bluuebunny/crossref_metadata_2025 huggingface dataset:
A divergent synthetic pathway for pyrimidine-embedded medium-sized azacycles through an N-quaternizing strategy
Authors: Choi Yoona , Kim Heejun , Park Seung Bum
Published: October 2018

A new divergent synthetic pathway for skeletally distinct pyrimidine-containing medium-sized azacycles was developed. Diversity-generating reactions via selective bond cleavages or migrations from N-quaternized intermediates were designed, and 14 discrete core skeletons were synthesized in an efficient manner. The skeletal diversity of the resulting molecular frameworks was confirmed by chemoinformatic analysis.
Counterion influence on dynamic spin properties in a V(iv) complex
Authors: Lin Chun-Yi , Ngendahimana Thacien , Eaton Gareth R. , Eaton Sandra S. , Zadrozny Joseph M.
Published: October 2018

Studies of R3NH+salts of [V(C6H4O2)3]2−experimentally define the distance dependence of the impact of the CH3-group on spin properties.
Practical high strain with superior temperature stability in lead-free piezoceramics through domain engineering
Authors: Zhao Chunlin , Wu Bo , Wang Ke , Li Jing-Feng , Xiao Dingquan , Zhu Jianguo , Wu Jiagang
Published: October 2018

New domain engineering by utilizing phase boundary design, chemical modification, and electric-field driving achieves high and stable strain in lead-free piezoceramics.
Tunable fabrication of core–shell Ni–MnO2 hybrid foams through structure-guided combustion waves for binder-free high-performance supercapacitor electrodes
Authors: Hwang Hayoung , Shin Dongjoon , Kim Taewon , Park Seonghyun , Yeo Taehan , Choi Wonjoon
Published: October 2018

Combustion waves passing through hybrids of nickel foams and fuels fabricate tunable core–shell Ni@C (Ni@MnO2) as a template for binder-free high-performance supercapacitor electrodes.
Preferential proton conduction along a three-dimensional dopant network in yttrium-doped barium zirconate: a first-principles study
Authors: Toyoura Kazuaki , Meng Weijie , Han Donglin , Uda Tetsuya
Published: October 2018

The atomic-scale picture of proton conduction in highly doped barium zirconate has theoretically been clarified using first-principles calculations.
Dual stimuli-responsive saccharide core based nanocarrier for efficient Birc5-shRNA delivery
Authors: Chen Huiying , Ma Yu , Lan Haoming , Zhao Yinan , Zhi Defu , Cui Shaohui , Du Jianjun , Zhang Zhen , Zhen Yuhong , Zhang Shubiao
Published: October 2018

Stimuli-responsive delivery systems show great promise in meeting the requirements of several delivery stages to achieve satisfactory gene transfection.
Variable densification of reduced graphene oxide foam into multifunctional high-performance graphene paper
Authors: Xu Fan , Chen Ruofan , Lin Zaishan , Sun Xianxian , Wang Shasha , Yin Weilong , Peng Qingyu , Li Yibin , He Xiaodong
Published: October 2018

Our new strategy is very promising in terms of controlling the thickness, density, and size of graphene paper.
The electronic applications of stable diradicaloids: present and future
Authors: Hu Xiaoguang , Wang Wenxiang , Wang Dongsheng , Zheng Yonghao
Published: October 2018

Diradicaloids are promising materials for organic electronics and nonlinear optics due to their unique optical, electronic and magnetic properties. High performance organic field-effect transistor and photodetector based on diradicaloids have been achieved. Future potential applications in organic batteries, memory, logic gates and non-linear optics are expected.
Positioning optimisation based on particle quality prediction in wireless sensor networks
Authors: Zhang Chunjiong , Xie Tao , Yang Kai , Ma Hui , Xie Yuxia , Xu Yueyao , Luo Pan
Published: October 2018

The particle degradation problem of particle filter (PF) algorithm caused by reduction of particle weights significantly influences the positioning accuracy of target nodes in wireless sensor networks. This study presents a predictor to obtain the particle swarm of high quality by calculating non‐linear variations of ranging between particles and flags and modifying the reference distribution function. To this end, probability variations of distances between particles and star flags are calculated and the maximum inclusive distance using the maximum probability of high‐quality particle swarm is obtained. The quality of particles is valued by the Euclidean distance between the predicted and real observations, and hereafter particles of high quality are contained in spherical coordinate system using the distance as diameter. The simulation results show that the proposed algorithm is robust and the computational complexity is low. The method can effectively improve the positioning accuracy and reduce the positioning error of target nodes.
Entraîner l’attention et la mémoire pour améliorer la lecture labiale
Authors: Mora Mathilde , Bosset-Audoit Amélie
Published: October 2018

