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A flat-based plasmonic fiber probe for nanoimaging

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Nano Research 2023年第5期16卷 7545-7549页

作者： Fei Wang Shaobo Li Shuhao Zhao Ze Zhang Peirui Ji chengsheng xia Biyao Cheng Guofeng Zhang Shuming Yang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong UniversityXi’an 710049China

The difficulty of obtaining high-intensity localized light spots for optical probes leads to their lack of good applications in *** we demonstrate a Fabry–Pérot resonance flat-based plasmonic fiber probe(FPFP).The simulation results show that the probe can obtain a nanofocusing spot at the tip with the radially polarized *** Fabry–Pérot interference structure is used to control the plasmon propagation on the surface of the probe,it effectively improves the local spot intensity at the ***,the experimental results verify that the FPFP(tip curvature radius is 20 nm)prepared by chemical etching method can obtain a nanofocusing spot at the *** nanoimaging of the gold slit structure demonstrates the nanoimaging capability of the FPFP,the 36.9 nm slit width is clearly identified by the FPFP.

关键词： optical probe nanoimaging controlling plasmon propagation nanofocusing local electric field enhancement

Polarization-insensitive plasmon nanofocusing with broadband interference modulation for optical nanoimaging

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Nano Research 2023年第7期16卷 9990-9996页

作者： Shaobo Li Fei Wang Ze Zhang Shuhao Zhao chengsheng xia Peirui Ji xiaomin Wang Guofeng Zhang Tao Liu Feng Chen Shuming Yang State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China School of Electronic Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China

Delivering light to the nanoscale using a flexible and easily integrated fiber platform holds potential in various fields of quantum science and ***,rigorous optical alignment,sophisticated fabrication process,and low spatial resolution of the fiber-based nanoconcentrators limit the practical ***,a broadband azimuthal plasmon interference nanofocusing technique on a fiber-coupled spiral tip is demonstrated for fiber-based near-field optical *** spiral plasmonic fiber tip fabricated through a robust and reproducible process can reverse the polarization and modulate the mode field of the surface plasmon polaritons in three-dimensionally azimuthal direction,resulting in polarization-insensitive,broad-bandwidth,and azimuthal interference *** integrating this with a basic scanning near-field optical microscopy,a high optical resolution of 31 nm and beyond is *** high performance and the easy incorporation with various existing measurement platforms offered by this fiber-based nanofocusing technique have great potential in near-field optics,tip-enhanced Raman spectroscopy,nonlinear spectroscopy,and quantum sensing.

关键词： azimuthal asymmetries plasmonic nanoconcentrator fiber-based plasmonic tip near-field scanning optical microscopy

咪唑安定与芬太尼复合罗哌卡因用于颈丛阻滞麻醉后对患者应激反应的影响

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国际医药卫生导报 2016年第12期22卷 1738-1741页

作者：夏承生山东省东平县中医院麻醉科 271500

目的探究与分析咪唑安定与芬太尼复合罗哌卡因用于颈丛阻滞麻醉后对患者应激反应的影响。方法选取本院2012年8月至2015年8月收治的90例接受颈丛阻滞麻醉的颈部手术患者，采取随机数字表法分为咪唑安定组、芬太尼组及对照组，各30例。咪... 详细信息

目的探究与分析咪唑安定与芬太尼复合罗哌卡因用于颈丛阻滞麻醉后对患者应激反应的影响。方法选取本院2012年8月至2015年8月收治的90例接受颈丛阻滞麻醉的颈部手术患者，采取随机数字表法分为咪唑安定组、芬太尼组及对照组，各30例。咪唑安定组给予罗哌卡因复合咪唑安定，芬太尼组给予芬太尼复合罗哌卡因，对照组仅给予罗哌卡因，对比三组麻醉阻滞前、麻醉阻滞后5、20、40min收缩压（SBP）、舒张压（DBP）、心率（HR）及血氧饱和度（SP02）。结果对照组阻滞后5minSBP及DBP与阻滞前相比明显升高，差异具有统计学意义（t=3．42，5．56，P〈0．05）。咪唑安定组及芬太尼组阻滞后20min、阻滞后40minSBP及DBP与阻滞前相比均明显升高，但不如对照组升高显著，且芬太尼组与咪唑安定组相比SBP及DBP升高更加显著，差异具有统计学意义（t=4．23—6．19，P〈0．05）。咪唑安定组及芬太尼组阻滞后20min、阻滞后40minHR与阻滞前相比升高，但不如对照组升高显著，差异具有统计学意义（t=5．10—6．23，P〈0．05）。结论采用咪唑安定或芬太尼复合罗哌卡因应用于颈丛阻滞麻醉后均可在一定程度上预防颈丛阻滞后血压升高、心率增快等应激反应，但咪唑安定复合罗哌卡因的效果更好。安全性较高。

