bluuebunny/crossref_metadata_2025 huggingface dataset:
Relationship Study between Bolt Shape and Anchor Performance
Authors: Ren Shuo , Wu Jian Xing , Li Jian Zhong
Published: October 2014

Relationship between bolt rib type, rib height, rib spacing and anchor performance have been studied through laboratory drawing test method. Bolt rib type plays a significant impact on the bolt anchor performance. The bigger of the bolt rib height and higher of the drawing force, the better of the anchor performance, but when the rib reach a certain height, drawing force will not increase obvious with the continue increase of rib height. Drawing force will different if the rib spacing is different, and with the increase of rib spacing, drawing force will increase at first and then reduce. When the rib spacing is about 30mm, the drawing force will get the maximum and the best of the anchor performance.
Application of EWK and Modified X-W Fracture Models to Load-Bearing Lug Joints
Authors: Liu Chao , Sun Qin , Liu Yan Jie
Published: October 2014

In the aeronautic field, ductile structure usually undergoes local fracture under complicated service loading conditions, which may triggers collapse of a structure. As a result, it is very essential to study the mechanism of fracture initiation and propagation of ductile materials especially under complex stress states. In this paper, a comparative study of fracture patterns of a load-bearing lug joints structure under several loading conditions with two ductile fracture models is performed by using the commercial finite element platform ABAQUS/ Explicit through a user material subroutine VUMAT. The numerical comparisons using two ductile fracture models in predicting failure of load-bearing lug joints structure shows that modified X-W fracture model agrees well with the experimental observation under complex stress states.
The Finite Element Research of Fatigue Properties of Steel Q345 Butt Welded Joint
Authors: Ouyang Wei Ping , Chen Liang Sheng , Xu Xiu Dong
Published: October 2014

The research of fatigue properties of the butt welded joint, though a large number of fatigue tests are need to be carried out, has significant influence to hoisting equipment’s design, development and using safety. This paper conducted a study on simulating the fatigue properties of widely used steel Q345 butt welded joint’s by finite element method based on the improved linear equivalent structural stress theory. The originally massive amount of fatigue tests and data processing could be saved. In order to ensure the accuracy of the fatigue modeling, a batch of Q345 butt welded joints were prepared for the fatigue tests which is used to contrast with the modeling result. The stress distribution under different load situation and the fatigue life of the joints, which have profound reference significance to hoisting machinery industry, can be acquired through modeling.
Automotive Floor Sound Package Design Using Statistical Energy Analysis
Authors: Ding Ju Yue , Shao Jian Wang
Published: October 2014

An increasing demand for vehicle noise control has been proposed and at the same time, vehicle weight and fuel economy have become critical for the automotive industry. The methodology of statistical energy analysis (SEA) is used to balance both light weight and high noise insulation performance. In this paper, the floor system which is one of the major paths for vehicle interior noise is studied with two sound package systems, the original floor insulation system and the lightweight one. The vehicle floor system is modeled by SEA and its transmission loss (TL) is analyzed. The results show that under certain sound package coverage, the TL of the floor system with the lightweight sound package is a little larger than the TL with the lightweight one. However, the lightweight sound package system has better absorption property and the advantage of weight reduction. Finally, in order to get the better TL, the sound package design is performed.
Simulation on Vibration Characteristics of Throat and its Timbre
Authors: Pu Tong Wei
Published: October 2014

This article from the vocal cords vocal mechanism, this paper presents a new model of vocal fold vibration and found the theoretical basis of the model is analyzed in detail on the proposed model, the establishment of research and analysis. The main vocal organs acoustic and acoustic characteristics of speech analyzed in the process. Study on the characteristics of the excitation source, the acoustic properties of the vocal organs and research work status channel. Lastly we analyzed the relationship between the vibration characteristics of the vocal cords and larynx between pronunciation tones.
Vibration Characteristics of Violin Bow String and its Timbre Effect
Authors: Zhao Guo Ming
Published: October 2014

This paper analyzes the modes of vibration of the strings and the strings of the material, the thickness effect on pronunciation, the establishment of a mass-spring model of vibrating strings and studied when the force pulling the strings and plucked violins panel vibration. Spectrum analysis and processing by MATLAB, the vibration of the resonance box is directly converted into sound, a sound judgment using spectral analysis methods.
Analysis of a Seismic Performance on K8 Triangular Cone Partial Double Layer Spherical Reticulated Shell
Authors: Lu Xiao Yang , An Ran , Chen Ya Ruo , Chen Shi Ying , Xin Jing , Liu Feng Cheng
Published: October 2014

In order to study the vibration and seismic performance of K8 triangular cone partial double layer spherical reticulated shell and analyze the factors that impact its self-vibration and seismic performance, this paper used parametric design language APDL of ANSYS to establish the shell model,then used 3D El-Centro seismic waves to analyze the influencing factors of its self-vibration and seismic performance by changing the ratio of rise to span, the ratio of thickness to span, bar section area and other parameters. Therefore this paper get some conclusions with engineering significance.
Method on Fault Detection and Diagnosis for Track Circuit Based on Main Rail Voltage
Authors: Wu Da Zhuang , Fang Yu , Ma Quan Song
Published: October 2014

