bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis and preliminary evaluation of the anti-cancer activity on A549 lung cancer cells of a series of unsaturated disulfides
Authors: Olivito Fabrizio , Amodio Nicola , Di Gioia Maria Luisa , Nardi Monica , Oliverio Manuela , Juli Giada , Tassone Pierfrancesco , Procopio Antonio
Published: December 2018

In this work we synthesized and tested a series of unsaturated disulfides. Two compounds showed a promising anticancer activity in vitro on A549 lung cancer cells compared to the natural analogue.
Self-assembly of spheroidal triblock Janus nanoparticle solutions in nanotubes
Authors: Kobayashi Yusei , Inokuchi Takuya , Nishimoto Atushi , Arai Noriyoshi
Published: December 2018

We have performed coarse-grained molecular simulations to investigate the morphologies and phase diagrams of self-assembled spheroidal triblock Janus nanoparticles (JNPs) confined in nanotubes.
Metal binding selectivity of an N-terminally free multihistidine peptide HAVAHHH-NH2
Authors: Balogh Bettina Diána , Bihari Zsolt , Buglyó Péter , Csire Gizella , Kerekes Zsuzsanna , Lukács Márton , Sóvágó Imre , Várnagy Katalin
Published: December 2018

For NH2-HAVAHHH-NH2peptide the coordination to internal histidines is preferred for copper(ii), while it is the opposite for nickel(ii).
Insight into the factors influencing the photocatalytic H2 evolution performance of molybdenum sulfide
Authors: Yin Mingcai , Zhang Wenli , Li Hui , Wu Chaojun , Jia Fangfang , Fan Yaoting , Li Zhongjun
Published: December 2018

The specific surface area and composition are found to be the key factors influencing the photocatalytic performance of MoS2+x.
Selective electrochemical detection of bisphenol A using a molecularly imprinted polymer nanocomposite
Authors: Ali Haydar , Mukhopadhyay Soumita , Jana Nikhil R.
Published: December 2018

A molecularly imprinted nanocomposite with covalently connected polyacrylate, β-cyclodextrin and graphene is synthesized for selective capture and electrochemical detection of bisphenol A.
Cascade cyclization and intramolecular nitrone dipolar cycloaddition and formal synthesis of 19-hydroxyibogamine
Authors: Alkayar Ziad T. I. , Coldham Iain
Published: December 2018

Condensation of hydroxylamine and an aldehyde gave an azabicyclo[2.2.2]octane (isoquinuclidine) that was applied to a formal synthesis of 19-hydroxyibogamine.
Responsive surface adhesion based on host–guest interaction of polymer brushes with cyclodextrins and arylazopyrazoles
Authors: Lamping Sebastian , Stricker Lucas , Ravoo Bart Jan
Published: December 2018

Polymer brushes functionalized with cyclodextrin host and arylazopyrazole guest monomers provide strong surface adhesion that is water resistent but can be deactivated by UV irradiation.
Synthesis of 3D hierarchical porous Ni–Co layered double hydroxide/N-doped reduced graphene oxide composites for supercapacitor electrodes
Authors: Wang Wencong , Zhang Ning , Ye Ziran , Hong Zhanglian , Zhi Mingjia
Published: December 2018

In this work, three-dimensional porous Ni–Co layered double hydroxide nanosheets are vertically decorated on N-doped reduced graphene oxide via a simple one-step microwave-assisted hydrothermal process.
β-Cyclodextrin based pH and thermo-responsive biopolymeric hydrogel as a dual drug carrier
Authors: Roy Arpita , Maity Priti Prasanna , Bose Anirbandeep , Dhara Santanu , Pal Sagar
Published: December 2018

Herein, a novel biocompatible and stimuli-responsive network gel has been developed by grafting and crosslinking poly(N-isopropyl acrylamide) and poly(methacrylic acid) on cyclic oligosaccharide β-cyclodextrin [β-CD-cl-(PNIPAm-co-PMAc)].
N-(2-Fluoro-2,2-dinitroethyl)azoles: a novel assembly of diverse explosophoric building blocks for energetic compound design
Authors: Palysaeva Nadezhda V. , Gladyshkin Aleksei G. , Vatsadze Irina A. , Suponitsky Kyrill Yu. , Dmitriev Dmitry E. , Sheremetev Aleksei B.
Published: December 2018

The first protocol forN-(dinitrofluoroethyl)ation of azoles has been created.
Trichalcogenasumanenes containing various chalcogen atoms: synthesis, structure, properties, and chemical reactivity
Authors: Wang Shitao , Shang Jihai , Yan Chaoxian , Wang Wenbo , Yuan Chengshan , Zhang Hao-Li , Shao Xiangfeng
Published: December 2018

Trichalcogenasumanenes containing two kinds of chalcogen are synthesized. The majority chalcogen governs the optical properties and the heavier chalcogen governs the chemical reactivity.
Nanoridge patterns on polymeric film by a photodegradation copying method for metallic nanowire networks
Authors: Wang Jun , Zhang Shuye , Shi Zhiyuan , Jiu Jinting , Wu Chunhui , Sugahara Tohru , Nagao Shijo , Suganuma Katsuaki , He Peng
Published: December 2018

