The study was carried out in apple orchard and at the laboratories of Agricultural
Scientific Research Center, and Pome and Grapevine Division in Sweida (GCSAR),
Syria, during the growing seasons of 2015 and 2016 to study the effect of organic
res
idues, and boron and zinc addition on some soil characters, fruit set ratio and
some fruits qualitative traits in Starking delicious apple cultivar in Sweida.
In this work, multi-layer thin films (insulator - metal - insulator) were prepared on glass substrates. Where we deposited the following order of (zinc oxide - silver - zinc oxide) by magnetron sputtering of zinc oxide and vacuum thermal evaporation technique for silver.
In this work the electrochemical behavior of Para-nitro aniline
and metoxy benzealdehyde was studied by cyclic voltammetric
method on glassy carbon electrode in alkaline medium . It was
found that the Para- nitro aniline needed five electrons to reduce to
the azo group.
This research aims to study the effect of adding alloying elements and heat treatment
of Zinc metal on solar energy absorbing , nine alloys ingots were manufactured by
changing the percentages of added Aluminum and Copper on the pure Zinc, and thes
e
ratios of Aluminum were : (10% , 20% , 30% , 40 % , 50%) to demonstrate the effect of
adding Aluminum to Zinc metal on solar energy absorbing , and ratios of copper were :
(20% , 40%) , as well as we prepare two pure zinc samples with 99.2% of purity , one
was rapidly cooled and the other slowly cooled , to demonstrate the effect of heat treatment
on solar energy absorbing .
In order to measure the solar energy absorbing for prepared samples , we
manufactured a device depends on the methods of heat exchange between solar radiation
and the surface exposed to radiation .
The obtained results showed that adding Aluminum and Copper to the pure Zinc
caused a decrease in solar energy absorbing .
As well as increasing the percentages of adding Aluminum and Copper to the pure
Zinc caused a gradually decrease in solar energy absorbing .
comparing the absorbing of pure zinc samples, one was rapidly cooled and the other
slowly cooled , the results showed that the sample was rapidly cooled was better than the
sample slowly cooled on solar energy absorbing .
Zinc Chromate was synthesised by Co-precipitation
method, The synthesised samples were characterized using
X-ray powder diffraction technology (XRD).
Set temperature synthesis at 250 ℃ .
Our research aims to prepare ZnFe2O4 system by
CO-precipitation method in aqueous solution,starting from the
raw materials, and then studying its structure and properties .After
finishing the preparation period, we divided the precipitate in two
parts , and then we added to one of them the hydrogen peroxide and
then we dried every part alone, grind it and then we heated it at
various temperatures for two hours .
This study has been conducted to identify the levels of heavy
metals (lead, cadmium, nickel, cobalt, copper, iron, manganese, and
zinc) in the following spices: Nutmeg, turmeric, cinnamon, ginger,
cardamom, nigella sativa, black pepper, cumin, coriander, curry,
and mixed spices.
this research aimed to study the ability of both reeds (Phragmites communis) and
poplar trees (Populus nigra) to accumulate Cd and Zn. Where speared naturally prevail on
the sides of the Rumaila River in Jableh town (research site), during 2014-201
5. Average
amount of Cd on studied site was 3.081 ppm dry weight. Compared with the normal range
of soil content from Cd (0.06-1.1 ppm), we found that it is three times the normal upper
limit, indicating site contamination with Cd. The study showed that the Cd concentration in
the reed shoots was 0.031 ppm, while it was up to 0.055 ppm in leaves than that of shoots.
The value of bio-accumulation factor (BF) was 0.014. Also for poplar, the study revealed
predominance of leaves over bark with Cd concentration of 0.034 ppm versus 0.016 ppm
for poplar bark. BF value was 0.02. Regarding average amount of Zn in the soil of studied
site was recorded 116.61 ppm of dry weight. Compared with average range of Zn in
different types of soil (40-100 ppm), we find that it is slightly higher than the normal upper
limit, showing site contamination with Zn. The study stated that the Zn concentration in
reed leaves was 9.05 ppm versus 8.03 in the shoots. BF value was 0.07. Zn concentration
in poplar leaves was the lowest at 5.13 ppm versus 6.07 ppm for the bark. We notice from
these findings that the Zn amount in the parts of poplar plant is approximate. BF value was
0.05. The statistical analysis showed significant superiority of reed to poplar in terms of Cd
accumulation, and the same for Zn.
This research aims to study the effect of adding Zinc Borate and
Aluminum Hydroxide as flame retardants to Low Density
polyethylene.
Specimens have been prepared through pouring them in a mold.
Results have revealed that replacement of certain am
ount of
Aluminum Hydroxide with Zinc Borate could lead to improving the
resistance of flame spread in Low Density polyethylene.
these improvements were basically due to further contribution of
Zinc Borate to the physical barrier mechanism of Aluminum
Hydroxide in both gas and solid phases.
We studying in this research the reaction with Zinc sulphate in an
aqueous solution by physical - chemical method in presence of
Succinic Acid , and determined compounds which are formed in
this solution and we calculated of it formation the const
ants.
After we used these electrolytes in plating by Zinc , that is by
electro precipitation of this metal on the solid electrodes (steel,
copper) so that we definite the best of these electrolytes for galvany
and the set necessary conditions for its use.
