20 research outputs found

    Recurrent and sporadic Forbush decreases during solar cycles 23–24

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    A comparison has been made between recurrent (associated with high-speed streams from coronal holes) and sporadic (caused by interplanetary coronal mass ejections (ICMEs)) Forbush decreases (FDs) in solar cycles 23 and 24 (as well as in the maxima of these cycles and the minimum between them). Forbush Effects and Interplanetary Disturbances database created and maintained in IZMIRAN provided a large number of events (about 1700 isolated FDs, among them 350 recurrent FDs, and 207 sporadic FDs selected with high reliability), which allowed us to apply statistical methods. The results revealed that sporadic FDs prevailed in the maxima of the cycles; recurrent FDs, in the minimum between the cycles. FD parameters (magnitude, decrease rate, anisotropy) are larger for sporadic events than for recurrent ones, especially in the maxima of the cycles. FD magnitude is greater in the maxima than in the minimum for sporadic events, and it changes weakly for recurrent ones. The solar wind velocity is on average greater for recurrent events than for sporadic ones; it is larger for recurrent FDs in the minimum and for sporadic FDs in the maxima. The magnetic field is stronger for sporadic FDs than for recurrent ones in the maxima and it is approximately equal for both types of events in the minimum. The magnetic field of ICMEs is weaker in the current solar cycle than in the previous one. The duration of the FD main phase is less in the maxima for both types of events; sporadic FDs developed significantly faster than recurrent ones in the maximum of cycle 23

    Modulation Effectiveness of Coronal Mass Ejections with Different Structure of the Magnetic Field

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    Abstract: A statistical study of interplanetary disturbances with different positions of the interplanetary magnetic field maximum that generate Forbush decreases is performed. It is shown that the most effective interplanetary disturbances are those with the position of the field maximum 6–15 h after the start of the event. © 2021, Allerton Press, Inc

    КЛИНИЧЕСКИЙ СЛУЧАЙ ЛЕЧЕНИЯ ПАЦИЕНТА ССИНДРОМОМ ДИАБЕТИЧЕСКОЙ СТОПЫ И ПЕРСИСТИРУЮЩЕЙ СЕДАЛИЩНОЙ АРТЕРИЕЙ

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    Persistent sciatic artery (SA) is recognized as a minority variant of embryogenesis of lower limb artery. Article describes a clinical case of complex treatment of a patient with persistent SA, critical ischemia of lower limb and with diabetic foot. The patient underwent diagnostics of lesion, that helped to find out possible ways of disease progression, endovascular revascularization and step-by-step surgery treatment that allowed to keep support function of the limb.Персистирующая седалищная артерия (СА) является редким вариантом развития артерий нижних конечностей. В статье представлен клинический случай комплексного лечения пациента с персистирующей СА, критической ишемией нижней конечности и синдромом диабетической стопы. Пациенту выполнена диагностика поражений, выявившая вариант развития, рентгенэндоваскулярная реваскуляризация и многоэтапное хирургическое лечение ран на стопе, позволившее сохранить опорную функцию конечности

    КЛИНИЧЕСКИЙ СЛУЧАЙ ЛЕЧЕНИЯ ПАЦИЕНТА ССИНДРОМОМ ДИАБЕТИЧЕСКОЙ СТОПЫ И ПЕРСИСТИРУЮЩЕЙ СЕДАЛИЩНОЙ АРТЕРИЕЙ

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    Persistent sciatic artery (SA) is recognized as a minority variant of embryogenesis of lower limb artery. Article describes a clinical case of complex treatment of a patient with persistent SA, critical ischemia of lower limb and with diabetic foot. The patient underwent diagnostics of lesion, that helped to find out possible ways of disease progression, endovascular revascularization and step-by-step surgery treatment that allowed to keep support function of the limb.Персистирующая седалищная артерия (СА) является редким вариантом развития артерий нижних конечностей. В статье представлен клинический случай комплексного лечения пациента с персистирующей СА, критической ишемией нижней конечности и синдромом диабетической стопы. Пациенту выполнена диагностика поражений, выявившая вариант развития, рентгенэндоваскулярная реваскуляризация и многоэтапное хирургическое лечение ран на стопе, позволившее сохранить опорную функцию конечности

    Synthesis of Bisphenol A Based Phosphazene-Containing Epoxy Resin with Reduced Viscosity

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    Phosphazene-containing epoxy oligomers (PEO) were synthesized by the interaction of hexachlorocyclotriphosphazene (HCP), phenol, and bisphenol A in a medium of excess of epichlorohydrin using potassium carbonate and hydroxide as HCl acceptors with the aim of obtaining a product with lower viscosity and higher phosphazene content. PEOs are mixtures of epoxycyclophosphazene (ECP) and a conventional organic epoxy resin based on bisphenol A in an amount controlled by the ratio of the initial mono- and diphenol. According to P-31 NMR spectroscopy, pentasubstituted aryloxycyclotrophosphazene compounds predominate in the ECP composition. The relative content in the ECP radicals of mono- and diphenol was determined by the MALDI-TOF mass spectrometry method. The organic epoxy fraction, according to gas chromatograpy-mass spectrometry (GC-MS), contains 50-70 wt % diglycidyl ether of bisphenol A. PEO resins obtained in the present work have reduced viscosity when compared to other known phosphazene-containging epoxy resins while phosphazene content is still about 50 wt %. Resins with an epoxy number within 12-17 wt %, are cured by conventional curing agents to form compositions with flame-retardant properties, while other characteristics of these compositions are at the level of conventional epoxy materials

    Protection of atmosphere against noxious rolling production ejections

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    Translated from Stal' (1980) (pt.5) p. 396SIGLELD:5828.4F(M--26210) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
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