A simple photocopying method based on selective polymer photodegradation is proposed for fabricating topographical nanopatterns. Nanoridges are structured on a polyethylene terephthalate film due to ultraviolet shielding of silver nanowire networks.
In vitrobiocompatibility analysis of functionalized poly(vinyl chloride)/layered double hydroxide nanocomposites
Authors: Singh Monika , Singh Rajesh Kumar , Singh Santosh Kumar , Mahto Sanjeev Kumar , Misra Nira
Published: December 2018

The aim of this study was to examine the cytotoxicity and biocompatibility of functionalized poly(vinyl chloride) (PVC)/layered double hydroxide (LDH) nanocomposites.
Effective treatment of emulsified oil wastewater by the coagulation–flotation process
Authors: You Zhaoyang , Xu Haiyang , Sun Yongjun , Zhang Shujuan , Zhang Li
Published: December 2018

Ship emulsified oil wastewater was used as the research object in this study.
Regression, kinetics and isotherm models for biosorption of organic pollutants, suspended and dissolved solids by environmentally friendly and economical driedPhragmites australis
Authors: El Shahawy Abeer , Heikal Ghada
Published: December 2018

Low cost adsorbents such asP. australishave received considerable interest owing to their low cost, large amount of functional groups and easy availability.
Phase separation behavior of poly(methyl methacrylate)/poly(styrene-co-maleic anhydride) in the presence of hollow silica nanotubes
Authors: Lv Xiong , Zuo Min , Zhang Haimo , Zhao An , Zhu Weipu , Zheng Qiang
Published: December 2018

The applicability of Arrhenius equation to the phase separation behaviors for filled systems indicates that HSNTs results in the decline of temperature sensitivity for phase separation rate, but hardly changes the viscous diffusion essence of chains.
Dual-generation dendritic mesoporous silica nanoparticles for co-delivery and kinetically sequential drug release
Authors: Liu Yanxin , Huang Baolin , Zhu Jiaoyang , Feng Kailin , Yuan Yuan , Liu Changsheng
Published: December 2018

The designed DAMSN could simultaneously load IBU and BSA, and realize sequential drug release efficiently.
Green and facile production of high-quality graphene from graphite by the combination of hydroxyl radical and electrical exfoliation
Authors: Wang Xin , Zhang Long
Published: December 2018

A novel, simple and efficient method, involving the combination of hydroxyl radicals and electrical exfoliation of graphite for the green production of high-quality graphene from graphite, was developed for the first time.
Detection of nucleic acids via G-quadruplex-controlled l-cysteine oxidation and catalyzed hairpin assembly-assisted signal amplification
Authors: Chen Piaopiao , Hu Pingyue , Huang Ke , Sawyer Erica , Sun Ke , Ying Binwu , Wei Xiawei , Geng Jia
Published: December 2018

A novel homogeneous strategy for detection of DNA via biomimetic synthesis of luminescent QDs coupled with nucleic acid signal amplification.
Quantum curcumin mediated inhibition of gingipains and mixed-biofilm ofPorphyromonas gingivaliscausing chronic periodontitis
Authors: Singh Ashish Kumar , Yadav Shivangi , Sharma Kavanjali , Firdaus Zeba , Aditi Prerana , Neogi Kaushik , Bansal Monika , Gupta Munesh Kumar , Shanker Asheesh , Singh Rakesh Kumar , Prakash Pradyot
Published: December 2018

Periodontitis is a biofilm-associated irreversible inflammation of the periodontal tissues.
Removal of arsenic(v) from aqueous solutions using sulfur-doped Fe3O4 nanoparticles
Authors: Liu Junhui , Kong Long , Huang Xueqiong , Liu Min , Li Liang
Published: December 2018

Magnetic Fe3O4:S NPs presented a much better As(v) adsorption performance than undoped Fe3O4 NPs due to sulfur doping.
ICCD camera technology with constant illumination source and possibilities for application in multiwavelength analytical ultracentrifugation
Authors: Pearson Joseph , Cölfen Helmut
Published: December 2018

A new concept for multiwavelength detection in analytical ultracentrifugation is demonstrated, based on the technology of an Andor iStar intensified CCD camera and constant illumination source.
19F multiple-quantum coherence NMR spectroscopy for probing protein–ligand interactions
Authors: Zawadzka-Kazimierczuk Anna , Somlyay Mate , Kaehlig Hanspeter , Iakobson George , Beier Petr , Konrat Robert
Published: December 2018

An NMR experiment is presented that allows identification of weak binders typically found in early stages of drug discovery programs.
LncRNA CASC2 inhibits autophagy and promotes apoptosis in non-small cell lung cancer cellsviaregulating the miR-214/TRIM16 axis
Authors: Li Qian , Chen Kai , Dong Rong , Lu Hengxiao
Published: December 2018

Dysregulated long noncoding RNAs (lncRNAs) have been frequently observed in various cancers including non-small cell lung cancer (NSCLC) and are closely associated with cancer progression.
Collective stresses drive competition between monolayers of normal and Ras-transformed cells
Authors: Moitrier Sarah , Blanch-Mercader Carles , Garcia Simon , Sliogeryte Kristina , Martin Tobias , Camonis Jacques , Marcq Philippe , Silberzan Pascal , Bonnet Isabelle
Published: December 2018

