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红外热成像机器人在变电站电缆沟巡视中的应用

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集成电路应用 2024年第2期41卷 120-121页

作者：马英杰梁昊宇林超彬黄小朋中国南方电网有限责任公司超高压输电公司梧州局广西543000

阐述变电站电缆沟巡视存在的问题及原因,分析红外热成像机器人的实验过程。结果表明,应用红外热成像机器人在变电站电缆沟巡视,避免人工巡查方式的局限,这是一种先进的电缆巡视方法。

关键词：巡视机器人红外热成像电缆沟巡视

magnetoresistance retraction behaviour of Ag/p-Ge:Ga/Ag device under pulsed high magnetic field

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Journal of materials Science & Technology 2022年第19期114卷 1-6页

作者： Xiong He Zhengcai Xia haoyu Niu Zhuo Zeng Wuhan National High magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China School of Physics Huazhong University of Science and TechnologyWuhan 430074China

In non-magnetic semiconductor materials,unsaturated magnetoresistance(MR)effect has attracted lots of attention due to its physical interests and potential applications in electronic *** the ex-tremely high magnetic field,the stability and reliability of MR effects based on the non-ohmic transport has been rarely *** this paper,the transport properties of non-magnetic Ag/p-Ge:Ga/Ag devices under 45 T pulsed high magnetic field at 300 K are *** is found that in ohmic conduction re-gion(Ima)where the single dominant carrier is hole,the MR values increase with increasing the applied magnetic field,presenting a conventional unsaturated *** the two non-ohmic regions(5 ma≤I≤100 ma)where the transport is dominated by bipolar(electrons and holes),a MR retraction has been obviously observed under pulsed high magnetic *** the Hall measurement results and calculation of Hall effect with bipolar-driven transport model,the mechanism of the MR retraction is analysed,in which the MR retraction may be related to the strong regulation of electron-to-hole den-sity ratio by pulsed high magnetic *** work provides a reference for evaluating the stability and reliability of the properties of non-magnetic semiconductor based MR devices under the interference of strong magnetic pulses.

关键词： Germanium-based device magnetoresistance Bipolar transport Retraction behavior Pulsed high magnetic field

Early Cretaceous subduction initiation beneath southern Tibet caused the northward flight of India

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Geoscience Frontiers 2020年第4期11卷 1123-1131页

作者： haoyu Hu Robert J.Stern Geosciences Department University of Texas at DallasRichardsonTX75083-0688USA

Collision between the Indian and Eurasian plates formed the ~2500 km long Yarlung Zangbo Suture Zone and produced the Himalaya mountains and Tibetan *** we offer a new explanation for tectonic events leading to this collision:that the northward flight of India was caused by an Early Cretaceous episode of subduction initiation on the southern margin of *** data for ophiolites along the Yarlung Zangbo Suture Zone show restricted ages between 120 ma and 130 ma,and their supra-subduction zone affinities are best explained by seafloor spreading in what became the forearc of a north-dipping subduction zone on the southern margin of *** subsequent evolution of this new subduction zone is revealed by integrating data for arcrelated igneous rocks of the Lhasa terrane and Xigaze forearc basin *** slab pull from this new subduction zone triggered the rifting of India from East Gondwana in Early Cretaceous time and pulled it northward to collide with Tibet in Early Paleogene time.

关键词： Cretaceous northward subduction

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基于铋与醚类电解液耦合的钠离子电池

电池 2024年第1期54卷 19-23页

作者：姜楠王秀丰石海鹏李昊宇国网内蒙古东部电力有限公司电力科学研究院内蒙古呼和浩特010000 东北电力大学化学工程学院吉林吉林132012

钠离子电池的应用受限于高温引发的安全隐患和容量衰减等问题。用简单的掺杂、包覆等修饰方法改善电池高温性能仍有局限,寻找合适的电解液体系成为扩大工作温度范围的较好方法。研究1 mol/L NaPF_(6)/乙二醇二甲醚(DME)或NaPF_(6)/碳酸... 详细信息

钠离子电池的应用受限于高温引发的安全隐患和容量衰减等问题。用简单的掺杂、包覆等修饰方法改善电池高温性能仍有局限,寻找合适的电解液体系成为扩大工作温度范围的较好方法。研究1 mol/L NaPF_(6)/乙二醇二甲醚(DME)或NaPF_(6)/碳酸丙烯酯(PC)两种电解液在Na|Bi电池中的特性。采用DME基电解液的电池,在60℃下,以400 ma/g电流在0~1.5 V循环100次后,比容量保持294 mah/g,为常温下的92.45%。温度(20~80℃)和电流(400~2 000 ma/g)变化导致的电池比容量衰减不明显。由SEM和电化学阻抗测试可知,DME与Bi在耦合作用下形成的孔状结构,限制了Bi的体积膨胀,同时电池呈现较低的电化学阻抗,揭示了DME基电解液的Na|Bi电池具有优良高温电化学性能的原因。

