49,624 research outputs found
Commentary on Moving Beyond Lip Service: The Clinical Reasoning Behind Practicing Strengths
Invited Commentary on Moving Beyond Lip Service: The Clinical Reasoning Behind Practicing Strength
High energy X-ray results from HEAO-1: X-ray pulsars, and the all sky survey
Results of the sky survey performed with the high energy X-ray detectors of the A-4 experiment onboard the HEAO 1 spacecraft are presented. The data presented cover the energy range from 13 to 80 keV. Strong sources are identified by visual inspection and azimuthal superpositions are performed in order to find weak sources. Time variability is also examined. Results of studies of X-ray pulsars are given including a brief description of an X-ray pulsar in terms of current theory
Management of large-scale technology
Two major themes are addressed in this assessment of the management of large-scale NASA programs: (1) how a high technology agency was a decade marked by a rapid expansion of funds and manpower in the first half and almost as rapid contraction in the second; and (2) how NASA combined central planning and control with decentralized project execution
Automatically detecting neighbourhood constraint interactions using Comet
Local Search has been shown to be capable of producing high quality solutions in a variety of hard constraint and optimisation problems. Typically implementing a Local Search algorithm is done in a problem specic manner. In the last few years a variety of approaches have emerged focussed on easing the implementation and creating a clean separation between the algorithm and problem. We present a system which can deduce information about the interactions between problem constraints and the search neighbourhoods whilst maintaining a loose coupling between these components. We apply this technique to the International Timetabling Competition instances and show an implementation expressed in Comet
The NASA/Baltimore Applications Project (BAP). Computer aided dispatch and communications system for the Baltimore Fire Department: A case study of urban technology application
An engineer and a computer expert from Goddard Space Flight Center were assigned to provide technical assistance in the design and installation of a computer assisted system for dispatching and communicating with fire department personnel and equipment in Baltimore City. Primary contributions were in decision making and management processes. The project is analyzed from four perspectives: (1) fire service; (2) technology transfer; (3) public administration; and (5) innovation. The city benefitted substantially from the approach and competence of the NASA personnel. Given the proper conditions, there are distinct advantages in having a nearby Federal laboratory provide assistance to a city on a continuing basis, as is done in the Baltimore Applications Project
Properties of Cooperatively Induced Phases in Sensing Models
A large number of eukaryotic cells are able to directly detect external
chemical gradients with great accuracy and the ultimate limit to their
sensitivity has been a topic of debate for many years. Previous work has been
done to understand many aspects of this process but little attention has been
paid to the possibility of emergent sensing states. Here we examine how
cooperation between sensors existing in a two dimensional network, as they do
on the cell's surface, can both enhance and fundamentally alter the response of
the cell to a spatially varying signal. We show that weakly interacting sensors
linearly amplify the sensors response to an external gradient while a network
of strongly interacting sensors form a collective non-linear response with two
separate domains of active and inactive sensors forming what have called a
"1/2-state" . In our analysis we examine the cell's ability to sense the
direction of a signal and pay special attention to the substantially different
behavior realized in the strongly interacting regime.Comment: 8 pages, 5 figure
Comment: On Random Scan Gibbs Samplers
Comment on ``On Random Scan Gibbs Samplers'' [arXiv:0808.3852]Comment: Published in at http://dx.doi.org/10.1214/08-STS252B the Statistical
Science (http://www.imstat.org/sts/) by the Institute of Mathematical
Statistics (http://www.imstat.org
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