2,313 research outputs found
Solid state television camera system Patent
Solid state television camera system consisting of monolithic semiconductor mosaic sensor and molecular digital readout system
Rotating Boson Stars and Q-Balls
We consider axially symmetric, rotating boson stars. Their flat space limits
represent spinning Q-balls. We discuss their properties and determine their
domain of existence. Q-balls and boson stars are stationary solutions and exist
only in a limited frequency range. The coupling to gravity gives rise to a
spiral-like frequency dependence of the boson stars. We address the flat space
limit and the limit of strong gravitational coupling. For comparison we also
determine the properties of spherically symmetric Q-balls and boson stars.Comment: 22 pages, 18 figure
One pot synthesis of a stable and cost effective silver particle free ink for inkjet printed flexible electronics
Silver particle free inks display immense superiority and potential over silver nanoparticle based inks in the aspect of synthesis, flexibility and low temperature processing, which has attracted considerable research interest as an alternative for fabricating conductive structures in recent years. Although recent research on silver particle free inks has led to beneficial results, there are still some drawbacks some of the inks are chemically unstable and hence are not suitable for industrial inkjet printing process, although they have good conductivity; while others are cheap in terms of raw material costs but are complicated to make due to the complex synthetic route or using hazardous procedures, or are not compatible with inkjet printing. Therefore, it will be advantageous to develop a stable, cheap and inkjet printable silver particle free ink using a simple synthetic procedure. Alcohols are favorable solvents for silver particle free inks that can provide the ink with essential fluid properties for inkjet printing. However, they have some negative effects on the ink performance due to their physicochemical properties, which should be avoided. In this work, a simple do it yourself silver particle free ink is presented, which shows high chemical stability, low cost and good printability. The ink is formulated via a simple silver oxalate precursor route in alcohols. The fluid property, thermal property, stability and electrical performance of the inks based on different alcohols were investigated and optimized to obtain the final ink for printing on glass and flexible polyimide substrates. The printed Ag features yielded a resistivity of 15.46 amp; 956; amp; 937; cm at a sintering temperature of 180 C, which is equivalent to 10 times bulk silver. Based on a comprehensive assessment, we can offer a low cost, easy to make, reliable and highly competitive ink for flexible printed electronic
Repairing Socially Aggregated Ontologies Using Axiom Weakening
Ontologies represent principled, formalised descriptions of agents’ conceptualisations of a domain. For a community of agents, these descriptions may differ among agents. We propose an aggregative view of the integration of ontologies based on Judgement Aggregation (JA). Agents may vote on statements of the ontologies, and we aim at constructing a collective, integrated ontology, that reflects the individual conceptualisations as much as possible. As several results in JA show, many attractive and widely used aggregation procedures are prone to return inconsistent collective ontologies. We propose to solve the possible inconsistencies in the collective ontology by applying suitable weakenings of axioms that cause inconsistencies
Averaged Solvent Embedding Potential Parameters for Multiscale Modeling of Molecular Properties
Published version available in
J. Chem. Theory Comput., 2016, 12 (4), pp 1684–1695. We derive and validate averaged solvent parameters for embedding potentials to be
used in polarizable embedding quantum mechanics/molecular mechanics (QM/MM) molecular property
calculations of solutes in organic solvents. The parameters are solvent-specific atom-centered
partial charges and isotropic polarizabilities averaged over a large number of geometries of
solvent molecules. The use of averaged parameters
reduces the computational cost to obtain the embedding potential, which can otherwise be a rate-limiting step in calculations involving large environments. The parameters are evaluated
by analyzing the quality of the resulting molecular electrostatic potentials with respect to full
QM potentials. We show that a combination of geometry-specific parameters for solvent molecules
close to the QM region and averaged parameters for solvent molecules further away allows for
efficient polarizable embedding multiscale modeling without compromising the accuracy. The results