Pour les adultes devenus sourds, la lecture labiale est un complément essentiel de l’appareillage auditif pour optimiser leur compréhension, notamment dans les situations de bruit. Des études récentes ont montré l’existence d’un lien entre lecture labiale et fonctions cognitives, notamment la mémoire de travail et l’attention visuelle. Nous avons cherché à exploiter ces nouveaux éléments en évaluant l’efﬁ cacité d’un entraînement de la mémoire de travail et de l’attention visuelle associé à un apprentissage classique de la lecture labiale. Pendant 4 mois, nous avons suivi 4 adultes devenus sourds puis comparé la vitesse de leur progression en lecture labiale durant deux phases : une phase d’apprentissage isolé de la lecture labiale, et une autre phase où cet apprentissage était associé à un entraînement simultané de la mémoire de travail et de l’attention visuelle. Les résultats montrent que ces patients ont fait davantage de progrès en lecture labiale durant la phase où ces fonctions cognitives étaient entraînées.
Extension of Bayesian inference for multi-experimental and coupled problem in neutronics − a revisit of the theoretical approach
Authors: Frosio Thomas , Bonaccorsi Thomas , Blaise Patrick
Published: October 2018

Bayesian methods are known for treating the so-called data re-assimilation. The Bayesian inference applied to core physics allows to get a new adjustment of nuclear data using the results of integral experiments. This theory leading to reassimliation encompasses a broader approach. In previous papers, new methods have been developed to calculate the impact of nuclear and manufacturing data uncertainties on neutronics parameters. Usually, adjustment is performed step by step with one parameter and one experiment by batch. In this document, we rewrite Orlov theory to extend to multiple experimental values and parameters adjustment. We found that the multidimensional system expression looks like can be written as the monodimensional system in a matrix form. In this extension, correlation terms appears between experimental processes (manufacturing and measurements) and we discuss how to fix them. Then formula are applied to the extension to the Boltzmann/Bateman coupled problem, where each term could be evaluated by computing depletion uncertainties, studied in previous papers.
Pentagonal Cone b-metric Spaces over Banach Algebras and Fixed Point Theorem of Generalized Lipschitz Mapping
Authors: Auwalu Abba
Published: October 2018

In this paper, we introduce the concept of pentagonal cone b-metric space over Banach algebras as a generalization of cone metric space over Banach algebras and many of its generalizations. Furthermore, we prove Banach fixed point theorem in such a space. Our result unify, complement and/or generalized some recent results in the papers [1–7], and many others. We provide some examples to elucidate the validity and superiority of our results.
A Fresh Look To Exact Solutions of Some Coupled Equations
Authors: Karaagac Berat , Yagmurlu Nuri Murat , Esen Alaattin , Kutluay Selcuk
Published: October 2018

This manuscript is going to seek travelling wave solutions of some coupled partial differential equations with an expansion method known as Sine- Gordon expansion method. Primarily, we are going to employ a wave transformation to partial differential equation to reduce the equations into ordinary differential equations. Then, the solution form of the handled equations is going to be constructed as polynomial of hyperbolic trig or trig functions. Finally, with the aid of symbolic computation, new exact solutions of the partial differentials equations will have been found.
On Characterization of Open Sets in Euclidean Spaces
Authors: Muradov Firudin Kh.
Published: October 2018

A ternary semigroup is a nonempty set T together with a ternary oper- ation [abc] satisfying the associative law [[abc] de] = [a [bcd] e] = [ab [cde]] for all a, b, c, d, e ε T. A map f between topological spaces X and Y is called open if the image of each set open in X is open in Y. The pur- pose of this paper is to give an abstract characterization of the ternary semigroups of open maps defined on open sets in Euclidean n-spaces.
An Alternative Approach for Nonlinear Optimization Problem with Caputo - Fabrizio Derivative
Authors: Evirgen Fırat , Yavuz Mehmet
Published: October 2018

In this study, a fractional mathematical model with steepest descent direction is proposed to find optimal solutions for a class of nonlinear programming problem. In this sense, Caputo-Fabrizio derivative is adapted to the mathematical model. To demonstrate the solution trajectory of the mathematical model, we use the multistage variational iteration method (MVIM). Numerical simulations and comparisons on some test problems show that the mathematical model generated using Caputo-Fabrizio fractional derivative is both feasible and efficient to find optimal solutions for a certain class of equality constrained optimization problems.
Image Coding Using Laplace Transform
Authors: Gençoǧlu Muharrem Tuncay , Vural Mehmet
Published: October 2018

In this paper a different cryptographic method is introduced by using Power series transform. A new algorithm for cryptography is produced. The extended Laplace transform of the exponential function is used to encode an explicit text. The key is generated by applying the modular arithmetic rules to the coefficients obtained in the transformation. Here, ASCII codes used to hide the mathematically generated keys strengthen the encryption. Text steganography is used to make it difficult to break the password. The made encryption is reinforced by image steganography. To hide the presence of the cipher text, it is embedded in another open text with a stenographic method. Later, this text is buried in an image. For decryption it is seen that the inverse of the Power series transform can be used for decryption easily.

