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Single crystal growth and characterization of 166-type magnetic kagome metals

Chinese Physics B 2024年第9期33卷 145-150页

作者： Huangyu Wu Jinjin Liu Yongkai Li Peng Zhu Liu Yang Fuhong Chen Deng Hu Zhiwei Wang Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Zhuhai 519000China Material Science Center Yangtze Delta Region Academy of Beijing Institute of TechnologyJiaxing 314011China

Kagome magnets were predicted to be a good platform to investigate correlated topology band structure,Chern quantum phase,and geometrical frustration due to their unique lattice *** we reported single crystal growth of 166-type kagome magnetic materials,including HfMn_(6)Sn_(6),ZrMn_(6)Sn_(6),GdMn_(6)Sn_(6)and GdV_(6)Sn_(6),by using the flux method with Sn as the *** them,HfMn_(6)Sn_(6)and ZrMn_(6)Sn_(6)single crystals were grown for the first time.X-ray diffraction measurements reveal that all four samples crystallize in HfFe6Ge6-type hexagonal structure with space group P6/*** samples show metallic behavior from temperature dependence of resistivity measurements,and the dominant carrier is hole,except for GdV6Sn6 which is electron *** samples have magnetic order with different transition temperatures,HfMn_(6)Sn_(6),ZrMn_(6)Sn_(6)and GdV_(6)Sn_(6)are antiferromagnetic with TN of 541 K,466 K and 4 K respectively,while GdMn_(6)Sn_(6)is ferrimagnetic with the critical temperature of about 470 *** study will enrich the research platform of magnetic kagome materials and help explore the novel quantum phenomena in these interesting *** dataset of specific crystal structure parameters for HfMn_(6)Sn_(6)are available in science Data Bank,with the link.

关键词： kagome metal single crystal growth crystal structure physical property

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Tracking Regulatory Mechanism of Trace Fe on Graphene Electromagnetic Wave Absorption

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Nano-Micro Letters 2024年第4期16卷 79-96页

作者： Kaili Zhang Yuhao Liu Yanan Liu Yuefeng Yan Guansheng Ma Bo Zhong Renchao Che Xiaoxiao Huang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT Key Laboratory of Advanced Structural‑Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264209People’s Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438People’s Republic of China

Polarization and conductance losses are the fundamental dielectric attenuation mechanisms for graphene-based absorbers, but it is not fully understood in revealing the loss mechanism of affect graphene itself. For the first time, the reduced graphene oxide(RGO) based absorbers are developed with regulatory absorption properties and the absorption mechanism of RGO is mainly originated from the carrier injection behavior of trace metal Fe nanosheets on graphene. Accordingly, the minimum reflection loss(RLmin) of Fe/RGO-2composite reaches-53.38 dB(2.45 mm), and the effective absorption bandwidth achieves 7.52 GHz(2.62 mm) with lower filling loading of 2 wt%. Using off-axis electron hologram testing combined with simulation calculation and carrier transport property experiments, we demonstrate here the carrier injection behavior from Fe to graphene at the interface and the induced charge accumulation and rearrangement, resulting in the increased interfacial and dipole polarization and the conductance loss. This work has confirmed that regulating the dielectric property of graphene itself by adding trace metals can not only ensure good impedance matching, but also fully exploit the dielectric loss ability of graphene at low filler content,which opens up an efficient way for designing lightweight absorbers and may be extended to other types materials.

关键词： Reduced graphene oxide Fe nanosheets Dielectric loss Electromagnetic wave absorption

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Strengthening strategy for high-performance friction stir lap welded joints based on 5083 Al alloy

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International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2498-2507页

作者： Yujia Shen Jijie Wang Beibei Wang Peng Xue Fengchao Liu Dingrui Ni Bolv Xiao Zongyi Ma College of Material Science and Engineering Shenyang Aerospace UniversityShenyang 110136China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Binzhou Institute of Technology Shandong Key Laboratory of Advanced Aluminium Materials and TechnologyWeiqiao-UCAS Science and Technology ParkBinzhou 256606China Centre of Excellence for Advanced Materials Dongguan 523808China

