bluuebunny/crossref_metadata_2025 huggingface dataset:
Non-Axisymmetric Vibrations of Stepped Cylindrical Shells Containing Cracks
Authors: Roots Larissa
Published: May 2014

Based on the Donnell’s approximations of the thin shell theory, this paper presents solutions for the problem of free non-axisymmetric vibration of stepped circular cylindrical shells with cracks. The shell under consideration is sub-divided into multiple segments separated by the locations of thickness variations. It is assumed that at thejth step there exists a circumferential surface crack with uniform depthcj. The influence of circular cracks with constant depth on the vibration of the shell is prescribed with the aid of a matrix of local flexibility. The latter is related to the coefficient of the stress intensity known in the linear fracture mechanics. Numerical results are obtained for cylindrical shells of stepped thickness containing cracks at re-entrant corners of steps. Shells with various combinations of boundary conditions can be analyzed by the proposed method. Furthermore, the influences of the shell thicknesses, locations of step-wise variations of the thickness and other parameters on the natural frequencies are examined. The results can be used for the approximate evaluation of dynamic parameters of cylindrical shells with cracks and flaws.
Cardioprotective Effects of Saponins from Rhizoma Panacis Majoris on Myocardial Ischemia/Reperfusion Injury via Scavenging Excessive Reactive Oxygen Species
Authors: Bai Cai Hong , He Hai Bo , Cheng Fan , Wang Jun Zhi , Chen Xiao , Zou Kun , Liu Guang Yao , Chen Zhi Feng , Chen Jian Feng
Published: May 2014

Saponins from Rhizoma Panacis Majoris (SRPM), the bioactive component inRhizoma Panacis Majoris, were reported to possess protective effects on myocardial injury, but the underlying mechanisms remain poorly understood. This study was performed to investigate the protective effects and possible mechanism of SRPM on myocardial ischemia/reperfusion (I/R) injury in vivo. Cardioprotective effects of SPRM in I/R rats was evaluated by hemodynamic, infarct size, biochemical values, histopathological observations, antioxidative relative gene expressions; And the antioxidant activity of SPRM was studied using DPPH scavenging and β-carotene/linoleic acid tests. In the study, we found that SRPM possessed significant free radical-scavenging activity and considerable antioxidant activity, and significantly improved cardiac function, serum biochemical index and antioxidation level, decreased infarct size, reversed the down-regulated mRNA expressions of the SOD1, SOD2, SOD3 in I/R rats. The studies demonstrated that oxidative stress caused the overgeneration and accumulation of ROS, which was central of myocardial I/R injury. SPRM exerted beneficially cardioprotective effects on myocardial I/R injury, mainly scavenging oxidative stress-triggered overgeneration and accumulation of ROS, alleviating myocardial I/R injury and apoptotic cell death.
Numerical Simulation of the Cooling Process of the Blast Furnace Slag Fiber
Authors: Zhang Wei , Wang Xu , Xing Hong Wei
Published: May 2014

The cooling process of the blast furnace slag fibers was simulated and calculated by the numerical simulation software. The different length-diameter ratio fibers for 100:1 and 1000:1 were chosen and the temperature fields of the fibers cooling process under the different conditions were analyzed. The results showed that the single fiber’s solidification has begun at 0.1s, the fiber forms the whole shell on its surface at 0.9s, and the center of the fiber become solid at about 1.5s. Multi-fibers cooling process is different from the single fiber and the solidification time obviously become longer. 3-fibers’ solidification performs began at about 0.1s, and the whole solidification process needs about 5s.
Numerical Simulation Analysis of the Overall Stability of Hot-Rolled H Section Steel Beam Based on ANSYS
Authors: Zhang Peng
Published: May 2014

Based on finite element software ANSYS, the paper analyzed the overall stability of hot-rolled H shaped section Q235 steel beams with two symmetric axis under uniformly distributed loads, compared with the current code for design of steel structures, discussed the effect of high span ratio on the results of numerical simulation. The results show that when the high span ratio is less than 30, numerical analysis method and the standard methods agree well, but when the high span ratio exceeds 30, the error is big.
Node Classification Concurrent Transmission Algorithm Based on P2P Streaming Media
Authors: Jin Dou , Teng Da , Liu Ming Hui
Published: May 2014

P2P Live streaming systems is unstructured mesh topology, except satisfying large-scale concurrent node access, it would also lead to long transmission delay due to excessive number of times of data transmission. In order to reduce the number of times of data transmission in the network, the node classification concurrent transmission algorithm is suggested in this paper, which makes the peer-level nodes concurrent to initiatively transmit data, avoiding the inefficient bandwidth utilization of random transmission request of node and high management cost; meanwhile, each level will continue to transmit data to its next-level nodes, triggering and continuously accelerating the concurrent transmission within this level, thus to achieve the maximum use of bandwidth and reduce the overall delay of transmission. Analyze by conducting mathematical modeling, when the data content is divided into enough copies by classification concurrent transmission algorithm, the total time unit spend in transmitting data blocks to all of the nodes and the average time unit spent on nodes are superior to those of the existing transmission algorithms.
Comparative Analysis on Farmers’ Income under the Background of Comprehensive Well-Off Society in Heilongjiang Province
Authors: Zhang De Hua
Published: May 2014

