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Online since: August 2024
Authors: Refat El-Sheikhy, A. Al Khuraif
They are collected and classified, then granulated and grained to powder.
Fig. 5 Computerized lab station operating co-rotating twin screw extruder, and CPNC nanocomposite samples   4.Clay polymer nanocomposite and palm tree fiber The product material of the extruder is in the form of grains or powder.
The materials are collected and classified and grained to powder.
The produced Bio-CPNC material of the extruder is in the form of grains or powder.
Acknowledgments The authors extend their thanks to Researchers supporting project number ( RSP2024R31), King Saud university, Riyadh, Saudi Arabia.
Online since: July 2020
Authors: Ahmed R. Alhamaoy, Ghanim Sh. Sadiq, S.N. Ali, Furat I. Hussein
The results show that applying 500 mJ pulse energy yields a noticeable effect on enhancing the fatigue strength by increasing the required number of cycles to fracture the sample.
Fatigue tests show that nonferrous materials do not exhibit knee point and well-defined endurance limit in the stress-number of cycles to failure (S-N) curves [4, 5, 6].
As it can be seen the untreated samples show a finite number of cycles before fracture when compared with the treated samples for both cases G2 and G3.
Figure 7 presents the plot for cyclic fatigue results for the stress versus the number of cycles to failure (S-N curve).
The process of LSP has increased the fatigue strength of the sample surface, which is indicated by increasing the number of cycles, due to increasing the residual stresses, thus reducing the likelihood of crack formation at the surface as well as insertion of a number of barriers for crack propagation due to compressing and flattening of the grains.
Online since: March 2009
Authors: George D. Quinn
Preston's 1926 paper elicited a number of comments that were published in the Journal of Glass Technology in 1927.[17] Preston replied with further comments on "flaws."
Preston continued to publish regularly with as many as 200 papers on glass and a like number on ornithology, geology, ecology, and even politics!
Prior to their work, there were a number of conflicting and incomplete stress intensity factor solutions.
Micro analytical tools, such as micro Raman spectroscopy, scanning electron microscope electron backscattered diffraction, and energy dispersive by x-ray micro analysis, should be used to analyze the between-grain interface and within-grain stresses and their effect on crack propagation and flaws.
Rice: Mechanical Properties of Ceramics and Composites, Grain and Particle Effects, Marcel Dekker, New York, 2000
Online since: April 2013
Authors: Joseph Stokes, Mahfujur Rahman, Tuty Asma Abu Bakar
Nevertheless, some research has identified the deposition of crystalline NiTi coating via its non-equilibrium amorphous state and followed by a crystallisation process (two step processes) producing extremely grains of NiTi [3].
A large number of studies were conducted on various aspects of annealing in the equi-atomic NiTi alloy coatings [4-5, 10].
However, only a limited number of studies were conducted using the Ni rich NiTi coatings.
This phase was indexed in accordance with the reference powder diffraction file (PDF) number 18-0899 (J.C.P.D.S).
The presence of a Ni3Ti phase (PDF number: 05-0723) was detected with peaks at 2θ  equal to 40.8°, 43.7°, 46.5° and 53.2°, corresponding to the Ni3Ti (2 0 0), Ni3Ti (0 0 4), Ni3Ti (2 0 2) and Ni3Ti (2 0 3) crystal planes respectively.
Online since: May 2012
Authors: Zhao Feng Lei, Bang Yan Li, Xu Li Lei, Lun He
These parks have all been launch, a number of major construction projects are in an orderly manner.
In 2010, the city's grain output reached 1.651 million ton, an average annual increase is 10 million tons.
At the end of 2007, the city mileage is 25,481 kilometers, which is 3.8 times of the length in 1978, cargo turnover is 3.82426 billion tons kilometers, which is 35.5 times of the number in 1978, passenger turnover is 283,872 million kilometers, which is 23.6 times of the number in 1978, total postal business income is 1.637 billion yuan, which is as 1036 times as what in 1978.
The development of Yulin energy resources come into large numbers of waste gas, water and residue, there are serious influence of People's Daily production and life.
Online since: February 2017
Authors: Astrid Pundt, Vladimir Burlaka, Kai Nörthemann
This is not only attributed to the different microstructure (surface and interfaces, grain boundaries, dislocation etc.) but also to the different stress and strain condition of the film [1-3].
But, the lower pressure conventionally should result in a smaller number of nuclei and, thus, a slower transformation kinetic [21].
