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Search Results: 1 - 10 of 565039 matches for " I.A.W. Macdonald "
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The Black Cuckoo-Shrike Campephaga flava: A new record for the Mountain Zebra National Park and the Cradock district, Cape Province
I.A.W Macdonald
Koedoe : African Protected Area Conservation and Science , 1984, DOI: 10.4102/koedoe.v27i1.559
Abstract: The avifauna of the Mountain Zebra National Park (MZNP) has been recorded over a period of some two decades (Skead 1965, Koedoe 8: 1-40; Penzhorn & Bronkhorst 1976, Koedoe 19: 171-174; Penzhorn 1977, Koedoe 20: 205-207; Grobler & Bronkhorst 1981, Koedoe 24: 199-203). Collett (1982 Southern Birds 9: 1-65) has summarised all the available information on the avifauna of the Cradock district assembled since the turn of the century. Although 203 species are recorded from the MZNP by these authors (and a further four in the roneoed checklist for the park (Anon, updated, National Parks Board of Trustees, roneod, 15 pp)) no mention is made of the Black Cuckoo-Shrike Campephaga flava. Collett (1982) does not list it for the Cradock district.
A List of Alien Plants in the Kruger National Park
I.A.W. Macdonald,W.P.D. Gertenbach
Koedoe : African Protected Area Conservation and Science , 1988, DOI: 10.4102/koedoe.v31i1.491
Abstract: The alien vascular plant flora of the Kruger National Park is listed. Annotations cover the invasive status, modes of introduction and dispersal, dates of first recording, ecological impacts and control status of each species. The list comprises 156 species of which 113 are considered invasive within the park. Most of the species have been accidentally introduced to the park. The ecological impacts of 27 species (of which 11 are trees and shrubs) were rated as moderate or high. By 1985 only 10 species are thought to have been eradicated from the park. Most of the invasive species are herbaceous weeds of man-disturbed sites and the eradication of these is generally considered impossible. Most of the important species are dispersed by water and animals. The significance of limiting reinvasion of the park down the rivers flowing into the park, is stressed.
Adsorption Isotherms, Kinetics, Thermodynamics and Desorption Studies of Basic Dye on Activated Carbon Derived from Oil Palm Empty Fruit Bunch
I.A.W. Tan,B.H. Hameed
Journal of Applied Sciences , 2010,
Abstract: The adsorption characteristics of basic dye (methylene blue, MB) on activated carbon prepared from oil palm Empty Fruit Bunch (EFB) were evaluated. The effects of dye initial concentration, agitation time, solution pH and temperature on MB adsorption were investigated. The adsorption uptake was found to increase with increase in initial concentration, agitation time and solution temperature. The adsorption equilibrium data were best represented by the Langmuir isotherm. The adsorption kinetics was found to follow the pseudo-second-order kinetic model. The mechanism of the adsorption process was determined from the intraparticle diffusion model. Boyd plot revealed that the adsorption of MB on the activated carbon was mainly governed by external mass transport where particle diffusion was the rate limiting step Thermodynamic parameters such as standard enthalpy (ΔH°), standard entropy (ΔS°), standard free energy (ΔG°) and activation energy were determined. The regeneration efficiency of the spent activated carbon was acceptably high, with MB desorption of 71%.
