bluuebunny/crossref_metadata_2025 huggingface dataset:
The ground state, quadrupole-bound anion of succinonitrile revisited
Authors: Liu Gaoxiang , Ciborowski Sandra M. , Graham Jacob D. , Buytendyk Allyson M. , Bowen Kit H.
Published: September 2019

Using a combination of Rydberg electron transfer and negative ion photoelectron spectroscopy, we revisited an earlier study which, based on several separate pieces of evidence, had concluded that trans- and gauche-succinonitrile can form quadrupole bound anions (QBAs) and dipole bound anions (DBAs), respectively. In the present work, succinonitrile anions were formed by Rydberg electron transfer and interrogated by negative ion photoelectron spectroscopy. The resulting anion photoelectron spectra exhibited distinctive spectral features for both QBA and DBA species in the same spectrum, thereby providing direct spectroscopic confirmation of previous indirect conclusions. Just as importantly, this work also introduces the integrated combination of Rydberg electron transfer and anion photoelectron spectroscopy as a powerful, tandem technique for studying diffuse excess electron states.
Observation of a weak intra-residue C5 hydrogen-bond in a dipeptide containing Gly-Pro sequence
Authors: Kumar Satish , Mishra Kamal K. , Singh Santosh K. , Borish Kshetrimayum , Dey Sanjit , Sarkar Biplab , Das Aloke
Published: September 2019

Specific folded structures of peptides and proteins depend on the sequence of various amino acid residues as well as different types of noncovalent interactions induced by the backbone as well as side-chains of those residues. In general, secondary structures of peptides and proteins are stabilized by C6 (δ-turn), C7 (γ-turn), C10 (β-turn), C13 (α-turn), and C15 (π-turn) hydrogen-bonded rings formed through inter-residue interactions. However, it has been reported recently that an intraresidue C5 hydrogen-bond, which is relatively weak in strength, can contribute significantly to the stability of peptides and proteins. The C5 hydrogen-bond is mostly present in the β-sheet structures of peptides and proteins along with other inter-residue noncovalent interactions. In this work, we have studied structures and conformational preferences of a dipeptide Z-Gly-Pro-OH (Z = benzyloxycarbonyl) using mass-selected vibrationally resolved electronic spectroscopy and IR-UV double resonance spectroscopy coupled with quantum chemistry calculations. Two conformers of the peptide are observed in the experiment. One of the conformers has an extended β-strand type structure stabilized by C5 hydrogen-bonding, while the other one is folded through O—H ⋯ π interaction. The noncovalent interactions present in the two observed structures of the peptide are validated by natural bond orbital and noncovalent interaction calculations.
Low torsional barrier challenges in the microwave spectrum of 2,4-dimethylanisole
Authors: Ferres Lynn , Stahl Wolfgang , Nguyen Ha Vinh Lam
Published: September 2019

Low barriers to internal rotations are especially challenging for both the experimental and theoretical determinations because they result in large tunneling splittings which are hard to assign and in potential functions that can be difficult to model. In the present work, the internal rotations of two methyl groups of 2,4-dimethylanisole were analyzed and modeled using a newly developed computer code, called ntop, adapted for fitting the high-resolution torsion-rotation spectra of molecules with two or more methyl rotors. The spectrum was measured using a pulsed molecular jet Fourier transform microwave spectrometer operating in the frequency range of 2.0–26.5 GHz, revealing internal rotation tunneling quintets with splittings of up to several gigahertz. The V3 potential barriers are 441.139(23) cm−1 and 47.649(30) cm−1 for the o- and p-methyl groups, respectively. Quantum chemical calculations predicted only one conformer with the methoxy group in the anti position related to the neighboring o-methyl group. While the results from geometry optimizations were reliable, ab initio calculations at the MP2 level did not reproduce the low torsional barriers, calling for further experiments on related systems and additional theoretical models.
Phonon-induced plasmon-exciton coupling changes probed via oscillation-associated spectra
Authors: Kirschner Matthew S. , Jeong Yeonjun , Spencer Austin P. , Watkins Nicolas E. , Lin Xiao-Min , Schatz George C. , Chen Lin X. , Schaller Richard D.
Published: September 2019

