bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Geometric Positioning Algorithm of Vision System in High Speed and High Precision Chip Mounter
Authors: Huang Yin Hua , Li Dong Bo
Published: October 2015

Considering features of PCB marks and components image, in order to search a consistent location for reference images in multidimensional parameter space, the algorithm of geometric characteristic recognition location is proposed. Geometric location algorithm mainly include model training and real-time search. Compared to edge location and traditional localization methods, which not only adapt the gray-scale linearity and the gray non-linear changes, but also support changes in scale and perspective. Numerical results shows that the position deviation of geometric positioning algorithm is less than 0.5 pixel, the angle deviation is less than 0.5 degree. This algorithm is robust, simple, practical and it is better than the traditional location method.
Individual Tree Detection from High Spatial Resolution Imagery Using Color and Texture Features
Authors: Bian Yan Shan , Wu Ling Da , Yu Rong Huan , Chen Zhi Ke
Published: October 2015

An automatic individual tree detection method from pure image is proposed. Color and texture features are selected to form a vector for a pixel-level classification, then trained to assign a label to each pixel. Other features can be integrated into the pixel vector for extracting more information of trees. An ensemble method combining multiple logistic regression classifiers improves effectiveness of the single pixel-level classifier. Then spectral, shape and knowledge characteristics of individual tree crowns are used for tree top localization. At last, tree crowns are delineated by region-based algorithm.
A Research on Smart Tourism Service Mechanism Based on Context Awareness
Authors: Feng Wen Long , Duan Yu Cong , Huang Meng Xin , Dong Lin Feng , Zhou Xiao Yi , Hu Tao
Published: October 2015

The traditional tourism services tend to use tourism resources as the center. They ignore individual characteristics and contextual information of the user side. The provided service is static, and doesnt meet the real needs of the users. A service mechanism based on context awareness is presented which consists of data, platform and services. It sets up data center based on users and gets context data according to rules .It uses the cloud computing technology to provide distributed processing, storage and retrieval capability for big data. It also establishes tourism service confirming to requirements of the users and dynamic adjusts service mode according to the user context information. Simulation results show that the mechanism can realize the demand for tourism services in conjunction with the individual characteristics of user.
Fast and Effective Algorithm of Iris Localization Based on Hough Transform
Authors: Wang Bao Qiang , Zhang Lin
Published: October 2015

The purpose of the paper is to research a fast and effective algorithm of iris localization based on Hough transform, for improving the quality of iris localization. The methods of practice include as follows. Firstly, the pupil center is estimated by using of a metric. Secondly, the binary edge image is transformed into the polar coordinates. After the rules of horizontal edge selection are used to select horizontal edge, the edge-selected image is transformed into the Cartesian coordinates. Finally, the Hough transform and the coupling relationship of the boundaries are used to determine the parameters of boundaries, and the biggest boundary parameter is selected for the estimation of the iris boundary parameter. Experiments indicate that the proposed algorithm is effective and available.
Fractal Analysis of the Optimal Objective Function
Authors: Qiu Xiao Hong , Tan Yong Bo , Li Bo
Published: October 2015

The fractals of the optimization problems are first discussed. The multi-fractal parameters of the optimal objective function are computed by the Detrended Fluctuation Analysis (DFA) method. The multi-fractal general Hurst Index is related to the difficulty to solve the optimization problem. These features are verified by analyzing the first six test functions proposed on 2005 IEEE Congress on Evolutionary Computation. The results show that the different objective functions have obvious different multifractal and the general Hurst Index can be used to evaluate the difficulty to solve the optimization problem.
Fast Collision Detection Algorithm Based on Parallel Doubling Technology
Authors: Qu Hui Yan , Zhao Wei
Published: October 2015

This paper presents a doubling technology of fast traverse of the list .When parallel call recursively, distance of the division between data gradually doubled after completion of the operation, it was completed the operation of all the data the distance of 2M after calculation of M times. The experiment results show that the proposed method has higher efficiency compared with the normal stand-alone computing and parallel computing so it achieved real-time of CD.
Strong Consistency of Maximum Likelihood Estimators n Exponential Sequential Model
Authors: Yin Chang Ming , Chen Bo Hong , Liu Shuang Hua
Published: October 2015

For the exponential sequential model, we show that maximum likelihood estimator of regression parameter vector is asymptotically existence and strongly consistent under mild conditions
The Research and Implementation of Virtual Laboratory Based on VRML
Authors: Jiang Hua
Published: October 2015

Virtual laboratory for experimental teaching provided a new form, virtual reality modeling language (VRML language) for virtual laboratory construction provides economic effective means. Virtual experiment technology as a new teaching media, which appears to modern teaching will no doubt, especially remote teaching far-reaching impact .This paper discusses the realization method of the virtual laboratory based on VRML.
A Pilot Design Method Based on Cyclic Shift PTS
Authors: Yang Qi Song , Long Ken
Published: October 2015

