A5013234901- Particle Dynamics in Fluid Flows
- Infection Control and Ventilation
- Air Quality and Health Impacts
- Aerosol Filtration and Electrostatic Precipitation
- Air Quality Monitoring and Forecasting
- Advanced biosensing and bioanalysis techniques
- Quantum Dots Synthesis And Properties
- Atmospheric aerosols and clouds
- Indoor Air Quality and Microbial Exposure
- Atmospheric chemistry and aerosols
- Infection Control in Healthcare
- Bacterial Genetics and Biotechnology
- Cyclone Separators and Fluid Dynamics
- Bacillus and Francisella bacterial research
- Biosensors and Analytical Detection
- Recycling and Waste Management Techniques
- Enterobacteriaceae and Cronobacter Research
- Bacteriophages and microbial interactions
- COVID-19 and healthcare impacts
- Nanocluster Synthesis and Applications
- Advanced Sensor and Energy Harvesting Materials
- Optical Polarization and Ellipsometry
- Advanced Chemical Sensor Technologies
- Electrospun Nanofibers in Biomedical Applications
- Healthcare and Environmental Waste Management
National Strategic Research Institute
2020-2024
University of Nebraska Medical Center
2023-2024
Strategic Analysis (United States)
2020-2021
The National Institute for Strategic Studies
2020-2021
Sandia National Laboratories
2005-2014
National Technical Information Service
2005
Office of Scientific and Technical Information
2004-2005
Sandia National Laboratories California
2005
Abstract The novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) originated in Wuhan, China late 2019, and its resulting disease, COVID-19, was declared a pandemic by the World Health Organization on March 11, 2020. rapid global spread of COVID-19 represents perhaps most significant public health emergency century. As progressed, continued paucity evidence routes SARS-CoV-2 transmission has resulted shifting infection prevention control guidelines between classically-defined...
Abstract Lack of evidence on SARS-CoV-2 transmission dynamics has led to shifting isolation guidelines between airborne and droplet precautions. During the initial 13 individuals confirmed positive with COVID-19 infection, air surface samples were collected in eleven rooms examine viral shedding from isolated individuals. While all for SARS-CoV-2, symptoms environment varied considerably. Many commonly used items, toilet facilities, had contamination, indicating that is shed as expired...
The circular intensity differential scattering (CIDS), i.e. the normalized Mueller matrix element -S14/S11, can be used to detect helical structures of DNA molecules in biological systems, however, no CIDS measurement from single particles has been reported date. We report an innovative method for measuring phase functions individually flowing through a laser beam. signals were obtained polystyrene latex (PSL) microspheres with or without coating molecules, tryptophan particles, and...
ABSTRACTWe present an advanced optical method to measure the phase function of circular intensity differential scattering (CIDS), i.e., normalized Mueller matrix element -S14/S11, from individual single flowing through aerosol particles. Here, a 32-anode photomultiplier tube and its associated electronics, combined with elliptical reflector, were used record functions, when particle illuminated by left-handed right-handed polarization laser beam around focus reflector successively. The new...
The COVID-19 pandemic has reintroduced questions regarding the potential risk of SARS-CoV-2 exposure amongst passengers on an aircraft. Quantifying with computational fluid dynamics models or contact tracing methods alone is challenging, as experimental results for inflight biological aerosols lacking. Using fluorescent aerosol tracers and real time optical sensors, coupled DNA-tagged deposition, we executed ground testing Boeing 767 777 airframes. Analysis here represents tracer particles...
Abstract The COVID-19 pandemic has reintroduced questions regarding the potential risk of SARS-CoV-2 exposure amongst passengers on an aircraft. Quantifying with computational fluid dynamics models or contact tracing methods alone is challenging, as experimental results for inflight biological aerosols lacking. Using fluorescent aerosol tracers and real time optical sensors, coupled DNA-tagged deposition, we executed ground testing Boeing 767 777 airframes. Analysis here represents tracer...
The performance of electrostatically charged blown microfiber filter media was characterized for high-volume sampling applications. Pressure drop and aerosol collection efficiency were measured at air pressures 55.2 88.7 kilopascals (kPa) face velocities ranging from 2.5 to 11.25 meters per second (m/s). Particle penetration significant particles above 0.5 micrometers (μm) in aerodynamic diameter where the onset particle rebound observed as low 200 nanometers (nm). retention enhanced by...
This study investigates the effectiveness of electrospun nanofibrous filters in capturing polydisperse virus-containing aerosols and subsequent release viruses, comparison with standard commercial used respirators, military gas masks, devices for airborne virus sampling. We assessed performance these releasing containing MS2 bacteriophage, as well their ability to filter monodisperse dioctyl phthalate measuring 0.185 μm 0.3 diameter. Our findings indicate that provide superior filtration...
There are two predominant methods for understanding and studying bioaerosol aging: capture on microfibers, Goldberg rotating drums. advantages disadvantages to each approach depending the experimental needs, cost, timeline, but they have rarely been compared in parallel determine similarity of results. Experiments that use drums advantage aerosol particles suspension, due time resolution aging processes is limited by chamber volume, sample volumes, loss mechanisms. For microfiber...