bluuebunny/crossref_metadata_2025_split huggingface dataset:
Key comparison in the field of acceleration on low intensity shock sensitivity
Authors: Qiao Sun , Hongbo Hu , Ota Akihiro , Nozato Hideaki , Ripper Gustavo P , Muñiz Mendoza Lorenzo Marcos , Kozlyakovskiy Anton , Veldman Ian , Bruns Thomas , Dickinson Laurence , Lee Yong Bong 
Published: September 2019

This is the final report for CIPM key comparison CCAUV.V-K4 in the area of 'vibration' (quantity of acceleration). The aim of this comparison was to measure the voltage shock sensitivity of an accelerometer measuring chain including a standard accelerometer with a charge amplifier and the charge shock sensitivity of an accelerometer at different peak acceleration values with associated pulse durations. Nine Metrology Institutes from five RMOs have participated in the comparison with National Institute of Metrology, P.R. China as pilot lab and National Metrology Institute of Japan as co-pilot lab. For voltage shock sensitivity, all the participating laboratories provided their calibration results, which were all consistent within their declared expanded uncertainties. All participants contributed to the KCRVs calculated for six peak acceleration comparison values. For charge shock sensitivity, one participant failed to contribute to the calculation of the KCRV at 5 000 m/s2 and two participating laboratories were not consistent within their declared expanded uncertainties at a total of five peak acceleration comparison values. Further improvements of their calibration devices and uncertainty evaluations will provide more accurate and reliable measurement results in the future.
KEY WORDS FOR SEARCH
Key comparison; shock acceleration; low intensity shock

Main text

To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.
The final report has been peer-reviewed and approved for publication by the CCAUV, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Field-emission durability employing highly crystalline single-walled carbon nanotubes in a low vacuum with activated gas
Authors: Shimoi Norihiro , Tohji Kazuyuki 
Published: September 2019

Abstract
A new approach to improving power consumption and energy efficiency is to use a simple structure with highly crystalline single-walled carbon nanotubes (hc-SWCNTs) in the cathode. We succeeded in determining the efficacy and applicability of the field emission (FE) properties of hc-SWCNTs in a low vacuum below 0.1 Pa with activated gas. In particular, the FE of 1.0 mA cm−2 of hc-SWCNTs heated at 50 °C exhibits good stability for over 600 s in a low-vacuum atmosphere with oxygen added in a cathodic planar field emitter. The improved FE electrical properties of the hc-SWCNTs can likely be attributed to the increase in the crystallinity of the SWCNTs despite the low-vacuum atmosphere. It is further expected that the hc-SWCNT field emitters will be applicable to dry etching processes because single ionized molecules or radicals can be selectively synthesized with almost no energy loss and without requiring a cooling system. Our novel SWCNTs, as a component of a flat plane-emission device, may provide a technological breakthrough for realizing both energy saving and a low carbon environment in dry etching processes as well as in semiconductor industrial development.
The role of system–meter entanglement in controlling the resolution and decoherence of quantum measurements
Authors: Patekar Kartik , Hofmann Holger F 
Published: September 2019

Abstract
Measurement processes can be separated into an entangling interaction between the system and a meter and a subsequent readout of the meter state that does not involve any further interactions with the system. In the interval between these two stages, the system and the meter are in an entangled state that encodes all possible effects of the readout in the form of non-local quantum correlations between the system and the meter. Here, we show that the entanglement generated in the system–meter interaction expresses a fundamental relation between the amount of decoherence and the conditional probabilities that describe the resolution of the measurement. Specifically, the entanglement generated by the measurement interaction correlates both the target observable and the back-action effects on the system with sets of non-commuting physical properties in the meter. The choice of readout in the meter determines the trade-off between irreversible decoherence and measurement information by steering the system into a corresponding set of conditional output states. The Hilbert space algebra of entanglement ensures that the irreversible part of the decoherence is exactly equal to the Hellinger distance describing the resolution achieved in the measurement. We can thus demonstrate that the trade-off between measurement resolution and back-action is a fundamental property of the entanglement generated in measurement interactions.
On a numerical method for solving the hydrodynamic problem of underground leaching
Authors: Alimov I , Pirnazarova T , Kholmatova I 
Published: September 2019

Abstract
Hydrodynamic problem of the process of underground leaching in the planned statement in a horizontal section is considered in the paper. An algorithm for solving the problem based on the longitudinal-transverse scheme and the method of flow sweep is given. The reliability of the developed algorithm is verified by example.
Selection of features based on relationships
Authors: Mamatov N , Samijonov A , Yuldashev Z 
Published: September 2019

