bluuebunny/crossref_metadata_2025 huggingface dataset:
NUMERICAL ANALYSIS OF ASPHALT MIXTURE AND COMPARISON WITH PHYSICAL MARSHALL TEST
Authors: Rimša Vytautas , Kačianauskas Rimantas , Sivilevičius Henrikas
Published: July 2014

This paper addresses simulation of asphalt on the macroscopic scale, using the Discrete Element Model (DEM). Asphalt mixture is considered as a particulate solid composed of relatively stiff deformable layered spherical particles embedded into a homogenised matrix. The discrete model presents a 3D network of one-dimensional elements connecting particle's centres and comprising mutual interaction of particles. The contribution of the film layer and the interface thickness for normal stiffness is described analytically and illustrated by simulation results. Development of the normal interaction model of layered particles contacting via interface on the meso scale is the key point of the current development. The model applied aiming to simulate deformation of asphalt mixture is able to capture properties of the weaker matrix interface while layered particle comprises of bitumen film in meso scale. The developed technique is applied for simulation of Marshall test, i.e. diametric compression of cylindrical specimen, widely used for characterisation of asphalt mixtures. Finally, suitability of the model is illustrated by comparison with the available experimental results.
IMPACT OF GRANULES FROM CRUSHED EXPANDED POLYSTYRENE PACKAGE ON PROPERTIES OF THERMO-INSULATING PLASTER
Authors: Šeputytė-Jucikė Jurga , Sezeman Georgij Arsenij , Sinica Marijonas , Kligys Modestas , Vaitkus Saulius
Published: July 2014

The paper deals with the use of lightweight porous aggregate, i.e. crushed expanded polystyrene package crumbs (EPSC) in the composition of thermo-insulating plaster. Its effectiveness is compared to that of spherical granules of expanded polystyrene – white coloured (EPS) and grey coloured (NEOPOR). The content of lightweight aggregate changed from 1.25 to 1.75 l/kg of dry mix. The investigation focused on properties of modified plaster, such as density, compressive strength, thermal conductivity and water vapour permeability. It was established that EPSC reduce density of plaster from 1350 to 530 kg/m3, improving such properties as thermal conductivity and water vapour permeability but decreasing compressive strength. In addition, the paper established the adhesion force of plaster (content of lightweight aggregate was 1.25 l/kg of dry mix) to ceramics, silicate and autoclaved aerated concrete masonry elements. The character of macrostructure of plaster was considered, as well as bonding with a coat of decorative paint. It was found that plaster with EPSC has similar properties to plasters with EPS and NEOPOR aggregates; however, in case of EPSC, the relative vapour resistance is better. The provided regression equations can be used for prediction of differently modified plasters.
STRESS FAILURE OF CEMENT CONCRETES UNDER COMPRESSION – SYNTHESIS OF KNOWLEDGE, CONCLUSIONS
Authors: Gorzelanczyk Tomasz , Hoła Jerzy
Published: July 2014

This paper presents a synthetic review of the existing knowledge on the stress failure of cement concretes under compression, based on the available literature and the authors’ own research. It is pointed out that there is no knowledge on the stress failure of new-generation concretes, which needs to be acquired through proper research. The usefulness of the knowledge on the stress failure of concrete under compression for building practice is highlighted.
HETEROGENEITY IN FIRM PERFORMANCE DURING ECONOMIC CRISIS
Authors: Pittiglio Rosanna , Bruni Sergio , Reganati Filippo
Published: July 2014

What happens to firms during periods of deep economic crisis? Did different types of firms perform differently under the economic crisis? With the aid of a rich database and focusing on the literature regarding the growth of firms, this paper investigates the relative profitability performance of Italian firms during the current economic crisis, exploring those factors, which help certain firms to do relatively better even in the slowdown period. Some preliminary results show that the Italian firms that are relatively young in age, with relatively better current liquidity and more focused on domestic market have performed better than other firms. Furthermore, firms operating in high-tech and in highly concentrated sectors have enjoyed a better performance in this period.
FACTORS AFFECTING CUSTOMER SATISFACTION IN MOBILE TELECOMMUNICATION INDUSTRY IN BANGLADESH
Authors: Rahman Md. Hasebur
Published: July 2014

Identification of factors responsible for customer satisfaction is a key concern of marketing scholars and marketers in now a days and it will remain in the future. There is considerable evidence that quality factors affecting customer satisfaction in numerous ways. However, this empirical study is initiated to find out what particular factors responsible for customer satisfaction in the mobile telecommunication industry in Bangladesh. 282 samples have been collected through structured questionnaire; study reveals that service innovativeness, service reliability, service competitiveness and service consistency have significant influence on making customer satisfied and the operator’s network/signal coverage, pricing, offering, fulfillment of customer demand, value added service, brand value and operators contribution for society have insignificant influences on making customer satisfied at five percent level of significant at multiple regression analysis. On the basis of these findings; study concludes that in promoting customer satisfaction mobile service providers should be concerned for factors responsible for insignificant influence on customer satisfaction and care of those factors have significant influence on promoting customer satisfaction in telecommunication industry in Bangladesh.
Sobre las capitulaciones matrimoniales de Francisco de Goya y la prisa del aragonés en abandonar Roma
Authors: Gallego Raquel
Published: July 2014

