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Quick fabrication of evenly porous PbO_(2) through potential linear increase electrodeposition

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Chinese Chemical Letters 2023年第7期34卷 240-243页

作者： hua Guo wenyu hu Zekun Zhang Duowen Yang Siyuan Guo Xiaosheng Jing Hao Xu Wei Yan Department of Environmental Science and Engineering Xi'an Jiaotong UniversityXian 710049China Research Institute of Xi'an Jiaotong University Hangzhou 311200China

Anodic oxidation electrodeposition is the primary way to prepare lead dioxide anode. The regulation of the external circuit for the reaction is a unique advantage of electrocatalytic reaction, which can regulate crystallization and accelerate the reaction process. In this study, lead dioxide coatings with uniform pore size distribution were quickly prepared on three different substrates by potential linear increase electrodeposition(PLIED). Morphology and structure analysis shows that the prepared electrodes have uniform porous morphology, and Ti/SnO_(2)/PLIED has the smallest grain size. Three electrodes all display well degradation performance to azophloxine and diclofenac sodium. Ti/PLIED, and Ti/SnO_(2)/PLIED are appreciated for degrading organics with a simple structure in low concentrations. At the same time,Ti/SnO_(2)/PLIED is more suitable for complex organics in high concentrations. Electrochemical activity tests indicate the different mechanisms of the PLIED electrodes that build the other degradation performance.Three PLIED electrodes show excellent electrical and electrochemical stability during the cycle degradation process. The results provide a reference for the subsequent anodic oxidation electrodeposition research and the regulating effect of the external circuit on coating properties.

关键词： Lead dioxide Bubble template Porous electrode Adsorption electrochemical porosity

品种权的法律基础及其对农户利益影响的案例研究

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分子植物育种 2024年第14期22卷 4854-4859页

作者：胡文宇中央司法警官学院保定071000

品种权作为知识产权的一种,其保护与实施日益受到重视。品种权旨在鼓励植物新品种的创造与推广,以促进农业科技进步和生产提升。然而,品种权的加强保护也给农户利益带来了影响,尤其在发展中国家和农业大国更为明显。本研究旨在分析品种... 详细信息

品种权作为知识产权的一种,其保护与实施日益受到重视。品种权旨在鼓励植物新品种的创造与推广,以促进农业科技进步和生产提升。然而,品种权的加强保护也给农户利益带来了影响,尤其在发展中国家和农业大国更为明显。本研究旨在分析品种权的法律基础,其对农户利益的影响以及在中国的实施情况。研究发现,虽然国际和国内法律对品种权提供保护,但农户的权益往往未得到充分保障。本研究进一步探讨了农户在品种权纠纷中的法律地位和保护不足问题,最后提出了法律调和路径,包括加强法律机制、提升农户参与度和建立有效的纠纷解决机制。研究认为,通过优化品种权管理、强化政策保障和国际合作,可以实现品种权保护与农户利益的有效平衡,促进农业可持续发展。

关键词：品种权农户利益法律基础农业发展权益平衡

Galloping Vibration Monitoring of Overhead Transmission Lines by Chirped FBG Array

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Photonic Sensors 2022年第3期12卷 88-97页

作者： Qizhong YAN Ciming ZHOU Xuebin FENG Chi DENG wenyu hu Yimin XU National Engineering Laboratory for Fiber Optic Sensor Technology Wuhan University of TechnologyWuhan 430070China School of Information Engineering Wuhan University of TechnologyWuhan 430070China School of Safety Science and Emergency Management Wuhan University of TechnologyWuhan 430070China Wuhan WUTOS Co. Ltd.Wuhan 430223China China Electric Power Research Institute Beijing 100192China Wuhan FLOES Co. Ltd.Wuhan 430223China

