Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

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.
Online since: October 2014
Authors: Robert Černý, Milena Pavlíková, Zbyšek Pavlík, Jaromír Žumár, Jan Fořt
One can assume the differences in mineralogy of gel binding the particular silica grains.
The total number of applied cycles was 70.
The sorptivity increased with an increasing number of freezing-thawing cycles, due to the disruptive effect of frost action.Typically, the highest values of sorptivity exhibited sandstone SP, and the slowest transport of liquid water was found for material SL.
The effect of climatic exposure on sorptivity Number of freezing-thawing cycles Ref 14 28 48 56 70 Sandstone S [10-3m/s1/2] SB 0.0747 0.1002 0.1091 0.1165 0.1546 0.1876 SP 0.0787 0.1035 0.1101 0.1138 0.1889 0.1907 SL 0.0632 0.0624 0.0622 0.1036 0.1233 0.1677 Sorption and desorption isotherms are presented in Fig. 2.
The obtained data are in good agreement with the porosity measurement; they demonstrate well the changes in the porous space of researched materials with respect to the number of applied freezing-thawing cycles.
Online since: February 2026
Authors: Kateryna Iefimova, Oleksandr Khrashchevskyi, Alex Golubenko, Anatoly Sameliuk, Mykola Iefimov
Most discovered quasicrystals were produced by rapid crystallization and turned out to be metastable, but there exist a number of stable quasicrystalline phases (in systems Al-Cu-Fe, Al-Pd-Mn, Al-Cu-Co, Al-Co-Ni and others) that are present in the equilibrium diagram and can be obtained by relatively slow cooling from the melt [2, 3].
In SEM images in back-scattered electron (ВЕІ mode, Figs 2 c, e) zones of the λ-phase, which has the highest aluminum content (the element with the smallest atomic number in the alloy) and the lowest copper content (which has the largest atomic number) look dark gray, zones of the y-phase are gray, and zones of the b-phase are light.
The β-phase appears as layers surrounding ψ-phase grains (Fig. 2 с, е).
This is due to a significant reduction in the number of interphase boundaries.
Online since: November 2011
Authors: Ming Yan Zhang, Guan Hui Wang, Yi Wang, Peng Yu
Silicone PSAs, solid content: 60%; nano-SiO2, average grain diameter: 30nm; ano-Al2O3, average diameter: 30nm; siliane coupling agent, A151.
In this study, the tack of PSAs was tested using the method of oblique plane by rolling boll, and the number in TableⅠ means the size of boll, that is, the bigger size is, the better tack PSAs has.
Tack of nano-modified PSA Nano powder content (wt %) 0 0.5 2.5 4.5 Nano-SiO2 modified PSAs (number) 14.5 14 11 8 Nano-Al2O3 modified PSAs (number) 14.5 14 10 7 2.
In the range from T5 to T20, weight loss is mainly due to the fracture of side chains and the degradation of molecules chains, the number of crosslinks was increased with the growing of content of nano-SiO2, so the system of bonding force also increased, thus the thermostablility of nanocomposite enhanced, and then the T10 and T20 grow with the increasing of nano-SiO2.
Online since: September 2019
Authors: Sergey Vladimirovich Ryaboshuk, Vitaliy Kulikov, Valentin Petrovich Karasev, Pavel Valer'evich Kovalev
For example, a number of steel grades are required to have a phosphorus content below 0.015%.
For a number of alloys with molybdenum, it is possible to significantly accelerate the oxidation process due to the formation of a low-melting oxide MoO3.
At 1250oС the number of defects in the form of bubbles, cracks in the scale layer, partial delaminations from the surface of iron increases significantly, the oxidation rate of the metal also increases.
In this case, the oxide is wedged into the metal on the side of the outer layer and surrounds the grain with a continuous layer, and is also released in the form of small coalesced particles [11].
The number of liquid iron oxides formed during the melting of the mixture can be regulated by the surface area of the charged mixture and the chemical composition of the scrap. including by applying the powder components to the surface of the loaded scrap.
Online since: October 2012
Authors: Feng Cai
This disaster will bring huge economic loss and even kill large number of people and destroy the whole mine.
And the most serious country is China, in this country, all parameters of coal-gas outburst, such as total number and average strength, are the most serious, and the total number of China is approximately one-third of the world [5-7].
Due to high rigidity, close-grained, and low permeability, inner gas is difficult to emit out before the crack of hard coal, and this result to high gas pressure.
But the break of hard coal generates large number of paths and let inner high pressure run out.
Online since: January 2022
Authors: Hala Al-Jawhari, Asmaa Mudhaffar
DUV ozone treatment, where two wavelengths of 185 nm and 254 nm are employed, is an effective technique that could concurrently decrease the amount of defect sites related to oxygen vacancies and increase the number of metal oxide (M–O) bonds [16].
While the surface of STO thin films that have been subjected to the UV-photoactivation or conventional annealing at 300oC have the shape of hills and valleys, with bigger grains as illustrated in Fig.1 (e) and (f), respectively.
However, DUV photoactivation reduced the numbers of defect sites down to 25%.
Oluwabi et.al. [16] reported that DUV activation enhances the quality of their ZrO films by increasing the number of M–O bonds and decreasing the number of oxygen vacancies.
Online since: November 2018
Authors: Sufizar Ahmad, Hariati Taib, M. Azham Azmi, Shahruddin Mahzan, Rizamarhaiza Muda, Hatem Mostafa Elwalwal
The diffraction peaks found at 37.34˚, 43.38˚and 63.02˚ (2θ) can be indexed according to the JCPDS number (01-073-1519) of cubic NiO structures.
In addition, the agglomeration of silica particles increases due to the reduction in pore size and the decreasing number of pores.
This is well supported by the morphology of sintered forms as shown in Figure 4 where a higher number of open pores were observed at lower temperature.
As the sintering temperature increases, the number of open pores decreases thereby leading to a decrease in porosity.
Jung, Effect Of Sintering Temperature On Nanostructure And Grain Boundary Diffusion Of Plasma Sprayable Calcined Nio-8ysz Cermet Particles, Dig.
Showing 24351 to 24360 of 28673 items