Showing papers on "Heap (data structure) published in 1971"

On exponents of primitive matrices

Abstract: A theorem of Heap and Lynn is slightly strengthened and a number of new sharp bounds and some old ones for exponents of certain special cases of primitive matrices are presented. A new characterisation of primitive matrices in introduced.

Method and a device for mixing and homogenizing of bulk material

Abstract: In a method and means for mixing and homogenizing bulk material such as lump ore and ore concentrates, in which a mixing heap is formed by dumping the material as a large number of layers one on top of the other, said mixing heap thereupon being dug off over the entire height, in which for forming said mixing heap the material to be dumped in layers is fed by a digging machine onto a belt conveyor system and is dumped from this system by a longitudinally moving dumping machine onto the said mixing heap, the material during transport to the dumping machine passes through a throughflow hopper, from which it is discharged in a constant flow, and the speed of the digging machine is controlled in dependency upon the filling of this hopper by special mechanisms, preferably comprising a metering device below the hopper, weight signalling means, weight-to-volume converting means, and special supports and controls.

Scour pad and method of making the scour pad

Abstract: A method of making a scour pad from a length of tubular plastic fabric netting characterized by the wrinkling or the rucking of said fabric into a heap, folding a portion of said fabric back over and enveloping said rucked heap, and maintaining the resulting spherical-like heap or bun shape by means of two incorporated rubber bands; and the provision of a specific stepped mandrel means for practising said method.

Comments on Heap, Boblitt, Moore, and Hord's “Behavior-Milieu Therapy with Chronic Neuropsychiatric Patients”

Abstract: A recent study by Heap, Boblitt, Moore, and Hord (1970), comparing the combined effects of token economy, milieu, and attitude therapies with a no-treatment chronic ward control group, is criticized because of several methodological deficiencies: confounding of several treatment modalities, incomparable living arrangements for experimentals and controls, and the absence of an “attention-placebo” control group. An alternative experimental design is offered and suggestions for further research employing token economic methods are outlined.

Random Heap Structure of Molten Salts

Abstract: BERNAL1 has proposed that the geometrical structure of simple monatomic liquids is similar to that of a random heap of hard spheres. From studies of random heaps of ball bearings, Bernal has shown that the maximum volume packing density, ρ, of “random close-packed” heaps of equal spheres is 0.637. (ρ is 0.741 for crystalline close-packing.)