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Ultrasensitive terahertz metamaterial sensor based on vertical split ring resonators

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Photonics Research 2017年第6期5卷 90-96页

作者： WEI WANG FENGPING YAN siyu tan HONG ZHOU YAFEI HOU Key Laboratory of All Optical Network & Advanced Telecommunication of EMC Institute of Lightwave TechnologyBeijing Jiaotong University Department of Electronics Information and Communication Engineering Osaka Institute of Technology Graduate School of Natural Science and Technology Okayama University

An ultrasensitive metamaterial sensor based on double-slot vertical split ring resonators(DVSRRs) is designed and numerically calculated in the terahertz frequency. This DVSRR design produces a fundament LC resonance with a quality factor of about 20 when the incidence magnetic field component normal to the DVSRR array. The resonant characteristics and sensing performance of the DVSRR array design are systematically analyzed employing a contrast method among three similar vertical split ring resonator(SRRs) structures. The research results show that the elimination of bianisotropy, induced by the structural symmetry of the DVSRR design, helps to achieve LC resonance of a high quality factor. Lifting the SRRs up from the substrate sharply reduces the dielectric loss introduced by the substrate. All these factors jointly result in superior sensitivity of the DVSRR to the attributes of analytes. The maximum refractive index sensitivity is 788 GHz/RIU or 1.04 × 10~5 nm∕***, the DVSRR sensor maintains its superior sensing performance for fabrication tolerance ranging from -4% to 4% and wide range incidence angles up to 50° under both TE and TM illuminations.

关键词： RIU Ultrasensitive terahertz metamaterial sensor based on vertical split ring resonators

Asymmetric Loss Based on Image Properties for Deep Learning-Based Image Restoration

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Computers, Materials & Continua 2023年第12期77卷 3367-3386页

作者： Linlin Zhu Yu Han Xiaoqi Xi Zhicun Zhang Mengnan Liu Lei Li siyu tan Bin Yan Henan Key Laboratory of Imaging and Intelligent Processing PLA Strategic Support Force Information Engineering UniversityZhengzhou450000China

Deep learning techniques have significantly improved image restoration tasks in recent *** a crucial compo-nent of deep learning,the loss function plays a key role in network optimization and performance ***,the currently prevalent loss functions assign equal weight to each pixel point during loss calculation,which hampers the ability to reflect the roles of different pixel points and fails to exploit the image’s characteristics *** address this issue,this study proposes an asymmetric loss function based on the image and data characteristics of the image recovery *** novel loss function can adjust the weight of the reconstruction loss based on the grey value of different pixel points,thereby effectively optimizing the network training by differentially utilizing the grey information from the original ***,we calculate a weight factor for each pixel point based on its grey value and combine it with the reconstruction loss to create a new loss *** ensures that pixel points with smaller grey values receive greater attention,improving network *** order to verify the effectiveness of the proposed asymmetric loss function,we conducted experimental tests in the image super-resolution *** experimental results show that the model with the introduction of asymmetric loss weights improves all the indexes of the processing results without increasing the training *** the typical super-resolution network SRCNN,by introducing asymmetric weights,it is possible to improve the peak signal-to-noise ratio(PSNR)by up to about 0.5%,the structural similarity index(SSIM)by up to about 0.3%,and reduce the root-mean-square error(RMSE)by up to about 1.7%with essentially no increase in training *** addition,we also further tested the performance of the proposed method in the denoising task to verify the potential applicability of the method in the image restoration task.

