A novel active personal nanoparticle sampler (PENS), which enables the collection of both respirable particulate mass (RPM) and nanoparticles (NPs) simultaneously, was developed to meet the critical demand for personal sampling of engineered nanomaterials (ENMs) in workplaces. The PENS consists of a respirable cyclone and a micro-orifice impactor with the cutoff aerodynamic diameter (d(pa50)) o...

The Moon possesses strong magnetic anomalies that are enigmatic given the weak magnetism of lunar rocks. We show that the most prominent grouping of anomalies can be explained by highly magnetic extralunar materials from the projectile that formed the largest and oldest impact crater on the Moon: the South Pole-Aitken basin. The distribution of projectile materials from a model oblique impact c...

Introduction: Striking, mass-independent oxygen [1], chromium [2], and tungsten [3] isotopic similarities between the Earth's mantle and the Moon, which are readily distinguished from most other Solar System materials, provide a critical but troublesome test for models of lunar formation. In the context of the giant impact theory, the leading hypothesis for the origin of the Moon [e.g., 4, 5], ...

Recommended Citation Ellickson, Daniel Emick. "Assessment of microscopy methods for distinguishing engineered nanoparticles from incidental nanoparticles." MS O'Shaughnessy for all of his guidance preparing for this project. I would also like to thank Dr. Peters for the use of his laboratory equipment, Jonas Baltrusaitis for microscopy training and advice, and the Heartland Center for financial...

Attempts were made to measure the fraction of elemental carbon (EC) in ultrafine aerosol by modifying an Ambient Carbonaceous Particulate Monitor (ACPM, R&P 5400). The main modification consisted in placing a quartz filter in one of the sampling lines of this dual-channel instrument. With the filter all aerosol and EC contained in it is collected, while in the other line of the instrument the s...

OBJECTIVES To date, the scientific source materials usually focus on microbial contamination of the museum or library collections themselves, while the exposure of persons who professionally deal with this type of objects in cultural heritage conservation laboratories is ignored. MATERIAL AND METHODS The study was carried out in 9 naturally ventilated conservation laboratories with no history...

This paper highlights advantages and drawbacks due to the use of portable low-cost devices for aerosol sampling, showing their performances during an monitoring campaign with parallel gravimetric sampling reference method a cascade impactor. A specific was held running all instruments in indoor, confined, outdoor environments characterized by local emission sources or particulate matter backgro...

fiber/ metal laminates (fmls) are hybrid composites consisting of alternating thin layers of metal sheets and fiber reinforced epoxy laminates. in this study, the effect of fiber orientation on impact properties of fml plates is investigated both analytically and experimentally. two groups of specimens were prepared and tested in two different levels of impactor energy. the indentation depth an...

A set of 50,000 artificial Earth impacting asteroids was used to obtain, for the first time, information about the dominance of individual impact effects such as wind blast, overpressure shock, thermal radiation, cratering, seismic shaking, ejecta deposition, and tsunami for the loss of human life during an impact event for impactor sizes between 15 and 400m and how the dominance of impact effe...

The response over the low-velocity impact of various shape impactors on a glass fiber reinforced polymer composite has been numerically analyzed with hemispherical, flat, partially flat and truncated shaped impactor used to analyze behavior resistance GFRP at speeds. numerical analysis was carried out using finite element software, ABAQUS (Dynamic/Explicit). To assess laminates while impacting,...