El hallazgo de las capitulaciones matrimoniales de Francisco de Goya ha servido, entre otras cosas, para despejar algunas de las dudas existentes en torno a la permanencia del pintor aragonés en Italia. El estudio pormenorizado de uno de los documentos que las integran, que no ha sido transcrito hasta el momento, podría arrojar interesantes datos acerca de la premura con que debió tener lugar el regreso del pintor aragonés a España y de la manera en que Juan Adán y Manuel Eraso dieron su testimonio para que se pudiese celebrar el enlace entre Goya y Josefa Bayeu.
La neolitización del nordeste de la Península Ibérica: datos radiocarbónicos y culturales de los asentamientos al aire libre del Penedès
Authors: Oms F. Xavier , Esteve Xavier , Mestres Josep , Martín Patricia , Martins Haidé
Published: July 2014

En este trabajo se presentan datos inéditos acerca de tres asentamientos al aire libre situados en el llano prelitoral del Penedès (Barcelona) con ocupaciones del Neolítico inicial: el hábitat de Les Guixeres de Vilobí y las agrupaciones de silos-fosas de La Serreta y el Mas d’en Boixos. Se estudian sus materiales cerámicos y 5 fechas radiocarbónicas inéditas en el marco de la discusión sobre el Neolítico antiguo del nordeste de la Península Ibérica y de la neolitización del Mediterráneo occidental. Se propone que esta zona fue clave y con cierta densidad poblacional durante las primeras fases neolíticas y comparable a enclaves emblemáticos como el cercano valle del Llobregat (Garraf-llano de Barcelona y Vallès) o la zona alicantina. La antigüedad de las fechas obtenidas aporta nuevos datos al debate acerca del primer neolítico en la Península Ibérica.
Cronología absoluta del fenómeno campaniforme al Norte del estuario del Tajo: implicaciones demográficas y sociales
Authors: Cardoso João Luís
Published: July 2014

La complejidad del fenómeno campaniforme en el estuario del Tajo no encaja bien con el modelo de los tres Grupos sucesivos Internacional, Palmela e Inciso. Dicho modelo parece resultar de la naturaleza de los asentamientos más que de su cronología, ya que los tres grupos están presentes durante la segunda mitad del III milenio a.C. Mientras los artefactos del Grupo Internacional predominan en los sitios fortificados, los del Grupo Inciso se encuentran casi en exclusiva en yacimientos al aire libre. El Grupo Palmela parece menos importante, al menos en la región septentrional del estuario del Tajo. La notable antigüedad de la cerámica campaniforme hallada en la cabaña FM de Leceia (segundo cuarto del III milenio a. C., confirmada por datación AMS) tiene paralelos al Norte y Sur de Portugal, así como en España. En consecuencia, concluimos que en la Baja Estremadura (una de las regiones más importantes de Europa para discutir el origen y difusión del “fenómeno” campaniforme), la formación social campaniforme con sus características culturales distintivas coexistió con las culturas calcolíticas locales sin mezclarse nunca con ellas.
La presencia fenicia en la Península Ibérica: el Cabezo Pequeño del Estaño (Guardamar del Segura, Alicante)
Authors: García Menárguez Antonio , Prados Martínez Fernando
Published: July 2014

Este trabajo da a conocer los primeros resultados de la investigación de los autores en el enclave fenicio del Cabezo Pequeño del Estaño de Guardamar (Alicante). Dichos trabajos, consistentes en la revisión de los materiales exhumados en los años noventa y en el estudio arquitectónico con motivo de unas recientes tareas de consolidación, ayudan a definir más claramente el primer impacto de los agentes comerciales orientales en la costa levantina de la Península Ibérica y a comprender el desarrollo urbano del área del Bajo Segura que arrancó en época arcaica (siglos VIII-VII a.C.). El análisis de fotografías antiguas, anteriores a la destrucción parcial del enclave, ha permitido reconstruir su dimensión original (superior a una hectárea) y buena parte de su lienzo amurallado. Estos datos permiten considerar, además, el carácter urbano del yacimiento, anteriormente publicado como un pequeño fortín. En paralelo, los materiales arqueológicos procedentes de su última ocupación, fechados a finales del siglo VIII a.C., nos llevan a considerar que se trató del primer enclave colonial del Bajo Segura, abandonado en esas fechas por una población que se trasladó a un enclave de mayor tamaño y ubicado en mar abierto, conocido por el topónimo moderno de La Fonteta.
Los enterramientos neolíticos de Ca l’Arnella (Terrassa, Barcelona)
Authors: Pou Roser , Martí Miquel , Mozota Millán , Armentano Núria , Martín Patricia , Gibaja Juan F.
Published: July 2014

