bluuebunny/crossref_metadata_2025 huggingface dataset:
Relationship between HLA-DRB1 Allele Polymorphisms and Familial Aggregations of Hepatocellular Carcinoma
Authors: Ma S. , Wu J. , Wu J. , Wei Y. , Zhang L. , Ning Q. , Hu D.
Published: February 2016

Objective: We explored the relationship between HLA-DRB1 allele polymorphisms and familial aggregation of hepatocellular carcinoma (fHCC). Methods: Polymerase chain reaction sequence-specific primers were used to determine HLA-DRB1 genotypes for 130 members of families with 2 or more liver cancer patients and for 130 members of families without any diagnosed cancers. The genotype profiles were then compared to explore the relationship between HLA-DRB1 gene polymorphism and fHCC. Result: Of 11 selected alleles, the frequencies of DRB1*11 and DRB1*12 were significantly lower in the fHCC group than in no-cancer group (p < 0.05; odds ratio: 0.286; 95% confidence interval: 0.091 to 0.901; and odds ratio: 0.493; 95% confidence interval: 0.292 to 0.893). Differences in the frequencies of the other 9 alleles were not statistically significant in the two groups (p > 0.05). Conclusions: Our research suggests that if genetic factors play a role in fHCC, the deficiency in the DRB1*11 and DRB1*12 alleles might be the risk factor at work in Guangxi Zhuang Autonomous Region, P.R.C.
Management of Uveal Melanoma: A Consensus-Based Provincial Clinical Practice Guideline
Authors: Weis E. , Salopek T.G. , McKinnon J.G. , Larocque M.P. , Temple-Oberle C. , Cheng T. , McWhae J. , Sloboda R. , Shea-Budgell M.
Published: February 2016

Introduction: Survival in uveal melanoma has remained unchanged since the early 1970s. Because outcomes are highly related to the size of the tumour, timely and accurate diagnosis can increase the chance for cure. Methods: A consensus-based guideline was developed to inform practitioners. PubMed was searched for publications related to this topic. Reference lists of key publications were hand-searched. The National Guidelines Clearinghouse and individual guideline organizations were searched for relevant guidelines. Consensus discussions by a group of content experts from medical, radiation, and surgical oncology were used to formulate the recommendations. Results: Eighty-four publications, including five existing guidelines, formed the evidence base. Summary: Key recommendations highlight that, for uveal melanoma and its indeterminate melanocytic lesions in the uveal tract, management is complex and requires experienced specialists with training in ophthalmologic oncology. Staging examinations include serum and radiologic investigations. Large lesions are still most often treated with enucleation, and yet radiotherapy is the most common treatment for tumours that qualify. Adjuvant therapy has yet to demonstrate efficacy in reducing the risk of metastasis, and no systemic therapy clearly improves outcomes in metastatic disease. Where available, enrolment in clinical trials is encouraged for patients with metastatic disease. Highly selected patients might benefit from surgical resection of liver metastases.
A Simple Approach for Eliminating Spam
Authors: Mazzarello Sasha , Fralick Michael , Clemons Mark
Published: February 2016

In recent years, the incredible expansion of e-mail has changed the way we all practice medicine [...]
Patterns of Care and Treatment Trends for Canadian Men with Localized Low-Risk Prostate Cancer: An Analysis of Provincial Cancer Registry Data
Authors: Tran K. , Rahal R. , Fung S. , Louzado C. , Porter G. , Xu J. , Bryant H.
Published: February 2016

Background: Many prostate cancers (pcas) are indolent and, if left untreated, are unlikely to cause death or morbidity in a man’s lifetime. As a result of testing for prostate-specific antigen, more such cases are being identified, leading to concerns about “overdiagnosis” and consequent overtreatment of pca. To mitigate the risks associated with overtreatment (that is, invasive therapies that might cause harm to the patient without tangible benefit), approaches such as active surveillance are now preferred for many men with low-risk localized pca (specifically, T1/2a, prostate-specific antigen ≤ 10 ng/mL, and Gleason score ≤ 6). Here, we report on patterns of care and treatment trends for men with localized low-risk pca. Results: The provinces varied substantially with respect to the types of primary treatment received by men with localized low-risk pca. From 2010 to 2013, many men had no record of surgical or radiation treatment within 1 year of diagnosis—a proxy for active surveillance; the proportion ranged from 53.3% in Nova Scotia to 80.8% in New Brunswick. Among men who did receive primary treatment, the use of radical prostatectomy ranged from 12.0% in New Brunswick to 35.9% in Nova Scotia. The use of radiation therapy (external-beam radiation therapy or brachytherapy) ranged from 4.1% in Newfoundland and Labrador to 17.6% in Alberta. Treatment trends over time suggest an increase in the use of active surveillance. The proportion of men with low-risk pca and no record of surgical or radiation treatment rose to 69.9% in 2013 from 46.1% in 2010 for all provinces combined. Conclusions: The provinces varied substantially with respect to patterns of care for localized low-risk pca. Treatment trends over time suggest an increasing use of active surveillance. Those findings can further the discussion about the complex care associated with pca and identify opportunities for improvement in clinical practice.
The Second Current Oncology Scholar’s Conference
Authors: Cai Y.
Published: February 2016