The 18th national Congress of the Communist Party of China (CPC) points out that we will achieve the goal of well-off society in 2020. It won’t complete well-off society as a whole without well-off of farmers; the well-off society can’t be regards as completed one without well-off of grain farmers. Heilongjiang, as the national first major grain-producing province, it is particularly necessary for us to study well-off of farmers in Heilongjiang. The paper analyzes the level of farmers’ income and the well-off standard, and finally comes to the conclusion that farmers’ income has stepped into the rapid growth stage and farmers’ income can achieve the well-off level before 2020 in Heilongjiang.
Influence of the Three Gorges Project on Water Level in the Middle Reaches of Yangtze River, China
Authors: Jiang Liu Zhi , Wang Xue Lei , Ban Xuan
Published: May 2014

The alterations of the water level in the middle reaches of Yangtze River were investigated using the range of variability approach based on daily water level datasets extracted from 5hydrological stations.Results show that the operation of the Three Gorges Dam disturbed the hydrologic regime downstream and directly affected the water level to some extent. The rate and frequency of water level changes was most altered, while the timing of annual extreme water level was least affected. For the overall degrees of hydrologic alteration, high degrees were identified in Yichang (56%) and Jianli (47%) reaches; moderate degrees in Hankou (45%) reaches; and low degrees in Chenglingji (37%) and Luoshan (40%) reaches. Water level alterations in the middle reaches of Yangtze River were mainly caused by human activitiessuch as dam construction in the upstream and in-channel sand dredging, and also natural hydrological processes.
Experimental Study on the Shear Behavior of Fiber Reinforced Self-Compacting Concrete Rectangular Beams
Authors: You Zhi Guo , Zhou Yun Long , Yang Long Chao , Wang Peng
Published: May 2014

The main purpose of this paper is the analysis of the influence of steel fiber and hybrid fiber on the ultimate shear load and failure mode of rectangular concrete beams. The results of this experiment study indicate that fibers can enhance the ultimate shear load. Hybrid fibers can change the failure mode. The mechanical behavior of beam with hybrid fibers is better than that with mono-steel fibers.
The Influence of Gyri and Sulci on the Skull-Brain Motion Based on Two Two-Dimensional Finite Element Models
Authors: Wang Cong , Song Xue Wei , Hu Hao , Huang Tian Lun
Published: May 2014

The relative displacement between the skull and brain can be caused by road accidents and leads to permanent health issues or even death. The objective of this study is to investigate the influence of gyri and sulci on skull-brain motion with two two-dimensional finite element head models with detailed structures. The material properties were adopted from the relative literature and assigned to the different model parts. Firstly, frontal impacts were simulated by impacting the head models with the same box-shaped object respectively to enable a comparison between simulation results and experiment data. Next, the same load condition of Nahum’s experiment reported in the literature was used as input to the finite element models. The results indicate that the influence of gyri and sulci on skull-brain motion is not significant.
Effects of Cu Doping on the Microstructure and Electrical Properties of Sr3YCo4O10.5+δ Polycrystalline
Authors: Du Xiao Li , Yu Lan , Zhang Bin , Song Shi Jin , Li Guo Fang
Published: May 2014

Polycrystalline samples of Sr3YCo4-xCuxO10.5+δ (x=0, 0.2, 0.4, 0.6) have been prepared by solid state reaction method. Crystal structure has been checked by X-ray diffraction (XRD) and the results indicate that Sr3YCo4-xCuxO10.5+δ (x=0, 0.2, 0.4) with single phase have been synthesized in air, and the lattice parameters of Sr3YCo4-xCuxO10.5+δ (x=0, 0.2, 0.4) increase with increasing Cu content. Microstructure analysis demonstrates that the grain sizes enlarge and the number of pores decreases with increasing Cu content. The change of porous structure with different Cu contents is discussed by the liquid sintering theory. The temperature dependence of resistivity (ρ-T) curves of Sr3YCo4-xCuxO10.5+δ show nonmetallic behavior. And the electrical resistivity decreases successively with increasing Cu content, which is caused by the porous structure scattering the carriers as well as the increase of hole carriers.
Synthesis, Characterization, Structure and Thermal Decomposition of a Ag(I) Complex Derived from 3-Pyridinesulfonate and 1,4-Bis(2-Methyl-Imidazol-1-Yl)Butane
Authors: Hao Xiao Min , Chen Gang , Gu Chang Sheng
Published: May 2014

A novel complex of [Ag (bib)(3-pySO3)] n (3-pySO3:3-pyridinesulfonate; bib 1, 4-bis (2-methyl-imidazol-1-yl) butane) was synthesized and characterized by elemental analysis, IR, X-ray single crystal diffraction. The title complex belongs to triclinic system with space group P-1, a=7.8030(16)Å, b=8.0070(16)Å, c=10.742(2)Å,α=84.64(3)°,β=82.33(3)°,γ=82.76(3)°, V=657.8(2)Å3, Z=2, Dc=1.894g/cm3, μ= 1.697mm-1, F(000)= 374. Final indices is R =0.0480, wR =0.1169. Thermal stability and luminescent property of compound have also been investigated.
Optimization of Ferment Condition of ε-Poly-L-Lysine by Response Surface Methodology
Authors: Yang Yu Hong , Wang Hao , Wang Hong Ling , Wang Zhuo , Kang Zong Li
Published: May 2014

