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Quantum state tomography for generic pure states

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Science China(Physics,Mechanics & Astronomy) 2018年第11期61卷 1-7页

作者： ShiLin Huang jianxin chen YouNing Li Bei Zeng Institute for Interdisciplinary Information Sciences Tsinghua University Beijing 100084 China Aliyun Quantum Laboratory Hangzhou 310000 China Department of Physics and Collaborative Innovation Center of Quantum Matter Tsinghua University Beijing 100084 China Department of Mathematics & Statistics University of Guelph Guelph NIG2W1 Canada Institute for Quantum Computing University of Waterloo Waterloo N2L3G1 Canada

We examine the problem of whether a multipartite pure quantum state can be uniquely determined by its reduced density *** show that a generic pure state in three party Hilbert space HA■HB■HC, where dim(HA) = 2 and dim(HB) = dim(HC), can be uniquely determined by its reduced states on subsystems HA■HB and HA■HC. Then, we generalize the conclusion to the case that dim(H_1) > 2. As a corollary, we show that a generic N-qudit pure quantum state is uniquely determined by only two of its[(N+1)/2]-particle reduced density matrices. Furthermore,our results indicate a method to uniquely determine a generic N-qudit pure state of dimension D = d^N with only O(D) local measurements, which is an improvement compared to the previous known approach that uses O(D log^2 D) or O(D log D) local measurements.

关键词： state reconstruction quantum tomography foundations of quantum mechanics measurement theory

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矿石浸泡水对绿茶茶汤风味的影响

中国食品学报 2024年第4期24卷 256-265页

作者：刘钰懿徐龙杰汪芳雷晶赵凯曹青青陈建新许勇泉中国农业科学院茶叶研究所杭州310008 深圳安吉尔饮水产业集团有限公司广东深圳518108

泡茶用水的离子种类及含量是影响绿茶茶汤风味品质的关键因素。为了开发泡茶专用水及其相应设备,以不同种类矿石(石英石、麦饭石、富锶滤料、弱碱滤料、高总溶解固体(TDS)滤料)为研究对象,探究矿石浸泡水对绿茶茶汤风味品质的影响。矿... 详细信息

泡茶用水的离子种类及含量是影响绿茶茶汤风味品质的关键因素。为了开发泡茶专用水及其相应设备,以不同种类矿石(石英石、麦饭石、富锶滤料、弱碱滤料、高总溶解固体(TDS)滤料)为研究对象,探究矿石浸泡水对绿茶茶汤风味品质的影响。矿石浸泡水研究结果显示,石水比、浸泡时间、浸泡温度对不同种类矿石浸出规律的影响有显著差异,高TDS滤料浸泡水所含离子含量最高,石英石的溶出稳定性最佳,矿石浸泡水的最佳处理为室温下石水比1∶50,浸泡时间5 min。矿石浸泡水水质分析结果显示,5种矿石浸泡水煮沸后电导率均增大而变化幅度小于10μs/cm,pH值之间存在显著差异(P<0.05),表明矿石浸泡水电导率受温度影响小,而pH受温度影响大。矿石浸泡水所含阳离子(K^(+)、Na^(+)、Mg^(2+)、Al^(3+)、Ca^(2+))中Ca^(2+)是引起矿石浸泡水电导率增大的主要阳离子,随着电导率的增加绿茶茶汤涩味显著增强,其中Ca^(2+)含量与茶汤涩味强度呈极显著相关性(P<0.01)。通过主动添加试验表明,Ca^(2+)可以显著增强绿茶茶汤及儿茶素溶液的涩味强度。综上,Ca^(2+)是影响茶汤涩味的关键离子,通过调节泡茶用水中Ca^(2+)含量可有效调控绿茶茶汤的风味品质。

关键词：绿茶矿石浸泡水风味品质涩味感官评价

Review and Perspective of Tailorable Metal-Organic Framework for Enhancing Microwave Absorption

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Chinese Journal of Chemistry 2023年第9期41卷 1080-1098页

作者： Peng Miao Juan chen jianxin chen Jie Kong Kai-Jie chen School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi'anShaanxi 710072China School of Materials and Chemical Engineering Xi'an Technological UniversityXi'anShaanxi 710021China Research&Development Institute of Northwestern Polytechnical University in Shenzhen ShenzhenGuangdong 518057China

Metal-organic frameworks(MOFs)and their pyrolytic derivates,displaying diverse chemical compositions and microstructures,pro-vide the infinite potential for preparing high-performance microwave absorption materials(MAMs)and have attracted extensive *** this review,we systematically reviewed the recent progress of MOF-based MAMs,including three types of MOF-based MAMs(MOF-derived metal/carbon nanocomposites,MOF-based hybridization materials and conductive MOF).Besides that,the microwave absorption properties and their related physical and chemical appearance were also *** behalf of synergistic effects between microstructures,dielectric components and magnetic response,the MOF-based MAMs show excellent microwave absorption performance,which is superior to that of traditional single metal,metal alloy and pure carbon-based ***-more,the novel conductive MOF with tunable electrical conductivity shows great potential in MAMs due to the fact that it can dra-matically simplify the synthesis process.

