bluuebunny/crossref_metadata_2025 huggingface dataset:
Paradoxes de l'ordre et logiques fragmentaires : une province entre en guerre civile (Bretagne, 1589)
Authors: Hamon Philippe
Published: September 2014

Les conditions d’entrée de la Bretagne dans les guerres de la Ligue en 1589 sont originales, dans la mesure où la province s’est tenue jusque-là très largement à l’écart des guerres de Religion. Mais les logiques de ce processus ne lui sont pas forcément spécifiques. On constate en premier lieu que la volonté générale de défendre l’ordre local, aussi bien que la large nécessité sociale de l’engagement au service des communautés, se muent bien souvent en facteurs de clivage à une échelle plus large, contribuant ainsi à l’extension concrète du conflit dans la province. Ce premier paradoxe de l’ordre se double d’un second : en effet pour assurer l’ordre, une mobilisation populaire peut être requise, alors même que le peuple, une fois armé, est toujours soupçonné par les élites de songer à la subversion. Reste ensuite à comprendre sur quels critères se font les choix partisans. Certains des modèles explicatifs mis en avant, aussi bien sociaux que religieux, rendent mal compte de cette division. Il faut se tourner vers des rivalités héritées entre hommes de pouvoir ou entre villes, qui ne sont plus régulées par l’arbitrage et la faveur issus du roi. Opèrent alors les logiques segmentaires propres à la société du temps, qu’on peut qualifier de politiques mais qui n’ont généralement rien d’idéologique. La capacité militaire de contrôle des points d’appui et des espaces joue ensuite un rôle essentiel, d’autant que l’engagement armé, facteur de politisation, se diffuse largement. Ainsi les lo- giques qui se dégagent peuvent nourrir une réflexion plus large sur l’éclatement d’une guerre civile.
La guerre des ondes entre la France et l'Allemagne pendant la « drôle de guerre »
Authors: Fagot Maude
Published: September 2014

Alors que les opérations militaires entre la France et l’Allemagne n’ont pas encore pris l’ampleur qu’une déclaration de guerre est connue d’engendrer, un combat d’une autre nature fait rage. La guerre à laquelle se livre les deux pays se joue en effet dans le domaine de l’éther ; à travers les ondes radiophoniques. Les deux nations utilisent ce nouveau medium de masse qu’est la radiodiffusion pour atteindre la population, l’armée ennemie et tentent d’influencer son moral par le biais de mots, de slogans et d’arguments corrosifs. Alors que la supériorité de la propagande allemande est communément acceptée dans l’historiographie des deux pays, il est peu connu – mais n’en demeure pas moins vrai – que les autorités françaises se sont lancées dans cette bataille avec autant d’énergie. Les arguments de l’une et l’autre nations, bien que dissemblables, reposent sur des méthodes identiques de propagande, créant ainsi, dans le domaine de la propagande extérieure, des similitudes inhérentes à la période.
Design of Mine Ventilation Systems Based on Artificial Intelligence
Authors: Yin Xiao Yu , Xie Xian Ping , Li Zhen , Li Jian Gong , Wang Ting Jun , Tan Xing Yu , Su Mei Wei , Luo Wen Gui , Cui Chao
Published: September 2014

Expert systems, or knowledge based systems, are programs in which the answer to a user-posed question is reached by logical or plausible inference rather than strictly by calculation, although calculation routines can form a major part of an expert system. Based on the integration of expert system technology and optimization technology, an intelligent computer aided design method for mine ventilation systems is proposed in this paper. Firstly, the structure and control algorithm of the intelligent design system are explored. Secondly, the knowledge types required for the mine ventilation expert system and the acquiring method of knowledge are discussed. Finally, the inference method of this expert system is put forward.
Research on Vehicle Control Strategy Evaluation Method
Authors: Yan Yu Guang , Xu Hong Guo , Liu Hong Fei
Published: September 2014

Method of vehicle control strategy evaluation was proposed to evaluate vehicle control strategy. 3DOF nonlinear vehicle model was deduced and verified though vehicle test. Based on Lyapunov theorem and vehicle system characteristics, vehicle’s spatial stability region was given. Though the spatial stability region, control effect of vehicle with four wheel steering (FWS) and direct yaw moment control (DYC) strategies were respectively evaluated. Results show that the stability region defined by Lyapunov and system stability theorem has good effect on characterized vehicle stability and could be a valuable method for vehicle control strategy evaluation.
Research on 12V DC/DC Converter for Pure Electric Vehicles
Authors: Li Si , Wang Yan , Yin Tian Ming
Published: September 2014

As one of the important parts of PEV (Pure Electric Vehicles), the efficiency and power density of DC/DC converter are important indicators of its performance. The efficiency of hard-switching DC/DC converter is low, so it can’t meet the requirements of PEV. To overcome such kind of problems, a DC/DC converter of 12V-30A output for PEV with LLC half-bridge resonant circuit and synchronous rectification technology is presented in this paper. Firstly, the operational principle of LLC half-bridge resonant circuit is analyzed in detail. Then the parameters of resonant network are designed based on theoretical analysis and verified. Finally, an experimental prototype of 12V-30A output for PEV is built and the efficiency is over 90%. The experimental results and running performance in PEV of the presented DC/DC converter is good enough to replace the 12V Lead-acid battery, which has broad application prospects.
Frequency Meter with Equal Precision Based FPGA + MCU
Authors: Wang Peng , Yan Chang Jia , Niu Tong , Fang Xue , Jin Zhi Peng , Guan Bo Shi
Published: September 2014