This paper proposes a method of the fault detection and diagnosis for the railway circuit of ZPW-2000 system based on the main track voltage curve. Exact curve matching fault detection method and SVM-based fault diagnosis method are adopted. Based on envelope algorithm, exact curve matching method is used to match the detected current curve with the reference curve so as to predict whether the curve would have fault or not. Then, the SVM-based fault diagnosis method is used to make sure that the fault classification could be diagnosed intelligently. The experiment results show that the proposed method can accurately identify the track circuit fault state, and the accuracy rate in the diagnosis of the fault location is above 99%, which verify the effectiveness of the method in the fault detection and diagnosis.
Design of Capacitance Probe Sensor in Deep Hole Diameter Measurement
Authors: Ma Yu Zhen , Sun Xuan , Zheng Yi Zhong
Published: October 2014

Based on the working principle of the capacitive sensor, according to the requirements of deep hole diameter measuring, a capacitance probe sensor was designed, and then the design and type-selection of probe structure, cable inner structure to the capacitance probe sensor were done. At the same time, in order to overcome the measurement error caused by eccentricity, the capacitance sensor probe and inner hole of the corresponding fastener both are designed to a taper, taper positioning is relatively accurate positioning way. The design is to avoid the measurement position offset, and ensures the coaxality on the mechanical structure. The equipotential ring technology effectively overcomes the problem of edge effect of capacitance sensor, and makes the probe’s effective measurement electrode under the condition of limited long, can effectively guarantee the measure precision. By moving the capacitance probe in the hole to the different position, we will realize the deep hole diameter measurement in different cross section.
Research on Cotton Row Detection Algorithm Based on Binocular Vision
Authors: Zhu Zhong Xiang , He Yan , Zhai Zhi Qiang , Liu Jin Yi , Mao En Rong
Published: October 2014

As a relative locating method, machine vision is generally used for automatic navigation of cotton cultivator or cotton insecticide sprayer. However, it is difficult to achieve reliable and stable recognition of crop row with monocular stereo vision system, because it neither can access directly to the depth information of the image, which leads to massive time-consuming calculation, nor possess high-accuracy recognition or a good anti-noise property. This paper presents an algorithm for cotton row detection based on binocular stereo vision to be used for automatic navigation of cotton cultivator. The Zhang's plane calibration is used to obtain the internal and external parameters of the binocular stereo vision. Preprocessing means are applied to distinguish the cotton from soil, stereoscopic match is conducted according to the SIFT operators after the preprocessing of images, after which cotton space three-dimensional coordinates are acquired by parallax distance measuring method, with the elevation information combination of Hough transform, cotton lines are finally detected. The detection results indicate that this method has an accuracy higher than 90%, which primarily meets the need of automatic navigation for cotton cultivator.
The Study on Optimum Thickness of Thermocouple Used for Measuring the Grinding Temperatures of Brittle Materials
Authors: You Fang Yi , Dai Qiu Lian
Published: October 2014

The grinding temperatures were measured with half-cylindrical thermocouple which made by grinding method and measrued with foil thermocouple which made by rolling method respectively when grinding brittle granite with an Al2O3 wheel. Experimental results include average grinding zone temperatures and grains’ temperatures were analysed. The deviation of average grinding zone temperatures measured by them were within 6%. The foil thermocouples do not easily to lap due to the brittleness of the workpiece which usually makes the joint of thermocouples disconnected. But half-cylindrical thermocouples are more convenient to be prepared and be used than foil ones. However, the periodic “flash” impulses which reflect the grains’ temperature measured by half-cylindrical thermocouple were about 51% lower than the others. According to time constant, the thickness of the thermocouple less than 0.007mm is a necessary condition for measure the grains’ temperatures without distortion. The half-cylindrical thermocouple is too thick to have a momentary response time thus makes it out of the measurement accuracy range when it is used to measure the temperature of the grains. Therefore, foil thermocouple has an optimum thickness of 0.007mm is suitable for measuring the grains’ temperature while half-cylindrical thermocouple with average thickness less than 0.12mm is suitable for measuring the average grinding zone temperature.
A Kind of Small Quadcopter
Authors: Wang Quan Zi , Yang Zi Jian
Published: October 2014

This paper describes the Quadcopter’s body structure; principles of flight, hardware configuration, and analyzes the process of attitude algorithm adopting the complementary filter algorithm as well as the flight control algorithms.
A Method of Nonlinear Modal Superposition for Weakly Nonlinear Autonomous Systems
Authors: Wei Jian Guo , Zhao Lan Min
Published: October 2014

For a weakly nonlinear autonomous systems, the nonlinear coordinate transformation is provided in the form of power series expansions and the mathematical transformation from the physics system coordinate to the modal coordinate is presented. And then, according to the relations between physics system coordinate and modal coordinate, a method of nonlinear modal superposition is obtained. Using this method, the general solution of the vibration under any initial condition can be answered. In order to explain the applications of the method, numerical examples are presented in this paper.
Binocular Vision Sensor (Kinect)-Based Pedestrian Following Mobile Robot
Authors: Zhang Huang , Yan Rui Jun , Zhou Wen Shen , Sheng Long
Published: October 2014

