26,294 research outputs found
Laser microprobe facility used in the elemental analysis of small feature of a sample
Laser microprobe facility is effective in the elemental analysis of small areas of heterogeneous samples. The instrument uses the focused beam of a pulsed laser to evaporate a small volume of material from a relatively massive sample
Coercive force of thin magnetic films
Phenomenological model aids in understanding the mechanisms responsible for the easy-axis coercive force in thin magnetic films of NiFe, MnBi, and gadolinium iron garnet
Symbolic algorithms for the Painlevé test, special solutions, and recursion operators for nonlinear PDEs
This paper discusses the algorithms and implementations of three MATHEMATICA packages for the study of integrability and the computation of closed-form solutions of nonlinear polynomial PDEs. The first package, PainleveTest.m, symbolically performs the Painlevé integrability test. The second package, PDESpecialSolutions.m, computes exact solutions expressible in hyperbolic or elliptic functions. The third package, PDERecursionOperator.m, generates and tests recursion operators
Transferring saturation, the finite cover property, and stability
Saturation is (mu,kappa)-transferable in T if and only if there is an
expansion T_1 of T with |T_1| = |T| such that if M is a mu-saturated model of
T_1 and |M| \geq kappa then the reduct M|L(T) is kappa-saturated. We
characterize theories which are superstable without the finite cover property
(f.c.p.), or without f.c.p. as, respectively those where saturation is
(aleph_0,lambda)-transferable or (kappa(T),lambda)-transferable for all lambda.
Further if for some mu \geq |T|, 2^mu > mu^+, stability is equivalent to: or
all mu \geq |T|, saturation is (\mu,2^mu)-transferable.Comment: This version replaces the 1995 submission: Characterization of the
finite cover property and stability. This version submitted by John T.
Baldwin. The paper has been accepted for the Journal of Symbolic Logi
Development of large, horizontal-axis wind turbines
A program to develop large, horizontal-axis wind turbines is discussed. The program is directed toward developing the technology for safe, reliable, environmentally acceptable large wind turbines that can generate a significant amount of electricity at costs competitive with those of conventional electricity-generating systems. In addition, these large wind turbines must be fully compatible with electric utility operations and interface requirements. Several ongoing projects in large-wind-turbine development are directed toward meeting the technology requirements for utility applications. The machines based on first-generation technology (Mod-OA and Mod-1) successfully completed their planned periods of experimental operation in June, 1982. The second-generation machines (Mod-2) are in operation at selected utility sites. A third-generation machine (Mod-5) is under contract. Erection and initial operation of the Mod-5 in Hawaii should take place in 1986. Each successive generation of technology increased reliability and energy capture while reducing the cost of electricity. These advances are being made by gaining a better understanding of the system-design drivers, improving the analytical design tools, verifying design methods with operating field data, and incorporating new technology and innovative designs. Information is given on the results from the first- and second-generation machines (Mod-OA, - 1, and -2), the status of the Department of Interior, and the status of the third-generation wind turbine (Mod-5)
FDG-PET/CT Imaging for Mediastinal Staging in Patients With Potentially Resectable Non-Small Cell Lung Cancer
Diffraction-limited CCD imaging with faint reference stars
By selecting short exposure images taken using a CCD with negligible readout
noise we obtained essentially diffraction-limited 810 nm images of faint
objects using nearby reference stars brighter than I=16 at a 2.56 m telescope.
The FWHM of the isoplanatic patch for the technique is found to be 50
arcseconds, providing ~20% sky coverage around suitable reference stars.Comment: 4 page letter accepted for publication in Astronomy and Astrophysic
Recent U.S. Trade Policy and its Global Implications
The purpose of this paper is to describe United States trade policy since World War II, and to assess the possibility for ongoing U.S.trade-policy leadership. U.S. trade policy has shown remarkable consistency since World War II. It has never been as purely free-trade-focussed as some commentators suggest, but it has not recently shifted toward isolationism as dramatically as alarmists fear. It has almost always been best described as "open, but fair," with injury to import competitors being the measure of "fairness." The general consistency of U.S. trade policy over time is quite remarkable given the frequent change of political party in power, especially in the executive branch, but also in the Congress. U.S. trade-policy leadership seems still potentially strong despite a decline in U.S. hegemony. It is clearly strong in a protectionist direction.Any shift toward aggressive insularity justifies parallel trade-policy aggression in the eyes of trading partners. It is arguably strong ina liberalizing direction as well. The U.S. seems ideally poised for aggressive trade-policy peacemaking; perhaps multilaterally, but perhaps also bilaterally; perhaps with its traditional industrial trading partners, but perhaps also with Japan and newly industrializing Asian countries that play so importanta role in U.S. trade, and that, on many matters,may be closer in spirit to U.S. economic philosophy than Europe, Canada, or Latin America.
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