Results 161 to 170 of about 2,426,974 (209)

Detection Limit of Isotope Dilution Mass Spectrometry

Analytical Chemistry, 2002
The detection limit is an important figure of merit for evaluating instrumentation and analytical methods. While the detection limit for techniques using linear calibration functions has been studied extensively, this fundamental metric has rarely been discussed for mass spectrometry that bases the calibration on the principle of isotope dilution.
Lee L, Yu, John D, Fassett, William F, Guthrie   +2 more
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Limit of blank, limit of detection and limit of quantitation.

The Clinical biochemist. Reviews, 2010
* Limit of Blank (LoB), Limit of Detection (LoD), and Limit of Quantitation (LoQ) are terms used to describe the smallest concentration of a measurand that can be reliably measured by an analytical procedure. * LoB is the highest apparent analyte concentration expected to be found when replicates of a blank sample containing no analyte are tested. LoB =
David A, Armbruster, Terry, Pry
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The Joint Consequence of Detection Limit Censoring and Detection Limit Determination Uncertainty

Journal of Testing and Evaluation
ABSTRACT Method detection limits estimated from specialized data studies are frequently used as a basis for left censoring reported data. Estimated method detection limits are frequently impacted by the failure to fully mimic all measurement system characteristics represented in process quality data collection.
Thomas J. Bzik, Suhas N. Ketkar
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Limitations of Polybrene to Detect ABO Incompatibility

Vox Sanguinis, 1986
Abstract. The ability of the manual Polybrene™ test to detect ABO incompatibility was assessed since the anti‐human globulin phase of the crossmatch is no longer mandated under many circumstances by the Standards of the American Association of Blood Banks, while the ability of the crossmatch to detect ABO incompatibility remains a requirement.
P D, Mintz, G, Anderson
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Quantum limited heterodyne detection of spin noise

Review of Scientific Instruments, 2016
Spin noise spectroscopy is a powerful technique for studying spin relaxation in semiconductors. In this article, we propose an extension of this technique based on optical heterodyne detection of spin noise, which provides several key advantages compared to conventional spin noise spectroscopy: detection of high frequency spin noise not limited by ...
Cronenberger, Steeve, Scalbert, Denis
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Detectability of two-dimensional band limited noise

Vision Research, 1974
The detectability of two-dimensional gaussian noise of limited spatial frequency content has been measured for several centre frequencies. These measurements are compared with measurements of the thresholds for the detection of spatial sine waves.
Koenderink, J J, van Doorn, A J
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Electrostatic Limit of Detection of Nanowire‐Based Sensors

Small, 2015
Scanning gate microscopy is used to determine the electrostatic limit of detection (LOD) of a nanowire (NW) based chemical sensor with a precision of sub‐elementary charge. The presented method is validated with an electrostatically formed NW whose active area and shape are tunable by biasing a multiple gate field‐effect transistor (FET).
Alex, Henning, Michel, Molotskii, Nandhini, Swaminathan, Yonathan, Vaknin, Andrey, Godkin, Gil, Shalev, Yossi, Rosenwaks   +6 more
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Statistical properties of limit of detection test statistics

Talanta, 2003
There are a number of possible ways to define the instrumental limit of detection (LOD) figure of merit and in the present work we define four such sample test statistics and derive their probability density functions (PDFs). Although the derived PDFs were found to be irreducible integrals, they are easily evaluated via numerical integration and can be
Montville, D, Voigtman, E
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Handling the limit of detection by extrapolation

Statistics in Medicine, 2012
A general method of estimation with a variable observed subject to a limit of detection is introduced. It is based on extrapolation of the estimates obtained by increasing the limit of detection. Theoretical arguments support the method in some special cases, and it is explored by simulations.
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Nondetects, Detection Limits, and the Probability of Detection

Journal of the American Statistical Association, 1991
Abstract When chemists cannot quantify the concentration in a field sample, they report nondetect instead of a numerical measurement. A data analyst faced with environmental data containing nondetects might assume that all nondetects are zeros, all nondetects are smaller than the smallest detect (numerical measurement), or, if a detection limit is ...
Diane Lambert, Bruce Peterson, Irma Terpenning   +2 more
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