bluuebunny/crossref_metadata_2025 huggingface dataset:
«Le Domaine de la Terre», un conjunto de realizaciones-piloto a base de tierra, en L'isle D'abeau (Francia)
Authors: Salas J. , Moreno R.
Published: April 2013

Se presentan en el trabajo de forma sistematizada algunas de las realizaciones de viviendas experimentales a base de tierra (bloques, tapial, bloques compactados, tierra-paja....) realizadas en las cercanías de Lyon (Francia) y que constituyen el conjunto «Le Domaine de la Terre». Se trata de una realización a base de once proyectos distintos en los que han intervenido un buen número de instituciones, equipos de proyecto y profesionales franceses. Globalmente constituyen una excelente exposición a escala natural de las posibilidades de las construcciones de tierra, aunque los resultados son muy diversos -formal y conceptualmente- entre los distintos proyectos.
Comportamiento de los suelos para la confección de adobes
Authors: Barrios Gastón , Alvarez Lucio , Arcos Hernán , Marchant Enrique , Rosi David
Published: April 2013

La constante demanda en Chile por construir en adobe, especialmente en aquellas zonas alejadas de los centros urbanos industrializados, hace que sea preciso reemplazar las recomendaciones existentes para la construcción con este material, producto casi exclusivo de la experiencia de algunos constructores que en el pasado han tenido éxito al trabajar con él, por una norma, que no sólo límite, sino que más que eso, establezca pautas que permitan construir en adobe con la seguridad necesaria, aprovechando las cualidades inherentes del mismo, el empleo de aditivos y naturalmente proponga pautas para el diseño y cálculo de sus estructuras con un respaldo empírico adecuado.
Dando un primer paso al respecto, es que hemos experimentado, en probetas RILEM, el comportamiento de algunas de las respuestas del mortero de barro seco, al variar factores como son la arcilla, el limo, la arena y la cantidad de agua de amasado.
Los resultados de este estudio, pueden resumirse en las siguientes cuatro recomendaciones básicas:
1. Emplear suelos con razón limo-arcilla cercano a uno y la sumatoria entre 35 y 45% del total.
2. El contenido de arena del suelo debe encontrarse entre un 55% y un 65%.
3. La cantidad óptima para el agua de amasado depende de las propiedades mismas del suelo y de la tecnología empleada. En nuestro caso, dicho óptimo se encuentra en el límite líquido, más un tercio del índice de plasticidad de los suelos. Cabe hacer notar el alto nivel de significación de este factor en todas las variables estudiadas y sería de gran ventaja poder controlar su contenido, sin embargo, a niveles artesanales; esto no ha sido posible.
4. Para que el barro una vez seco, alcance características mecánicas satisfactorias y uniformes, es preciso que:
i) Se proceda al macerado del suelo en estado saturado de 48 a 72 horas.
i i) Antes del llenado de los moldes, proceder a un intenso amasado de la pasta, para así evitar que las láminas de arcilla se ordenen según atracciones eléctricas.
Normativa relacionada con las construcciones de tierra
Authors: Guinea María Jesús
Published: April 2013

No disponible
Recuperación del tramo urbano del río Manzanares, Madrid (España)
Authors: Sánchez Félix Cristóbal
Published: April 2013

Se exponen en este artículo algunos aspectos de las obras de mejora de las condiciones del tramo urbano del río Manzanares, dentro del Plan de Saneamiento Integral de Madrid.
Para conseguir el objetivo de la recuperación del río han sido necesarias grandes obras de infraestructura (Estaciones Depuradoras, Colectoras), estudios del cauce del río y de la calidad del agua; control de tos vertidos, etc. así como toda una serie de acciones encaminadas a la repoblación piscícola y avícola, Que actualmente es una realidad
Un sistema de saneamiento para Madrid
Authors: Sánchez Félix Cristóbal
Published: April 2013

El Plan de Saneamiento Integral de Madrid representaba la culminación de una serie de acciones emprendidas, durante varios años, para conseguir que la ciudad completase su sistema de saneamiento. Con este conjunto de acciones comprendidas en el Plan puede decirse que esta infraestructura básica ha adquirido un nivel suficiente, capaz de prestar un servicio acorde con las auténticas necesidades de la Villa.
Carpas para auditorio en Pinar del Rey, Madrid/España
Authors: De Prada Poole José Miguel
Published: April 2013

Se describe, en este artículo, los materiales y proceso de montaje empleados para construir con una estructura modular tensada, la cubierta del escenario de un auditorio cubierto dado el interés que ofrece lo inédito de su tecnología y la posibilidad de experimentar las cualidades espaciales de la misma en estos casos.
A su vez, al exponer los criterios que llevaron a su empleo, se ponen de manifiesto las ventajas económicas y de montaje, frente a sus implícitas dificultades de proyecto:
- superficies de doble curvatura anticlástica;
- deformación no lineal de la estructura;
- ajuste de empalmes y piezas;
- diseño y fabricación de piezas especiales.
Láminas alveolares para la construcción económica
Authors: Delarue J. M. , Brossin J. F.
Published: April 2013

