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Online since: April 2014
Authors: Lei Chen
Introduction Textile-reinforced concrete (TRC) is a new composite material consisting of fine-grained concrete and high performance filament yarns made of alkali-resistant glass or carbon [1].
The roving is a bundle of a huge number of filaments that can act as a tensile reinforcement in the brittle concrete.
Given its potential applications, it is no surprise that there have been a large number of research initiatives aimed at evaluating its performance [2-9], and the formula for the normal section bearing capacity of carbon TRC beam [1, 8].
Online since: June 2014
Authors: Zai Yu Zhang, Jian Jun Yang, Yan Hui Wu
Introduction The refractory metals and their nitrides were mostly polycrystalline structure, the grain boundary between the polycrystalline was become the rapid diffusion path to Cu atoms.
When the substrate temperature increased, the surface diffusion of the adsorbed particles were increased, the number of the particle nucleation was enhanced, which were speeded up the deposition rate of the film.
While increasing the substrate temperature was also raised the number of surface absorption and bonding capacity, which enhanced the film growth rate.
Online since: July 2013
Authors: Bing Wang, Xiao Li Wang
Fig.5 Data acquisition circuit Relay action circuit.When the number of particles from the chute was the same with a preset value, the relay circuit controlled flipping of the flap, so that the particles packaged accurately.
Software design of automatic counting machine System monitoring program using a modular structure, composed by the main program and a number of functional modules subroutines, which made the program clear, easy knitting and easy to read, easy to debug and modify.
Using Fine-Grained Infrared Positioning to Support the Surface-Based Activities of Mobile Users[J], Proceeding of the 25th, IEEE International Conference on Distributed Computing systems Workshop, 2005
Online since: June 2015
Authors: M.C.A. Nono, E.G.L. Rangel, S.L. Mineiro, Pedro José Castro
The characteristic equation (Eq. 1) proposed by Hakki and Coleman [7] relating resonant frequency, dielectric constant (or electric permittivity) and resonator dimensions for electromagnetic TE011 mode is: (1) where: (2) (3) k1 = wave number inside the DR; k2 = wave number outside the DR; J0(k1a) = Bessel function of order 0; J1(k1a) = Bessel function of order 1; K0(k2a) = modified Bessel function of order 0; K1(k2a) = modified Bessel function of order 1; y = p/H = propagation constant; c = speed of light; a = DR radius = D/2; H = resonator height; er = dielectric constant of DR; ea = dielectric constant of air; fr = resonant frequency.
Sample fr (GHz) → εr εr´ A1 5.1 ® 61.0 66.5 A2 4.8 ® 64.4 70.4 A3 5.1 ® 64.1 69.3 Other factors such as grain size, polarization and conductivity of microstructures can also affect the value of dielectric constant, though with less intensity.
Online since: November 2013
Authors: Zhao Fan, Yi Ping Chen, Dong Hai Cheng, Dean Hu
However, the long residence time, severe grain growth of diffusion bonding can lead to properties reduction of mechanical parts[2].
Since a high-temperature tensile strain is a relatively slow process, this simulation is used in the shell element, in order to ensure the normal operation of this simulation while ensuring the accuracy and efficiency of the simulation, the number of values ​​in the model simulation is uniform mesh.
The number of numerical simulation in the weld and the base material of various material property values [3] as shown in Table 1.
Online since: March 2006
Authors: Kikuo Kishimoto, Akira Shinozaki, Hirotsugu Inoue
Hiroo[4] studied the coarse-graining is applied to flexible polymer chains.
The number of the branch of model B and model C are 153, and 763.
In the case of the number of branch increases (Fig. 11 (d)), the stress does not decrease.
Online since: September 2007
Authors: Katsuhiko Sasakir, Tsuyoshi Mayama, Yoshihiro Narita
The clarification of the relationships between these traces and inelastic deformation leads to develop physically based material models for general loading condition with a small number of parameters.
Comparing Fig.5 with Fig.6 it can be found that CP-Ti shows more significant surface morphological change at the same inelastic strain while the larger number of slip bands inside grains in SUS316L can be observed.
Online since: July 2008
Authors: A. Kiet Tieu, Hong Tao Zhu, Cheng Lu, Yuan Gao
The effects of point defect (impurity cluster) and surface defect (grain boundary) have been studied [4-6].
Molecular dynamic analysis In molecular dynamic simulation the motion of a large number of atoms is described by Newton's law: t m i 2 ii ∂ ∂ == r af (1) where f is the force on the atom, m the mass, a the acceleration, r the position of the atom, t the time and i represents the ith atom.
The force fi is calculated by the differentiating the potential function (E), namely i N 21 i ),,,(E r rrr f ∂ ∂ −= L (2) where N is the number of the atoms.
Online since: June 2013
Authors: Antônio Augusto Couto, Carlos de Moura Neto, Nara Miranda Guimarães, Felipe Rocha Caliari, Kátia Cristiane Gandolpho Candioto, Danieli Aparecida Pereira Reis
The conditions input to null the freedom degree of the system were: - Pressure: 1.105 Pa - Temperature: 500-1400°C - Number of mol for the system: 1 - Components: Cr, Nb, Mo and Ti; with the following composition: ________________________________________________________________________________ W(Cr) = 0.1839 W(Fe) = 0.1887 W(Mo) = 3.01e-2 W(Al) = 4.8e-3 W(Ti) = 9.5e-5 W(Co) = 2.3e-3 W(Nb) = 5.05e-2 ______________________________________________________________________________ Figure 1 presents the heat treatment applied on Inconel 718, the high solid solution temperature was chosen to optimize the creep behavior, followed by two aging steps: first at 955ºC and then a second aging step of 720ºC/620ºC, to promote precipitation of additional quantities of γ’ and γ”.
Each line number along the graphics corresponds to a phase or state of matter, as follow: 1-fcc matrix, 2-Ni3Nb, 3-Ni3Ti, 4-Sigma, 5-Liquid, 6-bcc, 7-Phase r Figure 2: Stability of phases over temperature range.
The precipitate is located on the grain boundary.
Online since: April 2007
Authors: Con Jiang Tu, Wen Jian Weng, Ge Shen, Gao Rong Han, Pi Yi Du, Gang Xu
It is observed that the crystal grain is larger than 10µm and there are some microcracks, which is a typical microstructure of aluminum titanate ceramics, resulting in the low thermal expansion and poor fracture strength.
Acknowledgment This work was supported by the Chinese National Key Project for Fundamental Research under grant number 2002CB613302 and the National Science Foundation of China under grant number 50452003.
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