29,268 research outputs found
Thermodielectric radiometer
Radiometer measures microsecond pulses of radiant flux in the presence of electromagnetic noise. It consists of a charged capacitor that delivers a voltage pulse proportional to the thermally induced depolarization of its polymeric dielectric
Inside the Bondi radius of M87
Chandra X-ray observations of the nearby brightest cluster galaxy M87 resolve
the hot gas structure across the Bondi accretion radius of the central
supermassive black hole, a measurement possible in only a handful of systems
but complicated by the bright nucleus and jet emission. By stacking only short
frame-time observations to limit pileup, and after subtracting the nuclear PSF,
we analysed the X-ray gas properties within the Bondi radius at 0.12-0.22 kpc
(1.5-2.8 arcsec), depending on the black hole mass. Within 2 kpc radius, we
detect two significant temperature components, which are consistent with
constant values of 2 keV and 0.9 keV down to 0.15 kpc radius. No evidence was
found for the expected temperature increase within ~0.25 kpc due to the
influence of the SMBH. Within the Bondi radius, the density profile is
consistent with . The lack of a temperature increase inside
the Bondi radius suggests that the hot gas structure is not dictated by the
SMBH's potential and, together with the shallow density profile, shows that the
classical Bondi rate may not reflect the accretion rate onto the SMBH. If this
density profile extends in towards the SMBH, the mass accretion rate onto the
SMBH could be at least two orders of magnitude less than the Bondi rate, which
agrees with Faraday rotation measurements for M87. We discuss the evidence for
outflow from the hot gas and the cold gas disk and for cold feedback, where gas
cooling rapidly from the hot atmosphere could feed the cirumnuclear disk and
fuel the SMBH. At 0.2 kpc radius, the cooler X-ray temperature component
represents ~20% of the total X-ray gas mass and, by losing angular momentum to
the hot gas component, could provide a fuel source of cold clouds within the
Bondi radius.Comment: 14 pages, 8 figures, accepted by MNRA
Comparison of data on Mutation Frequencies of Mice Caused by Radiation - Low Dose Model -
We propose LD(Low Dose) model, the extension of LDM model which was proposed
in the previous paper [Y. Manabe et al.: J. Phys. Soc. Jpn. 81 (2012) 104004]
to estimate biological damage caused by irradiation. LD model takes account of
all the considerable effects including cell death effect as well as
proliferation, apoptosis, repair. As a typical example of estimation, we apply
LD model to the experiment of mutation frequency on the responses induced by
the exposure to low levels of ionizing radiation. The most famous and extensive
experiments are those summarized by Russell and Kelly [Russell, W. L. & Kelly,
E. M: Proc. Natl Acad. Sci. USA 79 (1982) 539-541], which are known as
'Mega-mouse project'. This provides us with important information of the
frequencies of transmitted specific-locus mutations induced in mouse
spermatogonia stem-cells. It is found that the numerical results of the
mutation frequency of mice are in reasonable agreement with the experimental
data: the LD model reproduces the total dose and dose rate dependence of data
reasonably. In order to see such dose-rate dependence more explicitly, we
introduce the dose-rate effectiveness factor (DREF). This represents a sort of
preventable effects such as repair, apoptosis and death of broken cells, which
are to be competitive with proliferation effect of broken cells induced by
irradiation.Comment: subimitting to J. Phys. Soc. Jpn, 32 pages, 8 figure
Stratospheric measurements of continuous absorption near 2400 cm^-1
Solar occultation spectra obtained with a balloon-borne interferometer have been used to study continuous absorption by N2 and CO2 near 2400 cm^-1 in the lower stratosphere. Synthetic continuum transmittances, calculated from published coefficients for far-wing absorption by CO2 lines and for pressure-induced absorption by the fundamental band of N2, are in fair agreement with the observed stratospheric values. The continuum close to the ν3 R-branch band head of CO2 is sensitive to the CO2 far-wing line shape. Therefore, given highly accurate knowledge of the N2 continuum from laboratory data, high-resolution stratospheric spectra provide a sensitive means for in situ testing of various air-broadened CO2 line shapes at low temperatures
Analysis of Work-related Injury and Illness, 2001 to 2014. Sectoral Analysis No. 3: Industry Sector. ESRI and Health and Safety Authority, April 2018
The following analysis draws on the CSO’s Quarterly National Household Survey (QNHS) to explore workrelated
injuries and illnesses in the industry sector (see Box 1 for details on data sources and measures).
The results are based on workers’ self-reports of work-related illness and injury. All injuries and illnesses
are included, regardless of whether or not they resulted in an absence from work as many people continue
to work while sick or injured. Findings across the economy as a whole are explored in Russell et al. (2015
and 2016).i This research briefing provides a within-sector picture of the industry sector over the period
2001–2014. This sector consists of manufacturing, utilities and mining
Analysis of Work-related Injury and Illness, 2001 to 2014. Sectoral Analysis No. 2: Construction Sector. ESRI and Health and Safety Authority, April 2018
The following analysis draws on the Central Statistics Office’s (CSO) Quarterly National Household
Survey (QNHS) to explore work-related accidents and illnesses in the construction sector (see Box 1 for
details on data sources and measures). The results are based on workers’ self-reports of work-related
illness and injury. All injuries and illnesses are included, regardless of whether or not they resulted in an
absence from work, as many people continue to work while sick or injured. Findings across the economy
as a whole are explored in Russell et al. (2015 and 2016).i This research briefing provides a within-sector
picture of the construction sector over the period 2001–2014
Analysis of Work-related Injury and Illness, 2001 to 2014. Sectoral Analysis No. 4: Agriculture, Forestry and Fishing Sector. ESRI and Health and Safety Authority, April 2018
The following analysis draws on the CSO’s Quarterly National Household Survey (QNHS) to explore workrelated
accidents and illnesses in the agriculture, forestry and fishing sector (see Box 1 for details on data
sources and measures). The results are based on workers’ self-reports of work-related illness and injury. All
injuries and illnesses are included, regardless of whether or not they resulted in an absence from work, as
many people continue to work while sick or injured. Findings across the economy as a whole are explored
in Russell et al. (2015 and 2016). This research briefing provides a within-sector picture of the agriculture,
forestry and fishing sector over the period 2001–2014
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