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Online since: August 2014
Authors: Lubomír Pepucha, Juraj Šrámek, Katarína Zgútová, Dominika Ďureková, Peter Danišovič
The first three numbers figure the value of compaction CIV (Clegg Impact Value).
Letters IV mean the value of compaction; the last number is the number of the falls of the mass from the start.
Slovak Republic (2010), BTO print, p. 487 [8] Information on http://www.keison.co.uk/sdinstrumentation_cist882.shtml [9] Slovak Office of Standards SUTN: Laboratory determination of the strength of fine-grained in simple compression.
Online since: November 2013
Authors: Mohamad Rusop, Saifollah Abdullah, A.Z. Zainurul, C.H. Rosmani, Mohd Nor Asiah, Mohd Husairi Fadzilah Suhaimi
The grain structure of film can be seen clearly from this AFM image.
The efficiency of emission peaks depends on the number of electrons in the 4f shell.
It efficiency of LaPO4 films also depends on the number of electron in the 4f shell.
When the number of multi layer increase, more LaPO4 nanostructures were induce boosting the capability of multilayer to absorb photons and reradiates back the photons.
Online since: August 2014
Authors: Qin Lan Zhang, Xiang Liu, Zhi Yong Lu
Abrasive in lubricating oil is the important information carrier of wear state, which directly reflects the number of material losses of the friction pair and the form of wear.
The number of particles in the oil sample can be measured by measuring the induced voltage in the coil [6].
Each oil sample will be measured 10 times, then calculate the average of the 10 measurements, which is the number of abrasive in the oil sample.
The influencing factors analysis of the magnetic texture of multi-component granular materials If the proportion of Ni and Fe is 1:3, under the condition of non-magnetization, the fitting curve of the PQ and the weight of grains is shown in Fig.6, with a slope of 507 755 (PQ / mg).
Online since: March 2016
Authors: Shu Zhen Yu, Yue Cheng, Li Ping Xu, Xiao Feng Fan
Weigh 0.05g nZVI to five small jars of 250mL glass reactor (numbered 1,2,3,4, and 5) in different concentrations (0.1mg / L, 0.2mg / L, 0.3 mg / L, 0.5mg / L, 1mg / L) of the chloroform solution and placed in water bath at 25oC oscillator reaction conditions, and measuring the reaction concentrations of chloroform in certain time Results and Discussion XRD and TEM analysis.
XRD results showed that the scanning diffraction angles (2θ) at 5~70°, present nZVI diffraction peaks at 2θ = 44.8 and 65.06°, corresponding to the standard body-centered cubic lattice iron diffraction peak [8-9]; grain’s thinning caused a certain width of diffraction peaks, but un-crystalline state’s broadening peak, which indicated that it was small size microlite, the broaden of diffraction peak broadening is related to the size of the microlite[10].
Table 1 Reaction kinetics and parameters of chloroform dechlorination under different initial chloroform concentration Reactor number Initial concentration of chloroform (μg/L) Kinetic equations The correlation coefficient R2 The apparent reaction rate constant K (h-1) A 100 R2=-0.1488x-1.3799 0.9581 0.1488 B 200 R2=-0.0478x-1.3039 0.6342 0.0478 C 300 R2=-0.0419x-1.0347 0.5712 0.0419 D 500 R2=-0.0306x-0.8715 0.7111 0.0306 E 1000 R2=-0.0250x-0.7982 0.6197 0.0250 Proposed chloroform dechlorination reactions mechanism.
The surface of the coatings began to dissolve after a certain time, and as a result, nZVI began to expose slowly and reacted with oxygen in the solution as follows[12]: Coated +Fe0→coated +nZVI (release) (1) 2Fe0 +4H++ O2→2Fe2+ +2H2O(acidic solution) (2) Fe0 +2H2O →Fe2++ H2 +2OH- (3) Since nZVI has large surface area and can strongly absorb chloroform, the other part of nZVI may absorb alarge number of chloroform on the surface of nZVI.
Online since: April 2021
Authors: Marina V. Potapova, A.M. Stolyarov, Ye.A. Buneyeva
Introduction In the oxygen-converter shop of PAO «Magnitogorskiy metallurgicheskiy kombinat» the tube steel is cast on a slab curvilinear CCM with a vertical section of the company "SMS-Demag" having the following technical characteristics: Type of CCMCurvilinear with vertical section Number of strands, pcs. 1 Annual project productivity, million tons of slabs 1.65 Dimensions of cast slabs (mm): thickness 190, 250, 300 width 1400 ... 2700 length 4100 ... 12000 or 2500 ... 4100 Metallurgical length of the machine, m 34.2 Length of vertical section, m about 2.7 The main radius of curvature of the machine, m 11 Max withdrawal speed (by mechanisms), m / min 2.5 Ladle capacity, t 370 Capacity of intermediate ladle, t 50 Height of copper walls of crystallizer, mm 900 Oscillation frequency of the crystallizer, osc / min up to 300 Amplitude of crystallizer oscillation, mm up to 3.5 Number of segments in the ZVO, pcs. 15 Mark of pouring platform, m about 13.8
Scheme of the service channel of a single-slab CCM: 1 ... 15 - segment numbers; I - vertical section; II - section of the bend; III - arc section; IV - section of extension; V - horizontal section The secondary cooling zone has 15 segments.
The formation of asymmetry occurs as a result of the settling of large equiaxed grains formed in the curved well of a liquid metal by a volume mechanism to the boundary of the lower freeze line.
