bluuebunny/crossref_metadata_2025 huggingface dataset:
A Multi-Agent Framework for Packet Routing in Wireless Sensor Networks
Authors: Ye Dayong , Zhang Minjie , Yang Yun
Published: April 2015

Wireless sensor networks (WSNs) have been widely investigated in recent years. One of the fundamental issues in WSNs is packet routing, because in many application domains, packets have to be routed from source nodes to destination nodes as soon and as energy efficiently as possible. To address this issue, a large number of routing approaches have been proposed. Although every existing routing approach has advantages, they also have some disadvantages. In this paper, a multi-agent framework is proposed that can assist existing routing approaches to improve their routing performance. This framework enables each sensor node to build a cooperative neighbour set based on past routing experience. Such cooperative neighbours, in turn, can help the sensor to effectively relay packets in the future. This framework is independent of existing routing approaches and can be used to assist many existing routing approaches. Simulation results demonstrate the good performance of this framework in terms of four metrics: average delivery latency, successful delivery ratio, number of live nodes and total sensing coverage.
Provable Fair Document Exchange Protocol with Transaction Privacy for E-Commerce
Authors: Hwang Ren-Junn , Lai Chih-Hua
Published: April 2015

Transaction privacy has attracted a lot of attention in the e-commerce. This study proposes an efficient and provable fair document exchange protocol with transaction privacy. Using the proposed protocol, any untrusted parties can fairly exchange documents without the assistance of online, trusted third parties. Moreover, a notary only notarizes each document once. The authorized document owner can exchange a notarized document with different parties repeatedly without disclosing the origin of the document or the identities of transaction participants. Security and performance analyses indicate that the proposed protocol not only provides strong fairness, non-repudiation of origin, non-repudiation of receipt, and message confidentiality, but also enhances forward secrecy, transaction privacy, and authorized exchange. The proposed protocol is more efficient than other works.
Links between Genetic Groups, Indole Alkaloid Profiles and Ecology within the Grass-Parasitic Claviceps purpurea Species Complex
Authors: Negård Mariell , Uhlig Silvio , Kauserud Håvard , Andersen Tom , Høiland Klaus , Vrålstad Trude
Published: April 2015

The grass parasitic fungus Claviceps purpurea sensu lato produces sclerotia with toxic indole alkaloids. It constitutes several genetic groups with divergent habitat preferences that recently were delimited into separate proposed species. We aimed to 1) analyze genetic variation of C. purpurea sensu lato in Norway, 2) characterize the associated indole alkaloid profiles, and 3) explore relationships between genetics, alkaloid chemistry and ecology. Approximately 600 sclerotia from 14 different grass species were subjected to various analyses including DNA sequencing and HPLC-MS. Molecular results, supported by chemical and ecological data, revealed one new genetic group (G4) in addition to two of the three known; G1 (C. purpurea sensu stricto) and G2 (C. humidiphila). G3 (C. spartinae) was not found. G4, which was apparently con-specific with the recently described C. arundinis sp. nov, was predominantly found in very wet habitats on Molinia caerulea and infrequently in saline habitats on Leymus arenarius. Its indole-diterpene profile resembled G2, while its ergot alkaloid profile differed from G2 in high amounts of ergosedmam. In contrast to G1, indole-diterpenes were consistently present in G2 and G4. Our study supports and complements the newly proposed species delimitation of the C. purpurea complex, but challenges some species characteristics including host spectrum, habitat preferences and sclerotial floating ability.
Print Media Liberalization and Electoral Coverage Bias in Kuwait
Authors: Selvik Kjetil , Nordenson Jon , Kebede Tewodros Aragie
Published: April 2015

The article discusses the political effect of print media liberalization in Kuwait based on content analysis of Arabic language newspapers in the 2009 parliamentary election. The analysis found no systematic favoring of pro-government candidates in electoral coverage, but did find a
statistically significant bias for candidates from the ruling, non-Bedouin hadari class, at the expense of the Bedouin tribal population. This article points to there being structural obstacles to democracy in Kuwait that cannot be overcome only by the liberalization of the press through
legislation.
Savoir et non-savoir dans le trauma psychique massif
Authors: Laub Dori , Auerhahn Nanette C.
Published: April 2015

Il est dans la nature du trauma de se dérober au savoir. Un trauma massif ne peut être saisi parce qu’il n’y a ni mots ni catégories de pensée adéquats pour sa représentation ; la connaissance du trauma est aussi farouchement défendue, car elle constitue une menace considérable à l’intégrité psychique. Mais le savoir se produit néanmoins à un certain niveau, souvent sous des formes restrictives ou défensives. Des exemples tirés de la clinique et des témoignages sont donnés pour chacun des niveaux de savoir décrits, et les implications pour la stratégie thérapeutique sont discutées.
Le cercle vide : les enfants de survivants et les limites de la reconstruction
Authors: Laub Dori
Published: April 2015

Le cercle vide symbolise l’absence de représentation, la rupture du self et l’absence de souvenirs qui sont au cœur de l’héritage d’un trauma psychique massif. Un fragment étendu d’une analyse illustrera comment ce vide se perpétue dans la vie d’enfants de survivants à l’Holocauste. Les modèles de conflit du développement n’expliquent pas la puissance de ses effets. La reconnaissance, l’acceptation de la réalité de cette absence dans le cœur du trauma peuvent créer l’espace de la prise de conscience de leurs difficultés à l’égard des vécus traumatiques de leurs parents.
Si la loi HPST m’était contée...
Authors: Grimaldi André
Published: April 2015