关键词：咪唑安定芬太尼罗哌卡因颈丛阻滞麻醉应激反应

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A Lightweight Convolutional Neural Network with Representation Self-challenge for Fingerprint Liveness Detection

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Computers, Materials & Continua 2022年第10期73卷 719-733页

作者： Jie Chen chengsheng Yuan Chen Cui Zhihua xia Xingming Sun Thangarajah Akilan School of Computer Science Nanjing University of Information Science and TechnologyNanjing210044China Key Laboratory of Public Security Information Application Based on Big-Data Architecture Ministry of Public SecurityZhejiang Police CollegeHangzhou310053China Jiangsu Yuchi Blockchain Research Institute Nanjing210044China Department of Software Engineering Lakehead UniversityThunder BayON P7B 5E1Canada

Fingerprint identification systems have been widely deployed in many occasions of our daily ***,together with many advantages,they are still vulnerable to the presentation attack(PA)by some counterfeit *** address challenges from PA,fingerprint liveness detection(FLD)technology has been proposed and gradually attracted people’s *** vast majority of the FLD methods directly employ convolutional neural network(CNN),and rarely pay attention to the problem of overparameterization and over-fitting of models,resulting in large calculation force of model deployment and poor model *** at filling this gap,this paper designs a lightweight multi-scale convolutional neural network method,and further proposes a novel hybrid spatial pyramid pooling block to extract abundant features,so that the number of model parameters is greatly reduced,and support multi-scale true/fake fingerprint ***,the representation self-challenge(RSC)method is used to train the model,and the attention mechanism is also adopted for optimization during execution,which alleviates the problem of model over-fitting and enhances generalization of detection ***,experimental results on two publicly benchmarks:LivDet2011 and LivDet2013 sets,show that our method achieves outstanding detection results for blind materials and *** size of the model parameters is only 548 KB,and the average detection error of cross-sensors and cross-materials are 15.22 and 1 respectively,reaching the highest level currently available.

关键词： FLD lightweight multi-scale RSC blind materials

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芯片表面形貌检测方法及系统研制

计测技术 2023年第1期43卷 137-142页

作者：夏承晟邓惠文赵书浩陶伟灏张国锋杨树明西安交通大学机械制造系统工程国家重点实验室陕西西安710049

传统检测方法由于测量范围小、测量时间长,不能满足在线、在机和大幅面的检测需求,本文提出了一种白光扫描干涉和原子力显微测量相结合的芯片表面形貌测量方法。在分析了白光扫描干涉测量技术和原子力显微测量技术特点的基础上,构建了... 详细信息

传统检测方法由于测量范围小、测量时间长,不能满足在线、在机和大幅面的检测需求,本文提出了一种白光扫描干涉和原子力显微测量相结合的芯片表面形貌测量方法。在分析了白光扫描干涉测量技术和原子力显微测量技术特点的基础上,构建了两种方法互补的测量方案:首先采用白光扫描干涉测量技术对芯片进行大范围快速扫描,再通过原子力显微测量技术对关键区域进行精细扫描检测。基于此进行了测量系统的硬件设计与集成,测试结果表明,该系统能够在毫米级检测范围内实现纳米级表面形貌的精确测量。

关键词：芯片表面形貌测量白光干涉原子力显微镜

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OPPR:An Outsourcing Privacy-Preserving JPEG Image Retrieval Scheme with Local Histograms in Cloud Environment

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Journal on Big Data 2021年第1期3卷 21-33页

作者： Jian Tang Zhihua xia Lan Wang chengsheng Yuan Xueli Zhao Nanjing University of Information Science&Technology Nanjing210044China

As the wide application of imaging technology,the number of big image data which may containing private information is growing *** to insufficient computing power and storage space for local server device,many people hand over these images to cloud servers for *** actually,it is unsafe to store the images to the cloud,so encryption becomes a necessary step before uploading to reduce the risk of privacy ***,it is not conducive to the efficient application of image,especially in the Content-Based Image Retrieval(CBIR)*** paper proposes an outsourcing privacy-preserving JPEG CBIR *** design a set of JPEG format-compatible encryption method,making no file expansion to JPEG *** firstly combine multiple adjacent 8×8 DCT coefficient blocks into ***,random scrambling and stream encryption are used on the binary code of DCT coefficients to protect the JPEG image *** task of extracting features from encrypted images and retrieving similar images are done by the cloud *** group index histograms of DCT coefficients are extracted from the encrypted big-blocks,then the global vector is produced to represent the JPEG image with the aid of bag-of-words(BOW)*** security analysis and experimental results show that our proposed scheme has strong security and good retrieval performance.

