Design technique for low-current generators

The interconnection of a complementary rail-supply-insensitive PTAT current source and a lightly saturated transistor facilitates the design of a low-current source of predictable strength using a monolithic bipolar technology. The technique can deliver an output current of a few microamperes with a total circuit resistance of 1 k?.     

Subcortical-type dysfunction in a case of AIDS-related Complex (ARC).

Examined the cognitive functioning of a 27-yr-old bisexual Black male with ARC manifested as acquired immune deficiency syndrome (AIDS) dementia, using a memory scanning procedure. Although the S demonstrated normal memory scanning accuracy, psychomotor slowing and impaired information processing were revealed by a reaction time (RT) task. Findings suggest that an abnormally slow rate of central information processing may be one feature of dementia associated with subcortical pathology in AIDS. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Intellectual performance in multi-infarct dementia and Alzheimer''s disease a replication study

A comparative study was conducted to evaluate the efficacy of a metal or flexible plastic 8 mm cannula for artificial abortion by vacuum aspiration for patients at six to 10 weeks' gestation. Complication rates, amounts of retained tissue (obtained with a curette check), frequencies of cannula obstructions and procedure times were used as criteria for determining the efficacy of the two types of cannulae. Two physicians participated in the study: one was responsible for the preliminary examination and performance of the abortion, and the other physician, who was kept unaware of the type of cannula used, was responsible for patient care after completions of the abortion to the time of the follow-up visit. Paracervical block anesthesia was used in all cases. Differences in complication rates (controlled for gestational age) between groups of subjects aborted with either the metal or flexible plastic cannula were not significantly different (p less than .05). For both patient groups shock was the most frequently reported immediate complication (2.7% in the metal cannula group, 4,7% in the flexible plastic cannula group), and leukorrhea was the most frequently reported complication at the time of follow-up (3.3% metal, 5.3% flexible plastic). Amounts of retained tissue and frequency of cannulae obstruction were similar for both groups. Procedure times were also similar for both groups (means of 5.7 minutes and 5.5 minutes, respectively, for procedures performed with the metal and flexible plastic cannulae).     

A.C.-coupled probe technique for very-low-frequency operation

The use of a junction-f.e.t. matched pair, functioning as a self-biased source follower, bootstrapped by the operational amplifier voltage follower it drives, facilitates the design of an a.c.-coupled oscilloscope probe with maximised input impedance. Consequently, a lower-cutoff frequency of less than 3 Hz is feasible with input coupling components that are not incompatible with current i.c. design practice.     

Creating informal play opportunities: Are parents' and preschoolers' initiations related to children's competence with peers?

Preschoolers' social competence may depend on the frequency with which informal play activities are initiated by parents, children, and playmates. In this study, measures of children's peer relations in informal and school contexts and the frequency of parents', children's, and peers' play initiations were obtained with 83 preschool children and their families on 2 occasions. Frequent parent initiations were associated with higher levels of prosocial behavior, lower levels of nonsocial behavior, and, among boys, greater peer acceptance in preschool. Children who were more initiating of informal peer contacts displayed less anxious behavior in school and were better liked by their classmates. Finally, the degree to which parents involved children in the process of arranging informal play activities was positively related to the frequency with which children initiated their own peer contacts. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Factor structure of the WISC-R for a clinic-referred population and specific subgroups.

Compared the factor structure of the WISC-R for a clinic-referred population of 594 2nd–6th graders and specific subgroups (emotionally handicapped, learning disabled and slow learner combined, and no significant problem) with that obtained by A. S. Kaufman on the WISC-R (1975) standardization sample. Similar factor-analytic procedures were used, and 3 factors were extracted from each group. The 1st 2 factors, Verbal Comprehension and Perceptual Organization, which were identified on the standardization sample, were consistently in evidence. However, Factor 3 was much less stable, and the conclusion was drawn that there may be some genuine differences between normal and clinical populations on that factor. (3 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Potassium and magnesium responses of cassava grown in Ultisol in southern Nigeria

Results of three consecutive croppings to study the potassium and magnesium responses of two improved cassava cultivars TMS 30395 and 30211 grown on an acid, sandy loam, Ultisol (Typic paleudult) in southern Nigeria is reported. On land newly cleared from Eupatorium fallow a significant potassium response in the first cropping year was observed only with the more vigorous cultivar TMS 30395. Both cultivars responded to potassium applications at rates of 30 and 60 kg Kha^–1 in second and third croppings respectively. A significant response to application of 20 kg Mgha^–1 was observed in the third crop with cultivar TMS 30211. Cultivar TMS 30395 seems to be more effective in utilizing magnesium from the soil. Potassium and magnesium responses on this Ultisol can be expected when the IN Ammonium Acetate extractable soil K and Mg test levels are 0.15 me K 100g^–1 and 0.20 meMg 100g^–1, respectively. Critical tissue concentrations of cassava index leaves sampled at 6 MAP are 0.1% K for both cultivars and 0.33% Mg for cultivar TMS 30211.     

The Ocean Color Experiment (OCE) on the Second Orbital Flight Test of the Space Shuttle (OSTA-I)

The Ocean Color Experiment was one of the six remote-sensing experiments which for the first time were launched and success fully operated on board of the second flight of the Space Shuttle during November 1981. The experiment consists of a multispectral image scanner dedicated to the measurement of water color and its interpretation in terms of major water constituents and circulation patterns. The objectives of the experiment, the test site selection, and associated activities are described. The actual mission and results of an initial data analysis is discussed.