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Online since: September 2014
Authors: Nataliya A. Gavrilenko, Mikhail A. Gavrilenko, Alisher A. Bilyalov
Their large number made possible conduct several simultaneous studies at the same reservoir.
Thus, to increase the number of tracers, the spectral characteristics of existing dyes should be taken into account.
The sand was taken with a grain size of 0.5 to 2.5 mm.
The ratio of the tracer number to the initial concentration, % Substance Sample 1 Sample 2 Sample 3 Sample 4 1,5 NDSA 21.71 5.23 4.50 4.07 Sodium Naphtionate 0.49 0.49 0.52 0.60 2 -NSA 39.35 24.90 21.78 22.72 Fluorescence spectra of Rhodamine B(C) were not included in the calculation, as they were superimposed on the fluorescence spectra of Rhodamine WT, and a simultaneous detection without a chromatographic separation was difficult.
Thus, to increase the number of tracers, the spectral characteristics of existing dyes should be taken into account.
The sand was taken with a grain size of 0.5 to 2.5 mm.
The ratio of the tracer number to the initial concentration, % Substance Sample 1 Sample 2 Sample 3 Sample 4 1,5 NDSA 21.71 5.23 4.50 4.07 Sodium Naphtionate 0.49 0.49 0.52 0.60 2 -NSA 39.35 24.90 21.78 22.72 Fluorescence spectra of Rhodamine B(C) were not included in the calculation, as they were superimposed on the fluorescence spectra of Rhodamine WT, and a simultaneous detection without a chromatographic separation was difficult.
Online since: August 2012
Authors: Zhu Xing Tang, He Zhang, Hui Hui Tan, Ying Zhang, Ke Zhou Xu
When the temperature between 1700℃ and 1800℃, conversion ratio increased rapidly, illustrated that a large number of AlN had formed and grown up.
With the increase of synthesized temperature, the number of Al2O3 diffraction peaks reduces and its intensity decreases, but the number of AlN diffraction peaks enhances and its intensity increases, and the peaks’ width of AlN become narrower.
The main reason is that high temperature is conducive to the growth of grains.
With the increase of synthesized temperature, the number of Al2O3 diffraction peaks reduces and its intensity decreases, but the number of AlN diffraction peaks enhances and its intensity increases, and the peaks’ width of AlN become narrower.
The main reason is that high temperature is conducive to the growth of grains.
Online since: November 2012
Authors: Guo Hui Wang, Xiao Ying Zhang, Dan Liu, Xin Hua Deng
Rubber hardness test: sample thickness is 6mm, and each of samples have to test five times and take the median of the five number.
Contrast to three fire retardant, all the shore durometer number increased by about 40%, the MHSH can make LSR tensile strength increased by 19.8%, the MHSH-1 can make LSR tensile strength increased by about 32.2%, the tensile strength of the MHSH-1/OMMT is the best, increased by 42.4%, reaching 12.79.
The MHSH does not contain the defects which the normal materials have, such as grain boundaries, dislocations, holes, etc).
Table 2 The effect of flame retardants on the mechanical properties of LSR Mechanical Performance LSR MHSH MHSH-1 MHSH-1/OMMT Tensile strength (MPa) 8.98 10.76 11.87 12.79 Breaking elongation (%) 517 337 351 379 Shore durometer number (A) 40 55 56 56 Conclusions By analyzing and comparing the combustion performance and mechanical properties of three flame retardant liquid silicone rubber compound, we can get the results that the MHSH-1/OMMT can improve the tensile strength of LSR, and have a unique advantage in improving the flame resistance of LSR.
Contrast to three fire retardant, all the shore durometer number increased by about 40%, the MHSH can make LSR tensile strength increased by 19.8%, the MHSH-1 can make LSR tensile strength increased by about 32.2%, the tensile strength of the MHSH-1/OMMT is the best, increased by 42.4%, reaching 12.79.
The MHSH does not contain the defects which the normal materials have, such as grain boundaries, dislocations, holes, etc).
