bluuebunny/crossref_metadata_2025 huggingface dataset:
Robust Control of a Class of Uncertain Fuzzy Systems
Authors: Yang Hong , Lü Huan Huan , Zhang Le
Published: October 2014

Robust stabilization of a class of uncertain fuzzy systems is considered in this paper. The fuzzy systems not only exit disturbances which do not satisfy the so-called matching condition and contain uncertainties in the input channel, but have uncertainties in the state matrix. By using Lyapunov function, the robust state-feedback controllers are constructed. The controllers guarantee that the states of systems are robust stabilization. A numerical example is given to show the effectiveness of our method.
Gait Analysis and Simulation for a Three-Arm Robot
Authors: Huang Jin Ying , Jiang Zhi Hong , Huang Ming Ya
Published: October 2014

A three-arm robot is designed according to the needs of space operations. Four kinds of climbing are analyzed and the kinematics parameters of the robot are derived. Based on ADAMS virtual prototyping technology, robot modal is established and the climbing process of the robot on a pole is simulated for four kinds of gait, respectively. The force curves and effect factors are obtained so as to offer the design references for the robot.
Design and Implementation of a Rehabilitation Training Control System for Stroke Patients
Authors: Cao Fu Cheng , Wang Xian Wei
Published: October 2014

This paper involved designing and implementing a control system of lower limb exoskeleton. In order to combine the unity of the hardware with the flexibility of the software, a full digital control scheme integrated based on DSP processor was presented. By embedding advanced control strategies, the system can effectively control the exoskeleton joint motor. The proposed system can achieve accurate active or passive gait rehabilitation training along the trajectory planed and retrain their muscles and feeling of walking in their legs for paralysis patients at a lower cost.
Study of Machine Tool Selection Based on Fuzzy Comprehensive Evaluation
Authors: Tian Jian Ping , Yang Hai Li , Feng Xiao Qiang , Deng Mao Tao , Tang Pei
Published: October 2014

For multivariate and fuzziness of machine tool selection in CAPP system, fuzzy comprehensive evaluation has been proposed based on analytic hierarchy process. Fuzzy evaluating model system has been built. Through the synthetic analysis of the factors which influence on machine tool selection, fuzzy relation between the effecting factors is set up. Multivariate quantitative problems were solved well, and the uniqueness of machine tool selection is ensured. This method solved the problem of machine tool selection better and ensured the reliability & availability by running on the prototype system.
Study on Thermal Stability Properties of Epoxy Matrix/Fluorine and Silicon Composites
Authors: Lin Qin , Song Zhen Jiang , Xie Jian Liang
Published: October 2014

Fluorine and silicon resin has excellent thermal stability properties. The thermal stability properties of polymers modified by fluorine and silicon resin can be improved. In this paper, fluorine and silicon resin has been prepared by (1,3,5-tris(trifluoropropylmethyl)-cyclotrisiloxane and 3-aminopropyltriethoxysilane. The FTIR spectra and the 1H NMR spectrum showed the structure of fluorine silicon resin. The thermo gravimetric traces indicated that fluorine silicon resin had improved the thermal stability properties of epoxy matrix resin significantly. The temperature of decomposition velocity of unmodified epoxy matrix resin and modified epoxy matrix resin began to increase rapidly were 356oC, 375oC respectively. The final weight fraction of unmodified epoxy matrix resin and modified epoxy matrix resin were 4.6%, 6.5% , respectively. The temperature of the maximum rate of degradation were 398oC, 420oC, respectively.
Simulation and Analysis of DDR3 Bus Based on Fly-By Topology with Cadence
Authors: Wang Bao Po , Du Jin Song , Tian Xing , Bi Xin
Published: October 2014

For the requirements of different bus signals from high speed PCB with DDR3 components based on fly-by topology structure, coping strategies have been proposed respectively. For the address or command bus, a leveling-free strategy has been proposed. It shows that the phase difference can be nearly zero through reasonable constraints on PCB design. The strategy was applied to the clock bus and achieved good performance, combining with the rules of signal integrity. For the data bus, the timing sequence on source synchronous has been analyzed and the time margin was calculated. The reasonability of the design was verified through the simulation result with Cadence.
Research on Automatic Recognition of Separable Words in Modern Chinese
Authors: Li Xin Fu , Liu Bo , Tian Xue Dong
Published: October 2014

Separable words have important applications in many fields such as Chinese information processing, Chinese-English translation, teaching Chinese as a foreign language. There are about five thousand separable words distribute in the corpus of Chinese, and the word frequency is greater in the novel, so the study on identification of separable words is significant. This paper selects the higher discrete frequency of verb-object separable words as the object of the study, by examining the manifestation of extended components in different separable words and giving summary and detailed classification of the extended components on the large-scale corpus, a new approach is designed based on the words segmentation and the structure type of extended component. According to the experiments of identification mark to separable words of verb-object type, the average recall is 89.54% and the average precision is 87.43% in open test. The experimental results show that the method is effective.
The Attacking Dispersion Optimization in Multi Launch Rocket System Base-On Improved Genetic Algorithm
Authors: Wang Wei , Chen Wei Dong , Zhang Shu Qiang , Li Jiang Long , Xie Ya En
Published: October 2014

