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Disappearance of Superconductivity and a Concomitant lifshitz Transition in Heavily Overdoped Bi_2Sr_2CuO_6 Superconductor Revealed by Angle-Resolved Photoemission Spectroscopy

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Chinese Physics Letters 2019年第1期36卷 60-64页

作者： ying Ding lin Zhao Hong-tao yan Qiang Gao Jing liu Cheng Hu jian-Wei Huang Cong li Yu xu Yong-Qing Cai Hong-Wao Rong Ding-Song Wu Chun-Yao Song Hua-xue Zhou Xiao-li Dong Guo-Dong liu Qing-yan Wang shen-Jin Zhang Zhi-Min Wang Feng-Feng Zhang Feng yang Qin-junpeng Zu-yan xu Chuang-Tian Chen X.J.Zhou beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Technical institute of Physics and Chemistry Chinese Academy of Sciences Collaborative Innovation Center of Quantum Matter

By partially doping Pb to effectively suppress the superstructure in single-layered cuprate Bi_2Sr_2CuO_(6+δ)(Pb-Bi2201) and annealing them in vacuum or in high pressure oxygen atmosphere, a series of high quality Pb-Bi2201 single crystals are obtained with T_c covering from 17 K to non-superconducting in the overdoped region. High resolution angle resolved photoemission spectroscopy measurements are carried out on these samples to investigate the evolution of the Fermi surface topology with doping in the normal state. Clear and complete Fermi surfaces are observed and quantitatively analyzed in all of these overdoped Pb-Bi2201 samples. A lifshitz transition from holelike Fermi surface to electron-like Fermi surface with increasing doping is observed at a doping level of ~0.35. This transition coincides with the change that the sample undergoes superconducting-to-non-superconducting *** results reveal the emergence of an electron-like Fermi surface and the existence of a lifshitz transition in heavily overdoped Bi2201 samples. This provides important information in understanding the connection between the disappearance of superconductivity and the lifshitz transition in the overdoped region.

关键词： Angular resolved light emission spectrometry Concomitant lifshitz Transition Bi2Sr2CuO6

Chinese expert consensus on conversion therapy for hepatocellular carcinoma(2021 edition)

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Hepatobiliary Surgery and Nutrition 2022年第2期11卷 227-252,I0011-I0014页

作者： Hui-Chuan Sun jian Zhou Zheng Wang Xiufeng liu Qing Xie Weidong Jia Ming Zhao Xinyu Bi Gong li xueli Bai Yuan Ji li xu Xiao-Dong Zhu Dousheng Bai Yajin Chen Yongjun Chen Chaoliu Dai Rongping Guo Wenzhi Guo Chunyi Hao tao Huang Zhiyong Huang Deyu li Gang li tao li Xiangcheng li Guangming li Xiao liang Jingfeng liu Fubao liu Shichun Lu Zheng Lu Weifu Lv Yilei Mao Guoliang Shao yinghong Shi Tianqiang Song Guang Tan Yunqiang Tang Kaishan tao Chidan Wan Guangyi Wang Lu Wang Shunxiang Wang Tianfu Wen Baocai Xing Bangde Xiang sheng yan Dinghua yang Guowen yin tao yin Zhenyu yin Zhengping Yu Bixiang Zhang Jialin Zhang Shuijun Zhang Ti Zhang Yamin Zhang Yubao Zhang Aibin Zhang Haitao Zhao Ledu Zhou Wu Zhang Zhenyu Zhu Shukui Qin Feng shen Xiujun Cai Gaojun Teng jianqiang Cai Minshan Chen Qiang li lianxin liu Weilin Wang Tingbo liang Jiahong Dong Xiaoping Chen xuehao Wang Shusen Zheng Jia Fan 无 Department of liver Surgery and Transplantation Liver Cancer InstituteZhongshan HospitalFudan UniversityShanghaiChina Department of Medical Oncology of PLA Cancer Center Jinling HospitalNanjingChina Department of Infectious Disease Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Department of liver Surgery The First Affiliated Hospital of USTCHefeiChina Minimally Invasive Interventional Division Sun Yat-sen University Cancer CenterGuangzhouChina Department of Hepatobiliary Surgery National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina Department of Radiation Oncology Beijing Tsinghua Changgung HospitalBeijingChina Department of Hepatobiliary and Pancreatic Surgery the First Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhouChina Department of Pathology Fudan University Shanghai Cancer CentreShanghaiChina Department of liver Surgery Sun Yat-sen University Cancer CentreGuangzhouChina Department of Hepatobiliary Surgery Clinical Medical CollegeYangzhou UniversityYangzhouChina Department of Hepatobiliopancreatic Surgery Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhouChina Division of Hepatobiliary Surgery Department of General SurgeryRuijin HospitalShanghai Jiaotong University School of MedicineShanghaiChina Department of Hepatobiliary and Splenic Surgery Shengjing Hospital Affiliated to China Medical UniversityShenyangChina The Department of Hepatobiliary Oncology of Sun Yat-sen University Cancer Center State Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineGuangzhouChina Department of Hepatobiliary and Pancreatic Surgery The First Affiliated Hospital of Zhengzhou UniversityZhengzhouChina Key Laboratory of Carcinogenesis and Translational research(Ministry of Education) Sarcoma CenterPeking University Cancer Hospital and InstituteBeijingChina Department of Hepatobili