Streptomyces albus Y07, a strain which could produce ε-Poly-L-lysine (ε-PL) had been screened in our previous study. The fermentation conditions for ε-Poly-L-lysine production were further optimized through response surface method in this work. A central composite design was adopted to study the effect of culture volume, shaking speed, initial culture pH, as well as inoculation amount on ε-PL production. A quadratic polynomial equation for ε-Poly-L-lysine production was obtained by multiple regression analysis. The equation was as follow:
The accuracy and general availability of the polynomial model were proved to be adequate with R2 Pre = 0.8373. The optimized conditions were as follows: culture volumn: 50/500ml, culture pH = 7, inoculation amount: 10% of the total culture volume, shaking speed: 180rpm. Under the optimized conditions, the ε-PL production reached 1.085g / L. And the validity of the predicited model was further confirmed through verification experiments..
Structure and Motion Analysis of Intelligent Tracking Car Based on SolidWorks and Arduino
Authors: Lu Guang Yue , Wu Tao
Published: May 2014

This paper focuses on the use of infrared reflective photoelectric sensor for an intelligent tracking car which can automaticly recognize feature of routes. Arduino is used to control its motion and enable them to choose the right direction. SolidWorks is also used to model and analyze its motion.
Research on Material Properties and Soil Heavy Metal Pollution in Cities with Spread Evolution Model
Authors: Fan Yuan , Xu Min Xing , Lin Wei Xin
Published: May 2014

In this paper, mainly research the surface soil heavy metal pollution in cities. First of all ,we find out the spatial distribution of eight kinds of main metal elements in the urban; we adopt the improved gray model to establish evaluation system about urban pollution heavy metal element degree, and then to evaluate the pollution degree of heavy metal element in the city area. Eight heavy metals have been in dimension reduction by means of correlation analysis and principal component analysis, comprehensive variables can be got. By calculating the rotating component matrix, we got objective reason of metal contamination. We analyzed transmission characteristics of heavy metal pollutants and build model to determine the location of the pollution sources. We introduced the field theory the basic assumption , calculated various factors which lead to the change of one point of concentration. The differential equation model can be got which reacted geological environment evolution mode through the mass conservation. Finally we determine the location of the pollution sources and the evolution of the urban geological environment mode.
Research on Waste Tubes Recycling with Material Properties in Wuhan
Authors: Zhang Min , Wang Jia Ying , Liang Liang Liang , Hu Bin , Hu Wan Li
Published: May 2014

The theoretical framework of this research is Theory of Planned Behavior (TPB). And from personal profile, residual effect factors and attitudes to recycling, this research investigates the factors affecting residents’ behavior of recycling waste fluorescent tubes, the characteristics of the behavior and related preference. The survey data are collected by the means of questionnaires and their exploratory analysis is conducted by SPSS and Principal Component Analysis (PCA). The statistical result illustrates that the main factors affecting the behaviors are propaganda, enterprise, recycling device, stimulation and government. Based on the summary of research result, a recycling device used to recycle waste tubes in communities is designed to improve this research.
The Research of Conductive Polyaniline Doped by Composite Acids (Acetic Acid / Hydrochloric Acid)
Authors: Li Ju Heng , Long Jin Ming , Fu Ren Chun
Published: May 2014

In this study, polyaniline are doped by composite acids (acetic acid/hydrochloric acid) in the process of chemical oxidation synthesis. The results of X-ray Diffraction show that the introduction of acetic acid improves the crystallization ability of polyaniline; Laser particle size analysis shows that with the increase of acetic acid in the proportion of composite acids, the average particle size of the product first decreases and then increases; FTIR shows that the main absorption peaks moved to lower frequency, which illustrate the effectiveness of doping by the composite acids; the introduction of ethanol in the system lead to a lower doping level.
Applied-Information Technology in Safety Throughput Analysis for Crude Oil Pipeline System
Authors: Wang Yu , Liu Yang , Qi Pei Pei , Xiong Xiao Nian
Published: May 2014

The mathematical models of process calculation and safety throughput analysis of crude oil pipeline system have been established. On the basis of.Net platform and Microsoft Access DB tool, With the help of OLE DB database connection, The software of safety throughput analysis for crude oil pipeline system has been developed, by which the function of static and dynamic data management, process calculation, safety throughput calculation can be realized. By means of this technical measure, the operation management level of crude oil pipeline system will increase a huge step.
Application of an Improved Recurrent Neural Network in Network Security Situation Prediction
Authors: Cai Jun Ping , Qu Lei , Chen Gang , Yang Jun
Published: May 2014

The expansion of the network becomes size, network mode is diversification, network topology structure becomes more complex, the data traffic rises rapidly in the network, causes the network load increases, attack, fault and other unexpected network security events are more severe. Neural network to deal with nonlinear, complexity advantage of this paper, network security situation prediction based on improved recursive neural networks, experimental results show that the high efficiency of the method, results are compared with the actual values, low error, high accuracy.
Applied Technology with Electronic Materials and Information
in Autonomous Learning of Learners
Authors: Wu Chun Mei
Published: May 2014

