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Ferroelectric-to-relaxor transition and ultrahigh electrostrictive effect in Sm^(3+)-doped Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)ferroelectrics ceramics

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Journal of Materials Science & Technology 2023年第34期165卷 75-84页

作者： Yunyao Huang Leiyang Zhang Wenjing Shi Qingyuan Hu Vladimir Shur Xiaoyong Wei Li Jin Electronic Materials Research laboratory Key Laboratory of the Ministry of EducationSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China School of Natural Sciences and Mathematics Ural Federal UniversityEkaterinburg 620000Russia

Rare-earth Sm^(3+)-doped Pb(Mg_(1/3)Nb_(2/3))O_(3)-0.25PbTiO_(3)(PMN-0.25PT)ferroelectric ceramics with doping amounts between 0%-3%were developed via a conventional solid-state *** doping effect of Sm^(3+)ions on the PMN-0.25PT matrix was systematically investigated on the basis of the phase structure,temperature-dependent dielectric,ferroelectric,and electrotechnical *** to the disruption of long-range ferroelectric order,the addition of Sm^(3+)ions effectively lowers the Tm(temperature corresponding to maximum permittivity)of the samples,leading to enhanced relaxor ferroelectric(RFE)characteristic and superior electric field-induced strain(electrostrain)properties at room ***,a considerable large-signal equivalent piezoelectric coefficient d∗_(33)of 2376 pm/V and a very small hysteresis were attained in the PMN-0.25PT component doped with 2.5 mol.%Sm^(3+).The findings of piezoelectric force microscopy indicate that the addition of Sm^(3+)increases the local structural heterogeneity of the PMN-0.25PT matrix and that the enhanced electromechanical performance is due to the dynamic behavior of polar ***,strong temperature-dependent electrostrain and electrostrictive coefficient Q33 are observed in the critical region around Tm in all Sm^(3+)-modified PMN-0.25PT ceramic samples *** work elucidates the phase transition behavior of Sm^(3+)-doped PMN-0.25PT and reveals a critical region where electrostrictive properties can be greatly improved due to a strong temperature-dependent characteristic.

关键词： PMN-PT ceramics Sm^(3+)doping,Equivalent piezoelectric coefficient,Local structural heterogeneity,Electrostrictive effect

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Status of the 2Q-LEBT Facility at ANL

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Chinese Physics C 2007年第S1期31卷 111-114页

作者： R.H.Scott V.N.Asseev T.V.Kulevoy P.N.Ostroumov E.A.Poklonskaya M.Sengupta N.E.Vinogradov Physics Division Argonne National LaboratoryArgonneIL 60439USA ITEP MoscowI17259Russia St.Petersburg electrotechnical University St.Petersburg197376Russia Northern Illinois University De KalbIL 60115USA

The concept for a 2 charge state injector for a'RIA type'accelerator has been *** toward an operational prototype 2Q-LEBT system at Argonne National laboratory(ANL)is under way. The existing BIE 100 all permanent magnet ECR has been placed on a high voltage platform capable of a combined>100kV with q/m separation at ground *** control of the devices on the platform has been *** components of the facility are currently being *** components of an achromatic bending system are currently being *** paper will present recent work at the facility as well as preliminary development of solid materials using the BIE 100.

关键词： ECR ion source multi charge LEBT

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Interaction of Ships within Navigable Ice Channel

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Journal of Shipping and Ocean Engineering 2014年第1期4卷 1-14页

作者： Vadim K. Goncharov Natalia Yu. Klementieva Kirill E. Sazonov Department of Ocean Technique and Marine Technologies Saint-Petersburg State Marine Technical University Saint-Petersburg190008 Russia Department of Engineering Environmental Protection Saint-Petersburg State Electrotechnical University Saint-Petersburg197376 Russia Ice laboratory Krylov State Research Centre Saint-Petersburg 196158 Russia