Partial transmit sequence (PTS) scheme is one of the most effective way to reduce peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. The cyclic shift on time-domain PTS has better performance in PAPR reduction than that of the conventional PTS (C-PTS), and the receiver can recover phase rotations without using side information (SI). However, the receiver must know channel response before detecting and perform complex operations in order to detect the phase rotation factors. In this letter we proposed a pilot design method based on cyclic shift on time-domain PTS, which can estimate phase rotation factors and channel response more easily. Simulation results show that the PAPR performance of the proposed method is approximately same as the cyclic shift PTS scheme and the BER performance is also as well as C-PTS with perfect SI in multipath channel scene.
Research of FH-MFSK Underwater Acoustic Communication Based on Non-Binary LDPC Codes
Authors: Fan Wei Wei , Li Bo , Zhang You Wen , Sun Da Jun
Published: October 2015

Compared with binary-modulation, Multiple-modulation can obtain higher rate of transmission in the condition of same symbol-rate. If using binary channel codes with multiple-modulation, there exists an problem of information-loss of the probability from bit to symbol conversion. Underwater acoustic channel is an multipath, time-variation, high-noise and strong doppler-effect wireless channel, which leads to high error-rate caused by signal distortion. To solve the problems above, we adopt FH-MFSK modulation to overcome the inter-symbol interference by multipath. The PN sequence is used as a frame synchronization signal and frequency energy accumulation method is used to detect the frame-synchronization. PN hopping signal is chosen to estimate the doppler frequency-shift and using non-binary LDPC codes based on symbol for channel error codes. Finally, We perform numerical simulations and the experiments on the lake to show that compared with binary LDPC codes, non-binary LDPC codes for multiple-modulation can achieve same error-rate under lower SNR.
Negotiation Protocol for Location Privacy
Authors: Park Hyun A. , Kim Hyung Seok , Kim Jee In
Published: October 2015

As metropolitan areas have expanded and been surrounded by huge buildings and complicated express ways, it has been increased to utilize advanced ICT(Information Computer Technology) devices and systems to innovate utility services such as GIS(Geographic Information System). Keeping abreast of this, location privacy has emerged as a critical issue in ubiquitous computing environments for the metropolitan areas. Nevertheless, the focus of the location privacy is only about personal location information, not about location information such as the place itself. However, in a real world, as seen in the precedent of ‘Dow Chemical vs. United States’ or in controlled areas of military districts, we have already recognized the importance of location information. In this paper, we propose a negotiation protocol to protect location information as well as personal location information. Thus, we can achieve real data protection through the negotiation-process in the respect of self-regulation.
Irregular Sampling of GPS Signal for Real-Time Implementation of Pipelined PFFT
Authors: Huang Jian Hua , Luo Gao Yong
Published: October 2015

We present a nonuniform method sampling to form the 1 105 points of GPS signal for real-time implementation of prime factor Fourier transform (PFFT) processor, which uses less resource with more utilization rate, and is more efficient and computationally faster than fast Fourier transform (FFT). The high-speed capturing method by irregular sampling for GPS quick positioning is developed to obtain the specified number of sampled data to suit the requirement of fast pipelined PFFT implementation. Simulation results show that the irregular sampling method is efficient in terms of computational complexity and achieves minimum operations of sampling for 1 105 samples based PFFT processing.
Modulation Recognition of MQAM Signals Based on Semi Supervised Clustering Theory
Authors: Li Ping Ping , Sun Gang Can , Shen Jin Yuan
Published: October 2015

In the modulation recognition of MQAM signals cluster points of traditional clustering algorithm were not accurate, iterations of the algorithm are multiple and the curve of square error function was not smooth. To solve these problems, this paper presents a theory of modulation recognition method for reconstruction of MQAM signal constellation diagram based on semi supervised clustering, using labeled samples to guide the membership degree and the clustering center update. Analysis the receiving constellation and extracting the characteristic parameters R of constellation compared with parameter Rs of standard constellation, to realize modulation recognition of the different order of MQAM signal. The results show that the method to identify the MQAM signal at rate of 90. Convergence of iterative process is reduced from 40 to 8 times. The algorithm has low computation complexity and the square error function curve is smooth.
A Study on Al2O3/SiC/B4C Reinforced Cu-Sn Matrix Composite by Warm Compaction Powder Metallurgy
Authors: Öksüz K. Emre
Published: October 2015

Increasing density is the best way to increase the performance of powder metallurgy materials. Conventional powder metallurgy processing can produce copper green compacts with density less than 8.3g/cm3 (a relative density of 93%). Warm compaction, which is a simple and economical forming process to prepare high density powder metallurgy parts or materials. CuSn matrix composites with %2 weight fractions of reinforcement particles were prepared using warm compaction and sintering. Micro-structural aspects were observed by optical microscope. Density, hardness and wear tests were also performed. Abrasion resistance measurements were used to study the abrasive behaviors of CuSn matrix and its composites. The effects of reinforcement and preparation methods on the microstructure and mechanical properties of composites have been investigated.
Functionalized Antimicrobial Thin Films Based on Antibiotic Imbedded in Polymer Matrix for Implants Coating
Authors: Floroian Laura , Badea Mihaela , Floroian Dan , Moga Marius , Samoila Cornel
Published: October 2015

