1,616 research outputs found
Program Evaluation : the Clinical Programming of an Adolescent Psychiatric Residential Program and Adherence to Clinical Best Practice Guidelines
The structure and delivery of clinical services at an adolescent psychiatric community residential program (PCR), located in New Jersey, was evaluated and compared to national clinical guidelines in order to determine the effectiveness of the services being delivered. A multitude of demographic and clinical variables were examined through the review of 70 closed medical records over a 5-year period. An exploration of the history, rationale, and effectiveness of residential treatment services for adolescents is also presented, along with recommendations for the delivery of more effective clinical services
Rotating black hole orbit functionals in the frequency domain
In many astrophysical problems, it is important to understand the behavior of
functions that come from rotating (Kerr) black hole orbits. It can be
particularly useful to work with the frequency domain representation of those
functions, in order to bring out their harmonic dependence upon the fundamental
orbital frequencies of Kerr black holes. Although, as has recently been shown
by W. Schmidt, such a frequency domain representation must exist, the coupled
nature of a black hole orbit's and motions makes it difficult to
construct such a representation in practice. Combining Schmidt's description
with a clever choice of timelike coordinate suggested by Y. Mino, we have
developed a simple procedure that sidesteps this difficulty. One first Fourier
expands all quantities using Mino's time coordinate . In particular,
the observer's time is decomposed with . The frequency domain
description is then built from the -Fourier expansion and the
expansion of . We have found this procedure to be quite simple to implement,
and to be applicable to a wide class of functionals. We test the procedure
using a simple test function, and then apply it in a particularly interesting
case, the Weyl curvature scalar used in black hole perturbation
theory.Comment: 16 pages, 2 figures. Submitted to Phys Rev D. New version gives a
vastly improved algorithm due to Drasco for computing the Fourier transforms.
Drasco has been added as an author. Also fixed some references and
exterminated a small herd of typos; final published versio
Efficient Convex Algorithms for Universal Kernel Learning
The accuracy and complexity of machine learning algorithms based on kernel
optimization are determined by the set of kernels over which they are able to
optimize. An ideal set of kernels should: admit a linear parameterization (for
tractability); be dense in the set of all kernels (for robustness); be
universal (for accuracy). Recently, a framework was proposed for using positive
matrices to parameterize a class of positive semi-separable kernels. Although
this class can be shown to meet all three criteria, previous algorithms for
optimization of such kernels were limited to classification and furthermore
relied on computationally complex Semidefinite Programming (SDP) algorithms. In
this paper, we pose the problem of learning semiseparable kernels as a minimax
optimization problem and propose a SVD-QCQP primal-dual algorithm which
dramatically reduces the computational complexity as compared with previous
SDP-based approaches. Furthermore, we provide an efficient implementation of
this algorithm for both classification and regression -- an implementation
which enables us to solve problems with 100 features and up to 30,000 datums.