A distributed online fiber sensing system based on the phase-sensitive optical time domain reflectometer(Φ-OTDR)enhanced by the drawing tower fiber Bragg grating(FBG)array is presented and investigated experimentally for monitoring the galloping of overhead transmission lines.The chirped FBG array enhanced Φ-OTDR sensing system can be used to measure the galloping behavior of the overhead transmission lines(optical phase conductor or optical power ground wire),which are helpful for monitoring the frequency response characteristics of the ice-induced galloping,evaluating the motion tendencies of these cables,and avoiding the risk of flashover during galloping.The feasibility of the proposed online monitoring system is demonstrated through a series of experiments at the Special Optical Fiber Cable Laboratory of State Grid Corporation of China(Beijing,China).Results show that the proposed system is effective and reliable for the monitoring of galloping shape and characteristic frequency,which can predict the trend of destructive vibration behavior and avoid the occurrence of cable breaking and tower toppling accidents,and these features are essential for the safety operation in smart grids.

关键词： Distributed vibration sensing FBG array galloping monitoring overhead transmission lines

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一类周期伪Jacobi矩阵的逆特征值问题

数学物理学报（A辑） 2024年第3期44卷 761-770页

作者：胡文宇徐伟孺曾雨四川师范大学数学科学学院成都610066

该文考虑了一类周期伪Jacobi矩阵的逆特征值问题,该矩阵依赖于一个符号算子,该符号算子分量的变化将会对整个矩阵的谱造成很大的扰动.于是根据该矩阵特征方程根的分布情况来讨论其特征值的分布.当该符号算子中最后一个分量发生变化时,... 详细信息

该文考虑了一类周期伪Jacobi矩阵的逆特征值问题,该矩阵依赖于一个符号算子,该符号算子分量的变化将会对整个矩阵的谱造成很大的扰动.于是根据该矩阵特征方程根的分布情况来讨论其特征值的分布.当该符号算子中最后一个分量发生变化时,给出了其逆特征值问题可解的充要条件和具体的构造过程.最后,通过数值算例验证了所给算法的有效性和可行性.

关键词：周期 Jacobi 矩阵谱分布重构算法逆特征值问题

The Nearest Complex Polynomial with a Prescribed Zero

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Journal of Mathematical Research with Applications 2015年第1期35卷 39-55页

作者： wenyu hu Zhongxuan LUO College of Mathematics and Computer Science Gannan Normal University School of Mathematical Sciences Dalian University of Technology School of Software Dalian University of Technology

Nearest polynomial with given properties has many applications in control theory and applied mathematics. Given a complex univariate polynomial f(z) and a zero α, in this paper we explore the problem of computing a complex polynomial f(z) such that f(α) = 0 and the distance ∥f-f ∥ is minimal. Considering most of the existing works focus on either certain polynomial basis or certain vector norm, we propose a common computation framework based on both general polynomial basis and general vector norm, and summarize the computing process into a four-step algorithm. Further, to find the explicit expression of f(z), we focus on two specific norms which generalize the familiar lp-norm and mixed norm studied in the existing works, and then compute f(z) explicitly based on the proposed algorithm. We finally give a numerical example to show the effectiveness of our method.

关键词： nearest polynomial explicit expression zero dual norm

新文科建设背景下应用型大学中国法律史教学改革的思考

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保定学院学报 2024年第4期37卷 72-76页

作者：杨晓辉胡文宇中央司法警官学院法学院河北保定071000

新文科建设同课程思政的建设目标有相通之处,作为专业课教师,需要通过教学内容的设计,实现教学的育人目标。而应用型大学的培养目标决定了教学对象的特殊性,是教学过程必须考虑的因素。因此,根据新文科建设及应用型大学人才培养的需要,... 详细信息

新文科建设同课程思政的建设目标有相通之处,作为专业课教师,需要通过教学内容的设计,实现教学的育人目标。而应用型大学的培养目标决定了教学对象的特殊性,是教学过程必须考虑的因素。因此,根据新文科建设及应用型大学人才培养的需要,在法律史教学中明确教学目标,调整教学内容,丰富教学方法,对于培养德法兼备的应用型人才具有重要意义。