Este artículo relata una experiencia de auto-construcción realizada en la Universidad Pedagógica de Arquitectura nº 1, Francia, con el fin de ensayar un principio de estructura de lona y yeso adaptada a la producción de construcciones baratas en los Países en vías de Desarrollo.
Este principio constructivo presenta los siguientes intereses principales:
- Técnica que utiliza materiales tradicionales, baratos y locales, adaptables a varios niveles de empleos: auto-construcción por los usuarios, construcción por pequeñas empresas artesanales, prefabricación industrializada en pequeñas unidades de producción.
- Posibilidad de realizar multiplicidad de componentes que cumplen varias funciones constructivas y en particular los elementos alveolados que pueden constituir cubiertas ventiladas.
Cúpulas y bóvedas de yeso proyectado sobre molde de metacrilato
Authors: VMBC Equipo
Published: April 2013

Investigación del material yeso dentro del programa «Materiales, Tecnologías y Prototipos para Viviendas de muy Bajo Coste», que se desarrolla actualmente en el lETcc, con el fin de llegar a la realización de unas tipologías de viviendas construidas mediante materiales y tecnologías que permitan facilitar un producto final que reúna como características fundamentales: adecuación a las necesidades físicas y socioculturales de la zona a la que se destinan, y un muy bajo costo de ejecución
Construcciones en yeso proyectado sobre vegetales
Authors: Martínez Hubert
Published: April 2013

Procedimiento de construcción desarrollado al comienzo de 1981 en el Senegal, teniendo como objetivo la valoración de las fuentes naturales y humanas, especialmente los vegetales en estado silvestre y el fosfoyeso, residuo de la industria química del Senegal. La introducción de la proyección mecánica permite aumentar sensiblemente el rendimiento del trabajo y mejorar la calidad. La proyección reduce el número de oficios que intervienen en la obra por la supresión de enlucidos, sistemas de estanquidad y pinturas sobre la gruesa obra y simplifica la colocación de las instalaciones técnicas y de carpintería.
La adquisición del material de proyección, necesitando un capital relativamente modesto, se encuentra al alcance de pequeñas y medianas empresas que deseen especializarse en los trabajos de yeso. La rentabilidad financiera del procedimiento está asegurada para un precio del yeso de hasta el 180% del precio del cemento.
El enlucido exterior de yeso en las rehabilitaciones de las fachadas de París
Authors: Raymond Pigache M.
Published: April 2013

La utilización, fabricación y puesto en obra de morteros de yeso, sobre las fachadas antiguas en el viejo París -técnica puramente manual-, están precisadas desde hace mucho tiempo.
Numerosos enlucidos de mortero de yeso, realizados bajo el reinado de Luis XIV, presentan todavía un excelente comportamiento a pesar de que, como es sabido, el yeso en exteriores es muy sensible a disolverse.
Este estudio ha permitido aclarar cuatro parámetros fundamentales y, sobre todo, sus conclusiones han permitido la realización de numerosas rehabilitaciones, tanto en inmuebles de prestigio como en edificaciones modestas:
- El empleo de un mortero cuyos componentes sean más cercanos a los materiales antiguos.
- Una aplicación puramente manual.
- Una proporción establecida a fin de proteger de las aguas de desagüe los enlucidos de mortero de yeso, las cornisas, molduras y etc.
- Muros portantes con las características mecánicas más elevadas que las de los enlucidos.
Sistema Dragados–Plastbau
Authors: Díaz-Romeral Pablo , Guinea M. Jesús , Flórez Alia José
Published: April 2013

El sistema Dragados-Plastbau forma parte de una familia de sistemas, nacido en los Estados Unidos y hoy aplicado muy crecientemente en Inglaterra, Francia, Alemania, Australia, Italia y Suiza. Pero si bien tiene en común con ellos la integración del poliestireno expandido en el panel, es ciertamente innovadora en conseguir con unas sencillas máquinas una variedad de paneles con diferentes espesores, que se pueden trasladar sin ningún problema, montar con facilidad y producir un semiprefabricado que facilita una solución ágil para cualquier proyecto, incluso aunque se haya pensado para otro tipo de proceso o para obra tradicional.
Estabilidad estructural del sistema Dragados-Plastbau
Authors: Quereda Laviña José , Rúa Alvarez Edelmiro , Conde Salazar José María , Rodríguez Santiago Jesús
Published: April 2013

El análisis del comportamiento estructural del sistema constructivo Dragados-Plastbau exigió llevar a cabo un estudio de cada uno de sus elementos, muros y forjados, y del conjunto de ellos formando parte de los edificios.
Durabilidad de los microhormigones del sistema constructivo Dragados-Plastbau
Authors: Del Olmo Rodríguez César , Márquez Enrique
Published: April 2013

La durabilidad de los morteros y hormigones, en general, es un tema complejo en el que tienen implicación los propios componentes del material, el proceso de construcción, las propiedades físicas del mismo, las solicitaciones mecánicas y condiciones ambientales a que va a estar sometido, así como el efecto de las armaduras embebidas en el material, caso de verse afectadas por una corrosión importante. En particular, las propiedades físicas del microhormigón que mejor definen su durabilidad pueden ser resumidas en términos de resistencia, estabilidad y solidez, que cabe valorar a través de una serie de parámetros.
Proyecto y construcción de edificios con el sistema Dragados-Plastbau
Authors: De Aguinaga José A. , Márquez Enrique
Published: April 2013

