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Magnetic emission intensity enhancement for amorphous alloys by constructing a multi-phase structure withα-Fe nanocrystals

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Nano Research 2024年第7期17卷 6630-6637页

作者： Ke Liu zhi qin Jie Shen zhi Cheng Shiyue You Liang Ma Jing Zhou Wen Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Sanya Science and Education Innovation Park Wuhan University of TechnologySanya 572024China Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration ZoneXiangyang 441000China

The perturbation in the magnetic field generated by the rotation or oscillation of magnetic domains in magnetic materials can emit low-frequency electromagnetic waves,which are expected to be used in low-frequency ***,the magnetic emission intensity,defined by the perturbation ability,of current commercially applied amorphous alloys,such as Metglas,cannot meet the application requirements for low-frequency antennas due to the domain motion energy ***,a multi-phase Metglas amorphous alloy was constructed by incorporatingα-Fe nanocrystals using rapid annealing to manipulate the domain *** was found that 3.89 times higher magnetic emission intensity is obtained compared to the pristine due to the synergism of the deformation and displacement ***,the low-frequency magnetic emission performance verification was carried out by preparing magnetoelectric composites as the antenna vibrator by assembling the alloy and macro piezoelectric fiber composites(MFC).Enhancements of magnetic emission intensity are found at 93.3%and 49.2%at the first and second harmonic frequencies compared with the unmodified alloy ***,the approach leads to the development of high-performance communication with a novel standard for evaluation.

关键词： multi-phase amorphous alloys magnetic emission intensity enhancing mechanism magnetic domain pinning theory Jiles-Atherton model analysis

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Measurement of the high energyγ-rays from heavy ion reactions usingČerenkov detector

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Nuclear Science and Techniques 2024年第2期35卷 123-130页

作者： Da-Wei Si Yan Zhou Sheng Xiao zhi qin Dong Guo Yu-Hao qin Yi-Jie Wang Bo-Yuan Zhang Bai-Ting Tian zhi-Gang Xiao Department of Physics Tsinghua UniversityBeijing 100084China

The energetic bremsstrahlung photons up to 100 MeV produced in heavy ion collisions can be used as a sensitive probe for short-range correlation in atomic nuclei. The energy of the γ-rays can be measured by collecting the Čerenkov light in the medium induced by the fast electrons generated in the Compton scattering or electromagnetic shower of the incident γray. Two types of detectors based on pure water and lead glass as sensitive materials were designed for this purpose. The γresponse and optical photon propagation in the detectors were simulated based on electromagnetic and optical processes in Geant4. The inherent energy resolutions of 0.022(4) + 0.51(2)∕E^(1/2)_(γ) for water and 0.0026(3) + 0.446(3)∕E^(1/2)_(γ) for lead glass were obtained. The geometry sizes of the lead glass and water were optimized to 30 cm × 30 cm × 30 cm and 60 cm × 60 cm ×120 cm, respectively, to detect high-energy γ-rays at 160 MeV. The Hough transform method was applied to reconstruct the direction of the incident γ-rays, providing the ability to experimentally distinguish the high-energy γ-rays produced in the reactions on the target from random background cosmic-ray muons.

关键词： Bremsstrahlungγ-rays Čerenkov Geant4 Energy resolution Direction reconstruction Hough transform

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Sparse antenna array design methodologies:A review

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Journal of Electronic Science and Technology 2024年第3期22卷 1-15页

作者： Pan Wu Yan-Hui Liu zhi-qin Zhao qing-Huo Liu School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China Eastern Institute of Technology Ningbo315200China

Designing a sparse array with reduced transmit/receive modules(TRMs)is vital for some applications where the antenna system’s size,weight,allowed operating space,and cost are *** arrays exhibit distinct architectures,roughly classified into three categories:Thinned arrays,nonuniformly spaced arrays,and clustered *** numerous advanced synthesis methods have been presented for the three types of sparse arrays in recent years,a comprehensive review of the latest development in sparse array synthesis is *** work aims to fill this gap by thoroughly summarizing these *** study includes synthesis examples to facilitate a comparative analysis of different techniques in terms of both accuracy and ***,this review is intended to assist researchers and engineers in related fields,offering a clear understanding of the development and distinctions among sparse array synthesis techniques.

