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Online since: August 2019
Authors: M.T. Prathap Kumar, H. Muralidhara, C. Jairaj
Over the years, number of methods have been developed for soil stabilization in particular and ground improvement in general [3,4,5].
Table 2 Properties of Bio-enzyme Used in the Study Properties Values Boiling point 2120F Specific gravity 1.000 to 1.090 Evaporation rate Same as water Solubility in water Complete Appearance /Odour Brown liquid, On -Obnoxious Melting point Liquid pH value 4.30 to 4.60 Methodology The physical properties like moisture content, specific gravity of fine grained BC soil was obtained as per IS:2720 (part.
The strength gained is 1.7 times that of BC soil alone. 5) With the help of SEM test we can observe that the maximum number of voids has been removed and good compaction with minimum comp active effort at 50ml/m3 Bio-enzyme and 3% of lime was obtained. 6) Compaction characteristics of BC soil addition with different percentage of lime and Bio-enzymes, results coupled with XRD and SEM study conclusively shows that beneficial effect of the use of treatment of Bio-enzyme, lime in terms of increase in MDU and reduction in corresponding OMC.
Table 2 Properties of Bio-enzyme Used in the Study Properties Values Boiling point 2120F Specific gravity 1.000 to 1.090 Evaporation rate Same as water Solubility in water Complete Appearance /Odour Brown liquid, On -Obnoxious Melting point Liquid pH value 4.30 to 4.60 Methodology The physical properties like moisture content, specific gravity of fine grained BC soil was obtained as per IS:2720 (part.
The strength gained is 1.7 times that of BC soil alone. 5) With the help of SEM test we can observe that the maximum number of voids has been removed and good compaction with minimum comp active effort at 50ml/m3 Bio-enzyme and 3% of lime was obtained. 6) Compaction characteristics of BC soil addition with different percentage of lime and Bio-enzymes, results coupled with XRD and SEM study conclusively shows that beneficial effect of the use of treatment of Bio-enzyme, lime in terms of increase in MDU and reduction in corresponding OMC.
Online since: January 2010
Authors: Michael Tatoulian, Farzaneh Arefi-Khonsari, Jean Pascal Borra, A. Valt
Here, the mass deposited per surface unit is controlled by the substrate velocity
and the number of passages under the spray, at constant flow-rate and distance between the substrate
and the spraying nozzle defining the deposition spot diameter on the substrate.
(a) 1 µm 1 mL/h 10 µm coating PE substrate (b) 1 µm 10 µm thick PS Substrate Coating surface Figure 4 : SEM pictures of (a) polyacid deposited on PE at 1 mL/h upper and side view ; (b) polyether deposited on PS at 0.5 mL/h upper and side view The mass deposited per surface unit is controlled by the liquid flow rate, the substrate velocity and the number of passages under the spray.
Besides, for very small deposited mass per surface unit, individual drops can be deposited for surface processing with particular shapes of agglomerated polymer grains formed by polymerization within each drop that can be of interest to increase the specific exchange surface for sensors.
(a) 1 µm 1 mL/h 10 µm coating PE substrate (b) 1 µm 10 µm thick PS Substrate Coating surface Figure 4 : SEM pictures of (a) polyacid deposited on PE at 1 mL/h upper and side view ; (b) polyether deposited on PS at 0.5 mL/h upper and side view The mass deposited per surface unit is controlled by the liquid flow rate, the substrate velocity and the number of passages under the spray.
Besides, for very small deposited mass per surface unit, individual drops can be deposited for surface processing with particular shapes of agglomerated polymer grains formed by polymerization within each drop that can be of interest to increase the specific exchange surface for sensors.
Online since: January 2017
Authors: Maria Luigia Muolo, Alberto Passerone, Fabrizio Valenza
If we denote with ci¢ the mole fraction of component i in one of the two phases and with V¢ its volume, then the number of moles ni¢ is given by:
(14)
Similarly for the second phase, we have:
(15)
For the model to be equivalent to the real system, a number of moles nis must be attributed to the parting surface in such a way that:
(16)
where ni is the total number of moles of component i in the system.
The amount nis represents the number of moles adsorbed at the surface, or "surface excess", and can assume both positive and negative values.
Similarly, the molten Ni alloy penetrates along the grain boundaries of the ceramic substrate.
A noticeable crystallization of HfB2 grains is also found at the solid-liquid interface.
In recent years the increasing interest in ultra high temperature ceramics has led to a number of new studies specifically related to joining processes, mainly by means of brazing.
The amount nis represents the number of moles adsorbed at the surface, or "surface excess", and can assume both positive and negative values.
Similarly, the molten Ni alloy penetrates along the grain boundaries of the ceramic substrate.
A noticeable crystallization of HfB2 grains is also found at the solid-liquid interface.
In recent years the increasing interest in ultra high temperature ceramics has led to a number of new studies specifically related to joining processes, mainly by means of brazing.