The Integration of Income Generating Activities into Low Cost Housing Units to Reduce Poverty in Developing Countries
I.A. Ademiluyi,W.O. Otun
Pakistan Journal of Social Sciences , 2012, DOI: 10.3923/pjssci.2010.187.199
Abstract: Poverty has been recognized as a phenomenon that is of concern to everybody around the world today, both the rich and the poor. The review of the literature shows that one basic way to reduce poverty is for the various governments to engage people in meaningful and satisfying jobs either by creating the jobs or by empowering the people to be self employed. This study looked at the issue of poverty in the developing countries of the world. It then examined unemployment as one of the causes of poverty and proposes flexibility in physical planning laws, development controls and building codes and regulations in developing countries to allow the integration of income generating activities (with minimal environmental impact) into low income housing. Where such mix uses are not allowed, several studies in urban centres in developing countries have shown that a good proportion of residential units are converted to commercial use without approval from the local planning authorities. The result of an empirical study carried out in Surulere local government area, Lagos, Nigeria shows that 87.9% of households in the area did not seek for approval from local town planning authority before they converted part or the whole of their building for the business they were doing. It is also shown that households involved in home income generating activities in high density areas earn more income than those households not involved and the reverse is the case in the medium residential density area. Hence, this supports the view that people converted part of their houses into commercial use to generate additional income and reduce level of poverty. City planners should now understand that the effectiveness of plans to bring about a city's continued economic viability depends on the correct analysis and interpretation of the social, cultural and economic forces interacting within the city.
Geochemical Exploration for Gold and the Association of As-Cu-Pb-Sn-Zn-Li in the Upper Proterozoic Granitoids of the Wadi Rumman Area, Southwest Jordan  [PDF]
I.A.A. Bany Yaseen
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.610089
Abstract: The geochemical studies were conducted in an area covering about 15 km2of the south side of the Wadi Rumman area, SW Jordan. The study area included a part of a basement of complex exposed rocks in southwestern Jordan. The complexes comprised igneous and metamorphic suites, mostly from the late Proterozoic age. A systematic geochemical sampling was conducted using rock and heavy mineral-panned concentrate of geochemical samples. Fifty rock samples were collected from the granitic rocks, simple pegmatite dyke, quartz veins and alteration zone, which covered the area. Next, 45 heavy mineral-panned concentrate samples were collected from the alluvium in the stream sediment within the catchment area, and the dray was sieved to less than 1 mm grain size. The geochemical samples were analyzed for their trace elements and gold by using Ione Conductive Coupled Plasma Emission Spectroscopy (ICP-AES) and the Atomic Absorption Spectrometer (AAS) at Natural Resources Authority (NRA) Labs. The results of the geochemical analysis indicated the presence of gold and heavy minerals in the study area, a result considered abnormal in the rock samples. A strong positive correlation was recorded of Au with As, Cu and W (r =0.82, 0.7 and 1.0), as with Mo (r = 0.83), Cu with Pb (r = 0.83), Sn with Mo (r = 0.73), Mo with W (r = 0.97), Zn with W (r = 0.71), and Li with Bi (r = 0.7). These correlations revealed gold associated within the hydrothermal alteration, quartz veins and pegmatite dyke. Abnormal metals such as As and Bi were good path-finders to find Au. The HM samples showed low positive linear correlations among the concentrations of Au with As, Zn and Li, and negative linear correlations of Au with Pb, Sn, Bi and W. The combination of both rock and heavy mineral concentrate samples shows four geochemical anomalous areas of gold and heavy minerals. The geochemical signatures of Au and As in the Wadi Rumman appear to be in the hydrothermal alteration, quartz veins and pegmatite dyke, respectively. Heavy mineral concentration sampling delineated the Au geochemical anomaly in area 1 specificities with the rock geochemical anomaly of area 1.
Note on Laguerre Transform in two Variables  [PDF]
Ajay Shukla, I.A. Salehbhai
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.14035
Abstract: An attempt is made to investigate the some new properties of Laguerre transform in two variables [1].
Journal of Applied Phytotechnology in Environmental Sanitation , 2012,
Abstract: The aim of this paper is to determine the difference between the antimicrobial and coagulation activity of crude extracts of Moringa oleifera grown in different parts of North East, Nigeria. Moringa oleifera seeds were plucked from trees in three states of the North East Nigeria namely Adamawa, Borno and Yobe States. The results indicated that crude aqueous extracts of Borno Moringa oleifera, Yobe Moringa oleifera and Adamawa Moringa oleifera showed different degrees of growth inhibitions to microorganisms. Statistically the origin of Moringa oleifera seed had no significant influence on its antimicrobial properties from the present work. On coagulation the Moringa oleifera seed from Adamawa State had the fastest turbidity removal rate of 18NTU/minute within the first 30minutes. This was faster than 12.4NTU/minute and 15.53NTU/minute for Moringa oleifera samples from Yobe and Borno states respectively within the same time interval.