This paper present a pedestrian following mobile robot with binocular vision sensor. Because Kinect is one of the most inexpensive devices of depth-cameras, it is used in our application. Human skeleton is extracted by using Kinect, and the location of human is checked by projecting the three-dimensional (3D) pose of skeleton onto 2D screen. This 2D screen is separated into three parts, left, middle and right. Mobile robot rotates and translates according to the corresponding location of pedestrian. To make the robot move forward and backward, the distance between spine point and mobile robot is calculated. Finally, a real experimental result is used to validate our proposed method.
Control System Research of Square Steel Tube Straightening Machine
Authors: Wang Shan Gang , Zhan Pei Yan , Xu Hai Bin
Published: October 2014

The article expounds the square steel tube straightening machine which is given priority to with PLC (Siemens S7-200) of the control system use testing car`s sensor to test square steel tube`s bending. Then, according to the curve`s size and location of the peaks and troughs of the curvature degree of square steel tube straightening machine control correct device again find square steel tube`s position of the peaks and troughs, and the peaks and troughs in the use of hydraulic cylinder for the opposite direction of compression. The hydraulic cylinder travel sizes are set to peak and trough values and tests again, until they meet the requirements. This control system can meet the control demands of square steel tube straightening machine, reflected the applicability, convenience, safety and reliability.
Performance Characteristics and Practice of Small Cylinder Crochet Galloon Machine
Authors: Mao Cheng Dong
Published: October 2014

A kind of small cylinder crochet galloon machine was designed; the technical features, principle and structure characteristics of the equipment were introduced, and the functions of major mechanisms such as cylinder crocheting and winding and their design were expounded. Practice indicates that small cylinder crochet galloon machine designed is a kind of excellent fancy yarn production equipment with simple structure, convenient operation and varieties replacement.
Structural Module Partition and Fault Diagnosis of Nuclear Electric Valve Based on Function Analysis
Authors: Zhang Chao , Zhang Jin Sheng , Wang Zhi
Published: October 2014

The electric valve cutting off or connecting pipeline of nuclear equipment is an essential component of nuclear facilities for safe operation, whose reliability directly determines working performance of entire nuclear device. Based on function analysis, module partition and structure analysis of valve have been carried out in the paper, and the direct correspondence between common faults and structural modularization of valve has been established. Furthermore, the proper methods and procedures of fault diagnosis for nuclear valve are put forward, which can guarantee safe operation of nuclear facilities.
A Novel Design of Manipulator Arm Control System Based on STM32
Authors: Chen Yi Xian
Published: October 2014

This paper presents a novel design of multi dof and multifunctional manipulator arm control system. It uses 32 bit microcontroller STM32 as the core control unit, by controlling the pulse width modulation to control the manipulator arm of the steering gear. It consists of a mechanical model, the control core module, operation module, power supply module. The manipulator arm can greatly improve labor productivity, accelerate the realization of industrial production mechanization and automation, it can replace human labor in order to realize the mechanization and automation of production, and protect the personal safety in harmful environment. It has the advantages of light weight, simple operation, and low production cost etc.
A Method of Height Adjustment for Unpowered Emergency Landing
Authors: Huang De Gang , Zhang Wei Guo , Wu Yun Yan
Published: October 2014

The aircraft needs to adjust its heading angle to go to the landing window after the loss of thrust. However, the actual height of the aircraft within the landing area may be higher than that of the landing window. In order to ensure a safe landing, a spiral drop is needed to lose height. Through some certain integer rings of spiral, the aircraft will fall into the landing window. On this stage of height loss, this paper proposes a method of height adjustment to make the aircraft land exactly into the window. This method can get the desired bank angle through calculating the height difference between the height in the landing area, where the aircraft is, and the height of the landing window. This bank angle ensures the aircraft just to go through exactly the landing window in integer spiral rings of falls. Finally through simulation, this paper tests the effectiveness of the method.
Mechanical Structure Design and Application for PCB Detection System
Authors: Liu Jing , Chen Bing Chao , Ji Han Hua , Jia Xiao Jun
Published: October 2014

PCB defect detection based on AOI is the key technology to realize the automation production of PCB, and the mechanical structure design of the recognition system is one of the most important technologies in the detection system, too. By modeling the main hardware of mechanical structure of the system, we have integrated the whole hardware structure of the detection system. In this paper, we firstly design the general structure of the PCB recognition system. Then, we propose five axis positioning platform and PCB installation device. Finally, the designs of PCB belt conveyor and image acquisition device are completed. By using the integrated hardware structure combined with software control, we can realize intelligent recognition for PCB detection.
Some Questions about Equivalent Circuit Synthesis and Nonlinear Electrical Circuit Implementation with the Specified Properties in the Electronic Simulation Tasks
Authors: Pivnev Vitaly Viktorovich , Basan Sergey Nikolaevich
Published: October 2014

In this paper we consider the problem of synthesis of equivalent circuits containing nonlinear electrical circuits, in general, any number of non-linear elements. The system of differential equations describing the linear non autonomous multi-pole after quasiequivalence transformations allows to synthesize an equivalent circuit of the multi-pole consisting of two-pole linear, nonlinear resistors, controlled voltage sources, etc. The question of replacing the series-connected voltage sources controlled by the operational amplifier, the implementation of linear and nonlinear two-pole resistors.
Study of Circuit Breaker Status Evaluating Model Based on Matter-Element Theory
Authors: Teng Yun , An Zhi Yao , Yu Ji Bo , Wang Ji , Zhang Yong Gang
Published: October 2014

