检索结果-南通市图书馆

Tailoring soft magnetic properties of Fe-based amorphous alloys through C addition

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2020年第2期30卷 208-212页

作者： Lingxiang shi Xiaolu Qin Kefu yao School of Materials Science and Engineering Tsinghua University

It is known that developing Fe-based amorphous alloys with the saturation flux density（Bs） higher than 1.65 T is a major *** present work,effects of C addition on magnetic properties of Fe-based amorphous alloys were systematically *** has been found that the addition of C can significantly increase the saturation flux density（Bs） and the magnetic flux density at 800 A/m(B800) of the Fe-B-C-Si-P amorphous *** the addition of C,the Bsof the amorphous alloys increase from 1.61 T(Fe83B13Si3P1) to 1.65-1.71 T(Fe83B13-xCxSi3P1,x=1.5,2,3 and 4). The Fe83B10C3Si3P1amorphous alloy possesses excellent soft magnetic properties with high Bsof 1.71 T and low Hcof 1.5 A/*** shows that density increase of the alloys and weakened metalloid-sp/metal-d bonding caused by C addition contribute to the increment of *** suggests that the newly developed high-performance amorphous alloys possess great potential in application.

关键词： Amorphous metals Magnetic properties Alloy design

Premature Tapetum Degeneration: a Major Cause of Abortive Pollen Development in Photoperiod Sensitive Genic Male Sterility in Rice

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2009年第8期51卷 774-781页

作者： Yinlian shi Sha Zhao Jialing yao College of Life Science and Technology Huazhong Agricultural University Wuhan 430070 China

Photoperiod-sensitive genic male-sterile （PSGMS） rice （Oryza sativa L.）, a natural mutant found in the rice cultivar Nongken 58, is very useful for the development of hybrid rice cultivars. Despite its widespread use in breeding programs, the initial stage of the abortive development of PSGMS rice and the possible cytological mechanisms of pollen abortion have not been determined. In the present study, a systematic cytological comparison of the anther development of PSGMS rice with its normal fertile counterpart is conducted. The results show that pollen abortion in PSGMS rice first occurs before the pollen mother cell （PMC） stage, and continues during the entire process of pollen development until pollen degradation. The abortive process was closely associated with the abnormal behavior of the tapetum. Although tapetum degeneration in PSGMS rice initiates already at the PMC stage, it proceeds slowly and does not complete until the breakdown of the pollen. Such cytological observations were supported by the results of the TUNEL （TdT-mediated dUTP Nick End Labeling） assay, which detects DNA fragmentation resulting from programmed cell death （PCD）, indicating that the premature tapetum degeneration is in the process of PCD.

关键词： male-sterility Oryza sativa programmed cell death tapetum ultrastructure

Experimental quantum Hamiltonian identification from measurement time traces

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2017年第12期62卷 863-868页

作者： shi-yao Hou Hang Li Gui-Lu Long Microsystem&Terahertz Research Center and Institute of Electronic Engineering China Academy of Engineering PhysicsMianyang 621999China State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China The Innovative Center of Quantum Matter Beijing 100084China Tsinghua National Laboratory of Information Science and Technology Beijing 100084China

Identifying Hamiltonian of a quantum system is of vital importance for quantum information *** this article, we realized and benchmarked a quantum Hamiltonian identification algorithm recently proposed(Zhang and Sarovar, 2014). we realized the algorithm on a liquid nuclear magnetic resonance quantum information processor using two types of working media with different forms of Hamiltonian. Our experiment realized the quantum identification algorithm based on free induction decay signals. We also showed how to process data obtained in a practical experiment. We studied the influence of decoherence by numerical simulations. Our experiments and simulations demonstrate that the algorithm is effective and robust.

