Search results

The results showed: the rock salt had many characteristics such as thicker layer, higher salt content, larger solubility, quicker leaching rate and easier dissolveing softening; natural rock salt close-grained microstructure and high limit compressive strength; rock salt did not soften and had smaller residual strain, which proved that rock salt was a suitable embankment packing in cyclic loading.
There is a large number of rock salt, which takes on high salt content and abundant reserves in Qarham Salt Lake area.
Fig.3 The uniaxial compressive strength test of rock salt Table 1 The uniaxial compressive strength test results of rock salt Sample name Numbers The average area (mm2) Damage load (kN) Limit strength (MPa) Average value (MPa) Remarks Artificial brine crystallization of rock salt 1 10061.9 34.00 3.38 1.99 2 10414.3 6.19 0.59 3 10190.6 5.99 0.59 4 10286.8 22.20 2.16 5 7576.8 33.20 4.38 6 9905.1 8.30 0.84 Natural rock salt 1 10537.1 78.30 7.43 4.47 Vertical bedding 2 10572.9 72.90 6.89 Vertical bedding 3 10516.5 51.60 4.91 4 10434.6 20.60 1.97 5 10133.3 17.80 1.76 6 9825.3 43.30 4.41 7 9364.2 36.40 3.89 Salt ground over the surface of saline soil 1 10235.0 55.90 5.46 6.64 Vertical bedding 2 10268.2 66.20 6.45 Vertical bedding 3 8770.3 63.70 7.26 Vertical bedding 4 7697.7 56.70 7.37 Vertical bedding The results are showed in Table 1: the limit compressive strength of rock salt about artificial crystal brine was 0.59~4.38 MPa, and average value was 1.99 MPa; the limit
The filler of fine-grained composition changes the particles distribution and samples distribution.
The number of times of vibration compaction determined was generally less than 3 times according to the test; 4) Compaction testing used sand replacement method or ground radar detection method, the degree of compaction was not less than 95%.

The basal plane dislocation (BPDs) and threading screw dislocation (TSDs) cause from the seed crystal and formed at the initial stage of growth were gradually decreased in number along the length of the crystal and under certain conditions such as distorted stresses, dislocations were converted into other types of dislocations.
In particular, initial stages of PVT growth process are likely to be important because it has been known that a number of dislocations generated near the interface between a seed and the grown crystal [4-7].
Therefore, if the nucleation density is lower, it is expected that the small angle grain boundaries penetrating along the c-axis will be reduced and the resulting TEDs density will be decreased.
A considerable number of TEDs were observed in (-25,0) portion and a large number of TEDs arrays were observed in step flow dominant area of middle substrate.
BPDs and TSDs cause from the seed crystal at the initial stage of growth were gradually decreased in number along the length of the crystal.

Depending on application, it is possible to form crystalline powders with a given ratio of volumetric phases PbSe and PbSeO3 in a separate grain. 
The principal possibility of forming the smallest (up to nanometer) grains of lead selenide in the dielectric matrix of lead selenite is shown. 
Materials and Methods The peculiarity of the method of production of the two-phase composite (1-х)PbSe·xPbSeO3 is the usage of PbSe as a precursor and a deliberate limitation of the number of elements of the two-phase composite to only lead, selenium and oxygen, in order to control the structure, morphology and properties and establishing a functional peculiarities.

They describe the sum of stresses distributed over a large number of grains.
Considering residual stresses on grain scale, type II, micro or inter granular stresses (type II) are determined.
The example shows a possible number of cycles between n = 500 and 2.000.
As depicted by the grey highlighted area in figure 4, b, the range of possible numbers of load cycles strongly increases with a decreasing relaxation gradient for high numbers of cycles.
The example shows a possible number of load cycles between n = 4 and >10.000.

