检索结果-内蒙古大学图书馆

Deceleration performance and stopping distance of hybrid composite brake lining pads of basalt and clam shell

AIP Conference Proceedings 2023年第1期2568卷

作者： I. Ketut Adi Atmika I. Gusti Agung Kade Suriadi I. Nyoman Sutantra I. Dewa Gede Ary Subagia 1)Mechanical Engineering Department of Udayana University Street of Bukit Jimbaran Bali 80361 Indonesia 3)Technology and Material Research Center of Udayana University Street of Bukit Jimbaran Bali 80361 Indonesia 4)Doctoral Program of Engineering Science Engineering Faculty of Udayana University Street of PB Sudirman Bali 80114 Indonesia 2)Mechanical Engineering Department of Institut of Sepuluh Nopember Surabaya 60111 Indonesia

Brake lining is one of the components of the braking system on a vehicle that plays an important role for the safety of the driver. Recently, the development of brake lining materials has attracted the attention of many researchers. At first many brake pads were made of asbestos as the main material, but this brake lining material has begun to be abandoned because it has a negative impact on health and the environment. This paper presents the results of research on the development of a hybrid composite as a brake lining material. This hybrid composite is composed of the main ingredients of basalt and green clam shell waste, as well as a small amount of alumina with phenolic resin as a binder. Hybrid composite brake lining material is made through a sintering process with an emphasis of 2 tons for 30 minutes at a constant temperature of 150°C. Hybrid composite brake pads made 3 variations of weight fraction were tested on a motorcycle to see the performance of deceleration and braking distance. Also tested brake lining with asbestos material as a comparison. The lowest deceleration performance was asbestos brake lining at 6.79 m/s2, while the highest deceleration was HC4 brake lining (35% basalt-15% clam shell) of 11.51 m/s2. While the shortest braking distance is HC4 brake pads (35% basalt-15% shell) of 3.02 meters, while the longest braking distance of asbestos is 15.18 meters. The increase in the percentage of basalt content and the decrease in the percentage of clam shell content indicate a tendency to increase the magnitude of deceleration, and a tendency to decrease the braking distance for each vehicle's initial speed.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Resistive Switching Early Failure and Gap Identification in Bilayer Selectorless RRAM Applications

Resistive Switching Early Failure and Gap Identification in ...

引用

2019 Device Research Conference, DRC 2019

作者： Chen, Ying-Chen Hu, Szu- Tung Lin, Chao-Cheng Lee, Jack C. University of Texas at Austin Department of Electrical and Computer Engineering AustinTX United States Material Science and Engineering Program University of Texas at Austin AustinTX78712 United States Taiwan Semiconductor Research Institute TSRI Hsinchu Taiwan

ISBN: (纸本)9781728121123

Resistive random access memory (RRAM) using various metal oxides (i.e., SiO[1], HfO, NiO[2], AlO, TaO5 etc.) have attracted a great attention since the current nonvolatile memory (NVM) has been approaching the scaling limits. However, the sneak path current (SPC) is a main problem in crossbar memory configuration. The SPC significantly affects the read/write operation, because each word line is connected in perpendicular directions to the word line where the interference current from neighbor cells cannot be avoided in the crossbar configurations. In order to suppress the sneak path current in the array application, the transistor, diode, or selector device is designed to be integrated next to the memory cell for reducing the SPC. However, the additional selector device in the socalled 1T-1R or 1S-1R architecture (Fig. 1(a)) increases the cell size, process complexity, and cost. Therefore, the self-rectifying behavior i.e. nonlinear resistive switching (RS) in a 1R-only selectorless RRAM cell has been proposed [3]-[6]. However, the mechanisms in nonlinear characteristic and reliability properties are not yet been investigated. This work studies the reliability of early failure and relaxation properties using gap identification method. © 2019 IEEE.

