bluuebunny/crossref_metadata_2025 huggingface dataset:
A NEW CONCEPTUAL APPROACH TO THE ORGANIZATION OF TECHNICAL DIAGNOSTICS SERVICE AT NUCLEAR POWER PLANTS WITH VVER
Authors: Slepov M. T.
Published: January 2023

The article identifies and summarizes the main problems that arise in the process of production activities of NPP technical diagnostics services. The analysis is carried out and the main directions of efficiency improvement are formulated, based on the personal experience of the author. Some features of the operation of various technical diagnostics systems are disclosed. The concept of multichannel synchronized measurements developed by the author is presented.
METHODS OF CONTROL AND DIAGNOSTICS OF PRODUCTS FROM REACTOPLASTES (BRAKE PADS)
Authors: Larchenko A. G.
Published: January 2023

The paper describes the existing directions and features in the field of non-destructive testing of thermosetting plastic products, in particular, brake pads of freight cars. The article presents defects that lead to a decrease in the declared resource of wheelsets as a result of interaction with the brake pad during operation. The process of enveloping metal is described. Describes production data provided by railcar repair companies, accompanied by illustrative material. Analyzed are methods of non-destructive testing, the use of which will reduce the damage to wheelsets, by selective testing of brake pads from each batch supplied to a repair facility or plant. Conclusions and tasks for further research are formed.
THE ANALYSIS OF METHODS OF DETECTING OF METALS ON THE BASIS OF PROPERTIES OF ELECTRICAL CONDUCTANCE
Authors: Artemiev B. V. , Vanroye N. K. , Golovin N. A.
Published: January 2023

This article presents the existing methods of metal detection. The physical processes arising in the volume of the conductor when an alternating electromagnetic field is directed at it are considered. The results of the study of the effect of the magnetic field generated by Foucault currents on the rate of change of the inductor EMF during operation in the pulse mode are presented. The principle of operation of the metal detection module with their discrimination is described. It is determined that this principle can be widely used in non-destructive testing. The relevance of the study is determined by the growing need for reliable and versatile means of detecting metals with a large depth of search, as well as the use of microprocessors for the analysis of a metal sample for its belonging to a certain genus.
FREQUENCY-PARAMETRIC CONTROL SYSTEM OF AN ASYNCHRONOUS ELECTRIC DRIVE WITH AN OBSERVER OF THE ANGLE BETWEEN THE VECTORS OF THE STATOR CURRENT AND THE MAGNETIZATION CURRENT
Authors: Meshcheryakov V. N. , Kryukov O. V.
Published: January 2023

In industry, especially metallurgy, a large number of previously installed electric drives based on an asynchronous motor with a phase rotor with uneconomical parametric control systems are used, the advantage of which is the possibility of removing part of the sliding energy from the rotor circuit, and the ability to obtain an increased inrush current multiplicity. The use of frequency converters in such an electric drive allows you to adjust the speed of rotation of the stator field and maintain sliding and losses in the rotor circuit at a minimum level. However, when the rotor windings are shorted, the multiplicity of the starting torque decreases. Additional possibilities for maintaining an increased starting torque of an asynchronous motor with a phase rotor with frequency control are provided by the inclusion of a frequency-dependent active-inductive resistance (IR) in the rotor circuit. In this case, the electric drive will be frequency-parametric. Using an observer of the mutual position of the stator and rotor current vectors, working on the basis of processing the measured signals of instantaneous values of the stator and rotor currents, allows you to build a scalar control system with stator current correction, bringing the operation of the electric drive to the mode with minimal losses in the motor windings.
EXTREME METHOD FOR SOLAR PHOTOMETERS CALIBRATION
Authors: Asadov H. H. , Chobanzade I. G.
Published: January 2023

Solar photometers are currently one of the main meteorological instruments with which the optical thickness of atmospheric aerosol and the total amount of water vapor in the atmosphere can be measured. These devices are also functionally suitable for estimating the total amount of ozone in the atmosphere, which confirms the importance of solar photometers for meteorological science. At present, aerosol measurement networks based on such devices are being built everywhere. The most important condition for the normal functioning of a solar photometer is the accurate calibration of this device. The article is devoted to the development of a new method of calibration of solar photometers, in which the influence of atmospheric aerosol instability is almost completely eliminated. It is shown that the total calibration error of solar photometers consists of two components: (a) the error caused by the instability of atmospheric aerosol; (b) the error of the geometric construction of the Langley diagram. The first of these components is practically considered unrecoverable by existing methods, and the second can be eliminated using previously proposed computational methods. The developed extreme method of calibration of solar photometers eliminates the need to construct a Langley diagram for several hours, during which the atmospheric aerosol, due to its variability, introduces a significant error in the calibration result. Thus, the main drawback of the classical Langley method is eliminated. The effect of increasing the accuracy of calibration is achieved by forming an additional informative indicator and further investigation of the extremum of this newly introduced indicator. Quantitative indicators of the achieved effect of increasing accuracy are given. As an example, it is shown that despite some high duration of implementation of the proposed method, it becomes possible to eliminate the aerosol error of 2.74 % that occurs when the optical thickness of the atmosphere is less than 0.1, and when this indicator is unstable by 10 percent during the implementation of the Langley method. The functional optical scheme of the device and the algorithm for implementing the proposed calibration method are given.
ABOUT INFLUENCE OF THE PARAMETERS OF THE ELECTRICAL CIRCUITS OF TRANSMISSION AND RECEPTION OF A SINGLE CRYSTAL NORMAL PROBE ON THE CHARACTERISTICS OF THE FREQUENCY SPECTRUM AND THE PULSE OF THE BOTTOM ECHO
Authors: Danilov V. N.
Published: January 2023

