Pages Navigation Menu
Submit scientific paper, scientific publications, International Research Journal | Meždunarodnyj naučno-issledovatel’skij žurnal

2019

ISSN 2227-6017 (ONLINE), ISSN 2303-9868 (PRINT), DOI: 10.18454/IRJ.2227-6017
ПИ № ФС 77 - 51217, 16+

SPARK PLASMA SINTERING OF COPPER-DIAMOND COMPOSITES: EFFECT OF MORPHOLOGY OF B4C COATING ON SURFACE OF DIAMONDS

Posted in 2019, ENGINEERING, Issue № 12(90) December 2019 | 0 comments

Copper-diamond composites were obtained using spark plasma sintering. To improve the properties of the composite on the surface of diamond grains by reactive annealing, B4C coatings of various morphologies (smooth or needle) were obtained in this work. In the case of needle morphology of B4C coatings, the material obtained by spark plasma sintering showed the highest bending strength (up to 320 MPa) and thermal conductivity (680 W/m*K). The use of coatings based on boron carbide with optimized morphology is promising for the manufacture of copper-diamond heat sinks with high technical characteristics.

Read More

FEATURES OF CRYSTALLOGRAPHIC STRUCTURE OF CeO2 BUFFER LAYERS ON r-Al2O3 OBTAINED BY PULSE LASER DEPOSITION METHOD

Posted in 2019, Issue № 12(90) December 2019, PHYSICS AND MATHEMATICS | 0 comments

The paper presents the results of structural studies of CeO2 buffer layers grown by pulsed laser deposition on single-crystal substrates of r-Al2O3 ( ) at a substrate temperature of 750°C. It was shown experimentally that when the oxygen pressure changes during growth, while maintaining the remaining growth parameters unchanged, it is possible to obtain buffer layers with different crystallographic orientations: at an oxygen pressure of 0.002 mbar, the buffer layers have an orientation of (111), and at an oxygen pressure of 0.2 mbar – (002). The results obtained may be of interest for the preparation of epitaxial films and nanoheterostructures with layers of high-temperature superconductors and doped manganites on r-Al2O3 single-crystal substrates with CeO2 buffer layers.

Read More

PATTERN FORMATION ON SURFACE OF HIGH-DENSITY POLYETHYLENE

Posted in 2019, CHEMISTRY, Issue № 12(90) December 2019 | 0 comments

The authors obtained nanocomposite materials in the form of a flexible polymer substrate with a hard coating as a result of plasma treatment of high-density polyethylene (HDPE) films and metal (gold) deposition on the surface of HDPE films. Fragmentation of the hard coating takes place with the formation of a unique ordered relief on the polymer surface during deformation of the obtained materials. Using scanning electron microscopy, the parameters of the obtained relief are determined depending on the drawing conditions and subsequent shrinkage of the deformed nanocomposites. The proposed approach may be applied as a method of modifying the surface properties of polymers.

Read More

METHODOLOGICAL FEATURES OF DETERMINATION OF DIPYRIDYL SALTS IN AGRICULTURE AND PLANT PRODUCTS

Posted in 2019, CHEMISTRY, Issue № 12(90) December 2019 | 0 comments

The paper presents methodological features of methods for determining the residual amounts of dipyridyl salts (on the example of dibromide diquat) in potatoes, peas, rapeseeds, soybeans and vegetable oils using ion-pair high-performance liquid chromatography (HPLC) with an ultraviolet detector after extracting a substance from an analyzed sample with diluted sulfuric acid upon boiling, purification of the extract, and concentration of the substance by ion-exchange chromatography on a column with Dowex 50Wx8 cation exchange resin, as well as additional purification on pat solid-phase C18 Sep Pak extraction. The authors reached the lower limits for the quantitative determination of diquat in potato tubers — 0.025 mg/kg, soybean, rape, sunflower, pea — 0.05 mg/kg, vegetable oils — 0.05 mg/kg.

