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Broadband absorption performance of 3D-printed polyetheretherketone-based electromagnetic wave-absorbing composites

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Chinese Journal of Aeronautics 2024年第8期37卷 547-558页

作者： Lin BAI nan chang Meiying ZHAO Chi HOU Yi CAO Dichen LI School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Chengdu Aircraft Design and Research Institute Chengdu 610091China Xi’an Key Laboratory of Advanced Structure Design and Application of Aircraft Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory for Manufacturing System Engineering Xi’an Jiaotong UniversityXi’an 710054China

The rapid development of additive manufacturing technology has offered a new avenue for designing and fabricating high wave-absorbing meta *** this study,the mechanical properties and broadband absorption performance of Poly-Ether-Ether-Ketone(PEEK)–based electromagnetic wave–absorbing composite materials was *** high-performance polymer PEEK was used as the matrix,and the materials with electromagnetic wave loss,such as reduced graphene oxide,Carbonyl Iron(CI),and Flake CI(FCI),were used as *** on the theory of impedance matching,a wave-absorbing structure with a gradual impedance gradient was designed and *** test results showed that at the 2.0–18.0 GHz frequency band,the coverage rate of the effective absorption bandwidth was up to 72.0%,the average optimal reflectivity was–18.09 dB,and the wide-angle absorption range was 0°–30°.The advantages of additive manufacturing technology in designing and fabricating wave-absorbing structures are presented,demonstrating that the technology is an effective method for creating broadband absorbing structures.

关键词： Absorption performance Additive manufacturing Electromagnetic absorption PEEK composite materials Gradual structure Broadband absorption

A Deep Learning-Based Continuous Blood Pressure Measurement by Dual Photoplethysmography Signals

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Computers, Materials & Continua 2022年第2期70卷 2937-2952页

作者： Chih-Ta Yen Sheng-nan chang Liao Jia-Xian Yi-Kai Huang Department of Electrical Engineering Taiwan Ocean UniversityKeelung202301Taiwan Department of Internal Medicine National Taiwan UniversityYun-Lin BranchDou-Liu640Taiwan Department of Electrical Engineering National Formosa UniversityYunlin632Taiwan

This study proposed a measurement platform for continuous blood pressure estimation based on dual photoplethysmography(PPG)sensors and a deep learning(DL)that can be used for continuous and rapid measurement of blood pressure and analysis of cardiovascular-related *** proposed platform measured the signal changes in PPG and converted them into physiological indicators,such as pulse transit time(PTT),pulse wave velocity(PWV),perfusion index(PI)and heart rate(HR);these indicators were then fed into the DL to calculate blood *** hardware of the experiment comprised 2 PPG components(i.e.,Raspberry Pi 3 Model B and analog-todigital converter[MCP3008]),which were connected using a serial peripheral *** DL algorithm converted the stable dual PPG signals acquired from the strictly standardized experimental process into various physiological indicators as input parameters and finally obtained the systolic blood pressure(SBP),diastolic blood pressure(DBP)and mean arterial pressure(MAP).To increase the robustness of the DL model,this study input data of 100 Asian participants into the training database,including those with and without cardiovascular disease,each with a proportion of approximately 50%.The experimental results revealed that the mean absolute error and standard deviation of SBP was 0.17±0.46 *** mean absolute error and standard deviation of DBP was 0.27±0.52 *** mean absolute error and standard deviation of MAP was 0.16±0.40 mmHg.

关键词： Deep learning(DL) blood pressure continuous non-invasive blood pressure measurement photoplethysmography(PGG)

Preparation, Structure and Properties of 3D Supramolecular Architecture, on the Basis of Hydrogen Bonds and π-π Stacking Between 2D Layers, with Windmill Building Blocks

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Chemical Research in Chinese Universities 2008年第3期24卷 251-254页

作者： YU Li-qiong HUANG Ru-dan CHI Ying-nan HU chang-wen Department of Chemistry Beijing Institute of Technology Beijing 100081 P R. China