Following up on its first workshop—the Current Oncology Scholar’s Forum and Workshop—on 12 May 2012 in China, Current Oncology initiated a 2nd conference in 2015, to communicate with Chinese and other Asian physicians and researchers, with the aim of exploring their current needs and interests and receiving updates on their new achievements in oncology diagnosis, treatment, prevention, recovery, and other areas of interest that intersect with oncology research [...]
Unilateral Morning Glory Disc Anomaly With Ipsilateral Limbal Dermoids
Authors: Lowry Eugene A. , de Alba Campomanes Alejandra G.
Published: February 2016

The authors present the case of a child with multiple limbal dermoids and morning glory disc anomaly in the right eye. These anomalies are rarely associated and this is the first report of co-occurrence in the same eye in a patient without additional systemic anomalies.
[J Pediatr Ophthalmol Strabismus 2014;51:e37–e39.]
Toxic Effects of Engineered Nanoparticles on Living Cells
Authors: Bouloudenine Manel , Bououdina Mohamed
Published: February 2016

Measuring toxic effects of engineered nanoparticles on living cells would require a deep understanding of themselves by the mean of their composition, physical and chemical properties and exposure concentrations. Actually, high exposure concentrations are needed to generate quantifiable effects and to perceive accumulation above background. This chapter presents an overview on the assessment about the toxic effects of engineered nanoparticles on living cells. It consists of three main sections starting with a brief introduction, the current state of engineered nanoparticles in the environment, physical and chemical properties of some important engineered nanoparticles such as “Ag, Au, ZnO, TiO2” and the target organ toxicity of the engineered nanoparticles in several biological organisms.
A Bio-Inspired Phenomena in Cementitious Materials
Authors: Üzüm Onur , Çakır Özge Andiç
Published: February 2016

In this chapter, a deep analyse of a bio-inspired phenomenon starting with broad definitions of included mechanisms is provided. Since establishing an understanding starts with drawing the boundaries of a concept, foremost the definition of related terms are discussed in detail. Afterwards, the importance and history of self-healing phenomenon including the relevant concepts are presented. In order to facilitate the classification, the relevant sub-chapters present two main classes namely autogenic and autonomic healing. Nevertheless, the concepts and mechanisms under these two main topics are also discussed in detail. Finally, evaluation of self-healing mechanisms, tests conducted to determine whether self-healing took place, the indicators of measurement methods, using materials and test methods are given in full detail.
Bioinspired Materials and Biocompatibility
Authors: Anil Muge , Ayyildiz-Tamis Duygu , Tasdemir Seyma , Sendemir-Urkmez Aylin , Gulce-Iz Sultan
Published: February 2016

Material science and engineering are the sources of divergent emerging technologies, since all the modifications and developments are being made to reach a novel biomaterial to fulfill the requirements of biomedical applications, the first important feature is the biocompatibility of the new advanced material. In this chapter, the general biocompatibility concept, test systems to determine biocompatibility, examples of bioinspired materials and their altered biocompatibility and future expectations from these novel bioinspired materials will be discussed.
Synthetic Approaches to Biology
Authors: Penchovsky Robert , Traykovska Martina
Published: February 2016

Nanobiotechnology and synthetic biology are emerging as novel fields that integrate research from science and technology to create novel organisms with new desired properties. We present here the new revolutionary methods of synthetic biology that enable us to engineer gene control circuits, edit genomes, and create de novo whole genomes. The creation of new genomes that function in the cell means that we can create new organisms that are different from those observed in nature. The synthetic genomes can contain novel combinations of genes that offer the opportunities to create novel biological species that possess predefined combination of properties. Therefore, the synthetic genomes can be regarded as a new kind of materials. The methods for whole genome assemble applied so far combined several in vitro and in vivo steps that possess certain technical limitations and shortcomings. In this chapter, we discuss all technical aspects of assembling novel genomes and their current limitations. The genome editing technologies that have been developed over the last several years based on the CRISPR-Cas system is also discussed. In addition, we present major RNA-based methods for design of gene control circuits both in prokaryotes and eukaryotes, including humans.
Seams and Sutures in IT Artifacts
Authors: Cabitza Federico , Simone Carla , Storni Cristiano
Published: February 2016

After more than forty years the principles of the socio-technical approach still offer a sound basis on which Information Systems, interpreted as socio-technical systems, can be constructed to address the increasing need of flexibility of the modern organizations, and to satisfy the will to exploit the technological evolution that now offers unprecedented opportunities for adaptability and flexibility. The paper reconsiders some of the basic principles of socio-technical theory, namely openness, underspecification and interdependence, and on their basis it outlines new ways to conceive IT-supported organizations so that these organizations, their IS artifacts and the constituting IT artifacts can more easily co-evolve without mutually imposing unnecessary constraints. To this aim, we advocate the application of a socio-technical approach to both the design of the social structures and the design of the technical components of the organizations, by leveraging recent frameworks and technological platforms that are aimed at empowering the frontline end-users.
Excellence in Practice through a Socio-Technical, Open Systems Approach to Process Analysis and Design
Authors: Bednar Peter M. , Welch Christine , Milner Christopher
Published: February 2016