Based on computer modeling of the electro acoustic channel of a normal probe for a reflector in the form of a bottom surface, the influence of elements of the electrical circuits of the probe on the characteristics of the frequency spectrum and pulse of the recorded echo signal is considered. It is shown that the use of corrective inductance to compensate for the reactance of the piezoelectric probe plate provides an increase in the amplitude of the signal, and the parallel connection of the corrective inductance in the electrical circuits of the probe during transmission and reception has an advantage over serial connection. Examples of choosing the parameters of the elements of the electrical circuits of the probe to receive a signal with the highest amplitude are given. In general, the optimal choice of such parameters depends on the electrical impedance of the piezoelectric plate of the probe, taking into account the influence of the reverse piezoelectric effect.
APPLICATION OF NEURAL NETWORKS IN ULTRASONIC NON-DESTRUCTIVE TESTING (REVIEW)
Authors: Badalyan V. G. , Vopilkin A. Kh.
Published: January 2023

A review of the current state and experience of the practical application of artificial neural networks in ultrasonic non-destructive testing is presented. Separately, the features of the use of neural networks for the classification of defects according to data obtained by echo-pulse methods and the TOFD are considered. Information is given on the efficiency of defect classification using neural networks for various ultrasonic testing tasks.
QUASI-DISTRIBUTED RECIRCULATED FIBER OPTIC GASEOUS OXYGEN MEASUREMENT SYSTEM
Authors: Polyakov A. V.
Published: January 2023

A scheme of a quasi-distributed fiber-optic system for monitoring the oxygen concentration of the recirculation type is proposed. The principle of measurement is to register changes in the recirculation frequency of single optical pulses with periodic regeneration simultaneously at several wavelengths. The operation of the sensor is based on a change in the length of the magnetostrictive strips and the segments of optical fibers associated with them under the influence of a changing magnetic field due to the paramagnetic properties of gaseous oxygen. The numerical estimation of the measurement error has been carried out. It is shown that with a length of the sensitive element of the sensor of 1.5 m and a radius of 0.6 ... 0.7 m, it is possible to obtain a relative error of the measurement method no worse than 0.6% for pure oxygen and 2.5% for an air mixture.
MICROWAVE FLAW DETECTION
Authors: Matveev V. I. , Potapov A. I.
Published: January 2023

The article provides a brief overview of methods of dielectric flaw detection using microradiowaves. The main types of inhomogeneities and defects detected by microwave flaw detectors are described. Control schemes with one-way and two-way access to the object of control are considered. Reflection flaw detectors are preferable when they are implemented in practice. The possibility of obtaining radio images of internal defects by scanning converters or using multielement receivers is shown.
CREATION OF A MULTI-LEVEL AUTOMATED CONTROL SYSTEM FOR MONITORING THE SAKHALIN–KHABAROVSK–VLADIVOSTOK MAIN GAS PIPELINE
Authors: Vasenin A. B. , Stepanov S. E. , Ippolitov V. A. , Pogodina S. A. , Kryukov O. V.
Published: January 2023

The features of the design and implementation of the integrated automated control system of the Sakhalin–Khabarovsk–Vladivostok main gas pipeline, which provides reliable and energy-efficient operation of natural gas supplies to consumers of the Far Eastern region of the Russian Federation and energy exports to foreign countries, are considered. The natural-climatic and geophysical conditions of laying the gas pipeline route are presented, which determine the set of functional capabilities for monitoring and managing technological processes of gas transportation. A hierarchical structure of an integrated automated process control system is proposed, which provides adequate monitoring of stochastic disturbances of a natural and technological nature based on intelligent sensors and basic principles of information exchange organization. Examples of innovative design solutions for the functional structure and architecture of the organizational and functional automated control system of the gas pipeline, as well as technical means as part of the structure of the complexes of technical means of automated control systems functioning as part of control rooms are considered. A scientifically based procedural algorithm for calculating the stress-strain state for the monitoring site based on the analysis of sensor readings for short-term forecasting of changes in the technical condition of the gas pipeline has been obtained.
CALCULATIONS OF ACOUSTIC СHANNELS OF A TANDEM TECHNIQUES WITH USAGE OF TRANSVERSE WAVES AND TANDEM WITH TRANSFORMATION OF TRANSVERSE WAVES IN LONGITUDINAL ON THE UPRIGHT ORIENTED PLANAR REFLECTOR SUCH AS A FLAT BOTTOM HOLE
Authors: Danilov V. N.
Published: January 2023