La prefabricación y la industrialización de la construcción a menudo han fracasado ante los condicionantes que imponen al proyectista al comportar soluciones rígidas no siempre adaptables a las necesidades reales del proyecto. Por el contrario, la adaptación de los sistemas al proyecto únicamente puede estar justificada para la realización de grandes series o en ocasiones empleada para la construcción de edificios singulares, sin estrictas limitaciones económicas, lo que en definitiva viene a suponer una desvirtualización de la razón de ser de aquéllas al transformar a éstas en verdaderas obras artesanales donde a menudo la experiencia adquirida no es generalizable para otras realizaciones.
El palacio de Anglona: un ilustre desconocido
Authors: Arnáiz Gorroño María José , Gutiérrez de Calderón Gómez Enrique
Published: April 2013

No disponible
Obras de fábrica resistentes. Consideraciones generales de cálculo
Authors: Jenaro Garrido José María
Published: April 2013

El presente artículo recoge un estudio de la capacidad resistente de las obras de fábrica no armadas ante las solicitaciones normales, a partir del conocimiento del valor nominal de la resistencia a compresión de los elementos componentes o de los resultados de ensayos a compresión realizados sobre macizos o probetas de obra de fábrica.
Las expresiones obtenidas para secciones homogéneas se extienden a secciones que por comprender cavidades hayan de considerarse heterogéneas, haciendo posible una determinación de su comportamiento resistente mediante la introducción del concepto de sección resistente homogénea equivalente.
Finalmente se incluye un estudio sobre la deformabilidad y pandeo de las obras de fábrica a los que se aplican diversas expresiones ya recogidas en el Código Modelo CEB-FIP y en la vigente Instrucción EH-82 para obras de hormigón.
Posibilidades estructurales de materiales a base de cal como conglomerante: primeros resultados
Authors: Estrada Enrique , Barbero José Miguel
Published: April 2013

La cal es un material abundante y cuya producción suma a una tecnología muy accesible la ventaja de poder materializarse en pequeñas plantas dispersas, para poder reducir al mínimo la componente de costo debida al transporte.
En el presente trabajo se ha planteado la posibilidad de obtener hormigones con fines estructurales, para viviendas de baja altura y que sean de fácil obtención, a base de cal y cenizas volantes o cenizas de cascara de arroz, variando sus proporciones, grados de finura y estudiando la influencia de distintos factores en la resistencia inicial y final.
Se han obtenido buenos resultados, principalmente con ceniza de cascara de arroz y cal con resistencias a 60 días superiores a los 15 MPa.
El ahorro de energía en la fabricación de cemento: últimos avances sobre las adiciones puzolanicas
Authors: Talero Morales Rafael
Published: April 2013

Se da una rápida panorámica de los planteamientos y actividad operacional llevados a cabo para intentar esclarecer en gran medida esta vasta problemática del comportamiento de las Adiciones Puzolánicas -en forma de Cementos de Mezcla constituidos por Cementos Portland (clinker portland en su caso más regulador de fraguado), P o PY y Puzolana(s) únicamente, hasta un 40% en masa de esta(s) última(s)- frente a distintos medios más o menos selenitosos, así como también de las principales conclusiones, deducciones y consejos prácticos obtenidos y de las aplicaciones desarrolladas a raíz de la finalización oficial de unos densos trabajos (*) sobre las mismas, llevados a cabo en este Instituto.
Asimismo se hace hincapié de la trascendencia inmediata que las Aplicaciones de tales trabajos, van a tener en las industrias del Cemento y el Hormigón.
Le processus de révision et l'écriture informatisée – Description des utilisations du traitement de texte par des élèves du secondaire au Québec
Authors: Grégoire Pascal , Karsenti Thierry
Published: April 2013

Les TIC modifient substantiellement l'acte scriptural : en influençant les processus cognitifs chez les scripteurs, elles libèrent des ressources cognitives (Daiute, 1983 ; Jonassen, 1999). Pourtant, malgré cette influence, les scripteurs informatisés se contentent souvent d'apporter des modifications de surface à leurs textes (Faigley & Witte, 1981 ; Figueredo & Varnhagen, 2006). Nous avons donc voulu décrire comment les TIC interviennent réellement dans le processus cognitif de révision. Pour y parvenir, nous avons procédé selon une approche qualitative, fondée sur l'observation de scripteurs informatisés (N = 11). Nous avons analysé le type d'interaction qu'ils entretiennent avec le correcteur d'orthographe ; de plus, nous avons analysé les verbalisations concurrentes à la tâche ainsi qu'une série d'entrevues de groupe. De façon générale, nous avons constaté une utilisation somme toute limitée des outils informatiques, que les scripteurs n'arrivent pas à exploiter pleinement. Le manque d'habiletés au clavier et au traitement de texte pourrait constituer une entrave à une utilisation plus rentable des TIC.
Characterization of Nanochitosan Incorporated Solid Polymer Composite Electrolytes for Magnesium Batteries
Authors: Ammakutti Sridevi N. , Karuppasamy K. , Vijil Vani C. , Balakumar S. , Sahaya Shajan X.
Published: April 2013

