检索结果-南通市图书馆

Mechanically reprogrammable Pancharatnam-Berry metasurface for microwaves

Advanced Photonics 2022年第1期4卷 69-79页

作者： Quan Xu Xiaoqiang Su Xueqian Zhang Lijuan Dong Lifeng Liu Yunlong Shi Qiu Wang Ming Kang Andrea Alù Shuang Zhang Jiaguang Han Weili Zhang Tianjin University Center for Terahertz Waves and College of Precision Instrument and Optoelectronics EngineeringKey Laboratory of Optoelectronic Information Technology(Ministry of Education of China)TianjinChina Shanxi Datong University Institute of Solid State Physics and College of Physics and Electronic ScienceShanxi Province Key Laboratory of Microstructure Electromagnetic Functional MaterialsDatongChina Wuhan University of Technology School of Information EngineeringWuhanChina Tianjin Normal University College of Physics and Materials ScienceTianjinChina City University of New York Advanced Science Research CenterPhotonics InitiativeNew YorkUnited States City University of New York Graduate CenterPhysics ProgramNew YorkUnited States University of Hong Kong Faculty of ScienceDepartment of PhysicsHong KongChina University of Hong Kong Department of Electrical and Electronic EngineeringHong KongChina Guilin University of Electronic Technology Guangxi Key Laboratory of Optoelectronic Information ProcessingSchool of Optoelectronic EngineeringGuilinChina Oklahoma State University School of Electrical and Computer EngineeringStillwaterOklahomaUnited States

Metasurfaces have enabled the realization of several optical functionalities over an ultrathin platform,fostering the exciting field of flat optics.Traditional metasurfaces are achieved by arranging a layout of static meta-atoms to imprint a desired operation on the impinging wavefront,but their functionality cannot be altered.Reconfigurability and programmability of metasurfaces are the next important step to broaden their impact,adding customized on-demand functionality in which each meta-atom can be individually reprogrammed.We demonstrate a mechanical metasurface platform with controllable rotation at the meta-atom level,which can implement continuous Pancharatnam–Berry phase control of circularly polarized microwaves.As the proof-of-concept experiments,we demonstrate metalensing,focused vortex beam generation,and holographic imaging in the same metasurface template,exhibiting versatility and superior performance.Such dynamic control of electromagnetic waves using a single,low-cost metasurface paves an avenue towards practical applications,driving the field of reprogrammable intelligent metasurfaces for a variety of applications.

关键词： reprogrammable metasurfaces Pancharatnam-Berry phase mechanical metasurfaces microwaves

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Aggregation-induced emission luminogens for highly effective microwave dynamic therapy

引用

Bioactive Materials 2022年第1期7卷 112-125页

作者： Nil Kanatha Pandey Wei Xiong Lingyun Wang Wei Chen Brian Bui Jian Yang Eric Amador Mingli Chen Christina Xing Aseem Atul Athavale Yaowu Hao Wirya Feizi Lloyd Lumata Department of Physics The University of Texas at ArlingtonArlingtonTX 76019USA Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou510640China Department of Biomedical Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA Department of Chemistry College of SciencesNortheastern UniversityBox 332Shenyang 110819China Department of Materials Science and Engineering The University of Texas at ArlingtonArlingtonTX 76019USA Department of Physics The University of Texas at Dallas800 West Campbell RoadRichardsonTX 75080USA

Aggregation-induced emission luminogens(AIEgens)exhibit efficient cytotoxic reactive oxygen species(ROS)generation capability and unique light-up features in the aggregated state,which have been well explored in image-guided photodynamic therapy(PDT).However,the limited penetration depth of light in tissue severely hinders AIEgens as a candidate for primary or adjunctive therapy for clinical applications.Coincidentally,microwaves(MWs)show a distinct advantage for deeper penetration depth in tissues than light.Herein,for the first time,we report AIEgen-mediated microwave dynamic therapy(MWDT)for cancer treatment.We found that two AIEgens(TPEPy-I and TPEPy-PF6)served as a new type of microwave(MW)sensitizers to produce ROS,including singlet oxygen(1O2),resulting in efficient destructions of cancer cells.The results of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)and live/dead assays reveal that the two AIEgens when activated by MW irradiation can effectively kill cancer cells with average IC-50 values of 2.73 and 3.22μM,respectively.Overall,the ability of the two AIEgens to be activated by MW not only overcomes the limitations of conventional PDT,but also helps to improve existing MW ablation therapy by reducing the MW dose required to achieve the same therapeutic outcome,thus reducing the occurrence of side-effects of MW radiation.

