Search results

Previous paper showed the relations between the explosive distance from bottle, the explosive velocities in the case of one bottle and the "Cullet" grain size distributions.
The experiments were executed in nine kinds of patterns according to the inside state of bottle (air charge or water charge), the number of bottles (1,2,3), the arrangement of bottles (series or concentric circle), the amount of explosive and the shape of explosive (stick type or sphere type) shown in Table 1
In this arrangement, the "Cullet" size distributions are almost constant regardless the number of bottles.

The number of calcareous nodules in each group can be calculated from the result, and then the anisotropic ratio is obtained according to the standard deviational ellipse about the above results: the main orientation angle is 86.55◦, and the anisotropic ratio is 82.6%, which indicates that the anisotropic ratio of this sample is large.
Granularity dimension of calcareous nodules is calculated as Dg, w here εis the particle diameter, N (ε) is the number of particles smaller than the particle diameter.
(in chinese), 2004, 26: 244-247 [10] WANG Baojun, Theories and methods for soil grain orientation distribution in SEM by standard deviational ellipse.

Fig.3 Wave port Waveport1 Fig.4 Wave port Waveport2 When calculating the parameters, assuming the Solution Frequency(i.e. frequency adaptive grid subdivision) is 10GHz, Maximum Number of Passes is 20, Maximum Delta S is 2%，Number of Modes is 1，analyzing the lowest order mode.
Advances in sensing grain moisture content by microwave measurements[J].

Up to now, a number of high damping alloys such as Mn-Cu and Fe-Cr have been developed and successfully applied in ship and railroad industries [3, 4].
Further increasing Nb content to more than 1%, large amounts of white particles with irregular morphology present and most of them are distributed along the grain boundaries.
(ii) A number of particles with various sizes are randomly distributed inside the ε martensite, at the ε martensitic variants boundaries and γ/ε interfaces.
Shin et al. [30] found that, in Fe-17Mn, the ultra-fine grained sample containing a low volume fraction of ε martensite possesses a damping capacity comparable to that of the coarse-grained sample with a high ε martensite fraction.
De Cooman, The effect of grain size on the damping capacity of Fe-17 wt%Mn, Mater.

Great emphasis is placed on the study of protection against sulphate corrosion and there are a big number of studies focused on predicting its course [7], [8], [9], [10].
At the same time, a number of studies are focused on slowing down degradation by partial substitution of suitable additives and secondary raw materials for Portland cement [12], [13].
As for FBC fly ash, fly ash particles do not melt, grains remain porous, their structure is layered and they have a large specific surface area.
Waste foundry sand contains grains of fraction which are smaller than 4 μm and they are used as microfiller.
Recommended replacement rate for fine grain fractions is in the range of 20–30% [25].

In this paper, aluminum alloy 7075 is used as the raw material to study the tensile strength of the welding interface and the development of welding seam and grains by using local compression test.
The cut specimen is milled by waterproof abrasive paper of different numbers (#_240, 400, 600, 800, 1200, 1500, 2000, 2400, 4000), and then finished by 0.5μm Al2O3 powder aqueous solution.
On the lower billet, different grains have obvious black lines in different directions, it may because of the new plane direction resulted from the heating pressing process.
The grains in main body specimen, as shown in Fig. 14(a) and (b), are round, whereas long and narrow grain shape is formed on flash part specimen due to material shear flow.
The metallurgical structure observed through OM: (a) upper specimen of main body; (b) lower specimen of main body; (c) flash part has long grains and almost no seam.

Analytical surveillance programmes by food controlling agencies are required to control aflatoxin contamination of food grains and human exposure.
This method is recommended for detection and quantification of the less toxic aflatoxin B2, which is presented in grains.
Currently, the easy availability of ELISA kits has paved the way for analysis of large number of samples simultaneously.
This technique has been successfully applied for analyzing aflatoxins in grains and peanuts [51].
Pascale, Detection methods for mycotoxins in cereal grains and cereal p roducts, Matica Srpska Proceedings for Natural Sciences 117 (2009) 15-25

Depending on the size of the volumes in which they manifest (appears an heterogeneity of deformation) are defined the following categories of residual stresses [3, 10, 12]: a) macrostresses: - first order residual stresses (macroscopic) (), which causes deformations and develops in the deformed piece at a larger scale than the grain size of the material or a significant volume element (millimeters), they result from the balance of internal forces and correspond to an average value of all the material; b) microstresses: - second-order residual stresses (microscopic or intergranular) () acting at the grain scale (micrometer), they are almost always at polycrystalline materials because the elastic and thermal properties of neighboring grains are different; their value is a stress variation of every grain around the average value, represented by the () stress; () stresses are referred to as homogeneous microstresses
- third-order residual stresses or ultramicroscopic (), acting on the level of atoms, due to the presence of dislocations or other crystal lattice defects (at a scale on the order of a few tens of nanometers), they are found in materials with multiphasic microstructure, being generated by the phasic transformations; their value fluctuates around the mean value of the stresses of a grain (); stresses can be called heterogeneous microstresses.
Recent specialized literature [14], suggests a concept of residual stress management and a number of engineering tools to analyze the major aspects of residual stresses.

The accumulation surface④ is level and its friction coefficient is 0.4. ① ② ③ ④ ①sliding surface ②mounding trough ③motion surface④accumulation surface Fig.2 Numerical Experimentation Model 2.2 Generate sample and set parameter Comprehensive calculation efficiency, the grain composition of physical model and similar degree and particle size distribution, the grain size will be enlarged in order to reduce the grain number and computing workload, and improve the calculation efficiency, eventually, 501 particles are generated, which diameter of its size range is 0.1-0.3 m.
Monitoring results of average contact force and average unbalance force between particles and monitoring results of y direction action force the change of the retaining wall of fill the tank (figure 3, 4) showed that average contact force between particles stable, unbalance force tend to zero, accumulation grains get to stable equilibrium state.
[10] LU Xiao-bing, ZHANG Xu-hui ，Numerical simulation of clastic grain flow along a slope[J], Rock and Mechanics，2009，Vol.30 Supp.2：524-527( in Chineses) [11] LIU Jian-bao, WANG Nai-ang, etc, Influencing Factors of Respose Angle of Sand Dunes: an experiment[J], JOURNAL OF DESERT RESEARC, 2010 ,Vol.30 No.4,758-762( in Chineses) [12] Jiang Peng,Yang Shubi, EXPERIMENT STUDY ON RHEOLOGIC BEHAVIOR AND LONG TERM STRENGTH OF GRAVEL IN CHENGDU AREA[J], Journal of Geological Hazards and Environment Preservation, 1998,Vol.9 No.1,38-42( in Chineses)

However, when a jump is attempted, there will be a certain number of atoms forming a ring to obstruct the jump.
But this can be a reasonable approximation because the XRD measurements on nano ZnO reveals zincblende structure where lattice parameters and grain size are found out.
After the evaluation of phonons from the modified rigid ion model, both the real and imaginary parts of the Green’s function G and F are worked out from the computed phonons as (3) (4) where n is number of atoms in unit cell, α and β are the degrees of freedom, is the wave vector, l the unit cell and e the eigen displacement.
Diffusivity The attempt frequencies for various isotopes are computed at different temperatures and the corresponding diffusion coefficient for the self- diffusion of anions and cations in ZnO are evaluated by using, (8) can be estimated using the relation, (9) where H is Haven’s ratio, d is the jump distance, n represents number of identical jumps.
This is in concurrence with the experimental result observed by Nogueira et al. [3] for ZnO polycrystalline ceramics with grain size (20 nm) at 1279 K where it is 5.34X10-14 cm2/s.