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SSRN 2024年

作者： Cai, Zhengqing Song, Zhenqiang Zhang, Yanhui Feng, Shidong Li, Zijing Wang, Li-Min Center for Advanced Structural Materials State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China Key Lab for Microstructural Material Physics of Hebei Province School of Science Yanshan University Qinhuangdao066004 China

Since the introduction of metallic glasses, optimizing their compositional design has been a challenging yet crucial subject, necessitating pioneering design strategies to overcome the low efficiency problem produced by traditional trial-and-error modes. Starting from the glass formation thermodynamics, we have found that melting entropy is a more fundamental and comprehensive quantity to express the glass formation and mixing thermodynamics. This letter formulates a new composition design strategy for Zr-Cu-Ag alloys using the melting entropies in the binary Zr-Cu and Zr-Ag alloys. By combining the eutectic Zr38.2Cu61.8 and the intermetallic Zr2Ag with low melting-entropies in terms of entropy balance, where individual melting entropy is used to determine the weight coefficient of the level rules, we immediately achieve the composition Zr47.59Cu41.41Ag11, showing far higher glass forming ability than the reported Zr50Cu40Ag10 and the Zr51.22Cu26.05Ag22.73 designed based on enthalpy of mixing. The extremely high efficiency features the entropy-controlled design strategy for metallic glasses. © 2024, The Authors. All rights reserved.

关键词： Zirconium alloys

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Effects of Adding Niobium on Microstructures and Mechanical Properties of ((Zr40ti40ni20)72be28)100- X Nb X Bulk Metallic Glasses

SSRN

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SSRN 2023年

作者： Qiao, Qi Cai, Zhengqing Wang, Ji Li, Zijing Feng, Shidong Song, Zhenqiang Wang, Li-Min State Key Lab of Metastable Materials Science and Technology School of Materials Science and Engineering Yanshan University Hebei Qinhuangdao066004 China Key Lab for Microstructural Material Physics of Hebei Province School of Science Yanshan University Hebei Qinhuangdao066004 China Hebei Key Lab for Optimizing Metal Product Technology and Performance Yanshan University Hebei Qinhuangdao066004 China

Effects of adding niobium (Nb) on the glass-forming ability and mechanical properties of metallic glasses ((Zr40Ti40Ni20)72Be28)100-xNbx BMGs (at.%, x = 0, 3, 6, 9, 12) were studied by taking the (Zr40Ti40Ni20)72Be28 bulk metallic glass (BMG) alloy system as a research object. Through X-ray diffraction (XRD) and differential scanning calorimeter (DSC) tests, addition of appropriate amounts of Nb first weakens, then enhances the glass-forming ability of the alloy system and it improves the thermal stability of the alloys. Mechanical tests show that addition of Nb enhances the room-temperature plasticity of the alloys. When the Nb content is 3 at.%, the compression deformation reaches 29.7%, indicating an increase of 258% compared with that of the initial system. © 2023, The Authors. All rights reserved.

关键词： Metallic glass

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Optimizing Design of a Free Piston Stirling Engine Using Response Surface Methodology And Grey Relation Analysis

SSRN

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SSRN 2023年

作者： Ye, Wenlian Wang, Weijie Zhu, Jianbing Liu, Yingwen Key Laboratory of Fluid Machinery and System Gansu Province College of Energy and Power Engineering Lanzhou University of Technology Gansu Lanzhou730000 China Key Laboratory of Vacuum Technology and Physics Lanzhou Institute of Physics Gansu Lanzhou730000 China Key Laboratory of Thermo-Fluid Science and Engineering of MOE School of Energy and Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 PR China

Response surface methodology (RSM) and grey relation analysis (GRA) are employed to analyze and optimize the performance of a γ-type free-piston Stirling engine (FPSE). The design of experience table is determined by the RSM, with predictions made for four output parameters: displacer and piston amplitudes, operating frequency, and output power. The relation coefficients for four output parameters obtained from the RSM are determined to be 0.9980, 0.9983, 0.9999, and 0.9995, respectively, thus demonstrating the high accuracy of the RSM model. The interactive influences of piston stiffness, displacer mass, and piston mass on the four output parameters are analyzed. The results indicate that enhancing the stiffness of piston and selecting appropriate masses for both displacer and piston can improve the FPSE’s performance. Then, the FPSE’s performance is optimized using the desirability approach and GRA, respectively, and four groups of optimization results are compared to determine the most appropriate model. The maximum output power is 78.02W, while the operating frequency and the amplitudes of displacer and piston are 60.24Hz, 2.55mm, and 7.27mm. Consequently, the GRA has better optimization compared with the RSM. Therefore, this paper provides favorable guidance for the optimization of FPSE. © 2023, The Authors. All rights reserved.