Finally, when applied to benchmark data, the algorithm demonstrates the
potential for significant improvement in accuracy over typical (but non-convex)
approaches such as Neural Nets and Random Forest with similar or better
computation time
Time-dependent wave-packet approach for fusion reactions of halo nuclei
The fusion reaction of a halo nucleus 11Be on 208Pb is described by a
three-body direct reaction model. A time-dependent wave packet approach is
applied to a three-body reaction problem. The wave packet approach enables us
to obtain scattering solutions without considering the three-body scattering
boundary conditions. The time evolution of the wave packet also helps us to
obtain intuitive understanding of the reaction dynamics. The calculations
indicate a decrease of the fusion probability by the presence of the halo
neutron.Comment: 7 pages, 3 figures, use espcrc1.sty, Talk at the International
Symposium on "Physics of Unstable Nuclei (ISPUN02)", Halong Bay, Vietnam,
November 20-25, 200
Extranuclear X-ray Emission in the Edge-on Seyfert Galaxy NGC 2992
We found several extranuclear (r >~ 3") X-ray nebulae within 40" (6.3 kpc at
32.5 Mpc) of the nucleus of the Seyfert galaxy NGC 2992. The net X-ray
luminosity from the extranuclear sources is ~2-3 E39 erg/s (0.3-8.0 keV). The
X-ray core itself (r <~ 1") is positioned at 9:45:41.95 -14:19:34.8 (J2000) and
has a remarkably simple power-law spectrum with photon index Gamma=1.86 and
Nh=7E21 /cm2. The near-nuclear (3" <~ r <~ 18") Chandra spectrum is best
modelled by three components: (1) a direct AGN component with Gamma fixed at
1.86, (2) cold Compton reflection of the AGN component, and (3) a 0.5 keV
low-abundance (Z < 0.03 Zsolar) "thermal plasma," with ~10% of the flux of
either of the first two components. The X-ray luminosity of the 3rd component
(the "soft excess") is ~1.4E40 erg/s, or ~5X that of all of the detected
extranuclear X-ray sources. We suggest that most (~75-80%) of the soft excess
emission originates from 1" < r < 3", which is not imaged in our observation
due to severe CCD pile-up. We also require the cold reflector to be positioned
at least 1" (158 pc) from the nucleus, since there is no reflection component
in the X-ray core spectrum. Much of the extranuclear X-ray emission is
coincident with radio structures (nuclear radio bubbles and large-scale radio
features), and its soft X-ray luminosity is generally consistent with
luminosities expected from a starburst-driven wind (with the starburst scaled
from L_FIR). However, the AGN in NGC 2992 seems equally likely to power the
galactic wind in that object. Furthermore, AGN photoionization and
photoexcitation processes could dominate the soft excess, especially the
\~75-80% which is not imaged by our observations.Comment: 34 pages AASTEX, 9 (low-res) PS figures, ApJ, in press. For
full-resolution postscript file, visit
http://www.pha.jhu.edu/~colbert/n2992_chandra.ps.g
Investigating a Potential Relationship Between Distinct Cancer-Associated Lactobacillus iners and Chemoradiotherapy Resistance in Cervical Cancer Patients
https://openworks.mdanderson.org/sumexp22/1138/thumbnail.jp
A new superwind galaxy: XMM-Newton observations of NGC 6810
We present the first imaging X-ray observation of the highly inclined (i = 78
deg) Sab Seyfert 2 galaxy NGC 6810 using XMM-Newton, which reveals soft X-ray
emission that extends out to a projected height of ~7 kpc away from the plane
of the galaxy. The soft X-ray emission beyond the optical disk of the galaxy is
most plausibly extra-planar, although it could instead come from large galactic
radius. This extended X-ray emission is spatially associated with diffuse
H-alpha emission, in particular with a prominent 5-kpc-long H-alpha filament on
the north-west of the disk. A fraction <~35% of the total soft X-ray emission
of the galaxy arises from projected heights |z| > 2 kpc. Within the optical
disk of the galaxy the soft X-ray emission is associated with the star-forming
regions visible in ground-based H-alpha and XMM-Newton Optical Monitor near-UV
imaging. The temperature, super-Solar alpha-element-to-iron abundance ratio,
soft X-ray/H-alpha correlation, and X-ray to far-IR flux ratio of NGC 6810 are
all consistent with local starbursts with winds, although the large base radius
of the outflow would make NGC 6810 one of the few ``disk-wide'' superwinds
currently known. Hard X-ray emission from NGC 6810 is weak, and the total
E=2-10 keV luminosity and spectral shape are consistent with the expected level
of X-ray binary emission from the old and young stellar populations. The X-ray
observations provide no evidence of any AGN activity. We find that the optical,
IR and radio properties of NGC 6810 are all consistent with a starburst galaxy,
and that the old classification of this galaxy as a Seyfert 2 galaxy is
probably incorrect.Comment: Accepted for publication in MNRAS. 12 pages including
jpeg-encapsulated ps files, full resolution version available at
http://proteus.pha.jhu.edu/~dks/dks_published.htm
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