Space-time transformation sky brightness at a horizontal position of the sun

This report discusses some simulation results of the angular distribution of brightness of the sky in the case of molecular scattering in the atmosphere for the benefit of the study of space-time changes of this distribution during the civil twilight

The formation of the sky brightness with horizon position of the sun

This report discusses some simulation results of the angular distribution of brightness of the sky in the case of molecular scattering in the atmosphere during the civil twilight with solar zenith angles 90 ° - 94 °

Cloud elements detection on the panoramic images of the sky

The paper gives a short overview of methods of cloud detection and sky cloud cover level determination based on panoramic sky images obtained with the wide angle lenses of type «Fisheye»

Image processing of cloud fields based on satellite data

The method is considered of determining the direction of movement of cloud fields based on a series of images of clouds received from open sources

Comparative Evaluation of Custom-Made Components and Standard Implants for Acetabular Reconstruction in Revision Total Hip Arthroplasty

Background.The use of custom-made acetabular components is one of the promising methods for reconstruction of the acetabulum in cases of significant defects, including those associated with pelvic bone dissociation. It allows achieving stable fixation and restoring the biomechanics of the hip joint. Aimofthestudy to compare the results of using individually designed components, supportive antiprotrusion rings, augments, and hemispherical components in revision total hip arthroplasty for type IIIB bone defects according to Paprosky classification. Methods.The study analyzed the treatment outcomes of 90 patients with type IIIB bone defects who underwent revision total hip arthroplasty between 2017 and 2022. Patients were divided into three groups: the first group received individually designed acetabular components, the second group received augments with hemispheres, and the third group had antiprotrusion cages implanted. The analysis included the reasons for revision surgery, operation duration, blood loss volume, and type of revision procedure. Pain and functional outcomes were assessed with WOMAC, Harris Hip Score, and VAS scales. Results.3D-printed constructs were more frequently implanted in patients with pelvic bone dissociation. The first group showed a significantly positive dynamic in functional outcomes. Complications were diagnosed in 27 (30%) cases: joint instability (dislocation) in 10 (11.1%) patients, periprosthetic infection in 8 (8.8%), aseptic loosening in 4 (4.4%), and sciatic nerve neuropathy in 5 (5.5%) patients. The number of these complications was higher in the second and third groups of patients. Conclusion.Custom-made implants using 3D technologies are a preferable option for revision total hip arthroplasty in patients with type IIIB defects according to Paprosky classification, especially in cases of pelvic bone dissociation

Cloud elements detection on the panoramic images of the sky

The paper gives a short overview of methods of cloud detection and sky cloud cover level determination based on panoramic sky images obtained with the wide angle lenses of type «Fisheye»

Space-time transformation sky brightness at a horizontal position of the sun

This report discusses some simulation results of the angular distribution of brightness of the sky in the case of molecular scattering in the atmosphere for the benefit of the study of space-time changes of this distribution during the civil twilight

The formation of the sky brightness with horizon position of the sun

This report discusses some simulation results of the angular distribution of brightness of the sky in the case of molecular scattering in the atmosphere during the civil twilight with solar zenith angles 90 ° - 94 °

Image processing of cloud fields based on satellite data

The method is considered of determining the direction of movement of cloud fields based on a series of images of clouds received from open sources

The phenomenon of atmospheric mirror reflection

Consideration of the results of the interaction of electromagnetic radiation with non-spherical atmospheric particles with anisotropic properties is of both scientific and practical interest. Particular attention should be paid to the interaction of directed optical radiation with spatially oriented atmospheric ice crystals. Failure to take into account the mirror image of optical radiation from an ensemble of spatially oriented atmospheric particles of non-spherical shape can distort model representations, significantly complicate the interpretation of the results obtained and lead to incorrect interpretation of some phenomena observed in the atmosphere. The paper considers some results of observations of the phenomenon of mirror reflection from horizontally-oriented flat crystal parts localized in the atmosphere. This study was supported by the Ministry of Science and Higher Education of the Russian Federation