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Chip-based quantum communications

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Journal of Semiconductors 2021年第9期42卷 29-36页

作者： Qingqing Wang Yun Zheng Chonghao Zhai xudong li Qihuang Gong Jianwei Wang State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Frontiers Science Center for Nano-optoelectronics and Collaborative Innovation Center of Quantum Matter Peking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China

Quantum communications aim to share encryption keys between the transmitters and receivers governed by the laws of quantum *** quantum photonics offers significant advantages of dense integration,high stability and scalability,which enables a vital platform for the implementation of quantum information processing and quantum *** article reviews recent experimental progress and advances in the development of integrated quantum photonic devices and systems for quantum communications and quantum networks.

关键词： quantum communications quantum networks integrated quantum photonics

An Integrated-Plasmonic Chip of Bragg Reflection and Mach-Zehnder Interference Based on Metal-Insulator-Metal Waveguide

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Photonic Sensors 2022年第3期12卷 58-67页

作者： liang ZENG Jiaqi li Chengyi CAO xudong li Xinyuan ZENG Quanhao YU Kunhua WEN Jun YANG Yuwen QIN School of Physics and Optoelectronic Engineering Guangdong University of TechnologyGuangzhou 510006China School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of TechnologyGuangzhou 510006China

In this paper,a Bragg reflector is proposed by placing periodic metallic gratings in the center of a metal-insulator-metal(MIM)*** to the effective refractive index modulation caused by different waveguide widths in a period,a reflection channel with a large bandwidth is firstly ***,the Mach-Zehnder interference(MZI)effect arises by shifting the gratings away from the waveguide *** to different optical paths with unequal indices on both sides of the grating,a narrow MZI band gap will be *** is interesting to find out that the Bragg reflector and Mach-Zehnder interferometer are immune to each other,and their wavelengths can be manipulated by the period and the grating length,***,we can obtain three MZI channels and one Bragg reflection channel by integrating three different gratings into a large *** performances are investigated by finite-difference time-domain(FDTD)*** the index range of 1.33–1.36,the maximum sensitivity for the structure is as high as 1500 nm/RIU,and it is believed that this proposed structure can find widely applications in the chip-scale optical communication and sensing areas.

关键词： Bragg reflector metal-insulator-metal Mach-Zehnder interference effective refractive index modulation

Left-turn-acr oss-path-fr om-opposite-direction accidents in China:CIDAS accident study

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Transportation Safety and Environment 2023年第4期5卷 78-90页

作者： Yong Chen Christian Buerger Miao lin xudong li Volker Labenski Haixia Jin Hai Wang Yang liu Tsuyoshi Ino Harald Feifel Tian Tan Fangrong Chang Volkswagen(China)Investment Co. Ltd.12 Qisheng Mid StreetChaoyang DistrictBeijing 100020China China Automotive Technology&Research Center(CATARC) 188 South 4th Ring Road WestFengtai DistrictBeijing 100071China Audi AG Ettinger Strasse85045 IngolstadtGermany ZF Automotive Technologies(Shanghai)Co. Ltd.366 Taibo RoadJiading DistrictShanghai 201800China DENSO Corporation 1-1Showa-choKariyaAichi 448-8661Japan Continental Teves AG Guerickestrasse 760488 Frankfurtam MainGermany Continental Automotive Systems(Shanghai)Co. Ltd.100 Huirong RoadJiading Industrial ZoneShanghai 201800China School of Resources and Safety Engineering Central South UniversityChangsha 410083HunanChina

Left-turn-across-path-from-opposite-direction(LTAP/OD)conflicts are one of the most common crash types at *** research aims to reveal the general and dynamic information about the conflict for the most relevant street layouts for each conflict configuration of the LTAP/OD accidents involving passenger cars,motorcycles and *** analysis was based on 276 LTAP/OD 157 car-to-motorcycle conflicts and 75 car-to-Ebike *** accidents belonging to the three types were observed at the wo accidents collected by the China in-depth accident study(CIDAS 2011-2019).The LTAP/OD accidents include 44 car-to-car *** layout without a green belt separating the oncoming lane and no offset lane between the turning car and the oncoming traffic,the main distance between both vehicles in the beginning of the critical situation being about four metres,occurring in the clear day with no rain and at junctions lighted either because of daylight or based on street *** terms of the turning car initial speed,the range is 15-30 km/h for most car-to-car and car-to-motorcycle accidents,but 30-40 km/h for most car-to-Ebike *** for the collision speed,this range is between10 km/h and 20km/h for car-to-car and car-to-Ebike accidents and between10 km/h and passenger cars,the maximum longitudinal distance is 60 m for both types of accidents and the maximum lateral distance ranges 25 km/h for car-to-motorcycle *** on the distributions of objective motorcycles’and Ebikes'positions in collisions with from -20 m to 20m and from -15 m to 15 m,respectively.

