bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Blockage Ratio on Detonation Flame Acceleration in Pulse Detonation Combustor Using CFD
Authors: Debnath Pinku , Pandey Krishna Murari
Published: October 2014

Detonation is the supersonic mode of combustion process which is essential for energy release from combustion process. Detonation is the more energetic process compare to deflagration mode of combustion process. The turbulence combustion flame cannot transit itself into detonation combustion process. So objective of this paper is to investigate the effect of obstacles configuration landed in detonation tube channel to propagate the detonation wave and diffraction encounters in an obstacles site. Four different cases of obstacles blockage ratio (BR) 0.4, 0.5, 0.6 and 0.7 were studied for detonation flame acceleration in detonation tube. A three dimensional computational simulation was done using unsteady green-gauss cell based solver for adopting the combustion simulation. As a result detonation flame propagation, detonation flame velocity and detonation flame pressure were increase in reducing blockage ratio from 0.7 to 0.4 and eddy viscosity of combustible mixture was increase with increasing the blockage ratio. From the analyzed four blockage ratio BR=0.4 is suitable for detonation mode of combustion and flame acceleration.
Biomechanical Characteristics of Transfer in the Rotational Movements on Uneven Bars
Authors: Potop Vladimir , Grigore Vasilica , Timnea Olivia Carmen , Ulareanu Marius Viorel
Published: October 2014

This paper tries to highlight some biomechanical characteristics of the transfer in the rotational movements on uneven bars in women’s artistic gymnastics. This scientific approach led to a study conducted during the Masters National Championships from 16th to 18th of October 2012, in ”Nadia Comaneci” Polyvalent Hall of Onești. The study involved 7 gymnasts belonging to junior training team of Deva, aged 12 to 15. The following methods have been used in this research: method of bibliographic study, method of pedagogical observation, method of biomechanical video analysis using Kinovea and Physics Toolkit programs, experiment method, statistical method (KyPlot) and the method of graphical representation (Excel). The analysis of difficulty values of the technical elements on uneven bars as per the Code of Points emphasizes the dynamics of the vertical and horizontal transfer, depending on the category / type of the movement and the difficulty group. The results of the study highlights how the transfer is made throughout the routines on uneven bars in terms of kinematics and dynamic characteristics of the key elements of sports technique during the rotational movements. The efficient use of the postural orientation method based on the biomechanical analysis of the rotational movements on uneven bars showed the kinematic and dynamic characteristics of the key elements of sports technique according to the performances achieved in competition.
Study on Power Development in Children Adolescents in Human Motricity
Authors: Cojocaru Adin Marian , Cojocaru Marilena
Published: October 2014

Purpose, Educational process organized and conducted for the preparation of the volleyball players will have to teach them how to win through each action point game in hand, putting it all worth.
By its nature, involves a volleyball game open battle between attack and defense. The actions follow each other in a game properly basic game situations.
Approach seen in the overall structure of the game of volleyball and training components, based on objective reality, the power may be the quality that enable people to gain a point.
At work and in the attack, who hit faster, stronger and a point as high ball, has all chances to score.
Development of high power jump, jump off work, attack, attack raising the jump, jam, easy victory.
Methods, We have come a rich background material designed to general and specific to allow me an in-depth approach that we used the theme chosen by direct observation, which allowed me necessary data recording and development work in their dynamic test method we applied
Conclusions, In volleyball, physical training, work for power development in girls 13-14 years old (hope), in relation to their physical development, a chapter remained insufficiently addressed in the literature.
Modern game of volleyball, in addition to technical and tactical side, emphasis on preparing players and their physical size, which is why I was interested in this aspect.
The paper aims to select and apply the training hopes (junior III) means for developing a set of maximal anaerobic power in the legs, giving the planning system operated during preparation of a competitive year.
I want to check that:
Þ have led to the development means chosen maximal anaerobic power globally
Þ the players with large (178-180 cm), recorded an improvement in prison, comparable to that of the players with medium-sized (168-177cm).
Autodyn-2D Simulation of Shaped Charge Jet Formation and Penetration Mechanism into Multi-Layered Shielded Target
Authors: Guendouz Kamal , Sayhi Ayoub , Cheng Wang
Published: October 2014

In this work, the shaped charge jet formation depends on different parameters which can has effect on jet behavior such as jet velocity, breakup and penetration. Jet radius or liner thickness, shell thickness, liner material density, α angle and stand-off distance are evaluated in purpose to investigate their effect on performance of shaped charge jet velocity and jet breakup phenomena, also we investigate the effect of stand-off distance on shaped charge jet penetration into steel target. We also studied the performance of some protective shields materials in order to assure more protection for vehicle structure against shaped charge jet penetration. For that, different materials were used as armors such as: kevlar epoxy, polyethylene, glass epoxy, steel-1006 and Al2O3 ceramic. These protective shields were evaluated in order to show their performance against shaped charge penetration into target. To do so, adopted explicit dynamic analyzing program Autodyn basing on finite element were used to simulate shaped charge jet formation and penetration. Autodyn-2D simulationshighlight the efficiency of our work comparing with the experiments done in literature and Birkhoff’s theory. In other terms, increasing in shell thickness, alpha angle and liner densityenhance jet breakup time, protective shields layered armor of steel-1006, steel 1006 with polyethylene and steel-1006 with Al2O3ceramic give more protection for structure against shaped charge jet penetration comparing with others armors.
Research on the Optimal Disc Cutter Spacing for Rock-Breaking Based on ANSYS
Authors: Li Yan , Zhang Ke , Sun Jian , Sun Hong , Wang Zi Nan
Published: October 2014

