最近以来,联合国人口活动基金会(Unitedations Fund for Population Activities,简称UNFPA)通过与我有关方面的安排,开始积极参与和资助我国的计划生育、人口统计以及人口学研究与培训等项工作。从而引起了人们的注意和兴趣。为此现将...最近以来,联合国人口活动基金会(Unitedations Fund for Population Activities,简称UNFPA)通过与我有关方面的安排,开始积极参与和资助我国的计划生育、人口统计以及人口学研究与培训等项工作。从而引起了人们的注意和兴趣。为此现将该机构的情况作一简要介绍。展开更多
The determination of intrinsic deformation parameters inducing grain refinement mechanism of dynamic recrystallization (DRX) contributes to the relative forming process design. For Ni80A superalloy, the processing map...The determination of intrinsic deformation parameters inducing grain refinement mechanism of dynamic recrystallization (DRX) contributes to the relative forming process design. For Ni80A superalloy, the processing maps were constructed by the derivation of the stress-strain data coming from a series of isothermal compression tests at temperatures of 1273^-1473 K and strain rates of 0.01-10 s^-1. According to the processing maps and microstructural validation, the deformation parameter windows with DRX mechanism were separated in an innovative deformation mechanism map. In addition, the deformation activation energy representing deformation energy barrier was introduced to further optimize such windows. Finally, the enhanced processing maps were constructed and the parameter domains corresponding to DRX mechanism and lower deformation barrier were determined as follows: at ε=0.3, domains: 1296-1350 K, 0.056-0.32 s^-1 and 1350-1375 K, 0.035-0.11 s^-1;at ε=0.5, domains: 1290-1348 K, 0.2-0.5 s^-1 and 1305-1370 K, 0.035-0.2 s^-1;at ε=0.7, domains: 1290-1355 K, 0.042-0.26 s^-1;at ε=0.9, domains: 1298-1348 K, 0.037-0.224 s^-1.展开更多
In response to the recent allegation of RFA Radio Free Asia that officials in the Kuerle region of China抯 northwest Xinjiang Uygur Autonomous Region took coercive measures in implementing the family planning program,...In response to the recent allegation of RFA Radio Free Asia that officials in the Kuerle region of China抯 northwest Xinjiang Uygur Autonomous Region took coercive measures in implementing the family planning program, the National Population and Family Planning Commission (NPFPC) sent a team to Kuerle to conduct a survey. The results of the survey proved the allegations to be false. The following is a report by Dr. Liu Hongyan, a member of the team, about the survey Editor.展开更多
基金Project(cstc2018jcyj AX0459)supported by Chongqing Basic Research and Frontier Exploration,ChinaProject(P2017-020)supported by Open Fund Project of State Key Laboratory of Materials Processing and Die&Mould Technology,ChinaProject(SKLMTZZKT-2017M15)supported by Research Project of State Key Laboratory of Mechanical Transmission,China
文摘The determination of intrinsic deformation parameters inducing grain refinement mechanism of dynamic recrystallization (DRX) contributes to the relative forming process design. For Ni80A superalloy, the processing maps were constructed by the derivation of the stress-strain data coming from a series of isothermal compression tests at temperatures of 1273^-1473 K and strain rates of 0.01-10 s^-1. According to the processing maps and microstructural validation, the deformation parameter windows with DRX mechanism were separated in an innovative deformation mechanism map. In addition, the deformation activation energy representing deformation energy barrier was introduced to further optimize such windows. Finally, the enhanced processing maps were constructed and the parameter domains corresponding to DRX mechanism and lower deformation barrier were determined as follows: at ε=0.3, domains: 1296-1350 K, 0.056-0.32 s^-1 and 1350-1375 K, 0.035-0.11 s^-1;at ε=0.5, domains: 1290-1348 K, 0.2-0.5 s^-1 and 1305-1370 K, 0.035-0.2 s^-1;at ε=0.7, domains: 1290-1355 K, 0.042-0.26 s^-1;at ε=0.9, domains: 1298-1348 K, 0.037-0.224 s^-1.
文摘In response to the recent allegation of RFA Radio Free Asia that officials in the Kuerle region of China抯 northwest Xinjiang Uygur Autonomous Region took coercive measures in implementing the family planning program, the National Population and Family Planning Commission (NPFPC) sent a team to Kuerle to conduct a survey. The results of the survey proved the allegations to be false. The following is a report by Dr. Liu Hongyan, a member of the team, about the survey Editor.
