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Effect of LiCoO_(2)on the positive temperature coefficient effect(PTC)properties of semiconductive composites and its ability to inhibit space charge injection

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High Voltage 2022年第5期7卷 1016-1022页

作者： ciyao wang Shumei Chen Yu Long Yujia Liu Chuncheng Hao Qingquan Lei Institute of Advanced Electrical Materials Qingdao University of Science and TechnologyQingdaoChina

The semiconductive shield layer is between the conductive core and the insulation layer of high voltage direct current transmission cables and plays an important role in suppressing the accumulation of space charge in the insulation *** the prevalent positive temperature coefficient effect(PTC)of the semiconducting layer leads to cable ageing and failure,this paper proposes the use of lithium cobaltate to modify the semiconducting shield to suppress its PTC effect and improve its ability to inhibit space charge *** ionic conductor LiCoO_(2)was prepared by the sol–gel ***_(2)particles with particle sizes ranging from tens to hundreds of nanometres were obtained by ball *** prepared LiCoO_(2)was used as a filler to modify the carbon black(CB)/ethylene vinyl acetate copolymer(EVA)/low density polyethylene(LDPE)*** melt blending and moulding cross-linking,LiCoO_(2)/CB/EVA/LDPE semiconductive shielding specimens were successfully ***,Thermally Stimulated Depolarisation Currents(TSDC),and pulsed electroacoustic measurements were conducted for the prepared *** PTC effect,which is common in polymer composites,was successfully suppressed,and the PTC strength was reduced by 17%.The resistivity of the semiconductive shielding layer was significantly *** ability of the semiconducting shield to inhibit space charge injection from the conductive core to the insulation layer was significantly *** LiCoO_(2)content is 0.5 wt%,the semiconductive shielding layer has the best performance,and the space charge in the insulation layer was reduced by 70%compared to the undoped semiconducting shield.

关键词： composites conductive effect

打造选本:《四六法海》的编纂及其学术个性辨析

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四川大学学报（哲学社会科学版） 2021年第3期 90-98页

作者：李慈瑶宁波大学人文与传媒学院宁波315211

晚明民间图书市场繁兴,涌现大量四六选本。其中,王志坚编纂的《四六法海》是个人与书坊合作的产物,并因其出色的文史功底、历史识见与传世雄心,呈现出高于坊间同类选本的定位与品质。不过,为了兼顾多方宗旨及市场诉求,王志坚又不得不借... 详细信息

晚明民间图书市场繁兴,涌现大量四六选本。其中,王志坚编纂的《四六法海》是个人与书坊合作的产物,并因其出色的文史功底、历史识见与传世雄心,呈现出高于坊间同类选本的定位与品质。不过,为了兼顾多方宗旨及市场诉求,王志坚又不得不借助删改、扩充等手段,掩饰或改装本人的真实思想,从而打造出一个“和而不同”的文学选本。只有精细化的文本研究,才能更好地发掘这种复杂的选本个性。

关键词：晚明《四六法海》王志坚文章选本

Protophyllocladoxylon jingyuanense ***.,a Gymnospermous Wood of the Serpukhovian(Late Mississippian) from Gansu,Northwest China

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Acta Geologica Sinica(English Edition) 2010年第2期84卷 257-268页

作者： ZHANG Yi wang Jun LIU Lujun LI Nan Paleontological Institute of Shenyang Normal University Shenyang 110034 China Nanjing Institute of Geology and Paleontology Chinese Academy of Sciences Nanjing 210008 China Shenzhen Fair Lake Botanical Garden Shenzhen 518004 China

A new species of gymnospermous fossil wood, Protophyllocladoxylon jingyuanense sp. nov., is described from the lower part of the Tsingyuan Formation （Serpukhovian/Late Mississippian）, near the coal mine of ciyao, Gansu, northwestern China. The specimen is preserved only in silicified secondary xylem, while growth rings are absent. Pits in radial tracheidal walls are araucaroid in type, uniseriate, occasionally biseriate. Xylem rays are homogeneous, uniseriate, occasionally biseriate. Cross-field pits are simple, large, one to two in number. Axial parenchyma is absent. The anatomical characters and geographic distribution of Protophyllocladoxylon woods through geological ages are documented. Those species with axial parenchyma and without growth rings live in warm climate, whereas the species without axial parenchyma and with growth rings are present either in warm or cool climate. The ideal living climate for Protophyllocladoxylon woods is warm and wet. Our new species, as a fossil wood of Early Carboniferous, is likely the earliest known species of Protophyllocladoxylon.

