320,827 research outputs found
Experiences and issues for environmental science sensor network deployments
Sensor network research is a large and growing area of academic effort, examining technological and deployment issues in the area of environmental monitoring. These technologies are used by environmental engineers and scientists to monitor a multiplicity of environments and services, and, specific to this paper, energy and water supplied to the built environment. Although the technology is developed by Computer Science specialists, the use and deployment is traditionally performed by environmental engineers. This paper examines deployment from the perspectives of environmental engineers and scientists and asks what computer scientists can do to improve the process. The paper uses a case study to demonstrate the agile operation of WSNs within the Cloud Computing infrastructure, and thus the demand-driven, collaboration-intense paradigm of Digital Ecosystems in Complex Environments
Wilson lines and UV sensitivity in magnetic compactifications
We investigate the ultraviolet (UV) behaviour of 6D N=1 supersymmetric
effective (Abelian) gauge theories compactified on a two-torus () with
magnetic flux. To this purpose we compute offshell the one-loop correction to
the Wilson line state self-energy. The offshell calculation is actually
necessary to capture the usual effective field theory expansion in powers of
. Particular care is paid to the regularization of the
(divergent) momentum integrals, which is relevant for identifying the
corresponding counterterm(s). We find a counterterm which is a new higher
dimensional effective operator of dimension d=6, that is enhanced for a larger
compactification area (where the effective theory applies) and is consistent
with the symmetries of the theory. Its consequences are briefly discussed and
comparison is made with orbifold compactifications without flux.Comment: 12 pages, 1 figure; (v2: added references and paragraph on page 7
Experiences and issues for environmental engineering sensor network deployments
Sensor network research is a large and growing area of academic effort, examining technological and deployment issues in the area of environmental monitoring. These technologies are used by environmental engineers and scientists to monitor a multiplicity of environments and services, and, specific to this paper, energy and water supplied to the built environment. Although the technology is developed by Computer Science specialists, the use and deployment is traditionally performed by environmental engineers. This paper examines deployment from the perspectives of environmental engineers and scientists and asks what computer scientists can do to improve the process. The paper uses a case study to demonstrate the agile operation of WSNs within the Cloud Computing infrastructure, and thus the demand-driven, collaboration-intense paradigm of Digital Ecosystems in Complex Environments
Computer program TRACK performs transient and/or steady state thermal analysis with coupled fluid flow and heat conduction
Computer program called TRACK was developed by combining a transient fluid flow computer code and the existing modified TOSS heat conduction code to perform the computation
Evaluating foam heterogeneity
New analytical tool is available to calculate the degree of foam heterogeneity based on the measurement of gas diffusivity values. Diffusion characteristics of plastic foam are described by a system of differential equations based on conventional diffusion theory. This approach saves research and computation time in studying mass or heat diffusion problems
An economical vent cover
Inexpensive formed-plastic vent cover has been developed that allows controlled purge of vent systems and also provides blowout protection. Cover can also be used in relief mode to allow normal system relief flows without disengaging from vent system. Cover consists of two parts made of plastics with varying densities to fit media used and desired pressures
Contemplating workplace change: evolving individual thought processes and emergent story lines
Drawing on topical life histories of physicians in a particularly volatile public health
sector environment, we build theory around the contemplation of workplace change.
Overall, our study provides evidence as to why single or multiple independent factors,
such as pay or job structure, may fail to predict or explain individual decisions to stay
in or change workplaces. Instead, the contemplation process we argue is a complex,
evolutionary, and context-dependent one that requires individualized interventions.
Our findings reveal the prevalence of episodic context-self fit assessments prompted
by triggering stimuli, two mechanisms by which thought processes evolved
(reinforcement and recalibration), and four characteristic story lines that explain
why the thought processes manifested as they did (exploring opportunities, solving
problems, reconciling incongruence, and escaping situations). Based on our findings,
we encourage practitioners to regularly engage in story-listening and dialogic
conversations to better understand, and potentially affect the evolving socially
constructed realities of staff members
Vibrating-chamber levitation systems
Systems are described for the acoustic levitation of objects, which enable the use of a sealed rigid chamber to avoid contamination of the levitated object. The apparatus includes a housing forming a substantially closed chamber, and means for vibrating the entire housing at a frequency that produces an acoustic standing wave pattern within the chamber
A Possible Origin of Dark Energy
We discuss the possibility that the existence of dark energy may be due to
the presence of a spin zero field , either elementary or composite. In
the presence of other matter field, the transformation
constant can generate a negative pressure, like the cosmological constant. In
this picture, our universe can be thought as a very large bag, similar to the
much smaller MIT bag model for a single nucleon.Comment: 4 pages, no figure, typos correcte
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