关键词：钠离子电池高温铋电解液耦合作用

Electrochemical extraction of cerium and formation of Al–Ce alloy from CeO_2 assisted by AlCl_3 in LiCl–KCl melts

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Science China Chemistry 2014年第11期57卷 1477-1482页

作者： ZHANG Meng WANG haoyu HAN Wei ZHANG MiLin LI YunNa WANG YanLi XUE Yun ma FuQiu ZHANG XingMei Fundamental Science of Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Key Laboratory of Superlight materials and Surface Technology Ministry of Education Harbin Engineering University

This work presents an electrochemical extraction of cerium and synthesization of Al–Ce alloy in LiCl–KCl melts on Mo and Al electrodes by chlorination of CeO2 using AlCl3 at 873 K. The cyclic voltammogram on Mo electrodes in LiCl–KCl–CeO2 melt showed no obvious reduction wave other than the reduction of Li(I). After the addition of AlCl3, the signals of the reaction of Ce(ⅡI)/Ce(0) and the synthesization of Al–Ce and Al–Li alloys were investigated by cyclic voltammetry, square-wave voltammetry, open-circuit chronopotentiometry and chronopotentiometry. These results indicated that AlCl3 can chloridize CeO2 and that it is possible to extract cerium and form Al–Ce and Al–Li–Ce alloys in LiCl–KCl–CeO2–AlCl3 melts. According to potentiostatic electrolysis, only the Al4 Ce layer coated the Al electrodes. According to galvanostatic electrolysis, Al–Ce(Al4Ce, Al3 Ce, and Al92Ce8), Al2Li3, and Al phases were formed on Mo electrodes, and the content of cerium in the Al–Li–Ce alloys was more than 17 wt%.

关键词： cerium Al–Ce alloy electrodeposition electrochemical extraction molten salts

栽培丹参居群rbcL基因遗传多样性及系统学分析

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中国科技论文在线精品论文 2021年第3期14卷 304-313页

作者：冯洁廖芳孔德英刘伟尹艳艳马浩予唐嘉浩任瑞花李关荣西南大学农学与生物科技学院重庆400716 天津海关动植物与食品检测中心天津300461 重庆海关技术中心重庆401333

为了解栽培丹参居群叶绿体rbcL基因的遗传多样性及其系统发育关系,本研究以征集到的国内40个栽培丹参居群为材料,采用PCR扩增其rbcL基因,首次利用生物信息学手段分析比较基因及其推定氨基酸序列的差异.结果表明:克隆得到的丹参rbcL基因... 详细信息

为了解栽培丹参居群叶绿体rbcL基因的遗传多样性及其系统发育关系,本研究以征集到的国内40个栽培丹参居群为材料,采用PCR扩增其rbcL基因,首次利用生物信息学手段分析比较基因及其推定氨基酸序列的差异.结果表明:克隆得到的丹参rbcL基因部分序列(开放阅读框)经与参考序列对位排齐后长度为1272 bp;共有43个单核苷酸多态性(single nucleotide polymorphism,SNP)变异位点,其中转换位点33个、颠换位点10个,变异率为3.4%;基于rbcL基因的SNP指纹可区别6个栽培丹参类群;rbcL基因的推定氨基酸序列差异分析首次发现了10个氨基酸变异位点,其中有5个实质性氨基酸变异可能导致rbcL的空间结构及其与rbcS复合后的活性变化;基于丹参rbcL基因的推定氨基酸序列指纹可区别5个栽培丹参类群.本研究基于rbcL基因揭示出的不同地区丹参种质资源的遗传多样性和系谱关系,为栽培丹参种质的遗传鉴定和光合能力差异的分子机制研究奠定了基础.

关键词：分子生物学丹参栽培居群 rbcL基因遗传多样性系统发育关系

Φ244.48 mm×13.84 mm R95套管拉伸性能和几何尺寸超标原因分析

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石油管材与仪器 2024年第1期10卷 83-86页

作者：王冬林霍轩马鑫钟琦唐浩宇闫凯中国石油集团工程材料研究院有限公司陕西西安710077 中国石油煤层气有限责任公司北京物资分公司陕西西安710082 中国石油西南油气田公司物资分公司四川成都610031

某公司生产的Φ244.48 mm×13.84 mm R95套管热处理后出现批量性力学性能超标和几何尺寸不合格现象,主要表现为屈服强度大于标准值,不合格率90%;外径普遍增大0.23~0.56 mm,但未超标;壁厚减少0.05~0.21 mm,30%超标;10%椭圆度超过2 mm;10... 详细信息

