The compact steep spectrum (CSS) and gigahertz peaked spectrum (GPS) sources are widely believed to be young radio sources, with ages 106 yr. If the activity in the nucleus is fuelled by the supply of gas, one might find evidence of this gas by studying the structural and polarisation characteristics of CSS sources and their evolution through this gas. In this paper we discuss some of the possi...

Abstract Aiming at the problem of accurate latch opening control expansion wave gun automatic gun, mathematical model time is established, travel curve projectile and wave, velocity are studied, occurrence close to simulated analyzed; The time-space evolution relationship between local sound velocity, gas simulated; average pressure chamber resultant force two launch modes compared analyzed. Af...

The compressive behavior of open-cell aluminum alloy foam and stainless steel woven textile core materials have been investigated at three different deformation rate regimes. Quasi-static compressive tests were performed using a miniature loading frame, intermediate rates were achieved using a stored energy Kolsky bar, and high strain rate tests were performed using a light gas gun. In agreemen...

A gas-gun technique to radially expand cylinders of a chosen material, based on a technique developed in 1979, has recently been re-established. Stainless steel 304 cylinders of length 160 mm, internal diameter 67 mm and thickness either 0.5 or 1.5 mm have been expanded using a 70 mm bore single-stage gas-gun. Microstructural analysis of the recovered specimens was performed using optical micro...

The newer techniques of cementing aim to improve interlock between cement and bone around a femoral stem by combining high pressure and reduced viscosity. This may produce increased embolisation of fat and marrow leading to hypotension, impaired pulmonary gas exchange and death. For this reason the use of high pressures has been questioned. We compared finger-packing with the use of a cement gu...

T e c h n i q u e s have b e e n d e v e l o p e d to l a u n c h u l t r a l i g h t w e i g h t m o d e l s (i. e . , d e n s i t i e s on the o r d e r of 1 l b / f t 3) f r o m a t w o s t a g e l i g h t g a s gun. To date , s p h e r e s and c o n e s have b e e n l a u n c h e d wi th s o m e s u c c e s s . The p u r p o s e of the d e v e l o p m e n t was to d e t e r m i n e w h e t ...