... Accession Number : ADA496361. Title : Accelerated Aging Study of PBXN-109 Formulated With Insensitive RDX. Descriptive Note : Briefing charts. ...
DTIC Science & Technology
... full scale aging of propellants could be performed. A tchree-year plan) for the accelerated aging of 17 different solid propellant formulations was ...
The accelerated aging characteristics of an aluminized acrylic reflector material (3M Company ECP-244) were studied when bonded to either an aluminum or acrylic painted steel substrate. The aging consisted of temperature/humidity cycling between extremes ...
National Technical Information Service (NTIS)
This study was composed of three parts: a post cure study to optimize final properties of an ethylene-propylene-diene (EPDM) formulation, an accelerated aging study to compare the stress relaxation behavior of a butyl and an EPDM elastomer under compressi...
An accelerated aging study has been performed with an HTPB (hydroxy terminated polybutadiene) propellant having formulation number TP-H1139. An aging model has been suggested to describe the aging effects on the chemical reaction kinetics in the binder an...
An accelerated aging study performed with ANB-3066 propellant shows that it conforms to the same aging law or model that describes the aging behavior for TP-H1011 propellant. The crosslinking reaction of imine from the curing agent and carboxyl from the p...
... AGING(MATERIALS), TEST METHODS, FUELS, ENGINES, INHIBITION, ACCELERATED TESTING, BROMINE, PEROXIDES, DISTILLATES. ...
... observation, and scored lower on appropriate braking and acceleration, the study found. Men and women performed equally ...
MedlinePLUS
... The Accelerated Ageing of some Commercial Polyurethane Rubbers ,j 4~ ... r The Accelerated Ageing of some Commercial Polyurethane Rubbers by ...
Another aging methodology considered the effect ... In another study on the effects of high gate ... reverse recovery current and the body region resistance ...
NASA Website
A study was made by the Reasearch Directorate, Weapons Laboratory at Rock Island to update and standardize methods and equipment for use in the evaluation of accelerated deterioration of coated fabrics. The coated fabrics were exposed to accelerated and n...
Although the studies of the effect of ionizing radiation on atomic bomb survivors have not produced any evidence of radiation-induced aging, there have been studies on experimental animals and man which suggest accelerated aging after exposure to ionizing...
The evidence of research looking at accelerated aging among gay men is contradictory. In this study the issue of accelerated aging is addressed by accounting for the duality of the gay man's lifestyle as he interacts in both the homosexual community and the larger society where heterosexuality ...
PubMed
This document describes the results of accelerated aging tests to determine the long-term effectiveness of selected impoundment liner materials in a uranium mill tailings environment. The study was sponsored by the US Department of Energy under the Uraniu...
The Institute of Nuclear Sciences accelerator mass spectrometry system has been used to determine the ages of a selection of spicules from crown of thorns starfish, collected at the Great Barrier Reef, Queensland. The measurements constitute a pilot study...
This report describes the results of accelerated aging experiments (weathering) conducted on prototype tamper tapes bonded to a variety of surface materials. The prototype tamper tapes were based on the patented Confirm(reg sign) tamper-indicating technol...
An accelerated aging study of AlGaAs/GaAs solar cells has been completed. The purpose of the study was to identify the possible degradation mechanisms of AlGaAs/GaAs solar cells in terrestrial applications. Thermal storage tests and accelerated AlGaAs cor...
Objectives are to develop a physical understanding of aging and failure in extruded cable insulations, and to develop accelerated tests for predicting the service life of such cables. Task 3 designed to verify aging models postulated during Task 2, is now...
... Descriptors : *ELECTRON ACCELERATORS, *LINEAR ACCELERATORS, *MICROWAVES, *TRAVELING WAVE ELECTRON ACCELERATORS ...
A thermally-accelerated aging study of 10 selected organic materials used in a fireset has been conducted. The study included both quantitative and qualitative gas analyses as well as the measurement of physical properties before and after accelerated aging. The test plan ...
Energy Citations Database
A study has been carried out in order to develop methods for determining failure mechanisms of IMPATT diodes and for accelerating them in a controlled way. Interactions between the constituents of the contact metallizations leading to catastrophic thermal runaways are shown to be the principal mechanism of degradation and failure of IMPATT diodes. It is ...