With the development of information and technology, China is entering a new digital era. As the globalization’s deepening, English, as a communicativel tool, has become increasingly significant.To promote students’English competence so that they become more competitive and can keep pace with the trend of the times ,many universities put English educational reform high on the agenda.This paper probes into the current situation of college English teaching and finds some problems relevant to learning materials. Based on the reflection on these problems, an experiment was conducted in the context of applied technology, in which learners were encouraged to design the curriculum and select the elctronic materials according to their interest and need for learning under their teacher’s direction. After a 16-week experiment, there was a change in learners’ attitide towards their learning: they became more active and responsible for their learning and their learning interest was heightened and so did their academic performance. These findings show that electronic materials that take learners’ needs and interest into account are conducive to learners’ autonomy and the development of English competence.
Application of Intelligent System in Interpretation with Applied Technology
Authors: Tian Xian Zhi
Published: May 2014

Intelligent system has been used in many different fields. And many researchers have put their focused on the application of intelligent system with the development of information technology. The author of the paper has studied the intelligent system too with its application in interpretation. At the same time, some applied technology will also be analyzed in intelligent system. With the analysis of intelligent system, the author has found out many advantages of intelligent system for improving interpretation abilities of leaners and at the same time she also found out some measures to deal with some problems in intelligent system and some questions will also be listed for the future study. During the courses of study, some instructions and euipments have been used for effective results. The author hopes that all of the study will be useful for further learners and researchers in this field.
Automatic Method for Determining Cluster Number Based on Silhouette Coefficient
Authors: Zhou Hong Bo , Gao Jun Tao
Published: May 2014

Clustering is an important technology that can divide data patterns into meaningful groups, but the number of groups is difficult to be determined. This paper proposes an automatic approach, which can determine the number of groups using silhouette coefficient and the sum of the squared error.The experiment conducted shows that the proposed approach can generally find the optimum number of clusters, and can cluster the data patterns effectively.
Research on Applied Technology and Data Processing with Inversion Method Based on Bayesian Formula
Authors: Zeng Ren Fen , Gong Hong Wei
Published: May 2014

Inversion problem is always represented as ill-posed and unstable problem, especially in the practical application problem such as geophysics, geodetics, ocean science and so on. Regularization item, subject to data misfit is used to stabilize the inversion problem. In this paper we test its validity .The result shows that In selection of the trade-off parameter is very important.Trade-off parameter brings convenience for data processing of inversion method.
Data Processing and Technology Application in Bayes and Empirical Bayes Reliability Analysis of Parameter of Ailamujia Distribution
Authors: Zhou Hui
Published: May 2014

The estimation of the parameter of the ЭРланга distribution is discussed based on complete samples. Bayes and empirical Bayesian estimators of the parameter of the ЭРланга distribution are obtained under squared error loss and LINEX loss by using conjugate prior inverse Gamma distribution. Finally, a Monte Carlo simulation example is used to compare the Bayes and empirical Bayes estimators with the maximum likelihood estimator.
Illumination Uniformity Measurement Technology Research Based on Quasi-Sine Particle Swarm Optimization
Authors: Yao Qing Hua , Cao Miao
Published: May 2014

Illumination uniformity measurement technology of target is a main factor that influences the instruments’ function assessing and ballistic test. Non-linear optimizing strategy of illumination uniformity is introduced in this paper, and the method is put forward to improve illumination uniformity based on Quasi-sine Particle Swarm Optimization. This paper describes the basic principle and implementation steps of the algorithm. The objective function and the degree of orientation function are given. The objective function of optimization results show that the algorithm is convergent and the overall lighting objectives of the symmetry are obtained.
Numerical Simulation of Dynamics in the Zero-Range Process Based on Applied Technology
Authors: Zeng Ren Fen , Guo Dong Qin
Published: May 2014

In this paper,we first introduces zero-range process (ZRP) model simple and related theory. Dynamic behavior of ZRP in homogeneous system is described through the numerical simulation .The result shows that particle distribution almost distributed at one or two locations when b=1,the system is relative localization;almost all the particles is in one location along with the passage of time when b>1, the system is fully localized.
Study on the Strength of Textile during the Process of Supercritical Fluids Spray Dyeing
Authors: Wang Ming Lu , Wang Wei Qiang
Published: May 2014

The deformation and tension of textile between two dyeing roller during supercritical fluid spray dyeing was studied in this paper. The parameter equations were built by introduced the transformation parameter based on the mechanical equilibrium of infinitesimal element at the premise of considering the elasticity of textile. The results show that the internal stress of textile is far less than the tensile strength of the fabric, and the operating parameters of supercritical fluids spray dyeing has obvious effect on the deformation of textile. The simulating analysis may provide a theoretical basis and guidance for the actual process of supercritical fluid spray dyeing.
Intermittent Crank Rocker Mechanism Design and Analysis of Motion Characteristics
Authors: Deng Si Qi , Zhang Ming , Ma Deng Yun , Li Tao Tao
Published: May 2014