Abstract
At present the most popular criteria are of informative heuristic criteria associated with the estimation of separability given classes and based on the fundamental pattern recognition compactness hypothesis: with increasing distance between the classes improved their separability. “Good” are those features that maximize the relationship. Such heuristic criteria, although are widely used in solving practical problems of classification, but in theory are scarcely explored. At present, the method of selecting informative features, taking into account the relationships of features based on heuristic criteria, has not been developed. The report considers this task.
Nonlinear mathematical model for monitoring and predicting the process of transfer and diffusion of fine-dispersed aerosol particles in the atmosphere
Authors: Ravshanov N , Shafiev T R 
Published: September 2019

Abstract
Mathematical model for predicting, monitoring and assessing the ecological state of the atmosphere and underlying surface with passive and active impurities is developed in this article; it takes into account the varying rate of particle displacements in the atmosphere. To determine the rate of displacements of fine-dispersed particles in the atmosphere, a system of nonlinear equations has been obtained, which took into account such important factors as: the basic physical-mechanical properties of the particles and the rate of air mass in the atmosphere.
Quantitative study of the regulatory mechanisms of cardiac activity and liver function in pathogenesis
Authors: Saidalieva M , Hidirova M , Turgunov A , Yusupova Z 
Published: September 2019

Abstract
The article is devoted to investigate the dynamics of behavior of functional-differential equation with delay of mathematical model of the regulatory mechanisms of cardiac activity and liver function in pathogenesis. Moreover, the results of the computational experiment for the quantitative analysis of the object state are presented. The behavior of the system in the zone of dynamic chaos was analyzed with the use of developed software.
Reverse rotation stator of torque converter in automotive powertrain system
Authors: Yu Antsev V , Trushin N N 
Published: September 2019

Abstract
Global economy demonstrates a steady elevated demand for heavy mobile equipment for construction and mining enterprises. At the same time wheel loaders, the total annual world output of which is about 160-170 thousand units are in high demand. Many wheel buckets and forklifts are equipped with hydro-mechanical transmissions containing a torque converter and a manual gearbox with hydraulic control. The positive properties of self-regulating torque converters are particularly favorable for equipment operating under stress. The transmission is equipped with a gear due to insufficient transforming properties of the torque converter. In order to improve the dynamic properties of self-propelled machines, designers increase the number of stages in gearboxes. However, multi-stage boxes complicate the hydro-mechanical transmission and its control system. One of the ways to improve the hydro-mechanical gears of mobile machines is to fully utilize the motor and tractor torque converters by using the opposite rotation of the torque converter reactor in the forward and reverse modes of the transmission. The article discusses circuit solutions for a hydro-mechanical transmission with a single-stage torque converter without a multi-stage gearbox, intended for use in transmissions of wheeled transport and loading and other self-propelled machines.
Propagation of SH-waves in piezoelectric structures with functionally graded coating from different materials
Authors: Belyankova T I , Kalinchuk V V 
Published: September 2019

Abstract
The paper proposes an approach to model piezoelectric structures with a coating of various piezoelectric materials. The coating is a layer of functionally graded piezoelectric material, the properties of which continuously change from the parameters of one material to another. In contrast to the layered model with gaps in the change of properties at the interfaces of the materials, the proposed model implements the adjustment of the thickness of the coating of the transition zone of one material to another. The choice of functional dependences of the change in properties was determined by the ratio of the moduli of the materials that make up the coating, the localization of inclusions and the size of the area of mutual penetration of materials. The studies were carried out for piezoelectric structures made of ferroelectric materials based on PZT. In this paper, using the example of a model of coating by two and three piezoelectric materials, we studied the influence of the nature and localization of the inhomogeneity of the coating on the features of the propagation of surface shear horizontally polarized waves.
Burst pressure estimations of a composite pressure vessel accounting for the composite shell imperfections
Authors: Burov A E 
Published: September 2019

Abstract
The paper presents the numerical evaluation of the effect of possible imperfections on the burst strength of composite pressure vessel made by filament winding over a thin metallic liner. The damages and defects distributed over the composite volume that lead to deterioration of the mechanical properties or increase their scattering are considered. The burst pressure is predicted with finite element analysis by using progressive damage approach. The obtained results show a strong influence of initial imperfection in the composite laminate on the vessel strength. The performed calculations show that the failure of the weakest layers does not lead to loss of the load-carrying capacity of the composite shell and the structure burst occurs as results of the subsequent damage evolution process. Such phenomenon happens regardless of the level of initial imperfection.
Analysis and synthesis of parallel structure mechanism without singularities
Authors: Rashoyan G V , Aleshin A K , Antonov A V , Gavrilina L V , Glazunov V A , Skvortsov S A , Shalyukhin K A 
Published: September 2019

