检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Fan, Yu Cao, Jian Zhang, Jun Zhao, Yong Fang, Rongchao Wang, Yeqing Chen, Zheng School of Materials and Physics China University of Mining and Technology Xuzhou221116 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Xuzhou Construction Machinery Group Co. Ltd. Xuzhou221011 China Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang212003 China

Narrow gap oscillating laser welding with filler wire is a promising technique for joining high-strength steels in construction machinery. In order to investigate the influence of beam oscillation on the surface morphology and microstructure of weld joints of two types of commonly-used high-strength steels, a comparative study between oscillation welding and non-oscillation welding was conducted. High-speed photography technique was employed to reveal the microstructure and mechanical properties of the dissimilar joints. The results showed that laser beam oscillation produces two effects: one was to enlarge the heated surface of molten pool, while the other was to stir the liquid metal in molten pool periodically. Under the first effect, the fusion between sidewall and weld bead layers was promoted, while under the latter, coarse columnar grains ceased to appear, but finer grains were formed. The weld joints between Q355 and 35 steels exhibited excellent tensile impact bending performance, which was attributed to the grain refinement effect. The results also demonstrated that the oscillation welding with a contact angle less than 50° could avoid lack of fusion in multi-pass wire-filling laser welding. The influence of the oscillation welding process on the quality of welding was further discussed. © 2024, The Authors. All rights reserved.

关键词： Laser beam welding

来源：评论

学校读者我要写书评

暂无评论

Probing field-driven electron dynamics of gapped graphene by intensity-dependent valley polarization

引用

Physical Review A 2024年第6期109卷 063106-063106页

作者： Miao Yu Hongchuan Du Jia Tan Kunlong Liu Peixiang Lu Yueming Zhou School of Physics and Wuhan National Laboratory for Optoelectronics School of Nuclear Science and Technology Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and Technology School of Physical Sciences Great Bay University Dongguan 523000 China and Great Bay Institute for Advanced Study Dongguan 523000 China Optics Valley Laboratory Wuhan 430074 China

We investigate theoretically the laser intensity dependent valley polarization in gapped graphene driven by the circularly polarized pulse. The results show that the valley polarization without considering decoherence displays a nonmonotonic behavior as a function of the laser intensity. By analyzing the conduction-band electron distribution, we demonstrate that the decrease of the valley polarization in low laser intensity is caused by the change of dominant physical mechanisms, i.e., from few-photon to diabatic tunneling transitions. While in high laser intensity, the analysis of electron dynamics trajectories indicates that the intercycle interference determines the different k-resolved electron distributions in K and K′ valleys, influences the valley polarization, finally leads to the formation of a peak. Moreover, when the decoherence is considered, although the interference structure of the k-resolved electron distribution becomes blurred, the oscillation of valley polarization with the laser intensity is still present. Our work illustrates that the laser intensity can significantly influence the field-driven electron dynamics processes and can be as a knob to adjust the valley polarization in gapped graphene.

关键词： Electronic transitions Light-matter interaction Phase transitions

来源：评论

学校读者我要写书评

暂无评论

Unusual thermal properties of graphene origami crease:A molecular dynamics study

引用

Green Energy & Environment 2022年第1期7卷 86-94页

作者： Ning Wei Yang Chen Kun Cai Yingyan Zhang Qingxiang Pei Jin-Cheng Zheng Yiu-Wing Mai Junhua Zhao Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology Jiangnan UniversityWuxi214122China Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringShanghai UniversityShanghai200072China School of Engineering RMIT UniversityBundooraVIC3083Australia Institute of High Performance Computing A^(*)STAR138632Singapore Department of Physics and the Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Xiamen UniversityXiamen361005China Xiamen University Malaysia 439000SepangSelangorMalaysia Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic Engineering J07The University of SydneySydneyNSW2006Australia

Graphene is a two-dimensional material that can be folded into diverse and yet interesting nanostructures like macro-scale paper *** of graphene not only makes different morphological configurations but also modifies their mechanical and thermal *** by paper origami,herein we studied systemically the effects of creases,where sp^(2)to sp^(3)bond transformation occurs,on the thermal properties of graphene origami using molecular dynamics(MD)*** MD simulation results show that tensile strain reduces(not increases)the interfacial thermal resistance owing to the presence of the *** unusual phenomenon is explained by the micro-heat flux migration and stress *** findings on the graphene origami enable the design of the next-generation thermal management devices and flexible electronics with tuneable properties.

