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67th International Annual meeting of the Human Factors and Ergonomics Society, HFES 2023

作者： Caine, Kelly Catchpole, Ken Sasangohar, Farzan Chen, Karen B. Hegde, Sudeep Souders, Dustin mcDonald, Anthony mcLaurin, Elease J. Clemson University School of Computing ClemsonSC United States Medical University of South Carolina Clinical Practice and Human Factors CharlestonSC United States Texas A&M University Industrial and Systems Engineering CentralSC United States North Carolina State University Edward P. Fitts Department of Industrial and Systems Engineering RaleighNC United States Clemson University Department of Industrial Engineering CentralSC United States Clemson University Psychology Department ClemsonSC United States University of Wisconsin-Madison Department of Industrial and Systems Engineering MadisonWI United States Oak Ridge Institute for Science & Education Fellowship Program Centers for Disease Control & Prevention PhiladelphiaPA United States

Postdoctoral training positions are becoming more common in the human factors and ergonomics (HFE) discipline. However, conversations related to training in the HFE discipline have largely focused on undergraduate and graduate education. This panel assembles both postdoctoral mentors and former trainees who collectively have a diverse set of HFE-related postdoctoral experiences. By panelists discussing their experiences, observations, and recommendations related to postdoctoral training with the audience, the panel session will support HFE faculty and students in making more informed decisions about if and how a postdoctoral experience (either as a mentor or trainee) could be a part of their career development in HFE. © 2023 Human Factors and Ergonomics Society.

关键词： education human factors mentorship postdoctoral training

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Block Copolymer Double Diamond Twin

arXiv

引用

arXiv 2022年

作者： Feng, Xueyan Dimitriyev, michael S. Thomas, Edwin L. Department of Materials Science and Engineering Texas A&M University College StationTX United States State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai China Department of Polymer Science and Engineering University of Massachusetts AmherstMA United States

A twin boundary (TB) is a common low energy planar defect in crystals including those with the atomic diamond structure (C, Si, Ge, etc.). We study twins in a self-assembled soft matter block copolymer (BCP) supramolecular crystal having the double diamond (DD) structure, consisting of 2 translationally shifted, interpenetrating diamond networks of the minority polydimethyl siloxane block embedded in a polystyrene block matrix. The coherent, low energy, mirror-symmetric double tubular network twin has one minority block network with its nodes offset from the (222) TB plane while nodes of the second network lie in the plane of the boundary. The offset network, although at a scale about a factor of 103 larger, has precisely the same geometry and symmetry as a (111) twin in atomic single diamond where the tetrahedral units spanning the TB retain nearly the same strut (bond) lengths and strut (bond) angles as in the normal unit cell. In the DD, the second minority block network undergoes a dramatic restructuring – the tetrahedral nodes transform into 2 new types of mirror-symmetric nodes (pentahedral and trihedral) which alternate and link to form a hexagonal mesh in the plane of the TB. The collective re-organization of the supramolecular packing highlights the hierarchical structure of ordered BCP phases and emphasizes the remarkable malleability of soft matter. © 2022, CC BY-NC-ND.

关键词： mirrors

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Effect of recycling agents on the homogeneity of high RAP binders 2

Effect of recycling agents on the homogeneity of high RAP bi...

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2nd International Conference on Advances in materials and Pavement Performance Prediction, Am3P 2020

作者： Abdelaziz, A. martin, A. Epps masad, E. Arámbula-mercado, E. Kaseer, F. Zachry Department of Civil and Environmental Engineering Texas A&M University TX United States Mechanical Engineering Program Texas A&M University at Qatar Doha Qatar Texas A&M Transportation Institute TX United States Florida Department of Transportation State Materials Office GainesvilleFL United States