Nowadays, organizations pursue their aims in a context of distributed collaboration, creating a need not only for supporting work systems, but for a human-centred focus in which individual and group sense-making and learning are supported by appropriate toolsets. The authors argue that development of such toolsets requires an open systems approach. This paper discusses examples of such approaches, including non-competitive benchmarking (NCB), as a vehicle for knowledge transfer, leading to process improvement and potential for enhanced organizational performance. The paper goes on to discuss tools and techniques that may be used to support desire to reflect upon ‘best practice' in socio-technical design, without losing contextual relevance in design. The authors use these examples to explore ways in which engaged actors may be supported to create and share their contextually-dependent tacit knowledge. The foundation of open systems approaches is discussed, showing how socio-technical approaches continue to have relevance today.
Development of Mechanical Properties of Cement Based Composites with Recycled Concrete Aggregate
Authors: Hrůza Jaromír , Topič Jaroslav , Hlubocký Lukáš , Plachý Tomáš
Published: February 2016

This article deals with the usage of recycled concrete, which arises from demolitions of concrete structures. The aim is to find out what amount of recycled concrete as a binder influences final mechanical properties of the concrete. It was found that the gradual replacement of cement with recycled concrete causes reduction of the dynamic Young’s modulus and decreases the size of the increase in strength during the first 28 days. Overall, it is confirmed that recycled concrete may be used for concrete structures with regard to their purpose, importance and applicability.
Lateral Vibration Induced by Crossing Pedestrian
Authors: Sana Vladimír
Published: February 2016

This paper is dealing with the lateral vibration of simply supported beam induced by one crossing pedestrian. Effects of pedestrian on the structural vibration was simplified by deterministic, stationary, periodic forces, which were placed at the most efficient spot on the structure. A new approach to modeling of excitation of lateral vibration was also introduced. This model is based on the "real" trajectory of pedestrian's centroid and it also reflects fact, that the pedestrian is changing his position in time. Numerical solution of this problem was done by Newmark integration method with using modal decomposition technique.
Non-Destructive Testing of Concrete with Fine Recycled Aggregate
Authors: Šefflová Magdaléna , Pavlů Tereza
Published: February 2016

This paper is focused on non-destructive testing of concrete containing fine recycled aggregate (FRA). FRA was obtained from demolished concrete structures and crushed in the laboratory on fraction 0 – 4 mm. There were prepared four concrete mixtures. The first concrete mixture was control, did not include FRA. In other mixtures was natural replaced natural sand by FRA. There were tested workability of fresh concrete mixture and physical properties of hardened concrete. Finally, it is possible to say that the use of FRA influences the physical properties of concrete. The physical properties of concrete are connected with the durability of concrete. Therefore, it is necessary to focus on durability testing of FRA concrete in further research.
Influence of Oxygen Plasma Surface Treatment of PET Micro Fibers on Flexural Strength of Reinforced Cement Pastes
Authors: Trejbal Jan , Bartoš Jan , Kopecký Lubomír , Ryparová Pavla , Potocký Štěpán
Published: February 2016

Presented work deals with PET (polyethylene terephthalate) fiber-reinforced cement pastes and cool oxygen plasma fiber surface treatment used to attain the better adhesion between fibers surface and the cement matrix. Three sets of cement paste samples were made with the same matrix (CEM I 42.5R with water to cement ratio equal to 0.4). The two sample sets contained micro fiber reinforcement varying in surface properties. One set was reinforced with unmodified fibers, while in to the other set plasma treated fibers were used. As a comparative indicator to bending response of the composite materials, four-point destructive tests were carried out. The samples reinforced with unmodified fibers exhibited deflection-softening behavior during the post-cracking phase, while samples with plasma treated fibers exhibited deflection-hardening behavior.
Different Approaches to Parallelization of Sparse Matrix Assembly Operation
Authors: Bošanský Michal , Patzák Bořek
Published: February 2016

The aim of this paper is to evaluate efficiency of different approaches to parallelization ofstiffness matrix assembly operations, that can be found in any finite element software. OpenMP [1, 2]and POSIX Threads (Pthreads) programming models are two considered in this paper. The OpenMPmodel consist of an Application Program Interface (API) for multi-platform shared-memory parallelprogramming in C/C++. POSIX is an acronym for Portable Operating System Interface and Pthreadsstandards [3] defined as a set of C/C++ language [4] programming types and procedure calls forshared-memory parallel programming. The paper shows that parallelization can efficiently exploit thepower of modern available hardware, significantly reducing the needed computation time. Differentapproaches of each programming model are used for parallelization of stiffness matrix assemblycompared and their efficiency is evaluated in this paper.The different parallelization strategies were implemented in OOFEM [5] which is a free finiteelement code with object oriented architecture for solving mechanical, transport and fluid mechanicsproblems that operates on various platforms. The finite element method leads to set of algebraic equa-tions which components are assembled from contributions of individual elements. In this paper wefocus on assembly of sparse matrix contributions, such as stiffness as mass matrices. Domain decom-position paradigm, where the whole domain is decomposed into sub domain, which contributions areevaluated and assembled by individual threads is hard.The paper discuss the differences between approaches based on OpenMP and Pthreads, datascoping specification for correct parallel programming and memory allocation synchronization andscheduling.
Boundary Value and Optimal Control Problems for Nonlinear Convection-Diffusion-Reaction Equation
Authors: Brizitskii R.V. , Saritskaya Zh.Y.
Published: February 2016