In this study we investigated the possibility to use in implantology of a new composite made from antibiotic imbedded in polymer matrix with goal to merge the mechanical advantages of the metallic substrate with the excellent corrosion protection of the polymer and antimicrobial effect of the antibiotics. Furthermore the addition of small quantity of bioactive glass allows the antibiotic release and hastens the osteointegration. The biological properties of the coatings were tested including the microbial viability using Gram - and Gram + bacterial strains with known antibiotic susceptibility behavior. The proposed system could be used for development of new antimicrobial materials or strategies for fighting medical biofilm pathogens often implicated in the occurrence of chronic infections.
Considerations Regarding Wetting Conditions in Aluminium-Alumina Composites
Authors: Ploscaru Alexandru , Ştefănescu Florin , Neagu Gigel , Mihai Alexandrina
Published: October 2015

The mechanical and physical properties of metallic composites with aluminium matrix and alumina particles as complementary material have made them a good candidate for automotive, aerospace and many other applications. Some calculus regarding main aspect of wetting conditions between aluminium and alumina are made by using special literature information. Also, some improvement techniques of wetting conditions are described.
Mechanical Characterization of the PM Hydroxyapatite-Based Biocomposites Elaborated by Two-Step Sintering
Authors: Sima Gabriela , Cinca Ion , Teisanu Cristina , Gîngu Oana
Published: October 2015

The paper focuses on the mechanical characterization of porous biocomposites based on hydroxyapatite submicronic powders (< 200 nm), respectively micronic powders particle (30-50 μm) as matrix, reinforced by titanium hybrid powders (15 and 20% mass; 100-150 μm) as foaming agent. Another foaming agent used is calcium bicarbonate powder (5 and 10% mass). The mixture homogenization was made in a Frisch-Pulverisette 6 type planetary mill (n=200 rpm), for 30 minutes. The green compacts were processed by unilateral cold compaction at 150 MPa. The two-step sintering technology (TSS) has been applied to the green parts, on the Nabertherm conventional furnace: at 900°C for few minutes (first step) and at 800°C for 450 minutes, respectively 600 minutes (the second step). The mechanical characteristics (compression modulus G [MPa] and ultimate compression strength σUTS [MPa]), were studied using the universal mechanical testing machine INSTRON 3382 and compared with the mechanical characterization of the human bone.
The Influence of the Foaming Agents on the Porosity of the PM Hydroxyapatite-Based Biocomposites Processed by Two-Step Sintering
Authors: Teișanu Cristina , Ristoscu Carmen , Sima Gabriela
Published: October 2015

This paper presents a comparative analysis of the foaming process developed in hydroxyapatite (HAp)-based bicomposites as a function of the foaming agent. The matrix of the biocomposite consists of either submicronic or micronic powder particles of HAp. The titanium hydride powder was added as reinforcement’s precursor as well as blowing agent, and in order to increase the biocomposites’ porosity calcium carbonate was added as space holder agent. The powders mixture was homogenized in a planetary ball mill with a single grinding bowl for 1 minute in air. Uniaxial cold compaction at 120-170 MPa was performed in order to obtain cylindrical green parts, which next were heated in argon atmosphere using the two step sintering technique at temperatures of 900 °C for 1 minute and 800°C for 450 - 600 minutes. The porosity of the biocomposite is analysed through calculations and SEM and EDS analysis highlighting the influence of the above mentioned foaming techniques (blowing and space holder).
The Influence of the Cooler Material on the Structure and Hardeness Gradient of a Grey Pearlitic Cast Iron
Authors: Munteanu Sorin Ion , Ciobanu Ioan , Crisan Aurel , Bedo Tibor , Feraru Daniel
Published: October 2015

The structure and properties of grey cast iron castings are considerably influenced by the cooling rate during solidification. In order to obtain grey cast iron parts with a hard superficial layer (wear resistant), external metallic coolers are placed on those surfaces during casting. This is the case of cam pushers, camshafts, driving shafts, metalworking rolls, etc. Cast iron coolers or steel coolers are mostly used in practice. The cooling rate during solidification is influenced by the thermo-physical characteristics of the coolers. This paper presents the results obtained by simulation and experimental research on coolers material influence on the structure and hardness of the surface layer of a pearlitic cast iron sample. It was studied the solidification of samples with dimensions 20 x 20 x 60 mm, cast of pearlitic cast iron in six variants: without a cooler and in the presence of some metallic coolers of different thermo-physical characteristics (iron, steel, copper, titanium and aluminum coated with a thin layer of steel). It was studied the influence of cooler material on structure of the superficial layer, on thickness of the hardened layer, on superficial hardness, on the temperature field and cooling rates. Conclusions are drawn regarding these influences and the possibility of using external coolers in industrial practice.
The Technological Comparative Analysis between the Vertical MAG Welding with Solid Wire and with Cored Wire
Authors: Burca Mircea , Seculin Radu Cristian , Țunea Daniel
Published: October 2015