关键词： AIEgens microwaves Photodynamic therapy Reactive oxygen species Microwave ablation Cancer treatment Singlet oxygen

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effectiveness of microwave endometrial ablation combined with hysteroscopic transcervical resection in treating submucous uterine myomas

引用

World Journal of Clinical Cases 2022年第36期10卷 13200-13207页

作者： Toshiyuki Kakinuma Kaoru Kakinuma Ayano Shimizu Ayaka Kaneko Masataka Kagimoto Takafumi Okusa Eri Suizu Koyomi Saito Yoshio Matsuda Kaoru Yanagida Nobuhiro Takeshima Michitaka Ohwada Department of Obstetrics and Gynecology International University of Health and Welfare HospitalNasushiobara 329-2763Japan

BACKGROUND Hypermenorrhea is characterized by excessive menstrual bleeding that causes severe anemia and interferes with everyday life.This condition can restrict women’s social activities and decrease their quality of life.Microwave endometrial ablation(MEA)using a 2.45-GHz energy source is a minimally invasive alternative to conventional hysterectomy for treating hypermenorrhea that is resistant to conservative treatment,triggered by systemic disease or medications,or caused by uterine myomas and fibrosis.The popularity of MEA has increased worldwide.Although MEA can safely and effectively treat submucous myomas,some patients may still experience recurrent hypermenorrhea postoperatively and may require additional treatment.AIM To investigate the efficacy of MEA combined with transcervical resection(TCR).METHODS Participants underwent cervical and endometrial evaluations.Magnetic resonance imaging and hysteroscopy were performed to evaluate the size and location of the myomas.TCR was performed before MEA using a hystero-resectoscope.MEA was performed using transabdominal ultrasound.The variables included operation time,number of ablation cycles,length of hospital stay,and visual analog scale cores for hypermenorrhea,dysmenorrhea,and treatment satisfaction at 3 and 6 mo postoperatively.The postoperative incidence of amenorrhea,changes in hemoglobin concentrations,and MEA-related complications were evaluated.RESULTS A total of 34 women underwent a combination of MEA and TCR during the study period.Two patients were excluded from the study as their histopathological tests identified uterine malignancies(uterine sarcoma and endometrial cancer).The 32 eligible women(6 nulliparous,26 multiparous)had a mean age of 45.2±4.3 years(range:36–52 years).Patients reported very severe hypermenorrhea(10/10 points on the visual analog scale)before the procedure.However,after the procedure,the hypermenorrhea scores decreased to 1.2±1.3 and 0.9±1.3 at 3 and 6 mo,respectively(P<0.001).The mean follow-up duration was 33.8±16.8 mo.Al

关键词： Dysmenorrhea Endometrial ablation techniques Menorrhagia microwaves Myoma Uterus

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Electrically reconfigurable microwave metasurfaces [Invited]

引用

Chinese Optics Letters 2022年第10期20卷 76-90页

作者：邵琳达张金 Ivan D.Rukhlenko 朱卫仁 Department of Electronic Engineering Shanghai Jiao Tong UniversityShanghai 200240China Institute of Photonics and Optical Science School of PhysicsThe University of SydneyCamperdownNSW 2006Australia

Metasurfaces are ultrathin metamaterials constructed by planar meta-atoms with tailored electromagnetic responses.They have attracted tremendous attention owing to their ability to freely control the propagation of electromagnetic waves.With active elements incorporated into metasurface designs,one can realize tunable and reconfigurable metadevices with functionalities controlled by external stimuli,opening up a new platform to dynamically manipulate electromagnetic waves.In this article,we review the recent progress on tunable and reconfigurable metasurfaces,focusing on their operation principles and practical applications.We describe the approaches to the engineering of reconfigurable metasurfaces categorized into different classes based on the available active materials or elements,which can offer uniform manipulations of electromagnetic waves.We further summarize the recent achievements on programmable metasurfaces with constitutional meta-atoms locally tuned by external stimuli,which can dynamically control the wavefronts of electromagnetic waves.Finally,we discuss time-modulated metasurfaces,which are meaningful to exploit the temporal dimension by applying a dynamic switching of the coding sequence.The review is concluded by our outlook on possible future directions and existing challenges in this fast developing field.

关键词： reconfigurable metasurfaces metamaterials microwaves

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effectiveness of treating menorrhagia using microwave endometrial ablation at a frequency of 2.45 GHz

引用

世界临床病例杂志 2023年第24期11卷 5653-5659页

作者： Toshiyuki Kakinuma Ayaka Kaneko Kaoru Kakinuma Yoshio Matsuda Kaoru Yanagida NobuhiroTakeshima Michitaka Ohwada Department of Obstetrics and Gynecology International University of Health and Welfare HospitalNasushiobara 329-2763Japan

