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Online since: December 2012
Authors: Jun Deng, Ning Fang Yue, Xin Hai Zhang, Yong Fei Jin
Just like the regulation and control of the coal bed fire, the regulation and control of the coalfield also involve the fire zone detection and identification, fire extinguishing method, process and material, as well as the monitoring of the extinguishing effect. 4.1 Detection and identification of coalfield fire and fire zone In order to solve the difficult problem in detection of the coal bed spontaneous combustion ignition source, the countries all over the world made a great number of tests and researches on such subject on the detection principle that it is necessary to detect the variable of the physical property or chemical property of the coal body or ambient medium during the spontaneous combustion of the coal, which shall be deemed as the data reflecting the scope and degree of the spontaneous combustion.
In this article [33], combining the actual characteristics of the coalmine fire, the research is made on the detection of the underground coal method by the radon method and the influential factors. 4.2 Extinguishing method, process and material Based on the conditions for combustion of coalfield fire (i.e. inflammable goods, air leakage oxygen supply, heat accumulation expansion), the research is made mainly on the methods such as the elimination of heat (fire) source, establishment of isolation strip, and isolation (reduction) of air leakage source and so on.
Online since: March 2025
Authors: J. Gottmyers Melwyn, C. Bhagyanathan, G. Sathiyaseelan, P. Srinath
Data Analysis In this experimental investigation, yield and melt loss were calculated based on the final weight of aluminium and the formation of dross.
Reduction of Oxidative Melt Loss of Aluminum and Its Alloys. (2006).
Online since: May 2021
Authors: Kok Heng Soon, Muhammad Jahanzail Kamran, Yat Choy Wong, Elammaran Jayamani
During the analysis, mass loss can occur due to various reasons such as decomposition: breaking of chemical bonds in the microstructure, evaporation: loss of moisture from the surface, reduction: interaction of the samples with the atmosphere and desorption.
Fig. 6, shows the chart that was plotted using the data received from TGA.
Online since: April 2023
Authors: Ojiyed Tegus, Hascholu Oimod, Zhong Xiang Fu, Si Qin Bator, Han Wu, De Hao Kong, Xiao Tao Wang, Wei Li
The oxidation peak at 3.9 V corresponds to the oxidation process of Ni2+ and Co3+, the oxidation peak at 4.5 V corresponds to the partially reversible process of anion O2− and the irreversible loss process of lattice oxygen, and the reduction peak at 2.7 V corresponds to the transformation of spinel (LiMn2O4), indicating that LATP coating induces the formation of spinel phase[22].
Fig.6 (a) First charge-discharge curves of samples before and after coating, (b) Differential capacity curves of samples before and after coating Table 2 First cycle charge and discharge data of samples before and after coating Sample First charge specific capacity (mAh·g-1) First discharge specific capacity (mAh·g-1) Irreversible specific capacity (mAh·g-1) First charge and discharge efficiency (%) L-L2MO 324.2 249.5 74.7 76.97 L-L2MO1 313.1 229.8 83.3 73.28 L-L2MO2 274.9 209.5 65.4 76.25 L-L2MO3 277 213.8 63.2 77.17 L-L2MO4 271.5 215.3 56.2 79.34 3.4.2 Cycling stability Figure 7 shows the cycle performance curve of Li-rich Mn-based materials before and after 200 charge-discharge cycles at 0.6 C and room temperature.
Online since: February 2012
Authors: Zheng Hai Zhu, Sheng Tao Qiu
., First, the thermal history of slab under different craft conditions during the process of continuous casting, conveying and heating was obtained by using mathematical simulation research[6,7], referring to the site process flow and temperature measuring data, as it is shown in Fig. 1.
However, the reduction in distribution density also indicates that precipitated particles has been dissoluble back to steel, and this phenomenon should result from simultaneous action of precipitation and ripening.
Online since: December 2022
Authors: Hanna A. Al-Kaisy, Mohanad N. Al-Shroofy, Samara Bashar
Fast deposition time, energy savings, and a significant reduction in operating costs are just a few of the reasons why ESD has gained interest over alternative powder deposition technologies [15,16,17].
In fig.2 (b) , It can be seen the positions of the peaks appearing at 2θ (37°, 43.2°, 62.8°, 75.4°, and 79.2°) can be readily indexed as (111), (200), (220), (311), and (222) crystal planes of the NiO, respectively, which is consistent with the data presented “JCPDS, No. 04-0835” [22].
Online since: February 2012
Authors: Ju Jen Liu, Lee Der Lu, Hsien Lung J Tsai, Ben Yuan Lin
Comparing data shown in Fig. 9 with that shown in Fig. 8, the region of maximum strain is the fracture region, located in the HAZ of the retreating side, with distinct local necking and reduction in size.
Online since: October 2022
Authors: Xu Xin, Ren Dong Liu, Chun Lin Li, Liang Xiao, Lin Li, Rui Kun Zhang
Introduction In order to cope with the huge pressure of energy conservation, emission reduction, environmental protection and improvement of safety performance, the development of high-strength, high plasticity and low-density automotive steel has become an urgent task faced by the steel and automotive industries.
Cook, A constitutive model and data for metals subjected to large strains, high strain rates and high temperatures, in: Proceedings 7th International Symp.
Online since: April 2023
Authors: Abdelkrim Hazzab, Hammadi Larbi, Souad Hassene Daouadji
Highly porous bodies formed by a flocculated slip will typically shrink unevenly during drying and sintering, which results in cracking and resistance reduction [6].
Impact of Xanthan Gum on the Rheological Characteristics of the Slip of Ceramic The variation of the shear stress τ as a function of the shear rate ̇ γ at different concentration of xanthan gum from 0 to 0.4 % added in slip of ceramic clearly a Non-Newtonian behavior (Fig.3) Experimental data were fitted to modified Cross model (Eq.2) developed by Grassi et al [20] τ=τ0+η∞γ+η0-η∞γ 1+(λc γ)m (2) Where τ0 is the yield stress, η0 is the zero shear rate viscosity (lower Newtonian plateau), η∞ is the infinite shear rate viscosity (upper Newtonian plateau), λc is a characteristic time and m is a dimensionless exponent.
Online since: October 2023
Authors: Akula Prakash, Sai Krishna Munipally, S. Kapilan
Setting time and compressive strength data reveal that 37.5% sodium silicate added as a cement substitute improves characteristics.
Rapid hardening concrete exhibits less shrinkage, resulting in a significant reduction in shrinkage cracks.
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