关键词： Hafnium oxides

来源：评论

学校读者我要写书评

暂无评论

Phase Transformations, Microstructural Refinement and Defect Evolution Mechanisms in Al-Si Alloys under Non-Hydrostatic Diamond Anvil Cell Compression

SSRN

引用

SSRN 2020年

作者： Liu, Tingkun Olszta, Matthew Gwalani, Bharat Park, Changyong Mathaudhu, Suveen Devaraj, Arun Physical and Computational Science Directorate Pacific Northwest National Laboratory Energy and Environment Directorate Pacific Northwest National Laboratory High Pressure Collaborative Access Team X-ray Science Division Argonne National Laboratory Material Science and Engineering Program University of California Riverside Mechanical Engineering Department University of California Riverside

Non-hydrostatic compression of materials using a diamond anvil cell (DAC) can transform equilibrium microstructure of an alloy to novel, potentially metastable states. In this study, in situ synchrotron X-ray diffraction (XRD) during compression up to 24 GPa and subsequent ex situ, high resolution analytical electron microscopy (AEM) after decompression of an Al-Si alloy provided insight into the crystallographic changes during the compression as well as microstructural refinement, and defect structures caused by such a high pressure compression-decompression process. Pressure resolved in-situ synchrotron XRD was used to detail the phase transformation pathway of the eutectic Si phase in Al-Si alloy, from Si-I → Si-XI → Si-V during compression, and a final transformation predominantly to Si-III after decompression. Using scanning and transmission electron microscopy (S/TEM), site specific analysis of the alloy immediately underneath the anvil contact surface demonstrated a highly complex microstructure. A narrow region of thick amorphous Al oxide interspersed with nanocrystalline grains was found at the top surface. Underneath this Al oxide, while the majority the eutectic Si was transformed into highly-deformed, polycrystalline (PC) Si-III, a complex intermediate layer was discovered at the interface between Al and Si, comprised of a small fraction of Al nanocrystals and a majority of nanocrystalline Si-I. This combination of pressure resolved in-situ synchrotron XRD coupled with subsequent high resolution, electron microscopy resolved the phase transformation as well as non-equilibrium microstructures in a metallic alloy induced by a non-hydrostatic high pressure compression followed by decompression. © 2020, The Authors. All rights reserved.

关键词： Silicon alloys

来源：评论

学校读者我要写书评

暂无评论

Metallic vs. Semiconducting properties of quasi-one-dimensional tantalum selenide van der Waals nanoribbons

arXiv

引用

arXiv 2021年

作者： Kargar, Fariborz Krayev, Andrey Wurch, Michelle Ghafouri, Yassamin Debnath, Topojit Wickramaratne, Darshana Salguero, Tina T. Lake, Roger Bartels, Ludwig Balandin, Alexander A. Center Department of Electrical and Computer Engineering University of California RiversideCA92521 United States HORIBA Scientific NovatoCA94949 United States Department of Chemistry and Material Science and Engineering Program University of California RiversideCA92521 United States Department of Chemistry University of Georgia AthensGA30602 United States Laboratory for Terahertz and Terascale Electronics Department of Electrical and Computer Engineering University of California RiversideCA92521 United States Center for Computational Materials Science U.S. Naval Research Laboratory WashingtonDC20375 United States

We conducted a tip-enhanced Raman scattering spectroscopy (TERS) and photoluminescence (PL) study of quasi-1D TaSe3-δ nanoribbons exfoliated onto gold substrates. At a selenium deficiency of δ~0.25 (Se/Ta=2.75,), the nanoribbons exhibit a strong, broad PL peak centered around ~920 nm (1.35 eV), suggesting their semiconducting behavior. Such nanoribbons revealed a strong TERS response under 785-nm laser excitation, allowing for their nanoscale spectroscopic imaging. Nanoribbons with a smaller selenium deficiency (Se/Ta=2.85, δ~0.15) did not show any PL or TERS response. The confocal Raman spectra of these samples agree with the previously-reported spectra of metallic TaSe3. The differences in the optical response of the nanoribbons examined in this study suggest that even small variations in Se content can induce changes in electronic structure, causing samples to exhibit either metallic or semiconducting character. The temperature-dependent electrical measurements of devices fabricated with both types of materials corroborate these observations. The density-functional-theory calculations revealed that incorporation of an oxygen atom in a Se vacancy can result in band gap opening and thus enable the transition from a metal to a semiconductor. However, the predicted bandgap is substantially smaller than that derived from PL data. These results indicate that the properties of van der Waals materials can vary significantly depending on stoichiometry, defect types and concentration, and possibly environmental and substrate effects. In view of this finding, local probing of nanoribbon properties with TERS becomes essential to understanding such low-dimensional systems. Copyright © 2021, The Authors. All rights reserved.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