Abstract
Problems of analysis and synthesis of a parallel structure mechanism without singularities are considered in this paper. The spatial l-coordinate parallel structure mechanism, consisting of a base and an output link, connected with each other by six SPS kinematic chain, each of them containing one driven prismatic (P) kinematic pair and two nondriven spherical (S) pairs, is synthesized. The grapho-analytical method was used as a method of analysis and synthesis.
The method of the calculation of the average contact pressure in the interference joints of the details of different length
Authors: Ryazantseva I L , Dyundik O S , Zgonnik I P 
Published: September 2019

Abstract
The publication describes a universal calculation method of the average contact pressure in the interference joint with different lengths of fitting parts. The formulas given in the article were obtained under the condition of uniform radial displacement of the mating surface of that of the joined parts, the deformation of which causes the concentration of contact pressure at the mating boundaries after assembly.
The method provides sufficient accuracy for engineering calculations. It is distinguished by physic clarity, visibility and the simplicity of usage. It can be used for design and verification of calculations of smooth cylindrical joints with a long shaft and a long external member.
Analytical study of oscillating horizontal vibrations of a road roller
Authors: Tarasov V N , Boyarkina I V , Serebrennikov V S 
Published: September 2019

Abstract
Horizontal oscillating vibrations of a vibratory road roller are of secondary importance in comparison with vertical vibrations that compact soil and asphalt concrete. The consideration of horizontal vibrations is required for the improvement of the vibratory roller design aimed at reducing the overall accompanying vibration on the vibratory roller and on a human operator, as well as for the calculation of vibration exciter rolling bearings and rubber-metal shock absorbers. Two research tasks of vibratory drum horizontal vibrations on a solid non-deformable base have been solved in the article. The assumption has been made in the first task that there is sliding friction between the cylindrical roller and bearing surface; in the second research task of horizontal vibrations the cylindrical drum rolls over a solid bearing surface without slipping. The mode of horizontal oscillating vibrations differs in phase from the mode of vertical oscillating vibrations by the angle φ = 0.5π. When creating vibratory rollers, manufacturing companies strive for increasing the operation efficiency of vibratory rollers at the expense of increasing the centrifugal exciting force while maintaining or reducing the total weight of the vibratory roller. As a result of which the oscillation mode appeared where negative effects of additional loading of rubber-metal shock absorbers were found, connecting the vibratory drum with the roller front frame and increasing the overall vibration of the vibratory roller. Dependences of horizontal travels, speed and acceleration of a vibratory drum have been determined during the road roller forward movement. During one turn of the vibration exciter rotation the forward movement of the drum becomes a non-uniform one, i.e. it takes an oscillating vibrating nature. Rules and recommendations have been developed for the study of sliding conditions, vibratory drum balancing over the bearing surface etc.
Analytical studies of radial loads on rolling elements of ball and roller bearings
Authors: Tarasov V N , Boyarkina I V , Tarasov E V , Boyarkin G N 
Published: September 2019

Abstract
Rolling bearings have found wide application in mechanical engineering due to their design simplicity and high efficiency during the operation of machinery and equipment [1, 2]. At present the rolling element theory allows to fulfill complex static and dynamic calculations. The problems for the rolling bearing durability calculation, reduction of vibration and noise during the operation of machines and units are of particular relevance. The rolling bearing design simplicity is caused by a small number of component parts. However, dynamic and static processes appearing during the bearing operation possess a complex physical basis and are in need of further study and development. At present the dependence of the radial forces distribution on rolling elements along the bearing rotation angle exists only for the odd diagram of the working rolling element location using the Striebeck method. In the study a new additional design diagram is applied for the even symmetrical location of the bearing working rolling elements in the operating area, which allow to significantly improve the accuracy of performed calculations. The total number of rolling elements in a bearing can be an even or odd number, at the same time the number of working rolling elements taking up a workload in the Striebeck problem is always represented by an odd number. For this reason the known design diagram is of an insufficient accuracy, especially for a small number of rolling elements z. A new procedure of the problem solution relative to the determination of radial loads on rolling elements, where restrictions on the number of rolling elements are eliminated being accepted at present during the bearing calculation.
On developing method for determining materials properties and combustion system structural elements of launch vehicles separated parts
Authors: Trushlyakov V , Davydovich D , Zharikov K 
Published: September 2019

Abstract
The article considers a new class of problems, which studies the issues of burning the launch vehicle (LV) separating structures made from polymer composite material, including fillers and carbon fiber. As illustrated by the structure of the payload fairing (PF), which must undergo forced burning after the mission, four concepts for determining the materials properties are proposed. In conducting experiments in the wind tunnel with the implementation of the actual conditions of high-speed flow, the PF structural model is introduced in the consideration. The results of theoretical and experimental studies performed to determine the properties of the materials that make up the filler and carbon fiber are presented.
On the justification of the value of the apparent mass of soil in rheological modeling of the process of soil compaction by a vibrating roller
Authors: Tyuremnov I S , Morev A S , Furmanov D V 
Published: September 2019