During aircraft,ship,and automobile manufacturing,lap structures are frequently produced among Al alloy skins,wall panels,and *** occurrence of welding defects severely decreases mechanical properties during friction stir lap welding(FSLW).This study focuses on investigating the effects of rotation rate,multipass welding,and cooling methods on lap defect formation,microstructural evolution,and mechanical *** defects were eliminated by decreasing welding speed,applying two-pass FLSW with a small welding tool,and introducing additional water cooling,thus leading to a remarkable increase in effective sheet thickness and lap *** above strategy yielded defect-free joints with an ultrafine-grained microstructure and increased tensile shear force from 298 to 551 N/*** fracture behavior of FSLW joints was systematically studied,and a fracture factor of lap joints was proposed to predict their fracture *** reducing the rotation rate,using two-pass welding,and employing additional water cooling strategies,an enlarged,strengthened,and defect-free lap zone with refined ultrafine grains was achieved with a quality comparable to that of lap welds based on 7xxx Al ***,this study provides a valuable FSLW method for eliminating hook defects and improving joint performance.

关键词： friction stir lap welding defect control microstructure fracture mechanisms mechanical properties

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A STUDY ON POSSIBILITY OF USING VR SPACE IN DESIGN EDUCATION (PART 2): VERIFICATION OF THE EFFECTIVENESS OF VR COMPARED TO 2D DRAWINGS AND 3DCAD BASED ON THE METHOD OF POINTING OUT ERROR OBJECTS

Journal of Environmental Engineering (Japan)

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Journal of Environmental Engineering (Japan) 2024年第823期89卷 514-525页

作者： Hou, Ning Nishina, Daisaku Nishii, Shunki Jiang, Rui Kindaichi, Sayaka Sugita, So Matsuura, Yasuaki Graduate School of Advanced Science and Engineering Hiroshima University Japan Faculty of Environmental Studies Hiroshima Institute of Technology Japan

In recent years, VR has attracted attention as a new method in architectural design. VR will be expected to understand a space more easily, and more useful for improving designers’ ability. In this study, we proposed an evaluation method by performing "pointing out error objects" task, in order to understand the educational effects of tools used in architectural design education objectively. Based on this, we examined the superiority at each content of design process, between VR to traditional tools such as 2D drawings and 3DCAD. © 2024 Architectural institute of Japan. All rights reserved.

关键词： Architectural design

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Linear Equalizer Effect-included Worst Eye Diagram Estimation Method for PCIe 6.0

Linear Equalizer Effect-included Worst Eye Diagram Estimatio...

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2024 IEEE International Symposium on Electromagnetic Compatibility, Signal and Power Integrity, EMC+SIPI 2024

作者： Lee, Seonghi Kim, Hyunwoong Ryu, Seunghun Kim, Jiseong Woo, Seongho Ahn, Seungyoung Korea Advanced Institute of Science and Technology Daejeon Korea Republic of

ISBN: (纸本)9798350360394

In this paper, linear equalizer effect-included eye estimation method was proposed for Peripheral component interconnect express (PCIe) Gen 6. To reflect the equalizer effect, the overall transfer function was calculated by combining the transfer function of the channel and the equalizer. The worst eye contour was predicted using the pulse amplitude modulation-4 (PAM-4) peak distortion analysis (PDA) method. For the verification, the feed forward equalizer (FFE) and continuous time linear equalizer (CTLE) were used. For channels, 9 channel cases with different loss values were assumed. The proposed method was compared with circuit simulation by eye diagram results and simulation time. The proposed method predicted the worst contours well, including the linear equalizer effect, and significantly reduced the simulation time, down to 93% faster, which is approximately 0.86 seconds. © 2024 IEEE.

