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Online since: September 2018
Authors: Ryben R. Kazaryan, Vitaly A. Khvan
Due to the use of mixtures with low amount of mixing water this technology provided for:
• Reduction of pre-autoclave aging of freshly formed raw material to 1-2 hours,
• Reduction of humidity,
• Improved strength, frost resistance and durability of the products with the same density of cellular concrete,
• Increased manufacture of finished products from the volume unit of the autoclave and the production area of the shop,
In order to make products from cellular concrete binding, siliceous components and gas-forming agents are used:
binders:
• Portland cement,
• Quick calcium lime,
• Granulated blast-furnace slag,
• Ash from the burning of oil shale and some types of brown coal;
siliceous components:
• Quartz sand or silica containing waste from mining and processing industry,
• Ash from burning brown and hard coal,
gas-forming agents:
• Aluminium powder or paste, which is used with the addition of surfactants,
• Plasticizing additives, regulating the processes of gassing
A related reference data for the Russian Federation is provided in the following text [1-5].
A related reference data for the Russian Federation is provided in the following text [1-5].
Online since: October 2013
Authors: Wei Feng Liu, Shao An Cheng
These changes are expected for MFCs, since many researchers [12,13] have found that removal of surface contaminations and reduction of the oxygen group content on anode surface could facilitate the biofilm formation and electron transfer, thus improving the power production of MFCs.
When the MFCs were operated, cell voltage was recorded every 20 min using a data acquisition device (2700, Keithley Instruments, Inc., USA).
Phillips, Novel Mode of Microbial Energy Metabolism: Organic Carbon Oxidation Coupled to Dissimilatory Reduction of Iron or Manganese, Appl.
When the MFCs were operated, cell voltage was recorded every 20 min using a data acquisition device (2700, Keithley Instruments, Inc., USA).
Phillips, Novel Mode of Microbial Energy Metabolism: Organic Carbon Oxidation Coupled to Dissimilatory Reduction of Iron or Manganese, Appl.
Online since: August 2013
Authors: Shi Lin Tan, Xin Bang Ding, Xue Qin Jiang
Compared to the method of traditional mix proportion design — the simple equivalent replacement method, the method of dense aggregate packing makes the concrete structure more compact and the dosage of cement have a significant reduction.
Under the same water-binder ratio, as the FSR increases, the strength at each age has different degrees of reduction, which possibly because the activity of flyash is lower and its contribution to concrete strength is mostly from its tiny aggregate effect.
Data sheet of chloride ion penetration resistance No. electric flux(C) grade of penetration resistance 28d 56d C-12 532 286 Q-V C-11 470 248 Q-V C-21 372 205 Q-V D-12 459 236 Q-V D-11 336 175 Q-V D-21 258 171 Q-V The chloride ion penetration resistance of concrete is an important indicator to measure the durability of concrete.
Under the same water-binder ratio, as the FSR increases, the strength at each age has different degrees of reduction, which possibly because the activity of flyash is lower and its contribution to concrete strength is mostly from its tiny aggregate effect.
Data sheet of chloride ion penetration resistance No. electric flux(C) grade of penetration resistance 28d 56d C-12 532 286 Q-V C-11 470 248 Q-V C-21 372 205 Q-V D-12 459 236 Q-V D-11 336 175 Q-V D-21 258 171 Q-V The chloride ion penetration resistance of concrete is an important indicator to measure the durability of concrete.
Online since: June 2021
Authors: Gu Fan Zhao, Rui Yao Wang
With transdisciplinary application and integration, international oil companies and service companies actively draw on cutting-edge technologies like nanotechnology, functional materials, big data, and artificial intelligence to effectively promote the development of petroleum engineering development.
The new composite material is expected to be used in the underground special tools, underground antenna and other special components instead of steel, to achieve weight reduction, corrosion resistance, improve signal strength and other functions.
Adjustable working frequency (70MHz-7GHz); not easy to break, more durable (stretched 2.2 times); flexible design, reconfigurable; system weight reduction and miniaturization.
The new composite material is expected to be used in the underground special tools, underground antenna and other special components instead of steel, to achieve weight reduction, corrosion resistance, improve signal strength and other functions.
Adjustable working frequency (70MHz-7GHz); not easy to break, more durable (stretched 2.2 times); flexible design, reconfigurable; system weight reduction and miniaturization.
Online since: February 2011
Authors: Koji Kita, Atsushi Eika, Tomonori Nishimura, Kosuke Nagashio, Akira Toriumi
Thus partial reduction/oxidation, assisted with local Joule heating [2], will be responsible for the connection/disconnection of the conductive path with the application of electric biases.
The same trend was also observed by the XRD patterns of the films deposited on Pt layers (data not shown).
On the other hand if we assume that the electron injections from cathode would be enhanced by inserting a poorly-crystallized layer, then it is reasonable to consider that the injection will initiate the conductive path formation, since the reduction of oxides induces oxygen deficient type defects in the film, which might be responsible for the conductive path formation, as demonstrated clearly for TiOx stacks [7, 13].
The same trend was also observed by the XRD patterns of the films deposited on Pt layers (data not shown).
On the other hand if we assume that the electron injections from cathode would be enhanced by inserting a poorly-crystallized layer, then it is reasonable to consider that the injection will initiate the conductive path formation, since the reduction of oxides induces oxygen deficient type defects in the film, which might be responsible for the conductive path formation, as demonstrated clearly for TiOx stacks [7, 13].