Chitin and chitosan, the most abundant biopolymers possess several excellent advantages such as biodegradability, ecological friendly, biocompatibility, low toxicity, bioactive, antimicrobial activity and low immunogenicity. They occur as ordered crystalline micro fibrils and are useful in applications that require reinforcement and strength. Nanochitosan was prepared from chitosan by oxidation degradation method using H2O2. Nanocomposites polymer electrolyte system composed of polyethylene oxide (PEO) as the host polymer, magnesium perchlorate Mg(ClO4)2 as salt and different concentration of nano-sized chitosan as filler have been studied. The effects of addition of nanochitosan on the ionic conductivity of composite polymer electrolytes are investigated and it is found to rise upon one order (10-3 Scm-1). The complexation behavior of PEO and Mg(ClO4)2 are verified through FT-IR studies. The nanocomposite films possess uniform surface morphology which has been identified by SEM analysis.
Fe2O3 and V2O5 Nanoparticles: A New Voltammetric Sensor
Authors: Suresh R. , Giribabu K. , Vijayalakshmi L. , Stephen A. , Narayanan V.
Published: April 2013

The Fe2O3 and V2O5 nanoparticles were prepared by thermal decomposition method. The XRD and FTIR spectrum of the samples confirms the formation of Fe2O3 and V2O5. The FE- SEM images showed the morphology and size of the samples. The synthesized Fe2O3 and V2O5 nanoparticles were used to modify the glassy carbon electrode (GCE) and the modified electrode was found to exhibit electrocatalytic activity for the oxidation of uric acid (UA). It shows that the nanoparticles will exhibit promising applications in the development of sensors.
Structural and Optical Characterization of Pure and Mn2+ -Doped ZnS Nanoparticles Prepared by Solvothermal Method
Authors: Manjulavalli T.E. , Kannan A.G.
Published: April 2013

ZnS and Mn2+doped ZnS nanoparticles are synthesized through a simple solvothermal method. The structural and optical properties of pure and doped ZnS nanoparticles were studied using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), UV-vis absorption and photoluminescence spectroscopy (PL). X-ray diffraction analysis reveals that undoped and Mn2+doped ZnS crystallizes in cubic structures. The average grain size of the nanoparticles lies in the range of 2.2 to 4.8 nm. The SEM image shows that pure and doped nanoparticles are in spherical shape. The optical absorption spectrum exhibits a clear blue shift for ZnS and Mn2+doped ZnS nanoparticles when compared with bulk ZnS. Photoluminescence spectra recorded for ZnS nanoparticles exhibits an emission peak centered around 428 nm for an excitation wavelength of 330 nm. However, for Mn2+doped samples, an yellow–orange emission is observed along with the blue emission.
QoS Research in the Industrial Control Network Systems
Authors: Chen You Jun , He Hong Ying , Zeng Yun Bing
Published: April 2013

Proposed a QoS model based differentiated service through analysis of quality of service requirements of system data in the coexistence of industrial control systems and Internet environment. And then focused on the queue scheduling problems, gave the mathematical expectation of the delay time and the buffers; provided an important basis for the design and configuration of the QoS.
Data Security Monitoring of SQL Server Database
Authors: Hui Zhang , An Li Qiang , Yue Peng
Published: April 2013

Database system is information aggregation. So the security of database is very important. This paper describes the research process of tracking SQL server database data tampered. Now we can monitor the important data in daily work. And providing a guarantee for the safety, accuracy of database.
A Modified Davidenkov Model for Stiffness and Damping Characteristics of Saturated Clayey Soils due to Low-Amplitude Small-Strain Vibrations
Authors: Jia Peng Fei , Yang Ai Wu
Published: April 2013

Railway track and nearby structures in the vicinity of high-speed railway are exposed to low-amplitude small-strain vibrations as high-speed railway traffic construction activities arise. These low-level dynamic events can lead to a non-linear softening behavior of the “elastic” stiffness and a considerable amount of energy dissipation in soils with a gradually increasing strain. The modelling of these non-linear behaviours are an important to predict lifetime and serviceability of existing structures in the vicinity of high-speed railway. An objective of this study is to develop validated computational models that can be used to perform stiffness and damping characteristics of saturated clayey soils due to low-amplitude small-strain vibrations. This paper provides an insight in the normalized shear modulus G/Gmax and damping ratio D in relation with shear strain amplitude γ through free-vibration column test, and proposes a modified Davidenkov model.
Seismic Analysis on RC Frame Strengthened with CFRP
Authors: Liu Qiang , Bai Xi Qing , Zhao Hai Long
Published: April 2013

A nonlinear finite element method is used to analyze the dynamic property of a five-storey reinforced concrete (RC) frame structure with and without carbon fiber reinforced plastic (CFRP). When the frame strengthened by CFRP, seismic performance of that is improved better than the frame without CFRP. The inter-story displacement angles of the frames with and without CFRP satisfy the seismic requirements from the results of earthquake transient analyses, when the frame is exposed to the frequent and rare earthquake.
Atomic Diffusion in the (001) Surface of Cu3Ag Ordered Alloy
Authors: Wen Yan Ni
Published: April 2013

Both the formation and migration energies of a single vacancy migrating intra- and inter-layer of the CuAg-terminated (001) surface or Cu-terminated (001) surface for Cu3Ag ordered alloy have been calculated by using the modified analytical embedded-atom method (MAEAM) with the molecular dynamics (MD) method. The surface effects on the vacancy formation and migration are all down to 6L for the CuAg-terminated (001) surface, but is respectively down to 5L and 6L for the Cu-terminated (001) surface. The vacancy energetically formed in the 1L. There is a vacancy aggregation tendency in the 1L as well as in the bulk the Cu vacancy is easier to be formed than the Ag vacancy.
The Effects of Sintering Temperature on the Properties of Mg-Mn-Zn Ferrites
Authors: Fan Ji Wei , Li Wen Qing , Zhao Hui Jun , Zhang Xiao Li , Zhang Zhen Guo
Published: April 2013