Aiming at such disadvantages of traditional frequency measurement technology as low precision and small measurement range, the combination of FPGA and MCU is applied in this paper to realize equal precision frequency measurement. The system makes full use of advantages FPGA, which has high speed and multi-I/O port, and MCU which has good man-machine interface and flexible control function. By controlling the time of enable signal allowed frequency measurement equal to integer cycles of measured signal, the frequency measurement accuracy can keep constant in the whole measurement range. The frequency measurement range of meter is 0.1 Hz~ 50 MHz, and the accuracy of frequency measurement is 10-6 Hz. In addition to measuring frequency, the system also can detect the period, pulse width and duty ratio. The simulation and experimental results show that the frequency meter has such advantages as compact structure, small volume, high reliability and precision and wide frequency measurement range.
The Mean Value Theorem of a New Kind of Fuzzy Integral
Authors: You Cui Lian , Huo Huae
Published: September 2014

When calculating Liu integral, it is difficult to use the definition of Liu integral directly. As we know, the mean value theorem of integral is an important tool to calculate Riemann integral, inspired by this, the mean value theorem of a new kind of fuzzy integral was obtained in this paper.
Some Properties of Complex Fuzzy Process
Authors: You Cui Lian , Wang Wei Qing
Published: September 2014

A complex fuzzy process is a fundamental connection between two dimensional fuzzy processes. Some properties such as independence, calculation formulas of complex fuzzy processes are studied in this paper.
A New Sorted QR Decomposition and its Application in V-BLAST
Authors: Zhang Hong Wei , Qian Jiang
Published: September 2014

In this paper, we present a new efficient algorithm to detect the transmitted signals for V-BLAST system. This algorithm utilizes a new sorted QR decomposition of the channel matrix, where the diagonal elements of are obtained from bottom to top and each achieves its maximum value among all possibilities. It has a solid theoretical basis, meets the signal detection order, and each symbol value in the receiver site is as large as possible. Thus, the new algorithm clearly improves the signal detection performance compared with existing methods. Simulation results demonstrate that the proposed algorithm provides a better BER performance.
An Improvement Routing Protocol Based LEACH for Wireless Sensor Networks
Authors: Cao Jin Gang
Published: September 2014

Due to limited energy, computing ability, and memory of Wireless sensor Networks(WSN), routing issue is one of the key factors for WSN. LEACH is the first clustering routing protocol, which can efficiently reduce the energy consumption and prolong the lifetime of WSN, but it also has some disadvantage. This paper proposed an improvement based LEACH, called LEACH-T. According to different number of clusters, LEACH-T uses variable time slot for different clusters in steady-state phase, and single-hop or multi-hop to transmit data between cluster heads and Base Station. Also it considered residual energy of sensor nodes and the optimal number of clusters during selection of the cluster heads. The simulation results show that LEACH-T has better performance than LEACH for prolonging the lifetime and reducing the energy consumption.
Using Cross-Coupling Effects for Suppression of Contact Severity
Authors: Shang Zhi Yong , Shaymurat Talgar , Xu Li Jun
Published: September 2014

In this paper the influence of cross-coupling effects on the rubbing-related dynamics of rotor/stator systems is investigated. The model considered in this paper is a 4-dof rotor/stator system which takes into account the dynamics of the stator and the deformation on the contact surface as well as the cross-coupling effects. The stability of the synchronous full annular rub solution of the model is first analyzed. Then, the cross-coupling effects on the stability of the system at different system parameters are studied. It is found that the cross-coupling effects of the rotor stiffness as well as those of the stator damping and stiffness will benefit the synchronous full annular rubs while the cross-coupling damping of the rotor will reduced the stability domain of the response and lead the system to a response with a heavier rubbing
Research of Routing Protocol for Support Pressure Monitor in Mine Base on WSN
Authors: Zhang Wei , Zhao Liang
Published: September 2014

According to the advantages and disadvantages of LEACH and PEGASIS,we propose a LEACH-P protocol which cluster head is a improved and connected into a chain protocol.This protocol first choose cluster head in the wireless sensor networks and make all nodes into clusters.Then it top-down traversals cluster head and finds a link connection which optimizes cluster head election and inter-cluster communication. It is more adapted to the pressure monitoring system of downhole hydraulic support.NS2 simulation show that the improved protocol can extend the network life cycle and have a good real-time.
Research and Implementation of Collecting Ajax Dynamic Information
Authors: You Dan Mei , Wei Hui Qin
Published: September 2014

In the use of Ajax technology on web pages, it is needed to execute client-side Javascript code to present dynamic information. This will result in that a lot of useful data cannot be retrieved with search engine. This paper will introduce a method based on calling browser API and, add the preprocessing stage and put forward effective element specification before trigger the Ajax page events. Besides, several experiments are introduced to testify it’s feasibility and effectiveness.
Stability Analysis for a Single-Layer Reticulated Shell
Authors: Duan Jin , Cong Jun , Feng Guo Jun , Lin Bing
Published: September 2014

