The peak fields of HT-7U TF/PF coils are designed at 5.8 T and 4.5 T, respectively. The superconducting (SC) NbTi/Cu strands for the coils have a quite low copper fraction (0.58). To increase the ratio of the limiting...The peak fields of HT-7U TF/PF coils are designed at 5.8 T and 4.5 T, respectively. The superconducting (SC) NbTi/Cu strands for the coils have a quite low copper fraction (0.58). To increase the ratio of the limiting current Vs. critical current for the cable in conduit conductor (CICC), the first-stage subcable consists of several copper strands twisted around a SC composite one. The copper strand diameter is different from the SC one. Based on Bottura's CICC design approach we take the product of total copper cross-section and wetted perimeter as one of the key design parameters to meet with stability margin requirement. The product reaches 114 cm3 for 15.5 kA TF CICC at operating temperature of 4.2 K and 139 cm3 for 15 kA PF CICC at 3.8 K to obtain stability margins of 280 and 700 mJ/cm3, respectively.展开更多
SMART黄金原则是由Specific（具体的）、Measurable（可衡量的）、Achievable（可实现）、Realistic（可行的）和Time-based and efficiency-oriented（即时有效的）首字母缩写而成。采用该原则检视《普通高中英语课程标准（实验）》的...SMART黄金原则是由Specific（具体的）、Measurable（可衡量的）、Achievable（可实现）、Realistic（可行的）和Time-based and efficiency-oriented（即时有效的）首字母缩写而成。采用该原则检视《普通高中英语课程标准（实验）》的写作内容标准和写作教学与评价建议后，作者建议修订《普通高中英语课程标准（实验）》时要遵循上述原则，进一步制定明确的写作内容标准细则，开发或研制可衡量的英语写作评价工具，设计可实现的操作性强的英语写作任务，构建主体多元和形式多样的英语写作评价体系，指导教师如何进行即时有效的写作评价信息反馈。展开更多
文摘The peak fields of HT-7U TF/PF coils are designed at 5.8 T and 4.5 T, respectively. The superconducting (SC) NbTi/Cu strands for the coils have a quite low copper fraction (0.58). To increase the ratio of the limiting current Vs. critical current for the cable in conduit conductor (CICC), the first-stage subcable consists of several copper strands twisted around a SC composite one. The copper strand diameter is different from the SC one. Based on Bottura's CICC design approach we take the product of total copper cross-section and wetted perimeter as one of the key design parameters to meet with stability margin requirement. The product reaches 114 cm3 for 15.5 kA TF CICC at operating temperature of 4.2 K and 139 cm3 for 15 kA PF CICC at 3.8 K to obtain stability margins of 280 and 700 mJ/cm3, respectively.
文摘SMART黄金原则是由Specific（具体的）、Measurable（可衡量的）、Achievable（可实现）、Realistic（可行的）和Time-based and efficiency-oriented（即时有效的）首字母缩写而成。采用该原则检视《普通高中英语课程标准（实验）》的写作内容标准和写作教学与评价建议后，作者建议修订《普通高中英语课程标准（实验）》时要遵循上述原则，进一步制定明确的写作内容标准细则，开发或研制可衡量的英语写作评价工具，设计可实现的操作性强的英语写作任务，构建主体多元和形式多样的英语写作评价体系，指导教师如何进行即时有效的写作评价信息反馈。
