bluuebunny/crossref_metadata_2025 huggingface dataset:
Stereomeric resolution and modeling ofdl-alanine-dl-phenyl alanine dipeptide on an AmyCoat-RP column
Authors: Al-Shaalan Nora Hamad , Ali Imran , ALOthman Zeid A. , Al-Wahaibi Lamya Hamad , Alabdulmonem Hadeel
Published: November 2019

Stereomeric resolution and docking studies of four stereomers ofdl-alanine-dl-phenyl alanine dipeptide were performed with an AmyCoat-RP column.
Internal standardization as a strategy to overcome non-spectral interferences in the determination of As, Cd and Pb in mineral fertilizers by synchronous vertical dual view (SVDV) ICP OES
Authors: Machado Raquel C. , Silva Ana Beatriz S. , Amaral Clarice D. B. , Virgilio Alex , Nogueira Ana Rita A.
Published: November 2019

Internal standardization is an effective strategy to minimize non-spectral interferences during contaminant determination in mineral fertilizers by SVDV ICP OES.
Tirapazamine-embedded polyplatinum(iv) complex: a prodrug combo for hypoxia-activated synergistic chemotherapy
Authors: Guo Dongbo , Xu Shuting , Yasen Wumaier , Zhang Chuan , Shen Jian , Huang Yu , Chen Dong , Zhu Xinyuan
Published: November 2019

A polyprodrug complex containing oxygen depleting chemodrugs and hypoxia-activated antitumor agents can serve as a promising drug delivery system for synergistic chemotherapy.
PMP–diketopiperazine adducts form at the active site of a PLP dependent enzyme involved in formycin biosynthesis
Authors: Gao Sisi , Liu Huanting , de Crécy-Lagard Valérie , Zhu Wen , Richards Nigel G. J. , Naismith James H.
Published: November 2019

ForI is a PLP-dependent enzyme from the biosynthetic pathway of the C-nucleoside antibiotic formycin.
A local hydrophobic environment in a metal–organic framework for boosting photocatalytic CO2 reduction in the presence of water
Authors: Huang Ning-Yu , Zhang Xue-Wen , Xu Yu-Zhi , Liao Pei-Qin , Chen Xiao-Ming
Published: November 2019

The methylene groups surrounding the metal center in a metal–organic framework provide hydrophobic repulsive forces to H2O, resulting in a high catalytic activity (TOF = 73.8 h−1, selectivity of 96%) for photodriven CO2 reduction into CO.
To bend or not to bend, the dilemma of multiple bonds
Authors: Pizzochero Michele , Bonfanti Matteo , Martinazzo Rocco
Published: November 2019

Beyond the second row of the periodic table, the nature of the multiple bonds between main group elements remains yet elusive. At a closer look they turn to be more similar to their second-row counterparts than previously believed.
Unraveling the regioselectivity of odd electron halogen bond formation using electrophilicity index and chemical hardness parameters
Authors: Bandyopadhyay Prasanta , Ray Soumyadip , Seikh Md. Motin
Published: November 2019

1e and 3e regioselective XB formation by a free radical. 1e and 3e bond formation are realized when the free radical acts as nucleophile and electrophile, respectively, which are parametrized by electrophilicity index and chemical hardness parameters.
Defense and inhibition integrated mesoporous nanoselenium delivery system against tomato gray mold
Authors: Liu Jiawei , Zhu Xufeng , Chen Xu , Liu Yanan , Gong Youcong , Yuan Guanglong , Liu Jie , Chen Lanmei
Published: November 2019

Three modes of administration of TM@Se@PAA NPs and its application in plants.
Catalytic chemistry of iron-free Fenton nanocatalysts for versatile radical nanotherapeutics
Authors: Chen Qiqing , Yang Dayan , Yu Luodan , Jing Xiangxiang , Chen Yu
Published: November 2019

This review summarizes and discusses the construction of iron-free Fenton nanocatalysts for versatile biomedical applications. The facing challenges and future developments of these iron-free Fenton nanocatalysts for clinical translation are also outlooked.
Nano-SiO2 coating enabled uniform Na stripping/plating for dendrite-free and long-life sodium metal batteries
Authors: Jiang Fuyi , Li Tianjiao , Ju Peng , Sun Jianchao , Liu Chuang , Li Yiwei , Sun Xueqin , Chen Chengcheng
Published: November 2019

Metallic sodium, which has a suitable redox potential and high theoretical capacity, is regarded as an ideal anode material for rechargeable Na metal batteries.
Microstructure refinement in W–Y2O3 alloys via an improved hydrothermal synthesis method and low temperature sintering
Authors: Hu Weiqiang , Dong Zhi , Ma Zongqing , Liu Yongchang
Published: November 2019

In order to prepare high performance oxide-dispersion-strengthened tungsten-based alloys, W–Y2O3 composite nanopowders were prepared using an improved hydrothermal synthesis method with the addition of the surfactant polyvinyl pyrrolidone (PVP).
Graphene-nanoscroll-based Integrated and self-standing electrode with a sandwich structure for lithium sulfur batteries
Authors: Guo Yi , Zhang Yin , Sun Yali , Zhang Yun , Wu Hao
Published: November 2019

