بحث بسيط
السجلات المعروضة 41 -- 50 من 68
Guaianolides from Picris radicata
(
Elsevier Science Ltd.
, 1996 , Article)
The methylene chloride-methanol (1:1) extract of the aerial parts of Picris radicata Forssk afforded two new guaianolides. The structures were established from spectral data.
REMOTE MONITORING AND CONTROL OF MICROCOMPUTER RAISED DATA ACQUISITION SYSTEMS
(
Blackwell Publishing Ltd
, 1994 , Article)
Metathesis ring opening polymerization of 5,6-dimethylenebicyclo[2.2.1]hept-2-ene
(
John Wiley & Sons, Ltd
, 1992 , Article)
5,6-Dimethylenebicyclo[2.2.1]hept-2-ene (I) polymerizes in the presence of the two-component ring opening metathesis polymerization (ROMP) initiators WCl6/(CH3)4Sn and MoCl5/(CH3)4Sn. The product polymers were insoluble ...
Use of Mathcad as a teaching and learning tool for reinforced concrete design of footings
(
John Wiley & Sons, Inc.
, 1999 , Article)
Owing to their nature, numerous and complex equations are commonly used in the design of reinforced concrete structures. This is because of the nature of reinforced concrete design. Mathcad, which possesses efficient ...
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 ...
Thermal dimensional stability of isotropic polyoxymethylene
(
John Wiley & Sons, Ltd.
, 1991 , Article)
A parametric mapping analysis of the effect of various structural and morphological parameters on the thermal dimensional stability of polyoxymethylene is highlighted. The molecular composites model is found to describe ...
Vegetation composition of a maritime salt marsh in Qatar in relation to edaphic features
(
Blackwell Publishing Ltd
, 1990 , Article)
Coverpercentage values for plant species were estimated using the line-intercept method along two belt transects starting at the lower mangrove frontier and ending at the upper height of the salt marsh. Twelve perennial ...
Speed control of induction motor without rotational transducers
(
IEEE
, 1999 , Article)
This paper describes a newly developed speed sensorless drive based on neural networks. A backpropagation neural network is used to provide real-time adaptive identification of the motor speed. The estimation objective is ...
Purification and characterization of an extracellular phenol oxidase from culture filtrates of Pyricularia oryzae
(
NRC Research Press
, 1996 , Article)
Extracellular phenol oxidase activity was characterized and compared in Pyricularia oryzae wild-type and albino cell types to determine if this phenol oxidase was responsible for lack of melanization in the albino culture. ...
Inhibitive Effect of Butyltin Trichloride on Dissolution and Localized Corrosion of Aluminium in Sodium Hydroxide and Hydrochloric Acid
(
WILEY-VCH Verlag
, 1990 , Article)
The dissolution of aluminium in sodium hydroxide and hydrochloric acid in the presence of butyltin trichloride as corrosion inhibitor has been studied by hydrogen evolution and thermometric methods. Experimental findings ...