La prospección e intervención arqueológica en el yacimiento de Ca l’Arnella motivadas por las obras del gaseoducto Martorell-Figueres propiciaron la localización y excavación de dos hipogeos funerarios con inhumaciones individuales del Neolítico medio (finales del V milenio e inicios del IV milenio cal AC). Las estructuras, inhumados y materiales documentados son estudiados en este trabajo. Un geométrico hallado junto a las vértebras lumbares de uno de los inhumados pudo estar alojado en el interior del cuerpo y muestra estigmas típicos de su uso como proyectil, por lo que tal vez estemos ante una de las pocas evidencias de violencia durante este periodo. El análisis de los datos arqueológicos contextuales aportó varias líneas de evidencia que apoyan esta posibilidad.
Design and Implementation of a Stereoscopic Video Player for a Time-Division Display
Authors: Lü Chao Hui , Pan Jia Ying , Zhang Chen , Ren Hui
Published: July 2014

Three-dimensional video technology is becoming more and more popular, because it can provide a better natural depth perception. In this paper, a stereoscopic video player for a time-division display is designed and implemented, and people can use 3D Shutter Glasses to watch stereoscopic video by the player. It mainly focuses on the process of designing a Direct3D application, and the special handling of NVIDIA 3D Vision system for stereoscopic video. Upon examination, the stereoscopic video player can provide stereoscopic perception and good immersive experience.
A Test-Suite Reduction Approach for Improving Path-Based Fault-Localization Effectiveness
Authors: Gong Dan Dan , Su Xiao Hong , Wang Tian Tian , Ma Pei Jun
Published: July 2014

Path-based fault-localization technique is proved to be more effective than coverage-based fault localization because of analyzing the semantics of a program. Most previous work focused on investigating coverage-based test-suite reduction approach for fault localization. But it is not suitable for path-based fault localization, because it only analyzes coverage information, and does not take the execution path information of test cases into account. In this paper, we propose a test-suite reduction approach for path-based fault localization. This approach analyzes the concrete execution path of test cases. The experimental results show that the proposed method works well in improving the effectiveness of path-based fault localization.
Examine Factors Associated with Motorcycle Injury and Fatality
Authors: Cheng Li Ping , Wang Chen , Lu Jian
Published: July 2014

The objective of this paper is to examine contributory factors of motorcycle-related injury and fatal crashes and provide safety countermeasures and interventions based on modelling results. Motorcycle crashes, from 2007 to 2009, in Kentucky State were utilized as data source and two binary logistic models, for motorcycle-related injuries and fatalities, were developed respectively. Roadway conditions, roadway type, roadway alignment, gender, age, crash avoidance behaviors, airbags were found to be significant factors. Speed, curves, and crash avoidance maneuvers of braking and steering were found to be strongly correlated with motorcycle injuries and fatalities. According to modelling results, control of motorcycle access on interstate/state highways, roll stability systems, educational and training programs, usage of helmets, and deployment of airbags and anti-lock brake systems are suggested for motorcycle safety improvement.
Research on High-Speed Railway Line Selection Based on Analytic Hierarchy Process
Authors: Zhang Feng , Wang Xin Di , Sheng Fu Shen
Published: July 2014

This paper mainly introduces the use of judgment and the decision-making process of Analytic Hierarchy Process (AHP) to solve the choice of railway line. From the aspects of economy, technology, environment and society, we determine the factors that influence the selection of railway line. Through the application of Analytic Hierarchy Process (AHP), we analyzed the problems.
The Application of the Expert Help System Based on Training of Metro Vehicle Driving Ability
Authors: Yang Ping
Published: July 2014

The employee requirement of urban rail transit professional graduates is increasing year by year. Under this new situation, in 2012 BEIJING POLYTECHNIC recruited the first batch of urban rail transit vehicle professional "order class" students in cooperation with the Beijing Metro Operation Co. Ltd. In professional teaching, to enhance the students' ability of metro vehicle driving the teachers have introduced the expert help system of situational teaching in the vehicle driving simulation platform.The application results are obvious. It fills the gap of finishing the vehicle driving simulation teaching, training and test at a time in the domestic urban rail training, hasing profound significance.
Analyses on CT Image of Gray Rock Uniaxial Compressive Failure Process Based on MATLAB
Authors: Wang Wei , Liu Jing Hong , Shi Pan Fei
Published: July 2014

The uniaxial compressive failure process CT images of gray rock were analysised based on Matlab. Matlab is used to transfer gray rock CT images into gray histogram which can be observed directly so as to see clearly the damage evolution process of gray rock under loading. By comparison, gray histogram is consistent with the result presented by original CT image. The gray histogram equalized by Matlab can show clearly the change trend and process of gray rock internal defects and micro cracks. Gray histogram is a good method to observe and analyses CT images.
Behavior of Square Hollow Section Steel Tubes Filled with Concrete under Different Loading Conditions
Authors: Jin Tian De , Guo Lan Hui
Published: July 2014