The present work shows the results of investigation on the effects of sintering temperatures of (Mg0.25Mn0.1Zn0.65)Fe2O4 ferrite on its sintered density, initial permeabilty, resistivity and microstructure. To achieve better sintered density and initial permeabilty, the sintering temperature should be ≥1200oC. However, the higher sintering temperature results in larger the grain size, which causes the reduction of the resistivities of Mg-Mn-Zn ferrites. Furthermore, the resistivities of samples are environmental temperature sensitive, and possibly possess the similar function of NTC thermistor over the testing range 25-225oC.
3D MRO Job Card Publishing Method for Aircraft
Authors: Geng Jun Hao , Tian Xi Tian , Liu Xiang Wei
Published: April 2013

In order to improve the accuracy of maintenance, repair and overhaul (MRO) description and the clarity of on-site guidance for aircraft MRO job card, a publishing method for aircraft 3D MRO job card based on aircraft 3D model was proposed. This method can show the disassembly and assembly simulation process with dynamic viewpoint navigation technology to conform to the observation habit of human, and separately show technical requirements from different MRO disciplines and operation tasks with multi-view 3D annotation method, and finally, transforms the MRO order into 3D portable job card file based on lightweight model and releases it to MRO site. The MRO instance of aircraft right wing shows that this method can generate intuitive, accurate and non-ambiguous MRO process description, improve the quality and efficiency of aircraft MRO.
Study on Paper Electromagnetic Drying Rate
Authors: Wang Zheng Shun , Zhen Zhao Hui
Published: April 2013

Paper electromagnetic drying technology is a new paper drying technology different from traditional steam drying. Today, environmental pressure deteriorating, energy crisis approaching, doing researches on paper electromagnetic drying technology has a special meaning, especially to high speed toilet paper machine which is truly needed and has a vast developmental potential. This thesis is based on electromagnetic dryer and steam dryer study. And the changes measured in the experiment at diverse temperatures and quantities in the experiment has shown a higher efficiency of electromagnetic drying technology than conventional steam drying technology.
Comparsion of Machining Stability of Up and Down Milling
Authors: Hsiao Te Ching , Wang J.J. Junz
Published: April 2013

The purpose of this research is to discuss the machining stability in of the up and down milling of three milling systems: 1) the feed-direction one-dimension, 2) the normal-to-feed-direction one-dimension and 3) the symmetric two-dimension milling systems. A simplified model with time-invariant parameters is adopted to simulate the milling process. In this model, the elementary cutting function, which represents the trajectory of cutting force for a certain local cutting edge, plays an important role in affecting machining stability of the different cutting configurations. This paper presents an in-depth discussion on the effects of cutting configurations and radial depth of cut on the elementary cutting function, and also on the stability lobes. It is found that the elementary cutting function of one-dimension milling system is a real number, as well as its positive and negative values will lead to totally different chatter features. Most technical literatures focus on the chatter features of positive elementary cutting function, while this research discuss that of both positive and negative ones. On the other hand, for the two-dimension milling system, its machining stability found to be dominated by the eigenvalues of the elementary cutting function matrix. The comparison of machining stability in up and down milling is then analyzed and three conclusions are drawn in this research. Firstly, the feed-direction one-dimension milling system has better machining stability in up milling. Secondly, the normal-to-feed-direction one-dimension milling system has better machining stability in down milling. Thirdly, up and down milling both show the same machining stability in the symmetric two-dimension milling system.
Design and Simulation for Key Components of Robotic Flower-Seedling Transplanter
Authors: Wang Xiu , Feng Qing Chun
Published: April 2013

In order to improve the mechanical transplanting for flower seedling, a new robotic transplanter was introduced. The design of two key parts, grasper and transit unit, was emphasized. The grasper driven by a ring-shaped spring, was used to pick the seedling at its root from the tray-hole, and the elastic holding-pressure was easily adjustable, and advantageous to prevent rigid hurt on seedling root. The module of toothed belt and guide rail was applied in the transit unit to carry and locate the graspers, and the module is appropriate to the transplanting operation of less vibration and higher efficiency. Finally, the performance of driving elements for grasper and transit unit was verified, according to the simulated result on the virtual prototype based on ADAMS.
Heat Insulation Silicone Coating ANSYS Simulation Analysis
Authors: Wang Zheng Shun , Zhen Zhao Hui
Published: April 2013

By use of ANSYS software, Without coated high temperature resistant coating and coated with high temperature resistant paint two model to simulate heat transfer analysis, so as to explore the preparation of the high temperature resistant coating insulation heat preservation effect.
Study on Friction Characteristics According to Drawing Variables in Press Drawing Process
Authors: Heo Young Moo , Kim Jong Deok , Jeon Yong Jun
Published: April 2013

