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Search Results: 1 - 10 of 219763 matches for " F. I.; "
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Measuring Mass and Spin of Dark Matter Particles with the Aid Energy Spectra of Single Lepton and Dijet at the e+e- Linear Collider  [PDF]
I. F. Ginzburg
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.511105
Abstract:

In many models stability of Dark Matter particles D is ensured by conservation of a new quantum number referred to as D -parity. Our models also contain charged D -odd particles D± with the same spin as D. (For more information,please refer to the PDF.)

An engineered Phlebia radiata manganese peroxidase: expression, refolding, purification and preliminary characterization  [PDF]
Usenobong F. Ufot, Monday I. Akpanabiatu
American Journal of Molecular Biology (AJMB) , 2012, DOI: 10.4236/ajmb.2012.24037
Abstract: Manganese peroxidases (MnPs) are interesting enzymes in protein engineering, aimed at maximizing industrial bioprocesses such as lignin degradation and biofuel production. cDNA of the secreted short-type of MnP from Phlebia radiata (Pr-MnP3) has been successfully engineered and amplified by polymerase chain reaction (PCR). Five mutant genes (E40H, E44H, E40H/E44H, D186H and D186N) of recombinant Phlebia radiata MnP3 (rPr-MnP3) were generated. The wild-type and the mutant genes were expressed in Escherichia coli (W3110 strain) and the resultant body proteins were lysed, purified and refolded into active enzymes. 6% - 7% recovery of pure and fully active rPr-MnP3 for wild-type and mutants were obtained and the availability of rPr-MnP3 enzymes will greatly facilitate its structure-function relationships studies. rPr-MnP3 mass was characterised using SDS-PAGE and MALDI-TOF mass spectrometry. Molecular weight of both the wild-type and mutant rPr-MnP3 enzymes was approximately 36 kDa. This describes the spectral characterization of the wild-type and mutant rPr-MnP3 enzymes with are very close similarities; substantially high spin haem enzymes. Therefore we report the engineering, cloning, expression, refolding/activation of MnP3 genes and preliminary characterization of the wild-type and mutant Phlebia radiata MnP3 enzymes.
Effect of Tillage Systems and Vine Orientation on Yield of Sweet Potato (Ipomoea batatas L.)  [PDF]
I. Chagonda, R. F. Mapfeka, T. Chitata
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.521332
Abstract: In Zimbabwe sweet potato (Ipomoea batatas L.) production is practiced under different tillage systems with varying vine orientations, which contribute to variable yields. Limited research on yield loss due to these different practices is available despite that the majority of farmers are growing sweet potatoes to sustain their livelihoods. A field study was carried out at Midlands State University in the 2013/14 rainy season, to determine the effect of tillage systems and vine orientation on yield of sweet potato. A 2 × 3 factorial treatment structure in a randomized complete block design (RCBD), with three replications was used. Tillage systems had two factors (ridge and mound) and three vine orientations were used (horizontal, fold and loop). Data on storage root length, storage root diameter and storage root weight was subjected to Analysis of Variance (ANOVA) at 5% significance level. There was no interaction (p < 0.05) between tillage systems and vine orientations on storage root diameter, storage root length and storage root yield. The horizontal vine orientation gave statistically significant (p < 0.05) storage roots diameter of width 405 mm. Conversely the loop vine orientation had statistically the least (316 mm) storage root diameter. Horizontal vine orientation had significantly (p < 0.05) wider storage roots than the loop vine orientation. The ridge recorded longer (134.2 mm) mean storage root length, while those from mounds had shorter (115.9 mm) root length. The loop and the horizontal vine orientations recorded statistically the highest (35.5 t/ha and 34.8 t/ha respectively) sweet potato storage root yield. On the other hand, the fold vine orientation obtained significantly the lowest (28.7 t/ha) storage root yield. The research concluded that the horizontal and fold vine orientations had the widest storage root diameter and the ridge had longer storage root lengths. The loop and horizontal vine orientations are recommended in sweet potato production if high yields are to be achieved.
Modeling of Plane Arrays Using a Variational Approach  [PDF]
Mykhaylo I. Andriychuk, Yarema F. Kuleshnyk
Open Journal of Antennas and Propagation (OJAPr) , 2018, DOI: 10.4236/ojapr.2018.64009
Abstract:
The variational statement of synthesis problem is generalized in order to account the additional requirements to the synthesized radiation pattern (RP) and field distribution in the specified points of near zone. For this aim, the minimizing functional is supplemented by term providing the possibility to minimize the values of field in these points; creating the deep zeros in the RP for the certain angular coordinates is realized too. The approach foresees reduction of an explicit formula for field values in a near zone. The results of computational modeling testify the possibility to create zeros in the given RP and to minimize the values of field in a near zone of plane arrays in a great extent.
Comparative Study of Physical Properties of Polymer Composites Reinforced with Uncarbonised and Carbonised Coir  [PDF]
F. O. Aguele, C. I. Madufor, K. F. Adekunle
Open Journal of Polymer Chemistry (OJPChem) , 2014, DOI: 10.4236/ojpchem.2014.43009
Abstract:

