4,132 research outputs found
On the AGN radio luminosity distribution and the black hole fundamental plane
We have studied the dependence of the AGN nuclear radio (1.4 GHz) luminosity
on both the AGN 2-10 keV X-ray and the host-galaxy K-band luminosity. A
complete sample of 1268 X-ray selected AGN (both type 1 and type 2) has been
used, which is the largest catalogue of AGN belonging to statistically well
defined samples where radio, X and K band information exists. At variance with
previous studies, radio upper limits have been statistically taken into account
using a Bayesian Maximum Likelihood fitting method. It resulted that a good fit
is obtained assuming a plane in the 3D L_R-L_X-L_K space, namely logL_R= xi_X
logL_X + xi_K logL_K + xi_0, having a ~1 dex wide (1 sigma) spread in radio
luminosity. As already shown, no evidence of bimodality in the radio luminosity
distribution was found and therefore any definition of radio loudness in AGN is
arbitrary. Using scaling relations between the BH mass and the host galaxy
K-band luminosity, we have also derived a new estimate of the BH fundamental
plane (in the L_5GHz -L_X-M_BH space). Our analysis shows that previous
measures of the BH fundamental plane are biased by ~0.8 dex in favor of the
most luminous radio sources. Therefore, many AGN studies, where the BH
fundamental plane is used to investigate how AGN regulate their radiative and
mechanical luminosity as a function of the accretion rate, or many AGN/galaxy
co-evolution models, where radio-feedback is computed using the AGN fundamental
plane, should revise their conclusions.Comment: Submitted to MNRAS. Revised version after minor referee comments. 12
pages, 12 figure
The higher grading structure of the WKI hierarchy and the two-component short pulse equation
A higher grading affine algebraic construction of integrable hierarchies,
containing the Wadati-Konno-Ichikawa (WKI) hierarchy as a particular case, is
proposed. We show that a two-component generalization of the Sch\" afer-Wayne
short pulse equation arises quite naturally from the first negative flow of the
WKI hierarchy. Some novel integrable nonautonomous models are also proposed.
The conserved charges, both local and nonlocal, are obtained from the Riccati
form of the spectral problem. The loop-soliton solutions of the WKI hierarchy
are systematically constructed through gauge followed by reciprocal B\" acklund
transformation, establishing the precise connection between the whole WKI and
AKNS hierarchies. The connection between the short pulse equation with the
sine-Gordon model is extended to a correspondence between the two-component
short pulse equation and the Lund-Regge model
The algebraic structure behind the derivative nonlinear Schroedinger equation
The Kaup-Newell (KN) hierarchy contains the derivative nonlinear Schr\"
odinger equation (DNLSE) amongst others interesting and important nonlinear
integrable equations. In this paper, a general higher grading affine algebraic
construction of integrable hierarchies is proposed and the KN hierarchy is
established in terms of a Kac-Moody algebra and principal
gradation. In this form, our spectral problem is linear in the spectral
parameter. The positive and negative flows are derived, showing that some
interesting physical models arise from the same algebraic structure. For
instance, the DNLSE is obtained as the second positive, while the Mikhailov
model as the first negative flows, respectively. The equivalence between the
latter and the massive Thirring model is explicitly demonstrated also. The
algebraic dressing method is employed to construct soliton solutions in a
systematic manner for all members of the hierarchy. Finally, the equivalence of
the spectral problem introduced in this paper with the usual one, which is
quadratic in the spectral parameter, is achieved by setting a particular
automorphism of the affine algebra, which maps the homogeneous into principal
gradation.Comment: references adde
Factors associated with costs of hospitalization of severely mentally Ill patients
Background: Efforts to contain costs associated with general medical care include particular efforts for
psychiatric disorders. Hospitalization represents the largest component of costs for psychiatric care and there is
growing interest in balancing clinical needs against limiting costs of inpatient psychiatric care of patients with severe
mental illnesses. This study aimed to evaluate clinical factors associated with actual costs of inpatient psychiatric
care.
