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  • 1
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    I2 basal stacking fault as a degradation mechanism in reverse gate-biased AlGaN/GaN HEMTs (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-09-30
    Description: Here, we present the observation of a bias-induced, degradation-enhancing defect process in plasma-assisted molecular beam epitaxy grown reverse gate-biased AlGaN/GaN high electron mobility transistors (HEMTs), which is compatible with the current theoretical framework of HEMT degradation. Specifically, we utilize both conventional transmission electron microscopy and aberration-corrected transmission electron microscopy to analyze microstructural changes in not only high strained regions in degraded AlGaN/GaN HEMTs but also the extended gate-drain access region. We find a complex defect structure containing an I 2 basal stacking fault and offer a potential mechanism for device degradation based on this defect structure. This work supports the reality of multiple failure mechanisms during device operation and identifies a defect potentially involved with device degradation.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    Topographic perturbations of regional stresses and consequent bedrock fracturing (1996)
    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 101, no. 2, pp. 25,523-25,536, pp. L24308, (ISSN: 1340-4202)
    Details
    Publication Date: 1996
    Keywords: Stress ; Fracture ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    State-dependent rotations of spins by weak measurements (2011)
    American Physical Society (APS)
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    Publication Date: 2011-03-31
    Description: Author(s): D. J. Miller It is shown that a weak measurement of a quantum system produces a new state of the quantum system which depends on the prior state, as well as the (uncontrollable) measured position of the pointer variable of the weak-measurement apparatus. The result imposes a constraint on hidden-variable theorie... [Phys. Rev. A 83, 032121] Published Wed Mar 30, 2011
    Keywords: Fundamental concepts
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Alternative experimental protocol to demonstrate the Pusey-Barrett-Rudolph theorem (2013)
    American Physical Society (APS)
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    Publication Date: 2013-01-17
    Description: Author(s): D. J. Miller Pusey, Barrett, and Rudolph (PBR) have recently proven an important new theorem in the foundations of quantum mechanics [Pusey et al. , Nature Phys. 8 475 (2012) ]. Here we propose alternative experimental protocols which lead to the PBR result for a special case and a weaker PBR-like result general... [Phys. Rev. A 87, 014103] Published Wed Jan 16, 2013
    Keywords: Fundamental concepts
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Oxidation of Pt(111) under Near-Ambient Conditions (2011)
    American Physical Society (APS)
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    Publication Date: 2011-11-05
    Description: Author(s): D. J. Miller, H. Öberg, S. Kaya, H. Sanchez Casalongue, D. Friebel, T. Anniyev, H. Ogasawara, H. Bluhm, L. G. M. Pettersson, and A. Nilsson [Phys. Rev. Lett. 107, 195502] Published Fri Nov 04, 2011
    Keywords: Condensed Matter: Structure, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    LHC signatures of the constrained exceptional supersymmetric standard model (2011)
    American Physical Society (APS)
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    Publication Date: 2011-09-09
    Description: Author(s): P. Athron, S. F. King, D. J. Miller, S. Moretti, and R. Nevzorov We discuss two striking Large Hadron Collider (LHC) signatures of the constrained version of the exceptional supersymmetric standard model, based on a universal high-energy soft scalar mass m 0 , soft trilinear coupling A 0 and soft gaugino mass M 1/2 . The first signature we discuss is that of light exo... [Phys. Rev. D 84, 055006] Published Thu Sep 08, 2011
    Keywords: Beyond the standard model
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid-Atlantic Ridge 30°N (2011)
    Wiley
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    Publication Date: 2011-07-19