This paper presents an automatic separating and lifting mechanism with intermittent motion and the incomplete gear mechanism parameter design, and at same time the paper conducts the dynamics analysis by using vector closed equation analysis method. And its structural parameters optimization design is also done based on MATLAB. a parametric model is builded using SolidWorks and the virtual prototype model of four-bar mechanism is established in RecurDyn. Then the data exchange is done in dynamics analysis software RecurDyn, and the dynamics simulation of virtual prototype model is conducted and verified, which will get a better trajectory and achieve the design target. Through the mechanism design the automatic separation and upgrading process will be stable and reliable ,which has some promotional value.
The Design of Smart Home System Based on Bluetooth
Authors: Chen Su Hua , Shu Zhi Meng , Liu Hui , Lu Li Jun
Published: May 2014

Smart homes will give the disabled an opportunity for independence that they may not have had before. This paper designs an smart home system that communicates with a mobile device such as a cell phone or PDA via Bluetooth. Their approach sends messages via Bluetooth using the available Bluetooth module on the nodes. This means no further hardware is required and additionally no further costs arise.
Synthesis and Properties of a New Unsymmetry Diarylethene 1-{2-methyl-[5-(4-methylene-bromine)phenyl]-3-thienyl}-2-[2-methyl-5-(10-phenanthrenyl)-3-thienyl]perfluorocyclopentene
Authors: Jia Hong Jing , Duan Fang , Fan Cong Bin
Published: May 2014

A new photochromic diarylethene based on a phenanthrene, which is named 1-{2-methyl-[5-(4-methylene-bromine) phenyl]-3-thienyl}-2-[2-methyl-5-(10-phenanthrenyl)-3-thienyl] perfluorocyclopentene 1o, was designed and constructed successfully. We used it to accomplished recording by optical storage technology as memory medium. And its properties have been discussed systematically, including photochromic both in dichloromethane solution and in PMMA film and kinetics experiments. The result indicated that its photochromic behaviors could be modulated by UV/Vis light, changing between colorless and blue in dichloromethane solution and in PMMA film, respectively. What is more, the kinetic experiments illustrated that the cyclization/cycloreversion process of this compound was determined to be the zeroth/first reaction. In addition, the results demonstrated that the unsymmetrical diarylethene compound 1o, which we had synthesized, had attractive properties for potential application in optical storage.
Synthesis and Characterization of Hydrophobic Modification Guar Gum
Authors: Chen Feng , Wang Xu Guang , Yang Ren Shu
Published: May 2014

The HMG GG-C14 was prepared by pre-swelling guar gum hydrophobic modification in alcohol-aqueous solution, the optical reactive condition was determined by studying the respective influence of each condition on the performance of the resultant product, and the final product possessed an apparent viscosity of 19957mPa·s (the apparent viscosity of parent guar gum is 11764mPa·s) and a substituting degree of 0.93%. The Ft-IR spectra of GG and GG-C14 indicate the hydrophobic long chain alkyl was successfully grafted onto guar gum.
Critical Strain for the Initiation of Dynamic Recrystallization in a Fe-Cr-Ni Super Austenitic Stainless Steel
Authors: Hu Chao Bei , Guo Bao Feng , Zhang Yong Tao , Jin Miao , Ma Ming Fang , Yang Guan Qiang
Published: May 2014

In constant strain rate tests, the occurrence of dynamic recrystallization (DRX) is traditionally identified from the presence of stress peaks in flow curves. However, not all materials display well-defined peaks when tested under these conditions. It is shown that the onset of DRX can also be identified from the inflection point on the strain hardening rate (θ=dσ/dε)versus flow stress (σ) curve. In this paper, the hot compression curves can be described by an equation that fits the experimental θ-σ data from zero to the peak stress. An appropriate third order equation was fitted to the strain hardening data. The results show that the critical stress at initiation σc=-B/3A where A and B are coefficients of the third order equation. It is evident that this value depends on the deformation conditions. The stress–strain curve was then normalized with respect to the peak stress, leading to a normalized value of the critical stress (uc) equal to uc=σc/σp=-B'/3A'. Here A'and B'are coefficients of the normalized third order equation. This value is constant and independent of the deformation conditions.
Green Synthesis of Zinc Oxide Nanoparticles
Authors: Yuvakkumar R. , Suresh J. , Hong Sun Ig
Published: May 2014

Nephelium
lappaceum L. peels was effectively used for the synthesis of zinc oxide nanoparticles as a natural ligation agent. The role of rambutan extrac on the formation of zinc oxide nanoparticles was confirmed employing HPLC and GC-MS studies. The XRD and TEM revealed the crystallinity and spherical morphology of the biosynthesized nanoparticles. The size of the particles was found to be 20 nm as deduced from XRD and TEM analysis.
Stress Analysis and Exploration of the Rotary Valve
Authors: Yu Ji Cheng
Published: May 2014

the low pressure oil chamber and the high pressure oil chamber act directly on Both sides of the rotary valve. It will be large axial force to the valve body If the system working pressure is greater. The resulting outcome is low vibration frequency of the rotary valve driven hydraulic exciter. How to improve the hydraulic exciter frequency?We can improve the speed of the rotary valve or increase the number of rotary valve guide groove. But if we increase the tank guided number ,the diameter of the rotary valve spoo must be increased. Design a rotary valve without axial force can solve the problem of the rotary valve spool shaft size restricted. By calculation and analysis of the rotary valve spool suffered axial force . The work of a single rotary valve chamber pressure problems can be solved spool axial force
The Electromechanical Coupling Dynamics Modeling and Analysis of Portal Crane’s Hoisting System
Authors: Hu Shi Cheng , Ouyang Shuo , Zou Ning Bo , Wang Xiang Jun
Published: May 2014

