This study is a follow-up of previous work by the authors on the effects of processing variables on the deformation and fracture of 2024-T4 aluminum. In the previous work, four variables were incorporated into a Design of Experiments methodology: solution temperature, solution time, cooling rate and natural aging time. Solution time and cooling rate were found to be the most significant factors...

Nationally, production of broiler eggs chicken continues to increase, however in Aceh Province is still low meet the needs people. This study aimed analyze forecasting egg and demand for chickens as a source animal protein contribution. The was conducted Province, which consists 23 districts/cities. used descriptive quantitative methods narrating series time results obtained from secondary data...

Transient coherent neural oscillations, as indicated by local ¢eld potentials, are thought to underlie key perceptual and cognitive events.We report a transient, state-dependent 50Hz oscillation recorded from electrodes placed in the striatum of awake, behaving rats. These coherent oscillations, which we term g50, occurred in brief (150ms) events co-incident with the initiation of movement. On ...

The objective of this research program is to develop microwave scattering techniques for obtaining quantitative information about the characteristic dimensions of surface cracks in metals. Work carried out during the past year has emphasized experimental techniques. The use of an IF bridge and a nearfield dielectric probe to improve the sensitivity of our 100-GHz eddy-current measurement system...

MARK T. HOLDER1,∗, PAUL O. LEWIS2, AND DAVID L. SWOFFORD3,4 1Department of Ecology and Evolutionary Biology, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045, USA; 2Department of Ecology and Evolutionary Biology, University of Connecticut, 75 North Eagleville Road, Unit 3043, Storrs, CT 06269-3043, USA; 3Institute for Genome Sciences and Policy Center for Evolutionary Genomics, D...

The precipitation and evolution of microstructure in a spray-cast Al-7034 alloy and a commercial wrought Al-2024 alloy were studied after equal-channel angular pressing (ECAP) using transmission electron microscopy and differential scanning calorimetry (DSC). Microstructural examination showed the grain sizes of both alloys were reduced to the range of ~0.3–0.5 μm through ECAP. The DSC analysis...

This paper presents the effects of varying waveguide material and/or shape on the frequency and joint-time-frequency characteristics of pulsed acoustic emission (AE) events. Forty-eight solid cylindrical waveguides were fabricated from alumina ceramic, mild steel, stainless steel (SS316), 2024-T3 aluminium or extruded Delrin. Three different lengths, two diameters and four sensor face angles we...