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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].
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.
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.
Online since: August 2018
Authors: Xiao Bo Bai, Shi Bin Li, Hong Ying Ru, Jie Guang Song, Zhi Hai Yi
Introduction Among ultra-high temperature ceramics(UHTCs), ZrB2 and ZrB2-based composites are of particular interest because of the unique property combination of high refractoriness, high-electrical and high-thermal conductivity, chemical inertness against molten metal or non-basic slag and good thermal shock resistance[1, 2], which make it attractive candidates for high-temperature applications where corrosion-wear-oxidation resistance is demanded, because of its higher cost of production, has found a limited number of applications.
Refractory oxides, such as alumina, zirconia, yttria and mullite, show the best resistance in those aerobic environments, and a number of these have been evaluated as coating for other ceramics[8].
The uncoated ZrB2 samples surface micrograph was showed in Fig.4, it can be seen that the ZrB2 grain boundary became smooth and there was about 5-6% open porosity on the surface, meeting with the as received composites having 95% relative density.
Online since: August 2014
Authors: Guo Bin Ji, Yan Hua Wang, Fei Min Zheng
Ruan Benqing6(1998)defined it that the water quantity (itself) in certain areas with direct or indirect way of resources can continue to support the number of people in ensuring the normal social cultural norms of material life level in different time scales in the future and some production conditions.
Varis 14(2001)took the development and utilization of water resources as the core, and analyzed the pressure resulted from the increasingly rapid industrialization, growing demand for grain growth and environmental degradation and so on in Yangtze River area, and compared the social and economic status of the Yangtze River basin with the carrying capacity of water environment preliminary by consulting to the development history in different areas. 2.2 The research progress at home The study of water resources carrying capacity in China began in the late 80s, domestic scholars through a series of research projects and work, gained great progress and some preliminary results.
In the rain and flood season, on the one hand, to ensure the security of the reservoir, the reservoir has a great number of drainage; on the other hand, the water down through the river which leads to dry and lacking of water.
Online since: January 2021
Authors: Mohammed Seyf Eddine Bougoffa, Chahrazed Benouali, Tahar Sayah, Mohamed Nabil Bachirbey
- An established phase, reached by stability of the operating conditions at the interface (number of wear particles torn off becomes constant).
The results obtained suggest a certain number of deductions, described below.
[4] Jarosław CHMIEL, Jarosław ŚMIECHOWSKI, Marcin JASIŃSKI and Małgorzata SZYSZKO, Selected Issues of Corrosive - Mechanical Wearin the Port Grain Elevator, Solid State Phenomena, Vol. 252, pp 41-50
Online since: January 2017
Authors: Lei Liao, Mei Ping Wang, Ai Miao Qin, Ning Tian, Kai You Zhang
Then, the fine-grain of sisal fiber carbon was prepared by the ball-milling dispersion method under 400 rpm for 12 h.
In Fig. 1(f), the SFC shows a multiple-peaked pore size distribution centered on 0.50, 0.59, 0.80, 1.17 and 1.48 nm, which indicates that the SFC has a large number of micropores, while the Horvath–Kawazoe pore size distribution curve of the CMSFC indicates a few mesoporous characteristics.
Fig. 3(a) shows that the SFC possesses a typical honeycomb structure with a large number of microscale macropores.
Online since: July 2020
Authors: Shuo Yin, Ji Yun Liu, Cheng Lu, Meng Wang, Yi Qiao Wang, Li Bo Zhang, Yang Zhang, Yun Bo Chen, Lin Chen, Ling Li Zuo
The ways of doping supervalent cations, synthesis of nanocrystalline grains and electronic conductive carbon coating have been regarded as effective methods to enhance its electronic conductivity and Li-ion diffusivity rate[5].
The diffusion coefficient of lithium ions (D ) can be calculated from the slop in the low frequency region according to the following equation[11]: D=R2T22A2n4F4C2σ2 (1) C is the concentration of lithium ions in the materials, R is the gas constant, T is the absolute temperature, F is the Faraday constant, A refers to the electrochemically active surface area, n stands for the number of electrons per molecule during redox process, σ is the Warburg factor which can be obtained by the following equation[11]: Zˊ= Rs+ Rct+σω1/2
Table 1 Test results of soft-packed batteries Simple internal impedance mΩ Capacity Ah Formation efficiency % capacity of the LiFePO4/C composite at 0.3C(mAh/g) Constant current ratio % a 4.40 5.543 88.3% 137.1 97.5 b 4.49 5.472 88.0% 134.5 97.1 c 4.33 5.513 87.9% 135.0 97.4 average 4.41 5.509 88.1% 135.5 97.3 Fig. 6 The V-SOC curves of LiFePO4/C soft-packed cells Table 2 Capacity and capacity retention of LiFePO4/C soft-packed cells Simple Capacity(Ah) Capacity retention (%) 0.3C 0.5C 1C 2C 3C 0.3C 0.5C 1C 2C 3C a 5.543 5.482 5.332 5.094 4.978 100% 98.9% 96.2% 91.9% 89.8% b 5.472 5.412 5.278 5.063 4.948 100% 98.9% 96.5% 92.5% 90.4% c 5.513 5.460 5.334 5.120 5.008 100% 99.0% 96.8% 92.9% 90.8% Average 5.509 5.451 5.315 5.092 4.978 100% 98.9% 96.5% 92.4% 90.3% 3.1 3.12 3.14 3.16 3.18 3.2 0 10 20 30 40 50 60 70 80 90 10 0 Cycle number voltage(V) b a Fig. 7 Cycle curves(a) and average voltage change curve
Online since: September 2013
Authors: Guo Ping Yu, An Min Sun, Yu Xin Wang, Ji Bian, Rao Fu, Mu Jun Liu, Man Xu Xu
Meanwhile, rice bran (RB), a brown layer presented between rice and outer husk of paddy [1], is one of the most important co-products in the rice milling process [2], possessing approximately 8-11% weight of the total rice grain [3].It contains about 15% protein and 18%-22% lipids.
(1) Where h is the number of peptide bonds broken, htot is the total number of bonds per unit weight.
Online since: August 2015
Authors: Vijaykumar S. Jatti, Rahul Chaudhary, Tushar Gupta
The increase in hardness was attributed to uniform dispersion of B4C particles and fine grain size of the aluminum matrix.
Bhandare and Sonawane [10] prepared aluminum matrix composite by stir casting method and concluded that for the uniform distribution of the reinforcement blade angle should be 45° to 60° and number of blade should be 4 and also that at full liquid condition the uniform distribution of reinforcements is difficult and for good wet ability we need to keep operating temperature at semisolid stage and also the preheating of moulds helps in reducing the porosity and enhance mechanical properties.
Figure 3 Micro-Vickers hardness numbers Figure 4 Ultimate tensile strength of composites Tensile tests were carried out using computerized uni-axial tensile testing machine as per ASTM standards.
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