Recent advances in systemic and locoregional treatments for patients with unresectable or advanced hepatocellular carcinoma(HCC)have resulted in improved response *** has provided an opportunity for selected patients with initially unresectable HCC to achieve adequate tumor downstaging to undergo surgical resection,a‘conversion therapy’***,conversion therapy is a new approach to the treatment of HCC and its practice and treatment protocols are still being *** the evidence for conversion therapy in HCC and develop consensus statements to guide clinical *** review:Many research centers in china have accumulated significant experience implementing HCC conversion *** findings and data have shown that conversion therapy represents an important strategy to maximize the survival of selected patients with intermediate stage to advanced HCC;however,there are still many urgent clinical and scientific challenges for this therapeutic strategy and its related *** order to summarize and learn from past experience and review current challenges,the Chinese Expert Consensus on Conversion Therapy for Hepatocellular Carcinoma(2021 Edition)was developed based on a review of preliminary experience and clinical data from Chinese and non-Chinese studies in this field and combined with recommendations for clinical *** consensus statements on the implementation of conversion therapy for HCC were *** statements generated in this review are based on a review of clinical evidence and real clinical experience and will help guide future progress in conversion therapy for patients with HCC.

关键词： Hepatocellular carcinoma(HCC) conversion therapy surgical resection systematic treatment locoregional treatment consensus china

DZ125L合金后挡块机械加工裂纹成因分析

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有色矿冶 2019年第1期35卷 39-41页

作者：董茵常涛歧李琳刘晓飞陈杰周宝玲王斌赵剑恒郭金花祝洋洋刘恩泽西安中航动力精密铸造有限公司陕西西安710021 航天科工防御技术研究试验中心北京100000 中国科学院金属研究所辽宁沈阳110016

采用DZ125L合金制备某型航空发动机后挡块时,发现经机械加工后工件大批量产生磨削裂纹缺陷。通过化学成分分析、扫描电镜(SEM)、能谱分析(EDS)等方法,对裂纹的形成原因进行了研究。分析其主要原因是由于合金在真空浇铸过程中,合金熔炼... 详细信息

采用DZ125L合金制备某型航空发动机后挡块时,发现经机械加工后工件大批量产生磨削裂纹缺陷。通过化学成分分析、扫描电镜(SEM)、能谱分析(EDS)等方法,对裂纹的形成原因进行了研究。分析其主要原因是由于合金在真空浇铸过程中,合金熔炼真空度过低,或者型壳放置过久内部型面剥落,导致合金中存在大量Al2O3夹杂物所引起的。采用新的型壳并在真空度高于1×10-1条件下浇铸即可避免此类缺陷产生。

关键词： DZ125L合金机械加工裂纹高温合金航空发动机

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碳/碳复合材料作为发热体构件的电性能研究

有色矿冶 2019年第2期35卷 42-44页

作者：李琳赵剑恒常涛歧陈杰董茵刘晓飞刘恩泽郭金花西安航发精密铸造有限公司陕西西安710021 中国科学院金属研究所辽宁沈阳110016 航天科工防御技术研究试验中心北京100000

碳/碳复合材料作为发热元件在真空熔炼设备上得到显著的应用。本文利用ALD真空冶炼设备对不同密度碳/碳复合材料发热体的电阻进行了测定。研究发现,碳/碳复合材料发热体自身电阻随着温度的增加而显著降低;其电阻与自身密度有着紧密关系... 详细信息

碳/碳复合材料作为发热元件在真空熔炼设备上得到显著的应用。本文利用ALD真空冶炼设备对不同密度碳/碳复合材料发热体的电阻进行了测定。研究发现,碳/碳复合材料发热体自身电阻随着温度的增加而显著降低;其电阻与自身密度有着紧密关系,相同外型和尺寸的发热体,密度越高电阻越低。

关键词：碳/碳复合材料电阻密度温度

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DZ125合金涡轮叶片表面点状缺陷分析

有色矿冶 2019年第1期35卷 42-45页

作者：赵剑恒李琳常涛歧刘晓飞陈杰董茵王斌郭金花郑力玮刘恩泽西安中航动力精密铸造有限公司陕西西安710021 航天科工防御技术研究试验中心北京100000 中国科学院金属研究所辽宁沈阳110016

利用扫描电镜(SEM)及其附带的X射线能谱仪分析了DZ125合金叶片表面"墨点"缺陷分布区域和类型,发现夹杂物主要分布在叶背上,且缺陷由三种类型的氧化物构成:第一种为HfO_2,第二种为Al_2O_3,第三种为SiO_2。产生墨点缺陷的原因有二:一是DZ... 详细信息

利用扫描电镜(SEM)及其附带的X射线能谱仪分析了DZ125合金叶片表面"墨点"缺陷分布区域和类型,发现夹杂物主要分布在叶背上,且缺陷由三种类型的氧化物构成:第一种为HfO_2,第二种为Al_2O_3,第三种为SiO_2。产生墨点缺陷的原因有二:一是DZ125合金中含有的活泼元素Hf在高温下与型壳材料发生反应;二是型砂中碱金属氧化物超标。

关键词： DZ125合金夹杂物墨点缺陷界面反应