bluuebunny/crossref_metadata_2025 huggingface dataset:
Seismic Imaging of the Alaska Subduction Zone: Implications for Slab Geometry and Volcanism
Authors: Martin‐Short Robert , Allen Richard , Bastow Ian D. , Porritt Robert W. , Miller Meghan S.
Published: October 2018

Alaska has been a site of subduction and terrane accretion since the mid‐Jurassic. The area features abundant seismicity, active volcanism, rapid uplift, and broad intraplate deformation, all associated with subduction of the Pacific plate beneath North America. The juxtaposition of a slab edge with subducted, overthickened crust of the Yakutat terrane beneath central Alaska is associated with many enigmatic volcanic features. The causes of the Denali Volcanic Gap, a 400‐km‐long zone of volcanic quiescence west of the slab edge, are debated. Furthermore, the Wrangell Volcanic Field, southeast of the volcanic gap, also has an unexplained relationship with subduction. To address these issues, we present a joint ambient noise, earthquake‐based surface wave, and P‐S receiver function tomography model of Alaska, along with a teleseismic S wave velocity model. We compare the crust and mantle structure between the volcanic and nonvolcanic regions, across the eastern edge of the slab and between models. Low crustal velocities correspond to sedimentary basins, and several terrane boundaries are marked by changes in Moho depth. The continental lithosphere directly beneath the Denali Volcanic Gap is thicker than in the adjacent volcanic region. We suggest that shallow subduction here has cooled the mantle wedge, allowing the formation of thick lithosphere by the prevention of hot asthenosphere from reaching depths where it can interact with fluids released from the slab and promote volcanism. There is no evidence for subducted material east of the edge of the Yakutat terrane, implying the Wrangell Volcanic Field formed directly above a slab edge.
Scale Dependence of Cloud Microphysical Response to Turbulent Entrainment and Mixing
Authors: Kumar Bipin , Götzfried Paul , Suresh Neethi , Schumacher Jörg , Shaw Raymond A.
Published: October 2018

The dynamics and lifetime of atmospheric clouds are tightly coupled to entrainment and turbulent mixing. This paper presents direct numerical simulations of turbulent mixing followed by droplet evaporation at the cloud‐clear air interface in a meter‐sized volume, with an ensemble of up to almost half a billion individual cloud water droplets. The dependence of the mixing process on domain size reveals that inhomogeneous mixing becomes increasingly important as the domain size is increased. The shape of the droplet size distribution varies strongly with spatial scale, with the appearance of a pronounced negative exponential tail. The increase of relative dispersion during the transient mixing process is strongly dependent on the scale of the mixing and therefore on the Damköhler number, defined as the turbulence large‐eddy time scale divided by the cloud supersaturation relaxation time.
Fresnel Reflection and Transmission Coefficients for Temporally Dispersive Attenuative Media
Authors: Oughstun Kurt E. , Palombini Christopher L.
Published: October 2018

Generalized Fresnel reflection and transmission coefficients are derived for both time‐harmonic TE(s)‐ and TM(p)‐polarized plane wave fields incident upon a planar interface separating two attenuative linear media, each described by a frequency‐dependent complex‐valued dielectric permittivity
, magnetic permeability
, and electric conductivity
while maintaining the real‐valued form of Snell's law. The resultant effects of material loss on both the reflected and transmitted fields are presented, including the condition for the appearance of a polarizing angle.
A Nomograph to Incorporate Geophysical Heterogeneity in Soil Moisture Downscaling
Authors: Gaur Nandita , Mohanty Binayak P.
Published: October 2018

Hydrological applications require robust and periodic spatially distributed soil moisture data. Radiometer‐based soil moisture (~30–60‐km resolution), after being appropriately downscaled (<5‐km resolution), can be a valuable resource for providing such data globally. However, the accuracy of available downscaling algorithms is severely affected by subgrid variability in geophysical factors and precipitation within a satellite footprint. In this work, we introduce a scaling nomograph that incorporates the scale and site specific dependence of soil moisture on geophysical heterogeneity and antecedent wetness conditions to overcome this limitation. We developed functional scaling relationships to estimate the semivariogram of downscaled soil moisture change without any available fine‐scale soil moisture data. The nomograph enables these relationships to be specific to the geophysical heterogeneity and antecedent wetness within a radiometer‐based satellite footprint through footprint specific heterogeneity and wetness indices. The heterogeneity index quantifies the subgrid scale variability and covariability of soil, vegetation, and topography within the footprint, and the wetness index is a measure of antecedent precipitation. The nomograph was developed for Arizona, Iowa, and Oklahoma and can enable downscaling to scales varying between 0.8 and 6.4 km. The true power of the nomograph is to enable the use of static dominant factors like soil to define dynamic scale specific scaling relationships for soil moisture for different kinds of land use and land cover in a data driven yet scientific approach, thus providing spatial transferability to the downscaling scheme. The spatial transferability of the nomograph was validated by downscaling Soil Moisture Ocean Salinity data in Manitoba, Canada.
Endoplasmic reticulum resident oxidase ERO1-Lalpha promotes hepatocellular carcinoma metastasis and angiogenesis through the S1PR1/STAT3/VEGF-A pathway
Authors: Yang Shikun , Yang Chao , Yu Fei , Ding Wenbing , Hu Yuanchang , Cheng Feng , Zhang Feng , Guan Bugao , Wang Xuehao , Lu Ling , Rao Jianhua
Published: October 2018

