915 research outputs found
A case control study to evaluate the role of genetic and environmental risk factor in development and progression of osteoarthritis knee
Development of Advanced Hybrid, Nano-Sized, Brine Sludge Impregnated MWCNT Composite Material Useful for Broad Application Spectrum
A novel microwave irradiated process has been developed for the synthesis of advanced hybrid, nano-sized, functionalized, brine sludge impregnated MWCNT composite material useful for broad application spectrum. MWCNTs and brine sludge are mainly used as raw materials and are heated in flask using microwave synthesizer in the temperature range of 50-60 ºC for the duration of 20- 25 minutes. Brine sludge act as a novel agent wherein simultaneously and synergistically in-situ funtionization of MWCNTs takes place and therefore enabling synthesis of dark grey colored advanced hybrid, nano-sized, functionalized, brine sludge impregnated MWCNT composite material useful for broad application spectrum. The synthesized advance material has been characterized by various complementary techniques namely XRD, FTIR, FESEM and EDXA. FESEM study reveals the increase in the thickness of the MWCNT wall thereby confirms the brine sludge impregnation on MWCNT. The applications of synthesized material lie in the area such as radiation shielding materials, hybrid polymeric materials to advanced chemically designed composite (ACDC) materials useful for broad application spectrum
297 IS RADIOLOGY A DETERMINANT OF PAIN, STIFFNESS AND FUNCTIONAL DISABILITY IN KNEE OSTEOARTHRITIS?
Ability of fullerene to accumulate hydrogen
In the present paper, using a modification of the LJ-potential and the continuum approach, we define С60-H2 (He) potentials, as well as interaction energy of two fullerene particles. The proposed approach allows to calculate interactions between carbon structures of any character (wavy graphenes, nanotubes, etc.). The obtained results allowed to localize global sorption zones both inside the particle and on the outer surface of the fullerene
First measurement of the Head-Tail directional nuclear recoil signature at energies relevant to WIMP dark matter searches
We present first evidence for the so-called Head-Tail asymmetry signature of
neutron-induced nuclear recoil tracks at energies down to 1.5 keV/amu using the
1m^3 DRIFT-IIc dark matter detector. This regime is appropriate for recoils
induced by Weakly Interacting Massive Particle (WIMPs) but one where the
differential ionization is poorly understood. We show that the distribution of
recoil energies and directions induced here by Cf-252 neutrons matches well
that expected from massive WIMPs. The results open a powerful new means of
searching for a galactic signature from WIMPs.Comment: 4 pages, 6 figures, 1 tabl
Low Energy Electron and Nuclear Recoil Thresholds in the DRIFT-II Negative Ion TPC for Dark Matter Searches
Understanding the ability to measure and discriminate particle events at the
lowest possible energy is an essential requirement in developing new
experiments to search for weakly interacting massive particle (WIMP) dark
matter. In this paper we detail an assessment of the potential sensitivity
below 10 keV in the 1 m^3 DRIFT-II directionally sensitive, low pressure,
negative ion time projection chamber (NITPC), based on event-by-event track
reconstruction and calorimetry in the multiwire proportional chamber (MWPC)
readout. By application of a digital smoothing polynomial it is shown that the
detector is sensitive to sulfur and carbon recoils down to 2.9 and 1.9 keV
respectively, and 1.2 keV for electron induced events. The energy sensitivity
is demonstrated through the 5.9 keV gamma spectrum of 55Fe, where the energy
resolution is sufficient to identify the escape peak. The effect a lower energy
sensitivity on the WIMP exclusion limit is demonstrated. In addition to recoil
direction reconstruction for WIMP searches this sensitivity suggests new
prospects for applications also in KK axion searches
First Results from the DRIFT-IIa Dark Matter Detector
Data from the DRIFT-IIa directional dark matter experiment are presented,
collected during a near continuous 6 month running period. A detailed
calibration analysis comparing data from gamma-ray, x-ray and neutron sources
to a GEANT4 Monte Carlo simulations reveals an efficiency for detection of
neutron induced recoils of 94+/-2(stat.)+/-5(sys.)%. Software-based cuts,
designed to remove non-nuclear recoil events, are shown to reject 60Co
gamma-rays with a rejection factor of better than 8x10-6 for all energies above
threshold. An unexpected event population has been discovered and is shown here
to be due to the alpha-decay of 222Rn daughter nuclei that have attached to the
central cathode. A limit on the flux of neutrons in the Boulby Underground
Laboratory is derived from analysis of unshielded and shielded data.Comment: 43 pages, 14 figures, submitted to Astroparticle Physic
The Hawaii Infrared Parallax Program. VI. The Fundamental Properties of 1000+ Ultracool Dwarfs and Planetary-mass Objects Using Optical to Mid-IR SEDs and Comparison to BT-Settl and ATMO 2020 Model Atmospheres
We derive the bolometric luminosities () of 865 field-age
and 189 young ultracool dwarfs (spectral types M6-T9, including 40 new
