Monitoring the E.D.M. process by radio signals

Experimental studies are described to show that high-frequency radio observations provide a simple way to monitor the E.D.M. process and to distinguish between the effective spark and arc discharges. The paper also describes how radio frequency emitted during machining could be used to optimize the E.D.M. process.

It was found that radiation from the region of the gap between the electrode (tool) and the workpiece are significantly different when the following conditions occur: open voltage, sparking (effective machining), arcing and short circuit. However, a reliable technique was developed to monitor the rate of metal removal and machining efficiency during the E.D.M. process     

Wear and T.E.M. Studies of P.E.C.V.D. Diamond-like-Carbon Films

Diamond-like-carbon (D.L.C.) films are characterized by a low friction coefficient, a high wear resistance and a high corrosion resistance. D.L.C. films can be obtained by P.V.D., C.V.D. and duplex techniques with solid or gaseous precursors. Depending on the processing, hydrogen concentration ranges between 0 and 60%

In this study, hydrogenated D.L.C. has been deposited with a radio frequency system (13.56 MHz) onto a steel substrate. Wear was studied by pin-on-disc testing at room temperature with an alumina counterpart. Interrupted tests were carried out to go into wear mechanisms. Debris were collected after various given sliding times for transmission electron microscopy (T.E.M.) in addition to scanning electron microscopy (S.E.M.) applied to the wear tracks.     

I.D.11

这一期的《I．D．》是创刊50周年的纪念刊，很值得大家收藏哦!一些杂志的纪念刊都是回顾过去或者展望未来，而I．D．选择了关注我们四周正在发生的变化。我们选择的便是《I．D．》所关注的日常生活中的点点滴滴．不经意间．你的生活是不是变得更加与众不同了呢?     

Colloque International RILEM-A.B.E.M.

Sans résumé

---

RILEM-A.B.E.M. International Symposium Brussels, August 30th–September 1st 1967

     

Professor Dennis Gabor,C.B.E., F.R.S., Nobel Laureate

Texture differences in a picture are difficult to analyse by digital techniques, but can be identified readily by optical spatial filtering. However, purely optical processors have several disadvantages. A low-cost system is described in which the output from an optical processor is digitized and processed by a microcomputer to produce a colour-coded image. This makes it possible to use the parallel processing capability of the optical processor for preliminary data reduction, while retaining the flexibility and interactive capability of a digital computer.     

Sumas de productos de v.A.I.I.D

Resumen Obtenemos en este trabajo resultados del tipo ley fuerte, teorema central del límite, ley del logaritmo iterado etc., para la sucesión de variables aleatorias donde {X_k} _k ^x =1 es una sucesión de variables independientes e igualmente distribuidas, analizando previamente su convergencia.