Mounting evidence demonstrates that expression of ERO1α, an endoplasmic reticulum (ER)-resident oxidase, is a poor prognosis factor in a variety of human cancers. However, the clinical relevance of ERO1α and its molecular mechanisms underlying tumor progression have not been determined for hepatocellular carcinoma (HCC). ERO1α expression levels in HCC tissues and cells were detected by quantitative real-time PCR and western blotting. ERO1α shRNAs and overexpression vector were transfected into HCC cells to downregulate or upregulate ERO1α expression. In vitro and in vivo assays were performed to investigate the function of ERO1α in invasion, metastasis, and angiogenesis of HCC. We found high ERO1α expression in HCC tissues and cells that was significantly associated with metastasis and poor clinicopathologic features of vascular invasion, advanced Edmondson Grade, and TNM stage. Loss-of-function and gain-of-function studies showed that ERO1α prompted migration, invasion, epithelial–mesenchymal transition (EMT), and angiogenesis of HCC cells both in vitro and in vivo. Further studies verified a positive correlation between ERO1α and S1PR1, upregulated in metastatic HCC tissues compared with HCC tissues without metastasis. S1PR1 knockdown markedly diminished the effects of ERO1α on HCC cell migration, invasion and vascular endothelial growth factor (VEGF) expression. Most importantly, ERO1α knockdown significantly repressed the death of HCC xenograft mouse models by reducing tumor distant metastasis, and host angiogenesis by suppressing the expression of S1PR1, p-STAT3, and VEGF-A in HCC cells. Our findings suggest that ERO1α is significantly correlated with reduced survival and poor prognosis, and promotes HCC metastasis and angiogenesis by triggering the S1PR1/STAT3/VEGF-A signaling pathway. ERO1α might be a novel candidate in HCC prognosis and therapy.
RETRACTED ARTICLE: A new synthetic derivative of cryptotanshinone KYZ3 as STAT3 inhibitor for triple-negative breast cancer therapy
Authors: Zhang Wenda , Yu Wenying , Cai Guiping , Zhu Jiawen , Zhang Chao , Li Shanshan , Guo Jianpeng , Yin Guoping , Chen Chen , Kong Lingyi
Published: October 2018

Silencing STAT3 is confirmed as a promising therapeutic strategy for triple-negative breast cancer (TNBC) therapy to address the issue of its poor prognosis. In this study, the natural product cryptotanshinone was firstly remodeled and modified as a more effective STAT3 inhibitor by structure-based strategy. The synthetic derivative KYZ3 had 22–24-fold increase in antitumor activity than cryptotanshinone on two TNBC cell lines but had little effect on normal breast epithelial MCF-10A cells. Further investigation showed that KYZ3 inhibited persistent STAT3 phosphorylation. It also prevented the STAT3 protein nuclear translocation to regulate the expressions of the target oncogenes including Bax and Bcl-2. Furthermore, KYZ3 inhibited TNBC cell metastasis by decreasing the levels of MMP-9 which were directly regulated by activated STAT3. A STAT3 plasmid transfecting assay suggested that KYZ3 induced tumor cell apoptosis mainly by targeting STAT3. Finally, KYZ3 suppressed the growth of tumors resulting from subcutaneous implantation of MDA-MB-231 cells in vivo. Taken together, KYZ3 may be a promising cancer therapeutic agent for TNBC.
Quest for New Thermoelectric Materials
Authors: Stevanović Vladan , Gorai Prashun , Ortiz Brenden , Toberer Eric S.
Published: October 2018

In the context of materials design and high-throughput computational searches for new thermoelectric materials, the need to compute electron and phonon transport properties renders direct assessment of the thermoelectric figure of merit (zT) for large numbers of compounds challenging. On the other hand, recent discoveries demonstrate how entirely new material systems can lead to the disruption of existing technologies and a three-fold increase in the efficiency of thermoelectric generators. This chapter reviews recent efforts in developing robust computational approaches to screen the chemical space of inorganic materials for thermoelectric performance. The starting point is Boltzmann transport theory and the description of various strategies used in high-throughput computations to overcome the limitations associated with direct calculations of electron and phonon relaxation times. Next, we describe the implementation of these strategies and the resulting identification of new promising thermoelectric materials. Particular emphasis is on experimental validation of computational predictions. Finally, we discuss the current outstanding challenges including dopability of semiconductors, finite temperature phenomena, and systems beyond Boltzmann transport theory. Addressing these will further improve the reliability of predictions and bring us closer to the true thermoelectric materials by design.
Rational Design of Polymer Dielectrics: An Application of Density Functional Theory and Machine Learning
Authors: Mannodi-Kanakkithodi A. , Ramprasad R.
Published: October 2018

