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Online since: November 2012
Authors: Yong Pan, Kai Hua Liu, Yi Gao, Rui Zhao
Some Test Results Layers of cement wall 1 layer(20-40cm) 2 layers(40-80cm) Whether can penetrate Yes No Outdoor open distance(m) 10 40 60 80 120 150 180 200 Read and write frequency (times/min) 60 60 60 60 60 60 60 60 The average number of correct times (times/min) 60 60 60 60 60 59 15 2 Accuracy rate (%) 100 100 100 100 100 98.3 25 3.3 Indoor unrestricted linear distance(m) 10 20 40 60 80 120 150 200 Read and write frequency (times/min) 60 60 60 60 60 60 60 60 The average number of correct times(times/min) 60 60 60 58 3 0 0 0 Accuracy rate (%) 100 100 100 96.7 5 0 0 0 Indoor unrestricted linear distance + Bend forward distance (m) 5 +1 5 +2 5 +5 10 +1 10 +2 10 +5 15 +1 15 +2 Read and write frequency (times/min) 60 60 60 60 60 60 60 60 The average number of correct times (times/min) 60 58 0 57 0 0 0 0 Accuracy rate (%) 100 96.7 0 95 0 0 0 0 Then we do the bending communication test based on the line communication test.
A large number of practical tests show that the typical indoor linear read and write distance of this system is 60m and the outdoor open distance up to 150 m.
[6] Shulian Yang, Jin Shen, Zhenmei Li, ‘Temperature and humidity measurement system for grain storage based on nRF905’, Advanced Materials Research, vol. 383-390, pp.5012-5016, 2012.
Online since: October 2014
Authors: Chao Yong Deng, Xin Wang, Rui Rui Cui
The subscripts m is the number of the oxygen octahedron, and the m-1 is the number of the pseudo-perovskite units [10].
These results further prove that the dysprosium ions in the CaBi4Ti4O15 do not form the second phases or segregate from the interior grain but dissolve into the CaBi4Ti4O15 host lattice [16].
In oxide phosphors, Rc can be obtained as follow equation [20]: (1) Here V is the volume of the unit cell, Xc is the critical concentration, n is the number of lattice sites in the unit cell that can be occupied by activator ions.
Presume that the activator Dy is introduced totally on Ca ion sites, so the number N of Ca site in the unit cell is 1×4=4.
Online since: June 2018
Authors: Grigory Ivanovich Yakovlev, Anastasiya Fedorovna Gordina, Valery Grakhov, Irina Sergeevna Polyanskikh, Zarina Saidova, Tatyana Plekhanova, Аleksandr F. Buryanov
The packing density of the whole composition is in direct relation with their number and ratio [4].
The growing number of scientific papers dealing with carbon nano-additives is being published nowadays all around the world, confirming its positive effect on the operational properties of construction materials.
The growing number of structural particles with high surface energy makes the whole system thermodynamically unstable.
Based on the data mentioned above, the number of carbon nanotubes in a cubic meter of cement composite is NMWCNT=7x1018, according to the Eq.6: NMWCNT=mCNTm1
Formation of the boundary layer in mineral binder-based materials modified with multilayered carbon nanotubes Graphistrenght TM: (a) - fine-grained concrete, (b) - natural anhydrite The characteristics of these hydration products are as follows: Average length lhsc=7,5×10-6 m; Calcium hydrosilicates diameter dhsc =5×10-6 m; Density of hydration products ρhsc=2400 kgm3.
Online since: November 2012
Authors: Antonio Isalgue, Francisco C. Lovey, Carlota Auguet, Guillem Carreras, Vicenç Torra
For instance, to interactions of the transformation with dislocations, precipitates and grain boundaries.
Probably, it’s the action of a progressive increase of the number of martensite domains against the deformation rate.
The increase of the active domains of transformations, passing from 1 to N, supposes that the local temperature for each front is divided by the number of domains (1 to N).
Fatigue life against the number of working cycles The Fig. 6 shows several tests of fatigue life obtained in “pure” traction with “as furnished” NiTi wire (diameter of 2.46 mm) at 293 K.
Part of the experimental results was obtained with the support of grants (to VT) of MICINN ref. number PR2008-0235 (March-June of 2009) and the support of AGAUR – Catalonia by the grant: BE-1-DGR-2009-00480 (September-October of 2010).
Online since: July 2013
Authors: Shinzo Yoshikado, Yuta Uemichi, Yuuki Sato, Kazuo Yuuki
Relationships between film thickness and (a) gas flow rate, (b) scan speed, and (c) number of scans.
The film thickness increases in direct proportion with the number of scans.