At intensive winter navigation, the ships should separate under movement on opposite courses or make overtaking of slowly moving cargo vessels in the water areas covered with ice. Under navigation within ice channel, possibilities for maneuvering are reduced; therefore, danger of collision of ships exists. The ice floes between vessels hulls and outside are the major factors defining values and direction of side force and yawing moment that arise on their hulls during divergence. Ice loads on the ship hull exceed considerably the loads caused by water flow around hull. Performed previously experiments in the ice basin have detected that besides increase of side force and yawing moment modules the change of side force directions occurs during the divergence of vessels in comparison with same maneuvering on water area without ice cover. Article contains the detailed problem definition and mathematical model of ships interaction during opposite passing by or overtaking and technical approach to computation of loads on vessels hulls. As example of strategy application, the simulation of loads on overtaking ship was performed, and main results of computations are presented. Outcomes of investigation are character of variation of side force and yawing moment during passage along overtaken ship and dependence of the peak values of additional ice resistance, side force and yawing moment on beam distance between vessels and thickness that are contained in the article.

关键词： Ship ice channel ice concentration navigation overtaking opposing traffic side force yawing moment

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非掺杂InP的低温光致发光研究

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红外与毫米波学报 1992年第5期11卷 420-424页

作者：沈鸿烈周祖尧杨根庆邹世昌 HisaoAsakura AkimasaYamada YunosukeMakita 中国科学院上海冶金研究所信息功能材料实验室离子束开放实验室上海200050 electrotechnical laboratory 1-1-4 Umezono Tsukuba-shi Ibaraki-ken 305 Japan

研究了2K低温下非有意掺杂InP单晶的光致发光谱,对近带边的辐射跃迁进行了仔细分析,报道了InP单晶在大功率光激发时束缚于中性施主的激子跃迁发光相对减弱、而束缚于中性受主的激子跃迁发光相对增强的现象,并探讨了其机制,确认了材料中... 详细信息

研究了2K低温下非有意掺杂InP单晶的光致发光谱,对近带边的辐射跃迁进行了仔细分析,报道了InP单晶在大功率光激发时束缚于中性施主的激子跃迁发光相对减弱、而束缚于中性受主的激子跃迁发光相对增强的现象,并探讨了其机制,确认了材料中存在Mg、Zn等残余受主杂质,并计算得到Mg受主的离化能为41.5meV.

关键词：光致发光激子磷化铟跃迁

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Spatially continuous transformer online temperature monitoring based on distributed optical fibre sensing technology

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High Voltage 2022年第2期7卷 336-345页

作者： Yunpeng Liu Xinye Li Huan Li Junyi Yin Jiaxue Wang Xiaozhou Fan State Key laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBaodingChina Hebei Provincial Key laboratory of Power Transmission Equipment Security Defence North China Electric Power UniversityBaodingChina

Transformer internal thermal monitoring exists huge blind areas,and it is difficult for traditional methods to get fully distributed temperature in real *** this contri-bution,the distributed optical fibre sensor was creatively applied inside an operating 35 kV oil‐immersed transformer which is also qualified for actual power grid oper-ation through the ex‐factory ***,the full‐region temperature along the windings and iron limbs were firstly monitored in a spatiotemporally continuous manner and the hotspots were also closely traced,fluctuating at 90%of the high‐voltage winding height(80%for low‐voltage winding)during the whole process of the heat‐run *** Finite Element Method(FEM)for thermo‐fluid field calculation was then utilized for deeper *** the former basis,the actual detected temperature distributions(both spatial and temporal)were compared with the International electrotechnical Commission traditional model and some modifi-cations were suggested based on the real time measured *** novel online monitoring application and the detailed internal thermal information may provide a solid reference for the delicate management of power transformers,which also offers a new horizon for the online monitoring in electrical apparatus industry.