A novel three-dimensional（3D） supramolecular architecture, {[Nd（OH-BDC）（OH-HBDC）（H2O）2]·2HaO）n（1）（OH-H2BDC=5-hydroxyisophthalic acid）, which was formed through hydrogen bonds and π-π stacking between two-dimensional（2D） layers, was hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Windmill building blocks, which consist of two nine-coordinated metal centers and four OH-H2BDC groups are connected through two carboxyl groups, to lead to a one-dimensional infinite inorganic chain（… M--O--C--O--M…） along the [100] direction. An observed intense blue luminescence with an emission band peaked at 390 nm for compound 1 may results from ligand-to-metal charge transfer（LMCT）. Variable-temperature magnetic susceptibility of compound 1 was investigated and the value was deviated from the Curie-Weiss law.

关键词： Building block π-π stacking Hydrogen bond Luminescence Magnetism

Overlapping Cardiac Programs in Heart Development and Regeneration

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Journal of Genetics and Genomics 2012年第9期39卷 443-449页

作者： Yi-Song Zhen Qing Wu Cheng-Lu Xiao nan-nan chang Xu Wang Lei Lei Xiaojun Zhu Jing-Wei Xiong Institute of Molecular Medicine Peking UniversityBeijing 100871China State Key Laboratory of Cardiovascular Disease Fuwai Hospital&Cardiovascular InstituteChinese Academy of Medical SciencesPeking Union Medical CollegeBeijing 100037China

Gaining cellular and molecular insights into heart development and regeneration will likely provide new therapeutic targets and opportunities for cardiac regenerative medicine,one of the most urgent clinical needs for heart *** we present a review on zebrafish heart development and regeneration,with a particular focus on early cardiac progenitor development and their contribution to building embryonic heart,as well as cellular and molecular programs in adult zebrafish heart *** attempt to emphasize that the signaling pathways shaping cardiac progenitors in heart development may also be redeployed during the progress of adult heart regeneration.A brief perspective highlights several important and promising research areas in this exciting field.

关键词： Cardiac progenitors Heart development Heart regeneration Zebrafish

Epigenetic regulation in plant abiotic stress responses

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Journal of Integrative Plant Biology 2020年第5期62卷 563-580页

作者： Ya-nan chang Chen Zhu Jing Jiang Huiming Zhang Jian-Kang Zhu Cheng-Guo Duan Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences Chinese Academy of Sciences201602China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityKaifeng 475004China Department of Horticulture and Landscape Architecture Purdue UniversityWest LafayetteIN 47907USA

In eukaryotic cells,gene expression is greatly influenced by the dynamic chromatin *** mechanisms,including covalent modifications to DNA and histone tails and the accessibility of chromatin,create various chromatin states for stress-responsive gene expression that is important for adaptation to harsh environmental *** studies have revealed that many epigenetic factors participate in abiotic stress responses,and various chromatin modifications are changed when plants are exposed to stressful *** this review,we summarize recent progress on the cross-talk between abiotic stress response pathways and epigenetic regulatory pathways in *** review focuses on epigenetic regulation of plant responses to extreme temperatures,drought,salinity,the stress hormone abscisic acid,nutrient limitations and ultraviolet stress,and on epigenetic mechanisms of stress memory.

关键词： stress ultraviolet extreme

Utilizing a microfluidic device to enrich and fluorescently detect circulating tumor cells

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Science Bulletin 2017年第7期62卷 453-455页

作者： Ya-nan chang Mingyi Zhang Juan Li Kui Chen Weihong Gu Gengmei Xing CAS Key Laboratory for Biomedical Effects of nanomaterial & nanosafety Institute of High Energy PhysicsChinese Academy of Science

Circulating tumor cells(CTCs)are cancer cells that have propagated from primary tumor sites,spreading into the bloodstream as the cellular origin of fatal metastasis,and to secondary tumor *** and analyzing CTCs is a kind of‘‘liquid biopsy'of the tumor that provides information about cancer changes over time and tailoring treatment[1].CTC enrichment and detection remains technologically challenging due to their extremely low concentra-

关键词： QDs cell line MCF Utilizing a microfluidic device to enrich and fluorescently detect circulating tumor cells

