检索结果-南通市图书馆

Multi-prior physics-enhanced neural network enables pixel super-resolution and twin-imagefree phase retrieval from single-shot hologram

在线全文

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2024年第9期7卷 22-38页

作者： Xuan Tian Runze Li tong peng Yuge Xue Junwei Min Xing Li Chen Bai Baoli Yao State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China.

Digital in-line holographic microscopy(DIHM)is a widely used interference technique for real-time reconstruction of living cells’morphological information with large space-bandwidth product and compact ***,the need for a larger pixel size of detector to improve imaging photosensitivity,field-of-view,and signal-to-noise ratio often leads to the loss of sub-pixel information and limited pixel ***,the twin-image appearing in the reconstruction severely degrades the quality of the reconstructed *** deep learning(DL)approach has emerged as a powerful tool for phase retrieval in DIHM,effectively addressing these ***,most DL-based strategies are datadriven or end-to-end net approaches,suffering from excessive data dependency and limited generalization ***,a novel multi-prior physics-enhanced neural network with pixel super-resolution(MPPN-PSR)for phase retrieval of DIHM is *** encapsulates the physical model prior,sparsity prior and deep image prior in an untrained deep neural *** effectiveness and feasibility of MPPN-PSR are demonstrated by comparing it with other traditional and learning-based phase retrieval *** the capabilities of pixel super-resolution,twin-image elimination and high-throughput jointly from a single-shot intensity measurement,the proposed DIHM approach is expected to be widely adopted in biomedical workflow and industrial measurement.

关键词： optical microscopy quantitative phase imaging digital holographic microscopy deep learning super-resolution

Giant reversible barocaloric effects with high thermal cycle stability in epoxybonded(MnCoGe)_(0.96)(CuCoSn)_(0.04) composite

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

International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2528-2534页

作者： Yafei Kuang Kun Tao Bo Yang peng tong Yan Zhang Zhigang Sun Kewei Zhang Dunhui Wang Jifan Hu Liang Zuo College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Shanxi Key Laboratory of Magnetic and Electric Functional Materials and Applications Taiyuan University of Science and TechnologyTaiyuan 030024China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China School of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China

Hexagonal MnMX-based(M=Co or Ni,X=Si or Ge)alloys exhibit giant reversible barocaloric ***,giant volume expansion would result in the as-cast MnMX ingots fragmenting into powders,and inevitably bring the deterioration of mechanical properties and *** fragmentation can bring degradation of structural transformation entropy change during cyclic application and removal of *** this paper,giant reversible barocaloric effects with high thermal cycle stability can be achieved in the epoxy bonded(MnCoGe)0.96(CuCoSn)0.04 *** reversible isothermal entropy change of 43.0 J·kg^(−1)·K^(−1) and adiabatic temperature change from barocaloric effects(ΔT_(BCE))of 15.6 K can be obtained within a wide temperature span of 30 K at 360 MPa,which is mainly attributed to the integration of the change in the transition temperature driven by pressure of−101 K·GPa^(−1) and suitable thermal hysteresis of 11.1 ***,the variation of reversibleΔ_(TBCE) against the applied hydrostatic pressure reaches up to 43 K·GPa^(−1),which is at the highest level among the other reported giant barocaloric *** importantly,after 60 thermal cycles,the composite does not break and the calorimetric curves coincide well,demonstrating good thermal cycle stability.

关键词： barocaloric effects cycle stability reversible isothermal entropy change reversible adiabatic temperature change MnCoGe alloys

Molecular phylogenetic relationships based on mitochondrial genomes of novel deep-sea corals(Octocorallia:Alcyonacea):Insights into slow evolution and adaptation to extreme deep-sea environments

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2024年第1期45卷 215-225页

作者： Zhan-Fei Wei Kai-Wen Ta Nan-Nan Zhang Shan-Shan Liu Liang Meng Kai-Qiang Liu Chong-Yang Cai Xiao-tong peng Chang-Wei Shao National Key Laboratory of Mariculture Biobreeding and Sustainable Goods Yellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdaoShandong 266071China BGI-Qingdao BGI-ShenzhenQingdaoShandong 266555China Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanyaHainan 572000China

A total of 10 specimens of Alcyonacea corals were collected at depths ranging from 905 m to 1633 m by the manned submersible Shenhai Yongshi during two cruises in the South China Sea(SCS).Based on mitochondrial genomic characteristics,morphological examination,and sclerite scanning electron microscopy,the samples were categorized into four suborders(Calcaxonia,Holaxonia,Scleraxonia,and Stolonifera),and identified as 9 possible new cold-water coral *** of GC-skew dissimilarity,phylogenetic distance,and average nucleotide identity(ANI)revealed a slow evolutionary rate for the octocoral mitochondrial *** nonsynonymous(Ka)to synonymous(Ks)substitution ratio(Ka/Ks)suggested that the 14 protein-coding genes(PCGs)were under purifying selection,likely due to specific deep-sea environmental *** analysis of the median Ka/Ks values of five gene families and environmental factors indicated that the genes encoding cytochrome b(cyt b)and DNA mismatch repair protein(mutS)may be influenced by environmental factors in the context of deep-sea species *** study highlights the slow evolutionary pace and adaptive mechanisms of deep-sea corals.

