bluuebunny/crossref_metadata_2025 huggingface dataset:
Dosimetry in targeted alpha therapy. A systematic review: current findings and what is needed
Authors: Tronchin Stephen , Forster Jake C , Hickson Kevin , Bezak Eva
Published: March 2022

Objective. A systematic review of dosimetry in Targeted Alpha Therapy (TAT) has been performed, identifying the common issues. Approach. The systematic review was performed in accordance with the PRISMA guidelines, and the literature was searched using the Scopus and PubMed databases. Main results. From the systematic review, three key points should be considered when performing dosimetry in TAT. (1) Biodistribution/Biokinetics: the accuracy of the biodistribution data is a limit to accurate dosimetry in TAT. The biodistribution of alpha-emitting radionuclides throughout the body is difficult to image directly, with surrogate radionuclide imaging, blood/faecal sampling, and animal studies able to provide information. (2) Daughter radionuclides: the decay energy of the alpha-emissions is sufficient to break the bond to the targeting vector, resulting in a release of free daughter radionuclides in the body. Accounting for daughter radionuclide migration is essential. (3) Small-scale dosimetry and microdosimetry: due to the short path length and heterogeneous distribution of alpha-emitters at the target site, small-scale/microdosimetry are important to account for the non-uniform dose distribution in a target region, organ or cell and for assessing the biological effect of alpha-particle radiation. Significance. TAT is a form of cancer treatment capable of delivering a highly localised dose to the tumour environment while sparing the surrounding healthy tissue. Dosimetry is an important part of treatment planning and follow up. Being able to accurately predict the radiation dose to the target region and healthy organs could guide the optimal prescribed activity. Detailed dosimetry models accounting for the three points mentioned above will help give confidence in and guide the clinical application of alpha-emitting radionuclides in targeted cancer therapy.
Suppression of fast neutrino flavor conversions occurring at large distances in core-collapse supernovae
Authors: Abbar Sajad , Capozzi Francesco
Published: March 2022

Neutrinos propagating in dense neutrino media
such as core-collapse supernovae
and neutron star merger remnants
can experience the so-called fast flavor
conversions on scales
much shorter than those expected in vacuum. A very generic class of fast flavor instabilities is the ones which are produced by the backward scattering
of neutrinos off the nuclei at relatively large distances from the supernova core.
In this study we demonstrate that despite their ubiquity, such fast instabilities are unlikely
to cause significant flavor conversions
if the population of neutrinos in the backward direction is not large enough.
Indeed, the scattering-induced instabilities can mostly impact the
neutrinos traveling in the backward direction, which represent only a small fraction of neutrinos at large radii.
We show that this can be explained by the shape
of the unstable flavor eigenstates, which can be extremely peaked at the backward angles.
Electromagnetic form factors of neutron and neutral hyperons in the oscillating point of view *
Authors: Dai An-Xin , Li Zhong-Yi , Chang Lei , Xie Ju-Jun
Published: March 2022

Based on the recent precise measurements by the BESIII collaboration for electron–positron annihilation into a neutron and antineutron pair, the effective form factors of the neutron were determined in the time-like region, and it was found that the effective form factors of the neutron are smaller than those of the proton. The effective form factors of the neutron show a periodic behaviour, similar to those of the proton. Here, a comparative analysis for Λ,

and

hyperons is performed. Fits of the available data on the effective form factors of Λ,

and

with zero charge show an interesting phenomenon in the oscillating behavior of their effective form factors. However, this will need to be confirmed by future precise experiments. Both theoretical and experimental investigations of this phenomenon can shed light on the reaction mechanisms of the electron–positron annihilation processes.
The Evolution of the Nucleus Surface in the Context of the Change in the Brightness of a Comet*
Authors: Wesołowski Marcin
Published: March 2022

The paper presents a model of the thermodynamic evolution of the comet nucleus surface. In the proposed approach, we focus on the analysis of the formation of pits visible on the surface of the cometary nucleus. These pits are a consequence of the thermodynamic evolution of both the surface layers and the inner layers of the cometary nucleus. As a result of complex thermodynamic processes, the surface layer is destroyed. A measure of this destruction is the amount of comet material that is thrown into a coma as a result of sublimation. The effect of this process is an increase in the area on which the incident light scatters. Then we can notice a sudden increase in the brightness of the comet, i.e., its outburst. A measure of the amplitude of a given outburst is the diameter and thickness of the surface layer that has been destroyed. The mechanism of the evolution of the pits was proposed based on the analysis of many photos taken by the Rosetta probe. The obtained numerical values correspond to the actual brightness changes of the Jupiter family comets during their outburst.
Signal processing of simplicial complexes
Authors: Chukanov S N
Published: March 2022