The vertical welding is generally considered difficult because of the danger of the flow of the melting bath and the melted slag under the action of gravity. In the case of the MIG/MAG welding process, the technological measurements that are being regarded in the ascending and descending of the vertical welding refer to: the use of transfer modes through short circuit and pulsed current, the use of core wires instead of solid wires, the crossing from the semi-mechanized to automatic or robotical welding, that allows the use of complex radial oscillation systems, that assure a good control of the metal bath. The paper wants to make a comparative technological and economical analysis between the vertical ascendent MAG welding using solid wire or core wire. The advantages that are being presented are for the use of the core wire with a rutilic core for the vertical, ascendent welding from a technological, qualitative and economical point of view in the mechanical corner welding process of a 10 mm thickness steel plates.
Research on the Use of the MIG/MAG-Tandem Procedure in Welding X52MS Plates for the Manufacture of Pipelines
Authors: Iovanas Radu , Toma Cosmin , Iovanas Daniela Maria , Roata Ionut Claudiu , Anton Viorel
Published: October 2015

The pipelines used for carrying fluids and gas, made of specially designed steels in keeping with their intended uses, are obtained by welding on generator or by spiral welding, in a wide range of diameters (from 350 to 1800 mm) and pipe wall widths (between 6 and 40 mm). At present, the following welding procedures are used: automatic submerged arc welding (with 1 and 2 wires), combined with the unilateral or bilateral MIG/MAG welding procedure, according to plate thickness and edge working method. Ongoing researches focus on improving the end product [1, 2, 3, 4, 5, 6] by replacing the submerged arc welding procedure with other welding procedures which use less energy and have high deposit rates. This paper presents the results obtained by using tandem MAG welding, with two wires (2 x ø1.2 mm), in welding Y joint X52MS steel plates. The welds were carried out using a QUIROX 315 welding robot, with a 2-wire tandem MIG/MAG welding head, supplied by 2 QUINTO-GLC 603 welding sources, equipment found at Research Centre C12, Advanced Welding Eco-Technologies, owned by ICDD - UTBV. The results of the tests (carried out as per the enforceable regulations) concerning the characterisation of the executed welds proved that it is possible to obtain welds with lower energy use and lower material-relates costs and high productivity and quality.
Finite Element Modeling of Raw Materials Milling Used in Food Industry
Authors: Lupu Mirabela Ioana , Pădureanu Vasile , Steriu Valeriu
Published: October 2015

In a series of processes which occur in various processing industries, it is necessary that the raw materials, finished products or intermediate products to be grind to accelerate the technological phase, to obtain a product from raw materials or even only for commercialization the products [1]. Modeling program can be used to study and understand the behavior of an individual grain under compression stress. The results from previous studies have shown that the modeling program can be used [2] for predicting the grain deformation, the compression stress and the energy consumption obtained as a consequence of the grain compression process. This paper presents a comparison of a modeling and experimental study on the influence of the physical properties of a single corn seed on compression grinding process. The mathematical model by finite element method for the corn compression process is made in order to establish the forces that appear to the first cracks of the grain, to determine the maximum force of the corn compression, the deformations of the grain resulted after the compression and the energy consumption during the compression process. For this simulation it was used the mechanical structural module in 3D space of the COMSOL Multiphysics software. The experimental researches were carried out on an individual corn seed, using the materials testing machine Zwick / Roell 5 kN, to which was adapted the compression device [3]. In the experimental researches have been followed the same properties as at the mathematical modeling.
Optimization of Abrasive Water Jet Cutting for Carburized Pieces
Authors: Barabas Sorin Adrian , Florescu Adriana , Calefariu Gavrilă , Sarbu Flavius
Published: October 2015

Parametric optimization model was made by now for abrasive water jet process, only for materials with uniform hardness. Pieces, subject to deep carburized treatment with high hardness in layer and softened in core, have a different behaviour and it is necessary to estimate new values of the system processing. Experiments consisted in cutting with abrasive water jet of rectangular samples with 10 mm thickness and deep carburized layers with 8 mm thickness, obtained as a result of deep carburized heat treatment. Abrasive water jet, initially meets the carburized layer with 62 HRC, after perforation followed the layer with fine sorbite structure (30 HRC). The different hardness causes a change in the trajectory of abrasive particles, determining deformations and micro cracks in materials to the limits of carburized layers. Choosing an optimal cutting regim becomes important not only economically, as well as qualitative. Measurements allow drawing conclusions that can be generalized to the materials with different hardness.
Pores Size Influence on the Permeability for Copper Foams
Authors: Pop Mihai Alin , Geamăn Virgil , Radomir Irinel , Bedő Tibor
Published: October 2015

In the paper are presented the techniques for obtaining metallic foams based on copper. The permeability of them is described. The metal foams in this case are made from a mixture of copper and NaCl in well-established proportions (20%, 30% and 40% Cu), pressed (the mixture) in mould and sintered at temperatures of 780°C and 830°C. Proper knowledge’s of the permeability (K) are important and should be defined properly [1]. The present study was carried out to have an understanding the influence of different permeability values for different NaCl concentrations in the foams. The necessary equipment was adapted for this purpose. The permeability values obtained for this reason was correlated with the pore size and number of pores per square centimeter. With the increasing of pore diameters and copper proportion the increasing of permeability of metallic foams was also measured.
Studies on the Possibility of Recycling Waste Bronze
Authors: Radu Stefan , Demian Mihai , Demian Gabriela , Ciobanu Mariana
Published: October 2015

