检索结果-南通市图书馆

THz trapped ion model and THz spectroscopy detection of potassium channels

Nano Research 2022年第4期15卷 3825-3833页

作者： Kaicheng Wang Shaomeng Wang Lixia Yang Zhe Wu Baoqing Zeng yubin gong School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China

Advanced molecular dynamics(MD)simulation and infrared(IR)spectroscopy have been widely adopted to reveal the detailed dynamic process of high-speed selective permeability of potassium *** these MD simulations cannot avoid the choice of empirical molecular force fields and high transmembrane voltages(as driving electric fields for ions)far exceeding physiological ***,the IR spectroscopy method usually requires isotope labels for carbonyl groups of the channels,which may change the original permeation ***,we build the terahertz(THz)trapped ion model for the selectivity filter(SF)of potassium channels KcsA based on the density functional theory(DFT)calculation of ion *** this model,the zero-point energy of trapped ions and quantum tunneling effect provide the physical basis for near diffusion limited permeation rates of ions and explain the high driving electric field in MD *** calculations of zero-point energy and tunneling probability show that the quantum effect assisted knock-on mechanism may help to realize the physiological functions of potassium ***,based on the trapped ion model,we calculated the ion decoherence timescale under the influence of protein environmental *** use the quantum optics method to describe the interaction between THz waves and the trapped *** the novel THz spectroscopy approaches through the THz resonance fluorescence and the intense field non-resonant effect are presented *** are expected to be isotope label-free detective methods of the rapid ion permeation dynamics.

关键词： potassium channels trapped ions zero-point energy quantum tunneling effect terahertz spectrum density functional theory(DFT)calculation

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

Investigation of artifacts by mapping SAR in thermoacoustic imaging

引用

Journal of Innovative Optical Health Sciences 2021年第5期4卷 75-84页

作者： Xiao Liang Qiang Liu Zezhou Sun Weizhi Qi yubin gong Lei Xi School of Physics University of Electronic Science and Technology of China ChengduSichuan 610054P.R.China Department of Biomedical Engineering Southern University of Science and Technology ShenzhenGuangdong 518055P.R.China School of Electrical Science and Engineering University of Electronic Science and Technology of China ChengduSichuan 610054P.R.China

Microwave-induced thermoacoustic imaging(MI-TAI)remains one of the focus of attention among biomedical imaging modalities over the last ***,the transmission and dis-tribution of microwave inside bio-tissues are complicated,thus result in severe *** this study,to reveal the underlying mechanisms of artifacts,we deeply investigate the distribution of specific absorption rate(SAR)inside tissue-mimicking phantoms with varied morphological features using both mathematical simulations and corresponding *** simulated results,which are confirmed by the associated experimental results,show that the SAR distri-bution highly depends on the geometries of the imaging targets and the polarizing features of the *** addition,we propose the potential mechanisms including Mie-scattering,Fabry-Perot-feature,small curvature effect to interpret the diffraction effect in different scenarios,which may provide basic guidance to predict and distinguish the artifacts for TAI in both fundamental and clinical studies.

关键词： Imaging microwave thermoacoustic imaging artifacts specific absorption rate

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

Biomedical microwave-induced thermoacoustic imaging

引用

Journal of Innovative Optical Health Sciences 2022年第4期15卷 13-48页

作者： Qiang Liu Xiao Liang Weizhi Qi yubin gong Huabei Jiang Lei Xi Department of Biomedical Engineering Southern University of Science and Technology Shenzhen Guangdong518055P.R.China Guangdong Provincial Key Laboratory of Advanced Biomaterials Department of Biomedical Engineering Southern University of Science and Technology Shenzhen Guangdong518055P.R.China School of Electrical Science and Engineering University of Electronic Science and Technology of China Chengdu Sichuan610054P.R.China Department of Medical Engineering University of South Florida TampaFL 33620USA