关键词： Pistons

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The Regeneration of Intestinal Stem Cells Is Driven by miR-29-Induced Metabolic Reprogramming

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Engineering 2024年第11期42卷 39-58页

作者： Yingying Lin Yao Lu Yuqi Wang Cong Lv Juan Chen Yongting Luo Heng Quan Weiru Yu Lining Chen Ziyu Huang Yanling Hao Qingyu Wang Qingfeng Luo Jingyu Yan Yixuan Li Wei Zhang Min Du Jian He Fazheng Ren Huiyuan Guo National Center of Technology Innovation for Dairy Beijing 100193China Food Lab Zhongyuan Luohe 462333China Key Laboratory of RNA Biology Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Department of Food Science University of AarhusAarhus DK-8200Denmark The Key Laboratory of Geriatrics Beijing Institute of GeriatricsInstitute of Geriatric MedicineChinese Academy of Medical SciencesBeijing Hospital&National Center of Gerontology of National Health CommissionBeijing 100730China Department of Gastroenterology Beijing HospitalNational Center of GerontologyInstitute of Geriatric MedicineChinese Academy of Medical ScienceBeijing 100730China Dalian Institute of Chemical Physics Chinese Academy of ScienceDalian 116011China Washington University School of Medicine in St.Louis St.LouisMO 63130USA Department of Animal Sciences Washington State UniversityPullmanWA 99164USA

Intestinal stem cells(ISCs)initiate intestinal epithelial regeneration and tumorigenesis,and they experi-ence rapid refilling upon various injuries for epithelial repair as well as tumor *** is crucial to reveal the mechanism underlying such plasticity for intestinal *** studies have found that metabolic pathways control stem cell fate in homeostasis,but the role of metabolism in the regeneration of ISCs after damage has not been ***,we find that in a human colorectal cancer dataset,miR-29a and b(miR-29a/b)are metabolic regulators highly associated with intestinal tumorigenesis and worse prognostic value of *** also show that these two microRNAs are required for intesti-nal stemness maintenance in mice,and their expression is induced in regenerated ISCs after irradiation injury,resulting in skewed ISC fate from differentiation towards *** upregulation of miR-29a/b expression in ISCs leads to suppression of fatty acid oxidation(FAO)and depression of oxidative phosphorylation,which in turn controls the balance between self-renewal and differentiation of *** of miR-29a/b prevents these effects and thus impairs ISC-mediated epithelial ***,we filter the potential targets of miR-29a/b and identify Hnf4g,a transcription factor,that drives this metabolic reprogramming through regulating FAO-related *** work discovers an impor-tant metabolic mechanism of ISC-mediated regeneration and potentially pave the way for more targeted and effective therapeutic strategies for intestinal repair as well as tumor treatment.

关键词： MiR-29a/b Intestinal stem cells Regeneration Mitochondrial oxidative phosphorylation Fatty acid oxidation Hnf4g

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Phase-Matched High-Harmonic Generation under Nonadiabatic Conditions:Model and Experiment

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Ultrafast science 2023年第6期3卷 69-77页

作者： Yudong Chen Zongyuan Fu Baochang Li Sainan Peng Bingbing Zhu Guangyu Fan Yi Liu Chengyuan Ding Cheng Jin Zhensheng Tao State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures(MOE)and Department of PhysicsFudan UniversityShanghai 200433China Department of Applied Physics Nanjng University of Science and TechnologyNanjingJiangsu 210094China Shanghai Key Lab of Modern Optical System University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghaiChina MIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing Nanjing University of Science and TechnologyNanjingJiangsu 210094China

Nonadiabatic phase matching of high-harmonic generation(HHG)driven by few-cycle laser pulses is essential for extending harmonic energy and generating isolated attosecond ***,understanding nonadiabatic HHG is challenging due to the complex interplay of various optical phases driven by temporally and spatially varying laser *** calculations typically rely on computationally demanding 3-dimensional simulations,which can make it difficult to extract the essential features of nonadiabatic *** this work,we develop a computationally efficient 2-dimensional model that directly considers various phase contributions of *** model can well explain the experimentally observed pressure-and intensity-dependent behaviors of different harmonic *** appropriately parameterizing the single-atom response,our model can also estimate the variation of HHG spectra under different driving *** model can provide an efficient tool for the design and optimization of HHG-based applications.

