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Online since: June 2012
Authors: Wan Qi Jie, Qi Tang Hao, Qiang Li
,is widely used in the production of large sized complex thin walled castings in aerospace and automotive manufacturing, and other fields [1] because the parts produced by this method are of high quality, low shrinkage porosity, fine grains, etc.
In recent years, with the rapid development of intelligent control technology, as the representative of the control object in a number of complexes, nonlinear, time-varying and large inertia of the system, fuzzy control intelligent control technology has been widely used.
The fuzzy inference rule is if X1 is A1i and X2 is A2i then Y is Bi (3) where X1 and X2 respectively represent the error and error change rate; Y is the opening output; A1, A2 and B are the fuzzy language value; iis the number of statements, as shown in Table 3.
The total number of rules is 49.
Thus, the results of KP (KI and KD are similar) are Rx,y=i-1n(A1i×A2i)×Bi (4) Defuzzification of output The centroid method is used to implement defuzzification, and the value of the fuzzy control output is given by u*=jkjuj/jkj (5) wherej is the rule number.
Online since: January 2020
Authors: Xing Sheng Li, Yong Sun, Hua Guo
Introduction A great number of researches have been conducted on the application of Thermally Stable Diamond Composite (TSDC) in making rock cutting tips [1-7], because TSDC has much higher wear resistance than Tungsten Carbide (WC) [2] and much higher thermal stability than polycrystalline diamond composite (PCD) [3].
The properties of the high thermal stability and wear resistance of TSDC is due to that TSDC is made of synthetic diamond grains using ceramic-based silicon as the binder material during the sintering process [2-3].
Directly estimate the reliability of the tips, R, by calculating the relative frequency of tip failures and using the relationship between the failure probability and reliability: RL=1-FL=ns/Np , (1) where, RL and FL are the reliability and failure probability of the tip after cutting L mm long rock, respectively; ns is the number of the survived tips after cutting L mm long rock and Np is the number of the total tips used in the cutting tests. 3.
Nevertheless, to improve the estimation accuracy, both approaches require a large number of failure data based on accelerated life tests, which are often costly and time-consuming.
Online since: April 2020
Authors: Wei Li, Dong Yang Li, Yu Hao Song, Cheng Liu
At this time, due to the increase in the crystallization rate of amorphous silicon, the number of nanocrystalline Si particles increases and the micro- nanostructures in the surface morphology of the film are mainly clusters of Si nanoparticles (Fig. 2(c)).
At this time, the size of Si particles and the crystallization rate also gradually decrease from the center to the edge of the laser spot area, the grain size of Zone I is 9.2 nm and the crystallization rate is 43.6 %.
When the laser energy is further increased to 600 mJ/cm2, the intensity of Si (111) in the diffraction peak increases to some extent, indicating the number of Si particles increases.
If we continue to apply 600 mJ/cm2 laser energy on a-Si:Al thin film, the crystallization rate of a-Si:Al thin film can further be enhanced, and the number of Si particles increases obviously, while the size of Si particles does not significantly increase (kept at about 10 nm).
It can be understood that with the increase of femtosecond laser energy, the number of crystal silicon particles in a-Si:Al thin film gradually increases, and the refractive index of the thin film as a whole is gradually close to the poly-crystalline silicon, so that the interference peak is gradually suppressed.
Online since: July 2024
Authors: Lucy W. Kariuki, Bernard W. Ikua, Samuel K. Karanja, Stephen P. Ng'ang'a
In their study, two FDM parameters were taken into account, namely, the building direction and the number of contours.
Due to the large number of printing parameters involved in FFF, optimizing the printing parameters for all viable materials using experimental methods would be challenging.
The pseudo grains are comprised of fibres aligned in the same direction.
Illustration of pseudo-grain material modelling for short fibre-reinforced composites Design of the structural models.
This can be attributed to a reduction in the overall number of layers required to build the part, thus less occurrence of thermal gradients between layers.
Online since: June 2009
Authors: Siddhartha Shrivastava, Debabrata Dash
The number of functional foodstuff delivery systems is expected to increase sharply over the next few years.
The word "Kam" means deep purple, and the rice variety is known for its purple stem, leaves and grains.
Using nanotechnology, the scientists changed the colour of the leaves and stems of Khao Kam from purple to green and the grain becomes whitish.
