The first photometric analysis of two low mass ratio totally eclipsing contact binaries: TIC 393943031 and TIC 89428764

PhotometricanalysisofthecontactbinariesTIC393943031andTIC89428764was carried out usingTESS and SuperWASP data for the first time. Using Wilson-Devinneycode, we have discovered TIC 393943031 is a low-mass-ratio deep contact binary with a fillout factor of 50.9(±1)% and a mass ratio of q = 0.163 ± 0.001. TIC 89428764 is a medium and low-mass-ratio contact binary with a fillout factor of 34.5(±1)% and a mass ratio of q = 0.147±0.001. Furthermore, the period study reveals both the stars exhibit continuously increasing periods, the increasing rate is 4.21×10−7day ·year−1for TIC 393943031while 6.36 × 10−7day · year−1for TIC 89428764. The possible reason is mass transfer from the secondary component to the primary component for both the stars. Meanwhile, we discussed their evolutionary phases and orbital angular momenta.

THE LIGHT OF AMAZON ARCHITECT SEVERIANO MÁRIO PORTO

The use of passive techniques in architecture is welcome. A renowned Brazilian architect, Severiano Mário Porto, developed over 200 projects and became an icon of Brazilian modernism, specifically in the Amazon, working with this prerogative. This work aims to combine the analysis of the lighting quality in Severiano's projects, corroborating the recognized fame of the "Architect of the Amazon". The research procedures adopted were: documentary survey, selection of case studies, application of a monitoring protocol with photometric analysis and user consultation, and daylight computer simulation. In terms of daylighting, when applied the monitoring protocol on the current state of the building, the lighting values are not satisfactory according to Brazilian standards. As the view outside, the results showed medium and high quality. The questionnaires point to high levels of satisfaction. The computer simulations show the daylighting potential of the original design. There is clear evidence that the actual condition wastes the potential of the original design in terms of daylight use.

Evaluation of Photosensitive Paper Coatings as Detectors for Instrumentation-Free UV Photometric Analysis Based on Photography-Based Photometry

Photography-based photometry is a technique developed to perform high throughput UV photometric analysis without instrumental detectors in resource-limited settings. Its principle relies on the illumination of a sample with UV irradiation and then capturing the transmitted irradiation on a photosensitive paper surface. Therefore, the photosensitive surface acts as a detector for the determination of the concentration of analytes in the sample. This work aims to investigate the optimum photosensitive paper coatings for capturing the transmitted UV irradiation. To this end, photosensitive coatings based on silver, iron, and dichromate salts were tested using three assays of pharmaceutical and biochemical interest. The results from both calibrations, using standard solutions and the application in real samples, show that photosensitive coatings based on iron salts provide the best results. Importantly, the detection limits and the linear range of the calibration curves were better than those obtained with standard photometry. Based on these findings, cyanotype green papers, are proposed as optimum detectors for photography-based photometry. This finding simplifies the operation of the technique enabling the fabrication of prototype readers for analytical assays performed in resource limited settings, point-of-need applications or in the field.