93 research outputs found
Maser action in methanol transitions
We report the detection with the ATCA of 6.7 GHz methanol emission towards
OMC-1. The source has a size between 40'' and 90'', is located to the
south-east of Ori-KL and may coincide in position with the 25 GHz masers. The
source may be an example of an interesting case recently predicted in theory
where the transitions of traditionally different methanol maser classes show
maser activity simultaneously. In addition, results of recent search for
methanol masers from the 25 and 104.3 GHz transitions are reported.Comment: To appear in the Proceedings of the 2004 European Workshop: "Dense
Molecular Gas around Protostars and in Galactic Nuclei", Eds. Y.Hagiwara,
W.A.Baan, H.J. van Langevelde, 2004, a special issue of ApSS, Kluwer; author
list has been corrected, text is unchange
Model of the W3(OH) environment based on data for both maser and 'quasi-thermal' methanol lines
In studies of the environment of massive young stellar objects, recent
progress in both observations and theory allows a unified treatment of data for
maser and 'quasi-thermal' lines. Interferometric maser images provide
information on the distribution and kinematics of masing gas on small spatial
scales. Observations of multiple masing transitions provide constraints on the
physical parameters.
Interferometric data on 'quasi-thermal' molecular lines permits an
investigation of the overall distribution and kinematics of the molecular gas
in the vicinity of young stellar objects, including those which are deeply
embedded. Using multiple transitions of different molecules, one can obtain
good constraints on the physical and chemical parameters.
Combining these data enables the construction of unified models, which take
into account spatial scales differing by orders of magnitude.
Here we present such a combined analysis of the environment around the
ultracompact HII region in W3(OH). This includes the structure of the methanol
masing region, physical structure of the near vicinity of W3(OH), detection of
new masers in the large-scale shock front and embedded sources in the vicinity
of the TW young stellar object.Comment: To appear in the Proceedings of the 2004 European Workshop: "Dense
Molecular Gas around Protostars and in Galactic Nuclei", Eds. Y.Hagiwara,
W.A.Baan, H.J. van Langevelde, 2004, a special issue of ApSS, Kluwe
Maser Action in Methanol Transitions