Le volet hospitalier de la loi « Hôpital, patients, santé, territoires » (HPST) a mis en place la « gouvernance d’entreprise ». L’objectif n’était plus la règle éthique du juste soin pour le patient au moindre coût pour la collectivité mais la recherche de la rentabilité avec l’« optimisation du codage », c’est-à-dire l’augmentation de la facture de la sécurité sociale. Cette politique libérale s’est effectuée en renforçant le pouvoir de l’État par l’intermédiaire des directeurs d’ARS, véritables préfets sanitaires nommés par le gouvernement et révocables à chaque conseil des ministres. Ce tournant bureaucratico-libéral provoqua pour la première fois dans l’histoire hospitalière une grande manifestation unitaire du personnel de l’AP-HP rassemblant toutes ses composantes à l’appel du Mouvement de défense de l’hôpital public (MDHP) qui, transcendant les clivages politiques et syndicaux, défendit une conception de la santé comme bien commun financé par la solidarité – commun mais forcément limité et donc précieux, dont le gaspillage est inutilement coûteux et avant tout non éthique.
Les conséquences électorales des conflits de la santé : mythe ou réalité ?
Authors: Pierru Frédéric
Published: April 2015

Le sociologue, lorsqu’il interroge les protagonistes de la politique de santé, ne peut qu’être frappé par l’invocation rituelle de lieux communs comme celui du pouvoir de nuisance électorale de la profession médicale. Certains, plutôt les acteurs politiques, considèrent un tel pouvoir comme avéré, se remémorant les supposées conséquences politiques de conflits majeurs dans le secteur de la santé. D’autres, plutôt les journalistes et les experts, semblent davantage marquer leur distance à l’endroit de ce qui apparaîtrait d’abord comme un mythe inhibant la capacité d’action des pouvoirs publics. Même s’il est avant tout un « chasseur de mythes », le sociologue doit prendre au sérieux la persistance de croyances plus ou moins investies par les acteurs des politiques de santé. Comme l’ont enseigné Mircea Eliade et Paul Veyne, les mythes, loin d’être des illusions ou des fables, doivent être pris au sérieux, même dans nos sociétés sécularisées. Toute action publique revêt en effet une portée symbolique, sinon mythique. C’est encore plus vrai dans ce secteur axiologiquement et émotionnellement dense qu’est la santé.
Penser la métropole avec le genre
Authors: Louargant Sophie
Published: April 2015

Les questions urbaines et territoriales n’offrent pas assez régulièrement la place au débat sur les approches de genre. Usuellement associée à un débat sociétal, la question du genre n’aurait donc pas sa place dans la conceptualisation du fait urbain et métropolitain, du moins dans la conception hexagonale à la fois réflexive et opérationnelle des politiques territoriales et urbaines. La manière dont « on prend place », dont on est autorisé à prendre cette « place » dans les formes d’urbanités contemporaines montre que les questions de genre s’inscrivent dans l’histoire des luttes urbaines sociales, mais aussi dans une action publique contemporaine portée par les idéologies du bien-être urbain, de l’écologie urbaine. Cet article retrace les effets concomitants des utopies féministes et écologistes dans le champ actuel de la conception urbaine. L’analyse des usages des espaces de nature dans l’agglomération de Grenoble explicite les effets de la conception androcentrée et hétéronormative des espaces de nature à la fois sur les usages, les représentations et la gestion de ces sites.
18-FDG Uptake in Pulmonary Dirofilariasis
Authors: Stone Michael , Dalal Ishani , Stone Chad , Dalal Bhavin
Published: April 2015

Solitary pulmonary nodules are a common finding on chest radiography and CT. We present the case of an asymptomatic 59-year-old male found to have a 13 mm left upper lobe nodule on CT scan.  The patient was asymptomatic and the CT was performed to follow up mediastinal and hilar lymphadenopathy that had been stable on several previous CT scans.  He had a history of emphysema and reported a 15 pack-year smoking history.  PET-CT was performed which demonstrated mild 18-FDG uptake within the nodule. Given his age and smoking history, malignancy was a consideration and he underwent a wedge resection.  Pathological examination revealed a necrobiotic granulomatous nodule with a central thrombosed artery containing a parasitic worm with internal longitudinal ridges and abundant somatic muscle, consistent with pulmonary dirofilariasis. Dirofilaria immitis, commonly known as the canine heartworm, rarely affects humans.  On occasion it can be transmitted to a human host by a mosquito bite.  There are two major clinical syndromes in humans: pulmonary dirofilariasis and subcutaneous dirofilariasis.  In the pulmonary form, the injected larvae die before becoming fully mature and become lodged in the pulmonary arteries.
Healthinfo Engineering: Technology Perspectives from Evidence-Based mHealth Study in WE-CARE Project
Authors: Huang Anpeng , Xie Linzhen
Published: April 2015