In this paper we consider the boundary value problem and optimal control problem for nonlinear convection-diffusion-reaction equation, in which reaction coefficient depends on concentration of polluting substance. Sufficiently common type of nonlinear dependence is investigated, within which solvability of boundary value and optimal control problem is proved, and local uniqueness of weak solution is obtained.
Optimality Conditions for Pareto-Optimal Solutions
Authors: Gorbunov Vladimir , Sinyukova Elena
Published: February 2016

In this paper the authors describe necessary conditions of optimality for continuous multicriteria optimization problems. It is proved that the existence of effective solutions requires that the gradients of individual criteria were linearly dependent. The set of solutions is given by system of equations. It is shown that for finding necessary and sufficient conditions for multicriteria optimization problems, it is necessary to switch to the single-criterion optimization problem with the objective function, which is the convolution of individual criteria. These results are consistent with non-linear optimization problems with equality constraints. An example can be the study of optimal solutions obtained by the method of the main criterion for Pareto optimality.
Simulation of Conditions of Solid Fossil Fuels Formation for Underground Conversion Investigation
Authors: Martemyanov Sergey M. , Bukharkin Andrey A. , Koryashov Ilia A. , Kvashnina Olga S.
Published: February 2016

In the nearest future, pyrolytic conversion of solid fossil fuels may become an important source of energy resources. Due to this fact, the technologies of heating of subterranean formations are created. This article describes the experience of creating the laboratory setup for the investigations of methods and modes for fuels heating in the conditions similar to the underground ones. Applied technical solutions and the results of their application are described.
Boundary Element Formulation for Numerical Surface Wave Modelling in Poroviscoelastisity
Authors: Igumnov Leonid , Litvinchuk S.Yu. , Belov A.A. , Ipatov A.A.
Published: February 2016

Problems of the poroviscodynamics are considered. Theory of poroviscoelasticity is based on Biot’s equations of fluid saturated porous media under assumption that the skeleton is viscoelastic. Viscoelastic effects of solid skeleton are modeled by mean of elastic-viscoelastic correspondence principle, using such viscoelastic models as a standard linear solid model and model with weakly singular kernel. The fluid is taken as original in Biot’s formulation without viscoelastic effects. Boundary integral equations method is applied to solve three-dimensional boundary-value problems. Boundary-element method with mixed discretization and matched approximation of boundary functions is used. Solution is obtained in Laplace domain, and then Durbin’s algorithm of numerical inversion of Laplace transform is applied to perform solution in time domain. An influence of viscoelastic parameters on dynamic responses is studied. Numerical example of the surface waves modelling is considered.
Features of Difference Scheme for the Diffusion-Kinetic Problem of Ion Implantation with Intermetallic Phases Formation
Authors: Asfandyar Khan , Knyazeva Anna G.
Published: February 2016

The implicit difference scheme has been suggested for the solution of diffusion-kinetic problem describing the ion implantation by intermetallic phase formation. The model corresponds to irreversible conditions and includes finite relaxation times for mass fluxes. The linear difference equations are solved by double-sweep method. The result illustrates the convergence of difference scheme at variation of its parameters. Qualitative picture of phase evolution in the surface layer is obtained different for problem with finite relaxation times and for zero relaxation times.
Solving Unsteady Boundary Value Problems Using Discrete-Analytic Method for Non-Iterative Simulation of Temperature Processes in Time
Authors: Sidorov Vladimir N. , Matskevich Sergei M.
Published: February 2016

Method for solving a boundary value problem of inhomogeneous unsteady-state heat conduction transfer is considered. This physical process can be described by a boundary value problem for a partial differential equation of the 2nd order. Discrete-analytical method, which turns out the mathematical formulation of the initial problem to be normal system of differential equations, was used. There is the non-iterative solution of such system, which is the set of analytic functions. The theory of matrix functions, particularly the properties of matrix exponential, was applied to get the solution. This approach allows us to model the unsteady-state heat conduction processes with unstationary boundary conditions of different types, defined as time-dependent functions. Such modeling describes the real physical processes in structural materials more accurately.
Correct Numerical Methods of Analysis of Structural Strength and Stability of High-Rise Panel Buildings - Part 1: Theoretical Foundations of Modelling
Authors: Belostosky Alexandr M. , Penkovoy Sergey B. , Scherbina Sergey V. , Akimov Pavel A. , Kaytukov Taymuraz B.
Published: February 2016

The distinctive paper is devoted to development and verification of correct numerical methods for analysis of structural strength and stability of high-rise panel buildings. Particularly the first part of the paper contains brief introduction, description of methods of analysis and simulation software. Information about verification of corresponding computational models is presented as well.
Spectral Analysis of Narrow Band Periodic Signals
Authors: Avramchuk Valeriy Stepanovich , Yakovleva E.M.
Published: February 2016