Microwave induced thermoacoustic imaging(MTAI)has emerged as a potential biomedical imaging modality with over 20-year *** typically employs pulsed microwave as the pumping source,and detects the microwave-induced ultrasound wave via acoustic ***,it features high acoustic resolution,rich elect romagnetic contrast,and large imaging *** from these unique advantages,MTAI has been extensively applied to various fields including pathology,biology,material and *** now,MTAI has been deployed for a wide range of biomedical applications,including cancer diagnosis,joint evaluation,brain in-vestigation and *** paper provides a comprehensive review on(1)essential physics(endogenous/exogenous contrast mechanisms,penetration depth and resolution),(2)hardware configurations and software implementations(excit ation source,antenna,ultrasound detector and image recovery algorithm),(3)animal studies and clinical applications,and(4)future directions.

关键词： Thermoacoustic imaging biomedical imaging electromagnetic radiation acoustic waves biomedical image processing

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

STUDY ON RECTANGULAR WAVEGUIDE GRATING SLOW-WAVE STRUCTURE WITH COSINE-SHAPED GROOVES

引用

Journal of Electronics(China) 2007年第3期24卷 384-389页

作者： Lu Zhigang Wei Yanyu gong yubin Wu Zhoumiao Wang Wenxiang School of Physical Electronics University of Electronic Science and Technology of China Chengdu 510054 China

This paper focuses on a new rectangular waveguide grating Slow-Wave Structure (SWS) with cosine-shaped grooves and studies the propagation characteristics of the wave in the SWS. By using the approximate field-matching conditions,the dispersion equation and the coupling impedance of this circuit are obtained. The dispersion curves and coupling impedances of the fundamental wave are calculated and the influences of the various geometrical dimensions are discussed. The results show that the bandwidth of the cosine-shaped groove SWS is much wider than that of rectangular-shaped groove one. And reducing the groove width can broaden the frequency-band and decrease the phase-velocity,while increment of the groove-depth can also decrease phase-velocity. For above cases,the coupling impedance is more than 16Ω. The present analysis will be helpful on further study and design of the RF systems used in millimeter wave Traveling Wave Tube (TWT).

关键词： Traveling Wave Tub (TWT) Rectangular waveguide grating Cosine-shaped groove Dispersion equation Coupling impedance

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

Numerical study on THz radiation of two-dimensional plasmon resonance of GaN HEMT array

引用

Chinese Physics B 2023年第4期32卷 268-276页

作者：郭宏阳张平杨生鹏王少萌宫玉彬 National Key Laboratory of Science and Technology on Vacuum Electronics University of Electronic Science and Technology of ChinaChengdu 610031China

The Ga N high electron mobility transistor(HEMT)has been considered as a potential terahertz(THz)radiation source,yet the low radiation power level restricts their *** HEMT array is thought to improve the coupling efficiency between two-dimensional(2D)plasmons and THz *** this work,we investigate the plasma oscillation,electromagnetic radiation,and the integration characteristics of Ga N HEMT targeting at a high THz radiation power *** quantitative radiation power and directivity are obtained for integrated Ga N HEMT array with different array periods and element *** the same initial plasma oscillation phase among the HEMT units,the radiation power of the two-element HEMT array can achieve 4 times as the single HEMT radiation power when the array period is shorter than 1/8electromagnetic *** addition,the radiation power of the HEMT array varies almost linearly with the element number,the smaller array period can lead to the greater radiation *** shows that increasing the array period could narrow the main radiated lobe width while weaken the radiation *** the element number can improve both the radiation directivity and *** also synchronize the plasma wave phases in the HEMT array by adopting an external Gaussian plane wave with central frequency the same as the plasmon resonant frequency,which solves the problem of the radiation power reduction caused by the asynchronous plasma oscillation phases among the *** study of the radiation power amplification of the one-dimensional(1D)Ga N HEMT array provides useful guidance for the research of compact high-power solid-state terahertz sources.