A stability analysis for a single-layer reticulated shell is presented in this paper. The structural buckling modes and critical loads are calculated first. A preliminary security examination is presented based on the results of linear buckling anasys. And then the load-carrying capacity of this structure would be calculated through the geometric nonlinear full-range analysis. Finally a conclusion is deduced that the stable bearing capacity of this structure has met the requirements of the specification.
Material Properties of a New PCD Made of Boron Doped Diamond Particles
Authors: Chen William , Iwai Manabu , Ninomiya Shinichi , Suzuki Kiyoshi
Published: September 2014

In order to cope with various problems associated with machining of PCD, development of a new PCD possessing excellent tool properties and good machinability at the same time has been demanded. From this point of view, the authors have developed a new PCD, “EC-PCD (Electrically Conductive PCD)”, composed of boron doped diamond particles in place of the standard non-conductive diamond. In this research, investigation into material properties of the newly developed EC-PCD is made. Through the tests, it was found that the boron doped diamond particles (the source material of the new PCD) had an electrical resistivity of 1.6×10-4Ω·m and the thermal conductivity after sintering was lower than that of the standard PCD. In addition, it was confirmed that the electrical conductivity of the source diamond particles of the EC-PCD had not been lost even under the condition of high temperature and high pressure during the manufacture. As a result of the heat test, EC-PCD’s high resistance to oxidation at high temperatures was confirmed showing no changes in the surface condition even at 675oC while the surface of the S-PCD was largely changed at the same temperature. One of the reasons for this is guessed to be that EC-PCD is hard to react with the cobalt contained as a catalyst metal. Further, it was found in the friction tests using a steel ball that the friction coefficient of the EC-PCD was 50% higher than that of S-PCD at the room temperature though it dropped by 10-30% at the temperature of 80oC.
Dynamic Friction Polishing of Diamond Utilizing High Reactive Metallic Tools
Authors: Chen William , Iwai Manabu , Suzuki Kiyoshi
Published: September 2014

The authors developed “Dynamic Friction Polishing (DF polishing) Method” utilizing a thermochemical reaction between a diamond workpiece and a metal. This method enables high efficiency abrasive-free polishing of single crystal and polycrystalline diamonds (PCD) by simply pressing them against a stainless steel (SUS304) disc rotating at a high peripheral speed (VS>2500m/min). In the authors’ previous paper, a top of the diamond test piece (0.6mm×0.6mm, (100) plane) was removed at a rate of 2.6mm/min (0.94mm3/min) under the polishing condition of sliding speed VS=4000m/min, loading pressure P=130MPa and polishing time t=10s. A bottleneck for practical use of this method is a high pressure over 100MPa required for pressing a diamond workpiece against a rotating stainless steel disc. In this paper, a high efficiency tool was manufactured by electro-spark deposition of highly reactive special metals on a base disc tool. Among various reactive metals Nb and W brought very high efficiency in the polishing of a single crystal diamond.
Simulations of Milling Process of Inconel 718 Alloy Based on Three Dimensional Finite Element Models
Authors: He Lin Jiang , Su Hong Hua , Xu Jiu Hua , Fu Jia Bao
Published: September 2014

Nickel-based alloy is known as one of the most difficult–to-machine materials and the milling process is one of the most common metal removal operations. Modeling and simulation of milling process have the potential for understanding the milling mechanism, improving cutting tool designs and selecting optimum conditions, especially in advanced applications such as high-speed milling. This paper presents a 3D coupled thermo-mechanical finite element model based on ABAQUS\Explicit for the simulation of Inconel 718 chip formation in metal cutting. In the simulations, a Lagrangian formulation with an explicit solution scheme and a penalty contact algorithm has been used. The material behavior is modeled with classical Johnson-cook plasticity constitutive model and dynamic failure criteria for element removal, coupled with adaptive meshing and mass scaling technology for limiting the calculation time. The milling tool is modeled in UG software according to the real tool geometry, and meshed as a rigid tool. In order to verify the accuracy of 3D simulation, results (cutting forces and cutting temperature) were compared with the experimental results under the same cutting conditions as the simulations. The results obtained indicate that the simulation methodology is capable of predicting the cutting forces and cutting temperature. It suggests that 3D finite element simulation model of cutting processes can be truly trusted.
Conditioning of Vitrified Bond CBN Grinding Wheels Using a Picosecond Laser
Authors: Zahedi Ali , Tawakoli Taghi , Akbari Javad , Azarhoushang Bahman
Published: September 2014

Laser ablation is a novel non-mechanical wheel preparation method for optimizing the treatment costs of superabrasive tools. In this study the thermal effects of picosecond laser radiation on CBN superabrasive grinding wheel surface is analytically and experimentally investigated. The analytical approach is intended to find threshold process parameters for selective ablation of cutting grains and bond material. It has been analytically and experimentally shown that, the extent of material degradation is defined by the maximum surface temperature induced by the laser radiation which is in turn defined by the laser beam energy. It is also suggested that, the depth of laser thermal effects is governed by the relative speed of the laser scanner with respect to the wheel surface.
The Influence of Amplitude on Grinding Force and Surface Roughness in Ultrasonic Assisted Grinding of K9 Glass
Authors: Zheng Fei Fei , Ma Fu Jian , Wang Yi Dan , Dong Zhi Gang , Kang Ren Ke
Published: September 2014