The possibility of using lattice periodic functions in the processing of narrowband signals with methods of discrete Fourier transform, instantaneous spectral density, and synchronous detection providing reduction of the number of readouts being processed, is shown. Results of the method’s experimental evaluation are considered. Suggested method can be used for increasing efficiency of correlation analysis of narrow band signals and for precise measuring of mains electricity supply frequency.
On Modelling of Creep and Plasticity in a Problem of Viscosimetric Flow of a Material
Authors: Begun Alexandra S. , Kovtanyuk Larisa V. , Lemza Alexandr O.
Published: February 2016

This paper considers a deformation process of an incompressible elastoviscoplastic material placed between two coaxial rigid cylinders. The material is deformed when the internal cylinder rotates around its axis while the external one is fixed. The adhesion conditions are set on both boundary surfaces. The theory of large elastoviscoplastic deformations is used to solve the problem. The mathematical model is constructed in cylindrical coordinates.
Numerical Simulation of Gas Evolution from Oil-in-Water Flow for Multistage Separation
Authors: Khamukhin Alexander A. , Nikolayev Eugenii V.
Published: February 2016

The transition from water-in-oil to oil-in-water emulsion is generally very abrupt and it is characterized by a marked decrease in the effective viscosity. The mathematical model of the ascending bubble in the water phase comparatively to the oil phase is described in this paper. Numerical simulation has been performed on two petroleum compositions with different water cut using HYSYS software. More even distribution of gas evolution for multistage separation has been obtained with water cut of oil approximately 75%. These results allow saving of heavy hydrocarbons due to reducing of entrainment into off-gases.
A Three-Dimensional Boundary Element Approach for Transient Anisotropic Viscoelastic Problems
Authors: Igumnov Leonid , Маrkov I.P. , Amenitsky A.V.
Published: February 2016

This paper presents a three-dimensional direct boundary element approach for solving transient problems of linear anisotropic elasticity and viscoelasticity. In order to take advantage of the correspondence principle between viscoelasticity and elasticity the formulation is given in the Laplace domain. Anisotropic viscoelastic fundamental solutions are obtained using the correspondence principle and anisotropic elastic Green’s functions. The standard linear solid model is used to represent the mechanical behavior of viscoelastic material. Solution in time domain is calculated via numerical inversion by modified Durbin’s method. Numerical example is provided to validate the proposed boundary element formulation.
Mathematical Modeling of the Technological Process of Residual Stresses Relief in Metals at Low-Temperature Exposure
Authors: Polonik Marina V. , Rogachev Egor E.
Published: February 2016

Low-temperature technological process of residual stresses relief in metals is modeled. The paper presents the mode of a slow heating stage, holding stage at a constant temperature and slow cooling stage. The holding stage is simulated with creeping properties of materials. Boundary problems are examined and patterns that are responsible for the removal of residual stresses are described. In Norton creep conditions we obtained analytical solutions.
One-Dimensional Wave Propagation in a Three Phase Poroelastic Column
Authors: Igumnov Leonid , Petrov Andrey , Vorobtsov Igor
Published: February 2016

In the present paper, the solution of a finite one-dimensional column with Neumann and Dirichlet boundary conditions are deduced based on the theory of mixture. The solution is obtained in the Laplace domain and the time-step method is chosen to obtain the time domain solution. The material data of Massillion sandstone are used for calculations. The column response to the dynamic loading is examined in terms of displacement, pore water pressure, and pore air pressure.
On Zero-Order Optimization in Problem of the Pressure Computing in Finite Elastic-Creep Deformations
Authors: Anop Maxim , Murashkin Evgenii , Polonik Marina V.
Published: February 2016

The present study is devoted to the problem of optimal loading pressure identification by the prescribed displacements vector. The framework of finite elastocreep strains is used. The problem of deformation of the material in the vicinity of microdefect was considered. Integro-differential equations for the external pressure, irreversible deformations and displacements were derived. The simple zero-order optimization algorithm like the Monte Carlo method for considering problem was proposed. The optimal strain-stress state parameters were computed and analyzed.
Effect of Surface Emissivity on Conjugate Turbulent Natural Convection in an Air-Filled Cavity with a Heat Source
Authors: Miroshnichenko Igor V. , Sheremet Mikhail A.
Published: February 2016

The interaction of conjugate turbulent natural convection and surface thermal radiation in an air-filled square enclosure having heat-conducting solid walls of finite thickness and a heat source has been numerically studied. The primary focus was on the influence of surface emissivity on complex heat transfer. The mathematical model has been formulated in dimensionless variables such as stream function, vorticity and temperature using k-ε turbulent model. The effect of surface emissivity on the average total Nusselt number has been defined. The distributions of streamlines and temperature fields, describing characteristics of the analyzed fluid flow and heat transfer have been obtained. The results clearly show an essential effect of surface radiation on unsteady turbulent heat transfer.
Steady Flow of Incompressible Elastic-Plastic Medium in a Spherical Matrix at Variable Loads
Authors: Polonik Marina V. , Rogachev Egor E.
Published: February 2016

In the framework of the model of large elastic-plastic deformations, the flow of the material in a spherical matrix at varying loads is examined. Simulation is carried out under the condition of steady elastic-plastic boundary. In order to find an exact solution the assumption of an ideal smoothness of the walls and incompressibility of the material is accepted.
Strength and Stiffness Calculation of Small Diameter Gun Drills
Authors: Babaev A.S , Tukhfatullin B.A. , Kim A.B.
Published: February 2016

