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السجلات المعروضة 21 -- 30 من 661
Preparation and infrared spectra of (Cu(O)(H2O)3) and (Cu2(O) (C1)2(H2O)2) complexes formed in the reactions of Cu(II) salts with urea
(
Elsevier
, 1989 , Article)
The preparation and characterization of the new solid complexes (Cu(O)(H2O)3) and (Cu2(O)(Cl)2(H2O)2) formed in the reaction of urea with CuSO4 · 5H2O and CuCl2 · 2H2O, respectively, in aqueous media at ~75°C are reported. ...
Resonance Raman and far infrared spectroscopic studies of triiodide complexes formed in the reaction of iodine with some polycyclic amines
(
Elsevier
, 1989 , Article)
The solid charge transfer complexes formed in the reaction of iodine with the polycyclic amines 1,4,8,12-tetraazacyclopentadecane (TACPD) and meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (HMTACTD) have ...
Resonance Raman studies of the peroxotitanate(IV) complexes K2(Ti(O2)(SO4)2).5H2O and K2(Ti(O2)(C2O4)2).3H2O
(
Elsevier
, 1986 , Article)
The resonance Raman spectra of K2(Ti(O2)(SO4)2)·5H2O and K2(Ti(O2)(C2O4)2)·3H2O are recorded. The results are consistent with the triangular structure of the peroxotitanium unit, Ti(O2), with C2ν symmetry. The ν(OO), ...
Resonance Raman and far-infrared studies of charge-transfer complexes of iodine
(
John Wiley and Sons Inc
, 1986 , Article)
The reactions of I2 with phenazine (PH), acridine (AC) and hexamethylenetetramine (HMTA) have been investigated by resonance Raman and far-infrared spectroscopy. The results indicate that the species (PH)2I+I3−, (AC)2I+I3− ...
Vibrational analysis of the trigonal bipyramidal NbCl5 and NbBr5 molecules
(
Elsevier
, 1986 , Article)
Vibrational normal coordinate analysis has been made for NbCl5 and NbBr5 molecules with D3h symmetry and using Wilson's GF matrix method. The observed frequencies are quantitatively assigned on the basis of the calculated ...
التربية في مرحلة الطفولة المبكرة
(
Qatar University
, 1985 , Article)
نظرية ريبيرا حول عروبة الأندلس
(
Qatar University
, 1989 , Article)
Hydrography Of The Western Part Of The Arabian Gulf
(
Qatar University
, 1986 , Article)
The hydrographic conditions in the western part of the Gulf, from Kuwait to UAE, were studied. Water temperature, salinity, sigma T and water masses were determined for two cruises. The first cruise was carried out from ...
Flow and Fracture Behaviour of Tungsten Fiber Reinforced Superalloy Composites-Effect Of Specimen Geometry
(
Qatar University
, 1989 , Article)
The influence of aspect ratio (i.e. width to height ratio) of test specimens on the flow and fracture behaviour of fiber reinforced composites is herein examined. The composite material was prepared by isostatic pressing ...
السنة بيان الله تعالى على لسان رسوله صلى الله عليه وسلم
(
Qatar University
, 1988 , Article)