1-Methyl-3-octylimidazolium Polyoxomolybdate Ionic Liquid with Low Melting Point and High Stability:Preparation and Photocatalytic Activity

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Chemical Research in Chinese Universities 2011年第2期27卷 177-180页

作者： DONG Tao XU Yan-qing CHEN Fa-wang CHI Ying-nan HU chang-wen State Key Laboratory of Explosion Science and Technology Department of ChemistryInstitute for Chemical Physics Beo＇ing Institute of Technology Beijing 100081 P R. China

The polyoxometalate（POM）-imidazole ionic liquid（IL） [C8mim]2[Mo6O19]（C8mim=1-methyl-3-octylimi- dazolium） with a low melting point of 82.6 °C was successfully prepared and characterized by FTIR, XPS, NMR, TG and so on. The polyoxomolybdate-based IL has high stability, and its decomposing temperature reaches 321 °C, which is higher than that of 1-alkyl-3-methylimidazolium halides IL. Further photocatalytic performances of the IL were measured via degrading dye rhodamine B（RB） in aqueous solution under the UV light irradiation. The experiments show that the conversion of RB reaches 80.5% after 90 min under UV-light and the degradation efficiency depends on the pH value of the solution, irradiation time and the dosage of the IL and so on.

关键词： Ionic liquid Polyoxomolybdate Low melting point High stability Photocatalytic activity

Virtual-Real Integration Leads Innovation

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China News Release 2023年第11期 43-44页

作者： nan chang 不详

nanchang in east China’s Jiangxi Province played host to the 2023 World Conference on VR(virtual reality)Industry from October 19 to ***“VR Adorns the World:Integrating the Real and the Virtual Worlds to Boost All Industries,”the event was co-hosted by the Ministry of Industry and Information Technology and the People’s Government of Jiangxi Province.

关键词： Province. nanchang Integration

NUCLEAR PORE ANCHOR and EARLY IN SHORT DAYS 4 negatively regulate abscisic acid signaling by inhibiting Snf1-related protein kinase2 activity and stability in Arabidopsis

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Journal of Integrative Plant Biology 2022年第11期64卷 2060-2074页

作者： Ya-nan chang Zhijuan Wang Ziyin Ren Chun-Han Wang Pengcheng Wang Jian-Kang Zhu Xia Li Cheng-Guo Duan Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences the Chinese Academy of ScienceShanghai 201602China University of Chinese Academy of Sciences Beijing 100049China National Key Laboratory of Crop Genetic and Improvement College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070China Department of Horticulture and Architecture Landscape Purdue UniversityWest LafayetteIN 47907USA

Abscisic acid(ABA)is a key regulator of plant responses to abiotic stresses,such as *** acid receptors and coreceptors perceive ABA to activate Snf1-related protein kinase2 s(SnRK2s)that phosphorylate downstream effectors,thereby activating ABA signaling and the stress *** stress responses come with fitness penalties for plants,it is crucial to tightly control SnRK2 kinase activity to restrict ABA ***,how SnRK2 kinases are inactivated remains ***,we show that NUCLEAR PORE ANCHOR(NUA),a nuclear pore complex(NPC)component,negatively regulates ABA-mediated inhibition of seed germination and post-germination growth,and drought tolerance in Arabidopsis *** role of NUA in response to ABA depends on SnRK2.2 and SnRK2.3 for seed germination and on SnRK2.6 for *** does not directly inhibit the phosphorylation of these SnRK2s or affects their ***,the NUA-interacting protein EARLY IN SHORT DAYS 4(ESD4),a SUMO protease,negatively regulates ABA signaling by directly interacting with and inhibiting SnRK2 phosphorylation and protein *** importantly,we demonstrated that SnRK2.6 can be SUMOylated in vitro,and ESD4 inhibits its *** together,we identified NUA and ESD4 as SnRK2 kinase inhibitors that block SnRK2 activity,and reveal a mechanism whereby NUA and ESD4 negatively regulate plant responses to ABA and drought stress possibly through SUMOylation-dependent regulation of SnRK2s.

关键词： ABA drought tolerance ESD4 NUA SnRK2