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Bunch-length measurement at a bunch-by-bunch rate based on time–frequency-domain joint analysis techniques and its application

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Nuclear Science and Techniques 2024年第4期35卷 165-175页

作者： Hong-Shuang Wang Xing Yang Yong-Bin Leng Yi-Mei Zhou ji-gang Wang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China

This paper presents a new technique for measuring the bunch length of a high-energy electron beam at a bunch-by-bunch rate in storage *** technique uses the time–frequency-domain joint analysis of the bunch signal to obtain bunch-by-bunch and turn-by-turn longitudinal parameters,such as bunch length and synchronous *** bunch signal is obtained using a button electrode with a bandwidth of several *** data acquisition device was a high-speed digital oscilloscope with a sampling rate of more than 10 GS/s,and the single-shot sampling data buffer covered thousands of *** bunch-length and synchronous phase information were extracted via offline calculations using Python *** calibration coefficient of the system was determined using a commercial streak ***,this technique was tested on two different storage rings and successfully captured various longitudinal transient processes during the harmonic cavity debugging process at the Shanghai Synchrotron Radiation Facility(SSRF),and longitudinal instabilities were observed during the single-bunch accumulation process at Hefei Light Source(HLS).For Gaussian-distribution bunches,the uncertainty of the bunch phase obtained using this technique was better than 0.2 ps,and the bunch-length uncertainty was better than 1 *** dynamic range exceeded 10 *** technology is a powerful and versatile beam diagnostic tool that can be conveniently deployed in high-energy electron storage rings.

关键词： Bunch-by-bunch diagnostic Bunch-length measurement Synchronous phase measurement Joint time–frequency-domain analysis Longitudinal instability

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Clinical feasibility of laparoscopic left lateral segment liver resection with magnetic anchor technique:The first clinical study from China

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World Journal of Gastrointestinal Surgery 2024年第5期16卷 1336-1343页

作者： Miao-Miao Zhang ji-gang Bai Dong Zhang jie Tao Zhi-Min Geng Zhuo-Qun Li Yu-Xiang Ren Yu-HanZhang Yi Lyu Xiao-Peng Yan Department of Hepatobiliary Surgery The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061Shaanxi ProvinceChina Shaanxi Provincial Key Laboratory of Magnetic Medicine The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061Shaanxi ProvinceChina Zonglian College Xi’an Jiaotong UniversityXi’an 710061Shaanxi ProvinceChina Qide College Xi’an Jiaotong UniversityXi’an 710061Shaanxi ProvinceChina

BACKGROUND Magnetic anchor technique(MAT)has been applied in laparoscopic cholecystectomy and laparoscopic appendectomy,but has not been reported in laparoscopic partial *** To evaluate the feasibility of the MAT in laparoscopic left lateral segment liver *** Retrospective analysis was conducted on the clinical data of eight patients who underwent laparoscopic left lateral segment liver resection assisted by MAT in our department from July 2020 to November *** Y-Z magnetic anchor devices(Y-Z MADs)was independently designed and developed by the author of this paper,which consists of the anchor magnet and magnetic grasping *** time,intraoperative blood loss,intraoperative accidents,operator experience,postoperative incision pain score,postoperative complications,and other indicators were evaluated and *** All eight patients underwent a MAT-assisted laparoscopic left lateral segment liver resection,including three patients undertaking conventional 5-port and five patients having a transumbilical single-port *** mean operation time was 138±34.32 min(range 95-185 min)and the mean intraoperative blood loss was 123±88.60 mL(range 20-300 mL).No adverse events occurred during the *** Y-Z MADs showed good workability and maneuverability in both tissue and organ *** particular,the operators did not experience either a“chopstick”or“sword-fight”effect in the single-port laparoscopic *** The results show that the MAT is safe and feasible for laparoscopic left lateral segment liver resection,especially,exhibits its unique abettance for transumbilical single-port laparoscopic left lateral segment liver resection.

关键词： Magnetosurgery/magnetic surgery Magnetic anchor technique Laparoscopic hepatectomy Transumbilical singleport laparoscopy Magnet

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Measurement of atmospheric non-reciprocity effects for satellite-based two-way time-frequency transfer

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Photonics Research 2024年第6期12卷 1274-1282页

作者： TING ZENG QI SHEN YUAN CAO jiAN-YU GUAN MENG-ZHE LIAN jiN-jiAN HAN LEI HOU jiAN LU XIN-XIN PENG MIN LI WEI-YUE LIU jiN-CAI WU YONG WANG JUAN YIN ji-gang REN HAI-FENG jiANG QIANG ZHANG CHENG-ZHI PENG jiAN-WEI PAN Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaShanghai 201315China Hefei National Laboratory University of Science and Technology of ChinaHefei 230094China Faculty of Information Science and Engineering Ningbo UniversityNingbo 315211China Key Laboratory of Space Active Opto-Electronic Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China