Firing dispersion of multi-launch rocket system is affected by launch sequence and firing interval significantly. Firing order and firing interval of the existing multi launch rocket system (MLRS) are optimized to improve the firing performance of the existing weapon system without changing the overall design of the weapon system. On one hand, based on optimization problem, the firing dispersion optimal model is established and the genetic algorithm is improved therefore, a sequence of mixed coding genetic algorithm is designed. On the other hand, simulation optimization of firing dispersion has been finished by the aid of fitness function which is based on the optimal model. Meanwhile, it testifies this algorithm’s validity and the simulation results can provide a certain reference value for engineering experiment.
Particle Swarm Algorithm Based on Boundary Buffering-Natural Evolution and its Application in Constrained Optimization
Authors: Wu Tie Bin , Zhou Tao Yun , Li Wen , Zhu Gao Feng , Liu Yun Lian
Published: October 2014

A particle swarm algorithm (PSO) based on boundary buffering-natural evolution was proposed for solving constrained optimization problems. By buffering the particles that cross boundaries, the diversity of populations was intensified; to accelerate the convergence speed and avoid local optimum of PSO, natural evolution was introduced. In other words, particle hybridization and mutation strategies were applied; and by combining the modified feasible rules, the constrained optimization problems were solved. The simulation results proved that the method was effective in solving this kind of problems.
Wind Power Prediction Based on Cloud Model and GMDH Two-Stage Optimization Approach
Authors: Wei Zhong Kang , Liu Dun Nan , Xu Yu Jie , Xing Jing , Du Yan Ling
Published: October 2014

Currently, large scale of wind power grid-tied has brought great security risk on the grid. Accurate forecast of wind power is of vital importance. In this paper, a forecast method based on cloud model and GMDH two-stage optimization approach is proposed. Firstly, association rules between wind speed and different atmospheric pressure are mined, cloud model inference method is applied to get the data of wind power speed at next time. Then, many forecast methods were applied to acquire power forecast data at next time, furthermore, combination forecast model based on GMDH is acquired. Through analyzing historical data, different atmospheric pressure and generation power of some wind farm in Jibei, it is verified that this model, having high practical value, can improve the accuracy of power prediction.
A Model of Competitive Hybrid Granularity Manufacturing Resource and its Unify Cloud Service Modeling
Authors: Liu Xuan , Tan Wei
Published: October 2014

With the application of cloud computing technology in the manufacturing industry, there appear all sorts of the manufacturing cloud services on the network. Basic of manufacturing cloud service is manufacturing resource, and the business process is the business context of the manufacturing resource. In order to improve the utilization rate of cloud services, a model for the hybrid granularity manufacturing resources with strong competitiveness is put forward, including basic information, basic function, business process and quality of service of manufacturing resource, and based on which cloud manufacturing service model is construct. The service discovery experiment is designed based on the manufacturing cloud service model, and the experimental results prove that the cloud service from strong competitive hybrid granularity manufacturing resource has more competitive power and higher utilization.
Application Study on an Extended Design Pattern
Authors: Li Ling Lin , Tang Jin Peng
Published: October 2014

Proposed a extend design pattern, which oriented distributed environment. Design framework in which import some components, such as command bus, command executor. Design the structure class diagram of the pattern. Expatiated components’ specific function, and analyses the command execution process in the pattern. Based on the pattern, when developers design command classes, there is no need to consider how to sequence the command object and send it to server, and they don’t worry about receiving data from server and anti-serialize from the received data. Conclude that developers can use command pattern in a network transparent manner in accordance with the original way.
Maintenance Management: Rationale of TPM as the Research Focus
Authors: Hj. Bakri Adnan , Abdul Rahim Abdul Rahman , Mohd Yusof Noordin bin
Published: October 2014

This paper aims to examine the Total Productive Maintenance (TPM) as the significant technique to improve the maintenance management of production equipment. Attempt was made to discuss the available literature related to existing techniques in maintenance management, particularly on breakdown maintenance (BM), preventive maintenance (PM), predictive maintenance (PdM) or condition-based maintenance (CBM), reliability-centered maintenance (RCM), computerized maintenance management system (CMMS) and TPM. The outcomes from these reviews would serve as useful guidelines for the future research in maintenance management. This review justifies TPM as a comprehensive technique to improve the flaw in maintenance management. Notably, TPM encompasses of all elements applied by other maintenance methodology, from tools and techniques to involvement of all operational hierarchical in the organization as what is very much required in manufacturing organization is to integrate different functional areas in a coherent manner.
Complex Adaptive Systems Integrating the Decision Making Process in Industrial Companies: A Scientific Conceptual Model
Authors: Wollmann Dewey , Arns Steiner Maria Teresinha
Published: October 2014

