Comparative implementations of the LMS algorithm

A study of available hardware algorithms was made in order to design adaptive signal processors with VLSI. A suitable model invoking synchrony, topology, and granularity has been chosen to investigate design figures-of-merit for each implementation. At present, redundant arithmetic is being contrasted, basically because carry-free operations are possible resulting in a speed up. This paper focuses on models and primitive computational elements for the least-mean-square (LMS) algorithm embedded in conventional twos complement, bit-serial or distributed arithmetic, and redundant arithmetic processors.     

Effect of heater diameter on the critical heat flux from horizontal cylinders in pool boiling

The characteristic variation of critical heat flux (CHF) with heater diameter in the pool-boiling of horizontal cylinders is discussed. Critical heat flux expressions have been obtained based on hydrodynamic considerations for saturated pool-boiling of cylinders and are compared with existing and new data. Experimental studies are reported which verify the postulated mechanics of the boiling process at CHF over a range of cylinder diameters.     

Preventing escalation in problem behaviors with high-risk young adolescents: Immediate and 1-year outcomes.

Studied alternative intervention strategies to reduce escalation in problem behaviors among 158 familes with high-risk (male and female) young adolescents (aged 11–14 yrs). 119 families were randomly assigned to either a parent focus, teen focus, parent and teen focus, self-directed change (materials only) intervention condition. 39 families were recruited as a quasi-experimental control. Parent focus and teen focus interventions resulted in immediate beneficial effects in observed and reported family conflict. Parent intervention conditions showed immediate beneficial effects on behavior problems at school. Longitudinal trends suggest that the parent focus condition may reduce subsequent tobacco use, compared with all other approaches. Interventions that aggregated high-risk youths into groups, however, showed the highest escalations in tobacco use and problem behavior at school, beginning at termination and persisting to follow-up. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Liquid phase epitaxial growth of InAsxSbyPl-x-y layers on InAs

High quality InAs_xSb_yP_l-x-y quaternary layers, which are lattice matched to InAs, have been grown successfully on InAs substrates by liquid phase epitaxy. Both Graded and constant composition InAs_xSb_yP_l-x-y layers have been grown. In addition, the graded InAs_xSb_yP_l-x-y layer has been used as a buffer layer for the growth of InAs_l-xSb_x on an InAs substrate. Research supported in part by Commander, U. S. Army Missile Command, Attn: AMSMI-RNS, Redstone Arsenal, AL 35809 and ARPA-Advanced Research Projects Agency, 1400 Wilson Boulevard, Arlington, VA 22209.     

Fatigue of viscoelastic polymers: 1. Crack-growth characteristics

Fatigue crack propagation studies conducted in reversed loading have revealed similar behaviour to that obtained in tensile-only cyclic loading. With low-density polyethylene a two-stage growth characteristic is obtained and the improvement in fatigue life-time that is produced by the introduction of a compressive component into the loading cycle appears to be associated with a shift in the stage I–stage II transition to coincide with a different point in the crack development. Tests conducted at different temperatures within the range 261–308K show the same general behaviour, but the stage I–stage II transition is temperature sensitive. Studies on a second low-density polyethylene, a high-density polyethylene and a plasticized poly(vinyl chloride) have been included for comparison and it is shown that significant differences exist in the fatigue behaviour of different polymers as well as much common ground.     

Effect of lysolecithin on gastric mucosal structure and potential difference

Calcium metabolism was studied prospectively in 12 patients with amyotrophic lateral sclerosis. Two patients showed mild hypocalcemia, malabsorption of calcium, and elevated plasma parathyroid hormone concentrations. Serum 25-hydroxyvitamin D was decreased in one and low-normal in the second. These two patients and a third showed aminoaciduria on thin layer chromatography. Calcium metabolism was apparently restored to normal by dihydrotachysterol, a vitamin D analog, but no improvement in neurologic function resulted. Bone radiographs taken in search of metabolic bone disease showed a significant increase in the incidence of congenital vertebral anomalies in the ALS patients (50% versus 8%). The relationship of the abnormalities in calcium metabolism and in vertebral structure to the etiology of motor neuron disease is not known.     

Controlled trial of psychological intervention in myocardial infarction.

Two hospital-based psychological interventions for improving the physical, psychological, and lifestyle status of 32 29–69 yr old patients after myocardial infarction were compared with routine medical and nursing care received by 14 age- and disease-matched controls. The educational intervention consisted of relaxation procedures and information about heart disease and its treatment. The counseling intervention consisted of the educational intervention as well as 6–20 sessions of counseling. 16 Ss were assigned to each intervention. Follow-up at 3, 6, and 12 mo showed that compared with the routine care group, both intervention groups performed significantly better on measures of psychological and lifestyle functioning; they also reported fewer symptoms of heart disease and were not as dependent on treatment. It is concluded that hospital-based psychological intervention has substantial benefits over medical and nursing care alone. It is also suggested that this type of intervention compares more than favorably with routine outpatient cardiac rehabilitation. (24 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

An alternative approach to arrays

This paper presents a new approach to the treatment of arrays in Pascal and Pascal-like languages. The proposed mechanisms allow arrays to be used flexibly in assignments and as parameters to procedures while at the same time preserving the benefits of strong type checking. Several examples to illustrate the mechanisms are presented. Their implementation is also described.