A sandwich-like and self-standing electrode integrating a current collector, active material and interlayer provides multifunctional polysulfide-trapping ability in lithium sulfur batteries.
Total syntheses of (−)-15-oxopuupehenol and (+)-puupehenone and formal syntheses of (−)-puupehenol and (+)-puupehedione
Authors: Song Huayue , Liu Lin , Yang Mingyang , Wu Guangmiao , Chen Peng , Xie Xingang , She Xuegong
Published: November 2019

A concise collective synthesis of (−)-15-oxopuupehenol, (+)-puupehenone, (−)-puupehenol and (+)-puupehedione has been accomplished.
One-pot generation of benzynes from 2-aminophenylboronates via a Rh(ii)-catalyzed N–H amination/oxidation/elimination cascade process
Authors: Ito Motoki , Tanaka Arisa , Hatakeyama Keiju , Kano Emi , Higuchi Kazuhiro , Sugiyama Shigeo
Published: November 2019

Rh(ii)-Nitrene-mediated N–H amination of 2-aminophenylboronates triggered a cascade of oxidation/elimination processes resulting in the generation of benzynes.
Ag-Catalyzed cycloisomerization of 1,6-enynamide: an intramolecular type II Alder-ene reaction
Authors: Shen Mei-Hua , Zhang Yu-Mei , Jiang Chun , Xu Hua-Dong , Xu Defeng
Published: November 2019

An unusual type II Alder-ene cycloisomerization of 1,6-enynamide to fused bicyclic N-heterocycles is achieved by silver catalysis. 6-Endo-trig cyclization of a keteneiminium silver intermediate is proposed as the key step.
Asymmetric total synthesis of nodulisporiviridin E
Authors: Ji Yang , Xin Zhengyuan , Shi Yingbo , He Haibing , Gao Shuanhu
Published: November 2019

The asymmetric total synthesis of (+)-nodulisporiviridin E was achieved in 16 steps. This convergent approach provides an advanced Michael acceptor, which might facilitate the preparation of various analogues and derivatives for biological studies.
Halogenation of graphene triggered by heteroatom doping
Authors: Olanrele Samson O. , Lian Zan , Si Chaowei , Li Bo
Published: November 2019

Heteroatoms doping synergize the interactions between diatomic halogens and graphene.
Patterned films of a hybrid lead halide perovskite grown using space-confined conversion of metallic lead by reactive polyiodide melts
Authors: Grishko Aleksei Y. , Petrov Andrey A. , Goodilin Eugene A. , Tarasov Alexey B.
Published: November 2019

A unique technique for preparation of thin patterned perovskite films is suggested based on an interaction of reactive polyiodide melts with metallic lead coatings using a patterned die with a given relief.
Alchemilla vulgaris agg. (Lady's mantle) from central Balkan: antioxidant, anticancer and enzyme inhibition properties
Authors: Vlaisavljević Sanja , Jelača Sanja , Zengin Gökhan , Mimica-Dukić Neda , Berežni Sanja , Miljić Milorad , Stevanović Zora Dajić
Published: November 2019

The current study was designed to evaluate the phytochemical profile and biological properties of extracts of Alchemilla vulgaris from Southeast Serbia which was traditionally used to alleviate and treat many diseases.
Separation of halogenated benzenes enabled by investigation of halogen–π interactions with carbon materials
Authors: Kanao Eisuke , Morinaga Takuya , Kubo Takuya , Naito Toyohiro , Matsumoto Takatoshi , Sano Tomoharu , Maki Hideshi , Yan Mingdi , Otsuka Koji
Published: November 2019

We report the existence of bimodal interactions, the π–π and halogen–π interactions, between the halogenated benzenes and aromatic materials.
Dynamics control of an in-plane-switching liquid crystal cell using heterogeneous substrates
Authors: Lee Kuang-Wu , Araki Takeaki , Yamamoto Jun
Published: November 2019

Cell-depth dependent master curves are found in the transmittance/recovery phase space, for a IPS-LCD configuration using heterogeneous substrates.
Enhanced microphase separation of thin films of low molecular weight block copolymer by the addition of an ionic liquid
Authors: Li Dongxue , Zhou Chun , Xiong Shisheng , Qu Xin-Ping , Craig Gordon S. W. , Nealey Paul F.
Published: November 2019

Enhanced microphase separation of a high-χ block copolymer by adding a selective ionic liquid to the block copolymer in solution.
Improved mesostructured oxygen electrodes for highly performing solid oxide cells for co-electrolysis of steam and carbon dioxide
Authors: Anelli S. , Baiutti F. , Hornés A. , Bernadet L. , Torrell M. , Tarancón A.
Published: November 2019

Next-generation mesoporous cerium oxide scaffolds are synthesized for the fabrication of highly performing solid oxide cells by introducing a hard-template nanocasting synthesis route which comprises chemical post-treatments.
Carbon–metal compound composite electrodes for capacitive deionization: synthesis, development and applications
Authors: Tang Kexin , Hong Terence Zhi Xiang , You Liming , Zhou Kun
Published: November 2019

This review comprehensively discusses the application of carbon–metal compound composites as CDI electrodes paying special attention to their synthesis–structure–desalination performance relationships.
Sulfur covalently bonded to porous graphitic carbon as an anode material for lithium-ion capacitors with high energy storage performance
Authors: Sun Yue , Ma Junpeng , Yang Xinyue , Wen Liping , Zhou Weidong , Geng Jianxin
Published: November 2019