关键词： Clustered array Nonuniformly spaced array Sparse antenna array Synthesis method Thinned array

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Electromagnetic scattering and imaging simulation of extremely large-scale sea-ship scene based on GPU parallel technology

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Journal of Electronic Science and Technology 2024年第2期22卷 16-23页

作者： Cheng-Wei Zhang zhi-qin Zhao Wei Yang Li-Lai Zhou Hai-Yu Zhu Southwest China Institute of Electronic Technology Chengdu610036China School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China Tencent Company Shenzhen518054China

Aiming to solve the bottleneck problem of electromagnetic scattering simulation in the scenes of extremely large-scale seas and ships,a high-frequency method by using graphics processing unit(GPU)parallel acceleration technique is *** the implementation of different electromagnetic methods of physical optics(PO),shooting and bouncing ray(SBR),and physical theory of diffraction(PTD),a parallel computing scheme based on the CPU-GPU parallel computing scheme is realized to balance computing ***,a multi-GPU framework is further proposed to solve the computational difficulty caused by the massive number of ray tubes in the ray tracing *** using the established simulation platform,signals of ships at different seas are simulated and their images are achieved as *** is shown that the higher sea states degrade the averaged peak signal-to-noise ratio(PSNR)of radar image.

关键词： Multi graphics processing unit Radar imaging Sea-ship Shooting and bouncing rays

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Development of a MWDC prototype of the CSR external-target experiment

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NUCLEAR SCIENCE AND TECHNIQUES 2024年第10期35卷 1-14页

作者： He, Zhou-Bo qin, zhi Ma, Peng Yang, He-Run Wei, Xiang-Lun Lu, Chen-Gui Wen, Xiang-Jie Zhang, Xiu-Ling Chen, Tao Li, zhi-Jie Yang, Yuan-Sheng Zhan, Mei-Qiang Liu, Can-Wen Li, Meng Qiu, Tian-Li Gong, Yi-Wei Huang, Xin-Jie Yin, Xiao-Hao He, zhi-Xuan Zhang, Jun-Wei Zou, Hai-Chuan Fu, Sheng-Wei Guo, Dong Yan, Jun-Wei Cao, Zhe Deng, zhi Kong, Jie Xiao, zhi-Gang Hu, Rong-Jiang Duan, Li-Min Chinese Acad Sci Inst Modern Phys Lanzhou 730000 Peoples R China Univ Chinese Acad Sci Sch Nucl Sci & Technol Beijing 100049 Peoples R China Tsinghua Univ Dept Phys Beijing 100084 Peoples R China Univ Sci & Technol China Hefei 230026 Peoples R China Sichuan Univ Inst Nucl Sci & Technol Key Lab Radiat Phys & Technol Minist Educ Chengdu 610064 Peoples R China Lanzhou Univ Sch Nucl Sci & Technol Lanzhou 730000 Peoples R China North China Univ Water Resources & Elect Power Zhengzhou 450000 Peoples R China

The cooling storage ring (CSR) external-target experiment (CEE) is a spectrometer used in construction to study the properties of nuclear matter in high-baryon density regions at the Heavy-Ion Research Facility in Lanzhou (HIRFL). This study presents the design, simulation, manufacturing, and testing of a half-size prototype of a multi-wire drift chamber (MWDC) for the CEE. First, the performance of the MWDC connected to homemade electronics was simulated. The results demonstrated that an energy resolution of 18.5% % for 5.9-keV X-rays and a position resolution of 194 mu m for protons can be achieved by the current design. Because the size of the largest MWDC reached 176 cm x 314 cm, a set of 98 cm x 98 cm prototypes was built using the new techniques. The positioning accuracy of the anode wires in this prototype is better than 20 mu m. After optimization, using commercially available electronics, the prototype can achieved an energy resolution of 19.7% % for a Fe-55 X-ray source. The CEE-MWDC detector and electronics were simultaneously tested. An energy resolution of 22% % was achieved for the Fe-55 source; the track residuals were approximately 330 mu m for the cosmic rays. The results demonstrate that the current design and techniques meet the requirements of the CEE-MWDC array.

