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Search Results: 1 - 10 of 490020 matches for " M.F. Salman "
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Effect of Two Psychological Techniques in Improving Academic Performance of Secondary School Students in Mathematics
M.F. Salman,M.O. Esere,J.A. Omotosho,O.E. Abdullahi,S.O. Oniyangi
Journal of Modern Mathematics and Statistics , 2012, DOI: 10.3923/jmmstat.2010.96.100
Abstract: Poor academic performance of students in mathematics has been of great concern to educationists, researchers, parents and teachers and calls for a concerted effort at remediation. To determine the efficacy of goal-setting and cognitive restructuring in improving the academic performance of secondary school students in mathematics. The design was a pre-test, post-test control group quasi-experimental design. The sample consisted of 120 students aged 15-18 years purposively sampled from a randomly selected co-educational public secondary school in Ilorin metropolis. Participants were randomly assigned to three experimental groups: Cognitive restructuring (treatment groups) and Control programme (placebo). A validated Mathematics Ability Test (MAT) was administered to the three groups before and after the experimental programme which was packaged into 8 weekly workshop sessions. Analysis of covariance with Scheffe post-hoc measure were employed for the data analysis. When the treatment group was compared with the control group in an attempt to treat analysis, there were significant differences in the mathematics performance ability of the three groups. Those in the treatment groups reported improved mathematics performance ability than their counterparts in the control group. Lack of behavioural effect on the control group could be linked to differential quality of delivery of intervention. The treatment gain was however not mediated by participants gender. Both male and female students benefited maximally from the intervention programmes. The result is an indication that students mathematical ability can be improved using psychological strategies and these should be factored in secondary school mathematics curriculum.
Vasorelaxant Properties of Loranthus ferrugineus Roxb. Methanolic Extract
O.Z. Ameer,I.M. Salman,M.F. Yam,H.H. Abd Allah
International Journal of Pharmacology , 2009,
Abstract: In the present study, Loranthus ferrugineus was evaluated for blood pressure lowering activity using in vitro and in vivo animal experimental approaches. The fresh aerial parts of the plant were dried, pulverized into powder and successively extracted with petroleum ether, chloroform, ethyl acetate, methanol and water using hot extraction methods. Each of the extracts was dried under reduced pressure using rotary evaporator and subsequently freeze-dried. The effects of three different concentrations (0.5, 1 and 2 mg mL-1 of each extract were examined on isolated rat aortic ring preparations and responses to cumulative doses of noradrenaline (NA) were measured. It was found that the relatively polar methanol extract was the most potent to produce a significant (p<0.05) dose-dependent inhibition in the maximum response and to shift the dose-response curve of NA to the right which suggests that Loranthus ferrugineus methanolic extract (LFME) contains compound(s) with non-competitive inhibitory activity. In another set of experiments, LFME was found to be the most active in blood pressure lowering activity in anesthetized normotensive Sprague Dawley (SD) rat model. Moreover, LFME produced a dose-dependent blood pressure lowering effect. Chemical analysis of LFME showed the presence of significant amounts of polyphenolic and flavonoid constituents. The data suggests that LFME contains some biologically active substances that produce a significant dose-dependent blood pressure lowering effect and vasodilatation is one of the possible mechanisms which may explain its use in the management of hypertension. Furthermore, LFME effects can possibly be attributed to the high polyphenolic contents of this plant.
Vascular Responsiveness to Macrosolen cochinchinensis Extracts inIsolated Rat Thoracic Aorta
O.Z. Ameer,I.M. Salman,Md. J.A. Siddiqui,M.F. Yam
International Journal of Pharmacology , 2009,
Abstract: The aim of the current investigation was to examine the vascular responsiveness to different extracts obtained from M. cochinchinensis using isolated Sprague Dawley (SD) rat aortic rings preparations. The fresh aerial parts of the plant were dried, pulverized into powder and sequentially extracted with petroleum ether, chloroform, methanol and water using hot extraction method. The effects of three concentrations (0.5, 1 and 2 mg mL-1) of each extract on rat thoracic aorta were tested using cumulative concentrations of noradrenaline (NA). The data showed that all the extracts had the ability to relax vascular smooth muscle; however, high concentrations of the methanol and water extracts caused the most significant (p<0.05) reduction in NA-induced vasoconstriction as compared to petroleum ether and chloroform extracts. Polyphenolic content, HPLC profiling and IR spectra were indicative of the presence of diterpenoid constituents. The results collectively suggested the presence of some biologically active ingredients of possible diterpenoid nature that have the ability to modulate the action of naturally occurring vasoactive agents such as NA on vascular smooth muscle responses in vitro.