Experimental results are obtained by making a simulation of the proposed method. As a result, it is stated that the proposed method can be used in crypto machines.
A highly accurate corrected scheme in solving the Laplace's equation on a rectangle
Authors: Dosiyev Adıgüzel A. , Sarıkaya Hediye
Published: October 2018

A pointwise error estimation of the form 0(ρh8),h is the mesh size, for the approximate solution of the Dirichlet problem for Laplace's equation on a rectangular domain is obtained as a result of three stage (9-point, 5-point and 5-point) finite difference method; here ρ = ρ(x,y) is the distance from the current grid point (x,y,) ε Πh to the boundary of the rectangle Π.
An Approximate Grid Solution of a Nonlocal Boundary Value Problem with Integral Boundary Condition for Laplace's Equation
Authors: Dosiyev Adıgüzel A. , Reis Rifat
Published: October 2018

A new method for the solution of a nonlocal boundary value problem with integral boundary condition for Laplace's equation on a rectangular domain is proposed and justified. The solution of the given problem is defined as a solution of the Dirichlet problem by constructing the approximate value of the unknown boundary function on the side of the rectangle where the integral boundary condition was given. Further, the five point approximation of the Laplace operator is used on the way of finding the uniform estimation of the error of the solution which is order of 0(h2), where hi s the mesh size. Numerical experiments are given to support the theoretical analysis made.
Exact Solutions with Lie Symmetry Analysis for Nano-Ionic Currents along Microtubules
Authors: Yüzbaşı Zühal Küçükarslan , Aslan Ebru Cavlak , Inc Mustafa
Published: October 2018

In this work, the Lie symmetry analysis is tested by its applications to nano-solitons of ionic waves propagation along microtubules in living cells and nano-ionic currents of MTs.
On New Knot Tables
Authors: Elmali Ceren Sultan , Uğur Tamer , Kunduraci Tuǧçe
Published: October 2018

The quasi-pseudo metrics on the vertices of a digraph induces a unique bitopology. In this work, we obtained that a bitopology is associated with any knotkm, wherekis crossing points of knot andm= 1,2 by using quasi-pseudo metrics on the vertices of a digraph which is called knot digraph by us, when we consider relation between the knot and its graph (knot digraph notation). Also some topological properties of bitopology obtained by using quasipseudo metric and associated with the knot digraphs are investigated.
On Intuitionistic Fuzzy 2-Metric Spaces
Authors: Güner Elif , Çetkin Vildan , Aygün Halis
Published: October 2018

In this study, we first recall the notion of an intuitionistic fuzzy 2-metric space and fundamental definitions with several illustrative examples. Then we define the notion of δ−chainable space and (δ,λ)−uniform locally contractive mapping between intuitionistic fuzzy 2-metric spaces. After that, by using the proposed concepts, we obtain a few fixed point theorems of self-mappings defined on this spaces.
Assesment of the Image Distortion in Using Various Bit Lengths of Steganographic LSB
Authors: Inan Yucel
Published: October 2018

Several methods developed and applied for protecting the information. One of these is the stenography. Steganographic techniques are used to transmit the information in the image to the receiver in a secure manner. There are two main principles in the steganographic process. The first one is to hide the message in the image and the second one is to reduce the distortion on the image caused by information hiding. By making changes on digital images, a lot of information can be placed in the image. Nevertheless, changes in the image should not be noticed. In this paper, the effect of using various bit length of the steganographic LSB method on the image distortion is studied. The PSNR, SNR and MSE were used to assess the distortion rates of the images. Histograms were drawn to visualize the differences between original and encoded, “stego-images”.
Reproducing kernel functions for linear tenth-order boundary value problems
Authors: Akgül Ali , Akgül Esra Karatas , Orcan Baris , Inc Mustafa
Published: October 2018

Higher order differential equations have always been an onerous problem to investigate for the mathematicians and engineers. Different numerical methods were applied to get numerical approximations of such problems. This paper gives some reproducing kernel functions to find approximate solutions of the tenth-order boundary value problems (BVPs). These reproducing kernel functions are very important in the reproducing kernel Hilbert space method.
A Note on a Binary Relation Corresponding to a Bipartite Graph
Authors: Sarı Hatice Kübra , Kopuzlu Abdullah
Published: October 2018

In this paper, we firstly define a binary relation corresponding to the bipartite graph and study its properties. We also establish a relationship between the independent sets of the bipartite graph and the definable sets of binary relations corresponding to the bipartite graph.
Comparison of Different Algorithms in the Radiotherapy Plans of Breast Cancer
Authors: Çelen Yonca Yahşi , Evcin Atilla
Published: October 2018

