Vol. 6 Issue 2
Adnan Al-Aqeel
In this paper, the integrability conditions of f(5,1)-structure satisfying f5-f=0, where f is a non-null tensor field of type (1,1), are obtained. Besides this, a condition of complete integrability is presented.
O.H. Cheikh and M. Oudadess
It is shown that the condition ||xy||≤ α ||yx|| for all x and y, α being a positive constant, does not imply commutativity in nonunital complex Banach Algebras. Other results, concerning the structure of certain Banach algebras satisfying this condition are obtained
A. Essawy, A.M. El-Gendy, M. El-Safty and S.A. Said
3-Benzyl-5-(Carboxy or Carbethoxy)- methylthio-1,2,4-triazole (1a &b) have been prepared. (1a) was cyclized to give 6-benzylthiazole(3.2-b)-s-triazol-3(2H)-one(II). The reaction of the active methylene of compound (II) with aromatic aldehydes and/or arene diazonium salts gave the corresponding 2-arylidene-6-benzylthiazolo(3,2-b)-s-triazol-3(2H)-one derivatives (III a-c) and 2,3-dihydro-6-benzylthiazolo-(3,2-b)-s-triazol-2,3-dione-2-arylhydrazone (IV a-c). Also, hydrazinolysis of compound (Ib) and its condensation with aromatic aldehydes have been studied and gave (V a & b) and (VI a & b) respectively
H.I. Emara and K.Z. El Deeb
Sea water samples collected from the southern part o the Gulf during September 1985 showed that, according to the standard used, the concentration of petroleum hydrocarbons is variable. The variations in the results for the references: Kuwait crude oil, Qatar crude oil (from Dukhan and Halul Island) and chrysene standards are usually in an average ratio of 1:1.26:2.6:1.51 respectively.
The concentration of dissolved petroleum hydrocarbons varied from 7.7 µ l^-1 to 32 µ l^-1 during September 1985. High levels (69-373 µ l^-1 were recorded around the beaches of Halul island indicating oil contamination. The total concentration of petroleum hydrocarbons dissolved i the Gulf waters was found to be 406 x 10^3 ton which is 2.7 times as higher as the estimates of oil pollution in the Gulf area during 1985. Dissolved oxygen levels decrease with increasing the concentrations of petroleum hydrocarbons (r=-0.55)
Mohamed I. El Samra
Salinity and nutrient species were measured in the Arabian Gulf and the Gulf of Oman during the period 1984-1986. Statistical analysis in the results showed clearly three distinct types of seawater in the area. First is the proper water of the Arabian Gulf with salinity ≥ 40%, silicate from 2.6 to 9.3 µmole l^-1, phosphate 0.14 ± 0.02 µmole l^-1 and nitrate 0.21 ± 0.02 µmole l^-1. Second is the seawater of the Gulf of Oman with salinity ≤ 37%, silicate 3.1 ± 0.3 µmole l^-1, phosphate 0.47 ± 0.05 µmole l^-1 and nitrate 0.41 ± 0.05 µmole l^-1. Third is a mixed water, which has intermediate values of the measured elements. The calculated ratios P:N:Si indicate the nitrogen in the Arabian Gulf.
Talal A.K. Al-Allaf, Ihsan A. Mustafa, and Saad E. Al-Mukhtar
The proton and carbon-13 NMR spectra for a number of mono- and N, N'-Di-substituted thioureas; RNHC(S)NHR', R ≠ R' or R = R' = H, ethyl, cyclohexyl, phenyl and 1-naphthyl and some analogous ureas; RNHC(O)NHR' (or comparison), have been recorded. Substituent effects (R and R') on the 1H chemical shifts for H-NR (or R') group of the N, N'-disubstituted thiourea were elucidated. Determination of 1H data for EtNHC(S)NHPh in a range of solvents reveals from the ẟ value of H-NEt and H-NPh is almost always shifted downfield as the donor number (DN) of the solvent increases.
The 13C chemical shifts of carbon atoms for 1-naphthyl group (those other than C-1, C-9 and C-10 were deduced by comparison with known 1-substituted naphthalene. Solvent effects on 13C chemical shifts for some thiourea compounds were also checked by changing from donor solvent (DMSO-d6) to inert solvent (CDCl3)
Hassan Othman Sindi
Geological and hydrogeochemical studies were carried out on 60 km2 in Al-Quwayiyah area that consists mainly of igneous and metamorphic rocks. The former group includes extrusive and intrusive rocks of different ages and assorted compositions ranging from calc-calkaline to strongly alkaline affinities. The latter sequence has, at least, four metamorphic phases containing foliated and non-foliated rocks of ortho and para origins. They have N-S strikes with eastern dip to vertical foliation. The area suffers major and minor structures and shear zones where some Phanerozoic sedimentary cover also occurs.
Ten shallow hand-dug water wells exist in Wadi Al-Faydhiyah in Al-Quwayiyah zone with depths of 20-40 m. The groundwater is of a reasonably good quality for all uses, although its quality changes downstream due to the extensive pumping in the drought seasons and becomes more mineralized. Regional geology with cross sections and other shallow wells in different areas from this zone were studied for comparison
H. Sofrata
This paper presents a new graphical method for designing air conditioning heat exchangers. This method is fast, simple and accurate. It gives a direct solution utilizing only the psychometric chart. It gives also a direct determination of the boundary temperature at which dehumidification begins for that type of that type of problem where a portion of the surface is in a dry condition.
In order to verify the developed technique an experimental test rig was installed. The data were collected for a heat exchanger, which consist mainly of a standard four-row integral fin tube coil. The coil was fitted in an experimental wind tunnel allowing facilities of measuring and varying the main operating variables and conditions which bear effects on cooling coil performance. The test results show a good agreement with the predicted ones, and the average deviation for the total heat is about +15% and for sensible heat is +9%, which are of positive nature and on the safe side for practical design purpose. The method is useful for similar practical applications
Adnan A. Al-Samawi and Jawad S. Hassan
Stepwise regression procedure is used to estimate residential water demand in each house as a function of number of fitments, number of occupants, area lot price, and tap water pressure using cross-sectionally metered readings from 50 households in Basrah, Iraq, between January 1977 and February, 1978. A methodological approach is used that provides unbiased estimate of parameters and standard errors, Demand relations are estimated for total residential, summer, winter and sprinkling demands. Sprinkling use per day per customer for a year is estimated by subtracting winter consumption from summer consumption.
The number of fitments per dwelling variable explained the largest proportion of the variation in the data in all demand models. Results are reported herein.
M.A. Gomaa And A. Hasiesh
Thermoluminescence (TL) response of some Jizan soil to γ rays was studied. Experimental results indicated that highest TL response belongs to fine grain sandy soil samples and lowest TL response is observed for sandy soil samples contaminated with silt. Furthermore, TL response was found to vary linearly with the square root of (silicium-dioxide content to the sum of aluminium oxide plus iron oxide contents) in the sandy soil samples. Relative response of Jizan sandy soil samples to TLD-700 crystal is found to vary from 1.8 x 10^-2 down to 7.3 x 10^3