A company operating in a competitive and ever changing environment that wishes to be recognized as world class requires a management model that affords its executives a systemic vision. This article aims to describe a scientific conceptual model of an integrated support system for decision making (marketing, production, human resources and finance) for industrial companies based on the rules that originated in the theories and concepts of: (i) systemic administration; (ii) complex adaptive systems; and (iii) optimization methods (more specifically of artificial neural networks, the analytic hierarchy process and linear programing). The proposed model was presented to a group of 10 executives and consultants from industrial companies. The Collective Subject Discourse of these executives includes the possibility of having “tools” that guide their companies to World Class management, although the computerization and automation process of decision making can be “something” difficult and burdensome.
Research on Life Cycle Environmental Property of Biomass Biodegradable Packaging Material
Authors: An Xiao Hui , Liu Peng , Meng Qiang , Su Cheng Gong , Zhao Shuang
Published: October 2014

Biomass biodegradable packaging material as a new green packaging material is a hot research area of packaging material. In order to obtain its life cycle environmental property, the life cycle environmental impact of biomass biodegradable packaging materials was studied in this paper. Firstly, the life cycle assessment theory and Eco-indicator99 method were used to establish the life cycle assessment model for biomass biodegradable packaging material; Secondly, objective and scope of the assessment are identified through the research on characteristics of life cycle stages of biomass biodegradable packaging material; Finally, Simapro software is used to do the biomass biodegradable packaging materials LCA and the comparative analysis with the corrugated cardboard, kraft paper, modified starch biodegradable plastics packaging materials.
Investigation of the Datamation of Manufacturing Industrial Chain in the Big Data Era
Authors: Zhou Hang , Li Rui Qian , Yu Yue
Published: October 2014

The big data era enable us to carry out data operations based on the extremely large data volumes to realize the datamation of manufacturing industrial chain. This provides us a good opportunity to optimize the manufacturing industrial chain and upgrade the development of manufacturing industry. In order to provide beneficial references for the optimization of manufacturing industrial chain and the development of manufacturing industry, in this paper, we explore new paths to realize the datamation of manufacturing industrial chain based on the big data era background. We also analyze the advantages, as well as problems remained to be solved of promoting the datamation of manufacturing industrial chain.
Partner Selection of Agricultural Product Supply Chain Based on Discrete Particle Swarm Optimization Algorithm
Authors: Chen Ai Ling
Published: October 2014

Partner selection decisions are an important component of production and supply chain management. However, partner selection is a typical multi-criteria decision-making problem and many factors affect partner selection; it is hard to select the most appropriate partners in real circumstances, especially in agricultural product supply chain. In this study, a discrete particle swarm optimization algorithm is proposed to solve the problem. A numerical example for partner selection of agricultural product supply chain is given to illustrate the application of the proposed method and shows the proposed method is feasible and effective.
Research on Context-Ware Technology in Ubiquitous Learning
Authors: Zhang Jing , Zhang Li Wei , Wang Guang Yu
Published: October 2014

Ubiquitous learning in pervasive computing is the future way of learning environment. This paper briefly introduces the pervasive learning and its characteristics, through the analysis of a typical ubiquitous learning system, on how to implement context aware technology research, and proposed a general pervasive learning context aware model.
Application of the Operation Regulation Mode in the HVAC Engineering Teaching
Authors: Li Mao Ren
Published: October 2014

In this paper, through the stages of operation of air conditioning, the air conditioning system, fan coil surface type heat exchanger with the problem as an example, discusses the method will run regulation applied to air conditioning technology teaching. The operation regulation is not only based on the mathematics of computation and analysis, also by regulating the function in the enthalpy-humidity graphics performance air conditioning graphs rich operation.
Competence Portfolio for Students of Physics and Engineering Majors
Authors: Gnitetskaya Tatyana N. , Karnauhova Elena V. , Kovalchuk Natalia , Ivanova Elena B.
Published: October 2014

The authors introduce the concept of competence portfolio for graduates of physical and engineering majors, the relevance of which is undoubtful due to recently emerged dynamic of the content of physical and engineering majors. One needs to make up a portfolio to achieve two goals. The first - is to create a complete "picture" of the content of graduates’ competencies for employers, which is modified annually. Such portfolio, along with achievements of social and scientific activities includes competency structure as a hierarchical graph. The nodes of the graph contain learning disciplines, the study of which helps students of physical and engineering majors to develop this competence. The second goal – is the accumulation of graduate’s memory bank, which includes semantic structure of educational problems of physical and engineering disciplines that make an important contribution to the development of competencies. This article describes the strategy of achieving the first goal.
Diversity of Cell Wall Composition and Saccharides Production with H2SO4 Pretreatment in Bioenergy Material: Miscanthus
Authors: Xu Ning , Dai Ben Lin , Wu Zhen , Mu Fei Hu , Xu Ji Ming
Published: October 2014

Miscanthus is a high yielding bioenergy crop which has been tested as substrate for the bioprocess. In this study, we selected four typical pairs of Miscanthus samples which present different cell wall compositions. The sample shows significant difference in saccharine production with different concentration pretreatment of H2SO4(0.5%, 1.0%, and 4.0%). Much more pentose (about 15.0% -30.0%) was extracted in the supernatant solution; and no significant difference between four species. The hexose yield of all samples is disciplinary and not in order. Direct enzymatic hydrolysis of the H2SO4presoaked biomass was found to give higher hexose yields of 6.0%–13.0%, but low pentose yields of 1.5%–3.0%.Higher H2SO4concentration resulted in more hexose, but less pentose in enzymatic hydrolysis, while they exhibit good tendency in saccharin yields between four typical pairs.
Effect of Heating Rate on the Deinking Sludge Pyrolysis Character
Authors: Wang Yuan Yuan , Chen Jia Chuan , Yang Gui Hua
Published: October 2014