It is aimed to evaluate portal dosimetry results of planned breast cancer patients with intensity-modulated radiotherapy (YART) of Anisotropic Analytical Algorithm (AAA) and Pencil Beam Convolution (PBC) dose calculation algorithms. The plans of 10 treated patients will receive 6 MV photon energy and a total of 25 fractions of 50 Gray dose using the inverse YART technique, which is reverse planned in the Eclipse (ver.13.6) treatment planning system with Varian Trilogy Linear Accelerator prescribing. For each plan, dose was calculated after optimization using PBC and then AAA algorithms. The quality controls of the plans were made using the Electronic Portal Imaging Device (EPID) by creating individual verification plans for each algorithm. In addition, the maximum and average dose values in the target volume were compared in inverse YART plans calculated using PBC and AAA. When treatment plans generated by AAA and PBC dose calculation algorithms are analyzed using EPID, for the PBC algorithm, the mean values of VArea and VAvg are 98.15 ± 1.07, 0.40 ± 0.048 and 98.72 ± 1.13, 0.37 ± 0.051, respectively, for the AAA algorithm. The PTV Dmax value for the PBC algorithm is 109.3 ± 1.09 and the DAvg value is 101.7 ± 0.51. For the AAA algorithm, the PTV Dmax value is 110.6 ± 1.12 and the DAvg value is 102.9 ± 0.62. When the mean values of portal dosimetry VArea and VAvg evaluated using PBC and AAA algorithms were compared, the differences between the algorithms were not statistically significant (p> 0.05). Differences between the algorithms for PTV Dmax and DAvg values are not statistically significant (p> 0.05).
Evaluation of Car Performances Using Data Envelopment Analysis
Authors: GÜRAL Yunus , BUĞATEKİN Ayşe Turan
Published: October 2018

Data Envelopment Analysis (DEA) is a nonparametric method used to examine the relative efficiencies of Decision Making Units (DMUs) on conditions where there are multiple inputs and multiple outputs. As in all sectors, it is very important for the automotive sector to operate effectively. Therefore, it is also important to measure the efficiency and find the source of the inefficiency. In this study, the performances of the DMU of the automobiles will examine using Data Envelopment Analysis. In this direction, it is aimed to assist consumers in purchasing by calculating the relative efficiencies of automobile models, determining effective and ineffective DMUs according to the wishes of the consumers. Sales price and fuel consumption are determined as input variables; maximum speed, cylinder volume, horsepower, maximum torque, luggage volume, acceleration time from 0 to 100 km are determined as output variables.
Analysis of Repairable k-out-of-n System Model Using Inter-Arrival Failure Times
Authors: GÜRCAN Mehmet , GÜRAL Yunus , GÖKDERE Gökhan
Published: October 2018

Examination of repairable k-out-of-n system which has an important place in systems is an important application area of reliability theory. In general, the reliability analysis of a repairable system is based on the distribution of the lifetimes of the components in the system. In this paper, the reliability analysis of the repairable k-out-of-n system is made through the inter-arrival failure times of the components in the system.
(λ,μ) Statistical Convergence of Order γ for Double Sequences of Functions
Authors: Çınar Muhammed , Şeker Dilan , Et Mikail
Published: October 2018

In this present work, we investigate the concepts of Δr - statistical convergence of order [see formula in PDF] for double sequences of real valued functions. Also some definitions we given for Δr - statistical Cauchy sequence for double sequences of real valued functions and some relations between [see formula in PDF] statistical convergence and strong [see formula in PDF]-summability are given.
On the exact and numerical solutions to a nonlinear model arising in mathematical biology
Authors: Yokus Asif , Sulaiman Tukur Abdulkadir , Baskonus Haci Mehmet , Atmaca Sibel Pasali
Published: October 2018

This study acquires the exact and numerical approximations of a reaction-convection-diffusion equation arising in mathematical bi- ology namely; Murry equation through its analytical solutions obtained by using a mathematical approach; the modified exp(-Ψ(η))-expansion function method. We successfully obtained the kink-type and singular soliton solutions with the hyperbolic function structure to this equa- tion. We performed the numerical simulations (3D and 2D) of the obtained analytical solutions under suitable values of parameters. We obtained the approximate numerical and exact solutions to this equa- tion by utilizing the finite forward difference scheme by taking one of the obtained analytical solutions into consideration. We investigate the stability of the finite forward difference method with the equation through the Fourier-Von Neumann analysis. We present the L2 and L∞ error norms of the approximations. The numerical and exact approx- imations are compared and the comparison is supported by a graphic plot. All the computations and the graphics plots in this study are car- ried out with help of the Matlab and Wolfram Mathematica softwares. Finally, we submit a comprehensive conclusion to this study.
Construction of various soliton solutions via the simplified extended sinh-Gordon equation expansion method
Authors: Sulaiman Tukur Abdulkadir , Bulut Hasan , Baskonus Haci Mehmet
Published: October 2018

In this paper, we present the simplified version of the extended sinh-Gordon equation expansion method. The newly proposed approach is based on the well-known sinh-Gordon equation and a travelling wave transformation. We successfully employed this approach to the (2+1)-dimensional nonlinear Chiral Schrodinger's and various solitary wave solutions to the studied nonlinear model are successfully constructed. The (2+1)-dimensional nonlinear Chiral Schrodinger's equation describes the edge states of the fractional quantum hall effect. The 2D and 3D surfaces of some of the obtained solutions are plotted.
A New Method for (4+1) Dimensional Fokas Equation
Authors: Demiray Seyma Tuluce , Bulut Hasan
Published: October 2018

In this paper, modified exp (-Ω(ξ))-expansion function method (MEFM) has been tackled for procuring exact solutions of (4+1) dimensional Fokas equation. Hyperbolic function solutions and dark soliton solutions of (4+1) dimensional Fokas equation have been found by means of this method. Moreover, by the help of Mathematica 9, some graphical simulations were given to clarify the behavior of these solutions.
Technology of rail replacement at end stresses
Authors: Kosenko Sergey , Akimov Sergey , Surovin Pavel
Published: October 2018