Driven by the commission to proliferate information and communication technologies to health services globally, a new multidisciplinary direction is born, which can be named as Health Information (termed as a new word, Healthinfo) Engineering. To highlight the significances of Healthinfo Engineering, the evidence-based mHealth study in the WE-CARE project demonstrates technology perspectives. In this project, the authors built up a WE-CARE system, which integrate various necessary information and communication technologies to fulfill online healthcare services, even including advances from related math/modelling, physics sciences, etc. Without any doubt, such a system is a promising tool to change healthcare delivery. But this project also reveals there are many explicit and implicit factors left when using system-level integration in order to perform healthinfo applications. In general, in contrast to an explicit factor, an implicit factor is hidden from practical applications, which is the critical risk that may break down a healthinfo system. This phenomenon motivates us to investigate what's real bottlenecks in healthinfo systems. Based on the motivation, this paper summarizes healthinfo challenges from evidence study in the WE-CARE project, for instance, scheduling strategy, system light-loading, virtual clinical perception, privacy protection, etc. This technology summary shows that more extensive attention should be needed for healthinfo study not only in mobile and medical areas, and also in computer science, maths, physics, even including ethic, law, etc. In return, the new interdisciplinary cutting-edge science, Healthinfo Engineering, can make contributions to offer a practical life-cycle health management for all human being, including cancer supportive care.
Suitability of Adaptive Self-Regulated e-Learning to Vocational Training
Authors: Dimache Aurora , Roche Thomas , Kopeinik Simone , Winter Lisa Christina , Nussbaumer Alexander , Albert Dietrich
Published: April 2015

Many studies have been conducted, mainly in a university environment, and researchers have identified both advantages and disadvantages of e-learning. Very little is known about the applicability and suitability of e-learning to vocational and skills-based training. The research presented in this paper evaluates an adaptive e-learning model (INNOVRET) which combines skills-based learning by means of the Competence based Knowledge Space Theory (CbKST) with the principles of self-regulated learning (SRL) for a practically-oriented vocational training area, namely highly skilled heat pump system installation, in Ireland. The research methodology employed to carry out this study consists of a participative study to develop the INNOVRET approach for e-learning for heat pump systems installation and an empirical study carried out to evaluate the INNOVRET system. The results show that it is the IT skills of the installers that determine the way they perceive the system and the whole learning experience, as well as the level of knowledge acquired.
Collaborating Online
Authors: Oh Eunjung Grace , Reeves Thomas C.
Published: April 2015

The paper introduces a logic model of online collaborative group work for adult learners. This logic model was developed through a literature review in the context of a multi-year educational design research study aimed at optimizing the online group work experience of adult learners. The model is intended to guide online instructors at post-secondary levels who aspire to develop and teach online courses using collaborative group work and authentic complex learning tasks as primary pedagogies. The paper describes each component of the model such as the goals of collaborative group work, attributes of different groups, and various factors influencing effective group work.
What and Where are the Risks of International Terrorist Attacks
Authors: Strang Kenneth David , Alamieyeseigha Serafina
Published: April 2015

There seems to be a great deal of attention in the media given to global terrorism but the authors do not know what and where the actual risks are. Western countries such as Australia, UK, and USA have invested a great amount of financial resources to combat global terrorism yet there is a concern the investments outweigh the risk. Furthermore, there are some people who question the reality of global terrorism. To explore these issues, this study analyzes the global terrorism empirical evidence from 1970 to 2013 (2014 was still in progress). The goal was to describe the global terrorist behavior factors and patterns from a socio-economical perspective, to identify who the terrorist groups are, what they do, and where they attack. Interesting descriptive statistics and insights were provided to help practitioners understand how global terrorism impacts us and to motive more empirical into this important topic.
Diffusion and Mechanical Stresses in a Material with Two-Component Coating at External Heating
Authors: Chepak-Gizbrekht Marija V. , Knyazeva Anna G.
Published: April 2015

Multilayer materials and materials with coatings are widely used in various applications. In studies of properties of new materials are run into poorly explored occurrences quite often. In such occurrences are among thermal diffusion (Soret effect) in solid materials. At this paper presented the model of formation of diffusion zone between two-component coating and base at the condition of heat flux action. Model completed of mechanical equilibrium problem. It was formulated the analytical solution of problem, which are applicable for concentration redistribution calculations and also for stresses and deformations in diffusion zone.
Influence of Chip Formation Characteristics on Flank Contact Load Distribution in Titanium Alloy Cutting
Authors: Kozlov Victor , Li Xu
Published: April 2015

