32,042 research outputs found
Geometrically nonlinear static and dynamic analysis of arbitrarily loaded shells of revolution
Computer program on axisymmetric response of shells with other meridional geometries and response of shells subjected to asymmetric loads is described. Description of theory, method of solution, instructions for preparing input data, and two sample problems to illustrate data preparation and output format are included
Requirements and Capabilities for Planetary Missions: Mariner Encke Ballistic Flyby 1980
This mission will provide a broad-based fast reconnaissance of comet Encke, building a data base for subsequent more detailed comet investigations, including rendezvous. After a 3 month flight, the spacecraft will encounter the comet at a nominal range of about 500 km. Flyby velocity will be 7 to 28 km/sec depending on choice of arrival data (0 to 35 days before Encke perihelion) and launch vehicle. The spacecraft will be similar to the MVM 73 spacecraft, with scan platform and 117 kbps encounter data rate, and designed to survive the thermal environment of 0.34 to 0.8 AU
Requirements and capabilities for planetary missions. Volume 2: Mars polar orbiter penetrator 1981
The Mars Polar Orbiter/Penetrator 1981 mission, intended to investigate the manner in which Mars has evolved, and which surveys its geochemistry, performs climatological investigations, and attempts to determine the planet's gravitational field, was described. The spacecraft, modified from the Viking Orbiter design, carries a new remote-sensing payload and six penetrators. The penetrators are released from a 2.46-h, 1000-km sun synchronous circular orbit and interrogated daily throughout the 2-year orbital mission. X-band telemetry is used to increase data return
Interaction of martensitic microstructures in adjacent grains
It is often observed that martensitic microstructures in adjacent polycrystal
grains are related. For example, micrographs of Arlt exhibit propagation of
layered structures across grain boundaries in the cubic-to-tetragonal phase
transformation in . Such observations are related to requirements
of compatibility of the deformation at the grain boundary. Using a
generalization of the Hadamard jump condition, this is explored in the
nonlinear elasticity model of martensitic transformations for the case of a
bicrystal with suitably oriented columnar geometry, in which the microstructure
in both grains is assumed to involve just two martensitic variants, with a
planar or non-planar interface between the grains.Comment: 6 pages, 1 figure, submitted to ICOMAT 2017 Proceeding
The Regularization of the Fermion Determinant in Chiral Quark Models
The momentum dependence of the quark self energy gives a physically motivated
and consistent regularization of both the real and imaginary parts of the quark
loop contribution to the meson action. We show that the amplitudes for
anomalous processes are always reproduced correctly.Comment: 12/8 pages (b/l), plain TeX with harvmac, SphT93/13
Imperfect Information and Staggered Price Setting
Many Keynesian macroeconomic models are based on the assumption that firms change prices at different times. This paper presents an explanation for this "staggered" price setting. We develop a model in which firms have imperfect knowledge of the current state of the economy and gain information by observing the prices set by others. This gives each firm an incentive to set its price shortly after as many firms as possible. Staggering can be the equilibrium outcome. In addition, the information gains can make staggering socially optimal even though it increases aggregate fluctuations.
Inflation and Uncertainty at Long and Short Horizons
macroeconomics, Inflation, Uncertainty, Long Horizons, Short Horizons
A method for putting chiral fermions on the lattice
We describe a method to put chiral gauge theories on the lattice. Our method
makes heavy use of the effective action for chiral fermions in the continuum,
which is in general complex. As an example we discuss the chiral Schwinger
model.Comment: 4 pages, HLRZ 92-8
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