)F were measured with heavy-substrate Rutherford backscattering technique.The present results are compared with the prediction of Bragg's rule,and strong deviation was observed.The experimental error is 5%or so.
文摘The carbon-ion radioactivity of ^(223)Ra has been measured with solid state track detectors.A branching ratio of the emission of ^(14)c nuclei to that of alpha-particles of(8.7±1.7)×10^(-10) is obtained.The preformation probability of ^(14)c in ^(223)Ra and the odd-even effect are discussed.
文摘After financial technology(fintech),supervisory tech-nology(SupTech)has become the new hot topic in the financial sector.As the financial system reform in China continues to deepen,the Chinese financial market is trans-forming at an increasingly rapid pace.At the same time,a new round of technological and industrial revolution is booming.Exemplified by Big Data,cloud computing,and artificial intelligence(AI),modern information technology has become deeply integrated with economic society.New technologies not only drive progress in industry and the market,but also take root in the regulatory space.As well as issuing new standards and regulations,regulators must also deal with new risks and challenges in completely novel ways.This requires regulators to stay at the forefront of developments.