关键词： JPEG image retrieval DCT coefficients BOW format-compatible

Formation mechanism and stability of low environment-sensitive ternary nanoparticles based on zein-pea protein-pectin for astaxanthin delivery

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Food Bioscience 2023年第2期52卷 549-557页

作者： Tianyu Shi chengsheng Jia Xinshuo Wang Shuqin xia Xingwei Wang Chunli Fan xiaoming Zhang Caleb John Swing State Key Laboratory of Food Science and Technology Jiangnan University1800 Lihu RoadWuxiJiangsu214122People’s Republic of China School of Food Science and Technology Collaborative Innovation Center of Food Safety and Quality ControlJiangnan University1800 Lihu RoadWuxiJiangsu214122People’s Republic of China Department of Animal Sciences Colorado State University350 W.Pitkin St.Fort CollinsCO80523-1171USA

This study was devoted for preparing zein-pea protein-pectin ternary nanoparticles through an alcohol-free pH-shifting method for the delivery of astaxanthin(Ax).The complexation of zein and pea protein(PP)in the weight ratio range of 1:2.5 to 1.2:1 maintained the dispersity at pH 7.0 with the average particle size of 90.47-132.38 nm and the polydispersity index of *** circular dichroism,fluorescence,Fourier transform infrared spectroscopy and other analyses indicated that the zein interacted with PP to form a composite structure through the folding action of protein structure in the process of pH reduction driven by hydrophobic and electrostatic *** incorporation of pectin(pec)further enhanced the physicochemical stability of the *** optimal weight ratio of zein/PP/pec was 2:4:3,and the encapsulation efficiency of astaxanthin reached 94.22%.The X-ray diffraction results showed that the astaxanthin was amorphous after *** with Ax/zein-PP,the Ax/zein-PP-pec showed better colloidal stability under the conditions of wide pH range(4.0-8.0),high temperature(90℃),long time ultraviolet light treatment,and 15-day *** results indicated that the construction of the zein-PP-pec nanoparticles could be used as a low environment-sensitive nanocarrier for the loading,protection,and delivery of hydrophobic functional substances such as astaxanthin.

关键词： Zein Pea protein Pectin Astaxanthin Interaction force Low environment-sensitive

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抗氧化型壁材包埋番茄红素微胶囊的研究

食品与生物技术学报 2018年第1期37卷 50-57页

作者：林蔚婷贾承胜夏书芹张晓鸣冯骉江南大学食品学院江苏无锡214122

研究了新型抗氧化性壁材制备番茄红素微胶囊的生产工艺。采用番茄红素为芯材,乳清分离蛋白与低聚木糖的美拉德反应产物(MRPs)为壁材,通过均质和喷雾干燥制得番茄红素微胶囊。优化的工艺参数为乳清分离蛋白与低聚木糖的质量比1∶2,加热时... 详细信息

研究了新型抗氧化性壁材制备番茄红素微胶囊的生产工艺。采用番茄红素为芯材,乳清分离蛋白与低聚木糖的美拉德反应产物(MRPs)为壁材,通过均质和喷雾干燥制得番茄红素微胶囊。优化的工艺参数为乳清分离蛋白与低聚木糖的质量比1∶2,加热时间3 h,p H 10,均质压力40 MPa。在此条件下得到的微胶囊产率和包埋效率分别为86.28%和94.11%。通过保留率的数据分析,结果表明壁材能够有效保护芯材成分,提高番茄红素微胶囊的储存稳定性。

关键词：番茄红素微胶囊化乳清分离蛋白低聚木糖

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没食子酸植物甾醇酯合成工艺的研究

中国油脂 2016年第2期41卷 65-69页

作者：霍振宇任明星贾承胜夏书芹张晓鸣冯骉江南大学食品学院食品科学与技术国家重点实验室江苏无锡214122

研究了酶法催化合成没食子酸植物甾醇酯的最佳工艺条件。采用单因素实验考察了溶剂类型、脂肪酶添加量、反应温度、分子筛、反应时间、酸醇摩尔比、底物浓度对酯化率的影响,并利用高效液相色谱、红外光谱对产物进行了鉴定。结果表明:当... 详细信息

研究了酶法催化合成没食子酸植物甾醇酯的最佳工艺条件。采用单因素实验考察了溶剂类型、脂肪酶添加量、反应温度、分子筛、反应时间、酸醇摩尔比、底物浓度对酯化率的影响,并利用高效液相色谱、红外光谱对产物进行了鉴定。结果表明:当使用正己烷作溶剂、Lipozyme 435脂肪酶添加量25 g/L、除水剂3分子筛添加量90 g/L、没食子酸与植物甾醇摩尔比1∶2.5、底物浓度150mmol/L、55℃水浴振荡反应72 h时,酯化率最高,可达79.7%;液相色谱分析结果可知没食子酸植物甾醇酯纯度大于95%。

关键词：植物甾醇没食子酸脂肪酶酯化

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