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السجلات المعروضة 21 -- 30 من 30
Effects of herbicide and timing of removal on interference between barley and weeds
(
Blackwell Publishing Ltd
, 1988 , Article)
Field experiments were done during the rainy season of 1984�85 and 1985�86 at Harma, Qatar. A weed survey of barley fields was conducted with the primary purpose of identifying the weed vegetation present. The effects of ...
Diffusion of saturated hydrocarbons in low density polyethylene (LDPE) films
(
Wiley Subscription Services, Inc.
, 1989 , Article)
The diffusion coefficients at zero penetrant concentration, D0, of n-heptane, n-heptane, n-octane, n-decane, and 2,2,4-trimethylpentane (TMP) in LDPE were obtained in the range of 25–50°C, using the desorption method. The ...
Substituted phenols as corrosion inhibitors for copper in nitric acid
(
WILEY-VCH Verlag GmbH
, 1988 , Article)
The dissolution of copper in nitric acid solution in the presence of resorcinol, o, p-aminophenols, catechol, o-cresol and salicylaldehyde as corrosion inhibitors has been studied by galvanostatic polarization and weight ...
Mössbauer effect study of Li21+Me4+Fe63+O122−spinels
(
Baltzer Science Publishers, Baarn/Kluwer Academic Publishers
, 1986 , Article)
Mossbauer effect spectra are obtained for the cubic ferrites Li2 Me Fe6 O12 (where Me4+ is one of the tetravalent elements Ge, Si and Ti) at 78K up to their magnetic transition temperatures. In a rather large temperature ...
On the Valence State of Iron in Sr0.52+Ca0.52+Fe0.54+ Me0.54+O32−
(
WILEY-VCH Verlag GmbH & Co.
, 1989 , Article)
Powder samples of Sr0.5Ca0.5Fe0.5Me0.5O3 (Me = Co, Zr or Mn) and Sr0.3La0.7FeO3 are investigated by X-ray diffraction and Mossbauer effect spectroscopy.
Analysis of the completely ordered spectra suggested three kinds ...
Ventifacts distribution in Qatar
(
John Wiley & Sons, Ltd
, 1985 , Article)
This study attempts to investigate the distribution of ventifacts in Qatar. It is believed that ventifacts are confined to the areas within about 5 km of the Miocene or Mio-Pliocene Hofuf formations and the spreads of ...
INDIRECT PRESSURE MEASUREMENT FOR FUNCTIONALLY INACCESSIBLE VESSELS
(
Blackwell Publishing Ltd
, 1989 , Article)
Distribution and ultrastructure of neurosecretory cells in the cerebral ganglion of the earthworm
(
Wiley Subscription Services, Inc., A Wiley Company
, 1988 , Article)
Neurosecretory (Nsy) cells within the cerebral ganglion of Lumbricus terrestris were classified ultrastructurally. The Nsy cells within the subesophageal ganglion, nerve cord ganglion, and the peripheral nervous system ...
Synthesis and biological activity of some new aminoacylcarbazole derivatives. Part I
(
Wiley-Blackwell
, 1982 , Article)
The syntheses of different 9-(N-phthalyl- or N-tosyl- or free aminoacyl)carbazoles and the corresponding derivatives of 3,6-dinitrocarbazoles and some derivatives of 3,6-diamino-9-(N-phthalylaminoacyl)carbazoles (II-XXXII) ...
M-Profile ray tracing technique for multipath propagation
(
IET
, 1987 , Article)
A model for the modified refractivity is suggested and used in a new and simple ray tracing approach for multipath propagation. The technique is then used to study the variations in ray path parameters for different path ...