Results 161 to 170 of about 277,414 (304)

Problem proposal JP.090.

open access: yes, 2017
Inequality for the cosines and sines in a triangle is given.
openaire   +1 more source

New Magnetite Reference Material for SIMS δ18O Measurements and a Study of Precision and Accuracy Due to Crystal Orientation Effects

open access: yesGeostandards and Geoanalytical Research, EarlyView.
Key Points A new magnetite reference material (PF21mt) is available for δ18O measurements by SIMS. Reproducibility of measurement results in two laboratories suggest orientation bias of ±2‰ (2s) at 20 keV. Repeatability improves to ±1‰ (2s) when using a 13 keV protocol, suggesting reduced orientation bias. In situ isotope ratio measurements provide the
Michelle Ulrich   +4 more
wiley   +1 more source

Hierarchical analysis of unsuccessful tuberculosis treatment among people living with HIV in Brazil using nationwide surveillance data

open access: yesHIV Medicine, EarlyView.
Abstract Introduction People with tuberculosis‐HIV coinfection face multiple barriers to effective treatment, including social vulnerability, stigma and limited access to healthcare. This study examined factors associated with loss to follow‐up and death among individuals with tuberculosis‐HIV in Brazil.
Lucas Vinícius de Lima   +9 more
wiley   +1 more source

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