关键词： Quantum informationHamiltonian identificationMeasurement time tracesExperimental realizationNuclear magnetic resonance

An Unprecedented Efficiency with Approaching 21%Enabled by Additive‑Assisted Layer‑by‑Layer Processing in Organic Solar Cells

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 372-375页

作者： Shuai Xu Youdi Zhang Yanna Sun Pei Cheng Zhaoyang yao Ning Li Long Ye Lijian Zuo Ke Gao Key Laboratory of Advanced Green Functional Materials College of ChemistryChangchun Normal UniversityChangchun 130032People’s Republic of China Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion School of Chemistry and Chemical EngineeringShandong UniversityQingdao 266237People’s Republic of China College of Polymer Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China State Key Laboratory and Institute of Elemento‑Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071People’s Republic of China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640People’s Republic of China Tianjin Key Laboratory of Molecular Optoelectronic Sciences School of Materials Science and EngineeringTianjin UniversityTianjin 300350People’s Republic of China State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China

Recently published in Joule,Feng Liu and colleagues from Shanghai Jiaotong University reported a record-breaking 20.8%power conversion efficiency in organic solar cells(OSCs)with an interpenetrating fibril network active layer morphology,featuring a bulk p-in structure and proper vertical segregation achieved through additive-assisted layer-by-layer *** optimized hierarchical gradient fibrillar morphology and optical management synergistically facilitates exciton diffusion,reduces recombination losses,and enhances light capture *** approach not only offers a solution to achieving high-efficiency devices but also demonstrates the potential for commercial applications of OSCs.

关键词： Organic solar cells Additive-assisted layer-by-layer processing Three-dimensional fibril morphology Bulk p-i-n structure Optical management

Kinetic scale magnetic holes in the terrestrial magnetosheath:A review

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第9期67卷 2739-2771页

作者： Quanqi shi Shutao yao Maria HAMRIN Ji LIU Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong UniversityWeihai 264209China Department of Physics UmeåUniversityUmeå90746Sweden Department of Physics University of AlbertaEdmonton T6K 2P6Canada

Magnetic holes at the ion-to-electron kinetic scale(KSMHs)are one of the extremely small intermittent structures generated in turbulent magnetized *** recent years,the explorations of KSMHs have made substantial strides,driven by the ultra-high-precision observational data gathered from the Magnetospheric Multiscale(MMS)*** review paper summarizes the up-to-date characteristics of the KSMHs observed in Earth’s turbulent magnetosheath,as well as their potential impacts on space *** review starts by introducing the fundamental properties of the KSMHs,including observational features,particle behaviors,scales,geometries,and distributions in terrestrial *** have discovered that KSMHs display a quasi-circular electron vortex-like structure attributed to electron diamagnetic *** electrons exhibit noticeable non-gyrotropy and undergo *** occurrence rate of KSMH in the Earth’s magnetosheath is significantly greater than in the solar wind and magnetotail,suggesting the turbulent magnetosheath is a primary source ***,KSMHs have also been generated in turbulence simulations and successfully reproduced by the kinetic equilibrium ***,KSMHs have demonstrated their ability to accelerate electrons by a novel non-adiabatic electron acceleration mechanism,serve as an additional avenue for energy dissipation during magnetic reconnection,and generate diverse wave phenomena,including whistler waves,electrostatic solitary waves,and electron cyclotron waves in space *** results highlight the magnetic hole’s impact such as wave-particle interaction,energy cascade/dissipation,and particle acceleration/heating in space *** end this paper by summarizing these discoveries,discussing the generation mechanism,similar structures,and observations in the Earth’s magnetotail and solar wind,and presenting a future extension perspective in this active field.

关键词： Magnetic hole Magnetic dip/cavity Electron vortex Magnetosheath Turbulence Coherent structure Mirror mode Kinetic scale Electron acceleration Whistler

同方期刊数据库

Pitting Corrosion of 13Cr Steel in Oxygen-free Completion Fluids of Organic Salt

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2013年第3期26卷 271-276页

作者： Lining XU yao MENG Yunguang shi Yan LIU Key Laboratory for Environmental Fracture (MOE) Institute of Advanced Materials and Technology University of Science and Technology Beijing

Corrosion behavior of 13Cr steel in oxygen-free completion fluids of the organic salt at 180℃ was studied. Cross-sectional morphologies of the corrosion products were observed by scanning electron microscopy. Energy dispersive spectrum （EDS） was used to study the element distribution of the corrosion product inside and outside the pits. The results show that the organic salt causes severe pitting corrosion of 13Cr steel. The width and depth of the pits increase simultaneously when the test duration prolongs, and potassium enriches inside the pits.

