Test methods on Binder Selection for Antiskid Surface Applications

2012 ◽  
Author(s):  
Y. Xiao ◽  
M. F. C. van de Ven ◽  
A. A. A. Molenaar ◽  
M. L. Li
Keyword(s):  
Test Methods ◽  
Selection For

Materials Selection for Long Life in Low Earth Orbit: A Critical Evaluation of Atomic Oxygen Testing with Thermal Atom Systems

1990 ◽  
Vol 33 (2) ◽  
pp. 50-59
Author(s):  
S. Koontz ◽  
K. Albyn ◽  
L. Leger
Keyword(s):  
Atomic Oxygen ◽  
Critical Evaluation ◽  
Test Methods ◽  
Low Earth Orbit ◽  
Screening Tools ◽  
Earth Orbit ◽  
Materials Selection ◽  
New Type ◽  
Long Life ◽  
Selection For

The use of thermal atom test methods as a materials selection and screening technique for low-earth orbit (LEO) spacecraft is critically evaluated. The chemistry and physics of thermal atom environments are compared with the LEO environment. The relative reactivities of a number of materials determined in thermal atom environments are compared with those observed in LEO and in high-quality LEO simulations. Reaction efficiencies (cm3 atom-1) measured in a new type of thermal atom apparatus are one-thousandth to one ten-thousandth those observed in LEO, and many materials showing nearly identical reactivities in LEO show relative reactivities differing by as much as a factor of eight in thermal atom systems. A simple phenomenological kinetic model for the reaction of oxygen atoms with organic materials can be used to explain the differences in reactivity in different environments. Certain specific thermal atom test environments can be used as reliable materials screening tools.

Properties, Weldability, and Applications of Modern Wrought Heat-Resistant Alloys for Aerospace and Power Generation Industries

2004 ◽  
Vol 128 (2) ◽  
pp. 354-361 ◽  
Author(s):  
M. D. Rowe ◽  
V. R. Ishwar ◽  
D. L. Klarstrom
Keyword(s):  
Power Generation ◽  
Thermal Stability ◽  
Gas Turbine ◽  
Test Methods ◽  
Limiting Factor ◽  
High Temperature Strength ◽  
Critical Properties ◽  
Heat Resistant ◽  
Selection For ◽  
Alloy Properties

Alloy selection and alloy design both require consideration of an array of material attributes, including in-service properties, weldability, and fabricability. Critical properties of modern heat-resistant alloys for gas turbine applications include high-temperature strength, thermal stability, oxidation resistance, and fatigue resistance. In this paper, the properties of 12 solid-solution-strengthened and six age-hardenable heat-resistant alloys are compared. Weldability is an important attribute and can be a major limiting factor in the use of certain alloys. Weldability test methods are discussed, and the resistance of alloys to solidification cracking and strain-age cracking is compared. The use of weldability testing in the development of modern heat-resistant alloys is discussed with several examples cited. Finally, alloy selection for gas turbine components is outlined, taking into account both alloy properties and fabricability.

Testing Methods Selection for X-Ray Radiation Performance Index of Micro-Dose X-Ray Transmission Body Scanner

2014 ◽  
Vol 1028 ◽  
pp. 122-126
Author(s):  
Cai Xia Liu
Keyword(s):  
High Sensitivity ◽  
Test Methods ◽  
Test Accuracy ◽  
X Ray ◽  
The Public ◽  
Security Industry ◽  
Advantages And Disadvantages ◽  
Industry Standard ◽  
Selection For ◽  
Body Scanner

The public security industry standard “Generaltechnicalrequirementsformicro-doseX-raytransmissionbodyscanner” (GA 926-2011) was released in March 25, 2011 and was formally implemented in July 1, 2011.The X-rayradiationperformanceindex of micro-dose X-ray transmission body scanner includes DosePerInspection and LeakageRadiationRate. The standard requires that DosePerInspection should be tested by ionization dosimeter. However, it doesn't specify which kind of equipment should be used to test LeakageRadiationRate, and only requires a high sensitivity dosimeter. Therefore it is necessary to synthetically consider numerical features and test accuracy requirements, select appropriate test methods and test equipments. RadiographMethod,IonizationDetectionMethod, ScintillationDetectionMethod and SemiconductorDetectionMethod are analysed and compared from the detection principle, the advantages and disadvantages, IonizationChamberDosimeter was selected to test DosePerInspection, ScintillationDetectionMethod was selected to test LeakageRadiationRate.