关键词： turning separating lighting

Expression of partial tandem duplication of mixed lineage leukaemia in patients with acute leukaemia and their relatives

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Chinese Medical Journal 2014年第2期127卷 284-289页

作者： He Yi Wang Dongning li xudong Hu Yuan Wang Wenwen Huang Renwei Department of Haematology Third Affiliated Hospital of Sun Yat-sen University Guangzhou Guangdong 510630 China

Background Partial tandem duplication of mixed lineage leukaemia （MLL-PTD） is detected both in patients with acute leukemia and in healthy ***,MLL-PTD in relatives of patients with MLL-PTD has not been *** objective of this study was to investigate the expression of MLL-PTD in patients with acute leukemia and in their *** The bone marrow or peripheral blood was collected from patients with acute leukaemia and their *** reverse transcription-polymerase chain reaction （RT-PCR） was applied to detect the mRNA expression of the MLL-PTD fused gene,and further confirm in genomic DNA *** Analysing MLL-PTD in case 1,the patient＇s older brother and his younger brother were positive,while his mother and his son were *** exon type in case 1 was e9/3 fusion,but in his older brother,it was e9/3 and e11/3 fusion,and in his younger brother,it was e9/3,e10/3,and e11/3 ***-PTD in case 2 was negative,but in the patient＇s older sister was positive,and the exon type was e9/3,e10/3,and e11/*** The expression of MLL-PTD was present in cases with acute leukaemia with a single expression ***,various expression types were detected in their healthy ***-PTD can couple with other chromosome aberrations,and its impact on disease prognosis remains to be studied further.

关键词： MLL-PTD leukaemia healthy population transplantation chromosome aberration

Prognostic Factors Predicting the Postoperative Survival Period Following Treatment for Primary Retroperitoneal liposarcoma

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Chinese Medical Journal 2015年第1期128卷 85-90页

作者： xudong Zhao Peiyu li Xiaohui Huang lin Chen Na liu Yaoguang She Department of General Surgery General Hospital of Chinese People's Liberation Army Beijing 100853 China

Background：liposarcomas,which represent 20% of all adult sarcomas,are the most common histological type of malignant soft tissue *** aim of this study was to define the prognostic factors that predict the postoperative survival period for patients with primary retroperitoneal liposarcoma.Methods：The clinical data and prognoses of 71 patients with primary retroperitoneal liposarcoma who were treated in the General Hospital of the People＇s liberation Army of China between January 1,2000 and December 31,2007 were retrospectively reviewed and analyzed.Results：The primary tumor from each patient was resected; 54.9% （39/71） were deemed R0 resections,31.0% （22/71） were R1 resections and 14.1% （10/7 l） were deemed R2 resections （palliative operations）.The median follow up was 68 months （range：1-160 months）.Of the patients who received an R1 or R2 resection of their primary tumor,96.7% （59/61） had tumor *** 1-year,3-year,and 5-year recurrence-free rates were 77.0%,29.8% and 19.7%,*** of April 2013,53 of the 71 patients had died from tumor *** overall l-year,3-year,5-year,and 10-year survival rates were 88.7%,76.1%,61.7%,and 30.4%,*** factors that were significantly associated with prognosis in the univariate analysis were age （as a categorical variable）（P =0.006）,modus operandi （P =0.000）,histologic subtype （P =0.000）,tumor grade （P =0.000）,ascites （P =0.000）,postoperative metastasis （P =0.000） and adjuvant therapy （P =0.030）.However,in the multivariate analysis,the modus operandi （P =0.000）,tumor grade （P =0.006）,ascites （P =0.027）,postoperative metastasis （P =0.023） and age （as a categorical variable）（P =0.002） were the only significant predictors of survival.Conclusions：Complete resection remains the most effective method for treating *** grade,old age （≥60 years old）,postoperative metastasis,and ascites predict poor prognoses.

关键词： General Surgery liposarcoma Retroperitoneal Neoplasms Survival Therapeutics

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碳/酚醛防热复合材料烧蚀行为的数值模拟

复合材料学报 2018年第10期35卷 2786-2792页

作者：张拜李旭东兰州理工大学材料科学与工程学院兰州730050

碳/酚醛复合材料被广泛地应用于钝头体表面,是飞行器优秀的热防护材料。为了准确地预测其烧蚀性能,本文从复合材料的组成物纤维和基体的角度出发,基于能量、质量守恒和热分解方程,考虑了烧蚀过程中材料热属性的非线性变化和烧蚀面的退缩... 详细信息