In the paper, a matter-element model and correlation functions of running state is established based on fuzzy decision making by high voltage circuit breaker operating state evaluation index and its diversity and ambiguity. Based on matter-element theory, a circuit breaker model which can run the state judge's classic domain, node domain, and to be evaluated matter-element is established, and the use of a set of correlation functions of the calculation circuit breaker extension running parameters and status of the correlation between levels, from the size of the circuit breaker associated with degree of qualitative and quantitative evaluation of the state is evaluated qualitatively and quantitatively, and it is finally verified by examples the usefulness of this method. Studies have shown that the method can quickly and effectively identify the operational status of circuit breakers, hence it can provide a new way to identify the operational status of circuit breakers.
The Impact of NiCuZn Ferrite Material on the Inductive Wireless Charging
Authors: Li Dong Yue , Liang Di Fei , Zhao Qing
Published: October 2014

Based on the principle of electromagnetic induction coupling of the wireless charging system, the main factors of the transmission efficiency is the coupling efficiency between the primary coil and the secondary coil. In order to improve the charging efficiency, NiCuZn ferrite material can be added in the wireless charging system. Thus, the wireless charging system can obtain high flux, and improve the transmission efficiency.
A Unified Framework for the Evaluation of Complex Networks
Authors: Jiao Bo , Pang Xun Long , Guo Rong Hua , Du Jing
Published: October 2014

Graph metrics are important tools for the comparisons between networks. However, different graph metrics may lead to different evaluation results for a certain network. In this paper, we generate a unified framework for the multi-metrics and study the collective evaluation method for complex networks with multi-metrics. Finally, the experimental analysis verifies the correctness and practical values of the proposed method.
Highly Reliable Software Reliability Assessment Based on Statistics of Extremes and Bootstrapping Method
Authors: Tong Hao Nan , Li Qiu Ying
Published: October 2014

Reliability assessment of Highly Reliable Software is significant in the software reliability engineering because of the small-size failure data. A novel model based on bootstrapping method and statistics of extremes for highly reliable software reliability assessment was presented. Correlation coefficient method was applied in order to determine the extreme distribution pattern to which the failure data belongs. The bootstrapping method based on residual error was used to estimate the parent distribution parameters. Software reliability and mean-time-to-failure (MTTF) at the end of reliability test were assessed. Experimental results show the model has a higher accuracy in the small-size sample situation. The validity of the proposed method is examined.
Synthesis and Characterization of Polyacrylic Acid/Xanthan Gum/Bentonite Superabsorbent Polymer
Authors: Hou Dan Dan , Ding Shu Li , Xu Bo Hui , Chen Xiao Ran , Shen Xuan Ye
Published: October 2014

A novel polyacrylic acid /xanthan gum/bentonite superabsorbent polymer (SAP) was prepared through chemical crosslinking by a polymerization technique in a complete aqueous environment. This SAP was fabricated effectively by dispersing xanthan gum (XG) and bentonite in a monomeric solution, using N,N’-methylenebisacrylamide as crosslinker and ammonium persulfate as initiator. Fourier transform infrared (FTIR) spectral analysis showed that graft copolymerization reaction took place between acrylic acid (AA), XG and bentonite. The optimal process conditions of preparing SAP were investigated. Results showed that the relevant SAP had maximal salt-water absorption (98g/g) when mass ratio of m (bentonite):m (AA) was 5:1, m (ammonium persulfate):m (AA) was 1.75×10-4, m (N,N’-methylenebisacrylamide):m (AA) was 3×10-4, m (XG) :m (AA) was 1:5, the neutralization degree of AA was 75%. Bentonite can not only effectively increase water absorbency, but also improve water retention ability.
Performance Improvement in the Pattern Classification of Nominal Data Sets Applying Multiple Correspondence Analysis
Authors: Thom de Souza Rodrigo Clemente , Arns Steiner Maria Teresinha , dos Santos Coelho Leandro
Published: October 2014

Classification is a supervised learning problem used to discriminate data instances in different classes. The solution to this problem is obtained through algorithms (classifiers) that look for patterns of relationships between classes in known cases, using these relationships to classify unknown cases. The performance of the classifiers depends substantially of the data types. In order to give proper treatment to nominal data, this paper shows that the application of previous transformations can substantially improve the performance of classifiers, bringing significant benefits to the result of the whole process of Knowledge Discovery in Databases (KDD). This paper uses three different data sets with nominal data and two well-known classifiers: the Linear Discriminant Analysis (LDA), and the Naïve-Bayes (NB). For data transformation, the paper applies an approach called Geometric Data Analysis (GDA). The GDA techniques compared in this paper are the traditional Principal Component Analysis (PCA) and the underexplored Multiple Correspondence Analysis (MCA). The results confirm the capability of the GDA transformation to improve the classification accuracy and attest the superiority of the MCA in comparison with its precursor, the PCA, when applied to nominal data.
Research of Intrusion Detection System Object Oriented Modeling
Authors: Li Ling Lin , Tang Jin Peng
Published: October 2014