The computer simulation of acoustic сhannels of a tandem techniques on transverse waves (usual) and with transformation of radiated transverse waves in longitudinal on a upright oriented surface of the reflector such as a round flat bottom hole is conducted, during which one the calculations of echo signals for different stratification depths of the reflector, angles of probes and bases to apex are executed. For both methods the influencing on amplitude of a registered signal of a rule position of the reflector on depth of the control is established. The obtained formula of an acoustic сhannel of a tandem technique with transformation allows to conduct calculations of a echo signal at change of spacing interval from the reflector up to transmitting and receiving probes. It is showed, that at a ultrasonic probe technique of objects with a bottom surface without a cladding fused layer with usage of a tandem technique with transformation of transverse waves in longitudinal as contrasted to by usual scheme the tandem of advantages has no.If the bottom surface of object contacts to a cladding fused layer, the ultrasonic probe technique with usage of the scheme a tandem with transformation of transverse waves in longitudinal for the upright oriented planar reflector can be more sensing, than with usage of the usual scheme a tandem.
MICROWAVE MOISTURE MEASUREMENT
Authors: Matveev V. I.
Published: January 2023

The article describes the wide possibilities of microwave methods for measuring humidity of a large range of products, their differences and advantages. Specific examples and the most common schemes of implemented microwave moisture meters are given. The ways of development of microwave moisture measurement in modern conditions are shown.
ASSESSMENT OF THE AMOUNT OF EMISSIONS OF POLLUTANTS INTO THE ATMOSPHERE
Authors: Kharlamov N. R. , Kiryanova A. D. , Larionov N. M. , Karakeyan V. I. , Ryabyshenkov A. S.
Published: January 2023

The results of the assessment of the composition of emissions of pollutants during the process of epitaxy into the atmosphere are presented. Using the example of a typical model of the epitaxy process and instrumental measurements, it was found that in the air removed from the epitaxy and charge discharge installations, the lead content is at the level of 99 %. Based on the material balance, the total lead emission capacity and its gross values are determined for the current and expanded production scale. It is shown that with an increase in the volume of production, the size of the sanitary protection zone of the enterprise is subject to revision in the direction of increase.
ESTIMATION OF RELATIONSHIP BETWEEN INFORMATION COMPONENTS AND NOISE OF ACOUSTIC EMISSION SIGNALS
Authors: Altay Ye. , Fedorov A. V. , Stepanova K. A.
Published: January 2023

In this article, a method for processing acoustic information is presented to assess the correlation relationship of information components and noise of acoustic emission (AE) signals. The method is based on a polynomial approximation of bidirectional Butterworth high and low pass filters. The operability of the processing method on full-scale samples of the noisy AE signal is analyzed and the evaluation of the received processing is carried out on the basis of quantitative indicators. Bidirectional implementation of high-pass filters improves the quality of processing when compared with a low-pass filter. To assess the correlation relationship using the considered processing method, fragments of the information component and noise are isolated from the noisy signal. Based on the selected components, a high correlation relationship between AE information signals and noise has been established.
ANALYSIS OF THE ERRORS OF DETERMINING THE EQUIVALENT SIZE AND ORIENTATION OF A PLANE DEFECT UNDER MANUAL ULTRASONIC CONTROL
Authors: Kireev A. N. , Kireeva M. A.
Published: January 2023

The article reviews and analyzes the method of defect identification for determining the angle of inclination of a planar point defect to the input surface of an ultrasonic wave and its equivalent size during manual ultrasonic testing by the echo-pulse method. The method is most widely used in ultrasonic control of parts obtained by plastic deformation (forging, hot and cold stamping, rolling). This is due to the fact that defects in such parts are predominantly planar in nature. The method of ultrasonic defect identification is based on the use of a combined transducer P131-2.5-0i18-VO-04 containing two piezoelectric transducers in one housing with a normal input of a longitudinal ultrasonic wave and an input angle of 18º. The article presents a mathematical apparatus for the implementation of this method. Also presented is a software product that allows you to automate calculations when using this method of defect identification. The article carried out experimental studies of this method of ultrasonic defect identification, which showed its low error and high efficiency. The average value of the relative error in determining the angle of inclination of a planar point defect to the input surface of an ultrasonic wave was 1.525 %. The average value of the relative error in determining the equivalent size of a planar point defect located at an angle to the ultrasonic wave input surface was 1.192 %.
INVESTIGATION OF METAL STRUCTURE BY NON-DESTRUCTIVE ULTRASONIC METHOD
Authors: Ushakov V. M. , Danilov V. N.
Published: January 2023

The results of ultrasonic testing of metal before and after the operation of pipelines of thermal power plants are presented. Based on the metallographic analysis data, the frequency of ultrasonic waves was selected for research 10 and 15 MHz. It was found that the smallest effect of the surface roughness of the tested samples from the 12X1MF (Ra = 0.07…3.50 microns) was observed at a frequency of 15 MHz. It is shown that on the rough surface of samples Ra = 1.17…2.50 microns, the ratio of the amplitude of the 3rd bottom echo to the amplitude of the average noise level decreases to 17 dB at a frequency of 15 MHz with a metal operating time of 300 000 hours. The specified parameter is proposed to be used in metal structroscopy by ultrasonic method. It is shown that the shape of the pulse and its spectrum are subject to the greatest distortion at a frequency of ultrasonic waves equal to 15 MHz.
CONTROL OF DYNAMIC PROCESSES USING MICRORADIOWAVES
Authors: Matveev V. I. , Bazhanov A. S.
Published: January 2023

The article discusses modern microradiowave methods and means of remote control of parameters of dynamic processes associated with movement, rotation, change of position and condition of objects of control. The main advantages of the methods are contactlessness, remoteness, inertia-free and efficiency. Examples of developments that implement the capabilities of microradiowave methods for monitoring dynamic processes are given. Advantages and prospects are shown.
MECHANIZED ULTRASONIC INSPECTION OF TIEIN WELDS OF THE MAIN GAS PIPELINE WITH AN AUGUR-ART FLAW DETECTOR
Authors: Bazulin A. E. , Butov A. V. , Tikhonov D. S. , Romashkin S. V.
Published: January 2023