Objective: To study the influence of disc cutter spacing on rock fragmentation efficiency and optimize cutter layout and improve the efficiency of disc cutter. Method: ANSYS, a finite element software was used to simulate double disc cutter cutting process. Result: Find a good corresponding relationship between penetration and cutter spacing. At the process of sandstone, if disc cutter spacing as 54 ~ 55 mm, rock crushing as the largest and rock fragmentation efficiency is the highest; with the penetration of 10 mm. If disc cutter spacing as 66~68.5mm, rock crushing as the largest and rock fragmentation efficiency is the highest with the penetration of 15 mm. Changing the cutter spacing and penetration, rock stress and broken degree will also change. Conclusion: Double disc cutters change within the range of best cutter spacing, cutter spacing is proportional to the rock crushing. If the cutter distance is greater than the best cutter spacing, the ledge will be appeared. For one type of rocks, the penetration would have some effects on the optimal cutter spacing. If the penetration increases, the optimal cutter spacing increases gradually, at the time of other construction parameters unchanged.
Analysis on Stability of POGO and Parameters of Propulsion System in Liquid Rocket
Authors: Li Hou Wang , Wang Cong , Zhang Xiao Shi
Published: October 2014

To explore effective methods of avoiding POGO instability, this paper starts with a thorough study on influence of parameters on natural frequency of propulsion system in liquid rocket. By adopting the method of critical damping ratio, stability of coupled structure-propulsion system is analyzed. The results show that installing an accumulator in suction line can effectively decrease natural frequency of propulsion system, which can improve the stability of coupled system. When cavitation and inertance of accumulator increases or installation position gets closer to top of pump, the influence of accumulator on the natural frequency becomes more significant.
Theoretical Analysis on the Ultimate Bearing Capacity for Steel Tubular Transmission Tower’s Joints with Annular Plate
Authors: Rong Zhi Juan , Wang Xue Ming , Lv Bao Hua , Zhang Xin Yue , Zhang Ling
Published: October 2014

The aim of this paper is to study the ultimate bearing capacity of steel tubular transmission tower’s joint with annular plate based on the theoretical analysis. A simplified model of annular plate joints was performed to investigate the force distribution of the tube-gusset joints. To obtain the state of stress and ultimate bearing capacity, the annular plate with clamped boundary condition on the inner edges and subjected to diametric loading is employed in this study by the direct integration and thin plate energy principle theory. Experiment and finite element analysis are carried out and the results show that both are the similar.
The Influences of Interdigitated Electrode Asymmetry on the Actuation Performance of Piezoelectric Materials
Authors: Gan Kuan , Li Min , Wu Meng Meng
Published: October 2014

The electrostatic field distribution of interdigitated electrode piezoceramics (IDEPZT) and piezoelectric fiber composite (IDEPFC) are analyzed by finite element method separately. The impact of the interdigitated electrode asymmetry on the actuation performance of piezoelectric actuators with a certain interlayer thickness is studied. The influence of the interdigitated electrode asymmetry on the actuation performance, stress concentration and electrostatic field concentration with different interlayer thicknesses are also discussed and compared. For piezoceramics, the results show that the actuation performance can be influenced little by increasing the degree of the excursion with a relatively thin interlayer thickness. As the interlayer thickness increases, the actuation performance can be influenced much by increasing the degree of the asymmetry. And it results in the decrease of the longitudinal free strain overall. The electric field becomes increasingly uneven as the degree of the asymmetry increases. The actuated stress can be improved evidently by increasing the degree of the asymmetry with a relatively thin interlayer thickness while the stress concentration is not increased apparently.
Study on the Combustion Characteristic of Adhesive Polystyrene
Authors: Chen Yan Fei , Yang Liang , Zhuang Shuang
Published: October 2014

In this paper, two kinds of adhesive polystyrene with different proportions and one retardant polystyrene board were studied by test of non combustibility, calorific value and single combustion test. By analysis and comparison, on the premise of the roughly same cost and thermal conductivity, adhesive polystyrene materials showed much less fire risk than that of the polystyrene board.
Experimental Study on Downward Flame Spread of Rigid Polyurethane Foam with External Radiation
Authors: Ma Xin , Tu Ran , Zhao Yan Li , Wang Nan , Xie Qi Yuan
Published: October 2014

Research on building insulation materials and their safety is an important topic in the field of building energy conservation. The objective of this paper is to analyze the coupling effects of the width and external radiation on the downward RPU foam flame spread characteristics. The most important flame characteristics including flame height, mass loss rate, flame spread rate were studied experimentally. The results suggest that with increasing external radiation levels, flame spread rate was larger. Under the condition of the external radiation heat flux exceeds a critical level, the RPU foam would be deformed and detached from the board when the flame spread to a certain distance. It also leads to a much higher flame height due to sufficient combustion. Additionally, the flame propagation firstly accelerated when it reaches to a certain distance and then becomes a stable subject to the preheating of the external radiation heat resource.
Flame Stability of Gaseous Fuel Combustion inside Meso-Scale Combustor with Double Wire Mesh
Authors: Yuliati Lilis
Published: October 2014