Leaching of a gold bearing partially roasted sulphide. Laboratory scale studies
Almeida, M.F.;
Materials Research , 2001, DOI: 10.1590/S1516-14392001000400014
Abstract: this research aimed at defining a route for recovering precious metals from a very heterogeneous gold bearing sulphide and arsenide concentrate that was partially roasted and dumped by the 1960s when santo antónio mine closed. gold occurs in this concentrate as free particles in the range of 10-100 mm, most of them still enclosed in the pyrite and arsenopyrite matrix. its content varies from 20 to 150 g of au/ton, being higher at the dump upper levels and in the finer concentrate fractions. preliminary tests demonstrated the refractoriness of this product, since the leaching with conventional cyanide solutions and with other leaching solutions gave very low recoveries. however, high concentrated cyanide solutions recover more than 60% of au, although with high nacn and lime consumptions and poor settling characteristics. iron was shown to be highly dissolved in these solutions. some prior treatments clearly favoured the cyanidation process, in particular a roasting step. thus, a large number of roasting experiments was carried out to define the most favourable conditions for recovering gold. however, no clear relationship between roasting conditions and gold dissolution was found due to the heterogeneity of the product and high variance of gold experimental recoveries. these recoveries were calculated considering gold contained in both the leaching residues and leachates, and uncertainties of these results are relatively high. roasting the product at 450-700 °c for 1 h guarantees a high probability to dissolve at least 74% au in a highly concentrated nacn solution stirred for 24 h. the 600-700 °c roasting range is clearly preferable for consuming less cyanide and lime. pre-washing the roasted product seems not to reduce the cyanide consumption. regarding the silver recovery, the nacn and lime consumption are higher while using the products roasted at the lowest tested temperatures. products roasted at higher temperatures have better settling performance.
Challenges in using fish communities for assessing the ecological integrity of non-perennial rivers
M.F Avenant
Water SA , 2010,
Abstract: Environmental Water Assessments (EWAs) aim to protect the ecological integrity of rivers amidst increasing anthropogenic pressures on freshwater resources, and fish communities are the ecosystem component most commonly included. The Fish Response Assessment Index (FRAI) was developed to assess the integrity of fish communities in South African rivers and is commonly applied in EWA studies. This paper reports on the suitability of the FRAI for the non-perennial Seekoei River and discusses some of the challenges faced. Our relatively long and thorough study on the Seekoei River confirmed the concerns that earlier, snapshot, fish integrity assessments in the Orange River system raised: that the existing fish indices are not ideally suited for these rivers with their naturally low species richness and hardy, generalist fish communities. Other difficulties with the use of a score-based method include prediction of the expected species, calculation of a frequency of occurrence rating, selection of the right sampling times for comparative purposes, loss of habitats and sampling points under different flow conditions, and problems experienced when using accumulated data to try to correct for a situation of having too few sampling points. At this stage a more generalised approach is suggested for the Seekoei River, and ultimately other similar non-perennial systems. This could include a number of community characteristics, such as abundance, species richness, species diversity and evenness, recruitment, fish health and the presence/absence of exotic species.
A provisional check list of the reptiles and amphibians of Golden Gate Highlands National Park
M.F. Bates
Koedoe : African Protected Area Conservation and Science , 1991, DOI: 10.4102/koedoe.v34i2.431
Abstract: A provisional check list of 26 reptile and amphibian species (8 frog, 8 lizard and 10 snake species) occurring in Golden Gate Highlands National Park is presented. The list does not reflect the results of an intensive survey, but is a record of specimens collected in the park and preserved at the National Museum, Bloemfontein.