Sulfur covalently bonded to porous graphitic carbon is utilized as an anode for lithium-ion capacitors with high energy storage performance.
Non-halogenated-solvent-processed highly efficient organic solar cells with a record open circuit voltage enabled by noncovalently locked novel polymer donors
Authors: Guo Hui , Zhang Youdi , Chen Lie , Liao Xunfan , Xie Qian , Cui Yongjie , Huang Bin , Yang Changduk , Chen Yiwang
Published: November 2019

The difluorine and carboxylate substitutions can effectively down-shift the HOMO level of the donors, improved molecular face-on orientation and reduced energy loss.
Guanidinium doping enabled low-temperature fabrication of high-efficiency all-inorganic CsPbI2Br perovskite solar cells
Authors: Ma Junjie , Qin Minchao , Li Yuhao , Zhang Tiankai , Xu Jianbin , Fang Guojia , Lu Xinhui
Published: November 2019

Efficient guanidinium-doped CsPbI2Br PSCs were fabricated at a low temperature. In situ GIWAXS measurements were performed to understand the crystallization process.
Spectator cation size effect on the work function and stability of self-compensated hole-doped polymers
Authors: Ang Mervin Chun-Yi , Koh Qi-Mian , Tang Cindy Guanyu , Seah Qiu-Jing , Wang Yu , Callsen Martin , Feng Yuan-Ping , Png Rui-Qi , Chua Lay-Lay
Published: November 2019

Spectator cations not only influence the ionization energy (and work function) of polyelectrolyte, but also, surprisingly determine the stability of the ultrahigh workfunction state.
Fabrication of indium gallium zinc oxide phototransistors via oxide-mesh insertion for visible light detection
Authors: Kim Dongwoo , Kim Yeong-gyu , Kang Byung Ha , Lee Jin Hyeok , Chung Jusung , Kim Hyun Jae
Published: November 2019

Visible light detection of oxide phototransistors via insertion of an oxide-mesh inside the channel creating oxygen vacancies that increase subgap states.
Dynamics of a charge‐controlled memristor in master–slave coupling
Authors: Isah A. , Nguetcho A.S. Tchakoutio , Binczak S. , Bilbault J.M.
Published: November 2019

The application of memristor in non‐linear diffusive network is introduced. A charged‐controlled memristor model is used in the quantitative study of pixel‐to‐pixel communication via a memristor. To quantitatively understand the behaviour of the system, the authors emphasised on two cells: master and slave. Information is launched from the master cell to the slave cell through a memristor and the dynamics, as well as, the saturation of the system is observed.
Acceleration of superrotation in simulated hot Jupiter atmospheres
Authors: Debras F. , Mayne N. , Baraffe I. , Jaupart E. , Mourier P. , Laibe G. , Goffrey T. , Thuburn J.
Published: November 2019

Context. Atmospheric superrotating flows at the equator are a nearly ubiquitous result when conducting simulations of hot Jupiters. One theory explaining how this zonally-coherent flow reaches equilibrium has already been developed in the literature. This understanding, however, relies on the existence of either an initial superrotating flow or a sheared flow, coupled with a slow evolution that permits a linear steady state to be reached.

Aims. A consistent physical understanding of superrotation is needed for arbitrary drag and radiative timescales, along with the relevance of taking linear steady states into account, needs to be assessed.

Methods. We obtained an analytical expression for the structure, frequency, and decay rate of propagating waves in hot Jupiter atmospheres around a state at rest in the 2D shallow-water β-plane limit. We solved this expression numerically and confirmed the robustness of our results with a 3D linear wave algorithm. We then compared it with 3D simulations of hot Jupiter atmospheres and studied the nonlinear momentum fluxes.

Results. We show that under strong day-night heating, the dynamics do not transit through a linear steady state when starting from an initial atmosphere in solid body rotation. We further demonstrate that nonlinear effects favor the initial spin-up of superrotation and that acceleration due to the vertical component of the eddy-momentum flux is critical to the initial development of superrotation.

Conclusions. We describe the initial phases of the acceleration of superrotation, including the consideration of differing radiative and drag timescales, and we conclude that eddy-momentum-driven superrotating equatorial jets are robust, physical phenomena in simulations of hot Jupiter atmospheres.
The Hayabusa2 lander MASCOT on the surface of asteroid (162173) Ryugu – Stereo-photogrammetric analysis of MASCam image data
Authors: Scholten F. , Preusker F. , Elgner S. , Matz K.-D. , Jaumann R. , Hamm M. , Schröder S. E. , Koncz A. , Schmitz N. , Trauthan F. , Grott M. , Biele J. , Ho T.-M. , Kameda S. , Sugita S.
Published: November 2019

After its release and a descent and bouncing phase, the Hayabusa2 lander MASCOT came to a final rest and MASCOT’s camera MASCam acquired a set of images of the surface of Ryugu. With MASCam’s instantaneous field of view of about 1 mrad, the images provide pixel scales from 0.2 to 0.5 mm pixel−1in the foreground and up to 1 cm pixel−1for surface parts in the background. Using a stereo-photogrammetric analysis of the MASCam images taken from slightly different positions due to commanded and unintentional movements of the MASCOT lander, we were able to determine the orientation for the different measurement positions. Furthermore, we derived a 3D surface model of MASCOT’s vicinity. Although the conditions for 3D stereo processing were poor due to very small stereo angles, the derived 3D model has about 0.5 cm accuracy in the foreground at 20 cm distance and about 1.5 cm at a distance of 40–50 cm.
Characteristics Of Aluminium ADC 12/SiC Composite with the Addition of TiB and Sr Modifier
Authors: Indarsari Astari , Syahrial Anne Zulfia , Utomo Budi Wahyu
Published: November 2019