Progress in materials science can benefit significantly from the use of modern computational and data-driven methods. Thus, in the present-day research environment, traditional trial-and-error type approaches to materials design are increasingly being replaced by computation-guided experimental design. The advent of materials informatics further adds a unique dimension with the application of state-of-the-art machine learning techniques on the generated data to yield accurate learning models. In this chapter, we describe a rational design approach centred around high-throughput computations, machine learning and targeted experimentation aimed at discovering new and advanced polymer dielectrics for energy storage capacitor applications. Density functional theory computations were performed on a few hundred polymers from a selected chemical space to estimate their dielectric constants and band gaps, two properties that provide useful initial screening criteria for capacitor dielectrics. Synthesis and characterization was done for a few screened candidates to validate the computations and provide initial promising candidates. Further, machine learning techniques were applied on the computational data to yield crucial correlations between polymer attributes and properties as well as regression-based property prediction models, which enabled swift expansion of knowledge to unexplored regions of the chemical space. Synthesis of many of the promising polymers thus identified, formation of thin films, impressive dielectric breakdown and loss characteristics, along with computationally validated and desirable dielectric constants and band gaps makes this a story of successful co-design of novel polymer dielectrics.
Recent Advances in the Theory of Non-carbon Nanotubes
Authors: Enyashin Andrey N.
Published: October 2018

Our classical understanding of hollow inorganic nanostructures, established by Linus Pauling in 1930 and recommenced by Reshef Tenne 25 years ago, has undergone a revolution in recent years, owing to the rapid growth of computational facilities and to the new experimental and theoretical techniques looking into the origin of properties at an atomistic level. This overview gathers both the basic concepts and the most recent results from the diverse and broad field of computational materials science devoted to non-carbon nanotubes. A special emphasis is given to the stability, electronic, mechanical and capillary properties obtained at an interface between fundamental theoretical research and engineering of new advanced materials like commercially available nanotubes of layered sulfides, aluminosilicates and boron nitride.
One-pot synthesis of electron-acceptor composite enables efficient fullerene-free ternary organic solar cells
Authors: Zhang Jianyun , Liu Wenrui , Chen Shanshan , Xu Shengjie , Yang Changduk , Zhu Xiaozhang
Published: October 2018

An effective strategy of “synthesizing an electron-acceptor composite (ZITI-m) by one-pot reaction” to improve photovoltaic performance is proposed.
Colorimetric detection and ratiometric quantification of mercury(ii) using azophenol dye: ‘dip & read’ based handheld prototype device development
Authors: Singh Gagandeep , Raj Pushap , Singh Harupjit , Singh Narinder
Published: October 2018

The extreme toxicity of mercury and its derivatives results from its high affinity for thiol groups in proteins and enzymes, leading to the dysfunction of cells and consequent health problems.
Simple and low‐loss flip‐chip bonding based on ink‐jet printing for RF applications
Authors: Kang H.L. , Lee Y.S. , Sim S.M. , Yu J.H. , Shin K.Y. , Lee S.H. , Kim J.M.
Published: October 2018

In this Letter, a flip‐chip bonding based on ink‐jet printing technology is proposed and verified by interconnecting a separated coplanar waveguide (CPW) samples. Before the flip‐chip bonding process, diameter and height of ink‐jet printed silver bumps for flip‐chip bonding are measured to be about 300 and 13 µm, respectively. In a frequency range from 300 kHz to 3 GHz, return loss and insertion loss of the flip‐chip bonded CPW samples are measured to be higher than 20 dB and lower than 1.8 dB, respectively, where the length of the signal line is 35 mm. There are negligible discrepancies between radio frequency (RF) characteristics of the flip‐chip bonded CPW and those of a conventional CPW. These results show that the proposed flip‐chip bonding can be used to integrate RF components into electronic devices with low‐loss using simple procedures.
Green 5G enabling technologies: an overview
Authors: Zhang Shunliang , Cai Xuejun , Zhou Weihua , Wang Yongming
Published: October 2018

Given the rising concerns on carbon emission and increasing operating expense pressure, mobile network operators and device vendors are actively driving the energy‐efficient network evolution. Energy efficiency (EE) has been determined as one of the key objectives of the 5G system. To realise sustainable 5G, various new technologies have been proposed to reduce conventional energy consumption. Meanwhile, green energy sources are explored to reduce the dependence on conventional energy. This study makes a survey on recent academia and industry research on the EE of the 5G system from perspectives of radio resource management, architecture and deployment paradigm, green energy harvesting and smart grid integration. Typical green 5G enabling technologies are presented and discussed comprehensively. Moreover, the latest progress on EE in 3GPP is also investigated. Given the broad research areas, only those critical open issues and challenges are presented to inspire further investigations. Finally, the authors identify several research directions as the way forward to realise the green 5G system.
Vibration‐energy‐optimal trajectory planning for flexible servomotor systems with state constraints
Authors: Mu Haihua , Chen Han , Zhu Yu
Published: October 2018