Flame stability of gaseous fuel inside meso-scale combustor with double wire mesh was investigated experimentally. Combustor was made from quartz glass tube with an inner diameter of 3,5 mm and an outer diameter of 5 mm. Two pieces of wire meshes were made from stainless steel inserted at 10 and 13 mm from the end of combustor. Propane was used as fuel in this research. Flame was stabilized in the region between two wire meshes. The flame has a blue luminosity, indicate no soot formation condition. However, the second wire mesh and combustor wall has red luminousity at high velocity reactant, indicate that they have high temperature and emmited heat radiation. Meso-scale combustor with double wire mesh has broader flame stability area if compared to combustor with single wire mesh. Extention of this region occured toward lower equivalence ratio for lean fuel mixture, as well as toward higher equivalence ratio for rich fuel mixture. The most important extention region of flame stability area is toward higher reactant flow rate. It was caused by existing of second wire mesh which has function to prevent occurence of blow–off at relatively high reactant flow rate, as well as to increase heat recirculation to unburnt reactant as a results of higher wall temperature.
Accounting for “Zero Curtain” Effect in GSHP Simulation
Authors: Vasilyev G.P. , Gornov V.F. , Peskov N.V. , Kolesova M.V. , Burmistrov A.A. , Timofeev N.A. , Leskov V.A. , Yurchenko I.A.
Published: October 2014

This paper contains the results of research, carried out with financial support from the Ministry of Education and Science of the Russian Federation (contract ID RFMEFI57914X0026). For the ground source heat pump (GSHP) used as a heating system in regions with cold climate the thermal effects of ground moisture freezing-melting processes can make an essential long-term impact on GSHP performance. However, widely known models of heat transfer inside and outside GSHP borehole do not take into account such effects. In this paper, we propose a method of engineering estimation of freezing-melting latent heat in the frame of modified cylindrical source model. The key feature of the method is the definition of effective thermal conductivity of ground to "convert" the latent heat of phase transition into equivalent heat flux from outer ground. The method is validated by laboratory measurements of ground thermal conductivity during the freezing-melting process.
Optical Computer Mouse Referenced Calibration of an Inertial Measurement Unit for Use in Unmanned Underwater Vehicles
Authors: Ikizoğlu Serhat , Kamer Yaver
Published: October 2014

In this study an inertial measurement unit (IMU) used in unmanned underwater vehicles has been taken into consideration.The main objective of this study is to improvethe measurements obtained from an IMU used in the position detection by minimizing the effect of its static and dynamic errors on the output. To enhance the IMU data optical computer mouse (OCM) is proposed as calibrator. The data received from the OCM is used to train an artificial neural network (ANN) which would improve the IMU outputs by trying to estimate the reference data from the actual sensor outputs. The ANN performance is compared with that of classic low pass filtering methods to provide a relative performance criterion. The ANN trained with OCM data has given satisfactory results. During the training of ANNs the effects of several parameters such as neural network architecture, activation functions, training algorithm, layer and cell number have been investigated. Thus, the results, findings and insights obtained in this study can be applied in research areas where this kind of nonlinear estimators are used.
A New Dielectric Elastomer Sensor Based on Cantilever Beam Structure with Constant Strength
Authors: Ni Na , Wang Yin , Liu Fan , Zhang Ling
Published: October 2014

Dielectric elastomer sensors are a new kind of capacitive sensors. They can be used to measure forces, pressures and deformations. The sensors have several advantages such as high elasticity and inexpensive fabrication compared with traditional sensors. In this paper, a new sensing device for measuring small concentrated force is proposed. The structure of the device is a cantilever beam with constant strength on which is fixed the dielectric membrane. The dielectric membrane is a capacitance sensor built with dielectric polymer coated with soft electrodes. When the cantilever beam is subjected to a concentrated force at its free end, the strain changed in the cantilever beam will induce the change in the capacitance of the membrane. According to the relation, the unknown concentrated force can be monitored by measuring the change in the capacitance. The testing results on the device show that the concentrated force at the free end of the cantilever beam is approximately proportional to the change in the capacitance. The prototype demonstrated the new device is capable of monitoring small concentrated force with prominent sensitivity.
Numerical Analysis of the Failure Modes for the Circular Dielectric Elastomer Actuator
Authors: Wang Yin , Ni Na , Wang Yong Jing , Wu Xiao Hong , Zhang Ling
Published: October 2014

The circular actuators of dielectric elastomer are a type of basic configurations [1]. A pre-stretched polymer film with an annulus electrode will be investigated in this work. The deformation along the radius was be proved to be inhomogeneous [2]. We study the inhomogeneous properties of circular ring actuators based on the ideal dielectric model and meanwhile obtain the failure modes of tension loss which will occur under different geometric parameters. For this type of circular actuator, the loss of tension will occur before electric breakdown. The method illustrated here is generic and can be applied to other complex circular configuration. The results will contribute to the further improvement of DE.
Comparative Research of 240-Coil Permanent Magnetic Brushless Motor with or without Potting Compound
Authors: Wang Shu Lung , Wang Yueh Hua , Chueh Ting Yu
Published: October 2014