Online since: September 2013
Authors: Cristina E. Lanivschi, Emanuela Decher
The experimental program consists in performing the bending test of timber beam type structural elements, considering two types of cross-sections, the first being composed by joining three timber boards of 24x90x1800 mm by aid of screws and the second, with wood/GFRP hybrid cross-section, having the same number of timber boards as specified above joined together by two 3x90x1800 mm GFRP interposed lamellae.
Considering the material results obtained from the four points bending test of composed timber beam, CTB, section it may be stated that it pertains to C22 strength class, according to European standard EN 338, with a characteristic bending strength of 22 MPa and a mean modulus of elasticity parallel to the grain of 10 GPa.
Considering the material results obtained from the four points bending test of composed timber beam, CTB, section it may be stated that it pertains to C22 strength class, according to European standard EN 338, with a characteristic bending strength of 22 MPa and a mean modulus of elasticity parallel to the grain of 10 GPa.
Online since: April 2008
Authors: Graeme E. Murch, Elena V. Levchenko, Alexander V. Evteev, Irina V. Belova
This may lead to excessive solid-state diffusion and
hence possibly to an increased density of faults and defects in the crystal structure, moreover, bulk
order may be broken at the grain boundaries and interfaces.
The surface energy is then difference between the energy of the slab and that of an equal number of atoms in the bulk.
Time dependences of the number of (a) Ni atoms having an icosahedron as a coordination polyhedron in total as well as constituting the largest cluster from interpenetrating icosahedra and (b) number of atoms involving in the construction of the icosahedra with a Ni atom in the centre.
The forming of such a five-layer A'A"KA"A' surface structure results in a third of surface Pd atoms having increased their number of nearest neighbours from 9 (the close packed f.c.c. (111) surface) to 13 (see also Table 2).
The number of Pd atoms in each couple layers A' and A" coincides with the number of Ni atoms in the Kagomé net layer, therefore, the total atomic fraction involving in build up of the five-layer A'A"KA"A' surface structure in the nanoparticle with consideration of some imperfection of icosahedral order in Kagomé net layer can be estimated at ∼ 70 %.
The surface energy is then difference between the energy of the slab and that of an equal number of atoms in the bulk.
Time dependences of the number of (a) Ni atoms having an icosahedron as a coordination polyhedron in total as well as constituting the largest cluster from interpenetrating icosahedra and (b) number of atoms involving in the construction of the icosahedra with a Ni atom in the centre.
The forming of such a five-layer A'A"KA"A' surface structure results in a third of surface Pd atoms having increased their number of nearest neighbours from 9 (the close packed f.c.c. (111) surface) to 13 (see also Table 2).
The number of Pd atoms in each couple layers A' and A" coincides with the number of Ni atoms in the Kagomé net layer, therefore, the total atomic fraction involving in build up of the five-layer A'A"KA"A' surface structure in the nanoparticle with consideration of some imperfection of icosahedral order in Kagomé net layer can be estimated at ∼ 70 %.
Online since: November 2016
Authors: F. Borit, G. Rolland, M. Jeandin, N. Fabrègue, F. Delloro
The particles are deposited one after the other, in a number which can be unlimited.
In contrast, a rapid growth increases the number of pores, which decreases hardness.
Up to now, (almost) only conventional powders, which were formerly developed for conventional thermal spray, i.e. plasma and flame spray, were used in cold spray, in a finer grain size at best.
In addition, the continuous growth in the number of citations until stabilization in 2010, concurrently with a decrease of the number of publications, does exhibit the process expansion, including in industry (Fig.16).
The colors are all the warmer because the number of publications is high, after K.A.
In contrast, a rapid growth increases the number of pores, which decreases hardness.
Up to now, (almost) only conventional powders, which were formerly developed for conventional thermal spray, i.e. plasma and flame spray, were used in cold spray, in a finer grain size at best.
In addition, the continuous growth in the number of citations until stabilization in 2010, concurrently with a decrease of the number of publications, does exhibit the process expansion, including in industry (Fig.16).
The colors are all the warmer because the number of publications is high, after K.A.
Online since: October 2022
Authors: Jian Zhang, Yuan Yuan Guo, Yu Shi Luo, Mai Zhang, Chen Guang Liu, Jian Wei Xu
The [001] oriented A3 single crystal bars (170mm in length and 15mm in diameter) were prepared by spiral grain selection method and directional solidification method (HRS).
A large number of secondary cracks appeared near the fracture surface.
The number of secondary cracks and the size of pores were small when the withdrawal rate was 4.5mm/ min, and the number of pores was larger at 3mm/ min and 12mm/ min.
As shown in Fig. 8, the number of TCP phases in the dendrite was significantly higher than that under other conditions when the withdrawal rate was 3mm/ min.
As shown in Fig. 3, when the withdrawal rate increases from 3mm/ min to 12mm/ min in this study, the number of pores decreases first and then increases.
A large number of secondary cracks appeared near the fracture surface.
The number of secondary cracks and the size of pores were small when the withdrawal rate was 4.5mm/ min, and the number of pores was larger at 3mm/ min and 12mm/ min.
