Imaging device to measure the reflective and transmissive part of isotropic BSSRDF.

The bidirectional scattering-surface reflectance distribution function (BSSRDF) is a fundamental scattering quantity that characterizes the appearance of translucent materials. The few existing BSSRDF measurement facilities that ensure traceable results have shown the high complexity of such measurement, while only accounting for light scattered in the reflection hemisphere. We have developed an imaging device for measuring both the reflective and the transmissive part of the spectral BSSRDF.

Substance use disorder of equimolar oxygen-nitrous oxide mixture in French sickle-cell patients: results of the PHEDRE study.

Background: In many countries, nitrous oxide is used in a gas mixture (EMONO) for short-term analgesia. Cases of addiction, with significant misuse, have been reported in hospitalized patients. Patients suffering from sickle cell disease (SCD) could represent a high-risk population for substance use disorder (SUD) due to their significant pain crisis and repeated use of EMONO.

"Naloxone? Not for me!" First cross-assessment by patients and healthcare professionals of the risk of opioid overdose.

Background: Opioid-related mortality is a rising public health concern in France, where opioids were in 2021 implicated in 75% of overdose deaths. Opioid substitution treatment (OST) was implicated in almost half of deaths related to substance and drug abuse. Although naloxone could prevent 80% of these deaths, there are a number of barriers to the distribution of take-home naloxone (THN) among opioid users in France.

Dry powders reflectance model based on enhanced backscattering: case of hematiteα-FeO.

By performing bidirectionnal reflectance distribution function (BRDF) measurements, we have identified backscattering as the main phenomenon involved in the appearance of dry nanocrystallized powders. We introduce an analytical and physically based BRDF model that relies on the enhanced backscattering theory to accurately reproduce BRDF measurements. These experimental data were performed on optically thick layers of dry powders with various grains' morphologies.