Coherent vibrations detected in optical experiments can offer insights into material properties and electronic interactions, but also yield complex time-dependent optical signatures, especially in hybridized systems. Here, we adapt techniques from studies on vibrational wave packets in molecules to analyze the optical signatures of coherent acoustic phonons in nanoparticles. This strategy enables us to better understand the implications of energetic changes induced by coherent phonons. We then apply this approach to systems that target coherent acoustic phonons as a route to modulate plasmon-exciton coupling and compare the results to theoretical calculations. Taken together, the described approach provides an intuitive, simple means of analyzing future systems and facilitates attempts to utilize, rather than simply observe, nanomaterial phonon modes.
Vortex dynamics in low- and high-extent polymer drag reduction regimes revealed by vortex tracking and conformation analysis
Authors: Zhu Lu , Xi Li
Published: September 2019

Turbulent flow profiles are known to change between low- (LDR) and high-extent drag reduction (HDR) regimes. It is however not until recently that the LDR-HDR transition is recognized as a fundamental change between two DR mechanisms. Although the onset of DR, which initiates the LDR stage, is explainable by a general argument of polymers suppressing vortices, the occurrence of HDR where flow statistics are qualitatively different and DR effects are observed across a much broader range of wall regions remains unexplained. Recent development of the vortex axis tracking by iterative propagation algorithm allows the detection and extraction of vortex axis-lines with various orientations and curvatures. This new tool is used in this study to analyze the vortex conformation and dynamics across the LDR-HDR transition. Polymer effects are shown to concentrate on vortices that are partially or completely attached to the wall. At LDR, this effect is an across-the-board weakening of vortices which lowers their intensity without shifting their distribution patterns. At HDR, polymers start to suppress the lift-up of streamwise vortices in the buffer layer and prevent their downstream heads from rising into the log-law layer and forming hairpins and other curved vortices. This interrupts the turbulent momentum transfer between the buffer and log-law layers, which offers a clear pathway for explaining the distinct mean flow profiles at HDR. The study depicts the first clear physical picture regarding the changing vortex dynamics between LDR and HDR, which is based on direct evidence from objective statistical analysis of vortex conformation and distribution.
Multimode probing of superfluid 4He by tuning forks
Authors: Guthrie A. , Haley R. P. , Jennings A. , Kafanov S. , Kolosov O. , Mucientes M. , Noble M. T. , Pashkin Yu. A. , Pickett G. R. , Tsepelin V. , Zmeev D. E. , Efimov V.
Published: September 2019

Flexural mode vibrations of miniature piezoelectric tuning forks (TFs) are known to be highly sensitive to superfluid excitations and quantum turbulence in 3He and 4He quantum fluids, as well as to the elastic properties of solid 4He, complementing studies by large scale torsional resonators. Here, we explore the sensitivity of a TF, capable of simultaneously operating in both the flexural and torsional modes, to excitations in the normal and superfluid 4He. The torsional mode is predominantly sensitive to shear forces at the sensor–fluid interface and much less sensitive to changes in the density of the surrounding fluid when compared to the flexural mode. Although we did not reach the critical velocity for the quantum turbulence onset in the torsional mode, due to its order of magnitude higher frequency and increased acoustic damping, the torsional mode was directly sensitive to fluid excitations, linked to quantum turbulence created by the flexural mode. The combination of two dissimilar modes in a single TF sensor can provide a means to study the details of elementary excitations in quantum liquids and at interfaces between solids and quantum fluid.
Resonant acoustic wave assisted spin-transfer-torque switching of nanomagnets
Authors: Roe Austin , Bhattacharya Dhritiman , Atulasimha Jayasimha
Published: September 2019