In the design and analysis of motors, the issue of heat transfer is an important subject because it is relevant to the motor’s size and life. So, this study used an experimental design with the Taguchi Method to understand performance of epoxy resin on permanent magnetic brushless motors with 240 coils. The objects used for the experiment were a permanent magnet brushless motor with a 240 coiling number and a potting compound. The experiment was conducted to explore effectiveness of potting to reduce temperature. The Taguchi Method was applied to determine the optimal sample combination to obtain maximal experimental effectiveness by minimal test frequency. The results revealed from this study were positive for potting compound to transfer heat.
Application Analysis of Expanded Conductor in 1000kV UHV Double-Circuit Line
Authors: He Jian , Li Xian Xin
Published: October 2014

This paper discusses the feasibility and effectiveness of the application of expanded conduct in 1000kVultra high voltage AC (UHVAC) transmission line. Through the comparison and analysis between expanded conduct and conventional conduct in transmission capacity, mechanical properties, project investment, annual cost and other aspects, it shows that the initial investment of expanded conduct is 4% lower than that of conventional conduct; and the annual cost of expended conductor is superior to that of conventional conduct when transmission capacity, power price and use hours are low.
Preparation of Henriol C Molecularly Imprinted Polymer Microspheres
Authors: Luo Yong Ming , Luo Yong Dong , Chen Fang You , Zhang Xue Lian , Yin Xiao Ying
Published: October 2014

Molecular imprinted polymer micrcosheres (MIPMs) were prepared through precipitation polymerization by henriol C using as the template molecule. The morphologies of synthesized MIPMs were characterized by scanning electronmicroscope (SEM). Systematic investigations of the influences of key synthetic conditions, including functional monomers, cross-linkers and porogens, on the morphologies, yields and the recognition properties of the MIPs were conducted. The results indicated that the morphologies of MIPs with DVB as cross-linker was perfect, but their binding affinity is lower than that of MIPs with TRIM or EDMA as cross-linkers. And particle size of MIPs with TRIM as cross-linkers is small but with high binding affinity. Scatchard analysis revealed that the homogeneous binding sites were formed in the polymers. The application of MIPs with high affinity and excellent stereo-selectivity toward henriol C in solid-phase extraction (SPE) column might offer a novel method for the enrichment and determination of sesquiterpenoids in the traditional herbal medicine.
An Application on Medical Tele-Diagnosis Robot (MTR) for Real-Time Motion Detection
Authors: Mariappan Muralindran , Nadarajan Manimehala , Porle Rosalyn R. , Khoo Brendan , Kitt Wong Wei , Ramu Vigneswaran
Published: October 2014

The use of medical robots in healthcare industry especially in rural areas are hitting limelight these days. Development of Medical Tele-diagnosis Robot (MTR) has gain importance to unravel the need of medical emergencies. Nevertheless, challenges for a better visual communication still arises. Thus, a face identification and tracking system for MTR is designed to allow an automated visual which will ease the medical specialist to identify and keep the patient in the best view for visual communication. This paper emphasis on the motion detection module which is the first module of the system. An improved motion detection technique is proposed which suits a real-time application for a dynamic background. Frame differencing method was used to detect the motion of the target. The developed motion detection module succeeded an accuracy of 96% resulting an average of 97% of the whole MTR.
A Fault Detection Method Based on Feedforward Compensation in Mechatronic Control System
Authors: Lei Zhang , Qing Chang Tian , Feng Su Kui
Published: October 2014

For the fault detection of mechatronic control system, based on observer a feedforward compensation approach was presented. The model of a mechatronic control system was investigated and divided into two loops for disturbance compensation and fault detection. The external disturbance of the vehicle was analyzed, and the relationship between the support shaft friction moment as main disturbance element and the attitude effect of the vehicle was built by the way of data curve fitting. The adjustment coefficients were proposed respectively in nine kinds of running section of the vehicle, because disturbance was very complicated and time-variant in different section. Fault detection observer was designed to generate residuals in the inner loop, and the whole residual was calculated. The compensation was deduced in accordance with responses produced by the disturbance, so the disturbance could be compensated. Band filter was proposed for other noises. Finally, an example was presented to illustrate the proposed approach. The simulation results showed that the disturbance elements can be compensated rapidly.
Study of Fe(II) Biosorption Using Pleurotus Spent Mushroom Compost in a Fixed-Bed Column
Authors: Kamarudzaman Ain Nihla , Chia Chay Tay , Amir Amnorzahira , Abdul-Talib Suhaimi
Published: October 2014

The potential use of Pleurotus spent mushroom compost as a biosorbent for Fe (II) removal from aqueous solutions was investigated. The experiments were conducted in a fixed-bed column to investigate the influence of various parameters such as flow rate, bed depth and initial concentration on the biosorption of Fe (II). The results of breakthrough time, exhaustion time as well as the Fe (II) uptake and percentage of removal are highly influenced by the flow rate, bed depth and the initial Fe (II) concentration. The results demonstrated that the breakthrough time and exhaustion time increased with decreases in flow rate and initial Fe (II) concentration. Conversely, the breakthrough and exhaustion time decreased as the bed depth decreases.
Effect of Sophora Japonica Total Flavonoids on Mouse Models of Hyperglycemia and Diabetes Model
Authors: Miao Ming San , Cheng Bo Lin , Jiang Na
Published: October 2014