Table 2 The effect of flame retardants on the mechanical properties of LSR Mechanical Performance LSR MHSH MHSH-1 MHSH-1/OMMT Tensile strength (MPa) 8.98 10.76 11.87 12.79 Breaking elongation (%) 517 337 351 379 Shore durometer number (A) 40 55 56 56 Conclusions By analyzing and comparing the combustion performance and mechanical properties of three flame retardant liquid silicone rubber compound, we can get the results that the MHSH-1/OMMT can improve the tensile strength of LSR, and have a unique advantage in improving the flame resistance of LSR.
Online since: July 2015
Authors: Dan Xia Li, Wan Xia Huang, Lin Wei Song, Qi Wu Shi
It can hold stable MIT switching properties after a large number of thermal cycles (more than 102).
And yet, the increase of the grain size by thermal influence will still have an impact on the phase transition.
The tested film was homogeneous and compact with grain size about 50 nm.
The phase transition in VO2 thin film can maintain well after a huge number of thermal cycles.
Grain size effect on the semiconductor-metal phase transition characteristics of magnetron-sputtered VO2 thin films.
And yet, the increase of the grain size by thermal influence will still have an impact on the phase transition.
The tested film was homogeneous and compact with grain size about 50 nm.
The phase transition in VO2 thin film can maintain well after a huge number of thermal cycles.
Grain size effect on the semiconductor-metal phase transition characteristics of magnetron-sputtered VO2 thin films.
Online since: April 2007
Authors: Feng Hou, Ting Xian Xu, Miao Jiang
Since pure Si3N4 can not be sintered without sintering additive because of the chemical bonds
between silicon and nitrogen, a number of studies had been carried out to get an appropriate sintering
additive to attain compact sample at a low sintering temperature [3].
Both two samples were the composite of Si2N2O as the main phase, which was identified with JCPDS number of 751539 for rhombic phase, with little SiO2 and MgAl2O4.
It was believed that the reaction was only occurred in the early stage of annealing, and the Si2N2O grain growth rate was relative high because of the fast diffusion of nitrogen and oxygen atoms in the liquid phase [5].
Fig. 4 and Fig. 5 were SEM photos of sample A and sample B sintered at 1490°C, which showed a number of pores in the fracture layers.
Both two samples were the composite of Si2N2O as the main phase, which was identified with JCPDS number of 751539 for rhombic phase, with little SiO2 and MgAl2O4.
It was believed that the reaction was only occurred in the early stage of annealing, and the Si2N2O grain growth rate was relative high because of the fast diffusion of nitrogen and oxygen atoms in the liquid phase [5].
Fig. 4 and Fig. 5 were SEM photos of sample A and sample B sintered at 1490°C, which showed a number of pores in the fracture layers.
Online since: June 2017
Authors: Suparut Narksitipan, Nittaya Jaitanong, Kantamard Lamasai
Aluminium dross showed phase of Ca12Al14O33 and TiO2, which corresponding with JCPDS number 48-1882 and 23-1446 respectively.
It was found that the XRD patterns revealed mainly phase was calcium hydroxide (Ca(OH)2) (JCPDS number 72-0156) and calcium silicate hydrate (CSH) (JCPDS number 75-2192) all samples.
Because of adding the aluminium dross tendency cause total porosity and many undersized grains distributed on the inner pore surface.
It was found that the XRD patterns revealed mainly phase was calcium hydroxide (Ca(OH)2) (JCPDS number 72-0156) and calcium silicate hydrate (CSH) (JCPDS number 75-2192) all samples.
Because of adding the aluminium dross tendency cause total porosity and many undersized grains distributed on the inner pore surface.
Online since: April 2021
Authors: Mohit Mittal, Kanchan Phutela, Rajiv Chaudhary
Therefore, the number of composite samples was developed by varying the filler weight percentage (15%, 25%, 35%, and 45%) in an epoxy polymer.