Moraliteit, die opdringerige en die voorwaardelike
M.F. Heyns
Koers : Bulletin for Christian Scholarship , 2010, DOI: 10.4102/koers.v75i1.80
Abstract: Morality, the obtrusive and the conditional The secularist (immanentist), historicist and pluralistic nature of current thinking disables the articulation of transcendental conditions for morality. It is ostensibly especially the constancy of a structure for morality, as transcendental condition, for morality that is disputable. However, an aggressive immanentism sees to it that a transcendent origin for morality does not even appear on the agenda of late modern thinkers, which makes the latter probably an equally serious marginalisation of transcendental considerations. In this article the (sometimes unconscious) experience of some philosophers that a constant structure for morality obtrudes itself upon us, is highlighted. A further claim is that a similar obtrusion can be observed about a coherent diversity of moral sources (i.e. sources which find themselves in a transcendental position with regard to each other). The “most daring” argument is for a transcendental transcendent origin for morality.
De/re/centring of subjective power
M.F. Heyns
Koers : Bulletin for Christian Scholarship , 2000, DOI: 10.4102/koers.v65i1.465
Abstract: The centred self is the self in the centre of the universe with an underlying inner centre; that is, with one of the human abilities as the core power of the human being. I apply this distinction to the meta-psychological theories of Kenneth Gergen and Charles Taylor. Gergen liquidates the autonomous individual only to revert to a centring of the social side of the human condition. It is, according to Gergen, the postmodern condition of advanced transport and communication technologies that will be the end of the authentic self. Gergen rejects the possibility of resisting these postmodern technologies. The upshot of Gergen’s socio-technological determinism is totalitarianism as well as agonism between individual and social aspects. Taylor seemingly steers away from centring one aspect. He nevertheless partially centres intention (interpretation). This gives his de/centring also an undecided and agonistic picture; that is a self in a never-ending conflict with itself and surroundings. I suggest that only a re-centring of all human abilities will avert the final failure of the decentring of the centred self.
Akrasia (swakheid van die wil) en die kontemporêre gesprek oor subjektiwiteit
M.F. Heyns
Koers : Bulletin for Christian Scholarship , 1997, DOI: 10.4102/koers.v62i4.580
Abstract: Akrasia (weakness of will) and the contemporary discourse on subjectivity The issue about akrasia (weakness of the will) concerns the question whether the human will is strong enough to choose and realize actions, or whether a conflict, and a certain type of conflict (i.e. the issue of akrasia), will have the potential to paralyse it. My analysis focuses on ideas of thinkers of the last half of the twentieth century - thinkers like Skinner who practically denies the existence and strength of the se lf and Sartre who postulates a transcendental self with godlike capabilities. I conclude that both leave little room for the idea of akrasia. Akrasia needs a more subtle vision of the power and weakness of the self. To arrive at this conclusion I consider views attempting to reconcile the disempowerment of the se lf by the extra-self with the idea of a self in control of its situation. I argue that these views fail because they assume the akratic conflict to be behi’een the self and extra-self instead of an intra-will conflict. I also deny that the dialectic goal of a fusion o f the self and its situation will give an explanation o f the akratic conflict because dialectics still operate with a centred self which assumes a conflict between the centre and a sub-self periphery. Moreover, this kind of dialectics provides the picture of a permanent victimized self rather than an akratic conflict. I conclude by suggesting the existence of a "dense " self with more subjective capacities than is usually assumed. This, I argue, enhances the scope of, and makes the intra-will conflict more credible.
Declared Knowledge of Beginning Writers.
Morin, M.F.
L1 Educational Studies in Language and Literature , 2005,
Abstract: Most studies of the orthographic development of young writers have largely centred their attention on analyses of written productions. However, an increasing number of researchers are now devoting attention to the information provided by spoken comments made by writers during a production activity. Re- ferred to as metagraphic comments, these utterances give researchers access to young writers’ conceptualizations of written language and the various processes mobilized during a writing task. This article presents the results of a Quebec study aimed at grasping the nature of metagraphic comments and establishing their relationship to writing performance. This research was conducted with 67 French-language subjects who were each given an individual word-writing task at two different moments (at mid-year and year end) in grade one. The analysis of the metagraphic comments, using a grid to categorize them, revealed that young writers have many and varied notions about written French, even at the beginning stages of their schooling. This analysis also led to the observation that comments related to what is thought about language – metalinguistic comments – are much more numerous than those revealing thoughts about cognitive processes at work during the writing activity. Lastly, correlation analyses, which enabled an examination of the relationship between the nature of metagraphic comments and writing performance, suggest that the use of spoken aloud comments during a writing activity does not have the same impact on weak and strong writers.
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