The paper focuses on topical issues relating to the maintenance of buffer spans and temporarily repaired sections of continuous welded rail (CWR) tracks. The paper is aimed at developing and studying the feasibility of a technology for replacing temperature-stressed continuous welded rails. For the purposes of this research, the analytical modeling method is used. A design model for moving the end of the stressed rail to the side is presented. Equations of deflections and bending moments arising when the rail is bent to the rated value were derived. Stresses on the rail bending length were determined and compared with the maximum allowable ones. A resource-saving technology has been developed for replacing temperature-stressed buffer rails of a CWR track using intermediate rail fastening Vossloh W-30.
Durability of operated reinforced concrete superstructures of railroad bridges
Authors: Efimov Stefan , Bokarev Sergey , Pribytkov Sergey
Published: October 2018

The paper describes method to evaluate residual service life of reinforced concrete structures of railroad bridges, enabling to consider the presence of defects, operation history, and climatic factor to calculate probabilities of the structural state at any given moment of time. The model based on semi-Markov process was used to predict the state and calculate reliability indicators of structures and their elements. The data sources for reliability models are results of observations of the structural state, mathematical models of occurrence and development of defects. The example of determining residual service life of reinforced concrete superstructure is given based on the mathematical model of working reinforcement corrosion development.
Innovative aspects in developing bridge monitoring systems
Authors: Yashnov Andrey , Kuzmenkov Pavel
Published: October 2018

The average age of bridges in operation and their accumulated damage are ever increasing, while design solutions of new bridges are increasingly complex. It is difficult to adequately reflect performance characteristics of these structures in design models. In order to prevent accidents during construction and operation, it is necessary to verify experimentally that the actual stress-strain behavior corresponds to design parameters. Special monitoring systems are developed and implemented to improve the operational reliability of structures. This study uses mathematical modeling and instrumental measurements to develop monitoring systems. A systematic approach has been implemented. The paper presents the results produced by modern automated measuring, recording and data processing equipment to provide online diagnostics and long-term status monitoring of bridge structures.
Features of dynamic loading of transport vehicles in intensive operation
Authors: Eliseev Andrey , Eliseev Sergey , Orlenko Alexey
Published: October 2018

The paper proposes a method to construct mathematical models of technical objects exposed to intense vibrational interactions, which is typical for assemblies of transport vehicles. A technique has been developed to construct structural mathematical models in the form of structural diagrams, which are dynamically equivalent to automatic control systems. Analytical tools have been adopted from the theory of automatic control. The paper demonstrates the possibilities of changing dynamic properties of technical objects, design schemes of which are represented by mechanical oscillatory systems. Changes in the dynamic effects arising from the introduction of additional inertial couplings have been estimated. Effects of new dynamic properties have been considered. Analytic relations have been proposed for detailed estimates.
Damping of vertical and horizontal transverse vibrations in the bridge span structures
Authors: Provornaya Darya , Glushkov Sergey , Solovyev Leonid
Published: October 2018

The paper considers the issues of vibration isolation of railway bridge units on high-speed lines and seismic protection using dynamic vibration dampers. The purpose of the research is to justify the efficiency of damping the dynamic vibrations of the bridge supports with seismic insulating support parts. The research methodology involves building mathematical models of the systems under consideration and their numerical analysis. The methods of structural mechanics and dynamics of structures were used for solving the assigned tasks. The basic mathematical dependences of the vibration system with two seismic masses were developed. The rolling stock was represented by concentrated forces moving along the span structure. As a result, a new scheme for dynamic damping of vibration of the bridge supports was proposed according to which the span structure used as the dynamic vibration damper has an additional fastening on a rigid abutment.
Terminalistics as the methodology of integrated assessment of transportation and warehousing systems
Authors: Pokrovskaya Oksana
Published: October 2018

The increasing integrated nature of logistics systems services and their role in global chains increases the relevance of the development of a multifactorial methodology for the evaluation of transport-warehouse systems. The study is aimed at development of the methodology of the multidisciplinary study of the terminal and warehousing infrastructure (the author's name is "terminalistics"). Approaches of logistics, transport geography and operation of transportation nodes were used when developing the concept of the methodology. The theory of decision making and the systems theory was used to develop standardized indicators. Programming was used for automatation of decision making. A system of indicators was proposed for comprehensive assessment of operation of transportation and warehousing systems. The characteristics of the new integrated section of the transportation and logistics science was given. A system of logistic normalization of logistics facilities activities was described. Some graphical dependencies based on the proposed indicators were obtained by calculation in real conditions.
Influence of operating firing field technologies on operational performance parameters
Authors: Kazakov Aleksandr , Suprunovskiy Anton
Published: October 2018

