We present a proper motion study of the shock waves within the classic stellar jet HH 47 based on Hubble Space Telescope Hα and [S II] images of the region taken over two epochs. Individual knots within the jet and in the bow shock/Mach disk working surface of HH 47A move significantly in the five years that separate the images, and the excellent spatial resolution of HST makes it possible to m...

We study the effects of jet-like explosion in SN 1987A. Calculations of the explosive nucleosynthesis and the matter mixing in a jet-like explosion are performed and their results are compared with the observations of SN 1987A. It is shown that the jet-like explosion model is favored because the radioactive nuclei Ti is produced in a sufficient amount to explain the observed bolometric luminosi...

We present VLBI and MERLIN data at 1.66 and 4.99 GHz on the central component coincident with the nucleus of the giant radio galaxy, 3C236. The nuclear radio structure is composed of two complexes of emission which are resolved on scales from 1 milli-arcsec (mas) to 1 arcsec. Oscillations with an amplitude of ∼ 5 • can be seen in the compact radio structure. Spectral index distributions are plo...

Three-dimensional numerical simulations of freely evolving stratified geostrophic turbulence on the plane are presented as a simplified model of zonal jet formation on Jupiter. This study samples the parameter space that covers the low, middle, and high latitudes of Jupiter by varying the central latitude of the plane. The results show that robust zonal jets can emerge from initial small-scale ...

The present study proposes novel micro-jet impingement heat sink with effusion holes for flow extraction. The design consists of impingement nozzles surrounded by multiple effusion holes to take away the spent fluid. A three-dimensional numerical model is used for steady, incompressible, laminar flow and conjugate heat transfer for the performance analysis of the proposed design. The computatio...

Atmospheric pressure microplasma jet sources driven by radio-frequency wave of 13.56MHz and by low frequency continuous wave of several kHz ac were fabricated and characterized. The source consists of an ac-driven copper wire (needle) surrounded by dielectric layer that are placed in a glass tube, and a ground plane electrode (pin-to-plane electrode configuration). The basic physical and chemic...

Problem statement: Single Point Diamond Turning (SPDT) is highly deterministic and versatile in producing various forms of precise optics. A typical example is the production of large offaxis aspheric mirrors and various infrared mirrors and mandrels. However, the fine periodical turning marks left in the surface critically limit its performance and they are difficult to be avoided for traditio...