To perform ultrasonic testing of golden joints of the main gas pipeline, a procedure for mechanized ultrasonic testing was developed. The procedure complied with the requirements of EN ISO 13588:2019 inspection level C and EN ISO 10863:2020 inspection level C. Testing for transverse defects was carried out using conventional piezoelectric transducers using the echo-mirror method and frontal SAFT processing. The use of the AUGUR-ART flaw detector, the SPIDER scanner and the ECHO-scan and AUGUR-Analysis software demonstrated stable detection of defect simulators in the reference block. All this made it possible to analyze the shortcomings of welding at training joints and successfully perform golden joints of the main gas pipeline.
DETECTION OF BEARING RING DEFECTS MAGNETIC POWDER METHOD RESIDUAL MAGNETIZATION METHOD
Authors: Otoka A. G. , Lyakh A. M.
Published: January 2023

A brief overview of the operational defects of bearing rings detected by the magnetic powder method is given. Various installations used on the railway are presented with a description of the control technology. Photographs with indicator drawings of defects detected by the magnetic powder method are shown.
EXPERT ASSESSMENT OF THE PO-3 MOBILE NEUTRON REFLECTOR CONDITION OF THE IBR-2 REACTOR WITH USING DISCRIMINANT AND CORRELATION METHODS OF ITS VIBRATION ANALYSIS
Authors: Sokolova A. G. , Balitsky F. Ya. , Sizarev V. D.
Published: January 2023

In the development of vibration condition monitoring technology of the movable reflector PO-3 of the IBR-2 research reactor with using S-discriminant vibration analysis [1], the paper presents data and results of a correlation assessment of the stochastic interrelationship degree between S-discriminant and spectral functions in various frequency bands over 8 years of operation of the installation. This made it possible to identify the main sources of vibration activity of units of neutron reflector, developing operational malfunctions of some of its bearings and their influence on changes in its vibration and technical condition.
DIFFERENTIATION OF SURFACE AND INTERNAL DEFECTS BY USING TAIL FIELD LEAKAGE DATA AT HIGH-SPEED MFL TESTING
Authors: Antipov A. G. , Markov A. A.
Published: January 2023

In the practice of magnetic flux leakage non-destructive testing the problem of distinguishing signals generated by dangerous internal defects from signals generated by surface flaws is very acute. In this paper on the basis of three-dimensional computer simulation it was shown that at significant inspection speed the area of the maximum magnetization of the most remote from the surface metal layers under the influence of emerging eddy currents is shifted behind the rear pole of the magnetizing system. Studies of magnetic induction distributions in the testing object in the form of a rail from speed, from the distance of the section under consideration relative to the rear pole and from the depth of the layer are carried out. Also, the distributions of the field in the presence of two types of defects – surface and internal – are studied. It was found that the magnetic field distribution behind the rear pole differs significantly from the distribution in the interpole space. Two contrary magnetic fluxes are formed behind the rear pole: in the bulk of the object the magnetic flux moves in one direction and near the surface magnetic flux flows in the opposite one. Since the flux directions are opposite, the signals from surface and internal defects have different polarity, which can be used to differentiate them.
SECURITY TECHNOLOGIES USING MICRORADIOWAVES
Authors: Matveev V. I. , Kovalev A. V.
Published: January 2023

The article describes the possibilities of using microradiowaves in solving practical problems in the field of security technologies. Examples of solving practical problems are given. Specific types of devices and their developers are specified. The features of the use of ultra-wideband radar methods in solving security problems are highlighted. The prospects of using microradiowaves in the direction of creating modern security tools are considered.
OPTIMAL CONTROL OF THE AEROSOL SCATTERING MODE EMITTED FROM GAS FLARES
Authors: Agayev F. G. , Asadov I. H.
Published: January 2023

The problem of the best dispersion of aerosol emitted from gas flares is formulated. The problem is solved by further developing the wellknown Sky-LOSA theory developed for measuring the total amount of aerosol mass generated in flares. The optimization criterion is the possibility of detecting the minimum aerosol mass in this direction. The possibility of controlling gas combustion adaptively when the torch generates a minimum aerosol mass is shown. An algorithm for implementing the method is proposed.
INCREASING THE SIGNAL-TO-NOISE RATIO IN EDDY CURRENT NDT BY CREATING OF AN INHOMOGENEOUS ELECTROMAGNETIC FIELD
Authors: Semenov A. V.
Published: January 2023

In this article, using the example of multistrand rope inspection, the ways of increasing the signal-to-noise ratio in eddy current control are considered. Based on the results of numerical simulation, a comparative analysis of encircling addycurrent probes with different lengths of the exciting coil is carried out. A probe with a narrow exciting coil has a pronounced dependence of the ratio of signals from defects in different layers on the position of the measuring coils. The use of measuring coils located at different distances from the center of the exciting coil makes it possible to increase the signal-to-noise ratio due to the separation in the radial direction of the parts of the object that mainly form signals and noise in different measuring coils. The use of a system of surface measuring coils instead of encircling measuring coils makes it possible to increase the signal-to-noise ratio due to the separation in the azimuthal direction of the parts of the object that mainly form signals and noise in each of the surface measuring coils.
RECOMMENDATIONS FOR THE DEVELOPMENT OF GEAR CONTROL METHODS ON CMM
Authors: Ushakov M. V. , Vorobev I. A. , Nikolsky S. M.
Published: January 2023