At present, introduction of operating firing field technologies is one of the urgent tasks of the Russian railway transport, as their use can significantly improve operational performance parameters. The factors and conditions of transition to operating firing field control system for operational performance are investigated in this paper. It provides the analysis of the problems that arise during the work of the operating firing field and proposes measures for their elimination. Methods of mathematical and computer modeling using the author’s software product were used. A new approach to multilevel simulation of the work of a transport operating firing field has been developed, which involves the use of the mathematical apparatus of multiphase queuing systems.
Systems analysis of the issue of ensuring reliable operation of vehicles
Authors: Tikhii Ivan , Kashkovsky Viktor
Published: October 2018

The paper describes relevance of the issue of ensuring reliable operation of vehicles for providing the required level of economic efficiency and safety of transportations via transport systems. Systems analysis method is used for solving the scientific problem. The place of vehicles is defined in the general classification of technical systems on the basis of systems analysis. The study proposes to divide the criteria of operational efficiency in accordance with the groups of properties of technical objects and shows their interrelation. As a result of the study, the generalized structure of integrated complexes of on-board equipment (ICOE) of vehicles is formed. Analysis of ICOE properties and their effect on the complex reliability is performed from the standpoint of systems approach is performed. Theoretical substantiation is provided for the necessity and the possibility of implementing the principles of survivability and fault tolerance of ICOE to ensure their effective use. The application of mutual control structures for the organization of on-board computer system diagnostics as a central part of ICOE is substantiated.
Сalibration method for a strain-gauge measurement system based on bidirectional rail loading
Authors: Kolomeets Andrey , Sych Tatyana
Published: October 2018

At present, all railways tend to increase the speed of passenger trains and axle loads in transportation of goods. These processes contribute to the improvement of rolling stocks and railway infrastructures. At the same time, there is a need to maintain a high level of safety in transportation. Therefore, experimental research and feasibility studies of the existing monitoring solutions are of the highest priority. Being experimental in nature, this study is aimed at increasing the reliability of the strain-gauge method in measurement of dynamic forces transferred from the wheel to the rail in real operating conditions. Rail strains were experimentally studied under bidirectional loading using a special-purpose impact device. Results of this research are presented in the paper. An experimental measuring section was created for recording loads. Strain gauges were installed on rails in several cross-sections. Rails were loaded with a special-purpose device, which was designed to adjust a loading force and shift a contact point. The structure of the loading device and its basic features are described in the paper.
Simulation of wheel heating when drum braking
Authors: Mironov Aleksander , Shalupina Pavel , Pavlyukov Aleksander , Dobychin Ivan
Published: October 2018

Application of heating control systems is rational for effective prevention of thermal-mechanical damages of the wheels and brake shoes of rolling stock. These systems enable to perform diagnosis of brake equipment elements and to evaluate the effectiveness of drum braking process in terms of wheel heating. The present study aims to assess wheel heating when drum braking and to define the most informative zones and threshold control values for heating control systems. Heating evaluation is conducted using finite element method under different braking modes. Research results are given as heating patterns in solid-rolled wheel of freight car; the influence of the air distributor mode on the wheel heating is considered, the most informative zones for heating control are identified.
Forecast model for estimating the service life of a diagnosed object based on the Neyman–Pearson method
Authors: Barsukov Sergey , Pakhomov Sergey
Published: October 2018

The paper is aimed at developing a forecast model for estimating the service life of a diagnosed object based on the Neyman–Pearson method. It presents a procedure for selecting necessary and sufficient number of diagnostic indicators using the forecast model. The technique has been tested on the basis of a power transformer with a liquid dielectric. A condition-based operation strategy has been proposed for the transformer. According to this strategy, the iron impurity content in the dielectric liquid (oil) of the transformer should be measured every year of operation. Based on the forecast model, it is possible to calculate the variation of average risk (R) and a threshold value of iron impurity content in the transformer oil (k0) for each year of operation. Using these parameters, a reliable forecast model can be constructed to estimate the remaining service life of the transformer. The obtained relationships make it possible to identify a scientifically grounded stage in the service life of a diagnosed object, at which the number of measurable diagnostic indicators (indicators that are necessary for assessing the real technical condition of equipment) can be minimized.
Use of computer software for technical training at rail car repair shops
Authors: Popkov Artem , Bekher Sergei
Published: October 2018

Currently, there is a clear trend towards updating technical regulations and improving control technologies in the field of maintenance and repair of car assemblies and parts. Therefore, there is a need for software and hardware that will provide updated information to specialists of car repair shops in a timely manner. This study is aimed at creating a computer-based network training system that will increase the effectiveness of training and reliability of results. The paper describes methods for verifying and identifying training results based on an analysis of user's behavioral parameters. As a result of the research, the authors have developed a system that can verify training results with a probability of more than 95%.
Structural Dynamic Analysis of the Chenderoh Dam Sector Gate Section
Authors: Ghazali Mohamad Hazwan Mohd , Zawawi Mohd Hafiz , Hassan Nurul Husna , Radzi Mohd Rashid Mohd , Mazlan Ahmad Zhafran Ahmad , Abas Mohamad Aizat , Zainol Mohd Remy Rozainy Mohd Arif
Published: October 2018