Friction is generated between a press tool and a material during the inflow of material in an automotive press drawing process. Currently, there is deficienttechnical information on such tool-material friction properties. This study is accordingly aimed to understand friction characteristics by investigating them from drawing variables in the press deep-drawing process for steel plates of 590MPa grade and above that are recently being applied for the reduction of weight and improvement of safety of automobiles. The drawing variables in this study are blank holder holding pressure, drawing velocity, and tool surface treatment, which are tested and applied for stamping analysis. The results showed that for holding pressure and drawing velocity, friction coefficient decreases as holding pressure and drawing velocity increases. In case of friction properties according to tool surface treatment, friction coefficient is lower in surface-treated tools compared to non-surface-treated tools, which verifies the need for surface treatment when fabricating press tools. In addition, this study ascertained the need to have a stamping analysis that considered actual drawing variables when analyzingforming by verifying the results of drawing simulations after applying the experimented friction coefficient in the stamping analysis.
Synthesis and Characterization of Fe2+-CTS/CA-CNTs Composite and its Magnetic Properties
Authors: Yu Chang , Zhang Xu , He Kan , Liu Yue , Qiu Jie Shan
Published: April 2013

A novel biocompatible Fe2+-chitosan (CTS)/citric acid modified carbon nanotube (CA-CNTs) composite (Fe2+-CTS/CA-CNTs) has been successfully synthesized by covalent bonding and crosslinking chemistry, followed by the reduction. The samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis spectrum, X-ray diffraction (XRD), inductively coupled plasma (ICP), thermal gravimetric analysis (TGA), and vibrating sample magnetometer (VSM) techniques. The results show that the CTS has been successfully grafted to the CA-CNTs carrier and Fe2+ ions are absorbed on the CTS by coordination bond mode. It was found that the Fe2+-CTS/CA-CNTs composite shows good magnetic properties with a low ratio of remanence to saturation magnetization and is in a superparamagnetic state at room temperature. It is believed that the Fe2+-CTS/CA-CNTs composite will be potential for application in MRI.
Reserch on EC Security Problems and Countermeasures
Authors: Hu Jin Song
Published: April 2013

With the rapid development of the Internet, EC is growing rapidly. The use of information technology to transmit and process business information has inevitably brought the defects and shortcomings of its own into the field of EC.The security issue is becoming the primary factor restricting the development of electronic commerce ,and is the most important issues related to EC system can be run successfully. EC security issues can be basically divided into two parts, namely, computer network security and business transaction security. The paper discusess these two parts and gives the countermeasures in the last.
Clinical Classification and Prognosis of Patients with Multiple Sclerosis in Northern China
Authors: Han Xue Mei , Chang Ying , Zheng Zhao Shi , Liu Song Yan
Published: April 2013

Objective: To study the clinical classification of multiple sclerosis (MS) by analyzing the features of the magnetic resonance imaging (MRI) on brain and spinal cord and surveying the natural history. Methods: MRI examination was conducted on 132 clinically diagnosed multiple sclerosis patients and their quality of life and disability rate were graded. Results: The general distribution of lesions in the nervous system was obtained. In northern China, relapsing-remitting MS (RRMS) by natural course classification and simple brain MS by lesion distribution classification lead to fewer neurological deficits with a relatively top life quality. Meanwhile, there is a tendency for the correlation between the pathogenetic locations of MS and its natural course prognosis. Conclusion: To improve the understanding of the prognosis of MS and promote the diagnosis ability to guide MS treatment. Multiple sclerosis (MS) is a common immune-mediated chronic disease of the central nervous system with the demyelination of white matter as the main pathological feature. The incidence of MS has a significant regional difference and studies on the natural history classification and lesions distribution classification of MS patients in northern China are not sufficient. In this study, natural history and lesions distribution of MS patients were classified by MRI approach and the impacts of each MS classification on neurological deficits and quality of life were observed. In this thesis, features and prognosis of MS classifications in northern China are discussed for the purpose of improving the level of diagnosis and treatment.
Atomic Simulation of Size Effect and Surface Properties of Aluminum Nanoparticles
Authors: Zhu Wei , Song Wu Lin , Wang Jian Jun
Published: April 2013

Here, modified analytic embedded atom method (MAEAM) has been utilized to simulate size effect and surface properties of aluminum (Al) nanoparticles. According to the simulation results, we can find that lattice parameter and excess stored energy are size dependent. The simulated excess stored energy ranges from 2.12 to 57.61 kJ/mol, which is in the same order of magnitude with experiment results; surface energy of Al nanoparticles ranges from 0.78 to 1.10 J/m2, which is not invariant but size related. Furthermore, non-uniform lattice distortion has been observed in Al nanoparticles, and mainly concentrates in the first and second shell of surface layers. Theoretical research based on our simulation results provides a novel method to predict excess stored energy of metallic nanoparticles.
The Application of Fast and Effective Shot Boundary Detection Algorithm in Mechanical Engineering
Authors: Li Xin Jun , Chen Ping
Published: April 2013

In this paper, a novel shot boundary detection algorithm is proposed that operates completely in the compressed domain using macroblock type information. While the proposed algorithm can save a lot of computation cost, extensive experiments support that the proposed algorithm also achieves superior performances. Such technique will provide a range of useful applications for on-line video content analysis, processing, and management. Experimental results show that the proposed shot boundary detection algorithm achieve a high recall, precision and F measure.
Implementation of a New Digital Grating Angular Acceleration Measurement System Based on FPGA and its Error Analysis
Authors: Zhao Hao
Published: April 2013