Future optical clock networks will require high-precision optical time-frequency transfer between satellites and ground ***,due to atmospheric turbulence,satellite motion and time delay between the satellite–ground transmission links will cause spatial and temporal variations,respectively,resulting in the breakdown of the time-of-flight reciprocity on which optical two-way time-frequency transfer is ***,we experimentally simulate the atmospheric effects by two-way spatio-temporally separated links between two stationary terminals located 113 km apart and measure the effects for optical two-way time-frequency *** experiment shows that the effect on the link instability is less than 2.3×10^(−19) at 10,000 *** indicates that when the link instability of satellite-ground optical time-frequency transfer is on the order of 10^(−19),it is not necessary to consider the atmospheric non-reciprocity effects.

关键词： breakdown transfer satellite

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Machine learning identifies the risk of complications after laparoscopic radical gastrectomy for gastric cancer

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World Journal of Gastroenterology 2024年第1期30卷 79-90页

作者： Qing-Qi Hong Su Yan Yong-Liang Zhao Lin Fan Li Yang Wen-Bin Zhang Hao Liu He-Xin Lin jian Zhang Zhi-jian Ye Xian Shen Li-Sheng Cai Guo-Wei Zhang jia-Ming Zhu gang ji jin-Ping Chen Wei Wang Zheng-Rong Li jing-Tao Zhu Guo-Xin Li Jun You Department of Gastrointestinal Oncology Surgery The First Affiliated Hospital of Xiamen UniversitySchool of MedicineXiamen 361001Fujian ProvinceChina Department of Gastrointestinal Surgery Qinghai University Affiliated HospitalXining 810000Qinghai ProvinceChina Department of General Surgery and Center of Minimal Invasive Gastrointestinal Surgery The First Hospital Affiliated to Army Medical UniversityChongqing 400038China Department of General Surgery The First Affiliated Hospital of Xi'an Jiaotong UniversityXi'an 710061Shaanxi ProvinceChina Department of General Surgery The First Affiliated Hospital of Nanjing Medical UniversityNanjing 210029Jiangsu ProvinceChina Department of Gastrointestinal Surgery The First Affiliated Hospital of Xinjiang Medical UniversityUrmuqi 830054Xinjiang Uygur Autonomous RegionChina Department of General Surgery Nanfang HospitalSouthern Medical UniversityGuangzhou 510515Guangdong ProvinceChina Department of Gastrointestinal Surgery Affiliated Hangzhou First People's HospitalZhejiang University School of MedicineHangzhou 310006Zhejiang ProvinceChina Department of Gastrointestinal Surgery Zhongshan Hospital of Xiamen UniversityXiamen 361004Fujian ProvinceChina Department of Surgery The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhou 325027Zhejiang ProvinceChina Department of General Surgery Unit 4 Zhangzhou Affiliated Hospital of Fujian Medical UniversityZhangzhou 363000Fujian ProvinceChina Department of Gastrointestinal Surgery The Second Affiliated Hospital of Xiamen Medical CollegeXiamen 361021Fujian ProvinceChina Department of Gastrointestinal Nutrition and Hernia Surgery The Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina Department of Digestive Diseases Xijing HospitalAir Force Military Medical UniversityXi'an 710032Shaanxi ProvinceChina Department of Gastrointestinal Surgery Quanzhou First Hospital Affiliated to Fujian Medical UniversityQuanzhou 362002Fujian Provin

BACKGROUND Laparoscopic radical gastrectomy is widely used,and perioperative complications have become a highly concerned *** To develop a predictive model for complications in laparoscopic radical gastrectomy for gastric cancer to better predict the likelihood of complications in gastric cancer patients within 30 days after surgery,guide perioperative treatment strategies for gastric cancer patients,and prevent serious *** In total,998 patients who underwent laparoscopic radical gastrectomy for gastric cancer at 16 Chinese medical centers were included in the training group for the complication model,and 398 patients were included in the validation *** clinicopathological data and 30-d postoperative complications of gastric cancer patients were *** machine learning methods,lasso regression,random forest,and artificial neural networks,were used to construct postoperative complication prediction models for laparoscopic distal gastrectomy and laparoscopic total gastrectomy,and their prediction efficacy and accuracy were *** The constructed complication model,particularly the random forest model,could better predict serious complications in gastric cancer patients undergoing laparoscopic radical *** exhibited stable performance in external validation and is worthy of further promotion in more *** Using the risk factors identified in multicenter datasets,highly sensitive risk prediction models for complications following laparoscopic radical gastrectomy were *** hope to facilitate the diagnosis and treatment of preoperative and postoperative decision-making by using these models.

