Search results

This is due to the fact that, in these techniques, molecular precursors react directly onto the substrate through a number of coupled processes towards the desired film.
The technique is optimized in terms of a number of parameters that include deposition temperature ant time, solution flowrate and precursor concentrations and substrate distance from the nozzle.
This is expected as precipitating particles formed after thermolysis within the droplet are quite reactive leading to microporous particulates of small grain size, and thus, requiring low sintering temperatures for further densification.
Acknowledgements Financial support from the Special Research Account Committee of the University of Western Macedonia (Grant number: 70305) is acknowledged.

The oxidation experiments on the FeCrAl alloys were carried out at 1373 and in some cases at 1273 K, in air, in both isothermal and thermal cycling conditions, the weight changes being measured as a function of the exposure period or a number of 1h-cycles, respectively.
Subsequent rapid increase of the mass after the initial few cycles corresponds to the intensive material destruction. 0 5 10 15 -20 -10 0 10 20 30 40 50 WEIGHT CHANGE [mg / cm**2] NUMBER OF 1h-CYCLES Fe10Cr Fe10Cr+imp.
The following can be inferred from these plots : (i) the Fe-10Cr alloy exhibited catastrophic oxidation, independently of the presence of the implanted Al, which did not considerably affect the reaction course; (ii) the oxidation rates 0 10 20 30 40 50 -1,5 -1,0 -0,5 0,0 0,5 1,0 1,5 WEIGHT CHANGE [mg / cm**2] NUMBER OF 1h-CYCLES Fe20Cr-2Al Fe20Cr-2Al+imp.
However, the extent of nodules was much smaller on the Fe-10Cr-2Al alloy than on the Fe-20Cr one; (v) the surface of the oxidised non-implanted Fe-10Cr-2Al alloy was reddish, while it was white in the prevailing part on Al-implanted material; (vi) large areas of the spallation were found on the Fe-20Cr-2Al alloy and even larger on the Al-implanted material; (vii) in the latter case, the exposed substrate degraded in terms of fairly deep cracks which resulted in its 'fine-grained' appearance.

DaYuXian for pure hakka county, in the hakka dialect words, keep heavy ChuYuan culture, in the new time construction upsurge, combined with the local characteristics to create a batch of reflect landscape culture, hakka culture and the cultural spirit of culture's development grain.
Plant variety has introduced a large number of African species, one of them is not suitable for the local characteristics, a large number of death; Some other species breeding too fast, destroyed the species flow and biological flow.
Fourth, greening structure should be divided into node core afforest, lane and sidewalk boundary greening, purify air number of wood green block and some piece of greening level.

Table 1 Chemical compositon of choosen materials Material C Mn Si P S Ni Cr Mo V Ti S355 NL +N 0.172 1.38 0.36 0.016 0.002 0.08 0.021 0.004 0.003 0.024 34CrMo4 0.34 0.81 0.26 0.009 0.005 - 1.01 0.21 - 316 LVM 0.03 2.0 1.0 0.025 0.01 13-15.5 17-19 2.5-3.2 - Table 2 Basic mechanical properties of choosen materials Material Rm [MPa] Rp02 [MPa] A5[%] KCV [J/cm^2] S355 NL +N 566 405 36 131 34CrMo4 1107 1053 12 93 316 LVM 950 770 13 88 From the metallographic point of view, first material is fine-grained ferritic - pearlitic structure.
Numbers of indents is small but sufficient for description of standard hardness of unknown specimens[5].
According to EN standard is writen 100 HV10, where 100 is hardness number, HV is method and is a applied force in kgf.
That is because hardness number is mainly force against to area (N/mm2 = [MPa]).[2, 4, 10] Results Results bellow are mentioned in table 3, were are writen mean, and other statistical values of measuremnents.

This is due to the formation of dispersed phase for nitrides, complex carbides, carbonitrides, and intermetallic compounds, which reinforce grain boundaries, and limit diffusion permeability.
Another essential disadvantage of the materials obtained under gas pressure is the loss of valuable products, both small and large particles, in a large number of concentrated slag.
Selected exothermic mixtures, numbered as L-1 and L-2, have the following compositions: L-1 – MnO2 : Fe3O4 : B2O3 : CaF2 : Al = 60.8 : 9.5 : 3.0 : 3.5 : 32.0 / 70.0 g Mn and L-2 – MnO2 : Fe3O4 : B2O3 : CaF2 : Al = 62.0 : 9.5 : 1.8 : 3.5 : 32.0 / 70.0 g Mn.
The corrosion resistance of complex alloys numbered L-1 and L-2 obtained in the Fe–Mn–B system is determined to be 0.70072 and 0.16276 mm/y, respectively, which are durable according to the class standard.

