Home work in the elementary school: a study in two communities

Thesis (Ed.M.)--Boston Universit

High temperature refractory member with radiation emissive overcoat

A radiation type heat dissipator for use in a plasma engine is formed of a refractory metal layer upon which there is deposited a radiation emissive coating made of a high emissivity material such as zirconium diboride. The radiation emissive coating has a surface emissivity coefficient substantially greater than the emissivity coefficient of the refractory metal and thereby enhances the optical radiating efficiency of the heat dissipator

Double swivel toggle release

A pyrotechnic actuated structural release device is disclosed which is mechanically two fault tolerant for release. The device comprises a fastener plate and fastener body each attachable to one of a pair of structures to be joined. The fastener plate and the fastener body are fastened by a dual swivel toggle member. The toggle member is supported at one end on the fastener plate and mounted for universal pivotal movement thereon. Its other end is received in a central opening in the fastener body, and has a universally mounted retainer ring member. The toggle member is restrained by three retractable latching pins symmetrically disposed in equiangular spacing about the axis of the toggle member and positionable in latching engagement with the retainer ring member on the toggle member. Each pin is retractable by a pyrotechnic charge, the expanding gases of which are applied to a pressure receiving face on the latch pins to effect retraction from the ring member. While retraction of all three pins releases the ring member, the fastener is mechanically two fault tolerant since the failure of any single one or pair of the latch pins to retract results in an asymmetrical loading on the ring member and its dual pivotal movement ensures a release

Limits on interest rate rules in the IS model

Interest rates

Profits and balance sheet developments at U.S. commercial banks in 2007

Reviews recent developments in the balance sheets and in the profitability of U.S. commercial banks. The article discusses how developments in the U.S. banking industry in 2007 and early 2008 were related to changes in financial markets and in the broader economy.Banks and banking - United States ; Bank profits

Comments on “Electric current and electric field induced in a human body when exposed to an incident electric field near the resonant frequency”

[For original paper see R. W. P. King, IEEE Trans. Microwave Theory Tech., vol. 48, no. 9, pp. 147-53 (2000).] The author makes two observations on the original article. The commentator questions whether a seated person is well modeled as a right circular cylinder. The second observation is that King cites only microwave studies on mice to show that electromagnetic radiation causes malignancies. These studies themselves are widely disputed. He then uses simple dimensional scaling to show that 2.45 GHz for a mouse scales to 100 MHz for a man. Such a scaling law may be useful in calculating the resonant frequency for a human subject versus a mouse when treated as antennas, but such scaling is meaningless when the physics of a hypothetical carcinogenic process are unknown

Summary Jurisdiction in Bankruptcy: Katchen v. Landy and Questions Left Unanswered

This article deals with a complex and conceptually difficult phase of bankruptcy law. It is not written for the beginner, for it does not contain all the background material necessary to effectuate a full understanding of the area. But it is extremely objective, and it exhaustively treats the relevant appellate court decisions. For the informed reader, therefore, it is both thought-provoking and an invaluable research tool

New techniques for the evaluation and design of optical systems

Imperial Users onl