关键词： harmonic adiabatic generating

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The Implication of Enhanced Cosmic Ray Diurnal Anisotropy on the Global Simultaneity of Forbush Decreases: A Statistical Approach

arXiv

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arXiv 2024年

作者： Okike, O. Alhassan, J.A. Eya, I.O. Department of Industrial Physics Ebonyi State University Abakaliki Nigeria Department of Physics and Astronomy University of Nigeria Nsukka Nigeria Physics/Electronics Technique - Department of Science Laboratory Technology University of Nigeria Nsukka Nigeria Astronomy and Astrophysics Lab Faculty of Physical Sciences University of Nigeria Nsukka Nigeria

The short-term rapid CR flux depressions, generally referred to as Forbush decreases (FDs), are the most spectacular time-intensity CR variation. The need for analytical transformation of the observational CR time series data, to account for FDs and other recurrence tendencies such as periodicities and cycles, was noted since the 1930s'. Nevertheless, it has been recently observed that harmonic analysis, which is capable of transforming raw CR data into different frequencies, is rarely exploited. Predominant in the literature are the ordinary Fourier and power spectral analyses, generally used to calculate the positive vectors (amplitude and phase) of the periodic diurnal CR anisotropy. In the two approaches, the days immediately connected with FDs are frequently removed to minimize unusual changes in the amplitude of the vectors as well as a spurious time of maximum. However, there is a paucity of publications that adjust for the influence of enhanced CR diurnal anisotropy on the magnitude and timing of FDs. Recently, in an attempt to test the global FD event simultaneity, a combination of numerical filtering and fast Fourier transform techniques was deployed to account for these superposition tendencies in daily CR data, including the intractable CR diurnal anisotropy. However, an extremely sensitive version of the software would be required to analyze high-resolution CR hourly averages. As a way of achieving accurate detection and precise timing of FD signals, the computer algorithms were technically improved and employed in a long-term statistical investigation. To appreciate the implemented extremely sensitive statistical technique, several validation analyses, including FD-based solar-terrestrial correlation, comparison of FD catalogues, and Frobush event simultaneity test were conducted. © 2024, CC BY.

关键词： Cosmic rays

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Analysis of Temperature in Switched Reluctance Motor

Analysis of Temperature in Switched Reluctance Motor

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2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020

作者： Hao, Chen Kai, Wang Wenju, Yan Yingjie, Huo China University of Mining and Technology Xuzhou China Lanzhou Institute of Physics National Key Lab of Vacuum Cryogeni Lanzhou China

ISBN: (纸本)9781728152158

This paper mainly studies and calculates the temperature field distribution of a high speed water-cooled switched reluctance motor. First, according to the actual size of the motor, an equivalent thermal model was established and the temperature rise of each node was calculated. Since the solution of the equivalent thermal circuit method results in an average temperature rise, it cannot reflect the temperature of each point inside the motor. Therefore, the finite element model of the SRM is established, and the temperature of each point in the motor is further calculated and compared with the equivalent thermal model results. Then, the influence of the polarity distribution of the SRM on the temperature distribution was analyzed using the finite element model. Finally, an experiment was conducted to measure the temperature inside the motor and verify the model. © 2020 IEEE.

关键词： Equivalent circuits

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Wave packet dynamics of entangled q-deformed states

arXiv

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arXiv 2024年

作者： Rohith, M. Anupama, S. Sudheesh, C. Quantum Systems Lab Department of Physics Government College Malappuram University of Calicut Malappuram676 509 India P. G. & Research Department of Physics Government Arts and Science College University of Calicut Kozhikode673 018 India Department of Physics Indian Institute of Space Science and Technology Thiruvananthapuram695 547 India

This paper explores the wave packet dynamics of a math-type q-deformed field interacting with atoms in a Kerr-type nonlinear medium. The primary focus is on the generation and dynamics of entanglement using the q-deformed field, with the quantification of entanglement accomplished through the von Neumann entropy. Two distinct initial q-deformed states, the q-deformed Fock state, and the q-deformed coherent state, are investigated. The entanglement dynamics reveal characteristics of periodic, quasi-periodic, and chaotic behavior. Non-deformed initial states display wave packet near revivals and fractional revivals in entanglement dynamics while introducing q-deformation eliminates these features. The q-deformation significantly influences wave packet revivals and fractional revivals, with even a slight introduction causing their disappearance. For large values of q, the entanglement dynamics exhibit a chaotic nature. In the case of a beam splitter-type interaction applied to the initial deformed Fock state, an optimal deformation parameter q is identified, leading to maximum entanglement exceeding the non-deformed scenario. © 2024, CC BY.

