bluuebunny/crossref_metadata_2025 huggingface dataset:
Torres Colón Madrid – España
Authors: Lamela A.
Published: July 2013

Torres Colón han introducido en España un nuevo sistema estructural, sólo aplicado hasta el momento en 17 casos en todo el mundo: el de la estructura colgada. Por su situación, en la confluencia de cuatro importantes vías madrileñas, y por las peculiaridades de su proceso constructivo, el edificio ha atraído la atención de los técnicos y del público no especializado.
La muy discutida diferencia de costes entre este procedimiento y el tradicional, estimada aproximadamente en un 10-15%, queda ampliamente justificada y compensada en este caso, hasta tal punto, que puede ser considerada como la única solución funcional posible, dada la naturaleza del solar, reducido de dimensiones e irregular, y el carácter de las torres proyectadas, de gran altura y escasa superficie en la planta tipo. La estructura colgante, apoyada en tierra exclusivamente por medio de un núcleo central de hormigón, permitió la instalación de rampas y plazas de aparcamiento en los sótanos, prácticamente imposibles de realizar en el caso de una construcción tradicional, y liberó a las plantas tipo de condicionamientos estructurales en la distribución interior, otorgándoles la diafanidad necesaria para la realización de un esquema de distribución flexible y variado, como el requerido por el funcionamiento de las oficinas para las que fue previsto.
Estructura de las Torres Colón - Madrid – España
Authors: Fernández Casado C. , Manterola J. , Fernández Troyano L.
Published: July 2013

Se describen en este artículo las directrices generales para la organización de la estructura de hormigón de este edificio singular, que ha venido impuesta por imperativos ineludibles de solar y máxima utilización de las plantas resultantes.
En primer lugar, se trata el problema específico, que son las torres colgadas y su comportamiento resistente, estudiando por separado sus elementos constitutivos: núcleo, cabeza superior o plataforma de cuelgue, tirantes, plantas tipo y movimiento de la cimbra. En segundo lugar se plantea la solución adoptada para la parte enterrada, y finalmente, se explica la zona intermedia prevista en el proyecto inicial, aunque no con su amplitud definitiva, que es la única parte que por razones que se justifican se ha resuelto a base de estructura metálica.
Colegio en Holyoke – Massachusetts, (EE.UU.)
Authors: Editorial Equipo
Published: July 2013

Este complejo universitario se caracteriza por un esquema de conjunto donde, a diferencia del tradicional campus norteamericano, los distintos cuerpos de construcción se concentran en tres niveles, desarrollados longitudinalmente y en forma escalonada, en las faldas de una colina, favoreciendo una interconexión rápida entre los distintos espacios y funciones.
La edificación fue prevista en dos fases distintas, de las que, hasta la fecha, sólo se ha realizado la primera, cuyo programa comprende: servicios universitarios con salas de clase, bibliotecas, oficinas de administración, etc., para 2.500 alumnos; servicios anexos de circulación y aparcamiento para 2.000 vehículos; campos deportivos y de atletismo; y centros culturales.
El esquema adoptado saca pleno partido de un terreno abrupto y rocoso, que ofrece, a cambio, un hermoso entorno natural. La concentración de las construcciones en las zonas desniveladas permitió conservar el terreno en su estado natural en la mayor parte del predio, aprovechándose las áreas de terreno planas para la localización de los campos de deportes.
El proyecto ha merecido diversos premios y menciones honoríficas de instituciones de arquitectura americanas.
Banca March - Palma de Mallorca - España
Authors: Lafita Pardo F.
Published: July 2013

No disponible
Estructura metálica del edificio social de la Mutua General de Seguros Barcelona – España
Authors: Busquets Xavier , Batanero Juan , Rodríguez-Borlado Ramiro , Martínez Lasheras Carlos , Martínez Lasheras Rafael
Published: July 2013

Se describe la solución adoptada para estructura de la Mutua General de Seguros, en la Diagonal de Barcelona. El edificio se compone de seis sótanos generales y dos bloques elevados, uno de trece plantas y otro de cuatro, debidamente enlazados por la segunda y tercera.
Los problemas planteados fueron de muy diversa índole: desde la sujeción de las pantallas de hormigón de las plantas enterradas, hasta la consecución de la máxima diafanidad —en todas las plantas de oficinas no existen soportes intermedios— en las plantas altas a base de pórticos de gran luz, compuestos de dos partes bien definidas (el pórtico de planta baja y el conjunto de las superiores) y acertadamente resueltos, desde el doble punto de vista estructural y estético.
Museo Nacional Aeroespacial Washington» (EE.UU.)
Authors: Hellmuth George , Obata Gyo , Kassabaum George
Published: July 2013

El año pasado se terminó el edificio que describe este artículo, situado en un emplazamiento privilegiado, en Washington, cerca del Capitolio y de la Galería Nacional de Arte.
Tiene un total de 26 salas de exposiciones con una serie de galerías, tres de las cuales son abiertas y acristaladas.
La estructura se ha realizado, en su mayor parte, a base de acero refractario, y las paredes están recubiertas con paneles de mármol.
Dispone de dos salas especiales: teatro-auditorio y espaciarlo, constituyendo un moderno edificio de rasgos singulares, resuelto con acierto, funcionalidad y belleza plástica.
Universidad de Leeds - Gran Bretaña
Authors: Chamberlin. Powell y Bon Arquitectos
Published: July 2013