This study involved the use of uncarbonised and carbonised coir in preparing composites of a given polymer. In this case natural rubber (NR) was used. Uncarbonised coir (UC) and carbonised coir (CC) were separately used to prepare the polymer composites. Carbon black (CB) was also used differently and the filler loadings for all varied between 0 and 50 phr. Before using the uncarbonised coir and carbonised coir, they were characterised on the basis of moisture content, pH, particles size and surface area. The properties of the various composite samples prepared were then investigated. The results of the tests obtained for the NR-UC composites were compared with those of NR-CC and also with those of NR-CB composites. It was observed that for hardness, the results obtained from composites of UC and CC fillers showed similar trends with those of carbon black (CB) reinforced composites, increasing with increase in filler volume. For the tensile strength and modulus a trend of slight rise was observed. There were no sharp rises in values as filler volumes were increased. UC and CC fillers were observed to impart very poorly on the tensile strength and modulus relative to the CB reinforced composites. The results from test for elongation, compression set and flex fatigue showed a falling trend for all the fillers to a comparable level with CB. It was generally observed that the uncarbonised coir presented better potentials for reinforcement than the carbonised coir.

Editorial
F. I. Pugnaire,F. Valladares
Web Ecology (WE) , 2006, DOI: 10.5194/we-6-1-2006
Abstract: No abstract available.
Efeito da reten??o de um herbicida pela cobertura morta do solo, no controle das ervas daninhas e na produ??o do milho com cultivo mínimo
Pastana, F. I.;
Bragantia , 1972, DOI: 10.1590/S0006-87051972000100022
Abstract: this study was designed to determine the effects of atrazine, mulching, and irrigation on weed growth and corn yields in minimum tillage. it consisted of two field experiments set out on two soil types, which were a typic hapludult, cecil series, and a typic paleudult, norfolk series, located at watkinsville and midville, georgia, u.s.a., respectively. the experimental areas were planted to corn with irrigated and non-irrigated treatments, with mulched and non-mulched (bare) soil surfaces. these plots were sprayed with four rates of atrazine (aatrex w-80). for the conditions of this study, the following conclusions are indicated: 1 - weed growth was more vigorous on mulched, non-irrigated plots than on plots with other treatments on cecil soil. no significant differences in weed growth were found between treatments on norfolk soil. on both experiments it was observed that weed growth tended to be less as rates of atrazine were increased; 2 - corn yields were substantially higher on mulched soil than under non-mulched ones, especially with irrigation on cecil soil. mulching did not affect corn yields significantly on the norfolk soil. atrazine controlled weeds and increased corn yields significantly on the norfolk soil only.
Factors influencing disclosure of HIV positive status in Mityana district of Uganda
I Kadowa, F Nuwaha
African Health Sciences , 2009,
Abstract: Background: Disclosure of HIV positive sero-status to sexual partners, friends or relatives is useful for prevention and care. Identifying factors associated with disclosure is a research priority as a high proportion of persons living with HIV/AIDS (PHA) never disclose. Objective: To identify factors associated with disclosure among PHAs in Mityana district of Uganda. Methods: Using a case control design, we compared 139 PHAs who had disclosed to 139 PHA who had not disclosed regarding socio demographic characteristics, sexual behaviour, individual experiences and perceptions about disclosure, as well as on health facility/community correlates of disclosure. Results: The independent factors that favour disclosure are not fearing negative outcomes of disclosure adjusted odds ratio (AOR) 7.00, 95 % confidence interval (95% CI) 3.03-16.95, having communication skills to disclose (AOR 12.08, 95% CI 4.94-29.51), having initiated anti-retroviral therapy (AOR 7.51, 95% CI 3.42-16.49), not having tested for HIV during ante-natal clinic (AOR 5.07, 95% CI 1.95-13.10), receiving ongoing counselling (AOR 4.33, 95% CI 1.50-12.51) and having ever seen a PHA publicly disclose his/her HIV status AOR 2.73, 95% CI 1.24-6.02). Conclusions PHAs that have not initiated anti-retroviral therapy (ART), test for HIV in ante-natal clinic and fear negative outcomes need more help in disclosure. Measures that empower PHA to disclose such as those that lead to improved communication skills should be reinforced during ongoing counselling
Evaluation of Biomass Availability for Biogas Production at Regional Level
I. Dzene , F. Bodescu
Scientific Journal of Riga Technical University. Environmental and Climate Technologies , 2009, DOI: 10.2478/v10145-009-0007-6
Abstract: Currently available data were used in an integrated deterministic modelling approach to assess the total biomass availability. The conceptual approach of combining the benefits of relational database and GIS modelling was tested in two eastern European countries - in Latvia and Romania, both located in different bio-geographical regions. The developed system has proven its efficiency in dealing with heterogeneity in different levels of complexity regarding environmental and ecological structures. The overall approach of assessing the biomass resources was first to estimate the quantity of material generated from municipal waste and agricultural practices in each of research areas. The quantity of material that could be recovered from these practices was then taken into account and the technical and environmental constraints associated with other site factors were evaluated. As a result, the particular areas with high, medium and low potential in each country were identified.
Ellipsometry for the study of gold surfaces
E. F. I. Roberts
Gold Bulletin , 1973, DOI: 10.1007/BF03215183
Abstract: Ellipsometry is an elegant and sensitive method for the study of surface films. This article outlines the technique and describes an investigation of the adsorption of organic vapours on the faces of gold contacts in which it was essential to maintain experimental conditions as close as possible to those of actual works practice.
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