We report the possibility of achieving an order of magnitude reduction in the energy dissipation needed to write bits in perpendicular magnetic tunnel junctions by simulating the magnetization dynamics under a combination of resonant surface acoustic waves (r-SAWs) and spin-transfer-torque (STT). The magnetization dynamics were simulated using the Landau-Lifshitz-Gilbert equation under macrospin assumption with the inclusion of thermal noise. The resonant magnetization dynamics in the magnetostrictive nanomagnet builds over few tens of cycles of SAW application that drives the magnetization to precess in a cone with a deflection of ∼45° from the perpendicular direction. This reduces the STT current density required to switch the magnetization direction without increasing the STT application time or degrading the switching probability in the presence of room temperature thermal noise. This could lead to a pathway to achieve energy efficient switching of spin-transfer-torque random access memory whose lateral dimensions can be scaled aggressively despite using materials with low magnetostriction by employing SAW excitation to drive ferromagnetic resonance.
Recent estimates of the out-of-pocket expenditure on health care in Australia
Authors: Yusuf Farhat , Leeder Stephen
Published: September 2019

Objective The aims of this study were to estimate the average annual out-of-pocket (OOP) expenditure on health care by households in Australia in 2015–16, and to compare this with the estimate for 2009–10. Methods Data from the most recent Household Expenditure Survey (HES) conducted by the Australian Bureau of Statistics were used. Various statistical methods were used to estimate the annual OOP expenditures at the household and national levels. Results The average annual OOP expenditure was A$4290 per household, representing 5.8% of the amount spent on all goods and services. Private health insurance (PHI) premiums, although not a direct expenditure on health care, were 40.6% of the total OOP expenses. Of the remaining 59.4%, nearly half was spent on doctors and other health professionals, and approximately one-third was spent on medicines. Dental treatments and specialist consultations were the most expensive, whereas visits to general practitioners incurred the least OOP expenditure. Households with PHI (58.6%) spent fourfold more on health care than those not insured. Compared with the 2009–10 survey, the biggest increases were in the cost of PHI (50.7%) and copayments to specialists (34.8%) and other health professionals (42.0%). Conclusions OOP expenditure on health care as a proportion of the total household expenditure on all goods and services has increased by more than 25% between 2009–10 and 2015–16. What is known about the topic? Australian households incur OOP expenses for health care in Australia for a wide range of goods and services, such as copayments to doctors and other health professionals beyond the Medicare rebates, the cost of medicines and other pharmaceutical goods not covered entirely by the Pharmaceutical Benefits Scheme and PHI premiums. Although other estimates of OOP expenditure are available in official reports of the Australian Institute of Health and Welfare, they are based on administrative records rather than consumer reports, and cannot be disaggregated by item or the characteristics of households. What does this paper add? This paper provides detailed information on OOP expenditure on health care as reported by a probability sample of households interviewed for the HES conducted by the ABS during 2015–16. These estimates of OOP expenditure, based on consumer reports, add a further dimension to the information available from administrative records only. What are the implications for practitioners? Practitioners should take account of the effect of increasing copayments for their services, especially on patients belonging to the lower socioeconomic categories. Increasing copayments may lead to people foregoing medical care. Health planners and politicians should note the steady upward drift in OOP expenses and factor these into their policies for future funding of health care.
Moral pride only under the positive gaze of others? Effects of praise and criticism on moral pride and guilt / ¿Orgullo moral solo bajo la mirada positiva de los otros? Los efectos del elogio y la crítica sobre el orgullo moral y la culpa
Authors: Conejero Susana , Apodaca Pedro , Pascual Aitziber , Etxebarria Itziar , Ortiz María-José
Published: September 2019

This study analysed the influence of praise and criticism on moral pride (the pride we feel when we believe we have done something morally good) and guilt. Ninety-two adolescents (age: M = 15.17, SD = 0.43; 44.6% girls, 55.4% boys) completed a questionnaire which outlined 10 scenarios based on combinations of three variables: the moral nature of the action (positive/negative); praise, criticism or the absence of either; and the source (parents/peers). Participants were asked to indicate the intensity with which they would feel pride and guilt (seven-point scale). Praise of positive actions increased pride. Interestingly, criticism of positive actions reduced pride and increased guilt, while praise of negative actions reduced guilt and increased pride. No differences were found between the pride felt after a criticized positive action and that felt after a praised negative action. A parallel effect was not, however, observed for guilt. These results reveal the strong, sometimes pernicious, influence of praise and criticism on guilt and pride and, even more, the need for praise by others in the experience of moral pride.
VPS37A directs ESCRT recruitment for phagophore closure
Authors: Takahashi Yoshinori , Liang Xinwen , Hattori Tatsuya , Tang Zhenyuan , He Haiyan , Chen Han , Liu Xiaoming , Abraham Thomas , Imamura-Kawasawa Yuka , Buchkovich Nicholas J. , Young Megan M. , Wang Hong-Gang
Published: September 2019

