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Pressure-driven layer-dependent phase transitions and enhanced interlayer coupling in PdSe_(2) crystals

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Nano Research 2024年第11期17卷 10170-10178页

作者： Junnan Ding Xing Xie xinyu ouyang Junying Chen Fangping ouyang Zongwen Liu Jian-Tao Wang Jun He Yanping Liu Institute of Quantum Physics School of Physics Central South University Changsha 410083 China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University Changsha 410083 China School of Physics and Technology State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources Xinjiang University Urumqi 830046 China School of Chemical and Biomolecular Engineering The University of Sydney Sydney NSW 2006 Australia The University of Sydney Nano Institute The University of Sydney Sydney NSW 2006 Australia Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Songshan Lake Materials Laboratory Dongguan 523808 China

Pressure exerts a profound influence on atomic configurations and interlayer interactions, thereby modulating the electronic and structural properties of materials. While high pressure has been observed to induce a structural phase transition in bulk PdSe_(2) crystals, leading to a transition from semiconductor to metal, the high-pressure behavior of few-layer PdSe_(2) remains elusive. Here, employing diamond anvil cell (DAC) techniques and high-pressure Raman spectroscopy, we investigate the structural evolution of layer-dependent PdSe_(2) under high pressure. We reveal that pressure significantly enhances interlayer coupling in PdSe_(2), driving structural phase transitions from an orthorhombic to a cubic phase. We demonstrate that PdSe_(2) crystals exhibit distinct layer-dependent pressure thresholds during the phase transition, with the decrease of transition pressure as the thickness of PdSe_(2) increases. Furthermore, our results of polarized Raman spectra confirm a reduction in material anisotropy with increasing pressure. This study offers crucial insights into the structural evolution of layer-dependent van der Waals materials under pressure, advancing our understanding of their pressure-induced behaviors.

关键词： palladium diselenide high pressure phase transition diamond anvil cell anisotropy

Unveiling optical anisotropy in disrupted symmetry WSe_(2)/SiP heterostructures

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Nano Research 2024年第9期17卷 8585-8591页

作者： Biqi Hu Xing Xie xinyu ouyang Junying Chen Shaofei Li Jun He Zongwen Liu Jian-Tao Wang Yanping Liu Institute of Quantum Physics School of PhysicsCentral South University932 South Lushan RoadChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University932 South Lushan RoadChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518000China

Two-dimensional(2D)transition metal dichalcogenides(TMDs)have garnered considerable attention for their promising applications in sensors and optoelectronic devices,owing to their exceptional optical,electronic,and optoelectronic ***,the inherent high symmetry of TMD lattices imposes limitations on their functional ***,we present a strategy to disrupt the C_(3)rotational symmetry of monolayer WSe_(2)by fabricating a heterostructure incorporating WSe_(2)and SiP *** comprehensive experimental investigations and first-principle calculations,we elucidate that in the WSe_(2)/SiP heterostructure,excitons-both neutral and charged-emanating from WSe_(2)exhibit pronounced anisotropy,which remains robust against temperature ***,we observe an anisotropic ratio reaching up to 1.5,indicating a substantial degree of ***,we demonstrate the tunability of exciton anisotropy through the application of a magnetic field,resulting in a significant reduction in the anisotropic ratio with increasing field strength,from 1.57 to ***,the change in heterojunction anisotropy ratio reaches 24.8%as the magnetic field *** findings elucidate that the perturbation of the C_(3)rotational symmetry of the WSe_(2)monolayer arises from a non-uniform charge density distribution within the layer,exhibiting mirror *** results underscore the potential of heterostructure engineering in tailoring the properties of isotropic materials and provide a promising avenue for advancing the application of anisotropic devices across various fields.

关键词： symmetry breaking heterostructure engineering anisotropy optical spectroscopy

Stability Analysis for a Class Pseudo-linear Complex Systems

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Stability Analysis for a Class Pseudo-linear Complex Systems

The Recognition of RMB Serial Number Based on CNN

第37届中国控制会议

作者： xinyu ouyang Nannan Zhao School of International Finance & Banking University of Science and Technology Liaoning School of Electronics and Information Engineering University of Science and Technology Liaoning

Based on inclusion principle,M-matrices theory and Lyapunov stability theory,the connective stability of a class pseudo-linear complex systems was ***,by using the inclusion principle and permutation transformation,the system is decomposed as a recurrent reverse order of pair-wise subsystems in the expanded ***,the Lyapunov functions of all isolated subsystems are constructed to ensure them stable,on this basis,the connective stability of pair-wise subsystems and the expanded system are analyzed,and the connectively stable conditions of the expanded system are *** the frame of inclusion principle,the connectively stable conditions of the expanded system are also adapt to the original ***,the theorem on stability of the pseudo-linear complex systems is given.

关键词： Complex system Connective stability Pseudo-linear Inclusion principle

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The Recognition of RMB Serial Number Based on CNN

第30届中国控制与决策会议

作者： Nannan Zhao Zhiwen Zhang xinyu ouyang Na Lv Zihui Zang School of Electronics and Information Engineering University of Science and Technology Liaoning

A method of using the two levels convolution neural network（CNN） is proposed to recognize the RMB serial number（SN）, it is a more efficient, more high-speed, more precision way than before, and it based on the CNN which can directly extract characters from the training sample. And in the process character segmentation, the window moving method is proposed for the contaminated image. Through the DSP platform, it can effectively reach the robustness of the recognition algorithm under some circumstances such as the damaged, smirched identified object, the recognition accuracy can reach at least 99.99% and the recognition time can be controlled within 5 ms.