Ras-transformed HEK cell sheets displace normal HEK cell sheets due to larger collective stresses developed at the interface.
Bridging the spatiotemporal scales of macromolecular transport in crowded biomimetic systems
Authors: Regan Kathryn , Wulstein Devynn , Rasmussen Hannah , McGorty Ryan , Robertson-Anderson Rae M.
Published: December 2018

We combine single-molecule conformational tracking with digital Fourier microscopy to couple crowding-induced conformations and trajectories of single molecules with ensemble-averaged transport properties across an unprecedented spatiotemporal range to elucidate the complex dynamics of large DNA crowded by custom-designed networks of actin and microtubules.
Shape-changing polymers for biomedical applications
Authors: Kirillova Alina , Ionov Leonid
Published: December 2018

Smart polymers that are capable of controlled shape transformations under external stimuli have attracted significant attention in the recent years due to the resemblance of this behavior to the biological intelligence observed in nature. In this review, we focus on the recent progress in the field of shape-morphing polymers, highlighting their most promising applications in the biomedical field.
New multicolored AIE photoluminescent polymers prepared by controlling the pH value
Authors: Hu Chenxi , Ru Yue , Guo Zhaoyan , Liu Zhenjie , Song Jianhui , Song Wenbo , Zhang Xiaohong , Qiao Jinliang
Published: December 2018

New multicolored AIE photoluminescent polymers were prepared through pH induction and could be applied in white light-emitting diodes.
Axial flux switched reluctance machines: a comprehensive review of design and topologies
Authors: Torkaman Hossein , Ghaheri Aghil , Keyhani Ali
Published: December 2018

Axial flux switched reluctance machines (AFSRMs) exhibit unique characteristics that specify their superiority over other topologies in specific applications. A number of researchers have studied the efficient design and constructed structures in different types of AFSRMs. Each of such studies seeks to produce a motor with improved characteristics. Here, a comprehensive study is performed in AFSRMs, including their design considerations, sizing equations and the structural changes. The sensitivity of parameters for efficient operation is investigated. Also, the comparisons among topologies are provided for each of the identified metrics. This study ends with a comparison summary, which shows the performance indices evaluation of different topologies to utilise in various applications.
Improving power smoothing and performance of pitch angle system for above rated speed range in wind power systems
Authors: Gholami Mehrdad , Fathi Seyed Hamid , Milimonfared Jafar , Chen Zhe
Published: December 2018

This study presents a new simple control strategy for direct driven permanent magnet synchronous generator wind turbines, using no wind speed sensor. It is shown that the fluctuation in output power, not only exists at below the rated wind speed, but also appears in above the rated speed region. Therefore, it employs power‐smoothing strategies within a wide range of wind speeds and provides soft performance of the pitch angle system for above the rated speed range. In previous studies, power smoothing is mainly limited to the wind speeds below the rated value, whereas, in this study, all operating speed ranges of the turbine, including wind speeds above the rated value, are considered. Fluctuation in the output power for above the rated speed is analysed and it is shown that there is a significant level of fluctuation in the output power. Therefore, a new strategy is proposed to have more power smoothing as well as having soft performance of pitch angle system for above the rated speed region. The performance of the proposed strategy is evaluated by MATLAB/ Simulink simulation and its validity and effectiveness are verified.
A new design of support for burst-prone rock mass in underground ore mining
Authors: Skrzypkowski Krzysztof
Published: December 2018

The article presents the basic methods of strengthening room and roadway excavations in underground ore mining. In particular, it was pointed out that the mining support is very often exposed to additional dynamic loads resulting from the mining of the deposit by means of explosives (slight) as well as from the load arising from rock mass tremors. In the article a new design of arch yielding support adapted to dynamic loads, which can be used in long-term access excavations was proposed. For this case, an exemplary spring deflection, which is located in the support foot cylinder, based on the principle of work and energy was calculated. In the case of exploitation room excavations, laboratory tensile tests of the long expansion rock bolt support, which were carried out in the rock bolting laboratory at the Department of Underground Mining AGH were presented. Load-displacement characteristics for long expansion rock bolt support with a particular indication of the elastic and plastic range were presented. In the summary, it was concluded that with the increase in the depth of exploitation, safe and efficient mining will be possible only due to the use of a support with appropriate yielding.
Drilling mud with addition of new hydration inhibitor for clay rocks
Authors: Wysocki Sławomir , Gaczoł Magdalena , Wysocka Marta
Published: December 2018

While drilling through clay rocks using water-based mud, number of challenges need to be faced in view of hydration and swelling of this type of rock. Those phenomena consist in the fact, that clay mineral grows in volume due to water contact. In order to limit hydration phenomenon, for clay rocks drilling are used drilling muds with addition of chemical agents called hydration inhibitors. The article describes studies, which resulted in development of new formula of drilling mud with addition of a new short-chained amino polymer developed in Drilling, Oil and Gas Faculty AGH-UST Krakow. For the developed mud, tests of technological parameters were conducted according to API RP 13B-1 as well as specialist examinations: linear swelling of Miocene shale and clay rock disintegration. Studies also consists of syntheses of polyampholyte and short-chained cationic polymer. Based on performed studies, it was found that studied mud is characterized by good and easy to regulate technological parameters as well as effective inhibition of hydration, swelling and disintegration of clay rocks.
Use of close-range photogrammetry and UAV in documentation of architecture monuments
Authors: Wojciechowska Gabriela , Łuczak Jakub
Published: December 2018