In this paper, the thermogravimetic (TG) and differential thermogravimetric (DTG) curves of deinking sludge from Huatai Group Co., Ltd were derived from tests of thermal gravimetric analyzer (TGA). Pyrolysis character and kinetics of deinking sludge were investigated using thermalanalysis. The result showed that the pyrolysis process was composed of three stages: water lose stage, organic decomposition and decomposition of residues. The dynamical model of this pyrolysis process could be expressed by three first-order parallel reaction. The kinetic parameters of pyrolysis reaction were calculated respectively by Coats-Redfern integration method, the effect of heating rate on the deinking sludge pyrolysis characteristics was discussed.
Synthesis of TiO2@Ag Nano-Composite Particles Using Pulsed Laser Gas Phase Evaporation-Liquid Collection
Authors: Chen Sui Yuan , Wang Jin Huan , Zhou Xian , Liang Jing , Liu Chang Sheng
Published: October 2014

The targets are micron-sized TiO2 powders and micron-sized Ag powders, TiO2@Ag nanocomposite particles with core-shell structure were synthesized by pulsed laser gas phase evaporation-liquid phase collecting method. The morphology, structure and synthesis mechanism of the samples were studied by means of transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), and X-ray diffraction technique (XRD). The results show that the pure TiO2 nanoparticles sol was firstly prepared as liquid phase collecting system using gas phase evaporation-liquid phase collecting method; then, the target was changed using Ag, and TiO2 @ Ag nanocomposite particles with core-shell structure, which are spherical or ellipsoidal, were successfully synthesized under certain conditions of laser synthesis parameters; the diameters of most TiO2@Ag nanocomposite particles covering synthesized after 2h range from 15nm to 35nm, the diameters of most TiO2 @Ag nanocomposite particles covering synthesized after 4h range from 25nm to 50nm, and the size of nanocomposite particles increases with the increase of covering synthesis time; TiO2 nanoparticles synthesized previously in liquid phase function as crystallized cores, while Ag atoms and their clusters are adsorbed to TiO2 surfaces and surround the surfaces to form TiO2 @ Ag nanocomposite particles.
Use of Adsorbents for Indoor Air Purification from Carbon Dioxide
Authors: Zubkova Marina Yu. , Maslikov Vladimir I. , Molodtsov Dmitry V. , Chusov Alexander N. , Gabdullina Ekaterina P.
Published: October 2014

Some adsorbents were tested for indoor air purification from carbon dioxide. The obtained experimental data on the capacity of adsorbents allowed to carry out estimated calculations for definition of daily quantity of a sorbent for absorption of excess quantity of CO2. An experimental stand for assessing sorption capacity of adsorbents for gas mixtures containing CO2 in the air composition, biogas, etc. created, allows using model gas carry out qualitative and quantitative estimation of the compositions of input and output streams and the absorptive capacity of the tested materials.
Optimization of Sodium Carbonate Pretreatment on Enzymatic Digestibility of Bioenergy Material: Miscanthus
Authors: Xu Ning , Dai Ben Lin , Wu Zhen , Mu Fei Hu , Xu Ji Ming
Published: October 2014

Pretreatment is a critical step in the conversion of lignocellulose to fermentable sugars. In this work, Miscanthus straw was pretreated with ammonium carbonate (Na2CO3), which was shown by earlier works to be an effective pretreatment of grass stovers and other plant materials in the context of ethanol production. Here, we explored several key parameters including Na2CO3 concentration (2–6%), temperature (120–160°C), and reaction time (10–30 min) to evaluate their effects on enzymatic digestibility using response surface methodology. The best conditions were found to be Na2CO3 of 4.4%, temperature of 150.7°C, and reaction time of 20.0 min, under which glucose yield reached to 294.5 g/Kg biomass.
PCBs Removing in Aged Landfill Leachate by an Innovative Biofilm Reactor with Biomass Carriers - Luffa Sponges
Authors: Zhang Min , Xia Shi Bin
Published: October 2014

PCBs removal in the aged leachate by a new combination process based on an innovative biofilm reactor with natural fiber media, combined coagulation with a two-staged sequencing batch biofilm reactor with Luffa Sponges (LS) as the biomass carriers (LS-SBBR), was studied in this paper. The results indicated that the total PCBs removal in the aged leachate was 51.97%, and the PCBs removals are mainly achieved by the removal of trichlorobiphenyls, the PCBs contents in sludge in the two-staged LS-SBBR were consistent with the conclusion that the PCBs removal in liquid phase of the second LS-SBBR was higher than that of the first LS-SBBR.
Research of Coal Pores and Integrity Evaluation Method Based on Fractal Theory
Authors: Li Ji , Wu Xin
Published: October 2014

