... DEGRADATION, WEAR, LIFE TESTS, COMMUNICATION SATELLITES, ACCELERATED TESTING, LUBRICATION, ANTENNA COMPONENTS. ...

... Characterizing the degradation of Army primers by the AC-DC-AC accelerated test method ... DC AC-DC-AC accelerated testing method Page 5. ...

Presentation on step-stress accelerated degradation testing (SSADT) for photovoltaics (PV). Developed are a step-stress degradation test (SSADT) for PV reliability tests and a lifetime prediction model for PV products.

... the service life of two ... data obtained at high temperatures and ... MATERIALS), DEGRADATION, ACCELERATED TESTING, HUMIDITY, REACTION ...

... PLASTICS, *WEATHERING, MECHANICAL PROPERTIES, LABORATORY TESTS, DEGRADATION, CHEMICAL PROPERTIES, PHYSICAL ...

... PHYSIOLOGY), AMIDES, BALLISTICS, BUTYL RADICALS, CLIMATE, DEGRADATION, ETHYL RADICALS, GUANIDINES, PHENYL RADICALS ...

temperatures are above 20�C, because this additional stress was found to replicate solder bond degradation observed outdoors in use [12- 14]. This degradation is characterized...

Results of the performance tests on unencapsulated cells are described. Equivalent circuit parameters, characteristics of a degraded solar cell, and atomic and molecular species at the cell surface are detailed.

... Accession Number : ADA532691. Title : Characterizing the Degradation of Army Primers by the AC-DC-AC Accelerated Test Method. ...

influencing the process of mechanical degradation, chemical aging, and physical aging. The rates and degree of interaction of these three processes are ...

Potential long-term degradation modes for the two types of modules in the Mead array were determined and judgments were made as to those environmental stresses and combinations of stresses which accelerate the degradation of the power output. Hierarchical...

For the development of accelerated testing methodology to estimate the life time of electric cable, which is installed in radiation field such as a nuclear reactor containment vessel, radiation and thermal combined degradation of cable insulation and jack...

A method and test apparatus for carrying out testing on a variety of samples of polymer bonded to metal wherein the samples are subjected to an accelerated cathodic reaction causing cathodic delamination of the samples. In particular, a the method and tes...

... EXPECTANCY(SERVICE LIFE), *DEGRADATION, MILITARY ... RANGE(TIME), HIGH STRENGTH, ACCELERATED TESTING, ROOFS. ...

leveraging data from an accelerated aging tests on IGBTs. The accelerated aging test provided thermal- ... During high-voltage operation, large internal electrical ... rate of degradation. For prognostic purposes the externally ...

The paper briefly summarizes the results from several accelerated exposure tests (AET) studies. Causes responsible for the photothermal instability of the encapsulated Si solar cells appear to be multiple and complex.

research. 2 Models for Degradation 2.1 Degradation leading to failure Many product failures can be traced of a degradation model requires not only specification of the form of the D(t; fi) function, but also specification degradation level For some products there is a gradual loss of performance (e.g., decreasing ...

highly elliptical orbit will have perihelion close to the Sun and aphelion at more than 5 AU. ..... degradation mechanisms and accelerated life testing. ...

To verify the 15-year reliability of the Navy half-watt radioisotope thermoelectric generator (RTG),

Jun 16, 2011 � ... and thermal stability of saltcedar flour were compared with those of ... Tamarix ramosissima, accelerated testing, thermal degradation, ...

Potential long-term degradation modes for the two types of modules in the Mead array were determined

A new method is proposed for collectively accelerating bunches of ions with an intense relativistic-electron beam. By varying the beam energy in time, acceleration of a slow Doppler-shifted cyclotron wave can be accomplished, without accompanying degradation of the beam equilibrium. Test-particle calculations ...

Spent fuel tests in support of Yucca Mountain have been performed for many years. Most of these tests have been either single-pass flowthrough (SPFT) or unsaturated drip tests that have been used to elucidate waste form degradation rates. In general, the tests have been considered ...

Potential long-term degradation modes for the two types of modules in the Mead array were determined and judgments were made as to those environmental stresses and combinations of stresses which accelerate the degradation of the power output. Hierarchical trees representing the severity of effects of stresses (test ...

Tutorial article by ReliaSoft (Issue 65, Juldy 2006). The article begins: " Step-stress testing is a very common type of accelerated testing. It is a good way to obtain failures in a relatively short amount of time. There are many variations of step-stress testing. A common type is one in which the units are ...

A photoreaction-diffusion model for the solar degradation of thermal control materials is mathematically formulated and analyzed. The governing differential equation for the concentration of defect specie created in the material by radiation is derived, a...

The fundamental mechanisms underlying the chemical degradation of polymers can change as a function of environmental stress level. When this occurs, it greatly complicates any attempt to use accelerated tests for predicting long-term material degradation behaviors. Understanding how degradation ...

degradation models and prediction of remaining useful life. The accelerated aging system is designed for the exploration of intrinsic degradation mechanisms ...

To meet the challenge to reduce the cost of electricity generated with concentrating solar power (CSP) new low-cost reflector materials are being developed including metalized polymer reflectors and must be tested and validated against appropriate failure mechanisms. We explore the application of testing methods and statistical inference techniques for ...

A DS-416 low voltage air circuit breaker manufactured by Westinghouse was mechanically cycled to identify age-related degradation in the various breaker subcomponents, specifically the power-operated mechanism. This accelerated aging test was performed on...

Degradation of inhibited gylcol solution leads to corrosion of metals in a solar-energy system. Corrosion was monitored at three sites. To evaluate the extent of corrosion, accelerated laboratory tests were performed. These tests were directed toward cont...

