This article proposes a new physics package to enhance the frequency stability of the space cold atom clock with the advantages of a microgravity environment. Clock working processes, including atom cooling, atomic st...This article proposes a new physics package to enhance the frequency stability of the space cold atom clock with the advantages of a microgravity environment. Clock working processes, including atom cooling, atomic state preparation,microwave interrogation, and transition probability detection, are integrated into the cylindrical microwave cavity to achieve a high-performance and compact physics package for the space cold atom clock. We present the detailed design and ground-test results of the cold atom clock physics package in this article, which demonstrates a frequency stability of 1.2×10^(-12) τ^(-1/2) with a Ramsey linewidth of 12.5 Hz, and a better performance is predicted with a 1 Hz or a narrower Ramsey linewidth in microgravity environment. The miniaturized cold atom clock based on intracavity cooling has great potential for achieving space high-precision time-frequency reference in the future.展开更多
[目的]探讨胸膜孤立性纤维瘤（solitary fibrous tumor of the pleura,SFTP）的临床特点及治疗方法。[方法]回顾性分析大连医科大学附属第二医院胸外科2006年-2009年收治的10名胸膜孤立性纤维瘤患者的临床资料,10例患者均行手术切除肿瘤...[目的]探讨胸膜孤立性纤维瘤（solitary fibrous tumor of the pleura,SFTP）的临床特点及治疗方法。[方法]回顾性分析大连医科大学附属第二医院胸外科2006年-2009年收治的10名胸膜孤立性纤维瘤患者的临床资料,10例患者均行手术切除肿瘤,其中2例术前行介入栓塞治疗,术后肿瘤组织行病理检查及免疫组化分析。[结果]病理检查提示肿瘤组织主要由梭形细胞和胶原纤维组成,免疫组化分析CD34、Vimentin、Bc1-2均为阳性表达,CD99部分阳性表达（2例）。10例患者中,术前行介入栓塞治疗的2名患者术中出血明显减少;术后病理诊断均为胸膜孤立性纤维瘤,术后随访8个月-2年,效果良好迄今为止,未发现肿瘤转移复发。[结论]手术是目前治疗SFTP的最佳方法,术前行介入治疗能够有效地减少术中出血。免疫组化对该病的诊断具有重要价值。展开更多
基金Project supported by the Space Application System of China Manned Space Programthe Youth Innovation Promotion Association,CAS。
文摘This article proposes a new physics package to enhance the frequency stability of the space cold atom clock with the advantages of a microgravity environment. Clock working processes, including atom cooling, atomic state preparation,microwave interrogation, and transition probability detection, are integrated into the cylindrical microwave cavity to achieve a high-performance and compact physics package for the space cold atom clock. We present the detailed design and ground-test results of the cold atom clock physics package in this article, which demonstrates a frequency stability of 1.2×10^(-12) τ^(-1/2) with a Ramsey linewidth of 12.5 Hz, and a better performance is predicted with a 1 Hz or a narrower Ramsey linewidth in microgravity environment. The miniaturized cold atom clock based on intracavity cooling has great potential for achieving space high-precision time-frequency reference in the future.
文摘[目的]探讨胸膜孤立性纤维瘤（solitary fibrous tumor of the pleura,SFTP）的临床特点及治疗方法。[方法]回顾性分析大连医科大学附属第二医院胸外科2006年-2009年收治的10名胸膜孤立性纤维瘤患者的临床资料,10例患者均行手术切除肿瘤,其中2例术前行介入栓塞治疗,术后肿瘤组织行病理检查及免疫组化分析。[结果]病理检查提示肿瘤组织主要由梭形细胞和胶原纤维组成,免疫组化分析CD34、Vimentin、Bc1-2均为阳性表达,CD99部分阳性表达（2例）。10例患者中,术前行介入栓塞治疗的2名患者术中出血明显减少;术后病理诊断均为胸膜孤立性纤维瘤,术后随访8个月-2年,效果良好迄今为止,未发现肿瘤转移复发。[结论]手术是目前治疗SFTP的最佳方法,术前行介入治疗能够有效地减少术中出血。免疫组化对该病的诊断具有重要价值。