NASA Astrophysics Data System (ADS)
The purpose of this program was to study, investigate and develop test and measurement techniques for controllably accelerating the aging processes in tantalum thin film R-C networks, and to investigate the physics of failure associated with the networks....
A previously developed test design for accelerated aging of photovoltaic modules was experimentally evaluated. The studies included a review of relevant field experience, environmental chamber cycling of full size modules, and electrical and physical eval...
A previously developed test design for accelerated aging of photovoltaic modules was experimentally evaluated. The studies included a review of relevant field experience, environmental chamber cycling of full-size modules, and electrical and physical eval...
These batteries are for use in systems which require a storage life of 25 years and high reliability. This compatibility and aging study incorporates all of the materials in the system, both organic and inorganic, except the heat paper and electric match....
... the reliance on nuclear weapons, accelerate reductions in ... offered by the pit aging report might ... of Congress have said the plutonium studies raised ...
... adding $4.0 million to �accelerate the deployment ... on life� offered by the pit aging report might ... of Congress have said the plutonium studies raised ...
The deterioration of petroleum fuels was studied by investigation of their autoxidation susceptibilities. Federal and Military Specification fuels and commercial gasolines were subjected to a six-week accelerated aging test with analyses for generated hyd...
... of rubbers, ie, the presence of anti-oxidants, accelerators ... pyrolysis GC/MS to determine aging of a ... abundance of the degradation products or could ...
... (joules) 6-month ESD (joules) 12-month ESD (joules) Royal Ordnance Type 1 Class 1 ... James Thomasson for their contributions to this paper. We ...
These batteries are for use in systems which require a storage life of 25 years and high reliability. This compatibility and aging study incorporates all of the materials in the system, both organic and inorganic, except the heat paper and electric match. Results indicate no compatibility or aging problems. These results are: oxygen ...
Sep 13, 2010 ... IGBT accelerated aging data set. A dataset shared by ... Home> Nikunj Oza > Resources> IGBT accelerated aging data set. About DASHlink ...
Two cable types, which currently are used in nuclear power plants (NPP) and which are composed by jacket/insulation materials, i.e. PVC/PVC and PVC/PE, were exposed to accelerated ageing conditions, in order to simulate their behavior after 10 years in service. The cables were aged under two different test conditions:With relatively ...
The color stability of seven commercial composite resins, an unfilled resin, and three glazes was studied under conditions of accelerated aging by reflection spectrophotometry and visually with Munsell color tabs. After aging for 900 hours, most of the resins had lower values of luminous reflectance and excitation ...
An accelerated aging study of AlGaAs/GaAs solar cells has been completed. The purpose of the study was to identify the possible degradation mechanisms of AlGaAs/GaAs solar cells in terrestrial applications. Thermal storage tests and accelerated AlGaAs corrosion studies were ...
The decline in olfaction with age is well documented in histological, psychological, and electroencephalographical studies. However, there are few electrophysiological studies on changes in the sensitivity of the peripheral olfactory cells with age. We evaluated the behavior, the amplitude of electro-olfactogram ...
An experimental technique developed to study accelerated ageing of material systems used in microelectronics is described. The method is useful for material systems of which the aging can be characterized by the DC electrical resistance or the AC impedanc...
This contract covered studies of the following endpoints in proton- irradiated rhesus monkeys and in age-matched controls: (1) Radiation-accelerated aging of skin fibroblasts in vitro; (2) Wound healing in vivo; (3) Late radiogenic cataracts in rhesus mon...
The authors are working to understand why predictions of degradation behaviors and rates, based on accelerated thermal aging experiments, often fail to match with aging of polymers under service conditions. A main goal of these studies is to develop more reliable lifetime prediction methodologies.
DOE Information Bridge
This research program has the two basic objectives of developing an understanding of the basic mechanisms of dielectric aging and of developing an accelerated laboratory test for predicting the service life of underground power transmission cable insulate...
A technique for accelerating the aging process of thermally activated batteries that use iron disulfide was developed. In this approach, storage at 130 exp 0 C for one week was assumed equivalent to a shelf life of five years. Some of the batteries stored...
A valid method of studying age related degenerative pathologies is to study human genetic diseases that appear to accelerate many, though not necessarily all, features of the aging process. Such diseases are described as progeroid syndromes because of their possible relevance to many aspects of ...
