198 research outputs found
The Large Enriched Germanium Experiment for Neutrinoless Double Beta Decay (LEGEND)
The observation of neutrinoless double-beta decay (0)
would show that lepton number is violated, reveal that neutrinos are Majorana
particles, and provide information on neutrino mass. A discovery-capable
experiment covering the inverted ordering region, with effective Majorana
neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with
excellent energy resolution and extremely low backgrounds, at the level of
0.1 count /(FWHMtyr) in the region of the signal. The
current generation Ge experiments GERDA and the MAJORANA DEMONSTRATOR
utilizing high purity Germanium detectors with an intrinsic energy resolution
of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in
the 0 signal region of all 0
experiments. Building on this success, the LEGEND collaboration has been formed
to pursue a tonne-scale Ge experiment. The collaboration aims to develop
a phased 0 experimental program with discovery potential
at a half-life approaching or at years, using existing resources as
appropriate to expedite physics results.Comment: Proceedings of the MEDEX'17 meeting (Prague, May 29 - June 2, 2017
Freestanding Non-Precious Metal Electrocatalysts for Oxygen Evolution and Reduction Reactions
Chemical sensors based on polymer composites with carbon nanotubes and graphene: the role of the polymer
Photonic hydrogel sensors
Analyte-sensitive hydrogels that incorporate optical structures have emerged as sensing platforms for point-of-care diagnostics. The optical properties of the hydrogel sensors can be rationally designed and fabricated through self-assembly, microfabrication or laser writing. The advantages of photonic hydrogel sensors over conventional assay formats include label-free, quantitative, reusable, and continuous measurement capability that can be integrated with equipment-free text or image display. This Review explains the operation principles of photonic hydrogel sensors, presents syntheses of stimuli-responsive polymers, and provides an overview of qualitative and quantitative readout technologies. Applications in clinical samples are discussed, and potential future directions are identified
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Adopting the Standard Halo Model (SHM) of an isotropic Maxwellian velocity
distribution for dark matter (DM) particles in the Galaxy, the most stringent
current constraints on their spin-dependent scattering cross-section with
nucleons come from the IceCube neutrino observatory and the PICO-60 CF
superheated bubble chamber experiments. The former is sensitive to high energy
neutrinos from the self-annihilation of DM particles captured in the Sun, while
the latter looks for nuclear recoil events from DM scattering off nucleons.
Although slower DM particles are more likely to be captured by the Sun, the
faster ones are more likely to be detected by PICO. Recent N-body simulations
suggest significant deviations from the SHM for the smooth halo component of
the DM, while observations hint at a dominant fraction of the local DM being in
substructures. We use the method of Ferrer et al. (2015) to exploit the
complementarity between the two approaches and derive conservative constraints
on DM-nucleon scattering. Our results constrain (6 ) at
C.L. for a DM particle of mass 1~TeV annihilating into () with a local density of . The constraints scale inversely with and are
independent of the DM velocity distribution.Comment: 9 pages, 3 figures, 1 table. To appear in Eur.Phys.J.
A fuzzy derivative approach to classification of outcomes from the ADRAC database
The Australian Adverse Drug Reaction Advisory Committee (ADRAC) database has been collected and maintained by the Therapeutic Goods Administration. In this paper we study a part of his database (Card2) which contains records having just reactions from the Cardiovascular group. Drug-reaction relationships are presented by a vector of degrees which shows the degree of association of a drug with each class of reactions. In this work we examine these relationships in the classification of reaction outcomes. A modified version of the fuzzy derivative method (FDM2) is used for classification.C
Microwave absorption of polymer nanocomposites on the base high-density polyethylene and magnetite nanoparticles
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