Modulation of gyrosynchrotron emission in solar and stellar flares by slow magnetoacoustic oscillations

Gyrosynchrotron emission generated by non-thermal electrons in solar and stellar coronal flares can be efficiently modulated by slow magnetoacoustic oscillations in the flaring loops. The modulation mechanism is based upon perturbation of the efficiency in the Razin suppression of optically thin gyrosynchrotron emission. Modulation of the emission is in anti-phase with the density perturbation in the slow wave. The observed emission modulation depth can be up to an order of magnitude higher than the slow wave amplitude. This effect is more pronounced at lower frequencies. Observations with spatial resolution, together with analysis of the modulation frequency, are shown to be sufficient for providing the information needed to identify the mode

Functional State of the Microvascular Bed of the Skin in Essential Arterial Hypertension Assessed by Laser Doppler Flowmetry with Amplitude-Frequency Wavelet Analysis of Blood Flow Oscillations

Modern diagnostic technologies provide access to data which until recently were not available to specialists. Laser Doppler flowmetry (LDF) with amplitude-frequency wavelet analysis of tissue perfusion oscillations in patients with essential arterial hypertension (AH) revealed two completely opposite functional states of resistive precapillary arterioles. One group of patients (48%) had a significant increase in the sympathetic vascular tone component and vasomotor microvascular endothelial dysfunction (precapillary resistance). The second group of patients (52%), on the contrary, exhibited a significant reduction in myogenic tone accompanied by raised arterial blood inflow and increased blood filling of the venular microcirculatory bloodstream (postcapillary resistance). Since the main target of most pharmaceuticals is the resistive vessels, LDF can be useful for the selection of personalized antihypertensive therapy that considers the functional state of resistive microvessels

Note and Picture of Aleksei Fedorovich with his father (see translation)

Picture of Aleksei Fedorovich with his father, inscription in back: This is me with my Dad on my birthday the 15th of September.https://dh.howard.edu/probeson_russia/1001/thumbnail.jp

Modified Byproduct of Coke Phenols as Effective and Prospective Inhibitors for Petrochemical Industry

Experimental author results on the use of technogenic phenols as inhibitors are presented to undesirable polymerization in petrochemical manufactures. The basic ways of increase inhibiting properties of coke-chemical phenols are shown, such as rectification for separation of two-nuclear derivatives or some examples of their chemical modification, allowing to increase the inhibiting efficiency of phenolic mixes, for example, by novolak fenol-formaldehyde condensation or oxidative coupling reactions. The received derivatives of phenols are recommended both for processing pyrocondensates and for rectification of styrene

Administrative and economic dimensions of regionalization: case of Leningrad Province and North-Western Federal District of Russia

The North-Western Federal District (NWFD) was created in 2000 within the framework of administrative and territorial division reforming. NWFD appeared together with 6 other districts: Central, Privolzhski, Southern, Urals?, Siberian and Far Eastern. The District included 2 economic regions: North-Western and Northern and united 11 Federation Units: Kaliningrad, Leningrad, Pskov, Novgorod, Vologda, Murmansk and Arkhangelsk provinces, Karelia and Komi Republics, Nenets Autonomous District and Saint-Petersburg._ According to many indicators North-West Federal District of Russia is a leader of NWFD, leaving behind even Saint-Petersburg (if we compare investment attractiveness, especially for FDI, both domestic and foreign). During 1999 ? 2000 several big investment projects started in the Province. The Province?s only real competitor among NWFD regions is Novgorod region which also formed an ?oasis? of favorable investment climate within its boundaries._ Economic and geographical significance of Leningrad Province for NWFD and whole Russia is based on transport infrastructure, which develops actively on its territory. The infrastructure includes seaports and railroads that serve as transit bridges between Russia and European countries. That was the reason for the Province?s participation in main investment projects in NWFD implemented during the last years, such as creation of Baltic Pipeline System (BPS). BPS project gained national significance; besides, it gave a prominent impact to NWFD fuel industry development. Due to BPS fuel sector companies that operate in oil and gas provinces of Arkhangelsk Province, Komi Republic and Barents and Kara Sea got direct access to seaports on Russian territory._ Interregional relations are developing in other industries as well. New machine-building companies of Leningrad Province start to co-operate with suppliers from other NWFD regions. For example, ?Ford-Vsevolozhsk? company signed a contract with Bor glass factory on automobile glass supplies._ In NWFD interregional relations are intensified by several automobile transport projects. The southern semi-ring of a road bending round the Onega Lake is under construction; the road will connect parts of Leningrad Province and Republic Karelia. Ferry line ?Ust-Luga ? Baltijsk ? German seaports? will improve transport connection between Leningrad and Kaliningrad Provinces._ But the present intensity of interregional relations within the NWFD is low; non-NWFD regions of Russia and foreign partners of the Province share the bulk of Leningrad Province?s external trade. One reason for such a state of affairs the authors tend to find in the drawbacks of a system of territorial and administrative division, which was formed in Russian Federation in early 90-ies. The authors also suggest one possible solution for the problem: consolidation of existing regions ? Federation Units. For example, it seems reasonable to form 5 larger regions from 11 existing: Neva Region (Leningrad Province and Saint-Petersburg); Old-Russia Region (Novgorod and Pskov Provinces); Lake Region (Murmansk Province and Republic Karelia); Dvino-Pechora Region (Arkhangelsk and Vologda Provinces, Komi Republic, Nenets Autonomous District); Kaliningrad Province preserves its administrative status. The authors believe, that this reform could help interregional links to surmount this artificial disintegration of the NWFD regions and it would enhance their economic development._