Ultrasonic assisted grinding (UAG) has been a promising solution for the machining of brittle materials. The vibration amplitude in UAG has significant influence on the machining process. In this paper, the experiments which apply UAG process on K9 glass were conducted to investigate the effect of amplitude upon grinding force and surface roughness. Theoretical calculation was done to explain the phenomenon observed and to analyze how vibration affects the grinding process. The conclusion is reached that the vibration amplitude should be cogitatively set to achieve better surface quality while realizing the reduction of the grinding force.
Study on the Shape Error in the Cylindrical Traverse Grinding of a Workpiece with High Aspect Ratio
Authors: Onishi Takashi , Kodani Takuya , Ohashi Kazuhito , Sakakura Moriaki , Tsukamoto Shinya
Published: September 2014

In cylindrical traverse grinding of a long workpiece with high aspect ratio, the shape accuracy of a workpiece worsens due to its low stiffness. In this study, the grinding force was measured during grinding process to calculate the elastic deformation of a workpiece caused by the normal grinding force. By comparing calculated elastic deformation with the measured shape error of ground workpiece, the cause for the shape error in case of grinding a long workpiece was investigated experimentally. From experimental results, it is confirmed that the main factor of the shape error of the long workpiece is its elastic deformation during grinding process.
Ultrasonic Vibration Assisted Grinding of Sintered Dental Zirconia Ceramics: An Experimental Study on Surface Roughness
Authors: Dong Song , Zheng Kan , Xiao Xing Zhi
Published: September 2014

Dental zirconia ceramics have been widely used in dental restorations due to their superior aesthetical and mechanical properties. Ultrasonic vibration assisted grinding (UVAG), as a novel effective machining process for hard and brittle materials, is introduced into directly machining sintered dental zirconia ceramics. This study is dedicated to investigating the influence of input variables (spindle speed, feedrate and cutting depth) on surface roughness during UVAG of sintered dental zirconia ceramics. The experiment is conducted through single-factor method, and the experimental results are statistically analyzed by One-Way ANOVA. Besides, the influence tendency of input variables on surface roughness is also obtained. The results indicate that the influence of spindle speed on surface roughness is highly significant. The value of surface roughness rises with the increase of spindle speed, feedrate, and cutting depth. Therefore, a better surface quality will be achieved with the combination of lower spindle speed, cutting depth and feedrate.
Proposal of Micro Removal Process with Pulsed Laser Irradiation Based on Form Generation Theorem
Authors: Sakamoto Haruhisa , Morioka Koji
Published: September 2014

In general, the form generation theorem of laser removal processes has not yet been established. The cause of this is that laser is a light source and has no tool shape as conventional machining tools. Therefore, its transcription characteristics could not be determined. In this paper, the application of the form generation theorem to laser removal process is examined experimentally. In order to establish the form generation theorem, first the “equivalent tool shape” of the focused beam is determined. To determine the equivalent tool shape, a groove is machined with the laser intensity just above the removal threshold of the work piece material. From the machining result, the cross-section of the groove is machined in to a V-shape. The V-shape is peculiar to the workpiece material, thus can be determined as equivalent tool shape of laser machining. The groove shape can be simulated numerically by considering the removal threshold and dependence of absorption characteristics to incidence angle. The numerical simulation and the experimental result were in good agreement. Based on the equivalent tool shape and the form generation theorem, a rectangular cross-section groove is experimented. As a result the groove was finished with a flat bottom having ruggedness like a saw-blade. This result indicates that the laser shaping based on the form generation theorem can be possible by laser irradiation with properly suppressed intensity.
MID Fabricated by Ultrasonic Processing
Authors: Schomburg Werner Karl , Li Ji , Liao Sijie , Gerhardy Christof , Sackmann Johannes
Published: September 2014

Electronic circuit boards have been fabricated in cycle times of a few seconds by ultrasonic fabrication. A stack of thermoplastic polymer foils with a copper layer, 20 μm in thickness, on top is transformed into a polymer carrier with separated conductor paths. This process is accomplished in cycle times of a few seconds and the required equipment is just a commercially available ultrasonic welding machine and a metal tool micro patterned, e.g., by milling.Since soldering is often not possible on a thermoplastic carrier, electronic components are joined to the conductor paths by ultrasonic welding. This is achieved by employing an anisotropic conductive foil containing metal particles providing the electrical contact normal to the foil and showing no conductivity in lateral direction. The anisotropic conductive foil also serves as glue between circuit board and electronic components.
Numerical Simulation of Severe Plastic Deformation of Titanium Specimens under Dynamic Channel Pressing
Authors: Krasnoveikin Vladimir A. , Skripnyak Vladimir , Kozulin Alexander A. , Senatova Olga
Published: September 2014