关键词： winding fibre Spatial

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金属有机物分解法制备的La-Sr-Mn-O薄膜的磁输运特性(英文)

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功能材料与器件学报 2001年第2期7卷 130-134页

作者：祝向荣沈鸿烈邹世昌 Koichi Tsukamoto Takeshi Yanagisawa Mamoru Okutomi Akira Obara 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 Umezomo Tsukuba Ibraki 305- 8568

利用金属有机物分解法在非晶石英衬底上成功地制备了具有 (202)择优取向的多晶 La1－ x－SrxMnOz薄膜。原子力显微镜观察显示薄膜具有疏松的结构缺陷。在室温下，观察到薄膜磁电阻随外加磁场变化具有优良的线性特征， 10 kOe磁场下，磁... 详细信息

利用金属有机物分解法在非晶石英衬底上成功地制备了具有 (202)择优取向的多晶 La1－ x－SrxMnOz薄膜。原子力显微镜观察显示薄膜具有疏松的结构缺陷。在室温下，观察到薄膜磁电阻随外加磁场变化具有优良的线性特征， 10 kOe磁场下，磁电阻值达到 5％。在 77 K低温下，薄膜具有显著的低场磁电阻效应， 2 kOe磁场下的磁电阻值达到 11％。薄膜的电阻－温度关系具有平缓的金属－绝缘体转变，转变温度远低于其居里温度；在 8 kOe磁场下，薄膜的磁电阻随温度下降而单调上升。上述薄膜的磁输运特性与其结构缺陷 (包括晶界及疏松 )有关。

关键词：薄膜金属有机物分解法磁电阻制备磁输运现象

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Passive Intermodulation Measurement:Challenges and Solutions

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Engineering 2022年第7期8卷 181-191页

作者： Zhanghua Cai Lie Liu Francesco de Paulis Yihong Qi General Test Systems Inc. Shenzhen 518000China College of Electrical and Information Engineering Hunan UniversityChangsha 410082China UAq EMC laboratory Department of Industrial and Information Engineering and EconomicsUniversity of L’AquilaL’Aquila 64100Italy

In modern wireless communication systems,the signal-to-noise ratio(SNR)is one of the most important performance *** the other radio frequency(RF)performance of the components is well designed,passive intermodulation(PIM)interference may become an important factor limiting the system’s *** it is a base station,an indoor distributed antenna system,or a satellite system,there are stringent PIM level requirements to minimize interference and enhance network capacity in multicarrier *** for systems of high power and wide bandwidth such as 5G wireless communication,PIM interference is even more *** to the complexity and uncertainty of PIM,measurement is the most important means to study and evaluate the PIM performance of wireless communication *** this review,the current main PIM measurement methods recommended by International electrotechnical Commission(IEC)and other standard organizations are introduced,and several key challenges in PIM measurement and their solutions(including the design of PIM tester,the location of the PIM sources,the design of compact PIM anechoic chambers,and the evaluation methods of PIM anechoic chambers)are *** challenges are of great significance to solve PIM problems that may arise during device characterization and verification in real wireless communication systems.

关键词： Passive intermodulation(PIM) PIM source location Anechoic chamber

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Determination of the Performance Scores of a Photovoltaic Power Plant Connected to the Grid: The Zagtouli Photovoltaic Power Plant in Burkina-Faso

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Advances in Materials Physics and Chemistry 2024年第11期14卷 264-272页

作者： Toussaint Tilado Guingane Eric Korsaga Sosthène Tassembedo Rene Ouedraogo Physics UFR/SEA Materials and Environment Laboratory (LAME) Pr. Joseph Ki ZERBO University Ouagadougou Burkina Faso Physics UFR/ST Science and Technology Laboratory (LaST) Thomas SANKARA University Ouagadougou Burkina Faso

Photovoltaic solar energy is still in its infancy in Burkina Faso, despite the country’s high solar potential. The electricity grid is experiencing an increase in demand for energy, creating a shortfall in supply. The Zagtouli photovoltaic solar power plant in Burkina Faso is the first milestone in the development of renewable photovoltaic energy, with a rated output of 33.6 Megawatts peak, to strengthen the electricity grid by reducing hydrocarbon consumption. The aim of this work is to evaluate the performance of the plant by proposing a performance score for the Zagtouli plant, which should provide a basis for assessing the performance of a power plant. To meet the objectives, we collected data for three consecutive years of production, from 2019 to 2021. From this data, we used the method based on the calculation of the performance indicators specified by the International Energy Agency (IEA) and described in the standardised norms IEC (International electrotechnical Commission) CEI61724, and we also carried out a performance classification using the K-Means method. It is clear that with the results obtained for the PR performance index (over 70%), the installation can be classified as one of the best-performing systems. It also emerges that various losses (temperatures on the panels, cabling, partial shading, spectral losses, dirt, and unexpected inverter failures) have a negative impact on the installation’s energy production.