Abstract
To solve the problem of justifying the characteristics of vibrating rollers, choosing a roller model for working under specific conditions, setting up the technological modes of compaction in a vibrating roller, it is required to model the dynamic interaction of a vibratory drum with the compacted soil. The mathematical model should allow us to study both the continuous and alternating contact operation modes of the vibratory drum and be consistent with the experimental results. The paper presents the results of the computational experiment based on a triple-mass rheological model of interaction between a vibrating roller and soil. It shows that the proposed model adequately reproduces vertical displacement and acceleration, as well as spectra of the vertical accelerations of a vibratory drum in a DM-614 roller during soil compaction. The conducted computational experiment of justifying the value of the apparent mass of soil showed that the best results can be achieved with value of the apparent mass of soil equal to 20% of the mass of the vibratory drum, which corresponds to the results of other researchers.
Application of the elastoplastic model of fatigue cracks growth for calculation of the residual resource of steps shafts
Authors: Vansovich K A , Aistov I P , Zenkov E V 
Published: September 2019

Abstract
By the example of a shaft loaded with bending and torsional moments, a method for estimating the residual life in the presence of a fatigue crack is presented. It is shown that a crack under conditions of complex loading in the process of growth is oriented normally to the greatest tensile stresses. The crack originates in the place of greatest stress concentration. Surface crack was modeled by the finite element method in the ANSYS Workbench program. It has been determined that after the initiation of a crack, a detail has a durability resource, which can be estimated by applying an elastoplastic model of fatigue crack growth.
Digital video watermarking algorithm robust against video container format changes
Authors: Belim S V , Cherepanov P G 
Published: September 2019

Abstract
A digital watermark embedding algorithm robust against any changes of a video container format with the use of a three-dimensional (3D) discrete cosine transform is proposed. For embedding the three-dimensional (3D) method based on Koch and Zhao’s two-dimensional (2D) method is applied. The image of a digital watermark and its digital hologram as embedded information are used. Embedding is carried out in a YUV color scheme. Computer-simulation experiments are made. The proposed method proved to be robust against attacks of video container format changes.
Fault-tolerance model of the information systems
Authors: Potapov V I , Goleva A I , Storozhenko N R , Shafeeva O P , Pastuhova E I , Chervenchuk I V 
Published: September 2019

Abstract
The article deals with the reliability problem of information systems and contains the developed method for assessing the fault-tolerance of data transmission systems and mathematical model that allows to obtain the probability of failure at different levels of information systems.
Reliability in the model of an information system with client-server architecture
Authors: Potapov V I , Shafeeva O P , Gritsay A S , Makarov V V , Kuznetsova O P , Kondratukova L K 
Published: September 2019

Abstract
Two mathematical models have been built to describe the behavior of an information system with a client-server architecture without and taking into account the ultimate reliability of the monitoring system and the restoration of the failed component of the system under consideration. The behavior of the information system in the presence of failures and the restoration of the performance of components is approximated by a Markov process and is described by a system of differential equations with variable coefficients. The solution of the obtained differential equations by numerical methods on computers allows the research of various characteristics of the reliability of information systems such as “client-server” in a wide range of changes in failure rates and restoration of system components.
The mathematical model of monitoring information system with failure prediction
Authors: Storozhenko N R , Goleva A I , Potapov V I , Pastuhova E I , Tunkov D A , Ralovec M L , Fakhrutdinov A R 
Published: September 2019

Abstract
The article is based on the monitoring faults problem of information systems and contains the mathematical model description of the process for monitoring faulty parameters for network equipment, which takes into account the probability dependence of events on a time intervals, and offers a method of probabilistic forecasting of the state of network failure.
The study of the duration of transient processes in growing random graphs with a non-linear preferential attachment rule
Authors: Zadorozhnyi V N , Badryzlov V A 
Published: September 2019

Abstract
A study of the duration of transients processes in random graphs with preferred attachment was carried out, during which it was found out that for some random graphs transient processes can last very long. For some known growing graphs the absence of stationary distribution of the vertices attachment degree has been found out for the first time. This makes the calculation methods and the techniques for analyzing transient processes up-to-date, because real networks modelled by this graphs, do not have stationary characteristics either. Real networks having stationary characteristics, can for a long time, even if they are too large, stay in the transient mode which does not let estimate these networks by stationary solutions. While modeling these networks, the methods for analyzing the transient modes are also urgent as they provide for controlling the errors of stationary solutions application. The paper gives the example of the stationary solution error control for a random graph, widely used in modeling of growing networks.