关键词： Deep learning image restoration loss function image properties super resolution image denoising

Enhancing sensing capacity of terahertz metamaterial absorbers with a surface-relief design

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Photonics Research 2020年第4期8卷 519-527页

作者： WEI WANG FENGPING YAN siyu tan HAISU LI XUEMEI DU LUNA ZHANG ZHUOYA BAI DAN CHENG HONG ZHOU YAFEI HOU Key Laboratory of All Optical Network&Advanced Telecommunication of EMC Institute of Lightwave TechnologyBeijing Jiaotong UniversityBeijing 100044China Zhengzhou Xinda Institute of Advanced Technology Zhengzhou 450001China Department of Electronics Information and Communication EngineeringOsaka Institute of Technology5-16-1 OmiyaAsahi-kuOsaka535-8585Japan Graduate School of Natural Science and Technology Okayama University1-1-1 TsushimanakaKita WardOkayama Prefecture700-8530Japan

Metamaterial absorbers(MAs)serve as important electromagnetic wave-absorbing devices that have captured the attention of researchers for a long *** as sensitive detectors to determine perturbations in an ambient environment is another significant subsidiary ***,we theoretically propose an optimized fabrication method to implement terahertz MAs with fewer steps and also evaluate both absorption and sensing performances of such MAs realized by the new *** findings demonstrate that such MAs can basically maintain the original absorption features perfectly,including near-complete absorption at resonance as well as strong robustness to wide incident ***,the full width at half-maximum and quality factor of the absorption resonances attenuate less than 26%and 8%with this new method,remaining in the ranges of^0.03–0.04 THz and^20–27 for two selected example *** significantly,sensing capacities of this type of MA,in terms of maximum detection range(enhancing at least 9%),observable spectral modulation(increasing at least 6.3%),and refractive index sensitivity,are improved to a large extent because of more intense coupling between resonant field and matter in the case of surface-relief *** stronger coupling results from exposing more spots of the resonantly high field to direct contact with an approaching analyte,which is illustrated by field profiles of the MAs at resonance in this ***,other desirable absorber features are also explored with such MAs,like functioning as building blocks to configure multiband MAs and strong robustness against fabrication *** new-style terahertz MAs shown in the paper,acting as good examples,not only prove that terahertz MAs can be fabricated by the proposed time-and cost-saving route in contrast to the traditional MA fabrication process,but also can serve as novel platforms to explore other intriguing terahertz photonic effects,such as the field enhancement e

关键词： Enhancing sensing capacity terahertz metamaterial absorbers a surface-relief design

Tim-3 hampers NK cells function by disrupting PI3K-AKT-mTOR signaling pathway

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Tim-3 hampers NK cells function by disrupting PI3K-AKT-mTOR ...

一种基于重投影的改进型CBCT射束硬化伪影校正方法

第十三届全国免疫学学术大会

作者： siyu tan Shandong University

Background & Aims: NK cells exhaustion, as an impaired capacity to secrete cytokines, has been observed in tumors, including hepatocellular carcinoma(HCC).However, the underlie mechanism remains ill *** data suggests T-cell immunoglobulin mucin(Tim)-3 as a negative regulator of NK cells meditate immunity and we recently demonstrated the augmented Tim-3 expression on tumor infiltrating NK cells in HCC which is critical for NK cells ***, we reported our current work on Tim-3 downstream signal *** & Results: FCM were used to evaluate the expression of Tim-3 ligands(CEACAM1, HMGB1, Galectin-9 and PtdSer) in human HCC samples and NKL cell *** showed that PtdSer was the only one with substantial exposure on both tumor cells and NK *** of exogenous PtdSer significantly enhanced phosphorylation of Tim-3 in NKL cells, as monitored by western blot and *** functional studies showed that PtdSer interferes the expression of IFN-γ and CD107a in NK cells, which can be neutralized by Tim-3 *** immunoprecipitation(IP) assays and immunofluorescence staining demonstrated the interaction between P85 and Tim-3 in NK cell lines which further dampened the binding of P85 and P110 subunits of ***, ELISA and western blot showed that Tim-3 significantly inhibited the activation of PI3K-AKT-mTOR pathway displaying as reduced ration of PIP3/PIP2 and less phosphorylation of downstream signaling molecules(Akt, mTOR, Raptor and S6).Treatment of A66, a PI3K p110α isoform-selective inhibitor, or Rapamycin, a mTOR inhibitor, reversed the enhanced Akt or S6 phosphorylation by Tim-3 blockade, further validating the cascade of Tim-3 mediated signaling ***: Our results suggested that Tim-3 competed with PI3K p110 to bind PI3K p85, impeded downstream Akt/m TORC1 signaling, and resulted in malfunction of *** work has indicated a novel intervention target of Tim-3-based HCC thera