Shaft angular acceleration is one of the most important parameter of rotary machines, the designation and implementation of a new angular acceleration measurement system is proposed in this paper. First, the speed signal is acquired through grating and infrared photocell, then interpolation speed signal with high-frequency pulses, so as to convert speed signals to pulses, last, angular acceleration is received by processing these pulses. This measurement system combined with FPGA and SCM, the function of FPGA are generating pulses、interpolating speed signal and counting the number of pulses, the result of count is processed by SCM. The high accuracy of measurement system is verified accord to the test.and the causes of errors are received by theoretical analysis.
The Choice of Coolants in Accelerate Driven System
Authors: Li Jing Jing , Zhou Tao , Liu Meng Ying , Su Zi Wei , Zou Wen Zhong
Published: April 2013

The accelerate driven system has an important role in sub-critical reactor. With the good physical property of high specific heat, low vapor pressure, low thermal decomposition rate and so on, the glycerol, hydrogenated terphenyls and water of low pressure are widely used in the accelerate driven sub-critical reactor as the secondary coolant. Compare the three coolant by the aspect of heat economy and engineering safety, we conclude that, compared with the glycerol and the hydrogenated terphenyls, water of low pressure has the best heat economy, at the same time it has the lowest pressure drop and the highest coefficient of heat transfer in the heat exchange tube. Therefore, choose water in low pressure as the secondary coolant in sub-critical reactor can decrease the heat exchange area to a large extent, together with the advantage of economy and safe.
Estimation of Strength Parameters and Finite Element Simulation of Lime and Cement Stabilized Granular Soils
Authors: Azadegan Omid , Li Jie , Jafari Hadi
Published: April 2013

Finite element modeling of stabilized soils requires various data obtained from comprehensive laboratory experiments. High shear strengths and expensive test procedure of lime and cement stabilized soils almost make it impossible to attain a well describing data of stabilized materials to apply in FE models in some cases; Thus, this study has considered unconfined compressive strength as a not expensive laboratory strength test and utilized estimating functions presented recently for stabilized materials to evaluate the shear strength parameters of treated materials to be used in computer simulations. The estimated properties were applied in FE modeling to verify which estimating function is more appropriate for lime and cement treated granular soils. The study results show that at the mid-range strength of stabilized soils most of applied functions have a good compatibility with laboratory conditions but at lower or higher strengths some of functions would excel.
Optimized Design for Multi-Layer Absorbing Materials Based on Genetic Algorithm
Authors: Chen Xin , Liu Xiang Xuan , Wang Xuan Jun , Liu Yuan
Published: April 2013

In order to synthesize the multi-layer radar absorbing materials (RAM) with a thin thickness and wide bandwidth, accelerating genetic algorithm (GA) with constraints and elitist strategy is employed to design the multi-layer RAM satisfied by a special value of reflection loss to electromagnetic wave. Given predefined available materials with frequency-dependent permittivity and permeability, the GA technique determines the optimal material choice for each layer and its thickness. The algorithm was successfully applied to the synthesis of double-layer to four-layers RAM coatings in the frequency range of 2-18GHz,and the optimization results was evaluated.
Blind Source Separation for Impact Force Induced by Piston Slaps in Diesel Engines
Authors: Zhang Yong Xiang , Liang Bo , Li Jun , Ke Wei
Published: April 2013

The diesel engine vibration induced by piston impact force (also known as slaps) presents us very important information about piston-and-cylinder clearance and engine performance. However it is notorious difficult formaking an accurate measurement for the piston slaps due to the enormous interferences, reverberation, and complicated vibration responses. This paper presents an application of blind source separation technique to solve the problem. The method is based on one novel algorithm which uses blind source de-convolution algorithm. It can overcome the conventional blind source separation calculation drawbacks like local minimization value problems occurred with the fixed step response algorithm.The simulation and experiment results have indicated it can recover the corrupted signals and obtain the accurate piston slap signals at the measurement point.
Effect of Influential Factors on the Reliability of the Mechanical Behavior of a Composite Plate Holes Fatigue Loaded
Authors: Bouraoui C. , Bouassaadia Med. , Sghaier R. Ben , Karama Moussa
Published: April 2013

This work presents a sensitivity analysis of mechanical and geometrical parameters on a composite component under a cyclic loading. A design of experiments approach has been used. This study in improved by a reliability approach where the scatterings of all the characteristic properties are taken into account. The Monte Carlo method where used to compute the reliability. An application has been carried out on a composite rectangular plate with a hole in its center. Where a useful surface responses diagrams of the reliability are determined. A significant nonlinear effect of the fiber volume faction is observed on the behaviors reliability with no significant interactions effect with the others factors.
Convex Models and Component Mode Synthesis Methods for Robustness Function of Structures with Uncertain Parameters
Authors: Sarsri D. , Azrar L.
Published: April 2013

This paper presents a numerical procedure to compute the robustness function of large finite element models with parameter uncertainties based on convex models and component mode synthesis methods (CMS). For an optimal reduction of the size of the model the CMS with reduction of interface dof is used. This coupling methodological approach is used on one hand to reduce the size of the model and on the other hand to analyze the structures where the data on the uncertainties are limited enough. Robustness function is determined and the dynamic analysis of large and composed structures is investigated. Numerical results illustrating the efficiency of the proposed coupled procedures for large FE models with random parameters are presented.
Capillary Effects during Droplet Formation on the Solid Surface
Authors: Dwiyantoro Bambang Arip
Published: April 2013

