2,455 research outputs found
Data and Code for Goddard et al 2023 – SAI and Antarctica (2)
No full textThese repositories (1-5) contain the HIST (199001-200912), SSP245 (205001-206912), and Global+1.0 (205001-206912) data and code (Jupyter notebooks .ipynb) needed to run the analysis in Goddard et al. 2023 - The impacts of Stratospheric Aerosol Injection on Antarctic ice loss depend on injection location. For questions and other SAI experimental data please contact the corresponding author
Data and Code for Goddard et al 2023 – SAI and Antarctica (1)
No full textThese repositories (1-5) contain the HIST (199001-200912), SSP245 (205001-206912), and Global+1.0 (205001-206912) data and code (Jupyter notebooks .ipynb) needed to run the analysis in Goddard et al. 2023 - The impacts of Stratospheric Aerosol Injection on Antarctic ice loss depend on injection location. For questions and other SAI experimental data please contact the corresponding author
Efficiency of pi-pi tunneling in [2]rotaxane molecular electronic switches
No full textWe perform large-scale density functional and matrix Green's function calculations, and study the coherent charge tunneling properties of molecular electronic devices based on the central part of [2]rotaxane molecules. We extract molecular core regions from realistic monolayer configurations with folded molecular structures and sandwich them between Au(111) electrodes to form device models. We show that the electrical switching behavior can be observed within the pi-pi stacked serial arrangement of redox-active components in the [2]rotaxane monolayer as with the parallel arrangement in the [2]catenane case. We thus demonstrate the effectiveness of the pi-pi electron tunneling and the universality of the switching mechanism based on the energetic movement of frontier orbitals accompanying the conformational switching. In addition, via considering the energetic ordering of highest-occupied molecular orbital (HOMO) and HOMO-1 levels that originated from tetrathiafulvalene and dioxynaphthalene in several ground-state conformation device models, we show that the molecule-electrode configurations critically affect the device functionality
First-principles study of charge transport across alkene thiolate self-assembled monolayers
No full textCarrying out first-principles density-functional and matrix-Green's function calculations, we study the electron tunneling through self-assembled monolayers (SAMs) of conjugated n-alkene chains (n = 8, 12, 16, and 30) bridged to Au(lll) electrodes via monothiolate and dithiolate contacts. In contrast to the semiconducting behavior of bulk polyacetylenes, we do not find any current decay up to 30-alkene chain length. Comparing tiholate and dithiolate cases, we observe only a small difference in their resistance (ratio of 2.8), or minor dependence of charge transport characteristics on the contacts. We thus predict that ideal nanoscale alkene chains can be a good wire component for molecular electronics
Possible performance improvement in [2]catenane molecular electronic switches
No full textMechanically interlocked bistable supramolecular complexes are promising candidates of molecular electronics. Applying a multiscale computational approach, here we study the coherent charge transport properties of catenane monolayers sandwiched between Cu(111) electrodes. We demonstrate the robust nature of electrical switching behavior with respect to the variations in the monolayer packing density and the type of electrodes, as well as the thermal fluctuations of the molecules. We propose that the asymmetry of molecule-electrode barriers can be utilized to improve the switching ratio.(c) 2006 American Institute of Physics
Liquid Penetrant Testing at Goddard Space Flight Center
No full textAn overview of liquid penetrant testing at Goddard Space Flight Center and an introduction of the author to the NASA Engineering and Safety Center Nondestructive Evaluation Technical Discipline Team is provided, including author biography, an overview of NASA spaceflight customers and their applications, a high-level description of research and development initiatives, two case-studies of flight project applications, and an introduction to the rest of the Goddard Space Flight Center Nondestructive Evaluation team and their respective roles in the organization
Toward efficient electrochemical conversion of CO2: catalyst design accelerated by simulation-based screening
No full textDr. Henry Goddard Leach Visits Spanish Class
No full textDr. Henry Goddard Leach, author and speaker, stands looking over students in the Spanish Class at Jacksonville State College. Shown from left are Helen Smith, Dora Miranda, Dr. Leach, and Jacques Corman. (circa March 14, 1954)https://digitalcommons.jsu.edu/lib-ac-histimg/2974/thumbnail.jp
Encounters with Frank Siebert
No full textIves Goddard, Curator of the Department of Anthropology of the National Museum of Natural History, Smithsonian Institution, is the author of “Eastern Algonquian Languages, in The Handbook of North American Indians, Vol. 15. He co-authored, with Kathleen f. Bragdon, Native Writings n Massachusetts and more recently edited The Handbook Of North American Indians, Vol. 17, Languages
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