碳/酚醛复合材料被广泛地应用于钝头体表面,是飞行器优秀的热防护材料。为了准确地预测其烧蚀性能,本文从复合材料的组成物纤维和基体的角度出发,基于能量、质量守恒和热分解方程,考虑了烧蚀过程中材料热属性的非线性变化和烧蚀面的退缩,分别计算了纤维和基体的烧蚀性能,预测了烧蚀过程中防热复合材料的温度分布、密度变化、质量损失规律及热属性和线烧蚀率等。结果表明:碳/酚醛复合材料的烧蚀是各种因素相互作用、相互影响的高度非线性过程;烧蚀过程中材料结构具有不均匀的温度分布,烧蚀面区域材料密度衰减最大并且材料的质量损失和损失率几乎呈线性增加;纤维和基体的烧蚀行为存在明显差异,分别预测两者的烧蚀性能,可以为热防护材料的设计提供更加准确的参考和依据。

关键词：碳/酚醛复合材料热防护烧蚀行为数值模拟温度分布

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碳/酚醛复合材料体积烧蚀行为的数值模拟

华中科技大学学报（自然科学版） 2018年第7期46卷 57-62页

作者：张拜李旭东兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室

为了准确掌握碳/酚醛防热复合材料的烧蚀特性和烧蚀机理,基于质量和能量守恒、材料热分解以及物性的计算方程,应用数值模拟方法计算了碳/酚醛复合材料的热响应和体积烧蚀行为.计算结果表明：烧蚀过程中碳/酚醛复合材料具有不均匀的温度... 详细信息

为了准确掌握碳/酚醛防热复合材料的烧蚀特性和烧蚀机理,基于质量和能量守恒、材料热分解以及物性的计算方程,应用数值模拟方法计算了碳/酚醛复合材料的热响应和体积烧蚀行为.计算结果表明：烧蚀过程中碳/酚醛复合材料具有不均匀的温度场分布,在厚度方向上最大温差达到了634 K,并且加热面上基体温度比纤维温度高出了175 K;酚醛基体的平均密度几乎呈线性衰减,40 s时平均密度降低了37.8%;烧蚀过程中酚醛基体具有较大的质量损失,40 s时质量损失了0.31 g,是20 s时的2.4倍.

关键词：碳/酚醛复合材料体积烧蚀数值模拟热防护系统热响应

Adaptability Analysis of IP Routing Protocol in Broadband LEO Constellation Systems

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ZTE Communications 2020年第4期18卷 34-44页

作者： SUN Chenhua YIN Bo li xudong TIAN Xing PANG Ce The 54th Research Institute of China Electronics Technology Group Corporation Shijiazhuang 050081China

With the inclusion of satellite Internet as the information infrastructure in China's "new infrastructure" category,relevant domestic industries and scientific research institutes have successively carried out the design of broadband low earth orbit(LEO) constellation systems and key technical *** the core technology for the satellite-to-ground network communications of a broadband LEO constellation system,routing technology is extremely important for the efficient and reliable transmission of various service *** on the two important broadband LEO constellation systems in China,in-depth analysis and simulation of the high dynamics of the satellite-to-ground satellites are conducted in this paper to obtain more accurate network topology changes and characteristics;then the adaptability of the ground standard IP routing protocol to the broadband LEO constellation system is analyzed,and an LEO constellation simulation scenario is built with the Opnet *** simulation results of the convergence performance of the standard IP routing protocol are *** results show that the IP protocol does not perform well for LEO satellite constellation *** on the studies,some solutions are proposed to take full advantages of the characteristics of LEO satellite *** can also provide a reference for the choice of intersatellite routing architecture and protocol technology for broadband LEO constellation in the future development.

关键词： satellite Internet IP routing protocol high dynamic networking

颗粒增强复合材料微结构的数值模拟与虚拟失效

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机械工程学报 2010年第4期46卷 35-41页

作者：任淮辉李旭东李俊琛兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室兰州730050

利用材料微观组织结构仿真软件ProDesign生成的颗粒增强复合材料微结构样本,包含大量的Voronoi晶粒与椭球颗粒,被用于模拟真实的复合材料微结构,以研究各向异性与局域性对复合材料微结构力学性能的影响。通过对商业有限元软件ABAQUS的... 详细信息

利用材料微观组织结构仿真软件ProDesign生成的颗粒增强复合材料微结构样本,包含大量的Voronoi晶粒与椭球颗粒,被用于模拟真实的复合材料微结构,以研究各向异性与局域性对复合材料微结构力学性能的影响。通过对商业有限元软件ABAQUS的二次开发实现对颗粒增强复合材料微结构细观应力的数值计算。计算机模拟试验证实,增强相颗粒与基体材料的刚度不匹配以及材料微结构组成物取向的局部各向异性,对复合材料结构弱点的分布具有决定性的作用。同时,该计算试验结果对于评估微裂纹的启裂、扩展,预测复合材料微结构材料损伤后的材料性能,推演微结构'虚拟失效行为'亦具有十分重要的意义。

关键词：材料微结构数值模拟材料结构弱点虚拟失效各向异性