Situado a 1.500 m del centro de la ciudad, el conjunto universitario de Leeds participa activamente de la misma. Concebido en la década de los 60, y construido posteriormente, este complejo arquitectónico se destaca por encerrar una propuesta de ciudad «ideal», perfectamente integrada en la ciudad «real» y sujeta en buena medida a sus mismas necesidades.
La alternativa de convertir a este conjunto universitario, con capacidad para 10.000 estudiantes, en un núcleo urbano arquitectónicamente atractivo, tropezó inicialmente con los condicionamientos surgidos del tráfico, circulación y estacionamiento de vehículos, correspondientes a la magnitud de la ciudad proyectada; impedimento que fue resuelto de forma adecuada mediante la organización de una red subterránea y superficial de circulación vehicular, que reserva grandes espacios verdes para la circulación exclusivamente peatonal, liberándola de la distorsión del tráfico rodado y proporcionándole el grado de tranquilidad y recogimiento necesarios a su función.
El gran «campus» se ve aquí subdividido en distintos núcleos ajardinados de dimensión más humana, enlazados entre sí, y en torno a cada uno de los cuales se agrupa una arquitectura homogénea y al tiempo variada, que rompe con el monolitismo convencional.
El problema de la determinación del contenido de cemento en morteros y hormigones fraguados
Authors: Calleja José
Published: July 2013

Se trata en este trabajo de señalar el campo y las condiciones de aplicación del método NELC 5.01-a) para determinar la dosificación de cemento en morteros y hormigones fraguados, a la vista de los nuevos tipos de cemento del vigente y reciente Pliego de Prescripciones Técnicas Generales para la Recepción de Cementos CBC-75).
Se señalan los grandes errores que se pueden cometer por una inadecuada aplicación del método, y se llama la atención sobre las posibles consecuencias.
Tratamiento de protección para tuberías de hormigón pretensado a base de resinas sintéticas (epoxi y poliuretano)
Authors: Soria Santamaría Francisco , Olaya Adán Manuel
Published: July 2013

Entre los distintos sistemas de protección contra el fenómeno de corrosión bajo tensión, se encuentran aquellos que tratan de impedir físicamente que el agente corrosivo llegue al acero pretensado. Este es el caso de las impermeabilizaciones mediante membranas a base de resinas sintéticas.
En el artículo se describen distintos ensayos a que deben someterse este tipo de membranas en lo que respecta al hormigón soporte. Es preciso, además, adaptarse a las particularidades propias del tipo de obra a que van destinadas. El objetivo de los ensayos ha sido el mostrar la idoneidad de resinas sintéticas de epoxi y de poliuretano, específicamente formuladas para unas funciones concretas.
Se establecen tres tipos de soluciones mediante el empleo de las citadas resinas, en el caso de protección, respecto a líquidos «agresivos» provenientes del exterior en conducciones de agua, sometidas a altas presiones, en tuberías de hormigón pretensado.
Asimismo se proporcionan detalles de una obra concreta, en la que se empleó una de las soluciones citadas.
Juntas de contracción en canales y depósitos de agua
Authors: Safránez Carlos
Published: July 2013

Vista la escasa información disponible sobre las juntas de contracción en canales y depósitos de agua, siendo indiscutible su gran importancia para la estanquidad de estas obras, se han expuesto, en forma sistemática, los datos considerados esenciales para enfocar debidamente el proyecto de las juntas.
Se han indicado los tipos de juntas más corrientes, ordenadas de acuerdo con su diseño y con el procedimiento empleado para su sellado, señalando sus características. Se ha tratado de la importancia primordial del diseño y de las dimensiones de las juntas en relación con su comportamiento.
En los proyectos de las juntas ejecutadas llama la atención la falta de una unidad de criterio sobre las exigencias y condiciones mínimas que deben reunir las juntas para cumplir debidamente con su misión.
Según lo demuestra la experiencia, los resultados obtenidos con las juntas de contracción en canales y depósitos de agua no son del todo satisfactorios. En un número bastante considerable de casos, ha sido necesaria la realización de reparaciones molestas y costosas para subsanar las deficiencias observadas.
Con el fin de mejorar esta situación, se exponen los distintos factores que intervienen en el comportamiento de una junta de contracción, y a los que hay que tener en cuenta al proyectar el tipo de la misma y sus dimensiones para asegurar su eficacia.
Technology and Second Language Writing
Authors: Yim Soobin , Warschauer Mark
Published: July 2013

This chapter aims to synthesize research on technology and second language writing through the lenses of three common and broad discourses surrounding literacy and technology: achievement, change, and power (modified from Warschauer & Ware, 2008). The authors discuss the meaning and relationship of each perspective to the field of technology and second language writing as well as provide an overview of recent research under each category. This framework-based analysis sheds new light on current research, offering researchers and teachers an opportunity to consider the weaknesses and strengths of each research focus as well as the gaps in the literature. Through examining the interwoven relationship between technology and second language writing under different perspectives, the authors ultimately aim to explore the ways we can maximize the educational benefits of technology use for non-native speakers of English.
Beyond Words
Authors: Smith Blaine E.
Published: July 2013