关键词： Gastric cancer Laparoscopic radical gastrectomy Postoperative complications Laparoscopic total gastrectomy

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基于经济增长视角的山东省新旧动能转换效果评估

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经济与管理评论 2024年第2期40卷 43-58页

作者：许月恒刘德军冀刚山东省宏观经济研究院山东济南250014

坚定不移推动新旧动能转换,是当前山东省推动经济高质量发展的重要任务。基于2008-2021年我国30个省级行政区的面板数据,将除山东省以外的其他省(区、市)作为潜在控制组,从经济增长的视角,采用合成控制法,对山东省新旧动能转换重大工程... 详细信息

坚定不移推动新旧动能转换,是当前山东省推动经济高质量发展的重要任务。基于2008-2021年我国30个省级行政区的面板数据,将除山东省以外的其他省(区、市)作为潜在控制组,从经济增长的视角,采用合成控制法,对山东省新旧动能转换重大工程的实施效果进行评估。结果表明,从整体上来说,新旧动能转换重大工程的实施对山东省经济增长具有显著的促进作用,但这种作用的显现具有时间滞后性,并且不同因素对山东省新旧动能转换重大工程的影响具有差异性。因此,要深刻认识和把握新旧动能转换的演进过程,大力推动供需两侧新动能培育和成长等。

关键词：新旧动能转换高质量发展经济增长合成控制法

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葡萄柚外泌体样囊泡抗黑色素功效研究

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中国医药生物技术 2024年第2期19卷 108-115页

作者：雷继刚时比曼生物科技(上海)有限公司上海201210

目的探究葡萄柚外泌体样囊泡对小鼠皮肤黑色素瘤细胞及斑马鱼黑色素合成的影响,以获取一款安全有效的天然皮肤美白剂。方法差速离心与超速离心相结合的方法分离葡萄柚来源的外泌体样囊泡,通过纳米粒子追踪分析仪检测该囊泡的粒径、浓... 详细信息

目的探究葡萄柚外泌体样囊泡对小鼠皮肤黑色素瘤细胞及斑马鱼黑色素合成的影响,以获取一款安全有效的天然皮肤美白剂。方法差速离心与超速离心相结合的方法分离葡萄柚来源的外泌体样囊泡,通过纳米粒子追踪分析仪检测该囊泡的粒径、浓度和Zeta电位;同时,采用透射电子显微镜检测该囊泡的形态完整性。通过CCK8法检测不同浓度葡萄柚来源的外泌体样囊泡处理的人成纤维细胞HFF-1和人角质形成细胞HaCaT活力,评估该囊泡的毒性。采用小鼠皮肤黑色素瘤细胞B16F10和斑马鱼幼鱼进行葡萄柚来源的外泌体样囊泡的美白功效研究。采用过氧化氢诱导的HFF-1和HaCaT的氧化损伤模型,探究该囊泡的抗氧化作用。最后,采用高效液相色谱-质谱法检测葡萄柚外泌体样囊泡中内含物成分。结果分离到的葡萄柚来源的外泌体样囊泡粒径较小、浓度较高、产量与纯度也较高,且囊泡形态结构完整。毒性实验结果显示其对HFF-1和HaCaT均无毒性作用。体内外研究结果显示,葡萄柚外泌体样囊泡可显著抑制B16F10细胞和斑马鱼幼鱼的黑色素生成。初步的机制研究结果显示,该囊泡富含多种黄酮类物质,对HFF-1和HaCaT细胞均具有显著的抗氧化作用。结论葡萄柚外泌体样囊泡富含多种具有抗氧化作用的黄酮类物质,对人皮肤来源的细胞无毒性,且具有显著的美白功效。因此,该囊泡在美白祛斑护肤品领域中具有很好的应用潜能。

关键词：外泌体橙皮苷黑色素抗氧化斑马鱼

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多途混响环境中声扩频信号线性与相关性分析

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国防科技大学学报 2024年第4期46卷 191-200页

作者：唐永壮周其斗谢志勇吕晓军纪刚海军工程大学舰船与海洋学院湖北武汉430033

为分析浅海多途信道中声扩频信号的相关性和线性,建立了计入频率衰减与海底损耗的浅海Pekeris波导虚源法计算模型;对浅海中的脉冲信号与扩频信号进行了仿真计算,通过混响室试验初步研究了多途混响环境中扩频信号的线性。仿真结果显示:... 详细信息