The paper considered the signal processing of simplicial complexes. Hodge decomposition formula for discrete fields is given, which is similar to the Hodge decomposition formula for smooth vector fields. The construction and the estimation of the gradient, divergence and curl operators and Laplace matrices for discrete vector fields are considered.
Comparison the effectiveness two methods: of the spanning trees sampling method and method Rand-ESU
Authors: Gam A V
Published: March 2022

Calculation of the cutoff probability in the Rand-ESU method. Identification of weak points of the method through the random sampling of spanning trees, also the Rand-ESU method with has implemented in the igraph library. Implemented in library igraph. Comparison of methods for counting subgraphs at four vertices. Prospects for the development of the spanning tree sampling method.
Mechanical Properties Degradation Modeling of Austenitic Chromium-Nickel AISI 304 Steel After Thermal Ageing
Authors: Margolin B Z , Petrov S N , Prokoshev O Yu , Kondrateva A M
Published: March 2022

Austenitic chromium-nickel steel AISI 304 is used as a structural material for heat exchange equipment. Long-term operations result in degradation of mechanical properties of material due to formation of chromium carbides at grain boundaries. The influence of various thermal ageing modes of AISI 304 steel on mechanical properties with metal fragments of reactor plant on fast neutrons of RP BN-600 taken as an example after long-term operation has been investigated.
Building and training a fuzzy neural model of data mining tasks
Authors: Muhamediyeva D T
Published: March 2022

In this paper discussed the problem of constructing and training a fuzzy neural network based on fuzzy logical rules. Based on the constructed model, the developed algorithm, the objects classified with indistinct initial information. Under these conditions, traditional methods of mathematical statistics or simulation modeling do not allow building adequate models for solving data mining problems. We consider the solution of problems based on the use of intelligent modeling technologies using methods of neural networks and fuzzy logic in order to automate the construction of fuzzy rules based on methods and algorithms of machine learning.
Application of data mining methods in solving medical problems
Authors: Muhamediyeva D K , Ruzibaev O B , Baxromova Yu
Published: March 2022

Mathematical methods in medicine - the criteria for determining the status of research objects related to medicine and health problems, methods and algorithms for assessing, analyzing and forming a set of quantitative variables are analyzed. Because of the analysis, problems and tasks were identified that need to be addressed.
Flow management in optimal resource exchange tasks
Authors: Nartov B K , Poluyanov A N
Published: March 2022

The paper presents a method for optimal initial allocation of resources of a dynamical system and reallocation of resources at the control interval. The main types of practical tasks on the exchange of material, energy and information resources are considered. A general scheme is given for their formalization using a special extension of the dynamical system of the original problem. The results of verification simulation experiments are presented.
Application of neural network language models based on distributive semantics for ontological modeling of the domain
Authors: Shishaev M G , Dikovitsky V V , Pimeshkov V K
Published: March 2022

The article discusses the technology of automated formation of SKOS-ontologies for semantic modeling of the subject area, based on natural language texts analysis. The technology is based on neural network and distributive (vector) language models. A brief description of the content and formulation of the problem of extracting concepts and relations from natural language texts is given, the results of constructing a neural network classifier of SKOS relations using the Glove vector model, as well as an example of using the technology to construct a fragment of an applied SKOS ontology are given.
Numerical simulation of heat-transfer fluid warm-up in heating facilities with heat transfer augmentation achieved with swirling flow
Authors: Zakharov Y N , Stukolov S V
Published: March 2022

Swirling flow of heat transfer fluid in heating facilities is a compelling way to intensify heat transfer augmentation. The paper considers the process of passive swirling flow in heating pipes by way of application of special design pipe connectors. Numerical simulation has been accomplished on the basis of viscous incompressible fluid model represented by Navier-Stokes equations complemented with temperature transfer equation. Numerical experiments has been completed with the help of applied software OpenFOAM based on finite volume method.
The analysis of the deposits formation on the working surfaces of heat exchange industrial equipment
Authors: Batrakov P A , Lasitsa A M , Peshko M S , Averchenko A P
Published: March 2022

The article considers the processes of deposits formation on the walls of heat exchangers. Experimental studies of the composition and structure of deposits in heat exchange equipment elements are carried out. The regularities of deposition are studied. The possibility of virtualization of deposits monitoring sensors is analyzed. The conclusion is made about the possibility of analytical prediction of the behavior of heat exchange equipment during the deposition and their influence on the heat transfer process. A partial replacement of experimental physical and chemical studies by simulation is proposed.
On Investigation of Crisp Bi-Objective Formulations for Fuzzy Traveling Salesman Problem and Fuzzy p-Median Problem
Authors: Zakharov Aleksey O. , Zakharova Yulia V.
Published: March 2022

We consider two classic problems: the Traveling Salesman Problem and the p-Median Problem. In both problems the total traveling cost (in some sense) is minimized, assuming that all traveling times are known. In most real-word applications the input data are uncertain, and this fact should be taken into account when a solution is constructed. In this paper we investigate bi-objective versions of the problems, where the total cost and fuzzy uncertainty associated with the traveling times (membership function) are optimized. A greedy approximation algorithm is proposed and experimentally tested on instances from TSPLIB library.
Improving the quality of modeling thermodynamic processes
Authors: Brazhnikova K
Published: March 2022