In this paper, the behavior of composite stub columns under different loading conditions is studied using the finite element method. The accuracy of the theoretical method is validated by comparing with the experimental results. The behavior of specimen under different loading conditions is analyzed. Then, based on the finite element method, the comparison of mechanical behavior under three typical loading conditions is studied. The results show that the difference on bearing capacity will become larger with the increase of steel area to concrete area ratio. For the core concrete loaded specimen with lower steel area-to-concrete area ratio, whose bearing capacity is the lowest, but its ductility is very good. With the increase of the steel yield strength, the bearing capacity will increase evidently for specimen loaded simultaneously. While for the specimen with only core concrete loaded, the steel yield strength has little influence except increase of ductility.
Detecting the Defects in Concrete Components with Impact-Echo Method
Authors: Liu Jing , Xie Jun , He Xiao Yu , He Yu Shan , Zhong Jia Hui
Published: July 2014

With the large-scale application of the prestressed concrete structure, the quality of the concrete component defects and pipeline grouting has increasingly become the focus of attention. The impact-echo scanner uses the nature of wave, which pass though different media at different velocities, to distinguish internal defects of concrete, pipe filling density and so on. In this paper, using the impact-echo method to detect the concrete block with prefabricated defects of shape, location, and size explores the effect of defect properties, parameter settings and detection environment to impact-echo preliminarily and also explores the relationship of pipeline filling status and impact-echo image. Based on this study, the article raised the problem met during this non-destructive testing methods applied to engineering, and accumulated a certain amount of available engineering data. The experiment results show that using the impact-echo method to identify the defects of concrete components and to test the quality of pipeline grouting is a more convenient and effective non-destructive testing method. Especially, with the radar method in the pipeline grouting quality inspection which complement each other to make up for the shortcomings the lightning wave in case of the metal medium total reflection phenomenon, cannot detect metal pipe grouting plumpness.
Foundation Pit Deformation during the Excavation and Simulation
Authors: Ren Bai Cheng
Published: July 2014

Based on the background of foundation pit excavation of a village, the process of excavation is simulated by FLAC3D .And the calculation and analysis is combined with the engineering practice. The results show that the deformation of foundation pit is mainly composed of ground surface settlement, and the maximum deformation occurred in the middle of the pit wall at the top of the part. The surface subsidence with the ongoing of the excavation, the general surface subsidence trend is rising. When it comes to the foundation pit, when the settlement velocity is very large, the foundation turns to be unstable, which need supporting methods. Flac3D program applied on the excavation of rock and soil deformation law study is feasible. The result of the study to further relevant basis are provided for the practical engineering and have certain practical application value to the rock and soil deformation in the process of excavation research.
Stability Analysis of Tunnel during the Excavation Based on ANSYS
Authors: He Bing , Yin Guang Zhi
Published: July 2014

This paper combines the geological condition of Miaoziwan tunnel and numerical simulation software ANSYS to analyze the displacement and stress condition of surrounding rock before and after the excavation. Furthermore, the stability of overlying rock in the tunnel was studied based on the displacement and stress condition of surrounding rock. The breaking law of overlying rock was studied considering the influencing factors to the stability of surrounding. The study and analysis to the breaking law of overlying rock can be helpful to the improvement of surrounding rock stability control and supporting system. Moreover, the result can be the guidance to the excavation.
The Thickness of Immediate Roof and Surrounding Rock Control Theoretical Research
Authors: Sun Wei Fang , Bian Xi Chun , Qi Xian Yin , An Wei
Published: July 2014

Somewhere on the specific geological conditions of surrounding rock, adopt the different method, calculates the thickness of immediate roof in the area, the thickness of immediate roof was got, which to explore the suitable method for formation conditions of pressure control method, good effects have been achieved.
Damping Control Study on Concrete Filled Steel Tube Frame Structure with Viscous Damping Walls
Authors: Zhang Shao Xian , Ren Yi Lei , Han Wen
Published: July 2014

In this paper, using the Sap2000 analysis software, established the analysis model of high-rise reinforced concrete filled steel tube frame structure, in allusion to the damping effect in different number, different layout and different spectral characteristics, and carried out the optimization of damping wall configuration scheme. According the calculations, comparing the influence of seismic performance between the original structure and after optimization of concrete filled steel tube structure in the condition of earthquake, the results showed that the viscous damping walls in the structure damping control effect is obvious.
Tunnel Reliability Analysis Based on the Combination of Modified FOSM and Numerical Calculation Program
Authors: Chen Li Hong , Chai Xiao Bing , Fan Hai Zhu
Published: July 2014

Evaluate the reliability for the deformation of structure is a hard work. Usually stochastic finite element method or response surface method was adopted. In this paper, a new way by combining of numerical method and modified reliability analysis method is proposed. The modified first order second moment method (FOSM) was introduced and three examples are employed to verify the feasibility and the effectiveness of this method. The examples showed the modified FOSM had the advantage of faster convergence rate, higher calculation accuracy in comparison with FOSM, response surface method and optimization algorithm method. Combining finite element method program with modified FOSM method is applied to analyze the reliability index of deformation of a tunnel. The results showed this approach was a successful method to analyze the reliability of complex structure.
Analysis of Regional Distribution and Change of Tropospheric Delay
Authors: Wang Hai Shen , Shi Chuang , Cao Yun Chang
Published: July 2014