关键词： CEE MWDC Garfield plus plus Fe-55 source Position resolution DRIFT CHAMBER HIRFL-CSR

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丹参酮ⅡA通过Nrf2信号通路抑制肝组织铁死亡对非酒精性脂肪肝大鼠肝脏的保护作用

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中国中药杂志 2024年第6期49卷 1611-1620页

作者：秦智周敏武汉体育学院运动医学院湖北武汉430079 武汉航海职业技术学院航海技术系湖北武汉430062

探讨丹参酮ⅡA(tanshinoneⅡA,TSⅡA)对非酒精性脂肪肝(non⁃alcoholic fatty liver disease,NAFLD)大鼠肝脏的保护作用,及其通过核因子E2相关因子2(nuclear factor E2⁃related factor 2,Nrf2)信号通路对肝细胞铁死亡的调控机制。通过高脂饲料连续喂养12周构建NAFLD大鼠模型,造模成功后分为模型组,TSⅡA低、高剂量组,抑制剂组,另设对照组。通过酶联免疫吸附试剂盒检测血清超氧化物歧化酶(superoxide dismutase,SOD)和脂质过氧化产物丙二醛(malondialdehyde,MDA)含量;通过生化分析检测血清中天门冬氨酸氨基转移酶(aspartate aminotransferase,AST)、丙氨酸氨基转移酶(alanine aminotransfe⁃rase,ALT)、总胆固醇(total cholesterol,TC)、甘油三酯(triglycerides,TG)含量;苏木素⁃伊红(HE)染色检测肝组织病理损伤;通过脱氧核糖核苷酸末端转移酶介导的缺口末端标记法(terminal⁃deoxynucleoitidyl transferase⁃mediated nick end labeling,TUNEL)试剂盒检测肝组织的细胞凋亡;通过油红O染色检测各组大鼠肝组织脂质沉积;通过MitoSOX染色检测各组大鼠肝组织中氧自由基(reactive oxygen species,ROS)含量;通过普鲁士蓝染色检测肝组织中铁沉积;通过Western blot法检测肝组织中Nrf2、血红素加氧酶⁃1(heme oxygenase⁃1,HO⁃1)、谷胱甘肽过氧化物酶4(glutathione peroxidase 4,GPX4)、铁死亡抑制蛋白1(ferroptosis suppressor protein 1,FSP1)、B淋巴细胞瘤⁃2(B cell lymphoma⁃2,Bcl⁃2)和Bcl⁃2相关X蛋白(Bcl⁃2 associated X protein,Bax)的表达。结果显示,TSⅡA能明显降低大鼠血清中MDA、AST、ALT、TC和TG含量,升高SOD活性;下调肝组织细胞凋亡率,下调组织脂质沉积、ROS含量以及铁沉积;上调肝组织Nrf2、HO⁃1、FSP1、GPX和Bcl⁃2的表达,抑制肝组织Bax的表达;而抑制剂(ML385)可部分逆转TSⅡA对肝组织的保护作用。综上,TSⅡA能抑制大鼠NAFLD后肝细胞的铁死亡,下调肝组织ROS含量,降低肝组织中脂质蓄积,这可能与激活Nrf2信号通路有关。

关键词：丹参酮ⅡA 非酒精性脂肪肝核因子E2相关因子2信号通路铁死亡脂质沉积

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数字文化产业虚拟集群的形成机理及其系统动力学分析

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经济问题 2024年第1期 92-98页

作者：秦志爽吉林农业大学人文学院吉林长春130118

因现代信息技术与互联网平台属性加持,数字文化产业虚拟集群相较于传统地理集群,存在更强的集群正外部性、规模经济效应、知识溢出效应和产业分工效应,即数字文化产业虚拟集群的形成存在发展规律与内在逻辑上的必然。基于系统动力学模型... 详细信息

因现代信息技术与互联网平台属性加持,数字文化产业虚拟集群相较于传统地理集群,存在更强的集群正外部性、规模经济效应、知识溢出效应和产业分工效应,即数字文化产业虚拟集群的形成存在发展规律与内在逻辑上的必然。基于系统动力学模型,发现良好的社会经济环境、数字基础设施、升级的文化消费需求、技术要素、人力资本、文化资源禀赋以及政策因素,在“经济—资源—政策”系统内形成了显著的正反馈作用,这也是数字文化产业虚拟集群最终形成的决定性动因。我国应继续鼓励并推动文化产业融合,积极拓展虚拟集群业务功能,努力完善数字文化内容版权保护机制,强化虚拟集群的平台治理水平,引导数字文化产业虚拟集群的价值导向,从而更好地释放集群的文化价值与经济影响。