On the example of modeling thermodynamic processes occurring in the on-board gasification system (OGS) of unprocessed liquid fuel residues in the tanks of the launch vehicle stage (LV), using a reduced physical model of the fuel tank – an experimental model installation (EMI) as part of an experimental stand (ES), the design parameters of which are determined (geometric parameters, coolant and characteristics of the model fluid) based on the theory of similarity of thermophysical processes occurring in the real design of the fuel tank of the LV stage according to the criteria of Reynolds, Nusselt, Prandtl, methodological recommendations are proposed to improve the quality of the process of theoretical and experimental research at the stage of scientific research (R&D).
Friction stir processing as a method of hardening cutting tools
Authors: Chernykh I K , Vasil’ev E V , Badamshin A M , Kushnareva A G
Published: March 2022

One of the most perspective methods of hardening is friction stir processing. The study shows processing methods based on the friction stir principle. The results of hardening of tool steels 1089 (Fe97%, C0.8%), 3343 (Fe80%, C0.9%, Cr4%, Mo5%, W6%, V2%), 440C (Fe78%, Cr18%, C0.95%) are presented. As a result of hardening, it was possible to increase the microhardness of carbon tool steel by more than 3 times, and also to achieve a decrease in the average grain size in the treated area by more than 10 times in relation to the base material. It is proposed to use the FSP in the manufacture of cutting tools from tool steels to increase physical and mechanical properties.
Improving the quality and efficiency of friction stir welding of aluminum alloy plates
Authors: Chernykh I K , Vasil’ev E V , Kushnareva A G , Krivonos E V
Published: March 2022

Friction stir welding (FSW) is best suited for welding large-sized aluminum alloy parts. Finding optimal welding conditions and methods for minimizing defects arising during welding is an urgent task, the solution of which is necessary for the commissioning of FSW technology into the industry. The introduction of this method for welding rocket fuel tanks will increase the productivity of manufacturing products and their strength. The aim of this study is to improve the quality of friction stir welding of 7,6 mm thick Al-Mg6% aluminum alloys, as well as to increase productivity. The aim is achieved by finding optimal welding conditions and modernizing the welding method for simultaneous stripping by milling. The optimal welding modes found as a result of the study allow ensuring the strength of the welded joint, reaching 98% of the strength of the base material. The modernized welding method allows milling (deburring) to be carried out simultaneously with welding, which can significantly reduce the manufacturing time of the product, for which deburring is a necessary operation. As a result of the study, the welding modes were also revealed, leading to the appearance of hidden defects, which can reduce the strength of the welded joint by 2 times. A conditional diagram showing the appearance of defects in various combinations of modes has been compiled.
Fire detection system call points types selection based on the gas and smoke environment physical parameters dynamic study in different premises
Authors: Khrapskii S F , Bedrina E A
Published: March 2022

Fire detection system call points types selection is determined by the gas-smoke environment prevailing physical parameter in fire case and by this parameter change dynamic as combustion develops. Obtaining of practically important information about the gas-smoke environment prevailing parameters during a fire, their changes dynamic and the time when they reach the threshold values for call points for real objects is possible on the numerical studies results basis using the FDS program complex modeling heat and mass transfer and gas dynamic processes occurring during a fire. The performed calculations made it possible to obtain the temperature dependences, smoke optical density and carbon monoxide concentration in the near-ceiling area on time since the ignition start for a number of characteristic rooms for various purposes. The call points type choosing ambiguity for rooms with different fire load indicators is shown. The calculated data can serve as a basis for choosing the fire detection system call points types, as well as for setting up and effective functioning of multi-sensor and multi-criteria fire detectors.
Non-Linear Oscillations of the Channel Wall Filled with a Viscous Liquid Induced by the Vibrating Foundation
Authors: Popov V S , Popova A A , Christoforova A V
Published: March 2022

The paper considers the issues of mathematical modelling nonlinear vibrations for the wall of a narrow parallel walled channel filled with a viscous incompressible liquid. The upper channel wall is a rigid rectangular plate supported by nonlinear spring with a cubic restoring force, while the bottom one is a fixed rigid rectangular plate. The case of nonlinear oscillations of the upper channel wall due to channel’s foundation vibration has been investigated in the frame of hydroelasticity problem. The main attention is paid to the consideration of steady-state nonlinear oscillations for the upper channel wall and the creeping motion of the liquid in the channel. The liquid layer reaction acting on the upper channel wall is found and the channel’s wall nonlinear oscillation equation is obtained taking into account the energy dissipation due to the liquid viscosity. It was shown that this equation coincided with the Duffing one. The solution of the nonlinear oscillation equation was carried out by the harmonic balance method. Based on the found solution, the hydroelastic response of the channel wall on a nonlinear elastic suspension to the channel foundation vibration was determined.
Efficiency of the use of feedback in the stabilization of motion of the rotary hydraulic drive
Authors: Syrkin V V , Galuza Yu F , Kvasov I N , Abramova I A
Published: March 2022