Measurement and analysis of thermal conductivity of ceramic particle beds for solar thermal energy storage

arXiv

引用

arXiv 2021年

作者： Chung, Ka Man Zeng, Jian Adapa, Sarath Reddy Feng, Tianshi Bagepalli, Malavika V. Loutzenhiser, Peter G. Albrecht, Kevin J. Ho, Clifford K. Chen, Renkun Material Science and Engineering Program University of California San Diego San DiegoCA92093 United States Department of Mechanical and Aerospace Engineering University of California San Diego San DiegoCA92093 United States George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA30332-0405 United States Concentrating Solar Technologies Department Sandia National Laboratories 1515 Eubank Blvd. SE AlbuquerqueNM87123 United States

A systematic study was performed to measure the effective thermal conductivity of ceramic particle beds, a promising heat transfer and thermal energy storage media for concentrating solar power (CSP). The thermal conductivity of the ceramic particle beds was measured using a transient hot-wire (THW) method within a temperature range of room temperature to 700 oC, the target operating temperature of the next-generation CSP systems. Two different types of ceramic particles were examined: (1) CARBOBEAD HSP 40/70 and (2) CARBOBEAD CP 40/100 with the average particle sizes of ~ 400 μm and ~280 μm, respectively, and thermal conductivities ranging from ~0.25 W m-1 K-1 to ~0.50 W m-1 K-1 from 20 oC to 700 oC in both air and N2 gas. The gaseous pressure dependence of the thermal conductivity of the ceramic particle beds was also studied in the N2 environment to differentiate the contributions from gas conduction, solid conduction, and radiation. Calculations using the Zehner, Bauer, and Schlünder (ZBS) model showed good agreements with the measurements. Based on the model, it is concluded that the effective thermal conductivity of the packed particle beds is dominated by the gas conduction while the solid conduction and radiation contributes to about 20% of the effective thermal conductivity at high temperature. Copyright © 2021, The Authors. All rights reserved.

关键词： Heat storage

来源：评论

学校读者我要写书评

暂无评论

Detection of uncompensated magnetization at the interface of an epitaxial antiferromagnetic insulator

引用

Physical Review B 2020年第17期102卷 174406-174406页

作者： Pavel N. Lapa Min-Han Lee Igor V. Roshchin Kirill D. Belashchenko Ivan K. Schuller Department of Physics University of California San Diego La Jolla California 92093 USA Materials Science and Engineering Program University of California San Diego La Jolla California 92093 USA Department of Material Science and Engineering Texas A&M University College Station Texas 77843-4242 USA Department of Physics and Astronomy and Nebraska Center of Materials and Nanoscience University of Nebraska–Lincoln Lincoln Nebraska 68588-0299 USA

We have probed directly the temperature and magnetic field dependence of pinned uncompensated magnetization at the interface of antiferromagnetic FeF2 with Cu, using FeF2−Cu−Co spin valves. Electrons polarized by the Co layer are scattered by the pinned uncompensated moments at the FeF2−Cu interface giving rise to giant magnetoresistance. We determined the direction and magnitude of the pinned uncompensated magnetization at different magnetic fields and temperatures using the angular dependencies of resistance. The strong FeF2 anisotropy pins the uncompensated magnetization along the easy axis independent of the cooling field orientation. Most interestingly, magnetic fields as high as 90 kOe cannot break the pinning at the FeF2−Cu interface. This proves that the pinned interfacial magnetization is strongly coupled to the antiferromagnetic order inside the bulk FeF2 layer. Studies as a function of FeF2 crystalline orientation show that uncompensated spins are only detected in a spin valve with (110) crystal orientation, but not in valves containing FeF2(100) and FeF2(001). This observation is in agreement with symmetry-related considerations which predict the equilibrium boundary magnetization for the FeF2(110) layer.