关键词： Graphene Origami Bond transformation Interfacial thermal resistance Molecular dynamics

来源：评论

学校读者我要写书评

暂无评论

A Superb Iron-Based Glassy-Crystal Alloy Fiber as an Ultrafast and Stable Catalyst for advanced Oxidation

引用

advanced Fiber Materials 2024年第5期6卷 1483-1494页

作者： Sida Jiang Guanyu Cao Zhe Jia Ligang Sun Chen Wang Hongbo Fan Yonghui Wang Weizhi Xu Yifan Cui Zhiliang Ning Jianfei Sun Jianhua Li Xiaobin Tang Heng Liang E.Peng National Key Laboratory of Space Environment and Matter Behaviors Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China School of Science Harbin Institute of TechnologyShenzhen 518055China School of Physics Harbin Institute of TechnologyHarbin 150001China Beijing Engineering Research Center of Detection and Application for Weak Magnetic Field Department of PhysicsUniversity of Science and TechnologyBeijingBeijing 100083China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150001China

Waterborne organic pollutants pose significant threats to ecosystems and the health of billions worldwide,presenting a pressing global *** oxidation processes(AOPs)offer promise for efficient wastewater treatment,yet the efficacy and the reliability of current environmental catalysts hinder their widespread *** study developed an as-cast nanostructured glassy fiber capable of rapidly activating persulfate and achieved the degradation of diverse organic contaminants within 60 s using the as-prepared *** material is relatively robust and can be reused about 40 *** exceptional catalytic performance of the fibers stemmed from their low atomic coordination numbers,which facilitated the generation of numerous unsaturated active sites and accelerated radical production rates through a one-electron transfer ***,the glassy-nanocrystalline heterogeneous interface,achieved through our proposed nanostructur-alization approach,exhibited electron delocalization *** enhanced persulfate adsorption and reduced the energy barrier for heterolytic cleavage of peroxy *** findings present a novel avenue for the rational structural design of high-performance environmental catalysts for advanced water remediation.

关键词： Glassy-crystal alloy Nanocrystallization Heterogeneous interface Atomic configuration Water remediation

来源：评论

学校读者我要写书评

暂无评论

Optimized blind equalization for probabilistically shaped high-order QAM signals

引用

Chinese Optics Letters 2022年第8期20卷 1-5页

作者： Fengchu Cao Mingyi Gao Pengfei Wang Xiaodi You Gangxiang Shen Jiangsu Engineering Research Center of Novel Optical Fiber Technology and Communication Network Suzhou Key Laboratory of Advanced Optical Communication Network TechnologySchool of Electronic and Information EngineeringSoochow UniversitySuzhou 215006China

Probabilistically shaped(PS)high-order quadrature amplitude modulation(QAM)signals are attractive to coherent optical communication due to increased spectral ***,standard digital signal processing algorithms are not optimal to demodulate PS high-order QAM ***,a compromise equalization is indispensable to compensate the residual ***,the performance of conventional blind equalization highly depends on the accurate amplitude radius and distribution of the *** PS high-order QAM signals make the issue worsen because of indistinct amplitude *** this work,we proposed an optimized blind equalization by utilizing a peak-density K-means clustering algorithm to accurately track the amplitude radius and *** experimentally demonstrated the proposed method in a PS 256-QAM coherent optical transmission system and achieved approximately 1 dB optical signal-to-noise ratio improvement at the bit error rate of 1×10^(−3).

