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Online since: May 2007
Authors: Jennifer Jackman, Nai Yi Li, Joseph A. Carpenter, Philip S. Sklad, Richard J. Osborne, Bob R. Powell
There is a clear indication of grain growth at 450°C [23].
Sinclair at University of British Columbia are studying grain refinement in AZ80 by cold rolling and annealing, with multiple deformation/recrystallization treatments and cross-rolling.
The objective is to reduce the grain size of as-cast material to less than five microns to improve ductility.
Jonas and colleagues at the University of McGill are studying twinning behavior, the temperature dependence of slip systems, fracture, textures and the mechanical behavior of fine-grained extrusions [24].
However, use of wrought Mg is limited by cost due in part to the large number of processing steps required to produce magnesium sheet.
Online since: December 2012
Authors: Zhao Zheng Song, Qing Zhe Jiang, Yan Ming Xu, Wen Ju Xin, Dong Rui He, Qian Qian Song
Energy consumption in a large number of high-energy consuming industries, such as Steel industry, building materials, chemical industries, etc. in China [5], turns out to be major sources of CO2 emission in the atmosphere.
It is predicted that in 2020 the total amount of bio-energy raw materials will reach up to about 2.1 billion tons (equivalent to coal formation about 1.5 billion tons), showing a huge number of biomass energy resources in China with a broad space for development.
It is predicted that the total number of our national bio-energy raw materials in 2020 will be about 2.1 billion tons that is equivalent to about 1.5 billion tons of coal.
Now, policies of developing non-grain materials to produce ethanol are encouraged, such as the biofuel production technology of taking straw, wood, grass and other agricultural and forestry wastes as the raw materials rather than food.
What’s more, biodiesel does not contain aromatic alkanes polluting environment with lower damage to the human’s body than diesel and has high cetane number and excellent combustion properties.
Online since: January 2015
Authors: Milena Zolotareva
Petersburg as of 1820-s represent a search for the balance between an increase in the number of facilities managed by the city and the opportunity to grow the city budget by partially delegating the state functions to the city society on taxes for accumulating the funds, needed to maintain the property.
The work was carried out by a number of commissions and committees, organized to help the Ministry for internal Affairs.
The number of tax payers increases, as the owners of summer residences and territories near the city now belong to this group.
In 1840s the following loans were available: redesign of the City Duma building, reconstruction of storage facilities (used for multiple purposes), construction of military barracks and a grain pier, works on the banks of Neva and Obvodnyi canal, layout of streets etc.
Summary The increase in the number the real estate facilities belonging to the city, works on provision of urban amenities and facility maintenance became possible, because the revenues received by the city represented on forth of all city revenues in the country.
Online since: June 2022
Authors: Hans Aoyang Zhou, Florian Brillowski, Christoph Greb, Daniel Lütticke
With n describing the number of data points and y, y and y are the real, mean and predicted fiber orientation.
All models are trained with the following hyperparameters: momentum 0.99, batch size 32, and the number of epochs 200.
ResNet-18 has shown high performance with a moderate number of weight parameters and is thus efficient for training on small datasets.
Vedaldi, Fine-Grained Visual Classification of Aircraft, 2013
Zisserman, Automated Flower Classification over a Large Number of Classes, in: 2008 Sixth Indian Conference on Computer Vision, Graphics & Image Processing, 2008, pp. 722–729
Online since: November 2022
Authors: Toshio Haga
It is presumed that the semisolid metal with a low solid fraction increased the number of globular crystals.
The dendrites shown by arrows A separated from the solidification layer as the grain boundaries were re-melted by the latent heat released from the semisolid metal at the center.
The thickness of the zone of globular crystals indicated by arrow Z decreased and the number of the fine globular crystal decreased as the pouring temperature of the molten metal decreased.
If this is true, the quantity of globular crystals increases when a semisolid slurry or low-temperature molten metal is poured, as the quantity of re-melted globular crystals formed on the roll at the tip of the back dam plate decreases and the number of newly formed crystals increases.
