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Nb-based Josephson parametric amplifier for superconducting qubit measurement

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Chinese Physics B 2019年第11期28卷 109-113页

作者： Fei-Fan Su Zi-Ting Wang Hui-Kai Xu Shou-Kuan zhao Hai-Sheng Yan zhao-hua yang Ye Tian Shi-Ping zhao Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences(CAS)Beijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We report a fabrication process and characterization of the Josephson parametric amplifier(JPA) for the single-shot quantum state measurement of superconducting multiqubit system. The device is prepared using Nb film as its base layer,which is convenient in the sample patterning process like e-beam lithography and film etching. Our results show that the JPA has a bandwidth up to 600 MHz with gain above 15 dB and noise temperature approaching the quantum limit. The qubit state differentiation measurements demonstrate the signal-to-noise ratio around 3 and the readout fidelity above 97%and 91% for the ground and first-excited states, respectively.

关键词： superconducting qubit Josephson parametric amplifier device fabrication quantum nondemolition measurement

Efficient spectral single-pixel imaging via Morton frequency-domain scanning [Invited]

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Chinese Optics Letters 2024年第6期22卷 8-14页

作者： Zi-Dong zhao zhao-hua yang Zhi-Hao zhao Ling-An Wu Yuan-Jin Yu School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Automation MIIT Key Laboratory of Complex-field Intelligent SensingBeijing Institute of TechnologyBeijing 100081China yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314019China

Single-pixel imaging (SPI) captures two-dimensional images utilizing a sequence of modulation patterns and measurements recorded by a single-pixel detector. However, the sequential measurement of a scene is time-consuming, especially for high-spatial-resolution imaging. Furthermore, for spectral SPI, the enormous data storage and processing time requirements substantially diminish imaging efficiency. To reduce the required number of patterns, we propose a strategy by optimizing a Hadamard pattern sequence via Morton frequency domain scanning to enhance the quality of a reconstructed spectral cube at low sampling rates. Additionally, we expedite spectral cube reconstruction, eliminating the necessity for a large Hadamard matrix. We demonstrate the effectiveness of our approach through both simulation and experiment,achieving sub-Nyquist sampling of a three-dimensional spectral cube with a spatial resolution of 256×256 pixels and181 spectral bands and a reduction in reconstruction time by four orders of magnitude. Consequently, our method offers an efficient solution for compressed spectral imaging.

关键词： single-pixel imaging spectral imaging optimized Hadamard basis

Investigation of diagnosis and treatment of hemolysis-elevated liver enzymes-low platelet counts （HELLP） syndrome： clinical analysis of 59 cases

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Chinese Medical Journal 2010年第10期123卷 1273-1277页

作者： WANG Yong-qing WANG Jing YE Rong-hua zhao yang-yu Department of Obstetrics and Gynecology Peking University Third Hospital Beijing 100191 China

Background Hemolysis-elevated liver enzymes-low platelet counts （HELLP） syndrome is a clinical condition occurring in middle and late stage pregnancy. It is characterized by hemolysis, elevated liver enzymes and low platelet counts. This study involves the analysis of the diagnosis, clinical characteristics and treatment of 59 cases of HELLP syndrome as well as the clinical classification, method of delivery and gestational age at delivery. Methods Clinical data from 59 cases of HELLP syndrome occurring from January 2000 to December 2009 were analyzed retrospectively. Thirty-five cases were classified as complete HELLP syndrome and 24 cases were considered partial HELLP syndrome. Results Twenty-six of the 59 analyzed patients （44%） with complete HELLP syndrome showed rapid onset, severe signs, symptoms, and complications in addition to a poor clinical outcome. Complications included multiple organ dysfunction syndrome （MODS） occurring in 18 cases, eclampsia （3 cases）, placental abruption （3 cases）, and perinatal death （4 cases）. The remaining 33 cases （24 with partial and 9 with complete HELLP） were characterized by less severe signs, symptoms, complications and progression of the condition. Two of these cases were complicated with MODS （6.1%）, and 1 with perinatal death （3.0%）.Twelve non-radical-type cases received conservative treatment. The remaining 4 patients had recurring HELLP syndrome （6.78%）. Conclusions HELLP syndrome is classified as the radical type and non-radical-type according to clinical characteristics and outcome. Classification of HELLP syndrome cases according to clinical features can help in the monitoring and treatment of the disease. Active termination of pregnancy should be considered for radical-type cases. Non-radical-type cases can undergo conservative treatment with close monitoring in an attempt to improve perinatal outcome without increasing maternal morbidity.

