133,723 research outputs found
NASTRAN buckling study of a linear induction motor reaction rail
NASTRAN was used to study problems associated with the installation of a linear induction motor reaction rail test track. Specific problems studied include determination of the critical axial compressive buckling stress and establishment of the lateral stiffness of the reaction rail under combined loads. NASTRAN results were compared with experimentally obtained values and satisfactory agreement was obtained. The reaction rail was found to buckle at an axial compressive stress of 11,400 pounds per square inch. The results of this investigation were used to select procedures for installation of the reaction rail
Light intensity strain analysis
A process is described for the analysis of the strain field of structures subjected to large deformations involving a low modulus substrate having a high modulus, relatively thin coating. The optical properties of transmittance and reflectance are measured for the coated substrate while stressed and unstressed to indicate the strain field for the coated substrate
Probing the Structure of the Pomeron
We suggest that the pseudo-rapidity cut dependence of diffractive
deep-inelastic scattering events at HERA may provide a sensitive test of models
of diffraction. A comparison with the experimental cross section shows that the
Donnachie-Landshoff model and a simple two-gluon exchange model of the pomeron
model are disfavoured. However a model with a direct coupling of the pomeron to
quarks is viable for a harder quark--pomeron form factor, as is a model based
on the leading-twist operator contribution. We also consider a direct-coupling
scalar pomeron model. We comment on the implications of these results for the
determination of the partonic structure of the pomeron.Comment: 33 pages, LaTeX2e, 14 figures, uses axodra
Degree supervaluational logic
Supervaluationism is often described as the most popular semantic treatment of indeterminacy. There???s little consensus, however, about how to fill out the bare-bones idea to include a characterization of logical consequence. The paper explores one methodology for choosing between the logics: pick a logic that norms belief as classical consequence is standardly thought to do. The main focus of the paper considers a variant of standard supervaluational, on which we can characterize degrees of determinacy. It applies the methodology above to focus on degree logic. This is developed first in a basic, single-premise case; and then extended to the multipremise case, and to allow degrees of consequence. The metatheoretic properties of degree logic are set out. On the positive side, the logic is supraclassical???all classical valid sequents are degree logic valid. Strikingly, metarules such as cut and conjunction introduction fail
The Tits alternative for generalized triangle groups of type (3, 4, 2)
A generalized triangle group is a group that can be presented in the form G = h x, y | xp = yq = w(x, y)r = 1 i where p, q, r ? 2 and w(x, y) is a cyclically reduced word of length at least 2 in the free product Zp ? Zq = h x, y | xp = yq = 1i. Rosenberger has conjectured that every generalized triangle group G satisfies the Tits alternative. It is known that the conjecture holds except possibly when the triple (p, q, r) is one of (2, 3, 2), (2, 4, 2), (2, 5, 2), (3, 3, 2), (3, 4, 2), or (3, 5, 2). Building on a result of Benyash-Krivets and Barkovich from this journal, we show that the Tits alternative holds in the case (p, q, r) = (3, 4, 2)
Eligibility and inscrutability
The philosophy of intentionality asks questions such as: in virtue of what
does a sentence, picture, or mental state represent that the world is a certain
way? The subquestion I focus upon here concerns the semantic properties
of language: in virtue of what does a name such as ‘London’ refer
to something or a predicate such as ‘is large’ apply to some object?
This essay examines one kind of answer to this “metasemantic”1
question: interpretationism, instances of which have been proposed by
Donald Davidson, David Lewis, and others. I characterize the “twostep”
form common to such approaches and briefl y say how two versions
described by David Lewis fi t this pattern. Then I describe a fundamental
challenge to this approach: a “permutation argument” that contends,
by interpretationist lights, there can be no fact of the matter about lexical
content (e.g., what individual words refer to). Such a thesis cannot be sustained,
so the argument threatens a reductio of interpretationism.
In the second part of the article, I will give what I take to be the
best interpretationist response to the inscrutability paradox: David Lewis’s
appeal to the differential “eligibility” of semantic theories. I contend that,
given an independently plausible formulation of interpretationism, the
eligibility response is an immediate consequence of Lewis’s general analysis
of the theoretical virtue of simplicity.