This article reflects a study of the operation of a hydraulic drive with nonlinear characteristics of an axial piston hydraulic motor, which operates at the lower limit of the speeds of the executive bodies. A nonlinear frictional moment arises in the end valve of the hydraulic motor connected to the actuator and leads to movement with stops. The mathematical models of the dynamics of the hydraulic drive, proposed in this study, are linearized by the method of harmonic linearization and allow engineering calculations of the parameters of the modes of non-stop motion. Evaluation of the dynamic properties of the hydraulic drive, corresponding to the onset of an unstable mode, makes it possible to determine the minimum value of the constant component of the speed of the executive body.
Modeling and Analysis of Delta Kinematics FDM Printer
Authors: Zakharov O V , Pugin K G , Ivanova T N
Published: March 2022

Additive manufacturing makes it possible to speed up the process of manufacturing a product using a CAD model many times over. This advantage is effectively used in the manufacture of small batches of products with complex surfaces in the automotive and aviation industries. Improvements in printers are needed to improve accuracy and productivity. Traditionally, delta kinematics are considered to have advantages over sequential linear kinematics due to their high travel speed and relatively low cost. However, delta kinematics has received limited application, mainly for personal FDM printers. The article attempts to understand the advantages and disadvantages of delta kinematics for use in 3D printers. For this, the displacements and velocities were simulated for four examples of motion trajectories. The analysis showed that the average speed of movement of the extruder is approximately equal to, and in some cases less than the linear speeds of movements along the rods. At the same time, to ensure a uniform speed of the extruder, significant accelerations are required along the individual rods. This leads to vibrations and ultimately limits the maximum speeds.
Investigation of a Mechanism of Structural Transformations in High-Strength Steel
Authors: Fedoseev M L , Petrov S N , Mikhaylov M S , Islamov A Kh , Ryabov V V
Published: March 2022

Mechanical, technological and operational properties of metal materials are largely influenced by changes of concentrations, morphology, dimensions, localization, elemental and phase composition of dispersed precipitates. This paper is devoted to a study of dispersed carbides of submicron size at tempering of high-strength medium-carbon steel. The main emphasis is on comparing the data obtained by small-angle neutron scattering and transmission electron microscopy. As a result of the analysis, it was found that carbide growth begins in the investigated steel immediately after quenching when the tempering temperature increases. First, it is fixed by a transmission electron microscopy and a small-angle neutron scattering and then above ~ 300 ° C carbide growth is fixed by neutron diffraction. The residual austenite is also completely dissolved by the time the temperature reaches ~ 300 °C. A good matching has been reached for the methods used. It has been shown that a complex use of integral and local methods allows to obtain fully information about the structure and properties of the investigated material.
Investigation of Ti/TiB2Composite Wear Resistance and Corrosion Resistance Coatings in Aggressive Medium and at Variable Temperatures
Authors: Goshkoderya M E , Bobkova T I , Belyakov A N , Yakovleva N V
Published: March 2022

The present work investigates the influence of conditions like the climate of the Arctic shelf, such as aggressive medium, hydroabrasive wear and variable temperatures on Ti/TiB2composite coatings. The applicable composite powders were investigated with the use of thermogravimetric analysis. The values of corrosion resistance and wear resistance of the coatings were also investigated.
Phase diagrams of the terminating oxygen layer on MXenes M2CO sheets (M = Ti, V, Nb)
Authors: Kayumova T R , Myshlyavtsev A V , Stishenko P V
Published: March 2022

In this work we have studied the behavior of oxygen adsorbed on the MXenes M2CO (M=Ti, V, Nb) surface by the density functional theory and Monte Carlo methods. An approximation for the lateral interactions potential has been constructed that has the form of a pair potential. We have carried out the quantitative assessment of the errors of the pair potential. Using SuSMoST program we have constructed isotherms of adsorption. The results showed a non-trivial phase behavior of the adlayer: we observed three phases characterized by the 1/3, 1/2 and 2/3 coverage. It has been predicted that complete oxygen removal from the MXenes surface is possible at temperatures above 500 K.
Microhardness and wear resistance of a high-entropy coating FeCrNiTiZrAl
Authors: Yurov V M , Eremin E N , Guchenko S A
Published: March 2022