The results of strength and stiffness calculations of gun drills with steel and cemented carbide stems are presented. Four cross-sections of gun drills are examined and recommendation for selection of proper shape in terms of strength and stiffness is given. Finite element modeling of gun drills shown that the highest stress concentration is at the bottom of the V-shaped flute in the middle of the length of the stem. Gun drill testing under production conditions confirmed the results of finite element modeling.
Efficiency of the Small-Sized System with Thermo-Electrical Conversion of the Heat from Gas Combustion
Authors: Miroshnichenko Taisia , Minaev Sergey , Maruta Kaoru
Published: February 2016

Present paper is an attempt to illustrate a specific character of gas combustion and thermo-electrical processes in small-sized power energy-supply devices with thermoelectric methods of heat conversion. The efficiency of the heat conversion into electricity by using of thermo-elements embedded in the solid walls is estimated for a system with heat regeneration by means of the heat conductivity of the solid elements.
Universal Reference Test Blocks for Liquid Penetrant Testing
Authors: Kalinichenko Nikolay P. , Kalinichenko Aleksey N. , Lobanova Irina S. , Zaitseva Anna A.
Published: February 2016

The overview of penetrant testing quality control is considered. Disadvantages of methods of manufacturing metal check samples are identify, e.g. the implementation of several defects of different sensitivity classes on a single sample. The paper addresses the technology of application of universal nonmetallic reference test blocks containing several artificially-induced defects in the form of cracks of different sensitivity classes for liquid penetrant testing to evaluate the performance of liquid penetrant testing.
Forming Effective Cycle of Round Grinding with Radial Feed
Authors: Shmidt Irina V. , Dyakonov Aleksandr A.
Published: February 2016

This work describes methods of designing grinding cycles and controlling them. We demonstrate that using modern equipment allows programming stepless feed change during whole finishing cycle, giving opportunity to organize more complex high productive cycles of abrasive treatment. Taking this fact into account we suggest algorithm of situation feed correction for forming effective cycle of round grinding with radial feed, allowing maintaining process productiveness and preventing thermal defects.
Model of Hydraulic Rotary Control Valve for Control of Pneumohydraulic Impact Unit
Authors: Deryusheva Valentina N. , Krauinsch Petr Y. , Ioppa Aleksandr V. , Bazarov Andrei S. , Zhukov Artem V.
Published: February 2016

The paper presents constructive scheme, the mathematical model and schematic diagram of the hydraulic rotary control valve of the pneumohydraulic impact unit. Detailed analysis of the mathematical model was made for the purpose to create modes of the movement conducive to improving the work of pneumohydraulic impact unit at the point of switching. The results of mathematical modeling (schematic diagram of matlab) are given.
The Research of Influence of Cold Rolling Conditions on Mechanical Properties Anisotropy of Sheets from Aluminum Alloy 8011A
Authors: Erisov Yaroslav , Grechnikov Fedor
Published: February 2016

The study results of the influence research of reduction ratio in cold rolling on the anisotropy of mechanical properties of sheets from aluminum alloy 8011A are shown in this article. It was determined that the effect of cold rolling on various mechanical properties is different. However, for all characteristics were usual to change the distribution mode and variance reduction in sheet plane during the high ratios of deformation. At the 85-90% reduction ratio it is observed the leveling of mechanical properties in sheet plane.
Effect of Conjugated Heat Transfer Conditions on the Crystallization of the Composite Coating
Authors: Anisimova Maria A.
Published: February 2016

This paper presents the thermophysical model of crystallization of the coating at the conditions of imperfect contact between the coating and sunstrate. The model takes into account the heat exchange of coating with the environment and with the substrate. The influence of thermal resistance of the interface and concentration of filler in the coating on the change of temperature during cooling is investigated.
Metal Surface Treatment with Particle Fluxes Taking into Account the Internal Boundary
Authors: Parfenova E.S. , Knyazeva Anna G.
Published: February 2016

In this paper, the isothermal model of the initial stage of ion implantation process taking into account internal boundary is presented. It is assumed that implantable impurity generates mechanical perturbations. These waves can propagate with different velocities before and after the border. The examples of the waveform evolution at transition across the boundary for different combinations of the model parameters are presented.
Estimation of Combustion Engine Rotation Speed Based on Vibration Signal Analysis
Authors: Avramchuk Valeriy Stepanovich , Kazmin V.P.
Published: February 2016

Diagnostics of mechanisms and systems allows estimating their current state and taking measures if necessary to carry out preventive or other actions for elimination of possible malfunctions. Diagnostics of mechanical parts of combustion engines, as well as other mechanical devices, mechanisms and systems as a whole, is the relevant objective. The purpose of the paper is to research the possible use of time-frequency autocorrelated function to analyze the combustion engine vibration signals to determine possible defects in its work. The paper introduces the basic possible definition of engine operation processes characteristics, being accompanied by emergence of additional frequency components in a spectrum of engine vibrosignal. The time-frequency correlation analysis allows receiving out of spectrum of engine vibrosignal additional information on weak periodic signals characterizing existence of any malfunctions of its mechanical part.
Friction Influence on the Accuracy of the Rotors Automatic Balance
Authors: Ziyakaev Grigoriy R. , Gorbenko M.V. , Gorbenko T.I. , Ivkina O.P.
Published: February 2016

