Galileo and BeiDou AltBOC Signals and Their Perspectives for Ionospheric TEC Studies.

For decades, GNSS code measurements were much noisier than phase ones, limiting their applicability to ionospheric total electron content (TEC) studies. Ultra-wideband AltBOC signals changed the situation. This study revisits the Galileo E5 and BeiDou B2 AltBOC signals and their potential applications in TEC estimation.

Klobuchar, NeQuickG, BDGIM, GLONASS, IRI-2016, IRI-2012, IRI-Plas, NeQuick2, and GEMTEC Ionospheric Models: A Comparison in Total Electron Content and Positioning Domains.

Global navigation satellite systems (GNSS) provide a great data source about the ionosphere state. These data can be used for testing ionosphere models. We studied the performance of nine ionospheric models (Klobuchar, NeQuickG, BDGIM, GLONASS, IRI-2016, IRI-2012, IRI-Plas, NeQuick2, and GEMTEC) both in the total electron content (TEC) domain-i.

GNSS-Based Non-Negative Absolute Ionosphere Total Electron Content, its Spatial Gradients, Time Derivatives and Differential Code Biases: Bounded-Variable Least-Squares and Taylor Series.

Global navigation satellite systems (GNSS) allow estimating total electron content (TEC). However, it is still a problem to calculate absolute ionosphere parameters from GNSS data: negative TEC values could appear, and most of existing algorithms does not enable to estimate TEC spatial gradients and TEC time derivatives. We developed an algorithm to recover the absolute non-negative vertical and slant TEC, its derivatives and its gradients, as well as the GNSS equipment differential code biases (DCBs) by using the Taylor series expansion and bounded-variable least-squares.

[Study of the microbial spectrum of ulcerative-and-necrotic lesions in gerontological patients with lower limb chronic ischaemia].

The present work deals with a comprehensive study of the microbial spectrum of an ischaemic trophic ulcer in gerontological patients with degree IV lower limb chronic ischaemia in order to improve therapeutic outcomes by means of selecting individual antibacterial therapy for a possible prognosis of the results of treatment for an ulcerative-and-necrotic lesion of distal portions of the lower extremities depending on the spectrum of the microflora vegetating in the wound. Based on examining a total of 130 patients aged 70 years and older suffering from lower limb chronic critical ischaemia, we revealed that the pathogen of secondary wound infection isolated in trophic ulcers of the lower extremities influences the total outcomes of surgical management. A conclusion was made on the necessity of a compulsory dynamic scrutiny of the microbial flora of the lower-limb atherosclerotic ulcer, which makes it possible to carefully select individual antibacterial bactericidal therapy with due regard for microbial sensitivity to bactericidal agents.

[Surgical policy in patients aged 70 years and over presenting with grade iv chronic ischaemia of lower limbs].

The present work deals with a currently important problem concerning surgical decision-making in treatment of lower-limb critical ischaemia in elderly and aged people. A total of fifty-three 70-and-more-year-old patients presenting with an ulcerative-and-necrotic lesion of soft tissue of the crus and foot underwent treatment at Hospital of War Veterans No?2. They were subdivided into two groups depending on the level (height) of occlusion, and each of the groups was further subdivided into subgroups of patients subjected to the classical for the given localization of the lesion shunting operations, to compare the latter with less traumatic but at the same time less effective minor and non-anatomical reconstructions.