关键词： Continuous time systems

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High-performance localized high-concentration electrolytes by diluent design for long-cycling lithium metal batteries

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Chinese Chemical Letters 2024年第4期35卷 244-247页

作者： Zhe Wang Li-Peng Hou Qian-Kui Zhang Nan Yao Aibing Chen Jia-Qi Huang Xue-Qiang Zhang College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China

Electrolyte design is essential for stabilizing lithium metal anodes and localized high-concentration electrolyte(LHCE) is a promising one. However, the state-of-the-art LHCE remains insufficient to ensure long-cycling lithium metal anodes. Herein, regulating the solvation structure of lithium ions in LHCE by weakening the solvating power of diluents is proposed for improving LHCE performance. A diluent,1,1,2,2,3,3,4,4-octafluoro-5-(1,1,2,2-tetrafluoroethoxy) pentane(OFE), with weaker solvating power is introduced to increase the proportion of aggregates(an anion interacts with more than two lithium ions,AGG-n) in electrolyte compared with the commonly used 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether(TTE). The decomposition of AGG-n in OFE-based LHCE intensifies the formation of anion-derived solid electrolyte interphase and improves the uniformity of lithium deposition. Lithium metal batteries with OFE-based LHCE deliver a superior lifespan of 190 cycles compared with 90 cycles of TTE-based LHCE under demanding conditions. Furthermore, a pouch cell with OFE-based LHCE delivers a specific energy of 417 Wh/kg and undergoes 49 cycles. This work provides guidance for designing high-performance electrolytes for lithium metal batteries.

关键词： Lithium metal anodes Electrolyte Diluents Solid electrolyte interphase Pouch cells

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Anti-aging performance improvement and enhanced combustion efficiency of boron via the coating of PDA

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Defence technology（防务技术） 2024年第3期33卷 399-410页

作者： Shuai Ma Qinghai Shu Mengyang Zhang Hongyu Huang Yansong Shi Xijuan Lv Shuai Zhao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(MOE) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing100081China Tangshan Research Institute of Beijing Institute of Technology Tangshan063000HebeiChina

Boron is an ambitious fuel in energetic materials since its high heat release values,but its application is prohibited by low combustion efficiency and oxidization during *** polydopamine(PDA)was introduced into boron particles,investigating the impact of PDA content on the energetic behavior of *** results indicated that the PDA coating formed a fishing net structure on the surface of boron *** heat release results showed that the combustion calorific value of B@PDA was higher than that of the raw ***,the actual combustion heat of boron powder in B@10%PDA increased by 38.08%.Meanwhile,the DSC peak temperature decreased by 100.65℃under similar oxidation rate compared to raw ***,the B@PDA@AP and B@AP composites were prepared,and their combustion properties were *** was demonstrated that B@10%PDA@AP exhibited superior performance in terms of peak pressure and burning time,*** peak pressure is 12.43 kPa more than B@AP and burning time is 2.22 times higher than B@***,the coating of PDA effectively inhibits the oxidization of boron during storage and enhances the energetic behavior of boron and corresponding composites.

关键词： Boron particles Polydopamine Anti-aging performance improvement Heat release

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Electronic perturbation of Cu nanowire surfaces with functionalized graphdiyne for enhanced CO2 reduction reaction

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National science Review 2024年第12期11卷 28-37页

作者： Haiyuan Zou Dongfang Cheng Chao Tang Wen Luo Huatian Xiong Hongliang Dong Fan Li Tao Song Siyan Shu Hao Dai Ziang Cui Zhouguang Lu Lele Duan Department of Chemistry Southern University of Science and Technology Department of Chemical and Biomolecular Engineering University of California Los Angeles Department of Materials Science and Engineering Southern University of Science and Technology Center of Artificial Photosynthesis for Solar Fuels and Department of Chemistry School of Science Westlake University Center for High-Pressure Science and Technology Advanced Research Department of Chemistry Tsinghua University Division of Solar Energy Conversion and Catalysis at Westlake University Zhejiang Baima Lake Laboratory Co. Ltd Institute of Natural Sciences Westlake Institute for Advanced Study

Electronic perturbation of the surfaces of Cu catalysts is crucial for optimizing electrochemical CO2reduction activity, yet still poses great challenges. Herein, nanostructured Cu nanowires（NW） with fine-tuned surface electronic structure are achieved via surface encapsulation with electron-withdrawing（–F） and-donating（–Me） group-functionalized graphdiynes（R-GDY, R = –F and –Me） and the resulting catalysts, denoted as R-GDY/Cu NW, display distinct CO2reduction performances. In situ electrochemical spectroscopy revealed that the *CO（a key intermediate of the CO2reduction reaction） binding affinity and consequent *CO coverage positively correlate with the Cu surface oxidation state, leading to favorable C–C coupling on F-GDY/Cu NW over Me-GDY/Cu NW. Electrochemical measurements corroborate the favorable C2H4production with an optimum C2+selectivity of 73.15% ± 2.5% observed for F-GDY/Cu NW, while the predominant CH4production is favored by Me-GDY/Cu NW. Furthermore, by leveraging the *Cu–hydroxyl（OH）/*CO ratio as a descriptor, mechanistic investigation reveals that the protonation of distinct adsorbed *CO facilitated by *Cu–OH is crucial for the selective generation of C2H4and CH4on F-GDY/Cu NW and Me-GDY/Cu NW, respectively.