In this article, data of stations distributed over China was used to calculate tropospheric delay. The result was compared with the tropospheric zenith delay calculated from model. The rules and Characteristic of tropospheric delay over China was analyzed from the aspect of altitude, climate, and change. The results showed that the tropospheric zenith total delay decreased from the coast to the central and western regions, the Tibetan plateau is minimum. Zenith wet delays computed from the models also show an absolute bias of over 20 mm with respect to that of sounding data. The standard deviation is more than 30 mm in the tropical monsoon zone.
Comparison of Sound Propagation Characteristic between Deep and Shallow Water
Authors: Liang Zhang , Meng Chun Xia , Xiao Hai Tao
Published: July 2014

The physical characteristics are compared between shallow and deep water, in physics and acoustics, respectively. There is a specific sound speed profile in deep water, which is different from which in shallow water, resulting in different sound propagation law between them. In this paper, the sound field distributions are simulated under respective typical sound speed profile. The color figures of sound intensity are obtained, in which the horizontal ordinate is distance, and the vertical ordinate is depth. Then we can get some important characteristics of sound propagation. The results show that the seabed boundary is an important influence on sound propagation in shallow water, and sound propagation loss in deep water convergent zone is visibly less than which in spherical wave spreading. We can realize the remote probing using the acoustic phenomenon.
Near-Surface Multi-Point Vibration Location Method Based on Seismic Depth Migration
Authors: Xu Shan Hui , Guo Jian , Li Pei Pei
Published: July 2014

This paper presents a method for multi-point vibration location near-surface. Unlike traditional source location technologies, it is not using travel times of seismic waves for positioning calculation, but according to the entire seismic data record, using the wave equation migration method to calculate the source location. Similar to exploration seismic, the records from a survey line within a certain period of time are data volumes with dimensions of time and ground coordinates. Based on the data, combined with surface seismic wave propagation characteristics, by using the improved seismic depth migration algorithm, the vibration energy will return to the starting position where exactly the source location is. The method can solve the problem of location calculation error by using traditional method when several vibration at the same time or continuous vibration occurs at some point.
Numerical Measurement and Data Processing of Air Pollution
Authors: Li Fan Xiu , Wen Xing Ping , Yi Shao Jin
Published: July 2014

Relational analysis method was a data process method used to sort out the correlation extent of effect factors in a system with uncertain information. Common mathematical methods were not applicable for describing the relationship. A new method, equivalent numerical relational degree (ENRD) model was developed to evaluate the effect of different factors on air pollution. The effects of different factors-the port throughput, amount of coal, industrial output, and motor vehicle ownership, investment in fixed assets, real estate development and construction of housing construction area on the quality of atmospheric environment were studied. The degrees of correlation were calculated according to ENRD and the values of the port throughput, amount of coal, industrial output, motor vehicle ownership, investment in fixed assets, real estate development and construction of housing construction area were 0.7947, 0.7943, 0.7289, 0.7238, 0.6702 and 0.6527, respectively. From these values, the relations of these factors to the quality of atmospheric environment could be described and evaluated, and the port throughput and amount of coal were relatively major.
A Portable Electroencephalogram Recording System for Rats
Authors: Zhang Dian , Wang Bo , Qin Qing Liang
Published: July 2014

A wireless portable electroencephalogram (EEG) recording system for animals was designed, manufactured and then tested in rats. The system basically consisted of four modules: 1) EEG collecting module with the wireless transmitter and receiver (designed by NRF24LE1), 2) filter bank consisting of pre-amplifier, band pass filter and 50Hz trapper, 3) power management module and 4) display interface for showing EEG signals. The EEG data were modulated firstly and emitted by the wireless transmitter after being amplified and filtered. The receiver demodulated and displayed the signals in voltage through serial port. The system was designed as surface mount devices (SMD) with small size (20mm×25mm×3mm) and light weight (4g), and was fabricated of electronic components that were commercially available. The test results indicated that in given environment the system could stably record more than 8 hours and transmit EEG signals over a distance of 20m. Our system showed the features of small size, low power consumption and high accuracy which were suitable for EEG telemetry in rats.
System Identification of Beating Heart Medical Surgery Assisted Robot
Authors: Liang Fan , Yang Li Li , Cui Shi Gang , Zhao Li , Wu Xing Li , Tian Li Guo
Published: July 2014

The wide bandwidth and high amplitude feature of the beating heart motion makes surgeon hard to achieve the coronary artery bypass graph surgery on his or her own. The robot could help to cancel the relative motion between the end effecter of the robotic tool and certain point on the heart surface. Therefore a stationary operation screen could be used for the surgeon. The precise robot modeling is the prerequisite for tracking control algorithm. In the paper, we process the input and output data by using the nonlinear optimization method to obtain the system model. Next, we discuss the system identification related problems and modify the model. Finally, a good system model is achieved.
Forecasting Technique for the Production Plan of the Local Earthenware Industries of Thailand
Authors: Namboonruang Weerapol , Amdee N
Published: July 2014