This study proposes a trajectory planning approach to achieve minimum energy consumption and zero residual vibration for flexible servomotor systems with state constraints. Differing from existing approaches, the proposed approach firstly constrains residual vibration to zero, and total energy consumption as an objective is minimised under the condition of residual vibration suppression and meanwhile, the state constraints of velocity, acceleration, and jerk are satisfied. By the convexification of the minimum energy consumption objective function and the discretisation of relevant terms, the trajectory generation is successfully formulated into a quadratic programming problem, which is solved by convex optimisation technique. Comparative simulations and experiments are carried out, and the results indicate the effectiveness of the proposed method.
Modelling of ultra‐wide stop‐band frequency‐selective surface to enhance the gain of a UWB antenna
Authors: Das Priyanka , Mandal Kaushik
Published: October 2018

Here, an ultra‐wide stop‐band single‐layer frequency‐selective surface (FSS) with high‐incidence angle independence has been proposed to enhance the gain of an ultra‐wideband (UWB) monopole antenna. The unit cell (0.2λ × 0.2λ) of the proposed FSS consists of four asymmetric rectangular patches with circular slots embedded in it. This concept of four slotted patches is conceived to achieve ultra‐wide stop‐band characteristic over 4.7–14.9 GHz. An equivalent lumped circuit model for the FSS is proposed to provide insight into the working nature of the FSS. A UWB monopole antenna is also designed and integrated with the proposed FSS. Ultra‐wide stop‐band single‐layer FSS converts the omnidirectional pattern of the monopole antenna into a unidirectional one and thereby registers a significant increase in its gain by 4.5 dBi. The design concept has been discussed and experimentally verified using simulated and measured results.
Hot-star wind models with magnetically split line blanketing
Authors: Krtička J.
Published: October 2018

Fraction of hot stars posses strong magnetic fields that channel their radiatively driven outflows. We study the influence of line splitting in the magnetic field (Zeeman effect) on the wind properties. We use our own global wind code with radiative transfer in the comoving frame to understand the influence of the Zeeman splitting on the line force. We show that the Zeeman splitting has a negligible influence on the line force for magnetic fields that are weaker than about 100 kG. This means that the wind mass-loss rates and terminal velocities are not affected by the magnetic line splitting for magnetic fields as are typically found on the surface of nondegenerate stars. Neither have we found any strong flux variability that would be due to the magnetically split line blanketing.
Research of working capacity of grinding wheels
Authors: Ivanova Tatyana N.
Published: October 2018

The processing of materials by cutting with abrasive tool is carried out by means of thousands of grains bonded together as a single whole. The quality of abrasive tool is defined by cutting properties of abrasive grains and depends on features of spreading of temperature field in time and in abrasive grain volume. Grains are exposed to heating and cooling during work. It leads to undesired effects such as decrease of durability of grain retention in the binder, hardness, intensification of diffusion and oxidation processes between the binder and grain, the occurrence of considerable temperature stresses in the grain itself. Obtained equation which allows calculation of temperature field of grain for one rotation of grinding wheel shows that the temperature of the wheel depends on grinding modes and thermophysical properties of abrasive material. Recommendations for working capacity of grinding wheels in each operation mode and with a transition from one mode to another are given. As a result of research different dependencies were determined. They include dependencies governing the extent of influence of granularity, difference in height and concentration of grains, geometry parameters of detail to be machined and grinding wheel on machining modes and the thickness of layer cutoff by one grain.
Perspectives of the industrial recycling of hard-alloy materials waste by electro-erosive grinding
Authors: Rakhimyanov Kharis , Marusina Valentina
Published: October 2018

The creation of efficient industries is possible by using sustainable technologies based on the processes of recycling of the production waste. First of all, it refers to expensive material waste, including hard alloys. The electro-erosive grinding is considered to be the effective method of recycling such materials. The results of research on recycling the tungsten-cobalt hard alloy show the possibility of obtaining tungsten-carbide powders possessing improved physical and mechanical properties. The technology mentioned is also perspective for recycling tungstenless hard-alloy waste both at the laboratory devices equipped with the RC-generator and at the industrial installations of bulky grinding. It is established experimentally that the electro-erosive grinding of the TN20 tungstenless hard alloy at the laboratory provides obtaining the main volume (up to 85%) of the powder particles of the spherical shape having a dimension of 5 µm and the specific surface of 31.5 m2/g. Higher physical and mechanical properties of powders are also provided during recycling the TN20 alloy waste at the industrial installations of bulky grinding.
Development and improvement of lost foam casting technology based on mathematical modeling
Authors: Nesterov Nikolay , Vorontsov Boris
Published: October 2018

