Browsing by Title
Now showing items 998-1017 of 1084
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Syntheses and structural characterization of 2,4,6-trimethylaniline complexes of iron carbonyls
(Inorganica Chimica Acta, 2014)The new 2,4,6-trimethylaniline complexes [Cp∗Fe(CO)2(NH2C6H2(CH3)3)]+ (3) and [CpFe(CO)2(NH2C6H2(CH3)3)]+ (4) (Cp∗ = η5-C5(CH3)5; Cp = η5-C5H5) have been synthesized and isolated in high yields as tetrafluoroborate salts. ... -
Syntheses, structural elucidation and reactions of allylamino compounds of the type, [η5-C5R5(CO)2Fe(NH2CH2CHCH2)]BF4
(Pergamon, 2012)The reaction of 3-aminoprop-1-ene (allylamine) with the etherate complexes [(n5-C5R5)(CO)2Fe(L)]+(R = H; L = Et2O; R = CH3; L = THF) have been investigated and found to give air stable allylamino com-plexes [(n5-C5R5)(CO ... -
Synthesis and Characterization of Macrocyclic Polyether N, N′-Diallyl-7, 16-diaza-1, 4, 10, 13-tetraoxa-dibenzo-18-crown-6
(Multidisciplinary Digital Publishing Institute, 2016)In this study an efficient and direct production procedure for a macrocyclic polyether N,N 1 diallyl-7,16-diaza-1,4,10,13 -tetraoxa-dibenzo-18-crown-6 from the reaction of catechol and N,Nbis (2-chloroethyl)prop-2-en-1-amine ... -
Synthesis and characterization of Y2O3:Eu3+ phosphors using the Sol-Combustion method.
(Elsevier B.V., 2014)Y2O3: Eu3+ phosphor powders were prepared by the Sol-Combustion synthesis method using a sulfur-contained organic fuel in an ethanol–aqueous solution. The structural, morphological and optical properties of the as-prepared ... -
Synthesis, characterization and crystal structures of two polymorphs of the iodo-bridged ruthenium salt, μ-iodido-bis {η 5-cyclopentadienyl-dicarbonyl-ruthenium (II)} tetrafluoroborate
(Elsevier, 2013)The reaction of RpI (Rp = (η5-C5H5)Ru(CO)2) and AgBF4 in two different solvents, tetrahydrofuran and dichloromethane afforded two polymorphs of the iodo-bridged cationic complex [Rp2I]BF4. Polymorph I precipitates out of ... -
Synthesis, characterization and structural elucidation of water-soluble 1-aminoalkane and α, ω-diaminoalkane complexes of the pentamethylcyclopentadienyliron dicarbonyl cation,[Cp∗(CO) 2 Fe]+
(Elsevier, 2012)A series of water-soluble alkylaminopentamethylcyclopentadienyliron dicarbonyl complexes, [Cp∗(CO)2Fe{NH2(CH2)nCH3}]BF4 (n = 2–6; Cp∗ = η5-C5Me5) and the diaminopropane bridged complex, [{Cp∗(CO)2Fe}2{μ-NH2(CH2)3NH2}](BF4)2 ... -
Synthesis, characterization and structural elucidation of water-soluble 1-aminoalkane and α,ω-diaminoalkane complexes of the pentamethylcyclopentadienyliron dicarbonyl cation, [Cp∗(CO)2Fe]+
(Elsevier, 2012)A series of water-soluble alkylaminopentamethylcyclopentadienyliron dicarbonyl complexes, [Cp ∗ (CO) 2 Fe{NH 2 (CH 2 ) n CH 3 }]BF 4 (n=2–6; Cp ∗ =η 5 -C 5 Me 5 ) and the diaminopropane bridged complex, [{Cp ∗ (CO) 2 Fe} ... -
Teacher training pathways for competency based curriculum (CBC) in the university education in Kenya
(Meru University of Science and Technology, 2022-06)The education reform in Kenya recommended phasing out of the 8-4-4 education system to embrace the 2-6-3-3-3 competency based curriculum (CBC). The embraced curriculum has three learning pathways or pillars at senior ... -
Technical and scale efficiency of public community hospitals in Eritrea: an exploratory study
(Springer Berlin Heidelberg, 2014)Eritrean gross national income of Int$610 per capita is lower than the average for Africa (Int$1620) and considerably lower than the global average (Int$6977). It is therefore imperative that the country’s resources,including ... -
Technical efficiency of primary health units in Kailahun and Kenema districts of Sierra Leone
(BioMed Central, 2011)The objectives of the study reported in this paper were to (i) estimate the technical efficiency of samples of community health centres (CHCs), community health posts (CHPs) and maternal and child health posts (MCHPs) in ... -
