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A 6th-order local approximation by a cubic curve
(
Qatar University
, 1997 , Article)
We derive and present a MAPLE program for the construction of a parametric cubic polynomial curve which has sixth-order contract with a given smooth curve at a given point, thus providing a local sixth-order approximation ...
(−)-Paniculatol, a new ent-labdane bromoditerpene from Laurencia paniculata
(
Elsevier Science Ltd.
, 1997 , Article)
(−)-Paniculatol, 1, an unusual tricyclic bromoditerpene belonging to the ent-labdane series has been identified in the red alga Laurencia paniculata collected on Qatari coasts, Arabian Gulf. The structure displays an unusual ...
A Spreadsheet Teaching Tool For Analysis Of Pipe Networks
(
Qatar University
, 1997 , Article)
Spreadsheets are used widely in engineering to perform several analysis and design calculations. They are also very attractive as educational tools due to their flexibility and efficiency. This paper demonstrates the use ...
Fatty acid composition of twelve algae from the Coastal Zones of Qatar
(
Kluwer Academic Publishers
, 1997 , Article)
Fatty acid composition of twelve algal species from two different classes were determined. Three Chlorophyta species(Axetabularia calyxulux, Cladophors sericoides and Dictyosphaeria cavernosa) and nine Phaephyta species ...
عرض وتحليل بعض الجوانب التاريخيه لجامعة قطر 73/1974- 93/1994 مع اقتراح عناصر خطة عمل للتطوير المستقبلي
(
كلية التربية - جامعة عين شمس
, 1997 , Article)
جامعة قطر التي سنتحدث عن بعض تاريخها في هذه الدراسة قد بلغت اليوم مستويات من النمو في أعداد طلبتها وفي أعداد أعضاء هيئة التدريس، وفي كلياتها، وتخصصاتها وبرامجها الدراسية وأنشطتها العلمية والثقافية والرياضية والمجتمعية تفوق ...
Ground- and excited-state properties of some 3,4-dihydro-1-(2-p-substituted benzylidene)naphthalenones: substituent and environmental effects
(
John Wiley & Sons, Ltd.
, 1997 , Article)
Electronic absorption and steady-state fluorescence emission of seven 3,4-dihydro-1-(2-p-substituted benzylidene)naphthalenones (1–7) show sizable solvent dependence. The charge-transfer (CT) absorption maxima of these ...
Optical and electrical properties of a new polymer
(
John Wiley & Sons, Inc.
, 1997 , Article)
Thin film of poly (5-isopropylidenecyclo-1,4-vinylene-2,3-dicarboxylicacidamide-s-methyl hydrazinecarbodithioate) (II) (Scheme 1) of 5 μm thickness was prepared. The dielectric properties of the prepared sample were studied ...
Radon concentration determination in some dwellings of Doha city of Qatar
(
Elsevier
, 1997 , Article)
Yearly average radon concentrations have not been reported yet in Qatar. Only few measurements on indoor radon concentrations have been conducted during the autumn season in 1992. To complete these measurements a determination ...
Positron annihilation lifetime study of pure and treated polyvinyl chloride
(
scientific.net
, 1997 , Article)
Positron annihilation lifetime technique (PAL) has been applied to investigate the behavior of the free volume in pure and doped polyvinyl chloride (PVC) as a function of Pb concentration and temperature. It is noticed ...
Determination of glafenine in dosage forms and serum by thin layer densitometry and high performance liquid chromatography
(
Elsevier
, 1997 , Article)
New thin layer densitometry and high performance liquid chromatography (HPLC) methods are described for quantitative determination of glafenine in dosage forms in the presence of its photo-degradation products and in serum ...