Read More

PSYCHROTROPHIC MICROORGANISMS OF THE FAR EAST SOILS

Posted in 2019, BIOLOGY, Issue № 12(90) December 2019 | 0 comments

70 psychrotrophic isolates of microorganisms were isolated from the soils of the Far Eastern region of Russia (Sakhalin, Yakutia, the Jewish Autonomous Region, Amur Region, Magadan, Iturup Island, Kamchatka). It was established that three isolates taken from the soils of l. Iturup and Yakutia have all three activities as a result of the screening of these isolated isolates for the presence of enzymatic activity (amylase, protease, and lipase). Two of the three activities showed 16 isolates. Thus, 21 isolates, which were introduced into the collection for further study, are the most promising ones.

Read More

MORPHOLOGICAL AND GENETIC FEATURES OF SOILS IN URUP ISLAND

Posted in 2019, BIOLOGY, Issue № 12(90) December 2019 | 0 comments

The paper presents the results of diagnostics and determination of the classification position of soils, which are located in the central part of Urup Island using the profile-genetic approach. The studied soils were formed on the coastal and slope areas of the island. The morphological, physical, and physicochemical characteristics of the studied soil profiles are provided as well. It was revealed that soils on a steep slope are polygenetic formations, but do not belong to layered soil types. The soils are light in terms of particle size distribution. A decrease was found in the content in depth along the profile of silicon oxide with a simultaneous increase of 1.5-2 times the number of one and a half oxides. The soils developed on the stretch of the sea terrace are layered. It was suggested that the physicochemical properties are influenced not only by plant associations, a low amount of organic carbon, but also largely by proximity to the slightly alkaline waters of the Sea of Okhotsk.

Read More

FERNLIKE PLANT COLLECTIONS IN GREENHOUSE OF SUBGI UFSRC OF RAS

Posted in 2019, BIOLOGY, Issue № 12(90) December 2019 | 0 comments

The authors conducted a taxonomic revision of the of fernlike plant collections in the greenhouses of the SUBGI UfSRC of RAS (27 species and 3 cultivars from 20 genera, 10 families). The analysis of the geographical distribution and ecological confinement of the species in this collection is carried out. The authors established habitual parameters of 22 species in the greenhouse. The phytodesign methods are proposed based on the morphological characteristics and life forms of plants. The potential of the collection as a tool for the implementation of scientific and educational programs of the botanical garden in accordance with the principles of continuous environmental education is described in this paper.

Read More

FUNCTIONS OF POSTPYROGENOUS COAL IN SOILS OF BORAL FORESTS OF FAR EAST

Posted in 2019, BIOLOGY, Issue № 12(90) December 2019 | 0 comments

Boreal forests are the most significant carbon sink among ground ecosystems. Forest fires occur annually on millions of hectares of the boreal zone. Millions of tons of carbon fixed previously by forests are lost in the form of carbon dioxide during combustion, as well as gigatons of post-pyrogenic coal. Being the most inert and long-term combustion product, coal has been attracting the attention of scientists since the mid-20th century, but its ecosystem function has not yet been fully understood. The goal of the study is to establish the effect of coal on soil properties, renewal of vegetation, and decomposition of organic matter in the boreal forests of the Far East. The studies were conducted in the northern part of the Amur Region in the larch forests of the foothills of the Tukuringra ridge. A positive correlation was established between the coal content in the soil and soil acidity (рНH2O) p <0.05, soil moisture, and mobile phosphorus content. Coal has a positive effect on pine regeneration. The coal content in the soil after the fire had no correlation with the content of ammonium forms of nitrogen (NH4+) and the number of larch seedlings (p = 0.664 and 0.5135). Coal accelerates the late stages of decomposition of thin larch roots. The background concentration of coal did not affect the decomposition of the roots, while the double average and maximum concentrations had a similar effect of accelerating decomposition. The research results show that under the conditions of postpyrogenic forests of the Russian Far East, coal performs a significant ecosystem function by accelerating the accumulation of stable forms of carbon in soils and the renewal of coniferous primary forests.