Coal is a natural porous media, its porosity and structural integrity influenced the gas adsorption and desorption characteristics greatly, as well as physical and mechanical properties of coal. Scanning electron microscopy (SEM) is applied to acquire SEM image of four kinds of coal samples at different zoom levels, and the box dimension can be worked out based on the pore preprocessing of SEM images. Then, the numerical value of box dimension is used to describe the development degree of the four kinds of coal sample and four development degrees’ sequence. At last, the intrinsic relevance between fractal dimension and other parameters is analyzed through mathematic method. The results show as follows: coal sample has self-similarity characteristic; the fractal dimension is related to both the total number of pores and porosity degree; the data of the coal pore, analyzed through fractal dimension, are consistent with that through traditional method; what’s more, fractal dimension has more advantages in describing accuracy and simplicity.
Synthesis and Dielectric Behavior of a New Two-Phase Percolative BaTiO3-Cu/Polyimide Composite
Authors: Pan Zhi Long , Chen Jia Ting , Ao Shi Liang , Jia Jian Ping
Published: October 2014

The chemical reduction method was used to deposit copper nanoparticles (about 20nm) on the surface of the barium titanate (BT, r=50nm). Then the dielectric properties and the mechanism of BaTiO3-Cu/polyimide composite were studied. The results showed that the effective dielectric permittivity of the composite with 60 wt% of BT-Cu (less than 13.00 wt% of copper) fillers was greater than 120, and the dielectric loss of which was lower than 0.025. Due to very low dielectric loss, so this composite was a two-phase composite material, different from the three-phase composite (metal-ceramics-poly). It was concluded that copper nanoparticles were deposited on the surface of the BT nanoparticles by chemical bond. Owing to good dielectric properties of as-prepared composite, such new two-phase composites had a potential to become the most important ferroelectric material.
Immobilization of Laccase on Surface Modified Magnetic Silica Particles and its Use for the Papermaking Wastewater
Authors: Liu Ying , Wang Zhen
Published: October 2014

Surface modified magnetic silica particles for the immobilization of laccase. The maximal absorption capacities of laccase were evaluated systemically. Compared with unmodified magnetic silica particles, the modified magnetic silica particles showed better absorption capacity of the laccase. The immobilized laccase has been used to treat pulp and paper making wastewater, and showed high efficacy on the removal of COD.
Preparation Process and Mechanism of CuO-MnO2-TiO2-V2O5 in the Metallic Luster Glaze
Authors: Shi Xiao Tao , Feng Jun Li , Zhang Ting , Gao Xue Wen
Published: October 2014

The article is on the preparation of metallic luster glaze based on metallic oxide: CuO-MnO2-TiO2-V2O5 as the nucleation agent in the basic glaze of lead frit. Through the study on process factors such as: glaze formula, additive content, firing system as well as the modern testing instrument: XRD and SEM, the experimental results show that the optimum formula is: the mass ratio of Mn/Cu is 4, TiO2, NiO is respectively 20% and 3.5%. The composition of the frit and its content affect glaze surface luster, the mass ratio of Mn, Cu and its additive total amount, the content of Ti, ViO also affects the tone of metal luster and its crystallization degree.
Research of Coalbed Methane Fracturing Crack Initiation and Propagation Law
Authors: Lin Ying Song , Wei Xiao Fei , Zhou Xue , Han Shuai
Published: October 2014

Coalbed methane resource is rich in China, however the original fracture system is complex and the fracturing effect, the fracturing crack initiation and propagation law are different from conventional formations, so the conventional hydraulic fracturing experience is not applicable. This paper summarized previous experience, systematically discussed the main factors and influences of coalbed methane fracturing, analyzed the research progress of CBM for fracture propagation law and the main problems and put forward some recommendations on the development direction of theoretical research on coalbed methane fracturing, which are necessary for depth research of coalbed methane fracturing crack propagation law.
The Effect Nucleating Agent on Open-Celled Morphology of Polymer in Vibration
Authors: Li Bing , Huang Bao Shan , Nan Qiao Zhou , Qin Xue Mei
Published: October 2014

The purpose of this work is to analysis on cell morphology of polymer blends foam in different nucleating agent and vibration field. The addition of the nucleating agent promote the nucleating and improve the density of foam. The vibration influences the nucleating agent distribution in the polymer matrix. At the same time, the vibration make the walls between cells thinned, the bubble merged.
Application of Organosilicone and Gyoxal Crosslinking Agents on Tussah Silk Fabric
Authors: Liu Zhi Mei , Hou Jiang Bo , Lu Yan Hua
Published: October 2014

In this work, two environmentally friendly crosslinking agents were applied to chemically modified tussah silk fabric so as to improve the crease-resistant properties of the tussah silk fabric. The crosslinking agents were applied by padding method to the silk fabrics. The finishing mechanics and the technical factors on the finishing effects were analysized, and the optimum process conditions were then determined. The results indicated that the two crosslinking agents improved the crease resistant properties of the silk fabric, the crease resistant properties and the whiteness indexes of the organosilicone finishing tussah silk was more than that of the glyoxal finishing.
Effects of High Added Quantity SSA-SSP-GSP on Resistance to Carbonation of Concrete
Authors: Pan Chang Ping , Li Xiang , Lv Xiao Xia , Ge Sheng Jin , Shang Jian Li
Published: October 2014