In order to intrusion detection system functional analysis easily and adapted to changing requirement, object oriented modeling technology is applied in Packet Capture System. The system architecture is proposed first, functional analysis is given for it s components. Static model and dynamic model are separately founded by united modeling language. An analysis of the advantages of the system is placed in the end.
Thermal Strength of Adhesion Bond
Authors: Andreev Vladimir I. , Turusov Robert A.
Published: October 2014

The article considers the one-dimensional problem of the destruction of the simplest model of adhesively engage consisting generally of the many plates, which are substrates (what are glued) and adhesives (glues). The ability of the model to resist to thermal impact without fracturing here conventionally called the thermal strength. The problem is solved in the elastic formulation.
Track Routing Optimization Model Based on Fuzzy Clustering Method
Authors: Meng Pin Chao , Yin Wei Shi , Jiang Zhi Xia , Li Yan Zhong
Published: October 2014

In order to determine the routing scheme of a line in city track traffic, a nonlinear constrained multi-objective 0-1 programming model is established, with the intervals as variables, and the optimal matching between the spatial characteristics of passenger demand and routing, as well as the minimization of operation cost as the objective functions. The equality constraint is built based on fuzzy clustering method, the number of variables is reduced, and the weighted coefficients are computed with objective function values. Taking Chongqing Rail Transit Line 1 as an example, a selectable routing scheme is calculated.
Study of Combined Forecast Model of Wind Power Output Based on GM-Weibull Wind Speed Distribution
Authors: Teng Yun , Hui Qian , Yu Xin , Liu Zheng , Zhang Yong Gang
Published: October 2014

The grey theory is employed to establish the grey prediction-wind speed Weibull distribution model and calculate the Weibull distribution parameters according to the randomness and intermittence of the wind power output. The wind speed distribution of the wind farm and the effective wind power density are predicted accurately, the wind power and the electric fan efforts in generating capacity and other important data can be obtained according to the actual terrain wind farm wind speed data.
Common Statistic Technology Applied to the Product Quality Control
Authors: Wang Xiao Qing , Liu Bing , Liu Yong Gui
Published: October 2014

This paper studies the convenient application of statistical control methods in quality control, which includes selecting Pareto chart, line chart, process capability analysis, correlation and regression analysis, orthogonal test and the control chart. The purpose, range and operation steps of these methods are in practical use in the textile industry. Furthermore, this paper describes the application of control chart by using standard operation procedure.
Statistical Analysis as an Instrument for Improving the Quality of Products from Cellular Concrete
Authors: Pospelova Elena Alekseevna , Elistratkin Mikhail Yurievich , Netsvet Daria Dmitrievna
Published: October 2014

Using statistical methods results of acceptance testing of products from autoclave cellular concrete of the enterprises of the Belgorod region were analyzed according to the measured compressive strength and density. It was found that when these indicators conform the regulations, their oscillations reach the frontiers of normal statistical distribution. It is shown that statistical methods can serve as a tool to control the quality of products and for finding problems in the production process with identifying the most important of them. The most expected causes of quality deterioration were identified. Recommendations for enterprise to bring the investigated process under the stable conditions were given. Thus it was shown that it is not always correct to judge the stability of manufacturing prosess only by output of quality products with a minimum level of defects. As an important tool for adjustment of production activities may be the use of statistical methods of quality management that can improve the efficiency of industrial enterprises.
The Study for Doubly Selective Channel Estimation Algorithm Based on Cluster Characteristics
Authors: Wang Yan , Zhang Li Yi , Zhang Rui
Published: October 2014

According to the wideband channel with the sparse characteristics of time frequency doubly selective fading, and the sparse energy mainly concentrating on a few clusters, this paper presents the compressed sensing algorithm, that is cluster-regularized adaptive matching pursuit (CRAMP) based on cluster characteristics. Through analyzing the time frequency doubly selective channel in orthogonal frequency division multiplexing (OFDM) system, and using the time domain and frequency domain correlation in channel, the algorithm uses the 2D-DFT as the observation matrix in compressed sensing channel. And then utilizing clustering characteristics, it estimates for each cluster rather than estimates for each element in channel. The simulation results show that the CRAMP algorithm in channel reconstruction accuracy and bit error ratio (BER) respects are superior to conventional compressed sensing ones.
Education Quality Measured by the Classification of School Performance Using Quality Labels
Authors: Góes Anderson Roges Teixeira , Arns Steiner Maria Teresinha , Steiner Neto Pedro José
Published: October 2014

