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In addition, many factors affect the control of air bubbles production, such as speed, time and mixing directions.
Pectinase treatments on technical fibres of flax: Effects on water sorption and mechanical properties.
Properties and applications of foamed concrete; a review.
Properties of foamed concrete containing water repellents.
Properties of foamed concrete as influenced by air-void parameters.

The first group is adhesive properties and conditions of an adhesive bond creation.
The adhesive properties can be influenced e.g. by an unsuitable storing.
Although both above stated groups of influences exert mechanical properties of adhesive bonds (their strength above all) in a complex it is important to review partially each particular factor in a form of laboratory experiments, also with a respect for a particular type of the adhesive [3, 4, 5, 6].
Technological and constructional aspects affecting bonded joints.
Comparative study on the adhesive properties of different epoxy resins.

Experimental Investigation on Uniaxial Tensile Properties of Steel Fiber Reinforced Concrete Yining Ding 1, a, Yingchao Yan 1,b 1 State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, China aynding@hotmail.com, byanyingchaosxdt@163.com Keywords: Uniaxial Tensile Behaviour, Concrete, Steel Fiber, Ductility.
The test results showed that steel fiber can improve the tensile property effectively.
To date, some direct tensile tests of plain concrete and steel fiber reinforced concrete (SFRC) have been reported[1-6], and based on these studies, mechanical characterization was performed in this paper by means of uniaxial tension tests with the aim of observing the first crack strength, the ductility indexes and the load-displacement curves.
Table 3 Average mechanical factors of concrete in direct tension Group of concrete Strain at peak load Tensile strength ft [Mpa] Equivalent tensile strength feq,1[ Mpa] Equivalent tensile strength feq,2[ Mpa] Equivalent tensile strength feq,3[ Mpa] SF20 140.54 3.30 1.13 0.92 0.72 SF40 154.12 3.32 1.47 1.27 1.07 SF60 185.03 3.39 1.91 1.64 1.43 SF80 206.30 3.41 2.46 2.14 1.72 Conclusion The present experimental analysis was carried out in order to investigate SFRC mechanical behaviour with respect to different fiber content.
The experimental results of this study have led to the following conclusions: Uniaxial compressive tests showed how the compressive strength of the material is less affected by the presence of fibers.

The prospects of the use of this type of supports to improve the dynamic characteristics of rotating machinery, including reducing vibrations caused by various factors, are analyzed.
In fluid film bearings and gas lubricated bearings reactions depend primarily on the size and the profile of the gap between the rotor and the bearing, lubricant properties (viscosity, density), and, in case of hydro- or aerostatic principle of creating load capacity, on the pressure with which the lubricant is delivered to the friction area.
In most cases, the results of mathematical modeling of the rotor dynamics on such bearings, as well as the results of experimental studies, show an improvement in the dynamic properties of rotor-bearing system with active control.
At the same time, often the limiting factor in the development and use of active bearings is hardware components of the control system.
Valves used to control the pressure have moving mechanical elements that cause the servo system to have inertia properties. 

On this basis, calculation error of steel ball speed is modified, and impact angle, structure parameters, material parameters and other factors get analyzed by numeric simulation.
This having very important significance provides theoretic basis to optimize structure of re-circulating mechanism and improve properties of ball screw.
Numeric Simulation of All Impact Factors Reducing the impact force of ball to return tube is a important method to improve property of ball screw.
Seen from model stated before, there are many influence factors, such as velocity, material parameters, structural parameters, etc.
Above-mentioned factors are respectively discussed by numeric simulation.

For mud drilling, the mainly influence factors of well deviation can be divided into two types of geological factors and drill factors.
Geological factors include formation anisotropy, formation dip angle, layer structure, fault and so on.
Drill factors mean drill bit tilt because of tool inclination and flexion, resulting in asymmetric cutting in bottom hole.
The stress state of rock and breakage properties present a big variation due to the alteration of bottom hole peripheral pressure.
Cuttings cushion is formed with the results of particles detached which affect the mechanical properties of BHA.

On the basis of unloading rock mass theory, we identify the excavated rock mass parameters by means of neural network training in each step, in which the subjective factors of the parameters selected process have largely been decreased.
Literature [8] uses BP-ANN to simulate the relationship between rock mass displacements and rock mechanical parameters, and additionally, optimize the initial input weights of BP-ANN model by genetic algorithm because they strongly affect the accuracy of neural network.
Mechanical Parameters.
Mechanical Parameters.
Fig.4 Displacement comparison of Mcf0+000-8 Conclusion On the basis of unloading rock mass theory, referring to the two-and three dimensional finite calculations, the inversion analysis process has the following properties: (1) Considering the slope displacements as the final outputs, the deformation parameters are picked up for the main variables which can be adjusted according to the engineering situation

Furthermore, the most critical area of the joint was identified to be the weld interface, i.e. the area between the nugget and the thermo-mechanically affected zone. 1.
The most important reason for this difference seems to be the evolution of residual stresses around the welded area, while the microstructure and material property changes and the developed distortions due to the welding operation have been proved to be less dominant.
The applied minimum and maximum load values have been appropriately selected in order to lead to an initial stress intensity factor range value of about 7MPa√m.
c) The weld interface, namely the interface between the weld nugget and the thermo-mechanical affected zone, seems to be the most susceptible area of the weld for crack initiation and fast crack propagation.
REFERENCES [1] Cavaliere, P. , Santis, A. , Panella, F. and Squillace, A. (2009) Effect of anisotropy on fatigue properties of 2198 Al-Li plates joined by friction stir welding.

The increasing hydration level has an effect on various physical properties of hydrated biomolecules.
The zeta potential of an implanted material is an index of the electric properties of its surface [67].
Surface roughness, surface features characteristics (size, geometry, distribution) and surface energy are three factors that depend on each other, and they all interact and affect the reaction of the surrounding environment.
Unfortunately, it is not possible to alter one surface property without affecting the others and it is also difficult to distinguish which modification is responsible for each tissue reactions.
It can be concluded surface modifications can alter more than one of surface properties and those changes affect the subsequent reactions of the surface with the surrounding environment.

Introduction Different methods of severe plastic deformation are currently widely used in practice to obtain metals with improved physical and mechanical properties (for example, such processes as equal channel angular pressing, extrusion, rolling and their various combinations or modifications).
Therefore, there is increasingly more need for constructing mathematical models allowing to describe as integral characteristics of material processing as material internal structure evolution, which has an influence on physical and mechanical properties.
The explicit internal variables of macrolevel model are spin of movable coordinate system Ω, effective anisotropic elastic properties П, inelastic and thermal components of the strain rate tensor.
Hardening Laws One of the key factors determining the material behavior is the change of critical shear stress for the intragranular slip systems in the process of deformation that is determined by the equation (27) in mesolevel of the two-level constitutive model (1)-(2).
The oriented hardening is considered due to the annihilation of dislocations “compressed” at the barriers, while changing the direction of deformation, as well as due to the interaction of intragranular dislocations with grain boundaries in case of polycrystal deformation, that is why the physics of the annihilation process and the factors affecting the decrease of the critical shear stress on the considered slip system as the result of the annihilation of dislocations were thoroughly investigated.