ISBN: (纸本)9780367461690

Increased costs of virgin asphalt pavement materials have encouraged transportation agencies to allow higher quantities of reclaimed asphalt pavement (RAP) in their recycled asphalt mix design if performance can be maintained. Recycling agents or rejuvenators are organic materials used to reduce the stiffness and brittleness of RAP binders and make recycled mixtures less prone to cracking. Recycling agents can facilitate the use of higher quantities of RAP;however, there is limited understanding on their effect on the homogeneity of the final blend of virgin and recycled binders and recycling agent. This study utilized Atomic Force microscopy (AFm) to assess the effect of recycling agents on the homogeneity of different blends of virgin and RAP binders. AFm results revealed that the addition of recycling agents improved the homogeneity of blends at unaged and short-term aging conditions;however, this effect diminished after long-term aging. © 2021 Taylor & Francis Group, London.

关键词： Binders

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Sampled-Data Observer Design With Exponential Time-Varying Gains for Semilinear Parabolic PDE Systems

Sampled-Data Observer Design With Exponential Time-Varying G...

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2021 China Automation Congress, CAC 2021

作者： Wang, Zi-Peng Wu, Huai-Ning Li, Han-Xiong Huang, Tingwen Shen, Tao The School of Electrical Engineering University of Jinan Jinan250022 China The Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing100191 China The Department of Systems Engineering and Engineering Management City University of Hong Kong Hong Kong The Science Program Texas A&M University at Qatar Doha Qatar The HIT Robot Group Co. Ltd China

ISBN: (纸本)9781665426473

For semilinear parabolic PDE systems, the sampled-data observer (SDO) design under spatially point measurements (SPms) with exponential time-varying gains is concerned. On basis of a Lyapunov functional, a SDO with exponential time-varying gains under SPms via linear matrix inequalities is presented to guarantee the exponential stability of estimation error PDE system. Lastly, two numerical examples are provided to support the proposed SDO design approach. © 2021 IEEE

关键词： Linear matrix inequalities

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Large family of two-dimensional ferroelectric metals discovered via machine learning

引用

science Bulletin 2021年第3期66卷 233-242,M0003页

作者： Xing-Yu ma Hou-Yi Lyu Kuan-Rong Hao Yi-ming Zhao Xiaofeng Qian Qing-Bo Yan Gang Su School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Center of Materials Science and Optoelectronics Engineering College of Materials Science and Optoelectronic TechnologyUniversity of Chinese Academy of SciencesBeijing 100049China Department of Materials Science and Engineering College of Engineering and College of ScienceTexas A&M UniversityCollege StationTX 77843USA Kavli Institute for Theoretical Sciences and CAS Center for Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijing 100190China

Ferroelectricity and metallicity are usually believed not to coexist because conducting electrons would screen out static internal electric *** 1965,Anderson and Blount proposed the concept of"ferroelectric metal",however,it is only until recently that very rare ferroelectric metals were ***,by combining high-throughput ab initio calculations and data-driven machine learning method with new electronic orbital based descriptors,we systematically investigated a large family(2964)of two-dimensional(2D)bimetal phosphates,and discovered 60 stable ferroelectrics with out-of-plane polarization,including 16 ferroelectric metals and 44 ferroelectric semiconductors that contain seven *** ferroelectricity origins from spontaneous symmetry breaking induced by the opposite displacements of bimetal atoms,and the full-d-orbital coinage metal elements cause larger displacements and polarization than other *** 2D ferroelectric metals,the odd electrons per unit cell without spin polarization may lead to a half-filled energy band around Fermi level and is responsible for the *** is revealed that the conducting electrons mainly move on a single-side surface of the 2D layer,while both the ionic and electric contributions to polarization come from the other side and are vertical to the above layer,thereby causing the coexistence of metallicity and *** der Waals heterostructures based on ferroelectric metals may enable the change of Schottky barrier height or the Schottky-Ohmic contact type and induce a dramatic change of their vertical transport *** work greatly expands the family of 2D ferroelectric metals and will spur further exploration of 2D ferroelectric metals.