This bar code is essentially a sticker having a number of black and white bars with certain digits written at the bottom.
Lack of finances also limits the number of inspectors that can be employed at these critical control points.
Online since: April 2009
Authors: David J. Young, M.A.A. Motin, J. Zhang
The precipitate distributions are consistent with such a process: the precipitate-free zones beneath the scale-metal interfaces and surrounding grain boundaries reflect preferred nucleation at these internal surfaces.
Carbon dissolves in and supersaturates the metal, leading to graphite precipitation at or immediately beneath the surface and at interior grain boundaries.
Assuming the effect of copper is to reduce catalytic activity by replacing nickel, and that each catalytic site involves a number of near neighbours nickel atoms [31-33], then the number of atoms is given by n.
Online since: July 2022
Authors: Stefan Carosella, Peter Middendorf, Florian Helber
It was a white, solid epoxy resin powder based on Bisphenol-A with a grain size between 90 – 125 µm and an activation temperature of 102±5 °C.
It is a solid, Bisphenol-A based, high molecular weight epoxy resin and comes as a white powder with a grain size between 160 – 200 µm.
For each test series a minimum number of five samples was tested.
For E5390 an insufficient number of valid samples has been measured, so it cannot be considered in the evaluation.
Online since: February 2009
Authors: Ricardo Gómez, Vicente Rodríguez-González, F.M. Morán-Pineda, S. Castillo, R. Zanella
The average particle diameter (ds) was calculated by using the following formula: ds =∑nidi/∑ni, where ni is the number of particles of diameter di.
The mean particle size of the 80 82 84 86 88 90 92 94 Binding Energy (eV) Intensity Au 4f 5/2 Au 4f 7/2 Auº Auº Au2O3 Au2O3 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Au wt (%) Au/TiO 2 -Al 2 O 3 Au/P25 Au/TiO 2 Au/TiO 2 -In 2 O 3 45 50 55 60 65 1 2 3 4 Analysis number Ti wt (%) Au/TiO 2 -Al 2 O 3 Au/P25 Au/TiO 2 Au/TiO 2 -In 2 O 3 Figure 4.
Band-gap energy, mean grain size and mean gold particle size for the gold supported semiconductors.
Material Eg (eV) Plasmon Absorption (nm) Mean grain size (nm) Mean gold particle size (nm) P25 3.10 -- - - TiO2 3.13 -- - - TiO2-In2O3 3.5 -- - - TiO2-Al2O3 3.23 -- - - Au1/P25 2.68 564 31 3.8 Au1/TiO2 2.74 546 20 4.4 Au1/TiO2-In2O3 2.83 - 12 2.4 Au1/TiO2-Al2O3 3.10 - 10 2.7 gold nanoparticles which were obtained from the HRTEM micrographs is reported in Table 2.
Online since: April 2025
Authors: A. Shirley Stevany Faryl, K. Rajeshwaran, G. Sekar, Joghee Prasad
Literature reviews on multiplier designs examines a number of multiplication methods, including the shift and add multiplier, array multiplier, row/column bypassing multiplier, Dadda multiplier, and braun multiplier.
Circuits can be pipelined at an extremely fine-grain level by balancing the intrinsic RC delays of the combinational logic units, which synchronizes internal computations. [11] To obtain better power and performance improvements, the wave pipeline system is modified into hybrid pipelining architecture which uses intermediate registers partially.
Circuits can be pipelined at an extremely fine-grain level by balancing the intrinsic RC delays of the combinational logic units, which synchronizes internal computations [12].
In comparison to a normal pipeline, the pipelined multiplier's implementation requires a considerably fewer number of flip-flops due to its low latency.
Online since: February 2020
Authors: L.G. Marques, Manoel Marcelo Prado, Raí M. de Oliveira, Keyse S. Andrade
IR radiation is then recommended for drying grains in a single thin layer [4,7].
Spite of large number of works dealing with combined infrared and hot-air drying, few studies [7] are devoted to provide information on the use of IR radiation assisted by non-heated air convection, what could contribute to save energy and improve product quality.
Thus, the total number of nineteen experimental runs were required, with duplicate in the maximum and minimum variables levels and triplicate in the center point.
The finding obtained in this work is not in agreement with the finding of Brandão et al. [7] who reported a reduction in Deff-values with an increase of the non-heated air velocity in the hybrid drying of pollen grains.
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