are promising for the de- velopment of general embedding parameters for biomolecules, where the
reduction in
computational cost can be considerable
Characterising WIMPs at a future Linear Collider
We investigate the prospects for detecting and measuring the parameters of
WIMP dark matter in a model independent way at the International Linear
Collider. The signal under study is direct WIMP pair production with associated
initial state radiation . The analysis
accounts for the beam energy spectrum of the ILC and the dominant machine
induced backgrounds. The influence of the detector parameters are incorporated
by full simulation and event reconstruction within the framework of the ILD
detector concept. We show that by using polarised beams, the detection
potential is significantly increased by reduction of the dominant SM background
of radiative neutrino production . The
dominant sources of systematic uncertainty are the precision of the
polarisation measurement and the shape of the beam energy spectrum. With an
integrated luminosity of 500 fb the helicity structure of the interaction
involved can be inferred, and the masses and cross-sections can be measured
with a relative accuracy of the order of 1 %.Comment: 20 pages, 11 figure
Large and Almost Maximal Neutrino Mixing within the Type II See-Saw Mechanism
Within the type II see-saw mechanism the light neutrino mass matrix is given
by a sum of a direct (or triplet) mass term and the conventional (type I)
see-saw term. Both versions of the see-saw mechanism explain naturally small
neutrino masses, but the type II scenario offers interesting additional
possibilities to explain large or almost maximal or vanishing mixings which are
discussed in this paper. We first introduce ``type II enhancement'' of neutrino
mixing, where moderate cancellations between the two terms can lead to large
neutrino mixing even if all individual mass matrices and terms generate small
mixing. However, nearly maximal or vanishing mixings are not naturally
explained in this way, unless there is a certain initial structure (symmetry)
which enforces certain elements of the matrices to be identical or related in a
special way. We therefore assume that the leading structure of the neutrino
mass matrix is the triplet term and corresponds to zero U_{e3} and maximal
theta_{23}. Small but necessary corrections are generated by the conventional
see-saw term. Then we assume that one of the two terms corresponds to an
extreme mixing scenario, such as bimaximal or tri-bimaximal mixing. Deviations
from this scheme are introduced by the second term. One can mimic Quark-Lepton
Complementarity in this way. Finally, we note that the neutrino mass matrix for
tri-bimaximal mixing can be -- depending on the mass hierarchy -- written as a
sum of two terms with simple structure. Their origin could be the two terms of
type II see-saw.Comment: 25 pages. Comments and references added, to appear in JHE
Dapagliflozin Monotherapy in Type 2 Diabetic Patients With Inadequate Glycemic Control by Diet and Exercise: A randomized, double-blind, placebo-controlled, phase 3 trial
OBJECTIVE - Dapagliflozin, a highly selective inhibitor of the renal sodium-glucose co-transporter-2, increases urinary excretion of glucose and lowers plasma glucose levels in an insulin-independent manner. We evaluated the efficacy and safety of dapagliflozin in treatment-naive patients with type 2 diabetes. RESEARCH DESIGN AND METHODS - This was a 24-week parallel-group, double-blind, placebo-controlled phase 3 trial. Patients with A1C 7.0-10% (n = 485) were randomly assigned to one of seven arms to receive once-daily placebo or 2.5, 5, or 10 mg dapagliflozin once daily in the morning (main cohort) or evening (exploratory cohort). Patients with A1C 10.1-12% (high-A1C exploratory cohort, it n=73) were randomly assigned 1:1 to receive blinded treatment with a morning close of 5 or 10 mg/day dapagliflozin. The primary end point was change from baseline in A1C in the main cohort, statistically tested using an ANCOVA. RESULTS - In the main cohort, mean A1C changes from baseline at week 24 were -0.23% with placebo and -0.58, -0.77 (P = 0.0005 vs. placebo), and -0.89% (P < 0.0001, vs. placebo) with 2.5, 5, and 10 mg dapagliflozin, respectively. Signs, symptoms, and other reports suggestive of urinary tract infections and genital infection were more frequently noted in the dapagliflozin arms. There were no major episodes of hypoglycemia. Data from exploratory cohorts were consistent with these results. CONCLUSIONS - Dapagliflozin lowered hyperglycemia in treatment-naive patients with newly diagnosed type 2 diabetes. The near absence of hypoglycemia and an insulin-independent mechanism of action make dapagliflozin a unique addition to existing treatment options for type 2 diabetes
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