Improving the properties of plaster composition is associated with increasing thickness of the layer of tumors, membrane water absorption of the grain powder adhesive cement and CSP due to hydration of the interior of the particles or the evaporation of water in the system.
Adhesive strength formulations number 9 - 12 those are based on gray PC 400M, CSP, marble and sand slurry in an amount from 0 to 15% Numbers 10 - 12 have a different mechanism of failure.
The maximum score was recorded by number 12 (15% slurry) on a brick base - 0.813 MPa on the concrete - 0.755 MPa (Figure 4).
CSP particles have a rough surface; it provides better adhesion to the more dispersed grains of carbonate mud.
In this state, it could be added to the plaster composition number 14 – 16.

And the grain sizes were measured by a Scherrer Calculator, in accordance with the XRD results.
Little grain sizes means the film have more interface boundaries.
So the smaller grain size was one of the feasible interpretations of microhardness increase for the ZrTiN films.
Although large internal stress can increase the microhardness of the film, the adhesion of the film and the Sample number Microhardness /GPa substrate will be reduced with too high internal stress.

But the glue layer cracking failure was not carried on [6].Zhao Xuesong applied ANSYS to simulate bamboo strip surface compression performance, through the comparison between the experimental results and simulation’s, the simulation results are desirable [7] .Ma Jianfeng designed the similar bamboo structure system using bionics principle, and used FEM to verify its performance [8] .V.Laemlaksakul used FEM to study the laminated bamboo chair static and dynamic performance, strength and durability [9] .LU Wei applied ANSYS to study the bamboo parallel grain tensile stress distribution, analyzed bamboo radian effects on stress with emphasis.
The comparison between experimental results and simulation results showed the validity of the model established. [10].To get wood horizontal grain fracture characteristics, Shao Zhuoping used finite element analysis to study the crack tip stress field [11] .Yu Huaqiang applied hot and humid analogy method to analyze bamboo & wood composite material surface and core performance [12].
Tab. 1 Calculation of model parameters number outer diameter (mm) axial length (mm) wall thickness (mm) experiment failure stress(MPa) simulation failure stress(MPa) error 1 90 129 21 62.8 64.1 2% 2 90 127 19 51 54.1 6% 3 90 102 15 68.6 71 3% As shown from Table 1, the model error is less than 6%, the nature of the axial compressive cracking can be expressed.
:Building mechanical properties of tensile strength parallel to the grain bamboo Test Method.

Electron-microscopic studies have established that up to 42% of the crests of copper in the waste slag of Mednogorsk MSCs are located inside the grains of man-made pyrite.
Thus, the analysis of the chemical, mineralogical, and grain compositions of the enrichment products suggests that they are active as a component of the charge in the processes of drying and the liquid-phase synthesis of a ceramic material under firing conditions.
Since the plasticity number of clay is 24.4, therefore, a more rational method was chosen – semi-dry pressing.
Malkova, Influence of technology features on the properties of fine-grained slag concrete, Samara, 2004, pp. 323– 327

This has been proved by a large number of studies on the geochemistry of island arcvolcanic rocks [1-4].
(a) (b) Fig. 2 The diagram of WEF-JD-AE of the omphacites from host rocks(a) and veins(b) [5] The analyses of a same omphcite grain with different points show that the compositions of the grain margin are slightly high in content of Na than those in the centre (Fig. 3), which indicates that the fluids are formed during progressive metamorphism.
Fig.3 The compositions of a same omphacite grain at different site The study of the origin of the fluids by electron microprobe analyses of the omphacites from HP-veins and host rocks suggested that the fluids flowing in deep subduction zone inside western Tianshan paleo-subduction zones are come from dehydration of the host rocks during progressive metamorphism.

Due to the presence of very strong covalent bonds, the high resistance to grain boundary sliding and absence of plasticity, densification of stoichiometric boron carbide (B4C) is extremely difficult.
Insufficient densification of the pure B4C sample sintered at 2160°C for 1 h is clearly seen in Fig. 7(a), with spherical particles and a large number of pores.
In the images, the rare-earth phase is dispersed uniformly in the fine grained matrix.
DyB4 was formed by in situ reaction between DAG, dysprosium titanate and B4C, where DyB4 particles were dispersed uniformly in the fine grained B4C matrix.