In this paper different contact conditions between tool, chip and work material are analyzed. Experimental and theoretical studies of contact load distribution on the artificial flank wear land of the cutter in free orthogonal turning of a disk made from titanium alloy (Ti-6Al-2Mo-2Cr) are described. Investigations of cutting with various feed rate and cutting speed show that the greatest contact loads are observed immediately at the cutting edge. It is associated with the discontinuous character of titanium alloy chip and the elastic recovery of the transient (machined) surface at the moment when generated chip element is separated. The main influence of the variable chip thickness ratio of the discontinuous chip on the value of the greatest normal contact load near the cutting edge is shown that confirms the author’ hypothesis about a sag of the transient surface in the cutting edge region.Abbreviation and symbols: m/s – meter per second (cutting speed v); mm/r – millimeter per revolution (feed rate f); MPa – mega Pascal (specific contact load as stress σ or τ); hf– the width of the flank wear land of the cutting tool, flank wear land can be natural or artificial like in this paper [mm]; xh– distance from the cutting edge on the surface of the flank wear land [mm]; σh– normal specific contact load on the flank land [MPa]; τh– shear (tangential) specific contact load on the flank land [MPa]; HSS – high speed steel (material of cutting tool); Py r– radial component of cutting force on the rake face [N]; Pz– tangential component of cutting force [N]; γ – rake angle of the cutting tool [°]; α – clearance angle of the sharp cutting tool [°]; αh– clearance angle of the flank wear land [°]; b – width of a machined plate or disk [mm]; a – the thickness of the layer being removed (uncut chip thickness) [mm]; a1– chip thickness [mm]; Ka– chip thickness ratio (Ka= a1/a) as a degree of plastic deformation in chip formation zone; Ka2– variable chip thickness ratio, Ka2= a2/a1, where а2– distance from the rake face surface of the chip to the contact point of two neighbouring elements of the chip [mm]; Φ – shear angle [°]; hd– value, which determines the depth of deformation, for an ordinary task it is equal to the thickness of the machined part or the radius r of the machined disk [mm]; q – intensity of loading in the chip formation region [MPa].
Specifics of Welded Joint Destruction Obtained by Friction Stir Welding at Strain
Authors: Kolubaev Evgeny , Sizova Olga , Zaikina Anastasiya , Levihina Anastasiya
Published: April 2015

The specifics of fracture of weld seam samples of aluminium-magnesium alloy, obtained by the friction stir welding (FSW) method at strain, have been studied. It has been shown that the weld seam contains aluminium-oxides, which are located on the surface of the conjugation of two sample parts. This imperfection leads to the effect when the initial crack spreads from the seam root over this surface of conjugation. The subsequent fracture proceeds over the basic metal of the seam.
Influence of Layer-by-Layer Laser Sintering Modes on the Roughness and Thickness of Sintered Layer of Copper Powder
Authors: Saprykina N.A. , Saprykin A.A. , Emelyanenko S.M.
Published: April 2015

Quality improvement problem has been considered for a laser sintered surface layer. Purposely built experimental setup was described together with a four-factor experiment design on laser sintering PMS-1 copper powder. A mathematical model describing the effect of laser sintering process parameters on the surface roughness has been proposed. Practical recommendation for improving the quality of the surface layer is given.
Formation of Gradient Multiphase Nanostructured Surface Layers Using the Electron-Ion-Plasma Combined Method
Authors: Ivanov Yuriy F. , Teresov Anton D. , Ivanova Olga V. , Gromov Victor E. , Budovskikh Evgeniy A. , Klopotov Anatoliy
Published: April 2015

The data of the study of the elemental and phase composition, the condition of the defect substructure, mechanical and tribological characteristics of titanium alloy VT6 subjected to electroexplosive carburization with a sample of titanium diboride powder and the subsequent treatment by high-intensity pulsed electron beam is presented. It has been established that the main mechanisms responsible for an increase in the mechanical and tribological properties of the material are solid, dispersion, and grain boundary.
Production Tribological Behavior Feature of Metallic Nanoparticle Additives
Authors: Belyaev Sergey A. , Martyushev N.V. , Belyaeva Irina V.
Published: April 2015

Today an application of metal nanoparticles as additives to base oils is widely studied in tribological centers in many countries. The additives containing nanoparticles essentially raise the wear resistance ability of lubricants and reduce the friction coefficient. However, such lubricants are still not widely used. This paper gives a brief analysis of the problem.
Structure and Properties of Multicomponent Tin Leaded Bronzes upon Die-Casting Depending on Pouring Temperature
Authors: Korchmit Anton Viktorovich , Martyushev N.V. , Tarasov Sergei Yu. , Kvashnina Olga S.
Published: April 2015

This work presents the characteristic properties of powdered materials sintering under conditions of liquid-phase sintering. It has been established that to implement the liquid-phase sintering advantages it is necessary to do temperature research when the liquid-phase concentration does not exceed the critical one. The implementation of this condition provides the sintering temperature reduction by 150 – 200 °С.
Structure and Properties of Multicomponent Bronze Depending on the Crystallization Conditions
Authors: Korchmit Anton Viktorovich , Martyushev N.V.
Published: April 2015

This work presents the characteristic properties of powdered materials sintering under conditions of liquid-phase sintering. It has been established that to implement the liquid-phase sintering advantages it is necessary to do temperature research when the liquid-phase concentration does not exceed the critical one. Impact strength is the highest for the bronze, casted in a chill mould at 1220°С, and the lowest for the bronze, casted in aluminum-chromium-phosphate moulds at the same temperature.
Mechanical Properties of Spun Castings of Multicomponent Bronze Depending on the Casting Conditions
Authors: Korchmit Anton Viktorovich , Martyushev Nikita V.
Published: April 2015

The paper is devoted to the study of the multicomponent lead-tin bronzes. The data on the influence of rotational velocity of a casting mould and the temperature of melt pouring on the structure and mechanical properties are presented in the article. The results of mechanical tests and studies of the microstructure allowed determining the optimal conditions of obtaining the castings with high strength characteristics. The conducted researches show that the maximum values of strength (σV=280–290 MPa) and impact strength (КС=2.7–3.2 KJ/cm2) are provided at the pouring temperature of 1150–1200 ̊С and rotational velocity of a casting mould equal to 1200 rpm.
Low-Melting Glass-Ceramic Composites with Low Linear Thermal Expansion Coefficient for Radio-Electronics
Authors: Pogrebenkov Valeriy M. , Kostikov Kirill S. , Sudarev E.A. , Elistratova A.V. , Kamyshnaya Ksenia S. , Kolesova T.V.
Published: April 2015