This paper presents the results of experimental research on the possibility of using bronze chips recovered from the cutting process of the molded sliding bearings to obtain new sintered sliding bearings. This paper presents the results of experimental research on the possibility of using bronze chips recovered from the cutting process of cast sliding bearings in developing new sintered bearings). The cooper-tin alloys have many applications in the industry and they are usually used as antifriction materials to sliding bearings construction. Chips recovered from cooper-tin resulted from the cutting process were used to obtain metal powders in planetary mills. Recovered powders were then compacted to a unilateral mold and then were applied a sintering cycle in argon. To the obtained samples we applied wear tests in conditions of dry friction to prove the possibility of use as anti-friction material for sliding bearings in similar conditions to those obtained from industrial powders.
Effects of Heat Treatment on Strength Wear Sintered Alloy Steels
Authors: Bucşe Ionela Gabriela , Ghermec Olimpia , Ciobanu Mariana , Ghermec Christian , Nicolicescu Claudiu
Published: October 2015

This paper presents the results of experimental research on thermal treatment of alloyed sintered steels and much the development of Fe‒3Mn‒1Mo‒1.5Cr‒0.5B‒0.45Graphite powder using mechanical alloying (MA). It was analyzed the influence of MA time on the morphology of the compound by electron microscopy SEM. The research has followed the study of the particle size powder mixtures influence obtained by mechanical alloying, compaction parameters and sintering process on the chemical and structural characteristics of the alloyed sintered steels. Thus there were compacted samples at 600, 700 and 800 MPa. The samples were heated using argon at a temperature of 1150°C using 60 minutes as a maintaining time. Cooling to the room temperature was achieved using a speed of about 30°C/ minutes. With the resulting steels, we have made metallographic determinations using optic microscopy and determinations of the main mechanical properties. Heat treatment took place (heating at 960°C and cooling in the H2O solution and 10% NaCl) in order to improve the properties of alloyed sintered steel hardness and strength. Specimens quenched and tempered have high wear coefficient compared with specimens as-sintered.
Studies on few Water Based Nanofluids Behavior at Heating
Authors: Moldoveanu Madalina Georgiana , Minea Alina Adriana
Published: October 2015

Application of nanoparticles provides an effective way of improving heat transfer characteristics of fluids. Particles less than 100 nm in diameter exhibit different properties from those of conventional solids. Compared with micron-sized particles, nanophase powders have much larger relative surface areas and a great potential for heat transfer enhancement. Some researchers tried to suspend nanoparticles into fluids to form high effective heat transfer fluids. Some preliminary experimental results showed that increase in thermal conductivity of approximately 60% can be obtained for some nanofluids consisting of water and 5 vol% CuO nanoparticles. So, the thermal conductivity of nanofluid was found to be strongly dependent on the nanoparticle volume fraction. So far it has been an unsolved problem to develop a sophisticated theory to predict thermal conductivity of nanofluids, although there are some semi empirical correlations to calculate the apparent conductivity of two-phase mixture. In this article, several correlations for predicting the nanofluid thermal conductivity will be compared and results will be discussed for three water based nanofluids.
Graphite Phase Characteristics in Compacted/Vermicular Graphite Cast Iron Inoculated in the Mould
Authors: Firican Ciprian , Riposan Iulian
Published: October 2015

The objective of this research paper is to examine the effects of adding an oxy-sulphide inoculant enhancer alloy [OS-IE = S,O,Al,Mg-CaSi alloy] to a conventional CaBa-FeSi alloy and to examine the graphite phase characteristics in these irons, as affected by different in the mould inoculants, for resin sand mould castings. The surface layer of all the Mg,RE-FeSi treated compacted / vermicular graphite cast iron samples with 0.018 – 0.023% Mgres is influenced by S diffusion from Furan Resin–P-Toluol Sulphonic Acid (PTSA). The graphite phase is strongly influenced in this surface layer. Inoculation has a visible, beneficial effect in both the surface layer and the body of casting. Even with the highest solidification rate, at the surface layer of the 25mm round bar samples, the structure has the lowest graphite nodularity (15-20%), due to the sulphur content in the mould binder, in contrast with 40-50% nodularity in the casting body. Adding two inoculant type alloys Ca,Ba-FeSi + [OS-IE], led to the highest compacted / vermicular graphite formation. Inoculation with [OS-IE] only appears to encourage the formation of a high number of small graphite nodules that also display higher nodularity. This is represented by the second highest levels for circularity and sphericity shape factors at a much smaller inoculant addition, compared with a conventional Ca,Ba-FeSi inoculant addition. Inoculation with oxide-forming elements or pairing oxy-sulphide inoculant enhancer with commercial inoculants appears to be an economical alternative to rare earth (RE) based inoculants in compacted / vermicular graphite iron casting production.
Estimation of Salt Rocks’ Long-Term Strength in Natural Conditions
Authors: Baryakh Alexander A. , Lobanov Sergey Yu. , Lomakin Ivan S.
Published: October 2015

New approach to construction curve of salt rock’s long-term strength based on the diagram’s analysis of the earth surface subsidence growth under the influence of underground mining has been proposed. Performed verification of received estimation showed acceptable fit of mathematical modeling results of interchamber pillars’ deformation and fracture processes with in-situ data.
Mechanical and Microstructural Aspects of Localized Plastic Flow
Authors: Sokovikov Mikhail , Chudinov Vasiliy , Bilalov Dmitry , Oborin Vladimir , Uvarov Sergey , Plekhov Oleg , Bayandin Yuriy , Naimark Oleg
Published: October 2015

