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Four-dimensional direct detection receiver enabling Jones-space field recovery with phase and polarization diversity

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Photonics Research 2024年第3期12卷 399-410页

作者： QI WU yixiao zhu XUEYANG LI HEXUN JIANG CHEN CHENG MENGFAN FU YIKUN ZHANG QUNBI zhuGE ZHAOHUI LI WEISHENG HU Peng Cheng Laboratory Shenzhen 518055China State Key Laboratory of Advanced Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Electronics and Information Technology and Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen UniversityGuangzhou 510006China

Data centers,the engines of the global Internet,rely on powerful high-speed optical *** optical fiber communication,classic direct detection captures only the intensity of the optical field,while the coherent detection counterpart utilizes both phase and polarization diversities at the expense of requiring a narrow-linewidth and high-stability local oscillator(LO).Herein,we propose and demonstrate a four-dimensional Jones-space optical field recovery(4-D JSFR)scheme without an *** polarization-diverse full-field receiver structure captures information encoded in the intensity and phase of both polarizations,which can be subsequently extracted *** our knowledge,our proposed receiver achieves the highest electrical spectral efficiency among existing direct detection systems and potentially provides similar electrical spectral efficiency as standard intradyne coherent detection *** fully recovered optical field extends the transmission distance beyond the limitations imposed by fiber chromatic ***,the LO-free advantage makes 4-D JSFR suitable for photonic integration,offering a spectrally efficient and cost-effective solution for massively parallel data center *** results may contribute to the ongoing developments in the theory of optical field recovery and the potential design considerations for future high-speed optical transceivers.

关键词： polarization receiver phase

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Antimicrobial resistance characteristics and phylogenetic relationships of pleuromutilin-resistant Enterococcus isolates from different environmental samples along a laying hen production chain

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Journal of Environmental Sciences 2024年第3期137卷 195-205页

作者： Cong Lin Yuxuan Feng Xianjun Xie Haoyu Zhang Jie Wu yixiao zhu Jing Yu Jingyi Feng Wen Su Shanming Lai Anyun Zhang Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province Key Laboratory of Bio-Resource and Eco-Environment of Ministry of EducationCollege of Life SciencesSichuan UniversityChengdu 610065China

Antimicrobial resistance in the laying hen production industry has become a serious public health *** antimicrobial resistance and phylogenetic relationships of the common conditional pathogen Enterococcus along the laying hen production chain have not been systematically clarified.105 Enterococcus isolates were obtained from 115 environmental samples (air,dust,feces,fies,sewage,and soil) collected along the laying hen production chain (breeding chicken,chick,young chicken,and commercial laying hen).These Enterococcus isolates exhibited resistance to some clinically relevant antibiotics,such as tetracycline (92.4%),streptomycin (92.4%),and erythromycin (91.4%),and all strains had multidrug resistance *** genome sequencing characterized 29 acquired antibiotic resistance genes (ARGs) that conferred resistance to 11 classes of antibiotics in 51pleuromutilin-resistant Enterococcus isolates,and lsa(E),which mediates resistance to pleuromutilins,always co-occurred with lnu(B).Alignments with the Mobile Genetic Elements database identified four transposons (Tn554,Tn558,Tn6261,and Tn6674) with several ARGs(erm(A),ant(9)-la,fex(A),and optrA) that mediated resistance to many clinically important ***,we identified two new transposons that carried ARGs in the Tn554 family designated as Tn7508 and Tn7492.A complementary approach based on conventional multi-locus sequence typing and whole genome single nucleotide polymorphism analysis showed that phylogenetically related pleuromutilin-resistant Enterococcus isolates were widely distributed in various environments on different production *** results indicate that environmental contamination by antimicrobial-resistant Enterococcus requires greater attention,and they highlight the risk of pleuromutilin-resistant Enterococcus and ARGs disseminating along the laying hen production chain,thereby warranting effective disinfection.

关键词： Antimicrobial resistance Enterococcus Laying hen production chain Pleuromutilin

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Effect of dilution holes on the performance of a triple swirler combustor

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Chinese Journal of Aeronautics 2014年第6期27卷 1421-1429页

作者： Ding Guoyu He Xiaomin Zhao Ziqiang An Bokun Song Yaoyu zhu yixiao Jiangsu Province Key Laboratory of Aerospace Power Systems College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Co-Innovation Center for Advanced Aero-Engine AVIC Harbin Dongan Engine (Group) Corporation Ltd.