关键词： Ferroelectric metal 2D ferroelectricity multiferroics Ab initio calculations machine learning

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Effect of Twin Schmid Factor on the Tension Twinning Activities in a Highly Textured mg-3Al-1Zn

SSRN

引用

SSRN 2021年

作者： Zhao, Dexin Dong, Jiaqi Xie, Kelvin Y. Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States

We investigated the effect of twin Schmid factor on the tension twinning of individual grains in deformed textured mg-3Al-1Zn samples. The samples were deformed to ~3% strain (normal-direction compression and tension, rolling-direction compression and tension, and 45 o compression). Statistical analyses on the electron backscatter diffraction results revealed tension twinning generally obeys the Schmid law for individual grains, regardless of whether the global stress state favors tension twinning or not. The strong dependence of tension twinning on Schmid factor is in contrast to the reported weak correlation of dislocations and Schmid factor in the same material system. Such observations are anticipated to advance the understanding of the Schmid factor effect on the deformation behavior of polycrystalline mg alloys. © 2021, The Authors. All rights reserved.

关键词： Textures

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Best of both worlds: Synergistically derived material properties via additive manufacturing of nanocomposites

arXiv

引用

arXiv 2022年

作者： Carrola, mia Asadi, Amir Zhang, Han Papageorgiou, Dimitrios G. Bilotti, Emiliano Koerner, Hilmar Manufacturing and Mechanical Engineering Technology Department of Engineering Technology and Industrial Distribution Texas A&M University College StationTX77843-3367 United States Department of Materials Science and Engineering Texas A&M University College StationTX77843-3367 United States School of Engineering and Materials Science Queen Mary University of London Mile End Road LondonE1 4NS United Kingdom Materials & Manufacturing Directorate Air Force Research Laboratory WPAFB OH45430 United States

With an exponential rise in the popularity and availability of additive manufacturing (Am), a large focus has been directed towards research in this topic’s movement, while trying to distinguish themselves from similar works by simply adding nanomaterials to their process. Though nanomaterials can add impressive properties to nanocomposites (NCs), there are expansive amounts of opportunities that are left unexplored by simply combining Am with NCs without discovering synergistic effects and novel emerging material properties that are not possible by each of these alone. Cooperative, evolving properties of NCs in Am can be investigated at the processing, morphological, and architectural levels. Each of these categories are studied as a function of the amplifying relationship between nanomaterials and Am, with each showing the systematically selected material and method to advance the material performance, explore emergent properties, as well as improve the Am process itself. Innovative, advanced materials are key to faster development cycles in disruptive technologies for bioengineering, defense, and transportation sectors. This is only possible by focusing on synergism and amplification within additive manufacturing of nanocomposites. © 2022, CC BY.

关键词： 3D printers

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Impacts of irradiation-induced nanostructure on phonon linewidths and thermal conductivity in U-Zr alloy

引用

Physical Review B 2023年第10期108卷 104318-104318页

作者： Hao ma Zilong Hua Amrita Sen Tiankai Yao matthew S. Bryan Ahmet Alatas Erika K. Nosal Saqeeb Adnan Enda Xiao Aaron French mukesh Bachhav Chris A. marianetti marat Khafizov Lin Shao Lingfeng He Janelle P. Wharry David H. Hurley michael E. manley Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei 230026 Anhui China Idaho National Laboratory Idaho Falls Idaho 83415 USA School of Materials Engineering Purdue University West Lafayette Indiana 47906 USA Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA Department of Mechanical and Aerospace Engineering The Ohio State University Columbus Ohio 43210 USA Department of Chemistry Columbia University New York 10027 USA Department of Nuclear Engineering Texas A&M University College Station Texas 77843 USA Department of Applied Physics and Applied Mathematics Columbia University New York 10027 USA