We report the detection with the ATCA of 6.7 GHz methanol emission towards OMC-1. The source has a size between 40âł and 90âł, is located to the south-east of Ori-KL and may coincide in position with the 25 GHz masers. The source may be an example of an interesting case recently predicted in theory where the transitions of traditionally different methanol maser classes show maser activity simultaneously. In addition, results of recent search for methanol masers from the 25 and 104.3 GHz transitions are reported. © Springer 2005 Science + Business Media, Inc.We would like to thank the local staff of Narrabri and Onsala observatories for the help during observations. The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. Maxim Voronkov and Alexei Alakoz were partially supported by the RFBR grant no. 01-02-16902 and by the program âExtended objects in the Universe-2003â. Andrej Sobolev and Andrei Ostrovskii were supported by the RFBR grant no. 03-02-16433
Đ„ĐĐ ĐŁĐ ĐĐЧĐĐĄĐĐĐŻ ĐĐĐ Đ ĐĐĐŠĐĐŻ ĐĐĐ€ĐĐ ĐĐĐŠĐĐ ĐĐĐĐĐĐĐЧĐĐĐĐ ĐĐ Đ ĐĐĐĐĐĐĐąĐЧĐĐĄĐĐĐ ĐĄĐĐĐĐĐĐĐ: ĐĐĄĐąĐĐ ĐĐŻ Đ ĐĄĐĐĐ ĐĐĐĐĐĐĐ ĐĄĐĐĄĐąĐĐŻĐĐĐ (ĐĐĐĐĐ ĐĐĐąĐĐ ĐйУРЫ)
The article presents the historical and contemporary aspects of the state of the question correct scoliosis spine with dorsal and ventral spinal systems. The variants of spinal deformity correction method from Harrington to modern surgical techniques using both hook and metal screw. Detailed technological aspects of surgical interventions for the correction of spinal deformity using a variety of spinal structures. A comparative estimate of the correction of spinal deformity, the impact on the result of the initial mobility of the spine, level metallofiksatsii vertebral-motor segment, as well as the degree of true derotation vertebrae at the top of the curvature in a variety of surgical procedures. Describes the advantages and disadvantages of options for surgery.РлОŃĐ”ŃĐ°ŃŃŃĐœĐŸĐŒ ĐŸĐ±Đ·ĐŸŃĐ” ĐŸŃĐČĐ”ŃĐ°ŃŃŃŃ ĐžŃŃĐŸŃĐžŃ Đž ŃĐŸĐČŃĐ”ĐŒĐ”ĐœĐœĐŸĐ” ŃĐŸŃŃĐŸŃĐœĐžĐ” ĐżŃĐŸĐ±Đ»Đ”ĐŒŃ ĐșĐŸŃŃĐ”ĐșŃОО ŃĐșĐŸĐ»ĐžĐŸŃĐžŃĐ”ŃĐșĐŸĐč ĐŽĐ”ŃĐŸŃĐŒĐ°ŃОО ĐżĐŸĐ·ĐČĐŸĐœĐŸŃĐœĐžĐșĐ° Ń ĐžŃĐżĐŸĐ»ŃĐ·ĐŸĐČĐ°ĐœĐžĐ”ĐŒ ĐŽĐŸŃĐ·Đ°Đ»ŃĐœŃŃ
Đž ĐČĐ”ĐœŃŃĐ°Đ»ŃĐœŃŃ
ŃĐżĐžĐœĐ°Đ»ŃĐœŃŃ
ŃĐžŃŃĐ”ĐŒ. Đ Đ°ŃŃĐŒĐŸŃŃĐ”ĐœŃ ĐČĐ°ŃĐžĐ°ĐœŃŃ ĐžŃĐżŃĐ°ĐČĐ»Đ”ĐœĐžŃ ĐŽĐ”ŃĐŸŃĐŒĐ°ŃОО ĐżĐŸĐ·ĐČĐŸĐœĐŸŃĐœĐžĐșĐ° ĐœĐ°ŃĐžĐœĐ°Ń Ń ĐŒĐ”ŃĐŸĐŽĐ° Đ„Đ°ŃŃĐžĐœĐłŃĐŸĐœĐ° Đž Đ·Đ°ĐșĐ°ĐœŃĐžĐČĐ°Ń ŃĐŸĐČŃĐ”ĐŒĐ”ĐœĐœŃĐŒĐž Ń
ĐžŃŃŃгОŃĐ”ŃĐșĐžĐŒĐž ŃĐ”Ń
ĐœĐŸĐ»ĐŸĐłĐžŃĐŒĐž Ń ĐżŃĐžĐŒĐ”ĐœĐ”ĐœĐžĐ”ĐŒ ĐșŃŃĐșĐŸĐČŃŃ
Đž ĐČĐžĐœŃĐŸĐČŃŃ
ĐŒĐ”ŃĐ°Đ»Đ»ĐŸĐșĐŸĐœŃŃŃŃĐșŃĐžĐč. ĐĐ°Đœ ĐŸĐ±Đ·ĐŸŃ ŃĐ”Ń
ĐœĐŸĐ»ĐŸĐłĐžŃĐ”ŃĐșĐžŃ