关键词： coherent optical communication probabilistic shaping blind equalization

来源：评论

学校读者我要写书评

暂无评论

Hierarchically mesoporous carbon spheres coated with a single atomic Fe-N-C layer for balancing activity and mass transfer in fuel cells

引用

Carbon Energy 2022年第1期4卷 1-11页

作者： Chengyong Shu Qiang Tan Chengwei Deng Wei Du Zhuofan Gan Yan Liu Chao Fan Hui Jin Wei Tang Xiao-dong Yang Xiaohua Yang Yuping Wu School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'anChina State Key Laboratory for Mechanical Behavior of Materials School of Material Science and EngineeringXi'an Jiaotong UniversityXi'anChina State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power SourcesShanghaiChina State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'anChina College of Materials Science and Engineering Huaqiao UniversityXiamenChina Institute of Quantum and Sustainable Technology(IQST) School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiangChina State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering and Institute of Advanced MaterialsNanjing Tech UniversityNanjingChina

Novel cost-effective fuel cells have become more attractive due to the demands for rare and expensive platinum-group metal(PGM)catalysts for mitigating the sluggish kinetics of the oxygen reduction reaction(ORR).The high-cost PGM catalyst in fuel cells can be replaced by earth-abundant transition-metalbased catalysts,that is,an Fe-N-C catalyst,which is considered one of the most promising ***,the performance of the Fe-N-C catalyst is hindered by the low catalytic activity and poor stability,which is caused by insufficient active sites and the lack of optimization of the triple-phase interface for mass ***,a novel Fe–N–C catalyst consisting of mono-dispersed hierarchically mesoporous carbon sphere cores and single Fe atom-dispersed functional shells are *** synergistic effect between highly dispersed Fe-active sites and well-organized porous structures yields the combination of high ORR activity and high mass transfer *** half-wave potential of the catalyst in 0.1M H_(2)SO_(4) is 0.82 V versus reversible hydrogen electrode,and the peak power density is 812 mW·cm^(−2) in H_(2)–O_(2) fuel ***,it shows superior methanol tolerance,which is almost immune to methanol poisoning and generates up to 162 mW·cm^(−2) power density in direct methanol fuel cells.

关键词： fuel cell hierarchically mesoporous carbon spheres oxygen reduction reaction single‐atom catalysts

来源：评论

学校读者我要写书评

暂无评论

Efficient Characterization of Red Blood Cell Rheological Properties Using a Multichannel Microfluidic Chip and Optical Tweezers

SSRN

引用

SSRN 2024年

作者： Liu, Ying Rao, Hongtao Zhang, Hongliang Wang, Meng Wu, Yinglian Wu, Ying Han, Caiqin Yan, Changchun Zhang, Le Chen, Wei Wang, JingJing Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou China Xuzhou College of Industrial Technology Xuzhou China Xi’an Jiaotong-Liverpool University Taicang Jiangsu Suzhou215400 China

The rheological properties of red blood cells (RBCs) are crucial for human health. Combining optical tweezers with microfluidics provides a non-contact, sensitive, and high-throughput method for studying RBC rheology. However, the limited trapping capacity of optical tweezers restricts RBC flow within microchannels, reducing individual RBC capture efficiency. To address this, we developed a multichannel microfluidic chip with a pressure relief structure. Integrating this with optical tweezers using time-division multiplexing enabled simultaneous capture of RBCs across multiple microchannels. This method not only enhances sample throughput during optical tweezer measurements but also allows individual capture and analysis of multiple flowing RBCs in the same timeframe. Image recognition analysis of RBCs captured by optical tweezers revealed distinct morphological differences between normal and diseased RBCs, consistent with finite element method simulations of RBC rheological behavior. This approach provides quantitative characterization of RBC rheology and enables effective detection. © 2024, The Authors. All rights reserved.

关键词： Microfluidics

来源：评论

学校读者我要写书评

暂无评论

Angle-Of-Arrival Target Tracking Using A Mobile Uav In External Signal-Denied Environment 48

Angle-Of-Arrival Target Tracking Using A Mobile Uav In Exter...

