Search
Now showing items 51-60 of 105
Constituents of plants growing in qatar xxiii. Flavonoids of francoeuria crispa
(
Qatar University
, 1993 , Article)
Investigation of the flavonoid constituents of Francoeuria crispa, resulted in the isolation and identification of four flavonoids: quercetin, qucrcetin-3-O-gIucoside, quercetin-7-0-glucoside and quercetin-3-methyl ether.
Thermogravimetry and infrared spectroscopy Of Moroccan oil shales in an oxidative Dynamic atmosphere
(
Qatar University
, 1994 , Article)
Thermogravimetric analyses were carried out on raw Timahdit (Morocco) oil shales and its demineralisation products in an oxidative atmosphere. The kerogen was isolated by successive HCl, HF and float-sink separation ...
Evaluation of Electron Swarm Parameters in SF6 Using Monte Carlo Method
(
Qatar University
, 2005 , Article)
The motion of electrons in sulfur hexafluoride (SFo) in uniform electric fields is simulated using a Monte Carlo method. The swarm parameters are evaluated and compared with experimental results of drift velocity, electron ...
Constituents Of Green Beans Phaseolus Vulgaris (Lipids And Flavonoids)
(
Qatar University
, 1992 , Article)
Chemical study of the lipid fraction resulted in the isolation and identification of a hydrocarbon fraction (n-Czg -0-033); an aliphatic alcohol fraction (C^, Czp, €30) and a sterol fraction (stigmasterol and sitosterol). ...
Synthesis And Biological Activity Of Some New 4-(Aminoacyl) Aminopyridines And 2-(Aminoacyl) Aminopyrimidine Derivatives
(
Qatar University
, 1983 , Article)
The synthesis of 4-(N-Tos and N-Pht-aminoacyI) aminopyridines (III - XIV) and 2-(N-Pht-aminoacyl)-aminopyriniidines (XV-XXIV) has been achieved employing the acid chloride and carbodiimide methods. Hydrazinolysis of ...
Mechanism of Dehydration of Ethanol over Alumina
(
Qatar University
, 1981 , Article)
The dehydration reaction of ethanol to ether and ethylene was kinetically investigated in a flow system using •y-alumina. Pyridine was found to inhibit the formation of ethylene and ether. The rate of ethylene formation ...
ENHANCING PRODUCED WATER QUALITY USING MODIFIED ACTIVATED CARBON
(2016 , Master Thesis)
The formation produced water from natural gas production process in the North field offshore considered largest volume of waste water in Qatar, which could be considered a potential benefits source for the industry as well ...
Heat Absorbers based on Recycled Polyethylene and Paraffin Wax for Energy Storage
(2016 , Master Thesis)
The building sector is one of the main sectors in Qatar; however, it consumes a huge portion of primary energy sources. Today, there is a worldwide trend to utilize renewable sources of energy to cover buildings’ energetic ...
Analytical Studies Of Some Controlled And Noncontrolled Drugs Of Abuse (II)
(
Qatar University
, 1993 , Article)
Benzodiazepines, barbiturates, amphetamines and some other non-controlled drugs were identified by GLC and HPLC then confirmed by GC-MS techniques. Comparative studies and discussions on the results obtained by GLC and ...
Facile synthesis of several new pyridine and fused pyridine derivatives with Anticipated biological activity
(
Qatar University
, 1994 , Article)
The reactions of benzothiazol-2-N-acetylacetohydrazide 1 with a, (}-unsaturated aldehyde, ketone, ester or diketoester led to the formation of the titled ring systems. The same target was also achieved through the reactions ...