ĐŸŃĐŸĐ±Đ”ĐœĐœĐŸŃŃĐ”Đč ĐŸĐżĐ”ŃĐ°ŃĐžĐČĐœŃŃ
ĐČĐŒĐ”ŃĐ°ŃДлŃŃŃĐČ ĐżŃĐž ĐșĐŸŃŃĐ”ĐșŃОО ĐŽĐ”ŃĐŸŃĐŒĐ°ŃОО ĐżĐŸĐ·ĐČĐŸĐœĐŸŃĐœĐžĐșĐ° Ń ĐžŃĐżĐŸĐ»ŃĐ·ĐŸĐČĐ°ĐœĐžĐ”ĐŒ ŃазлОŃĐœŃŃ
ŃĐżĐžĐœĐ°Đ»ŃĐœŃŃ
ĐșĐŸĐœŃŃŃŃĐșŃĐžĐč, ĐŸĐżĐžŃĐ°ĐœŃ ĐžŃ
ĐŽĐŸŃŃĐŸĐžĐœŃŃĐČĐ° Đž ĐœĐ”ĐŽĐŸŃŃĐ°ŃĐșĐž
Multimode solutions of first-order elliptic quasilinear systems obtained from Riemann invariants
Two new approaches to solving first-order quasilinear elliptic systems of
PDEs in many dimensions are proposed. The first method is based on an analysis
of multimode solutions expressible in terms of Riemann invariants, based on
links between two techniques, that of the symmetry reduction method and of the
generalized method of characteristics. A variant of the conditional symmetry
method for constructing this type of solution is proposed. A specific feature
of that approach is an algebraic-geometric point of view, which allows the
introduction of specific first-order side conditions consistent with the
original system of PDEs, leading to a generalization of the Riemann invariant
method for solving elliptic homogeneous systems of PDEs. A further
generalization of the Riemann invariants method to the case of inhomogeneous
systems, based on the introduction of specific rotation matrices, enables us to
weaken the integrability condition. It allows us to establish a connection
between the structure of the set of integral elements and the possibility of
constructing specific classes of simple mode solutions. These theoretical
considerations are illustrated by the examples of an ideal plastic flow in its
elliptic region and a system describing a nonlinear interaction of waves and
particles. Several new classes of solutions are obtained in explicit form,
including the general integral for the latter system of equations
Sizes of Masing Parts of Massive Star Forming Regions
It is shown that the images, line profiles, and time evolution of different interstellar masing transitions can be explained by the hypothesis that the population inversions giving birth to masers take place in turbulent regions with extents that are orders of magnitude greater than the sizes of the maser spots. It is shown that the images of methanol masers in the turbulent model persist within considerable time and do not prevent measurement of the annual parallaxes using data on the 12 GHz methanol maser positions.ĐĐŸĐșĐ°Đ·Đ°ĐœĐŸ, ŃŃĐŸ ĐžĐ·ĐŸĐ±ŃĐ°Đ¶Đ”ĐœĐžŃ, ĐżŃĐŸŃОлО Đ»ĐžĐœĐžĐč Đž ĐČŃĐ”ĐŒĐ”ĐœĐœĐ°Ń ŃĐČĐŸĐ»ŃŃĐžŃ ŃазлОŃĐœŃŃ
пДŃĐ”Ń