The purpose of this work is to compare the forecasting of time series models between two different models. One is the classical model and another is the Box-Jenkins model. The data are calculated using the circulation of Angbuaand Ahongwhich are the local earthenware products from Ratchaburi province, Thailand. Results show that the mean absolute percentage error (MAPE) of Angbua and Ahong are 17.80, 36.12 and 16.38,17.21 respectively. Also,prediction using the Box-Jenkins Model by ARIMA form of both products are (1, 0, 0) and (1, 1, 1). From this work the Box-Jenkins Model shows more appropriate method than the classical model considered by the less error.
Study on Private Pilot Error Prevention Theory Based on Rough Set
Authors: Li Wei Min , Yang Yue , Tao Zhi
Published: July 2014

The paper studies on the theory of Private Pilot Error Prevention aiming at its peculiarity of operation and is based on the experienced data being evaluated by the resourceful pilots. Data Resource of Prevention Rule integrated analysis is proposed which using the two data sources from the civil aviation flight terms and the questionnaire from resourceful pilots. Knowledge Reasoning of Private Pilot Error Prevention Rules mainly analyzes that the requirement of traditional civil aviation flight terms include the experience from resourceful pilots, it is useful to represent information form meeting rough set requirements, these transversion need to go through complex bureaucratic procedures.
Analysis of Hydraulic Jarring Dynamics and Calculation of Impact Force
Authors: Yin Hu , Luo Neng , Li Qian
Published: July 2014

Drilling jar is widely used to solve the stuck pipe incidents in the drilling process. Impact force which is being made during the jarring operation is acting on stuck point to achieve unfreezing effect. Conventional hydraulic dynamic load calculation method is not considering the impact of friction force on stress wave spreading in drill string. In actual process, friction and viscous resistance caused by the movement of drill string in drilling fluid, making drill string acceleration process exhibiting damped vibration characteristics. Therefore, with the drill string damping vibration theory, analysis of dynamics of acceleration process can be made, and displacement and velocity equation in longitudinal acceleration process can be deduced. Thus the maximum velocity of drill string before collision has been calculated, and impact force acting on the stuck point has been deduced with the law of conservation of energy and momentum. The model of impact force calculation is more satisfied with actual environment in the wellbore during jarring operation.
Study on the Product Development Process Based on WITNESS Simulation
Authors: Chen Yan Hai , Li Hai Feng , Qiu Fu Shang , Xu Jing , Feng Zi Tong
Published: July 2014

The differences of development cycle between product serial and concurrent development process are obtained through simulation in this paper, which implies the importance of rational planning in the process of product development. The models of product serial and concurrent development process are built based on witness. Three types of models for both simple and complex products have been made respectively to simulate ,and then compared results have been got under six different conditions . Among six situations, the results of four are that the time of concurrent process is much shorter than that of serial process; one is that the time is very close; another is that concurrent process is much longer. We draw a conclusion that product development process must be rationally planned in order to shorten the development cycle for some complex products.
The Enterprise Information System Application Platform Architecture and Key Technologies of the Complete Sets of Electrical Appliances Enterprise
Authors: Guo Xiao Jun , Yin Ying
Published: July 2014

This article analyzes the characteristics of complete sets of electrical appliances enterprise production and the current situation and the demand situation of enterprise information application, points out that the complete sets of electrical appliances enterprise information platform should be based on product data management, including CAX/CAPP/PDM/ERP integrated application platform. In this platform architecture, information integration of product data management is responsible for the management of design and process, generate BOM design and process of BOM, form the basis for ERP data, and ERP is responsible for the order of the original information input, logistics and cash flow. Using the corresponding interface design, PDM and ERP will keep database exchange of information. In the J2EE platform, establish the enterprise PDM and ERP system prototype. In system implementation, the phases of the modular structure, construct the enterprise information platform of the system. As to demonstrate the application, in a relatively short period of time, complete the implementation of a complete set of electric enterprise information system, and achieved remarkable results.
Application of CAN in Lifting and Sliding Mechanical Parking Garage
Authors: Sun Peng , Shi Jin Shui
Published: July 2014

Nowadays, as a result of the serious shortage of parking spaces in major city all over China, people often feel it’s difficult to park their cars. Building mechanical parking garage has become an important way to solve this problem. Lifting and sliding mechanical parking garage is the most widely used mechanical parking garage. At present, lifting and sliding mechanical parking garage widely adopts centralized control system based on PLC. But there are several disadvantages in this kind of control system, suck as structural complexity, weak expansibility, and high cost. With the advantages of simple structure, strong expansibility, low cost and high reliability, CAN bus control system is widely used in the mechanical parking garage. The major mission of this paper is to study the control system of lifting and sliding mechanical parking garage based on CAN bus.
Finite Element Simulation of Front Suspension Lower Arm of MacPherson Type Based on ANSYS
Authors: Li Li Zhen , Song Zhi Feng
Published: July 2014

In this paper, the Xiali car Mcpherson type front suspension lower arm as the main research object, research the Xiali car converted to electric vehicles, the lower arm, internal stress distribution of structure on the lower arm, and on the basis of optimization design is carried out with ANSYS software. The last judgment andevaluation of prototype vehicle and electric vehicle arm stress, strain distribution and variation of structure on the lower arm, the topology optimization analysis is carried out, the lower arm to meet the strength and stiffness of the structure at the same time, meet the requirements of lightweight design.
Research on Abrasion Mechanism of Working Roll and Strategies of Anti-Wear in Tension Leveler
Authors: Chen Bing , He Ming Cheng , Lin Hai Hai
Published: July 2014

