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Screen integrable lightlike hypersurfacesof indefinite sasakian manifolds

Massamba, F. (Birkhäuser Basel. http://www.springerlink.com/content/110963/?p=c42ba01ff0bd482b81a3ebdf3b649c9a&pi=0, NaN, 2009)

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Abstract:	We investigate lightlike hypersurfaces of indefinite Sasakian manifolds, tangent to the structure vector field and whose screen distribution is integrable. We prove some results on parallel vector fields and on a leaf of the integrable distribution D0? h i of this class. A theorem on a geometrical configuration of the screen distribution is obtained. We show that any totally contact umbilical leaf of a screen integrable distribution of a lightlike hypersurface is an extrinsic sphere.
Description:	The mathematical symbols may not come as they are in the abstract.
URI:	http://hdl.handle.net/10311/689

Files in this item: 1

Screen Integrable Lightlike.pdf (1.251Mb)

Stochastic models for sunshine duration and solar irradiation

Jain, P.K.; Lungu, E.M. (Elsevier Science Ltd: http://www.elsevier.com/wps/find/journaldescription.cws_home/969/description#description, NaN, 2002)

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Abstract:

Abstract Harmonic analysis of sunshine duration and solar irradiation measured at Sebele, Botswana is carried out. The data used consists of the monthly averages and the Julian-days averages of sunshine duration and solar irradiation sequences. This study involves splitting the time series into deterministic and stochastic components, and determining the proportion of the variance explained by each component. The stochastic component is analyzed for persistence using the Box and Jenkins technique. It is found that the stochastic component for monthly averages solar radiation series is best described by the second-order autoregressive Markov process, while that for Julian-days averages series has no memory.

URI:

http://hdl.handle.net/10311/138

Files in this item: 2

license.txt (1.998Kb)

Stocastic model ... and solar irradiation.pdf (614.0Kb)

String Homology of a Product of Spheres and the Witt Algebra

Gatsinzi, J-B.; Kwashira, R. (Nova Science Publishers, Inc.; www.novapublishers.com; reprinted with permission from Nova Science Publishers, Inc., NaN, 2007)

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Abstract:	Let X be a finite product of even dimensional spheres, we show that the string homology of X contains a finite product of copies of the Witt Lie algebra.
URI:	http://hdl.handle.net/10311/162

Files in this item: 1

gatsinzi-kwashira1.pdf (139.6Kb)

A study of pulsatile blood flow modeled as a power low fluid in a constricted tube

Prakash, J.; Ogulu, A. (Elsevier; www.elsevier.com/locate/ichmt, July NaN, 2007)

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Abstract:	A mathematical model for the pulsatile blood flow in a small vessel in a cardiovascular system with a mild stenosis is analyzed. Blood is modeled as a power low fluid and the differential approximation for the heat flux is invoked in the energy equation. The effect of heat transfer on the velocity is computed and discussed.
URI:	http://hdl.handle.net/10311/226

Files in this item: 2

license.txt (1.998Kb)

Prakash_ICHMT_2007.pdf (772.9Kb)

Teachers’ experiences with an adapted IGCSE physics syllabus in Botswana

Koosimile, A.T. (Elsevier, www.elsevier.com/locate/ijedudev, NaN, 2005)

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Abstract:

This paper focuses on teachers’ experiences with implementing a modified International General Certificate of Secondary Education (IGCSE) physics syllabus in Botswana. The syllabus, characterised by a new organisational and pedagogic paradigm, is a significant shift from the traditional ‘‘teacher-proof’’ syllabus to one that is flexible, nonprescriptive and student-centred. Through data from discussions and interviews with teachers, it emerged that policy statements on the nature of the syllabus were contradictory and confusing to guide both the adoption and implementation of the syllabus. It also emerged that teachers accorded the core curriculum component of the syllabus a lower priority and status than the extended curriculum component. The findings also reveal that considerable overlaps in the core and extended curriculum components of the syllabus blurred the distinction between the two as well as weakening prospect of fidelity of adoption and implementation. The resulting ‘innovation gap’ invariably means that the ideals of the syllabus and the associated paradigm shifts are possibly not realised in teaching in Botswana. The findings generally underscore the importance of clear guidance and policy statements on any new syllabus, and indeed, a new curriculum. Possible directions in future research would be to investigate innovation gaps that might be manifest in teaching.

URI:

http://hdl.handle.net/10311/499

Files in this item: 1

Koosimile2005ICGSEphysics.pdf (1.142Mb)

Thermal analysis and annealing temperature dependence of electrical properties in Sn10Sb20Se70 glassy semiconductor

Kumar, P.; Thangaraj, R.; Sathiaraj, T.S. (Springer Netherlands, NaN, 2008)

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Abstract:	The melt-quenched Sn10Sb20Se70 sample in the bulk form was used to prepare films on well-cleaned glass substrates by thermal evaporation method. The activation energy for glass transition (apparent) and crystallization has been analyzed by using the Kissinger formulation. The X-ray diffraction study shows the crystallization of Sb2Se3 phase in the major proportion as compared to the SnSe2 phase. The SEM images film of the show the appearance of spherical globules upon annealing below the glass transition temperature. The effect of annealing temperature on the electrical and optical properties has been studied. A linear fit between DE and Eo is observed, indicating the validity of Meyer–Neldel rule with the change in the annealing temperature.
Description:	some mathematical symbols may not come as they are in the title and abstract.
URI:	http://hdl.handle.net/10311/691

Files in this item: 1

Thermal analysis.pdf (949.2Kb)

Vector measures of bounded semivariation and associated convolution operators

Saab, P.; Robdera, M.A. (Glasgow Mathematical Journal Trust, http://journals.cambridge.org/action/displayJournal?jid=GMJ, NaN, 2011)

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Abstract:	Let G be a compact metrizable abelian group, and let X be a Banach space. We characterize convolution operators associated with a regular Borel X-valued measure of bounded semivariation that are compact (resp; weakly compact) from L1(G), the space of integrable functions on G into L1(G)ˇ⊗X, the injective tensor product of L1(G) and X. Along the way we prove a Fourier Convergence theorem for vector measures of relatively compact range that are absolutely continuous with respect to the Haar measure.
Description:	the symbols on the abstract may differ from the original script
URI:	http://hdl.handle.net/10311/1004

Files in this item: 1

Saab_GMJ_2012.pdf (83.98Kb)

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