As shown in Fig. 8, the number of TCP phases in the dendrite was significantly higher than that under other conditions when the withdrawal rate was 3mm/ min.
As shown in Fig. 3, when the withdrawal rate increases from 3mm/ min to 12mm/ min in this study, the number of pores decreases first and then increases.
Online since: July 2011
Authors: Ionut Popovici, Cosmina Toader, Maria Duta, Mirabela Gosman, Dana Perniu
The literature mentions vibrations in the region: 1620 cm-1 [9], 1635, 1639, 1639, 1621 cm-1 [10], 1630 cm-1 [2], the different positions being explained by different coordination numbers in the complexes.
The highest roughness corresponds to the sample containing micelles in the precursor solution, where nucleation can start near the film surface and nano-grains can form, as nucleation center, in the nano-reactor represented by the micelle.
Acknowledgements This work was supported by CNCSIS_UEFISCDI project number PNII – IDEI 840/2008, Romania.
The highest roughness corresponds to the sample containing micelles in the precursor solution, where nucleation can start near the film surface and nano-grains can form, as nucleation center, in the nano-reactor represented by the micelle.
Acknowledgements This work was supported by CNCSIS_UEFISCDI project number PNII – IDEI 840/2008, Romania.
Online since: January 2010
Authors: Toshiyuki Takagi, Takanori Takeno, Hiroyuki Miki
Depending on the deposition
condition, the microstructure of an Me-DLC coating is basically nanometer-sized metal grains
dispersed in amorphous hydrogenated carbon host matrix.
As can be seen in the figure, the friction coefficients of both W-DLC coatings increased with increasing cycle number.
Mechanisms for such friction behavior are still not clear but the W-DLC layer plays an important role in the reduction of the number of cycles required for the completion of the running-in process.
As can be seen in the figure, the friction coefficients of both W-DLC coatings increased with increasing cycle number.
Mechanisms for such friction behavior are still not clear but the W-DLC layer plays an important role in the reduction of the number of cycles required for the completion of the running-in process.
Online since: December 2011
Authors: Di Li, Ying Jun Jiang
Satisfying the deviations
Graded broken stone
Aggregate property
Aggregate gradation
particle model converted into round shape
micro-mechanic parameters
Grain flow model
Simulation test
Simulation results
Sample molding
Testing process
Generation of virtual samples
simulated loading process
Laboratory test
Test result
simulated testing conditions
Reliability analysis
the CBR Numerical Value Testing Method for Graded
not satisfying the deviations
Numerical simulation
Laboratory test
Contact constitutive model
Simulated Load Plate
Simulated Pressure Head
Figure 3-1 Construction Principles for CBR Numerical Experiment on Graded Macadam
5cm
5cm
5cm
Simulated Load Plate
12cm
15cm
Figure 3-2 Schematic Drawing for the Loading Process of the CBR Numerical Experiment
The CBR laboratory test and Numerical Value Simulation were carried out according to the grading in Table 3-1.
Table 3-1 Comparison between the CBR Actual Measurement Results and Simulated Results Serial number Mass percentage passing the following sieve pores (mm) Actual measured value (%) Simulated value (%) Deviation (%) Average deviation (%) 31.5 19 9.5 4.75 2.36 0.6 0.075 1 100 64 52 40 34 25 15 495 525 6.06 5.02 2 100 64 52 40 30 17 7 595 627 5.37 3 100 61 48 35 30 22 13 518 552 6.56 4 100 61 48 35 26 15 6 655 676 3.21 5 100 58 44 30 25 18 11 626 642 2.56 6 100 58 44 30 22 13 5 692 736 6.36 According to Table 3-1, deviations between CBR simulated values and actual values of each gradation are all within 7%.
Acknowledgement The project was supported by the Special Fund for Basic Scientific Research of Central Colleges, Chang’an University (item number: CHD2011ZY007), Chang’an University basic research support program and Traffic Paving Materials Ministry of education Engineering Research Center.
Table 3-1 Comparison between the CBR Actual Measurement Results and Simulated Results Serial number Mass percentage passing the following sieve pores (mm) Actual measured value (%) Simulated value (%) Deviation (%) Average deviation (%) 31.5 19 9.5 4.75 2.36 0.6 0.075 1 100 64 52 40 34 25 15 495 525 6.06 5.02 2 100 64 52 40 30 17 7 595 627 5.37 3 100 61 48 35 30 22 13 518 552 6.56 4 100 61 48 35 26 15 6 655 676 3.21 5 100 58 44 30 25 18 11 626 642 2.56 6 100 58 44 30 22 13 5 692 736 6.36 According to Table 3-1, deviations between CBR simulated values and actual values of each gradation are all within 7%.
Acknowledgement The project was supported by the Special Fund for Basic Scientific Research of Central Colleges, Chang’an University (item number: CHD2011ZY007), Chang’an University basic research support program and Traffic Paving Materials Ministry of education Engineering Research Center.