The addition of silicon carbide (SiC) as a reinforce in a composite can improve mechanical properties. In this study aluminium ADC 12 (Al-Si-Aluminium Alloy) is treated with an addition of SiC varied from (1; 1.5; 2; 2.5 to 3) vf% and mixed with 0.18 wt% Sr to change the morphology of the silicone eutectic phase and 0.15 wt% titanium boron (TiB) was added as a grain refiner as well as the addition of 5 wt% magnesium (Mg) to increase the wettability. All materials were fabricated by stir cast method. This research is conducted to obtain the candidate material for application in train's brake shoe and bearing. This kind of usage requires high mechanical properties such as wear resistance, thermal resistance, good elastic modulus and lightweight. The composites were characterised by both mechanical properties and microstructure. The result shows that there is an increase in the mechanical properties of aluminium ADC 12 /SiC composite compared to unreinforced with the value of 144 MPa of strength, 53 HRB of hardness, and 0.0049 mm3 m–1 of wear rate. As a result, the higher addition of the SiC results in the better mechanical properties for the composite.
Container Ship Accident Analysis due to Container Stacked on Deck as an Attempt to Improve Maritime Logistic System
Authors: Priapalla Rahim Gafero , Sunaryo
Published: November 2019

This paper analyses factors that might cause accidents to the container ships due to containers stacked on deck, and propose applicable actions to minimize these factors. The number, capacity, and speed of hatch-coverless container ships worldwide have increased significantly since the latest decade due to the increase of world trade. There is also a trend of stacking more containers on deck in order to increase the capacity of the ships. This phenomenon makes the number of container ship accidents also increasing; particularly capsize or sink. Even though merchant ships have to comply with safety rules and regulations, but the number of accidents still significantly high. The accidents usually cause great loses to the cargo and damage the overall logistic system. The sources of container ship accidents can be categorized into the ship itself, the environment, human factor, and management. In this study, accidents data and related information were gathered through literature study, on the spot observation, and direct interviews with relevant parties. Causes of accidents were then identified using cause and effect analysis. Based on the findings from the analysis, options for overcoming them were simulated to obtain the most applicable solutions that would minimize the accidents.
Probabilistic Evaluation of Fatigue Crack Growth Rate for Longitudinal Tungsten Inert Gas Welded Al 6013-T4 Under Various PostWeld Heat Treatment Conditions
Authors: Wicaksana Ekaputra I Made , Dwi Haryadi Gunawan , Mardikus Stefan , Dewa Rando Tungga
Published: November 2019

In this study, a Monte Carlo method (MCM) was applied on the fatigue crack growth rate (FCGR) curves to evaluate a probabilistic assessment for the welded longitudinal Al 6013-T4 aluminum alloy under various post-weld heat treatment (PWHT) conditions. The welded CT specimens were manufactured by a tungsten inert gas (TIG) welding, and the fatigue crack growth (FCG) tests were conducted by following ASTM E647. Before conducting the FCG test, the PWHT conditions were applied to the welded CT specimens under three different aging times of 6 h, 18 h, and 24 h at 175 C. The FCGR curves were generated from the FCG data and plotted on the da/dN versus Δk curves. The constants C and m were determined by drawing the fitting line on the FCGR curves. A sizeable random number was generated from the obtained constants by MCM. By plotting these constants, the probabilistic assessment of FCGR was determined on the da/dN versus Δk curves. The results showed that the confidence interval was appeared on the FCGR curves and limited by the upper and lower probabilistic lines. It was found that the lower and upper probabilistic lines were formed at 1 % and 90 %, respectively.
Interrelation of microstructure and thermodynamic parameters in TiNi alloy during multiple martensitic transformations
Authors: Churakova Anna
Published: November 2019

The effect of multiple martensitic transformations on the microstructure and thermodynamic parameters of the alloy of the TiNi system was investigated. It was shown that in the Ti50Ni50 alloy, with an increase in the number of thermal cycles with rapid heating and cooling up to n = 100, a consistent increase in the dislocation density occurs, and a decrease in the width of martensitic plates is observed. And also, that in TCs with fast heating and cooling of the Ti50Ni50 alloy in a coarse-grained state, a change in the trend in the temperatures of martensitic transformations is observed — with an increase in the number of thermal cycles to n = 50, they decrease, and at n> 50 the temperatures increase.
Modeling of failures of the starter electric motor
Authors: Puzakov Andrey
Published: November 2019

Failures of automotive starters make it impossible to reliably start internal combustion engines, which, under adverse circumstances, may cause a risk of road traffic accidents. A significant part of starter failures is associated with electrical faults in electric motors. The occurrence and development of failures causes a change in the torque produced by the starter. A mathematical model of the starter’s performance dependant from the magnitude of the electrical resistance of its windings was developed. Physical modeling of failures was carried out using an adjustable active resistance connected in series and parallel to the armature winding. Critical values of electrical resistance correspond to an open and short circuit of the armature winding of the starter electric motor, and, consequently, to starter failure. The results obtained are instrumental to the development of a diagnostics method for automotive starters without removing them from the motor.
Arctic Climate Insulation Systems
Authors: Umnyakova Nina , Bessonov Igor , Zhukov Alex , Zinoveva Ekaterina
Published: November 2019