This review synthesizes and critically interprets the empirical research on adolescents’ multimodal composition practices across contexts. Along with presenting descriptive statistics characterizing the 76 studies reviewed (e.g., research designs, contexts, and types of multimodal products), qualitative coding revealed six main themes in research focusing on adolescents and multimodal composition. Sequenced according to prevalence, research has found that multimodal composition is: 1) engaging for adolescents, 2) a collaborative, social process, 3) particularly beneficial to “marginalized” adolescents, 4) involves overt instruction, 5) is scaffolded in a variety of ways, and 6) is a complex, recursive process. At a time when notions of composition are expanding—educators are trying to catch up and researchers have just begun to understand and theorize multimodal composition—this review offers a comprehensive look at what has been learned thus far and suggests implications for research and practice.
Examining 7th Graders’ Tablet-Created Screencasts to Promote Safe Driving
Authors: Castek Jill , Cotanch Heather
Published: July 2013

This study explores patterns emerging from 7th grade students’ digital multimodal compositions created in response to a service-learning project focused on safe driving. Through a descriptive content analysis of three case-study groups’ digital products, this chapter presents educators with tangible ideas of what the digital composition process can yield when students are offered multimodal tools for self-expression. Three themes, collaboration, experimentation, and choice, describe the classroom contexts that are supportive of students’ creation of digital screencasts. Findings suggest that collaboration engages students in a participatory culture that invites those students who may be less proficient with alphabetic writing but who have unique perspectives to share and rich ideas to communicate. This study stands as a useful starting point for guiding teachers toward ways to incorporate an expanded set of writing practices, including digital multimodal composition, that engage all students in finding their voice.
Re-Imagine Writing
Authors: Hundley Melanie , Smith Blaine E. , Holbrook Teri
Published: July 2013

In “Re-Imagine Writing: Multimodal Literary Analysis in English Education,” authors Hundley, Smith, and Holbrook discuss a study of the multimodal and digital composing practices of pre-service English teachers in a writing methods course and their struggles to redefine writing and to compose using multiple modes. As these pre-service teachers are part of a generation of students who are active consumers of digital media, their struggles highlight the disconnect between their literacy practices inside and outside of school.
Learning the Disciplinary Language and Literacies of Multimedia Composition
Authors: Kozdras Deborah , King James R. , Schneider Jenifer
Published: July 2013

In this chapter, the authors describe four adolescent students’ participation in a digital video summer camp. They describe the students’ acquisition of moving-image composition strategies and how these processes are connected to acquiring new vocabulary. The authors examine the camp practices through a lens of Cultural Historical Activity Theory (CHAT) and use this perspective to guide data analysis. Through observations, interviews, and videos, they identify the various activity systems necessary to teach filmmaking, and use examples from one group to illustrate how boundary crossings shift expertise to students. The authors describe the following: (1) the “third space” (i.e., between counselor and student motives), (2) “networked space” (i.e., among different multiliteracy systems), and (3) “shifted spaces” where boundaries are not just crossed, but actually create a shift in expertise or perspective. The authors discover a mediated learning approach that helps students effectively use filmmakers’ words as tools. The camp structure is a model of apprenticeship into a discipline through its language and multiliteracies.
Variant Logic for Model Driven Applications
Authors: Davis Jon , Chang Elizabeth
Published: July 2013

Customizing Enterprise Information Systems (EIS) scale applications can be very expensive, also incurring additional costs during their lifecycle when customizations may need to be re-engineered to suit each EIS upgrade. The ongoing development of a temporal meta-data framework for EIS applications seeks to overcome these issues, with the application logic model supporting the capability for end users to define their own supplemental or replacement application logic meta-data, as what the authors term Variant Logic, to become a variation of the core application logic. Variant Logic can be applied to any defined model object whether visual objects, logical processing objects, or data structures objects. Variant Logic can be defined by any authorized user, through modeling rather than coding, executed by any user as an alternative to the original application logic, and is available for immediate execution by the framework runtime engine. Variant Logic is also preserved during automated meta-data application updates.
Parameterized Transformation Schema for a Non-Functional Properties Model in the Context of MDE
Authors: García Gustavo Millán , Crespo Rubén González , Martínez Oscar Sanjuán
Published: July 2013

The integration between design models of software systems and analytical models of non-functional properties is an ideal framework on which lay the foundation for a deep understanding of the architectures present in software systems and their properties. In order to reach this integration, this chapter proposes a parameterized transformation for a model of performance properties derived from a system model in the MDE context. The idea behind a parameterized term is to leave open the transformation framework to adopt future improvements and make the approach reusable. The authors believe that this kind of integration permits the addition of analysis capabilities to the software development process and permits an early evaluation of design decisions.
Viewpoint-Based Modeling
Authors: Fischer Klaus , Krumeich Julian , Panfilenko Dima , Born Marc , Desfray Philippe
Published: July 2013