ĐŸĐŽĐŸĐČ ĐŒĐ”Đ¶Đ·ĐČĐ”Đ·ĐŽĐœŃŃ
ĐŒĐ°Đ·Đ”ŃĐŸĐČ ĐŒĐŸĐłŃŃ Đ±ŃŃŃ ĐŸĐ±ŃŃŃĐœĐ”ĐœŃ ĐČ ŃĐ°ĐŒĐșĐ°Ń
ĐłĐžĐżĐŸŃĐ”Đ·Ń ĐŸ ŃĐŸĐŒ, ŃŃĐŸ ĐžĐœĐČĐ”ŃŃĐžŃ ĐœĐ°ŃĐ”Đ»Đ”ĐœĐœĐŸŃŃĐ”Đč, ĐżŃĐžĐČĐŸĐŽŃŃĐ°Ń Đș ĐżĐŸŃĐČĐ»Đ”ĐœĐžŃ ĐŒĐ°Đ·Đ”ŃĐŸĐČ, ĐČĐŸĐ·ĐœĐžĐșĐ°Đ”Ń ĐČ ŃŃŃбŃĐ»Đ”ĐœŃĐœŃŃ
ŃĐ°ĐčĐŸĐœĐ°Ń
Ń ŃĐ°Đ·ĐŒĐ”ŃĐ°ĐŒĐž, ĐżŃĐ”ĐČŃŃĐ°ŃŃĐžĐŒĐž ŃĐ°Đ·ĐŒĐ”ŃŃ ĐŒĐ°Đ·Đ”ŃĐœŃŃ
ĐżŃŃĐ”Đœ ĐœĐ° ĐżĐŸŃŃĐŽĐșĐž ĐČДлОŃĐžĐœŃ. ĐĐŸĐșĐ°Đ·Đ°ĐœĐŸ ŃĐ°ĐșжД, ŃŃĐŸ ĐžĐ·ĐŸĐ±ŃĐ°Đ¶Đ”ĐœĐžŃ ĐŒĐ”ŃĐ°ĐœĐŸĐ»ŃĐœŃŃ
ĐŒĐ°Đ·Đ”ŃĐŸĐČ ĐČ ŃŃŃбŃĐ»Đ”ĐœŃĐœĐŸĐč ĐŒĐŸĐŽĐ”Đ»Đž ĐŸŃŃĐ°ŃŃŃŃ ĐœĐ”ĐžĐ·ĐŒĐ”ĐœĐœŃĐŒĐž ĐČ ŃĐ”ŃĐ”ĐœĐžĐ” ĐżŃĐŸĐŽĐŸĐ»Đ¶ĐžŃДлŃĐœĐŸĐłĐŸ ĐČŃĐ”ĐŒĐ”ĐœĐž, ŃŃĐŸ ĐżĐŸĐ·ĐČĐŸĐ»ŃĐ”Ń ĐżŃĐŸĐČĐŸĐŽĐžŃŃ ĐžĐ·ĐŒĐ”ŃĐ”ĐœĐžŃ ĐłĐŸĐŽĐžŃĐœŃŃ
паŃаллаĐșŃĐŸĐČ ĐżĐŸ ĐŽĐ°ĐœĐœŃĐŒ ĐŸ ĐżĐŸĐ»ĐŸĐ¶Đ”ĐœĐžŃŃ
ĐŒĐ”ŃĐ°ĐœĐŸĐ»ŃĐœŃŃ
ĐŒĐ°Đ·Đ”ŃĐŸĐČ ĐœĐ° 12 ĐĐŃ.ĐĐŸĐșĐ°Đ·Đ°ĐœĐŸ, ŃĐŸ Đ·ĐŸĐ±ŃĐ°Đ¶Đ”ĐœĐœŃ, ĐżŃĐŸŃŃĐ»Ń Đ»ŃĐœŃĐč ŃĐ° ŃĐ°ŃĐŸĐČŃ Đ”ĐČĐŸĐ»ŃŃŃŃ ŃŃĐ·ĐœĐžŃ
пДŃĐ”Ń
ĐŸĐŽŃĐČ ĐŒŃĐ¶Đ·ĐŸŃŃĐœĐžŃ
ĐŒĐ°Đ·Đ”ŃŃĐČ ĐŒĐŸĐ¶ĐœĐ° ĐżĐŸŃŃĐœĐžŃĐž ĐČ ĐŒĐ”Đ¶Đ°Ń
ĐłŃĐżĐŸŃДзО ĐżŃĐŸ ŃĐ”, ŃĐŸ ŃĐœĐČĐ”ŃŃŃŃ ĐœĐ°ŃĐ”Đ»Đ”ĐœĐŸŃŃĐ”Đč, ĐșĐŸŃŃĐ° ĐżŃОзĐČĐŸĐŽĐžŃŃ ĐŽĐŸ ĐżĐŸŃĐČĐž ĐŒĐ°Đ·Đ”ŃŃĐČ, ĐČĐžĐœĐžĐșĐ°Ń ĐČ ŃŃŃбŃĐ»Đ”ĐœŃĐœĐžŃ
ŃĐ°ĐčĐŸĐœĐ°Ń
Đ· ŃĐŸĐ·ĐŒŃŃĐ°ĐŒĐž, ĐČĐžŃĐžĐŒĐž Đ·Đ° ŃĐ°ĐșŃ ĐŒĐ°Đ·Đ”ŃĐœĐžŃ
плŃĐŒ ĐœĐ° ĐżĐŸŃŃĐŽĐșĐž ĐČДлОŃĐžĐœĐž. ĐĐŸĐșĐ°Đ·Đ°ĐœĐŸ ŃĐ°ĐșĐŸĐ¶, ŃĐŸ Đ·ĐŸĐ±ŃĐ°Đ¶Đ”ĐœĐœŃ ĐŒĐ”ŃĐ°ĐœĐŸĐ»ŃĐœĐžŃ
ĐŒĐ°Đ·Đ”ŃŃĐČ Ń ŃŃŃбŃĐ»Đ”ĐœŃĐœŃĐč ĐŒĐŸĐŽĐ”Đ»Ń Đ·Đ°Đ»ĐžŃĐ°ŃŃŃŃŃ ĐœĐ”Đ·ĐŒŃĐœĐœĐžĐŒĐž ĐżŃĐŸŃŃĐłĐŸĐŒ ĐŽĐŸĐČĐłĐŸĐłĐŸ ŃĐ°ŃŃ, ŃĐŸ ĐŽĐŸĐ·ĐČĐŸĐ»ŃŃ ĐČĐžĐŒŃŃŃĐČĐ°ŃĐž ŃŃŃĐœŃ ĐżĐ°ŃалаĐșŃĐž Đ·Đ° ĐŽĐ°ĐœĐžĐŒĐž ĐżŃĐŸ ŃĐŸĐ·ŃĐ°ŃŃĐČĐ°ĐœĐœŃ ĐŒĐ”ŃĐ°ĐœĐŸĐ»ŃĐœĐžŃ
ĐŒĐ°Đ·Đ”ŃŃĐČ ĐœĐ° 12 ĐĐŃ
Long- and short-term earthquake prediction in Kamchatka
This paper presents the results of long- and short-term earthquake prediction obtained during 1971â1974. They can be summarized as follows:
The map of long-term prediction for the KurileâKamchatka zone compiled in 1965 and supplemented in 1972 by S.A. Fedotov is in good agreement (in four of four possible cases) with recorded seismicity.
The results obtained allow us to suppose that the areas for which the log (Ep/Es) of small earthquakes is low may be the areas of future large earthquakes.
Prediction of active periods for the Kamchatka earthquakes with M > 7 has been made on the basis of studying the correlation of seismicity with the lunar tide with a 18.6-year period. A possibility has been found for using the phenomenon of âinduced foreshocksâ for earthquake prediction, i.e., when a large remote earthquake induces small preceding events in the zone of preparation of a large earthquake.