The article describes the features of the implementation of insulation systems in extreme climatic conditions, including in conditions of significant negative and alternating temperatures, high wind speeds and more. It is noted that the adaptation of building systems to similar operating conditions places special demands on heat-insulating materials, as well as resistance to mechanical and climatic influences, vapor permeability, and stability of properties for the entire period of operation. Taking into account the temperature regime of the polar territories, it becomes necessary to develop special solutions for the creation of insulating shells that have high heat engineering uniformity and durability, as well as those that are resistant to very negative and alternating temperatures. Also important is the heat, moisture, and vapor barrier properties of these systems. Taking into account the operational features of the polar territories, three main groups of objects requiring complex isolation and protection can be distinguished: residential buildings, roads on permafrost, modular buildings and residential capsules of mobile equipment. The article considers the feasibility of implementing such heat-efficient systems using foamed plastics, namely products based on extruded polystyrene foam and foamed polyethylene. Solutions are proposed for the implementation of overlaps over ventilated cellars, insulation of walls, roads and mobile structures.
Mode parameters control under GMAW in connection with reflected heat flow
Authors: Melnikov Anton , Sholokhov Mikhail , Buzorina Darya , Fiveyskiy Andrei
Published: November 2019

The present article presents the research results of the heat flow reflection from the edge of the work-piece. Based on the results of a mathematical modeling, we determined the regression equations of the correspondence between the size of the heat reflection zone and the studied parameters and an algorithm for choosing the parameters of the welding mode in the conditions of thermal field distortion due to heat reflection from the edge was developed.
The use of industrial wastes from machine-building enterprises as packing materials for small-sized absorbers for gas emissions purification
Authors: Merentsov Nikolay , Persidskiy Alexander , Lebedev Vitaliy , Golovanchikov Alexander
Published: November 2019

The paper covers the prospects to use industrial wastes from machine-building enterprises, appearing while machining various steel grades, as packing materials for industrial absorbers for environmental cleaning processes of gas emissions. The article provides obtained and processed in the criterial way experimental data in hydrodynamics of a packing material sample from metal working machines wastes appearing while treating Aisi 316Ti steel bars; packing material according to the classification method for processing experimental data λ=f(Rem) is oriented to the absorption process during selective gas cleaning in environmental equipment. The authors have compared the studied packing material to the packing that are widely used in industries. The authors have studied the main experimentally confirmed hydrodynamic effects indicating the high efficiency of the proposed packing material. The authors have made calculations for a small-sized industrial absorber for cleaning gas emissions with the use of the studied packing material.
Principal issues of innovation activity development at machine building companies
Authors: Blinkov Oleg
Published: November 2019

The article is dedicated to the principal issues of innovation activity development at machine building companies. It considers a method to create a portfolio of innovative solutions, whose implementation would allow the company to solve the issues and increase competitiveness of the company’s products.
Study of the characteristics of a sliding bearing under dynamic loading
Authors: Gorin Andrei , Sytin Anton , Rodichev Alexey
Published: November 2019

The article discusses the prerequisites and the process of creating an experimental bench for the study of external electromagnetic effects on rotor-bearing units in the work process. The control systems of the experimental setup and the electromagnetic device are presented, the latter is made in the form of 4 paired orthogonally located electromagnets. The percussion device can operate in a programmable mode. Flexible variation in speed and magnitude of the impact (according to a predetermined law of change) allows you to cover a wide range of possible external influences on the rotor unit. The tool for the automatic control of installation modules, as well as the collection and processing of experimental data, is software developed in the LabView visual programming environment. The drivers for matching the frequency converter and the controller, as well as all the software for the operation of the information-measuring system, the experiment and data processing, were written in the graphic programming language.
Effect of concentration and dispersion of filler fractions on adhesive strength and abrasion resistance of an epoxy and sand composite
Authors: Mikhalchenkov Alexander , Mikhalchenkova Marina , Feskov Sergey , Kononenko Alexandr
Published: November 2019

The increase in the adhesive strength of the epoxy and sand composite is equally regulated by the content of the sand component and the dispersiveness of its particles. The wear resistance of the composite is mainly determined by the size of sand particles, and the concentration significantly affects the degree of resistance to abrasive wear only when the fraction dispersiveness is equal to 1 mm. The maximum adhesive strength and wear resistance are characteristic for a composite of the following composition: 30 pts. wt. epoxy glue and 70 pts. wt. natural sand with a dispersiveness of 1 mm.
Determining optimal kinematic parameters of a screen shoe used for separating breeding seed samples
Authors: Moskovskiy Maksim , Khamuev Victor , Dorokhov Aleksei , Gerasimenko Stanislav
Published: November 2019

In the post-harvest processing of breeding material, the absence of a sieve machine of appropriate productivity that meets all the requirements for breeding machines is relevant today. For research, a mock stand of the sieve machine was used, on which the kinematic parameters of the sieve mill and the tilt angles of the sieves were determined.
To the question of constructing measuring devices based on fluxgate sensors
Authors: Nikishechkin Anatolij
Published: November 2019