In this article, the microhardness and wear resistance of the high-entropy FeCrNiTiZrAl alloy are studied on model specimens and on turbine blades made of 20Kh13 steel. The alloy was made by mechanical alloying and subsequent annealing in a vacuum furnace. The study showed that the obtained alloy is a high-entropy alloy with a microhardness μ = 740 HV, which is at the level of the microhardness of metallic glasses, but 2-3 times higher than the microhardness of stainless steels. The friction coefficient of the FeCrNiTiZrAl coating is k = 0.06, which is 10 times less than the friction coefficient of the titanium nitride coating (k = 0.65). The wear resistance of the high-entropy FeCrNiTiZrAl coating is much higher than that of stainless steels, and it leads to the fact that the cost of titanium nitride coating on turbine blades is 2 times higher than the cost of FeCrNiTiZrAl coating, that is, the economic effect is obvious.
The structure and magnetic parameters of the Fe-Cr-Co additive alloy
Authors: Zhukov A S , Sozinov D S , Ushanova E A , Gavrikov I S
Published: March 2022

The structure of Fe-Cr-Co magnetic material, manufactured by selective laser melting (SLM) on RussianSLM FACTORY unit from spherical powder of size less than 80 μm, was studied. The powder was produced by the melt atomization. At different speeds of scanning and laser power, samples were manufactured to study the structure, magnetic and mechanical parameters. By constructing hysteresis loops, data obtained indicating the growth of magnetic characteristics (Br, Hcb and (BH)max) in SLM samples in comparison with similar, obtained by foundry technologies.
Key pre-distribution scheme over the continuous periodic functions space
Authors: Belim S V , Belim S Yu
Published: March 2022

Implementation for the key preliminary distribution scheme in the continuous functions space is proposed. Key materials are formed based on linear differential operator. User characteristics are presented in the form of a harmonic series. We show that this approach allows you to develop a common encryption key. A linear differential operator is formed only from even order derivatives. Odd order derivatives do not affect the encryption key value.
Research of the Optical Fibers Structure Influence on the Acousto-Optic Interaction Characteristics and the Brillouin Scattering Spectrum Profile
Authors: Bogachkov I V , Gorlov N I
Published: March 2022

The research results of the structure influence of single-mode optical fibers of various types on the interaction characteristics of the optic and acoustical modes of lower orders are presented in this work. A method for obtaining of optic and acoustical modes distribution in single-mode optic fibers is considered. The structures of the radial distribution of refractive index profiles for some varieties of single-mode optical fibers with dispersion shift (ITU–T recommendation G.653 and G.653) are presented. The obtained graphs for varieties of optical fibers are presented.
Numerical modeling of the Brownian motion in a bistable potential at medium friction
Authors: Chushnyakova M V , Gontchar I I , Kulik E V , Churankin V G
Published: March 2022

We present results of the numerical modeling of the relaxation process for the Brownian motion in a bistable potential. Such a process is relevant for the recent nanoscale experiments reported in the literature. The modeling is based on the Langevin equations for the generalized coordinate and its conjugated momentum. First, the calculations are validated for the case of low thermal energy using a comparison with the analytical expressions for the harmonic oscillator. Next, the time evolution of the particle distribution in the bistable potential is analyzed.
Python as an automation tool in IS. Monitoring the relevance of protection against malicious code
Authors: Dronov V Y , Dronova G A
Published: March 2022

One of the necessary, periodically performed by information security (IS) department procedures is to assess the level of compliance of the actual state of any IS measure with the established requirements. These procedures involve a significant amount of manual work, which leads to a waste of time, human, technological resources. In this case it is not always possible to provide a high level of reliability of the results. To reduce costs, increase the degree of reliability and accuracy of the results of assessment of the IS state, and, accordingly, increase the level of confidence in the IS state assessment, it is possible by the use of “small automation” means when performing routine operations of collection, correlation, normalization, analysis of data sets. The most acceptable means of automation is the programming language python, which, in addition to convenience of use, powerful functionality, has an extensive analytical apparatus. This article discusses the use of python as a “small automation” tool for monitoring the relevance of antivirus protection system.
Principles of information security management system
Authors: Dronov V Y , Dronova G A
Published: March 2022

The main element of a complex system that determines its performance and efficiency is its management system. Modern management systems are widely used, including in the management of teams of people united by common goals (organizations, departments, groups of developers, etc.). Information security is no exception - it is not enough to saturate the division responsible for information technology security with personnel, technical systems of information protection, it is necessary to ensure the effectiveness in achieving the goals, which is not possible without an appropriate management system. Information security specialists in organizations of various forms of ownership often face the problem of ensuring effective and efficient protection of information assets. Availability of international and national standards, regulatory documents of regulators does not ensure the achievement of high performance and efficiency indicators. The achievability of these indicators is determined by setting and achieving a number of goals, based on certain strategic principles of information security management system.
Python as an automation tool in IS. Protecting Database Access in Python
Authors: Dronov V Y , Dronova G A
Published: March 2022