A detailed analysis of the process of filling the mould for lost foam casting technology was made based on a mathematical model, that takes into account the emergence of low-frequency oscillations. The optimum range of technological parameters for a few specific details were discovered. The factors that may lead to the release of metal and to mould collapse were also identified.
Bases of variational method for calculating of metal-cutting systems accuracy
Authors: Anikeeva Olesya , Ivakhnenko Alexander , Erenkov Oleg
Published: October 2018

The bases of a variation method to calculate the metal-cutting systems accuracy for the first time are systemically stated in this paper. The main attention is paid to a problem of joint influence of geometrical accuracy of machine tools and cutting tools parameters on the details processed surfaces accuracy. The general mathematical model of metal-cutting systems accuracy is presented in this work. The general model is the basis to develop the full mathematical model of turning metal-cutting system accuracy. The results of accuracy modeling at turning with a wide cutter are received when studying nature of influence of the lathe and the cutting tool geometrical errors on processing accuracy of cylindrical and face surfaces. The directions of further researches in the field of calculations of metal-cutting systems accuracy at difficult surfaces processing by the shaped cutting tool and also when accounting rigidity of the systems elements and the proceeding processes are revealed in the presented work.
Experimental research of cutting forces during microgrinding
Authors: Dyakonov Aleksandr , Gorodkova Anastasia
Published: October 2018

In high-speed and heat-stressed processes, the cutting force is a determining parameter of surface quality. The existing studies of the cutting force in microgrinding are experimental and their results are valid for a narrow range of the processed material. The paper describes the experimental study of strength when microgrinding complex alloy steel. The obtained results allow to expand the field of use of micro-grinding technology applied to metal materials.
Self-oscillation suppression when turning non-rigid shafts using spring tools and the spring headstock center
Authors: Svinin Valery , Samsonov Aleksey , Savilov Andrey , Pyatykh Aleksey
Published: October 2018

One of the new but understudied self-oscillation elimination methods applied in metal cutting involves creation of an extra tangential oscillating circuit adjusted to resonance with the main normal circuit in the cutting zone. To assess the efficiency of the method, spring tool and driving dogs were developed. They were used in axial turning of non-rigid shafts. In comparison with standard tools fastened in the center, spring tools decrease the amplitude of self-oscillations by a mean of 90 %.
Rational modes selection of magnetic treatment of metal surfaces
Authors: Burlachenko Oleg , Lyashenko Alexander , Ivanov Maxim
Published: October 2018

The given article considers the problem of machine parts working capacity increase based on the complex surface treatment. The authors proposed perspective method of surface treatment that it should be in the elastically plastic deformation of friction surfaces in an alternating magnetic field. In addition, a mathematical apparatus, which makes it possible to reveal the most rational treatment regime, was proposed.
Study of surface quality using quasi-optimal correlation algorithms
Authors: Nosov Nicolay V.
Published: October 2018

The article proposes a new approach for evaluating roughness of the profile surface of gas turbine engine blade airfoils after vibratory polishing. An optical electronic unit was used to study microgeometry of blade suction and pressure sides: video imagery of the surface was processed using computer methods to obtain the average amplitude of the autocorrelation function variable component. The applied optical electronic method of evaluating microgeometry of compressor/turbine blades allows obtaining fields of surface roughness and tension concentration coefficients as well as analyzing the finish machining technology to a greater depth.
The influence of the tool base on the formation of stresses in wear-resistant coatings in the cutting process
Authors: Chikhranov Aleksey , Tabakov Vladimir , Nazarova Olga
Published: October 2018

The results of studies of the influence of the material of the tool base on the formation of stresses in wear-resistant coatings of various compositions are presented. It is shown that the stresses in the coating during the cutting process depend on the properties of the material of the tool base and the composition of the coatings. The stresses change in the coatings during the cutting process is analyzed. It is shown that the use of coatings with high compressive stresses makes it possible to increase the period of resistance of plates made of hard alloy and high-speed steel.
Backing plate effect on temperature controlled FSW process
Authors: Zybin Igor , Trukhanov Konstantin , Tsarkov Andrey , Kheylo Sergey
Published: October 2018

Friction stir welding (FSW) has become an important application in modern industries. Friction stir welding is a widely used solid state joining process for soft materials such as aluminum alloys as it avoids/minimizes common problems of fusion welding processes, i.e. distortion, porosity, solidification and liquation cracking etc. Improper selection of parameters such as welding speed, rotational speed, forge force, back plate material etc. affects the weld quality. Thermal boundary condition at the bottom of the work pieces to be joined is important in determining the result of weld quality and its properties, for a given alloy type, tool geometry and selected process parameters (welding speed, rotational speed etc), These thermal boundary conditions are governed by the back plate material used. By using backing plates made out of materials with widely varying thermal diffusivity this work seeks to elucidate the effects of the root side thermal boundary condition on weld process variables and resulting joint properties. Welds were made in 5-mm-thick AMг5 (AA 5056) using siliceous coating, stainless steel, mild steel, and aluminum as backing plate (BP) material. Effects of backing plate material on the tensile strength and elongation were obtained for a particular case.
Functional parameters of the cutting process of the cutting tool with multilayer coatings after pulsed laser treatment
Authors: Sizov Sergei , Tabakov Vladimir , Chikhranov Aleksey
Published: October 2018

