Operação "Lúmen". Quatro detidos em esquema criminoso para iluminações festivas

A Polícia Judiciária, através da Diretoria do Norte, realizou uma operação policial no âmbito da criminalidade económico-financeira, na qual foram detidas quatro pessoas, suspeitas da autoria dos crimes corrupção ativa e passiva, participação económica em negócio, abuso de poder e associação criminosa, relacionados com o fornecimento e instalação de iluminações festivas.

Manifesto: Cientistas contra a Guerra. Pela Paz, a Cooperação e o Desenvolvimento – OTC

Changes in the spectrum of artificial light as it propagates from the sources to ground-based and satellite detectors

The spectral composition of light is a key factor for understanding its visual and non-visual effects, and for evaluating its ecological impacts. Considerable attention has been paid in the last years to the spectral characteristics of different lighting technologies. The spectrum of the light emitted by a lamp, however, may suffer significant changes along the path from the source to the observer. Some of these changes take place abruptly, for instance in reflections, others in a smoother way, like those progressively accumulated during propagation, and all of them contribute to shaping the actual light spectra at different distances from the source. This note briefly recalls the basic physical processes causing these changes and shows some examples of the expected evolution of several indicators, such as the correlated color temperature (CCT), the U500, the radiance per lumen below 500 nm, the RGB components, and the CIE xy coordinates. Three scenarios are considered: a ground based observer monitoring the zenith sky brightness, an observer measuring the direct radiance of the lamps along an horizontal path, and the nighttime lights measured by a satellite in Earth orbit. Awareness of these changes may contribute to a better assessment of the detrimental effects of artificial light in the nocturnal environment.

IUS Condemns US-Israeli Military Aggression Against Iran

We, in the International Union of Scientists (IUS), strongly and unequivocally condemn the wanton military attack on Iran by the USA and its Israeli accomplice, carried out under the pretext of a “preventive” strike, at a time when active negotiations were going on between Iran and the USA for a

We Will Not Be Divided

Employees of Google and OpenAI stand together to refuse the Department of War's demands to use AI models for domestic mass surveillance and autonomous killing without human oversight.