Read More

ORE-GRADE GOLD MINERALIZATION IN PRECEMBRIAN METAMORPHIC COMPLEXES OF CENTRAL ALDAN

Posted in 2019, GEOLOGY AND MINERALOGY, Issue № 12(90) December 2019 | 0 comments

Ore-grade gold mineralization localized in Precambrian complexes is known on most of the crystal shields of our planet. The new genetic type of ore-grade gold mineralization has been discovered in the field of development of Precambrian metamorphic formations in recent years, as a result of exploration in the central part of the Aldan shield. This paper is a continuation of the studies of the gold content of Precambrian formations of the Aldan-Stan shield. This paper presents data on the composition and structure of the pegmatoid gold ore bodies of the deposit named after P. Pinigin localized exclusively in the bases of the tholeiitic series.

Read More

SOME FEATURES OF GOLD DEPOSITS FORMATION OF KHAKANJA, MNOGOVERSHINNOYE AND BELAYA GORA (RUSSIA)

Posted in 2019, GEOLOGY AND MINERALOGY, Issue № 12(90) December 2019 | 0 comments

The analysis of the materials collected by the authors of this paper on the Khakanja and Mnogovershinnoye deposits, as well as those published by predecessors on the same deposits and the Belaya Gora deposit, made it possible to clarify their genesis. The common features of the genesis of these deposits are as follows: 1) a genetic connection with magma pockets and with volcanic processes; 2) the formation of gold ore mineralization took place at the final stages of volcanism in spatial and temporal connection with the formation of subvolcanic and extrusive bodies; 3) the localization of deposits and ore bodies in the most tectonically disturbed rock blocks under the screens of poorly permeable rocks of the upper volcanic cover; 4) the formation of mineralization was carried out by deep magmatogenic fluids in permeable magma and fluid conductors, directly in the thermal fields of subvolcanic and extrusive bodies in a dynamic tectonic regime.

Distinctive features of their formation are as follows: the Belaya Gora deposit was formed following the extrusion formation, which was a screen for incoming deep fluids, as well as an additional heat energy generator to increase fluid pressure, which contributed to the formation of hydraulic fractures in the host rocks, explosive necca brecciation and interstratal mineralization at the Pologii site, under the cover rock screen. The Khakanja deposit was formed near the paleovolcano necca in a shallow zone of the interformational tectonic breakdown of volcanic strata. The Mnogovershinnoye deposit was formed in steeply shielded magma and fluid conductors during the accumulation and convection of fluids in the thermal fields of subvolcanic bodies.

Read More

TECHNOGENIC MINERAL FORMATIONS AND WATERS OF SOME DEPOSITS IN NORTHERN ITALY

Posted in 2019, GEOLOGY AND MINERALOGY, Issue № 12(90) December 2019 | 0 comments

The basic features of the geological structure and material complexes of Northern Italy are shown in the paper. They were studied under the project in conducting research on the noble metal mineralization of technogenic and mineral formations of the International Perm Group of the Perm Region. The authors considered the processes of technogenesis and technogeogenesis, which are typical for technogenic and mineral formations and process waters. Experimental data were obtained on the deposition and enlargement of nanogold particles from solutions on coals, which are the basis for the development of technologies for the development of hydromineral raw materials generated from industrial waters within gold-bearing technogenic and mineral formations.

Read More

EXPECTED CHANGE IN SURFACE BALANCE OF MASS IN GLACIUM COMPLEX OF ELBRUS UNDER CONDITIONS OF GLOBAL WARMING

Posted in 2019, Issue № 12(90) December 2019, SCIENCES ABOUT THE EARTH | 0 comments

The area of the Elbrus glacier complex, which consists of 24 glaciers, currently makes up about 10% of the glaciation area of the entire Caucasus. Climate change has a significant impact on the parameters of the glaciers of Elbrus over the past century. Given the tangible contribution of meltwater from Elbrus glaciers to the total river flow in the mountain and foothill regions of the North Caucasus and its stabilizing role, the interest of researchers in the prognostic calculations of the surface mass balance and glacial runoff becomes clear. In this paper, the authors examine the indicated glaciation parameters during the implementation of the extreme climatic scenario RCP8.5 by the end of this century. It was shown, in particular, that a simultaneous increase in surface air temperature, total solar radiation and a decrease in precipitation calculated on the global climate model and reduced to the Central Caucasus region will cause a significant retreat of the snow line and a reduction in the accumulation area, which will cause the increasing degradation of the Elbrus glaciation in coming years.