This work is aimed at carbonation resistance of steel slag concrete based on maximum utilization of industrial waste residue. The investigation is conducted to study the carbonization resistance of concrete which containing steel slag aggregate (SSA), steel slag powder (SSP) and blast furnace slag (GSP). The ordinary concrete as baseline group, the other concrete are fabricated with the 25% SSA, in combination with 30% SSP and 20% GSP by total binder content. The microscopic properties are analyzed by XRD, SEM, micro-hardness tests etc. Experimental results indicate that the carbonation depth of concrete which adding 25% SSA, 30% SSP and 20% GSP, have lower carbonation depth significantly than the reference at 28 day and 56 day. The substitution of natural aggregate and cement are 25%, 50% respectively by industrial waste residue, that can improving microstructure of aggregate-cement stone interface, optimizing cementitious materials hydration environment, concrete presents better durability performance.
Humidity Conditions of Homogeneous Wall from Gas-Concrete Blocks with Finishing Plaster Compounds
Authors: Vatin Nikolai , Gorshkov Alexander S. , Nemova Darya , Gamayunova Olga , Tarasova Darya
Published: October 2014

In this article the single-layer homogeneous enclosure structure are considered. In this work calculation of vapor permeability of walls from gas-concrete blocks is made. The calculation of resistance to vapor permeability for rough walls and for walls with an external plaster covering is made. Calculation is executed in the context of St. Petersburg climatic conditions for external walls of residential buildings.
Nonstationary Thermal Conduction through the Building Envelope
Authors: Vatin Nikolai , Gorshkov Alexander S. , Rymkevich Pavel , Nemova Darya , Tarasova Darya
Published: October 2014

In this article the physical principles which explain divergences of calculated and experimental values of thermal streams and temperatures of building envelope are considered. In this work the simplest thermal conduction through building envelope is considered.
Kinetics of Mechanical Activation during the Manufacturing Process of Nanostructured Binders
Authors: Kapusta Mariana Nikolaevna , Kobzev Vadim , Nelubova Viktoria
Published: October 2014

Presented article is of interest to specialists in the field of building materials. The provided information describes nanostructured binders (NB) that are promising in the production of building materials for various purposes. As a result of conducted researches the character of hardening kinetics of NB with different composition was identified, which is similar to the classic representative of binding system – Portland cement. The importance of keeping the technological and temporal parameters of NB receipt by comparing it with a quartz suspension was substantiated. Also a system for monitoring the grinding process allowing to control and manage the technology was provided.
Study on the Cooling Effect of Zeolite Powder to High Viscosity Asphalt Mixture
Authors: Wu Xi Rong , Li Su Xian
Published: October 2014

Compared with tradition asphalt mixture, the construction temperature of high viscosity asphalt mixture is higher in the tunnel construction. It is necessary to adopt the warm mix technique of adding warm mix additives in high viscosity asphalt. The paper analysis the temperature decrease effect in adding zeolite powder in high viscosity asphalt and the performance of asphalt mixture with zeolite powder additive. The study result shows that the adding 8% of zeolite powder in viscous asphalt can cut viscous asphalt construction temperature of 15 °C or so. Air voids as one kind of volume indicators determines the high viscosity asphalt construction temperature, the cooling amplitude rate is 10 ~ 15 °C.
Energy-Efficient Vibratory Feeder of Bulk Construction Materials
Authors: Ishkov Alexander D. , Stepanov Alexander V. , Miloradov Svjatoslav V. , Voronina Irina V.
Published: October 2014

Any processing of bulk materials requires their moving and uniform feed (dosage). On this depends the quality and efficiency of many technological processes. For uniform and controlled supply of bulk, materials for transporting or processing machines use feeders. Among feeders in recent years, an increasing distribution received disk vibrating feeders, which are characterized by small size, without moving parts, prostate, reliability, accuracy and smooth control supply. Disk vibrating feeder has a horizontal spreading disk, which is located coaxially and with a gap below the outlet of the hopper. Spreading disk is connected with vibratory drive. This research was aimed at finding technical solutions ensuring the reduction of specific energy consumption of disk vibrating feeder. The study showed, that if the spreading disc perform with a central hole, which is closed by an elastic membrane, then this can significantly reduce the specific energy consumption per unit of production.
A Multi-Functional Resistance Furnace for Industrial Thermogravimetric Analysis
Authors: Liu Hui , Guo Dai Dong , Song Ting Shou , Liu Shi Quan
Published: October 2014

A multi-functional resistance furnace has been invented. Its main components include a normal resistance furnace and an electronic balance outside the furnace. The weight of the sample being heated inside the furnace was transmitted through a set of attachments and measured by the balance. Both the real-time furnace temperatures and the sample weights were recorded by a computer. Thermogravimetric curves then can be obtained. The present setup is advantageous over the traditional commercial thermogravimetric analyzers in analyzing samples with a large mass. The multi-functional furnace is cheap and may find important industrial applications such as raw materials thermal analysis or products oxidation or anti-oxidation tests.
Analysis for Transverse Knurling Process of the Assembled Camshaft
Authors: Zhang Peng , Kou Shu Qing , Zhu Huan , Liang Wen Chao
Published: October 2014

