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Displaying 26 - 50 of 2777

Origin of the voltage gap and recombination losses in all-perovskite tandem solar cells

March 19, 2026
Author(s)
Hurriyet Yuce Cakir, John Roller, Haoran Chen, Tingting Zhu, Susanna Thon, Yanfa Yan, Zhaoning Song, Behrang Hamadani
All-perovskite tandem solar cells with narrow and wide bandgap perovskite absorbers are promising candidates for low-cost and high efficiency photovoltaic applications. However, the open circuit voltage of typical tandem structures is generally smaller

Accurate Volume Determination for Low Gas Flow Standards

March 17, 2026
Author(s)
Jodie Pope, Christopher Crowley, Max Low, John Wright, Aaron Johnson
The National Institute of Standards and Technology (NIST) has developed the Semiconductor Low Flow Standard (SLowFlowS), a new rate-of-rise (RoR) gas flow standard capable of measuring flows as low as 0.01 standard cm³/min. SLowFlowS incorporates two

Result harmonization in medical laboratories: accomplishments and challenges.

March 13, 2026
Author(s)
Tony Badrick, Ralf D. Josephs, Liesbet Deprez, Christa Cobbaert, VINCENT DELATOUR, Christian Vogl, Katleen Van Uytfanghe, Ashley Green, Sverre Sandberg
The Joint Committee for Traceability in Laboratory Medicine was established in 2002 in response to the implementation of the European Community Directive 98.79/EC on in vitro medical devices. The Committee consisted of representatives from the

Advancing evanescent light scattering microscopy for single-particle characterization of gene delivery nanoparticles

March 4, 2026
Author(s)
Jagat Budhathoki, Gregory Cooksey, Matthew DiSalvo, Thomas Germer, Peter Bajcsy, Edward Kwee, Aaron Goldfain, Alexander Peterson
Precise and reproducible single-nanoparticle characterization is essential for advancing gene therapy, where viral vectors encapsulating therapeutic genes must be evaluated under formulation-relevant conditions. We present a label-free optical platform

2025 NIST Summary of U.S. Legal Metrology Activities

February 17, 2026
Author(s)
Loren Minnich, Gloria Lee, John McGuire, Jan Konijnenburg, Isabel Baucom, Juana Williams, Katrice Lippa, David Sefcik
The NIST Office of Weights and Measures (OWM) presents its second issue of the 2024 NIST Annual Summary of U.S. Legal Metrology Activities report. This report includes a summary of changes made to NIST Handbook 44 (2026) Specifications, Tolerances and

Comparison of Electroluminescence and Photoluminescence Imaging of Mixed-Cation Mixed-Halide Perovskite Solar Cells at Low Temperatures

February 16, 2026
Author(s)
Hurriyet Yuce Cakir, Haoran Chen, Isaac Ogunniranye, Susanna Thon, Yanfa Yan, Zhaoning Song, Behrang Hamadani
Mixed-cation mixed-halide perovskites have emerged as promising candidates for high-performance solar cells. This study investigates the temperature-dependent optoelectronic properties of Rb0.05Cs0.05MA0.05FA0.85Pb(I0.95Br0.05)3 perovskite solar cells

NIST Handbook 44: Specifications, Tolerances and Other Technical Requirements for Weighing and Measuring Devices (2026 Ed.)

January 5, 2026
Author(s)
Loren Minnich, Gloria Lee, Juana Williams, Isabel Baucom, Jan Konijnenburg, John McGuire, Katrice Lippa
NIST Handbook 44 includes specifications, tolerances, and other technical requirements for weighing and measuring devices. These requirements are intended to encourage the design, installation, testing, and use of weighing and measuring devices that

NIST Handbook 133: Checking the Net Contents of Packaged Goods (2026 Ed.)

December 29, 2025
Author(s)
John McGuire, David Sefcik, Loren Minnich, Elizabeth Benham, Isabel Baucom, Katrice Lippa
This handbook has been prepared as a procedural guide for the compliance testing of net content statements on packaged goods. Compliance testing of packaged goods is the determination of the conformance results of packaging, distribution, and sale of

Chirped magneto-optical trap of molybdenum

December 12, 2025
Author(s)
Sai Naga Manoj Paladugu, Nickolas Pilgram, Stephen Eckel, Eric Norrgard
We have directly loaded a cryogenic beam of molybdenum atoms into a magneto-optical trap. By chirping the detuning of the trapping lasers, we were able to enhance the number of atoms loaded into the trap by more than a factor of 2. We optimize the trapped

Environmental Measurements: A Needs Assessment

November 19, 2025
Author(s)
Julia Marrs, David Allen, Gerald Fraser
A summary is provided of the presentations, discussion, and findings from a two-and-a-half-day workshop on environmental measurements focusing on needs for new measurement science and measurement standards to support the characterization of ecological

Relating Human and AI-based Detection Limits in SEM Dimensional Metrology

October 25, 2025
Author(s)
Peter Bajcsy, Pushkar Sathe, Andras Vladar
Background: The nanoscale measurements of critical dimensions in semiconductor manufacturing rely on scanning electron microscopy (SEM) and SEM image analyses. The acquisition of SEM images requires a low primary electron beam current and a low dose of the
Displaying 26 - 50 of 2777
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