Agricultural waste in the form of walnut shell was characterized by the determination of grain size.
Fig. 1 Grain size distribution of walnut shell Density: To fulfill the market demand for lightweight materials, the developed biocomposite was characterized for density measurement as a special function of filler weight fraction.
Agricultural waste in the form of walnut shell was characterized by the determination of grain size.
Fig. 1 Grain size distribution of walnut shell Density: To fulfill the market demand for lightweight materials, the developed biocomposite was characterized for density measurement as a special function of filler weight fraction.
Online since: December 2012
Authors: Zhao Xu
Figure.3 shows the total (aggregate) received throughput as the number of UDP senders are increased and, correspondingly, the number of TCP senders are decreased.
Finally, Figure.3 plots the average per-flow TCP throughput, i.e. the total netperf TCP throughput divided by number of TCP flows.
A number of TCP improvements to address the In cast problem, concluding that while throughput sometimes improved, none of them substantially prevented TCP throughput collapse.
The central coordinator issues transmission directives to individual nodes at fine-grained timescales (every few milliseconds to temporally separate transmissions competing for bottleneck links.
This reduces the number of packets dropped in the network and prevents throughput collapse.
Finally, Figure.3 plots the average per-flow TCP throughput, i.e. the total netperf TCP throughput divided by number of TCP flows.
A number of TCP improvements to address the In cast problem, concluding that while throughput sometimes improved, none of them substantially prevented TCP throughput collapse.
The central coordinator issues transmission directives to individual nodes at fine-grained timescales (every few milliseconds to temporally separate transmissions competing for bottleneck links.
This reduces the number of packets dropped in the network and prevents throughput collapse.
Online since: November 2014
Authors: S.K. Tripathi, Ramneek Kaur, Mamta Rani
Also increase in grain boundaries, can arrest propagation of defects, when material is stressed, thus giving it strength.
If grain size becomes small, the interface area within material greatly increases, which enhances its strength.
Due to grain boundary scattering, electrical conductivity of nanocrystalline materials is found to be lower, than that in the coarse grain material of same chemical composition, because the larger fraction of atoms lies at grain boundaries.
In solids, N is very large, resulting in a large number of orbitals [40].
Hahn, Phase characterization and stabilization due to grain size effects of nanostructured Y2O3, Nanostruct.
If grain size becomes small, the interface area within material greatly increases, which enhances its strength.
Due to grain boundary scattering, electrical conductivity of nanocrystalline materials is found to be lower, than that in the coarse grain material of same chemical composition, because the larger fraction of atoms lies at grain boundaries.
In solids, N is very large, resulting in a large number of orbitals [40].
Hahn, Phase characterization and stabilization due to grain size effects of nanostructured Y2O3, Nanostruct.
Online since: September 2013
Authors: Zheng Liu, Feng Wang, Ping Li Mao, Ji Bao Li
Introduction
Because of the large numbers of excellent properties such as low density, high specific strength, high heat conductivity, good damping capacity and machinability, magnesium (Mg) alloy is widely used in the areas of aircrafts, 3C products, national defense, and automobiles and so on[1-2].
It has been found that there are lots of spheroidal, shot rod-like, banding and net structure phases in the matrix and along the grain boundary, and the morphologies of second phases are changed from diversity to unity of net structure with the decrease ratio of Zn/Y.
Acknowledgements Thanks for “The General Program of Liaoning Province Committee of Education (program number: L2012035)” and the 12th Five-Year National Science and Technology Support Program (program number: 2100BAE22B01) for funding supporting the experiment.
It has been found that there are lots of spheroidal, shot rod-like, banding and net structure phases in the matrix and along the grain boundary, and the morphologies of second phases are changed from diversity to unity of net structure with the decrease ratio of Zn/Y.
Acknowledgements Thanks for “The General Program of Liaoning Province Committee of Education (program number: L2012035)” and the 12th Five-Year National Science and Technology Support Program (program number: 2100BAE22B01) for funding supporting the experiment.