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Online since: September 2008
Authors: Zbigniew M. Bzymek, Glenn M. Duzy, Richard B. Mindek
The contact zone and the maximum number of nodal columns were calculated on the basis of the
geometry of both wheels (Fig. 1.1 and Fig. 1.2).
Plaster Casting Avg. for Location 1 Location 2 Location 3 Location 4 (µm) Wheel (µm) (µm) (µm) (µm) (µm) 12.2 13.1 12.6 14.1 11.6 14.0 Table 2.2 Comparison of Plaster Casting and Wheel Surface. 2.10 Diamond Profile A cone-shaped diamond profile was used, and the number of diamonds was set to 100, resulting in a spacing of four diamond diameters apart along the circumference of the truer.
This is explained by the limitation of the virtual model, which was designed to simulate purely kinematic and geometric interactions between the truer diamonds and the grinding wheel surface, rather than from crushing or fracturing of the grinding wheel grains and bond structure.
Plaster Casting Avg. for Location 1 Location 2 Location 3 Location 4 (µm) Wheel (µm) (µm) (µm) (µm) (µm) 12.2 13.1 12.6 14.1 11.6 14.0 Table 2.2 Comparison of Plaster Casting and Wheel Surface. 2.10 Diamond Profile A cone-shaped diamond profile was used, and the number of diamonds was set to 100, resulting in a spacing of four diamond diameters apart along the circumference of the truer.
This is explained by the limitation of the virtual model, which was designed to simulate purely kinematic and geometric interactions between the truer diamonds and the grinding wheel surface, rather than from crushing or fracturing of the grinding wheel grains and bond structure.
Online since: September 2012
Authors: Yong Bo Wu, L. Jiao, Hui Ru Guo, M. Fujimoto, K. Shimada
The MCF slurry is produced by mixing water-based MF magnetic fluid containing magnetite Fe4O3 particle, carbonyl iron powder, a-cellulose fiber and abrasive grains, hence reacting to an applied magnetic field [6].
Experimental Details At first, in order to clarify how the MCF wheel construction including the number of magnets employed and the distribution of magnetic poles affect the polishing characteristics, five types of MCF wheel a to e with different constructions were prepared as shown in Fig. 3 by employing neodymium permanent magnets with dimension of f39mm in outer diameter ´ f19mm in inner diameter ´ t7mm in width Niroku Co., Ltd.
Meanwhile, it is evident that even the number of magnet installed is the same, the highest MRR was obtained with the MCF wheel in NS-NS distribution without spacer.
Experimental Details At first, in order to clarify how the MCF wheel construction including the number of magnets employed and the distribution of magnetic poles affect the polishing characteristics, five types of MCF wheel a to e with different constructions were prepared as shown in Fig. 3 by employing neodymium permanent magnets with dimension of f39mm in outer diameter ´ f19mm in inner diameter ´ t7mm in width Niroku Co., Ltd.
Meanwhile, it is evident that even the number of magnet installed is the same, the highest MRR was obtained with the MCF wheel in NS-NS distribution without spacer.
Online since: October 2010
Authors: Yu Can Fu, Hong Jun Xu, Hong Hua Su, Bei Zhang
Table 1 The measure of wheel substrate fabrication error
Wheel substrate fabrication
Verticality
[µm]
Parallelism
[µm]
End-face
jumping [µm] Bore circularity
[µm]
Run out of step
face [µm]
Run out [µm]
wheel substrate number 1 2 1 2 1 2 1 2 1 2 1 2
after finish turning ≤1 ≤1 2 6 10 25 3 5 4 5 10 7
after wire cut of distressing holes ≤1 ≤1 10 8 13 20 4 8 ≤ 5 ≤ 5 ≤ 5 ≤ 5
after baking and step face conditioning ≤1 ≤1 6 4 10 20 5 9 ≤ 5 ≤ 5 ≤ 5 ≤ 5
after brazing without filler ≤1 ≤1 5 10 10 16 5 6 6 7 5 5
after brazing with filler ≤1 ≤1 18 14 20 16 9 11 ≤ 10 ≤ 10 - -
(a) orderly setting of
diamond abrasive
(b) design of wheel
substrate
(c) appearance of the product
of wheel substrate
Fig. 1 The designing and fabricating of wheel substrate
1.6Precision touch truing
Touch dressing Procedure.
His experiment indicates that touch dressing will increase the abrasive grain number of grinding participation and can greatly improve the workpiece finish.
His experiment indicates that touch dressing will increase the abrasive grain number of grinding participation and can greatly improve the workpiece finish.
Online since: December 2006
Authors: Shu Guo Jia, Mao Sheng Zheng, Bao Hong Tian, Ping Liu, Feng Zhang Ren
It is also evident from the micrographs that a number of parallel and continuous wear grooves exist
on the worn surface of the Cu-Ag-Cr alloy in the direction of the motion and the appearance of the worn
surface is characteristic of an abrasive wear mechanism.
