54,764 research outputs found
Pattern Identification - A Foundation for Research in the Emphasis of Design Patterns in Systems Engineering and Knowledge Capture
Pattern Language describes the morphology and functionality of a system in the absence of design particulars. Harnessing this capability will provide the Systems Engineering discipline a means of managing the development of increasingly complex systems with increasingly distributed design teams while capturing and retaining knowledge for future generations. Pattern Language is a syntax for describing, and structurally relating, design patterns. Design patterns contextually describe the application of domain knowledge in the engineered solution to the force balance problem. The parallels between pattern recognition and application, as a fundamental stage of human learning, and pattern observation within a complex system, suggests pattern language may be a valuable tool in the capture and dissemination of knowledge. Pattern application has enjoyed considerable study over the last several decades, however much of this work has focused on the replication of design particulars. This work returns to the roots of Pattern Language and explores the utility of patterns as an architectural description and guide, and knowledge capture method, for complex system development beginning with the identification of a time proven design pattern
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Aristelliger barbouri
Number of Pages: 1Integrative BiologyGeological Science
Powerful jets from accreting black holes: evidence from the optical and infrared
A common consequence of accretion onto black holes is the formation of
powerful, relativistic jets that escape the system. In the case of supermassive
black holes at the centres of galaxies this has been known for decades, but for
stellar-mass black holes residing within galaxies like our own, it has taken
recent advances to arrive at this conclusion. Here, a review is given of the
evidence that supports the existence of jets from accreting stellar-mass black
holes, from observations made at optical and infrared wavelengths. In
particular it is found that on occasion, jets can dominate the emission of
these systems at these wavelengths. In addition, the interactions between the
jets and the surrounding matter produce optical and infrared emission on large
scales via thermal and non-thermal processes. The evidence, implications and
applications in the context of jet physics are discussed. It is shown that many
properties of the jets can be constrained from these studies, including the
total kinetic power they contain. The main conclusion is that like the
supermassive black holes, the jet kinetic power of accreting stellar-mass black
holes is sometimes comparable to their bolometric radiative luminosity. Future
studies can test ubiquities in jet properties between objects, and attempt to
unify the properties of jets from all observable accreting black holes, i.e. of
all masses.Comment: 26 pages, 4 figures, 1 table. Invited chapter for the edited book
"Black Holes and Galaxy Formation", Nova Science Publishers, Inc., at pres
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Thecadactylus, T. rapicauda
Number of Pages: 16Integrative BiologyGeological Science
Recommended from our members
Aristelliger georgeensis
Number of Pages: 2Integrative BiologyGeological Science
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