Search results

These factors give an estimated idea of thermal heterogeneity impact on the cenospheres formation in flue ashes.
However there are of interest the factors influencing heat conductivity of the cenospheres layer.
This result, in our opinion, can be explained by such factors as distinction in cenospheres sizes and distinction of their chemical composition.
Effect of fly ash on properties evolution of cement based materials (2014) Construction and Building Materials, 69, pp. 32-40
Mechanical and durability properties of high volume fly ash (HVFA) concrete containing calcium carbonate (CaCO3) nanoparticles (2014) Construction and Building Materials, 70, pp 309-321

As affected by multi-factors, the apparent quality of fair-faced concrete did not reach a high level at present, which relied in a large extent on the transparent painting [3, 4].
Table 2 lists their main properties.
Table 3 lists the main properties of the crushed stone.
Fig. 4 lists the main properties of this sand.
[7] GB/T 50081-2002: Standard for Test Method of Mechanical Properties on Ordinary Concrete (China Building Industry Press, Beijing, 2002)

Materials and Methods of Research Softwood is used for bearing timber structures due to its good physical-mechanical properties and operation reliability.
It is necessary to take into account mechanical and elastic properties of reinforcement.
In this case, the joint strength depends on mechanical properties of glue and weaker material from the glued materials.
Chang: Nonlinear pre-yield modal properties of timber structures with large-diameter steel dowel connections.
Cruz: A review of factors influencing the durability of structural bonded timber joints.

Then the frequency of the low frequency oscillation is low, cycle to be longer,and affected area to be wide, it is also big harm to the power system.
Traditional mechanical phase shifter only can classification adjustment, and there are not many classifications.
The kinetic speed is very slow, and its life is short, and it has no ability to restrain the oscillation and improve the dynamic property of the system.
[3] Tang Zhi-da, “The influence factors in low frequency osillation” , Hujian Electric Power and Electrician, vol.26, no.4, pp.10-21, 2006
[4] Liu Chun-mei, “Study on influencing factors of low frequency oscillation of power system ” , Shanxi Electric Power, vol.20, no.11, pp.12-15, 2011

Zhao 3,c 1 School of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, PR China 2 School of Mechanical Engineering, Henan Polytechnic University, Jiaozuo 454000, PR China 3 School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200030, PR China a liq@hhuc.edu.cn, bzhaob@hpu.edu.cn, czhanjc@sjtu.edu.cn Keywords: Hydraulic engine mount (HEM), Structure parameter, Vibration isolation characteristic, Lumped parameter (LP) model, Frequency response characteristic Abstract.
Hydraulic engine mounts (HEMs) are important vibration isolation parts in vehicle powertrain mounting systems, and the structural parameters of HEMs are the main factors which determine their vibration isolation characteristics.
However the results in most studies on the dynamic properties of HEMs are not comparable because of their difference in their configurations.
It is necessary to do quantitative comparison based on the same structure, e.g., the same main rubber, the same upper and lower chamber and the same fluid, and elucidate the rule how the structural parameters of HEMs affect the vibration isolation of HEMs, and then provide a guiding principle for the HEM's selection and design.
Luo: China Mechanical.

The Effect of a Front Frame on the Increase in Sound Insulation of an Acoustically Simple Wall - Results of On-Site Measurements Dušan Dlhý1,a *, Peter Tomašovič2,b, Peter Petrák3,c and Peter Zaťko4,d 1,2 Slovak University of Technology in Bratislava, Faculty of Civil Engineering, Radlinskeho 11, 813 68 Bratislava, Slovak Republic 3 Slovak University of Technology in Bratislava, Faculty of Mechanical Engineering, Námestie Slobody 17, 812 31 Bratislava, Slovak Republic 4 A&Z Acoustics s.r.o., Repašského 2, 841 02 Bratislava, Slovakia adusan.dlhy@stuba.sk, bpeter.tomasovic@stuba.sk, cpeter.petrak@stuba.sk, dakustika@akustika.sk Keywords: Sound insulation, weighted sound insulation, the protruding wall insulation.
In relation to their mass, these constructions emit higher values of sound energy, which adversely affects airborne sound insulation.
Theoretical Change of Airborne Sound Insulation of Acoustically Simple Construction In the area of structure mass inertia (Fig. 1), the level of airborne sound insulation of a homogeneous wall depends on several mechanical and physical factors, but mainly on the basis weight of the structure and frequency.
Thus, at higher frequencies we can achieve better acoustic properties.

By analyzing fatigue tests, the acceptable stress concentration factors and S-N curves are suggested to be used to account for the fatigue behavior of RC beams strengthened with FRP laminates.
The extensive application of FRP in practice leads to research efforts on the comprehension of the properties of the materials.
The key factors that affect the reliability of this approach include the location of critical stress, stress concentration factors and S-N curves of loaded members.
Stress concentration factors Tests Stress concentration factors 1.
Zhang: Fatigue Behavior and Design Principle of Concrete Structure, Mechanical industry press, China, 2006

For controlling the functionality of the material and to prevent defects, information about the cation diffusivity, which controls most of the glass properties, are highly desirable.
The temperature dependence of the alkaline-earth diffusion with the corresponding activation energies and pre-exponential factors are given in Refs. [1, 3, 7].
As a consequence, the activation energy is mainly affected by Coulomb interactions.
Pre-exponential factor.
Hence the probability of successful barium diffusion jumps that affects the pre-exponential factor D0 increases with higher alkali concentration.

Introduction Titanium alloys, possessing the high strength-to-weight ratio due to the low density, the ability to retain high strength at high temperature up to 500oC, high heat resistance due to low thermal conductivity and high corrosion resistance, have wide applications in aerospace industry because of these unique properties.
Volume fraction of primary alpha phase is also an important factor to determine the machinability of a titanium alloy because of its correlation with the strength [3].
The volume fraction and morphology of these phases which depend on the heat treatment temperature determine the deformation behavior and mechanical properties of this alloy under both quasi-static and dynamic loading conditions [4-7].
The contribution of each factor changes with increase in cutting speed.
Summary (1) Microstructure of Ti-6Al-4V alloy affects the cutting force and chip formation only at cutting speed lower than 100m/min.

In the process of equipment operation under the action of overpressure, mechanical loads, thermal stress and other factors there comes accumulation of fatigue damage to buildings and metal structural elements that leads to adverse processes resulting in serious failures which negatively affect industrial fire safety.
Currently, to estimate the ruggedness of structural elements, to evaluate the health of long-operated technological equipment and to extend the lifecycle of equipment with the designated period of safe operation, the methods are implemented that do not take into account real changes in the structure and mechanical properties of structural materials in operation.
To assess real changes in the mechanical properties of constructional materials and their structure and to determine the actual technical condition and the remaining safe life of structural elements of processing equipment an electromagnetic-acoustical (EMA) method is proposed to be used.
In accordance with the results, it was proposed to use the transfer function of the system "unit under test – electromagnetic-acoustical transducer” in order to give an integrated assessment of changes in mechanical, acoustical and electrophysical properties of metal samples in the process of changing a strain-stress state and damage accumulation.
It was proposed to use a transfer function of the system "unit under test – electromagnetic- acoustical transducer" to assess the change of mechanical, acoustical and electrical properties of metal samples when changing the stress-strain state and damage accumulation.