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Online since: October 2009
Authors: Hisashi Sato, Yoshimi Watanabe, Shimaa El Hadad
It was reported that for CCM-FGMs, the arrangement of the platelets perpendicular to the radial direction of the ring is a good indication for the effect of centrifugal force, and this effect varies depending on the value of G number. [8,9].
Rotating axis Experimental Procedure A set of experiments was performed using CCM to produce Al/Al3Zr FGMs under 30, 60 and 120 G, where G number is the ratio of centrifugal force to that of gravity.
From Fig.2 (a), the Al3Zr particles in Al/Al3Zr FGMs fabricated under G=30 were gradually distributed from the outer to the interior of the intermetallics reach area, then very fine particles were found located on the grain boundaries in the inner regions.
Online since: May 2011
Authors: Nan Zhang, Lian Xu Shi
Soil dynamics parameters Layer number soil Soil upper bound (m) Soil layer lower (m) Proportion(KN/m3) Elastic modulus (MPa) Poisson's ratio 1 Miscellaneous fill in the soil 0 -4 17.5 98 0.444 2 Loose gravel -4 -7 20 584 0.399 3 A little secret pebble -7 -9 21 691 0.396 4 Loose gravel -9 -12 20 584 0.399 5 Medium-density gravel -12 -18 21.5 989 0.377 6 Close-grained pebble -18 -21.5 22 1356 0.366 7 Medium-density gravel -21.5 -26 21.5 989 0.377 8 Strongly weathered mudstone -26 -27 21 1042 0.379 9 Medium weathering mudstone -27 -37 23 3907 0.301 Vibration control limits Vibration control limits are ruled most strictly in Chinese Urban Region Environment Vibration Standards [6].
The numbers all above did not exceed 5mm/s2 or 2.5mm/s2 which are presented in the 4th quarter as the aerial parts peak acceleration and underground parts peak acceleration respectively.
Online since: September 2005
Authors: Marcel A.J. Somers, Karen Pantleon
The angular distribution of fibre oriented grains was characterized (for non-overlapping fibre components) by the full width at half maximum (FWHM) taken from a plot of normalized intensities as a function of the sample tilt angle ψ.
Although this results in a small total misfit of only 1.3%, the low number of atoms that actually match, i.e. one out of 49 for Au and one out of 64 for Cu, does not represent a reasonable coincidence of the two lattices.
Within the interface the ratio of the number of coinciding Cu- and Au-atoms is 4:3.
Online since: June 2011
Authors: Yuan Wang, Ya Ping Mo, Jian Jun Fan
Much more micro-sized grains are also observed and some of them adhere to the surface of coarse-sized particles.
A total of 10 pellets are measured and the mean drop number at which the pellet break down is measured in times/0.5m for an individual pellet.
The main reasons for this phenomenon is that with the increasing number of micro-sized particles after the iron concentrate being ground, the capillary will become even narrower among the material particles and capillary attraction will become even stronger.
Online since: June 2006
Authors: Danuta Kotnarowska
Apparatus for testing erosive wear of organic coatings: 1 - container for erosive material; 2 - pipe transporting erosive material; 3 - optical microscope; 4 - rotational holder for fixing metallic test specimen with organic coating; 5 - container collecting erosive material after the test Particles of granulated alundum (aloxite) of grain size 0.60...0.71 mm (acc. to PN-76/M-59111) were used as the abrasive material.
Factors contributing to the increase of erosive wear intensity are as follows: increase of epoxy material brittleness, increase of surface layer roughness and generation of different kinds of cracks, and silver crazes in this number.
This is testified by the increase of carbonyl group's content (in the wave number range of 1766-1721 cm-1) evaluated on the ground of spectroscopic examination in infrared radiation (FTIR).
Online since: October 2014
Authors: Marian Gheorghe, Patrice Plassais, Andreea Mădălina Ene Căscătău
R (LD) = (LDmax - LDmin)/ dn (4) where LDmin and LDmax are the minimum and maximum measured values of LD within a group of repeated experience(s), and dn - a factor depending of experience(s) number of repetitions.
Experiment structure and process parameters Experience no. g [mm] F [N] τ [s] Voltage [V] / Intensity [A] Wire speed [m/min] Welding speed [m/min] Total process time, T0 [s] Number of repetitions 1 0 F0; 0 0 267 / 25.1 8.5 0.72 360 3 2 0 60 3 1.6 0 4 1.6 60 Practically, f, w, c, m processes, as well the manufacturing system (Fig. 3) were in three successive active main phases (see Fig. 2): f-w-c-m, during TW period of time; f-c-m, after weld completion, during τ period of time; nf-c-m, after τ time completion, until the end of T0 time.
[9] ***, NF EN ISO 14341, Wire electrode and weld deposits for gas shielded arc welding of non alloy and fine grain steels, April 2011
Online since: February 2012
Authors: Xin Qiang Ma, Dan Ning Li, Qi Li
For example, present implementations comprise a large number of security classes (SC).
Virtual Private Database (VPD) VPD supports fine-grained access control to data rows.
In most applications, a relatively small number of application tables will require label-based access controls.
Online since: June 2014
Authors: Yan Qing Nie, Meng Lu
The number of special vehicle for bulk grain is too small and it can not meet the requirements of food “scattered”.
Enhancement of infrastructure capacity Qinhuangdao Port is the largest coal shipping port, in addition to a large number of transportation energy consumption, coal itself has a lot of dust hazards to air.
Online since: September 2015
Authors: František Lofaj, Rudolf Podoba, Michal Novák, Dušan Németh
Introduction Instrumented indentation provides a possibility to measure micro-, nanohardness and elastic moduli on small objects, including thin films, coatings and even individual grains because the direct measurement of the contact area is not necessary.
However, the necessary fitting parameters contain number of material and indenter properties, including coating strength, brittleness, tip rounding, etc. which does not provide fully unique solution [6].
Relatively recent comparison of these models by Iost et al. [9] indicated that the reliability of the hardness is inversely proportional to the number of parameters involved.
Online since: June 2005
Authors: Michael J. Pomeroy, Stuart Hampshire
During sintering, additives such as yttrium or rare earth oxides (with alumina) react with surface oxides on the silicon nitride particles and some of the nitride itself to form a M-Si-Al-O-N liquid (M=Y or Ln) which on cooling remains as a glass [1, 4, 5], located both at grain triple points and as intergranular films.
The desire to understand the nature of the intergranular oxynitride phases in silicon nitride resulted in a number of investigations on oxynitride glass formation, structure and properties [6-13] which have shown oxynitride glasses to possess higher glass transition temperatures, elastic modulus, viscosity and hardness compared to the corresponding oxide glasses because of the extra cross-linking within the glass structure as a result of the substitution of oxygen by nitrogen.
Overall, these effects can be assumed to be related to changes in the density of the glass network and the numbers of non-bridging oxygens as Al changes from a network ion (AlO4) to a modifying role (AlO6).
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