19,162 research outputs found
An Astrometric Approach to Measuring the Color of an Object
The color of a star is a critical feature to reflect its physical property
such as the temperature. The color index is usually obtained via absolute
photometry, which is demanding for weather conditions and instruments. In this
work, we present an astrometric method to measure the catalog-matched color
index of an object based on the effect of differential color refraction (DCR).
Specifically, we can observe an object using only one filter or alternately
using two different filters. Through the difference of the DCR effect compared
with reference stars, the catalog-matched color index of an object can be
conveniently derived. Hence, we can perform DCR calibration and obtain its
accurate and precise positions even if observed with Null filter during a large
range of zenith distances, by which the limiting magnitude and observational
efficiency of the telescope can be significantly improved. This method takes
advantage of the DCR effect and builds a link between astrometry and
photometry. In practice, we measure the color indices and positions of Himalia
(the sixth satellite of Jupiter) using 857 CCD frames over 8 nights by two
telescopes. Totally, the mean color index BP-RP (Gaia photometric system) of
Himalia is 0.750 \pm 0.004 magnitude. Through the rotational phased color index
analysis, we find two places with their color indices exceeding the mean \pm 3
\sigma.Comment: 10 pages, 5 figures, 4 table
Recovery of Quenched Hopping Conduction in GaAs-Layers Grown by Molecular-Beam Epitaxy at 200-Degrees-C
The dark current at 82 K, in GaAs layers grown by molecular-beam epitaxy at 200 °C and annealed at 550 °C, is reduced by a factor 350 after 5 min of IR (hν\u3c~1.12 eV) light illumination. As temperature is swept upward at 0.2 K/s, the current recovers rapidly near 130 K. A numerical analysis of the current recovery, based on hopping conduction, gives an excellent fit to the data for a thermal recovery rate r=3×108 exp(-0.26/kT), very close to the rate observed for EL2 (AsGa). This proves that the conduction below 300 K in this material is due to hopping between AsGa-related centers in their ground states. Variable-range hopping [exp-(T0/T)1/4] gives a slightly better fit to the data than nearest-neighbor hopping [exp(-ɛ3/kT)] in the range T=82-160 K, but the fitted recovery rate is not strongly affected no matter which mechanism is assumed
The Serpens filament: at the onset of slightly supercritical collapse
The Serpens filament, as one of the nearest infrared dark clouds, is regarded
as a pristine filament at a very early evolutionary stage of star formation. In
order to study its molecular content and dynamical state, we mapped this
filament in seven species. Among them, HCO, HNC, HCN, and CS show
self-absorption, while CO is most sensitive to the filamentary
structure. A kinematic analysis demonstrates that this filament forms a
velocity-coherent (trans-)sonic structure, a large part of which is one of the
most quiescent regions in the Serpens cloud. Widespread CO depletion is
found throughout the Serpens filament. Based on the Herschel dust-derived
H column density map, the line mass of the filament is
36--41~M~pc, and its full width at half maximum is
0.170.01~pc, while its length is ~1.6~pc. The inner radial column density
profile of this filament can be well fitted with a Plummer profile with an
exponent of 2.20.1, a scale radius of pc, and a central
density of ~cm. The Serpens filament appears
to be slightly supercritical. The widespread blue-skewed HNC and CS line
profiles and HCN hyperfine line anomalies across this filament indicate radial
infall in parts of the Serpens filament. CO velocity gradients also
indicate accretion flows along the filament. The velocity and density
structures suggest that such accretion flows are likely due to a longitudinal
collapse parallel to the filament's long axis. Both the radial infall rate and
the longitudinal accretion rate along the Serpens filament are lower than all
previously reported values in other filaments. This indicates that the Serpens
filament lies at an early evolutionary stage when collapse has just begun, or
that thermal and non-thermal support are effective in providing support against
gravity.Comment: 22 pages, 14 figures, 4 tables, accepted for publication in A&A; for
the draft showing figures with full resolution, see
http://gongyan2444.github.io/pdf/absfil.pd
H-Alpha and Hard X-Ray Observations of a Two-Ribbon Flare Associated with a Filament Eruption
We perform a multi-wavelength study of a two-ribbon flare on 2002 September
29 and its associated filament eruption, observed simultaneously in the H-alpha
line by a ground-based imaging spectrograph and in hard X-rays by RHESSI. The
