检索结果-南通市图书馆

Measurement of Random Surface Parameters of Weak Scatterers using the Speckle Contrast Method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2002年第9期19卷 1283-1286页

作者： CHENG chuan-Fu LIU Chun-xiang TENG Shu-yun Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Department of Physics Shandong Normal University Ji"nan 00 Shandong Institute of Architecture

Theoretical analysis shows that the deviation roughness w and lateral correlation length ξ of a weak scattering object determine the different properties of the contrast of the speckles in the image plane of a 4f system. Experimentally, we have measured the data of the speckle contrast versus the radius R of the variable filtering aperture. By fitting the theoretical results to these data, the parameters w and ξ of the random surfaces with Gaussian correlation are extracted. This method can determine the two parameters simultaneously and independently, and pre-calibrations are not needed.

关键词： Speckle

An Augmented Lagrangian based Semismooth Newton Method for a Class of Bilinear Programming Problems

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

Applied Mathematics(A Journal of Chinese Universities) 2019年第4期34卷 446-459页

作者： HE Su-xiang LIU Yan WANG chuan-mei School of Science Wuhan University of Technology

This paper proposes a semismooth Newton method for a class of bilinear programming problems(BLPs)based on the augmented Lagrangian,in which the BLPs are reformulated as a system of nonlinear equations with original variables and Lagrange *** strict complementarity,the convergence of the method is studied by means of theories of semismooth analysis under the linear independence constraint qualification and strong second order sufficient *** last,numerical results are reported to show the performance of the proposed method.

关键词： semismooth Newton method constrained bilinear programming problems augmented Lagrangian strict complementarity

Evaluation of hadronic emission in starburst galaxies and star-forming galaxies

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第10期21卷 221-230页

作者： Yun-chuan xiang Ze-Jun Jiang Yun-Yong tang Department of Astronomy Yunnan Universityand Key Laboratory of Astroparticle Physics of Yunnan ProvinceKunming 650091China School of Physical Science and Technology Kunming UniversityKunming 650214China

In this work,we reanalyzed 11 years of spectral data from the Fermi Large Area Telescope(Fermi-LAT)of currently observed starburst galaxies(SBGs)and star-forming galaxies(SFGs).We used a one-zone model provided by NAIMA and the hadronic origin to explain the GeV observation data of the SBGs and *** found that a protonic distribution of a power-law form with an exponential cutoff can explain the spectra of most SBGs and ***,it cannot explain the spectral hardening components of NGC 1068 and NGC 4945 in the GeV energy ***,we considered the two-zone model to well explain these *** summarized the features of two model parameters,including the spectral index,cutoff energy,and proton energy *** to the evolution of supernova remnants(SNRs)in the Milky Way,we estimated the protonic acceleration limitation inside the SBGs to be the order of 10^(2) TeV using the one-zone model;this is close to those of SNRs in the Milky Way.

关键词： galaxies:starburst galaxies:star formation gamma rays:galaxies radiation mechanisms:non-thermal

Flow field fusion simulation method based on model features and its application in CRDM

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第3期33卷 89-102页

作者： Si-Tong Ling Wen-Qiang Li chuan-Xiao Li Hai xiang School of Mechanical Engineering Sichuan UniversityChengdu 610065China Innovation Method and Creative Design Key Laboratory of Sichuan Province Chengdu 610065China

The control rod drive mechanism(CRDM)is an essential part of the control and safety protection system of pressurized water *** CRDM simulations are mostly performed collectively using a single method,ignoring the influence of multiple motion units and the differences in various features among them,which strongly affect the efficiency and accuracy of the *** this study,we constructed a flow field fusion simulation method based on model features by combining key motion unit analysis and various simulation methods and then applied the method to the CRDM simulation *** performs motion unit decomposition through the structural hierarchy of function-movement-action method,and the key meta-actions are identified as the nodes in the flow field *** established a fused feature-based multimethod simulation process and processed the simulation methods and data according to the features of the fluid domain space and the structural complexity to obtain the fusion simulation *** to traditional simulation methods and real measurements,the simulation method provides advantages in terms of simulation efficiency and accuracy.

关键词： CRDM Flow field simulation Motion unit analysis Simulation method fusion

The likely counterpart to γ-ray excess from the northwest region of Arp 220

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第7期21卷 171-176页

作者： Yun-chuan xiang Jun-Hao Deng Ze-Jun Jiang Department of Astronomy Yunnan Universityand Key Laboratory of Astroparticle Physics of Yunnan ProvinceKunming 650091China

The unknown γ-ray excess in the northwest region of Arp 220 was revisited by analyzing~11.8 years of the Fermi Large Area Telescope(Fermi-LAT) data in this *** found that its photon flux was approximately three times higher than that of the previous study in the 0.2-100 GeV band,and the corresponding significance level ~8.15σ was approximately four times higher than *** light curves of 15 and 45 time bins from the whole time all showed two active periods,and the variability of the second period was more significant than that of the first *** spectral indices from the two active periods were not statistically different and were close to the range of γ-ray flat-spectrum radio quasars observed by *** the position of CRATES J153246+234400 was consistent with the best-fit position of our analysis,we suggest that CRATES J153246+234400 is more likely a γ-ray counterpart for the variational *** Arp 220,there was no significant variability in the γ-ray emission.