关键词： Metal-organic frameworks Crystal structure Interfaces Microwave absorption materials Microstructures

DIAGNOSTIC APPLICATION OF MULTIPHOTON MICROSCOPY IN EPITHELIAL TISSUES

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Journal of Innovative Optical Health Sciences 2011年第2期4卷 159-163页

作者： XINGSHAN JIANG SHUANGMU ZHUO jianxin chen Institute of Laser and Optoelectronics Technology Fujian Provincial Key Laboratory for Photonics Technology Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education Fujian Normal University Fuzhou 350007 China

Epithelial cancer comprises more than 85%of human *** detection and treatment at the early stage has been demonstrated to apparently improve patient *** this review,we summarize our recent research works on the diagnostic application of epithelial tissue based on multiphoton microscopy(MPM),including identification of the layered structures of esophagus,oral cavity,skin and bronchus tissues,establishment of the diagnostic features for distinguishing gastric normal tissue from cancerous tissue,linking collagen alteration and ectocervical epithelial tumor progression for evaluating epithelial tumor progression,and differentiating normal,inflammatory,and dysplastic ectocervical epithelial *** results provide the groundwork for developing MPM into clinical multiphoton endoscopy.

关键词： Epithelial tissue multiphoton microscopy two-photon excitedfluorescence secondharmonic generation

Dielectric Patch Resonator and Antenna

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China Communications 2023年第8期20卷 209-219页

作者： jianxin chen Xueying Wang Shichang Tang Yongle Wu School of Information Science and Technology and Research Center for Intelligent Information TechnologyNantong UniversityNantong 226019China Nantong Research Institute for Advanced Communication Technologies Chongchuan DistrictNantong 226019China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

This paper presents an overview of dielectric patch(DP)antennas developed in recent *** employed DP resonator composed of a DP and a bottom substrate is analyzed comprehensively here,enabling the easy realization of a quasi-planar DP *** combines the dual advantages of the conventional microstrip patch(MP)antenna and dielectric resonator(DR)antenna in terms of profile,gain,bandwidth,radiation efficiency,and design ***,the DP antenna inherits the multi-mode characteristic of the DR antenna,thus it has a large number of high-order modes,including TMmn mode and TEmn *** high-order modes are widely applied,for example,by combining with the dominant TM10 mode to expand the bandwidth,or selecting multiple higher-order modes to implement a high-gain ***,the non-radiation high-order modes are also utilized to produce natural radiation null in filtering antenna *** this paper,the design theories and techniques of DP antenna are introduced and investigated,including calculation and control methods of the resonant mode frequencies,analysis of the radiation mechanism,and applications of the multi-mode *** overview could provide guidance for the subsequent antenna design,thus effectively avoid time-consuming optimization.

关键词： dielectric patch(DP)resonator DP antenna radiation mechanism multi-mode characteristic

Synergetic degradation of Methylene Blue through photocatalysis and Fenton reaction on two-dimensional molybdenite-Fe

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Journal of Environmental Sciences 2022年第1期34卷 11-23页

作者： Chang Liu Bingqiao Yang jianxin chen Feifei Jia Shaoxian Song Hubei Key Laboratory of Mineral Resources Processing and Environment Wuhan University of TechnologyWuhan 430070China Xingfa School of Mining Engineering Wuhan Institute of TechnologyWuhan 430073China School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China

The greatest problem in conventional Fenton reaction is the slow production of ROS(reactive oxygen species)because of the inefficient Fe^(3+)/Fe^(2+) *** on the extraordinary photo-response property of two-dimensional molybdenite(2DM),photogenerated electrons can be easy separated to accelerate the regeneration of Fe^(2+).In this work,Fe^(2+)-anchored 2DM(2DM-Fe)was prepared and used as a heterogeneous Fenton catalyst to investigate the degradation efficiency to Methylene Blue(MB)in the presence of *** to experimental results,2DM-Fe exhibited extraordinary catalytic activity in MB elimination,which ascribed to the synergetic effect of photogenerated carriers and anchored Fe^(2+) to H_(2)O_(2) *** addition,2DM-Fe showed nearly 100%degradation efficiency to MB within 5 cycles with slight leaching amount of Mo and Fe ions,implying the strong stability and reusability in H_(2)O_(2) ***,the influences of H_(2)O_(2) and 2DM-Fe dosages,pH values as well as the degradation efficiency to different dyes were also *** to quenching experiments and EPR(electron paramagnetic resonance)test,the degradation mechanism of MB mainly ascribed to the oxidation of HO•and•O_(2)^(−).This finding provides a novel strategy to design rational Fenton catalyst and has great significance to water remediation in the future.