关键词：新文科中国法律史应用型大学教学实践

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闭孔疝多层螺旋CT表现及临床分析

现代医用影像学 2024年第4期33卷 663-665页

作者：胡文宇张克云无锡市第八人民医院放射科江苏无锡214016

目的:分析闭孔疝的多层螺旋CT(multi-slice CT,MSCT)表现及临床特点,以提高对该病的认识水平。资料与方法:对3例经手术治疗及1例保守治疗的闭孔疝患者MSCT资料,包括位置、形态、密度及继发征象观察,结合临床资料进行分析。结果:3例发生... 详细信息

目的:分析闭孔疝的多层螺旋CT(multi-slice CT,MSCT)表现及临床特点,以提高对该病的认识水平。资料与方法:对3例经手术治疗及1例保守治疗的闭孔疝患者MSCT资料,包括位置、形态、密度及继发征象观察,结合临床资料进行分析。结果:3例发生于右侧闭孔区,1例发生于左侧闭孔区。MSCT表现:疝囊位于右侧耻骨上支闭孔沟内1例;右侧闭孔内肌与闭孔外肌之间2例,左侧闭孔外肌与耻骨肌之间1例,疝内容物均为小肠,呈结节状软组织密度影和囊状低密度影;3例以肠梗阻症状、1例以右下腹疼就诊。结论:闭孔疝临床表现无特异性,但MSCT对闭孔疝具有确诊价值,怀疑闭孔疝的患者,应常规行腹部MSCT检查。

关键词：闭孔疝体层摄影术 X线计算机

Heuristic Spectrum Assignment Algorithm in Distributed Cognitive Networks

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Wireless Sensor Network 2010年第6期2卷 411-418页

作者： Li Yu Cong Liu Zuhao Liu wenyu hu 不详

Cognitive radio is an exciting emerging technology that has the potential of dealing with the urgent requirement and scarcity of the radio spectrum. Although having multiple radio interfaces and available spectrum bands can generally increase the effective throughput, a problem arises as to what the best strategy to dynamically assign available bands to secondary users for maximizing throughput by minimizing the interference, and what the best scheme to allocate the spectrum holes to unlicensed users to maximize the fairness. This paper presents a distributed and heuristic spectrum assignment algorithm for multi-radio wireless cognitive networks in a cognitive network environment. The proposed algorithm (Fairness Bargaining with Maximum throughput, FBMT) considers the problems including system throughput and the fairness. Extensive simulation studies in 802.11 based multi-radio cognitive networks have been performed. The results indicate that the proposed algorithm can facilitate a large increase in network throughput and acquire a good fairness performance in comparison with a common spectrum assignment mechanism that is used as a benchmark in the literature.

关键词： Cognitive Network Distributed Spectrum Assignment Throughput Fairness FBMT

STATCOM/VRB改善笼型风电机组性能的控制策略

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河北电力技术 2024年第1期43卷 84-90页

作者：梁郭江虎雯雨张路徐乐司文国网宁夏电力有限公司石嘴山供电公司宁夏石嘴山753000

为了提供笼型机组发电时所需无功功率并平滑笼型机组有功功率的波动,将无功功率补偿装置STATCOM与VRB储能系统合二为一构成STATCOM/VRB装置,用以改善笼型风电机组性能。首先构建了STATCOM/VRB数学模型;然后研究系统各部分的控制策略,通... 详细信息

为了提供笼型机组发电时所需无功功率并平滑笼型机组有功功率的波动,将无功功率补偿装置STATCOM与VRB储能系统合二为一构成STATCOM/VRB装置,用以改善笼型风电机组性能。首先构建了STATCOM/VRB数学模型;然后研究系统各部分的控制策略,通过在STATCOM/VRB装置的DC/DC变换器处加装模糊控制器,并提出一种基于模糊自适应的STATCOM/VRB控制策略;最后在MATLAB/Simulink环境下进行仿真研究,结果表明在风速骤升和骤降两种情况下该控制策略依然可以有效平抑风电功率波动并维持储能系统工作在合理状态,有效提升电网安全运行水平。

关键词：笼型风电机组 STATCOM VRB储能系统模糊控制器