Deformation processes of the α-titanium specimens moving through the channels of the die for two loading schemes: equal channel angular pressing (ECAP) and channel pressing through the channel of variable form (CVF) are investigated. Schemes of dynamic pressing in case the block is extruded at high speed through the channel of the die due to the pressure of the punch or the pressure of powder gases were analyzed. The problem is solved by the smoothed particle hydrodynamics method (SPH) within the framework of elastoplastic continuum.
Production and Quality Assessment of Superelastic Ti-Nb-Based Alloys for Medical Application
Authors: Konopatsky Anton S. , Zhukova Yulia S. , Filonov Mikhail R.
Published: September 2014

Superelastic biocompatible metallic materials Ti-22Nb-6Zr and Ti-22Nb-3Ta-3Zr (at %) were produced. Vacuum arc remelting (VAR) with manual control allowed to produce high‑purity alloys. X-ray fluorescence spectrometry (XRF) results showed that one remelt was not enough to obtain homogeneous Ti-Nb-Ta-Zr ingot. Ti-Nb-Zr and Ti-Nb-Ta-Zr alloys were remelted 3 times and turned upside down after each remelting. Scanning electron microscopy (SEM) with micro X‑ray spectral analysis showed that chemical composition of the alloys coincided with nominal chemical composition. SEM results also showed that the alloys were mostly homogeneous. Recommendations for optimization of VAR in terms of producing high-purity homogeneous superelastic titanium alloys were elaborated.
Research of Electromagnetic Properties of Composite Materials on the Basis of MWNTs in Microwave Range
Authors: Suslyaev Valentine I. , Kuznetsov Vladimir L. , Moseenkov S.I. , Korovin Evgeniy Yu. , Krasnikov D.V.
Published: September 2014

In this paper electromagnetic properties of composite materials based on polymethylmethacrylate and multiwall carbon nanotubes (MWCNTs) are investigated. Carbon nanotubes are received with application of various types of catalysts and have various structural parameters. Calculation of dielectric permeability of the synthesised materials is carried out. Dependence of electromagnetic properties of composite materials on concentration and structure used multilayer carbon nanotubes is shown.
Technical and Economical Efficiency for Application of Nanomodified High-Strength Lightweight Concretes
Authors: Inozemtcev Alexandr  Sergeevich , Korolev Evgeniy Valerjevich
Published: September 2014

The development of construction technologies is impossible without the proper estimation of economical efficiency. Some results of technical and economical efficiency of the developed high-strength structural lightweight concretes are presented in the article. Overview concerning world practice of research and application of lightweight concrete composition are made. The main properties and advantages of developed energy efficient high-strength lightweight concretes are described. The method of calculation of economic efficiency of concrete by means of reduction of total construction weight and increasing of floors’ number is proposed. Dependence between efficiency, footprint of building and number of floors is presented. It is shown that economical calculation for developed material which is based only on the cost of the material itself does not allow to obtain adequate data concerning prospect and competitiveness of the material. The authors offer method of calculating the economic efficiency of the developed high-strength lightweight concrete which takes into account the technical properties of the new material. The results of the study showed that the application of high-strength lightweight concrete is more effective than traditional kinds of the concretes.
The Development of Photocatalytic Systems Entitled Titanium Dioxide Nanoparticles Attached to Polypropylene Fibrous Carrier for Freshwater Disinfection
Authors: Lysak Ilia A. , Lysak Galina V. , Malinovskaya Tatyana D. , Ruhov Anatoly S.
Published: September 2014

In the current article the use of nanoparticles of titanium dioxide is justified to be an active component of the photocatalytic materials. The relationship between composition, structure and bactericidal properties of titanium dioxide is also established. It is shown that the polypropylene carrier comprising on a surface of at least 2.1 ± 0.3 mg/g of titanium dioxide nanoparticles, where both phases of titanium dioxide such as rutile and anatase are presented, allows the antibacterial treatment of water with high efficiency and it can be used for water purification from microbial contamination.
Fractographic Regularities in Fatigue Failure of 17Mn1Si Steel
Authors: Maruschak Pavlo , Panin Sergey , Vlasov Ilya , Danyliuk Iryna , Bishchak Roman
Published: September 2014

Using the scanning electron microscopy data the main regularities of the fatigue crack propagation in the 17Mn1Si steel were studied. Based on fracture surface observation and analysis one can testify that the transition of the leading role of deformation and failure from the lower structural level to the higher one has the ordered pattern.
Effect of Thermomechanical Treatment on Superelasticity in Ni54Fe19Ga27 Single Crystals
Authors: Tagiltsev Anton , Timofeeva Ekaterina , Panchenko Elena , Chumlyakov Yuriy
Published: September 2014

In the present study the effects of thermomechanical treatment on the stress-induced martensitic transformation and superelasticity of [001]-oriented Ni54Fe19Ga27 (at.%) single crystals were investigated. It is shown that high-temperature superelasticity is observed up to 453 K in the as-grown Ni54Fe19Ga27 single crystals. Thermomechanical treatment result in increasing of the martensite yield stress, and so the SE interval, which is observed up to 523 K.
Determination of Au, Pb, Ni, Co in Silicate Rocs and Ores by Atomic Absorption Spectroscopy with Graphite Furnace
Authors: Kryazhov Andrey , Panova Svetlana , Pakrieva Ekaterina , Oskina Yulia A.
Published: September 2014