The available photogrammetric solutions, combined with properly conducted surveying measurements enable to create fully applicable, three-dimensional models of architectural structures, which can be applied in, i.e. protection of cultural heritage or conservational documentation. Currently, we can see an increase in use of digital non-metric cameras in a photogrammetric inventory of sacred monuments. Properly obtained and analysed data allow to create a digital model of an object, which later might serve as a basis for a vector image used for architectural and construction purposes. The paper presents the procedure of creation of 3D models of sacred historic monuments of relatively small sizes with the use of terrestrial photogrammetry and UAV using the Agisoft PhotoScan Professional software.
Accuracy analysis of satellite measurements of the measurement geodetic control network on the southern Spitsbergen
Authors: Głowacki Tadeusz
Published: December 2018

Geodetic networks are very important in analyses of long-term monitoring deformation of natural objects in polar regions. The ground stability of geodetic reference points can give the quality of the results of geometry measures. Well measures give the purpose to environmental protection of measured natural objects (moraines, talus slopes, debris etc.). The main objective of this paper is to compare the adjustment of the geodetic network by the Least Square Method based on one (ASTRO) or two (ASTRO and NYA1) reference points with full rank and robust adjustment. The main adjustment steps with important numerical results are presented for both methods. The method how to detect the presence of the used wrong approximate coordinates of network points is addressed, and the detection approaches are given for both adjustment procedures. The results of both adjustment procedures summarized in the Conclusion indicate that the combination of these procedures is not suitable way of detecting errors in a geodetic network.
Influence of a trout farm on antioxidant defense in larvae ofEphemera danica(Insecta: Ephemeroptera)
Authors: Božanić Milenka L.J. , Todorović Dajana D. , Živić Miroslav Ž. , Perić-Mataruga Vesna D. , Marković Zoran Z. , Živić Ivana M.
Published: December 2018

The aim of this study was to establish the influence of a trout farm on the activity of enzymes superoxide dismutase (SOD) and glutathione peroxidase (GPx), and total glutathione concentration (GSH), in larvae ofEphemera danica, and on environmental parameters in the receiving watercourse. The investigations were carried out seasonally (April, July, and October of 2016 and January of 2017) at four localities (SK1–control, and SK2, SK3, and SK4–30 m, 330 m and 630 m below the fish farm, respectively) along the Skrapež River. Discharged water had the greatest effect on the concentrations of dissolved oxygen (DO), ammonium ions, nitrates (NO3−), and total phosphorus. In the case of SOD and GSH, seasonal changes were greater than longitudinal, with maximal values attained in spring and summer and minimal in autumn and winter. SOD showed the strongest correlation with DO, and GSH with total nitrogen. Activity of GPx demonstrated greater longitudinal variability with maximum at SK2 in all seasons and the strongest correlation with NO3−. The obtained results indicate that GPx activity was the most sensitive to the trout farm effects, while SOD and GSH were more influenced by natural seasonal changes of environmental parameters.
A Two-Level Non-Intrusive Coupling Method for Fatigue Analysis
Authors: Liu Yanjie , Sun Qin
Published: December 2018

concept and the continuum damage mechanics, a two-level non-intrusive coupling strategy for fatigue analysis procedure is developed to efficiently and accurately predict the fatigue damage of critical details in a large structure. Coupled multi-scale models including the global structure (coarse mesh) and local details (fine mesh) are involved to evaluate fatigue damage in local details and their effect on the global structure. In this method, the fatigue analysis in critical region is divided into two levels – the local boundary condition update and the local fatigue analysis. In the first level, the external cyclic load is transferred from global scale to the local scale. And in the second level, the local fatigue analysis driven by the local cyclic boundary is carried out. The computational procedure of this two-level analysis can be fully coupled, semi-coupled or uncoupled according to different scenarios. Furthermore, the low-cycle fatigue damage is studied and the corresponding fatigue life predictions are simulated on a plate with a central circular hole under cyclic load. The results reveal that the present method greatly improves the numerical efficiency and accords well with the traditional FE analysis with global fine mesh.
Formation of bubble chains over twin nozzles
Authors: Dzienis Paweł , Mosdorf Romuald , Tomaszuk Daniel , Suchecki Wiotold
Published: December 2018