The dynamic characteristics such as natural frequencies, mode shapes and frequency response function (FRF) are the important characteristics to be investigated to access the level of durability of any dam structures. These characteristics are important since it will be the reference information for any operational methods to be used for the dam structures. In this study, one of the real dam (i.e., Chenderoh Dam) that available in Malaysia is taken into consideration, where the dynamic analysis of the sector gate section of the dam structure is investigated. the real scale of the sector gate section is measured on site and modelled into the CAD software with the consideration of real build-in materials. Then, the finite element (FE) model is constructed in ANSYS software with the required boundary condition and meshing sensitivity analysis. From the result of modal analysis, 30 natural frequencies are determined in the range of 0.5904 Hz to 8.471 Hz together with the mode shapes but only the most significant natural frequencies will be shown in this paper. In addition, all three axes of the FRF graphs show an agreement for the highest natural frequency value at 7.95 Hz, where the maximum deflection occurred in x axis direction with 2.03 × 10-7 m.
Modeling and Experiment of Electromagnetic Energy Harvester System by Using Dual Moving Mechanical Systems at Low Frequency Range.
Authors: Rahim M. Z. A. , Hamid M. N. H. , Yusuf Z. N. M. , Soid S. N. M. , Ibrahim M. R.
Published: October 2018

This paper presented a concept of single degree of freedom (SDOF) electromagnetic vibration energy harvester device. This technique enable system to operate at wideband frequency range, low frequency and has multi-resonance frequencies. Each mechanical system operates at difference frequency where each system is attached with electromagnetic transducer components. the device is developed based on the parameter factors of vibration transmissibility from external vibration sources into the device through mathematical modelling. A prototype was tested by using vibration exciter and normal human walking. the fabricated device had showed multi-resonant behavior at 4.26 and 8.34 Hz during test. From experiment results, they have showed capability to operate at wide bandwidth frequency from 1.9 until 18.5 Hz at a periodic excitation of 0.04 g. the highest amount of rms voltage that has been produced about 108 mV with a maximum 78 µW average power across the 150 Ω load resistance. So, it has proven the dual-moving mechanical concept with low damping value in system has increased the operating bandwidth frequency and also increased the amount of output voltage from device.
Experimental Identification On Non Linear Properties of Rubber Mount
Authors: Zainudin Iskandazaqwan Zikrullah , Ean Ooi Lu
Published: October 2018

In actual installation, rubber mount are usually excited by different engine force amplitude and frequency. For better characterization of rubber mount, dynamic properties of metal to rubber mount are tested in this paper by using hysteresis loop method. Stiffness and loss factor of rubber mount are calculated from measured hysteresis loop. Experimental works are carried to identify the non-linearity in the amplitude dependent and frequency dependent properties of rubber mount. the s-shaped of hysteresis loop represent as non-linear behavior of rubber mount. the comparison is done for the dynamic properties of rubber mount under different excitation condition. the non-linear behavior of the rubber mount under excitation forced are reported. the result show stiffness change non-linearly according to different amplitude excitation force under different excitation frequency. the observation is significant especially when the excitations force is higher than 5N for the small metal to the rubber mounts. However this observation is different compared to the condition where excitation frequency getting higher. the non-linearity in the rubber mount is becoming not significant when the excitation frequency is getting higher.
Motion Analysis of A Low Cost Customized A-Scan Non Destructive Testing Unit
Authors: Zukri M.N. M. , Bakar E. A.
Published: October 2018

This study introduced a new design of a low-cost customized A-scan Non Destructive Testing (NDT) unit using microcontroller-based scanning motion. the scanning unit from previous research has limitations in scanning envelope area and ability of detection. It can only detect large defects. To solve the limitations mentioned above, the purpose of this study is to develop a device with lower cost, more appropriate size of scanning envelop area, and ability to detect internal layer defections. the mechanism of this machine is achieved by using 3 NEMA 17 bipolar stepper motors for the movement of every axis. MATLAB is used in this machine for the purposes of signal acquisition, signal analysis and to control the linear motions. Since this machine is small in size (40cm x 27cm x 72cm), it can be used for small scale testing and analysis. As compared with current product, this machine is more portable and affordable. Thus, it is more convenient in the areas of research and education. the contributions of this machine is providing an affordable machine for advancement research field and enhancement quality inspection in manufacturing industries.
Thin Structures With Imposed Metric
Authors: Lewicka Marta , Raoult Annie
Published: October 2018

We consider thin structures with a non necessarily realizable imposed metric, that only depends on the surface variable. We give a unified presentation of the three main limit models. We establish the generalized membrane model and we show, by means of an algebraic proof, that the internal membrane energy vanishes on short maps of the metric restricted to the plane. We recall that a generalized bending model can occur only when this reduced metric admits sufficiently regular isometric immersions. When the entries R12.. of the Riemannian curvature tensor are null, this bending energy can vanish; then the next model is necessarily a generalized von Kármán model whose minimum is zero if and only if the three-dimensional metric is flat.
An Introduction to The Basic Reproduction Number in Mathematical Epidemiology
Authors: Perasso Antoine
Published: October 2018