A method for determination of gold, lead, nickel, cobalt in a range of concentrations from mg/g to ng/g was developed. Method can be applied for determination of corresponding metals in ores, rocks and waste mining industry. Method consists of annealing, treatment with hydrofluoric acid and aqua regia followed by extraction (in the case of gold) di-n-octyl sulphide (DOS). Method was tested by certified reference material (8773-2006 РВ 3-8) and various rock samples Altai-Sayan folded area.
Electromagnetic Properties of W – Hexaferrites Composites with Magnetic Texture
Authors: Wagner Dmitry V. , Dotsenko Olga , Ulyanova Olga A.
Published: September 2014

In this article the possibility of production of composite materials with magnetic texture are discussed. For texturing of magnetic polymer materials the device was made. The W-type hexaferrites were synthesized using a standard ceramic technique. Magnetic materials with a texture based on barium ferrite were obtained. The electromagnetic properties of texture and non texture composites were measured in microwave. It was shown, that imaginary permeability of an isotropic sample 1.3 times more that sample with texture in a frequency range of 0.5 – 4 GHz.
Liquid Phase Petroleum Resin Oxidation by Systems Based on Hydrogen Peroxide
Authors: Kukurina Olga S. , Slavgorodskaya Olga I. , Ustimenko Yuliya P.
Published: September 2014

The possibility of aromatic petroleum resin liquidphase oxidation was investigated. The influence of various factors on the modification process and properties oxidized samples was studied. The optimal parameters of the oxidation processes with hydrogen peroxide using interphase catalysis mechanisms, with peracetic acid, and with the electrogenerated oxidants complex of peroxide nature.
Products of Reaction between Barium Chloride and Sodium Hyrdosilicates: Examination of Composition
Authors: Grishina Anna Nikolaevna , Korolev Evgeniy Valerjevich , Satyukov Anton Borisovich
Published: September 2014

One of the promising directions of quality improvement of building materials (based on various binders) is to use hydrosilicates of calcium and barium. In particular, it is known that the application of calcium hydrosilicates can improve the compression strength in two or three times; the fracture toughness can be increased in two times and more. Prospects of using barium hydrosilicates in cement systems are due to the similarity of the chemical composition (with calcium hydrosilicates) and advantages of barium cements compared to traditional cements. It is advisable to synthesize the barium hydrosilicates by means of low-temperature technology. To investigate the influence of the curing agent (barium chloride) to the properties of the reaction products in the present study the IR spectroscopy and differential scanning calorimetry (DSC) are used. Analysis of the results allowed to state that the main reaction product is a crystalline silicate phase. Reducing the amount of curing agent leads to an increase of the content of silicic acid. DSC results show that dehydration of barium hydrosilicates takes place in two stages. It is typical for systems BaO•SiO2•6H2O. Increasing the content of silicic acid is accompanied by an endothermic effect in temperature range of 120...130 °C. Joint analysis of the results of IR spectroscopy and DSC leads to the conclusion that there is a reaction of barium carbonate and silicic acid. In general case, reduction of the amount of the curing agent contributes to increase of content of the silica acid and barium carbonate. Therefore, it is advisable to use compositions prepared with reduced amount of BaCl2 in systems capable of interacting with the silica acid and forming the insoluble products.
Synthesis of Silica Gel with Surface Layer of Transition Metals 8-Oxyquinolinates for Gas Chromatography
Authors: Makarycheva Alexandra , Slizhov Yury G.
Published: September 2014

The modification of Silochrome C80 with copper(II), cobalt(II) and nickel(II) 8-oxyquinolinates complexes was carry out. The range of working temperatures, morphological structure, polarity and chromatographic properties of the obtained sorbents were investigated. New sorbents were used for analytical separation of ketone mixtures of normal and isomeric chain by gas chromatography.
Synthesis of Substituted Semicarbazone, Thiosemicarbazone and Aminoguanidine
Authors: Mukhametzhanova Samal K. , Shtrykova Victoria V. , Kuksenok Vera U.
Published: September 2014

A new simple, universal and highly-efficient method of substituted semicarbazone, thiosemicarbazone and aminoguanidine synthesis in the presence of I2 was developed. The method was used to obtain a range of products with the structures confirmed by 1H NMR Spectra.
Sorption of Rhodamine into Polymer Block Matrix
Authors: Gavrilenko Mikhail A. , Burmetieva Maria S. , Gavrilenko Nataliya A.
Published: September 2014

A method for the trace analysis of rhodamine with colorimetric measurements based on solid-phase extraction by transparent polymethacrylate matrix is described. The quantity of sorbed РММ reagent is proportional to intensity of its painting and it depends on conditions of modification: рН, concentration of the reagent in solution and durations of processing. The interactions between PMM and rhodamine were studied by solid-phase spectrophotometry under batch conditions. The kinetic profiles of sorption at different temperatures are similar. This suggests that the sorption mechanism is mainly due to the formation of an inclusion complex through host–guest interactions.
Dynamics of Diffusion and Mechanical Waves Interaction under Conditions of Metal Surface Treatment with Particle Fluxes
Authors: Parfenova E.S. , Knyazeva A.G. , Azhel Yu.P.
Published: September 2014