This article provides the methodological foundations for building programs designed to control coordinate measuring machines of any type when measuring the parameters of straight-toothed gears. The scope of the described approach to the described problem is considered, as well as the ways and expediency of its further development. The presented technique describes an approximate scheme of movements of the measuring element, as well as some features during its development. The fundamental mathematical dependencies are given, which allow calculating the shape of the lateral surface of the gears based on the results of the coordinate measuring machine, for subsequent evaluation of its errors. The results of measurements for further processing should be stored in the form of arrays, which indicate the numbers of controlled teeth, the left or right sides of the tooth, as well as the level of measurements and the index of the controlled radius. The development of an experimental control program based on this technique showed the possibility of significantly expanding the range of use of coordinate measuring machines that are not equipped with specialized software and additional equipment designed for measuring gears. Terminology, designations and requirements are given in accordance with GOST ISO series (GOST ISO 1328-1–2017 and GOST 13755–2015 (ISO 53:1998)), which differ in some parameters from those previously adopted (GOST 1643–81, GOST 16531–83, GOST 16532–70, etc.).
MOBILE HARDNESS MEASURING TOOLS: STATE AND PROSPECTS
Authors: Matveev V. I.
Published: January 2023

The article briefly describes the main methods of hardness measurement in non-stationary field conditions. Among them are dynamic and ultrasonic methods, which made it possible to create portable devices of wide application. The features and advantages of modern mobile means of measuring the hardness of materials of numerous technological structures are described. The information about the main manufacturers of portable hardness testers and metrological means of their calibration and verification is given.
ABOUT THE DISSERTATION COUNCIL AT THE RESEARCH INSTITUTE OF INTROSCOPY
Authors: Klyuev V. V. , Bobrov V. T. , Galkin D. I. , Efimov A. G. , Shubochkin A. E.
Published: January 2023

The article describes the activities of the dissertation Council, formed on the basis of the research institute of introscopyin 1975, provides information on the results of the Council's work and the directions in which the defenses were performed in the period from 2000 to 2022. In conclusion, the prospects for the transformation of the Council in connection with the introduction of a new nomenclature of scientific specialties are considered.
Respon Histologis Aorta dan Jantung Rattus Norvegicus Hiperlipidemia Setelah Pemberian Jus Buah Kersen (Muntingia calabura L.) dan Ekstrak Daun Lakum (Cayratia trifolia L.)
Authors: Agustina Enyda , Saraswati Tyas Rini , Tana Silvana
Published: January 2023

This study aims to determine the histological features of the aorta and heart of male Rattus norvegicus after  administration of cherry juice (Muntingia calabura L.) dan lakum leaf extract  (Cayratia trifolia L.). The study used 30 male Rattus norvegicus L.  in a Completely Randomized Design (CRD) consisting of 5 treatments with 6 repetitions, namely the control group (P0), the standard feeding group (P1), the hyperlipid feed group + 0.2 mL/200 g BB cherry juice (P2), the hyperlipid feed group + 40 mg / 200 g BB lakum leaf extract (P3) and hyperlipid feed group + 0.18 mg / 200 g BB simvastatin (P4). Hyperlipid feed was given during the treatment, which was 28 days. To obtain histological data, preparations were made using the paraffin method and then observed using a photomicrograph with 400x magnification and observing the aortic lumen, foam cells and intracellular accumulation of lipids in smooth muscle. Data were analyzed by ANOVA followed by Duncan Test at a significant level of 5%. The results showed that the addition of cherry juice and lakum leaf extract gave a significant effect on lumen width and thickness of the aortic wall (p <0.05), while on changes in heart muscle cell size no significant effect (p> 0.05). Histomorphometri showed the presence of foam cells and accumulation of smooth muscle lipids in the control and group treatments with hyperlipid feeding. The conclusion of this study was that the addition of cherry juice  and lakum leaf extract can reduce atherosclerotic lesions by eliminating showed foam cells and prevent proliferating smooth muscle cells so the size of the aortic lumen width returns to normal, but didn’t cause enlargement of the heart muscle (cardiomegaly).
Perturbation of elliptic operators in 1-sided NTA domains satisfying the capacity density condition
Authors: Akman Murat , Hofmann Steve , Martell José María , Toro Tatiana
Published: January 2023

Let

Ω
⊂

ℝ

n
+
1

{\Omega\subset\mathbb{R}^{n+1}}

,

n
≥
2

{n\geq 2}

, be a 1-sided non-tangentially accessible domain (aka uniform domain), that is, Ω satisfies the interior Corkscrew and Harnack chain conditions, which are respectively scale-invariant/quantitative versions of openness and path-connectedness. Let us assume also that Ω satisfies the so-called capacity density condition, a quantitative version of the fact that all boundary points are Wiener regular. Consider

L
0

⁢
u

=

-

div
⁢

(

A
0

⁢

∇
⁡
u

)

{L_{0}u=-\mathrm{div}(A_{0}\nabla u)}

,

L
⁢
u

=

-

div
⁢

(

A
⁢

∇
⁡
u

)