In the fi nal sections of the article, I examine the limitations of Lewis’s
response. By focusing on an alternative argument for the inscrutability
of reference, I am able to describe conditions under which the eligibility
result will deliver the wrong results. In particular, if the world is complex
enough and our language suffi ciently simple, then reference may
be determinately secured to the wrong things
Astrometric observations of comets and minor planets
Comets and planet crossing asteroids are observed so that accurate positions can be determined. The observations are made with the Palomar 1.5 m telescope equipped with a CCD array. The combination of telescope and detector is quite effective at recording faint comets and minor planets. This proves useful for early acquisition of comets and asteroids returning for a new opposition. The resulting positions permit accurate orbits to be determined and allow the properties of the comets and asteroids to be measured by other observers using a variety of techniques. Recoveries and other notable observations of comets and planet crossing asteroids observed during the past years are discussed
Experimental Design for the LATOR Mission
This paper discusses experimental design for the Laser Astrometric Test Of
Relativity (LATOR) mission. LATOR is designed to reach unprecedented accuracy
of 1 part in 10^8 in measuring the curvature of the solar gravitational field
as given by the value of the key Eddington post-Newtonian parameter \gamma.
This mission will demonstrate the accuracy needed to measure effects of the
next post-Newtonian order (~G^2) of light deflection resulting from gravity's
intrinsic non-linearity. LATOR will provide the first precise measurement of
the solar quadrupole moment parameter, J2, and will improve determination of a
variety of relativistic effects including Lense-Thirring precession. The
mission will benefit from the recent progress in the optical communication
technologies -- the immediate and natural step above the standard radio-metric
techniques. The key element of LATOR is a geometric redundancy provided by the
laser ranging and long-baseline optical interferometry. We discuss the mission
and optical designs, as well as the expected performance of this proposed
mission. LATOR will lead to very robust advances in the tests of Fundamental
physics: this mission could discover a violation or extension of general
relativity, or reveal the presence of an additional long range interaction in
the physical law. There are no analogs to the LATOR experiment; it is unique
and is a natural culmination of solar system gravity experiments.Comment: 16 pages, 17 figures, invited talk given at ``The 2004 NASA/JPL
Workshop on Physics for Planetary Exploration.'' April 20-22, 2004, Solvang,
C
Bird Migration Through A Mountain Pass Studied With High Resolution Radar, Ceilometers, And Census
Autumnal migration was studied with high-resolution radar, ceilometer, and daily census in the area of Franconia Notch, a major pass in the northern Appalachian Mountains. Under synoptic conditions favorable for migration, broadfront movements of migrants toward the south passed over the mountains, often above a temperature inversion. Birds at lower elevations appeared to be influenced by local topography. Birds moving southwest were concentrated along the face of the mountain range. Birds appeared to deviate their flights to follow local topography through the pass. Specific migratory behavior was not associated with species or species groups. Under synoptic conditions unfavorable for southward migration, multimodal movements probably associated with local flights were as dense as the southward migrations described above. Avian migrants reacting to local terrain may result in concentrations of migrants over ridge summits or other topographic features
Space-based tests of gravity with laser ranging
Existing capabilities in laser ranging, optical interferometry and metrology,
in combination with precision frequency standards, atom-based quantum sensors,
and drag-free technologies, are critical for the space-based tests of
fundamental physics; as a result, of the recent progress in these disciplines,
the entire area is poised for major advances. Thus, accurate ranging to the
Moon and Mars will provide significant improvements in several gravity tests,
namely the equivalence principle, geodetic precession, PPN parameters
and , and possible variation of the gravitational constant . Other
tests will become possible with development of an optical architecture that
would allow proceeding from meter to centimeter to millimeter range accuracies
on interplanetary distances. Motivated by anticipated accuracy gains, we
discuss the recent renaissance in lunar laser ranging and consider future
relativistic gravity experiments with precision laser ranging over
interplanetary distances.Comment: 14 pages, 2 figures, 1 table. To appear in the proceedings of the
International Workshop "From Quantum to Cosmos: Fundamental Physics Research
in Space", 21-24 May 2006, Warrenton, Virginia, USA
http://physics.jpl.nasa.gov/quantum-to-cosmos
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