Glass-ceramic composite materials based on lead-borate glass and eucryptite – a compound with a negative coefficient of linear thermal expansion (CTE), along with the conditions for their production are studied in this paper. Effects of the amount and granulometric composition of the eucryptite as well as time/temperature processing conditions on the change of the linear thermal expansion coefficient of the sintered samples are also examined.
Experimental Study of Forest Fuel Ignition by the Source of Limited Energy Capacity
Authors: Baranovskiy Nikolai , Zakharevich Arkadiy
Published: April 2015

During the experimental study we examined the ignition of the litter of hardwood species by the particle heated up to high temperatures. Our study involved conducting tests, using a carbonic particle and samples of typical forest fuels, formed of birch leaves. We determined a mechanism for litter ignition by a local heating source, and obtained the dependence of ignition delay of birch leaves on the particle's initial temperature.
Finite Element Modeling of Delamination Propagation in Composite Laminates
Authors: Skvortsov Yu.V. , Chernyakin S.A. , Glushkov S.V. , Perov S.N.
Published: April 2015

A new efficient modeling technique is proposed to study delamination propagation in thin-walled composite structures. This technique is based on interaction of layers-shells and utilizes ANSYS® software package. The methodology has been tested on DCB, ENF and MMB configurations.
Numerical Analysis of Inverse Problems for the Model of Transfer of Industrial Environmental Pollution in the Machine-Building
Authors: Soboleva O.V. , Mashkov Denis V.
Published: April 2015

The model of transfer of polluting substance is considered. inverse extremum problem of identification of the coefficients in an elliptic diffusion-reaction equation is formulated. The solvability of this problem is proved, the application of Lagrange principle is justified and the optimality system is constructed for specific cost functional. The numerical algorithm based on Newton-method of nonlinear optimization of linear elliptic problems is developed and programmed on computer. The results of numerical experiments are discussed
Calculation of Effective Coefficient of Thermal Expansion for Composite ‘Glass-Eucryptite’ Changing during Sintering
Authors: Knyazeva Anna G. , Kryukova Olga N. , Kostikov Kirill S.
Published: April 2015

In this work, thermal expansion coefficient of composite is calculated on the base of the model transient zone formation between spherical inclusion and matrix. Effective properties of particle surrounded by transient zone are used when composite properties are calculated. Different models leads to qualitative results similar to each other. Quantitative results depend on sintering temperature and time, on inclusion sizes and volume part of inclusions.
An Improvement of the Concept Design Analysis Method by the Use of the Avoidance Function
Authors: Khamukhin Alexander A. , Eres Murat H.
Published: April 2015

Avoiding disasters due to resonance is a major concern in construction projects such as buildings, bridges and pipelines. This paper uses the Concept Design Analysis (CODA) method that is capable of supporting the described Value-Driven Design (VDD) methodology. While VDD promotes the use of a system wide ‘value’ function during conceptual design, the CODA method allows mapping customer needs into engineering characteristics in order to calculate a single normalized design metric. The CODA method employs three different merit functions: maximizing (more is better), minimizing (less is better), and optimizing (target is better). This paper proposes a new merit function called avoidance function that allows excluding a range of engineering characteristics, e.g. avoiding a range of resonant frequencies. An example of a simple CODA model for a bicycle wheel design selection with the proposed the avoidance function is presented.
Dependence of the Effective Diffusion Coefficient of a Matrix Composite on the Size of Inhomogeneities
Authors: Anisimova Maria , Sevostianov Igor
Published: April 2015

The present paper focuses on calculation of the effective diffusion coefficient of a matrix composite with spherical inclusions. We address the problem of the effective diffusion coefficient dependence on the size of the inhomogeneities. In this work, the basic idea of replacing an inhomogeneous inclusion by an equivalent homogeneous one is formulated. The diffusivity contribution tensor, that characterizes the inclusion’s contribution to the overall process of diffusion, is derived in the course of analysis. It is shown that the effect of the interphase reduces the “apparent” volume fraction of inclusions. The thickness of the interphase zone is identified as the parameter of dominant importance among all the characteristics of the interphase.
Influence of Method Used for Calculating of Effective Properties on Stressed-Strain State of Composite Plate under Nonstationary Heating
Authors: Chumakov Yurii Aleksansdrovich , Knyazeva Anna Georgievna
Published: April 2015

Numerical investigation of stressed-strain state composite plate is carried out for the conditions of one-axial loading and nonstationary heating. The state of plane stress was assumed. Various methods had been used for the calculation of effective properties: elastic constants and thermal expansion coefficient. The influence of the coupling between thermal and mechanical processes on temperature, stress and strains fields was investigated.
Mathematical Modelling of an Arch Tooth Surface as an Envelope
Authors: Shcherbakov N.R. , Bubenchikov А.M. , Kazakavitschyus S.M.
Published: April 2015