The article discusses the issues of feeding fluxgates from compact, low-power generators built on AND-NOT logic elements. The frequency of such generators depends on the magnitude of the measured magnetic field strength. This gives reason to consider the possibility of using frequency as a useful signal. The article discusses the issues of feeding fluxgates from compact, low-power generators built on AND-NOT logic elements. The frequency of such generators depends on the magnitude of the measured magnetic field strength. This gives reason to consider the possibility of using frequency as a useful signal. The article proposes to use modulated rectangular voltage pulses, that is, pulses with high-frequency filling, to power a fluxgate. Then, under the influence of the measured magnetic field, the filling frequency changes, according to which the magnitude of the intensity is determined, and the frequency of the modulating voltage corresponding to the passport frequency of the fluxgate remains constant. In this case, it becomes possible to increase the deviation of the filling frequency due to the use of the released output winding of the fluxgate as an additional element of the generator. It was also experimentally established that in order to increase the voltage on the excitation winding of the fluxgate and, as a consequence, to increase its sensitivity, it is advisable to power through the D-trigger, which makes it possible to obtain bipolar voltage on the excitation winding. In addition, it is necessary to use resonance phenomena (at the frequency of the modeling voltage) in the serial circuit “connecting capacitors - excitation coil of a fluxgate”, which allows increasing the voltage on the excitation winding without increasing the voltage of the power source.
Alterations in the microhardness of a titanium alloy affected to a series of nanosecond laser pulses
Authors: Ushakov Ivan , Simonov Yuri
Published: November 2019

The alterations in the microhardness of a titanium alloy Ti85.85Al6.5Zr4Sn2Nb1Mo0.5Si0.15 subjected to laser treatment were investigated. Laser processing consists of a series of pulses with durations 20 ns. We used various methods of laser processing, which differed in power density, wavelength, geometrical pattern of irradiation and so on. The dependences of the microhardness on the load on the indenter were found. The laser processing modes providing the increased microhardness are determined. The investigations were carried out at loads from 0.49 N to 4.9 N, with maximum indentation depth of the Vickers pyramid up to 12 μm. Vickers microhardness can be increased by 20 – 40 %. At the same time, the plastic properties of the hardened layer are improved. The probability of crack formation during indentation of the initial alloy increased with a load on the indenter and reached 0.52 for a load of 4.9 N. In two of the treated areas of the three presented, crack formation was not recorded at any load. The mechanisms of hardening of the material surface layer under the influence of a laser pulse are discussed. Using the methods of computational mathematics, the character of sample heating under the influence of a single laser pulse is determined. The perspectives for the development of the proposed processing method are permitting to obtain the optimal mechanical properties of the hardened layer are discussed.
Of the matrics of the equilibrium of the rod formation system based on the principle the duality of the problems of structures mechanics
Authors: Monakhov Vladimir
Published: November 2019

The formation of the equilibrium matrix of the core system in the matrix form is based on the use of the mechanical model of the system obtained by its discretization. The topological structure of the model is set using the graph and the accompanying incidence matrix. The matrix transformation of the vector of nodal displacements in combination with the extended incidence matrix allows determining the absolute elongations and distortions of each finite element. The composition of only two matrices (matrix of incidence and lengths of elements) and the skew vector leads to a geometric matrix characterizing the dependence of concentrated bending deformations in the calculated cross sections of the core system from the nodal displacements for a given load. Based on the duality principle, by transposing the geometric matrix, the equilibrium equation of the core system is derived in matrix form.
Prospects for using aluminum matrix composite materials in the automotive industry
Authors: Romanov Ivan , Romanova Elena , Chernyshov Evgeny
Published: November 2019

The scope of the use of aluminum-alloy-based metal-matrix composite materials has been expanding in recent years. However, the high cost of raw materials is a considerable deterrent to the widespread implementation of products made of such composites. Therefore, the ranges of the said materials commercial application are yet inadequate to their technical and operational capabilities. So, methods of making metal-matrix composite materials directly from a liquid melt are currently of interest. This paper presents the theoretical studies and the results of practical experiments for the production of metal-matrix composite material by the internal oxidation method. There are described the results of mechanical tests and the microstructure of specimens confirming theoretical assumptions in the oxidation of aluminum melt array. A comparative analysis is given for the cost of producing an alloy containing 30% of Al2O3 particles obtained by adding the Al2O3 powder and an alloy obtained by the internal oxidation of the aluminum melt. The studied technology provides for the formation of aluminum oxide directly in the aluminum melt, thus enabling to produce a composite material by a single-stage process and ensuring the process efficiency.
Interfacing between the control ratio of mining excavator and an operator’s proficiency level
Authors: Velikanov Vladimir , Dyorina Natalja , Rabina Ekaterina
Published: November 2019

The role of a mining machine operator gradually reduces to monitoring and managing a technological facility in difficult situations as mining automation increases. The increasing complexity of mining technology leads to the fact that the driver’s qualification must be very high in accordance with the requirements of modern mining processes. The main characteristics of the work of the career excavator driver in the «man-machine-environment» system are faultlessness, speed, accuracy, reliability. The effectiveness of the entire system depends on how the human operator’s participation will be organized in the process of managing the facility.
Ontological approach to the formation of subject-oriented knowledge bases in the field of computer-aided design
Authors: Cherepashkov Andrey , Sharaukhova Anastasia
Published: November 2019