A triple swirler combustor is considered to be a promising solution for future high temperature rise combustors. The present paper aims to study dilution holes including primary dilution holes and secondary dilution holes on the performance of a triple swirler combustor. Experimental investigations are conducted at different inlet airflow velocities（40–70 m/s） and combustor overall fuel–air ratio with fixed inlet airflow temperature（473 K） and atmospheric pressure. The experimental results show that the ignition is very difficult with specific performance of high ignition fuel–air ratio when the primary dilution holes are located 0.6H（where H is the liner dome height）downstream the dome, while the other four cases have almost the same ignition performance. The position of primary dilution holes has an effect on lean blowout stability and has a large influence on combustion efficiency. The combustion efficiency is the highest when the primary dilution holes are placed 0.9H downstream the dome among the five different *** the secondary dilution holes, the pattern factor of Design A is better than that of Design B.

关键词： Combustor performance Fuel–air ratio Primary dilution holes Secondary dilution holes Triple swirler combustor

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卫星并联贮箱均衡排放的研究

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机械制造与自动化 2024年第1期53卷 161-163,190页

作者：朱一骁王申张乾鹏夏勇上海空间推进研究所上海201112 上海空间发动机工程技术研究中心上海201112 上海卫星工程研究所上海201109

在双组元卫星推进系统设计过程中,为保证发动机入口混合比满足设计状态,需要通过调节燃料和氧化剂支路的管路流阻来实现,常规方法为通过多次地面水试试验,对各支路安装的节流孔板进行修正。根据某型号卫星的管路布局,基于AMESim建立并... 详细信息

在双组元卫星推进系统设计过程中,为保证发动机入口混合比满足设计状态,需要通过调节燃料和氧化剂支路的管路流阻来实现,常规方法为通过多次地面水试试验,对各支路安装的节流孔板进行修正。根据某型号卫星的管路布局,基于AMESim建立并联贮箱均衡排放的预测模型并在后续的地面水试试验中进行验证。试验验证了仿真模型的可行性,提出了仿真模型的修正参数,修正后的仿真模型可以较为准确地预测该型号后续卫星的孔板尺寸,节约了地面水试试验的时间,可为缩短卫星型号研制周期提供帮助。

关键词：卫星均衡排放并联贮箱 AMESim 仿真

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A 70 Gbps NRZ optical link based on 850 nm band-limited VCSEL for data-center intra-connects

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Science China(Information Sciences) 2018年第8期61卷 83-89页

作者： Zhongwei TAN Chuanchuan YANG yixiao zhu Zhaopeng XU Kaiheng ZOU Fan ZHANG Ziyu WANG State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

Short-reach optical interconnects among servers in data centers have attracted extensive studies recently. High capacity and low cost are two key problems for optical link. In this paper, we demonstrate a band-limited 850 nm vertical cavity surface emitting laser(VCSEL) based optical transmission system. The optical link realizes 70 Gb/s(65 Gb/s net rate) non-return-to-zero(NRZ) signal transmission over 11 m and20 m OM4 multimode fiber(MMF), with the help of equalization for time domain interference *** utilized VCSEL has a bandwidth of only 18 GHz, meeting the principle of low cost. The data baud rate in this paper reaches the highest value for an 18-GHz-class 850 nm VCSEL based optical link, to our best knowledge.

关键词： 850 nm VCSEL band-limited 70 Gb/s NRZ OM4 MMF equalization

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Spectrally sliced heterodyne coherent receiver with halved electrical bandwidth

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Chinese Optics Letters 2022年第9期20卷 8-13页

作者： Qi Wu yixiao zhu Ziyu Cheng Longjie Yin Weisheng Hu State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

A spectrally sliced heterodyne coherent receiver(SHCR)employing four balanced photodetectors and analog-to-digital converters with half of the signal bandwidth is proposed to complete the signal reception and field *** first numerically characterize the performance of SHCR compared with an intradyne coherent receiver and then validate the principle of the SHCR in a proof-of-concept single-polarization experiment.A 60 GBaud 16-quadrature amplitude modulation transmission is experimentally demonstrated over 80 km standard single-mode fiber with a bit-error-rate of 8.5×10^(-4) below the 7%hard-decision forward error correction threshold of 3.8×10^(-3).The SHCR offers a low-cost,hybrid-free,and channel-skew-tolerant candidate for data center interconnects.

关键词： sliced heterodyne coherent receiver heterodyning spectral slicing electrical bandwidth.

