SEISMICITY of the CRIMEAN-BLACK SEA REGION in 2015

In 2015, 58 earthquakes were registered in Crimea in the range of energy classes КП=5.2–10.8. The bulk of the epicenters refers to the Black Sea. The maximum density of epicenters can be traced in Alushta (№ 3) area and in the Kerch-Anapa area (№ 5). Spectral and dynamic parameters of their foci were obtained for 16 events in the region; and for 1 of them a focal mechanism solution was obtained. Seismic processes in the Crimean-Black Sea region were monitored by seven stationary digital seismic stations. In February, the «Tarkhankut» observation point was closed. Representative registration of earthquakes with Кп=9.0 is still provided for main part of the Crimean-Black Sea region. A peculiarity of spatial distribution of earthquakes is the occurrence of two strongest earthquakes in the year under consideration with КП=10.8 in the Kerch-Anapa (№ 5) and Azovo-Kuban (№ 7) areas. The maximum (Кп=10.8, MLWSG=3.8, Mw=3.8) earthquake occurred on August 16 at 22h38m in the Kerch-Anapa region at the depth of h=7 km. This shock caused tremors in Anapa with the intensity of I=2 according the MSK-64 scale. 2015 is characterized by weak seismic activity. The total number of registered earthquakes, ΣN=58, decreased against ΣN=119 in 2014 and is below than the average Nav=69 for the ten-year observation period (2004–2013). The annual seismic energy is ΣE=1.491011J, that is 5.6 times less than the average value ΣEav=8.41011J for the ten-year period. This suggests that we can expect increased seismicity in the region in subsequent years.

Geometric estimates of variations in space geodetic data

Well-known statistical parameters have some disadvantages when analyzing space geodetic data. Geometric parameters are proposed here for estimating the variation properties of samples for various discrete datasets. The proposed parameters are logically related to each other and are based on the simplest well-known statistical parameters; they do not depend on the type of distribution of the sample under study. “Variation asymmetry” shows the shift of the arithmetic mean relative to the center of the variation interval in the units of the studied sample. “Density of variation” characterizes the level of average variability in sample units. This parameter has several times greater discriminatory sensitivity to extremely different types of variations than linear and standard deviations. The relative parameter “proportion of maximum density” shows the closeness of variation to a uniform distribution in the ranked sample and complements the indicator of variation density. An algorithm for separating different structural levels of the useful signal from emissions (noise) is proposed here based on the calculation of geometric characteristics. The iterations of dividing the sample into structurally homogeneous segments can be stopped at the level of the proportion of maximum density ≥0.9 when analyzing real GPS coordinates.

Optimal Hair Transplant Recipient Site Slit Design: Minimizing Vascular Damage

An often overlooked aspect of hair transplantation is the art of recipient site design and slit creation. There is also a lack of consensus on which technique provides the optimum coverage while minimizing vascular damage. This paper aims to provide logical arguments to determine the optimal instrument and method of slit creation, in order to ensure maximum density, optimal survival, minimal pop-out, and minimal damage to scalp vascularity.The use of semiconical blades reduces the damage to the dermis and vascular plexus as compared with rectangular blades and needles, as the depth of penetration required is lower. The use of acute angle reduces the depth of penetration for the same length of slit and decreases damage to deep plexus. Coronal slits produce less vascular damage than that of sagittal slits with the same size blades.We believe that these recommendations provide the optimum volume slits while causing minimal vascular damage.

Chaplygin strange stars in presence of quintessence

Starting from a regular, static and spherically symmetric spacetime, we present a stellar model formed by two sources of ordinary and quintessence matter both with anisotropic pressures. The ordinary matter, with density [Formula: see text], is formed by a fluid with a state equation type Chaplygin [Formula: see text] for the radial pressure. And the quintessence matter, with density [Formula: see text], has a state equation [Formula: see text] for the radial pressure and [Formula: see text] for the tangential pressure with [Formula: see text]. The model satisfies the required conditions to be physically acceptable and additionally the solution is potentially stable, i.e. [Formula: see text] according to the cracking concept, and it also satisfies the Harrison–Zeldovich–Novikov criteria. We describe in a graphic manner the behavior of the solution for the case in which the mass is [Formula: see text] and radius [Formula: see text][Formula: see text]km which matches the star EXO 1785-248, from where we obtain the maximum density [Formula: see text] for the values of the parameters [Formula: see text], [Formula: see text].

A Study of the Influence of New Generation Granulated Sorbents on the Processes Regulating the Aggregate State of the Blood with the Use of Piezoelectric Thromboelastography

Background: Gastroduodenal bleeding (GDB) and the improvement of endoscopic hemostasis (EH) remain a priority in emergency surgery. This article presents the results of an experimental study of the effects of granular sorbents (Aseptisorb, Aseptisorb-A, Aseptisorb-D) on the system regulating the aggregate state of the blood using modern capabilities of piezoelectric thromboelastography (TEG). Methods and Results: The study involved 12 healthy volunteers (9/75% men and 3/25% women) aged between 18 and 58 years, with the average age of 34.0(26.0;44.0) years. For the study, the blood of healthy volunteers with normal indicators of the system regulating the aggregate state of the blood was used. In vitro experiments: Several tests were performed with the blood of each volunteer. In the first experiment (the control stage), the blood cuvette did not contain the test material. At the second stage of the experiment, the hemostatic properties of new generation granulated sorbents (Aseptisorb, Aseptisorb-A, and Aseptisorb-D) were studied. Experimental studies have shown that the use of granular sorbents Aseptisorb, Aseptisorb-A, and Aseptisorb-D in varying degrees affects the links of platelet and coagulation hemostasis, providing acceleration of thrombosis processes while increasing the maximum density of the clot. These effects determine the effectiveness of the clinical use of these sorbents to stop various types of bleeding. Conclusion: Experimental studies of the effect of granular sorbents on the system regulating the aggregate state of the blood using piezoelectric TEG have shown that the use of Aseptisorb, Aseptisorb-A, and Aseptisorb-D can significantly reduce the time of blood clotting and increase the maximum clot density, which determines the possibility of the use of these sorbents in endoscopic hemostatic treatment for GDB.

The effect of hot-press sintering temperature on density of heavy alloys WNi5Cu3

The effect of hot-press sintering temperature on density of tungsten heavy alloys is presented in this paper. The experiments were performed for the WNi5Cu3 samples of W-Ni-Cu heavy alloy system. The hot-press sintering temperature was ranged from 1300 to 1440 °c with a constant applied pressure of 40 MPa. Subsequently, the sintered samples were annealed at 1000 °c in acgon atmosphere during 3 h. The results showed that the obtained heavy alloys had maximum density of 17,427 g.cm3 and final particle size around (10 + 15) mm. The obtained results met the requirement for fabrication of small balanced parts for aeronautical industry.