We consider a gear with parallel rotation axes of an input and output part (spur gear), the input part having so-called arch teeth. We found the equation of the surfaces family for the arch tooth, the envelope of which is the tooth surface of the output part. We obtained an analytical solution of the equation that results from the condition of enveloping, which allowed to record parametric equations of the envelope determining the tooth surfaces of the output part.
Model of Automatic Distribution of Topologically Related Objects to Layers in Navigation Systems
Authors: Eremeev S.V.
Published: April 2015

In article the problem of automatic distribution of spatial objects to layers is considered. The result of the distribution is multi-layered vector map. Hierarchical model of topological relations has been developed. It is the basis for implementation of objects distribution algorithms. The practical significance of the work is processing of spatial objects in navigation systems.
Attenuation of Acoustic Waves in Metal Barriers
Authors: Baganina A.E. , Paleev D.Y. , Kazantsev Anton A.
Published: April 2015

The paper presents numerical solution of the problem of acoustic waves attenuation in metal barriers. We investigated separately the plates from steel, lead or copper as metal barriers. The acoustic wave attenuation was compared after passing the barrier, depending on the quantity of plates of the particular barrier and the distance between them.
Numerical Investigation of Compression Wave Attenuation in Water Barriers
Authors: Baganina A.E. , Paleev D.Y. , Blaschuk Mikhail Yu.
Published: April 2015

The article presents the results of a numerical study of the compression wave attenuation (CW) in water barriers. The impact of barriers thickness, their quantity and concentration of water particles in the barrier have been analyzed in the process of CW attenuation.
Technical Diagnosis of Internal Combustion Engines in the Parameters of Vibration
Authors: Syrbakov A.P. , Korchuganova M.A.
Published: April 2015

Several ways of technical diagnostics have been researched. General aspects have been considered of the mechanism diagnostics by vibroacoustic signals. The assessment of the vibroacoustic engine diagnostics method is provided. On the basis of a laptop computer, a portable diagnostic complex has been elaborated for the pre-assessment of combustion engine mechanisms' condition using parameters of a vibroacoustic signal. For technical assessment of combustion engines a diagnostic scheme has been proposed for mechanical components by vibration parameters.
Mathematical Modeling of Pulsed Electric-Sintering Powders
Authors: Sorokova Svetlana N. , Knyazeva Anna G. , Pobol Alexsey , Goranskyi George
Published: April 2015

The mathematical model of pulsed electric-sintering powder compositions are suggested and investigated. The distribution temperature, density and speed and thickness the powder composition studied.
Determination of Effect of Salt Content in Cooling Liquid on the Result of Cable Capacitance per Unit Length Measurement
Authors: Grigoriev Michael , Vavilova G.V. , Starikova Nadezda S.
Published: April 2015

Capacitance per unit length and related wave resistance refer to the main characteristics of a number of cable products, such as communication cables, control cables or radio-frequency cables. The capacitance per unit length value is regulated by the standards for appropriate types of cables. This study describes the technical implementation of the electrical method of measuring of the capacitance per unit length of the electric cable directly on the production line. It is shown that the change in specific electrical conductivity of water, which a capacitance transducer is dipped into, has a significant impact on the outcome of in-process control of cable capacitance per unit length. A method of offset from the impact of this measurement on the control results is suggested.
Method of Control of Object Positioning System and Device Scheme
Authors: Kurgankin Viktor , Zamyatin Vladimir
Published: April 2015

The method of control system object positioning, wherein the control signals generating is based on the analysis of the direct action of the operator on the object. Object positioning system scheme is designed for realization of the proposed method. The procedure of object positioning is engineered.
Improvement of Algorithms for Automatic Gauge Control System of the Hot-Rolling Mill
Authors: Karandaev Alexander Sergeevich , Khramshin Vadim Rifhatovich , Andryushin Igor Yuryevich , Shubin Andrew Grigoryevich , Loginov Boris Mikhailovich
Published: April 2015

The paper studies issues of improvement of the automatic gauge control system (AGCS) in the continuous hot-strip train. The factors influencing longitudinal strip gauge deviations have been classified. It has been proved that Davy McKee AGCS installed at the 2,000 mill of OJSC Magnitogorsk Iron and Steel Works (OAO MMK) does not provide control accuracy factors required at the light gauge strip rolling. The paper considers the functional chart of the improved AGCS realizing algorithm of the dynamic gauge correction. Experimental studies confirm that the developed chart helps to decrease longitudinal strip gauge deviations and, hence – to improve the quality of the products.
Development of a Combined Algorithm for Request Distribution Using Multi-Objective Optimization Methods
Authors: Igumnov Artyom Olegovich , Sonkin Dmitry Mikhailovich , Khrul Sergey Anatolevich
Published: April 2015

This paper considers the problem of request distribution in a taxi company for workload optimization. A combined algorithm for request distribution using multi-objective optimization methods is offered.
Developing a Procedure for Technical Status Control of a Turbine Compressor Package Blades
Authors: Klochkov Yury , Papic Ljubisa , Vasilieva Irina , Gazizulina Albina
Published: April 2015

The article discusses the models of repair process of a turbine compressor package blades. The author determines the boundaries of the assured quality area considering mathematical model analysis and defect detection of rotor blades based on the results of natural vibration frequency measurements.
Object’s Border and Position Allocating in an X-Ray Image
Authors: Tsapko Irina Valeryevna , Vlasov Andrei Vladimirovich
Published: April 2015