In this study, based on a large number of experimental explorations, we analyzed the impact of film-forming factors to the film properties, and filtered out the optimal experimental conditions which could make the self-assembled monolayer to achieve the most good overall performance.We attempted to study the metal surface chemical adsorption film technology in the acidic environment by using the methyl trimethoxysilane (silane coupling agent), polyethylene glycol(400), glycerol, triethanolamine and chromium alum as the main raw material.
Through a large number of preliminary experiments we initially identified the film process conditions: polyethylene glycol (400) was 20mL/L, silane coupling agent was 15mL/L, triethanolamine was 70mL/L, glycerol was 20mL/L, chrome alum was 1g/L, pH was 2, and coating time was 8min.
Fig.1 showed that the phosphate film by this phosphating process formation was stacked close needle-like crystals, and the grain was small, uniform, dense.
Summary Through a large number of experiments we had come to a technology of metal surface chemical adsorption film: polyethylene glycol (400) was 20mL/L, silane coupling agent was 15mL/L, triethanolamine was 70mL/L, glycerol was 20mL/L, chromium alum was 1g/L, pH value was 2, coating time was 8min.

Milling is employed to obtain a fine-grained powder with controlled reactivity and rheological properties in the cement paste.
The powder processed with increasing number of milling steps showed a reduction of the crystalline content from 79 ± 1 wt-% (once 15 minutes milling) to 29 ± 1 wt-% (15 times 15 minutes milling, Fig. 1).
Increasing the number of milling steps not only increased the amorphous content prior to calcination, but also accelerated the transformation of α-TCP to β-TCP.
Datasets of samples milled 2, 4, and 10 times showed characteristics in between the two extreme samples, i.e. faster decrease of α-TCP and increase of β-TCP contents, as well as an increasing amount of HA were observed for higher numbers of milling steps.

Introduction A sensor node might vary in size from that of a shoebox down to the size of a grain of dust, although functioning “motes” of genuine microscopic dimensions have yet to be created.
There are a number of standardization bodies in the field of WSN.
There are an increasing number of small companies producing WSN hardware and the commercial situation can be compared to home computing in the 1970s.
WSN are meant to be deployed in large numbers in various environments, including remote and hostile regions, where ad hoc communications are a key component.

A number of methods have been used for mine drainage treatment including precipitation [3], electrochemical remediation [4], oxidation and hydrolysis[5], neutralization[6], ion exchange and solvent extraction[7], ion exchange and precipitation [8], titration[9], biosorption [10], adsorption [11], reverse osmosis [12].
First, the mordenitem was crushed and screened to be making the 20-40 mesh, 40-60 mesh, 60-80 mesh, 80-100 mesh, 100-120 mesh as several grain ranks being offered for the experiment.
The selectivity of Na-zeolite to cations is not only with the structure of zelite, but also with the ionic radius, charge number, hydration and so on [21].
In theory, the four cations have the same charge number, so the exchange of Na+ in Na-zeolite is basically decided by the enthalpy of hydration and ionic radius of the cation.

Introduction Carbon nanotubes (CNTs) materials are well known as to their unique shape; rolled graphene sheets with a large number of hilicities and chiralities of graphene sheet rolled up like a scroll [1].
The catalyst was grained small before calcined in oven at 900 ºC for 10 hrs.
Fourier transform infrared (FTIR) spectra of the samples were performed in a scan range wave number of 4000-500 cm-1 with a resolution of 2 cm-1 at room temperature.
Samples N Tensile strength (MPa) Tensile Strain (%) Tensile Modulus (MPa) PDMS 5 7.137 ± 0.579 159.300 ± 10.6 8.396 ± 0.403 0.5 wt% PDMS/MWCNT- Al2O3 5 2.657 ± 0.773 102.700 ± 7.2 6.252 ± 1.152 1.0 wt% PDMS/MWCNT- Al2O3 5 2.014 ± 0.610 93.700 ± 17.3 5.027 ± 1.465 1.5 wt% PDMS/MWCNT- Al2O3 5 1.649 ±0.086 128.500 ± 8.5 2.555 ± 1.390 (N = number of samples) Conclusion The influence of processing on the properties of multiwalled carbon nanotubes/alumina hybrid compound filled PDMS composites was investigated.