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Simulation and test on the operation process of an intermittent filmpicking component on full-film mulched double ditches

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 99-108页

作者： Fei Dai Feng Wang wenjuan Guo Ruijie Shi Shanglong xin Xiaolong Liu Wuyun Zhao College of Mechanical and Electrical Engineering Gansu Agricultural UniversityLanzhou 730070China School of Cyber Security Gansu University of Political Science and LawLanzhou 730070China

In view of the problems in operation process of fixed rake-type residual recycling component,such as poor individual profiling effect in film picking,easy clogging of the compound of films,soil and corn stubbles,high power consumption in film picking,and strong disturbance to seedbed soil,in this study,an operation model of intermittent filmpicking on full-film mulched double ditches was proposed and an intermittent film picking component was *** DEMMBD coupled algorithm was adopted for numerical simulation on the operation process of the intermittent film-picking component on full-film mulched double ditches,and a comparative analysis was carried out on the seedbed disturbance effect and resistance variation characteristics in film-picking by fixed and intermittent film-picking *** taking the forward speed in film-picking,cam arrangement angle of the film-picking component and rotating speed of the cam shaft as independent variables,film-picking rate as the response value,a mathematical model between test factors and the film-picking rate was established,to explore the influence order of the factors on film-picking rate,and the optimal working parameters of the intermittent film-picking component were obtained as follows:the forward speed in film-picking was 2 km/h,cam arrangement angle was 180°,rotating speed of the cam shaft was 120 r/*** the optimal parameter combination,the average film-picking rate of the simulation test was 96.1%.Field test showed that,the average film-picking rate of the intermittent film-picking component was 95.6%,and 0.5%higher than that of the simulation *** working condition of the sample machine was basically consistent with the simulation process,and can accurately represent the operation mechanism of intermittent film-picking on full-film mulched double ditches,showing that the established discrete element simulation model and its parameters were accurate and reasonable.

关键词： full-film mulched double ditches residual film recovery intermittent film-picking component DEM-MBD parameter optimization

MOF-mediated synthesis of novel PtFeCoNiMn high-entropy nanoalloy as bifunctional oxygen electrocatalysts for zinc-air battery

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Nano Research 2024年第6期17卷 5288-5297页

作者： Mingkuan Xie xin Xiao Duojie Wu Cheng Zhen Chunsheng Wu wenjuan Wang Hao Nian Fayan Li Meng Danny Gu Qiang Xu Shenzhen Key Laboratory of Micro/Nano-Porous Functional Materials(SKLPM) Shenzhen 518055China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China SUSTech-Kyoto University Advanced Energy Materials Joint Innovation Laboratory(SKAEM-JIL) Shenzhen 518055China Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong Southern University of Science and TechnologyShenzhen 518055China Eastern Institute for Advanced Study Eastern Institute of TechnologyNingbo 315200China

High-entropy alloy(HEA)-based materials are expected to be promising oxygen electrocatalysts due to their exceptional *** electronic structure regulation of HEAs plays a pivotal role in enhancing their elctrocatalytic ***,PtFeCoNiMn nanoparticles(NPs)with subtle lattice distortions are constructed on metal-organic framework-derived nitrogen-doped carbon by an ultra-rapid Joule heating *** to the modulated electronic structure and the inherent cocktail effect of HEAs,the as-synthesized PtFeCoNiMn/NC exhibits superior bifunctional electrocatalytic performance with a positive half-wave potential of 0.863 V *** hydrogen electrode(RHE)for oxygen reduction reaction and a low overpotential of 357 mV at 10 mA·cm^(-2)for oxygen evolution *** assembled quasi-solid-state zinc-air battery using PtFeCoNiMn/NC as air electrode shows a high peak power density of 192.16 mW·cm^(-2),low charge−discharge voltage gap,and excellent durability over 500 cycles at 5 mA·cm^(-2).This work demonstrates an effective route for rational design of bifunctional nanostructured HEA electrocatalysts with favorable electronic structures,and opens up a fascinating directions for energy storage and conversion,and beyond.