The nature of Soviet society: Productive forces and relations of production in the U. S. S. R

https://stars.library.ucf.edu/prism/1019/thumbnail.jp

SENSOR PERFORMANCE ANALYSIS FOR MINE DETECTION WITH UNMANNED VEHICLES IN VERY SHALLOW WATER AND SURF ZONES

The very shallow water and surf zones present extraordinary challenges for classifying submerged objects such as mines or shoals. Accessing these areas with traditional unmanned underwater vehicles is difficult, and remotely operated vehicles often require putting operators in harm’s way. This research explores the potential to perform object classification using only forward-looking sonar in the desired operating zones. Experiments were conducted in a controlled environment for two different target objects, a glass sphere and a rectangular cinder block. Next, forward-looking sonar images were analyzed to determine how the intensity and distribution of target returns changed as a function of distance and angle from the sonar. The ability to correlate experimentally measured intensity profiles with a target’s physical size and shape is examined. Finally, recommendations for future research are proposed to further develop this approach for potential naval applications like mine countermeasures.NECC, Virginia Beach, VA, 23459Lieutenant, United States NavyApproved for public release. Distribution is unlimited

Turbulence and waves in numerically simulated slope flows

Direct numerical simulation (DNS) is applied to investigate properties of katabatic and anabatic flows along thermally perturbed (in terms of surface buoyancy flux) sloping surfaces in the absence of rotation. Numerical experiments are conducted for homogeneous surface forcings over infinite planar slopes. The simulated flows are the turbulent analogs of the Prandtl (1942) one-dimensional laminar slope flow. The simulated flows achieve quasi-steady periodic regimes at large times, with turbulent fluctuations being modified by persistent low-frequency oscillatory motions with frequency equal to the product of the ambient buoyancy frequency and the sine of the slope angle. These oscillatory wave-type motions result from interactions between turbulence and ambient stable stratification despite the temporal constancy of the surface buoyant forcing. The structure of the mean-flow fields and turbulence statistics in simulated slope flows is analyzed. An integral dynamic similarity constraint for steady slope/wall flows forced by surface buoyancy flux is proposed and quantitatively verified against the DNS data

Structure of coating based on 10R6M5-steel after wearing in friction pair

The pressing challenge of modern technology is to increase the service life of friction pairs operating under high dynamic loads and lubricant fluid deficiency. Due to their high hardness, red hardness and wear resistance, high-speed steels are beginning to be used in the manufacture of punches, dies and structural strengthening of rolling mills and friction pairs. In this paper we investigated the friction pair "coating 10R6M5 steel - steel ShKh15". The region of catastrophic wear was detected during the wear resistance test. The paper studies the wear characteristics of 10R6М5-based steel coating after discrete surface laser melting in a friction pair with heat-treated ball bearing steel

Structure of coating based on 10R6M5-steel after wearing in friction pair

The pressing challenge of modern technology is to increase the service life of friction pairs operating under high dynamic loads and lubricant fluid deficiency. Due to their high hardness, red hardness and wear resistance, high-speed steels are beginning to be used in the manufacture of punches, dies and structural strengthening of rolling mills and friction pairs. In this paper we investigated the friction pair "coating 10R6M5 steel - steel ShKh15". The region of catastrophic wear was detected during the wear resistance test. The paper studies the wear characteristics of 10R6М5-based steel coating after discrete surface laser melting in a friction pair with heat-treated ball bearing steel