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Glycine-nitrate combustion engineering of neodymium cobaltite nanocrystals

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Rare Metals 2021年第7期40卷 1778-1784页

作者： Ekaterina Alekseevna Tugova Oleg Nikolaevich Karpov New Inorganic Materials laboratory Ioffe InstituteSaint-Petersburg 194021.Russia Department of Physical Chemistry Saint Petersburg Electrotechnical University“LETT”Saint-Petersburg 197376Russia

NdCoO_(3)nanocrystals formed via glycine-nitrate combustion method followed by heat treatment has been systematically *** of NdCoO_(3)nanocrystals with minimal size of 7-10 nm from X-ray amorphous combustion products has been elucidated to be a very rapid process,occurring at the temperature of 550-600℃for5-30 *** comparison of the minimum sizes of NdCoO_(3)crystallites obtained from the offered empirical relation dmin=lunit cell·N(where N is 7-12 and‘unit cellis elementary cell parameter)and the data determined on the basis of X-ray diffraction(XRD)and transmission electron microscopy(TEM)showed good *** existence of special nanoporous microstructure and spatial limitations prevent NdCoO_(3)particle *** kinetic equation based on Avrami-Erofeev nucleation model was offered to be correlated well with experimental data of fractional conversion(a)versus isothermal time(s).The apparent activation energy(Ea=(338±32)kJ)of formation of NdCoO_(3)nanocrystals from X-ray amorphous combustion products obtained in excess of oxidant followed by heat treatment at 550-600℃was determined.

关键词： Rare earths Perovskite Kinetics Mechanism Combustion synthesis Nucleation

Microwave diagnostics of pulsed atmospheric discharge with electrolytic electrode and long-lived luminous formation in its afterglow

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High Voltage 2024年第1期9卷 127-136页

作者： Shixin Zhao Xingbao Lyu Aleksandr Astafiev Chengxun Yuan Lin Miao Jingfeng Yao Ying Wang Anatoly Kudryavtsev Aleksandr Chirtsov Gennadii Shabanov Zhongxiang Zhou School of Physics Harbin Institute of TechnologyHarbinChina Physics Department Saint Petersburg Electrotechnical University“LETI”St.PetersburgRussia Heilongjiang Provincial Key laboratory of Plasma Physics and Application Technology HarbinChina Physics Department St.Petersburg State UniversitySt.PetersburgRussia Konstantinov Petersburg Nuclear Physics Institute National Research Centre“Kurchatov Institute”GatchinaRussia

The Gatchina discharge phenomenon holds significant promise as a laboratory model for simulating ball ***,crucial aspects concerning the plasma components of the resulting afterglow remain ***,the measurement of the electron density,a critical parameter,has not been fully achieved thus *** this study,microwave diagnostics and video recording were employed during a pulsed Gatchina discharge,along with synchronous measurement of discharge current and *** antennas were positioned at different heights to enable separate diagnosis of the discharge and the ensuing long-lived *** findings revealed that during the active phase of the Gatchina discharge,the plasma density was substantial enough to cause reflection of an electromagnetic wave with a frequency of 20 GHz from this highly conductive *** the afterglow,the signal experienced only a moderate weakening of 10–20 percent,facilitating the determination of the time dependence of average electron density during the afterglow's passage between the two *** measurements verified the unusually slow plasma decay in the afterglow of the Gatchina discharge,suggesting the potential significance of chemi-ionisation processes involving long-lived(metastable)particles.

关键词： holds luminous electrolytic

CO_(2) electrolysis to formic acid for carbon neutralization

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Green Energy & Environment 2024年第9期9卷 1333-1335页

作者： Kezhen Qi Shu-yuan Liu Yingjie Zhang Hui Zhang Vadim Popkov Oksana Almjasheva College of Pharmacy Dali UniversityDali671000China College of Agriculture and Biological Science Dali UniversityDali671000China School of Arts Minnan Normal UniversityZhangzhou363000China Hydrogen Energy laboratory Ioffe InstituteSaint Petersburg194021Russia Department of Physical Chemistry Saint Petersburg Electrotechnical University“LETI”Saint Petersburg197022Russia

To avoid carbonate precipitation for CO_(2) electrolysis,developing CO_(2) conversion in an acid electrolyte is viewed as an ultimately challenging *** Nature,Xia et *** explored a proton-exchange membrane system for reducing CO_(2) to formic acid with a Pb±Pb SO_(4) composite catalyst derived from waste lead-acid batteries based on the lattice carbon activation *** to 93%Faradaic efficiency was realized when formic acid was produced by this technology.