为分析浅海多途信道中声扩频信号的相关性和线性,建立了计入频率衰减与海底损耗的浅海Pekeris波导虚源法计算模型;对浅海中的脉冲信号与扩频信号进行了仿真计算,通过混响室试验初步研究了多途混响环境中扩频信号的线性。仿真结果显示:虚源法和简正波法的频域解一致,得到了与简正波理论相同的低频模式频散现象,验证了虚源法适用于浅海理想波导、Pekeris波导中的低频问题;当发生模式频散,低频扩频信号的相关性能强于同扩频参数的高频信号。试验结果表明:低频脉冲的时域波形发生畸变、展宽时,同频率的扩频信号能准确测出反射信号的几何时延,证明了低频多途效果仍可看作每个“路径”信号的线性叠加。

关键词：低频扩频信号浅海多途虚源法模式频散相关性

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数字孪生灌区研究与应用

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海河水利 2024年第5期 123-128页

作者：赵继刚张慧祁县昌源河水利服务中心山西祁县030900 山西省能源互联网研究院山西太原030000

以山西省晋中市祁县昌源河灌区为研究对象,探讨了数字孪生技术在灌区管理中的应用及其带来的社会效益。介绍了当前灌区信息化现状和数字孪生模型优势,详细阐述了数字孪生灌区的总体框架和落地功能模块。通过案例验证,数字孪生灌区应用... 详细信息

以山西省晋中市祁县昌源河灌区为研究对象,探讨了数字孪生技术在灌区管理中的应用及其带来的社会效益。介绍了当前灌区信息化现状和数字孪生模型优势,详细阐述了数字孪生灌区的总体框架和落地功能模块。通过案例验证,数字孪生灌区应用能够提高水资源利用效率、实现灌溉管理的智能化和决策的科学化。本研究成果可以为数字孪生灌区的深入应用指明方向。

关键词：祁县昌源河数字孪生信息化灌区

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SCADA系统在能源供应系统中的应用研究

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自动化仪表 2024年第7期45卷 1-5页

作者：纪纲刘胜军上海同欣自动化仪表有限公司上海200070 中石化天津分公司天津300270

随着我国节能环保事业的发展和公用事业的进步,以及计算机技术、通信技术、互联网技术的成熟,数据采集与监视控制(SCADA)系统的应用获得了飞跃式发展。在能源供应领域,SCADA系统的应用从代替人工上门抄表、人工统计计算、人工现场巡查,... 详细信息

随着我国节能环保事业的发展和公用事业的进步,以及计算机技术、通信技术、互联网技术的成熟,数据采集与监视控制(SCADA)系统的应用获得了飞跃式发展。在能源供应领域,SCADA系统的应用从代替人工上门抄表、人工统计计算、人工现场巡查,发展到复杂的统计分析以及对能源供应系统进行全面的监控,在实施“双碳行动”中发挥着重要作用。首先,阐述了能源供应SCADA系统的基本功能。然后,列举了通过SCADA系统实现能源管网管理的增强功能和应用效果。最后,归纳总结了SCADA系统的发展趋势。SCADA系统在能源供应系统中的应用,对“双碳”目标的实现具有积极促进作用。

关键词：数据采集与监视控制能源供应系统供热网数据采集实时监控最佳工况效益最大化节能

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臂式水溶性Meso-四(磺酸丁氧基)苯基卟啉的合成及催化氧化

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化学研究与应用 2024年第8期36卷 1829-1839页

作者：潘继刚郭昕王斌黄月君山西大学化学化工学院山西太原030006 山西药科职业学院药学系山西太原030031

本文以Meso-四羟基苯基卟啉为起始物,通过与1,4-丁磺酸内酯反应,制备了未见文献报道的臂式水溶性Meso-四(磺酸丁氧基)苯基卟啉,通过^(1)H NMR、^(13)C NMR、紫外吸收光谱、荧光光谱及质谱对该卟啉化合物的结构进行了表征。探索了该卟啉... 详细信息

本文以Meso-四羟基苯基卟啉为起始物,通过与1,4-丁磺酸内酯反应,制备了未见文献报道的臂式水溶性Meso-四(磺酸丁氧基)苯基卟啉,通过^(1)H NMR、^(13)C NMR、紫外吸收光谱、荧光光谱及质谱对该卟啉化合物的结构进行了表征。探索了该卟啉化合物作为光敏催化剂,在过氧化氢作为氧源的条件下,对萘二酚类化合物进行催化氧化。研究结果表明:其催化2,3-萘二酚及1,5-萘二酚的氧化效果良好,催化氧化活性随着pH值的降低、光源功率的增加以及反应温度的升高而增大,活性炭负载Meso-四(磺酸丁氧基)苯基卟啉形成的催化剂也表现出很好的催化活性。

关键词： Meso-四(磺酸丁氧基)苯基卟啉合成萘二酚类化合物催化氧化

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