In the paper the formation of bubble chains over two nozzles has been experimentally investigated and modelled. Bubbles were generated from twin brass nozzles (with the inner diameter equal to 1 mm) to distilled water. The appearance and disappearance of alterative bubble departures have been investigated. It has been found that during disappearance of alternative bubble departures bubbles depart from nozzle outlets simultaneously. The PIV method was used to reconstruct the liquid velocity field around the bubble chains. The results of experiment were comparing with results of numerical simulation in which the Level Set method has been used. The PIV method show that during the alternate bubble departures the range of the velocity field formed by the bubble chain is smaller than in case when bubbles depart in non-alternative way. In this case the bubbles velocity above the nozzles outlet is greater in comparison with bubble velocity during the simultaneously bubble departures. The numerical simulations show that in alternative bubble departures bubble just after its departure is attracted to the common bubble chain. The hydrodynamic interactions between departing bubbles lead to uniform distribution of bubbles in bubble chain.
Synthesis and structure of BiFeO3:RE (RE=Gd3+, Dy3+, Nd3+) ceramics
Authors: Dzik J. , Płońska M. , Pikula T. , Rerak M.
Published: December 2018

In the present work the influence of rare earth elements concentration (0-10at-%) on BiFeO3:RE (RE=Gd3+, Dy3+, Nd3+) ceramics were studied. All ceramic powders were synthesized by conventional ceramic method using high purity raw materials (>99,9%), and subsequently sintered by free sintering and cold pressing method. To analyze the powders and ceramics more the XRD, EDS, SEM, and DTA were performed.
Prediction and verification of the single cladding layer thickness for laser solid forming
Authors: Wang Jun-hua , Han Fu-zhu , Ying Wei-sheng
Published: December 2018

In order to accurately measure the powder effective utilization rate and to predict the single cladding layer thickness in laser solid forming process, a new method to measure powder distribution density is presented in this paper. Using this method, the powder material entering molten pool was collected by a copper tube with the same size as laser spot and its mass was measured to accurately calculate powder effective utilization rate in the laser solid forming process. And then, the single cladding layer thickness were calculated according to the conservation law of powder material mass before and after forming, and the correctness of calculating results was verified via a series of single track experiments. The results show that the theoretical calculation results of single cladding layer thickness are well coincident with the experimental results, and it proves that the measurement method of powder distribution density is accurate and reliable. In addition, laser power has a great influence on the geometry size of single cladding layer. Therefore, the influence of laser power on the geometry size of single cladding layer should be taken into account when establishing the prediction model of single cladding layer thickness.
The influence of surface opening cracks on the ultrasonic waves near the surface in concrete members
Authors: Zheng Wan-Yue , Han Qing-bang , Jiang XUE-ping
Published: December 2018

Based on the velocities of waves near the surface in concrete, the propagation path and travel time of different waves were calculated, and the influence of crack on these waves was analyzed. Some theoretical conclusions were verified by FEM. The ultrasonic waves were received by array transducers and the velocities of different waves were calculated and distinguished according to wave velocity in the simulation. Simulation results show that when sound wave propagates through the crack, longitudinal waves will arrive at the receiving arrays, and the crack will diffract transverse wave to generate new longitudinal wave and transverse wave by mode conversion, and Rayleigh wave will propagate along the surface (including the crack side wall). Finally, it is found that the relationship between crack depth and amplitude and energy is approximately linearly monotone decreasing by studying the waves near surface with different crack depths.
Timber “Science” in Herculaneum during the 1st Century A.D.
Authors: Ruggieri Nicola
Published: December 2018

The paper deals with the state of the knowledge on wood material used for constructions during the 1st century in Herculaneum, focusing in particular on the analysis of durability measures and for limiting the effects of timber shrinkage. The study founds on the historical literature and on the finds exceptionally conserved in the archaeological site “thanks” to the Vesuvius’ eruption.
Finite element simulation and microstructure analysis of nickel based alloy for additive manufacturing
Authors: Heping Liu , Fenger Sun , Fenger Yibo , Shaolei Cheng , Bin Liu
Published: December 2018

In this paper, the finite element simulation of GH4169 high temperature alloy by selective laser melting was carried out, and the microstructure was analyzed by experiments. The results show that the shape of the temperature field cloud formed by the laser heat source is different from the shape of the theoretical model, but is in the shape of the ellipse. The temperature gradient at the front end of the molten pool is larger than that of the back end of the molten pool, and the isotherm of the front end of the molten pool is more intensive. The temperature of the substrate is less affected by the temperature gradient. The temperature gradient of the front end of the melting pool is larger than the back end of the molten pool, and the temperature field of selective laser melting is like a meteor with trailing tail. In the laser heat source, the temperature isotherm is the most dense and the temperature gradient is maximum. The relative effect of mechanical properties of δ phase is very complex. When the phase is precipitated by widmanstatten structure, it is easy to produce stress concentration as a source of cracks
Combustion of a frozen bi-dispersed aluminum-water suspension
Authors: Poryazov Vasiliy , Krainov Aleksey
Published: December 2018

This paper presents a combustion model of nano- and microsized aluminum mixture frozen in water. The model takes into account combustion of aluminum particles in water vapor, the motion of combustion products, the temperature and velocity differences between particles and gas. The obtained results of the combustion rate depending on pressure and mass ratio between dispersed Al powders are in good agreement with the experimental data described in scientific literature.
CNTs-modified polyethylene/paraffin composite for electric heaters
Authors: Shchegolkov Alexander , Dyachkova Tatyana , Burakova Elena , Kokuytseva Tatyana , Zobov Alexander
Published: December 2018

