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Online since: August 2011
Authors: Ji Fang Xu, Gong Yuan Liu, Jie Yu Zhang, Lei Tang, Chang Jie
With the reduction of Mo content, Mo metal phase as the continuous network structure is dispersedly distributed in the ceramic phase zone.
In order to ascertain the reliability of the data, the experiments were repeated three times.
With the reduction of Mo content, Mo metal phase as the continuous network structure is dispersedly distributed in the ceramic phase zone.
Online since: September 2014
Authors: Piotr Bobrowski, Frank Czerwiński, Łukasz Rogal, Lidia Litynska-Dobrzyńska, Anna Wierzbicka-Miernik, Jan Dutkiewicz
It was found that the single-step deformation of as-cast alloy via hot rolling at 350°C with a thickness reduction of 50% refined the alloy microstructure by creating deformation bands of the Mg(α) phase with a size of the order of tenths of micrometers.
The as-cast ingot was subsequently hot rolled at 350°C with a thickness reduction of 50% using the quarto-duo DW4-L rolling mill.
(a) Plot of liquid fraction versus temperature for the Mg-3%Zn alloy, obtained from heat flow versus temperature data, recorded with DSC; (b) microstructure of the Mg-3%Zn as-cast ingot, re-heated to 630°C and quenched in water Effect of hot rolling step Plastic deformation in the solid phase is one of many methods of feedstock preparation for light alloys as well as for steels [3, 17, 19].
Online since: July 2011
Authors: Jing Bai, Feng Xue, Yang Shan Sun
The need for further weight reduction is expanding the future use of magnesium to critical components such as transmission and engine parts.
Fig. 6 shows the all experimental data logarithmically plotted as strain rate, , versus the normalized stress, (σ/G) in the creep conditions of 175 oC and the applied stress between 50-80MPa.
The plot is shown in Fig. 7 for the data with n = 3.5 taking σ = 70MPa.
Thus a reduction or elimination of the Mg17Al12 volume will lead to improvement in creep resistance.
There is a wide stress ranges at intermediate stresses and a single testing temperature where the datum points usually fall along a line having a slope within the range of ~3 to 6[11].
Online since: May 2021
Authors: S. Sidelnikov, M. Motkov, M. Voroshilova, V. Bespalov, D. Voroshilov
The results of experimental studies in comparison with the calculated data showed that the deviation of the calculated data does not exceed 15%.
Calculation data of the power parameters of the CRE process at various units.
From which it can be seen that the deviation of the calculated data does not exceed 15%.
Comparison of the calculated and experimental data of the force parameters during the combined rolling-extruding of a rod with a diameter of 5 mm on the CRE-200 unit.
Force, kN ξ, s-1 Calculated data Experimental data Deviation, % P1 0.5 221 250 11 1.5 229 270 15 P2 0.5 122 121 1 1.5 126 149 15 Conclusion Thus, the conducted analytical and experimental studies made it possible to propose new technological modes of combined rolling-extruding for the production of rods from alloy 01417 with the aim of further drawing wire for electrical purposes.
Online since: April 2005
Authors: K.V. Shaitan, Ye.V. Tourleigh
Partial reduction of the cyclophane (at an applied bias of +2 V) is necessary to regenerate [A 0] co-conformer.
Results and discussion Quantum chemical calculations have correctly reflected that catA 0 is oxidized to catB + very due to sulfur of the tetrathiafulvalene unit, as well as at the reduction catA 0 → catAB# the nitrogen of bipyridine is reduced first of all.
Taking into account the known experimental data on the energy of activation in similar catenanes (10 kcal/mol), it is possible to assume that at room temperature rotation is possible with times of about several tens of milliseconds.
It remains only to suppose that assigned distribution of charges is an essential factor in the rotation of the rings; but nevertheless, the assignment is well coordinated to known data from electrochemistry [14].
[14] http://www.sciencemag.org/feature/data/1039735.shl.
Online since: June 2011
Authors: Ahsan Ali Khan, A.K.M. Asif Iqbal
RSM is a vital tool for designing experiments and analyzing data for model prediction and selection of the best equation that represents the experimental results (Douglas, 2005; Kathleen et al, 2004).This design technique allows a process to be optimized using relatively few experiments when there are a large number of input parameters.
This reduction of MRR occurs due to the instability of spark at this stage.
The heat generated during machining at this stage was easily removed, facilitating a reduction of temperature around the surface of copper electrode.
This is due to the reduction in recast layer thickness during machining.