关键词： oxygen reduction reaction oxygen evolution reaction high-entropy nano-alloy zinc-air battery

Nitric oxide damages neuronal mitochondria and induces apoptosis in neurons

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Chinese Science Bulletin 2000年第5期45卷 422-426页

作者： Taotao Wei Chang Chen Jingwu Hou Baolu Zhao wenjuan xin Chinese Acad Sci Inst Biophys Beijing 100101 Peoples R China

The cytotoxic effect of nitric oxide on primarily cultured rat cerebellar granule cells was stuatea, and the mechanisms were discussed. The results showed that nitric oxide donor S-nitroso-N-acetyl-penicillamine (SNAP; 500 (imol/L) could induce apoptosis in immature cultures of cerebellar granule cells. Flow cytometry and HPLC analyses revealed that after treatment with SNAP, the mitochondrial transmembrane potential and the cellular ATP content decreased significantly. Nitric oxide scavenger hemoglobin could effectively prevent the neuronal mitochondria from dysfunction and attenuate apoptosis. The results suggested that nitric oxide activated the apoptotic program by inhibiting the activity of mitochondrial respiratory chain and thus decreasing the cellular ATP content.

关键词： cerebellar granule cells apoptosis nitric oxide mitochondria.

Effects of r-HuEPO on the biophysical characteristics of erythrocyte membrane in patients with anemia of chronic renal failure

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Cell Research 1994年第1期4卷 57-64页

作者： SHI HONGLIAN FAJUN YANG BAOLU ZHAO wenjuan xin(Institute of Biophysics, Academia Sinica, Beijing, China.) Institute of Biophysics Academia Sinica Beijing China

Using electron spin resonance (ESR) spin labeling technique, we have studied the conformation of sulfhydryl groups(-SH) binding sites in membrane proteins and membrane fluidity of red blood cells (RBCs) from two groups of patients with anemia of chronic renal failure (ACRF). One of the groups is composed of patients who were untreated with recombinant human erythropoietin(r-HuEPO), and the other is composed of patients who were treated with r-HuEPO. The results indicated: 1) the conformation of SH group binding site in RBC membrane proteins from former group was different from those of health people. 2)the fluidity in the region near the surface of RBC membrane from former group was lower than those of healthy people. 3) However, the above biophysical properties of RBC membrane from later group were normal. We concluded that RBC membrane in patients with ACRF was abnormal, and the treatment of r-HuEPO may promote the production of normal RBCs, thus ameliorate the biophysical properties of RBCs from the patients with ACRF.

关键词： ESR Spin labeling r-HuEPO ACRF RBCs

从7个大院到1个社区:宁夏某老工业单位居民生活区的空间重组与交流重构

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现代城市研究 2021年第9期36卷 103-109页

作者：辛文娟四川外国语大学新闻传播学院四川外国语大学三线建设与社会发展研究所

20世纪90年代以来,新中国城市社会生活中的基本场景"单位大院"逐渐解体,大量单位大院中的居民逐步迁往城市社区。城市社区主要是由陌生人组成的异质社会,大院居民在融入城市社区时存在文化和情感上的隔阂,邻里关系较之单位大院疏远很多,... 详细信息

20世纪90年代以来,新中国城市社会生活中的基本场景"单位大院"逐渐解体,大量单位大院中的居民逐步迁往城市社区。城市社区主要是由陌生人组成的异质社会,大院居民在融入城市社区时存在文化和情感上的隔阂,邻里关系较之单位大院疏远很多,使"交流何以重构"成了一个重要议题。文章结合"单位"视角,扎根于中国城市空间特有的发展历史及社会脉络,以一个已经破产重组的煤矿单位的底层居民安置生活点--宁夏回族自治区J市L社区为例,通过田野调查,探讨在重组的社区空间中,底层居民如何重构交流模式及其影响因素。研究发现,底层居民充分发挥主观能动性,灵活利用甚至改造了L社区中的各种交流空间,在交流中形成了重叠多样的社会关系纽带,巩固并拓展了他们在老单位时的社交网络,最终形成了强烈的社区归属感。影响他们交流模式的因素主要包括:社区偏远的位置与完善的设施、社区外部空间政策的倾斜、单位居民多种关系的交织重叠与大量的共同行动。文章最后探讨了该案例对提升我国城市社区的治理水平的启示。

关键词：老工业单位底层居民空间交流

群体极化视域下网络舆情的演化机制研究——以微博网民讨论“浙江温岭杀医案”为例

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情报杂志 2015年第2期34卷 47-52页

作者：辛文娟赖涵四川外国语大学新闻传播学院重庆400067 重庆工商大学计算机科学与信息学院重庆400067

以2013年引发新浪微博网民热议的"浙江温岭杀医案"为例,对网民就此事的评论进行了内容分析。结合群体极化理论,探析网络舆情演化的生命周期和群体极化如何随网络舆情的演化而变,总结出群体极化在网络舆情不同发展过程中的存在形式。同时... 详细信息