Online since: July 2017
Authors: Klaus Drechsler, Christian Oblinger, André Baeten
Particularly, drive shafts comprising a CFRP structure commonly provide weight reductions of up to 50 percent compared to conventional steel shafts due to their high specific strength and stiffness [12, 13].
Moreover, the reduction of the section with a small diameter in combination with a fiber angle of ± 45° with respect to the axial direction is effective.
The material data of the epoxy-based prepreg SGL CE 8201-200-45S woven (twill 2/2) was ply-wise implemented into the finite element software.
Moreover, the reduction of the section with a small diameter in combination with a fiber angle of ± 45° with respect to the axial direction is effective.
The material data of the epoxy-based prepreg SGL CE 8201-200-45S woven (twill 2/2) was ply-wise implemented into the finite element software.
Online since: March 2007
Authors: Claudio Guarnaschelli, P. Folgarait, E. Paravicini Bagliani, R. Demarchi, H. Desimone
Usually, the reduction of area (ROA) and toughness decrease when FV,M increases.
This reduction of ROA is gradual in the range 15% < FV,M < 80% when low-C martensite islands are predominant, whereas ductility approaches quickly very low values for FV,M < 15%, when high-C poordeformable martensite is present (CM>0.4%).
Also experimental data from laboratory tests are shown.
This reduction of ROA is gradual in the range 15% < FV,M < 80% when low-C martensite islands are predominant, whereas ductility approaches quickly very low values for FV,M < 15%, when high-C poordeformable martensite is present (CM>0.4%).
Also experimental data from laboratory tests are shown.
Online since: January 2013
Authors: Hua Wang, Yong Gang Wei, Kong Zhai Li, Xing Zhu, Ya Ne Zheng
Reaction characteristics of Ce-based oxygen carrier for two-step production syngas and hydrogen through methane conversion and water splitting
Yonggang Wei1,a, Xing Zhu1,b, Kongzhai Li1,c, Yane Zheng1,d, Hua Wang1,e
1Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction Ministry of Education, Kunming University of Science and Technology, Kunming 650093, PR China; Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China
aemail:weiygcp@yahoo.com.cn, bemail:zhuxing2010@hotmail.com,cemail:lkz_514@yahoo.com.cn, demail:zhengyane87@yeah.net, eemail:wanghuaheat@hotmail.com
Keywords: Syngas; Hydrogen; Methane conversion; Water splitting; Ce-based oxygen carrier;
Abstract: The two-step steam methane reforming for production syngas and hydrogen was investigated by using Ce-based oxygen carriers (CeO2, CeO2-ZrO2,CeO2-Fe2O3) which were prepared by co-precipitation method and characterized by means of
Data was collected between 2θ = 10°−80°;The Raman spectrum of oxygen carriers were recorded in a Renishaw Invia Raman imaging microscope.
CH4-TPR and CH4-IR Methane temperature-programmed reduction (CH4-TPR) was performed on a fixed-bed reactor under a flow of 5% CH4/N2 (200 cm3/min) over 1.8 g sample using a heating rate of 10 °C/min.
Data was collected between 2θ = 10°−80°;The Raman spectrum of oxygen carriers were recorded in a Renishaw Invia Raman imaging microscope.
CH4-TPR and CH4-IR Methane temperature-programmed reduction (CH4-TPR) was performed on a fixed-bed reactor under a flow of 5% CH4/N2 (200 cm3/min) over 1.8 g sample using a heating rate of 10 °C/min.
Online since: October 2010
Authors: Hai Jiang Wu, Fei Ying Yang
The
acquired measurement data were analyzed by using the software packages of CHI750A.
Therefore the Cer+sil film obtained by the two-step pre-treating provided the strongest reduction of current density.
In anodic area, zinc has a high solubility and dissolves with formation of Zn 2+ ions, while the local pH increase at the zinc surface proximity leads to cerium hydroxide and zinc hydroxide precipitation on the zinc surface due to the oxygen reduction reaction in cathodic area.
Therefore the Cer+sil film obtained by the two-step pre-treating provided the strongest reduction of current density.
In anodic area, zinc has a high solubility and dissolves with formation of Zn 2+ ions, while the local pH increase at the zinc surface proximity leads to cerium hydroxide and zinc hydroxide precipitation on the zinc surface due to the oxygen reduction reaction in cathodic area.
Online since: August 2020
Authors: Nirun Witit-Anun, Adisorn Buranawong
The crystallinity enhancement which observed from X-ray intensity increased was came from the aggregation deposited atom resulting more order atom arrangement and the reduction of the defect during the annealing temperatures. [12]
The crystal sizes of all samples were evaluated from the XRD peaks using the Scherrer formula were found in table 2.
An almost reduction in the chromium from 20.65 to 2.68 (at.%) and a complete addition of oxygen (58.64 at.%) contents in the films at 700 °C, a significant decrease in Ti and N from 43.26 to 22.75 (at.%) and 51.19 to 15.94 (at.%), respectively, were also detected.
This experiment data are in good agreement with previous literature [16].
An almost reduction in the chromium from 20.65 to 2.68 (at.%) and a complete addition of oxygen (58.64 at.%) contents in the films at 700 °C, a significant decrease in Ti and N from 43.26 to 22.75 (at.%) and 51.19 to 15.94 (at.%), respectively, were also detected.
This experiment data are in good agreement with previous literature [16].