关键词： CO_(2) electrolysis Proton-exchange membrane system Faradaic efficiency Carbon neutralization CO_(2) reduction reaction

Progress in the creation of long-lived atmospheric luminous formations in a pulsed electric discharge with an electrolytic electrode

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Plasma Science and Technology 2024年第12期26卷 82-88页

作者： Jingfeng YAO Jianfei LI Shixin ZHAO Chengxun YUAN Lin MIAO Nie CHEN A.M.ASTAFIEV A.A.KUDRYAVTSEV G.D.SHABANOV School of Physics Harbin Institute of TechnologyHarbin 150001People’s Republic of China Heilongjiang Provincial Key laboratory of Plasma Physics and Application Technology Harbin 150001People’s Republic of China Physics Department Saint Petersburg Electrotechnical University“LETI”St.Petersburg 197376Russia Petersburg Nuclear Physics Institute named by B.P.Konstantinov of National Research Centre Kurchatov InstituteGatchina 188300Russia

This work presents an analysis of the research conducted in many countries in recent years on the so-called Gatchina *** findings indicate that the Gatchina discharge exhibits the majority of the characteristics of natural ball lightning,making it the most effective method for reproducing and studying this *** a large extent,our new results are based on experiments performed for the first time to visualize dust particles arising in an erosive emission,as well as the formation of vortex *** experiments make it possible to explain the ability of the Gatchina discharge to maintain its shape for a long time in the afterglow.

关键词： Gatchina discharge ball lightning self-organization dusty plasma

金属有机物分解法制备的La_(0.67)Ca_(0.33)MnO_z薄膜的磁输运特性

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功能材料 2001年第2期32卷 126-128页

作者：祝向荣沈鸿烈邹世昌 TSUKAMOTO Koichi YANAGISAWA Takeshi OKUTOMI Mamoru OBARA Akira 中国科学院上海冶金研究所信息功能材料国家重点实验室上海200050 electrotechnical laboratory

利用金属有机物分解法在石英衬底上制备了多晶Ｌａ０．６７Ｃａ０．３３ＭｎＯｘ薄膜。研究了薄膜输运特性及其与温度的关系，发现薄膜的金属一半导体转变温度Ｔｐ（约１７２Ｋ）远低于其居里温度（约２４７Ｋ）；在平行于膜面的ＩＴ磁... 详细信息

利用金属有机物分解法在石英衬底上制备了多晶Ｌａ０．６７Ｃａ０．３３ＭｎＯｘ薄膜。研究了薄膜输运特性及其与温度的关系，发现薄膜的金属一半导体转变温度Ｔｐ（约１７２Ｋ）远低于其居里温度（约２４７Ｋ）；在平行于膜面的ＩＴ磁场下，７７Ｋ～３０２Ｋ温度范围内，没有磁电阻（ＭＲ）峰，而是在Ｔｐ温度以下，有一定的平台，平台处ＭＲ值约为２１％～２４％，在Ｔｐ温度以上，ＭＲ随温度上升而迅速降低；在７７Ｋ温度下，薄膜具有显著的低场磁电阻效应。上述磁输运特性与载流子在晶界附近的输运行为如强的自旋相关散射和晶粒间自旋极化隧道效应等有关。在７７Ｋ温度下，还观察到了退磁效应引起的磁电阻垂直各向导性。

关键词：金属有机物分解磁电阻晶界各向异性稀土锰基氧化物

Switching of Capacitors in an Asymmetric Induction Motor with Single-Phase Power,Triggering Several Applied Loads

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Journal of Energy and Power Engineering 2020年第3期14卷 90-99页

作者： Prado Wellington Marcos Antonio Geraldo Caixeta Guimarães IFG Electrotechnical CoordinationItumbiaraGOBrazil Electrical Machinery laboratory Faculty of Electrical EngineeringFederal University of UberlândiaCampus Santa MônicaUberlândiaMGBrazil

xThis study has as its objective to collaborate with the expansion in the market of electric energy in rural areas,offering as such an innovative prospect to the solution of associated problems through use of the asymmetric three-phase induction motor,supplied by a single-phase *** this system,capacitor switching is applied during operation,while theoretical and practical results are presented for the application of this switching in a three-phase asymmetric induction motor of 20 hp.