Ion irradiation can significantly change material properties. Thermal conductivity degradation of reactor fuel is detrimental to safety and efficiency—driving research on how irradiation impacts heat-carrying phonons. Here, we report the measurements of phonon dispersion and lifetimes (inverse linewidths) in freestanding irradiated crystals and reveal the relationship between thermal conductivity and proton irradiation induced nanostructures in UZr2.6 using inelastic x-ray scattering, electron microscopy, modulated thermoreflectance, and first-principles calculations. Irradiation results in more significant increases in phonon linewidths and decreased thermal conductivity in the basal plane than that along the c axis, decreasing thermal conductivity anisotropy. microscopy reveals that this results from irradiation induced nanoprecipitates and metastable phase separation. Surprisingly, irradiation leads to smaller phonon linewidths near some zone boundaries, which we attribute to irradiation induced short-range order.

关键词： Irradiation effects Phonons Thermal conductivity Density functional calculations Inelastic X-ray scattering Scanning transmission electron microscopy

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Stacking-Fault engineering in Refractory metal-Reinforced Cantor-Based multi-Principal Element Alloy

SSRN

引用

SSRN 2024年

作者： Singh, Prashant Trehern, William Vela, Brent Sharma, Prince Kirk, Tanner Pei, Zongrui Arroyave, Raymundo Gao, michael C. Johnson, Duane D. Ames National Laboratory U.S. Department of Energy Iowa State University AmesIA50011 United States National Energy Technology Laboratory 1450 Queen Ave SW AlbanyOR97321 United States Department of Materials Science & Engineering Texas A&M University College StationTX77843 United States Oak Ridge National Laboratory United States Department of Materials Science & Engineering Iowa State University AmesIA50011 United States Department of Mechanical Engineering and Mechanics

multi-principal-element alloys (mPEAs) based on 3d-transition metals show remarkable mechanical properties. The stacking fault energy (SFE) in face-centered cubic (fcc) alloys is a critical property that often controls underlying deformation mechanisms and mechanical response. Here, we present an exhaustive density-functional theory study on refractory- and copper-reinforced Cantor-based systems to ascertain the effects of refractory metal chemistry on SFE. We find that even a small percent change in refractory metal composition significantly changes SFEs, which correlates favorably with features like electronegativity variance, size effect, and heat of fusion. For fcc mPEAs, we also detail the changes in mechanical properties, such as bulk, Young’s, and shear moduli, as well as yield strength. A Labusch-type solute-solution-strengthening model was used to evaluate the temperature-dependent yield strength, which, combined with SFE, provides a design guide for high-performance alloys. We also analyzed the electronic structures of two down-selected alloys to reveal the underlying origin of optimal SFE and strength range in refractory-reinforced fcc mPEAs. These new insights on tuning SFEs and modifying composition-structure-property correlation in refractory- and copper-reinforced mPEAs by chemical disorder, provide a chemical route to tune twinning- and transformation-induced plasticity behavior in fcc mPEAs. © 2024, The Authors. All rights reserved.

关键词： Stacking faults

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Entropy-Driven melting Point Depression in fcc HEAs

SSRN

引用

SSRN 2021年

作者： Arroyave, Raymundo Kirk, Tanner Youseff, Khaled Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States Department of Mechanical Engineering Texas A&M University College StationTX77843 United States Department of Industrial and Systems Engineering Texas A&M University College StationTX77843 United States Qatar University Doha Qatar Department of Materials Science and Engineering

High Entropy Alloys (HEAs) are an increasingly dominant alloy design paradigm. The premise of entropic stabilization of single-phase alloys has motivated much of the research on HEAs. Chemical complexity may indeed help stabilize single alloy phases relative to other lower-entropy competing solid phases. Paradoxically, this complexity may de-stabilize these alloys against the liquid, potentially limiting the application space of HEAs at elevated temperatures. In this work, we carry out a comprehensive investigation of the phase stability in the fcc CoCrFemnNiVAl HEA space using a state of the art CALPHAD database. By using modern © 2021, The Authors. All rights reserved.

关键词： Entropy

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