The present paper describes paraffin/polyethylene-based composites modified with functionalized carbon nanotubes with the ratio ‘length : diameter” of “10:1…100:1”. These composites possess electrical conductivity and are capable of generating heat under direct current supply conditions. The experiments performed showed that under the action of electric current, the composites are heated up to the stable temperature of 48.3 °C. The effect of maintaining such a temperature is associated with the availability of paraffin in the material composition.
Comparation of nonuniform and uniform Monte - Carlo Searching
Authors: Handrik Marián , Handriková Jana , Vaško Milan , Dorčiak Filip
Published: December 2018

Nonuniform Monte-Carlo method is often used for optimization and solution of function mapping. This method has some disadvantages. New genetic algorithm, based on uniform Monte-Carlo is proposed by authors reduce disadvantage of nonuniform Monte- Carlo method. Both of these methods are based on random number generation and therefore the solutions are approximate. Statistical evaluation of solutions is used for comparison.
Capabilities of processing and visualization of production facilities diagnostic data
Authors: Kandera Matej , Císar Miroslav , Zajačko Ivan
Published: December 2018

One of the main requirements of the safe and sustained workflow of production facilities and machines, is the proper choice and implementation of suitable technical diagnostic method. In the broader sense technical diagnostics includes approaches and methods of technical objects condition determination. This process is based on specific devices parameters inspecting, which values are directly or indirectly caused by certain changes of monitored production facilities condition. In order to reliably detect faults in right time, selected parameters indicating status of the production device should be monitored continuously. At a time when an Internet of Things platforms implemented to the industry business systems is the great temptation from the view of investors and company prestige are these principles common in the process of machine parameters online monitoring and its cross connections within the business realms. This paper describes specific software ThingWorx, which is a great example of sophisticated and universal IoT platform and also describes its application for production facilities diagnostic data collection and visualization.
Innovation of hardness tester mechanism and its functionality test
Authors: Bárnik František , Sága Milan , Štalmach Ondrej
Published: December 2018

The article is focused on constructional design of device mechanism innovation. In the introduction is describe device and his original mechanism. Next section is focused on constructional design of device mechanism innovation and his describe. Another step is comparison between original mechanism and innovated mechanism. In the conclusion are evaluated theoretical and practical benefits of innovation.
Static structural analysis of rolling ball bearing
Authors: Šulka Peter , Sapietová Alžbeta , Dekýš Vladimír , Sapieta Milan
Published: December 2018

In this paper, an effort has been put to analyze the rolling ball bearing using finite element analysis the contact pressure level, stress or displacement behavior of rolling ball bearing. The obtained results were then compared with the analytical results obtained through the methodology of Hertz theory in order to demonstrate an almost identical similarity of results and correct setting up of the given simulation in computational software ANSYS Workbench.
Non homogeneity of surface integrity after hard milling of high tempered bearing steel
Authors: Čilliková Mária , Neslušan Miroslav , Mičietová Anna , Uríček Juraj
Published: December 2018

This paper deals with surface integrity after hard milling of high tempered bearing steel 100Cr6. Surface integrity is expressed in terms of shape deviation as well as Barkhausen noise emission. Furthermore, components of cutting forces are also measured as a function of tool wear and their non homogenity within the contact between the milling cutter and workpiece is discussed. The results of measurements indicate that shape as well as structure remarkable non homogeneity should expected after hard milling due to missing full contact between milling cutter and workpiece. This non homogeneity can be monitored via Barkhausen noise technique. On the other hand the competitive grinding cycles produced more homogenous surface and surface state is a function of infeed speed.
Optimization of machining processes preparation with usage of Strategy Manager
Authors: Dodok Tomáš , Čuboňová Nadežda , Wiecek Dorota
Published: December 2018

At present, the optimization has an important role in machining processes preparation of NC programs. The article deals with the possibilities of automate creation of NC programs by using the NC strategies in CAD/CAM system Edgecam 2017 R2. The main emphasis is placed on the suitability of use, the limitation of the creation and application of the NC strategies. The experiments deal with the comparison of effectiveness of the NC strategies applied to the components with different geometric features. The experimental components are divided into two groups. First group is represented by components with 2D features. Second group is based on components with 3D features. The motivation for this type of research is to increasing efficiency of the machining processes creation by automation tools in CAD/CAM systems.
The effect of chip former on power loading of recessing tool
Authors: Kratochvíl Jiří , Sadílek Marek , Mrazik Jozef
Published: December 2018

The article handles the influence of a chip former on cutting force and its components. This is allowed by using three grooving inserts from ISCAR company, which differ only with the chip former. These inserts have the same base material, coating and they are designed for the same proportion of recessed slot. The conditions of experiment were used in intersection of recommended cutting conditions of the 3 inserts. During the experiment were observed the components of cutting force at changing feed and cutting speed. The results were compiled in tables and graphs were created for each of the used inserts. The particular force loads of the inserts were compared in the end and conclusions thereof were made.
Application of the methodology related to the emission standard to specific railway line in comparison with parallel road transport: a case study
Authors: Rybicka Iwona , Stopka Ondrej , Ľupták Vladimír , Chovancová Mária , Droździel Paweł
Published: December 2018