{Lu=-\mathrm{div}(A\nabla u)}

, two real (non-necessarily symmetric) uniformly elliptic operators in Ω, and write

ω

L
0

{\omega_{L_{0}}}

,

ω
L

{\omega_{L}}

for the respective associated elliptic measures. The goal of this program is to find sufficient conditions guaranteeing that

ω
L

{\omega_{L}}

satisfies an

A
∞

{A_{\infty}}

-condition or a

RH
q

{\mathrm{RH}_{q}}

-condition with respect to

ω

L
0

{\omega_{L_{0}}}

. In this paper we establish that if the discrepancy of the two matrices satisfies a natural Carleson measure condition with respect to

ω

L
0

{\omega_{L_{0}}}

, then

ω
L

∈

A
∞

⁢

(

ω

L
0

)

{\omega_{L}\in A_{\infty}(\omega_{L_{0}})}

. Additionally, we can prove that

ω
L

∈

RH
q

⁢

(

ω

L
0

)

{\omega_{L}\in\mathrm{RH}_{q}(\omega_{L_{0}})}

for some specific

q
∈

(
1
,
∞
)

{q\in(1,\infty)}

, by assuming that such Carleson condition holds with a sufficiently small constant. This “small constant” case extends previous work of Fefferman–Kenig–Pipher and Milakis–Pipher together with the last author of the present paper who considered symmetric operators in Lipschitz and bounded chord-arc domains, respectively. Here we go beyond those settings, our domains satisfy a capacity density condition which is much weaker than the existence of exterior Corkscrew balls. Moreover, their boundaries need not be Ahlfors regular and the restriction of the n-dimensional Hausdorff measure to the boundary could be even locally infinite. The “large constant” case, that is, the one on which we just assume that the discrepancy of the two matrices satisfies a Carleson measure condition, is new even in the case of nice domains (such as the unit ball, the upper-half space, or non-tangentially accessible domains) and in the case of symmetric operators. We emphasize that our results hold in the absence of a nice surface measure: all the analysis is done with the underlying measure

ω

L
0

{\omega_{L_{0}}}

, which behaves well in the scenarios we are considering. When particularized to the setting of Lipschitz, chord-arc, or 1-sided chord-arc domains, our methods allow us to immediately recover a number of existing perturbation results as well as extend some of them.
Seasonal dynamics of algoflora development of the hyperhaline Kuyalnyk Estuary (North-Western Black Sea Coast, Ukraine)
Authors:   Physical-Chemical Inst. for Environ. and Human Protection of the Ministry of Educat. and Sci. of Ukraine, NAS of Ukraine, 3, Preobrazhenskaya Str., Odesa 65082, Ukraine, Ennan A.A.-А. , Shikhaleeva G.M. ,   Physical-Chemical Inst. for Environ. and Human Protection of the Ministry of Educat. and Sci. of Ukraine, NAS of Ukraine, 3, Preobrazhenskaya Str., Odesa 65082, Ukraine, Tsarenko P.M. ,   Physical-Chemical Inst. for Environ. and Human Protection of the Ministry of Educat. and Sci. of Ukraine, NAS of Ukraine, 3, Preobrazhenskaya Str., Odesa 65082, Ukraine,   M.G. Kholodny Institute of Botany, NAS of Ukraine, 2, Tereshchenkivska Str., Kyiv 01004, Ukraine, Kiryushkina H.M. ,   Physical-Chemical Inst. for Environ. and Human Protection of the Ministry of Educat. and Sci. of Ukraine, NAS of Ukraine, 3, Preobrazhenskaya Str., Odesa 65082, Ukraine, Gerasimyuk V.P. ,   Physical-Chemical Inst. for Environ. and Human Protection of the Ministry of Educat. and Sci. of Ukraine, NAS of Ukraine, 3, Preobrazhenskaya Str., Odesa 65082, Ukraine,   Odesa I.I. Mechnykov National University, Department of Hydrobiology and General Ecology, 2 Dvoryanska Str., Odesa 65082, Ukraine
Published: January 2023

The dynamics of seasonal development of the algae flora of the Kuyalnyk Estuary in 2001–2018 is considered. A significant spatial heterogeneity of the distribution of microalgae in the water area of the estuary in different seasons of the growing season was established. The lowest and highest indicators of the number and biomass of microalgae were observed in the shallow waters of the northern part of the estuary.
Supplement to the macroalgal flora of the Natural Reserve «Cape Martyan» (Crimea, the Black Sea)
Authors:   Nikіtskyi Botanical Gardens – National Scientific Center, Yalta 98648, Crimea, Sadogurskiy S.Yu. , Belich T.V. ,   Nikіtskyi Botanical Gardens – National Scientific Center, Yalta 98648, Crimea, Sadogurska S.О. ,   Nikіtskyi Botanical Gardens – National Scientific Center, Yalta 98648, Crimea
Published: January 2023

