review of recent developments in joining high-performance thermoplastic composites

there is currently a great deal of interest in the use of thermoplastic polymers as matrices in fiber reinforced composites for high performance applications, such as those encountered in the aerospace industry. these materials include polyether ether ketone (peek), polyphenylene sulphide (pps), polyetherimide (pei), polyamideimide (pai),..

proteccion de acero al carbono en plantas g.s. (girlder sulfide) formacion de la capa protectora de sulfuros de hierro sobre superficies cubiertas de cascarilla de fabricacion. pte. 4. (carbon steel protection in g.s. (girlder sulfide) plants. iron sulfid

this work describes the assays aimed to passivate the steel carbon of the process pipings. this steel is marked by the astm a 333 g6 and is chemically similar to those of isotopic exchange towers which corrode in contact with in-water hydrogen sulfide solutions forming iron sulfide protective layers. the differences between both materials..

q-degradation in high purity niobium cavities: dependence on temperature and rrr-value

the observation in 1989 that the q-value of superconducting cavities fabricated from high purity niobium could significantly degrade when these cavities were kept for longer periods of time at temperatures between 50k and 200k became a major concern for accelerator projects employing superconducting cavities. a large number of investigati..

evaluation of the factors involved in bioaccumulation of gamma-emmitting radionuclides in white-tailed deer (odocoileus virginanus). final report

the objectives of the work were to: determine the amounts and kinds of fallout gamma emitting radionuclides in an important food and sport animal, the white-tailed deer (odocoileus virginianus) in the southeastern u.s.a.; elucidate some of the food chain interrelationships around the year; and see if a relationship exists between bioaccum..

new look at odorization levels for propane gas

nearly 4,000 persons participated in a study to evaluate three odorant systems in four test modes and at 24 different test sites participants included trained panels, untrained erda employees, and several thousand untrained volunteer evaluators. the classical testing technique and three modified test modes were used to represent a spectru..

evaluation of potable water as a vehicle of transmissibility and viability for herpesvirus

the primary obstacles in evaluation of water contamination with viruses are to maintain the virus survival during transportation and to concentrate the viruses sufficiently to demonstrate their presence in water under laboratory conditions. this was achieved by utilizing an ap-25 fiberglass prefilter over an ha-47 mm - 0.4 micron pore fil..

source assessment: mechanical harvesting of cotton - state of the art

the report summarizes reported data on air emissions from the mechanical harvesting of cotton, including the machine removal and collection of seed cotton from mature plants and the transport of this cotton from the field. machine harvesting and field transport cause air pollution in the form of respirable dust, from soil and raw cotton, ..

the economic impact of selected nitrogen restrictions on agriculture in illinois and 20 other regions of the united states

recent concern over environmental quality has raised some serious questions about agriculture's contribution to a deterioration in the quality of our surface and ground waters. the suspicion that there is a relationship between increased nitrate concentrations in streams and the use of nitrogen fertilizer in crop production has led to man..

sst technology follow-on program - phase ii. development and evaluation of the aluminum-brazed titanium system. volume vi corrosion resistance

previous work on the sst prototype and phase i dot/sst follow-on programs showed that the environmental corrosion resistance of aluminum-brazed titanium honeycomb sandwich was basically satisfactory. investigations were conducted in the phase ii follow-on program to explore corrosion resistance of aluminum-brazed titanium over a wider ran..

earnings losses of workers displaced from manufacturing industries

a particularly sensitive current policy issue is the effect of changes in tariffs and quotas on employment and earnings. this study examines empirically some of the effects of a permanent labor displacement which might result from changes in international trade policy. specifically, it presents estimates of how job displacement would chan..