The paper presents the results of functional parameters of the cutting process using the multilayer coated cutting tool based on nitrides of titanium, zirconium, niobium and aluminum – TiN-TiZrN-TiZrAlN, TiN-TiZrN-TiZrNbAlN before and after the impulse laser processing. It was demonstrated that the impulse laser processing shortens the overall contact length between chips and the front surface, decreases the chips shorting coefficient, cutting force components and the heat flow capacity at the front surface. The shortening of the overall contact length gives some boost to the rate of heat flows along the front and rear surfaces. This fact decreases contact temperatures in comparison with the instrument without the pulsed laser treatment. It was demonstrated that the shortening of the overall contact length between chips and the front surface after the pulsed laser treatment adjusts temperature filed isotherms and stress isobars in the tool cutting wedge to the rear surface and the cutting edge.
Designing spline broaches of optimal structure
Authors: Lukina Svetlana , Krutyakova Margarita , Ivannikov Sergey
Published: October 2018

Methods of designing spline broaches of optimal structure according to smallest length of body are described. Multitude of broach designs may be explained by summation of geometric, structural and operating parameters of working and tail parts. In order to evaluate the efficiency of spline broaches, a system of functions characterizing length of broach, round and chamfer parts in accordance with the cutting pattern is introduced. A system of structural and technological limitations over basic features of broaches is supported. Mathematical optimization model of a broach consisting of a sum of target functions and constraint system is put together. Choice of optimal solution is based on implementation of linear programming algorithms. Optimal methods of designing spline broaches are determined using MS Excel. The developed design method is applicable for comparative evaluation of spline broaches of various designs with various cutting and cut-off patterns and allows to form the entire sum of broach designs according to set input parameters and to choose the most efficient one which would correspond to minimal length of the tool.
Methods of automated control over composition and structure of metalworking equipment
Authors: Lukina Svetlana , Korshunova Elena , Dorozhkin Igor
Published: October 2018

The technique of automated control over the composition and structure of metalworking equipment is examined based on a set of criteria. Multitude of alternative structures and technical and economic solutions to the problem of overhaul or local re-equipment of production is formed on the basis of the developed multi-layer graph model. The generated mathematical model is defined on the set of Boolean variables and implemented using linear programming methods. The choice of an effective composition and structure of technical means for equipping technological operations is based on the results of an analysis of evaluation criteria that determine technical, economic, production and financial indicators of an industrial enterprise, as well as partial indicators of quality and competitiveness of production facilities.
Definition of the initial information for selecting the cutting tool for automated production preparation
Authors: Golovko Aleksandr , Petrov Sergey
Published: October 2018

The certain supply of cutting tools is formed on the machine-building enterprises of the parts group related to tooling as a result of application of technological processes. At preproduction of new pats group it is necessary to be determined with the choice of tool: to project special or to apply already present. In second case it is required to find from a database a suitable tool on totality of preset parameter. The large variety of constructions and methods of application of cutting tools hampers such choice. The article presents the initial information for selecting a cutting tool for automated production preparation.
Application of the criterial approach for the choice of forming technology for rod fasteners
Authors: Zhelezkov Oleg , Malakanov Sergey , Galiahmetov Timur
Published: October 2018

The article presents the results of the application of the developed complex criterial approach for evaluating the production processes of fasteners such as bolts with hexagon head. An estimation of two technologies for manufacturing bolts was made, based on the criterial evaluation, the most rational production variance was selected.
Mathematical model for determination of the most advantageous conditions for formation of parts of aerospace engineering on the operations of the end milling
Authors: Skuratov Dmitriy L. , Evdokimov Dmitriy V. , Fedorov Dmitriy G.
Published: October 2018

A mathematical model has been introduced for determining the most advantageous conditions for parts formation when end milling operations. This model consists of a linear objective function and linear inequality constraints and takes into account the kinetics of thermal processes in the cutting zone. The equation determines the processing time was used as the objective function and constraint inequalities are related with the functional parameters and the parameters of the milling process and determines the quality of the machining.
Multi-criteria planning model of engines parts additive manufacturing
Authors: Kokareva Victoria , Agapovichev Anton , Sotov Anton , Smelov Vitaliy , Sufiiarov Vadim
Published: October 2018

This paper reviews the state-of-the-art of an additive process planning methods amd models. Paper deals with the literature review of the planning process of additive manufacturing. The study also demonstrate multi-criteria planning model of engines parts additive manufacturing using multi-attributes decision-making problems approach.
Forming and developing engineering technology as a science
Authors: Suslov Anatoly G. , Petreshin Dmitry I.
Published: October 2018

The origin of engineering technology and its formation as a science is stated. The stages of developing engineering technology and the names of scientists who have made a significant contribution to this development are given. The scientific directions of engineering technology further development are defined.
Efficiency increase in excavation control as primary reserve of performance increase for open-pit excavators
Authors: Lukashuk Olga , Letnev Konstantin , Komissarov Anatoliy
Published: October 2018