Combining with both working condition of working roll in tension leveler and wear classification, this paper maintains that abrasive wear is the main type of working roll’s abrasion, and states that shape defects of hot rolled strip is the main cause of the abnormal abrasion of working roll, and concludes that to reduce the wear of working roll relying solely on technology of tension leveling has its limits. So, combining with the materials of working roll in tension leveler and rolling mill, the surface hardness and the wear rates of different materials after heat treatment are experimentally analyzed to provide a theoretical guidance for the further improvement of working roll’s materials.
Study on Three-Dimensional Design of Crankshaft Piston Group of Diesel Engine Based on Pro-E
Authors: Shi Yan , Liu Yong Feng , Jia Xiao She
Published: July 2014

In order to establish a three-dimensional model of the crankshaft piston group, the paper puts forward the application of feature modeling method. This method is that the designers extracting the Boolean operation directly from the feature library formed the design and definition of the part model. The paper analyzes the contact between the crankshaft features and its expression, using the Pro-E to build the feature model of crankshaft and the piston-connecting rod group which based on the 4JB1 diesel engine, forming a three-dimensional assembly drawing which provides the new ideas for the design and manufacturing personnel.
Study on Time-Frequency Spectrum Characteristic of Dynamic Cutting Load Based on Wavelet Regularization
Authors: Liu Chun Sheng , Ren Chun Ping , Han Fei
Published: July 2014

Aimed at investigating time-frequency spectrum characteristic laws of conical pick rotary crushing coal and rock, this paper determines the mapping relationship of load spectrum between energy distribution and cutting process, and achieves quantitative reconstruction of the cutting coal and rock load spectrum. The experimental load spectrum is used as the object of research, utilizing wavelet regularization method to establish load spectrum reconstruction model of the pick cutting coal and rock, which will achieve its reconstruction load spectrum, so that it will discuss the variation of reconstruction load spectrum. Finally, it determines energy distribution of the load spectrum in different frequency band. The results show that the experimental load spectrum energy increases with the increasing of the cutting cycle number, and then decreases, so the characteristics of energy can characterize the cutting process. Energy of reconstruction load spectrum is mainly distributed in the low frequency range, which focuses on 1Hz and 3Hz, the amplitude of the high frequency energy is smaller than others.
The Damping Forced Vibration of Rectangular Stiffened Plates with Elastic Boundary Edges Including Boundary Damping
Authors: Zhang An Fu , Sheng Mei Ping , Xiao He Ye
Published: July 2014

The paper proposes an analytical-numerical method for damping forced vibration problem of the rectangular stiffened plates with elastic boundary restraints. By enforcing applicable continuity conditions between plate and beams, coupled equations of beams-plate system are established. The displacement function is expressed as a modified two-dimensional Fourier series, which converts the differential equations of plate-beam systems into linear algebraic equations. Furthermore, Rayleigh’s proportional damping is introduced into beams-plate system so that damping parameters of stiffened plate can be inserted into vibration equations. It is derived that the present method demonstrates good agreement with standard finite element analysis. In subsequent analysis, it can be found that the boundary damping can reduce vibration energy of stiffened plate to same extent.
The Influence of Bolt Layout Form to the Dynamic Stiffness of the Column
Authors: Shen Chen , Hua Zhong Ping , Zhang Meng Sha , Zhang Zhou
Published: July 2014

In the case of the column materials to determined, the lower natural frequency of column is determined by the number of coupling bolts and bolt arrangement. In this paper, by three-dimensional modeling software of Solidwork column model of hobbing is set up, then by using ANSYS finite element analysis software. The initial four order natural frequency to the different number of connection bolts and the different arrangement of bolt are respectively calculated. After the initial four order natural frequency are contrasted, we conclude that in the case of merely considering dynamic stiffness this study reach it is the most reasonable to select 8-12 bolts in the hobbing of YKQ31300, and different bolt arrangement of effects on the dynamic stiffness of the column is very small and can be ignored.
The Parametric Modeling of Hydraulic Turbine Based on Pro/E Secondary Development
Authors: Zhang Meng Sha , Hua Zhong Ping , Shen Chen , Zhang Zhou
Published: July 2014

In this paper, combining with PRO/E4.0 software, getting the general design idea of the hydraulic turbine, and aiming at systematic analysis and research the key technologies of development design system process of hydraulic turbine. The key technologies include the pro/toolkit interface technology, menu design MFC dialog box as well as the establishment and access of database. Based on the two modes’ characteristics of PRO/TOOLKIT application, determining to use the DLL mode of the synchronous mode for the system design model's mode; Combining with the structure of the main parts of the hydraulic turbine, aiming at the characteristics of the pro/toolkit interface technology, menu design and MFC dialog box ,concluded the development processes of the pro/toolkit interface technology, menu design and MFC dialog box; Combining with the PRO/TOOLKIT interface technology and the characteristics of technology of MFC dialog box, selected the required software which is used to create and access database, and the specific development process. This provides important technical Supports for design system of Hydraulic turbine's development.
Study on the Effect of Fuel Sulfur Content on Emission Characteristics in Diesel Engine
Authors: Wu An Kang , Yang Xiang Dong , Zhou Hua , Lu Ke Jiu
Published: July 2014