The problem of the formation of subject-oriented knowledge bases in the subject area of operation of computer-aided design systems is discussed. One of the trends in the development of CAD systems is their intellectualization through the development of a system-wide environment, including the means of methodological support of the design activities of users. It is proposed to use the otological approach in identifying and updating the content of knowledge bases used by target CAD personnel. The results of an experiment on the development of a targeted taxonomy in the subject area of computer-aided design of engineering products are presented.
Development of the model of input control of timber for the enhancement of operational performance of sawn stream
Authors: Eliseev I.V. , Shifrin B.M. , Sokolova V.A.
Published: November 2019

In this article, a task of enhancement of the operational performance of modern sawing equipment, is set and solved. One of the necessary element thereof is to install scanners of presence of metal inclusions (metal detectors) on the feed line of bolt timber. In this article the control object under observation is the small sawing line based on two round-sawing machines KARA MASTER. It is proposed for the line that a classic technological scheme should be modified in a way the bolt timber, moving through a conveyor, to be passing an aperture of metal detector. In this article, the approach for algorithmization and programming of the control system is proposed to be SWITCH-technology and the corresponding area of programming, an automata-based programming. This technology, made a perfect showing for controlling of various objects, is proposed to be introduced for developing of models of typified technological process of small timber sawing. The first section in your paper.
The effect of the surface structure of titanium alloy medical screws on their wear resistance
Authors: Skvortsova Svetlana , Spektor Viktor , Pozhoga Oksana , Gvozdeva Olga
Published: November 2019

In this work, the effect of vacuum ion-plasma treatment on the wear resistance of the medical screws surface made of VT6 titanium alloy is studied as well as on the mechanical characteristics of the screws in contact with the plate for osteosynthesis. It is shown that the TiN titanium nitride deposition on the screw head increases the surface microhardness by 3 times and also provides lowering the torque during removal of the screw out of the plate.
Research of the mixing process in vortex static type devices
Authors: Afanasenko Vitaliy , Kulakov Petr
Published: November 2019

Mixing in chemical technology is used to intensify chemical and heat-mass transfer processes, as well as for preparing emulsions, suspensions and obtaining homogeneous systems. The simplest way to carry out the process, which does not require an additional supply of mechanical energy, is to mix in a direct-flow environment, which only requires flow energy. Analysis of the existing designs of direct-flow mixers showed that the use of swirling devices of various types in order to increase the efficiency of the process is very promising. This article describes a study of the influence of the geometrical dimensions of the screw on the efficiency of mixing a two-component mixture using the FlowVision software package.
New approach to the organization of entrances to cities using ITS
Authors: Dorokhin Sergey , Chirkov Evgenii , Postavnichii Sergey
Published: November 2019

The article analyses the use of intelligent transport systems, as a result of the study, the authors found that in large cities today, intelligent entries are not used much, which reduces the load on the entry areas. The authors propose an algorithm for organizing entry on the example of Voronezh and propose a method for passing vehicles on the main and secondary roads, as a result of which the efficiency of organizing traffic to large cities is obtained.
Promising agrofibers based on biodegradable polymers
Authors: Tertyshnaya Yulia , Levina Nelly , Podzorova Maria , Bidey Irina
Published: November 2019

Nonwoven fibrous materials from biodegradable polymers: polylactide and poly-3-hydroxybutyrate were obtained. Water vapor sorption by nonwoven fiber samples was investigated. It was determined that the substrate of non-woven material does not have a negative impact on the growth and development of cress plants. It is shown that the studied fiber samples are actively subjected to destruction in the soil, on the sample of PLA-PHB composition is decomposed faster than pure PLA.
Risk analysis in digital twin creation of machine building production
Authors: Feofanov Alexander , Baranov Nikolay
Published: November 2019

Digital twin is one of instruments of Industry 4.0 in order to effectively manage the enterprise and its activities. However, the digital twin of production application is exposed to various risks. Careful identification of these risks speeds up digital twin creation and implementation process.
Reverse and pull-away engines for the carrier rocket sustainer
Authors: Alies Michael Yu. , Solovatov Irec A. , Mitiukov Nicholas W.
Published: November 2019

The work on the parameters of the engines for pulling away the spent rocket stage to the restricted zone is conducted with the use of the sustainer engine specially calculated for the present investigation. It is shown that a special block of engines having the functions of reverse and pull away can be the most effective solution of the problem. Depending on the aim and launch site and the location of the restricted zone the best variant is the mounting of the units of small special-purpose engines.
Influence of deposition conditions on structure parameters and mechanical properties of multi-element coatings based on niobium nitride
Authors: Tabakov Vladimir , Chikhranov Aleksey , Dolzhenko Yana
Published: November 2019

The paper presents the results of studies of the influence of the deposition conditions, coatings NbTiZrN, NbTiAlN on structure parameters and mechanical properties. It is shown that the changes of these parameters depend on the composition of coatings. It was found that the condensation temperature affects the phase composition of the coating. Data obtained can be used when choosing functional layers of multi-element coatings.
Studies of the structure and properties of materials of the Fe-C-Si system after centrifugation of the melt
Authors: Bikulov Rinat
Published: November 2019