In the given paper the influence of friction forces in the bearing on the accuracy of automatic balancing unbalanced rotors by pendular automatic balance devices is considered. Magnitude of residual offset of a rotor–pendulums system depending on the friction forces is received, that allows defining residual vibration of the mechanism.
Methodological Aspects of Evaluation of Foundry Technologies Effectiveness
Authors: Ardashkin Igor B. , Martyushev Nikita V. , Drozdov Yuriy Yu.
Published: February 2016

A brief analysis of the capabilities of the methodological evaluation of foundry technologies effectiveness is presented by the example of temperature condition adjustment of foundry procedure. It has been revealed that the methodological analysis as applied to different variants of foundry technologies allows determining the most effective ways of development of the foundry technology and increase in its efficiency. A reference to various examples shows the presence of the hidden reserves in foundry technologies. The authors conclude that the methodological analysis allows effective and timely adjustment in the development and modification of foundry technologies and enhancement of its effectiveness. The result of the conducted methodological evaluation is elaboration of the guidelines on the enhancement of foundry technologies effectiveness, aimed at the search of the hidden reserves of already functioning technologies.
Casting Quality Enhancement of Bushings Made of Foundry Aluminium Bronzes
Authors: Korchmit Anton Viktorovich , Martyushev Nikita V. , Drozdov Yuriy Yu.
Published: February 2016

The paper is devoted to the establishment of the technology of castings manufacture out of multicomponent aluminium bronzes for oil and gas producing equipment. Aluminium bronze containing iron has been chosen as a material for casting manufacture. Founding into sand mixtures has been chosen as a manufacturing method. It has been shown that this type of founding allows obtaining the castings with minimal subsequent treatment and high quality surface. The use of the coke furnace at metal melting allows obtaining the castings with high performance characteristics due to gas protection of the melt.
Thermodynamic Analysis of the Effect of ZhS6U Alloy Doping Elements on the Process of Circular Chrome-Aluminizing
Authors: Bakhrunov Konstantin
Published: February 2016

The work presents a thermodynamic study of the influence of doping elements on diffusion saturation of the surface of ZhS6U nickel heat-proof alloy in activated gas media. The paper analyses initial gas media (activators) and their influence on the process of circular chrome-aluminizing.
SLS Setup and its Working Procedure
Authors: Ahmetshin Rinat G. , Fedorov Vasiliy V. , Kostikov Kirill S. , Martyushev Nikita V. , Ovchinnikov Vladislav A. , Razin Aleksey V. , Yakovlev Alexey N.
Published: February 2016

The given paper presents the flowchart of the worked out SLS print setup. The setup consists of a laser source, a reactor tube, a laser sweeping system (scanatory system), a control unit, a gas supply and pumping-out system, a melting process visual review system. The paper covers the results of the given setup operation, introduces a sample made with the use of SLS printing and some of its parameters.
Evaluation of the Effect of LED-Lamp Spectral Content on the Development of Greenhouse Tomato
Authors: Yakovlev Alexey N. , Turanov S.B. , Upadysheva I.N. , Korepanov V.I.
Published: February 2016

The article reports the results of the experiment studied the effect of radiation spectral content (considering its equal intensity in terms of photosynthetically active radiation) on the growth and development of Boets greenhouse tomato breed. We have shown that the effective development of model subjects requires the adaptation of radiation spectral content depending on the growth period and type of a plant, unlike the illumination level. The obtained results demonstrate the necessity of creating an adaptive irradiation unit.
Design of Composite Wire for Arc Welding and Ni3Al-Based Alloys Surfacing
Authors: Dubtsov Yu.N. , Zorin I.V. , Sokolov G.N. , Artem'ev A.A. , Lysak V.I.
Published: February 2016

The composite wire compound calculation methods were considered, factoring stoichiometric ratio values of the elements of the intermetallic γ'-Ni3Al, draft, elongation and compaction of the filling’s components as well as the values of alloy transfer effervescive. It is found that during argon-arc surfacing the components of the composite wire’s filling and coating are melting uniformly at the welding current density from 30 to 50 A/mm2. The correlation was established between the composition, the construction of the composite wire for arc welding and surfacing and the structure of Ni3Al based deposited metal. It is shown that the developed composite wire provides the deposited metal with the structure of nickel aluminide economically alloyed with wolfram, molybdenum, tantalum and chrome.
Influence of Granulation of Powder Charge of Titanium-Boron on Regularities of Self-Propogating High-Temperature Synthesis of Porous Materials
Authors: Andriyanov D.I. , Amosov Aleksandr P. , Samboruk A.R.
Published: February 2016

The results of studies of fabrication of porous titanium boride TiB by self-propagating high-temperature synthesis (SHS) using ordinary (not granular) and granular initial powder charge titanium-boron are presented. The influence of the amount of titanium in the charge, the granule size and the pressure of compaction of the charge on the structure, porosity, phase composition and compression strength of the resulting porous materials is described. The results of studies were obtained with the use of the scanning electron microscope, diffractometer and universal testing machine.
The Influence of Aluminium Nanopowder Density on the Structure and Properties of its Combustion Products in Air
Authors: Ilyin Alexander P. , Root Liudmila O. , Mostovshchikov Andrei V.
Published: February 2016

