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Online since: August 2013
Authors: Antonello Germinario, Antonella Schibani
The present study provides the results of a number of laboratory tests carried out on the soil collected at Grazzanise airport as well as CBR indexes measured in-situ in order to corroborate the results obtained in the laboratory.
To this end, a number of in situ and laboratory tests were carried out on the soils samples collected at Grazzanise military airport in order to conduct testing for sieve analysis with pre-washing, Atterberg limits, soil density and moisture, soil classification and CBR on lime-stabilized soil samples.
Soil Classification [4] Nomenclature Grain size, diameter d [mm] Percent passing [%] Clay d < 0,002 2,0 Silt 0,002 < d < 0,06 94,3 Sand 0,06 < d < 2 2,7 Gravel 2 < d < 60 1,0 Cobble d > 60 0,0 NOTE: 1mm = 0,04 in Hydrated lime was used during the first laboratory test.
A number of checks were performed on homogeneity and moisture of the mixture, as well as on the current depth of the mixing machine, at the end of mixing.
Online since: April 2008
Authors: Markus Eberstein, Guido Mann, Jens Vogel, M. Zoheidi, Jörg Krüger
Sample surfaces underwent a polishing procedure with Ce2O3, Al2O3 and diamond suspension down to grain diameters of 0.25 µm which were controlled carefully by light microscopy and scanning electron microscopy to ensure that the influence of the surface preparation on the results of the LIDT measurements was negligible.
For a given laser fluence F0 and number of pulses per spot, ten test sites on the samples were illuminated.
For a given laser fluence, the number of damaged samples was counted.
Fiber type numbers indicate core-cladding diameters.
Online since: July 2014
Authors: Lin Xu, Guo Zhi Zhang
(4) Requirements of coarse aggregate grain size is not greater than 30mm to ensure the pouring quality.
One should increase the vibration time and vibrating point number until around the box without bubbles,Vibrator should avoid touching the box
We suppose a number of columns for n boxes of a pouring area.
Secondly, the new method does not increase the number of workers.
Online since: December 2013
Authors: Yeon Wook Kim, Jae Hoon Kim, Bo Hwi Seo, Hoon Seok Choi, Sung Han Park, Hwan Kyu Lee
(a) Upper Specimen (b) Lower Specimen (c) Reciprocating wear test Fig.1Schematic Diagram of test specimens and reciprocating wear test Table 1 The mechanical properties of graphite, HK-6 Density [g/cm3] Flexural Strength [MPa] Grain Size [μm] Shore Hardness [Hs] 1.86 85 3 68 Table 2 The mechanical properties of W-25Re Density [g/cm3] Tensile Strength [MPa] Poission Ratio Shear Modulus [GPa] Shore Hardness [Hs] 19.7 1370 0.29 159 43 Experimental work Experimental Materials.Graphite HK-6, the test material, is made by the Tokai Carbon Co.
There have been many attempts to predict sliding wear rate and the wear formula of Archard is the most acknowledged in the field[8]: V=kSFNH (1) Where V is the volumetric wear, k is the dimensionless wear coefficient, s is the sliding distance, FN is the applied normal load, and H is the hardness number of the softer material.
Ltd, Korea) Experimental Design.The response surface methodology (RSM) consists of agroup of techniques used in the empirical study of relationshipsbetween one or more measured responses and a number of inputfactors.
(3) Where X1, X2, . . , Xk are the input factors which affect the response Y andk is the number of input factors asβ0, βi(i=1, 2, . . , k) and βij(i=1,2, . . , k, j=1,2, . . , k)are the unknown parameters (regression coefficients or parameters) and ε is random error.
Online since: March 2014
Authors: Dietmar Eifler, Robert Skorupski, Marek Smaga
The microstructure is homogeneous with a small grain size of 17 µm determined including twins.
The same number of cycles did not cause any change of the surface topography of the MSLp specimens (comp.
In contrast, the specimens with MSLp achieved the same number of cycles without failure.