Online since: May 2020
Authors: Viktor Alekseevich Kukartsev, Vladislav Viktorovich Kukartsev, Vadim Sergeevich Tynchenko
Easy removal of the rod from the equipment, a significant reduction in model wear as well as a reduction in pollution and breakage of models make it possible to organize storage of core boxes and models as close as possible to the place of their use.
AlpHaset Acid-curable furan resins Phenolic acids Phenolic urethane Alkyd isocyanate Silicate ester Odor level when mixing Very low High High High Moderate Very low Extract from the form Great Weak Weak Weak/ Moderate Great Good The possibility of cleaning with water Yes Partial Partial No No Yes The ratio of working time to time of extraction 30% 30-40% 50% 25% 25% 25% Exposure to sand temperature Moderate Strong Strong Moderate Moderate Moderate Using different types of sand Yes No No No Yes No Shelf life of kernel/form Long Long Long Мedium Мedium Short The possibility of rapid solidification of the mixture Yes Yes No Yes No No The possibility of slow solidification of the mixture Yes Yes Yes No Yes Yes Regeneration capability High/ Moderate High High High High Low This study shows that AlpHaset has many advantages compared with other processes, including a high degree of the spent mixture utilization, which leads to a decrease in waste dumped and a reduction of environmental damage
Sand mark GOST 2138-91 Content of clay component, % Rests on the sieves, % Fineness modulus Uniformity coefficient, % Average grain size, mm 1,6 1,0 0,63 0,4 0,315 0,2 0,16 0,1 0,063 0,05 1K20203 up to 0,2 - 0.12 2.82 5.12 43.28 32.28 12.3 3.06 0.86 - 49 74 0.34 2K20203 up to 0,5 - 0.2 2.4 11.54 27.8 49.54 6.04 2.22 - - 48 77 0.30 1K202025 up to 0,2 - 0,12 0,17 7,74 17,3 55,92 9,76 6,44 0,54 0,32 53 73 0,27 2K202025 up to 0,5 - 0,1 1,38 7,62 18,82 56,22 9,24 5,52 0,76 0,06 46 74 0,28 1K20202 up to 0,2 - - 0.46 2.1 8.06 53.92 25.47 9.37 0.42 0.04 59 79 0.22 2K20202 up to 0,5 - - 0.46 2.07 8.99 58.98 19.04 9.60 0.40 0.06 59 75 0.23 Based on these data, it is impossible to choose sand that meets the requirements of the AlpHaset system for the content of fine dust particles ranging in size from 0 to 0.125 mm less than 2% and a residue on the grid of 0.125 mm maximum 5%.
Online since: December 2016
Authors: Ivan Chmúrny
There is much statistical data for the existing residential buildings, but the amount of information available about non-residential buildings is often very scarce.
Criteria for NZEB To achieve the NZEB parameters it is necessary to proceed from the acceptance and determination of three interrelated criteria: – Reduction of specific energy need for heating to a minimum
Reduction of primary energy consumption for heating, cooling, ventilation, domestic hot water and lighting
Supply of energy from RES found in the building or its proximity should provide at least a 50% reduction of primary energy.
Online since: June 2017
Authors: Yu Xiang Lu, Xian Ping Li
In addition, there’s a lower peak at the position of 2θ=20°, which may be due to partial reduction of graphene oxide during the drying process[19].
In the preparing process, the electrodepositing solutions of the No.4, No.9, No.10, No.11, No.15 and No.16 experimental groups are not suitable due to the unsuccessful electrodeposition, and there are no data of the microhardness values of these groups in Table 2.
Chen, et al, Stable aqueous dispersions of graphitic nanoplatelets via the reduction of exfoliated graphite oxide in the presence of poly (sodium 4-styrenesulfonate), Journal of Materials Chemistry. 16 (2006) 155-158
Piner, et al, Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide, Carbon. 45 (2007) 1558-1565
Online since: January 2018
Authors: Andrey V. Nomoev, Svetlana L. Gafner, Sergey P. Bardakhanov, Yuri Ya Gafner
An inorganic shell on a metal particle considerably improves thermal stability of a core and is reliable to protect its surface from oxidation-reduction reactions [5].
Unlike clusters in metal or organic shell, particles in a silicon shell are rather stable as silicon is chemically inert and it reliably protects the surface of the internal particle from oxidation-reduction reactions if the core is in a hermetic shell [9].
Empirical data in the course of numerous researches have shown that nanoclusters of one and the same metal may have different structure [17] and, along with this, fluctuations of different structural modifications by melting temperatures for nanoparticles of big size were observed microscopically [18].
Chen, AgAu Bimetallic Janus Nanoparticles and Their Electrocatalytic Activity for Oxygen Reduction in Alkaline Media, Langmuir 28 (2012) 17143-17152
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