730 research outputs found
Vitra-violet process for producing flame resistant polyamides and products produced thereby
Aromatic polyamides with improved nonflammability characteristics are produced by contacting a polyamide substrate with a gaseous medium comprising a minor amount of a haloolefinic material and an inert diluent in the presence of light having sufficient energy to effect chemical addition of the haloolefin to the polyamide substrate
Flight flutter testing using pulse techniques
A case of flutter developed at a speed lower than had been flown previously. This incident precipitated the routine procedure of pulsing control surfaces as well as the firing of explosive charges during speed build-ups. In the interest of rapid evaluation of results, simple methods of data reduction were used. A case history is presented where in the pulse technique predicted flutter by extrapolating decay rates obtained at subcritical speeds; in addition, a case is presented where no valid extrapolation could be made
Investigation of the reactivity of organic materials in liquid oxygen
Measurements of impact-ignition sensitivity and studies of the relative reactivity of t-butoxy and t-butyl peroxy radicals toward a variety of organic compounds reveal improved methods of selection of materials for safe use in a liquid oxygen environment
Investigation of reactivity of launch vehicle materials with liquid oxygen Quarterly report, 23 Jul. - 22 Oct. 1968
Reactivity of launch vehicle organic materials with liquid oxyge
Investigation of Reactivity of Launch Vehicle Materials with Liquid Oxygen
Impact sensitivity and ignition mechanism of organic compounds in liquid oxygen correlated with chemical and physical propertie
Experimental investigation of elastic mode control on a model of a transport aircraft
A 4.5 percent DC-10 derivative flexible model with active controls is fabricated, developed, and tested to investigate the ability to suppress flutter and reduce gust loads with active controlled surfaces. The model is analyzed and tested in both semispan and complete model configuration. Analytical methods are refined and control laws are developed and successfully tested on both versions of the model. A 15 to 25 percent increase in flutter speed due to the active system is demonstrated. The capability of an active control system to significantly reduce wing bending moments due to turbulence is demonstrated. Good correlation is obtained between test and analytical prediction
Classifying Organizations for Food System Ontologies using Natural Language Processing
Our research explores the use of natural language processing (NLP) methods to
automatically classify entities for the purpose of knowledge graph population
and integration with food system ontologies. We have created NLP models that
can automatically classify organizations with respect to categories associated
with environmental issues as well as Standard Industrial Classification (SIC)
codes, which are used by the U.S. government to characterize business
activities. As input, the NLP models are provided with text snippets retrieved
by the Google search engine for each organization, which serves as a textual
description of the organization that is used for learning. Our experimental
results show that NLP models can achieve reasonably good performance for these
two classification tasks, and they rely on a general framework that could be
applied to many other classification problems as well. We believe that NLP
models represent a promising approach for automatically harvesting information
to populate knowledge graphs and aligning the information with existing
ontologies through shared categories and concepts.Comment: Presented at IFOW 2023 Integrated Food Ontology Workshop at the
Formal Ontology in Information Systems Conference (FOIS) 2023 in Sherbrooke,
Quebec, Canada July 17-20th, 202
Recommended from our members
Multi-ancestry study of blood lipid levels identifies four loci interacting with physical activity.
Many genetic loci affect circulating lipid levels, but it remains unknown whether lifestyle factors, such as physical activity, modify these genetic effects. To identify lipid loci interacting with physical activity, we performed genome-wide analyses of circulating HDL cholesterol, LDL cholesterol, and triglyceride levels in up to 120,979 individuals of European, African, Asian, Hispanic, and Brazilian ancestry, with follow-up of suggestive associations in an additional 131,012 individuals. We find four loci, in/near CLASP1, LHX1, SNTA1, and CNTNAP2, that are associated with circulating lipid levels through interaction with physical activity; higher levels of physical activity enhance the HDL cholesterol-increasing effects of the CLASP1, LHX1, and SNTA1 loci and attenuate the LDL cholesterol-increasing effect of the CNTNAP2 locus. The CLASP1, LHX1, and SNTA1 regions harbor genes linked to muscle function and lipid metabolism. Our results elucidate the role of physical activity interactions in the genetic contribution to blood lipid levels
- …