关键词： NK cells Tim-3 PI3K

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中国体视学与图像分析 2024年第2期29卷 116-125页

作者：刘昶韩玉王春晖席晓琦谭思宇陈卓李磊闫镔郑州大学网络空间安全学院郑州450001 战略支援部队信息工程大学信息系统工程学院郑州450001

锥束计算机断层成像(Come-Beam computed tomography,CBCT)中,由于X射线具有较宽的能谱范围,导致在重建图像中产生严重的射束硬化伪影,对实验结果造成严重干扰。因此,对射束硬化伪影的校正是十分有必要的。目前各类校正方法中,基于重投... 详细信息

锥束计算机断层成像(Come-Beam computed tomography,CBCT)中,由于X射线具有较宽的能谱范围,导致在重建图像中产生严重的射束硬化伪影,对实验结果造成严重干扰。因此,对射束硬化伪影的校正是十分有必要的。目前各类校正方法中,基于重投影的射束硬化伪影校正方法因其无需材料先验信息的特点得到了广泛应用。本文针对现有基于重投影的校正方法在校正过程中易受外界因素影响,导致校正效果下降的问题,从数据预处理、数据筛选以及校正模型求解三方面对其进行改进,以此提升校正效果。实验结果表明,本文所提方法能够更有效的实现对射束硬化伪影的校正,对比度信噪比(Contrast to Noise Ratio,CNR)、杯状伪影指数(Tcup)以及平均梯度(Average Gradient,AG)均具有不同程度的提升。

关键词： CBCT X射线无损检测重投影

Transcription factor Zhx2 restricts NK cell maturation and suppresses their antitumor immunity

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Transcription factor Zhx2 restricts NK cell maturation and s...

从ITMA ASIA+CITME 2022看纺纱机械的技术进步

第十四届全国免疫学学术大会

作者： siyu tan Chunhong Ma Shandong University

Natural killer(NK) cells contribute to the host’s first line of tumor *** NK cell effector function represents a critical immunotherapeutic approach to *** NK cells are set up throughout development to be potent killers,their roles can be subverted at the tumor ***-infiltrating NK cells frequently exhibit a dysfunctional phenotype,express decreased levels of activating receptors and increased levels of inhibitory receptors,produce fewer cytokines such as interferon(IFN)-γ,and exert low *** evidence suggests the loss of functional NK cells and the accumulation of inactive and immature NK cells in tumor microenvironment.A better understanding of the molecular regulatory mechanisms that control NK cell maturation and survival is crucial for the development of NK cell-based *** cell development is dictated by a series of transcription factors(TFs) which promote the expression of genes coding for effector molecules and cell-surface maturation ***,we identified Zhx2 as a master regulator of NK cells which restricts NK cells maturation,survival programs,and effector ***,Zhx2 lowered NK cells responses to IL-15 and transcriptionally repressed Zeb2 *** of Zhx2 in NK cells successfully enhanced the formation of mature NK cells and promoted curative antitumor immunity of adoptive NK cell *** data provide new insight into the regulatory mechanism of NK cell maturation and revealing novel opportunities for NK cell-based immunotherapy.