关键词： Antiferromagnetism Giant magnetoresistance Magnetotransport Spintronics Interfaces Spin valves T-symmetry

来源：评论

学校读者我要写书评

暂无评论

Localization transition in three-dimensional stealthy hyperuniform disordered systems

arXiv

引用

arXiv 2021年

作者： Sgrignuoli, F. Torquato, S. Dal Negro, L. Department of Electrical and Computer Engineering & Photonics Center Boston University 8 Saint Mary’s Street BostonMA02215 United States Department of Chemistry Department of Physics Princeton Institute for the Science and Technology of Materials Program in Applied and Computational Mathematics Princeton University PrincetonNJ08540 United States Division of Material Science and Engineering Boston University 15 Saint Mary’s Street BrooklineMA02446 United States Department of Physics Boston University 590 Commonwealth Avenue BostonMA02215 United States

The purpose of this work is to understand the fundamental connection between structural correlations and light localization in three-dimensional (3D) open scattering systems of finite size. We numerically investigate the transport of vector electromagnetic waves scattered by resonant electric dipoles spatially arranged in 3D space by stealthy hyperuniform disordered point patterns. Three-dimensional stealthy hyperuniform disordered systems (3D-SHDS) are engineered with different structural correlation properties determined by their degree of stealthiness χ. Such fine control of exotic states of amorphous matter enables the systematic design of optical media that interpolate in a tunable fashion between uncorrelated random structures and crystalline materials. By solving the electromagnetic multiple scattering problem using Green’s matrix spectral method, we establish a transport phase diagram that demonstrates a clear delocalization-localization transition beyond a critical scattering density that depends on χ. The transition is characterized by studying the Thouless number and the spectral statistics of the scattering resonances. In particular, by tuning the χ parameter, we demonstrate large spectral gaps and suppressed sub-radiant proximity resonances, facilitating light localization. Moreover, consistently with previous studies, our results show a region of the transport phase diagram where the investigated scattering systems become transparent. Our work provides a systematic description of the transport and localization properties of light in stealthy hyperuniform structures and motivates the engineering of novel photonic systems with enhanced light-matter interactions for applications to both classical and quantum devices. Copyright © 2021, The Authors. All rights reserved.

关键词： Phase diagrams

来源：评论

学校读者我要写书评

暂无评论

Terahertz cavity magnon polaritons

arXiv

引用

arXiv 2023年

作者： Kritzell, T. Elijah Baydin, Andrey Tay, Fuyang Rodriguez, Rodolfo Nojiri, Hiroyuki Everitt, Henry O. Barsukov, Igor Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Physics and Astronomy University of California RiversideCA92521 United States Institute for Materials Research Tohoku University Sendai980-8577 Japan DEVCOM Army Research Laboratory-South HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

Hybrid light-matter coupled states, or polaritons, in magnetic materials have attracted significant attention due to their potential for enabling novel applications in spintronics and quantum information processing. However, most studies to date have been carried out for ferromagnetic materials with magnon excitations at gigahertz frequencies. Here, we have investigated strong resonant photon-magnon coupling at frequencies above 1 terahertz for the first time in a prototypical room-temperature antiferromagnetic insulator, NiO, inside a Fabry-Pérot cavity. The cavity was formed by the crystal itself when it was thinned down to an optimized thickness. By using terahertz time-domain spectroscopy in high magnetic fields up to 25 T, we swept the magnon frequency through Fabry-Pérot cavity modes and observed photon-magnon anticrossing behavior, demonstrating clear vacuum Rabi splittings exceeding the polariton linewidths. These results show that NiO is a promising platform for exploring antiferromagnetic spintronics and cavity magnonics in the terahertz frequency range. Copyright © 2023, The Authors. All rights reserved.

关键词： Polariton

来源：评论

学校读者我要写书评

暂无评论

Concurrent operando neutron imaging and diffraction analysis revealing spatial lithiation phase evolution in an ultra-thick graphite electrode

