Engineering topics
Publications and source records attributed to Tucker, Mark D..
The present invention relates to a metal-organic framework composition, as well as constructs and methods thereof. In one particular example, the composition is employed to degrade a chemical agent in a non-aqueous environment.
The present disclosure is directed to highly concentrated foam formulations for blast suppression and dispersion mitigation. for use in responding to a terrorism incident involving a blast dispersion device. The foam formulation is more concentrated and more stable than current blast suppression foams, which reduces the logistics burden on the user.
In 2018 Sandia National Laboratories launched the Civilian Cyber Strategic Initiative, an ongoing multi-year effort to characterize future threats to civilian cyber infrastructures, to inform research and development efforts to detect, attribute, counter, and recover from cyber attacks, and to inform program and capability investment decisions across the Energy and Homeland Security portfolio at Sandia. One of the primary objectives of the Civilian Cyber Strategic initiative is to leverage Sandia's systems analysis capabilities to characterize future threats and to support a new theory of deterrence. Towards the goal of supporting a new theory of deterrence in cyberspace, the purpose of this study was to understand how new and existing deterrence paradigms can be applied to cyberspace, to identify unique challenges and pitfalls associated with deterring adversaries in cyberspace, and to develop preliminary ideas for how our ability to deter cyber adversaries might be improved. Our approach combined literature reviews of relevant policy documents and the academic literature with interviews of experts both at Sandia and beyond.
This report pulls together the documentation produced for the IMPACT tool, a software-based decision support tool that provides situational awareness, incident characterization, and guidance on public health and environmental response strategies for an unfolding bio-terrorism incident.
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A method for sequestering technetium is disclosed. The method includes contacting technetium with apatite under reducing conditions whereby the technetium is absorbed by the apatite.
A method for sequestering selenium is disclosed. The method includes contacting selenium with a stannous modified apatite under conditions whereby the selenium is absorbed by the apatite.
The objective for the experimental effort was to provide validation for the electrostatic aerosol transport models for particle size and deposition rate and to determine the feasibility of an electrostatic spray process in delivering non-corrosive decontaminants to complex interior spaces, such as an aircraft. The project utilized ITW (Illinois Tool Works) rotary atomizing induction charged nozzle to disperse small, charged droplets of liquid decontaminants uniformly through a contaminated space. Particle size and deposition studies were conducted prior to the feasibility study where the ITW nozzle was optimized and characterized for two decontaminants: EasyDeconTM200 (DF-200) and Steriplex® SD. In addition to the validation studies, two feasibility studies were conducted with anthrax simulant (B. atrophaeus) and sarin simulant (diphenol chlorophosphate, DPCP). Running parameters for the two studies varied according to the starting contaminant challenges (1.0 x 108 CFU/m 2 for B. atrophaeus and 1.0 g/m 2 for DPCP), the amount of decontaminant deposition, and, finally, decontaminant to agent contact time. Results for the DPCP study confirm that our spray method met and exceeded the threshold criteria of <10 mg/m 2 , postdecontamination, for Teflon and aluminum coupons. Results from this study also showed that polycarbonate and rubber coupons can be reduced by <98% and <92%, respectively. Results for the B. atrophaeus study presented a slightly different challenge due to coupon size, however, increasing the size of the coupon confirmed that it is possible for our spray method to meet the threshold criteria of <100 CFU/m 2 . In addition, a computational model was developed in ANSYS Fluent to solve for the air flow, space charge, electric field, and droplet motion involved in electrostatic aerosol transport. Comparison of the model to experiments resulted in good agreement in deposition pattern and total mass deposited on surfaces. Finally, as a consequence of this project, the methodology used for decontamination could be used to improve future contamination scenarios by eliminating or reducing contaminant hazards, thereby allowing equipment and/or facilities, previously unusable, to be reclaimed rather than discarded, resulting in an overall cost savings to the customer.
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