Viewpoint-based modeling is an important recent development in software engineering. It is likely to boost the wider use of modeling techniques because it allows the tailoring of existing tools with respect to the different stakeholders in software design. This chapter reports the results of the project ViBaM, in which viewpoint concepts are investigated. In doing so, the authors give an overview of the most important contributions from literature regarding viewpoint concepts, from which they derive the position that they take in the ViBaM project. After presenting ViBaM’s position, the authors derive features that they consider important for tools that support viewpoints. Afterwards, they present use cases, in which the viewpoint concepts are illustrated and discuss which of the viewpoint features are relevant in these use cases.
Analyzing Mobile Application Software Power Consumption via Model-Driven Engineering
Authors: Thompson Chris , White Jules , Schmidt Douglas C.
Published: July 2013

Smartphones are mobile devices that travel with their owners and provide increasingly powerful services. The software implementing these services must conserve battery power since smartphones may operate for days without being recharged. It is hard, however, to design smartphone software that minimizes power consumption. For example, multiple layers of abstractions and middleware sit between an application and the hardware, which make it hard to predict the power consumption of a potential application design accurately. Application developers must therefore wait until after implementation (when changes are more expensive) to determine the power consumption characteristics of a design. This chapter provides three contributions to the study of applying model-driven engineering to analyze power consumption early in the lifecycle of smartphone applications. First, it presents a model-driven methodology for accurately emulating the power consumption of smartphone application architectures. Second, it describes the System Power Optimization Tool (SPOT), which is a model-driven tool that automates power consumption emulation code generation and simplifies analysis. Third, it empirically demonstrates how SPOT can estimate power consumption to within ~3-4% of actual power consumption for representative smartphone applications.
Reform of Mechanical Shaft Sealing Self-Flush System of Petrochemical Hot Oil Centrifugal Pump
Authors: Liu Yan , Ren Jie Long , Cao Hui
Published: July 2013

Mechanical seal leakage of centrifugal pumps (especially hot oil pumps) is the main fault reason of the petrochemical equipments. The fuction of the sealing flush system is to maintain the mechanical shaft seal function correctly. The misconduct of flush system settings will directly lead to the failure of mechanical seal. In this paper, the problems are analyzed for the present mechanical seal flushing system. When the centrifugal pump is in a standby state, flushing system may not provide normal flush flow in self-flush plan. This may lead to surface fouling of the hot mechanical shaft seal, resulting in seal failure. Our research focus on solving these problems. The way is to change the source of flush fluid, that is to change the flush plan to external flush plan or toChange the fluid pipe position.
A Reformative Simulation Method of Motor Pole Core Vibration Characteristics
Authors: Ding Tian Hui , Chen Yun Hua , Tian Lei
Published: July 2013

As to directing motor design, it is very important to make sure that the motor’s forecast of vibration performance has reference value. So, it must need motor’s parts vibration characteristics simulation results are so close to their characteristics. This paper puts forward a new simulation method of motor pole core vibration characteristics, this method includes setting anisotropy material attributes multipartite, getting attributes parameters values which are based on recommended fitting curves, modeling and equating windings, equating dipping lacquer and so on. Combining with experiments, the new method is validated its availability.
Structure Optimization Design of Axial Flow Check Valve
Authors: Su Hua Shan , Yang Guo Lai , Zhang Li Qiang , Xu Min Ying , Li Ren Nian
Published: July 2013

In order to enhance the performance of axial flow check valve, the nozzle and disk structures are improved. Contrast four different kinds of valve structure by CFD and get the valve structure of minimum flow resistance. By UDF and dynamic grid technology the whole process of the valve opening is simulated and the motion characteristics of the valve are achieved. It can verify the dynamic characteristic of the valve is improved, and the relative error is less than 2%. By analyzing dynamic characteristics of different inlet pressure, the axial flow check valve with optimized structure has reduced flow resistance, improved stability and longer service life.
Study of Crack Initiation and Propagation in TBCs by Experiments and Extended Finite Element Method
Authors: Su Jing Xin , Ji Zhao Hui , Han Zhi Yong , Zhang Hua
Published: July 2013

CoNiCrAlY bond coat (BC) and top ceramic coating (TCC) was fabricated on the GH99 super alloy by high velocity oxyfuel spray (HVOF) and air plasma spray (APS), respectively. Thermal cycling treatment was applied to the thermal barrier coatings (TBCs). The cross-sectional images of crack initiation and propagation of TBCs after treatment were investigated by scanning electron micrograph (SEM), meanwhile crack initiation and propagation in TBCs were analyzed based upon ABAQUS software using extended finite element method (XFEM). The results show that, crack initiation and propagation can be easily traced via microscopy at the interface areas in TBCs; after thermal cycling treatments, the crack associated with the TCC/TGO interface morphology initiates at interface peak area and propagates along TCC/TGO interface with thermal cycles; the interface roughness affects the crack magnitude in length and width obviously, the rougher the morphology, the bigger the crack is; the XFEM is a novel and effective method to well predict the crack initiation and calculate the crack propagation, and simulation and experimental results fit well.
Identification Method of Low-Voltage Series Arc Fault Based on Harmonic Component Relative Change Coefficient
Authors: Ma Shao Hua , Guo Jia Wen , Bao Jie Qiu
Published: July 2013