The behavior of specimens dynamically loaded during the split Hopkinson (Kolsky) bar tests in a regime close to simple shear conditions was studied. The lateral surface of the specimens was investigated in-situ using a high-speed infra-red camera CEDIP Silver 450M. The temperature field distribution obtained at different time allowed one to trace the evolution of plastic strain localization. The process of target perforation involving plug formation and ejection was examined using a high-speed infra-red camera and a VISAR velocity measurement system. The microstructure of tested specimens was analyzed using an optical interferometer-profiler and a scanning electron microscope. The development of plastic shear instability regions has been simulated numerically.
Numerical Method for Solving the Problem of Thermomechanics of Polymeric Environment in Conditions of Phase Transition
Authors: Kulikov R.G. , Kulikova T.G. , Trufanov Nikolai A.
Published: October 2015

A methodology and a numerical algorithm of solving boundary problems of mechanics of deformable crystallizing elastic polymer media have been developed. A class of problems describing processes taking place in polymer products during their manufacturing is considered. Due to the significance of shrinking deformations the problem is considered within finite deformations theory. Constitutive relations are built on base of Peng-Landel potential. A ‘weak’ variation problem statement based on Galerkin approach is used. The offered algorithm is based on linearization methodology when small deformations are applied to finite ones. Deformation process is considered as a sequence of transitions through intermediate configurations. This approach makes possible to bring the received solution to the sequence of linearized boundary problems for which effective numerical algorithms have been designed. Numerical procedure is based on the technology of finite element method. Increments of displacements on the considered time step are taken to be nodal unknowns. The offered algorithm is applied to solution of the problem concerning the polyethylene pipe deformation during its manufacturing. Main advantages of the proposed algorithm have been defined.
Analysis of Thermal Conditions within the Flow Conduits of MHD-Devices
Authors: Glot I. , Matveenko V.P. , Khripchenko S. , Shardakov I.
Published: October 2015

The paper presents an experimental and theoretical approach to the modeling of non-stationary thermal processes in the elements of MHD-devices. The theoretical part of the approach is based on a mathematical formulation of the non-stationary heat conduction problem and its numerical implementation by the finite-element method. The experimental part involves a series of preliminary and verification tests. A comparison of the results obtained in these experiments with the calculated data allowed us to specify heat conduction coefficients and to pick up space-time parameters of the algorithm to ensure a high degree of adequacy of mathematical description of thermal fields. The approach made it possible to set the process conditions under which the necessary level of preliminary heating of a conduit of the MHD-pump can be achieved without loss of its mechanical strength.
Effect of Boundary Conditions on the Hydroelastic Vibrations of Two Parallel Plates
Authors: Bochkarev Sergey A. , Lekomtsev Sergey V.
Published: October 2015

This paper presents the results of numerical solution of the 3D spectral problem on natural vibrations of two parallel identical rectangular plates interacting with a quiescent fluid confined between them. Based on the developed finite element algorithm several examples have been considered to analyze the influence of the fluid height and boundary conditions on the natural frequencies and vibration modes.
The Optimal Placement of the Piezoelectric Element in a Structure Based on the Solution of the Problem of Natural Vibrations
Authors: Sevodina Nataliia V. , Yurlova Nataliia A. , Oshmarin Dmitriy A.
Published: October 2015

It is a wll-recognized fact that effective damping of vibrations in the structure containing piezo-electrical elements strongly depends on their distribution throughout the structure. In this paper, we consider the possibilities of applying the problem on natural vibrations of elecro-elastic and electro-viscoelastic deformable bodies for identification of optimal location of piezo elements. The results of numerical simulation of the optimal piezo element arrangement in the structure, providing generation of the maximal electric potential at the prescribed resonance frequencies, are presented. The investigation has been carried out for the prototype of the plane wing, representing cantilevered symmetrical and nonsymmetrical trapezoidal plates. The possibilities of applying the problem of natural vibrations for the purpose of optimal performance of piezo elements as sensors and actuators are analyzed.
Numerical Modelling of Layered Composite Materials with Embedded Optical Fiber Sensors
Authors: Korepanov Valery V. , Serovaev Grigory S. , Yurlova Nataliia A.
Published: October 2015

One of the crucial points in making materials with embedded optical fiber sensors is obtaining information about stress-strain state which helps to asses the influence of embedded optical fibers on integral mechanical properties of the structure and redistribution of stresses and strains in the area around optical fibers. In this paper models of woven composite material with embedded optical fibers are studied with numerical results achieved with the help of finite element method in case of GFRP VPS-33 material with fabric filler T-10-14 and epoxy resin ENFB-2M. Numerical results about the change of stiffness parameters of plate specimens in cases of tension and bending are obtained. Evaluation of stress state change near embedded optical fiber in different cases of optical fiber orientation with respect to loading and in the presence and absence of resin pocket defect with polyamide optical fiber coating taken into account is given in this study.
Analysis of Cracking in a Reinforced Concrete Beam
Authors: Bykov A. , Matveenko V.P. , Serovaev Grigory , Shardakov I. , Shestakov A.
Published: October 2015