In a direct injection turbocharged diesel engine, four fuels with different sulfur content is used to study the effects of emission characteristics in diesel engine. Results show that the smoke emission have certain relations with sulfur content on fuel, the smoke emission decreases remarkably with the decreases of fuel sulfur content, and the sulfur content on fuel has a greater influence on the smoke emission at low load of the diese1 engine, the NOxemissions has no significant change when the engine fuelled with different sulfur content on fuel, while the CO and HC emissions will drop significantly.
Simulation and Experimental Study on Static and Dynamic Characteristics of Laterally Interconnected Air Suspension
Authors: Jiang Hong , Qian Kuan , Ju Long Yu , Cui Zhen
Published: July 2014

Laterally interconnected air suspension can further improve air suspension performance. This paper presents the mathematical model of full vehicle and the test bench for laterally interconnected air suspension is established. Simulation and experimental results indicate that acceleration of sprung mass is reduced by laterally interconnecting the left and right air springs, and the larger pneumatic pipe diameter is, the better damping performance of the suspension will be. Compared with the conventional air suspension, laterally interconnected air suspension brings better ride comfort and driving stability for vehicles on uneven road.
The Research on the Design and its Dynamic Characteristics of Shell and Tube Sewage Heat Exchanger
Authors: Feng Lei , Qin Na , Sun Dong Fang
Published: July 2014

According to the design parameter of practical engineering, shell and tube sewage heat exchanger is chosen as heat exchanger of secondary sewage-source heat pump system. This paper commences from the design calculation of shell and tube sewage heat exchanger, followed by the analysis of dynamic characteristics influencing rule based on the chosen size. The influence of inlet temperature and outlet temperature on tube temperature and the influence of signal curve of different inlet temperature on outlet temperature are all included.
Research on Emission Performances of Emulsified Diesel Oil with Diethyl Ether
Authors: Wu An Kang , Yang Xiang Dong , Zhou Hua , Lu Ke Jiu
Published: July 2014

Characteristics of diesel engine emission are studied on emulsified diesel oil with diethyl ether through elucidation on their mechanism of exhaust emission reduction. The amount of emission pollutants changes with various engine loads. Comparison is made on the emission effect of engines fueled with diesel oil and emulsified diesel oil respectively. Experiment shows that emulsified diesel oil with 10% of diethyl ether can significantly brought down the emission of NOx and smoke intensity on high load, particularly the emission of HC and CO on low load.
Structural Optimization Scheme for Horizontal Filtering Tank
Authors: Yang Ping , Qu Zhou De , Li Min
Published: July 2014

Based on the impact of some horizontal filtering tank’s instability in operation process on production, the present paper discusses the optimal design scheme for horizontal filtering tank structure with the help of finite element. Theoretical guidance will be given to enterprise from the perspective of finite element for the purpose of improving the horizontal filtering tank through constructing the finite element model for horizontal filtering tank with Creo parametric software, conducting simulation with workbench software[1] and finally arriving at the reasonable design scheme after analysis, thus avoiding the structural instability caused by the over-constraint of structural leg support beam and filter plate under-constraint.
A Energy Saving Control System of Mining Street LED Light Based on SCM
Authors: Hou Rui , Long Xu Ming , Liu Ming Xiao
Published: July 2014

An energy saving control system of Mining Street LED light is designed Based on SCM, improving the lights wastage in the process of coal mine production. The energy-saving LED is used suitable for the vehicle past situation and environment. The overall design and module analysis is described .The Practice has proved that the control system has a good economic and practical value designed by SCM as the core, LED light source as energy-saving lamps.
Modeling and Simulation of Single Screw Extruder Control System
Authors: Gao Yuan Lou , Wang Lei , Zhou Li
Published: July 2014

This article is mainly talking about a pressure control system designed for single screw extruder. In order to achieve constant pressure control of the head, we used fuzzy PID self-tuning techniques and Smith Predictor to control extrusion system and then we used Matlab Simulink toolbox to simulated control result. Simulation results show that the method achieve good control effect and meet the design requirements.
Study of Hoist Control System Based on Dual Three-Level Inverter
Authors: Wang Feng , Qiao Shu Yun , Zhang Xu Long
Published: July 2014

The double-fed control strategy for AC hoist motor is discussed in this paper. The AC/DC/AC power converter is adopted as main circuit. Three-phase neutral-point-clamped three-level rectifier is used as AC/DC link to realize unity power factor at grid-side, which reduces harmonic distortions. For the DC/AC inverter, three-level topology is used, which is controlled by stator-flux oriented vector control method. Meanwhile, energy flows in bidirectional way by back to back three-level power converter. The hoist motor control system obtains a high dynamic performance when stator side operating in unity power factor condition. The reliability and safety of hoist system is improved based on double PLC. The control system mentioned in this paper is being used to control a shaft hoist with a capacity of 260kW, and the power saving is remarkable.