The activity of modern organizations, regardless of the form of ownership, is highly risky. There are up to 600 risk factors in total. It is possible to reduce risk levels only after assessing them. The basis of risk assessment is analytical processing of information relating to the sphere of organization’s activity. The information to be analyzed is usually accumulated in databases. This information is usually accessed with SQL queries and analyzed with application software. The most rational variant is when the business unit employees are able to select the data from the database and perform their analytics independently. The most convenient, both for sampling information from databases, and for its analysis to use python. However, python, which is an interpreted language, has a disadvantage in terms of information security - access parameters, including user login and password, database connection parameters, are located in the program body in clear form. The option proposed in this article allows you to reduce the risks of privacy violation when accessing the database.
Investigate the impact of user’s state on the quality of authentication by keystroke dynamic
Authors: Panfilova I E , Karpova N E
Published: March 2022

One of the most important issues in the field of information security has been and remains the issue a reliable user’s authentication. A special place among the possible authentication methods today is occupied by behavioural biometrics, which have a high degree of reliability. A keystroke dynamic, as a type of behavioural biometrics, is also capable of providing a high level of protection of information systems in the case of correctly selected characteristics. This article shows that external factors, including the psychophysiological state of a person, can also influence the authentication process by keystroke dynamics. In the paper, the state of the user was assessed in the process of collecting a sample of keystroke dynamics and a conclusion was made about the presence of such an influence.
Software implementation of the information model of the peripheral auditory system for assessing speech intelligibility
Authors: Rozhkov S A , Savinykh M A , Trushin V A
Published: March 2022

The paper considers the features of constructing an information model of the human peripheral auditory system in the LabVIEW software environment. A brief description of the adopted information model proposed for implementation in the software environment is given. Detailed explanations are described for each element of the model made in the LabVIEW environment. The main functionality of the user part of the program is presented. The work is, in fact, staged in nature and offers a sequence of further necessary studies of the developed model.
Steganalysis for LSB inserts in low stego-payload artificial color images
Authors: Vilkhovskiy D E
Published: March 2022

In this study a new method of steganalysis is presented for detecting and locating a hidden message embedded using LSB replacement as a steganography algorithm. The method is applied for analysing artificial color images of a gradient fill and shows high detection and locating accuracy in low stego-payload of 25 to 10 percentage. The method is based on analysing pixel combinations of an LSB map to classify unique and non-unique pixel combinations and finding the largest rectangle algorithm for, respectively, detecting and locating purposes. To exclude noisy data from further consideration, a pre-processing filter is developed and presented.
Secure System for Remote Telemonitoring of Patients with Chronic Forms of Heart Disease
Authors: Zakharov A A , Olennikov E A , Olennikov A A , Pausova T I
Published: March 2022

This paper considers modern technologies of home telemonitoring related to CPC patients. It presents a new secure intellectual telemedicine service based on remote monitoring of patients’ health status, which can be used for CPS patients for their health screenings in remote and hard-to-reach locations, as well as in-house hospitals. It also discusses technologies, problems and prospects of remote telemonitoring systems’ development and implementation.
Preface
Authors: Oganyan N G
Published: March 2022

«…to progress the state of the art of chemical and biological measurement science and act as a forum for the exchange of information about measurement research, technical programs and service delivery…»

Consultative Committee for Amount of Substance; Metrology in Chemistry and Biology (CCQM): Strategy Document (2021-2030)

Today, more than ever, the problems of ensuring international traceability in the field of physicochemical measurements, both for science and production, and for monitoring the quality and safety of life, are relevant. The concept of “measured once, accepted everywhere” has become a cornerstone for metrologists over the world. To implement this concept, metrological institutes hold conferences, seminars, forums and other events providing participants with the opportunity to receive information about new achievements, exchange experience between laboratories and identify problems arisen in practice.

List of Images, Acknowledgements, Program Committee are available in this pdf.
Development of metrological support for nucleic acid measurements
Authors: Vonsky M S , Runov A L
Published: March 2022

Measurements of nucleic acid have become an essential part of analytical applications in many fields including life science, medicine, veterinary medicine and biotechnology. Peculiarities of these measurements are largely determined by the uniqueness of quantity and analyte definitions. Quantitative PCR, applied for routine nucleic acids measurements, is a relative method demanding external calibrators with quantity values traceable to corresponding reference materials. Direct nucleic acid measurements became possible after introduction of the digital PCR (dPCR) method. Ensuring accurate, comparable and traceable to SI nucleic acids measurements is the focus of Nucleic Acid Analysis Working Group of the Consultative Committee for Amount of Substance: Metrology in Chemistry and Biology. A number of pilot and key comparisons carried out by Working Group have shown that application of dPCR allows participating National Metrological Institutes to obtain comparable results of measurements of the sequence copy number concentrations and copy number ratios.
Creation of and first meeting of the new ISO technical committee for reference materials (ISO/TC 334)
Authors: Botha A
Published: March 2022