BACKGROUND Microwave endometrial ablation(MEA)is a minimally invasive treatment for menorrhagia.It has been covered by the national insurance in Japan since April 2012,and its demand has been increasing as the importance of women’s health has advanced in society.AIM To examine the efficacy of MEA as a treatment option for menorrhagia.METHODS In this study,we retrospectively analyzed 76 patients who underwent MEA between January 2016 and March 2020 in our department.MEA was performed in the lithotomy position,under general anesthesia,and with transabdominal ultrasound guidance,including the entire endometrial circumference while confirming endometrial coagulation.The Microtaze AFM-712 and the Sounding Applicator CSA-40CBL-1006200C were used for MEA,and the endometrium was ablated using a Microtaze output of 70 W and coagulation energization time of 50 s per cycle.The visual analog scale(VAS)was used to evaluate menorrhagia,menstrual pain,and treatment satisfaction.Additionally,the hemoglobin(Hb)levels before and after MEA and associated complications were investigated.RESULTS The average age of the patients was 44.8±4.0 years.While 14 patients had functional menorrhagia,62 had organic menorrhagia,of whom 14 had endometrial polyps,40 had uterine fibroids,and 8 had adenomyosis.The VAS score before MEA and 3 and 6 mo after the procedure were 10,1.3±1.3,and 1.3±1.3,respectively,for menorrhagia and 10,1.3±1.8,and 1.3±1.8,respectively,for menstrual pain,both showing improvements(P<0.001).The MEA Hb level significantly improved from 9.2±4.2 g/dL before MEA to 13.4±1.2 g/dL after MEA(P=0.003).Treatment satisfaction was high,with a VAS score of 9.6±0.7.Endometritis was observed in one patient after surgery and was treated with antibiotics.CONCLUSION MEA is a safe and effective treatment for menorrhagia.

关键词： Menorrhagia Visual analog scale Dysmenorrhea Endometrial ablation techniques microwaves Leiomyoma Adenomyosis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current status of applying microwave-associated catalysis for the degradation of organics in aqueous phase – A review

引用

Journal of Environmental Sciences 2019年第7期31卷 119-135页

作者： Chao Xue Yanpeng Mao Wenlong Wang Zhanlong Song Xiqiang Zhao Jing Sun Yanxiang Wang School of Energy and Power Engineering Shandong University School of Material Science & Engineering Shandong University

Interactions between microwaves and certain catalysts can lead to efficient, energy-directed convergence of a relatively dispersed microwave field onto the reactive sites of the catalyst,which produces thermal or discharge effects around the catalyst. These interactions form"high-energy sites"(HeS) that promote energy efficient utilization and enhanced in situ degradation of organic pollutants. This article focuses on the processes occurring between microwaves and absorbing catalysts, and presents a critical review of microwave-absorbing mechanisms. This article also discusses aqueous phase applications of relevant catalysts(ironbased, carbon-based, soft magnetic, rare earth, and other types) and microwaves, special effects caused by the dimensions and structures of catalytic materials, and the optimization and design of relevant reactors for microwave-assisted catalysis of wastewater. The results of this study demonstrate that microwave-assisted catalysis can effectively enhance the degradation rate of organic compounds in an aqueous phase and has potential applications to a variety of engineering fields such as microwave-assisted pyrolysis, pollutant removal,material synthesis, and water treatment.

关键词： microwaves Catalysts High energy sites Organics degradation Aqueous phase

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of GSM 1800 MHz on dendritic development of cultured hippocampal neurons

引用

Acta Pharmacologica Sinica 2007年第12期28卷 1873-1880页

作者： Wei NING~2,Shu-jun XU~2,Huai CHIANG~3,Zheng-ping XU~3,Su-ya ZHOU~2,Wei YANG,Jian-hong LUO~(2,4)~2 Department of Neurobiology,Zhejiang University School of Medicine,Hangzhou 310058,China ~3 Bioelectromagnetics Laboratory,ZhejiangUniversity School of Medicine,Hangzhou 310058,China Department of Neurobiology Zhejiang University School of Medicine Hangzhou China Bioelectromagnetics Laboratory Zhejiang University School of Medicine Hangzhou China

Aim:To evaluate the effects of global system for mobile communications (GSM)1800 MHz microwaves on dendritic filopodia,dendritic arborization,and spinematuration during development in cultured hippocampal neurons in rats.Methods:The cultured hippocampal neurons were exposed to GSM 1800 MHz microwaveswith 2.4 and 0.8 W/kg,respectively,for 15 min each day from 6 days in vitro (DIV6)to DIV14.The subtle structures of dendrites were displayed by transfection withfarnesylated enhanced green fluorescent protein (F-GFP) and GFP-actin on DIV5into the hippocampal neurons.Results:There was a significant decrease in thedensity and mobility of dendritic filopodia at DIV8 and in the density of maturespines at DIV14 in the neurons exposed to GSM 1800 MHz microwaves with2.4 W/kg.In addition,the average length of dendrites per neuron at DIV10 andDIV14 was decreased,while the dendritic arborization was unaltered in theseneurons.However,there were no significant changes found in the neurons ex-posed to the GSM 1800 MHz microwaves with 0.8 W/kg.Conclusion:Thesedata indicate that the chronic exposure to 2.4 W/kg GSM 1800 MHz micro-waves during the early developmental stage may affect dendritic developmentand the formation of excitatory synapses of hippocampal neurons in culture.