Objective: To investigate the effects of Sophora japonica total flavonoids hyperglycemia and diabetes in mice models. Methods: intraperitoneal injection of epinephrine, intravenous injection of freshly prepared alloxan or intravenous injection of streptozotocin, alloxan build adrenaline or hyperglycemia model streptozotocin diabetic model. Glucose values ​​were selected for each experiment> 11.1mmol / L, with a significantly more drinking, eating, and more urinary symptoms in mice 60, according to blood glucose levels were randomly divided into six groups, namely large, medium and small doses of Sophora japonica total flavonoids group, metformin group, the control group and model group. And were fed the appropriate medication, model group and the control group fed with the same volume of saline solution. Results: Sophora japonica total flavonoids can significantly reduce the adrenaline and alloxan mice with high blood sugar glucose levels, improve liver glycogen content; can significantly reduce the streptozotocin-diabetic mouse model of blood glucose levels and improve hepatic glycogen,can significantly improve the streptozotocin-induced islet cell damage. Conclusion: Sophora japonica total flavonoids mouse model of hyperglycemia and diabetes mellitus have a better hypoglycemic effect of its hypoglycemic effect and promote glycogen synthesis, reduce islet cell damage.
The Investigation of the Interaction between Daidzin and Bovine Serum Albumin by Fluorescence Spectroscopy
Authors: Wang Qing Ming , Liu Jia , Zhang Tian Xing , Zhu Feng , Tang Xin Hui
Published: October 2014

We investigated the mutual interaction of daidzin with bovine serum albumin (BSA) by fluorescence spectroscopy. The results revealed that daidzin cause the fluorescence quenching of BSA through a static quenching procedure. The Stern-Volmer quenching constant (Ksv) were calculated at different temperature. The binding site (n), apparent binding constant (Ka) and corresponding thermodynamic parameters △Go, △Ho, △Sowere calculated and the van der Waals interaction, hydrogen bonds and hydrophobic interactions play an important role in stabilizing the complex. Besides, we also studied the effect of Cu2+, Ni2+, Mn2+and Co2+on the binding constants between daidzin and BSA, it is shows that the binding of BSA and daidzin is strengthened in the presence metal ions.
Qumai Total Flavonoids Induced Diabetic Mice Model of Streptozotocin
Authors: Miao Ming San , Cheng Bo Lin , Jiang Na , Jiang Mei Qiong
Published: October 2014

Purpose: Research Qumai total flavonoids induced diabetic mice model of streptozotocin. Methods: 12 h after fasting groups of mice, Tail vein injection of citrate buffer chain urea with cephalosporins solution (80mg/kg,0.02ml/10g), To 1 times a day. In dosing 10, 20, 30 days tail blood glucose measurement value. On the 30th day fasting 12 h after the last for 1 h, Some blood, Measuring blood glucose、Glycosylation of serum protein, Serum insulin、Insulin resistance value;After the death in mice,Take the liver glycogen original value;Take the pancreas, and kidneys,10% formalin fixed liquid, As a pathological. Results: Compared with model group、blank group, each dose of dianthus superbus flavonoids to chain urea with cephalosporins cause diabetes in mice model can significantly improve the experiment indexes. Conclusion: Dianthus superbus flavonoids to chain urea with cephalosporins caused diabetes in mice model has good therapeutic effect.
Prosthesis Design for Bilateral Hip Disarticulation Management
Authors: Torres Mauricio Plaza , Aperador William
Published: October 2014

Hip disarticulation is an amputation through the hip joint capsule, removing the entire lower extremity, with closure of the remaining musculature over the exposed acetabulum. Tumors of the distal and proximal femur were treated by total femur resection; a hip disarticulation sometimes is performance for massive trauma with crush injuries to the lower extremity. This article discusses the design a system for rehabilitation of a patient with bilateral hip disarticulations. The prosthetics designed allowed the patient to do natural gait suspended between parallel articulate crutches with the body weight support between the crutches. The care of this patient was a challenge due to bilateral amputations at such a high level and the special needs of a patient mobility.
Meso-Damage Theory and its Application in Research of Materials Science
Authors: Peng Zhi Guo , Li Hang , Liu Hai Lang , Yu Hai Hua
Published: October 2014

Through introduction of meso-damage theory and application situation in recent years, the related categories and mechanism of meso-damage were analyzed. The previous research on the application of the meso-damage of various materials was discussed and various research results analyzed. The emphasis and advantages of meso-damage theory in material application were concluded.
The Preparation and Research on Multifunctional Environmentally Friendly Corrosion Inhibitor of Chemical Cleaning
Authors: Zhang Li Hui , Liu Zhen Fa , Guo Ru Hui
Published: October 2014

A kind of multifunctional environmentally friendly corrosion inhibitor (DHS) was prepared in order to protect many kinds materials from corrosion in iron and steel enterprise. The corrosion inhibition performance was studied by rotary hanging-piece corrosion tests . And biodegradability was investigated by biodegradation experiments . The experimental results showed that DHS has good performance both on corrosion inhibition and biologic degradable. It was suitable for the serious of materials and presense in iron and steel enterprise when the concentration of DHS was 0.4%. And the efficiency of biodegradability was 52.45% in 28d .
Structural and Magnetic Properties of Ni0.5Zn0.5Fe2O4 Synthesized through the Sol-Gel Method
Authors: Guan Beh Hoe , Zahari Muhammad Hanif , Chuan Lee Kean
Published: October 2014