discoveries presented here) by directly integrating flux-calibrated optical to
mid-IR spectral energy distributions (SEDs). The SEDs consist of low-resolution
( 150) near-IR (0.8-2.5 m) spectra (including new spectra for 97
objects), optical photometry from the Pan-STARRS1 survey, and mid-IR photometry
from the CatWISE2020 survey and Spitzer/IRAC. Our
calculations benefit from recent advances in parallaxes from Gaia, Spitzer, and
UKIRT, as well as new parallaxes for 19 objects from CFHT and Pan-STARRS1
presented here. Coupling our measurements with a new uniform
age analysis for all objects, we estimate substellar masses, radii, surface
gravities, and effective temperatures () using evolutionary
models. We construct empirical relationships for and
as functions of spectral type and absolute magnitude,
determine bolometric corrections in optical and infrared bandpasses, and study
the correlation between evolutionary model-derived surface gravities and
near-IR gravity classes. Our sample enables a detailed characterization of
BT-Settl and ATMO 2020 atmospheric model systematics as a function of spectral
type and position in the near-IR color-magnitude diagram. We find the greatest
discrepancies between atmospheric and evolutionary model-derived
(up to 800 K) and radii (up to 2.0 ) at
the M/L transition boundary. With 1054 objects, this work constitutes the
largest sample to date of ultracool dwarfs with determinations of their
fundamental parameters.Comment: Resubmitted to The Astrophysical Journal (ApJ) after a positive
referee report. 51 pages, 29 figures, 7 tables. Data presented in this work:
https://doi.org/10.5281/zenodo.8315643. Scripts associated with methods:
https://github.com/cosmicoder/HIPPVI-Cod
Acceptability and adherence to a Mediterranean diet in the postnatal period to prevent type 2 diabetes in women with gestational diabetes in the UK: a protocol for a single-arm feasibility study (MERIT)
Introduction: Women with gestational diabetes are at increased risk of developing type 2 diabetes later in life. In at-risk general populations, Mediterranean-style diet helps prevent type 2 diabetes. But its effect on postnatal women with a history of gestational diabetes is not known. Prior to a full-scale trial on Mediterranean-style diet in the postnatal period to prevent type 2 diabetes, a feasibility study is required to assess the acceptability of the diet and evaluate the trial processes.
Methods and analysis: MEditerranean diet for pReventIon of type 2 diabeTes is a single-arm feasibility study (65 women) with qualitative evaluation of women who have recently given birth and had gestational diabetes. The intervention is a Mediterranean-style diet supplemented with nuts and olive oil, with dietary advice and an action plan. A dedicated Health Coach will interact with participants through an interactive lifestyle App. Women will follow the intervention from 6 to 13 weeks post partum until 1 year post partum. The primary outcomes are rates of recruitment, follow-up, adherence and attrition. The secondary outcomes are maternal dysglycaemia, cost and quality of life outcomes, and acceptability of the intervention to participants, and to healthcare professionals delivering the intervention. Feasibility outcomes will be reported using descriptive statistics.
Ethics and dissemination: Ethical approval was obtained through the South Central—Berkshire Research Ethics Committee (19/SC/0064). Study findings will be disseminated via publication in peer-reviewed journals, as well as via newsletters made available to participants and members of Katie’s Team (a women’s health patient and public advisory group).
Trial registration number: ISRCTN40582975
Polarised radio pulsations from a new T dwarf binary
Brown dwarfs display Jupiter-like auroral phenomena such as magnetospheric
H emission and coherent radio emission. Coherent radio emission is a
probe of magnetospheric acceleration mechanisms and provides a direct
measurement of the magnetic field strength at the emitter's location, both of
which are difficult to access by other means. Observations of the coldest brown
dwarfs (spectral types T and Y) are particularly interesting as their
magnetospheric phenomena may be very similar to those in gas-giant exoplanets.
Here we present 144 MHz radio and infrared adaptive optics observations of the
brown dwarf WISEP J101905.63+652954.2 made using the LOFAR and Keck telescopes
respectively. The radio data shows pulsed highly circularly polarised emission
which yields a rotation rate of hr. The infrared imaging
reveals the source to be a binary with a projected separation of
mas between components of spectral type T5. and T7.. With a
simple "toy model" we show that the radio emission can in principle be powered
by the interaction between the two dwarfs with a mass-loss rates of at least
times the Jovian value. WISEP J101905.63+652954.2 is interesting because
it is the first pulsed methane dwarf detected in a low radio-frequency search.
Unlike previous gigahertz-frequency searches that were only sensitive to
objects with kiloGauss fields, our low-frequency search is sensitive to surface
magnetic fields of Gauss and above which might reveal the coldest
radio-loud objects down to planetary mass-scales.Comment: Accepted for publication in A&
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