Low voltage series arc fault is one of the main reasons caused the accident of electrical fire, so it is necessary to detect and identify the fault arc. The low voltage series arc fault is researched in this paper, current waves of some typical electric equipment under arc fault and normal operation are measured, and DFT transform of current waveforms are done by Matlab software, so that an identification method of low-voltage series arc fault based on the harmonic component relative change coefficient is presented in this paper. The simulation results show that this method can effectively identify whether the arc fault occur.
Diagnosis of Bearing Based on Probability Neural Network
Authors: Ao Yin Hui , Cao Bin , Wang Bao Sheng
Published: July 2013

It is important to monitor and diagnosis for the health of ball bearing. We use the wavelet package to decompose the vibration of running bearing. The energies in frequency domain are input into a probability neural network. The output of the neural network is employed to justify the health of bearing and detect locations of fault. The experimental shows a good result of this method.
Effects of Heat Leakage and Internal Irreversibility on Quality Factor of Thermoacoustic System
Authors: Fei Jin Hua , Wu Feng , Wang Tuo
Published: July 2013

The quality factor of the thermoacoustic system is calculated, considering the dissipations caused by viscous and thermal effects at the resonator walls, heat leakage and internal irreversibility. The quality factor was analyzed in several situations. And it was analyzed numerically with the stainless steel wire mesh as an example. It is found that the quality factor is increased monotonically with the resonant frequency, and decreased monotonically with heat leakage conductivity and irreversibility factor. The relationship between quality factor and the regenerator packing material was analyzed, it is found that quality factor is increased monotonically with porous materials characteristic factor. It is a certain theoretical significance for future research.
The Stress Calculating and Analysis of the Second HP Turbine Disc of a Certain Type of Aeroengine
Authors: Xu Ke Jun , Wang Yong Qi , Xia Yi Rui , Jia Ming Ming
Published: July 2013

This paper takes the 2nd HP turbine disc of an aeroengine as research object, construct its finite element model in software-Patran. According to the work environment of 2nd HP turbine disc, the boundary conditions of stress field analysis and temperature field analysis are confirmed. Based on the finite element theory of thermal analysis and structure analysis, we use finite element software-Nastran to analyze centrifugal stress and thermal stress. Numerical calculation method was used to fit the data and finally we got the thermal elastic stress field. According to the computed results, the life assessment points of disc were confirmed. The static strength of 2nd HP turbine disc was tested based on the EGD-3 criterion. All the work established the foundation for subsequent life analysis.
Numerical Analysis of Interpolation Vibration Spring Heat Exchange Tubes under Pulse Flow
Authors: Xu Jian Min , Hu Xiao Xia , Peng Kun
Published: July 2013

The effect of pulse flow on the performance of heat exchange tube with built-in spring was investigated using software FLUENT. The temperature field and pressure field under different pulse flow were obtained. Results presented that the average export pressure shows the same vibration period with that of pulse flow and the fluctuation amplitude increases with the increment of the frequency of pulse flow. Moreover, comparing with the case of steady flow, the thickness of velocity boundary layer decreases significantly and thus the heat transfer coefficient is enhanced greatly. Furthermore, the vibration amplitude of pulse flow has great effect on the heat transfer enhancement, while the frequency of pulse flow shows little influence on the heat transfer enhancement.
Flow Field Test and Analysis of KYF Flotation Cell by PIV
Authors: Shi Shuai Xing , Yu Yue , Yang Wen Wang , Zhou Hong Xi
Published: July 2013

KYF flotation cell is one of the most widely used flotation cells in ore dressing in China. To optimize its structure parameters further, Particle Image Velocimetry (PIV) test system is set up to investigate the flow field in KYF flotation cell. The test is carried out under water condition, taking fluorescence sphere (51.7μm in diameter) as tracer particles of flow field, and three regions of flow field in KYF-0.2 flotation cell are determined as following: half of the whole tank, the region between the impeller and tank bottom, and the region in space between stator blades. Velocity vector diagrams of flow field in three regions are plotted. The results show that there are the upper and the lower flow circulations in flotation cell with dead area at the corner of tank bottom, and the smooth and steady flow in space between stator blades. All studies above strongly support the optimum design for large scale KYF flotation cell.
The Fluid Field Analysis of Cyclone Desander
Authors: Yu Chi , Wang Gang
Published: July 2013

Cyclone desanding is the technology of separating the solid component from the slurry by centrifugal force, widely used in the oil and gas industry. This study is to design a type of cyclone desander as efficient desanding equipment, which can desanding by the liquid flow and need no any other auxiliary device. The cyclone desander can form forced swirl to separate the sand in the oil-water mixture. The separated sand would sink into the bottom of the well directly and the clogging would not occur. This type of cyclone desander can also reduce the wear and tear of the sand on the pump, extend the workover cycle and improve the efficiency of oil recovery. The numerical simulations for the flow in the cyclone desander are performed. The velocity distribution, the pressure distribution and the sand sinking conditions are acquired at different moments. From the results the in-depth analysis for the working conditions of the cyclone desander are performed to prove the .efficiency of the cyclone desander with simple structure, low energy consumption and high efficient desanding.
Cold Experimental Study on Furnace Slag of Opposite Firing Boiler Using Swirling Combustion
Authors: Wang Chun Yu , Li Min , Zhang Ying Shuai , Li Ling , Sun Lu Shi , Xie De Yong
Published: July 2013

