Electronic phase-locked-loop speed control system is stable

Phase locked-loop circuit is used for playback motors in digital tape recorders where the reproducer output remains in exact synchronism with an external reference clock over extended periods. It removes the motor dynamics from the control loop so that the loop is stable without damping

Reports on a Course for Prospective High School Mathematics Teachers

The author describes his design for a course entitled Secondary School Mathematics from an Advanced Viewpoint. He adds subjective comments on how his design has worked in practice

Parental Conversation Styles and Learning Science With Preschoolers

Preschool children participated in a science-learning event about light in their own classroom. The same day as the event, parents or caregivers were instructed to converse with their children at home in the evening about either the science learning event or another ‘special or fun’ event that happened to them recently in whatever way was natural for them. One week later, a researcher interviewed children to examine what they remembered about the science-learning event. Analyses focused on the impact of the topic and degree of elaboration of parent-child conversations on children’s memory for the science-learning event a week later. The findings have implications for best practices in preschool education

Totally Class-Less?: Examining Bristol-Myer\u27s Applicability to Class Actions

In June 2017, the U.S. Supreme Court tightened the specific jurisdiction doctrine when it dismissed several plaintiffs’ claims in a mass tort action against pharmaceutical company Bristol-Myers Squibb (BMS) for lack of personal jurisdiction. The action was brought in a California state court and involved several hundred plaintiffs alleging that they were injured by Plavix, a drug BMS manufactures. The Supreme Court held that California could not constitutionally exercise personal jurisdiction over BMS as to the nonresident plaintiffs, who did not have an independent connection to California. While the nonresident plaintiffs argued that California had specific jurisdiction because their claims were identical to the California residents’ claims (with the only difference being that their experience with Plavix occurred in other states), the Court held that these claims did not arise out of BMS’s contacts with California, but rather out of BMS’s contacts with the particular states in which these plaintiffs were injured. In so holding, the Court emphasized that enabling California to exercise jurisdiction in this context would infringe on the sovereignty of other states—more specifically, the states who housed the nonresident plaintiffs involved in the action. This Note explores whether class actions should be bound by this decision. The fundamental question, then, is whether class actions are meaningfully distinguishable from mass tort actions such that they avoid Bristol-Myers’s reach

Burdens and Restrictions of Workplace Regulations on Small Business: Statement of the U.S. Chamber of Commerce Before the Commission on the Future of Worker-Management Relations

Testimony_Stone_121593.pdf: 276 downloads, before Oct. 1, 2020

Synchronous servo loop control system Patent

Design and development of synchronous servo loop control syste

An assessment of nitrogen fixation in 'organically managed' spring-sown lupins and leaching under a following winter cereal

Three spring-sown species of lupins (Bora, Prima and Wodjil) and peas were compared in terms of N fixation and subsequent leaching under a following winter cereal crop. Although peas out-yielded lupins (5.4 t compared with ca 3.5 t grain, respectively), the yellow lupin (Wodjil) fixed more N than peas (180 compared with 120 kg N ha-1) and all three lupins contained more protein (> 30%) than the peas (22%). Wodjil was the most effective at suppressing weeds, carrying only 12% of the weed burden found in fallow plots, followed by peas (19%). Winter leaching amounted to > 50 kg nitrate-N ha-1 from under the winter cereal, regardless of whether the previous treatment was a legume crop or was left fallow. There were no significant differences in leaching between the three species of lupin. Leachate in the first 350 mm of drainage under the winter cereal exceeded the EU limit on nitrate in drinking water in all treatments. This work is part of a wider collaborative study supported by Defra which covers a range of UK sites

Rapid design of LCC current-output resonant converters with reduced electrical stresses

The paper presents and validates a straightforward design methodology for realising LCC current-output resonant converters, with the aim of reducing tank currents, and hence, electrical stresses on resonant components. The scheme is ideally suited for inclusion in a rapid iterative design environment e.g. part of a graphical user interfac