Numerical models describing crack formation and growth in reinforced concrete give reasonably good estimates of the bearing capacity and durability of an element of the structure without expensive full-scale tests. In this paper, a finite-element model is proposed to study the failure of a rectangular reinforced concrete beam subjected to four-point bending. The results of quasi-static simulation and the data obtained by taking into account inertial forces are compared. The feasibility of taking into account inertial forces is justified by assessing the contribution from kinetic energy (above 30%) at the instant of crack formation to the total mechanical energy of the system. Comparison of the experimentally obtained and calculated crack patterns is performed. It is shown that the mechanism of debonding between the reinforcement and concrete plays a key role in cracking.
Community structure, life histories and secondary production of stoneflies in two small mountain streams with different degree of forest cover
Authors: Beracko Pavel , Kušnírová Andrea , Partlová Michaela , Ciceková Jana
Published: October 2015

Our study examines community structure and nymphal biology (life cycles and secondary production) of stoneflies in two adjacent mountain streams with different degree of forest cover in the Prosiečanka River Basin (Chočské Vrchy Mts., West Carpathians). One of the streams has non-forested catchment, converted to meadows and pastures, while the other one has catchment with 60% covered by spruce forest. Differences in forest cover and in thermal regime of the streams were reflected by the difference of stonefly communities at their structural and functional level. Species Nemoura cinerea and Leuctra aurita created stonefly assemblage in non-forested stream, whereas Nemoura cinerea also occurred in naturally forested stream together with species Leuctra armata, Leuctra nigra, Leuctra prima, Siphonoperla neglecta and Arcynopteryx dichroa. All examined species had maximally annual life cycle and in eudominant species Nemoura cinerea one month shift was found in nymphal hatching and adult emergence between streams. Total secondary production of stoneflies in undisturbed stream (126.46 mg DW m-2 y-1) was more than two times higher than the production in non-forested stream (47.39 mg DW m-2 y-1). 
Language and communication development in preschool children with visual impairment: A systematic review
Authors: Mosca Renata , Kritzinger Alta , Van der Linde Jeannie
Published: October 2015

Background: Language and communication difficulties of young children with visual impairment (VI) are ascribed to intellectual disability, multiple disabilities and autism spectrum disorder (ASD) rather than their sensory impairment. Consequently, the communication difficulties of children with VI may have been underestimated and undertreated. Objectives: This report aims to critically appraise recent peer reviewed literature relating to communication and language development in children with VI. Method: A systematic search of the literature (2003–2013) was completed using the PRISMA guidelines, and primary and secondary search phrases. Nine publications were reviewed in terms of the strength of recent evidence. Thematic analysis was used to describe the early language and communication characteristics of children with VI. Results: All the selected articles (n = 9) were from developed countries and participants from seven of the studies had congenital VI. Five of the studies received an evidence level rating of III while four articles were rated as IIb. Two main themes emerged from the studies: early intervention, and multiple disabilities and ASD. Language and communication development is affected by VI, especially in the early stages of development. Speech-language therapists should therefore be included in early intervention for children with VI. Conclusion: Recent evidence on the early language and communication difficulties of children with VI exists, but children in developing countries with acquired VI appear to not be investigated. The identified language and communication developmental characteristics may assist speech-language therapists to build a knowledge base for participation in early intervention for young children with VI and their families.
Biomarkers of Angiogenesis in Colorectal Cancer
Authors: Mousa Luay , Salem Mohamed E. , Mikhail Sameh
Published: October 2015

Colorectal cancer (CRC) is the third most common cancer worldwide and accounts for 10% of all new cancer diagnoses. Angiogenesis is a tightly regulated process that is mediated by a group of angiogenic factors such as vascular endothelial growth factor and its receptors. Given the widespread use of antiangiogenic agents in CRC, there has been considerable interest in the development of methods to identify novel markers that can predict outcome in the treatment of this disease with angiogenesis inhibitors. Multiple biomarkers are in various phases of development and include tissue, serum, and imaging biomarkers. The complexity of the angiogenesis pathway and the overlap between the various angiogenic factors present a significant challenge to biomarker discovery. In our review, we discuss the angiogenesis pathway and the most promising evolving concepts in biomarker discovery, as well as highlight the landmark studies that identify subgroups of patients with CRC who may preferentially benefit from angiogenesis inhibitors.
Screening of Transcription Factors Involved in Fetal Hemoglobin Regulation Using Phylogenetic Footprinting
Authors: De Souza Carrocini Gisele Cristine , Venancio Larissa Paola Rodrigues , Bonini-Domingos Claudia Regina
Published: October 2015