Filament wound test specimens of glass fiber/polyester, glass fiber/epoxy and carbon fiber/epoxy were stored 6 months under accelerated conditions, 40 C/80% RH and 60 C/80% RH respectively. The report contains humidity uptake curves and results from the v...

Low dose rate gain degradation of lateral pnp bipolar transistors can be simulated by accelerated irradiations performed at approximately 135 degrees C. Degradation enhancement is explained by temperature- dependent radiation-induced interface trap formation above the transistor`s base.

One of the causes of the degradation in rail accelerator performance is the formation of a secondary

This report covers work that was to correlate wafer level test structure tests with life tests by utilizing test structures collocated with a RAM-like device. Wafer level tests for oxide breakdown, electromigration, and hot carrier degradation were conduc...

Accelerated lifetime testing has been performed to estimate the length of time Cds/Cu(x)S solar cells can efficiently convert solar to electrical energy without significant degradation. A simulator has been used that has the capability of uniform test cel...

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...

Using concentrated natural sunlight at the NREL High Flux Solar Furnace, we have exposed several materials to acceleration factors of up to 400 times the normal outdoor UV exposure dose. This accelerated rate allows the exposure of materials such that a year of outdoor exposure can be simulated in about 5 hours. We have studied the solarization of cerium ...

Accelerated degradation of organic chemicals by aquatic plant-bacterial associations was reported for the first time with elucidation of the role and contribution of aquatic plant and bacteria in its rhizosphere using a fast-growing giant duckweed, Spirodela polyrrhiza. The results clearly showed the accelerated ...

We introduce a cutting-edge life-testing technique, accelerated degradation testing (ADT), for PV reliability testing. The ADT technique is a cost-effective and flexible reliability testing method with multiple (MADT) and Step-Stress (SSADT) variants. In an environment with ...

Homogeneous and radiatively grafted membranes were evaluated as separators for the zinc/ferricyanide storage battery. An accelerated aging test demonstrated that membrane failures could be attributed to both mechanical and chemical mechanisms. A series of...

of solder connections on under the hood electronic components with that expected through accelerated testingChrysler Electronics in Huntsville, Alabama. The project aimed to correlate wear and degradation of solder connections background in the natural sciences, worked primarily on the examination of the solder joint material through

additives designed to mitigate membrane degradation via hydrogen peroxide. This project has built upon and ionomer degradation because it aids in the generation of hydrogen peroxide. Extensive single cell testing improvement over the MEA made with Nafion� 112. #12;Figure 6. Accelerated Test ...

A DS-416 low voltage air circuit breaker manufactured by Westinghouse was mechanically cycled to identify age-related degradations. This accelerated aging test was conducted for over 36,000 cycles during nine months. Three separate pole shafts, one with a...

A standard accelerated weathering test using Dimethyl Sulfoxide (DMSO) was developed to simulate the chemical degradation of basaltic rocks. The recommended procedure consists of immersing a sample of aggregate in the size range between 2.38 mm and 4.76 m...

System designers and end users of diode pumped solid state lasers often require knowledge of the operability limits of QCW laser diode pump sources and their predicted reliability performance as a function of operating conditions. Accelerated ageing at elevated temperatures, duty cycles and/or currents allows extended lifetime testing of diode stacks to be ...

Presented at the 2001 NCPV Program Review Meeting: We report the observed degradation in 6 different types of PV modules as a function of total UV exposure and give a number of recommendations for future weathering tests. Since 1997, using existing ASTM standards for weathering of materials, we have been conducting a solar weathering program on a group of ...

The study was carried out to determine the feasibility of using partially disrupted microorganisms in conjunction with intact cells to accelerate the oxidative degradation of hydrocarbons. Initally, 40 plus organisms were isolated which were capable of degrading some fraction of Bunker C residual fuel oil. These organisms spanned the ...

Irgarol 1051 (2-methylthio-4-tert-butylamino-6-cyclopropylamino-s-triazine) is a herbicide analogue that is added to antifouling agents used on ships. Our former study on its degradation in sunlight suggested that unknown photosensitizers in natural waters accelerated the photodegradation to the degradation product, M1. In this study, ...

The development of an accelerated test schedule for terrestrial solar cells is described. This schedule, based on anticipated failure modes deduced from a consideration of IC failure mechanisms, involves bias-temperature testing, humidity testing (including both 85-85 and pressure cooker stress), and thermal-cycle ...

Accelerated tests on GaAlAs/GaAs double heterostructure laser diodes showed, in agreement with earlier results on light-emitting diodes, that ageing appeared in three distinct forms: initial and slow degradation stages, both obeying a logarithmic time dependence, and a superimposed "gradation" (enhancement of the output power). ...

Pine-needle degradation by Stereum hirsutum was studied under conditions of solid state fermentation with the aim of accelerating its decomposition, avoiding the accumulation in situ and in view of the possible utilization of the residual organic matter. Three experimental systems were tested: pine needles alone and with the addition ...

GaSb-based cells are promising candidates for use in thermophotovoltaic (TPV) systems. In order to assess long term cell performance, suitable accelerated ageing tests are required. So far there are no studies concerning the degradation behaviour of GaSb cells. GaSb-based cells produced from MOVPE-grown structures and from zinc vapour ...

... a nEW PROcESS FOR THE ACCELERATION TEST AND EVALUATION OF AEROMEDICAL EQUIPMENT FOR ... acceleration Testing ...

The test program described in this plan is designed to evaluate both approved and proposed solar collector test procedures and to correlate laboratory, accelerated field and simulated operational exposures with actual field data. The tests and exposure procedures described are intended to determine the influence of ...