某公司生产的Φ244.48 mm×13.84 mm R95套管热处理后出现批量性力学性能超标和几何尺寸不合格现象,主要表现为屈服强度大于标准值,不合格率90%;外径普遍增大0.23~0.56 mm,但未超标;壁厚减少0.05~0.21 mm,30%超标;10%椭圆度超过2 mm;10%管端直度超标。经分析,屈服强度不合格主要由回火炉温度控制不均匀、回火温度过低、回火保温时间不够等因素综合引起;外径、壁厚淬火后数值增大、回火后数值减小主要是由热处理组织变化以及淬火、回火影响程度不同而决定;椭圆度超标是由于管端长时间高温受热而发生了“坍塌”;直度不合格主要是热处理后套管发生了形状畸变而导致。针对屈服强度超上限和尺寸变化,提出了解决措施及建议,保证了Φ244.48 mm×13.84 mm R95套管后续生产质量。

关键词： R95套管热处理屈服强度回火几何尺寸

Case study of small scale polytropic index in the central plasma sheet

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Science China Earth Sciences 2015年第11期58卷 1993-2001页

作者： PANG XueXia CAO JinBin LIU WenLong ma YuDuan LU haoyu YANG JunYing LI LiuYuan LIU Xu WANG Jing WANG TieYan YU Jiang College of Physics Science and Technology Hebei University Hebei Key Laboratory of Optic-electronic Information and Materials Space Science Institute School of Astronautics Beihang University

This paper studies the effective polytropic index in the central plasma sheet （CPS） by using the method of Kartalev et al. （2006）, which adopts the denoising technique of Haar wavelet to identify the homogeneous MHD Bernoulli integral （MBI） and has been frequently used to study the polytropic relation in the solar wind. We chose the quiet CPS crossing by Cluster C1 during the interval 08：51：00-09：19：00 UT on 03 August 2001. In the central plasma sheet, thermal pressure energy per unit mass is the most important part in MBI, and kinetic energy of fluid motion and electromagnetic energy per unit mass are less important. In the MBI, there are many peaks, which correspond to isothermal or near isothermal processes. The interval lengths of homogenous MBI regions are generally less than 1 min. The polytropic indexes are calculated by linearly fitting the data of lnp and Inn within a 16 s window, which is shifted forward by 8 s step length. Those polytropic indexes with IRI ≥0.8 （R is the correlation coefficient between lnp and inn） and p-value≤0.1 in the homogeneous regions are almost all in the range of [0, 1]. The mean and median effective polytropic indexes with high R and low p-value in homogeneous regions are 0.34 and 0.32 respectively, which are much different from the polytropic index obtained by traditional method （αtrad=-0.15）. This result indicates that the CPS is not uniform even during quiet time and the blanket applications of polytropic law to plasma sheet may return misleading value of polytropic index. The polytropic indexes in homogeneous regions with a high correlation coefficient basically have good regression significance and are thus credible. These results are very important to understand the energy transport in magnetotail in the MHD frame.

关键词： polytropic index central plasma sheet MHD Bernoulli integral

Evaluation of CD24 as a marker to rapidly define the mesenchymal stem cell phenotype and its differentiation in human nucleus pulposus

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Chinese Medical Journal 2014年第8期127卷 1474-1481页

作者： Guan Xiaoming ma Xun Zhang Li Feng haoyu ma Zhuo Department of Orthopaedics Surgery Second Hospital Shanxi Medical University Taiyuan Shanxi 030001 China Department of Orthopaedics Surgery Da Yi Hospital Shanxi Medical University Taiyuan Shanxi 030032 China

Background Recent studies have indicated that human nucleus pulposus contain mesenchymal stem cells （NP-MSCs）. However, the immunophenotypic variation of NP-MSCs in vitro was unclear. The present study was conducted to address the immunophenotypic variation of mesenchymal stem cells in nucleus pulposus under continuous proliferation in vitro and show the difference between mesenchymal stem cells and nucleus pulposus cell. Methods Tissue samples were obtained from thoracolumbar burst fracture patients and degenerative disc disease patients who underwent discectomy and fusion procedures. Flow cytometric and laser scanning confocal microscope （LSCM） were used to detect the variation of mesenchymal stem cells in nucleus pulposus which were expressing CD105 and CD24 in condition with or without transforming growth factor [31 （TGF-131）. Results More than 90% of the analyzed primary cells of mesenchymal stem cells in nucleus pulposus fulfilled the general immunophenotyping criteria for MSCs, such as CD44, CD105 and CD29, but the marker of mature NP cells characterized as CD24 was negative. In continuous cultures, the proportion of mesenchymal stem cells which were expressing CD44, CD105 and CD29 in nucleus pulposus gradually decreased. The mesenchymal stem cells in nucleus pulposus cells were positive for CD105 and CD29, with slight positivity for CD44. The CD24 expression gradually increased in proliferation. Bi- parametric flow cytometry and laser scanning confocal microscopy confirmed the presence of cells which were expressing CD105 and CD24 independently, and only a small part of cells expressed both CD105 and CD24 simultaneously. TGF-{31 could stimulate mesenchymal stem cells in nucleus pulposus to express CD24. Conclusions Non-degenerative and degenerative NP contains mesechymal stem cells. The variation of CD24 can be used as a marker to identify the NP-MSCs differentiation into NP-like cells.

关键词： CD24 mesenchymal stem cell nucleus pulposus