Browsing FAS Scholarly Articles by Title
Now showing items 4182-4201 of 18292
-
Dopant clustering, electronic inhomogeneity, and vortex pinning in iron-based superconductors
(American Physical Society (APS), 2013)We use scanning tunneling microscopy to map the surface structure, nanoscale electronic inhomogeneity, and vitreous vortex phase in the hole-doped superconductor Sr0.75K0.25Fe2As2 with Tc=32 K. We find that the low-T cleaved ... -
Dopant Diffusion under Pressure and Stress
(Institute of Electrical & Electronics Engineers (IEEE), 2003)The effects of stress on equilibrium point defect populations and on dopant diffusion in strained semiconductors are reviewed. The thermodynamic relationships presented permit the direct comparison of hydrostatic and ... -
Doped Carbon Nanotube Networks for Electrochemical Filtration of Aqueous Phenol: Electrolyte Precipitation and Phenol Polymerization
(American Chemical Society (ACS), 2012)Electrochemical filtration with anodic carbon nanotube (CNT) networks is reported to be effective for chemical and microbiological water treatment. Here, we investigate how CNT doping affects the electrochemical filtration ... -
Doping by Metal-Mediated Epitaxy: Growth of As Delta-Doped Si through a Pb Monolayer
(American Institute of Physics, 2001)In molecular-beam epitaxy a monolayer of Pb on the Si(111) surface induces single-crystal growth at temperatures well below those required for similar growth on a bare surface. We demonstrate that the suppression of dopant ... -
Doppler Broadening of In-Flight Positron Annihilation Radiation due to Electron Momentum
(American Physical Society (APS), 2001)We report the first observation of electron momentum contributions to the Doppler broadening of radiation produced by in-flight two-photon annihilation in solids. In these experiments an approximately 2.5 MeV positron beam ... -
Dorsal and anal fin function in bluegill sunfish Lepomis macrochirus: three-dimensional kinematics during propulsion and maneuvering
(The Company of Biologists, 2005)Dorsal and anal fins are median fins located above and below the centre of mass of fishes, each having a moment arm relative to the longitudinal axis. Understanding the kinematics of dorsal and anal fins may elucidate how ... -
The dorsomedial striatum encodes net expected return, critical for energizing performance vigor
(2013)Decision making requires an actor to not only steer behavior towards specific goals, but also determine the optimal vigor of performance. Current research and models have largely focused on the former problem of how actions ... -
Dose-Dependent Mutation Rates Determine Optimum Erlotinib Dosing Strategies for EGFR Mutant Non-Small Cell Lung Cancer Patients
(Public Library of Science, 2015)Background: The advent of targeted therapy for cancer treatment has brought about a paradigm shift in the clinical management of human malignancies. Agents such as erlotinib used for EGFR-mutant non-small cell lung cancer ... -
The double cloak of invisibility: phenotypic plasticity and larval decoration in a geometrid moth,Synchlora frondaria, across three diet treatments
(Wiley-Blackwell, 2009)1. Crypsis is one of the main defences that insects use to avoid predators, and both the juveniles and adults of many geometrid moths are remarkable in their ability to blend into different host backgrounds. The larvae of ... -
Double DCO+ rings reveal CO ice desorption in the outer disk around IM Lup
(IOP Publishing, 2015)In a protoplanetary disk, a combination of thermal and non-thermal desorption processes regulate where volatiles are liberated from icy grain mantles into the gas phase. Non-thermal desorption should result in volatile-enriched ... -
Double Digest RADseq: An Inexpensive Method for De Novo SNP Discovery and Genotyping in Model and Non-Model Species
(Public Library of Science (PLoS), 2012)The ability to efficiently and accurately determine genotypes is a keystone technology in modern genetics, crucial to studies ranging from clinical diagnostics, to genotype-phenotype association, to reconstruction of ... -
Double Holliday junctions are intermediates of DNA break repair
(Nature Publishing Group, 2010)Repair of DNA double-strand breaks (DSBs) by homologous recombination is crucial for cell proliferation and tumour suppression. However, despite its importance, the molecular intermediates of mitotic DSB repair remain ... -
Double photoionization of atomic helium and its isoelectronic partners at x-ray energies
(American Physical Society, 1992)A simple and accurate procedure for calculating the rate of double photoionization of "two-electron" systems at very high photon energies is presented. Arguments are given to support the validity of the method used. In ... -
Double Quantum Dots in Carbon Nanotubes
(American Physical Society, 2010)We study the two-electron eigenspectrum of a carbon-nanotube double quantum dot with spin-orbit coupling. Exact calculations are combined with a simple model to provide an intuitive and accurate description of single-particle ... -
Double-Disk Dark Matter
(Elsevier BV, 2013)Based on observational tests of large scale structure and constraints on halo structure, dark matter is generally taken to be cold and essentially collisionless. On the other hand, given the large number of particles and ... -
The Double-Edged Sword of Pedagogy: Instruction Limits Spontaneous Exploration and Discovery
(Elsevier, 2011)Motivated by computational analyses, we look at how teaching affects exploration and discovery. In Experiment 1, we investigated children’s exploratory play after an adult pedagogically demonstrated a function of a toy, ... -
Double-peaked narrow-line signatures of dual supermassive black holes in galaxy merger simulations
(Oxford University Press (OUP), 2013)We present a first attempt to model the narrow-line (NL) region of active galactic nuclei (AGN) in hydrodynamic simulations of galaxy mergers, using a novel physical prescription. This model is used to determine the origin ... -
Doublon production rate in modulated optical lattices
(American Physical Society, 2012)We theoretically study lattice modulation experiments with ultracold fermions in optical lattices. We focus on the regime relevant to current experiments when interaction strength is larger than the bandwidth and temperature ... -
Doushantuo Embryos Preserved Inside Diapause Egg Cysts
(Nature Publishing Group, 2007)Phosphatized microfossils in the Ediacaran (635 - 542 Myr ago) Doushantuo Formation, south China, have been interpreted as the embryos of early animals. Despite experimental demonstration that embryos can be preserved, ... -
Doushantuo-Type Microfossils From Latest Ediacaran Phosphorites of Northern Mongolia
(Geological Society of America, 2017-10-19)Phosphorites of the latest Ediacaran upper Khesen Formation in the Khuvsgul Group of northern Mongolia preserve a newly discovered, three-dimensionally phosphatized Doushantuo-type microfossil assemblage. Eight genera ...