At present, the impact of transport on the environment constitutes a serious problem. This mainly concerns energy consumption and production of greenhouse gases (GHG) that via their participation in greenhouse effect intensification contribute to global warming. In this paper, the calculations provided by the EN 16258: 2012 methodology will be applied to two modes of transport: railway and road transport. Subsequently, the methodology will be applied to a case study of a selected nonelectrified railway line in comparison with parallel road transport. In particular, energy consumption and production of greenhouse gases will be monitored depending on traveling the distance between selected cities in the Czech Republic.
The peculiarities of monitoring road vehicle performance and environmental impact
Authors: Kuric Ivan , Mateichyk Vasyl , Smieszek Miroslaw , Tsiuman Mykola , Goridko Nataliia , Gritsuk Igor
Published: December 2018

The article describes the peculiarities of mathematical models for determining the performance indicators of operation and environmental impact of road vehicles. The models are the basis of intelligent monitoring systems for separate road transport objects: vehicle propulsion systems, separate vehicles in motion on the real route and traffic flows. The structures of these monitoring systems with the characteristics of input data, the features of simulating the main processes and output results of monitoring the performance indicators of operation and environmental impact of road vehicles are presented. The examples of current parameters monitoring of the car with a gasoline engine in three typical motion phases in the traffic flow are given.
Nonlinear oscillations of a viscoelastic cylindrical panel with concentrated masses
Authors: Khodzhaev D.A Dadakhan , Abdikarimov Rustamkhan , Vatin Nikolay
Published: December 2018

The problems of oscillations of a viscoelastic cylindrical panel with concentrated masses are investigated, based on the Kirchhoff-Love hypothesis in the geometrically nonlinear statement. The effect of the action of concentrated masses is introduced into the equation of motion of the cylindrical panel using the δ function. To solve integro-differential equations of nonlinear problems of the dynamics of viscoelastic systems, a numerical method is suggested. With the Bubnov–Galerkin method, based on a polynomial approximation of the deflection, in combination with the suggested numerical method, the problems of nonlinear oscillation of a viscoelastic cylindrical panel with concentrated masses were solved. Bubnov–Galerkin’s convergence was studied in all problems. The influence of the viscoelastic properties of the material and concentrated masses on the process of oscillations of a cylindrical panel is shown.
Asphalt granulate coating for roadsides
Authors: Sakhapov Rustem , Makhmutov Marat , Nikolaeva Regina , Gatiatullin Muhammat
Published: December 2018

The safety of road trains and other vehicles, the cost of maintenance and repair of roads largely depend on how well designed and calculated the design of the pavement. The research of many scientists and engineers is devoted to the design of pavement.

Quantitative and qualitative changes in traffic flows cannot but affect the actual condition of road pavement and coatings, as well as the requirements for their operational condition. Road clothing is a structure that includes several layers of different materials, the base of which is the ground of the roadbed.

The idea of deformability of the soil mass as a continuous homogeneous half-space has been developed for a long time and now continues to improve. Different technologies for the restoration of structural layers of the road surface were considered. On the basis of this work, it is possible to analyze the study of the state of roadsides and can be given suggestions for improving the calculation of the structures of their strengthening. As a result of the study, the reduction coefficients for the calculated vehicle were calculated with a different combination of longitudinal and transverse slopes of the roadway, a proportional increase in which will allow obtaining the reduction coefficients for all vehicles available in the flow, taking into account the slopes of the roadway.
Increase of fire resistance of reinforced concrete structures with polypropylene microfiber
Authors: Gravit Marina , Golub Elena
Published: December 2018

The increase in the construction of high-rise, technically complex buildings and structures is a prerequisite for the widespread use of structures of heavy concrete. In this work, a special type of destruction of this type of concrete is considered in the fire action explosive spalling. One method of protection is polypropylene microfiber, the objective of which is to increase the fire resistance of concrete and reinforced concrete structures. The fire resistance tests of the reinforced concrete structure with the use of microfiber and without it have been carried out. It is shown that polypropylene microfiber can completely prevent explosive spelling of concrete. In addition, the introduction of additives in the form of fibrous materials into the concrete mix is the most optimal from the point of view of labor intensity and material costs.
Wall and partition products for low-rise buildings on the basis of gypsum with environmentally friendly natural filler
Authors: Safonova Mariya , Syromyatnikova Aitalina , Ammosova Nurguyana , Filippova Kira
Published: December 2018

The possibility of using horsehair in gypsum-based wall and partition products as a reinforcing additive has been investigated. It was established that the magnitude of the pressing pressure has a significant effect on the strength of the material.
Analysis of the velocity diagrams of impellers of centrifugal compressor stages after the preliminary design
Authors: Drozdov Aleksandr , Rekstin Alexey
Published: December 2018