Already after 10 cycles (about 1 % fatigue life) a higher number of slip bands was observed at ASLp specimens.
Online since: September 2017
Authors: Maria Evgenievna Bezmogorychnaya, Etibar Yusif O. Balaev, Zhesfina Blednova, Peter Olegovich Rusinov, Anna Pavlovna Yurkova
HVOF process was carried out on the modernized GLC (patent number 2,535,432), equipped with a vacuum chamber, a device for moving the flame burner, technology module for ion cleaning of components surfaces, the device supplying the liquid nitrogen, gas supply system, a device for surface plastic deformation of the coating.
The investigations have shown that the SM of TiNi allows you to manage the technological heredity [8] and achieve stable quantitative result of a number of characteristics (surface roughness, grain size, fractal dimension, adaptability), and a complex of properties (microhardness, cyclic durability, endurance limit, wear rate).
The technological process of surface layers formation with shape memory materials in a single technological cycle (Pat number 2,502,829) provides for SPD operation training.
Online since: May 2020
Authors: S. Sidelnikov, Denis Voroshilov, M. Motkov, M. Voroshilova, V. Bespalov
Also, with an increase in the number of rare-earth metals in an aluminum alloy, the number and size of intermetallic compounds increases with the classical methods of preparing the ingot, which negatively affects all the properties of the wire.
In the process of high-quality rolling and drawing of a bar Ø5 mm, obtained by the CRE method, there is no change in the size and shape of the phases, their location and number, the vast majority of particles have a size not exceeding 1 μm.
The grain structure of the wire was not evaluated due to the fact that due to the small cross section it was not possible to deposit an oxide film.
Online since: August 2015
Authors: Hilda Kundai Chikwanda, Ronald Machaka, Mandy Seerane
These factors include particle size of the metal powder [6], [7], compact’s size and shape complexity [8], type and number of binder components [9].
Table 1 shows the debinding and sintering variables and the number of levels chosen for the experiments.
(1) Where, Yij is the amount of score for the rate of mass loss and n is the number of times the rate of mass loss was measured.
A lamellar alpha phase (white) and a beta phase along the grain boundaries (grey) are observed on the microstructure.
Online since: March 2009
Authors: Vladislav Kozák, Zdeněk Chlup, Ivo Dlouhý, Selen Gürbüz, Arcan F. Dericioglu
There is also a number of different types of ceramic composite materials where a toughening effect is achieved by application of whiskers, short and long fibres, particles, phase transformation toughening, using laminated and micro-laminated structures and/or their combination achieving so-called hybrid composites.
Results from these experiments are summarised in Fig. 5 together with average data (represented by full line) obtained using the standard three point bend test on CNB bar specimens. 0 1 2 3 4 5 6 7 8 9 10 11 Sequence number 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 Fracture toughness [MPa.m1/2] Soda lime glass chevron notch in tension CNB 3x4 S=16 mm Fig. 5 Comparison of fracture toughness obtained using eccentric tension and three-point bending on notched specimens prepared from soda-lime glass.
This strong dependence of fracture properties on number of reinforcing fibres in the process zone cannot be explained only by weakening of the apparent interface due to presence of fibre matrix interface.
The regions close to the fibre exhibit significant grain growth during sintering which leads to lower fracture resistance.
Online since: June 2020
Authors: Ben Jiao Li, Bin Rong Ma, Yong Jing, Zhe Ming Zhang, Zhi Jia Li, Si Yi Zhao, Song Li
The results show that this method improves the grinding efficiency and produces the powder with real nanometer grain structure.
Preparation of Silver-Series Nano-Antibacterial Materials by Biological Method A large number of studies have shown that the AgNPs synthesized by chemical method is expensive, and the reductants, surface modifiers and stabilizers used in the synthesis process pollute the environment.
A large number of scholars have shown that bacteria can be used to prepare AgNPs.
Fungi can secrete a large number of enzymes and are easy to grow on various media, so they are considered to be a suitable choice for biosynthesis of AgNPs.
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