检索结果-南通市图书馆

Self-induced birefringence of white-light continuum generated by interaction of focused femtosecond laser pulses with fused silica

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2020年第2期8卷 71-76页

作者： J.qian G.D.Wang K.y.Lou D.y.Shen q.fu q.Z.Zhao State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

White-light continuum can be induced by the interaction of intense femtosecond laser pulses with condensed *** using two orthogonal polarizers,a self-induced birefringence of continuum is observed when focusing femtosecond laser pulses into bulk fused *** is,the generated white-light continuum is synchronously modulated anisotropically while propagating in fused ***-resolved detection confirms that self-induced birefringence of continuum shows a growth and saturation feature with time *** adjusting laser energy,the transmitted intensity of continuum modulated by self-induced birefringence also varies *** analysis with time evolution indicates that it is the focused femtosecond laser pulses that induce anisotropic microstructures in bulk fused silica,and the anisotropic structures at the same time modulate the generated continuum.

关键词： femtosecond laser pulses fused silica self-induced birefringence white-light continuum

Rational design of AgGaS/ZnS/ZnS quantum dots with a near-unity photoluminescence quantum yield via double shelling scheme

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第2期169卷 235-242页

作者： H.X.Lu H.Liu Z.Z.fu y.y.Chen H.q.Dai Z.Hu W.L.Zhang R.q.Guo Institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China Institute of future Lighting Academy for Engineering and TechnologyFudan UniversityShanghai 200433China yiwu Research Institute of fudan University YiwuZhejiang 322000China Zhongshan-fudan Joint Innovation Center Zhongshan 528437China

In this study,a two-step method was used to synthesize highly luminescent AgGaS/ZnS/ZnS quantum dots(qDs).In the first step,an inner ZnS shell was formed via a one-pot method,which resulted in a smaller lattice mismatch between the AgGaS core and the outer ZnS shell,thereby facilitating the formation of a thick outer *** the two-step shelling process,the synthesized AgGaS/ZnS/ZnS qDs showed an excellent photoluminescence quantum yield(PLqy)of 96.4%with a peak wavelength of 508 nm,repre-senting the highest PLqy reported thus far for AgGaS ***,the effect of halogen ions in Zn precursors on the shelling process was *** was proposed that the capacity of halogen ions to coordinate with the qDs influenced the balance between Zn cation diffusion and ZnS shelling ***,the ZnS shelling reaction was dominant when ZnCl_(2)was employed,while Zn cation diffusion was the dominant process under the I^(−)-rich *** work provides insights into the interfacial restructuring during the ZnS shelling and offers a clear map for the tailored synthesis of core/shell qDs.

关键词： AgGaS quantum dots Photoluminescence Core/shell Alloyed core/shell interface

A Theoretical Approach for Estimating Fracture Toughness of Ductile Metals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

上海交通大学学报 2004年第Z2期38卷 114-119页

作者： y.T. He F. Li G.q. Zhang L.J. Ernst X.J. fu College of Aeronautics University of Air Force Engineering Xi''an 710038 China College of Aeronautics Northwestern Polytechnical University Xi''an710072 China College of Aeronautics University of Air Force Engineering Xi''an 710038 China Philips Centre for Industrial Technology P.O.Box 218 5600 MD Eindhoven The Netherlands Delft University of Technology 2628 CD Delft The Netherlands College of Aeronautics Northwestern Polytechnical University Xi''an 710072 China

Fracture toughness is very important when applying Damage Tolerance Design and Assessment Techniques. The traditional testing approach for obtaining fracture toughness values is costly and time consuming. In order to estimate the fracture toughness of ductile metals, the fracture mechanics theory, materials plastic deformation theory and materials constructive relationships are employed here. A series of formulae and a theoretical approach are presented to calculate fracture toughness values of different materials in the plane stress and plane strain conditions. Compared with test results, evaluated values have a good agreement.

关键词： fracture toughness testing approach evaluated method fracture mechanics theory plastic deformation theory materials constructive relationship theoretical approach

Variational Corner Transfer Matrix Renormalization Group Method for Classical Statistical Models

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2022年第6期39卷 65-70页

作者： X.F.Liu y.F.fu W.q.yu J.F.yu Z.y.Xie Department of Physics Renmin University of ChinaBeijing 100872China School of Physics and Electronics Hunan UniversityChangsha 410082China

In the context of tensor network states,we for the first time reformulate the corner transfer matrix renormalization group(CTMRG)method into a variational bilevel optimization *** solution of the optimization problem corresponds to the fixed-point environment pursued in the conventional CTMRG method,from which the partition function of a classical statistical model,represented by an infinite tensor network,can be efficiently *** validity of this variational idea is demonstrated by the high-precision calculation of the residual entropy of the dimer model,and is further verified by investigating several typical phase transitions in classical spin models,where the obtained critical points and critical exponents all agree with the best known results in *** extension to three-dimensional tensor networks or quantum lattice models is straightforward,as also discussed briefly.

关键词： tensor variational straight

Isospin dependence of the nuclear binding energy

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2021年第1期45卷 272-279页

作者： y.q.He J.K.Ge G.J.fu H.Jiang School of Physics Science and Engineering Tongji UniversityShanghai 200092China School of Arts and Sciences Shanghai Maritime UniversityShanghai 201306China

In this paper,we study the symmetry energy and the Wigner energy in the binding energy formula for atomic *** simultaneously extract the I2 symmetry energy and Wigner energy coefficients using the double difference of "experimental" symmetry-Wigner energies,based on the binding energy data of nuclei with A≥*** study of the triple difference formula and the "experimental" symmetry-Wigner energy suggests that the macroscopic isospin dependence of binding energies is explained well by the I2 symmetry energy and the Wigner energy,and further consideration of the I4 term in the binding energy formula does not substantially improve the calculation result.

