2,253 research outputs found
Asymptotic silence-breaking singularities
We discuss three complementary aspects of scalar curvature singularities:
asymptotic causal properties, asymptotic Ricci and Weyl curvature, and
asymptotic spatial properties. We divide scalar curvature singularities into
two classes: so-called asymptotically silent singularities and non-generic
singularities that break asymptotic silence. The emphasis in this paper is on
the latter class which have not been previously discussed. We illustrate the
above aspects and concepts by describing the singularities of a number of
representative explicit perfect fluid solutions.Comment: 25 pages, 6 figure
Impact pressure probe response characteristics in high speed flows, with transition Knudsen numbers
Impact pressure probe response characteristics in free-molecular and continuum flows with transition Knudsen number
Impact pressure probe reponse characteristics in high speed flows with transition knudsen numbers
Impact pressure probe response characteristics in high speed flows with transition Knudsen number
Exhaust jet wake and thrust characteristics of several nozzles designed for VTOL DOWNWASH suppression. Tests in and out of ground effect with 70 deg F and 1200 deg F nozzle discharge temperatures
Jet wake degradation and thrust characteristics of exhaust nozzles designed for VTOL downwash suppression and fuselage and ground effect
New Non-Diagonal Singularity-Free Cosmological Perfect-Fluid Solution
We present a new non-diagonal G2 inhomogeneous perfect-fluid solution with
barotropic equation of state p=rho and positive density everywhere. It
satisfies the global hyperbolicity condition and has no curvature singularity
anywhere. This solution is very simple in form and has two arbitrary constants.Comment: Latex, no figure
Controlled growth of organic semiconductor films in liquid
Organic molecular crystalline (OMC) films are being investigated for use in a wide range of potential applications, from field effect transistors, to light-emitting diodes, and photovoltaic cells. The ultimate utility of OMC materials for such applications will depend on the degree and type of molecular order in deposited films, as well as the processing costs for preparing them. The goal of this thesis is to develop a method to produce high quality OMC thin films under ambient conditions, to characterize those films, and their growth kinetics. In particular, I will investigate OMC film growth by ambient axisymmetric spray method, a technique in which an organic semiconductor is sublimated into a carrier gas at ambient pressure and deposited onto a substrate coated with a thin liquid layer. I will examine the growth kinetics and morphologies of the resulting films. The results of this research will be an improved understanding of the growth of organic crystals in a thin film of liquid and the production of cheap organic semiconductor thin films
Why the biopsychosocial model needs to be the underpinning philosophy in rehabilitation pathways for patients recovering from COVID-19
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