In this research we studied and measured the response and absorbance for some metals (zinc, copper, iron, aluminum) which are exposed to the direct light and painted with black, which has a high absorbance and low emittance, and with different thickn
esses (to obtain black bodies) with higher absorption. we took the measurement on the painted metals for each thickness of the paint in the laboratory first using tow lamps 30 watt and 100 watt to compare the absorption of these metals of the radiation from these two lamps with the absorption of the solar radiation and make sure that the absorption is similar of the two situations, then we took the measurements in AL- Kadmous Area which is 900m above sea level using direct solar radiation , and we found the relationship between the absorbance and the paint thickness.
In this research improve the conditions determining zinc(II) using the method of
optical spectroscopy based on the formation of a complex with BPT when the wavelength
(430nm) and through the study of the impact of degrees pH the middle, and the eff
ect of
the interference caused by the presence of some of the nickel ions, iron(II) , calcium,
copper, chromium, and manganese that hinder the process of identifying zinc-mediated this
reagent .
In this research we present results of the studying and calculating the optically active
range depth for diffuse light reflected coating at change of the dispersiveness of pigment
grains used in coating and wavelength of incident electromagnetic ra
diation. This coating
consists of zinc oxide powder and organic material that acts as a binding film. The size of
zinc oxide powder grains were changed between 0.2 μm and 10 μm. In addition, the depths
of optically active range of diffuse light reflected coating were calculated when the
absorption coefficient of the pigment used in the ZnO/binder coating changed between
-1 0.1cm and -1 1000cm . The obtained results allow us optimization of the diffuse light
reflecting coatings thickness at preparation determined kinds of them.
In this study, we have investigated the water absorption behavior of unsaturated
polyester /wood flour wastes composites materials. To achieve that, specimens were
prepared by using compressing method with different ratio of polymer matrix with org
anic
wastes produced from carpentry workshop (wood flour).Density of produced panels has
been measured and the obtained results showed that there is an ability to produce
hardindustrial wood panels. Practical experiments had been achieved to determine the
percentages of water absorption. Absorption test was achieved on the cut specimens by
immersing them in natural water (un-distilled) and measuring the gained weight of
specimens and the resulted swelling to determine the final changes in the product. Through
this study, we find that the absorbability has increased with the increment of organic filler
ratio and the practices sizes increment. In addition, we also find that the absorption
behavior follow Fickian law of diffusion in most specimens. We calculated the diffusion
coefficient D and other parameters of diffusion process and we also plotted the associated
plotsof the absorbability results. The obtained results showed that there is an ability to
produce planes of industrial wood without any pretreatment of wood flour.
The nanocrystals of semi-conductive metal oxides attracted great attention because of their interesting properties. Therefore, our study of some physical properties of the pure and Sb doping Tin Oxide compound. The measurement of the infrared spectru
m of pure tin oxide compound shows vibrational frequencies which has two energy (415.585, 574.683) cm-1 and the Sb doping Tin Oxide with a rate of (4wt%) shows vibration frequencies and the most prominent is which has two energy (417.513, 669.178) cm-1. the study showed that the largest value of the absorbance, absorption coefficient was in the sample Sb doping Tin Oxide compound respectively are A=0.7560, α=17.389 cm-1, at the vibrational frequency 3447.13 cm-1, and the refractive index for pure tin oxide ranged from (1.832 - 2.371). As for the Sb doping Tin Oxide compound, the refractive index value was between (1.709-2.643).