This study investigates the influence of calcination temperatures on the magnetic properties of Ni0.5Zn0.5Fe2O4(Ni-Zn) ferrites.Ni-Zn ferrite with the chemical formula Ni0.5Zn0.5Fe2O4was prepared from their respective nitrate salts through the sol-gel method. The resulting ferrites were characterized using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and vibrating sample magnetometer (VSM). Single phased Ni0.5Zn0.5Fe2O4 was obtained at all calcination temperatures.FESEM Micrographs reveals an increase in the grain size with the increase of the calcination temperature. Consequently, the magnetic saturation of the samples were found to increase with each increase in the calcination temperature where the highest value obtained is 70.58 emu/g for the samples calcined at 1000°C.
An Experimental Investigation on the Mechanical Properties of Glass Fiber Woven Roving Fabrics/Chopped Strand Mats Hybrid Composites Manufactured by Different Processes
Authors: Tang Jun , Wu Zhi Hua , Xing Su Li , Zheng Qing , Shen Zheng
Published: October 2014

In this paper, the mechanical properties of glass fiber reinforced unsaturated polyester resin composite panels were investigated. To understand the effect of chopped strand mats on the mechanical properties of the composites, specimens with certain volume fraction of chopped strand mats manufactured by Vacuum Infusion Molding Process (VIMP) and Hand Lay-up techniques were tested under tensile, bending and impact loadings respectively. It was observed that the chopped strand mats enhanced effectively the mechanical properties of the composite panels manufactured by Hand Lay-up method, while the mechanical properties of the composite panels manufactured by VIMP decreased.
Research on Structural Optimization Method of Rack and Pinion Steering Gear with Variable Ratio
Authors: Niu Zi Ru , Li Gang Yan , Hu Jian , Yan Tian Li , Zhang Si Yu , Tan Jiang Jiang
Published: October 2014

Compared to the rack and pinion steering gear with constant ratio,the variable ratio rack and pinion of rack and pinion steering gear with variable ratio will cause changes in the force environment of the steering. It is necessary to analyze its structure and find the structural optimization method of the rack and pinion steering gear with variable ratio. The overall model of rack and pinion steering gear with variable ratio was established by using CATIA, and the stress-strain and the deformation analysis of the overall structure was carried out by using ANSYS Workbench. The analysis results provide an important reference basis for the structural optimization method of rack and pinion steering gear with variable ratio.
The Formation of Modified Layers at High-Speed Steels after Electrolytic-Plasma Nitriding
Authors: Skakov Mazhyn , Rakhadilov Bauyrzhan , Batyrbekov Erlan
Published: October 2014

In the article the formation peculiarities of the modified layer at R9, R6M5 R18 high-speed steels (HSS) after electrolytic-plasma nitriding are shown. It is established that in the result of electrolytic-plasma nitriding on the of high-speed steels samples surfaces formed modified layers with higher hardness. Hardness of HSS increased to 11.9-12.8 HPa after electrolytic-plasma nitriding, mainly depends to the formation of a diffusion layer of nitrogen martensite with Fe4N (γ’-phase) monophasic nitride. It is determined that a modified layer consists of nitrogenous martensite with Fe4N monophasic nitride. Perspectivity of use an electrolytic-plasma nitriding method to improve performance cutting tools made of high speed steels is shown.
The Influence of Zirconia Powder Dispersion Technique on Microstructure and Properties of Al2O3 – ZrO2 Ceramic
Authors: Veselov Sergey , Cherkasova N.Yu. , Timarevskiy R.S.
Published: October 2014

The results of microstructure and mechanical properties investigation for alumina and zirconia toughened alumina (ZTA) with 20 wt. % 3Y-ZrO2is presented. It was stated that the technique of preliminary treatment for zirconia suspension makes significant influence on sintered specimen microstructure. Introduction of the alloying additive treated with ball milling reduces Al2O3grain size in ceramic from 2-5 μm to 0.2-1 μm. The reduction of grain size increases the bending strength of ceramic material from 270 MPa up to 350 MPa. However fracture toughness of alumina and ZTA is 3.4 and 2.5 MPa·m1/2, respectively. It was shown that the low level of mechanical properties is related to the occurrence of major defects in the form of granule boundaries preserved at the forming stage.
Structure of Sintered Ti – TiC Materials
Authors: Krinitcyn Maxim G. , Pribytkov Gennadii A. , Korosteleva Elena N.
Published: October 2014

The results of studying of sintered powder Ti-TiC compositions are presented in this paper. Materials varying with carbon content and titanium powder dispersity sintered at 1300°С and were investigated. Sintering duration, carbon content and titanium dispersity were shown to influence on microstructure, average grain size, as well as porosity and crystal lattice parameters of titanium and titanium carbide.
Electron Beam Cladding of Vanadium and Carbon Powders on Carbon Steel in the Air Atmosphere
Authors: Mul Daria , Lazurenko Daria B. , Zimoglyadova T.A.
Published: October 2014