关键词： Mitochondrial genome Alcyonacea Ka/Ks evolution Environmental factors

超声引导双侧腹横肌平面神经阻滞联合全麻对腹腔镜子宫切除术患者的应用

在线全文

学校读者我要写书评

暂无评论

西藏医药 2024年第4期45卷 37-39页

作者：彭通南充市中心医院/北京安贞医院南充医院麻醉科四川南充637000

目的目的观察超声引导双侧腹横肌平面神经阻滞联合全麻对腹腔镜子宫切除术患者的应用效果。方法方法选取2021年7月~2023年7月本院接受腹腔镜子宫切除手术患者120例。按照麻醉方式分为对照组(65例)与观察组(55例),对照组行单纯全身麻醉,... 详细信息

目的目的观察超声引导双侧腹横肌平面神经阻滞联合全麻对腹腔镜子宫切除术患者的应用效果。方法方法选取2021年7月~2023年7月本院接受腹腔镜子宫切除手术患者120例。按照麻醉方式分为对照组(65例)与观察组(55例),对照组行单纯全身麻醉,观察组在对照组基础上行超声引导双侧腹横肌平面神经阻滞。对比两组入麻醉室(T0)、麻醉诱导开始(T1)、气管插管时(T2)、手术开始时(T3)、手术结束时(T4)应激反应、血流动力学指标及麻醉质量。结果两组应激反应及血流动力学指标在T0、T1、T2时期比较无明显差异(P>0.05),T3、T4时期观察组应激反应及血流动力学指标低于对照组(P<0.05);观察组麻醉质量优于对照组(P<0.05)。结论结论超声引导双侧腹横肌平面神经阻滞联合全麻对腹腔镜子宫切除术患者的应激反应及血流动力学指标影响较低,同时麻醉质量较优。

关键词：超声引导双侧腹横肌平面神经阻滞腹腔镜子宫切除术

在线全文

学校读者我要写书评

暂无评论

基于电力客户画像的电费风险防控

山西财经大学学报 2024年第S1期46卷 184-186页

作者：尚尔媛佟鹏吴昊国网内蒙古东部电力有限公司供电服务监管与支持中心内蒙古通辽028000

在当前快速的经济环境中,行业用电和客户用电需求的改变促使电力公司进行变革或创新,以为消费者带来最佳的客户体验。为了有效地降低“一户一策”中提出的电费风险,国网公司计划建立一套完善的电费风险评估和防控管理体系,以便及时发现... 详细信息

在当前快速的经济环境中,行业用电和客户用电需求的改变促使电力公司进行变革或创新,以为消费者带来最佳的客户体验。为了有效地降低“一户一策”中提出的电费风险,国网公司计划建立一套完善的电费风险评估和防控管理体系,以便及时发现和预测客户的电费风险,并有效地控制和减少此类风险,实现更加有序、有力的电费管理。本文通过构建电费风险防控及信用评估智能算法来推进电力客户分类信用管理,并辅助电费风险防控应用工作的开展。

关键词：电力客户电费风险防控

医用电子直线加速器迷路设计蒙特卡罗模拟分析

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国辐射卫生 2024年第3期33卷 248-253,272页

作者：佟鹏侯长松陆见霏朱卫国中国疾病预防控制中心辐射防护与核安全医学所、辐射防护与核应急中国疾病预防控制中心重点实验室北京100088

目的分析医用电子直线加速器不同迷宫结构对机房门口辐射水平的影响。方法采用蒙特卡罗模拟方法,对比了2种不同迷宫宽度的加速器机房辐射场分布,并对辐射水平进行分析。结果迷路宽大的加速器机房门口的辐射水平明显高于迷路紧凑的加速... 详细信息

目的分析医用电子直线加速器不同迷宫结构对机房门口辐射水平的影响。方法采用蒙特卡罗模拟方法,对比了2种不同迷宫宽度的加速器机房辐射场分布,并对辐射水平进行分析。结果迷路宽大的加速器机房门口的辐射水平明显高于迷路紧凑的加速器机房门口的辐射水平,窄迷路模型机房门口的中子辐射水平相较宽迷路模型下降了38.6%,X射线辐射水平也有下降的趋势。结论在设计医用电子直线加速器时,应采用紧凑的迷宫结构,以减少无效空间设置,从而降低机房门口的辐射水平,提高辐射防护效果。

关键词：放射治疗迷路设计辐射防护

First order sea clutter cross section for bistatic shipborne HFSWR

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2017年第4期28卷 681-689页

作者： Yongpeng Zhu Yinsheng Wei peng tong School of Electronics and Information Engineering Harbin Institute of Technology Harbin 150001 China

This paper studies the development on the first order sea clutter cross section for bistatic high frequency surface wave radar (HFSWR). Based on the received first order electric field expression, a closed-form of cross sections is derived to account for the case of receiving antenna array being mounted on the shipborne platform. The uniform linear motion and sway motion components are assumed to be responsible for the observed differences in comparison with the bistatic fixed antenna case. Correspondingly, simulations are conducted to study the sea clutter spectral characteristics for these two cases versus different system parameters and sea state conditions. It is shown numerically that the forward motion component will spread the Bragg lines severely and the influence triggered by the sway motion can be explained as the Bessel function modulation of the ordinary sea clutter spectra. The obtained results have important implications in the application of shipborne HFSWR technology to ocean remote sensing and target detection.

