1,030 research outputs found
Dual field alignment display and control for electron micropattern generator
Application of electron beam lithography to replace photolithography process in fabrication of integrated circuits is discussed. Procedure for using electron beam lithography equipment is described. Diagram of electron micropattern generator is provided
Some Air Oxidation Products of DI-2-Ethylhexyl Sebacate
Author Institution: Department of Chemistry, The Ohio State University, Columbus 1
Is our Sun a Singleton?
Most stars are formed in a cluster or association, where the number density
of stars can be high. This means that a large fraction of initially-single
stars will undergo close encounters with other stars and/or exchange into
binaries. We describe how such close encounters and exchange encounters can
affect the properties of a planetary system around a single star. We define a
singleton as a single star which has never suffered close encounters with other
stars or spent time within a binary system. It may be that planetary systems
similar to our own solar system can only survive around singletons. Close
encounters or the presence of a stellar companion will perturb the planetary
system, often leaving planets on tighter and more eccentric orbits. Thus
planetary systems which initially resembled our own solar system may later more
closely resemble some of the observed exoplanet systems.Comment: 2 pages, 1 figure. To be published in the proceedings of IAUS246
"Dynamical Evolution of Dense Stellar Systems". Editors: E. Vesperini (Chief
Editor), M. Giersz, A. Sill
Ultrabroadband Density of States of Amorphous In-Ga-Zn-O
The sub-gap density of states of amorphous indium gallium zinc oxide
(-IGZO) is obtained using the ultrabroadband photoconduction (UBPC) response
of thin-film transistors (TFTs). Density functional theory simulations classify
the origin of the measured sub-gap density of states peaks as a series of
donor-like oxygen vacancy states and acceptor-like Zn vacancy states. Donor
peaks are found both near the conduction band and deep in the sub-gap, with
peak densities of cmeV. Two deep acceptor-like
metal vacancy peaks with peak densities in the range of
cmeV and lie adjacent to the valance band Urbach tail region at
2.0 to 2.5 eV below the conduction band edge. By applying detailed charge
balance, we show increasing the density of metal vacancy deep-acceptors
strongly shifts the -IGZO TFT threshold voltage to more positive values.
Photoionization (h > 2.0 eV) of metal vacancy acceptors is one cause of
transfer curve hysteresis in -IGZO TFTs owing to longer recombination
lifetimes as they get captured into acceptor-like vacancies.Comment: 31 pages, 5 figures, supplementary section include
A Search for Multi-Planet Systems Using the Hobby-Eberly Telescope
Extrasolar multiple-planet systems provide valuable opportunities for testing
theories of planet formation and evolution. The architectures of the known
multiple-planet systems demonstrate a fascinating level of diversity, which
motivates the search for additional examples of such systems in order to better
constrain their formation and dynamical histories. Here we describe a
comprehensive investigation of 22 planetary systems in an effort to answer
three questions: 1) Are there additional planets? 2) Where could additional
planets reside in stable orbits? and 3) What limits can these observations
place on such objects? We find no evidence for additional bodies in any of
these systems; indeed, these new data do not support three previously announced
planets (HD 20367b: Udry et al. 2003, HD 74156d: Bean et al. 2008, and 47 UMa
c: Fischer et al. 2002). The dynamical simulations show that nearly all of the
22 systems have large regions in which additional planets could exist in stable
orbits. The detection-limit computations indicate that this study is sensitive
to close-in Neptune-mass planets for most of the systems targeted. We conclude
with a discussion on the implications of these non-detections.Comment: Accepted to ApJS. Includes 39 pages of radial-velocity data table
Plasma wave echo experiment
Experimental observation of a new nonlinear plasma phenomenon, the plasma wave echo, is reported
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