Comparison of Evolving LIF Emissions of Biological Particles Measured with an SPFS UV APS and WIBS
Abstract not provided.
Publications
Multi-compartment Aerosol Transport Model
A simple aerosol transport model was developed for a multi-compartmented cleanroom. Each compartment was treated as a well-mixed volume with ventilating supply and return air. Gravitational settling, intercompartment transport, and leakage of exterior air into the system were included in the model. A set of first order, coupled, ordinary differential equations was derived from the conservation equations of aerosol mass and air mass. The system of ODEs was then solved in MATLAB using pre-existing numerical methods. The model was verified against cases of (1) constant inlet-duct concentration, and (2) exponentially decaying inlet-duct concentration. Numerical methods resulted in normalized error of less than 10 -9 when model solutions were compared to analytical solutions. The model was validated against experimental measurements from a single field test and showed good agreement in the shape and magnitude of the aerosol concentration profile with time.
Changes in the single particle fluorescence of biological particles exposed to outdoor environments and the its relationship to the atmospheric chemistry
Abstract not provided.
Bioaerosol Measurement Sampling and Analysis
Abstract not provided.
Changes in the Detectability and Viability of Aged Biological Particles
Abstract not provided.
Measurements of changes in the fluorescence and viability of biological particles exposed to outdoor conditions outside of Houston TX
Abstract not provided.
A laboratory exposure system to study the effects of aging on super-micron aerosol particles
A laboratory system was constructed that allows the super-micron particles to be aged for long periods of time under conditions that can simulate a range of natural environments and conditions, including relative humidity, oxidizing chemicals, organics and simulated solar radiation. Two proof-of-concept experiments using a non-biological simulant for biological particles and a biological simulant demonstrate the utility of these types of aging experiments. Green Visolite®, which is often used as a tracer material for model validation experiments, does not degrade with exposure to simulated solar radiation, the actual biological material does. This would indicate that Visolite® should be a good tracer compound for mapping the extent of a biological release using fluorescence as an indicator, but that it should not be used to simulate the decay of a biological particle when exposed to sunlight. The decay in the fluorescence measured for B. thurengiensis is similar to what has been previously observed in outdoor environments.
Fluorescence of bioaerosols: mathematical model including primary fluorescing and absorbing molecules in bacteria
Optics Express
Abstract not provided.
Relationship between meteorological variables total ambient aerosol concentration and biologically fluorescent aerosol concentrations
Proposed for publication in Atmospheric Environment.
Abstract not provided.
A short-standoff bistatic lidar system for aerosol cloud backscatter cross section measurement
CLEO: Applications and Technology, CLEO_AT 2012
A short-standoff bistatic lidar system coupled with an aerosol chamber has been built to measure aerosol optical backscatter and laser induced fluorescence cross-sections. Preliminary results show good sensitivity across all channels with high signal-to-noise ratio. © OSA 2012.
A New Optical Chamber for the Measurement of Aerosol Cross Sections under Controlled Conditions
Abstract not provided.
11 Results