A coupled isothermal model at the initial stage of a solid body surface treatment with particle flux is presented in this paper. The model takes account of the interaction of two different scale processes: impurity diffusion and mechanical stress wave propagation. The transition to dimensionless variables is briefly described. The examples of the coupled problem solution illustrating the wave interaction under the action of one pulse and two successive pulses are given.
High Temperature Uranium Nitride Decomposition
Authors: Mikhalchik Vladimir V. , Tenishev Andrey V. , Baranov Vitaliy G. , Kuzmin Roman S.
Published: September 2014

Thermal stability of the sintered samples of uranium mononitride was investigated in high purity helium atmosphere at 1900° – 2300°С. Thermogravimetry analysis of samples showed that the weight loss in uranium nitride consists of two stages. On first stage decomposition of uranium mononitride and nitrogen release starts. On the second stage additional active evaporation of uranium metal happens. During heating of the samples, nitrogen was registered by mass spectrometry. Microstructure of the samples after high temperature tests showed irregularly distributed spherical particles of uranium metal.
Mathematical Modeling of Pulsed Electro Contact Sintering of Carbide Powder Composition
Authors: Sorokova S.N. , Knyazeva Anna G. , Pobol Alexsey , Goranskyi George
Published: September 2014

The mathematical model of pulsed electric contact sintering of carbide powder compositions are suggested and investigated. The distributions of temperature, density and thickness of the rate during sintering are determined
Investigation of Product Aluminum - Water Reaction
Authors: Shiyan Ludmila N. , Yavorovskii Nikolai A. , Pustovalov Alexei V. , Gryaznova Elena N.
Published: September 2014

The effect of the method of aluminum nanopowder production on the aluminum products with water reaction is described. It has been established that the interaction of aluminum nanopowder prepared by the electric wire explosion, the phase composition of the reaction products mainly consists of boehmite (AlOOH) and has a fibrous structure. Therefore, that boehmite (AlOOH) can be used for modification of polymer membranes. The modified membranes can be used as water treatment from the impurity of formed true solutions according to adsorptive mechanism, and from colloidal nanometer and micron particles according to the mechanism of mechanical separation of particles depending on sizes.
Surface Layer Composition Change under Irreversible Conditions of Particle Beam Action
Authors: Asfandyar Khan , Knyazeva Anna G.
Published: September 2014

The simple isothermal problem is formulated to describe the composition of surface layer change during particle beam action. The finiteness of relaxation time for mass flux is taken into account. The analytical solutions for some limiting cases are presented. Numerical solution of total problem is carried out. It is shown that concentration distributions for reactants and for reaction product depend on relation between various physical scales.
The Asymptotic Analysis of the Nonstationary Problem of Variable Shear Loading on the Boundary of an Incompressible Solid
Authors: Ragozina Victoria E. , Ivanova Yulia E.
Published: September 2014

The loading process, in which the shear action on the boundary plane changes both the intensity and direction, is considered by the example of a one-dimensional plane problem for non-linear elastic incompressible half-space. It is shown that the solution in the front region of the shock wave is determined by a nonlinear evolution equations system in the space regions where the nonlinearity of the medium becomes a significant factor. The general solution of the evolution system was obtained. The particular solution of the evolution system for one of the most simple boundary conditions was considered as an example.
Dynamic Substructures Analysis of Combined Systems "Foundation - Structure - Equipment - Pipelines"
Authors: Belostotsky Alexandr M. , Akimov Pavel A. , Potapenko Alexey L. , Vershinin Vladislav V. , Scherbina Sergey V.
Published: September 2014

The present paper is devoted to research and development of methods of advanced static and dynamic analysis of structures, based on application of flexible hierarchical substructure models “foundation – structure – equipment – pipelines”, implemented in certified software application packages, convenient for practical industrial use. Contemporary finite element software application packages (universal – ANSYS, ABAQUS – and self-engineered – STADYO, ASTRA-NOVA products) are used for justification of nuclear power facilities.
Passenger Transport System of a Trestle Type for City Electric Transport
Authors: Zhizhkina Irina E.
Published: September 2014

During the years of evolvement traditional modes of transport actually have depleted reserves intended for their further development. However, the growing population in major cities, massive migration, economic and social processes bring forward absolutely new passenger transportation requirements, which can’t be satisfied to the fullest extent nowadays, and in the nearest future they will serve as a powerful factor in its development. Fundamentally new technical solutions, which would tackle the whole complex of problems (security, a distance range, travel time, cost of transport; one-time investment, etc) more efficiently, are required. The use of separate track structures solves these problems most effectively.
Having analyzed various options of passenger transport complexes with separate track structures, the authors concluded that the track structure in the form of the elevated trestle of a pipeline type is the most rational for urban conditions.
Effect of Magnetic Field Configuration of Dual Magnetron on Carbon Based Films Properties
Authors: Yurjev Yuriy N. , Zaitcev Danil A. , Sidelev Dmitrii V , Tupikova Olga S.
Published: September 2014