    Description: Expeditions 304 and 305 of the Integrated Ocean Drilling Program cored and logged a 1.4 km section of the domal core of Atlantis Massif. Postdrilling research results summarized here constrain the structure and lithology of the Central Dome of this oceanic core complex. The dominantly gabbroic sequence recovered contrasts with predrilling predictions; application of the ground truth in subsequent geophysical processing has produced self-consistent models for the Central Dome. The presence of many thin interfingered petrologic units indicates that the intrusions forming the domal core were emplaced over a minimum of 100–220 kyr, and not as a single magma pulse. Isotopic and mineralogical alteration is intense in the upper 100 m but decreases in intensity with depth. Below 800 m, alteration is restricted to narrow zones surrounding faults, veins, igneous contacts, and to an interval of locally intense serpentinization in olivine-rich troctolite. Hydration of the lithosphere occurred over the complete range of temperature conditions from granulite to zeolite facies, but was predominantly in the amphibolite and greenschist range. Deformation of the sequence was remarkably localized, despite paleomagnetic indications that the dome has undergone at least 45° rotation, presumably during unroofing via detachment faulting. Both the deformation pattern and the lithology contrast with what is known from seafloor studies on the adjacent Southern Ridge of the massif. There, the detachment capping the domal core deformed a 100 m thick zone and serpentinized peridotite comprises ∼70% of recovered samples. We develop a working model of the evolution of Atlantis Massif over the past 2 Myr, outlining several stages that could explain the observed similarities and differences between the Central Dome and the Southern Ridge.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 8
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    Vibrational excitation through tug-of-war inelastic collisions (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-07-04
    Description: Vibrationally inelastic scattering is a fundamental collision process that converts some of the kinetic energy of the colliding partners into vibrational excitation(,). The conventional wisdom is that collisions with high impact parameters (where the partners only 'graze' each other) are forward scattered and essentially elastic, whereas collisions with low impact parameters transfer a large amount of energy into vibrations and are mainly back scattered. Here we report experimental observations of exactly the opposite behaviour for the simplest and most studied of all neutral-neutral collisions: we find that the inelastic scattering process H + D(2)(v = 0, j = 0, 2) --〉 H + D(2)(v' = 3, j' = 0, 2, 4, 6, 8) leads dominantly to forward scattering (v and j respectively refer to the vibrational and rotational quantum numbers of the D(2) molecule). Quasi-classical trajectory calculations show that the vibrational excitation is caused by extension, not compression, of the D-D bond through interaction with the passing H atom. However, the H-D interaction never becomes strong enough for capture of the H atom before it departs with diminished kinetic energy; that is, the inelastic scattering process is essentially a frustrated reaction in which the collision typically excites the outward-going half of the H-D-D symmetric stretch before the H-D(2) complex dissociates. We suggest that this 'tug of war' between H and D(2) is a new mechanism for vibrational excitation that should play a role in all neutral-neutral collisions where strong attraction can develop between the collision partners.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Greaves, Stuart J -- Wrede, Eckart -- Goldberg, Noah T -- Zhang, Jianyang -- Miller, Daniel J -- Zare, Richard N -- England -- Nature. 2008 Jul 3;454(7200):88-91. doi: 10.1038/nature07079.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laser Chemistry, Spectroscopy and Dynamics Group, School of Chemistry, University of Bristol, Bristol BS8 1TS, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18596807" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 9
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    Distributions of microbial activities in deep subseafloor sediments (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-25
    Description: Diverse microbial communities and numerous energy-yielding activities occur in deeply buried sediments of the eastern Pacific Ocean. Distributions of metabolic activities often deviate from the standard model. Rates of activities, cell concentrations, and populations of cultured bacteria vary consistently from one subseafloor environment to another. Net rates of major activities principally rely on electron acceptors and electron donors from the photosynthetic surface world. At open-ocean sites, nitrate and oxygen are supplied to the deepest sedimentary communities through the underlying basaltic aquifer. In turn, these sedimentary communities may supply dissolved electron donors and nutrients to the underlying crustal biosphere.