以2013年引发新浪微博网民热议的"浙江温岭杀医案"为例,对网民就此事的评论进行了内容分析。结合群体极化理论,探析网络舆情演化的生命周期和群体极化如何随网络舆情的演化而变,总结出群体极化在网络舆情不同发展过程中的存在形式。同时,分析了影响网络舆情演化和群体极化变化的因素,并初步建立了一个模型来总结群体极化视角下网络舆情的演化过程。

关键词：舆情演化群体极化新浪微博浙江温岭杀医案

微博中网民群体极化的动力机制研究——基于“温岭杀医”事件的内容分析

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情报杂志 2014年第6期33卷 162-166,155页

作者：辛文娟赖涵四川外国语大学新闻传播学院重庆400067 武汉大学新闻与传播学院武汉430072 重庆工商大学计算机科学与信息学院重庆400067 武汉大学软件工程国家重点实验室武汉430072

对微博网民就2013年"浙江温岭杀医"事件的相关评论进行了内容分析,探讨网民在讨论社会热点议题时群体极化的走向及其影响因素,最终构建了在微博环境中群体极化的动力机制模型。研究发现,能促发社会情绪的事件、网民群体协同和新媒体赋... 详细信息

对微博网民就2013年"浙江温岭杀医"事件的相关评论进行了内容分析,探讨网民在讨论社会热点议题时群体极化的走向及其影响因素,最终构建了在微博环境中群体极化的动力机制模型。研究发现,能促发社会情绪的事件、网民群体协同和新媒体赋权都能促进群体极化的发展,而网民日益提升的网络素养和各部门对微博的规制可能减缓群体极化的走向,而媒体的议程设置和舆论领袖的引导则影响结果不确定,可能转化为群体极化促进力或阻力。

关键词：群体极化动力机制新浪微博“温岭杀医”事件群体协同新媒体赋权

基于单激光束信息的掘锚装备视觉定位方法研究

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煤炭科学技术 2024年第1期52卷 311-322页

作者：张旭辉陈鑫杨文娟雷孟宇田琛辉杨骏豪西安科技大学机械工程学院陕西西安710054 陕西省矿山机电装备智能监测重点实验室陕西西安710054

煤矿井下掘锚装备智能化是改善行业采掘失衡问题的关键,而掘锚装备的精确定位是实现其智能化的前提。与其他传统定位方法相比,基于视觉的位姿测量方法以其无接触、无累计误差的优势在煤矿井下得到了初步的应用。针对目前煤矿井下掘进工... 详细信息

煤矿井下掘锚装备智能化是改善行业采掘失衡问题的关键,而掘锚装备的精确定位是实现其智能化的前提。与其他传统定位方法相比,基于视觉的位姿测量方法以其无接触、无累计误差的优势在煤矿井下得到了初步的应用。针对目前煤矿井下掘进工作面掘锚装备视觉定位方法存在的合作标靶结构复杂、标定繁琐的问题,结合掘进工作面原有激光指向仪特征,提出一种基于单激光束信息的掘锚装备视觉定位方法。该方法通过分析激光指向仪光斑及光束图像特征,提出了一种基于二维反正切函数拟合的激光光斑中心提取方法和基于Hough直线检测的激光束中心线提取方法,构建了基于点线特征的双目视觉位姿解算模型,得出了掘锚装备在巷道中的实时位姿。最后,为了验证提出的特征提取方法和视觉定位方法的可行性和准确性,在实验室模拟掘进工作面工况环境搭建平台进行了试验。结果表明:基于矿用激光指向仪信息的掘锚装备视觉定位方法具有较高的位姿测量精度。在50 m的测试范围内,机身位置在巷道坐标系下沿X轴、Y轴和Z轴的平均测量误差分别为25.44、58.64、31.08 mm,其最大误差分别为55.16、127.39、63.57 mm;机身姿态在巷道坐标系下的俯仰角、偏航角和横滚角的平均测量误差分别为0.22°、0.22°、0.41°,其最大误差分别为0.29°、0.37°、0.58°。满足煤矿井下巷道施工的定位精度要求。

关键词：双目视觉单激光束视觉定位特征提取掘锚装备

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利用课程网站辅助理论教学的模式探析——以四川外语学院《新闻学概论》的课程网站为例

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新闻界 2008年第6期 185-186页

作者：辛文娟赖涵四川外语学院新闻传播学院重庆400031 重庆工商大学计算机科学与信息工程学院重庆400020

随着现代教育技术的发展,利用课程网站辅助教学已被广泛地应用。课程网站在教学中的成功运用拓展了教学空间,提高了教学效率。本文以笔者讲授的课程《新闻学概论》为例,对如何利用课程网站辅助教学、增强理论课教学效果进行了探讨。

关键词：课程网站新闻学概论教学改革