关键词： Zhx2 NK cell anti-tumor immunity

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棉纺织技术 2024年第5期52卷 49-54页

作者：谭嗣宇金凯薛湛洋胡文斌奚传智王泳智裴泽光东华大学上海201620

总结2022中国国际纺织机械展览会暨ITMA亚洲展览会上纺纱机械的最新技术进展。以展出的具有代表性的纺纱设备为例,重点介绍了国内外知名企业推出的新产品和创新技术,包括梳棉机、精梳机、并条机、粗纱机、细纱机、络筒机、倍捻机和新型... 详细信息

总结2022中国国际纺织机械展览会暨ITMA亚洲展览会上纺纱机械的最新技术进展。以展出的具有代表性的纺纱设备为例,重点介绍了国内外知名企业推出的新产品和创新技术,包括梳棉机、精梳机、并条机、粗纱机、细纱机、络筒机、倍捻机和新型纺纱机等。指出:展会聚焦于数字变革、绿色发展以及新兴产业跨界融合等主题,彰显了纺纱机械行业在全球经济逐步复苏的环境下对可持续和智能解决方案的关切。认为:纺纱设备的发展趋势是高效、节能、数字化、自动化和智能化。

关键词：纺织机械展览会纺纱机械梳棉机精梳机并条机数字化智能化

p-d Orbital Hybridization Engineered Single-Atom Catalyst for Electrocatalytic Ammonia Synthesis

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Energy & Environmental Materials 2024年第2期7卷 123-129页

作者： Jingkun Yu Xue Yong siyu Lu Green Catalysis Center and College of Chemistry Zhengzhou University Department of Chemistry University of Sheffield

The rational design of metal single-atom catalysts（SACs） for electrochemical nitrogen reduction reaction（NRR） is challenging. Two-dimensional metal–organic frameworks（2DMOFs） is a unique class of promising SACs. Up to now, the roles of individual metals, coordination atoms, and their synergy effect on the electroanalytic performance remain unclear. Therefore, in this work, a series of 2DMOFs with different metals and coordinating atoms are systematically investigated as electrocatalysts for ammonia synthesis using density functional theory calculations. For a specific metal, a proper metalintermediate atoms p-d orbital hybridization interaction strength is found to be a key indicator for their NRR catalytic activities. The hybridization interaction strength can be quantitatively described with the p-/d-band center energy difference（Δd-p）, which is found to be a sufficient descriptor for both the p-d hybridization strength and the NRR performance. The maximum free energy change（ΔGmax） and Δd-p have a volcanic relationship with OsC4（Se）4located at the apex of the volcanic curve, showing the best NRR performance. The asymmetrical coordination environment could regulate the band structure subtly in terms of band overlap and *** work may shed new light on the application of orbital engineering in electrocatalytic NRR activity and especially promotes the rational design for SACs.

关键词： first-principle calculations Nitrogen reduction p-d orbital hybridization single-atom catalysts

Modified dynamic event-triggered scaled formation control for multi-agent systems via a sparrow search algorithm based co-design algorithm

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Frontiers of Information Technology & Electronic Engineering 2024年第2期25卷 197-213页

作者： Yanping YANG siyu MA Dawei LI Jinghui SUO College of Information Science and Technology Donghua UniversityShanghai201620China Engineering Research Center of Digitized Textile&Apparel Technology Donghua UniversityShanghai201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Information Science and TechnologyDonghua UniversityShanghai201620China

This paper is concerned with the scaled formation control problem for multi-agent systems(MASs)over fixed and switching ***,a modified resilient dynamic event-triggered(DET)mechanism involving an auxiliary dynamic variable(ADV)based on sampled data is *** the proposed DET mechanism,a random variable obeying the Bernoulli distribution is introduced to express the idle and busy situations of communication ***,the operation of absolute value is introduced into the triggering condition to effectively reduce the formation ***,a scaled formation control protocol with the proposed resilient DET mechanism is designed over fixed and switching *** scaled formation error system is modeled as a time-varying delay ***,several sufficient stability criteria are derived by constructing appropriate Lyapunov-Krasovskii functionals(LKFs).A co-design algorithm based on the sparrow search algorithm(SSA)is presented to design the control gains and triggering parameters ***,numerical simulations of multiple unmanned aerial vehicles(UAVs)are presented to validate the designed control method.

关键词： Scaled consensus Formation control Dynamic event-triggered scheme Switching topology