Quality in education has been the subject of many debates, be it among managers in schools, in the media or in literature. However, the literature appears not to include methods or techniques for exploring databases to obtain classifications for this quality; nor is there a consensus as to the definition of “education quality”. To address these issues, this article proposes a methodology similar to the KDD (Knowledge Discovery in Databases) to classify Education Quality in schools comparatively, based on grades scored in school performance tests. For the purposes of this study, the test used was the Prova Brasil examination, which is part of the Basic Education Development Index (IDEB) used in Brazil. The methodology was applied to public municipal schools in the town of Araucária in the metropolitan district of Curitiba in Paraná State. Seventeen schools that offer elementary and junior high school education were included. All the grades of every student were considered from the early and later years at the schools. During the Data Mining stage, the main stage of the KDD process, three comparative methods were used for Pattern Recognition: Artificial Neural Networks, Support Vector Machines and Genetic Algorithms. These methods supplied satisfactory results in the classification of schools represented by way of a “Quality Label”, with Artificial Neural Networks having the best performance for the problem in question. With this quality label, educational managers can decide on which measures to adopt at all the schools to help them achieve their goals.
Mechanical Properties of Automotive Instrument Panels with Semi-Rigid Foam
Authors: Cheng Rong
Published: October 2014

Semi-rigid polyurethane foam to soften the instrument panel has a lightweight, impact and energy absorption performance, while improving the texture of the surface of the instrument panel. This article was prepared by one-step car instrument panel with semi-rigid polyurethane foam, through the design of the four factors and three levels orthogonal test program, using Fourier infrared spectroscopy to characterize its structure, measuring its apparent density and hardness properties of transformation, the combination of research influence of the proportion of polyether foam system.
The Utilization Efficiency of Natural Alumosilicates in Composite Binders
Authors: Kozhukhova Natalia Ivanovna , Fomina Ekaterina Viktorovna , Zhernovsky Igor Vladimirovich , Strokova Valeria Valerievna , Chizhov Rostislav Valerievich
Published: October 2014

The opportunity of application of natural aluminosilicate – perlite – as reactive mineral admixture and as individual binding component when production of construction materials.
Laboratory Permeation Tests of PS for Solidification of Relic Soils in Humid Circumstances
Authors: Chai Xin Jun , Chen Pei Hang , He Chun Feng , Rao Chen Xi
Published: October 2014

PS solution is widely applied for preservation and solidification of historical earthen sites in acid circumstances, yet for earthen sites in humid environment, the validity of PS solution is not determinate. The potential application of PS for strengthening Tianluoshan relic soils were evaluated by a series of laboratory permeation tests in the study. The results show that the permeation efficiency of PS solution are greatly related with dry density and initial water content of relic soils, the practical application guidance are also presented in the paper.
Structural Analysis of Lignin and its Thermal Performance under Supercritical Water Conditions
Authors: Jiang Wei Kun , Liu Yu , Lyu Gao Jin , Yang Gui Hua , Wang Chao
Published: October 2014

This study investigated the application of supercritical water as green and environmentally friendly treatment medium for hydrolysis and decomposition lignin in order to obtain the relation the products of phenolic compounds and the lignin structural. The processes were studied using three different biomass feed-stocks: poplar alkali lignin (AL), corncob enzymatic/mild acidolysis lignin (EMAL), and cornstalk or benzene–ethanol-extracted lignin (BEL), and lignin were identified by elemental analysis, FTIR, 31P-NMR. Experiments were performed in a batch stainless steel reactor at supercritical water 375°C at residence time of 10min. Main phenolic compounds from decomposition of lignin were identified by external standard method. Results indicated that the functional groups of AL, EMAL and BEL had a marked influence on the produces. More phenol OH groups and more benzene and phenolic contents could be gained under supercritical water conditions. The total produces reached to 74mg/g of dry EMAL and which was a high quality raw material as the source of phenol and 4-ethylphenol. The AL compositions of guaiacol, 4-methylguaiacol, 3-methoxycatechol, 2,6-dimethoxyphenol, 1,2,3-trimethoxybenzene had more than EMAL and BEL.
Study on ELISA Plates Modified with Methylacrylic Acid by 60Co Irradiation
Authors: Chen Di , Wang Hua Shan
Published: October 2014

Surface modified ELISA plates grafted with methylacrylic acid (MAA) were prepared by60Co γ-Ray irradiation at room temperature in MAA water solution. The optimum conditions of modification were decided by the water contact angle and the absorbency of polystyrene enzyme label plate. FTIR, XRD spectra and AFM images show that MAA and its polymer have been grafted to the surface of the ELISA plates induced by60Co γ-Ray irradiation. The volume concentration of MAA aqueous solutions reached 10%, and the radiative intensity was 10kGy, and correspondingly, the content of carboxyl group on the surface of ELISA plates reached 0.30mmol/cm2.
Vibrationally Averaged Potential Energy Surfaces and Microwave Spectra for Isotopic Ne-CO2 Complexes
Authors: Chen Rong , Luo Xiao Ling
Published: October 2014

Averaged potential energy surfaces for isotopic Ne–CO2complexes (20Ne–18O13C16O,20Ne–17O12C16O and22Ne–17O12C16O) are presented. According to the latestab initiopotential of20Ne–12C16O2(R. Chen, H. Zhu, D. Q. Xie, J. Chem. Phys, 133, 2010, 104302,) which incorporates its dependence on theQ3normal mode for the antisymmetric stretching vibration of the CO2molecule, we obtain the averaged potentials for20Ne–18O13C16O,20Ne–17O12C16O and22Ne–17O12C16O complexes by integrating the potential energy surface overQ3normal mode. Each averaged potential surfaces are found to have a T-shaped global minimum and two equivalent linear local minima. The radial DVR/angular FBR method and the Lanczos algorithm are applied to calculate the rovibrational energy levels. Comparison with the available experimental values showed an overall excellent agreement for all spectroscopic parameters and the microwave spectra.
Mechanorphore-Based Poly(Glycidyl Methacrylate) Synthesized by Atom Transfer Living Radical Polymerization
Authors: Liu Xiao Bing , Gong Fei Yan
Published: October 2014

