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السجلات المعروضة 281 -- 290 من 296
Noether symmetries and conservation laws of wave equation on static spherically symmetric spacetimes with higher symmetries
(
Elsevier
, 2014 , Article)
In Bokhari et al. (2011), the Noether symmetries of the wave equation on a general spherically symmetric spacetime metric were provided in terms of five functions of the variables t and r subject to certain differential ...
Nanofluid in tilted cavity with partially heated walls
(
Elsevier
, 2014 , Article)
Lattice Boltzmann Method is applied to investigate the natural convection flow utilizing nanofluids in square enclosure with partially heated walls. The fluid in the cavity is a water-based nanofluid containing different ...
A method for generating approximate similarity solutions of nonlinear partial differential equations
(
Hindawi Publishing Corporation
, 2014 , Article)
Standard application of similarity method to find solutions of PDEs mostly results in reduction to ODEs which are not easily integrable in terms of elementary or tabulated functions. Such situations usually demand solving ...
Approximate analytic solutions of transient nonlinear heat conduction with temperature-dependent thermal diffusivity
(
Hindawi Publishing Corporation
, 2014 , Article)
A new approach for generating approximate analytic solutions of transient nonlinear heat conduction problems is presented. It is based on an effective combination of Lie symmetry method, homotopy perturbation method, finite ...
Hypolithic cyanobacteria colonization of quartz at South Desert
(
Science Publications
, 2014 , Article)
Hypolithic microbial communities (found underneath rocks) were encountered in the southern desert of Qatar where quartz rocks are ubiquitous and are a substrate for hypoliths. These hypoliths thrive where extreme temperature, ...
Overcome of carbon catabolite repression of bioinsecticides production by sporeless Bacillus thuringiensis through adequate fermentation technology
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Hindawi Publishing Corporation
, 2014 , Article)
The overcoming of catabolite repression, in bioinsecticides production by sporeless Bacillus thuringiensisstrain S22 was investigated
into fully controlled 3 L fermenter, using glucose based medium. When applying adequate ...
Application of statistical experimental design for optimisation of bioinsecticides production by sporeless Bacillus thuringiensis strain on cheap medium
(
Sociedade Brasileira de Microbiologia - SBM
, 2014 , Article)
In order to overproduce bioinsecticides production by a sporeless Bacillus thuringiensis strain, an optimal composition of a cheap medium was defined using a response surface methodology. In a first step, a Plackett-Burman ...
Isolation of the Bacillus thuringiensis plasmid carrying Bacthuricin F4 coding genes and evidence of its conjugative transfer
(
The Journal of Infection in Developing Countries
, 2014 , Article)
INTRODUCTION:
Conjugation is an excellent natural mode of DNA transfer in vivo between bacteria, particularly when these conjugative elements carry technological traits such as bacteriocin encoding genes. In the present ...
The impact of Qatar national professional standards: Teachers’ perspectives
(
Consortia Academia Publishing
, 2014 , Article)
Over the past twenty years, countries have embraced educational reforms that are driven by
standards-based education that include professional standards for teachers. This is the case in
Qatar where professional standards ...
What Mothers Know About Child Development and Parenting in Qatar: Parenting Cognitions and Practices
(
SAGE Publications
, 2014 , Article)
Maternal knowledge is important to parenting behaviors, children’s development and well-being. Mothers’ knowledge of child
development has been shown to have a significant influence on the way mothers interact with their ...