The article reports on the influence of magnetic field (B field) configuration of dual magnetron on carbon based films properties. The films deposition was performed by means of magnetron sputtering of carbon targets in argon plasma at total pressure range (0.1-1.6 Pa). The carbon films aren’t composed of chemical impurities as measured by Auger electron spectroscopy (AES). The B field configurations affect to a greater extent on mechanical properties and don’t have weighty impact on deposition rates. For «mirror» B field, the films hardness (H) is a higher. The rise of Ar pressure results in a decrease H from 20 to 9 GPa. It is peculiar to a-C and ta-C films. The effect of B field configurations on elastic module (E) is shown in higher pressures.
Plasmodynamic Synthesis of Nanodispersed Silicon Carbide
Authors: Nikitin D.S. , Sivkov A.A. , Pak Alexander Y. , Rakhmatullin I.A.
Published: September 2014

The plasmodynamic synthesis was conducted in the electric hypervelocity pulse jet of carbon-silicon electric discharge plasma influenced on a copper target in an argon atmosphere. Some samples of a powder product with a high content of β-SiC were produced. The results of the experiments made at different levels of supplied energy were compared. It was shown that the sizes of crystals grew, when the energy of a plasma shot increased.
Change of Structure and Mechanical Properties of R6M5 Steel Surface Layer at Electrolytic-Plasma Nitriding
Authors: Skakov Mazhyn , Rakhadilov Bauyrzhan , Batyrbekov Erlan , Scheffler Michael
Published: September 2014

In the article changes in the structure and mechanical properties of R6M5 steel surface layer after electrolytic-plasma nitriding are shown. The optimal mode of electrolytic-plasma nitriding of R6M5 high-speed steel in electrolyte based on carbamide, which allows saturation of the surface with nitrogen from low-temperature plasma and get the modified layer of high hardness and wear-resistance. It is established, that after electrolytic-plasma nitriding reduced R6M5 steel wear rate and increases its resistance to abrasive wear. Perspectivity of use an electrolytic-plasma nitriding method to improve performance cutting tools made from R6M5 steel is shown.
Influence of Laser Beam Machining Strategy at SLS Synthesis
Authors: Ibragimov E.A. , Saprikin A.A. , Babakova E.V.
Published: September 2014

Recently, the world's evolving experimental design and research work on the creation of technological methods and systems of layered laser synthesis products of machine parts. These systems allow to accelerate the introduction of new technology at all stages of product design to create its original layout in full size. There are currently variety of methods sintering of metal powders.This paper presents experimental data which show the effects of the strategy of forming a sintered layer in the synthesis of products by SLS.
Influence of Layer-by-Layer Laser Sintering Modes on the Thickness of Sintered Layer of Cobalt-Chromium-Molybdenum Powder
Authors: Saprykin Alexandr , Saprykina Natalya , Dudikhin Dmitry V. , Emelyanenko Sergey M.
Published: September 2014

At present the systems of layer-by-layer laser synthesis of three-dimensional articles are used to advance the introduction of new technologies and to reduce its costs. To produce articles in these systems a powder is applied and sintered layer-by-layer with a laser ray on the basis of a 3D CAD-model. The articles are produced in a particular range of laser action which is experimentally selected for each powder. The utilization of new powders, as well as selection of reasonable technological modes for producing articles of definite quality are vital tasks at present [1, 2].
Research of Steel Structure after Laser Treatment
Authors: Lobankova Olga V. , Zykov Ilya , Melnikov Alexandr
Published: September 2014

This paper studies the influence of a laser thermal effect on the material. It presents the research of the steel structure under laser irradiation. It explains and demonstrates the structure of steel 5140 after laser treatment. The research method, preparation for the research and material selection are described.
Stationary Rotation of the Partially Liquid-Filled Unbalanced Rotor under External Friction Force Action
Authors: Pashkov E.N. , Martyushev Nikita V. , Yurovsky Pavel G.
Published: September 2014

Rotor rotation with liquid layer on the chamber wall under viscoelastic action of the shaft within a planar model is examined in the article. The solution to the problem of determining the deflection of a rotating shaft with liquid filled chamber is given, which is important when designing an automatic balancing device. The issue of the cooperative motion of a solid body and liquid is considered in mathematical research. The set task is performed by applying D'Alembert's principle. The modeling results indicate that an increase in liquid’s mass in a rotor decreases its critical rotation speed; at the same time, the external friction accelerates the system’s self-centering. The developed mathematical models enable us to select the design parameters of a liquid-type autobalancer which operates within the set range of rotor’s angular velocity.
Evaluation of the Resource Efficiency of Foundry Technologies: Methodological Aspect
Authors: Ardashkin Igor B. , Yakovlev Alexey N. , Martyushev Nikita V.
Published: September 2014

A brief analysis of the approaches to the evaluation of foundry technologies’ resource efficiency is presented. It is revealed that when evaluating resource efficiency researchers apply different criteria which do not allow them, on the one hand, to more objectively estimate the parameters and, on the other hand, to relate and compare the advantages and disadvantages of each of the assessment techniques. Representatives of one of the approaches to resource efficiency evaluation focus on determining the technological side, while representatives of the other approach emphasize the priority of the technological and economic aspects. Taking the example of analysing the problems of the technology of casting by gasified models, it has been demonstrated that the evaluation of resource efficiency cannot be unambiguous. Constant monitoring of the process is required. The authors come to conclusion that it is the method of expert evaluation that allows being more flexible in the evaluation of the resource efficiency of foundry technologies. The result of the conducted methodological assessment is the developed formula for estimating the resource efficiency of foundry technologies.