scholarly journals Variation of Methods in Small-Scale Safety and Thermal Testing of Improvised Explosives

2014 ◽  
Vol 40 (1) ◽  
pp. 109-126 ◽  
Author(s):  
Mary M. Sandstrom ◽  
Geoffrey W. Brown ◽  
Daniel N. Preston ◽  
Colin J. Pollard ◽  
Kirstin F. Warner ◽  
...  
Keyword(s):  
Small Scale ◽  
Thermal Testing ◽  
Improvised Explosives

scholarly journals DHS small-scale safety and thermal testing of improvised explosives-comparison of testing performance

2014 ◽  
Vol 500 (5) ◽  
pp. 052037
Author(s):  
J G Reynolds ◽  
M M Sandstrom ◽  
G W Brown ◽  
K F Warner ◽  
J J Phillips ◽  
...  
Keyword(s):  
Small Scale ◽  
Thermal Testing ◽  
Testing Performance ◽  
Improvised Explosives

scholarly journals Dissemination and Planned Demonstrator of New Precast Concrete Sandwich Panels

Proceedings ◽  
2018 ◽  
Vol 2 (15) ◽  
pp. 1152
Author(s):  
Aidan Reilly ◽  
Richard O'Hegarty ◽  
Oliver Kinnane
Keyword(s):  
Thermal Performance ◽  
Precast Concrete ◽  
Sandwich Panels ◽  
National Standards ◽  
Structural Performance ◽  
Small Scale ◽  
Thermal Testing ◽  
Bending Tests ◽  
The Uk ◽  
Better Than

This paper presents work developing thin precast concrete sandwich panels for recladding and overcladding applications. These panels are designed for the retrofit of precast concrete structures where the underlying frame is structurally sound. Structural and thermal testing has been carried out to validate the performance of the panels. The panels are designed to have thermal performance better than current national standards, and this has been verified through hot-box testing of components and small-scale panels. Structural performance of the panels has been tested with 3 point bending tests on full-scale panels. Work is in progress towards demonstration of the panels on an occupied building in the UK.

Aerogel for Microsystems Thermal Insulation: System Design and Process Development

2005 ◽  
Author(s):  
Brian Smith ◽  
David Romero ◽  
Damena Agonafer ◽  
Jason Gu ◽  
Cristina H. Amon
Keyword(s):  
Thermal Insulation ◽  
Large Scale ◽  
Process Development ◽  
System Modeling ◽  
Dielectric Constants ◽  
Thermal Design ◽  
Small Scale ◽  
Thermal Testing ◽  
High Porosity ◽  
Crystal Oscillator

Extreme miniaturization in the microelectronics component market along with the emergence of system-on-chip applications has driven interest in correspondingly small-scale thermal management designs requiring novel material systems. This paper concentrates on aerogel, which is an amorphous, nanoporous dielectric oxide fabricated through a sol-gel process. Its extremely high porosity leads to very low thermal conductivity and dielectric constants. Significant research has been devoted to its electrical properties; however, there are several emerging applications that can leverage the thermal characteristics as well. Two promising applications are investigated in this paper: a monolithically integrated infrared sensor that requires thermal isolation between sensor and silicon substrate, and an ultra-miniature crystal oscillator device which demands thermal insulation of the crystal for low-power operation. This paper identifies the potential benefits of aerogel in these applications through system modeling, demonstrates aerogel’s compatibility with standard low-cost microfabrication techniques, and presents results of thermal testing of aerogel films compared with other microelectronics insulators and available data in the literature. The goal is to explore system thermal design using aerogel while demonstrating its feasibility through experimentation. The combination of numerical simulations, Bayesian surrogate modeling, and process development helps to refine candidate aerogel applications and allow the designer to explore thermal designs which have not previously been possible in large-scale microelectronics system production.   This paper was also originally published as part of the Proceedings of the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems.