We investigate the capillary effects during droplet formation on pillar surface via a dewetting process. The microdroplet formed from the fluid remains on the top surface of micropillar after the dewetting process. The simulation results show that the ratio of the diameter of microdroplet (Dd) and the diameter of micropillar (Dp) is correlated as 3.26Re0.25 for H/Dp<0.5, where Re is the Reynolds numbers and H is the liquid thickness between the top surface of micropillar and the upper substrate. The analytical solution for growth droplet based on the conservation of energy is provided. The numerical results show that our prediction is consistent with the analytical solution for a large range of Re number.
Effects of Grooved Surface with Nano-Ridges on Amplification of Hydrophobic Property
Authors: Lee Dong Ki , Lee Jun Hyung , Cho Young Hak
Published: April 2013

This paper shows how much the size of groove and ridge, which were fabricated on the silicon wafer, affected on the hydrophobicity of the grooved surface without chemical treatments and with chemical treatment such as self-assembled monolayers (SAMs) of organic silane. Furthermore, the contact angles (CAs) of water droplet on specimens were measured and compared with theoretical CAs of droplet in Cassie-Baxter state. The experimental results indicated that the specimen with the extensive groove width had super-hydrophobicity as compared to the specimen with relatively narrow groove width. The highest CAs of chemically non-treated specimens and chemically treated specimens were 171.9˚ and 173.1˚. This work explains that the grooved surface with nano-ridges and SAM coating contributes to improve hydrophobicity of surface.
Comparative Study on Off-State Breakdown Characteristics in Nanowire Junctionless and Inversion Mode Multiple Gate MOSFET
Authors: Lee Seung Min , Jang Hyun Jun , Park Jong Tae
Published: April 2013

A comparative study on off-state breakdown characteristics in nanowire JL and IM multiple gate MOSFETs has been performed for different gate bias voltages and fin widths. In order to understand the drain breakdown mechanism with different transistor structures, the device was simulated using the 3-dimensional ATLAS software. The band-to-band tunneling current and the gate-induced-drain-leakage current trigger the off-state breakdown in JL transistor and IM transistor, respectively. From experiment and simulation, the off-state breakdown voltage is lower in JL transistor than in IM transistor. As the gate is biased more negatively, the off-state breakdown voltages are increased in JL and IM transistors.
Optimum Patch Dimension Ratio of T-Shaped Microstrip Antenna
Authors: Rhee Eugene , Lee Ji Hoon
Published: April 2013

There are various feeding methods of antenna like as coaxial probe, coupling, parasitic elements, and impedance matching. This paper adopted the microstrip line method as the feeding method of the antenna. The high frequency structure simulator is used to analyze the characteristics of the T-shaped microstrip antenna with various patch dimensions. In comparison with the basic microstrip antenna, this proposed T-shaped microstrip antenna with 40.38 % of patch dimensions has the optimum characteristics of resonant frequency, return loss, and radiation pattern at 2.0 GHz band.
The Design of Acquisition System of Compact Seismic Recorder
Authors: Zhang Yan , Chen Zu Bin , Yang Yang , Yu Teng
Published: April 2013

At present, seismic exploration, as a commonly used geophysical method has been widely applied in the field of resource exploration. Combined with the special application environment, based on the techniques of 24bit Δ- ΣA/D, multi-channel seismograph acquisition system is realized by the 24bit Δ- Σ conversion chip CS5340; design the related circuits with FPGA, reading and caching the serial output data of D/A and converting to parallel dataflow, realizing the data transmit to ARM; On the basis of hardware design, we complete the design of the acquisition system monitoring and control software, use the C language designed acquisition software and trigger control software, realize the various instructions of the host via the Ethernet port (Ethernet) transmit to the ARM and complete of the data collection. Last, the prototype has been finished, and the primary test results are given
Progress on Cytotoxicity In Vitro of Carbon Nanotubes
Authors: Xing Zhi Hua
Published: April 2013

According to recent references, the progress on cytotoxicity in vitro of carbon nanotubes (CNTs) including the factors such as size , residual metal catalysts,and detection methods influencing cytotoxicity of CNTs are summarized. The results shown that residual metal catalysts must be removed as much as possible and ensure CNTs in some concentration range before using them.Biocompatibility of CNTs must be considered and chemical modification of CNTs to improve their use safety and advantages is indispensable.
Design and Realization of New Vehicle Attitude Measurement System
Authors: Fu Shao Bo , Zhao Ling , Yu Yan
Published: April 2013

This paper mainly studied a new acquisition system of the vehicle operation attitude. To obtain the best estimated value of the attitude angle, this system ran through the acquisition and processing of the output signal from the new MEMS gyro sensor ADIS16355, and integrated the acceleration signal and the angular rate gyro signal by using the differential measurement. Finally verified by the experiment, this is a practical measurement system, which can meet the accuracy requirements of the vehicle driving attitude measurement.
Using Single-Cycle-Related Electromagnetic Vector Sensors to Estimation DOA and Polarization Parameters
Authors: Zhu Lan Xiang , Shi Yao Wu , Shi Yi Ran , Deng Li Fei
Published: April 2013

This paper proposes a new algorithm for joint estimation of Directions-Of-Arrival (DOA’s) and polarization parameters of the single electromagnetic vector sensor. Based on the cyclostationary properties of the signal,the algorithm uses minimum norm method to strike the signal steering vector solution, and then gets the estimation of DOA and polarization parameters. Besides limiting the distribution of additional stationary noise and interference signals on various frequencies, this algorithm also restraints the estimation error of the noise subspace singular vector with outstanding results. Computer simulation verified the effectiveness of the algorithm.