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We report the identification of the optical counterpart of the X-ray transient XTE J1550-564 described in two companion papers by Sobczak et al. (1999) and Remillard et al. (1999). We find that the optical source brightened by ≈ 4 magnitudes over the quiescent counterpart seen at B ≈ 22 on a SERC survey plate, and then decayed by ≈ 1.5 magnitudes over the 7 week long observation period. There w...

Evolution of plate-like precipitate of the W phase in an Al-1.9Cu-0.3Mg-0.2Ag (at.%) alloy has been investigated by three dimensional atom probe (3DAP) and transmission electron microscope (TEM) techniques. In an as-quenched alloy, all solute atoms are uniformly dissolved. After 5 s aging at 180¡C, coclusters of Ag and Mg atoms are present. Initially, these co-clusters do not have well defined ...

We present a simulation study of an important rigid body contact problem. The system in question is composed of a rigid plate and a single rigid body (or particle). The plate follows a prescribed periodic motion of small amplitude and high frequency, such that the net force applied to the part appears to be from a time-independent, position-dependent velocity field in the plane of the plate. Th...

An electromagnetic pulse (EMP) explodes in real-time and causes critical damage within a short period to not only electric devices, but also to national infrastructures. In terms of EMP shielding rooms, metal plate has been used due to its excellent shielding effectiveness (SE). However, it has difficulties in manufacturing, as the fabrication of welded parts of metal plates and the cost of con...

Blocks of acid sulfate altered rock ejected from Halema`uma`u crater in the March 2008 eruption provide evidence of deeper processes that are driving the shallow hydrothermal alteration in this area. Previous work shows that the surficial alteration is dominated by remnant opal (SiO2) and anatase (TiO2), which are compositionally similar to materials found at Home Plate on Mars. The opal deposi...

In order to achieve a high-quality joining of aluminum (Al) and copper (Cu) dissimilar metals, new friction stir double-riveting welding (FSDRW) with Cu rod as the rivet was proposed, rotating tool large concave angle shoulder specially designed. The results showed that under thermal–mechanical effect tool, deformed be double riveting heads structure anchor at upper surface Al plate an above la...