关键词： GaN HEMT array two-dimensional(2D)plasmons THz emission

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

Electron-beam-driven anomalous Doppler effects in Smith–Purcell radiation

引用

Photonics Research 2024年第1期12卷 78-84页

作者： XIAOQIUYAN ZHANG TIANYU ZHANG ZHUOCHENG ZHANG XINGXING XU DIWEI LIU ZHAOYUN DUAN YANYU WEI yubin gong LIANG JIE WONG MIN HU Terahertz Research Center School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China Key Laboratory of Terahertz Technology Ministry of EducationChengdu 610054China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

The interaction between electrons and matter is an effective means of light emission,through mechanisms including Cherenkov radiation and Smith–Purcell radiation(SPR).In this study,we show that the superlight inverse Doppler effects can be realized in reverse Smith–Purcell radiation excited by a free electron beam with a homogeneous *** particular,we find that two types of anomalous SPR exist in the homogenous substrate:special SPR and reverse *** results reveal that the electron velocity can be tuned to simultaneously excite different combinations of normal SPR,special SPR,and reverse *** proposed manifold light radiation mechanism can offer greater versatility in controlling and shaping SPR.

关键词： anomalous beam Electron

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

Tunable optical topological transition of Cherenkov radiation

引用

Photonics Research 2022年第7期10卷 1650-1660页

作者： TIANYU ZHANG XIAOQIUYAN ZHANG ZHUOCHENG ZHANG XINGXING XU YUEYING WANG ZHAOYUN DUAN YANYU WEI yubin gong SHENGGANG LIU MIN HU TAO ZHAO Terahertz Research Center School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China Key Laboratory of Terahertz Technology Ministry of EducationChengdu 610054China

Approaches to generate and manipulate Cherenkov radiation(CR)are challenging yet *** topological transition(OTT)in novel materials and metamaterials is also promising for modern *** study the OTT of CR in graphene-based hyperbolic metamaterials(GHMs)for the first *** GHMs,conventional and hyperbolic CR can be switched when crossing the topological transition *** frequency can be altered by metamaterial components and external optical *** instance,external ultrafast optical pumps cause an ultrafast OTT from the elliptical to the hyperbolic ***,hyperbolic CR can be excited by lowenergy electrons by leveraging the excellent photothermal properties of *** CR vanishes when the GHM returns to its original ***,graphene nonlocality occurs when the electron velocity is low enough,corresponding to a large wave ***,when the electron velocity approaches the Fermi velocity of graphene,a nonlocality-induced OTT modifies the plasmonic properties of the GHM and brings a new lower velocity threshold of hyperbolic ***,hyperbolic CR can only be induced in a limited velocity *** findings pave the way for understanding CR properties in active plasmonic metamaterials and may be applied to complex photonic and polaritonic systems.

关键词： state hyperbolic topological

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

折叠波导行波管切断匹配的设计

引用

强激光与粒子束 2011年第2期23卷 445-448页

作者：巩华荣宫玉彬唐涛徐进王文祥电子科技大学物理电子学院大功率微波电真空器件技术重点实验室成都610054

利用电磁模拟软件,计算得到了H面渐变与E面渐变的楔形衰减器匹配效果,指出在相同渐变长度下,E面渐变匹配效果优于H面渐变。H面渐变衰减器反射主要来源于电场集中处,而E面渐变衰减器主要来源于渐变前部尖端处。在此基础上设计出了一种变... 详细信息

利用电磁模拟软件,计算得到了H面渐变与E面渐变的楔形衰减器匹配效果,指出在相同渐变长度下,E面渐变匹配效果优于H面渐变。H面渐变衰减器反射主要来源于电场集中处,而E面渐变衰减器主要来源于渐变前部尖端处。在此基础上设计出了一种变形的匹配衰减器,即在E面渐变衰减器渐变开始处向前延伸一块薄片。计算结果与测试结果表明:与H面渐变和E面渐变的楔形衰减器相比,所设计衰减器在近截止频率处的匹配效果得到了明显的改善。