Used Nuclear Fuel Transportation Package Seal Performance in Beyond Design Basis Thermal Conditions

2011 ◽  
Author(s):  
Felix Gonzalez ◽  
Christopher Bajwa ◽  
Robert Einziger ◽  
Earl Easton ◽  
Jiann Yang ◽  
...  
Keyword(s):  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Experimental Testing ◽  
Thermal Conditions ◽  
Nuclear Regulatory Commission ◽  
Pressure Vessels ◽  
Radioactive Material ◽  
Small Scale ◽  
Thermal Testing ◽  
Design Basis

The U.S. Nuclear Regulatory Commission (NRC) is evaluating the performance of seals in used fuel transportation packages during beyond-design-basis fires, similar to the Baltimore tunnel fire that occurred in 2001. The performance of package seals is important for determining the potential for a release of radioactive material from a package during a beyond-design-basis accident. Seals generally have lower temperature limits than other package components and are often part of the containment barrier between the environment and the cask contents. The NRC’s Office of Nuclear Regulatory Research (RES) funded the National Institute of Standards and Technology (NIST) to conduct small-scale thermal testing to obtain experimental data of the performance of seals during beyond-design basis temperature exposures. The experimental testing consisted of several small-scale pressure vessels fabricated with a modified ASME flange design, using commercial grade metallic seals, similar to those that might be used on an actual spent nuclear fuel transportation package. The vessels were heated in an electrical furnace for exposures up to 9 hours (hrs) at temperatures as high as 800°C (1472°F), which far exceeded the rated temperature of the seals in question. This paper will provide a summary of the testing completed as well as the preliminary results and conclusions of the experiments performed by NIST.

Spent Nuclear Fuel Transportation Package Seals in Beyond Design Basis Temperature Excursions

2012 ◽  
Author(s):  
Felix Gonzalez ◽  
Christopher Bajwa ◽  
Robert Einziger ◽  
Earl Easton ◽  
Jiann Yang ◽  
...  
Keyword(s):  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Experimental Testing ◽  
Extreme Temperature ◽  
Nuclear Regulatory Commission ◽  
Pressure Vessels ◽  
Radioactive Material ◽  
Small Scale ◽  
Thermal Testing ◽  
Design Basis

The US Nuclear Regulatory Commission (NRC) is studying the performance of seals in spent nuclear fuel (SNF) transportation packages exposed to fires that could exceed the hypothetical accident condition fire described in Title 10 of the Code of Federal Regulations, Part 71, such as the Baltimore Tunnel Fire that occurred in 2001, or the MacArthur Maze fire that occurred in 2007. The performance of package seals is important for determining the potential for release of radioactive material from a package during a beyond-design-basis accident. Seals generally have lower temperature limits than other package components and are the containment barrier between the environment and the radioactive package contents. The NRC Office of Nuclear Regulatory Research contracted the National Institute of Standards and Technology to conduct small-scale thermal testing to obtain experimental data of the performance of seals during extreme temperature exposures. The experimental testing consisted of several small-scale pressure vessels fabricated with a modified ASME flange design and tested metallic and polymeric seals, similar to those that might be used on an actual SNF transportation package. The vessels were heated in an electrical oven to temperatures as high as 800°C (1472°F), exceeding the rated temperatures of the seals in question. This paper will provide a summary of the testing conducted and present test results and conclusions.

Thermal testing and numerical simulation of PCM wall integrated inside a test cell on a small scale and subjected to the thermal stresses

2019 ◽  
Vol 135 ◽  
pp. 597-607 ◽  
Author(s):  
Farah Mehdaoui ◽  
Majdi Hazami ◽  
Anis Messaouda ◽  
Hichem Taghouti ◽  
AmenAllah Guizani
Keyword(s):  
Numerical Simulation ◽  
Thermal Stresses ◽  
Test Cell ◽  
Small Scale ◽  
Thermal Testing

scholarly journals Statistical Analysis of an Inter-Laboratory Comparison of Small-Scale Safety and Thermal Testing of RDX

2014 ◽  
Vol 40 (2) ◽  
pp. 221-232 ◽  
Author(s):  
Geoffrey W. Brown ◽  
Mary M. Sandstrom ◽  
Daniel N. Preston ◽  
Colin J. Pollard ◽  
Kirstin F. Warner ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Small Scale ◽  
Thermal Testing

Reasons to strike first

2019 ◽  
Vol 42 ◽  
Author(s):  
William Buckner ◽  
Luke Glowacki
Keyword(s):  
Intergroup Conflict ◽  
Small Scale

Abstract De Dreu and Gross predict that attackers will have more difficulty winning conflicts than defenders. As their analysis is presumed to capture the dynamics of decentralized conflict, we consider how their framework compares with ethnographic evidence from small-scale societies, as well as chimpanzee patterns of intergroup conflict. In these contexts, attackers have significantly more success in conflict than predicted by De Dreu and Gross's model. We discuss the possible reasons for this disparity.

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