Fetal hemoglobin (Hb F) is an important genetic modulator of the beta-hemoglobinopathies. The regulation of Hb F levels is influenced by transcription factors. We used phylogenetic footprinting to screen transcription factors that have binding sites in HBG1 and HBG2 genes’ noncoding regions in order to know the genetic determinants of the Hb F expression. Our analysis showed 354 conserved motifs in the noncoding regions of HBG1 gene and 231 motifs in the HBG2 gene between the analyzed species. Of these motifs, 13 showed relation to Hb F regulation: cell division cycle-5 (CDC5), myeloblastosis viral oncogene homolog (c-MYB), transcription factor CP2 (TFCP2), GATA binding protein 1 (GATA-1), GATA binding protein 2 (GATA-2), nuclear factor erythroid 2 (NF-E2), nuclear transcription factor Y (NF-Y), runt-related transcription factor 1 (RUNX-1), T-cell acute lymphocytic leukemia 1 (TAL-1), YY1 transcription factor (YY1), beta protein 1 (BP1), chicken ovalbumin upstream promoter-transcription factor II (COUP-TFII), and paired box 1 (PAX-1). The last three motifs were conserved only in the noncoding regions of the HBG1 gene. The understanding of genetic elements involved in the maintenance of high Hb F levels may provide new efficient therapeutic strategies in the beta-hemoglobinopathies treatment, promoting reduction in clinical complications of these genetic disorders.
Matevž Rudolf: »Ko beseda podobo najde: slovenska literatura in film v teoriji in praksi (1984–2012)«. Ljubljana, Slovenska kinoteka, 2013
Authors: Zorman Barbara
Published: October 2015

Knjiga Matevža Rudolfa z različnih vidikov osvetli razmerje slovenskega filma do literature v zadnjih treh desetletjih. V uvodu je dragocen pregled razvoja ameriškega in evropskega filma pod literarnim vplivom, ki je razdeljen v različna zgodovinska obdobja kinematografije; tako razvojno prikazuje narativizacijo filma v začetku 20. stoletja, pridobivanje prestiža z naslanjanjem na literaturo in gledališče, ključne premike, pogojene z evropskim modernizmom po koncu druge svetovne vojne, spremembe, ki so jih uvajali novovalovski režiserji kot suvereni avtorji filmskih stvaritev, prek globalizacije svetovne kinematografije do sodobnega filma, ki ga med drugim zaznamujejo vpliv računalniške tehnologije, studijske priredbe epske literature in franšize. Pregled Rudolf zaključuje z ugotovitvijo, da so filmske adaptacije še vedno izjemno priljubljene, vendar predvsem v domeni komercialnega filma.
Dragan Petrovec: »Nasilje pod masko«. Ljubljana, Sanje, 2015
Authors: Rijavec Klobučar Nataša
Published: October 2015

Esejistično napisano delo, ki sloni na bogatih primerih in osebnem razmišljanju ter izkušnjah avtorja, postavlja mnogo vprašanj različnim strokam. Profesor Petrovec, ki je v našem okolju poznan kot vrhunski strokovnjak na področju izvrševanja kazni, svojo raziskavo postavi v dialog s filozofskimi spoznanji Hannah Arendt o banalnosti zla in Žižkovimi razmišljanji o globalnem nasilju.
Tranzicijsko učenje kot del procesa migracije
Authors: Jejčič Petra
Published: October 2015

Migranti se z vsako migracijo tudi izkustveno učijo, vendar imamo o tem razmeroma malo raziskav. V procesu tranzicije se posamezniki srečajo s spremembami, ki privedejo do potrebe po transformiranju védenja, stališč, praks, vrednot. V predstavljeni raziskavi smo ugotavljali, kako se posamezniki ob izkušnji migracije učijo, katere strategije pri tem uporabljajo in ali lahko učenje ob migraciji analiziramo z modelom tranzicijskega učenja. Članek obravnava učenje skozi teoriji biografskega in tranzicijskega učenja. V empiričnem delu kvalitativne raziskave na podlagi polstrukturiranih intervjujev in sledeč narativni metodi ugotavljamo, kateri so glavni razlogi za selitev in katere strategije učenja ob tranziciji se pri migrantih pojavljajo. Odkrivamo, da se pri migrantih pojavljajo vse štiri temeljne strategije učenja po Wildemeerschu in Stroobantsovi (2009), tako strategija prilagoditve, rasti, razlikovanja kot tudi strategija upora, in da je model tranzicijskega učenja učinkovito analitično orodje za analizo izkustvenega učenja ob migraciji.
Empathy in Adult Education
Authors: Vrečer Natalija
Published: October 2015

Empathy is an important part of emotional intelligence and the latter is crucial for human relations, whether they be interpersonal relations, relations among people at work, or in a wider community. Therefore, empathy is important for adult education, for guidance counsellors, and for other adult educators. Adult educators must be empathic in order to understand the perspectives and needs of the participants in the educational process and empathy is a precondition for understanding. The development of empathy as a competence is a lifelong learning process. Namely, despite some biological predispositions for empathy, the latter can be learnt. It is the contention of the article that empathy is one of the most important intercultural competencies, because if a person is not empathic, other intercultural competencies vary rarely cannot develop to their full extent. Thus empathy is a precondition for successful intercultural dialogue.
Intervju z Eniso Murgić, udeleženko programa Začetna integracija priseljencev (ZIP)
Authors: Regina Maja
Published: October 2015

Intervju z Eniso Murgić, udeleženko programa Začetna integracija priseljencev (ZIP)
Projekt EDUKA – vzgajati k različnosti
Authors: Vidau Zaira , Bogatec Norina
Published: October 2015

Projekt EDUKA – vzgajati k različnosti