This paper is concerned with an algorithm of determining a position of an object and its borders in an X-Ray image. The algorithm is based on a preliminary estimation of a histogram of given image. The information retrieved from estimation provides complementary parameters for further edge detection. As a result, this approach allows reducing the processing time. The future research and development of the algorithm will be aimed at object tracking in real-time systems.
Benchmark for FFT Libraries
Authors: Chilingaryan Suren , Shkarin Andrei , Shkarin Roman , Vogelgesang Matthias , Tsapko Sergey
Published: April 2015

There are various vendors of FFT libraries, but there is no software available for it automatic benchmarking on all available devices. In this article an application that allows easy measure the performance and precision of various FFT libraries on the available GPUs and CPUs is presented. This application has been used to find out the fastest FFT library for NVIDIA GTX TESLA and NVIDIA GTX TITAN. The obtained results shown that the best implementation is provided by cuFFT library developed by NVIDIA.
Application of Convolutional Neural Networks for Automatic Number Plate Recognition on Complex Background Images
Authors: Druki A.A. , Bolotova J.A. , Spitsyn V.G.
Published: April 2015

The relevance of this study is stipulated by the necessity of designing techniques, algorithms, and programs improving the efficiency of automatic number plate recognition (ANPR) on images with complex backgrounds.Purpose: The aim of this work is to improve the efficiency of automatic number plate recognition on images with complex backgrounds using methods, algorithms, and programs invariant to affine and projective transformations.Design/methodology: Such techniques as artificial intelligence, pattern identification and recognition, the theory of artificial neural networks (ANN), convolutional neural networks (CNN), evolutionary algorithms, mathematical modeling, the probability theory and mathematical statistics were applied via Visual Studio and MatLab software.Findings: The software is developed allowing the automatic number plate recognition on complex background images. The convolutional neural network comprising seven layers is suggested to identify the plate localization, i.e. finding and isolating the plate on the picture. The pixel intensity histogram-based algorithm was used for character segmentation or finding individual characters on the plates. The convolutional neural network comprising six layers is designed to recognize characters. The suggested software system allows automatic number plate recognition at large angles of inclinations and rather a high speed.
Use of Local Characteristics of Self-Similarity of Digital Images for Solving the Problems of Crack Detection
Authors: Zhiznyakov A.L. , Privezentsev D.G.
Published: April 2015

The task of analyzing digital images on the basis of local characteristics of self-similarity is considered in this article. The algorithm of forming fractal characteristics of images and the detection algorithm, which can be used to solve the problems of task detection, are described. The results of studying the possibility of distributing the self-similarity in the problems of crack-detection are given
Effect of Carbon Nanotubes and Hydroxypropyl Methylcellulose on the Mechanical Properties and Cracking Tendency of Alkali-Activated Slag
Authors: Rypák Peter , Topolář Libor , Rovnaník Pavel
Published: April 2015

Alkali-activated slag (AAS) is a material which has great potential for use in building industry. However, its major disadvantage is an increased shrinkage followed by formation of microcracks. The aim of this work was to investigate the influence of carbon nanotubes and hydroxypropyl methylcellulose on the mechanical properties and cracking tendency of alkali-activated slag material. The results showed that both admixtures have a positive effect on compressive as well as flexural strength. Impact-echo measurement revealed that both admixtures reduce cracking tendency and can retain water in the binder.
Effects of Aluminum Addition on Microstructural Characteristics in Modified Coated Nickel-Based Superalloy, GTD-111, by Arc Melting
Authors: Wangyao Panyawat , Meechoorit Arisa , Pattaraumpornchai Pattarin , Asavavisithchai Seksak
Published: April 2015

The nickel-based superalloys, grade GTD-111, were modified by aluminum addition by the mean of vacuum arc melting process, in order to improve microstructure and oxidation resistance at elevated temperatures. The arc melted GTD-111 specimens were added with aluminum of 1, 2 and 3 wt. %. All specimens were then performed with heat treatment, which consists of solution treatment for 6 h at various temperatures of 1125, 1145, 1165, 1185 and 1205°C. After that, all specimens were followed by precipitation aging at 845°C for 24 h. Finally, to evaluate the microstructural stability, the long-term heating at temperatures of 900 and 1000°C for 400 h were performed to the specimens. It was found that the most proper amount of aluminum addition was 1 wt.%, which provided reheat treated microstructures with high area fractions of γ′-precipitated particles, as well as uniformed distribution of cubic γ′-morphology. The most proper solutioning condition is also found at 1165°C for 6 h.
Preparation of LiMn2O4 Microstructure by Low Temperature Solid-State Reaction for Cathode Material
Authors: Purwaningsih Dyah , Roto Roto , Narsito Narsito , Sutrisno Hari
Published: April 2015

This study aims at investigating a better condition of calcination at different temperature to produce LiMn2O4 microstructure. In this study, cubic LiMn2O4 was synthesized using a low temperature solid-state reaction. We report, here, MnO2 nanorods synthesis by reflux and their chemical conversion to LiMn2O4. The compound was characterized by XRD and TEM. Further, the analysis of LiMn2O4 microstructure was carried out by Direct Method using winPLOTR package program and Diamond using XRD data. At low calcination temperature, Mn2O3 is present as an impurity, but it disappears along with the increase in calcination temperature. It is also found that solid state reaction at is 750oC give nanoLiMn2O4. The lattice parameters and cell volumes of LiMn2O4 increases with the increase in heating temperature.
Femtosecond Laser Pulses Operation in Crystal under High-Power Diode Pumping
Authors: Prasad Brij Mohan Kumar , Bawankan Amrit
Published: April 2015

