Christopher J. Hogan
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View article: Development and characterization of a multi-phase flow supersonic wind tunnel
Development and characterization of a multi-phase flow supersonic wind tunnel Open
We describe a newly commissioned Ludwieg-tube facility at the University of Maryland, capable of producing high-speed multi-phase flows. The wind tunnel is operational at Mach 3.75–4 for unit Reynolds numbers spanning $$\sim$$ 2.5 $$\tim…
View article: The origin of complex crater formation during high-speed impacts
The origin of complex crater formation during high-speed impacts Open
Complex crater formation is an incompletely understood phenomenon, referring to instances wherein a high-speed projectile impacts a surface and leaves a crater characterized by a central uplift. We elucidate the mechanism of complex crater…
View article: Development and Characterization of a Multi-Phase Flow Supersonic Wind Tunnel
Development and Characterization of a Multi-Phase Flow Supersonic Wind Tunnel Open
We describe a newly commissioned Ludwieg-tube facility at the University of Maryland, capable of producing high-speed multi-phase flows. The wind tunnel is operational at Mach 3.75-4 for unit Reynolds numbers spanning ∼2.5×106 m−1 to ∼24×1…
View article: Aerodynamic Size-Dependent Collection and Inactivation of Virus-Laden Aerosol Particles in an Electrostatic Precipitator
Aerodynamic Size-Dependent Collection and Inactivation of Virus-Laden Aerosol Particles in an Electrostatic Precipitator Open
Electrostatic precipitators (ESPs) may enable high particle collection efficiency with minimal pressure drop in HVAC systems. However, studies of pathogen collection and inactivation in ESPs at medium to higher flow rates are limited. Here…
View article: Evaluation of coating materials on the characterization of size and viability of virus-laden particles collected with an Andersen cascade impactor
Evaluation of coating materials on the characterization of size and viability of virus-laden particles collected with an Andersen cascade impactor Open
Airborne pathogens are typically associated with particles, and the transport behavior of these particles is largely driven by their size. To better understand airborne transmission of viral diseases and develop effective control measures,…
View article: Effect of multifunctional cationic polymer coatings on mitigation of broad microbial pathogens
Effect of multifunctional cationic polymer coatings on mitigation of broad microbial pathogens Open
Infection control measures to prevent viral and bacterial infection spread are critical to maintaining a healthy environment. Pathogens such as viruses and pyogenic bacteria can cause infectious complications. Viruses such as SARS-CoV-2 ar…
View article: Board 18: Work in Progress: The ATP-Bio REU Boot Camp: An Innovative Approach to Building a Sense of Community in Support of Broadening Participation in Biomedical Engineering
Board 18: Work in Progress: The ATP-Bio REU Boot Camp: An Innovative Approach to Building a Sense of Community in Support of Broadening Participation in Biomedical Engineering Open
National studies indicate that Black and Latinx students declare Science, Technology, Engineering, and Math (STEM) majors at the same rate as their white peers, yet STEM degree completion rates for these students fall far below those of th…
View article: Real-time Geoinformation Systems to Improve the Quality, Scalability, and Cost of Internet of Things for Agri-environment Research
Real-time Geoinformation Systems to Improve the Quality, Scalability, and Cost of Internet of Things for Agri-environment Research Open
With the increasing emphasis on machine learning and artificial intelligence to drive knowledge discovery in the agricultural sciences, spatial internet of things (IoT) technologies have become increasingly important for collecting real-ti…
View article: Inhaled fosamprenavir for laryngopharyngeal reflux: Toxicology and fluid dynamics modeling
Inhaled fosamprenavir for laryngopharyngeal reflux: Toxicology and fluid dynamics modeling Open
Objectives Approximately 25% of Americans suffer from laryngopharyngeal reflux (LPR), a disease for which no effective medical therapy exists. Pepsin is a predominant source of damage during LPR and a key therapeutic target. Fosamprenavir …
View article: P404 Monocyte distribution width differentiates bacterial gastroenteritis from Acute Severe Ulcerative Colitis in patients presenting with diarrhoea
P404 Monocyte distribution width differentiates bacterial gastroenteritis from Acute Severe Ulcerative Colitis in patients presenting with diarrhoea Open
Background Monocyte distribution width (MDW) is a haematological parameter that can be generated by newer generation blood analysers on routine full blood examination. It reflects the variation in the size of monocytes and is elevated in t…
View article: Control technologies to prevent aerosol-based disease transmission in animal agriculture production settings: a review of established and emerging approaches
Control technologies to prevent aerosol-based disease transmission in animal agriculture production settings: a review of established and emerging approaches Open
Transmission of infectious agents via aerosols is an ever-present concern in animal agriculture production settings, as the aerosol route to disease transmission can lead to difficult-to-control and costly diseases, such as porcine respira…
View article: Visualization and Characterization of Agricultural Sprays Using Machine Learning based Digital Inline Holography
Visualization and Characterization of Agricultural Sprays Using Machine Learning based Digital Inline Holography Open
Accurate characterization of agricultural sprays is crucial to predict in field performance of liquid applied crop protection products. Here we introduce a robust and efficient machine learning (ML) based Digital In-line Holography (DIH) t…
View article: Effects of portable air filtration on submicrometer- and micrometer-sized particle deposition and concentration in a natural ventilated skilled nursing facility
Effects of portable air filtration on submicrometer- and micrometer-sized particle deposition and concentration in a natural ventilated skilled nursing facility Open
Older adults are highly vulnerable to respiratory diseases. Effective engineering controls are critical to reduce transmission risk via airborne particles, particularly in spaces where older adults reside (e.g., skilled nursing facilities;…
View article: Collaborative Research: Understanding Nanoparticle-Plasma Interactions in Dusty Non-Thermal Plasmas by Nanoparticle Probes and Online Aerosol Characterization
Collaborative Research: Understanding Nanoparticle-Plasma Interactions in Dusty Non-Thermal Plasmas by Nanoparticle Probes and Online Aerosol Characterization Open
Research Objectives The goal of this research project is to understand the nature of charge interactions between plasmas and aerosol particles. Specifically, the project has the following objectives: 1) Study the effect of solid nanopartic…
View article: Electrospray ionizer for mass spectrometry of aerosol particles
Electrospray ionizer for mass spectrometry of aerosol particles Open
A device and method are disclosed to apply ESI-based mass spectroscopy to submicrometer and nanometer scale aerosol particles. Unipolar ionization is utilized to charge the particles in order to collect them electrostatically on the tip of…
View article: Implications of worsening renal function before hospitalization for acute heart failure
Implications of worsening renal function before hospitalization for acute heart failure Open
Aims Kidney function changes dynamically during AHF treatment, but risk factors for and consequences of worsening renal function (WRF) at hospital admission are uncertain. We aimed to determine the significance of WRF at admission for acut…