In order to investigate the electromechanical coupling dynamic behaviors of portal crane's hoisting system, the electromechanical coupling model of the system was established by utilizing Lagrange-Maxwell equation. Taking the MQ2535 portal crane as an example, the electromechanical coupling dynamic characteristic curves of the hoisting system was studied based on the MATLAB simulation platform, in addition that the interrelate and interactive characteristics between the electromagnetic system and mechanical system was presented. It is shown that the results have larger difference compared with the results of neglecting the electromechanical coupling effects. This is because of the energy-stored role of the electromagnetic system and the load tracking property of the driving motor that the dynamic load got buffered and then the dynamic load factor became lower. The research results can provide theoretical supports for matching and optimizing the parameters of electromechanical system and improving the portal crane safety.
Equipment Design for Classroom Electrical Monitor Based on Power Line Carrier Communication
Authors: Zhang Zhi Jian
Published: May 2014

In order to monitor the classroom electrical power usage and achieve low-carbon energy. A kind of monitor equipment was designed by using STM32F103RBT6 as main controller and BWP09 power carrier communication module as the carrier communication media. Using this device, all of electrical appliances in classrooms such as fan, light and air conditioning were under remote centralized control. The control system can turn on or turn off devices and monitor working state of each electric appliance. When electric appliance break down, the system will alarm and send data back to the control room. Waste of electric of energy and burden of classroom administrators were reduced by using this device. Experimental results suggested that the classroom electrical appliance monitor work was stable and reliable, having practical popularized value.
Effect of Compression Storage on Structure and Surface Morphology of Silicone Rubber in Silicone Rubber-Stainless Steel Interfacial System
Authors: Yang Qiang , Wen Xiao Ping , Sun Chao Ming , Tang Guang Ping
Published: May 2014

The effect of compression storage on structure and surface morphology of silicone rubber in silicone rubber-stainless steel interfacial system was studied in the paper by means of ATR-FTIR, Raman spectrums, XPS spectrums and SEM. FTIR and Raman spectrums analysis indicated that no chemical change in silicone rubber was found during compression storage. XPS spectrums analysis indicated that there maybe surface chemical reaction took place during compression storage. SEM analysis indicated that the number and diameter of the open holes and microholes on the surface of samples decreased significantly with storage period, which hindered air to enter the interface when pressurized state was removed, and was beneficial for vacuum adsorption.
Biomechanics and Blood Pressure with Modeling of Pulse Wave Velocity Based on Multiple Linear Regression
Authors: Jia Long
Published: May 2014

The purpose of present study is to build a multiple linear regression model using biomechanical theory to assess the relationship of pulse wave velocity (PWV) with blood pressure, height and age. By testing the PWV, blood pressure, height, weight of 164 female adults aged above 45 and existing data, the author constructed a multiple linear regression equation. Through comparing the practical test PWV values with the estimate values from regression model, the result showed that there was no significant difference between the model assessment and practical test values (t=0.833, p=.423>.05). Therefore, the regression model is fit for assessing PWV value by height, age, systolic and diastolic pressure.
Design of the PLC Control System in Welding Oscillator
Authors: Yang Fu , Zhang Wen Ming
Published: May 2014

The system uses the PLC controlling step motor to propel the welding oscillator. It adopts the PLC to output pulses, which frequency is precise, so it is convenient to control the direction, and the mechanic part of the oscillator is simplified. At the same time, because of the step motor’s precise step and it is dependable driving, the welding oscillator controlled by this system is convenient to control, not only the oscillation velocity but also the standstill time at each point. The system’s stability can meet the practical need of the welding perfectly.
Effect of Compatibility between AlN Nanoparticles and Borated Bis-Succinimide on Tribological Properties of Base Oil
Authors: Wang Heng
Published: May 2014

The purpose of the research was to investigate effect of compatibility between AlN nanoparticles and borated bis-succinimide on tribological properties of base oil. The load-carrying capacity and anti-wear (AW) performance of base oil that contains aluminum nitride (AlN) nanoparticles or borated bis-succinimide (T152B) additive was examined; the tribological properties of the compatibility between AlN and T152B were also examined. The experimental results showed that AlN nanoparticles additive can effectively improve load-carrying capacity and anti-wear performance of base oil. AlN nanoparticles and T152B compatibility experiments showed that two additives have synergies to improve anti-wear performance of base oil. These findings indicate that AlN nanopaticles is an excellent load-carrying capacity and antiwear additive, and it can be used with T152B together in base oil.
The Design of Liquid Helium Temperature Zone Temperature Control System Based on G-M Refrigerator
Authors: Li Fan , Tu You Ping , Wang Shao He , Zhao Chao , Tan Rong , Luo Yan
Published: May 2014