Preliminary design is an important stape in the development of centrifugal compressors and compressor stages. Basically for this purpose, various recommendations on the choice of the flow path dimensions are applied. Researchers of the Research and Development Laboratory “Gas dynamics of turbomachines” prof. Yu.B. Galerkin and A.F. Rekstin analyzed and summarized the dimensions of flow paths of 124 impellers. On the basis of this analysis, formulas were proposed for choosing the flow path dimensions of the centrifugal compressor stages, which were included in the preliminary design program. The formulas used are designed for relative Mach number of 0.7 and isentropic coefficient of 1.4. The correct application of these formulas for other Mach numbers and isentropic coefficient required development of an appropriate approach and algorithm for adjusting the height of the impeller blades at the outlet. Calculations of gas-dynamic characteristics using the Universal Modeling Method showed the need for selecting a coefficient that takes into account the influence of viscosity to obtain the required pressure characteristics of the compressor stage. This problem was also solved in the program of preliminary design. To check the quality of preliminary design, the results were verified using a non-viscous quasi-three-dimensional calculation program. Three stages were designed for parameters different to those used for development of preliminary design formulas. Analysis of the velocity diagrams of the impeller blades and distribution of meridional velocities showed good results of the preliminary design.
Investigation of the influence of the number of vanes on the performance of a rotary vane compressor
Authors: Kotlov Andrey , Kuznetsov Leonid , Hrustalev Boris
Published: December 2018

We developed a mathematical model for determining the parameters of mass transfer in the compressor chambers during the processes of compression and discharge. The mass flow rates through the end and radial gaps were determined. Also we analyzed the processes of mass transfer in a clamped volume. We investigated the influence of the number of vanes on the compressor efficiency, taking into account changes in the compressor geometric parameters. We established that overflows through the end surfaces of rotor mainly affect the compressor performance. In order to reduce overflows during the period of discharge, it was proposed to increase the angle of closure of the discharge window at a fixed angle of its opening. The mathematical model allows one to make recommendations on the choice of the optimal number of vanes for a particular design.
Preparation of syngas from the semi-coke of Borodino coal for solid oxide fuel cells
Authors: Dudinin Aleksey , Tuponogovov Vladimir , Karasev Igor , Bagutdinova Anastasia
Published: December 2018

Syngas for the battery of solid oxide fuel cells is produced in a gas generator with a fluidized layer consisting of a mixture of electrocorundum and semi-coke of the Borodino coal at the temperature of 850 °C, fluidizable by steam in a retort heated from the outside. The concentration of semi-coke is 627 kg per 1m3 of mixture of electrocorundum and semi-coke. The heat of combustion of the obtained syngas is 13359 kJ/kg. Syngas is purified in a cyclone – dust collector and gas purification from SO2 and H2O.
The state of modern heat power engineering and increasing the economic efficiency of heat supply
Authors: Kharlamova Tatiana , Osipova Ksenia
Published: December 2018

The article analyzes the current state of the Russian heat power engineering and identifies the main problems in its economic development. From the position of an integrated approach, the problems of the Russian heat supply system are divided into three categories: technological, economic and social. The using electricity for the needs of heat supply is determined as an effective way of solution these problems. In this context the electric heat supply is offered as an alternative to the modern heat supply system. The article identifies the main factors of electric heating, showing its economic advantages over other types of heat supply systems. On this basis the authors justify the prospects of electric heating system from the point of view of economic development of the Fuel Energy Complex and the national economy as a whole.
Assessment of rainwater harvesting for domestic water supply in palestinian rural areas
Authors: Mahmoud Nidal , Hogland William , Sokolov Michael , Rud Vasily , Myazin Nikita
Published: December 2018

Rainwater harvesting in Palestine is a principal water resource that had been adopted since ancient times. However, the system had not been subjected to a thorough assessment. This paper aims at assessing the feasibility of rainwater harvesting for domestic water supply in Palestinian rural areas with special emphasis on socio-cultural and financial aspects as well as harvested water quality. Different methods were used to collect necessary data from a case study village, including literature review, observations, questionnaires and water quality measurement of freshly fallen and harvested rainwater samples. Moreover, domestic water demand and water supply from such a system were compared, and economic feasibility of applying this system was checked. The results revealed that harvested rainwater is a viable resource that can contribute considerably to minimizing water shortage.
Economical aspects of water-mist assisted air-cooled chillers usage in the temperate climate
Authors: Brahmanis Arturs , Borodinecs Anatolijs , Tihana Jelena , Zemitis Jurgis , Monastyreva Daria
Published: December 2018

The prices for energy resources, global trends for greenhouse gases emission limitation makes the application of higher efficient chillers with process air evaporative cooling more common. In order to determine the economical feasibility for choosing the particular type of cooling unit for the specific building, many factors should be taken into account, which are not always available. One of these factors is the European seasonal energy efficiency ratio (ESEER) defined by the Eurovent Certification Company. It overtakes the outdoor air temperatures from +20° to +35°C with different cooling loads, which is not completely suitable for the Baltic States. Within the research monitoring of cooling system and air parameters was performed during the cooling season. It was indicated that the distribution of the energy generated by the investigated object differs significantly from the distribution of influence factors according to ESEER test methodology. The calculation of the annual energy consumption for the particular historic building according to the recorded power distribution within the outdoor air temperature ranges was performed. Using the proposed method the results are much closer to the actual annual energy consumption of the cooling plant than the one performed using the seasonal efficiency with the base temperature of 18°C.