In addition, a large number of small spherical droplets are observed at the bottom of the eroded pits on the worn surface.
Fig. 5 shows the fine precipitate particles dispersed within the grains in the Cu matrix, and the precipitates are fully coherent with the Cu matrix and having a size of 6~7 nm.
In addition, a large number of small spherical droplets are observed at the bottom of the eroded pits on the worn surface.
Fig. 5 shows the fine precipitate particles dispersed within the grains in the Cu matrix, and the precipitates are fully coherent with the Cu matrix and having a size of 6~7 nm.
Online since: July 2015
Authors: Kamarulazizi Ibrahim, Mohammad Hafiz Khalid, Mohd Nazalan Najimudin, Mohammad A. Al Rajhi, Hajo Idriss, Mohamed Hassan Eisa
In fact, under ideal conditions, E-coli cells can double in number after only few minutes [5].
Furthermore, a very large number of E-coli bacteria can be grown in a small space [6].
Onstotta, Kob C-HA et al (2002) Theoretical prediction of collision efficiency between adhesion-deficient bacteria and sediment grain surface.
Furthermore, a very large number of E-coli bacteria can be grown in a small space [6].
Onstotta, Kob C-HA et al (2002) Theoretical prediction of collision efficiency between adhesion-deficient bacteria and sediment grain surface.
Online since: January 2012
Authors: Shinji Kohara, Masaki Takata, L. Temleitner, Y. Ohishi, A. Fujiwara, Koji Ohara
Introduction
In the structural analysis of disordered materials, x-ray and neutron diffraction techniques are used to directly measure local and intermediate-range or nanoscale structures, atomic bond lengths and the coordination numbers by the Fourier transformation of the total structure factor S(Q) (Q = (4π/λ)sinθ, 2θ: scattering angle, λ: the photon or neutron wavelength) to a pair distribution function g(r) using the following equation,
(1)
where ρ is the total atomic number density and M(Q) is a modification function introduced to reduce termination errors in the transform.
Crystallization starts simultaneously from many such nuclei in the amorphous mark (NaCl fragments) and lead to an aggregation of small crystal grains.
Crystallization starts simultaneously from many such nuclei in the amorphous mark (NaCl fragments) and lead to an aggregation of small crystal grains.
Online since: August 2019
Authors: B.N. Anjan, G.V. Preetham Kumar
Hashim et al. [9] explained in his work that processing variables such as a number of blades on the impeller, stirring speed, shape and size of the impeller, holding temperature and impeller position are the significant factors to be considered while stir cast these parameters of casting has a major influence on various properties.
Thus, the grains grow outward from the reinforcement and remaining matrix liquid solidifies over the particles.
Fig. 5 Hardness number as a function of material composition Fig. 6 Engineering stress v/s strain for tensile samples Fig. 7 Scanning electron microscopic images of fractured tensile sample (a) ZA27 as-cast alloy (b) ZA27 5% SiC (c) ZA27 10% SiC (d) ZA27 5% Al2O3 (e) ZA27 10% Al2O3 Due to the difference in thermal expansion coefficient, during the cooling process dislocations are introduced by the ceramic particles which are the reason for improvement achieved in composite materials [16].
Thus, the grains grow outward from the reinforcement and remaining matrix liquid solidifies over the particles.
Fig. 5 Hardness number as a function of material composition Fig. 6 Engineering stress v/s strain for tensile samples Fig. 7 Scanning electron microscopic images of fractured tensile sample (a) ZA27 as-cast alloy (b) ZA27 5% SiC (c) ZA27 10% SiC (d) ZA27 5% Al2O3 (e) ZA27 10% Al2O3 Due to the difference in thermal expansion coefficient, during the cooling process dislocations are introduced by the ceramic particles which are the reason for improvement achieved in composite materials [16].
Online since: October 2006
Authors: R. Muccillo, E.N.S. Muccillo, Ivana Conte Cosentino, Flávio M. Vichi
A number of ZrO2TiO2
binary oxides prepared by the sol-gel technique have been reported [8-11].
The presence of oxygen vacancies may enhance the adsorption of water at the grain boundaries, in the form of VO-OH , which in turn give rise to mobile protons.
The consequence is an increase in the number of charge carriers [17].
The presence of oxygen vacancies may enhance the adsorption of water at the grain boundaries, in the form of VO-OH , which in turn give rise to mobile protons.
The consequence is an increase in the number of charge carriers [17].
Online since: August 2005
Authors: Xun Chen, Q.S. Liu, Nabil Gindy
The acoustic waves of grinding are mixtures of several acoustic wave sources, such as grain
fracture, coolant turbulence, materials deformation and thermal expansions.
The decomposition of a signal, whose length equals an integer power of two (N = 2p) on an orthonormal wavelet packet basis (WPB), results in the same number of coefficients as the original signal.
Any node of a binary tree is labelled by its depth j and number p of nodes that are on its left at the depth j.