The process of phagophore closure requires the endosomal sorting complex required for transport III (ESCRT-III) subunit CHMP2A and the AAA ATPase VPS4, but their regulatory mechanisms remain unknown. Here, we establish a FACS-based HaloTag-LC3 autophagosome completion assay to screen a genome-wide CRISPR library and identify the ESCRT-I subunit VPS37A as a critical component for phagophore closure. VPS37A localizes on the phagophore through the N-terminal putative ubiquitin E2 variant domain, which is found to be required for autophagosome completion but dispensable for ESCRT-I complex formation and the degradation of epidermal growth factor receptor in the multivesicular body pathway. Notably, loss of VPS37A abrogates the phagophore recruitment of the ESCRT-I subunit VPS28 and CHMP2A, whereas inhibition of membrane closure by CHMP2A depletion or VPS4 inhibition accumulates VPS37A on the phagophore. These observations suggest that VPS37A coordinates the recruitment of a unique set of ESCRT machinery components for phagophore closure in mammalian cells.
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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Universal classes in the category of simple graphs
Authors: Remeslennikov Vladimir , Treier Alexander
Published: September 2019

In this article, we show that the concept of graph compression is important for the study of universal equivalence of simple graphs (not necessarily finite) and graph algebraic structures.
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

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

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.
Automation of agrotechnical assessment of cotton harvesting machines
Authors: Abdazimov A D , Radjabov S S , Omonov N N
Published: September 2019

The method of rapid evaluation of agrotechnical indices of cotton harvesting machines, based on computer processing of digital images of cotton row before and after machine harvesting, is proposed in the paper. The algorithms and software to solve the problem of assessing the quality of cotton harvester performance and to determine the indices of the agricultural background of the cotton field, based on the analysis of the plot images taken from different angles, are presented. The application of the proposed technique allows significant reduction of time and money to test the machines, rapid evaluation of their performance directly during the tests. The software and hardware developed can be used in test automation, in automatic systems for monitoring and controlling the technological processes and modes of operation of agricultural machinery, in particular, cotton harvesting machines.
Constructing the measuring system in industry 4.0 concept
Authors: Yu Andieva E , Ivanov R N
Published: September 2019

The context of global changes in world trends makes the development for the target architecture of the digital platform and the detail of these solutions relevant, this is due to the growing problems for digitizing complex heterogeneous industrial systems. The objective is to create the measurement system in Industry 4.0 concept. The concept should contain the requirements for the measurement system, the procedure for constructing the measuring system, the state of tracking of an underlying asset attributes (oil product) at all stages of its life cycle. The authors proposed the measurement system in Industry 4.0 concept, which is aimed at the optimal construction of the measuring system of the state attributes of the main asset (petroleum product) and the optimal equipment condition. The concept that has been developed can be used in petrochemical processing and oil and gas industry.
Cutting tool wear monitoring using the diagnostic capabilities of modern CNC machines
Authors: Antsev A V , Zhmurin V V , Yanov E S , Dang T H
Published: September 2019

The article discusses the automation of the tool wear monitoring for collecting statistics on the cutting process and taking into account its variability in the design of technological processes for the manufacture of engineering products. It is proposed to use the diagnostic capabilities of modern CNC machines. The main methods of tool wear monitoring are considered: a direct method using optical or electromechanical methods or an indirect method using measurement of the load of drive motors or oscillations of a technological system. The automation of the direct tool wear monitoring method on the Heidenhain TNC 620 CNC system is presented. The change in load on a main motion drive during a tool wear is shown on a practical example. The experimental setup for estimating cutting tool wear by vibration level is proposed.
Economic evaluation of use of heat exchange equipment diagnostic software at diesel hydrotreating unit
Authors: Demin A M , Naumenko A P , Reutova O A , Odinets A I
Published: September 2019