We report on a diode laser which is used to pump directly the crystal with a semiconductor saturable absorber allows passive mode locking for the generation of pulses with an average power along with the broadband light by focusing on ultrashort laser pulses into crystal tungstate. The nonuniformity can lead to the crystal and bonding failure. Also model the thermal and structural properties at the various tempeartures to observe the beam quality. Extends the generated spectrum from the infrared to ultraviolet through the visible region, it consists of discrete spatially separated sidebands.
Quaternary Ammonium Modified Silica for Gold(III) Sorption
Authors: Ngatijo Ngatijo , Nuryono Nuryono , Narsito Narsito , Rusdiarso Bambang
Published: April 2015

In this research, effect of pH toward adsorption of gold (III) on silica modified with methyl quaternary ammonium (SMQA) has been investigated.Additionally, its application an effect of Cr2O42-on adsorbed [AuCl4]-and effect of pH were carried out and to determine by atomic adsorption spectrometry (AAS). The experimental condition was optimized in batch process to achieve the maximum efficiency. The result showed that optimum pH 5 for adsorption. The gold desorbed increasing before 30 minutes, there were before and after adsorbed gold due at the long distribution axis from transmission electron microscopy (TEM) image. The maximum capacity of SMQA obtained 169.98 mg/g.The R2 values indicate that the Langmuir isotherm fit the the experimental data better than the Freundlich at room temperature. The adsorption gold (III) ion with material SMQA was chemisorption and an effect of Cr2O42-to minimize sorption.
Degradation Mechanism of Glass/Polyester Composite Exposure to Acidic and Alkaline Solutions at Room Temperature
Authors: Nabila Belloul , Hassiba Hamadache , Benyahia Ali Ahmed , Sérier Aîcha
Published: April 2015

The aim of this work is the studyof the degradation mechanism of a glass fiber/unsaturated polyester (UP) composite immersed inacidic(H2SO4)and alkaline(NaOH)solutionslike establishing a relation between the chemical and the mechanical behaviors of this material. The gravimetric analyses showed a pseudo fickianbehavior for the samples immersed in H2SO4 and mass losses with a pseudo-stage of saturation as from 64 hours of immersion for the samples immersed in NaOH.The Fourier transform infrared analysis (FT-IR)of the UP resin revealed the presence of chemical degradation phenomenon (hydrolysis).Microscopic observations (SEM) confirmed the fibres/matrix interfacesdegradation. The effect of these degradations has been reflected one the mechanical properties of the materials.
Effect of Thermomechanical Treatment (TMT) on Hardness, Impact Toughness of Different Grades of Low Alloy Steels
Authors: Tash Mahmoud M. , Alkahtani Saleh A. , Abuhasel Khaled A.
Published: April 2015

The present study was undertaken to investigate the effect of thermo-mechanical treatment (TMT) on the mechanical behaviour of different grades of low alloy steels. The effect of hot forming (rolling) with different reduction ratios on the hardness and impact toughness properties will be studied. Correlations between different thermo-mechanical treatment parameters, hardness and impact toughness for different grades of low alloy steels were carried out. Different grades of Low alloy steels were selected for the present study. An extensive study will be carried out to investigate the effect of alloying additions and TMT parameters on the hardness and impact toughness of heat-treated low alloy steels. An understanding of the combined effect of TMT and heat treatment on the mechanical properties of the low alloy steels would help in selecting conditions required to achieve optimum mechanical properties and alloy high strength to weight ratio. The scope of the present work is therefore to study the effects of hot rolling reduction ratios on microstructure and mechanical properties of such alloys. By measuring hardness, impact toughness, strength and ductility resulting from different heat treatment following TMT, it is possible to determine which conditions yielded optimum mechanical properties and high strength to weight ratio.
Correlation between Alloying Elements and Aging Parameters and Hardness and Machinability of Aluminum-Silicon Alloys Using Minitab Software
Authors: Tash Mahmoud M. , Abuhasel Khaled A. , Alkahtani Saleh A.
Published: April 2015

The present study was undertaken to investigate the effect of alloying additions and aging parameters (time and temperature) on the hardness and machinability of Al-Si alloys. Hardness, drilling force and moment and number of holes drilled/tool measurements were carried out on specimens prepared from grain refined, Sr modified and heat treated Al-Si alloys. Aging treatments were carried out for the as solution treated (SHT) specimens (after quenching in warm water). The specimens were aged at different conditions; artificial aging was carried out at 180˚C, 200 ˚C and 220˚C for 2 and 5 h. Hardness, drilling force and moment and number of holes drilled/tool as a function of different metallurgical parameters (i.e. %Si content, %Mg content, heat treatment parameters (time and temperature), Cu-intermetallics surface fraction and Fe-intermetallic surface fractions) are analyzed to acquire an understanding of the effects of these variables and their interactions on the hardness and machinability of heat treated Al-Si alloys.