Maneuvering the Dual Mode Manned/Automated Lunar Roving Vehicle, June 1969 - March 1970

Digital maps of hazards to movement for dual mode Lunar Roving Vehicl

Quantum isolated horizons and black hole entropy

We give a short introduction to the approaches currently used to describe black holes in loop quantum gravity. We will concentrate on the classical issues related to the modeling of black holes as isolated horizons, give a short discussion of their canonical quantization by using loop quantum gravity techniques, and a description of the combinatorial methods necessary to solve the counting problems involved in the computation of the entropy.Comment: 28 pages in A4 format. Contribution to the Proceedings of the 3rd Quantum Geometry and Quantum Gravity School in Zakopane (2011

End-User Perceptions of Intelligence Dissemination from a State Fusion Center

This research examines end-user perceptions of an intelligence product disseminated from a state fusion center in the Northeast region of the United States. The current literature suffers from an empirical gap within the arena of contemporary law enforcement intelligence; largely because of the difficulty of obtaining data related to such practices. This research informs this gap and provides insights into local law enforcement intelligence sharing. Descriptive statistics and interview narratives are presented. Original survey data was collected from a sample of law enforcement agencies subscribed to the fusion center’s intelligence listserv. Random interviews with survey respondents were also conducted and NVivo software was utilized to develop qualitative constructs. Findings indicate the intelligence product is read daily and perceived to be moderately useful by recipients. End users are primarily concerned with jurisdiction-specific and officer safety-related information. Upper-level administrators are the organizational lynchpins for funneling information to patrol officers

Isolated Horizon, Killing Horizon and Event Horizon

We consider space-times which in addition to admitting an isolated horizon also admit Killing horizons with or without an event horizon. We show that an isolated horizon is a Killing horizon provided either (1) it admits a stationary neighbourhood or (2) it admits a neighbourhood with two independent, commuting Killing vectors. A Killing horizon is always an isolated horizon. For the case when an event horizon is definable, all conceivable relative locations of isolated horizon and event horizons are possible. Corresponding conditions are given.Comment: 14 pages, Latex, no figures. Some arguments tightened. To appear in Class. Quant. Gra

Modelling of the radio spectrum evolution in the binary pulsar B1259−-63

In this paper we give the first attempt to model the evolution of the spectrum of PSR B1259$-$63 radio emission while the pulsar orbits the companion Be star. As suggested by Kijak et al. (Mon. Not. R. Astron. Soc. 418:L114, 2011a) this binary system can be useful in understanding the origin of the gigahertz-peaked spectrum of pulsars. The model explains, at least qualitatively, the observed alterations of the spectral shape depending on the orbital phases of this pulsar. Thus, our results support the hypothesis that the external factors have a significant impact on the observed radio emission of a pulsar. The model can also contribute to our understanding of the origin of some non-typical spectral shapes(e.g. flat or broken spectra).Comment: 9 pages, 2 tables, 3 figure

From Crystalline to Amorphous Germania Bilayer Films at the Atomic Scale: Preparation and Characterization

A new two-dimensional (2D) germanium dioxide film has been prepared. The film consists of interconnected germania tetrahedral units forming a bilayer structure, weakly coupled to the supporting Pt(111) metal-substrate. Density functional theory calculations predict a stable structure of 558-membered rings for germania films, while for silica films 6-membered rings are preferred. By varying the preparation conditions the degree of order in the germania films is tuned. Crystalline, intermediate ordered and purely amorphous film structures are resolved by analysing scanning tunnelling microscopy images

Disparity between Fusion Center Web Content and Self-Reported Activity

The fusion center literature is limited and lacks consensus regarding operational focus and strategic priorities. Perhaps the lone consistent finding in this literature is the lack of awareness among outsiders regarding what fusion centers do and the capabilities they provide. Contemporary communication research indicates the Internet serves as the primary source of information to inform what they do not understand. The present study employs a mixed methods approach that combines a content analysis of fusion center web content with fusion center self-report data gleaned from a federally funded project. This study encompasses 74 of the 77 primary and officially recognized fusion centers in the United States. Results indicate that centers provide limited information online about their organization and significantly underreport their activities and capabilities online in comparison to self-reported tasks. Information available online through official fusion centers websites is poor at best. Fusion centers self-report to engage in tasks consistent with their information sharing and analytic mission. A context for the findings is provided in addition to recommendations and study limitations

SO(4,C)-covariant Ashtekar-Barbero gravity and the Immirzi parameter

An so(4,C)-covariant hamiltonian formulation of a family of generalized Hilbert-Palatini actions depending on a parameter (the so called Immirzi parameter) is developed. It encompasses the Ashtekar-Barbero gravity which serves as a basis of quantum loop gravity. Dirac quantization of this system is constructed. Next we study dependence of the quantum system on the Immirzi parameter. The path integral quantization shows no dependence on it. A way to modify the loop approach in the accordance with the formalism developed here is briefly outlined.Comment: 14 pages, LATEX; minor changes; misprints corrected; commutator of two secondary second class constraints correcte

The Utility of Fusion Centres to Enhance Intelligence-Led Policing: An Exploration of End-Users

A developing literature on intelligence-led policing (ILP) and law enforcement fusion centres contends that intelligence and data-driven policing practices can be enhanced through improved intelligence dissemination from fusion centres. The literature has remained relatively silent on the extent to which law enforcement has connectivity with fusion centres, perceive fusion centre products to be useful, and further share intelligence products within their agency. The present study informs this knowledge gap using data gathered via an online survey of law enforcement subscribed to receive fusion centre products. Bivariate logistic regression models showed that rural agencies tend to be the most informed about the fusion centre of study while a disconnect was observed between the fusion centre with respect to frontline personnel and analysts; especially in urban police, health, and fire organizations. Implications for research and practice are discussed