The electron beam cladding of vanadium and graphite powder mixture with additions of the flux agents on thick steel workpieces was implemented using the “ELV-6” electron accelerator. Structural and tribological investigations of the hardened surface were carried out. It was shown that cladding of vanadium-carbon powder mixtures by high-power electron beam injected to the atmosphere led to formation of high quality coatings. The highest microhardness level of cladded layer reached 12 GPa. Thickness of the surface layer was in the range 2.5-3.4 mm. Concentration of hard vanadium carbide particles increased with decrease of layer thickness which resulted in growing the wear resistance level of modified material.
The Structure and Wear Resistance of the Surface Layers Obtained by the Atmospheric Electron Beam Cladding of TiC on Titanium Substrates
Authors: Lenivtseva Olga G. , Lazurenko Daria V. , Samoylenko Vitaliy V.
Published: October 2014

In this study the structure and properties of surface layers obtained on cp-titanium workpieces by non-vacuum electron beam cladding of titanium carbide powder were investigated. The structure of modified materials was examined by optical microscopy and scanning electron microscopy. It was shown that the cladded layer had a high quality and thickness of about 2.3 mm. The cladded layer microstructure consisted of high-strength titanium carbide crystals distributed in titanium matrix. Morphology of titanium carbide particles and their volume fraction changed in the direction from the surface layer to the heat affected zone. The average microhardness value of the cladded layer was ~500 HV. Surface alloyed layers were of higher wear resistance compared to cp-titanium.
Influence of Mechanical Activation of Powder on SLS Process
Authors: Saprykin A.A. , Ibragimov Egor A. , Yakovlev V.I.
Published: October 2014

The paper presents the results of the experiment, describing the effect of mechanical activation of powder Cu and Ni on the nature of their SLS-sintering method. The changes in structure and bulk density of powders after mechanical activation are revealed, which generally has a positive effect on the synthesis process of a product.Intorduction
Evaluation of Abrasive Grain Form
Authors: Lyukshin V.S.
Published: October 2014

The form of grinding grains is an important parameter which as show researches, has a great impact on efficiency of use of grinding tools. Generally the methods used for an assessment of a form of grinding grains can be divided into two groups – qualitative and quantitative. The principle of an assessment of a form of grain on qualitative methods is based on grain reference on some signs in the relevant group of forms. All existing ways of a quantitative assessment of a form of grain are based on research of a horizontal projection of grain. However application of horizontal projection results in inaccuracy in the analysis of a form of abrasive grain. This work is devoted to accuracy increase at an assessment of a form of grinding grains.
Behavior of Poisson's Ratio in the Crystal Cu2O
Authors: Belomestnykh V.N. , Soboleva E.G.
Published: October 2014

Anisotropic and isotropic Poisson’s ratios for cuprum oxide are studied basing on the known experimental values of rigidity constants of Cu2O monocrystals within the temperature interval 4.2...873 K. The Poisson’s ratios of the given crystal are studied under the change of external conditions within the given intervals.
Spark Plasma Sintering of Mechanically Activated Ni and Al Nanopowders
Authors: Shevtsova Lilia I. , Sameyshcheva T.S. , Munkueva D.D.
Published: October 2014

The structure and mechanical properties of materials fabricated by spark plasma sintering of mechanically activated mixture of nickel and aluminum nanopowders were investigated. On account of the elemental powders ratio formation of Ni3Al compound was expected. Relative density of sintered samples was equal to ~ 95 %, microhardness of materials was 6540 MPa. Ultimate tensile strength of samples tested according to three-point bending scheme exceed 1100 MPa.
Numerical Modeling of Deformation Processes in Rock Pillars
Authors: Aksenov V.V. , Lavrikov S.V. , Revuzhenko Alexander F.
Published: October 2014

The mathematical model of rock mass in the context of its internal structure, anisotropy, loss of strength, elastic energy accumulation and release is considered. The numerical solution to the problem of quasistatic deformation in a rock mass pillar is obtained by the finite element method. The sequential development of softening and residual strength zones is considered. It is shown that if the softening modulus is strong enough then the deformation process becomes unstable.
Effect of Mould Heating Temperature on Cooling Rate of the Melt upon Bronze Crystallization
Authors: Martyushev Nikita , Petrenko Yuriy N.
Published: October 2014

The article presents the cooling curves of the tin-leaded bronze melt (consists of 10% of lead, 10% of tin, and 80% of copper) being poured in the moulds of various thermal conductivities: massive cast iron chill mould (with the 1:8 cast mass to mould mass ratio) and graphite mould. The curves were plotted for the moulds previously heated to the temperatures of 20; 200; 400; 600; 800 °С. Plotting of the curves was performed with the use of the device Thermograph designed at Tomsk Polytechnic University. The device records thermal electromotive force values of the chromel-alumel thermocouple and converts them into temperature values. The cooling curves are used to determine melt cooling rates within the temperature range involving the crystallization range. It is shown that under similar conditions the cooling rate when casting in cast iron mould is 30-40% higher than in the case of casting in graphite mould. The data given in the paper indicate that preheating of the mould enables us to considerably reduce the cast cooling rate and prolong the period of the melt being in liquid state. It is worth mentioning that cooling rate values of the preheated and non-heated casting moulds are most vividly observed at the initial moments after the melt pouring. When decreasing the casts’ cooling to 300-400 °С the cooling rates tend to be identical. In the article, the numerical data of cooling rates for various mould heating temperatures are presented.
Effect of CO60 Gamma Radiation on Material Surface Properties for Layer-by-Layer Laser Sintering
Authors: Gradoboev A.V. , Saprykin A.A. , Babakova E.V.
Published: October 2014