关键词： image recognition serial number(SN) convolutional neural network(CNN) DSP

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卷积神经网络发展

辽宁科技大学学报 2021年第5期44卷 349-356页

作者：周楠欧阳鑫玉辽宁科技大学电子与信息工程学院辽宁鞍山114051

卷积神经网络作为深度学习的重要代表算法之一,被应用到人脸识别、行为识别、字符识别和图像处理等多个领域,推动着人工智能的快速发展。本文在分析整理大量文献后,总结了卷积神经网络的发展阶段,介绍了卷积神经网络的基本结构和关键技... 详细信息

卷积神经网络作为深度学习的重要代表算法之一,被应用到人脸识别、行为识别、字符识别和图像处理等多个领域,推动着人工智能的快速发展。本文在分析整理大量文献后,总结了卷积神经网络的发展阶段,介绍了卷积神经网络的基本结构和关键技术,选取LeNet、AlexNet、VGGNet、GoogLeNet和ResNet等几种具有代表性的网络进行分析对比,并指出各个网络的应用场景和优缺点,最后提出卷积神经网络未来的研究发展方向。

关键词：卷积神经网络深度学习发展综述残差网络

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基于动态图的复杂系统建模方法

计算机时代 2019年第8期 49-52,56页

作者：李慧欧阳鑫玉辽宁科技大学国际金融与银行学院

为解决具有动态拓扑结构的复杂系统的建模问题,提出一种对其进行解释结构建模和数学建模的新方法。该方法基于动态图理论,利用可达矩阵对系统进行强连通子集和区域划分;利用缩减矩阵,对系统的子系统进行级别划分;再通过缩减逆变换求取... 详细信息

为解决具有动态拓扑结构的复杂系统的建模问题,提出一种对其进行解释结构建模和数学建模的新方法。该方法基于动态图理论,利用可达矩阵对系统进行强连通子集和区域划分;利用缩减矩阵,对系统的子系统进行级别划分;再通过缩减逆变换求取系统的骨架矩阵,并利用得到的骨架矩阵,建立系统的结构模型,该模型就是一个分级动态图。该方法有利于计算机实现,具体算例验证了该方法的有效性。

关键词：动态图复杂系统解释结构建模方法

研究生组合优化课程中四轨教学协同模式的探索与实践

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中国现代教育装备 2019年第11期 115-117页

作者：王介生魏东欧阳鑫玉辽宁科技大学国际金融与银行学院

控制工程专业硕士研究生组合优化课程是以智能优化算法求解典型组合优化问题。基于LBL,CBL,PBL和RBL等4种典型教学方法,构建研究生组合优化课程的"四轨教学协同模式",充分整合组合优化问题、典型求解案例和课程教学资源,制订了该课程的... 详细信息

控制工程专业硕士研究生组合优化课程是以智能优化算法求解典型组合优化问题。基于LBL,CBL,PBL和RBL等4种典型教学方法,构建研究生组合优化课程的"四轨教学协同模式",充分整合组合优化问题、典型求解案例和课程教学资源,制订了该课程的教学计划,制作了授课课件、案例库及项目库等教学内容;在部分课程教学环节实现翻转课堂,在建立的典型组合优化问题数学模型基础上,构建智能优化算法求解策略,实现教师主导地位和学生认知主体双核心驱动的教学创新新模式的探索与实践。

关键词：组合优化研究生创新教育四轨教学协同模式

基于图像技术的EAN-13条码识别系统设计

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信息技术与网络安全 2020年第3期39卷 73-77页

作者：李慧欧阳鑫玉张锋辽宁科技大学电子与信息工程学院

条形码技术作为一种数据采集和自动识别技术应用非常广泛。为了更好地满足应用场景的自动化功能需求,利用图像处理相关技术,对EAN-13条形码识别的相关算法进行了研究。首先,针对采集到的条形码图像进行图像预处理,包括图像灰度化、基于H... 详细信息

条形码技术作为一种数据采集和自动识别技术应用非常广泛。为了更好地满足应用场景的自动化功能需求,利用图像处理相关技术,对EAN-13条形码识别的相关算法进行了研究。首先,针对采集到的条形码图像进行图像预处理,包括图像灰度化、基于Hough变换的图像倾角矫正、目标分割和图像滤波;然后根据条形码编码的既定规则,采用平均值法和校验码验证法对条形码进行译码;最后,利用MATLAB仿真软件,设计了一个条形码识别系统。通过实验验证,所设计的系统识别率可以达到99%以上,取得了很好的效果。

关键词：条码识别图像技术系统设计 EAN-13

浙江省台州市人口城镇化-土地城镇化耦合协调发展研究

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江西科学 2024年第1期42卷 93-99页

作者：欧阳欣宇刘平辉朱传民东华理工大学地球科学学院南昌330013 江西省数字国土重点实验室南昌330013

以浙江省台州市为例,从耦合协调发展的角度,利用熵值法、耦合度和协调发展度,尝试对台州市人口城镇化与土地城镇化耦合协调发展问题进行探讨。研究表明,台州市的城镇化质量在整体上呈现出上升的态势;台州市人口城镇化与土地城镇化的关系... 详细信息

以浙江省台州市为例,从耦合协调发展的角度,利用熵值法、耦合度和协调发展度,尝试对台州市人口城镇化与土地城镇化耦合协调发展问题进行探讨。研究表明,台州市的城镇化质量在整体上呈现出上升的态势;台州市人口城镇化与土地城镇化的关系,在前期的不和谐状态下慢慢协调,呈现出人口滞后的特征。台州市在今后的发展过程中,将面临劳动力不足、经济活力下降、社会负担加重等问题。最后,针对台州市城镇化的发展提出了相应的建议和措施。

关键词：人口城镇化土地城镇化耦合协调发展台州市

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