Chemistry & Earth Sciences: المرسلات الحديثة
السجلات المعروضة 521 -- 540 من 614
-
Evidence by ac-conductivity for the higher mobility of boron (over aluminium)-associated Brønsted sites in boron-modified HZSM-5
( Elsevier , 1996 , Article)A correlation ac-conductivity analysis is performed at 102–105 Hz, 373–613 K and 0.8 V for characterizing the effect of increasing boron incorporation in HZSM-5 lattice on altered electric features in BZSM-5 samples of ... -
Alpha-glucosidase and carbonic anhydrase inhibition studies of Pd(II)-hydrazide complexes
( Elsevier , 2017 , Article)This study focused on the synthesis and characterization of hydrazide ligands and their respective Pd(II) complexes and used high throughput screening to determine their α-glucosidase and carbonic anhydrase II enzyme ... -
Evaluation of pesticide residues of organochlorine in vegetables and fruits in Qatar: statistical analysis
( Springer Verlag , 2016 , Article)The study aimed to examine the residues of organochlorines pesticides (OCPs) in vegetables and fruits in Qatar. A total of 127 samples was studied. Ninety percent of the imported samples recorded residues above the maximum ... -
Review on Synthesis, Characterizations, and Electrochemical Properties of Cathode Materials for Lithium Ion Batteries
( OMICS International , 2016 , Article)The development of cutting-edge cathode materials is a challenging research topic aiming to improve the energy and power densities of lithium ion batteries (LIB) to cover the increasing demands for energy storage devices. ... -
Activation and stabilization of gallium arsenide anode in an aqueous photoelectrochemical cell
( Elsevier B.V. , 2003 , Article)The formation of a porous layer on the surface of gallium arsenide anode, n-GaAs, increases photogenerated currents significantly. This layer was formed as a result of an anodic polarization of illuminated n-GaAs in acidified ... -
Prevention of gallium arsenide photocorrosion by an epoxy adhesion layer
( Elsevier Ltd , 2004 , Article)Coating of gallium arsenide with an adhesion layer of commercial epoxy prevented its photocorrosion. A two-component room temperature curing adhesive paste (Araldite 2014) has been selected. When GaAs/Araldite was employed ... -
Synthesis, characterization and spectroscopic structural studies of charge-transfer complexes of 1,4,8,11-tetraazacyclotetradecane-5,7-dione with iodine, TCNE and DDQ
( Elsevier B.V. , 2010 , Article)Three novel aqueous and solid charge-transfer complexes are synthesized by the reaction of the polynitrogen cyclic n-donor 1,4,8,11-tetraazacyclotetradecane-5,7-dione (TACTDD) with the σ-acceptor iodine, the aliphatic ... -
Computational study on oxynitride perovskites for CO2 photoreduction
( Elsevier Ltd , 2016 , Article)The photocatalytic conversion of CO2 into chemical fuels is an attractive route for recycling this greenhouse gas. However, the large scale application of such approach is limited by the low selectivity and activity of the ... -
Photocatalytic degradation of methyl orange as a model compound
( Elsevier , 2002 , Article)Titanium dioxide (TiO2) was used as a photocatalyst for the detoxification of water containing methyl orange (MO), which was used as a model compound. Solar radiation was used as an irradiation source. It was found that ... -
Synthesis, spectroscopic and thermal studies of the reactions of the donors piperazine and N,N′-dimethylpiperazine with σ- and π-acceptors
( Elsevier , 2008 , Article)Abstract The interactions of the electron donors piperazine (PIP) and N,N′-dimethylpiperazine (DMPIP) with the σ-acceptor iodine and the π-acceptors tetracyanoethylene (TCNE) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone ... -
Synthesis, spectroscopic and thermal studies of charge-transfer molecular complexes formed in the reaction of 1,4-bis (3-aminopropyl) piperazine with σ- and π acceptors
( Elsevier , 2012 , Article)Abstract In the present study, solid charge-transfer (CT) molecular complexes formed in the reaction of the electron donor 1,4-bis (3-aminopropyl) piperazine (APPIP) with the σ-electron acceptor iodine and π-acceptors ... -
Rapid microwave assisted sol-gel synthesis of CeO2 and CexSm1-xO2 nanoparticle catalysts for CO oxidation
( Elsevier , 2016 , Article)CeO2 and CexSm1-xO2 nanoparticle mixed oxides have been synthesized by microwave assisted sol-gel (MW sol-gel) and conventional sol-gel synthesis carried out at 60°C (typical sol-gel) and 100°C (approaching the MW temperature). ... -
Spectroscopic investigation of the charge-transfer interactions between 1,4,7-trimethyl-1,4,7-triazacyclononane and the acceptors iodine, TCNE, TCNQ and chloranil
( Elsevier , 2007 , Article)The interaction of the interesting polynitrogen cyclic base 1,4,7-trimethyl-1,4,7-triazacyclononane (TMTACN) with the σ-acceptor iodine and π-acceptors tetracyanoethylene (TCNE), 7,7,8,8-tetracyanoquinodimethane (TCNQ) and ... -
Relationship of plant proteins and amino acids within taxonomic categories in Qatari range plants
( Asian Publication Corporation , 2005 , Article)Protein and amino acids of sixty-eight range plants growing wild in Qatar belonging to fifty-six genera and twenty-three families are studied to evaluate their nutritive values -
Constituents of Plants Growing in Qatar XXXIII Proximate composition of thirty four food and feed plants growing in Qatar
(2003 , Article)34 wild species within 32 genera belonging to 14 families from the flora of Qatar were analyzed for their moisture, lipids, carbohydrate, protein, crude fiber and ash content -
Synthesis and spectroscopic structural studies of the adducts formed in the reaction of aminopyridines with TCNQ
( Elsevier , 2006 , Article)The adducts 7,7-dicyano-8,8-di-m-aminopyridilequinodimethane and 7,7-dicyano-8,8-di-p-aminopyridilequinodimethane are formed by the reaction of the electron donors 3-aminopyridine (3APY) and 4-aminopyridine (4APY), ... -
Fatty acids composition of Fifty-one plant species growing in Qatar
(2004 , Article)Fatty acids and lipids composition of fifty one species growing in Qatar belonging to twenty one families and forty three genera are reported -
Charge-transfer complexes formed in the reaction of 2-amino-4-ethylpyridine with π-electron acceptors
( Elsevier , 2016 , Article)Molecular charge-transfer complexes (CT) of electron donor 2-amino-4-ethylpyridine (2A4EPy) with π-acceptors tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and 2,4,4,6-tetrabromo-2,5-cyclohexadienone ... -
Charge-transfer complexes formed in the reaction of 1,4,7,10-tetraazacyclododecane with π-electron acceptors
( Elsevier , 2013 , Article)The reactions of the electron donor 1,4,7,10-tetraazacyclododecane (TACDD) with the π-electron acceptors 7,7,8,8-tetracyanoquinodimethane (TCNQ), tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), ... -
Synthesis and spectroscopic structural investigations of the charge-transfer complexes formed in the reaction of 2,6-diaminopyridine with π-acceptors TCNE, chloranil, and DDQ
( Elsevier , 2007 , Article)Molecular charge-transfer complexes of the donor 2,6-diaminopyridine (2,6-DAPY) with π-acceptors tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) and tetrachloro-p-benzoquinone(chloranil) were studied ...
