Kirkuk Journal of Science

This study has been carried out on six samples of local and imported cement to determine concentrations
of Rn-222 and U-238. The study showed that the minimum concentration of both Rn-222 and U-238 was
in the cement of Hamam- AL Aleel with 17.9kBq.m-3
( 15.93 Bq.kg-1
) and 1.29 ppm respectively, while the
maximum concentration was in the Turkish cement with 60.3kBq.m-3
( 53.6 Bq.kg-1
) and 4.342 ppm
respectively. The obtained results were within the range of the allowed values and have no influence on
the health and environment.

In this paper an experimental work has been conducted to investigate the influence of heating the lower
half and cooling the upper half of vertical surface of a rectangular enclosure on natural convection. The
enclosure length is (100 cm) with a square cross section (10×10 cm). The tests are done for three mass flow
rates (0, 0.003 and 0.03 kg/sec) and five heat fluxes (48, 187, 400, 706 and 1080 W/m2
). The hottest region
formed is observed at (

= 0.67) where the lowest Nux is found while the coldest region is observed at (

=
0.33) where the highest Nux is found. Increasing the water mass flow rate enhances the heat transfer. The
same thing happens with increasing the heat flux. A correlation is found to relate Nu with Ra (Nu= 0.216
Ra1/4) for (4×105
≤Ra≤4×106
). Both the experimental results and the correlation found are compared with a
previous work and fair agreement is found.

The study of collision and coalescence mechanism for water droplets in cloud has a large importance
because its represented major process in formation rain in warm clouds .
In this study the, the relationship between the efficiency of coalescence (
Ecoa
) and the radius of droplets
in warm clouds had been studied by taking different radius of large droplets (
R
) ranged between
(60 to 100
m
) with groups of small droplets (
r
) that has radius ranged by (5 to 20
m
) because these
values represented nearly the range of radius of droplets occurred in warm clouds .
The results appears that coalescence efficiency proportional directly with the radius of large droplet and
inversely proportional with radius of small droplet.

New series of N1
-Benzyl -6-(thio derivatives) Uracils have been prepared by reaction of 6-chloro uracil [F3]
with benzyl chloride in dimethyl sulphoxide in presence of sodium carbonate to yield N1
-Benzyl-6-chloro
uracil [F4].Heating of [F4] in ethanol with thiourea and treated with sodium carbonate to yield N1
-benzyl6-marcapto uracil [F5].Alkylation's of compound [F5] with different reagents a new series of uracils were
prepared (F7 –F17) .The structures of synthesized compounds were elucidated by using some
spectroscopic methods (IR, 1HNMR).

Research has included the preparation of compounds of acetylenic mercpto uracil compounds. And for
the preparation of these derivatives requests 4 - chloro uracil (1) and can be obtained (1) easily from the
reaction of 2,4,6 - trichloro Pyrimidin with a mixture of diethyl aniline and phosphorus oxide, trichloro
POCl3, after it has been obtained for compound 4 - Mercpto uracil (2) of the reactant compound (1) Thio
urea and reflux the mix in the presence of ethanol and then were treated compound (2)with Propagel
bromide to obtain a compound (3) 4 - Propyl thiouracil. On the other reactant compound has (1) with a
solution of Mercpto acetic acid (SHCH2COOH) in Sodium hydroxide to obtain compound (5) 2,6 -
Dihydroxy-4-pyrimidinyl thio acetic acid and then were treated compound (5) with Propagel alcohol to get
propaynyl (2,6-dihydroxy-4-pyrimidinyl thio acetate) (6). and for the preparation of Mannich reaction ,
Acetylenic compounds (3) and (6) were treated with paraformaldehyde in Isopropyl alcohol and the
mixture was heated a bit, then added Secondary amine with Copper chloride with continuous heating to
obtain derivatives 4a-e and 7a-e.
The purpose of the preparation of these derivatives is to get a new uracil derivatives containing acetylenic
amines possible to have a biological effectiveness.

In this study 780 gravity measurements were conducted in the Tawke area along the paved and
accessible unpaved roads. The obtained gravity data was subjected to the necessary corrections and
analyses qualitatively and quantitatively. For that purpose the Bouguer anomaly map was transformed
analytically to regional and residual fields. Moreover two profiles trending NS were limited to a 2-D
gravity models. The main structural features of the studied area as are recognized utilizing two main
lines of evidence, namely, geological map and geophysical interpretations have one distinctive trend; it is
the E-W Taurus trend. The Bouguer map of the Tawke area shows gravity high in the central part. It
trends E-W. It is indicative of the main anticline. Two gravity lows indicating the two synclines bounding
the structure from north and south are clearly shown. Six faults are inferred from gravity data. When
inferred faults and gravity lows and highs are plotted on the geological map they show good agreement.
A considerable density contrast of 0.36 gm/cm3 was observed between the Jeribe, Ana, Pila Spi, and
Avana formation group against Lower Bakhtiari, Upper Fars and Lower Fars formation group and used
in the modeling of two profiles. One main positive and two negative features characterize these profiles.
The positive anomaly represents Tawke Anticline, the south negative anomaly represents Khabore
syncline and the other Zakho syncline.
Geological model for profiles show that the Tawke Anticline is an asymmetrical Anticline producing a
structural trap by tilting of the Miocene formations comprising sealing rocks (Fatha Formation) and
reservoir rock represented by the Jeribe carbonates. Two small faults on the northern limb of Tawke
Anticline have indications on the surface as seepages of oil.

In this paper, we propose a new class of Quasi- Newton update based on the non monotone line search
technique for solving non linear equation under suitable conditions the global convergence of the method
is proved. Numerical experiments indicate that this new algorithm is practicable for the test problems.