On 14 December 2020, the ISO Technical Management Board (TMB) took the decision to transform ISO/REMCO, the ISO Committee for Reference Materials, and to create a new technical committee (ISO/TC 334). The main reason for this decision was to facilitate the transformation of the ISO/REMCO Guides, developed for the production and use of reference materials, into other ISO deliverables, most probably international standards. The inaugural meeting of the committee took place on 8 and 9 September 2021 and the resolutions from the first meeting was approved at a subsequent meeting on 16 November 2021. The most important decisions that were taken during this meeting included the approval of the title and scope of work of the committee and the plan of action for the transformation of the ISO/REMCO Guides into international ISO standards.
Characterization of oxyanions of chlorine by multipath titrimetric approach for drinking water quality control
Authors: Asakai Toshiaki
Published: March 2022

The analysis of oxyanions, perchlorate, chlorate, chlorite and hypochlorite ions, is of interest, especially from the viewpoint of evaluating drinking water quality. Instrumental analyses are generally performed to quantify them, and require a standard solution of corresponding ions; however, no standard solutions characterized by a metrologically valid procedure have existed. In the present study, perchlorate, chlorate and chlorite ions were characterized by performing multipath titration techniques. This technique is an approach to determine the amount of substances in chemicals by employing different stoichiometric reactions. It has decreased the risk and the contribution of unknown biases that each measurement method has, and gives further reliable results than those based on a conventional single titration method. The comprehensive evaluation of the measurement uncertainties for these assays was carried out, resulting in the establishment of the measurement methodologies for oxyanion standards.
About the development of metrological assurance for identification, detection, and quantitative determination of the composition components of meat products
Authors: Studenok VV , Medvedevskykh MY , Sergeyeva A , Vostrikova NL , Minaev M Y
Published: March 2022

The article presents the research results that formed the basis for the development of a complex for metrological assurance of the qPCR method in the food industry that meets the legal requirements in the field of measurement uniformity assurance. The complex includes the CRM for chicken meat composition (MП-2-3 CO Gallus gallus), a certified measurement procedure that has confirmed its applicability for samples of meat and meat-containing products, including those subjected to heat treatment (except for canned meat). The perspective directions for the development of a complex for metrological assurance of the qPCR method in the food industry are considered.
Possibilities of FSUE “VNIIFTRI” for the manufacture and calibration of special measures of radionuclide activity for metrological support of measurements of radionuclide activity during radiation monitoring
Authors: Dyachkova V G , Kraynova M D
Published: March 2022

Measuring the activity of radionuclides is one of the most popular directions in the field of ionizing radiation measurements. The fact that ensuring the unity and reliability of measurements of the activity of radionuclides is the most important task is obvious. Radionuclide sources of ionizing radiation for metrological purposes are necessary for the calibration and graduation of radiometers and spectrometers and are also used as control sources. VNIIFTRI develops and manufactures various types of metrological sources: point sources, surface sources, simulators of radioactively contaminated environmental objects, which, in turn, are divided into solid-state and bulk sources. The use of these sources avoids a significant increase in the error of measuring instruments.
Covariances in the variance of integral estimates of the contents of components of the substances’ composition in industrial quantities
Authors: Medvedevskikh S V , Aronov P M , Firsanov V A
Published: March 2022

The paper considers problem of estimating the integral content of components of chemical composition of substances and materials in the tasks of control, recording and monitoring of their production, generation of waste, emissions and discharges in industrial-scale volumes at the given volume and mass of a substance (material) at certain time moments or intervals, based on mean estimates. The importance of taking correlations in the data into account for the correct estimation of the uncertainty of the mean is illustrated.
Metal analysis in rice flour
Authors: Stakheev A A , Stolboushkina T P
Published: March 2022

The principal goal of present work was to develop a precise method of Inductively Coupled Plasma Mass Spectrometry (ICP-MS) method to measure trace toxic elements (Cd and Pb) and Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) method to measure macro and micro elements (K and Cu respectively) in rice flour, the sample preparation method using a system for microwave-assisted pressure digestion and the preparation of laboratory plasticware. The parameters of the sample preparation method, of the spectrometers and measurement results are given.
Occupational standards application when building up the modern professional metrologist competences
Authors: Konopelko L A , Okrepilov M V , Mosichkina A V , Paliy O I
Published: March 2022

This article develops the issues of building up the federal state educational standards, major professional academic programs for specialists in the field of metrology, taking into account occupational standards. The regulatory documents characterizing the metrology specialists activities have been analyzed. A structure to build up an occupational standards system in the field of metrology has been put forward.
Characterization of particles of the dispersed system based on low-concentrated aqueous solutions of L-cysteine and silver acetate
Authors: Averkin D V , Stakheev A A , Vishnevetskii D V , Pakhomov P M
Published: March 2022