Three-dimensional elastic-plastic finite element simulation method is adopted to analyze the distribution of the equivalent stress, velocity field, surface area, tooth height and transverse knurling experiment is performed to testify the simulated results. The comparison between tooth profile of simulation and experimental one was carried out to confirm the forming rule of triangular tooth on the surface of tube. This study is a prerequisite for related subsequent research about knurling process.
Development and Application of Test Apparatus for Cutting Performance of Cutters of Large Excavation Equipment
Authors: Wang Peng Lei , Xia Yi Min , Ouyang Tao , Tang Lu , Guo Ben
Published: October 2014

In order to study the physical phenomena and mechanical properties of cutters when cutting rock, a test apparatus for cutting performance of cutters of large excavation equipment is established. The test apparatus is composed of a vertical loading system, a rotary loading system, a control system and a test system. Tests of different cut penetrations and spacings were carried out using the test apparatus. Meanwhile, the real-time images of the cutting process and forces acting on the cutters were obtained. The result shows that the test apparatus has good practicality and reliability, and it provides a laboratory test method to study the cutter-rock coupling mechanism and cutting performance of cutters.
Effect of Different Machining Parameters on Time-Dependent Flatness
Authors: Yi Wei , Jiang Zhao Liang , Li Zhi
Published: October 2014

Flatness of the face milled surface usually changes within a time of resignation after released from the fixture; and machining parameters have significance influence on the flatness of the milling surface. This paper studies the different machining parameters’ effects on the time-dependent flatness. The experiment was designed by Taguchi method. The experiment results reveal that the time-dependent flatness is influenced by machining parameter.
Effect of Laser Shock Peening on the Structure and Prosperity of K403 Alloy
Authors: Chai Yan , He Wei Feng , He Guang Yu , Li Yu Qin
Published: October 2014

To solve the crack and fracture problem in blade made of K403 alloy, the samples of K403 are laser shock processed and then the microstructure, microhardness, residual compressive stress and surface roughness of the samples are tested. The test results show that some grains are observed refined in the grain boundary of shock region, the microhardness improves in a depth of 0.8mm from the surface and the surface microhardness improves 16%, a residual compressive stress which is more than 450MPa is developed in a depth of 1mm from the surface, and obvious changes of the surface roughness are not tested.
Monitoring and Analysis of the Process of Conductive Heating Turning
Authors: Shen Teng Hui , Wang Xi , Zhang Tian Yu
Published: October 2014

This paper introduces conductive heat turning method using the high manganese steel as experimental materials.An experimental platform has been established, and vibration signal collected through continuous wavelet transform. By comparing and analyzing different processing parameters and working conditions,the effectiveness of conductive heating turning method’s reducing the vibration in the process of turning the size has been proved.
Microstructures and Wear Resistance of Iron-Based Protective Coatings by Supersonic Arc Spraying
Authors: Li Sheng Shou , Liang Tian Quan , Yang Xian Fang , Zhao Cui Hua
Published: October 2014

The characteristics in microstructure, surface morphology, chemical composition, hardness and wear resistance of the three protective iron-based compound coatings prepared by Supersonic Arc Spraying (HVAS), were investigated by X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM), Energy disperse spectroscopy (EDS) and Rockwell apparatus in this paper. It is indicated that the three coatings are typical layer and compact structures. The coatings are composed of Fe (s.s) phase and various kinds of ferric oxides, chrome carbides and/or intermetallic phase distributing along the interface of lamellar layers. More Cr and Ti, Al elements in the cored wires can degrease the diameter and alternate the morphologies of the holes in the coating, resulting from the formation of oxides, carbides and intermetallic phase during depositing the coating. The results indicate the SXTiAlC coating shows the most excellent wear performance among the three coatings. The wear behavior and mechanism are discussed.
Influences of Pulse Frequency on Structure and Mechanical Properties of DLC Films Synthesized by Pulsed Cathodic Arc Evaporation
Authors: Ye Bing , Jiang Xiao Hong , Zhou Bing , Piliptsou D.G. , Rogachev A.V.
Published: October 2014

Diamond-like carbon (DLC) films were prepared on the Si (100) substrates by pulsed cathodic arc plasma. The influences of given pulse frequency on the microstructure, morphology, mechanical and optical properties of DLC films were investigated by Raman spectroscopy, atomic force microscopy, Knoop sclerometer, X-ray double-crystal surface profilometer. The results showed that the variation of pulse frequency could significantly change the microstructure of DLC films, including the size and ordering of sp2carbon clusters and movement or diffusion of carbon atoms. The increasing of pulse frequency led to the variation of the relative fraction of Csp3/Csp2. The hardness and internal stress of the DLC films were affected accordingly. The results might contribute to the synthesis of DLC films with excellent structure and properties by cathodic arc evaporation.
Research on Compound Forming of Outside 3D Integral Fin on Stainless Steel Tube
Authors: Zhang Xiao Xia , Qiu Xiu Li
Published: October 2014

rolling/plowing-extrusion is a new method for fabricating outside 3D integral fin stainless steel tube.The effect was investigated about Rolling and plowing-extrusion affect the finned forming and structure. In this study, the rolling depth and direction were analyzed. The results are shown that The rolling processing play an important role to finned structure.When the rolling depth is 1.5mm, and other parameters are reasonable by right spiral groove, the optimal fins were obtained.
Corrosion Properties of Friction Stir Welded 2024 Aluminum Alloys
Authors: Chen Zhen Zhong , Wu Mao Min , Xiao Yao
Published: October 2014