The research has been carried out to describe how gamma radiation of the Co60 radioactive isotope makes an impact on the copper powder, as well as the nature of sintering by the layer-by-layer laser synthesis. The changes of the structure and properties of the powder, which generally affects the layer-by-layer laser process of products sintering, have been detected.
Parameters of Force Interaction of Elements the Wave Transmission with Intermediate Rolling Bodies in Geokhd's Transmission
Authors: Begljakov V.Yu. , Timofeev V.Yu. , Dokhnenko M.V.
Published: October 2014

Parameters of interaction forces arising in the harmonic gear drive with a hollow shaft and intermediate rolling elements are considered.
Increase in the Lubricating Ability of Power Fluids by Modifying them with Fullerenes
Authors: Larionov S.A. , Ionov V.V. , Sarkisov Yu.S. , Gorlenko N.P.
Published: October 2014

The influence of fullerenes on anti-friction, anti-wear, and scoring-resistance properties of lubricants is studied.
Investigation of the Fine Structure Localized Plastic Deformation Zone of Superconducting Cable Components
Authors: Barannikova Svetlana A. , Shlyakhova Galina V. , Zuev Lev
Published: October 2014

Using atomic force, optical and electron microscopy methods, the changes in the microstructure and phase composition were investigated for the alloy Nb47%Ti used for the manufacture of superconducting cable employed as current-carrying elements in the ITER magnetic system (abbr. for International Thermonuclear Experimental Reactor). The test samples were prepared from the superconducting wire at an intermediate step of the drawing process for the area reduction Ø1.3→Ø1.2 mm. The effect of cold drawing and intermediate annealing on the properties of as-worked Nb-Ti alloy was assessed. Local strain zones were found to occur in the rupture area. The shape and chemical composition of Nb-Ti wire was examined for both a defect-free area and the rupture area. A Nb diffusion barrier was found to occur in the copper matrix of Nb-Ti wire.
Process Chip Formation with a Single Conditional Shear Surface
Authors: Proskokov A.V. , Petrushin S.I.
Published: October 2014

Most research on chip formation is based on free cutting with a single shear plane (the approach proposed by I.A. Time). No account is taken of the two-dimensional blade geometry nor of the three-dimensional character of the deformation source in the cut layer. It is assumed that the transformation of the cut layer into chip is confined to a very narrow zone adjacent to the shear plane. By contrast, constrained cutting is characterized by a conditional threedimensional shear surface, which is analogous to the shear plane.
Features of Arc Surfacing Process in a Longitudinal Magnetic Field
Authors: Razmyshlyaev Alexander D. , Ahieieva Marina V.
Published: October 2014

The electrode wire melting coefficient (αm) is determined for the submerged arc surfacing and welding in a longitudinal magnetic field (LMF) under reverse and direct polarities with ferromagnetic and paramagnetic (non-magnetic) wires. The maximum gain in the wire melting coefficient is achieved in the magnetostatic field assisted surfacing and welding. The effect reduces with the LMF frequency increasing to 4-6 Hz and virtually does not change with the further increase to 50 Hz. The electrode wire melting coefficient is shown to increase depending on magnetic properties.It has been established that the penetration depth of the parent metal reduces at the 50 Hz LMF surfacing when the longitudinal induction exceeds 65 mT.The constant and alternating LMFs reduce the speed of in-bath liquid metal flows, which results in the reduced parent metal penetration efficiency at surfacing.
Mechanism of Protective Membrane Formation on the Surface of Metal-Bonded Diamond Disks
Authors: Yanyushkin A.S. , Medvedeva О.I. , Saprykina N.A.
Published: October 2014

The article considers the problem of diamond disk efficiency when processing hard-alloy materials. Special attention is paid to the composition of greasy layer and mechanism of protective membrane formation on the surface of diamond disks. It is known that there are possibilities for blocking greasy layer and increasing cutting properties of metal-bonded diamond disks when polishing hard alloys.
Investigation of Dependence between Thermal Stability for Nano-Dispersed Metals and Velocity of Flame Spreading and Time Storage
Authors: Amelkovich Yulia A. , Nazarenko Olga B. , Sechin Alexander I. , Fraynova Kristina O.
Published: October 2014

Thermal stability of aluminum, iron and copper nanopowders, produced by electrical explosion of wire during heating in the air, was investigated in the work. Thermal analysis method was used for control of thermal stability for nanodispersed metals in heating in the air. It was shown, that after a long time of storage in air electrical explosion metal nanopowders have had extra active ones. Estimation of velocity of flame spreading in poured layer of the powders was carried out. Quality changes in investigated samples, happened for storage time, lead to increase of flame front length and its line velocity. The results of the researches could be used for diagnostics of fire danger of nanodispersed metals, also for selection of working regimes and provision of fire explosion safety for technologies which produce and apply of nanodispersed metal powders. Time-factor have not effected on criteria concerning the danger of the loads and have not changed its marking.