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉D'Hondt, Steven -- Jorgensen, Bo Barker -- Miller, D Jay -- Batzke, Anja -- Blake, Ruth -- Cragg, Barry A -- Cypionka, Heribert -- Dickens, Gerald R -- Ferdelman, Timothy -- Hinrichs, Kai-Uwe -- Holm, Nils G -- Mitterer, Richard -- Spivack, Arthur -- Wang, Guizhi -- Bekins, Barbara -- Engelen, Bert -- Ford, Kathryn -- Gettemy, Glen -- Rutherford, Scott D -- Sass, Henrik -- Skilbeck, C Gregory -- Aiello, Ivano W -- Guerin, Gilles -- House, Christopher H -- Inagaki, Fumio -- Meister, Patrick -- Naehr, Thomas -- Niitsuma, Sachiko -- Parkes, R John -- Schippers, Axel -- Smith, David C -- Teske, Andreas -- Wiegel, Juergen -- Padilla, Christian Naranjo -- Acosta, Juana Luz Solis -- New York, N.Y. -- Science. 2004 Dec 24;306(5705):2216-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ocean Drilling Program Leg 201 Shipboard Scientific Party, NASA Astrobiology Institute, University of Rhode Island Graduate School of Oceanography, South Ferry Road, Narragansett, RI 02882, USA. dhondt@gso.uri.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15618510" target="_blank"〉PubMed〈/a〉
    Keywords: Bacteria/growth & development/isolation & purification/*metabolism ; Carbon/metabolism ; Colony Count, Microbial ; *Ecosystem ; Electron Transport ; Geologic Sediments/*microbiology ; Iron/metabolism ; Manganese/metabolism ; Methane/metabolism ; Nitrates/metabolism ; Oxidants/metabolism ; Oxidation-Reduction ; Pacific Ocean ; Peru ; Photosynthesis ; Seawater/chemistry ; Sulfates/metabolism ; Thermodynamics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Using the Acropora digitifera genome to understand coral responses to environmental change (2011)
    Nature Publishing Group (NPG)
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    Publication Date: 2011-07-26
    Description: Despite the enormous ecological and economic importance of coral reefs, the keystone organisms in their establishment, the scleractinian corals, increasingly face a range of anthropogenic challenges including ocean acidification and seawater temperature rise. To understand better the molecular mechanisms underlying coral biology, here we decoded the approximately 420-megabase genome of Acropora digitifera using next-generation sequencing technology. This genome contains approximately 23,700 gene models. Molecular phylogenetics indicate that the coral and the sea anemone Nematostella vectensis diverged approximately 500 million years ago, considerably earlier than the time over which modern corals are represented in the fossil record ( approximately 240 million years ago). Despite the long evolutionary history of the endosymbiosis, no evidence was found for horizontal transfer of genes from symbiont to host. However, unlike several other corals, Acropora seems to lack an enzyme essential for cysteine biosynthesis, implying dependency of this coral on its symbionts for this amino acid. Corals inhabit environments where they are frequently exposed to high levels of solar radiation, and analysis of the Acropora genome data indicates that the coral host can independently carry out de novo synthesis of mycosporine-like amino acids, which are potent ultraviolet-protective compounds. In addition, the coral innate immunity repertoire is notably more complex than that of the sea anemone, indicating that some of these genes may have roles in symbiosis or coloniality. A number of genes with putative roles in calcification were identified, and several of these are restricted to corals. The coral genome provides a platform for understanding the molecular basis of symbiosis and responses to environmental changes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shinzato, Chuya -- Shoguchi, Eiichi -- Kawashima, Takeshi -- Hamada, Mayuko -- Hisata, Kanako -- Tanaka, Makiko -- Fujie, Manabu -- Fujiwara, Mayuki -- Koyanagi, Ryo -- Ikuta, Tetsuro -- Fujiyama, Asao -- Miller, David J -- Satoh, Nori -- England -- Nature. 2011 Jul 24;476(7360):320-3. doi: 10.1038/nature10249.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Marine Genomics Unit, Okinawa Institute of Science and Technology Promotion Corporation, Onna, Okinawa 904-0412, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21785439" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anthozoa/chemistry/*genetics/immunology/*physiology ; *Climate Change ; Coral Reefs ; Cyclohexylamines ; Cystathionine beta-Synthase/genetics ; Cysteine/biosynthesis ; DNA Damage/genetics/radiation effects ; Fossils ; Genome/*genetics ; Glycine/analogs & derivatives/biosynthesis ; Molecular Sequence Data ; Phylogeny ; Protein Structure, Tertiary ; Sea Anemones/genetics/immunology ; Symbiosis/genetics ; Ultraviolet Rays
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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