Fig. 4(c) shows the thicknesses of films obtained using a carrier gas flow rate of 6 L/min and a fixed total deposition time (the ratio of number of scans to the scan speed was fixed at 0.2 s/μm).
This result implies that the interfacial impedance between adjacent TiO2 grains in a film enhances the dielectric nature at low frequencies.
The film thickness increased in proportion with number of scans and the carrier gas flow rate.
Online since: April 2014
Authors: Qing Wei Jiang, Zheng Li, Feng Yi, Xiao Lan Cai, Lei Zhou, Ming Jun Yu
Grain growth and recrystallization of nanocrystalline Al3Ti prepared by mechanical alloying[J].
The strain can produced a large number of defects; these defects are very easy to induce micro cracks, powder become more brittle.
After milling 3h, The peaks of Ti and Al all disappeared and peaks of Ti were obviously widen, disordered fcc Ti (Al) solid solution were prepared, only (200) and (111) diffraction peak of Al existed, TiAl, Ti3Al, Al3Ti were found .With prolong the milling time to 5h, Ti and Al single peak was completely disappeared, and a large number of TiAl, Ti3Al, Al3Ti intermetallic compound were emerged.
With prolong the milling time to 5h, Ti and Al single peak was completely disappeared, a large number of TiAl, Ti3Al, Al3Ti intermetallic compound were emerged .After milling 9 hours, Ti - 48 at % Al amorphous were produced.
This work was supported by the national natural science foundation of china [grant number 51201077].
Online since: December 2014
Authors: Galina G. Kashevarova, Yuri E. Kurbatov, Roman V. Sevastyanov
So, the problem of determining the fatigue durability of concrete can be reduced to the determination of the number of cycles which are applied until the moment of complete destruction the cement components of concrete.
The grains of aggregate, having the form of a cylinder, and the cement stone were simulated in accordance with [7] by layer extrusion of flat shapes (fig. 2).
The total number of finite elements after dividing was 52682, of which 42188 were components of the cement stone.
The values of fatigue life for the calculation model Load The number of cycles before destruction N Normalized dimensionless values Natural values [Pa] 0,1 4 903 350 29 622 300 0,5 24 516 750 7 041 450 0,9 44 130 150 114 800 Figure 5.
The kinetic of damage accumulation for one of the “cube” outer planes The number of cycles 0 3 520 725 7 041 450 CONCLUSION Based on the techniques developed in this work and confirmed by a series of computational experiments, we can formulate the algorithm a fatigue study of building structures using mathematical and physical modeling. 1.
Online since: November 2013
Authors: Eva Tillová, Lenka Hurtalová, Mária Chalupová
Fatigue lifetime is measured by a number of cycles that the material can withstand before fatigue damage occurs [3].
The nominal stresses are lower than the yield strength by fatigue process and the development of the fatigue cracks demands a number of cycles to be initiated [4].
The experimental material was not modified or grain refined.
Therefore the number of cycles 107 was taken as the infinite fatigue lifetime.
The relationship between the maximum stress level, S, and the life in the form of the number of fatigue cycles Nf, (S-Nf curves) is given in Fig. 2.
Online since: June 2017
Authors: M.A. Gavrilov, O.V. Tarakanov
Introduction Buildings and structures are often susceptible to a number of aggressive environmental and industrial factors, such as chemical corrosion.
The numbers 1, 2, 3 and 4 represent mixtures with different degrees of filling, “polymer-to-filler” (designated further as P/F) ratio: for mixture 1 P/F is 1/1, for mixture 2 P/F is 1/5, for mixture 3 P/F is 1/10, for mixture 4 P/F is 1/15.
With further increase of P/F ratio an increasing number of active centers of polymerization appears, thus resulting in a more gradual nature of plastograms and increasing the viscosity of the mixtures.
Such methods during the process of material manufacturing allow to fill the voids between the grains of the filler and the outer surface of the filling material with chemically resistant binder.
An increase in the number of contact points due to a close encounter of the molecules of the binder and filler is also notable.
Online since: May 2021
Authors: C. Thirupathaiah, Sanjeev Reddy K. Hudgikar
Sample number 1: 100% of Al 6063 Sample number 2: 97% of Al 6063+1% of B4C+1% of SiC+1% of Fly-ash Sample number 3: 95% of Al 6063+2% of B4C +2% of SiC+1% of Fly-ash Sample number 4: 94% of Al 6063+2% of B4C +2% of SiC+2% of Fly-ash Fig. 1.
Table and graph shows the improvement of mechanical property by adding the reinforcement of composite material Al6063, In microstructure structure silicon carbide, boron carbibe and fly ash particles are shows the fine distribution of grains which is shown in Fig.2.
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