PubMed Central
Estimation of age by appearance, skin elasticity and looseness, and hair graying were studied in the irradiated and nonirradiated population of Hiroshima. No differences in these several measurements were detected between the radiation- exposed and nonexposed components of the sample. The study provided no support for the ...
... Descriptors : *AGING(MATERIALS), *SEMICONDUCTOR DEVICES, *ACCELERATED TESTING, LIFE EXPECTANCY(SERVICE LIFE), COST ...
... Accession Number : ADD875368. Title : SANDIA LSI ACCELERATED AGING AND DATA ACQUISITION TECHNIQUES. Corporate Author : ...
degradation models and prediction of remaining useful life. The accelerated aging system is designed for the exploration of intrinsic degradation mechanisms ...
... Title : ACCELERATED AGING OF NYLON 66 AND KEVLAR 29 IN ELEVATED TEMPERATURE, ELEVATED HUMIDITY, SMOG, AND OZONE. ...
Thermally activated batteries using the lithium (silicon) iron disulfide (Li(Si)/FeS2) electrochemical system are used in weapons having a required storage life of 25 years and high reliability. A review of known data revealed no information on the compatibility of Li(Si)/FeS2 with the organic materials used in the system. The compatibility question is studied. ...
This study was composed of three parts: a post cure study to optimize final properties of an ethylene-propylene-diene (EPDM) formulation, an accelerated aging study to compare the stress relaxation behavior of a butyl and an EPDM elastomer under compression, and a cursory evaluation of a new 70 ...
Batteries for solar photovoltaic applications and other terrestrial applications require long life in daily cycling regimes. There is a need to develop testing procedures to accelerate aging of electrochemical cells so that cycle life data can be acquired in less time than real time testing would require. The initial emphasis has been on lead-acid type ...
... PARTICLE ACCELERATORS, *TRITIUM, *PRODUCTION ENGINEERING, FEASIBILITY STUDIES, PARTICLE ACCELERATOR TARGETS, HELIUM ...
The objective of this paper was to study glass fiber reinforced cementitious composites (GFRCC) with Portland cement, a high content of fly ash as matrix. The effect of fly ash content, the initial curing time, and accelerated aging on the flexural strength of GFRCC was investigated. The suitability of the ...
Accelerated aging tests such as high temperature burn-in, which are in current use on Bendix Kansas City Division's (BKC) purchased small and medium scale integrated circuits, were evaluated to determine if they are effective and necessary to ensure the required reliability. A theoretical analysis, a literature search, and a ...
This report represents a study of the accelerated aging of chemically modified handsheets in air and nitrogen at 90C and 50 percent or 0 percent relative humidity. The handsheets were prepared from a commercial wood pulp that had been either (a) untreated...
accelerate electrons? Parameter dependence of electron acceleration at shocks ? ... al., 2005). Many studies on ions, but how about electron acceleration ? ...
... increases with age or in the presence of diabetes. The present study reveals that the relative contribution ... and it is accelerated in the presence of diabetes (8,9). Several fluorescent compounds have ...
NBII National Biological Information Infrastructure
Since a realistic aging of cast stainless steel components for end-of-life or life-extension conditions cannot be produced, it is customary to simulate the thermal aging embrittlement by accelerated aging at /approximately/400/degree/C. In this investigation, field components obtained from decommissioned reactors ...
A previously developed test design for accelerated aging of photovoltaic modules was experimentally evaluated. The studies included a review of relevant field experience, environmental chamber cycling of full-size modules, and electrical and physical evaluation of the effects of accelerated ...
Accelerated aging of Nylon 6.6 fibers used in parachutes has been conducted by following the tensile strength loss under both thermal-oxidative and 100% relative humidity conditions. Thermal-oxidative studies (air circulating ovens) were performed for time periods of weeks to years at temperatures ranging from 37 C to 138 C. ...
Schizophrenia is associated with a number of anatomical and physiological abnormalities outside of the brain, as well as with a decrease in average life span estimated at 20% in the United States. Some studies suggest that this increased mortality is not entirely due to associated causes such as suicide and the use of psychotropic medications. In this article, in order to ...
One of the many debated topics in ageing research is whether progeroid syndromes are really accelerated forms of human ageing. The answer requires a better understanding of the normal ageing process and the molecular pathology underlying these rare diseases. Exciting recent findings regarding a severe human ...