arXiv

引用

arXiv 2024年

作者： Strobl, Markus Baur, Monica E. Samothraktis, Stavros Malamud, Florencia Zhang, Xiaolong Tung, Patrick K.M. Schmidt, Søren Woracek, R. Lee, J. Kiyanagi, Ryoji Kuhn, Luise Theil Segev, Inbal Gavish Ein-Eli, Yair PSI Center for Neutron and Muon Sciences Villigen5232 Switzerland Niels Bohr Institut University of Copenhagen Denmark Department of Energy Conversion and Storage Technical University of Denmark Kongens LyngbyDK-2800 Denmark Research Technology Services [ResTech UNSW Sydney Kensington2052 Australia DMSC European Spallation Source Lyngby Denmark European Spallation Source P.O. Box 176 LundS - 221 00 Sweden J-PARC Center Japan Atomic Energy Agency Tokai319-1195 Japan Soreq Nuclear Research Center [SNRC Yavne Israel Department of Material Science and Engineering Technion Israel Institute of Technology Haifa3200003 Israel Grand Technion Energy Program [GTEP Technion Haifa3200003 Israel Israel National Institute for Energy Storage [INIES Technion Haifa3200003 Israel

Energy efficient, safe and reliable Li-ion batteries (LIBs) are required for a wide range of applications. Charging capabilities of thick electrodes still holding their stored high-energy is a most desirable characteristic in future advanced LIBs. The introduction of ultra-thick graphite anode meets limitations in internal electrode transport properties, leading to Li-ion gradients with detrimental consequences for battery cell performance and lifetime. Yet, there is a lack of experimental tools capable of providing a complete view of local processes and evolving gradients within such thick electrodes. Here, we introduce a multi-modal operando measurement approach, enabling quantitative spatio-temporal observations of Li concentrations and intercalation phases in ultra-thick, graphite electrodes. Neutron imaging and diffraction concurrently provide correlated information from the macroscopic scale of the cell and electrode down to the crystallographic scale portraying the intercalation and deintercalation processes. In particular, the evolving formation of the solid electrolyte interphase (SEI), observation of gradients in total lithium content, as well as in the formation of ordered LixC6 phases and trapped lithium have been mapped throughout the first charge-discharge cycle of the cell. Different lithiation stages co-exist during charging and discharging of an ultra-thick composite graphite-based electrode;delayed lithiation and delithiation processes are observed at the central region of the electrode, while the SEI formation, potential plating and dead lithium are predominantly found closer to the interface with the separator. The study furthermore emphasizes the potential of the method to study Li ion diffusion and the kinetics of lithiation phase formation in advanced ultra-thick electrodes. Specifically, the relation of dead Li and SEI formation to the different Li phase stages can be mapped. Copyright © 2024, The Authors. All rights reserved.

关键词： Solid electrolytes

来源：评论

学校读者我要写书评

暂无评论

Real-time 3D analysis during electron tomography using tomviz

arXiv

引用

arXiv 2022年

作者： Schwartz, Jonathan Harris, Chris Pietryga, Jacob Zheng, Huihuo Kumar, Prashant Visheratina, Anastasiia Kotov, Nicholas A. Major, Brianna Avery, Patrick Ercius, Peter Ayachit, Utkarsh Geveci, Berk Muller, David A. Genova, Alessandro Jiang, Yi Hanwell, Marcus Hovden, Robert Department of Material Science and Engineering University of Michigan Ann ArborMI United States Kitware Inc Clifton ParkNY United States Argonne Leadership Computing Facility Argonne National Laboratory LemontIL United States Department of Chemical Engineering University of Michigan Ann ArborMI United States The Molecular Foundry Lawrence Berkeley National Laboratory BerkeleyCA United States School of Applied and Engineering Physics Cornell University IthacaNY United States Advanced Photon Source Argonne National Laboratory LemontIL United States National Synchrotron Light Source II Brookhaven National Laboratory UptonNY United States Applied Physics Program University of Michigan Ann ArborMI United States

The demand for high-throughput electron tomography is rapidly increasing in biological and material sciences. However, this 3D imaging technique is computationally bottlenecked by alignment and reconstruction which runs from hours to days. We demonstrate real-time tomography with dynamic 3D tomographic visualization to enable rapid interpretation of specimen structure immediately as data is collected on an electron microscope. Using geometrically complex chiral nanoparticles, we show volumetric interpretation can begin in less than 10minutes and a high-quality tomogram is available within 30 minutes. Real-time tomography is integrated into tomviz, an opensource and cross-platform 3D data analysis tool that contains intuitive graphical user interfaces (GUI), to enable any scientist to characterize biological and material structure in 3D. © 2022, CC BY.

关键词： Graphical user interfaces

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：