关键词： Startup current capacitor switching three-phase induction motor asymmetric motor power factor

The prognostic role of high-sensitivity C-reactive protein in patients with acute myocardial infarction

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Journal of Geriatric Cardiology 2020年第7期17卷 379-383页

作者： Ekaterina A Polyakova Evgeny N Mikhaylov Department of Faculty Therapy Pavlov First Saint-Petersburg State Medical UniversitySaint-PetersburgRussian Federation Metabolic Syndrome laboratory Institute of EndocrinologyAlmazov National Medical Research CentreSaint-PetersburgRussian Federation Neuromodulation Lab and Arrhythmia Department Almazov National Medical Research CentreSaint PetersburgRussian Federation Department of Bioengineering Systems Saint-Petersburg Electrotechnical University“LETI”Saint PetersburgRussian Federation

1 Introduction Inflammation is one of the main mechanisms in the pathogenesis of atherosclerosis,and the interest to the evaluation of inflammatory biomarkers in coronary artery disease(CAD)has been increasing over the last decade.[1,2]Destabilization of chronic artery plaques,which leads to acute coronary syndromes,has been associated with inflammatory status.[1,3]。

关键词： Atrial fibrillation Coronary artery disease High sensitive C-reactive protein Myocardial infarction Prognosis

A Two-dimensional Direct-drive Generator for Wave Energy Conversion

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电工技术学报 2015年第14期30卷 75-79页

作者：潘剑飞张博 Guangzhong Cao Shenzhen Key laboratory of Electromagnetic Control Shenzhen University

For direct wave energy conversion in a two dimensional(2D) way, this paper proposes a planar, direct-drive generator based on switched reluctance principle. The proposed machine has the merit of a simple and robust structure and it is very suitable for the operation under hostile environment in the ocean. This paper first presents the design and construction of the generator. Then, performance prediction of the generator based on three dimensional(3D) time-stepping finite element methods(FEM) and power generation investigation from co-simulation are carried out. Next, preliminary generation current waveforms are inspected by the regulation of turn-on and turn-off positions based on FEM and verified by experimental results. Last, the voltage output waveform of any one axis of motion is also presented.

关键词：电工技术电工安全电工实验电工制图

二元掺杂镧锰氧化物La-Ca-Ba-Mn-O的庞磁电阻特性

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物理学报 1999年第S1期48卷 40-46页

作者：祝向荣沈鸿烈沈勤我李铁邹世昌 KoichiTsukamoto MamoruOkutomi TakeshiYanagisawa NoboruHiguchi 中国科学院上海冶金研究所信息功能材料国家重点实验室上海200050 electrotechnical laboratory 1-1-4 UMEZONO TSUKUBA

用固相反应法制备了二元掺杂的镧锰氧化物Ｌａ０－６７（Ｃａ０－６Ｂａ０－４）０－３３ＭｎＯｚ（ＬＣＢＭＯ）立方多晶体材料，研究了其磁特性和庞磁电阻特性，并与用类似方法制备的一元掺杂的Ｌａ０－６７Ｃａ０－３３ＭｎＯｚ... 详细信息

用固相反应法制备了二元掺杂的镧锰氧化物Ｌａ０－６７（Ｃａ０－６Ｂａ０－４）０－３３ＭｎＯｚ（ＬＣＢＭＯ）立方多晶体材料，研究了其磁特性和庞磁电阻特性，并与用类似方法制备的一元掺杂的Ｌａ０－６７Ｃａ０－３３ＭｎＯｚ（ＬＣＭＯ）及Ｌａ０－６７Ｂａ０－３３ＭｎＯｚ（ＬＢＭＯ）的庞磁电阻特性进行了比较．研究表明，ＬＣＢＭＯ的居里温度ＴＣ为３１２Ｋ，介于ＬＣＭＯ和ＬＢＭＯ的ＴＣ（分别为２８０，３６２Ｋ）之间，其金属半导体转变温度Ｔｐ和μ０Ｈ＝０－６Ｔ下的磁电阻（ＭＲ）峰值温度Ｔｍ分别为３０６，２９８Ｋ，接近于其ＴＣ，也介于ＬＣＭＯ和ＬＢＭＯ的Ｔｐ和Ｔｍ之间．μ０Ｈ＝０－６Ｔ下，在各自的Ｔｍ处，ＬＣＭＯ，ＬＣＢＭＯ和ＬＢＭＯ的庞磁电阻值分别达到４１％，２４－７％和８％，但在室温（３００Ｋ）处，ＬＣＢＭＯ的ＭＲ值仍达到２０％，远大于ＬＣＭＯ和ＬＢＭＯ的值（分别为２－０％和２－４％）．研究还发现，在温度远低于Ｔｍ时，ＬＣＭＯ仍保持一定的磁电阻效应，而ＬＣＢＭＯ和ＬＢＭＯ的磁电阻随温度降低而增加，这些低温磁电阻特性与材料的结构特征（如晶界和致密度）有关．

关键词：庞磁电阻效应镧锰氧温度变化电阻率居里温度磁化强度磁特性功能材料峰值温度国家重点实验室