2,500 research outputs found
Use of altimetry data in a sampling-function approach to the geoid
Problems associated with using an altimetry sampling function approach to the geoid are examined. They include: (1) conventent mathematical representation of short-wavelength (eventually approximately 1 deg) features of the geoid or geopotential, (2) utilization of detailed data from only part of the globe (i.e., the oceans) (3) application of appropriate formalism to relate the sea-level equipotential below the atmospheric mass to the external potential above the atmosphere, (4) mathematical applicability of an adopted geopotential representation on the surface of the physical geoid
Foreign Direct Investment Response Following Intellectual Property Rights Reform
Over the past several decades, Foreign Direct Investment (FDI) flows across the globe have increased markedly. During this same period, a large number of countries have strengthened their Intellectual Property Rights (IPRs) regimes in response to global legislative changes such as the Agreement of Trade-Related Aspects of IPRs or domestic policy initiatives. In this thesis, I empirically investigate the impact of IPR reform on FDI activity. I use a panel data set that consist of FDI flows from Germany and US into 15 host countries over a 24 year time period. As a proxy for IPR regime change I use the patent reform dummy developed by Branstetter et al. (2006, QJE). I use a difference-in-difference regression approach, accounting for fixed country effects and fixed time effects. I also control for GDP per-capita, GDP, real-exchange rate and trade openness. The results imply that following IPR reform there is a statistically significant and quantitatively substantial increase in FDI inflows. The findings are robust under a number of different specifications. In addition, I find that richer countries receive higher levels of FDI inflows following IPR reform using U.S parent data. However, following IPR reform, with German parent data indicates that richer countries receive lower levels of FDI
Geodetic research studies Final technical report
Geopotential surface measurement of ocean using altimeter dat
Possible geopotential improvement from satellite altimetry
Possible geopotential improvement from satellite altimetr
The procurement and evaluation of a prototype laser satellite-tracking system Final report, 1 Jan. 1967 - 30 Sep. 1968
Pulsed ruby laser satellite tracking syste
Guiding of Rydberg atoms in a high-gradient magnetic guide
We study the guiding of Rb 59D Rydberg atoms in a linear,
high-gradient, two-wire magnetic guide. Time delayed microwave ionization and
ion detection are used to probe the Rydberg atom motion. We observe guiding of
Rydberg atoms over a period of 5 ms following excitation. The decay time of the
guided atom signal is about five times that of the initial state. We attribute
the lifetime increase to an initial phase of -changing collisions and
thermally induced Rydberg-Rydberg transitions. Detailed simulations of Rydberg
atom guiding reproduce most experimental observations and offer insight into
the internal-state evolution
Method and apparatus for controlling an earthworking implement to preserve a crown on a road surface
A method and apparatus for controlling an earthworking implement on an earthworking machine to preserve a crown on the surface of a road, including determining the position of the crown on the road surface, choosing a sloped grade on one side of the crown, positioning the earthworking implement on the sloped grade so that a first end of the earthworking implement is on the road surface. The processor determines a desired position of a second end of the earthworking implement so that the second end overlaps the crown and the earthworking implement does not cut the crown
Investigation of Dynamics of Self-Similarly Evolving Magnetic Clouds
Magnetic clouds (MCs) are "magnetized plasma clouds" moving in the solar
wind. MCs transport magnetic flux and helicity away from the Sun. These
structures are not stationary but feature temporal evolution. Commonly,
simplified MC models are considered. The goal of the present study is to
investigate the dynamics of more general, radially expanding MCs. They are
considered as cylindrically symmetric magnetic structures with low plasma
{\beta}. In order to study MC`evolution the self-similar approach method and a
numerical approach are used. It is shown that the forces are balanced in the
considered self-similarly evolving, cylindrically symmetric magnetic
structures. Explicit analytical expressions for magnetic field, plasma
velocity, density and pressure within MCs are derived. These solutions are
characterized by conserved values of magnetic flux and helicity. We also
investigate the dynamics of self-similarly evolving MCs by means of the
numerical code "Graale". In addition, their expansion in a medium with higher
density and higher plasma {\beta} is studied. It is shown that the physical
parameters of the MCs maintain their self-similar character throughout their
evolution. Conclusions. A comparison of the different self-similar and
numerical solutions allows us to conclude that the evolving MCs are quite
adequately described by our self-similar solutions - they retain their
self-similar, coherent nature for quite a long time and over large distances
from the Sun
National Geodetic Satellite Program, Part II: Smithsonian Astrophysical Observatory
A sequence of advances in the determination of geodetic parameters presented by the Smithsonian Astrophysical Observatory are described. A Baker-Nunn photographic system was used in addition to a ruby-laser ranging system to obtain data for refinement of geodetic parameters. A summary of the data employed to: (1) derive coordinates for the locations of various tracking stations; and (2) determine the gravitational potential of the earth, is presented
Dimensional stability of curved panels with cocured stiffeners and cobonded frames
Closed form and finite element analyses are presented for axial direction and transverse direction dimensional stability of skin/stringer panels. Several sensitivity studies are presented to illustrate the influence of various design parameters on the dimensional stability of these panels. Panel geometry, material properties (stiffness and coefficient of thermal expansion), restraint conditions and local details, such as resin fillets, all combine to influence dimensional stability, residual and assembly forces
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