关键词：行波管折叠波导切断匹配电压驻波比

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

106例卡波西样血管内皮瘤治疗方案探讨

引用

中华整形外科杂志 2020年第1期36卷 29-34页

作者：稂翠玲龚毓宾董长宪周粤闽河南大学淮河医院河南省细胞医学工程国际联合实验室开封475000 河南省人民医院血管瘤外科郑州450003

目的观察比较保守治疗、早期手术及晚期手术治疗卡波西样血管内皮瘤的效果。方法2004年1月至2016年12月河南省人民医院血管瘤外科收治106例卡波西样血管内皮瘤患者,男62例,女44例,年龄最小1 d,最大43岁,中位年龄94.5 d。根据治疗方式不... 详细信息

目的观察比较保守治疗、早期手术及晚期手术治疗卡波西样血管内皮瘤的效果。方法2004年1月至2016年12月河南省人民医院血管瘤外科收治106例卡波西样血管内皮瘤患者,男62例,女44例,年龄最小1 d,最大43岁,中位年龄94.5 d。根据治疗方式不同分为保守治疗组29例、早期手术组55例和晚期手术组22例,保守治疗组采用激素或激素联合尿素局部注射治疗;手术治疗组行手术切除瘤体,发病至手术时间<3个月为早期手术组,≥3个月为晚期手术组。疗效评定标准:治愈为瘤体消失或基本消失,血小板恢复正常,随访半年以上无复发;有效为瘤体显著缩小,血小板明显回升;无效为瘤体无缩小或继续增大,血小板无回升或继续下降。比较3组治疗后的总疗效,比较治疗前及治疗后1、7、14 d患者血小板值的变化;比较早期手术组、晚期手术组术中及术后情况。结果患者均获6~23个月随访,治愈65例,有效24例,无效12例,死亡5例。治疗7 d后3组血小板值分别为保守治疗组68(31,157)×10^9/L、早期手术组(294.75±150.59)×10^9/L、晚期手术组(221.48±148.71)×10^9/L,组间比较差异有统计学意义(P<0.05);治疗14 d后3组血小板值分别为保守治疗组78(25.5,154.5)×10^9/L、早期手术组281(234,356)×10^9/L、晚期手术组(219.67±140.95)×10^9/L,组间比较差异有统计学意义(P<0.05)。随访至少半年后3组临床疗效总有效率:保守治疗组62.07%、早期手术组96.34%、晚期手术组81.82%,两两比较差异有统计学意义(P<0.05)。早期手术组术中出血量与手术时间、术后血小板值升高时间以及总住院时间与晚期手术组比较,差异均有统计学意义(P<0.05)。结论早期手术治疗卡波西样血管内皮瘤优于晚期手术治疗和保守治疗,手术应作为治疗卡波西样血管内皮瘤首选方案,应早发现早治疗。

关键词：卡波西样血管内皮瘤临床分析治疗方案

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

基于GOA-SVM的短期负荷预测

引用

电测与仪表 2019年第14期56卷 12-16页

作者：宫毓斌滕欢四川大学电气信息学院

支持向量机是借助于凸优化技术的统计学习方法,与传统神经网络相比,泛化错误率低并且结果易于解释。将支持向量机用于负荷预测时,参数选择不准确会导致预测性能较差。提出一种基于蚱蜢优化算法的支持向量机短期负荷预测方法,以某地区负... 详细信息

支持向量机是借助于凸优化技术的统计学习方法,与传统神经网络相比,泛化错误率低并且结果易于解释。将支持向量机用于负荷预测时,参数选择不准确会导致预测性能较差。提出一种基于蚱蜢优化算法的支持向量机短期负荷预测方法,以某地区负荷、天气等历史数据对SVM进行训练,并通过GOA优化选取支持向量机参数,然后以得到的最优参数建立GOA-SVM负荷预测模型。算例分析表明,GOA-SVM预测模型比GA-SVM和PSO-SVM模型有更好的收敛性能,且预测精度更高。

关键词：短期负荷预测支持向量机蚱蜢优化算法

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：