关键词： Protophyllocladoxylonjingyuanense growth rings axial parenchyma climate,

Discovery of Cathaysiodendron Lee from the Early Carboniferous of Jingyuan,Gansu,western China

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Progress in Natural Science:Materials International 2004年第10期14卷 63-66页

作者： wang Jun and WU Xiuyuan (Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing210008,China) Inst. of Geol. and Paleontology Chinese Acad. of Sci. Nanjing 210008 China

As one of the representative members of the Late Palaeozoic Cathaysian flora,Cathaysiodendron has been previously recorded from the Early Permian Taiyuan and Shanxi Formations in north *** species of Cathaysiodendron presented here are from the lower member of Chouniugou Formation of ciyao,Jingyuan,*** overlying marine beds yield fusulinids that are of Visean age in western Europe and conodonts of the Datang Stage in south China,so that the age of the bed containing Cathaysiodendron as Visean,Early Carboniferous,is well *** a record of Cathaysiodendron is significant in terms of Carboniferous phyto-geography and the evolution of the Cathaysian Lepidophytes.A new species,Cathaysiodendron jingyuanense wang&Wu *** described and a second one mentioned.

关键词： Cathaysiodendron Early Carboniferous Visean Cathaysian flora

农作物病虫害防治中农药污染问题及其治理对策分析

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农业灾害研究 2021年第10期11卷 7-9页

作者：王芬山东省宁阳县磁窑镇农技站山东宁阳271411

农药的使用能够减少农作物病虫害,提高农作物产量,但同时也会带来较多的污染问题,如空气污染、水体污染等,若农产品残留过多的农药,还会威胁人体健康。以山东省泰安地区为例,分析了农药污染的危害,提出农药污染治理的重要意义,从农民环... 详细信息

农药的使用能够减少农作物病虫害,提高农作物产量,但同时也会带来较多的污染问题,如空气污染、水体污染等,若农产品残留过多的农药,还会威胁人体健康。以山东省泰安地区为例,分析了农药污染的危害,提出农药污染治理的重要意义,从农民环保意识、病虫害防治思路、农药产品质量角度,探索农药污染的治理对策,以期促进生态农业、绿色农业的发展。

关键词：农作物病虫害防治农药污染

甘肃靖远石炭系纳缪尔阶高分辨率生物地层研究

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地层学杂志 2000年第1期24卷 36-48页

作者：朱怀诚王启飞中国科学院南京地质古生物研究所江苏南京210008

依据对甘肃靖远纳缪尔阶的定量地层研究 ,介绍了图形对比法的基本原理和操作过程 ,建立了靖远石炭系纳缪尔阶生物地层复合标准 ,确定了剖面间的精确对比关系 ,提出了榆树梁剖面是该区发育最为齐全的剖面。榆树梁东沟剖面纳缪尔期地层与... 详细信息

依据对甘肃靖远纳缪尔阶的定量地层研究 ,介绍了图形对比法的基本原理和操作过程 ,建立了靖远石炭系纳缪尔阶生物地层复合标准 ,确定了剖面间的精确对比关系 ,提出了榆树梁剖面是该区发育最为齐全的剖面。榆树梁东沟剖面纳缪尔期地层与榆树梁剖面同期沉积相比 ,缺失了约 30 m厚的地层 ,大水沟剖面靖远组仅相当于榆树梁剖面靖远组中部。

关键词：生物地层图形对比定量地层纳缪尔阶石炭系