关键词： Solar Energy Solar Power Plant Climatic Parameters Performance Classification

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Output Voltage Model and Mechanical-Magnetic Design of Magnetostrictive Vibration Energy Harvester with a Rotating Up-Frequency Structure1

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电工技术学报 2024年第24期39卷 7639-7650页

作者： Huang Wenmei Xue Tianxiang Feng Xiaobo Weng Ling Li Mingming State Key laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130China Key laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130China

A vibration energy harvester can harvest vibration energy in the environment and convert it into electrical energy to power the sensors in the Internet of *** walking contains high-quality vibration energy,which serves as the energy source for vibration energy harvesters due to its abundant availability,high energy conversion efficiency,and environmental *** is difficult to harvest human walking vibration due to its low *** the low-frequency vibration of human walking into high-frequency vibration has attracted *** previous studies,vibration energy harvesters typically increase frequency by raising excitation frequency or inducing free *** walking frequency changes,the up-frequency method of raising the excitation frequency changes the voltage frequency,resulting in the best load resistance change and reducing the output *** up-frequency method of inducing free vibration does not increase the external excitation frequency,which has relatively low output *** paper designs a magnetostrictive vibration energy harvester with a rotating up-frequency *** consists of a rotating up-frequency structure,a magnetostrictive structure,coils,and bias *** main body of the rotating up-frequency structure comprises a torsion bar and a flywheel with a dumbbell-shaped *** magnetostrictive structure includes four magnetostrictive metal sheets spliced by Galfenol and steel *** torsion bar and flywheel interact to convert low-frequency linear vibration into rotating high-frequency excitation vibration of the *** flywheel plucks the magnetostrictive metal sheet with a high excitation frequency to generate free *** vibration energy harvester increases the excitation frequency while inducing free vibration,which can effectively improve the output *** characterize the excitation vibration and free vibration,based on the theory of Euler-Bernoulli beam theory,the vibratio

关键词： Vibration energy harvester magnetostrictive rotating up-frequency dynamic model free vibration

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FABRICATION AND CHARACTERIZATION OF ORGANIC THIN FILMS WITH NANO-STRUCTURE

FABRICATION AND CHARACTERIZATION OF ORGANIC THIN FILMS WITH ...

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中国真空学会五届三次理事会暨学术会议

作者： Takashi H Noritaka Y Chen Guorong Shin Horiuchi Norio Tanaka Tetsuo Moriya Photonics Research Institute National Institute of Advanced Industrial Science & Technology Midorigaoka 1-8-31 Ike-daOsaka 563-8577 Japan Fudan University 220 Handan Road Shanghai200433 China National Institute of Materials and Chemical Research 1-1-4 Higashi Tsukuba Ibaraki 305- 8565 Japan3 Dainichiseika Color & Chemi- cals Manufacturing Co. Ltd. 1-9-4 Horinouchi Adachi-ku Tokyo 123-8555 Japan electrotechnical laboratory 1-1-4 Umezono Tsukuba Ibaraki 305- 8568 Japan

A novel method of thin film formation of organic materials with nano-structure has been successfully developed by using vacuum technique is *** diarylethene(Ci8Hi8N2S2) was selected as a model compound for the evaluation of this method. Polymer film of PMMA, PBzMA, PHPM and PC were prepared for present experiment. By comparing these kinds of polymer, we found that the tendency of dye dispersion into the polymer is as follows:PC>PBzMA>PMMA>PHPMA, where no dispersion is observed for PHPMA under the condition of 115℃for 24 hours,Thin film of polymer alloy composed of PMMA and polystylene(PS)was loaded into a glass ample with diarylethene,and treated for three days at 100℃.Dispersed state of the dye was evaluated by transmission electron microscope, and concluded that the dye is distributed only in PS domains selectively. Photochromic properties of the PS domain will be evaluated by using a scanning nearfield optical microscope.

关键词： Nano-structure Thin polymer film Scanning nearfield optical microscope (SNOM)

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