The authors of this work conducting a study of the precursor of reference materials of the zeta potential of particles in dispersed systems. The precursor is based on supramolecular solution of L-cysteine and silver acetate (CSSac). Particles and aggregates of CSSac were studied by dynamic light scattering (DLS), phase analysis of scattered radiation (PALS), inductively coupled plasma mass spectrometry (ICP-MS) and high-resolution transmission electron microscopy (HR-TEM). It was established that the diameter of the potential-determining aggregates of the CSSac is in the range from 20 nm to 100 nm. These aggregates consist of nanoparticles up to 10 nm in diameter.
Ambient air quality measurements in a large city: existing solutions, new opportunities and challenges
Authors: Lezina Elena , Misyurev Mikhail
Published: March 2022

The city of Moscow has been actively introducing advanced technologies in the field of pollution control in real time. At the same time, Russian legislation often lags behind modern trends. The article discusses the issues of introducing reference and equivalent measurement methods and the problem of introducing small-sized instruments (low-cost sensors) for monitoring atmospheric air pollution. The article presents preliminary results of large-scale tests of low-cost sensors in comparison with traditional measurement methods, which were carried out by the State Environmental Protection Institution "Mosecomonitoring".
Research on real-time scanning reconstruction control technology of 3D scene
Authors: Du Wenbo , Li Xingxing , Jiang Li , Lv Fei , Hu Chang’an
Published: March 2022

With the rapid development of society, the acquisition of basic data of many large engineering projects such as factories, power plants and large cultural relics protection has become an essential and valuable resource for reconstruction and expansion. However, the traditional method has many constraints such as large amount of data, difficulty in collection, low security and impact on production. This paper USES the ground type 3D laser scanning equipment combined with a handheld laser scanning equipment, USES the multi-channel data fusion technology, from the control survey, point cloud data acquisition, data preprocessing, and other aspects, in complex factory data model as the research object, a detailed study of 3D scene real-time scanning reconstruction technology.
An Immersive Virtual Maintenance Simulation Process for Civil Aircraft Based on Cavernous Automatic Virtual System
Authors: Liang Ruoxi , Ye Qunfeng
Published: March 2022

This paper discusses the immersive virtual maintenance simulation in the design and verification phases of civil aircraft. Firstly, the concepts of maintainability design and Virtual maintenance are introduced. Secondly, the workflow of immersive Virtual maintenance simulation based on cavernous automatic virtual environment (CAVE) system for civil aircraft is discussed in detail. Through the computer virtual model to simulate and estimate the product maintainability and maintenance support system and other aspects of the possible problems, improve prediction and decision-making level, make maintainability design technology out of the dependence on experience, develop to a new stage of all-round prediction. Finally, the development trend of civil aircraft maintainability design and immersive virtual maintenance simulation method is discussed, and some suggestions on the research and application of this field are put forward.
Research on the Fault Diagnostic of the Aircraft Cross-Linking Systems
Authors: Ma Linlong
Published: March 2022

High complexity of modern civil aircraft system leads to a huge difficulty to its trouble-shooting. This paper firstly discussed the two main directions of improving the aircraft fault diagnosis capability, and then analysed the pain points encountered by the model-based troubleshooting method. For the pain points, the Colour Fuzzy Fault Petri Net (CFFPN) model was proposed. The basic principles of the model and the basic process of conducting forward and reverse reasoning diagnosis based on the model were illustrated. Then the application of reasoning process in system design integration and airline maintenance was expounded. Finally, a practical software prototype of the model was developed, and effectiveness of the method and model was demonstrated through applications in engineering practice.
Improving position resolution of neutron detectors with ultra-thin B4C foils
Authors: Duarte N.F.V. , Marcos J.S. , Antognini A. , Klauser C. , Felix S.A. , Monteiro C.M.B. , Amaro F.D.
Published: March 2022

A new technique for detection of slow neutrons with gaseous
detectors using ultra-thin layers with 10B atoms is
presented. The reaction between a thermal neutron and a 10B
atom releases two secondary particles, namely a 7Li ion and an
alpha particle, which due to momentum conservation are emitted in
opposite directions, along the same line (back to back). Current
boron coated neutron detectors are equipped with 10B films with
thicknesses of several micrometers, deposited on very thick
substrate plates. However, since the ranges of the 7Li ion and
the alpha particle are of few micrometeres in most materials, one of
these particles is always lost in the 10B layer or
substrate. As such, these detectors lose the ability to reconstruct
the reaction line of action and to precisely determine the neutron
position, as only one of the two secondary particles tracks can be
measured. With the technique now presented, the sum of the 10B
layer and the substrate thicknesses is small enough to allow for
both secondary particles to escape and ionize the gas in opposite
sides of the 10B converter foil. Independent readout
structures, one on each side of the 10B converter foil, detect
each secondary particle and determine its track centroid and the
deposited energy. Since the two secondary particles are emitted back
to back, the neutron position can be obtained by combining the
information recorded by the two readout structures. Through GEANT4
simulations, we verified that the spatial resolution can be
significantly improved: our results show that, by using a B4C
layer with a thickness of 1 μm on a 0.9 μm Mylar
substrate, the spatial resolution can by improved by a factor of
eight, compared to conventional detectors with thick 10B
detection layers.