26,075 research outputs found
Abating exhaust noises in jet engines
A noise abating improvement for jet engines including turbojets, turbofans, turboprops, ramjets, scramjets, and hybrid jets is introduced. A provision is made for an apparatus in the primary and/or secondary flow streams of the engines; the apparatus imparts to the exhaust gases a component rotation or swirl about the engine's longitudinal axis. The rotary component in the exhaust gases causes a substantial suppression of sound energy build up normally produced by an axial flow exhaust system
Minimization of jet and core noise by rotation of flow
Jet and core noise can be reduced and flame lengths may be significantly decreased when exhaust gases are caused to rotate or swirl about longitudinal axis of exhaust. Combustion in rotating flows is steady and quiet, and is not accompanied by pulsations or violent fluctuations
Rare events in networks with internal and external noise
We study rare events in networks with both internal and external noise, and
develop a general formalism for analyzing rare events that combines
pair-quenched techniques and large-deviation theory. The probability
distribution, shape, and time scale of rare events are considered in detail for
extinction in the Susceptible-Infected-Susceptible model as an illustration. We
find that when both types of noise are present, there is a crossover region as
the network size is increased, where the probability exponent for large
deviations no longer increases linearly with the network size. We demonstrate
that the form of the crossover depends on whether the endemic state is
localized near the epidemic threshold or not
Planetary film reconnaissance system
Design, fabrication, assembly of planetary film reconnaissance syste
Survey of electric power plants for space applications
Fuel and solar cells, chemical batteries, Rankine and Brayton cycle power plants, thermoelectric generators, and thermionic converters for space power application
Exploring the Feasibility of Incorporating Sexual Education into Routine Adolescent Office Visits
Preventative sexual education can reduce the negative health outcomes of sexual behavior in adolescent populations.1 The objective of this pilot study was to determine if sexual education can be delivered as a scripted five-minute module during a routine adolescent office visit in a manner that is non-disruptive of clinic flow and acceptable to both patients and providers.
• 85% of providers reported the intervention did not interrupt clinic flow
• 86% of patients reported the intervention to be appropriate and 92% of providers were satisfied overall with the intervention
These pilot data highlight that the incorporation of brief scripted sexual education into routine adolescent preventative office visits is both feasible and acceptable to patients and providers.https://jdc.jefferson.edu/cwicposters/1024/thumbnail.jp
Fourier transform and rigidity of certain distributions
Let be a finite dimensional vector space over a local field, and be
its dual. For a closed subset of , and of , consider the space
of tempered distributions on whose support are contained
in and support of whose Fourier transform are contained in . We show
that possesses a certain rigidity property, for ,
which are some finite unions of affine subspaces.Comment: 10 page
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