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Online since: August 2013
Authors: Alexandr Sergeevich Inozemtcev, Evgeniy Valerjevich Korolev
A number of researchers [12...16] described the physical and chemical processes on the surface of the glass microspheres, and investigated the activity of aluminosilicate microspheres.
Tiny particles of silica surround each grain of cement.
The number of floors can be increased.
Online since: September 2013
Authors: Hui Fen Li, Guo Dong Chen
Introduction People always focused on the effective use of sound economic transformation and expired deteriorative grain edible oil.
Tab.2 Technical parameters of test bio-diesel Fuels 0# pure diesel C10D90 C20D80 C30D70 Density (20℃)/ g·cm-3 0.8 0.814 0.828 0.842 Dynamic viscosity(40℃)/ mm2 ·s-1 5.45 6.11 6.258 6.855 Flashing temperature/ ℃ 78 83 88 94 Cetane number 51 50 49 48 Low heating value/ MJ ·kg-1 42.5 42 41.6 41 Cloud point/ ℃ 2 -15 -10 -10 Solidifying point/ ℃ -3 -18 -24 -21 Stable time(-10℃)(day) — 13 11 11 During the experiments, we founded that corn oil and diesel had good miscibility.
From the sixteen kinematic viscosity and cetane number could be seen, corn-diesel oil could be used as fuel in diesel engine.
Online since: October 2015
Authors: Andrey N. Chibisov
where Ssur – the nanocrystal surface area; Etotnano – the nanocrystal total energy; NZr – the number of zirconium atoms (NO = 2NZr – the number of oxygen atoms); – the total energy of bulk zirconia (per ZrO2 molecule).
Rawn, Crystallite and Grain-Size-Dependent Phase Transformations in Yttria-Doped Zirconia, J.
Online since: July 2008
Authors: Chung Gil Kang, J.W. Bae, S.M. Lee
Table 1 Chemical compositions (wt %) and thermal characteristics of aluminum alloys (Al6061) Zn Mg Cu Fe Si Mn Ti Al TL TS 0.03 0.98 0.30 0.15 0.62 0.03 0.01 Bal. 652°C 582°C This study investigates microstructural change in terms of pouring temperature of aluminum alloy melt, electric current of stirring, and stirring time and suggests optimum electromagnetic stirring condition to control grain size of the molten alloys to forge the material in semi-solid state.
No. 1 2 3 4 7 Fig. 3 Photographs of indirection rheoforging samples 4 5 6 7 0 50 100 150 200 250 300 350 Strength (MPa) Number of experimental condition Fig. 4 Tensile strength of forged samples after T6 heat treatment Position ① YS UTS Position ② YS UTS The mechanical strength at position ① becomes similar to one at position ② at above 170 MPa of applied pressure which is obtained to be the minimum applied pressure to average the mechanical strength over the entire cross section of the sample.
No. 6 (a) (b) (c) (d) Fig. 5 Microstructure of indirect-type rheo-forged sample 0 50 100 150 200 250 300 350 12 11 10 9 Strength (MPa) Number of experimental condition 8 Fig. 6 Tensile strength of indirect-type rheo-forged samples after T6 heat treatment Position ① YS UTS Position ② YS UTS Position (a) with which the punch contacts showed most liquid was extruded and solid particles were compressed.
Online since: October 2007
Authors: Georg Peter Ostermeyer
This can be done by the modification of the form of abrasive grain -this controls the density and the form of wear particles- and by introducing elastic belts, which controls the stability of the patch growing process.
Input power Output power (Stick) slip resistance on contact patch Wear Temperature Wear debris / particle Number of contact patches Size of contact patches Friction boundary layer Friction power 2.
-P.: "On the dynamics of the friction coefficient" WEAR 254 (2003), 852-858 [OST.05] Ostermeyer, G.P., Müller, M.: "New developments of friction models in brake systems"; SAE Paper Number 2005-01-3942 Proceedings of the 23rd SAE Brake Colloquium and Exhibition, Orlando (2005), 187-200, also in SAE 2005 Transactions Journal of Passenger Cars - Mechanical Systems, 3078-3090 [OST.06a] Ostermeyer, G.
Online since: February 2007
Authors: Ying Zhang, Zhi Wu Chen, Xu Ming Chen, Xuan Cheng, Zhen Ya Lu
Introduction It is well known that under many circumstances when ferroelectric ceramics are switched under high a.c. field, the switched charge and the induced strain decay with increased number of cycles [1~3], which is the so-called electrical fatigue.
In Fig.2, the normalized remnant polarizations Pr were plotted against the number of the cycles for different magnitudes of the applied sine wave electrical field (50Hz).
As the different crystals cannot be switched simultaneously during the polarization reversal [7], so generates stress concentrations at the grain boundary.
Online since: January 2010
Authors: Christophe Desrayaud, O. Siret, M.A. Tourabi
The addition of manganese controls the grain structure which in turn results in a stronger alloy, thus replacing 6061 in many structural applications (Tab.2).
To find a window of joinability, many parameters have to be set: the compression force and its type of solicitation (monotonic or cyclic, with a variable mean value or not), the torsion angle amplitude and its period (thus defining the speed of rotation), the number of cycles, the surface polishing at the interface.
In order to valid this interpretation, a second protocol has been conveyed: a torsion test specimen has been cut through its section and undergoes a compression followed by a cyclic torsion with small angles during a great number of cycles.
Online since: December 2011
Authors: Xing He Lu, Dong Han, Guang Qing Zhang, Nan Ma, Si Fei Liu
Fig.2 Charge-discharge curves of first cycle(a) and variation of specific capacity with number of cycles (b)of the coated(sample B) and uncoated(sample A) LiCo0.02Cr0.02Mn1.96O4 cathode materials at 20˚C Fig.3 Charge-discharge curves of first cycle (a)and variation of specific capacity with number of cycles(b) of the coated(sample B) and uncoated(sample A) LiCo0.02Cr0.02Mn1.96O4 cathode materials at 55˚C Fig.3 shows that the electrochemical performance of the coated(sample B) or uncoated(sample A) LiCo0.02Cr0.02Mn1.96O4 cathode materials is evident difference at 55˚C.
This indicated that the surface of LiCo0.02Cr0.02Mn1.96O4 grains had some changes.
Online since: November 2007
Authors: Jean Michel Bouler, François Pecqueux, Nathalie Payraudeau, Franck Tancret
(1) with pmacro the overall macroporosity, pmicro the remaining solid matrix microporosity, m a morphological dependent parameter, Nc the average number of closest neighbours for each matrix grain, and σr0 the compressive strength of the fully dense material, i.e. with pmicro = pmacro = 0.
Ceramic blocks always contain a large number of natural flaws (microcracks, little holes, mechanical weak points).
Online since: August 2007
Authors: K.H. Lang, Detlef Löhe, Scheida Seyedi
Adequate procedures are the reduction of the porosity or the reduction of the number of large pores by warm pressing, high temperature sintering or sinter forging as well as suitable heat treatments [3].
In the as sintered state a relatively homogeneous structure is found consisting of upper bainite with very fine line-like carbides within the bainite grains.
As ultimate number of cycles NU = 10 7 cycles were assigned. 103 104 105 106 107 108 100 200 300 400 500 as sintered R = -1 F = 45 Hz 90% 50% 10% 255 MPa 280 MPa 300 MPa σ *a,R [MPa] Nf 103 104 105 106 107 108 100 200 300 400 500 as sintered R = 0.1 f = 45 Hz 90% 50% 10% 228 MPa 195 MPa 170 MPa σ *a,R [MPa] Nf Fig. 1: Geometry and dimensions of the bending specimens.
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