关键词： HELLP syndrome severe preeclampsia diagnosis treatment

Patient with antiphospholipid syndrome accompanied by pre-eclampsia who developed hellp syndrome and eclampsia after abortion

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Chinese Medical Journal 2012年第22期125卷 4142-4144页

作者： WANG Yong-qing NIU Ji-hong WANG Jia-lue YE Rong-hua zhao yang-yu Peking Univ Dept Obstet & Gynecol Hosp 3 Beijing 100191 Peoples R China

Antiphospholipid syndrome （APS） refers to a group of clinical symptoms and signs caused by antiphospholipid antibody （aPLA）. We reported a rare case of poor outcome of a pregnant woman with APS. The pregnant woman had APS, hemolytic anemia, elevated liver function and low platelet count （HELLP） syndrome, and eclampsia and had a poor outcome from a second pregnancy. She was treated with antispasmodics, sedatives, and anti-hypertensive agents, along with anticoagulant therapy and infusion of immunoglobulin. APS during pregnancy often makes pregnancy even more complex and risky. Obstetricians should carry out anticoagulation treatment throughout the perinatal period.

关键词： antiphospholipid syndrome pre-eclampsia, eclampsia

Rapid and scalable preparation of highly quaternized polymer networks to achieve efficient simultaneous adsorption of iodide and pertechnetate

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Science China Chemistry 2025年第1期68卷 337-349页

作者： Meiyun Xu Song Gu Fulong Chen Zhe zhao Peng Liu Daoben hua State Key Laboratory of Radiation Medicine and Protection School of Radiological and Interdisciplinary Sciences (RAD-X) Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions Soochow University

The efficient separation of fission products,such as TcO4-and I-,holds strategic significance for the management of radioactive wastes and environmental *** this study,we propose an ultrafast strategy for scalable preparation of a highly quaternized organic network to facilitate efficient and synchronous separation of iodide and *** network can be prepared within a few minutes at room temperature,using polyethylenimine and 1,2,4,5-tetrakis（bromomethyl）benzene as building *** chlorine replacement,the network,abundantly decorated with quaternary ammonium groups （Cl@QPN）,exhibits an ultrahigh positive charge density of 7.6 mmol/*** enables the rapid and efficient enrichment of target anions through strong electrostatic Coulomb *** a result,Cl@QPN exhibits significantly higher adsorption rate constants of 0.830 g/（mg min） for ReO4-（a nonradioactive surrogate of TcO4-） and 0.677 g/（mg min） for I-compared to other ***,it possesses high adsorption capacities,reaching 1,681 mg/g for ReO4-and 917.4 mg/g for I-.Cl@QPN also demonstrates good selectivity towards target ions and shows efficient adsorption for99TcO4-.Additionally,Cl@QPN exhibits high dynamic processing capacities,handling up to 3,100 and 7,400 kg of simulated streams per kilogram of material for I-and ReO4-,respectively.

关键词： quaternized polymer networks adsorption pertechnetate iodide liquid radioactive streams

Two-Stage Training Method for High-Quality Reconstruction in Single-Pixel Imaging

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Chinese Physics Letters 2024年第12期41卷 71-77页

作者： Hui Shao He huang Yu-Xiao Wei Hui-Juan Zhang zhao-hua yang Yuan-Jin Yu College of Information Science and Engineering Huaqiao UniversityXiamen 361021China School of Automation Beijing Institute of TechnologyBeijing 100081China School of Instrumentation and Optoelectronics Engineering Beihang UniversityBeijing 100191China

A two-stage training method is proposed to enhance imaging quality and reduce reconstruction time in datadriven single-pixel imaging(SPI)under undersampling *** approach leverages a deep learning algorithm to simulate single-pixel detection and image *** the initial training stage,an L2 regularization constraint is imposed on convolution modulation patterns to determine the optimal initial network *** the subsequent stage,a coupled deep learning method integrating coded-aperture design and SPI is adopted,which utilizes backpropagation of the loss function to iteratively optimize both the binarized modulation patterns and imaging network *** reducing the binarization errors introduced by the dithering algorithm,this approach improves the quality of data-driven *** with traditional deep-learning SPI methods,the proposed method significantly reduces computational complexity,resulting in accelerated image *** and simulation results demonstrate the advantages of the method,including high imaging quality,short image reconstruction time,and simplified *** an image size of 64×64 pixels and 10%sampling rate,the proposed method achieves a peak signal-to-noise ratio of 23.22 dB,structural similarity index of 0.76,and image reconstruction time of approximately 2.57×10^(−4) seconds.