引用

48th IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2023

作者： Zhu, Bing Xu, Sheng Rice, Feng Doǧançay, Kutluyil Chinese Academy of Sciences Shenzhen Institute of Advanced Technology Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen518055 China University of Chinese Academy of Sciences Beijing101408 China QinetiQ Australia Mawson LakesSA5095 Australia UniSA Stem University of South Australia Mawson Lakes5095 Australia

ISBN: (纸本)9781728163277

This paper focuses on the angle-of-arrival (AOA) target tracking problem using a mobile unmanned aerial vehicle (UAV) equipped with an angle-of-arrival (AOA) sensor to observe targets in an external-denied (no global positioning system, inertial navigation system aid) environment. The mathematical formulations are based on two known anchors. The extended Kalman filter (EKF) is modified to calculate the UAV's and target's absolute coordinates. To improve the tracking accuracy, a gradient-based UAV path optimization algorithm using simultaneous perturbation stochastic approximation (SPSA) is developed. The geometry of anchors and UAV impacts the estimation accuracy, especially when the selected anchors are close to the target. The simulations have demonstrated the effectiveness of the proposed scheme. © 2023 IEEE.

关键词： angle-of-arrival target tracking external signal-denied path optimization Unmanned aerial vehicle

来源：评论

学校读者我要写书评

暂无评论

All-Fiber Mode-Locked Femtosecond Laser Based on Er: YAG Crystal-Derived Silica Fiber

All-Fiber Mode-Locked Femtosecond Laser Based on Er: YAG Cry...

引用

2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Wan, Ying Jiang, Chen Zheng, Yuxia Chen, Yongtao Yusufu, Taximaiti Wen, Jianxiang School of Physics and Optoelectronic Engineering Nanjing University of Information Science & Technology The Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean Nanjing China Nanjing University of Posts and Telecommunications Advanced Photonic Technology Lab Nanjing China School of Communication and Information Engineering Shanghai University Key Lab of Specialty Fiber Optics and Optical Access Networks Shanghai China School of Physics and Electronic Engineering Xinjiang Normal University Xinjiang Key Laboratory for Luminescence Minerals and Optical Functional Materials Urumqi China

We demonstrated an all-fiber mode-locked femtosecond laser employing a 7.6 cm long Er: YAG crystal-derived silica fiber. The mode-locked pulses operate with a duration of ∼ 686 fs and achieve a signal-to-noise ratio ... 详细信息

ISBN: (纸本)9798350312614

关键词： Er: YAG crystal-derived silica fiber femtosecond pulse mode-locked fiber laser

来源：评论

学校读者我要写书评

暂无评论

Self-Assembly Zn-Containing Layer on Peo-Coated Mg with Enhanced Corrosion Resistance, Antibacterial Activity, and Osteogenic Property

SSRN

引用

SSRN 2023年

作者： Qian, Kun Wang, Cheng Yang, Mengmeng Zou, Xue Xue Zhang, Yue Dong, Qiangsheng Wang, Xianli Shao, Yi Cheng, Zhaojun Ju, Jia An, X.L. Chen, Zhi Quan Xue, Feng Bai, Jing Chu, Chenglin School of Materials Science and Engineering Southeast University Jiangning Jiangsu Nanjing211189 China Jiangsu Key Laboratory for Advanced Metallic Materials Jiangning Jiangsu Nanjing211189 China Southeast University Suzhou215163 China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of Technology Nanjing211167 China School of Basic Medical Sciences Guangxi Medical University Guangxi Nanning530021 China Jiangsu Key Laboratory for Light Metal Alloys Nanjing211212 China

In this study, a multifunctional Zn-containing layer was self-assembled on the external surface of the plasma electrolytic oxidation (PEO)-coated Mg during PEO process, enhancing corrosion resistance, antibacterial activity, and osteogenic property. The external Zn-containing layer composed of ZnO and Zn3(PO4)2 provided PEO coating with both increased thickness and improved chemical stability. The ZnO in the Zn-containing layer generated reactive oxygen species (ROS) under ultrasonic or UV stimulation, synergistically killing bacteria effectively. Controlled release of Zn2+ and Mg2+ ions from PEO-coated Mg promotes cell proliferation and osteogenic differentiation. This study benefits the design of biological functional coating on Mg-based implant materials. © 2023, The Authors. All rights reserved.

关键词： Self assembly

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：