关键词： Two-dimensional molybdenite Fenton Photocatalysis Methylene Blue

腹腔镜结直肠癌根治术在结直肠癌中的应用价值

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中外医学研究 2024年第1期22卷 128-131页

作者：王强陈建新曹开华武汉市江夏区中医医院湖北武汉430200

目的:探讨腹腔镜结直肠癌根治术在结直肠癌中的应用价值。方法:选取2015年1月—2019年12月武汉市江夏区中医医院收治的100例结直肠癌患者。根据随机数表法将其分为观察组和对照组,各50例。对照组给予开腹结直肠癌根治术,观察组给予腹腔... 详细信息

目的:探讨腹腔镜结直肠癌根治术在结直肠癌中的应用价值。方法:选取2015年1月—2019年12月武汉市江夏区中医医院收治的100例结直肠癌患者。根据随机数表法将其分为观察组和对照组,各50例。对照组给予开腹结直肠癌根治术,观察组给予腹腔镜结直肠癌根治术。比较两组围手术期指标、并发症、生存指标。结果:观察组手术时间、住院时间均短于对照组,术中出血量少于对照组,下床活动时间早于对照组,差异有统计学意义(P0.05)。结论:腹腔镜结直肠癌根治术具有手术时间短、出血量少、康复速度快的优势,相比于开腹手术来说,虽然远期疗效相当,但是腹腔镜手术可以降低术后并发症发生率,缩短患者的住院时间。

关键词：腹腔镜结直肠癌根治术开腹结直肠癌根治术结直肠癌

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PV-VSG光伏电站一次调频试验及性能评估方法研究与应用

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电气工程学报 2024年第2期19卷 259-267页

作者：黄俊梅廖作杰陈建新李鹏涛陕西能源职业技术学院智能制造与信息工程学院咸阳712000 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司西安710072 西北工业大学超常条件材料物理与化学教育部重点实验室西安710072 西安理工大学材料科学与工程学院西安710072

光伏发电的随机性导致了不同光伏电站出现一次调频性能不足、接入电网频率失稳等问题。而光伏场站的一次调频能力是维持电网稳定性的关键,因此对光伏电站的一次调频能力进行测试与评估具有重要意义。以石城子某光伏电站机组为例,详细介... 详细信息

光伏发电的随机性导致了不同光伏电站出现一次调频性能不足、接入电网频率失稳等问题。而光伏场站的一次调频能力是维持电网稳定性的关键,因此对光伏电站的一次调频能力进行测试与评估具有重要意义。以石城子某光伏电站机组为例,详细介绍了PV-VSG光伏电站实施一次调频的意义、原理及措施,并提出了适用于该光伏电站的一次调频试验技术方案和试验方法。通过频率阶跃及模拟实际电网频率扰动、防扰动性能及自动发电控制(Automatic generation control,AGC)协调的合格率对光伏电站的安全性及稳定性进行评估,具有实际应用价值和推广意义。

关键词：光伏发电一次调频试验研究频率阶跃扰动

Digital Light Processing 3D-Printed Ceramic Metamaterials for Electromagnetic Wave Absorption

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Nano-Micro Letters 2022年第7期14卷 279-292页

作者： Rui Zhou Yansong Wang Ziyu Liu Yongqiang Pang jianxin chen Jie Kong MOE Key Lab of Materials Physics and Chemistry in Extraordinary Conditions Shaanxi Key Lab of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Key Laboratory of Optical System Advance Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033People’s Republic of China School of Electronic Science and Engineering Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China

Combining 3D printing with precursor-derived ceramic for fabricating electromagnetic(EM) wave-absorbing metamaterials has attracted great attention. This study presents a novel ultraviolet-curable polysiloxane precursor for digital light processing(DLP) 3D printing to fabricate ceramic parts with complex geometry, no cracks and linear shrinkage. Guiding with the principles of impedance matching, attenuation, and effective-medium theory, we design a crosshelix-array metamaterial model based on the complex permittivity constant of precursor-derived ceramics. The corresponding ceramic metamaterials can be successfully prepared by DLP printing and subsequent pyrolysis process, achieving a low reflection coefficient and a wide effective absorption bandwidth in the X-band even under high temperature. This is a general method that can be extended to other bands, which can be realized by merely adjusting the unit structure of meta-materials. This strategy provides a novel and effective avenue to achieve “target-design-fabricating” ceramic metamaterials, and it exposes the downstream applications of highly efficient and broad EM wave-absorbing materials and structures with great potential applications.

关键词： Electromagnetic wave absorption Metamaterial Precursor-derived ceramics 3D printing