Mechanorphore-based Poly (glycidyl methacrylate) was synthesized by atom transfer radical polymerization (ATRP) of glycidyl methacrylate (GMA) in bulk by using spiropyran-based initiator, CuCl in combination with N,N,N’,N’’,N’’-pentamethyldiethylenetriamine (PMDETA) as catalyst. The resultant polymer was characterized by gel permeation chromatography (GPC) and 1H NMR spectroscopy. The relative molecular mass of PGMA can be changed by polymerization time. The resultant polymers have controlled molecular weight and low polydispersity. The present synthetic strategy provides a convenient and efficient method to synthesize mechanophore-linked PGMA which can be ulteriorly crosslinked to form thermosetting polymer networks.
Development of Metallurgical Processing Technology the Titanomagnetite Concentrate of the Tebinbulak Deposit
Authors: Dmitriev Andrey N. , Sheshukov Oleg Yu. , Gazaleeva Galina I. , Chesnokov Yury A. , Bratygin Evgeniy V. , Nekrasov Ilya V. , Vitkina Galina Yu.
Published: October 2014

The approach to solving the problem of processing iron ore raw materials of Tebinbulak titanomagnetite deposit (Uzbekistan) is offered. It can provide high-quality steel products. The two schemes of processing of Tebinbulak ore are shown. The choice between the proposed schemes of the Tebinbulak ore processing: variant of "blast furnace – converter" and variant of "metallization – electric smelting" should be made after thorough analysis based on many factors.
Dyeing of Bamboo Viscose Fiber with Gardenia Yellow and Sodium Copper Chlorophyll
Authors: Zhang Jun , Xu Meng Xue , Chen Yan Juan
Published: October 2014

The dyeing process of bamboo viscose fiber with two vegetable dyes of Gardenia yellow (GY) and sodium copper chlorophyll (SCC) was studied. The optimum dyeing conditions in the absence of mordants were as follows: neutral medium; 70 °C for GY, and 80 °C for SCC. The trials of different mordanting methods showed that post-mordanting gave the highest color depth. Thus the effects of mordant dosage, temperature, pH and time for post-mordanting on the color depth of the dyed fiber were further discussed. The satisfactory effects were achieved in the case of low mordant dosage, low temperature, and neutral medium for GY dye, whereas the opposite conditions should be applied for SCC dye.
The Preparation Process and Mechanism of the Iron-Red Fancy Glaze under High Temperature Reducing Atmosphere
Authors: Shi Xiao Tao , Zhang Ting
Published: October 2014

Based on the research of the split-phase glaze in the CaO-SiO2-P2O5 series ,this thesis analyzes and discusses the effects of glaze’s formula and firing condition on the making of iron-red fancy glaze, and then comes to an scientific way to make bright-coloured iron-red fancy glaze with homogeneously-distributed crystalline under a wide range of temperature.
Large-Scale Growth of Nitrogen-Doped via Solvothermal Synthesis
Authors: Chen Xian Lan , Wu Na , Gou Gao Zhang , Shi Ling , Pan Shan Qin , Liu Wei
Published: October 2014

Theoretical studies predicted that doping graphene with nitrogen can tailor its electronic properties and chemical reactivity. We develop here a novel method for synthesis N-doped graphene via solvothermal synthesis process with urea as both reductant and nitrogen sources. The resulting N-doped graphene were characterized by various methods (UV-vis spectra, SEM and XPS). XPS analysis shows a predominant graphitic C 1s peak at ca. 285 eV, an O 1s peak at ca. 532 eV and N 1s peak at ca. 410 eV. Moreover, the atomic ratio of N/C is 5.0% for N-doped graphene, demonstrating nitrogen species have been successfully incorporated into N-doped graphene.
Evaluation the Strength of Cement Systems, Modified by Accelerators
Authors: Adamtsevich Aleksey , Pustovgar Andrey , Pashkevich Stanislav , Eremin Aleksey , Zhuravlev Andrey
Published: October 2014

Nowadays, there is a great demand for the accelerated hardening construction mixtures. That causes the necessity to the methods development for testing the effectiveness of accelerators, well as the analysis of kinetics of cement systems hydration in the early stages of hardening. This paper presents the results of an experimental research of interrelation between the growth kinetics of cement-based binder system strength and the heat release for pure cement hydration. How it was found, two compositions of construction mix, which are identical in mineral composition and differ in the presence of mono-functional accelerator, a comparison of strength growth dynamics can be carried out indirectly via the integral curve of heat release, obtained using the method of isothermal calorimetry.
Experimental Study on Seismic Performance of AAS-CFST Column
Authors: Chen Wen Feng , Yuan Xiao Hui , Li Bin
Published: October 2014

