Search results

Introduction The pore system that penetrates the cement stone in mortars and concretes is the origin of a number of problems generally associated with such materials.
The concrete samples were prepared from a C 0.70 according to EN 1766 using 275 kg/m3 of CEM I 42.5 R and 1765 kg/m3 of a fine grained aggregate.
The former are approx. 10 times and the latter approx. 300 times weaker than charge-charge interactions [8], but the presence of a large number of HEMA molecules along the polymer chain, i.e. the cooperative effect, appears to provide in total a sufficiently large interfacial interaction to cause an increase in the mechanical parameters.

Compared to traditional insulating materials like organic foams and mineral wool, foam glass has a number of benefits, including superior mechanical qualities, large surface area and permeability, great chemical and thermal stability, resistance to water and steam, and tolerance to freeze-thaw cycles. [22] accounted that the applications for slags are more limited and new reuse applications for this material need to be developed Two main factors viz; the type of foaming agents and foaming temperature can determine the thermal insulation properties and structure of porous silicate materials; this is explained according to [23] that the main viscosity of the silicate mass exerts more influence on the foaming process, foaming agents are chosen based on their respective reactions to glass.
Mugoni et.at., [39] has used the heating microscope to investigate how the glass behaves during the thermal process, enabling the estimation of the characteristic temperatures at which a specific viscosity is associated with sintering (the grains begin to sinter), softening (the sample is plastic), sphere (the sample still has a surface tension that opposes the force of gravity), and hemisphere (the glassy material collapses).
The frequency of the particle size range is useful for evaluating the number of materials between two values and the percentage of particles above or below a defined value from the cumulative curve (Jakob et al. [40] posited that it is unavoidable that the particle size of materials changes after ball milling the mixtures to ensure homogeneity, hence obscuring a clear relationship between particle size and foam density.
Grain Size Distribution of Slags and Bottle glass Previous work of Jakob König et. al., [56] has reported that the granulometry of the materials used to produce glass foams plays a significant part in its properties, while [55] opined that the homogeneous particle size distribution of the raw components enhances the homogenous microstructure of the foam glasses.
Our essential task in the future is to reduce the impact of the human factor when preparing samples as much as possible and to perform our tests on a more significant number of samples.

A total of 32 specimens were tested, because of the limited number of specimens.
This processing resulted in an average grain size of 25µm and an average Vickers micro-hardness of 150 ±5.
The relatively simple and compact form of the constitutive models has also a number of practical advantages.

The quantitative success of Eq (3a) has been demonstrated for a number of systems [2].
A number of these reactions can be characterised as cellular “discontinuous precipitation” processes.
γ + xC → γD + Cr23C6 (12) In both carburisation reactions (11) and (12), a grain boundary forms between the parent alloy phase and the depleted matrix product.

Hence, Aspergillus total would be 10%. 2.6 Response surface optimization Response surface result and its analysis [5,6] By applying multipleregression analysis methods and the data shown in Table 2 analysed by Minitab15, the predicted response Y for reducing sugar content was obtained as (quadratic regression equation) Y1 = -56.2889 + 1.371442*X1 + 1.217996*X2 + 0.15729*X3 + 1.527521*X4 - 0.009175*X1*X1 - 0.000662*X1*X2 - 0.000588*X1*X3 - 0.007371*X1*X4 - 0.128017*X2*X2 - 0.014736*X2*X3 - 0.002575*X2*X4 - 0.007578*X3*X3 + 0.007678*X3*X4 - 0.052846*X4*X4 Table 2: Arrangement and results of the four-variable/three-level response surface central composite design Coded Design Run Coded Factor Values Response Values Number X1 X2 X3 X4 Y1 1 -1 -1 0 0 1.9698 2 -1 1 0 0 1.7498 3 1 -1 0 0 1.7589 4 1 1 0 0 1.5124 5 0 0 -1 -1 2.5225 6 0 0 -1 1 2.3070 7 0 0 1 -1 2.4915 8 0 0 1 1 2.5217 9 -1 0 0 -1 1.3590 10 -1 0 0 1 1.6432 11 1 0 0 -1 1.8610 12 1 0 0 1 1.5555 13
Acknowledgements This work was supported by the Spark Program of the Ministry of Science and Technology of the People's Republic of China Project Number 2008GA800015, the Science Planning Project of Haikou city (Supporting national projects funded).
Grain Processing Vol.34(2009), p.62～63 [8] J.D.

Contaminants appeared in oil in production process but during operating their number considerably increases [1].
Therefore the smaller number of abrasive particles were supplied to the friction contact zone and as the consequence wear decreased.
There were the following test parameters: - lubricating agent - SD SAE 20W/40 oil (kinematic viscosity 15 mm2/s at 373K, viscosity index   135), - contaminant - hard aluminium oxide powder (concentration in oil - 0,5 g/l, average diameter of   grains - 21 mm) , - journal diameter – 52.69 mm, - bearing length - 30 mm, - relative clearance ratio - 0.002, - journal angular velocity - 62.8 rad/s, - nominal contact pressure - 1.57 MPa, - total time of the test - 20 h.

The core idea of AOP is to a complex system as a combination by a number of concerns to implementation.
By intercepting the formation of the interceptor module, greatly improve the flexibility and reusability of system development, AOP proxy mode make the number of interceptors and the core business logic together, to meet user business needs, such a mechanism designed to overcome the traditional OOP thinking of all the disadvantages, which provides better solutions for the project development.
First, fine-grained permissions of intercept are blocking the function of the page which is accurate for a button or a link to have the authority verification.

The ESEM image also reveals that the particle packing is not always regular, and that defects and grain boundaries exist.
Yet, still a large number of latex particles have maintained their individual shape and did not coalesce into a latex film (Fig. 3d).
Chelation of cations on the surfaces of the latex results in an expanded hydrophilic shell which is mainly occupied by a large number of Ca2+ ions.

There is a linear dependence between the numbers of cycles to failure in the range of N up to 107 cycles (Fig. 2(b)).
Acknowledgements The financial support received from the Ministry of Education and Science, Russia, under Grant No. 14.578.21.0097 (ID number RFMEFI57814X0097) is gratefully acknowledged.
Lesuer, Grain refinement and superplastic behaviour of a modified 6061 aluminium alloy, Mater.

To the coal seam, its protodyaknove's number f is 0.92, its density is 1.46×103 kg/m3, and it belongs to the coal seam of low gas, no coal-dust explosion danger and spontaneous combustion tendency.
The false roof of coal seam is about 1 m thick mudstone; its direct roof is about 4 m thick sandy mudstone; its basical roof is about 11 m thick fine grain sandstone; the floor is about 25 m sandy mudstone.
By adopting millisecond blasting technology, have made firing numbers reduce, coal miner's shovelling coal amount and blaster's working time in the environment full of the mist and dust reduce, workers' working intensity reduce, and operation environment improve.