The following three methods were used for operative short-term prediction of the time and place of future earthquakes with M > 5.5.
1.(1) Use of specific electrotelluric field anomalies, from 5 to 20 days in duration, which are recorded by a specially designed network of stations.
2.(2) Method of Vp/Vs anomalies. The anomalously high and low Vp/Vs values for a seismic station point to the possibility of large earthquakes near the latter.
3.(3) The earthquake statistics method described by Fedotov et al. in 1972.
Short-term seismic prediction is being made twice a week in two versions: Forecast I (for the whole of Kamchatka) and Forecast II (for each of six overlapping segments of the Kamchatka seismic zone).
This paper discusses the results of successful testing of short-term earthquake prediction during two years. During the âalarmâ periods the probability of large earthquakes is double the average.
Paper presented at the Symposium on Earthquake Forerunners Searching, Tashkent, May 26âJune 1, 1974
Spectroscopy of Na: Bridging the two-proton radioactivity of Mg
The unbound nucleus Na, the intermediate nucleus in the two-proton
radioactivity of Mg, was studied by the measurement of the resonant
elastic scattering reaction Ne(p,Ne)p performed at 4 A.MeV.
Spectroscopic properties of the low-lying states were obtained in a R-matrix
analysis of the excitation function. Using these new results, we show that the
lifetime of the Mg radioactivity can be understood assuming a sequential
emission of two protons via low energy tails of Na resonances
Models for Type Ia supernovae and related astrophysical transients
We give an overview of recent efforts to model Type Ia supernovae and related
astrophysical transients resulting from thermonuclear explosions in white
dwarfs. In particular we point out the challenges resulting from the
multi-physics multi-scale nature of the problem and discuss possible numerical
approaches to meet them in hydrodynamical explosion simulations and radiative
transfer modeling. We give examples of how these methods are applied to several
explosion scenarios that have been proposed to explain distinct subsets or, in
some cases, the majority of the observed events. In case we comment on some of
the successes and shortcoming of these scenarios and highlight important
outstanding issues.Comment: 20 pages, 2 figures, review published in Space Science Reviews as
part of the topical collection on supernovae, replacement corrects typos in
the conclusions sectio
Risk profiles and one-year outcomes of patients with newly diagnosed atrial fibrillation in India: Insights from the GARFIELD-AF Registry.
BACKGROUND: The Global Anticoagulant Registry in the FIELD-Atrial Fibrillation (GARFIELD-AF) is an ongoing prospective noninterventional registry, which is providing important information on the baseline characteristics, treatment patterns, and 1-year outcomes in patients with newly diagnosed non-valvular atrial fibrillation (NVAF). This report describes data from Indian patients recruited in this registry. METHODS AND RESULTS: A total of 52,014 patients with newly diagnosed AF were enrolled globally; of these, 1388 patients were recruited from 26 sites within India (2012-2016). In India, the mean age was 65.8 years at diagnosis of NVAF. Hypertension was the most prevalent risk factor for AF, present in 68.5% of patients from India and in 76.3% of patients globally (P < 0.001). Diabetes and coronary artery disease (CAD) were prevalent in 36.2% and 28.1% of patients as compared with global prevalence of 22.2% and 21.6%, respectively (P < 0.001 for both). Antiplatelet therapy was the most common antithrombotic treatment in India. With increasing stroke risk, however, patients were more likely to receive oral anticoagulant therapy [mainly vitamin K antagonist (VKA)], but average international normalized ratio (INR) was lower among Indian patients [median INR value 1.6 (interquartile range {IQR}: 1.3-2.3) versus 2.3 (IQR 1.8-2.8) (P < 0.001)]. Compared with other countries, patients from India had markedly higher rates of all-cause mortality [7.68 per 100 person-years (95% confidence interval 6.32-9.35) vs 4.34 (4.16-4.53), P < 0.0001], while rates of stroke/systemic embolism and major bleeding were lower after 1 year of follow-up. CONCLUSION: Compared to previously published registries from India, the GARFIELD-AF registry describes clinical profiles and outcomes in Indian patients with AF of a different etiology. The registry data show that compared to the rest of the world, Indian AF patients are younger in age and have more diabetes and CAD. Patients with a higher stroke risk are more likely to receive anticoagulation therapy with VKA but are underdosed compared with the global average in the GARFIELD-AF. CLINICAL TRIAL REGISTRATION-URL: http://www.clinicaltrials.gov. Unique identifier: NCT01090362
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