flare ribbons contain several H-alpha bright kernels that show different
evolutional behaviors. In particular, we find two kernels that may be the
footpoints of a loop. A single hard X-ray source appears to cover these two
kernels and to move across the magnetic neutral line. We explain this as a
result of the merging of two footpoint sources that show gradually asymmetric
emission owing to an asymmetric magnetic topology of the newly reconnected
loops. In one of the H-alpha kernels, we detect a continuum enhancement at the
visible wavelength. By checking its spatial and temporal relationship with the
hard X-ray emission, we ascribe it as being caused by electron beam
precipitation. In addition, we derive the line-of-sight velocity of the
filament plasma based on the Doppler shift of the filament-caused absorption in
the H-alpha blue wing. The filament shows rapid acceleration during the
impulsive phase. These observational features are in principal consistent with
the general scenario of the canonical two-ribbon flare model.Comment: 15 pages, 5 figures, accepted for publication in Ap
Hard photon flow and photon-photon correlation in intermediate energy heavy-ion collisions
Hard photons emitted from energetic heavy ion collisions are very interesting
since they do not experience nuclear interaction, and therefore they are useful
to explore properties of nuclear matter. We investigated hard photon production
and its properties in intermediate energy heavy-ion collisions with the help of
the Blotzmann-Uehling-Ulenbeck model. Two components of hard photons are
discussed: direct and thermal. The positive directed flow parameter and
negative elliptic flow parameter of direct photons are demonstrated and they
are anti-correlated to the flows of free protons. The dependencies of hard
photon production and anisotropic parameters on impact parameter, beam energy,
nuclear equation of state and symmetry energy are also discussed. Furthermore,
we investigated the two-photon momentum correlation function from which the
space-time structure information of the photon source could be extracted as
well as the two-photon azimuthal correlation which could provide another good
method to determine the elliptic flow parameter of direct hard photons.Comment: 13 pages, 18 figure
Warm-Hot Gas in and around the Milky Way: Detection and Implications of OVII Absorption toward LMC X-3
X-ray absorption lines of highly-ionized species such as OVII at about zero
redshift have been firmly detected in the spectra of several active galactic
nuclei. However, the location of the absorbing gas remains a subject of debate.
To separate the Galactic and extragalactic contributions to the absorption, we
have obtained Chandra LETG-HRC and FUSE observations of the black hole X-ray
binary LMC X--3. A joint analysis of the detected OVII and Ne IX Kalpha lines,
together with the non-detection of the OVII Kbeta and OVIII Kalpha lines, gives
the measurements of the temperature, velocity dispersion, and hot oxygen column
density. The X-ray data also allow us to place a 95% confidence lower limit to
the Ne/O ratio as 0.14. The OVII line centroid and its relative shift from the
Galactic OI Kalpha absorption line, detected in the same observations, are
inconsistent with the systemic velocity of LMC X--3 ().
The far-UV spectrum shows OVI absorption at Galactic velocities, but no OVI
absorption is detected at the LMC velocity at significance. Both
the nonthermal broadening and the decreasing scale height with the increasing
ionization state further suggest an origin of the highly-ionized gas in a
supernova-driven galactic fountain. In addition, we estimate the warm and hot
electron column densities from our detected OVII Kalpha line in the LMC X--3
X-ray spectra and from the dispersion measure of a pulsar in the LMC vicinity.
We then infer the O/H ratio of the gas to be ,
consistent with the chemically-enriched galactic fountain scenario. We conclude
that the Galactic hot interstellar medium should in general substantially
contribute to zero-redshift X-ray absorption lines in extragalactic sources.Comment: 11 pages, accepted for publication in Ap
K^+ production in baryon-baryon and heavy-ion collisions
Kaon production cross sections in nucleon-nucleon, nucleon-delta and
delta-delta interactions are studied in a boson exchange model. For the latter
two interactions, the exchanged pion can be on-mass shell, only contributions
due to a virtual pion are included via the Peierls method by taking into
account the finite delta width. With these cross sections and also those for
pion-baryon interactions, subthreshold kaon production from heavy ion
collisions is studied in the relativistic transport model.Comment: to appear in Phys. Rev.