Three model specimens of alkali-activated slag concrete filled steel tube (AAS-CFST) with different axial compression ratio and steel ratio were designed and tested in the present study. The seismic performance of the structures were evaluated by testing them with combined lateral constant compression and vertical cyclic loads. The structural performance, such as the testing observations, hysteretic behavior, skeleton curve, stiffness degradation, energy dissipation capacity and ductility performance was discussed in detailed. The results show that all the specimens’ damage were bending deformation mode, and the hysteretic curves are relatively smooth. Test data indicated that increased the axial compression ratio improved the load bearing capacity, initial stiffness.
Mathematical Modelling of Thermo-Hydro-Mechanical Behaviour for Concrete under Elevated Temperature
Authors: Zhang Shao Bo , Wang Xiao Chun , Shen Xin Pu
Published: October 2014

A hydro-thermo-mechanical model was presented for concrete at elevated temperature. Three phases of continuum were adopted in this model: gaseous mixture of water vapor and dry air, liquid water, and solid skeleton of concrete. Mass conservation equations, linear momentum conservation equation, and energy conservation equation were derived on the basis of the macroscopic Navier-Stokes equations for a general continuum, along with assumptions made for the purpose of simplification. Mathematical relationships between selected primary variables and secondary variables were given with existing data from references. Specifications of the constitutive relations were made for the kinetic variables and their conjugate forces.
Study of N-1L Corrosion of Carbon Steel in Acidic Desulfurizer Performance
Authors: Wang Shi Dong , Wang Qiang , Li Jing , Zang Shu Liang
Published: October 2014

This paper uses a metal hung weight loss method, acidic ionic liquid desulfurizer as the media, by adding different inhibitor (Polyethylene Glycol, SDBS, Functional ionic liquids), contrast to carbon steel corrosion in the absence of inhibitor, understanding of their respective inhibition effect. In the experiment, the carbon steel material, different kinds and concentrations of the inhibitor in the medium, the corrosion rate measured by weight loss method. Contrast to the blank experiment the inhibition rate can be calculated. The experiment proved that the inhibition effect of several inhibitor at room temperature, and calculate their respective optimal concentration. The experiment also investigated the compound of several corrosion inhibition synergies, confirm the good corrosion inhibiting effect of polyethylene Glycol and SDBS complex, the inhibition rate reached 69.2%.Excellent inhibition effect of the ionic liquid corrosion inhibitor and the inhibition rate reached 88.3%, showing a clear advantage.
Performance of Acrylic in the Large Architectural Installation
Authors: Li Lin Xue , Qian Ren , Li Ao
Published: October 2014

This paper studies the essential attributes of acrylic from the perspective of material innovation and performance. The paper extends the structural performance of Acrylic with the technology of digital construction. It proposes a new possibility of utilizing acrylic and expatiates on the tendency of the use of acrylic in large architectural installations with practice cases.
Research on the Effect of Prehydration of Portland Cement Stored in Normal Conditions
Authors: Adamtsevich Aleksey , Eremin Aleksey , Pustovgar Andrey , Pashkevich Stanislav , Nefedov Sergey
Published: October 2014

This article is a stage of the author’s research into the impact of different factors on the hydration of mineral binders. The problem of cement activity decrease due to adsorption moisture influence during long-term storage in normal conditions (20°C and 50% RH) was examined. The influence of storage period in airtight and non-airtight conditions on the kinetics of heat evolution during hydration as well as on phase composition of Portland cement was characterized using experimental methods.
The Research on the Hysteresis Curve Shape Characteristics of Frozen Soil
Authors: Cui Ling Zhi , Li Gao Min , Qiu Li Dong , He Yi Ting , Mao Lei , Luo Fei
Published: October 2014

Under the effect of periodic cycle load, the frozen soil exists hysteretic characteristics. According to the research, the five parameters which are the residual strain , the numerical of short axis to long axis of the hysteretic curve , the slope of the hysteretic curve long axis k, the distance of adjacent hysteretic curve center point d and the area surrounded by hysteretic curve S are used to quantitatively represent the morphological characteristics of the hysteretic curve. The hysteretic curve of frozen soil is not a standard ellipse. Its morphological characteristics relate to the initial loading position. The morphological characteristics of the hysteretic curve of different soil affected by frequency, confining pressure and dynamic stress amplitude are different.
Mechanism Research of Drying Shrinkage of Cement Pastes Based on the Contact Angle
Authors: Song Kai Wei , Chen Guo Fu , Zhang Hang , Shi Cong Li , Yang Jia
Published: October 2014

Capillary tention is one of the driving forces of shrinkage of cement-based materials, which is related to distribution of pore size, surface tension of pore water, contact angle of pore walls and so on. There are some appropriate test methods for pore diameter and surface tension of cement-based materials, but the contact angle of pore water is rarely related to. This paper showed a new method to test the contact angle of cement-based materials which is based on the principle of thin-layer wicking about surface physical chemistry. Combining Washburn equation x2=(Refft/2) , the contact angle of analog pore solution to cement paste was obtained. The influence of superplasticizers and mineral admixtures on the contact angle and drying shrinkage of cement pastes also were researched. The results showed that the larger contact angle leads to the smaller surface tension of pore solution, which also caused that the capillary wall wass infiltrated more difficultly. As a result, the pressure of pore and the drying shrinkage were both small, vice versa.