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Displaying 1 - 25 of 50

Adaptive Peak Fitting for Isotope Analysis via Atom Probe Mass Spectrometry

July 30, 2021
Author(s)
Frederick Meisenkothen, Daniel Samarov, Mark McLean, Irina Kalish, Eric B. Steel
Atom probe tomography (APT) is an emergent characterization technique that has begun to see widespread use within the last 15 years. The technique offers the highest spatial resolution of any mass spectrometry technique for solid-state specimens, as well

Atom Probe Mass Spectrometry of Uranium Isotopic Reference Materials

July 22, 2020
Author(s)
Frederick Meisenkothen, Mark McLean, Irina Kalish, Daniel V. Samarov, Eric B. Steel
Atom probe tomography (APT) has the highest spatial resolution of any mass spectrometry technique, permitting chemically and isotopically resolved images to be recorded at near-atomic length scales. The technique also has a combined ionization efficiency

Exploring the Accuracy of Isotopic Analyses in Atom Probe Mass Spectrometry

May 21, 2020
Author(s)
Frederick Meisenkothen, Daniel V. Samarov, Irina Kalish, Eric B. Steel
Atom probe tomography (APT) can theoretically deliver accurate chemical and isotopic analyses at a high level of sensitivity, precision, and spatial resolution. However, empirical APT data often contain significant biases that lead to erroneous chemical

Using Replicates in Information Retrieval Evaluation

August 2, 2017
Author(s)
Ellen M. Voorhees, Daniel V. Samarov, Ian M. Soboroff
This paper explores a method for more accurately estimating the main effect of the system in a typical test-collection-based evaluation of information retrieval systems, and thus increasing the sensitivity of system comparisons. Randomly partitioning the

Quantifying Stability of Trace Explosives under Different Environmental Conditions

April 1, 2017
Author(s)
Edward R. Sisco, Marcela N. Najarro, Daniel V. Samarov, Jeffrey A. Lawrence
This work investigates the stability of trace deposits of six explosives (ETN, PETN, RDX, HMX, TNT, and Tetryl) to determine environmental stabilities and lifetimes. Explosives were inkjet printed directly onto PTFE coated fiberglass substrates and exposed

Label-free hyperspectral dark-field microscopy towards quantitative scatter imaging

March 27, 2017
Author(s)
Philip Cheney, David McClatchy III, Stephen Kanick, Paul Lemaillet, David W. Allen, Daniel Samarov, Brian Pogue, Jeeseong C. Hwang
A hyperspectral dark-field microscopy technique has been developed for imaging spatially distributed diffuse reflectance spectra from light-scattering samples. In this report, quantitative scatter spectroscopy was demonstrated with a uniform scattering

PEPR: Pipeline for Evaluating Prokaryotic References

April 1, 2016
Author(s)
Nathanael D. Olson, Justin M. Zook, Daniel V. Samarov, Scott A. Jackson, Marc L. Salit
The rapid adoption of microbial whole genome sequencing in public health, clinical testing, and forensic labo-ratories requires the use of validated and well characterized measurement processes. Reference materials thatare well characterized and

Coexposure to Phytoestrogens and Bisphenol a Mimics Estrogenic Effects in an Additive Manner

November 27, 2013
Author(s)
Anne Katchy, Caroline Pinto, Philip Jonsson, Trang Nguyen-Vu, Marchela Pandelova, Anne Riu, Karl-Werner Schramm, Daniel Samarov, Jan-Ake Gustafsson, Maria Bondesson, Cecilia Williams
Endocrine-disrupting chemicals (EDC) are abundant in our environment. A number of EDCs, including bisphenol A (BPA) can bind to the estrogen receptors, ERα and ERβ, and may contribute to estrogen-linked diseases such as breast cancer. Early-exposure is of

Hospital Readmission by Method of Data Collection

April 11, 2013
Author(s)
Elizabeth M. Hechenbleikner, Martin A. Makary, Daniel Samarov, Jennifer L. Bennett, Susan L. Gearhart, Jonathan E. Efron, Elizabeth C. Wick
Hospital readmissions are increasingly used as a metric of quality with non-payment planned for excess preventable rehospitalizations. Currently, data for pay-for-performance incentives are obtained from administrative sources however this information may