关键词： 13Cr steel Pitting corrosion Organic salt Completion fluids

Application-Oriented Performance Comparison of 802.11p and LTE-V in a V2V Communication System

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2019年第2期24卷 123-133页

作者： Mengkai shi Yi Zhang Danya yao Chang Lu Department of Automation Tsinghua University National Laboratory for Information Science and Technology (TNList) Tsinghua University Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies Tsinghua-Berkeley Shenzhen Institute(TBSI)

In recent years, the Vehicle-to-Vehicle(V2V) communication system has been considered one of the most promising technologies to build a much safer and more efficient transportation system. Both simulation and field test have been extensively performed to evaluate the performance of the V2V communication system. However,most of the evaluation methods are communication-based, and although in a transportation environment, lack a V2V application-oriented analysis. In this study, we conducted real-world tests and built an application-oriented evaluation model. The experiments were classified into four scenarios: static, following, face 2 face, and crossing vertically, which almost covered all the V2V communication patterns on the road. Under these scenarios, we conducted experiments and built a probability model to evaluate the performance of 802.11p and LTE-V in safetyrelated applications. Consequently, we found out that improvements are still needed in Non-Line-of-Sight scenarios.

关键词： Vehicle-to-Vehicle (V2V)communication connected vehicles performance evaluation intelligent transportation system application-oriented field test

Influence of flexible solar arrays on vibration isolation platform of control moment gyroscopes

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第5期28卷 1479-1487页

作者： yao Zhang Jing-Rui Zhang shi-Jie Xu School of Aerospace Engineering Beijing Institute of Technology School of Astronautics Beihang University

A high-performance vibration isolation platform （VIP） has been developed for a cluster of control moment gyroscopes （CMGs）. CMGs have long been used for satellite attitude control. In this paper, the influence of flexible solar arrays on a passive multi-strut VIP of CMGs for a satellite is analyzed. The reasonable parameters design of flexi- ble solar arrays is discussed. Firstly, the dynamic model of the integrated satellite with flexible solar arrays, the VIP and CMGs is conducted by Newton-Euler method. Then based on reasonable assumptions, the transmissibility matrix of the VIP is derived. Secondly, the influences of the flexible solar arrays on both the performance of the VIP and the stability of closed-loop control systems are analyzed in detail. The parameter design limitation of these solar arrays is discussed. At last, by selecting reasonable parameters for both the VIP and flexible solar arrays, the attitude stabilization performance with vibration isolation system is predicted via simulation.

关键词： Control moment gyroscope Vibration isolationplatform Attitude control Ultra quiet platform

Cyclic behavior test of a new double-arch steel gate

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第11期8卷 1731-1739页

作者： LUO yao-zhi ZHU shi-zhe CHEN Xi Space Structures Research Center Zhejiang University Hangzhou 310027 China School of Landscape Architecture and Art Zhejiang Forestry University Hangzhou 311300 China

A new double-arch structure for the gate used as tidal barrage and sluice was adopted in Caoe River Dam in China. It was a spatial structure made up of the right arch, the invert arch, the chord, etc., and was designed to bear bilateral loads. To research the cyclic behavior of the new double-arch structure, a scale-model cyclic test was conducted. First, the test setup and test method were presented in detail, and according to the test results, the cyclic behavior and failure characteristics of this structure were discussed. Then by analyzing the test cyclic envelope curve, it was found the curve was divided into three stages: the elastic stage, the local plastic stage and the failure stage at the local yield point and structural yield point. The gate model has local yield strength and structural yield strength, with both their values being bigger than that of the designing load. Therefore, the gate is safe enough for the projects. At last, dynamic property of the gate was analyzed considering additional mass of the water. It was found that the tidal bore shock would not cause resonance vibration of the gate.

关键词： Double-arch steel gate Cyclic behavior test Cyclic envelope curve Dynamic property