The intermediate and final combustion products of pressed aluminum nanopowder are studied. It is found that the main combustion product is aluminum nitride. In the intermediate stages of combustion, aluminum oxide (γ-Al2O3) and oxynitride (Al5O6N) are the first to form on the sample surface, and aluminum nitride is formed next. The use of sliding (incident at a small angle to the surface) synchrotron radiation made it possible to determine with high accuracy (in time) the sequence of stages of formation of crystalline products during combustion of the aluminum nanopowder.
Developing Nanomaterials with Given Properties Based on Aluminum Oxyhydroxide
Authors: Gryaznova Elena N. , Shiyan Ludmila N. , Irtegov Yuri A.
Published: February 2016

This paper reports about the method of modified nanomaterials. The aluminum oxyhydroxide was modified by manganese ions (II) during the synthesis. It was shown that modified aluminum oxyhydroxide has new function properties such as catalytic properties. It was shown that the modified aluminum oxyhydroxide with the high concentration of manganese ions (II) could be used in the reaction of the oxidation of methane.
Use of Zinc Oxide Nanopowder as an Additive in a Tribotechnical Composite Based on Refractory Metal Disulfide
Authors: Anisimov Evsei , Irtegov Yuriy , An Vladimir , Druzyanova Varvara , Burtsev Nikolay , Khaskelberg Mikhail B.
Published: February 2016

Tribological properties of a composite mixture based on zinc oxide nanoparticles and nanolamellar tungsten and molybdenum disulfide powders have been studied. XRD and TEM of ZnO nanoparticles produced by electric discharge of metallic granules in an H2O2 solution were analyzed. The tribological tests showed ZnO nanoparticles additive in metal disulfide powders did not practically change the friction coefficient in comparison with pure WS2 and MoS2 powders at 25 °C in air. At 400 °C zinc oxide nanoparticles in composite lubricants positively affect the wear resistance.
The Effect of Cu–Mo–S Coatings on Wear Resistance of Copper Friction Pair
Authors: Sergeev Viktor , Zharkov Stanislav Yu. , Kalashnikov Mark P. , Sungatulin Alfred R.
Published: February 2016

The wear resistance of the coatings on the basis of Cu–Mo–S with a copper friction pair was studied by tribological tests in argon and air environment. Microstructure of the coatings was investigated by transmission and scanning electron microscopy. Fiber-globular structure of the coatings was evaluated. Cu–Mo–S coatings can increase the wear resistance of a copper friction pair in ~ 71.7 and ~ 7.9 times in argon and air atmosphere, respectively. Decrease of friction coefficient of copper friction pair from 0.59 to 0.27 (with coating) has been observed during tribological tests in air environment.
The Influence of Hydrogen on the Process of Plastic Flow Self-Organization in Ti
Authors: Lunev Alexey , Nadezhkin Mikhail V. , Barannikova Svetlana , Zuev Lev B. , Ionova Natalia A.
Published: February 2016

The paper presents the study of the effect of hydrogenation on the mechanical properties of commercially pure titanium. It has been found that the localized deformation zones occurring in the plastically deforming Ti samples are stationary dissipative structures. The kinetics of dissipative structure evolution was studied. The hydrogenation treatment is found to enhance a tendency to strain localization in as-treated material, which affects significantly material strength properties.
Estimation of Orientation and Optical Properties of Plane Crystals by Polarization Characteristics of Lidar Returns
Authors: Shefer Olga V. , Rozhneva Olga V. , Loskutov Vitaliy V.
Published: February 2016

Under the method of physical optics, there presented a calculation technique of the Stokes parameters ratios to study the polarization characteristics of lidar returns. An ensemble of preferentially oriented plane crystals is considered as a model medium. The iterative algorithm to estimate the optical properties of the particles and its space orientation using the Stokes parameters ratios is presented.
Optical Model of Medium for the Numerical Imitation of Wave Surface Forming High-Intensity Reflected Radiant Energy
Authors: Shefer Olga V. , Loskutov Vitaliy V. , Rozhneva Olga V.
Published: February 2016

An optical model of medium employing a system of plane particles is presented to study numerically the high-intensity reflected radiant energy. The characteristics of anomalous backscattering of optical radiation are received by the method of physical optics. The calculation results for spectral dependence of backscattering coefficient on microphysical and optical properties of particles are displayed in this work. The informative property of characteristics of specularly reflected radiation was determined to learn the nature of particle matter and their microphysical parameters.
Luminescence of LiF Crystals Doped with Metal Oxide Impurities
Authors: Korepanov Vladimir I. , Petikar Pavel V. , Ge Guang Hui
Published: February 2016

The luminescence spectra and luminescence excitation spectra have been investigated in the spectral range of 6.5–4.4 eV. Pulsed cathodoluminescence of LiF-WО3 and LiF-TiО2 crystals has been studied in the temperature range of 20–300 K. All LiF crystals doped with metal oxides are found to have similar luminescent properties and identical structure of the luminescence centers. It is assumed that photon and electron bombardment induces excitation of different types of О2− oxygen centers perturbed by impurities and Fe2О3, WО3 and TiО2 included in the oxygen complexes.