The decomposition of a signal, whose length equals an integer power of two (N = 2p) on an orthonormal wavelet packet basis (WPB), results in the same number of coefficients as the original signal.
Any node of a binary tree is labelled by its depth j and number p of nodes that are on its left at the depth j.
Online since: July 2013
Authors: Xiao Na Wang, Jing Xian Liu, De Qiang Chang, Ning Mao, Xi Sun
But in special places, such as blast furnace gas filtration, high temperature flue gas dust removal, pulverized coal, grain and other bums sex dust catcher sites prone to filter bag burned and fire accident [3], filter material flame retardant performance is needed to consider in these applications.
temperature (℃) 20.5 20.5 20.5 20.5 20.5 20.5 20.5 GB6529-2008 Humidifying relative humidity (%) 62 62 62 62 62 62 62 GB6529-2008 Experime-nt condition Experiment temperature (℃) 20 20 20 20 20 20 20 GB/T17951- 2006 Relative humidity(%) 58 58 58 58 58 58 58 Air type propa-ne propane propane propane propane propane propane B1 B2 Combustion performance experiment Experimental data Warp Aferflame time(s) 77.74 4.81 0.8 0.85 1.1 0.71 0.61 ≤5 ≤15 Afterglow time(s) 0.99 0.48 0.33 0.45 0.37 0.46 0.31 ≤5 ≤10 Damaged length (mm) 171.7 44.6 15.4 19 36.6 33 11.4 ≤150 ≤200 weft Afterglow time(s) 69.34 6.57 0.78 0.84 1.63 0.67 0.62 ≤5 ≤15 Afterglow time(s) 0.91 0.54 0.36 0.44 0.33 0.34 0.31 ≤5 ≤10 Damaged length(mm) 178.7 41.2 14.6 19.2 40.8 32 10 ≤150 ≤200 Combustion characeristics Carbo- nization, shrink, liquati-on Carboni-zation, shrink Carboni- zation, shrink Carboni-zation, shrink Carboniza- tion, shrink Carbon-ization, shrink shrink Wether have drop things Yes no no no no no no Number
of burn sample 4 0 0 0 0 0 0 oxygen index method Experimental data Warp limit oxygen index (%) 21 34.9 50.5 46.3 43.6 43.4 95.2 Weft limit oxygen index (%) 21.6 35.2 50.8 46.5 44.2 43 94.6 Amount of burn through number 6 2 2 3 2 4 2 Combustion characeristics Carbo- nization, shrink, liquati-on Carboni-zation, shrink Carboni- zation, shrink Carboni-zation, shrink Carboniza- tion, shrink Carbon-ization, shrink shrink The ruslt of the vertical flame method (1) Afterflame time Under the test conditions, the afterflame time is that the ignition source removed, materials continue to burn with flame.
temperature (℃) 20.5 20.5 20.5 20.5 20.5 20.5 20.5 GB6529-2008 Humidifying relative humidity (%) 62 62 62 62 62 62 62 GB6529-2008 Experime-nt condition Experiment temperature (℃) 20 20 20 20 20 20 20 GB/T17951- 2006 Relative humidity(%) 58 58 58 58 58 58 58 Air type propa-ne propane propane propane propane propane propane B1 B2 Combustion performance experiment Experimental data Warp Aferflame time(s) 77.74 4.81 0.8 0.85 1.1 0.71 0.61 ≤5 ≤15 Afterglow time(s) 0.99 0.48 0.33 0.45 0.37 0.46 0.31 ≤5 ≤10 Damaged length (mm) 171.7 44.6 15.4 19 36.6 33 11.4 ≤150 ≤200 weft Afterglow time(s) 69.34 6.57 0.78 0.84 1.63 0.67 0.62 ≤5 ≤15 Afterglow time(s) 0.91 0.54 0.36 0.44 0.33 0.34 0.31 ≤5 ≤10 Damaged length(mm) 178.7 41.2 14.6 19.2 40.8 32 10 ≤150 ≤200 Combustion characeristics Carbo- nization, shrink, liquati-on Carboni-zation, shrink Carboni- zation, shrink Carboni-zation, shrink Carboniza- tion, shrink Carbon-ization, shrink shrink Wether have drop things Yes no no no no no no Number
of burn sample 4 0 0 0 0 0 0 oxygen index method Experimental data Warp limit oxygen index (%) 21 34.9 50.5 46.3 43.6 43.4 95.2 Weft limit oxygen index (%) 21.6 35.2 50.8 46.5 44.2 43 94.6 Amount of burn through number 6 2 2 3 2 4 2 Combustion characeristics Carbo- nization, shrink, liquati-on Carboni-zation, shrink Carboni- zation, shrink Carboni-zation, shrink Carboniza- tion, shrink Carbon-ization, shrink shrink The ruslt of the vertical flame method (1) Afterflame time Under the test conditions, the afterflame time is that the ignition source removed, materials continue to burn with flame.