As a result of the monitoring studies based on the materials from 2019, six new species of macroalgae were identified for the marine area of the Nature Reserve «Cape Martyan», located on the Southern Coast of Crimea (SCC): Bolbocoleon piliferum Pringsh., Giraudia sphacelarioides Derbès et Solier, Myrionema balticum (Reinke) Foslie, Lithophyllum cystoseirae (Hauck) Heydr., Bonnemaisonia hamifera Har., Choreonema thuretii (Bornet) F.Schmitz (the latter two species were recorded for the hydrobotanical region «Southern Coast of Crimea» for the first time). As a result, the list of marine macrophytes within the boundaries of the Nature Reserve now includes 160 species and intraspecific taxa at the species rank, which consist about 36% of the total number of macrophytes identified in the Black Sea. Thus, the protected water area near the Cape Martyan continues to function as one of the key refugia for natural phytodiversity in the region. At the same time, B. hamifera is an invasive transforming species that has recently invaded the SCC region. This is a threat to the ecosystem of the Nature Reserve, and in the nearest future the invasion may cover the entire Northern Black Sea region. Thus, on the one hand, the results of the study expand the understanding of the level of natural phytodiversity of the reserve, the hydrobotanical region and the region as a whole, but on the other hand – they indicate the problem of developing biological invasion, which, under the conditions of the isolated Azov-Black Sea basin, can have catastrophic consequences.
RUSSIAN MILITARY AGGRESSION AGAINST UKRAINE: IMPACTS ON EDUCATION AND SCIENCE
Authors:   Institute of Geography, National Academy of Sciences of Ukraine, Rudenko L.H. , Zaiachuk M.D. ,   Yuriy Fedkovych Chernivtsi National University, Lisovskyi S.A. ,   Institute of Geography, National Academy of Sciences of Ukraine, Maruniak Eu.O. ,   Institute of Geography, National Academy of Sciences of Ukraine, Munich N.V. ,   Taras Shevchenko National University of Kyiv, Peresadko V.A. ,   N.V. Karazin Kharkiv National University of Kharkiv, Ponomarenko O.M. ,   M.P. Semenenko Institute of Geochemistry, Mineralogy and та Mineralization, Kyiv
Published: January 2023

The study aims to assess the impacts of Russian military aggression against Ukraine on the sphere of education and science, and suggestion of ideas on how to form strategies and tactics to develop education and science in this country after the aggressor is finally conquered. Results. Guided by open cartographic and statistical sources revealing military activity in Ukraine, the authors have preliminarily assessed material, physical and moral losses and suggested ways to overcome the crises that descended upon Ukrainian educational and scientific spheres, in particular, those to transit to the European system of instruction in the establishments of higher education, strengthening of role/significance of learning geography in secondary schools as the discipline that forms worldview systemic thinking in the young generation. Russian military aggression has already disclosed strong and weak sides of geographical instruction in Ukraine, while the interest manifested by western higher education establishments to Ukrainian vis-à-vis gives way to cardinal changes in the system of education, in particular, geographical education in this country.
The effect of profitability and corporate financial distress on auditor turnover in Indonesia
Authors: Surtikanti Surtikanti , Saleh Dean Subhan , Syed Yusuf Sharifah Norzehan , Nindyas Rayna Ratu , Anggadini Sri Dewi , Jamaluddin Ali
Published: January 2023

This study aimed to determine the effect of profitability and corporate financial distress on auditor turnover in Indonesia. This study uses descriptive and verification methods with a quantitative approach. The population used in this study are 56 annual financial statements of Manufacturing Companies in the Pharmaceutical Sub-Sector listed on the Indonesia Stock Exchange. The results showed that profitability had a significant effect on auditor turnover. This indicates that the profitability of a developed company has substantial funds to replace a better auditor. While the company's financial distress has no significant effect on auditor turnover, the change of auditors will ensure the company's financial condition so that auditor changes will not be carried out when the company is in financial distress. The impact of this research is that manufacturing companies can consider this when deciding to change auditors.
Cibogohilir vellagers products and marketplace
Authors: Ratna Komala Adeh , Aris Astuti Wati , Razak Abdul Hadi Abdul
Published: January 2023

This study aims to see the need for a marketplace for Cibogohilir villagers to market their quality products.  The potential of village residents is facilitated with an e-marketplace.  The E-marketplace is a digital media that buyers and sellers can use to fulfill their needs that are not limited by space and time.  The research method used is a survey method using a questionnaire via a Google form. Respondents were 13 business actors in BUMDes Cibogohilir. The data analysis was carried out through descriptive analysis. Data processing using SPSS. The study results show that the marketplace's level of closeness to partner satisfaction is very close.  The community needs a marketplace application system that serves as a medium for Cibogohiir villagers to market their products.  The marketplace allows villagers to market their classy and quality products to the outside world.
Digitalization and informal MSME: Digital financial inclusion for MSME development in the formal economy
Authors: Kurnia Rahayu Siti , Budiarti Isniar , Waluya Firdauas Dony , Onegina Viktoria
Published: January 2023

This study examines digital financial inclusion and uses Fintech for informal micro small and medium enterprises (MSMEs) to overcome the financing gap. The researchers used primarily qualitative methods, namely a qualitative analysis strategy verification through inductive analysis. The results show that Indonesia's fintech landscape makes MSME a driver of the digital economy so that they can overcome the financing gap in the informal sector. The challenges faced by Fintech in encouraging MSME business efficiency in the form of unbalanced agency distribution, data security, data access problems, low digital financial literacy, low connectivity, and interoperability can be overcome by taking advantage of existing opportunities. These opportunities include the role of MFIs and cooperatives in promoting financial inclusion and the development of telecommunications infrastructure networks in Indonesia. The novelty of this research is the comprehensive evaluation of achieved progress in digital financial inclusion for MSMEs in Indonesia and the developed recommendation for regulations by relevant authorities to encourage the business efficiency of MSMEs through facilitating digital financial inclusion.
Poverty reduction in Indonesia through utilization of social security fund application
Authors: Karniawati Nia , Andiani Yevi
Published: January 2023