Read More

DETERMINING AXIAL LINES POSITION OF MOUNTAIN GLACIERS

Posted in 2019, Issue № 12(90) December 2019, SCIENCES ABOUT THE EARTH | 0 comments

The paper presents predictive calculations of changes in the state of mountain glaciation based on the mathematical modeling methods. The use of three-dimensional models that take into account all types of stresses requires large computational resources, which creates objective difficulties in calculating the evolution of the glaciation of entire mountain systems. This fat has determined the growing interest in relatively simple models, including one-dimensional, so-called “flow-line models”, that is, models that simulate changes in the characteristics of glaciers along the centerlines. Axial lines are built either, in fact, manually, or using fairly complex and costly (semi-) automatic methods. This article proposes a simple algorithm for constructing the axial lines of mountain glaciers for subsequent use in predictive numerical experiments. The algorithm was tested on several mountain-valley glaciers of various configurations.

Read More

GLOBAL CLIMATE MODEL CONSIDERING CARBON CYCLE OF GROUND VEGETATION

Posted in 2019, Issue № 12(90) December 2019, SCIENCES ABOUT THE EARTH | 0 comments

The goal of this work is to build a global hydrodynamic climate model with the inclusion of a new unit for calculating the characteristics of terrestrial vegetation based on the carbon cycle. The vegetation unit describes the production process of forest ecosystems in the seasonal mode of climatic factors. It is established that the global characteristics of the climate system are reaching their steady state over a period of about 2000 years and the model is working stably. The temporal and spatial distributions of the obtained climatic characteristics and the biogeochemical carbon cycle of terrestrial vegetation are presented.

Read More

TECHNOGENIC TRANSFORMATION OF HEAVY METAL STREAMS IN SOILS IN REGIONS UNDER INFLUENCE OF COPPER-NICKEL PRODUCTION

Posted in 2019, Issue № 12(90) December 2019, SCIENCES ABOUT THE EARTH | 0 comments

The paper presents the results of work on the assessment of the technogenic transformation of heavy metal flows in soils on the Kola Peninsula in 2018. The concentrations of heavy metals in soils are significantly higher than the standards at most sites studied. The average gross Ni content exceeds the standard by 80 times, the content of mobile forms of Ni by 40 times; the average gross Cu content – by 22 times, the content of mobile Cu forms – by 85 times. The maximum concentrations of Ni, Cu, Co are observed at a distance of 8 km from the pollution source in a southerly direction. Mn, Fe, and V are relatively evenly distributed throughout the study area. The concentrations of Ni, Cu, Co, Cd, and Pb in the upper soil horizon are higher than in the illuvial one. This suggests that these metals come mainly from the atmosphere. According to the total pollution index (Zc), the soils of the upper horizon of all sites are classified as dangerous, and at a distance of 8 km from the plant they are extremely dangerous. According to the correlation between the content of chemical elements in the soil, two associations are identified: the first – Ni, Cu, Cd, Pb, Co, Zn and Mn; the second one is Cr, V, Fe, and Sc. In general, despite a decrease in the content of heavy metals in the soil, their amount remains high and a disturbance in the natural geochemical cycle is observed.