Method: We evaluated a cohort of 589 hospitalized psychiatric patients with severe mental illnesses at a
nonprofit, university-affiliated psychiatric hospital for factors associated with annualized total costs of inpatient care
over a three-year period, using bivariate and multivariate analyses.
Results: As expected, days-hospitalized was the major determinant of total costs of hospital care. In addition,
several clinical and treatment factors also were associated significantly and independently with costs in multivariate
modeling. These included presence of psychosis, electroconvulsive treatment, specialist consultations, use of
multiple antipsychotics or of clozapine, and being discharged to a supervised living arrangement, but not sex, age,
marital status, employment, or substance abuse.
Discussion: As expected, costs of psychiatric hospitalization were dominated by per-diem charges, but also
influenced by other, potentially modifiable treatment factors generally associated with more severe psychotic
illnesses. The study is based on actual costs rather than on insurer-reimbursements and a large study-sample,
though at a single institution. Specific factors identified encourage focusing on patient characteristics associated
with greater costs and redoubled efforts to apply and improve alternative, cost-effective interventions such as partialhospital
and intensive outpatient treatment
The M_BH-M_star relation of obscured AGNs at high redshift
We report the detection of broad Halpha emission in three X-ray selected
obscured AGNs at z=1-2. By exploiting the Halpha width and the intrinsic X-ray
luminosity, we estimate their black hole masses, which are in the range
0.1-3x10^9 Msun. By means of multi-band photometric data, we measure the
stellar mass of their host galaxy and, therefore, infer their M_BH/M_star
ratio. These are the first obscured AGNs at high-z, selected based on their
black hole accretion (i.e. on the basis of their X-ray luminosity), that can be
located on the M_BH-M_star relation at high-z. All of these obscured high-z
AGNs are fully consistent with the local M_BH-M_star relation. This result
conflicts with those for other samples of AGNs in the same redshift range,
whose M_BH/M_star ratio departs significantly from the value observed in local
galaxies. We suggest that the obscured AGNs in our sample are in an advanced
evolutionary stage, have already settled onto the local M_BH-M_star relation,
and whose nuclear activity has been temporarily revived by recent galaxy
interactions.Comment: 4 pages, 2 figures, accepted for publication in A&A Letters, slightly
revised discussion on SMG
Qualidade fisiologica e sanitaria de sementes de soja.
Qualidade fisiologica da semente; Deterioracao no campo; Colheita no momento adequado; Aplicacao de dessecantes; Aplicacao de fungicidas foliares; Semeadura em epoca adequada; Determinacao de regioes mais propicias a producao de sementes; Utilizacao de cultivares para sementes de boa qualidade; Danos mecanicos; Danos causados por percevejos; Qulidade sanitaria da semente; Fungos fitopatogenicos; Phomopsis sp. - queima da haste e da vagem; Colletotrichum dematium (Pers. ex. Fr.) Grove var. truncata (Schw.) von Arx. - antracnose; Cercospora kikuchii (Matsu. & Tomoy) Gardner - mancha purpura; Cercospora sojina Hara - mancha "olho-de-ra"; Macrophomina phaseolina (Tassi) Goid - podridao preta das raizes; Rhizoctonia solani Kuhn - tombamento e morte em reboleira; Sclerotnia sclerotiorum Lib (De Bary) - podridao branca da haste e da vagem; Peronospora manshurica (Naum:) Syd. ex. Gaum. - mildio da soja; Sclerotium rolfsii Sacc. - murcha de esclerocio; Fusarium semitectum Berk & Rav; Myrothecium roridum - (Tode ex Sacc. ) mancha de mirotecio; Corynespora cassiicola (Berk & Curt) Wei - mancha-alvo; Fungos de armazenagem ou nao fitopatogenicos; Aspergillus spp.; Penicillium spp.; Outros.bitstream/item/50774/1/9.pd
- …