This paper analyzes the problem of furnace slag on opposite firing boiler using swirling combustion. Through the cold test methods, the airflow structure of the burner is explored, the formation mechanism of furnace slag is explicated, therefore the solution is drawn up, the slag problem of boiler is eliminated, the safety of unit operation is improved.
Experimental Research of Acoustic Emission Features of Waveguide Rod in the Oil
Authors: Guo Fu Ping , Wang Da Cheng , Liu Wei , Duan Zhi Hong
Published: July 2013

In acoustic testing of special structures, waveguide rods are necessary to connect structure and sensors, also for some special ambient environment. In the paper, the waveguide rod is placed in oil to test the propagation of acoustic wave. The influence of the distance between rod and tank bottom is studied, also is the distance between the signal source in oil and rod bottom end.
Development and Experimental Research of Two-Way Impact Pneumatic Cylinder
Authors: Gai Chao Hui , Wang Cheng Gang , Xie Xiao Heng
Published: July 2013

Abstract—his paper has presented a design scheme of the new model of the impact pneumatic cylinder, and designed and analyzed the key part of the impact pneumatic cylinder ,such as direction-control valves, piston rod. Meanwhile, the experimental model-machine was manufactured and used for the test on the experimental platform. The numerous lifespan testing, based on simulation in the practical working environment, was conducted and we obtained the pressure variation in impact pneumatic cylinder, and concluded that the impact energy and working life could be dramatically improved.
Acoustic Emission Monitoring of Low Carbon Steel Corrosion inside and outside the Comparative Study
Authors: Li Wei , Wang Shao Fan , Jia Xin
Published: July 2013

This paper applied acoustic emission technology, monitoring low carbon steel uniform corrosion process, obtained low carbon steel corrosion acoustic emission signal in the process of uniform corrosion, And analyzed acoustic emission signal characteristics of the low carbon steel corrosion process applied the method combining characteristic parameters with wavelet packet transform, in the meantime combined the detection data of storage tank, Contrast acoustic emission signal characteristics of low carbon steel corrosion in experiment conditions and acoustic emission signal characteristics of storage tank corrosion in actual conditions, the result provides reference for acoustic emission research of low carbon steel uniform corrosion process and tanks online acoustic emission testing.
Modeling for Lithium Iron Phosphate Battery and its Simulation in PSCAD
Authors: Qi Lin , Zhu Yong Qiang , Wang Zhi Yu , Fu Chun Peng
Published: July 2013

This paper proposes an improved dynamic model of lithium iron phosphate battery, and shows the simulation results. The method takes into account the nonlinear characteristics of the battery charging and discharging, and changes the variation of battery resistance into that of voltage, which makes the simulation circuit simpler and easier to be implemented. Simulations examine the time-changing characteristics of the state of charge (SOC), depth of discharge and the current/voltage in the charge/discharge processes, as well as the relationship between voltage and SOC. The model has correctively shown the dynamic characteristics of lithium iron phosphate battery in our simulations.
Study on Fuzzy-PID Control Simulation of Diesel Engines Electronic Governor
Authors: Li Yan Qiang , Yao Zhi Gang , Xu You Lin
Published: July 2013

In this paper, two types Fuzzy-PID composite control methods were studied. The Fuzzy-PID alternately control and parallel connection control were simulated by MATLAB SIMULINK. The simulation conclusions were that Fuzzy-PID composite control effect was better than FUZZY control or PID control, and Fuzzy-PID parallel connection control effect was better than alternately control on diesel engine speed regulation.
Optimal Scheduling of Compressors Considering Linepack Storage in a Pipeline Network
Authors: Wang Gong Tao , Zheng Chen , Halimah Abed
Published: July 2013

This paper presents an algorithm using dynamic programming to solve the problem of opitimal scheduling of compressors considering the linepack storage in a pipeline network. Both centrifugal and piston compressors are modelled for power calculation. For a forecast profile of gas loads, a multi-stage problem is formed by discretizing the storage capacity of linepack and tank along the timeline, and then is solved by a dynamic programming to obtain optimal day-ahead schedules for each compressor. While creating the multi-stage data, constraints on compressors, stations (sources), and pipeline network are utilized to exclude infeasible paths, avoiding dimension disaster and ensuring the feasibility of the paths from the point of view of state transition. Case studies have been done on both simple and complex systems, and the results indicate the practicability of the proposed algorithm.
A New Stabilizing Controller Design Based on the Wireless Networked Control System
Authors: Guo Xiao Hua
Published: July 2013

In order to improve the performance of the network control system based on the wireless sensor networks, a multi-hopping wireless communication and their effect on network time-varying delay is analyzed, and a new stabilizing controller is proposed based on the a clientserver model in this paper. Using of the linear matrix inequality and switched control system theory to obtain the stabilizing conditions of the close loop control system and give the output feedback controller design approach. Preliminary experimentation indicates the rationality and effectiveness of the proposed control algorithm.
A Novel Dual-Galvanometers Control Card
Authors: Wang Zhen
Published: July 2013