Technological Preferences, Levels of Utilization and Attitude of Students Towards Mobile Learning Technologies in Chartered Universities, Kenya
(International Journal of Education & Literacy, 2017)The affordances of mobile technologies are being felt in many sectors of world’s economy including university education. By solving the limitations of fixed instructional technologies, mobile technologies have received ... -
The Technology Acceptance Model (TAM) and its Application to the Utilization of Mobile Learning Technologies
(SCIENCEDOMAIN international, 2017)Researchers have argued that inclusion of technologies in the teaching-learning places must be preceded by the user accepting the technology. Without this effort, the technologies remain abandoned or heavily ... -
The Technology Acceptance Model (TAM) and its Application to the Utilization of Mobile Learning Technologies
(Br. J. Math. Comput. Sci, 2017)Researchers have argued that inclusion of technologies in the teaching-learning places must be preceded by the user accepting the technology. Without this effort, the technologies remain abandoned or heavily underutilized ... -
Teenage Girls and Television Advertisements: The Reaction of Teenage Girls to Persuasion in Advertisements
(Lambert Academic Publishing, 2012)The book the reaction of teenage girls to TV advertisements looks at the language of persuasion in television adverts and looks at how the teenage girls react to it. The adverts do more than just sell the products they ... -
Temperature dependence of structural and luminescence properties of Eu3+-doped Y2O3 red-emitting phosphor thin films by pulsed laser deposition.
(Springer, 2016-02)Pulse laser deposition was used to obtain nanocrystalline red-emitting Y2O3:Eu3+ thin-film phosphors.X-ray diffraction measurements show that the un-annealed thin film was amorphous, while those annealed were crystalline.At ... -
A Theoretical Model of Corruption Using Modified Lotka Volterra Model: A Perspective of Interactions between Staff and Students
(Journal of Advances in Mathematics and Computer Science, 2020)Corruption is the misuse of power or resources for private gain. This undermines economic development, political stability, and government legitimacy, the society fabric, allocation of resources to sectors crucial for ... -
Thermal Resistivity of Chemically Activated Calcined Clays-Based Cements
(Springer, 2017)The study investigated the effects of selected potential chemical activators on thermal resistivity of calcined clay based cement mortars. 0.5 M Na2SO4 and 0.5 M NaOH were used as activator solutions. The chemical composition ... -
Thermal Stress Monitoring on Piston Rings by Real Time Holographic Interferometry
(Scientific Research Publishing, 2013)In this paper, real time holographic Interferometry (RTHI) technique was used to monitor the thermal stress on the piston rings. The piston rings holograms were recorded and the holographic plate replaced on the holder ... -
To assess the Impact of land use change on nutrients flow and to establish the level of key pollutants of Nyangores River
(Nile Basin Water Science & Engineering Journal, 2015)This study was carried out with the aim of assessing the effect of Riparian land use/ land cover change on the hydrology and water quality of the upper Mara River catchment specifically Nyangores River. The study incorporated ... -
To Third Generation Cephalosporins among Multi Drug Resistant Klebsiella Pneumoniae in Nairobi, Kenya.
(2016)This study focused on the prevalence molecular biology of extended-spectrum beta-lactamase (ESBL)-positive Klebsiella pneumoniae isolates. Extended-spectrum beta-lactamase (ESBL)-producing strains of Klebsiella pneumoniae ...