The different low temperature electrical characteristics of insulating materials, which plays an important role in superconducting power equipment, has attracted extensive attention. The cryogenic control system is applied to the independent development of superconducting electrical characteristics of insulating materials testing device. And it is designed on the basis of LabVIEW, for the test of the electrical characteristics of the insulation materials in special environment such as cryogenic temperature and vacuum. The system which uses DC source as a heat source and G-M refrigerator as a cold source, uses PID algorithm to control the heat source with the cold source so as to achieve closed-loop control. The system can make the temperature of sample from room temperature down to 6.0K within three hours and control the temperature of sample in the range of 6.0K-300.0K. The system enables temperature error not more than ± 0.5K for a long time and provides a reliable low-temperature environment which is used for study of the electrical characteristics of the insulation materials in different cryogenic temperature and vacuum environment.
Applied Technology in Front-End Implementation of Tiger Compiler Using Hacs Language
Authors: Wang Yuan Da , Yang Tian Qi
Published: May 2014

This paper implements Tiger compiler on Hacs language. This compiler is likely to perform many or all of the following operations: lexical analysis, preprocessing, parsing, semantic analysis, and code optimization, target code generation. These are discussed in this paper in detail. As a new design language compiler, Hacs has the prominent advantages of high portability, maintainability and so on .It is easy to achieve.
Applied Technology of Customizable Architecture for 3D Graphics Render Engine Platform
Authors: Wang Ting Zhong , Li Xiao Hui
Published: May 2014

In order to avoid the flaw including rigid regulations of architecture, strong coupling among modules, removal of fault and advanced technology embedding hard in 3D graphics render engine, a customizable architecture for 3D graphics render engine platform was proposed. The architecture introduced some simulation models which were design standard, expansibility, assembly relation of simulation component resource, development of typical modules and component design. Application developer could customize simulation assembly component flexibly and compose own 3D graphics render engine generally.
Effects of Calcium-Containing Electrolytes on Anodic Coatings Formed on AZ91 Magnesium Alloys
Authors: Zhang Shu Fang , Zhang Rong Fa , Qu Biao , Zheng Yin Feng
Published: May 2014

Anodic coatings were prepared by micro-arc on AZ91 magnesium alloys in solutions with different calcium salts. The influence of calcium salts on the coating properties were studied. The result shows that anodic coatings formed in Ca (OH)2system has higher calcium content. When the Ca (OH)2concentrations is 2g/L, the Ca content is the highest, and the Calcium addition achieve the best corrosion resistance.
Synthesis and Properties of a New Asymmetry Diarylethene 1-{2-methyl-[5-(4-methylene-hydroxyl)phenyl]-3-thienyl}-2-[2-methyl-5-(10-phenanthrenyl)-3-thienyl]perfluorocyclopentene
Authors: Jia Hong Jing , Fan Cong Bin
Published: May 2014

A new asymmetry photochromic diarylethene based on a phenanthrene, which is named 1-{2-methyl-[5-(4-methylene-hydroxyl) phenyl]-3-thienyl}-2-[2-methyl-5-(10-phenanthrenyl)-3-thi-enyl] perfluorocyclopentene 1o, was designed and constructed successfully. And its properties have been discussed systematically, including photochromic, HPLC, concentration effect and fluorescent switch. The result indicated that its photochromic behaviors could be modulated by UV/Vis light, changing between colorless and violet in dichloromethane solution, respectively. What’s more, it could also response to various concentrations, with emission maximum density 5 × 10-5 mol L-1. In addition, the optical switch experiment illustrated that the diarylethene 1 functioned as a remarkable fluorescent switch, which fluorescent modulation efficiency was 63% in the photostationary state.
Synthesis and Properties of 1-(2,4-Dimethyl-5-thiazolyl)-2-(2-methyl-5-(2-methyl)-3-thienyl)perfluorocyclopentene
Authors: Liao Guan Ming , Zheng Chun Hong , Pu Shou Zhi
Published: May 2014

An asymmetrical photochromic diarylethene 1-(2,4-dimethyl-5-thiazolyl)-2-(2-methyl-5-(2-methyl)-3-thienyl) perfluorocyclopentene (1o) was synthesized and its photochromic properties were investigated. Upon irradiation with 297 nm UV light, 1o exhibited photochromism in solution and in PMMA film. The kinetic experiments showed that the cyclization and cycloreversion processes were zeroth and first order reaction, respectively. Moreover, diarylethene 1o also exhibited obviously fluorescence switches along with the photochromism.
Synthesizes and Properties Research of 1-(1,2-dimethyl-7-azaindole-3-Yl)-2-[2-methyl-5-(4-chlorphenyl)-3-thienyl] Perfluorocyclopentene
Authors: Sun Zhi Yuan , Zhang Cong Cong , Pu Shou Zhi
Published: May 2014