关键词： image network utilize

低功率YAG激光-MAG电弧复合焊接的研究

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激光杂志 2009年第3期30卷 57-59页

作者：赵华洋内蒙古民族大学机械工程学院内蒙古通辽028043

本文以低功率YAG激光-MAG电弧复合热源和单脉冲MAG焊接不锈钢为基础,对低功率激光复合焊接中的一些特点进行了初步研究。试验结果表明,焊接速度是复合焊接过程中的一个重要参数,焊接熔深主要由激光的能量决定;低功率复合热源和单MAG焊... 详细信息

本文以低功率YAG激光-MAG电弧复合热源和单脉冲MAG焊接不锈钢为基础,对低功率激光复合焊接中的一些特点进行了初步研究。试验结果表明,焊接速度是复合焊接过程中的一个重要参数,焊接熔深主要由激光的能量决定;低功率复合热源和单MAG焊缝组织都是由奥氏体和枝状的δ-铁素体组成,但在同样的焊接熔深下复合焊接组织晶粒比单MAG焊缝中的晶粒细小;发现复合焊接中由于YAG激光的加入,在激光作用点上方粒子的热运动和电离程度比单MAG焊接强烈;复合焊接电弧等离子体的电子温度和电子密度大于单MAG焊接电弧等离子体的电子温度和电子密度。

关键词： YAG激光-电弧复合焊接组织发射光谱电子温度与密度

A self-adaptive inorganic in-situ separator by particle crosslinking for nonflammable lithium-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 469-480页

作者： Jiarui yang Jiuzhou Liu Wenrui Cai Ziyu zhao Shan Wang Lu He Shanshan Lv Zhiwei Zhu Zhongfeng Ji Guojiang Wen hua Li Yuanming Zhai Xuewei Fu Wei yang Yu Wang College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University

All-safe liquid-state lithium-ion batteries(ASLS-LIBs) is of great interest as they can potentially combine the safety of all-solid-state batteries with the high performance and low manufacturing cost of traditional liquid-state LIBs. However, the practical success of ASLS-LIBs is bottlenecked by the lack of advanced separator technology that can simultaneously realize high performances in puncturing-tolerability,fire-resistance, and importantly, wetting-capability with non-flammable liquid-electrolytes. Here, we propose a concept of inorganic in-situ separator(IISS) by hybrid-sol physical crosslinking directly onto the electrode surface to address the above challenges. Particularly, the hybrid-sol is designed with silica nanoparticles as the building block and poly(vinylidene difluoride) nanoparticles as the crosslinking agent. The critical factors for controlling the IISS microstructures and properties have been systematically investigated. The advantages of the IISS have been confirmed by its fast wetting with various fireresistant liquid-electrolytes, customizable thickness and porous structures, robust interface with planar or three-dimensional(3D)-structured electrodes, and importantly, unexpected self-adaptability against puncturing. Enabled by the above merits, a fire-resistant ASLS-LIB is successfully assembled and demonstrated with stable electrochemical performance. This sol-crosslinked IISS may open an avenue for the studies on the next-generation separator technology, cell assembling, solid electrolyte processing as well as non-flammable secondary batteries.

关键词： Silica nanoparticles

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路基下伏矩形溶洞的稳定性解析法

中国公路学报 2018年第2期31卷 165-170,180页

作者：赵衡肖尧赵明华杨超炜湖南大学岩土工程研究所湖南长沙410082

为评价荷载作用下的路基下伏矩形溶洞的稳定性,首先根据岩溶区路基承载特性建立简化的力学分析模型,并进一步得到等效计算模型。其次,基于复变函数理论,提出矩形溶洞任意截面映射函数的确定方法,并给出常用矩形截面映射函数的具体表达... 详细信息

为评价荷载作用下的路基下伏矩形溶洞的稳定性,首先根据岩溶区路基承载特性建立简化的力学分析模型,并进一步得到等效计算模型。其次,基于复变函数理论,提出矩形溶洞任意截面映射函数的确定方法,并给出常用矩形截面映射函数的具体表达式。然后,求得矩形溶洞在自重与路基荷载联合作用下的地层应力;在此基础上,进一步求得任意截面的最大、最小主应力,同时引入Griffith强度准则,对溶洞的稳定性进行评价。最后,通过数值方法及工程实例对本文计算方法进行验算。研究结果表明:该方法所得水平应力和切应力与数值结果误差在5%以内,竖直应力误差在8%以内,工程实际情况与理论计算结果吻合良好,对岩溶区路基设计计算有一定的参考价值;值得注意的是,矩形溶洞4个顶点处的水平应力及竖向应力值都比较大,应力变化幅度较为明显,存在严重的应力集中现象,说明矩形溶洞的4个顶点比较容易破坏,在工程实践中应特别注意该处的验算。

关键词：道路工程矩形溶洞复变函数稳定性岩溶区路基