Online since: January 2016
Authors: Sufizar Ahmad, Rosdi Ibrahim, Nur Suliani Abdul Manaf
The foam replication method has a number of advantages over other fabrication methods, such as the ability to produce foams with a highly porous structure with adjustable pore dimensions.
The wrought CoCrMo alloys exhibit superior mechanical and chemical properties compared with the cast alloys due to a finer grain size and more homogenous microstructure [6].
The number of closed pore in the CoCrMo foam produced were decreased with the increasing of CoCrMo composition [8].
In order to have similar microstructure as natural bone, the number of closed pore should be minimized.
Online since: February 2012
Authors: Pei Feng Zhao, Zhan Hong Ma
Table 1 Experiment scheme Sample number A1 A2 A3 B1 B2 B3 B4 Silica Sol : dextrin 1:1 2:1 3:1 aluminium dihydrogen phosphate : CMC 1:1 2.5:1 4:1 5.5:1 Results and analysis Figure 1 Test result of the Bulk density Figure 2 Test result of permeability and porosity rate Figure 3 Test result of compressive strength Figure 4 Test result of thermal shock resistance A2 B1 B2 A1 Figure 5 Composite samples using different binder scanning electron micrograph Figure 1 shows the Bulk density of ceramics With different multiple binders .It can be seen from Figure 1 that with the Sol: dextrin ratio or aluminum phosphate: CMC ratio increases, the foam bulk density slightly increased, and reach peak value the Bulk densityand , then decrease with Sol: dextrin ratio or aluminum phosphate: CMC ratio increased.
Silica and dextrin ratio of 1:1, due to sintering produced a large number of cracks and crack, so the thermal shock resistance is poor; ratio of 2:1, the sintered sample and even fewer cracks, thermal shock resistance better; ratio of 3:1, the cracking more, and because adding an excessive amount of silica sol, the excess has become cristobalite SiO2 phase high-Wen Shisheng, and cristobalite in high-temperature crystalline transition occurs when a large volume change, leading to poor performance of the filter temperature.
By comparing Figure (B1) and (B2) can be seen: sample B1 (aluminum phosphate: CMC 1:1) in the glass phase are more crystalline particles larger, so the specimen compressive strength and thermal shock stability performance is poor; sample B2 (aluminum phosphate: CMC 2.5:1) in the small glass phase, crystal grains smaller, so the specimen compressive strength and good thermal shock resistance and other properties.
Conclusion In summary, according to the experiments and analysis we can draw the following conclusions: 1 using aluminum dihydrogen phosphate-CMC as a binder preparation of alumina-based ceramic foam, its overall performance is better than using the sol - dextrin as a binder prepared sample. 2. the types and proportions of composite Binder hanging pulp properties and sintering of alumina bubble ceramic appearance and density have a greater impact, has little effect on the rate of porosity and permeability. 3 When the aluminum phosphate-CMC ratio of 2.5:1, the best overall performance can be prepared by the alumina-based ceramic foam, the compressive strength of 1.697MPa, five times the number of thermal shock; for sol - dextrin, a ratio of 2:1 can be prepared the best overall performance of alumina-based ceramic foam, the compressive strength of 0.974MPa, thermal shock 4 times.
Online since: September 2008
Authors: Masakazu Katsuno, Noboru Ohtani, Takashi Aigo, Hirokatsu Yashiro, Tatsuo Fujimoto, Masashi Nakabayashi, Hiroshi Tsuge, Hosei Hirano, Kohei Tatsumi, Taizo Hoshino
A number of papers have reported on the thermoelastic stress in growing crystals using mathematical calculation methods [3, 4].
In general, SiC crystals are grown in convex thermal distribution environment toward the growth direction, and in case of larger lateral expansion, stronger convex distributions are crucial in order to maintain single polytype growth as well as to suppress disturbance of the single crystal growth, i.e. polycrystalline grain formations [9, 10].
The number of the micropipe defect is found to be 2, corresponding to a MP density of 0.025/cm2.
The number of MP defect is 2, corresponding to a density of 0.025/cm2.
Online since: November 2011
Authors: Singh Surendra, S Narayanan, Prakash Satya, G. M. Reddy, N. Arivazhagan
These numbers of dark brown colour patches were more on 4140 side than on 304 side.
With further increase in number of cycles, the whole scale turned to dark brown colour.
The plots of cumulative weight gain (mg/cm2) as a function of time (number of cycles) for electron beam weldment exposed at a temp of 800 ºC in (K2SO4-60% NaCl) up to 50 cycles are shown in Fig 3.
It should be due to changes in reaction rate which are associated with the formation of a laminated inner-oxide layer made up of fine and coarse grain spinel oxide [3, 4].
Online since: May 2012
Authors: Guo Feng, Huai Ming Ning
The actual movement of the pipe network should be subject to Keqihuofu first law (continuity equation), that the flow of any node is zero: (1) Formula for k branch flow, rn3/ s, the sign is positive according to flow into the node number, out of node negative number, ..., J-1, the first of which J has been selected as reference nodes or reference nodes in the node, N is the number of branches; as an independent loop matrix elements, when = 1, that node and the endpoint of k out of the branch node; = -1, that is k i nodes and branches out to the end node; when = 0, the i-node is not a branch of the endpoints k: Will (1) can be written in matrix form as: (2) Among them, the elements of matrix A.
[2] Liu Xiaomin.Distributed variable frequency regulating system, Grain science and technology and economy (2003)
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