关键词： flat spectrum radio quasar:individual(CRATES J153246+234400) quasars γ-ray emission

Optical Bistability in Ag/Dielectric Multilayers

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第5期29卷 100-103页

作者： LI Heng SHENG chuan-xiang CHEN Qian School of Electronic Engineering and Optoelectronics Technology Nanjing University of Science and TechnologyNanjing 210094

We numerically study the optical bistability (OBIS) in periodic multilayers of Ag/SiO_(2).The calculated dependence of the output on the input intensity shows two possible OBIS states at the test *** is due to the field localization effects in silver layers with nonlinear refractive index modifying resonant tunneling of electromagnetic waves;the other,with about a three times lower threshold input intensity,is attributed to the intensity dependence change of the Ag/SiO_(2) composite's effective dielectric constant from metallic-like (negative) to dielectric-like (positive).With appropriate design engineering the Ag/SiO2 multilayers could find broad applications in all-optical information processes.

关键词： composite intensity dielectric

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

页岩气钻前工程装配式场面板理论计算研究

武汉理工大学学报 2024年第4期46卷 89-96页

作者：张宇迪文华谭树成赵云川刘颖李祥西南科技大学土木工程与建筑学院绵阳621010 四川蜀渝石油建筑安装工程有限责任公司成都610056

通过倒梁法得到装配式场面板面层配筋,通过板底脱空现象简化受力模型,得到装配式场面板底层配筋。通过多个钻前工程实际应用表明,装配式场面板满足钻前工程场坪的设计规范要求和实际使用需求,综合考虑面板拼装时间与施工难易程度、场坪... 详细信息

通过倒梁法得到装配式场面板面层配筋,通过板底脱空现象简化受力模型,得到装配式场面板底层配筋。通过多个钻前工程实际应用表明,装配式场面板满足钻前工程场坪的设计规范要求和实际使用需求,综合考虑面板拼装时间与施工难易程度、场坪结构承载力要求、周转运输、材料成本等方面,推荐装配式场面板尺寸为3 m×1.5 m×0.15 m,板面层配筋面积为302 mm^(2);板底层配筋面积为1 278 mm^(2),最大程度保证钻前工程装配式场面板的使用性和适用性。

关键词：页岩气钻前工程装配式场面板理论计算倒梁法

在线全文

学校读者我要写书评

暂无评论

水凝胶多场耦合计算力学

计算力学学报 2024年第1期41卷 91-100页

作者：杨庆生刘夏粘向川宗婷乔海棣金山唐爱杰北京工业大学工程力学系北京100124

作为一种具有多场耦合特性的智能柔体材料,水凝胶的制备技术、性能表征与结构应用得到迅速发展。本文在分析水凝胶本构理论和结构设计的基础上,提出了水凝胶多场耦合计算力学的基本方法和范式,包括微观粗粒化分子动力学模拟和宏观耦合... 详细信息

作为一种具有多场耦合特性的智能柔体材料,水凝胶的制备技术、性能表征与结构应用得到迅速发展。本文在分析水凝胶本构理论和结构设计的基础上,提出了水凝胶多场耦合计算力学的基本方法和范式,包括微观粗粒化分子动力学模拟和宏观耦合有限元方法等,计算了化学-力学耦合作用下水凝胶材料与结构的变形和应力,给出了多个数值算例与结果比较。研究指出多场耦合计算力学将成为水凝胶材料和结构分析的主要手段,并推动水凝胶等这类智柔材料的性能设计与工程应用。

关键词：水凝胶智能结构多场耦合计算力学多尺度

维普期刊数据库博看期刊

Fermatean Hesitant Fuzzy Prioritized Heronian Mean Operator and Its Application in Multi-Attribute Decision Making

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第5期75卷 3203-3222页

作者： chuan-Yang Ruan xiang-Jing Chen Li-Na Han School of Business Administration Guangdong University of Finance and EconomicsGuangzhou510320China Antai College of Economics and Management Shanghai Jiaotong UniversityShanghai 200030China Guangdong Institute of Scientific and Technical Information Guangzhou510033China

In real life,incomplete information,inaccurate data,and the preferences of decision-makers during qualitative judgment would impact the process of *** a technical instrument that can successfully handle uncertain information,Fermatean fuzzy sets have recently been used to solve the multi-attribute decision-making(MADM)*** paper proposes a Fermatean hesitant fuzzy information aggregation method to address the problem of fusion where the membership,non-membership,and priority are considered *** the Fermatean hesitant fuzzy sets with Heronian Mean operators,this paper proposes the Fermatean hesitant fuzzy Heronian mean(FHFHM)operator and the Fermatean hesitant fuzzyweighted Heronian mean(FHFWHM)***,considering the priority relationship between attributes is often easier to obtain than the weight of attributes,this paper defines a new Fermatean hesitant fuzzy prioritized Heronian mean operator(FHFPHM),and discusses its elegant properties such as idempotency,boundedness and monotonicity in ***,for problems with unknown weights and the Fermatean hesitant fuzzy information,aMADM approach based on prioritized attributes is proposed,which can effectively depict the correlation between attributes and avoid the influence of subjective factors on the ***,a numerical example of multi-sensor electronic surveillance is applied to verify the feasibility and validity of the method proposed in this paper.

关键词： Fermatean hesitant fuzzy set multi-attribute decision-making Heronian mean operator prioritized operator