A new photochromic diarylethene compound 1-(1,2-dimethyl-7-azaindole-3-yl)-2-[2-methyl-5-(4-chlorphenyl)-3-thienyl] perfluorocyclopentene (1o) was synthesized, which properties were systematacially studied. The results showed that its absorption maxima were observed at 583 nm in hexane and at 597 nm in a PMMA film, respectively, upon irradiation with 297 nm UV light. Moreover, the diarylethene showed a remarkable fluorescence switches upon irradiation with UV and visible light.
Impact Behavior Characterization on Fractured Pins of AISI E52100 Steel
Authors: Vargas-Arista B. , Gómez-Morales M.A. , Garfias-García E. , García-Vázquez F.
Published: May 2014

Two fractured pins of impact wrench were evaluated by fractography using scanning electron microscopy. This pneumatic wrench is used to the fabrication of automotive components being characterized by its power and tightening capacity. The important part of the wrench is the pin clutch impact mechanism used to generate high torque. An original pin manufactured with AISI E52100 steel adjusted 2,580 nuts before fracture and a substitute pin of E52100 modified steel with S adjusted 7,095 nuts before failure. Fractographic analysis in both fracture surfaces indicated a ductile-brittle mixed fracture mode. Original pin surface exhibited a granular appearance while substitute pin surface showed fibrous and rough morphology. Precipitation of nearly rounded, elliptical and elongate second – phase particles containing Cr, C and Mn measured as intergranular and transgranular particle density was observed, promoting some brittle failure zones and ductile fracture measured as the volume fraction of grain boundaries and microvoids, respectively. A larger amount of intergranular medium precipitates was found on the original pin which favored the brittle failure among the grain boundaries compared to that of the substitute pin. The ductile fracture by larger transgranular fine particle density which acted as nucleation sites of higher volume fraction of microvoids was found in the substitute pin.
Influence of Cr and Nb on the Overlay Deposited on D2 Steel by Plasma Transferred Arc Process
Authors: García-Vázquez F. , Hernández-García H.M. , Vargas-Arista B. , Aguirre A. , Granda-Gutiérrez E.E.
Published: May 2014

Among the different surface treatments used to improve the wear resistance of metallic materials, plasma transferred arc (PTA) is an attractive alternative to conventional techniques due to the intrinsic properties of its higher deposition rate, lower heat input and especially for the wide applicability of materials. The wide range of materials makes it possible to produce metallurgical bonding between the hardfacing layer and substrate material with very low dilution and distortion. Weld deposits are characterized by less level of inclusions, oxides, discontinuities and wear resistance. Metal-mechanic industry continuously requires recovering tool steel components subjected to severe wear. In this research Fe-based filler metal was deposited on D2 steel by using plasma transferred arc (PTA) process. The influence of Cr and Nb on Fe-based filler metal microstructure was investigated using scanning electron microscopy (SEM). In order to evaluate the mechanical properties were performed wear and hardness tests. The wear resistance and hardness values were compared with the results of a weld bead using nickel-based filler metal.
Systematic Study of Polycrystalline Flow during In Situ Tension Test by SEM of Pb-50%Sn at Room Temperature
Authors: López-Ramírez A.J. , Muñoz-Andrade Juan Daniel , Garfias-García E. , Aguilar-Sánchez M.
Published: May 2014

Microstructural evolution during in situ tension test at constant crosshead velocity of 0.38 mm/min, at room temperature of polycrystalline Pb-50%Sn alloy are reported. Direct observation during four steps of deformation, with a total deformation (εT) of 0.684, allows establish that the trajectories of grains during irreversible deformation process obey a sigmoidal motion. Such behaviour is related with dynamic recrystallization phenomenology and associated with grain boundary sliding between neighbouring grains and subsequent cavitation in order to allow emerging grains from the inner volume to free surface of Pb-50%Sn, as the main mechanisms of superplastic flow. The curve of true stress versus true deformation presented several fluctuations during irreversible deformation process in a similar way of the Portevin Le Chatelier effect. Also is observed in the early steps of plastic flow, hardening deformation, up to 27 MPa associated with the maximum stress. The activation energy values for polycrystalline flow, calculated in this work are between 67.5 to 68.07 kJ/mol and there are in a closed agreement with the activation energy of 65.7 kJ/mol, for grain boundary diffusion.
CuAl2 Intermetallic Hydrogen Evaluation after Mechanical Activation of Powders
Authors: López-Miranda J. Luis , Reyes-Hernández Tiberio A. , Hernández-Torres Ares G. , Romero-Romero J.R. , Pérez R. , Rosas G.
Published: May 2014

Water vapor in the air affects aluminum based intermetallic compounds to form hydrogen. We take advantage of this fact to explore the amount of hydrogen obtained from CuAl2 intermetallic after its mechanical attrition activation. For this propose, CuAl2 intermetallic alloy was first produced by conventional casting methods and then subjected to mechanical milling processing. After the mechanical activation of the CuAl2 powders, a chemical reaction between them and water was carried out at room temperature including additives such as CaO, Al and NaCl. The amount of hydrogen release was correlated with other phases produced after the chemical reaction. X-ray diffraction patterns and scanning electron microscopy studies indicates that these phases were aluminum hydroxides and cupper oxides. According to these studies, a significant presence of oxide and hydroxide products occurred in the samples with NaCl additions, indicating best capability for hydrogen generation.