Large format and multi-Galvanometers laser marking has been more difficult to deal with the problems in the field of laser marking. So the novel dual-galvanometers control card is proposed by the paper. The card received data from the computer marking graphics software by USB interface, and then decomposed coordinates in the FPGA. So it can ease realized format stitching by synchronous controlled dual-galvanometers. It also has no F-θ mirror deformation at the stitching due to adjustment the parameters of relative position between the two planes of motion. From the simulation results and experimental results, the card was proved to effectively meet the large-format laser marking applications.
Testing Device for High-Pressure Cylinder Based on Virtual Instrument
Authors: Chen Fei , Yue Ying Juan , Du Xiao Jun
Published: July 2013

In this paper, a testing device for gas cylinder, which is composed of PC, data acquisition card on USB bus technology and the application software compiled on the labVIEW platform, is designed on the basis of virtual instrument technology. The assembly and disassembly of the cylinder plug, weighing, temperature measuring, being irrigated upright, and hydraulic pressure testing are all realized. This device has been put into use with highly practical effect.
Theoretical Analysis of a New Intrinsic Fabry-Perot Interferometric Fiber Pressure Sensor Structure
Authors: Wang Ning , Fu Jian Bo , Li Xiao Xia
Published: July 2013

The theoretical model is got for a new intrinsic Fabry-Perot interferometric fiber pressure sensor structure fabricated by single mode and multimode fibers with different diameters. The pressure response curves are simulated by Matlab software. The analysis results showed that the pressure sensitivity decreased with the diameter of multimode fiber increased at some area, but the sensitivity begins to increase when the diameter value is more than critical point. The high sensitivity can be still got by increasing fiber diameter.
Nonlinear Control of SVG Based on Hamiltonian Energy Theory
Authors: Wei Yun Bing , Yang Wei Jie
Published: July 2013

Establish the practical mathematic model of Synchronous Generator in the static var generator (SVG) of single machine infinite bus power system. Based on Hamiltonian energy theory, the new nonlinear controller is designed between the SVG which is installed in the bus voltage of system and synchronous machine excitation. This controller directly use the energy as the storage function, compared to other nonlinear controllers, this controller has the advantage of the fast stability and the capability of quelling the disturbance. Since the nonlinear control structure retains all in this design, it does not need the linearization, the proposed SVG controller is more robust than linear control method. The simulation results show that the proposed controller can faster meet generator excitation and SVG access point voltage transient stability than conventional PID control when subjected to the three-phase short circuit fault.
The Computer Projection Remote Page-Turner Controller Design Based on the HT82M99E MCU
Authors: Cao Jian Ping , Li Cong Hong , Jiang Guo Dong
Published: July 2013

Based on the analyzing the feature of HT82M99E MCU and the characteristic of signal codes from the remote transmitter based on PT2262 chip ,proposes a design of the computer projection remote page-turner controller based on the HT82M99E,and the software decoding technology is applied. By testing, this technology can reduce chip quantity, reduce PCB area, reduce the cost of the hardware, and can ensure reliability of soft decoding.
The Development of Environment-Friendly and Energy-Saving Engineering Machinery General Oil
Authors: Huang Fu Chuan , Tang Xing Zhong , Su Man Rong
Published: July 2013

This article combines with the engineering machinery of diesel engine, the hydraulic system, the gear system, the hydraulic transmission system using oil of performance requirements; in order to meet the need of engineering machinery actual using condition. Through the study of base oil, antioxidant and corrosion inhibitor, detergent and dispersant additive, extreme pressure and anti-wear agent, rust inhibitor, anti-emulsifier, anti-foam agent, etc composite additives. using Poly-α-olefin (PAO) and dioctyl sebacate composite act as the engineering machinery general oil of base oil, and by using the artificial neural network algorithm targeted to a variety of the functional additive of screening and prediction, and using the genetic algorithm optimists the selection of formula, develop the environment-friendly and energy-saving engineering machinery general oil.
Design of Calibration System for a Great Quantity of High Precision Scientific Grade CCD Cameras
Authors: Tan Jia Hai , Li Peng Yu , Qu You Shan , Han Ya Meng , Yu Ya Li , Wang Wei
Published: July 2013

For the calibration of a great quantity of scientific grade CCD cameras in the high energy physics system, a scientific grade CCD camera calibration system with high precision and efficiency is designed. The designed camera calibration system consists of a 1053nm nanosecond solid-state laser, a knife, a double-integrating sphere, a laser power meter, a signal generator, a computer with its data processing software. Key technical parameters of scientific grade CCD under the condition of 1053nm optical pulses that are the modulation, contrast, defects, optical dynamic range, non-linear response can be calibrated by the designed calibration system. A double-integrating sphere with high uniformity and stability is designed as a uniform light source, which improves the calibrating performance and accuracy. Experimental results show the system designed in this paper can calibrate the large number of scientific grade CCD cameras quickly and efficiently.
Implementation and Application between High Stability PC and FPGA Serial Communication
Authors: Zhang Zheng , Cai Li Xin , Wang Yu Kun
Published: July 2013