The purpose of this study is to examine poverty reduction through the utilization of social security fund applications. The social security fund application is named SIKS-NG. This is an application that aims to collect data on social security funds. In distributing social security funds (bansos), it is necessary to have data on the recipient of the social security fund (bansos). The data must be accurate so that the social security fund (bansos) will be on target. This study uses a descriptive method with a qualitative approach. The study results show that SIKS-NG is a solution for integrated, effective, and efficient management of poverty data. It contributes to the reduction of poverty. This follows the Sustainable Development Goals (SDGs), ending poverty everywhere and in various forms. SIKS-NG implements appropriate social protection systems and measures for all levels of society in Indonesia.
Economic growth and its influence on environment sustainability: A bibliometric analysis using VOSviewer application
Authors: Abhi Rafdhi Agis , Soeryanto Soegoto Eddy , Neni Hayati Euis , Saputra Herry , Untsa Mega Raiswati , Ihsan Rifaldi Muhammad
Published: January 2023

This study aims to identify the research development on economic growth and its influence on environmental sustainability. The method used is descriptive analysis with a qualitative approach. To gather the data, we used Publish or Perish software using economic growth and its influence on environmental sustainability as the theme from 2012 to 2022. VOSviewer software was used to create the visualization of research distribution data. The results show that the research had become a trend in seven years, from 2012 to 2018, with the highest publication in 2016, 136 articles. However, from 2019 to 2022, the research trend began to decline. In conclusion, this study can be considered valuable as it can be combined with other parameters to provide novelty in future research.
Tourism development policy based on digital economy in Lombok national tourism destination
Authors: Kurniati Poni Sukaesih , Suryanto Suryanto
Published: January 2023

Lombok is one of the national priority tourism areas, which is the government's development target. One of the tourism developments in Lombok that will contribute to the community's welfare is economic development. The purpose of this study is to analyze the digital economy-based tourism development policy in Lombok's national tourism destination. The research method is descriptive qualitative data collection techniques through observation, interviews, documentation, and literature study. The method of determining the informants used purposive sampling. Test the validity and reliability of the data using data triangulation techniques. The results show that Lombok's digital economy-based tourism development policy is not yet optimal. This can be seen from the limited marketing and distribution of community products, especially for MSMEs. So, it can be concluded that there must be a policy from the government to develop digital economy-based tourism in Lombok so that the community's economy increases.
The impact of the Russia-Ukraine war on the European Union economy
Authors: Darmayadi Andrias , Megits Nikolay
Published: January 2023

This study aims to see the impact of the Russo-Ukrainian war on the European Union economy. It uses a qualitative descriptive method. This method answers research questions requiring an explanation and understanding of social activities due to the war. In this descriptive research, we evaluate aimed to evaluate the impact of the Russo-Ukrainian War on the European Union Economy. The results of this study indicate that the European Union's economy was greatly affected by this war, starting from the disruption of trade relations between Russia and the European Union in all fields, especially in the energy sector, to the creation of high inflation rates in developing countries. With this, of course, the economy and stability in the European Union will be interrupted and causing an economic crisis in many European countries.
Mitos Air Pancuran Tujuh dalam Pandangan Masyarakat di Lingkungan Makam Raden Wangsa Muhammad Desa Cinunuk Kabupaten Garut
Authors: Rahadianti Ayu
Published: January 2023

Mitos air pancuran tujuh diwariskan secara lisan dari generasi ke generasi oleh masyarakat Desa Cinunuk dan sekitarnya. Air pancuran tujuh ini dimaknai oleh masyarakat serta pengunjung bahwa air pancuran tujuh ini memiliki nilai kesakralan dan khasiatnya tersendiri. Masyarakat yang datang untuk mengunjungi air pancuran tujuh sangat beragam baik itu dilihat dari berbagai aspek. Masyarakat itu memiliki cara pandang yang berbeda-beda maka penulis tertarik untuk melakukan penelitian tersebut. Tujuan dilakukannya penelitian ini untuk mengemukakan makna yang terdapat pada khasiat mitos air pancuran tujuh, serta untuk mengetahui pandangan masyarakat terhadap mitos air pancuran tujuh ini. Metode yang digunakan dalam penelitian ini yaitu metode deskriptif kualitatif. Hasil penelitian yang didapatkan bahwa khasiat mitos air pancuran tujuh mempunyai makna tersendiri bagi para pengunjungnya seperti sebagai ucapan rasa syukur kepada yang maha kuasa, dalam agama islam ada tujuh tingkatan langit, merupakan peringatan hari kelahiran nabi Muhammad, merupakan air yang suci, serta untuk menjaga lingkungan. Pandangan masyarakat terhadap mitos air pancuran tujuh berbeda-beda diantaranya dapat menyembuhkan penyakit, memperlancar rezeki, penyucian benda pusaka, memperlancar usaha, kekuasaan Allah, sebagai suatu ikhtiar untuk mendapatkan jodoh, membersihkan kotoran di dalam diri, mengambil keberkahan, dan dijauhkan dari makhluk halus.