On the Effect of Rotatory Inertia and Shear Deformation ofEquation of Motion for the Forced Vibration of a Uniform Beam
M.K. Kolawole,A.W. Gbolagade,M.O. Olayiwola,I.A. Idowu
Journal of Engineering and Applied Sciences , 2012,
Abstract: The effect of rotatory inertia and shear deformation on the natural frequency of a simple supported uniform beam was investigated. The effect of rotatory inertia alone is considered and the resulting equation of motion does not contain any term involving the shear coefficient. If the effect of shear, deformation alone is considered, the resulting equation of motion does not contain the original form ρI( 2φ/ t2) and both are disregarded, the resulting equation reduces to the classical equation of motion.
Structure Refinement of (Sr,Ba)Nb2O6 Ceramic Powder from Neutron and X-Rays Diffraction Data
Carrio J.G.,Mascarenhas Y.P.,Yelon W.,Santos I.A.
Materials Research , 2002,
Abstract: The structure of polycrystalline strontium barium niobate at room temperature was refined by the Rietveld method. Sintered ceramic samples were used to collect powder neutron and X-ray diffraction data. The ratio Sr/Ba ~ 64/36 was found from the initial batch composition Sr0.61Ba0.39Nb2O6, corroborating with the quantitative X-ray dispersive spectroscopy (EDS) measurements. The structure is tetragonal with cell parameters a, b = 12.4504(3) and c = 3.9325(1) and space group P4bm. It was not necessary to introduce any positional disorder for the oxygen atoms. Cation Nb+5 displacements not parallel to the c direction are presented, which can influence the behavior of the ferroelectric properties.
Factors related to shell deaths during artificial incubation of ostrich eggs
Z. Brand,S.W.P. Cloete,C.R. Brown,I.A. Malecki
Journal of the South African Veterinary Association , 2012, DOI: 10.4102/jsava.v78i4.322
Abstract: he ostrich industry experiences a high rate of embryonic mortalities during artificial incubation of eggs. Embryonic deaths were studied from data recorded on 37 740 fertile eggs incubated artificially during the 1998-2005 breeding seasons. Roughly 10 000 eggs that sustained embryonic mortalities were classified according to the stage and nature of death, i.e. before 21 days of incubation, after 21 days of incubation, deaths after pipping and rotten eggs. Although infection may have played a role in ~1300 rotten eggs, no detailed knowledge of the pathogens involved was available. The remainder of deaths could not be related to pathogens and the deaths were thus generally referred to as non-infectious. The overall level of embryonic mortality in all the eggs studied was 28.5 %. Overall embryonic mortality was affected by incubator, with higher levels (57.0 %) found in eggs incubated in an African Incubator(R) and also in eggs that were transferred between incubators during incubation (38.1 %). Overall embryonic mortality also increased in eggs produced by older females. Eggs produced in the autumn had the highest level of embryonic mortality at 53.6 %, whereas eggs produced in the winter had a marginally higher level of embryonic mortalities of 29.2 % compared with eggs produced during summer (27.4 %). Eggs produced by South African (SA) Black males crossed to Zimbabwean Blue females had high levels of embryonic losses of 45.7 %. The embryonic mortality of eggs produced by SA Blacks or Zimbabwean Blue breeding birds subjected to pure breeding was similar at ~33-34 %, but embryonic mortality was improved in eggs produced by Zimbabwean Blue males crossed to SA Black females (27 %). Embryonic mortality was increased in eggs that were set directly (32.0 %) or subjected to longer than 6 days of storage (43.5 %). Embryonic mortality was affected by year. The results that were obtained will assist in determining non-infectious factors that have a negative effect on hatching success. Steps can thus be taken to eliminate such factors that may compromise hatching success.
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