Solving variational inequalities defined on a domain with infinitely many linear constraints
We study a variational inequality problem whose domain is defined by infinitely many linear inequalities. A discretization method and an analytic center based inexact cutting plane method are proposed. Under proper assumptions, the convergence results for both methods are given. We also provide numerical examples to illustrate the proposed method
Long-term simulation of growth stage-based irrigation scheduling in maize under various water constraints in Colorado, USA
© The Author(s) 2017. Due to varying crop responses to water stress at different growth stages, scheduling irrigation is a challenge for farmers, especially when water availability varies on a monthly, seasonal and yearly basis. The objective of this study was to optimize irrigation between the vegetative (V) and reproductive (R) phases of maize under different available water levels in Colorado. Longterm (1992-2013) scenarios simulated with the calibrated Root Zone Water Quality Model were designed to meet 40%-100% of crop evapotranspiration (ET) requirements at V and R phases, subject to seasonal water availabilities (300, 400, 500 mm, and no water limit), with and without monthly limits (total of 112 scenarios). The most suitable irrigation between Vand R phases of maize was identified as 60/100, 80/100, and 100/100 of crop ET requirement for the 300, 400, 500 mm water available, respectively, based on the simulations from 1992 to 2013. When a monthly water limit was imposed, the corresponding suitable irrigation targets between V and R stages were 60/100, 100/100, and 100/100 of crop ET requirement for the above three seasonal water availabilities, respectively. Irrigation targets for producing higher crop yield with reduced risk of poor yield were discussed for projected five-year water availabilities
Combination of acupuncture and Chinese medicinal herbs in treating model rats with Polycystic Ovary Syndrome
We explored the effects of combination of acupuncture and Chinese medicinal herbs in treating model rats with polycystic ovarian syndrome (PCOS) and to explore whether acupuncture has positive effects on the absorption of salvianolic acid B in the extracts of a Chinese medicine formula when treating the model rats. 60 female Sprague–Dawley (SD) rats were randomly divided into Groups A, B, C, D, E and F, with ten rats in each group. Except Group F, all of the other rats were induced to PCOS with oral administration of letrozole. The rats in Group F served as normal controls. Group A was treated with acupuncture. Group B was treated with oral administration of the extracts of the Chinese medicine formula. Group C was treated with a combination of oral administration of the extracts of Chinese medicine and acupuncture. Group D received western medicine as positive controls. After treatment, the serum levels of follicle stimulating hormone (FSH), luteinizing hormone(LH) and testosterone (T) in each group were detected with the Enzyme-Linked ImmunoSorbent Assay (ELISA) and the serum concentration of salvianolic acid B were determined using High Performance Liquid Chromatography (HPLC). The serum levels of T and the ratio of LH/FSH in Group A, B. C, D, and F were significantly lower than those of Group E, indicating the model rats with PCOS were successfully established. Compared with Groups A, B, D and E, the serum levels of T and the ratio of LH/FSH in Group C were significantly lower respectively, indicating combination of acupuncture and Chinese medicinal herbs can significantly enhance curative effects in treating model rats with PCOS. The concentration of serum salvianolic acid Group C was significantly higher than Group B, indicating that acupuncture might improve the absorption of salvianolic acid B from the extracts of Salvia miltiorrhiza Bunge in the Chinese medicine formula. Combination of acupuncture and Chinese medicinal herbs significantly enhance curative effects in treating model rats with PCOS and acupuncture has positive effects in improving the absorption of salvianolic acid B in the extracts of the Chinese medicine formula when treating the model rats with PCOS.Key words: Acupuncture; Chinese medicine; Polycystic ovarian syndrome (PCOS).doi: 10.4314/ajtcam.v8i4.
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