关键词： symmetry energy i^4 term Wigner energy nuclear binding energy

On recommendation-aware content caching for 6G:An artificial intelligence and optimization empowered paradigm

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2020年第3期6卷 304-311页

作者： yaru fu Khai Nguyen Doan Tony q.S.quek The School of Science and Technology The Open University of Hong Kong(OUHK)KowloonHong KongChina Information Systems Technology and Design Singapore University of Technology and Design487372Singapore

Recommendation-aware Content Caching(RCC)at the edge enables a significant reduction of the network latency and the backhaul load,thereby invigorating ubiquitous latency-sensitive innovative ***,the effectiveness of RCC strategies is highly dependent on explicit information as regards subscribers’content request patterns,the sophisticated caching placement policy,and the personalized recommendation *** this article,we investigate how the potentials of Artificial Intelligence(AI)and optimization techniques can be harnessed to address those core issues and facilitate the full implementation of RCC for the upcoming intelligent 6G *** this end,we first elaborate on the hierarchical RCC network ***,the devised AI and optimization empowered paradigm is introduced,whereas AI and optimization techniques are leveraged to predict the users’content preferences in real-time situations with the assistance of their historical behavior data and determine the cache pushing and recommendation decision,*** extensive case studies,we validate the effectiveness of AI-based predictors in estimating users’content preference and the superiority of optimized RCC policies over the conventional *** last,we shed light on the opportunities and challenges in the future.

关键词： Artificial intelligence Content caching Optimization techniques Recommendation 6G

Colletotrichum species associated with cultivated citrus in China

在线全文

学校读者我要写书评

暂无评论

fungal Diversity 2013年第4期61卷 61-74页

作者： F.Huang G.q.Chen X.Hou y.S.fu L.Cai K.D.Hyde H.y.Li Institute of Biotechnology Zhejiang UniversityHangzhou 310058China State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China Institute of Excellence in fungal Research Mae Fah Luang UniversityChiang Rai 57100Thailand

There have been considerable advances in the understanding of species concepts in the genus *** has lead to the need to carry out fresh surveys of Colletotrichum species associated with important *** species are associated with Citrus plants as saprobes,important pre-harvest and post-harvest pathogens,as well as *** this study,a total of 312 Colletotrichum strains were isolated from leaves,shoots and fruits of cultivated Citrus and Fortunella species with or without disease symptoms across the main citrus production areas in *** morphology of all strains were studied and multilocus(ACT,TUB2,CAL,GAPDH,GS,ITS)phylogeny *** were from four important species complexes of Colletotrichum,namely *** species complex,*** species complex,*** species complex and a final group including ***,which was rare on Citrus *** species belonging to the *** species complex comprised *** porioides and ***,the *** complex comprised *** and a new species *** and the *** complex included a new species,*** ability of strains to cause anthracnose on citrus fruits was tested by inoculation and strains of Colletotrichum gloeosporioides,*** and *** were pathogenic.

关键词： Citrus industry Citrus diseases Anthracnose Colletotrichum gloeosporioides Colletotrichum acutatum Colletotrichum boninense Morphology Phylogenetic analysis

A Model of Tangential Contact Damping Considering Asperity Interaction and Lateral Contact

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2018年第6期31卷 758-774页

作者： W.P.fu Z.q.Gao W.Wang J.B.Wu School of Mechanical and Precision Instrument Engineering Xi'an University of TechnologyXi'an 710048 China

A precise tangential contact damping model is proposed,which includes the lateral contact of the upper-lower asperities and the interaction of adjacent *** effects of the normal static preload,frequency,and amplitude of tangential displacement on the tangential contact damping were analyzed by simulation,***,the results of simulation are verified by *** tangential contact damping of considering the interaction and lateral contact of asperity is very close to the experimental results.

关键词： Asperity Lateral contact Interaction Tangential contact damping

Evaluation of Burden Descent Model for Burden Distribution in Blast furnace

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第8期23卷 765-771页

作者： Ping ZHOU Peng-yu SHI yan-po SONG Kai-le TANG Dong fu Chenn q.ZHOU School of Energy Science and Engineering Central South University Center for Innovation through Visualization and Simulation Purdue University Calumet

Mathematical models for burden descending process have been applied to obtain whole burden structures in blast furnace,whereas the accuracy of those burden descent models has not been sufficiently *** evaluation method based on timeline burden profiles was established to quantitatively evaluate the error between experimental and modeled burden *** existing burden descent models were utilized to describe the burden structure of a 1/20 scaled warm blast *** modeling conditions including initial burden profile,descending volumes in each time interval,and normalized descending velocity distribution were determined via special image processing *** burden structures were evaluated combined with the published experimental *** is found that all the models caught the main profile of the burden ***,the improved nonuniform descent model（Model IV）shows the highest level of precision especially when burden descends with unstable velocity distribution ***,the traditional nonuniform descent model（Model III）may also be desirable to model the burden descending process when the burden descending velocity presents a linear ***,the uniform descent model（Model I）might be the first option for roughly predicting burden structure.

关键词： burden descending descent normalized utilized scaled sufficiently modeled desirable quantitatively