Properties, Weldability, and Applications of Modern, Wrought, Heat-Resistant Alloys for Aerospace and Power Generation Industries

2004 ◽  
Author(s):  
M. D. Rowe ◽  
V. R. Ishwar ◽  
D. L. Klarstrom
Keyword(s):  
Power Generation ◽  
Thermal Stability ◽  
Gas Turbine ◽  
Test Methods ◽  
Limiting Factor ◽  
High Temperature Strength ◽  
Critical Properties ◽  
Heat Resistant ◽  
Selection For ◽  
Alloy Properties

Alloy selection and alloy design both require consideration of an array of material attributes, including in-service properties, weldability, and fabricability. Critical properties of modern heat-resistant alloys for gas turbine applications include high temperature strength, thermal stability, oxidation resistance, and fatigue resistance. In this paper, the properties of twelve solid-solution-strengthened and six age-hardenable heat-resistant alloys are compared. Weldability is an important attribute, and can be a major limiting factor in the use of certain alloys. Weldability test methods are discussed and the resistance of alloys to solidification cracking and strain-age cracking is compared. The use of weldability testing in the development of modern heat-resistant alloys is discussed with several examples cited. Finally, alloy selection for gas turbine components is outlined, taking into account both alloy properties and fabricability.

Test Methods Used to Quantify Flight Control Inceptor Selection for a Business Jet Aircraft

2019 ◽  
Author(s):  
Susan A. Taylor ◽  
Gavin R. Essenberg ◽  
Tom C. Horne ◽  
Francois D. Hugon
Keyword(s):  
Flight Control ◽  
Test Methods ◽  
Business Jet ◽  
Selection For

Early Strength Evaluation of High-Performance Emulsified Asphalt Cold Recycled Mixture

2014 ◽  
Vol 505-506 ◽  
pp. 265-269
Author(s):  
De Cai Wang ◽  
Xia Guang Hu ◽  
Yun Xiang Song
Keyword(s):  
High Performance ◽  
Evaluation Method ◽  
Design Method ◽  
Test Methods ◽  
Basic Principles ◽  
Strength Evaluation ◽  
Early Strength ◽  
Selection For ◽  
Key Indicators ◽  
Emulsified Asphalt

On account of the design method shortcomings of cold recycled (CR) mixture with emulsified asphalt,the material compatibility problems between emulsifier and asphalt and RAP were researched,by which the key indicators of emulsified asphalt and the emulsifying effect of different kinds of emulsifier for asphalt is concluded, and summarizes the basic principles of special emulsified asphalt selection for the high-performance CR technology. On the basis of the research at home and abroad, the early strength evaluation methods and indicators are also discussed in this paper that puts forward to three kinds of test methods: cohesive test, raving loss test, coreability test.Finally,the evaluation method was verified in practical project and reached the effect to be hoped.

Framework for Selecting Vocabulary for Preliterate Children Who Use Augmentative and Alternative Communication

2019 ◽  
Vol 28 (3) ◽  
pp. 1000-1009
Author(s):  
Allison Bean ◽  
Lindsey Paden Cargill ◽  
Samantha Lyle
Keyword(s):  
Language Impairment ◽  
Augmentative And Alternative Communication ◽  
Developmentally Appropriate ◽  
School Age Children ◽  
Alternative Communication ◽  
School Based ◽  
Selection For ◽  
Nonverbal Children ◽  
Grammatical Structures ◽  
Insufficient Knowledge

Purpose Nearly 50% of school-based speech-language pathologists (SLPs) provide services to school-age children who use augmentative and alternative communication (AAC). However, many SLPs report having insufficient knowledge in the area of AAC implementation. The objective of this tutorial is to provide clinicians with a framework for supporting 1 area of AAC implementation: vocabulary selection for preliterate children who use AAC. Method This tutorial focuses on 4 variables that clinicians should consider when selecting vocabulary: (a) contexts/environments where the vocabulary can be used, (b) time span during which the vocabulary will be relevant, (c) whether the vocabulary can elicit and maintain interactions with other people, and (d) whether the vocabulary will facilitate developmentally appropriate grammatical structures. This tutorial focuses on the role that these variables play in language development in verbal children with typical development, verbal children with language impairment, and nonverbal children who use AAC. Results Use of the 4 variables highlighted above may help practicing SLPs select vocabulary that will best facilitate language acquisition in preliterate children who use AAC.

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