Dual-tunable hybrid wave ferrite-ferroelectric microwave resonator

A novel electric and magnetic field tunable microwave resonator with a yttrium iron garnet and barium strontium titanate layered structure is investigated. The measured characteristics at 3.6 GHz, corresponding to the proximity of magnetic and dielectric resonance modes, show a broadband electrical tunability. A tuning range of 1.5% of the central resonance frequency is obtained for nominal electric fields.     

Application of the dynamic photoelastic method to the study of stresses in piles

Conclusions 1. The techniques developed and the method of deciphering the experimental data permit investigating various practical dynamic problems by the photoelastic method.2. On the basis of the pile driving problem, we show the practical possibility of modelling an impact, and we obtain all the necessary scales for modelling, which may be utilized for application in other experimental methods.3. The experimentally obtained graphs of dissipation for propagation of an impulse due to impact on a pile, as well as the value of the coefficient of shielding of a Joint, may be utilized in the engineering practice.Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 6, pp. 17–19, December, 1968.     

Student teams and comparison among equals: Effects on academic performance and student attitudes.

Investigated the independent effects of level of reward (recognition based on the performance of a 4- to 5-member cooperative learning team vs recognition based on individual performance) and comparison of student quiz scores (comparison with ability-homogeneous groups vs comparison with entire class) on student achievement and attitudes. Ss were 205 7th graders in 8 intact English classes. The experiment used a 2?×?2 (Reward Level?×?Comparison Group) factorial design, in which Ss studied grammar and punctuation for 10 wks. Results indicate reward level effects in favor of team reward and comparison group effects in favor of the comparison with equals on percentage of time on task, positive interpersonal perceptions, and other variables. No academic achievement effects were found for either factor. (14 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)