The number of dividing dendrites in Fig. 3(b) is fewer than that in Fig. 3(a).
Online since: January 2010
Authors: Wen Sheng Zhang, Hong Fu Chen, Ming Sheng Wang
In 2008, the reduction of rice in the world's major grain-producing countries led to sharp drop in their exports of agricultural products, which resulted in skyrocketing food prices, violence and even bloodshed in some areas of food-importing countries.
The forecast model of agricultural and livestock products price In fact, a phenomenon is often associated with a number of factors, and it is more effective and realistic to predict or estimate a common dependent variable by a number of the optimal combination of independent variables rather than just one variable.
A number of these factors are used as explanatory variables, and forecasted prices will be interpreted as variables, price forecasts multivariate linear regression equation is constructed. 1121 ii YQQX QX = +++ A
A number of these factors are used as explanatory variables, and forecasted prices will be interpreted as variables, price forecast multivariate linear regression equation is constructed. 2121 ij j YPPX PX + = +++ A
Online since: May 2020
Authors: V.V. Kerimova, Lyudmila V. Klimova, Anna V. Ryabova
Evaluation of spreading frits Composition number The set of frit [mm] 1 43,5 2 26,3 3 23,1 4 26,3 5 frit melted, but did not spread 6 frit melted, but did not spread 7 23,1 8 26,3 9 43,5 10 43,5 11 38,3 12 38,1 13 26,3 14 23,1 15 26,3 As a result of the study, it has been established that the compositions of glass enamel №. 1, 9-12 have spreadability that meets the requirements.
Glass-enamel coatings № 10,11 with a high content of alkaline oxides (more than 18%) are characterized by the presence of a large number of defects of the enamel layer in the form of burn-out.
Parameters of synthesized glass-enamel coatings of series B composition number composition №1 [mass persent] composition №12 [mass persent] composition number Chemical resistance class adherence strength class 1б 95 5 1b АА 4 2б 90 10 2b АА 4 3б 85 15 3b АА 3 4б 80 20 4b АА 1 5б 75 25 5b А 1 6б 70 30 6b А 1 7б 65 35 7b В 1 8б 60 40 8b В 2 9б 55 45 9b В 2 10б 50 50 10b В 3 The resulting enamel coatings were tested for chemical resistance and adhesion strength.
Thus, the structure of the coating is homogeneous, which indicates the completeness of the processes of interaction between the grains of frit compounds № 11 and 12.
Online since: September 2013
Authors: Zhi Dong Guo, Shi Long Liu, Zi You Wu
Table 2 The requirements of crushed-stone, crushed-cobble and shingle Item Technical requirements Measured values Conclusion Grade Ⅲ Crushed-stone index (%) <20 12 Eligibility Crushed shingle index (%) <16 10 Needle plate grain content (quality %) <20 8 Mud content (quality %) <1.5 0.5 Clod content (quality %) <0.5 0.2 Fine aggregate Slow-down dome of Shangshui-Quan Road using sand demand hard, clean, even particle size.
We use level gauge detect the top elevation for the Shangshui-Quan Road one hundred and eight square meter Slow-down dome facilities about twenty-two, we get the detection data shown in Table 7: Table 7 The top elevation the actual measurement data of Slow-down dome of Shangshui-Quan Road Serial number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Measured values(mm) 40 41 42 39 42 44 41 38 42 43 40 44 42 39 38 Serial number 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Measured values(mm) 40 39 41 40 42 43 41 40 39 41 40 42 41 40 39 Design exposed height(mm) 40 Allowable deviation(mm) ±2 Average value xave. 40.8 Quadratic deviation Sx 1.612 Variation coefficient Cv 3.95% From the table we can see that Slow-down dome top elevation is within the scope of license, variation coefficient Cv =3.95 %< 10%, percent of pass =28/30=93.3%, indicating that the top elevation index is stable, effect is good.