The corrosion properties of friction stir welded 2024 aluminum alloys are studied in this paper. The results show that after 50 hours corrosion in 3.5% NaCl solution, the strength limit, Yield strength and elongations decreased compared to non-corrosion specimen, but not much. All fracture initiated at surface or sub-surface flaws at advancing side. Larger propagation zone is seen in corrosion specimen compared to non-corrosion.
Diameter Real-Time Computing of Uncoiler/Coiler Machines Based on the S7-300
Authors: Wang Hai Peng , Chen He Ping , Zhu Ying Tao , Hu Duan
Published: October 2014

Application of coil diameter calculation is very important in the industrial field. The demanding for the precision of control is increasingly strict. There are three methods to achieve a higher precision. They are the Count-method, Linear /Angular Velocity and Distance Calculation respectively. In the process of coiling and uncoiling, advantages and disadvantages are existed. There are different requests for realization of the functions as well. In the Siemens PLC S7-300 control system, these three methods can be used to achieve a higher precision of coil diameter calculation and control. Different improvements and adjustments, according to methods, are given in the process of the test. Some algorithm has been optimized. Finally, by using the three algorithms, the dynamic change of roll diameter can be calculated and meet the need in the course of steel strip.
Preparation and Performance of Crack-Free Silica Film on Glass Substrate
Authors: Niu Si Xun , Liu Shi Quan
Published: October 2014

In this paper, the glass was coated by silica film using sol-gel method. The influence of preparation conditions (such as the ratio of water to silica, aging time of the sol and the drying time of the film) on the film cracking was studied. Results show that when the ratio of water to silica is 1, aging time 72 h and drying time 6 h, the obtained film is crack-free. The film consists of nanoparticles distributed in silica gel. The thickness is about 45~60 nm. The visible light spectra measurements indicate that the coated film increase the transparency of the glass substrate. After the acid treatment and a scratching of 50 times, the spectra remain unchanged, suggesting a good acid and abrasion resistance of the prepared film.
Influence of Ultrasonic Treatment on Welded Joint Fatigue Performance in JG590 Steel
Authors: Sun Jun Sheng , Sun Hong Gen
Published: October 2014

JG590 steel is one of high strength, low alloy and high toughness engineering machinery steels, and its tensile strength is not less than 590MPa. The fatigue failure is one of the main forms of the welding structure failure. This paper studies the influence of the ultrasonic treatment on welded joint fatigue performance. Through the experiments, the paper compares the fatigue performance on as-welded welding joint with the performance on ultrasonic impact treatment welding joint. The results show that the ultrasonic treatment reduces the stress concentration factor by improving the geometry of the toe of weld’ area. It transforms the welding residual tensile stress on the surface of the welded joint into compressive stress, and makes the surface of the toe of weld’ area hardening. The fatigue strength of welded joint is increased by 114%, and the fatigue life increased by 133~184 times.
Effect of Wall Thickness of Hollow Sphere on the Stress Distribution of Random Hollow Sphere Syntactic Foam
Authors: Chen Zhuo , Zhou Zhou , Jiang Bing Yan
Published: October 2014

This paper addresses elastic analysis based on 3D finite element model for hollow sphere structures. In finite element models, which were analyzed under pressure of 1MPa, volume fraction of hollow spheres is kept at 30%, and hollow spheres are randomly located in the matrix. Five types of hollow sphere are used to form the model. All the types of hollow spheres have 60μm particle sizes, but different wall thicknesses. A comparison in stress distribution between the hollow sphere and matrix is made, which shows that in composites containing thin-walled hollow particles the maximum stress is located in the inner surface of particle wall, whereas increasing the wall thickness of hollow spheres results in getting some part of matrix around hollow spheres involved in energy absorption. Moreover, the location of the maximum stress in matrix related closely to the spatial arrangement of the particles. The study provides an insight into the micro structural performance of syntactic foam under load.
Fault Analysis of Journal Bearing Considering the Turbulent and Thermo-Hydrodynamic Effects
Authors: Xu Guo Hui , Zhou Jian , Geng Hai Peng , Lu Ming Jian
Published: October 2014

In order to investigate the cause of the typical bush rupture and wear damages in the journal bearing of the steam turbine generator set, the lubrication turbulence and thermo-hydrodynamic effects were studied. The generalized Reynolds equation, energy equation and heat conduction equations were solved with the finite difference method, and the pressure, temperature, thickness distribution of the oil film were obtained. Analysis results can be well explains the bearing bush burst in bearings maximum pressure place because of heavy load running. The bearing bush burst made friction intensified that caused oil temperature increasing and the viscosity reduce, which led to the rotor eccentricity increase, the minimum film thickness smaller and bearing static working point down, thus causing the wear damages until shutdown.