关键词： global system for mobile communications microwaves dendritic filopodia dendritic arborization spines hippocampal neurons

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Modulation of heat shock protein response in SH-SY5Y by mobile phone microwaves

引用

World Journal of Biological Chemistry 2012年第2期3卷 34-40页

作者： Emanuele Calabrò Salvatore Condello Monica Currò Nadia Ferlazzo Daniela Caccamo Salvatore Magazù Riccardo Ientile Department of Phys-ics University of Messina 98166 Messina Italy Department of Biochemical Physi-ological and Nutritional Sciences University of Messina 98125 Messina Italy

AIM: To investigate putative biological damage caused by GSM mobile phone frequencies by assessing electromagnetic fields during mobile phone working. METHODS: Neuron-like cells, obtained by retinoicacid-induced differentiation of human neuroblastoma SH-SY5Y cells, were exposed for 2 h and 4 h to microwaves at 1800 MHz frequency bands. RESULTS: Cell stress response was evaluated by MTT assay as well as changes in the heat shock protein expression (Hsp20, Hsp27 and Hsp70) and caspase-3 activity levels, as biomarkers of apoptotic pathway. Under our experimental conditions, neither cell viability nor Hsp27 expression nor caspase-3 activity was significantly changed. Interestingly, a significant decrease in Hsp20 expression was observed at both times of exposure, whereas Hsp70 levels were significantly increased only after 4 h exposure. CONCLUSION: The modulation of the expression of Hsps in neuronal cells can be an early response to radiofrequency microwaves.

关键词： Apoptosis Electromagnetic field Heat shock proteins microwaves SH-SY5Y differentiated cells

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Near-field chiral excitation of universal spin-momentum locking transport of edge waves in microwave metamaterials

引用

Advanced Photonics 2022年第4期4卷 46-55页

作者： Zhixia Xu Jie Chang Jinye Tong Daniel F.Sievenpiper Tie Jun Cui Southeast University State Key Laboratory of Millimeter WavesNanjingChina Dalian Maritime University School of Information Science and TechnologyDalianChina University of California San Diego Department of Electrical and Computer EngineeringSan DiegoCaliforniaUnited States

Controlling energy flow in waveguides has attractive potential in integrated devices from radio frequencies to optical bands.Due to the spin-orbit coupling,the mirror symmetry will be broken,and the handedness of the near-field source will determine the direction of energy transport.Compared with well-established theories about spin-momentum locking,experimental visualization of unidirectional coupling is usually challenging due to the lack of generic chiral sources and the strict environmental requirement.In this work,we design a broadband near-field chiral source in the microwave band and discuss experimental details to visualize spin-momentum locking in three different metamaterial waveguides,including spoof surface plasmon polaritons,line waves,and valley topological insulators.The similarity of these edge waves relies on the abrupt sign change of intrinsic characteristics of two media across the interface.In addition to the development of experimental technology,the advantages and research status of interface waveguides are summarized,and perspectives on future research are presented to explore an avenue for designing controllable spin-sorting devices in the microwave band.

关键词： chirality metamaterials microwaves spoof surface plasmon polaritons waveguides

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Design of a variable frequency comb reflectometer system for the ASDEX Upgrade tokamak

引用

Plasma Science and Technology 2020年第6期22卷 8-14页

作者： T HAPPEL W KASPAREK P HENNEQUIN K HÖFLER C HONORÉ the ASDEX Upgrade Team Max-Planck-Institut für Plasmaphysik Boltzmannstr.285748 GarchingGermany IGVP Universität StuttgartPfaffenwaldring 3170569 StuttgartGermany Laboratoire de Physique des Plasmas CNRSÉcole PolytechniqueSorbonne UniversitéF-91120 PalaiseauFrance Physik-Department E28 Technische Universität MünchenJames-Franck-Str.185748 GarchingGermany 不详

Comb reflectometers offer the advantage of measuring several radial positions in plasma simultaneously.This allows for the investigation of fast timescales during L-H transitions,I-phases,I-mode bursts,transients during heat wave propagation,etc.A drawback of many present-day systems is that they use a fixed frequency difference between the probing frequencies.Hence,although the central probing frequency can be varied,the probing frequency difference is usually fixed.The new design presented in this work uses an advanced microwave generation and detection scheme,which allows for arbitrary probing frequencies and probing frequency separations.

关键词： reflectometry microwaves plasma diagnostic reflectometer turbulence

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：