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882 results on '"Wells, John M."'

6. The Development of a Thermally Enhanced Emergency Fire Shelter

Author

Fody, Joshua M, Calomino, Anthony M, Daryabeigi, Kamran, Bruce III, Walter E, Wells, John M, Wusk, Mary E, and Miller, Stephen D

Subjects
Engineering (General)
Abstract

Since its founding in 1905, the U.S. Forest Service has been responsible for maintaining public lands. The Forest Service and other public lands agencies respond to an average of 73,000 wildfires per year, and responding firefighters are required to carry a number of safety gear items, including the M2002 emergency fire shelter. The emergency fire shelter is intended to serve as a last resort means of protection in case a firefighter's escape route has been compromised in the face of an approaching flame front. No fire shelter deployment tragedy has been more costly than the 2013 Yarnell Hill fire in Arizona, where 19 members of the Granite Mountain Hotshots perished. After the tragedy at Yarnell Hill, the Forest Service decided to expedite the next redesign cycle of the fire shelter in order to improve its ability to withstand direct contact with flames. Engineers at NASA Langley Research Center have spent the better part of a decade developing flexible thermal materials for use in inflatable aerodynamic decelerators and have demonstrated their performance in the IRVE-2 and IRVE-3 flight programs (Inflatable Reentry Vehicle Experiment). NASA engineers recognized an opportunity to leverage their experience and knowledge with flexible thermal protection systems to potentially improve the fire shelter's resistance to direct flame contact, and have been working directly with the U.S. Forest Service to achieve this goal. They launched the CHIEFS project (Convective Heating Improvement for Emergency Fire Shelters) in 2014. Over the past three years, CHIEFS has screened over 270 unique material layups, and tested over 30 unique full scale shelter concepts in an effort to achieve a game changing improvement to the thermal protection of the fire shelter, while maintaining minimal mass and volume. This paper will discuss CHIEFS' 1st and 2nd generation fire shelter development efforts and test results.

Published
2017

11. Business cycles, seasonal cycles, and common trends

Author

Wells, John M.

Subjects
Business cycles -- Research, Seasonal variations (Economics) -- Research, Consumption (Economics) -- Research, Business, Economics
Abstract

The effects of real business cycle (RBC) models, which are based on neoclassical growth theories, to long-run economic growth have been studied. The RBC theory proposed that some aggregate economic variables, such as output, consumption, and investment, will eventually share a common stochastic trend despite having individual positive growth. The study showed that RBC cannot determine and adjust seasonal changes of aggregate variables by using unadjusted data and cannot support a common long-run trend of these variables. It also showed that seasonality varies depending upon a country's economic condition.

Published
1997

15. Cellular fatty acid composition of symbiotic cyanobacteria isolated from the aquatic fern Azolla

Author

Caudales, Rodulio, Wells, John M., and Antoine, Alan D.

Subjects
Fatty acids -- Analysis, Cyanobacteria -- Physiological aspects, Biological sciences
Abstract

The fatty acid composition of ten isolates of symbiotic cyanobacteria from Azolla were analyzed and compared to that of the free-living cyanobacteria, Anabaena and Nostoc. There were 16 major and 38 minor components, accounting for 88.31 and 10.30 percent, respectively, of total fatty acids. The most abundant component in the major component group was the 16:0. Five of 19 specific fatty acids were different from only Anabaena, and five from only Nostoc. Thus, the Azolla cyanobionts appeared to be equally distinct from Anabaena and Nostoc.

Published
1992

21. A COMMON-FEATURES ANALYSIS OF AMSTERDAM AND LONDON FINANCIAL MARKETS DURING THE EIGHTEENTH CENTURY

Author

DEMPSTER, GREG, WELLS, JOHN M., and WILLS, DOUGLAS T.

Subjects
London, England -- Economic aspects, Amsterdam, Netherlands -- Economic aspects, Speculation -- History -- Analysis -- Economic aspects -- 18th century AD, Economics -- Analysis -- Economic aspects -- 18th century AD, Business, general, Economics, Economic aspects, Analysis, History
Abstract

DOUGLAS T. WILLS [*] We examine the financial linkage between the London and Amsterdam financial markets using stock prices recorded in each market over the period 1723-94 in conjunction with [...]

Published
2000

24. Seasonality, leading indicators, and alternative business cycle theories

Author

WELLS, JOHN M.

Subjects
United States economic conditions -- Models, Economic indicators -- Models, Business cycles -- Models, Business, Business, general, Economics
Abstract

Rolling regressions and Granger causality tests are used to examine the predictive ability of seasonally adjusted and unadjusted leading economic indicators for the US economy. Many of the unadjusted variables [...]

Published
1999

43. Platelets from patients with Alzheimer's disease or other dementias exhibit disease-specific and apolipoprotein E correlatable defects

Author

Davies, Theresa A., primary, Long, Heidi J., additional, Rathbun, Wayne H., additional, Sgro, Kimberly R., additional, Tibbles, Heather, additional, Smith, Sally J., additional, Seetoo, Kurt F., additional, McMenamin, Mary E., additional, Johnson, Robin, additional, Wells, John M., additional, Levesque, Claire, additional, Fine, Richard E., additional, and Simons, Elizabeth R., additional

Published
1996
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45. Apolipoprotein E genotype in patients with alzheimer's disease: Implications for the risk of dementia among relatives

Author

Farrer, Lindsay A., primary, Adrienne Cupples, L., additional, Van Duijn, Cornelia M., additional, Kurz, Alexander, additional, Zimmer, Reinhilde, additional, Müller, Ulrich, additional, Green, Robert C., additional, Clarke, Valerie, additional, Shoffner, John, additional, Wallace, Douglas C., additional, Chui, Helena, additional, Flanagan, Steven D., additional, Duara, Ranjan, additional, George-Hyslop, Peter St., additional, Auerbach, Sanford A., additional, Volicer, Ladislav, additional, Wells, John M., additional, Van Broeckhoven, Christine, additional, Growdon, John H., additional, and Haines, Jonathan L., additional

Published
1995
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