关键词： Wave packets

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The cooperative migration dynamics of particles correlates to the nature of hexatic-isotropic phase transition in 2D systems of corner-rounded hexagons

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Fundamental Research 2024年第2期4卷 284-290页

作者： Zhanglin Hou Mingwei Liu Yiwu Zong Fangfu Ye Kun Zhao Wenzhou Institute University of Chinese Academy of SciencesWenzhouZhejiang 325001China Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education) School of Chemical Engineering and TechnologyTianjin 300072China School of Physical Science University of Chinese Academy of SciencesBeijing 100049China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)WenzhouZhejiang 325001China Sichuan Provincial People’s Hospital University of Electronic Science and Technology of ChinaChengduSichuan 610054China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduSichuan 610054China

In the two-dimensional(2D)melting transition of colloidal systems,the hexatic-isotropic(H-I)transition can be either first-order or ***,how particle dynamics differs at the single-particle level during these two different melting transitions remains to be *** this work,by Brownian dynamics(BD)simulations,we have systematically studied the dynamic behavior of corner-rounded hexagons during the H-I transition,for a range of corner-roundness𝜁=0.40 to 0.99 that covers the crossover from the continuous to first-order nature of H-I *** results show that hexagons with𝜁≤0.5 display a continuous H-I transition,whereas those with𝜁≥0.6 demonstrate a first-order H-I *** analysis shows different evolution pathways of the dominant cluster formed by migrating particles,which results in a droplet-like cluster structure for𝜁=0.40 hexagons and a tree-like cluster structure for𝜁=0.99 *** investigations on the hopping activities of particles suggest a cooperative origin of migrating *** work provides a new aspect to understand the dependence of the nature of H-I transition on the roundness of hexagons through particle dynamic behavior.

关键词： Melting transition Colloids Hexatic phase Cooperative migration Hexagons

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Isolated Cu-Sn diatomic sites for enhanced electroreduction of CO_(2)to CO

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Nano Research 2023年第7期16卷 8729-8736页

作者： Wei Liu Haoqiang Li Pengfei Ou Jing Mao Lili Han Jun Song Jun Luo Huolin L.Xin State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Department of Physics and Astronomy University of CaliforniaIrvineCA 92697USA Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China School of Materials Science and Engineering Tianjin Key Lab of Photoelectric Materials&DevicesTianjin University of TechnologyTianjin 300384China Department of Mining and Materials Engineering McGill UniversityMontreal H3A 0C5Canada Teaching and Analytical Instrumentation Center School of Materials Science and EngineeringTianjin UniversityTianjin 300072China

Electrochemical CO_(2)reduction reaction(CO_(2)RR)to high-value product,CO,not only provides a key feedstock for the wellestablished Fischer-Tropsch process but also mitigates the greenhouse ***,it suffers from sluggish reaction kinetics,competitive hydrogen evolution reaction,and low ***,we report non-precious Cu-Sn diatomic sites anchored on nitrogen-doped porous carbon(CuSn/NPC)as an efficient catalyst for CO_(2)RR to *** catalyst exhibits outstanding selectivity with CO Faradaic efficiency(FE)up to 99.1%,much higher than those of individual Cu(66.2%)and Sn(51.3%)single-atom ***,high stability is confirmed by consecutive 24 h electrolysis with high selectivity from CO_(2)to *** calculations reveal an obvious activation of CO_(2)with weakened C-O bonds and distorted CO_(2)configuration upon chemisorption on the CuSn/NPC *** is also suggested CuSn/NPC is more selective for the CO_(2)RR with dominant CO production during the electrolysis,rather than the competing hydrogen evolution reaction.

关键词： CO_(2)reduction reaction Cu-Sn active site CO product dual-atom electrocatalyst density functional theory(DFT)calculation

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