Read More

NOSOLOGICAL PROFILE OF PARASITICAL DISEASES OF FISH IN ROSTOV REGION IN 2016-2018

Posted in 2019, Issue № 12(90) December 2019, VETERINARY SCIENCE | 0 comments

The fishing industry is among the traditional ones in Russia. In general, Russian fisheries are a complex sector of local economy, which includes various types of activities ranging from forecasting the raw material base of the industry and ending with the organization of fish product trade in the country and abroad. However, there is a number of problems, the obstacles to the diversified development of the industry. One of these problems is outbreaks of parasitic and infectious diseases that reduce the productivity of fish farm ponds. This causes great damage to fisheries; the estimated loss is about 20-30% of salable fish. In addition, large amounts of money are spent on measures to prevent and rehabilitate fish on these farms.

Read More

PLACENTAL MALFUNCTIONS DURING PREGNANCY AFTER RECONSTRUCTIVE OPERATIONS ON UTERUS

Posted in 2019, Issue № 12(90) December 2019, MEDICINE | 0 comments

The problem of the development of placental insufficiency during pregnancy takes a special place in obstetric practice. The goal of this work is to study the features of the development of the placental disorder during pregnancy that occurred after the surgical correction of uterine malformations.

The authors conducted a survey of 30 patients who became pregnant in a natural way after corrective operations on the uterus. The control group consisted of 40 pregnant women with an uncomplicated course and normal uterine anatomical structure. The leading complications of pregnancy after undergoing operations on the uterus are as follows: a compensated form of placental insufficiency and the threat of miscarriage.

Read More

DRUG EFFECT ON LABORATORY TEST RESULT ON NARCOTIC AND PSYCHOTROPIC SUBSTANCES

Posted in 2019, Issue № 12(90) December 2019, MEDICINE | 0 comments

A wide range of specialties is subjected to laboratory testing for the presence of narcotics and psychotropic substances in biological fluids according to the laws of the Russian Federation. In most cases, an immunochromatographic analysis is used for that, but a significant drawback of this method is the possibility of a false-positive test result. The reason for this may be in cross-reactions occurring in a body due to the use of drugs that are not related to the groups of narcotics and psychotropics. Studies show that false positives for amphetamines are most common. So, the goal of this study is a detailed consideration of this phenomenon, as well as a review of drugs that can imitate the appearance of a metabolite of a psychotropic substance in a human body. The data obtained can be used both in research and in practical activities of biologists, pharmacists, pharmacologists and clinicians of various specialties.

Read More

COMPLEX DIAGNOSTICS OF REPEATED VOMITING

Posted in 2019, Issue № 12(90) December 2019, MEDICINE | 0 comments

Cyclic vomiting syndrome is a pathological state in which a patient experiences at least three separate attacks of vomiting, each of which is accompanied by more than four vomiting episodes at the height of the disease. In typical cases, no more than two episodes per week are observed. The average duration of an attack is 24-48 hours (minimally 2 hours), but it can last for 10 days or more. The duration of the intervals when a patient is free from vomiting and is practically healthy is different. Isovaleric acidemia has similar symptoms.

Read More

TEAM EFFECTIVENESS PROGRAMS FOR MEDICAL PERSONNEL OF NON-EMERGENCY ASSISTANCE

Posted in 2019, Issue № 12(90) December 2019, MEDICINE | 0 comments

The paper presents the overview of foreign programs intended to improve the quality of teamwork of medical personnel on an outpatient basis, in long-stay patients and primary health care departments, as well as rehabilitation clinics. It is shown that the basis of most programs are theoretical and practical seminars, during which great attention is paid to the development of “non-technical” skills of staff: setting common goals for the team, effective communication, mutual assistance in decision making, leadership, situational awareness, and self-confidence. The high efficiency of the practical use of methodological developments and interactive courses in various countries and areas of medical care is shown in this work. At the same time, many courses are adapted for just a strictly defined medical field, while there are still very few programs tested in the clinical setting and suitable for workers in different medical fields. In this regard, it is relevant to expand the profile of programs to improve the quality of teamwork of medical personnel and apply the already gained experience with the adaptation of the programs considered in work for Russian healthcare.

Read More