We make use of the theodolites to detect axis deviation of Slow-down dome facilities, so get the actual measurement data shown in Table 8: Table 8 The axis based-error the actual measurement date of Slow-down dome facilities of ShangShui-Quan Road serial number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Measured values(mm) 17 15 18 12 10 17 13 16 14 17 15 16 11 12 17 serial number 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Measured values(mm) 16 13 12 13 16 17 14 15 15 21 13 14 16 15 14 Allowable deviation(mm) 20 Average value xave. 14.80 Quadratic deviation Sx 2.33 Coefficient of Variation Cv 15.74% From the table we can see that Slow-down dome axis based-error is within the scope of license, variation coefficient Cv =15.74 %< 20%, percent of pass =29/30=96.7%, indicating that the axis based-error index is stable, effect is good.
Online since: October 2010
Authors: Song Qing Zhu, Fei Hao, Jin Fei Shi
Asphalt Rutting tests of specimens of prescribed temperature and load conditions, the measured round-trip walk test wheel ruts formed by deformation rate, which each produced by deformation stability during walking 1mm deformation, said the number of the dynamic stability.
The experimental basis for the "Highway of asphalt and asphalt testing procedures" (JTJ052-2000) request that the mixture formed is 300mm × 300mm × 63.5mm of plate specimens, at the same track at 60 ℃ to wheel pressure rotation of solid rubber to 0.7MPa repeated some time rolling, forming car tank, to Rut depth (total deformation) RD and dynamic stability DS (each 1mm Rut produce the required number of RCC) as a mixture rutting resistance evaluation index.
Water Stability Test of Asphalt Mixture.Water stability of asphalt mixture, asphalt pavement that is resistant to water erosion has the effect of asphalt stripping, off grain, loose, pits and destruction.
Vacuum Freeze-Thaw Cycle Split Saturated Strength Test The trial by the Marshall compaction method forming the cylinder specimens, the number of the pros and cons of compaction of 50 times.
Maximum load(N) Splitting strength(MPa) The average (MPa) Freeze-thaw splitting intensity ratio (%) conventional Non-freeze-thaw 1 10020 0.62 0.65 83.1 2 11410 0.71 3 10820 0.67 4 9610 0.60 Freeze-thaw 1 8830 0.55 0.54 2 8400 0.52 3 8260 0.51 4 9630 0.58 Microwave Non-freeze-thaw 1 13760 0.86 0.89 83.6 2 15060 0.94 3 15720 0.98 4 12330 0.77 Freeze-thaw 1 10740 0.67 0.74 2 13320 0.83 3 11210 0.70 4 12280 0.76 The results showed that the microwave heating on the table recycled asphalt mixture freeze-thaw splitting strength higher than conventional heating methods to a number of comprehensive Tab.3 and Tab.4 shows that regeneration by microwave heating than conventional heating methods on asphalt mixture improve the stability of water, and this is mainly because microwave heating is the overall heating effect in the microwave under the asphalt mixture of polar molecules rapidly rotating, rubbing against each other to generate heat, thus improving the asphalt and aggregate between adhesion
Online since: August 2013
Authors: Mazhyn Skakov, Bauyrzhan Rakhadilov, Gaukhar Karipbayeva, Merey Rakhadilov, Michael Sсheffler
The relative wear resistance of steel determined by the formula: , where gt, gr – value of the mass loss of test samples and reference samples of test material, g; ρt, ρr - density of the reference and the test material, g/cm2, Nt, and Nr - the number of revolutions of the reference roller during testing and study materials.
After nitriding there are structural changes in the steel R6M5 surface, reduce the number of carbide particles. 25 µm b) a) 50 µm Fig. 2.
It is visible, that in the initial state in the structure of steel there are two carbide types: very bright colored carbides containing higher-atomic-number elements and grey carbide containing lower-atomic-number element.
Under a light layer is observed fine-grained transitional structure, which is a nitrogen martensite with carbide and diameter nitrided inclusions.
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