It is shown that controlling excavation of rock mass using an open-pit excavator with a front shovel as its operational equipment is quite a difficult task due to the complexity of control under almost nonstop adjustment of velocities of working motions (hoisting and thrusting). It was established that operation parameters of the main mechanisms depend on the type of path of motion and position of the bucket in the excavator’s work area. The process of excavation was algorithmically described, and kinematic transfer functions for the operational equipment mechanism were determined, characterizing correlations between the velocity of excavation and the velocities of working motions.
Perfection of constructive schemes of drive of running equipment of a career motor transport
Authors: Lagunova Yuliya , Ivanov Igor , Horoshavin Sergey
Published: October 2018

A comparative analysis of the main types of power equipment and transmissions of drives for running equipment for quarry vehicles was performed. The interrelations of the constructive schemes of drives of running equipment with traction class and carrying capacity of quarry vehicles are shown. Dependence of diesel engine power on air temperature and atmospheric pressure is revealed. An analysis of design schemes of transmissions of running equipment is given. Based on the evaluation of the design schemes, the directions for improving the drives of running equipment for quarry vehicles are given. As a result of the analysis of various types of drives and power equipment, it was revealed that when assembling the base machine, an individual approach should be applied.
Technology of calculation of the number of sensors sufficient for accurate measurement of the ice load pressure on the walls of the oil platform
Authors: Glech Sergei , Dushko Veronika , Blagovidova Irina , Kramar Vadim
Published: October 2018

The article is devoted to problem of calculation the necessary number of sensors that used to determine the ice loads pressure acting on the flat wall (with known dimensions) of oil-production platform.
Relative contact area in metal-polymer joints
Authors: Ogar Peter , Alpatov Yurij , Gorokhov Denis
Published: October 2018

The paper is devoted to the specification of the parameters of Bartenev-Lavrentiev’s empirical dependence for the relative area of contact with taking into account the mutual influence of asperities. The relative contact area is determined using a discrete roughness model for a wide range of distributions of the peaks of the asperities in the rough layer. It is shown that when determining the relative contact area, the distribution of the asperities in height practically does not affect the final result, since the obtained dependences coincide. This fact allowed us to determine the parameters of engineering dependence, which coincides with the results of theoretical studies.
Plough calculation peculiarities for walking tractors
Authors: Ovsyannikov Sergey , Kalinin Evgeniy
Published: October 2018

The influence of forces and moments on a plowing walking tractor is considered. The main regularities in calculating the component forces of resistance to the tool in the mode of digging and changing the treatment depth are determined. It is established that physical efforts of the operator, aimed at regulating the depth of soil treatment, significantly exceed the permissible.
Parametric diagnostics of the condition of a dual-flow turbojet engine using neural network simulation of the operating process
Authors: Gishvarov Anas S. , Raherinjatovo Julien Celestin
Published: October 2018

The article presents a method of parametric diagnostics of the condition of a dual-flow turbojet engine (DFTE). The method is based on the identification (determination) of the condition of the DFTE components (the compressor, combustion chamber, turbine) with application of a mathematical model of the operating process which is presented as an artificial neural network (ANN) model. This model describes the relation between the monitored parameters of the DFTE (the air temperatures (Tlpc*, Thpc*) beyond the low pressure compressor (LPC) and the high pressure compressor (HPC), the pressure beyond the LPC (Plpc), the fuel consumption rate (Gf), the gas temperatures (Thpt*, Tlpt*) beyond the high pressure turbine (HPT) and the low pressure turbine (LPT)) and the parameters of the condition of its components (the efficiencies of the LPC and the HPC (ηlpc*, ηhpc*), the stagnation pressure recovery factor in the combustion chamber (σcc), the efficiencies of the HPT and the LPT (ηhpt*, ηlpt*)). The parameters of the condition of the engine components (ηlpc*, ηhpc*, σcc, ηhpt*, ηlpt*) are the similarity criteria (integral criteria) which enable to identify the condition of the DFTE components to a high degree of reliability. Such analysis enables to detect defects at an early stage, even if the values of the monitored parameters (Тlpc*, Тhpc*, Plpc, Gf, Тhpt*, Тlpt*) are within the permissible limits. We provide the sequence for development of the ANN model and the results of its performance study during the parametric diagnostics of the condition of the DFTE.
Bioinspirated algorithm for multi-criterial problem solution of production schedule optimization
Authors: Chengar Olga , Shevchenko Victoria , Voronin Dmitrii
Published: October 2018

In the article the multi-criterial problem of production schedule synthesis of the machine-building enterprise has been considered. The proposed bioinspirated ant colony algorithm can be used to increase the quality the machining area functioning by considering simultaneously several factors that influence the efficiency of technological equipment loading.
Design of a device for rocks strength properties determining to solve the tasks of rock rock-cutting machines design
Authors: Dvornikov Leonid T. , Korneyev Viktor A.
Published: October 2018

