Mechem

The derivation becomes much more difficult and is beyond the scope of this chapter. The reader is referred to specific references on sintering and sintering mechemisms. 

Mechem Division of Denel, South Africa (retired)... 

The old Mechem was part of that GICHD MDD effort and I pushed our MEDDS with a passion. It was only accepted once the South African government... 

MECHEM, a division of DENEL (Pty) Ltd (South Africa), was established in the late 1960s, originally as a research unit of the Council for Scientific and Industrial Research (CSIR) in South Africa, culminating into a division of DENEL (South Africa). 

A NVESD12 contract over the past two years with the new Mechem and Nomadics attempted to repeat more scientifically what the original development and demining contracts had taught us about the system. They had some success. 

Mechem s own internal QA, however, found the MEDDS system missing mines. Then we would go back and look for the errors. Inevitably the misses would be on clean soil, mostly dry or when the sun was baking down. In all cases a retest on vegetation in the vicinity of the missed mine would indicate the explosive as positive, while a retest above the soil above the mine would still be negative. 

What is important is to note that when the water dried up the spread of TNT remained in that shape. This would explain the so-called camouflage patterns we had determined ten years before. The scientific tests and results obtained in the early 1990s by the old Mechem were never published and only recorded in broad detail. What was shared was the results and developed techniques. 

Editor When you say the old Mechem, do you mean while it was part of CSIR ... 

Not all companies using MDD on squares work the same as Mechem, to let the dog only identify the positive section and then let a manual deminer use a handheld detector and search the whole 10-meter by 10-meter positive section to find and position the mine. Some other companies try and rely on the dog indicating the mine within a 1-meter distance and then let the man just open the mine... 

VJ The key to the Mechem mine clearance operations have been the use of these vehicles because they can carry detectors through mined areas safely without exposing the operator. Why I liked rats is because the REST system using them could be built into a MRV like a Buffalo or Casspir using a team of rats on board. The new Fido can now also do this. 

Decades of demining experience in Africa (see MECHEM), personal recollections on mine hunting. 

Theo van Dyk and some of MECHEM s mine clearers spent a weekend out at a resort near Pretoria where the animal warden made a statement that elephants can smell mines and avoid unmarked minefields in the wild. Not only that, he said they teach other members of the herd the smell and then all of them will avoid wandering into the danger. 

Mechem Explosive and Drug Detection System Microelectrical and mechanical systems Molecularly imprinted polymer Massachusetts Institute of Technology Mine removal vehicle Mass spectrometer... 

Kennedy, A.R., and Little, J.B. (1980). Investigations of the mechemisms for enhancement of radiation transformation in vitro by 12-0-tetradecanoy-lphorobo-13-acetate, Carcinogenesis 1,1039. 

A vEiriety of other tissues synthesize RBP this provides a mechemism for return to the liver of retinol in excess of requirements that has heen teiken up from chylomicrons by the action of lipoprotein Upeise. Because these tissues do not synthesize hansthyi etin, the binding of holo-RBP to tremsthyretin must occur in the circulation after release. 

The biochemiced basis of this resistemce to malMia in riboflavin deficiency is not known, but a number of mechemisms have been proposed, including the following ... 

Under normal conditions, there is little or no urinary excretion of either nicotineimide or nicotinic acid, because botb vitamers are actively reabsorbed from tbe glomerular filtrate. It is only when the concentration is so high that the transport mechemism is saturated that there is any significemt excretion. 

The mechemism of this drug-induced folic acid deficiency is not cleeir, ed-though a number of effects have been reported ... 

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