This study focuses on problems related to fouling of heat exchange equipment of diesel hydrotreatment (DHT) processes and diagnostics of heat exchanger condition. Fouling is a critical aspect directly affecting the performance of a heat exchanger. The objective of this study is to determine, using a mathematical model, an optimal timing for cleaning of DHT heat exchange equipment for the removal of fouling. In accordance with results of calculations performed with a mathematical model of a typical DHT unit (L-24/9), condition assessment index for a heat exchanger of the reactor section increases from 1 to 1.37 when shell side fouling factor increases from 0.00003 to 0.00150 (°C·h·m2)/kJ. This results in a decrease of the feed temperature at the vessel outlet, and an increase of costs related to additional fuel consumed by heaters by over RUB 1 million/month. Therefore, activities related to the cleaning of tube bundles of reactor section heat exchangers pay back in full in 1 month, as fuel savings brought about by the cleaning exceeded 12.6%. In order to carry out diagnostics of heat exchange surface fouling and to determine an optimal timing for tube bundle cleaning in order to remove deposits, vessels have to be equipped with transmitters measuring temperatures of all inlet/outlet streams. The use of on-line heat exchanger diagnostics makes it possible to choose an optimal timing of tube bundle cleaning based on comparability of costs related to additional fuel consumption and cleaning costs.
Development and simulation of the pulsed fuzzy controller with low control costs
Authors: Denisova L A , Meshcheryakov V A , Karabtsov R D
Published: September 2019

The article deals with the development and simulation of the control system of water level in the tank as a typical automation object. The level automatic control system (ACS) based on traditional pulse controllers is presented. The system is proposed as well that performs fuzzy logical inference to generate pulsed control action and at the same time implements low-cost control. Comparative analysis of these control systems simulated with MATLAB / Simulink / Fuzzy Logic Toolbox was made. It is shown that the developed fuzzy ACS is more effective than a traditional ACS.
Accuracy of discrete metering devices in relation with the criterion of formed mixture quality assessment
Authors: Evseev A V
Published: September 2019

The article considers the quality indicator (criterion) of the resulting mixture products as a two-parameter function of the metering devices accuracy and the parameter of the final effective mixture (product) application. The first parameter is intermediate and considers the functional characteristics of the single-piece produced an effective dose of a mixture with a given (required) volume or mass. The second parameter reflects the results of the final task to use mixture products or a product in total. Such a technological approach is advisable when it is difficult to describe the process of forming the mixture quality by one parameter, or when taking into account a large number of factors affecting the mixture quality obtained, and the result becomes biased. Then the second parameter is worked into the structure of the criterion for quality mixing assessment, taking into account the ultimate goal of using a mixed product or the product this mixture is included into. In this case a significant number of factors affecting the mixture quality and the effectiveness of its use according to two generalized parameters can be considered. The first typical classical parameter that affects the quality directly during mixing is the accuracy of the constituent component dosing. The second output parameter of the finished product comprehensively describes the efficiency of its use. The final parameters of the mixtures application can be determined experimentally, analyzed, and they, in turn, integrally cover the entire spectrum of many diverse factors affecting the mixture quality and the effectiveness of its use.
Developing an informational model of instrumental examination
Authors: Filatova A , Povoroznyuk A , Gavrylenko S , Fahs M
Published: September 2019

This document presents the development of an informational model of instrumental examination of a patient using the data flow diagrams (DFD). The developed informational model of the instrumental examination is presented in the form of a context diagram, its decomposition, and the decomposition of the subsystems «Registration and analysis of biomedical signals and images with locally concentrated features» and «Diagnostics». Taking into account the proposed information model, UML diagrams of the activity of the biomedical decision support system based on morphological analysis of biomedical signals and images with locally concentrated features, of the module for morphological analysis of an electrocardiogram, and of the module for improving the quality of visualization of biological objects on radiological images based on the IMRI method are developed.