The paper presents the results of a study of the specifics of transformations in materials of the Fe-C-Si system (cast irons) during centrifugation of the melt and subsequent crystallization. The results of the study showed that the thermodynamic potential of compact graphitization can be created artificially, not only through the introduction of modifiers, but also due to the redistribution of impurities as a result of centrifugation.
Thermostabilizing annealing analysis of organomorphic preforms made of oxidized polyacrylonitrile
Authors: Prosuntsov Pavel , Bogachev Evgeniy , Elakov Alexander
Published: November 2019

The simulation results of the thermal stabilization of polyacrylonitrile pressed organomorphic frame samples are presented. The local temperature maximum in the sample depth due to an exothermic oxidation reaction was confirmed. The possibility of the avalanche exothermic effect, which can lead to a sample burnout, is demonstrated theoretically. The analysis of the influence of the initial fiber oxidation degree on the sample temperature state have been carried out.
Theoretical determination of kinematic parameters of a nightshade fruit separator
Authors: Belousov Sergey V. , Оnikienko Sergey Yu. , Arakelyan Nina S. , Belousova Anna I.
Published: November 2019

The work is devoted to the theoretical determination of kinematic parameters of a nightshade fruit separator both in direct and reusable way. The article has a research character, which is expressed in the fact that theoretically the analysis of kinematic parameters of a fruit separator, as well as works of leading scientists on the problem, their shortcomings and ways of solving these problems are indicated. There was determined the main trend of theoretical research. There were also justified the type of the proposed design, its theoretical description and the flow of the technological process. As a result of the work done, the design of the device for reusable harvesting of tomatoes and nightshade vegetables with the proposed working bodies is presented. The conclusions present the main results achieved so far.
Flexural strength of porous ceramic-bonded composites for abrasive tools
Authors: Bagayskov Yu.
Published: November 2019

One of the main parameters to measure a grinding tool performance is the material strength. This is especially true for grinding wheels operating at speeds of 35 to 60 m/sec. The grinding wheel performance can also be impaired by its imbalance due to defects in its geometry and nonuniform distribution of weight over the volume. However, a way to improve the grinding efficiency is to use high-porosity low-hardness grinding wheels with lower strength properties. Research shows that the lower the grinding wheel’s strength – the bigger its structure number, the higher the content of burnable pore forming agents. This isespecially applicable to tools made from silicon carbide rather than fromalundum (electric corundum). The particle size of thepore forming agent has no major effect on the grinding wheel strength. Ceramic bonds with better adhesive capacity should be used together with overall improvement of the grinding tool structure.
Methods for obtaining and processing biocompatible medical materials
Authors: Ivanov Mikhail , Poddubskaya Elena , Uchevatkina Nadezda
Published: November 2019

The article is devoted to the scientific problem associated with the production and processing of biocompatible medical materials with improved mechanical and functional properties. Processing biocompatible materials is one of the key processes to achieve operational properties. The study presents the results of microhardness and microstructure, which showed that electroplastic treatment, together with subsequent annealing, helps to obtain a homogeneous nanocrystalline structure and improve a number of operational properties that play an important role when using biocompatible medical materials.
Сorrection сalculation of the heat source power during plasma-powder surfacing of the necks of stepped shafts
Authors: Latypova G.R. , Karpenko N.N. , Latypov R.A.
Published: November 2019

A mathematical model is proposed for calculating temperature fields during arc surfacing of limited cylinders, eliminating the need for dimensionless parameters, when solving the differential heat equation, which facilitates the practical application of the developed calculation method. It is proposed that the penetration depth be calculated using the Lambert function. The obtained dependences make it possible to quantify the required correction of the heat source power in the process of surfacing the necks of stepped shafts.
X-ray microanalysis of powders, obtained by electroerosion dispersion of the alloy W-Ni-Fe
Authors: Latypov R.A. , Ageeva E.V. , Latypova G.R.
Published: November 2019

The results of X-ray microanalysis of powders, obtained by electroerosive dispersion of the W-Ni-Fe alloy with various electrical parameters of the device, are presented. Conducted researches, aimed at establishing the elemental composition of powders, obtained by electroerosion dispersion of the alloy W-Ni-Fe, will determine the most rational area of their practical application.
Design of simulation models and study on their basis the dynamics of the cyclic mechanisms
Authors: Telegin Viktor , Telegin Igor
Published: November 2019

Reliability and performance of mechanical systems of cyclic action are largely determined by the level of oscillatory processes in their links. Violation accuracy positioning of the output links mechanisms, the destruction of their elements during operation, accelerated wear - all this is the result of the presence of dynamic forces in the mechanism, the speed of the elements of which cyclically changes from a certain minimum to maximum value. Calculations of such mechanisms are based on their dynamic models. A model is a representation of a mechanism in the form of a system of concentrated masses connected by elastic-dissipative, piecewise-continuous (due to the presence of gaps), holonomic bonds. This work is devoted to automation processes for creating such models and calculating on their basis the dynamic characteristics of the mechanism.
Researches of the combined coulter working process for direct strip sowing of seeds
Authors: Khamuev Victor , Pisarev Oleg , Boiko Andrey , Podlesniy Dmitriy
Published: November 2019

In this paper We presented design of analytic dependencies of main geometrics parameters of combine coulter distributer for direct strip sowing of cereals with accounting of pass speed of particle from the distrib-uter.