Thermomechanical effects in high-speed seal rubs

The analytical effort was aimed at development of numerical model of thermal and mechanical phenomena which occur during seal rub. Finite element programs were develped for studying the temperatures that result from frictional heating during rubs, and the plastic deformation which is caused by rub forces. The experiment phase was originally intended to aid in verification of the results of the analytical model. Experimental techniques were developed for measuring surface temperatures and deformations during single pass rubs. Modifications were made to the device to permit testing at both high and cryogenic temperatures. The results from the experiments are discussed

Structuring Services and Facilities for Library Instruction

published or submitted for publicatio

A Culture of Mismanagement: Environmental Protection and Enforcement at the New York City Department of Environmental Protection

In April of 1997, far-reaching regulations aimed at the protection of New York City\u27s (City\u27s) drinking water supply went into effect. The Watershed Agreement was reached after more than two years of delicate negotiations by the City, the Coalition of Watershed Towns, the State of New York, the Environmental Protection Agency and a handful of environmental groups. Under this celebrated compromise, the City will spend $1.2 billion to protect its water supply at its source, rather than construct a physically massive and extraordinarily expensive filtration plant that would be required by the federal government under the Safe Drinking Water Act. If the Watershed Agreement is to succeed, however, the New York City Department of Environmental Protection (DEP)-the City agency charged with the duty to implement Watershed protection and enforce the new regulations-must fundamentally reform itself. Presently, Watershed protection is hampered by a toothless enforcement regime with conflicting departmental objectives. This Article examines the institutional culture of mismanagement that plagues the DEP, which jeopardizes the water quality and health of nine million consumers

Arkansas Cotton Variety Test 2012

The primary goal of the Arkansas Cotton Variety Test is to provide unbiased data regarding the agronomic performance of cotton varieties and advanced breeding lines in the major cotton-growing areas of Arkansas. This information helps seed companies establish marketing strategies and assists producers in choosing varieties to plant

Attacking the Weakest Link: The Anti-Support Role of Soviet Naval Forces

Communications and navigation facilities, tenders, missile transport and storage facilities, supply ships, fixed acoustic arrays, cargo handling facilities, and the like are more susceptible to destruction than the weapons systems to whose support they are dedicated

The Evolution of Soviet Thought on Warfare in the Fourth Dimension

A number of authors lately have expressed proper concern about thereadiness of the US Navy to conduct warfare in a dimension other than the three conventional media: sea, air, and land.\u27 This additional dimension, the electromagnetic spectrum, is as vital a battlefield in wartime as any of the other three, perhaps even more so. While Americans have consistently been in the forefront of the technical development of electronic warfare (EW) equipment, we have not, at the same time, been quick to exploit its operational utility across the entire spectrum of warfare

A thermal, thermoelastic, and wear analysis of high-energy disk brakes

A thermomechanical investigation of the sliding contact problem encountered in high-energy disk brakes is described. The analysis includes a modelling, using the finite element method of the thermoelastic instabilities that cause transient changes in contact area to occur on the friction surface. In order to include the effect of wear at the contact surface, a wear criterion is proposed that results in the prediction of wear rates for disk brakes that are quite close to experimentally determined wear rates. The thermal analysis shows that the transient temperature distribution in a disk brake assembly can be determined more accurately by use of this thermomechanical analysis than by a more conventional analysis that assumes constant contact conditions. It also shows that lower, more desirable, temperatures in disk brakes can be attained by increasing the volume, the thermal conductivity, and, especially, the heat capacity of the brake components