19,345 research outputs found
Plasma charging testing of communication satellites
A discussion is given of ESD as a radiated electromagnetic environment and compares the ESD environment to a standard EMI test environment. An arc generator used to assess the sensitivity of typical spacecraft electronics is described. The results of radiated susceptibility tests conducted on breadboard circuits and a satellite electrical model of a communication satellite are discussed
Strengthening Trade Adjustment Assistance
More than 40 years ago, Congress established the Trade Adjustment Assistance (TAA) program to provide assistance to workers and firms adversely affected by import competition. The program provides extended income maintenance and training to workers and technical assistance to firms. TAA was expanded in the 1970s and cut back during the 1980s. Provisions included in the Trade Act of 2002 breathed new life into the program. Eligibility criteria were extended to include secondary workers and workers who lose their jobs due to offshore shifts in production. A health insurance tax credit and wage insurance were added to the package of assistance for workers. TAA for Farmers and Fishermen was also created. Congress is currently considering further changes to the program, including covering service workers and expanding the health insurance tax credit and wage insurance. Many believe that expanding TAA is critical to winning congressional support for further trade liberalization.
Frequent points for random walks in two dimensions
For a symmetric random walk in which does not necessarily have bounded
jumps we study those points which are visited an unusually large number of
times. We prove the analogue of the Erd\H{o}s-Taylor conjecture and obtain the
asymptotics for the number of visits to the most visited site. We also obtain
the asymptotics for the number of points which are visited very frequently by
time . Among the tools we use are Harnack inequalities and Green's function
estimates for random walks with unbounded jumps; some of these are of
independent interest
A concept for improving the dimensional stability of filamentary composites in one direction
Investigation of filamentary composites having high strength and stiffness and a zero thermal coefficient of expansion in one direction shows that advanced filament materials, such as boron, have substantial advantages over conventional filamentary composites. Various other results are discussed, including guidelines and analysis methods for further evaluation
Testing filamentary composites
NOL ring split-dee tensile test has the advantages that the specimen is readily fabricated by winding and the test is performed in a conventional testing machine without special fixtures. Strain gages cannot be mounted, however, and substantial bending moments are introduced
Design and evaluation of three-phase fibrous composite structures
Study reveals composite combination evaluations for boron binder reinforcements for unidirectly reinforced boron/epoxy, glass binder reinforcements for unidirectionally reinforced boron/epoxy, and glass binder reinforcements for unidrectionally reinforced glass/epoxy
Unidirectional composite stiffening
Simple structural elements are explored with configurations selected to best utilize composite materials. Combination of the biaxial properties of beryllium or an isotropic composite with the uniaxial properties of one directional filamentary reinforcement is studied
Energy and Momentum of a Class of Rotating Gravitational Waves
We calculate energy and momentum for a class of cylindrical rotating
gravitational waves using Einstein and Papapetrou's prescriptions. It is shown
that the results obtained are reduced to the special case of the cylindrical
gravitational waves already available in the literature.Comment: 11 pages, no figure, Late
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