关键词：数字文化产业虚拟集群系统动力学

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战略惯性与陆权传统大国的地缘制权偏好

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东北亚论坛 2024年第4期33卷 17-39,127页

作者：秦立志中国海洋大学国际事务与公共管理学院青岛266071 中国海洋大学海洋发展研究院青岛266071

“地缘政治复归”是对21世纪大国战略竞争叙事的重要标签,呼吁地缘政治重要性的倡议要远多于地缘政治研究的实际进展。虽然大国崛起的成败不能仅仅归功于海权或陆权,但如果没有地缘制权的掌控,一国崛起和发展的地缘空间将被大大压缩。... 详细信息

“地缘政治复归”是对21世纪大国战略竞争叙事的重要标签,呼吁地缘政治重要性的倡议要远多于地缘政治研究的实际进展。虽然大国崛起的成败不能仅仅归功于海权或陆权,但如果没有地缘制权的掌控,一国崛起和发展的地缘空间将被大大压缩。相比海权传统大国而言,陆权传统大国发展海权更加强调惯性的作用,如果惯性不足,则可能招致海权发展的夭折;如果惯性过大,则可能陷入过度扩张。既有研究尚没有对战略惯性的地缘政治效应有足够关注,对“修昔底德陷阱”的分析缺乏时空因素的探究。大国的战略选择通常会受到系统、认知、行动等三重战略惯性的交互影响。本文依托新古典现实主义的大战略分析框架,将交叉性结构压力塑造的系统惯性作为自变量。由战略文化、战略动机、战略决心共同塑造的认知惯性作为中介变量。行动惯性作为因变量,其衡量指标包括战略节奏的快慢与报偿结构的动态变化。对地缘制权偏好的成因与效果评估,有助于增加崛起国因应地缘政治风险的战略容错率。

关键词：战略惯性陆权海权新古典现实主义战略偏好帝国陆海统筹

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Micro-galvanic corrosion behaviour of Mg-(7,9)Al-1Fe-xNd alloys

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Transactions of Nonferrous Metals Society of China 2024年第9期34卷 2828-2848页

作者： Kai-xuan FENG Tao LAI Yang CHEN Zheng YIN zhi-qin WU Hong YAN Hong-gun SONG Chao LUO zhi HU School of Advanced Manufacturing Nanchang UniversityNanchang 330031China Institute for Advanced Study Nanchang UniversityNanchang 330031China

The localized micro-galvanic corrosion process and the kinetic information of Mg-(7,9)Al-1Fe-x Nd alloys were investigated by in situ observation under electrochemical control and in situ atomic force microscopy(AFM)in an electrolyte *** results revealed that the formation of the Nd-rich phase in alloys resulted in a decrease in the Volta potential difference from~400 m V(AlFe3/α-Mg)to~220 mV(Nd-rich/α-Mg),reducing the corrosion products around the cathodic phase and corrosion current density of the microscale *** addition of Nd significantly improved the corrosion resistance,mainly due to the suppression of the micro-galvanic corrosion between the second phases and ***,the corrosion mechanism of Mg-(7,9)Al-1Fe-x Nd alloys was discussed based on in situ observations and electrochemical results.

关键词： magnesium alloy scanning Kelvin probe force microscope micro-galvanic corrosion in situ observation atomic force microscopy

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Unity引擎在数字孪生矿山领域的应用

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中国矿山工程 2024年第4期53卷 70-76页

作者：秦智中国恩菲工程技术有限公司北京100038

本文基于Unity引擎的功能特点,分析其在开发环境、资源利用率与跨平台开发方面的优势。结合数字孪生矿山项目的需求,详细阐述在模型数据融合与多专业协同、驾驶舱大屏应用、混合现实应用以及可视化方案展示等方面使用Unity引擎进行应用... 详细信息

本文基于Unity引擎的功能特点,分析其在开发环境、资源利用率与跨平台开发方面的优势。结合数字孪生矿山项目的需求,详细阐述在模型数据融合与多专业协同、驾驶舱大屏应用、混合现实应用以及可视化方案展示等方面使用Unity引擎进行应用开发的方法与应用场景。最后依据行业发展情况,总结Unity引擎可能存在的问题并对后续应用方向提出建议。

关键词： Unity引擎数字孪生多专业协同数据融合

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