关键词： CO reduction reaction copper nanowire group-functionalized graphdiyne surface electronic perturbation

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3.1 A PVT-Insensitive Sub-Ranging Current Reference Achieving 11.4ppm/°C from -20°C to 125°C

3.1 A PVT-Insensitive Sub-Ranging Current Reference Achievin...

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2024 IEEE International Solid-State Circuits Conference, ISSCC 2024

作者： Park, Pangi Lee, Junghyup Cho, Seonghwan Korea Advanced Institute of Science and Technology Daejeon Korea Republic of Daegu Gyeongbuk Institute of Science and Technology Daegu Korea Republic of

ISBN: (纸本)9798350306200

Improving the temperature stability of the reference current (IREF) is essential for the reliable operation of precision electronics for various applications, including automotive and industrial sensors. There are several approaches to generate a temperature-stable IREF, which include a weighted sum of PTAT and CTAT currents, dividing a reference voltage by a resistor with a similar temperature coefficient (TC) [1-3], and biasing a MOSFET at its zero-temperature-coefficient bias point [4]. While these techniques can remove the first-order TC, the remaining curvature due to the second-order TC limits the achievable temperature stability. In [5], the curvature in a reference current is corrected by using a curvature-corrected bandgap reference voltage and a switched capacitor resistor. However, it requires a stable and bulky reference oscillator (e.g., crystal). © 2024 IEEE.

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19.1 A 7.5GHz Subharmonic Injection-Locked Clock Multiplier with a 62.5MHz Reference, -259.7dB FoMJ, and -56.6dBc Reference Spur

19.1 A 7.5GHz Subharmonic Injection-Locked Clock Multiplier ...

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2024 IEEE International Solid-State Circuits Conference, ISSCC 2024

作者： Choi, Hangil Cho, Seonghwan Korea Advanced Institute of Science and Technology Daejeon Korea Republic of

ISBN: (纸本)9798350306200

Subharmonic injection locking (SIL) is a popular technique for low-jitter clock multipliers, as it can lower the phase noise of a VCO beyond what can be achieved by the PLL loop bandwidth. The amount of phase-noise reduction depends on the injection strength and reaches a maximum when the clock edge of the reference clock fully replaces that of the VCO [1]. However, one drawback of the SIL clock multiplier (SILCM) is the reference spur, which increases with the injection strength and the multiplication factor (N). For ring oscillator-based clock multipliers, the injection strength can be maximized by using a multiplying delay-locked loop (MDLL), which fully supplants the output clock edge by the reference. Since a ring oscillator has a square-wave-like waveform, a clock edge replacement causes little distortion to the waveform, and a seamless replacement of the edge is possible. Thus, the output spur can be mitigated by the precise control of the VCO frequency. For LC oscillators, however, a seamless replacement of the edge is not an easy task due to the sinusoidal nature of the LC tank as shown in Fig. 19.1.1. That is, while a strong injection strength lowers the phase noise, it introduces distortions to the waveform that persist for multiple periods, resulting in a large spur. A weak injection on the other hand can reduce the spur at the cost of larger phase noise. In prior works [2, 3], phase noise in LC-oscillator-based phase-locked loops (PLLs) was reduced by a strong injection, where the differential output of the oscillator is shorted to remove the accumulated noise in the LC tank. However, they achieve poor spur performance despite having a small multiplication factor (N=16) and calibration loops for injection timing. In [4], an MDLL was proposed for an LC VCO. Although it achieved improved phase noise performance with a large multiplication factor (N=128), a poor spur level was still the limiting factor in the overall jitter performance. While there have be

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