关键词： radar cross section (RCS) remote sensing by radar sea clutter high frequency surface wave radar (HFSWR)

在线全文

学校读者我要写书评

暂无评论

蛇纹石化环境非生物成因固态碳质物研究

矿物岩石地球化学通报 2024年第1期43卷 232-239页

作者：佟宏鹏张葚陈琳莹谭文汐陈多福上海海洋大学海洋科学与生态环境学院/极端海洋过程与资源研究中心上海201306 上海市深渊生物圈前沿科学研究基地上海201306

超基性岩的蛇纹石化是一种广泛存在的地质过程,在蛇纹石化环境中无机碳可以通过化合形成甲烷等非生物成因有机物,为化能自养生物提供初始能量。近年来,超基性岩及蛇纹岩中发现了固态碳质物(condensed carbonaceous matter,CCM),其中包... 详细信息

超基性岩的蛇纹石化是一种广泛存在的地质过程,在蛇纹石化环境中无机碳可以通过化合形成甲烷等非生物成因有机物,为化能自养生物提供初始能量。近年来,超基性岩及蛇纹岩中发现了固态碳质物(condensed carbonaceous matter,CCM),其中包含无机成因的复杂有机物,可能反映其在生命起源过程中扮演了重要角色。本文介绍了蛇纹石化过程形成的固态碳质物(CCM)的定义、发现过程及赋存特征,并对其形成机制、形成环境的制约因素、无机来源判别等进行了讨论。固态碳质物的形成可能与超基性岩蛇纹石化作用及费托反应有关。它常与铁氧化物或皂石等特定矿物形成共生组合关系,这不仅是其无机化合成因的证据,同时也证明了特定矿物对固态碳质物产生的催化作用。此外,流体中的H_(2)和CO_(2)的比例也会影响固态碳质物的化学组成,纳米孔隙被认为有利于其形成。但是,固态碳质物具体的形成过程及其与甲烷等无机成因简单有机物的相互关系目前尚不清楚,这应是今后的一个重要研究方向。

关键词：固态碳质物非生物成因有机物蛇纹石化作用费托反应

人参皂苷F1干预SREBP2/HMGCR通路抑制氧化损伤细胞的胆固醇过载

在线全文

学校读者我要写书评

暂无评论

卫生研究 2024年第1期53卷 60-65页

作者：刘迪张喆彭彤于子翔孙洁孔繁利冯宪敏吉林医药学院基础医学院吉林132013 北华大学医学技术学院吉林132013

目的研究人参皂苷F1对H_(2)O_(2)诱导的HepG2细胞胆固醇代谢紊乱在其抗氧化应激中的作用机制。方法通过1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)和氧化自由基吸收能力(oxygen radical absorbance capacity,ORAC)试验检测人参皂苷F1对氮氧自由基的清除作用,以400μmol/L H_(2)O_(2)诱导HepG2细胞氧化损伤,10、20和40μmol/L人参皂苷F1预处理,通过线粒体膜电位检测试剂盒(JC-1法)和胆固醇试剂盒分别检测线粒体膜电位和细胞总胆固醇水平,并采用蛋白印迹法检测胆固醇合成通路中胆固醇调节元件结合蛋白2(sterol-regulatory element binding proteins,SREBP2)和3-羟基-3-甲基戊二酸单酰辅酶A还原酶(3-hydroxy-3-methylglutaryl coenzyme A reductase,HMGCR)的蛋白表达量变化。结果人参皂苷F1的DPPH清除率较低,远低于水溶性维生素E(6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid,Trolox),但人参皂苷F1的ORAC能力较强,与Trolox相当;H_(2)O_(2)损伤细胞后,线粒体膜电位下降,SREBP2蛋白表达量显著下调(P<0.05),胆固醇水平上升、HMGCR的蛋白表达显著上调(P<0.05),10、20和40μmol/L人参皂苷F1预处理损伤细胞后,线粒体膜电位较损伤组显著提高(P<0.05),中高浓度组SREBP2蛋白表达量显著上调(P<0.05),胆固醇水平下降、HMGCR的蛋白表达显著下调(P<0.05)。结论人参皂苷F1能通过抑制氧自由基、保护线粒体抵抗H_(2)O_(2)诱导的HepG2细胞氧化应激,其作用机制可能与干预SREBP2/HMGCR通路调控细胞胆固醇合成代谢有关。

关键词：人参皂苷F1 氧化损伤胆固醇胆固醇调节元件结合蛋白2 3-羟基-3-甲基戊二酸单酰辅酶A还原酶 SREBP2 HMGCR