In this paper, we mainly introduce the serial communication between PC and FPGA and adopt the design principles of DDS phase accumulator to achieve small error of baud rate generator and provide the reliable data transmission. On PC, we use the Labview software to design control interface, which is responsible for sending the control command. The experimental results indicate that the communication is feasible, high stability. This design is applied to the control unit of waveform generator based on FPGA by inputting relevant data on PC such as waveform selection, frequency control, range control and phase control to realize the function of waveform selection, amplitude modulation, phase modulation and frequency modulation.
Research on Acoustic Emission Signal Processing of Concrete Beam in Fracture Experiment Based on the HHT
Authors: Li Wei , Yang Yu , Jiang Peng
Published: July 2013

In this paper,the fracture process of concrete beam was monitored by acoustic emission,and the acoustic emission signals of the concrete beam in fracture process were transformed by Hilbert-huang,four different failure stages could be seen in the fracture process of concrete beam through the Hilbert spectrum diagram and the effectively monitoring of failure process of concrete beam was realized.
A High Accurate Adaptive Temperature Control Algorithm Based on Fuzzy Reasoning and PID Control
Authors: Guo Tian Tian , Wang Qing Tao , Shen Qing
Published: July 2013

A high accurate adaptive temperature control algorithm is proposed and implemented for a thermostatic chemical detecting device. The proposed algorithm combines the advantages of PID control and Fuzzy control which are high accuracy and easy control. The algorithm flow chart and fuzzy reasoning rules are presented. The experiment results and actual operation show that the algorithm has much better performance on adaptability, stability, accuracy than simple PID control and has a great application prospect on the field of constant-temperature chemical apparatus.
The Application of Fuzzy Control in the Intelligent Crossroad Traffic Control
Authors: Xie Zi Qing , Liu Bin
Published: July 2013

Considering the complexity, uncertainty, randomness of the city crossroad traffic, it is very difficult to structure precise mathematic model, the traditional traffic theory and method applied in the city traffic control cannot deal with it efficiently. However the fuzzy control can handle it intelligently without precise mathematic model, as it can make decision just like people thinking in brain. Based on the practical experience, it has a big application prospect in intelligent city traffic control. According to the development of Fuzzy Control, we summarized the basic composing and design approach of Fuzzy Control. Finally we introduced the design of the intelligent crossroad traffic control. Compared with the simulation of fixed control, we found that the performance and parameter were improved based on the Fuzzy Control.
Ultra High Pressure Control Technology on Small Cavity
Authors: Shang Chun Min , Zhang Dong Mei , Fan Jing Feng
Published: July 2013

Based on the current key problem of the ultra high pressure control technology on the small cavity, an analysis method of the ultra high pressure control was put forward on 500ml small cavity. The mathematical model was derived on pressure-volume change of the small cavity. A pressure control system was set up on the small cavity according to the model. Control program was done using labview software, test process was completed automatically, test data was displayed in real time and the output data and report form was received. The test results show that the system have achieved the function of a increasing ultra pressure. The capacity of system increasing pressure is up to 150Mpa, controlling pressure accuracy up to 0.31% and the holding pressure accuracy up to 0.48%.
Study on Intergranular Corrosion of Sensitized 316L Stainless Steel
Authors: Li Yong Quan , Bai Wen Jie , Pu Shao Qing , Xie Xu Meng , Duan Quan
Published: July 2013

The results of experimental study on intergranular corrosion of sensitized 316L stainless steel by mass loss measurement and metallographic inspection method through boiling nitric acid experiments show that: the intergranular corrosion behavior of sensitized 316L stainless steel is mainly divided into three stages: initiation stage, stable stage and rapid development stage, the corrosion rate added with the experimental time extension; the degree of intergranular corrosion has a direct relationship with material grain size, large grain regions have a small degree of intergranular corrosion; and small grain regions have a large degree of intergranular corrosion, even leading to pitting corrosion.
Study on the Ultraviolet Aging of APMOC Fiber
Authors: Chen Fei , Yue Ying Juan , Sun Wen Xia , Jing Ya Que
Published: July 2013

An ultraviolet aging test of APMOC fiber is carried out with the irradiation of xenon lamp, in which the effects of ultraviolet aging on APMOC fiber were studied by single fiber tension and FTIR. The result shows that the tensile strength, the modulus of elasticity and the elongation rate of APMOC fiber would have a change, among which the tensile strength increases by 13.7% after 6 hours UV irradiation and decreases by 2.1% after 36 hours. The C-N in amide of the APMOC fiber is broken; while the hydrogen bond combination ability and crystallinity increase by FTIR. It can, therefore, be concluded that short time UV irradiation can cause two contradictory effects on APMOC fiber.
Research on the Influence of Epoxy Resin from Hydrothermal Aging
Authors: Yue Ying Juan , Chen Fei , Liu Yan , Jing Ya Que
Published: July 2013

Through the experiment on hydrothermal aging, the influence on the properties of epoxy resin is studied, while monofilament tensile test and the corresponding structural analysis are carried out on the test samples. The result shows that the hydroscopicity of resin conforms to Fick 2nd law; the balance amount of hydroscopicity is 5.15%; the spreading coefficient of moisture in compound material is 1.6538×10-6mm2/s; the descending trend of the mechanics of resin corresponds with the increasing trend of hydroscopicity; the mechanism of hydrothermal aging of resin is the spreading of water molecules and the hydrothermal influence on materials, without any obvious post-solidity and physical aging.