This article introduces the notion of basic reproduction number R0 in mathematical epi-demiology. After an historic reminder describing the steps leading to the statement of its mathematical deﬁnition, we explain the next-generation matrix method allowing its calculation in the case of epidemic models described by ordinary diﬀerential equations (ODEs). The article then focuses, through four ODEs examples and an infection load structured PDE model, on the usefulness of the R0 to address biological as well mathematical issues.
Mathematical Modeling of Effect Of Microtubule-Targeted Agents On Microtubule Dynamic Instability
Authors: Barlukova Ayuna , Honoré Stéphane , Hubert Florence
Published: October 2018

Microtubule-targeted agents (MTAs), widely used in chemotherapy, are molecules that are able to block cancer cell migration and division. Their effect on microtubule (MT) dynamic instability is measured by their influence on observable parameters of MT dynamics such as growth speed, time-based catastrophe frequency, time-based rescue fre- quency, etc. In this paper, we propose a new mathematical model that is able to reproduce MT dynamics with an appropriate estimation of the main observable parameters. Using the experimental data on paclitaxel effect in presence of EB proteins, we fitted param- eters of the model from several drug concentrations. It enable us to understand which non-observable model parameters are able to reproduce the effect of MTAs and thus to highlight a new potential mechanism of action associated with MTAs effect in presence of EB protein.
WHO-Klassifikation der Hirntumoren 2016: radiologisch relevante Neuerungen
Authors: Johnson Derek , Guerin Julie , Giannini Caterina , Morris Jonathan , Eckel Lawrence , Kaufmann Timothy
Published: October 2018

Radiologists play a key role in brain tumor diagnosis and management and must stay abreast of developments in the field to advance patient care and communicate with other health care providers. In 2016, the World Health Organization (WHO) released an update to its brain tumor classification system that included numerous significant changes. Several previously recognized brain tumor diagnoses, such as oligoastrocytoma, primitive neuroectodermal tumor, and gliomatosis cerebri, were redefined or eliminated altogether. Conversely, multiple new entities were recognized, including diffuse leptomeningeal glioneuronal tumor and multinodular and vacuolating tumor of the cerebrum. The glioma category has been significantly reorganized, with several infiltrating gliomas in children and adults now defined by genetic features for the first time. These changes were driven by increased understanding of important genetic factors that directly impact tumorigenesis and influence patient care. The increased emphasis on genetic factors in brain tumor diagnosis has important implications for radiology, as we now have tools that allow us to evaluate some of these alterations directly, such as the identification of 2-hydroxyglutarate within infiltrating gliomas harboring mutations in the genes for the isocitrate dehydrogenases. For other tumors, such as medulloblastoma, imaging can demonstrate characteristic patterns that correlate with particular disease subtypes. The purpose of this article is to review the changes to the WHO brain tumor classification system that are most pertinent to radiologists.
Tabakentwöhnung als Instrument der ärztlichen Behandlung
Authors: Hering Thomas , Batra Anil , Mühlig Stephan
Published: October 2018

Smoking is the biggest cause of premature mortality. Almost half of smokers meet the criteria for addiction. Treatment fails primarily because of the lack of reimbursement. Doctors could treat tobacco addiction and with it the secondary diseases with high efficacy if the conditions with behavioral therapy and medication were made available to them.
Vertebroplastia percutánea guiada por tomografía para el manejo del dolor en pacientes con fractura del cuerpo vertebral
Authors: Kozima S. , Salazar A. de , Espil G. , Siffredi C. , Ferrari L. , Mora C. , Garralda J. , Pinzón J. H. , Cobeñas R. , Aguilar M. , Larrañaga N. , Salamida A.
Published: October 2018

Objetivo Describir la técnica y resultados en cuanto a la mejoría del dolor y complicaciones al realizar este procedimiento mediante guía por tomografía computada.

Materiales y Métodos Estudio observacional descriptivo de una serie de 108 pacientes a quienes se les realizó vertebroplastia percutánea guiada por tomografía computada realizadas en dos hospitales universitarios, entre mayo 2007 y mayo 2017. Todos los procedimientos se realizaron de forma ambulatoria con anestesia local y se valoró el dolor mediante la escala visual análoga.

Resultados Se realizaron 125 vertebroplastias, en el 87,9% de los pacientes (n = 95) se realizó el procedimiento en un cuerpo vertebral, en el 8,3% (n = 9) y 3,7% (n = 4) de los pacientes se cementaron 2 y 3 vertebras respectivamente. El rango de dolor según la escala visual análoga (EVA) previo al tratamiento varió entre 5 y 10, donde un 94% (n = 102) de los pacientes manifestaban una intensidad 10/10. En el postratamiento el rango de dolor varió entre 0 a 7 donde el 98% de la población reportó un valor menor o igual a 3. Se presentaron 3 complicaciones: tromboembolismo pulmonar por metil-metacrilato, extravasación al plexo de Batson y extravasación al espacio interdiscal, cada una en tres pacientes diferentes.

Conclusión La vertebroplastia percutánea guiada por TC ofrece una indiscutible mejora inmediata del dolor en pacientes con fractura de uno o más cuerpos vertebrales, con una baja tasa de complicaciones.