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A Combined Antenna Array Deployment with High Positioning Accuracy and Low Angular Measurement Error

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Journal of Beijing Institute of Technology 2024年第2期33卷 141-154页

作者： Wangjie Chen Weiqiang zhu Zhenhong Fan Li Wu Yi He yixiao Wang School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China Nanjing Electronis Equipment Institute Nanjing 210000China

In this paper,an antenna array composed of circular array and orthogonal linear array is proposed by using the design of long and short baseline“orthogonal linear array”and the circular array ambiguity resolution design of multi-group baseline *** effectiveness of the antenna array in this paper is verified by sufficient simulation and *** the system deviation correction work,it is found that in the L/S/C/X frequency bands,the ambiguity resolution probability is high,and the phase difference system error between each channel is basically the *** angle measurement error is less than 0.5°,and the positioning error is less than 2.5 ***,as the center frequency increases,calibration consistency improves,and the calibration frequency points become applicable over a wider frequency *** a center frequency of 11.5 GHz,the calibration frequency point bandwidth extends to 1200 *** combined antenna array deployment holds significant promise for a wide range of applications in contemporary wireless communication systems.

关键词： antenna array deployment ambiguity resolution phase consistency angle measurement error positioning error

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Incremental learning-based land mark recognition for mirco-UAV autonomous landing

Incremental learning-based land mark recognition for mirco-U...

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第三十九届中国控制会议

作者： Kai Shen Yu zhuang yixiao zhu Beijing Institute of Technology

In order to expand the application fields of micro-UAVs, the ability of land mark recognition and autonomous landing is one of the key technologies for UAVs flighting in complex environment. For achieving more robust and precise relative pose estimation, we propose to apply an ellipse feature-based pose estimation method instead of QR code features. Considering the poor calculating ability on-board, the land mark recognition algorithms based on deep learning are difficult to be used in microUAVs. Hence, we put forward a new strategy for target recognition by taking advantage of incremental learning. Concretely, we select to use broad learning system（BLS） to replace the classification layer of MobileNetV3, and design a new target recognition network that may be named as MobileNetV3-BLS. To verify the effectiveness of proposed MobileNetV3-BLS, we use PASCAL VOC2007 and data set collected in our university, and carry out a series of comparative experiments on Nvidia TX2. Results of experiments show that MobileNetV3-BLS can progressively increase the accuracy of landmark recognition online. In addition,the proposed MobileNetV3-BLS does meet the need of deployment on Nvidia TX2 and the real-time requirement of on-board calculation in mirco-UAV avionics systems.

关键词： Incremental learning Broad learning system Landmark recognition MobileNetV3 Mirco-UAVs

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九女墩铜盘铭文校释

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故宫博物院院刊 2022年第4期240卷 59-66,140页

作者：朱译潇南京大学历史学院

本文对近来刊布的江苏邳州九女墩铜盘铭文进行校理,订正了部分误释字;同时,结合文献记载、上古音通假的音理以及器形的比较,认为铭文新见的器物自名“锗”,当读为金文常见的盂。此外,作者根据金文人名系联该器及其他徐国王室铜器,复原... 详细信息

本文对近来刊布的江苏邳州九女墩铜盘铭文进行校理,订正了部分误释字;同时,结合文献记载、上古音通假的音理以及器形的比较,认为铭文新见的器物自名“锗”,当读为金文常见的盂。此外,作者根据金文人名系联该器及其他徐国王室铜器,复原了一段徐王“斯于”的家世谱系。

关键词：徐国青铜器九女墩徐王自名吴越人名

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基于KP-ABE算法的云存储可验证安全删除方案

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计算机应用与软件 2021年第7期38卷 332-338页

作者：朱怡晓赵奎四川大学网络空间安全学院四川成都610065

通过云存储将数据外包至远程服务器能够减轻本地负担,但由于云服务器不完全可信,当存储在云端的数据需要被删除时,缺乏有效的确定性删除机制可能导致隐私泄露等安全问题。为实现确定性删除,提出基于密钥策略属性加密算法(Key Policy Att... 详细信息

通过云存储将数据外包至远程服务器能够减轻本地负担,但由于云服务器不完全可信,当存储在云端的数据需要被删除时,缺乏有效的确定性删除机制可能导致隐私泄露等安全问题。为实现确定性删除,提出基于密钥策略属性加密算法(Key Policy Attribute-based Encryption,KP-ABE)的云存储可验证安全删除方案。该方案将外包数据与属性关联产生密文,以布尔电路构造访问结构生成私钥;通过撤销访问数据必需的属性使得被删除数据不可恢复,利用多分支路径树实现删除的可验证性。安全性分析证明了该方案在选择明文攻击下的安全性。进一步实验表明,该方案能够有效实现云数据细粒度访问控制和可验证删除,证实了其实用性。

关键词：云存储属性基加密访问控制可验证删除

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