While a small number of large hydrides is found in the in (semi-) coherent state, a large number of small hydrides is found in the coherent state.
In contrast to this, in the 25 nm film of Fig. 2, the hydride size is just about 100 nm and hydrogen uptake mainly leads to an increasing number of hydrides.
Online since: April 2014
Authors: Li Jun Yang, Xin An Dang, Ze Hui Zhang, Lin Li
Metal produce a large number of atoms in the ion rapid evaporation, but before these atoms arrive in substrate, the atoms can’t be completely ionized.
As the current increases, the number and size of particles significantly increase.
Because of the reduction of particle number and size, the raised surface film barrier greatly reduces, the friction coefficient decreases in the process of friction and wear, at the same time, spalled grains causes dramatic changes in the surface morphology of films, the particle size and number which in the film is rarely, the fluctuation of friction coefficient decreases.
Online since: July 2003
Authors: P. Lin, Chun An Tang
Although the rock can be regarded as an isotropic elastic-brittle solid at macrolevel, while the individual grains in rock are distinguished at micro-level or meso-level [12].
It can be written as following Eq.(3): c t c r c D ε ε ε ε ε ε ε ε εξ ε ≤ ≥ ≥ ≤      ⋅ = , , , 1 0 )( (3) Fig.2 Thermoelastic damage model of RVE S S σ ε0 ε St Fig.1 Density function of RVE strength h=30 h=10 h=1.1 h=6 h=3 Journal Title and Volume Number (to be inserted by the publisher) 3 where εc and εc are the strains at peak strength under compression and tension, respectively; ξ is the coefficient of residual strength under compression.
The total number of loading and unloading steps is 720.
During reloading up, the number of broken elements is not increased till the loading reaches the maximum stress level of last cycle (see Fig.4b).
The prolongations of the paths of all the cyclic loading trend to the 5th Cycle 3 rd Cycle 2nd Cycle Percentage of strength (%) Percentage of strength (%) 0 16 32 48 86 100 Fig.4 Numerical results of AE counts vs. percentage of strength 1st Cycle 6th 4th Cycle 60 0 16 32 48 86 100 60 70 50 30 10 0 60 40 20 70 50 30 10 0 60 40 20 70 50 30 10 0 60 40 20 AE counts (time) AE counts (time) AE counts (time) Fig.5 Experimental curves of AE counts under cycle loading Percentage of strength (%) Percentage of strength (%) AE counts (×1000) AE counts (×1000) AE counts (×1000) AE counts (×1000) Journal Title and Volume Number (to be inserted by the publisher) 5 original point of coordinate.
Online since: April 2011
Authors: Carlos José de Araújo, Antonio Almeida Silva, Bruno Allison Araújo, Gabriel Dias Travassos, Eudésio Oliveira Vilar, Jorge Palma Carrasco
It is known that alloys designed to resist to hydrogen embrittlement must have a large number of harmless trapping and that these should preferably be irreversible and well distributed through the microstructure [8].
Additions of elements that are carbides formers, which are used for grain refinement, precipitation hardening and improves the toughness, also provide irreversible trapping for hydrogen.
The main features are the largest number of dimples in API 5L X60 steel and the presence of cracks on the fracture surfaces of API 5L X80 steel.
It can be noted that the effect of hydrogen was to increase the number of dimples in the hydrogenated samples, and this effect was more pronounced in the API 5L X60 steel.
Hydrogen accumulates in particle-matrix interfaces, which in turn contributes to the reduction of interfacial resistance of the particles, causing a larger number of dimples.
Online since: December 2011
Authors: Fang Ying Ji, Jun Ren Zhu, Ming Zhuo Tan, Yong Jun Sun, Shu Xiang Miao, Xiao Kai Zheng, Zhen Zhen Jiang, Huai Li Zheng
A large number of tailings have been produced from concentrator, without proper dealing with them that should inevitably lead to serious environmental pollution, ecological damage and safety issues[1].
But this production method needs a large number of organic solvent, higher production cost, and more complex technology.
And a number of organic or inorganic dispersion stabilizers are used, which affected the purity of CPAM.
However, fine grains linked into the tighter floc in tailings because of excessive use of polyacrylamide, which had a negative impact on the stability of tailings dams.
Our research group carried out a number of preparation and application research of CPAM[24-25], included that the synthesis of cationic polyacrylamide by dispersion polymerization.
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