Foster-Miller's development of dry coal feed systems

Dry coal feeder systems developed for pressurized conversion processes were carried through a laboratory scale development program. These concepts include: (1) a centrifugal solids feeder; (2) a fluidized piston feeder; (3) a linear pocket feeder; and (4) a compacted coal plug feeder. Results of laboratory model testing of all concepts are reviewed

The Sequential Relationship of Body Oscillations in the Paper Wasp, \u3ci\u3ePolistes Fuscatus\u3c/i\u3e (Hymenoptera: Vespidae)

Three kinds of body oscillations by foundresses of the paper wasp, Polistes fuscatus, were analyzed from 100 h of videotapes of 17 multiple- and 16 single-foundress, preworker colonies. The three kinds of oscillations were observed to be temporally proximate only after prey returns. Their sequential occurrence was always antennal drumming (AD), abdominal wagging (AW), and lateral vibration (LV). This sequence is consistent with the hypothesized communicative meanings of ADs, AWs, and LVs. In particular, ADs may signal larvae to withold salivary secretions prior to receiving a liquid meal from an adult female; oscillations AW and LV may signal larvae to secrete and withold saliva, respectively, Additional studies are required to provide causal evidence of the communicative meanings of ADs, AWs, and LVs

MEASURING CHILDREN’S TIME USE: A REVIEW OF METHODOLOGIES AND FINDINGS

For those interested in child wellbeing, time use can provide an unusually objective measure of exactly what youth are doing. Before we can evaluate how well children are doing and why some are doing better than others, it is important to understand what they are doing, with whom, and in which social contexts and institutions. The report is intended to serve as a basic starting point for those interested in pursuing research in children and adolescents’ time use. It presents an overview of recent research on how American youth use time, focusing on methodological issues in measuring their time use and highlighting substantive findings from the literature. The procedures, advantages, and disadvantages of the three primary methods of measuring children’s time use, along with general issues which are relevant to all three methods, are discussed. Findings include general results about how youth divide their time between life’s domains such as work, maintenance, and leisure, relationships between time use and outcomes, and how youth differ in time use by race, class, gender, and age, with special attention paid to the area which has inspired the most time-use research, girls’ and boys’ household work.

Cohort profile: the DASH (determinants of adolescent social well-being and health) study, an ethnically diverse cohort

No abstract available