The article presents methods for rocks strength properties determining in mining machines engineering in Russia, CIS countries and Europe. It is shown that general drawback of methods considered is lack of possibility of carrying out instant tests at various points in rock massif. Criteria are given for the method of rocks strength properties determining as applied to mining engineering tasks. Based on established criteria, the fundamentally new method has been developed. Technical devices are proposed for the method implementation in testing individual samples and rock massif. Construction of the laboratory stand estimating energy intensity of rock destruction is presented. Relationship between its value, coefficient of strength according to the M.M. scale of Protodyakonov and average particle size of the destroyed rock is shown.
Smart search for optimal technological processes in cyber-physical systems
Authors: Golovin Vasiliy
Published: October 2018

Digital production dictates new approaches to the organization of technological processes, including the development of cyber-physical systems within the framework of Industry 4.0. The development of these systems involves the use of not only classical methods, but also additive technologies in production. The article deals with the concept of a smart production system to find the optimal technological process, which is based on the user defined constraints and expert data of the cloud cyber-physical system.
Revealing the technological modes range for ultrasonic surface hardening of cast iron
Authors: Semenova Yulia , Nikitin Yuri , Rakhimyanov Andrey
Published: October 2018

Prospects of using the ultrasonic surface hardening of different materials as a way of achieving a simultaneous strengthening and finishing effects are presented. It is shown that this method is applicable for non-rigid and brittle parts. Thus, it allows processing gray cast iron. Therefore, the paper is devoted to establishing technologically significant parameters of ultrasonic surface hardening of particular gray cast iron. Research was conducted using mathematical modeling of the process. According to the calculations, the application of the modes revealed makes it possible to achieve the depth of the hardened layer up to 2 mm. Moreover, the parameters of the hardened layer, such as the diameter of a single imprint and the maximum intensity of deformation for specified processing conditions are calculated.
Modelling of magnetic field and flux in objects having surface-hardening and transition layer
Authors: Kostin Vladimir , Vasilenko Olga , Byzov Alexander
Published: October 2018

A finite element simulation of the distribution of the magnetic field and flux in locally magnetized steel objects subjected to surface hardening and having after hardening a three-layer structure: a hardened surface layer, a transition layer, an unstressed core; has been conducted. Magnetization of the tested object was conducted using a U-shaped electromagnet. As a result, pictures of the distribution of the magnetic field in the monitoring object were obtained. The values of induction depending on the depth of the hardened layer for a fixed transition layer at different points of space relative to the surface of the object of control are obtained.
The modeling of the process of grain material outflow from a hopper bin with a lateral outlet
Authors: Doroshenko Artyom , Butovchenko Andrey , Gorgadze Lyubov
Published: October 2018

Cleaning and sorting of agricultural materials are the essential processes in agricultural production. Many researchers have carried out important work on the study of optimizing the parameters of grain cleaning machines. One of these parameters, affecting the quality of machine, is the grain material outflow characterized by patterns of input velocities into the separation zone. The article describes the advantages and disadvantages of methods for determining the rate of grain material outflow expiration. Here is shown the model of heterogeneous bulky environment of outflow from the hopper with a lateral outlet in a software complex EDEM Simulation. The analysis of the obtained results with the use of contact model Hertz-Mindlin (no slip) with RVD Rolling Friction has demonstrated a significant sparseness of grain material outflow velocities in a steady state of 0,61 m/s to 0,72 m/s with an average 0,687 m/s for the specified parameters of a grain cleaning machine. The described method can be used to solve the problem of determining the rate of expiration of grain material in the design of grain cleaning machines with the subsequent optimization of their operation.
Simulation of the process of movement of bulk material in a vibrating conveyor-mixer
Authors: Tupolskikh Tatiana , Gucheva Natalia , Kirishiev Oleg
Published: October 2018

The article considers the hypothesis that one of the factors affecting the processes occurring in the tray is the nature of the vibration effect: frequency, amplitude, direction of oscillation. There arises the task of constructing a model of the motion of particles of granular medium in the tray of a vibrating conveyor-mixer. To solve the problem it is necessary to use two coordinate systems: movable and fixed.
Determination of the parameters of the hydrodynamic mixer
Authors: Ivanov Yuri , Pakhomov Viktor , Kambulov Sergei , Rudoi Dmitri
Published: October 2018

Many technologies of the agro-industrial complex are associated with the need for a quality blending of two or more components. These include the processes of obtaining biodiesel fuel based on vegetable oils, obtaining aqueous emulsions of fats in the production of mixed fodders. In this process, the most effective is the use of a hydrodynamic mixer, the main design parameters of which are determined in the process of investigation. The design of a nozzle with a variable cross-sectional area is calculated, which allows to control the mixing process. The obtained mathematical dependences quite fully characterize the features of the work and the requirements for the design of the ejector installed in the hydrodynamic mixer to create cavitation with the required intensity.