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Now showing items 1211-1220 of 1373
Mechanochemical Transformation of CF3 Group: Synthesis of Amides and Schiff Bases
(
Wiley
, 2021 , Article)
We communicate two mild, solvent-free mechanochemical coupling transformations of CF3 group with nitro compounds into amides or Schiff bases employing Ytterbia as a catalyst. This process proceeds via C−F bond activation, ...
Testing a Model of the Threat of Street Sexual Harassment in Egypt: Implications for Social Work Education
(
Macrothink Institute
, 2021 , Article)
This study tested a model of Egyptian women’s well-being and perception of the threat of sexual harassment. The model was drawn from multiple theoretical frameworks, including the vulnerability perspective, objectification ...
New tetradentate Schiff base Cu(II) complexes: synthesis, physicochemical, chromotropism, fluorescence, thermal, and selective catalytic oxidation
(
Springer
, 2021 , Article)
Three neutral Cu(II)/ƞ4-NNNO Schiff base complexes (1-3) were prepared from the (E)-4-nitro-2-(((2-(piperazin-1-yl)ethyl)imino)methyl)phenol, tetradentate Schiff base (SB) ligand, and the corresponding copper(II) salts. ...
Adhesion characteristics of solution treated environmental dust
(
Nature Research
, 2020 , Article)
Environmental dust is modified towards self-cleaning applications under the gravitational influence. Dust particles are collected in the local area of Dammam in Saudi Arabia and they are treated with a dilute hydrofluoric ...
Evidencing the role of carbonic anhydrase in the formation of carbonate minerals by bacterial strains isolated from extreme environments in Qatar
(
Elsevier
, 2022 , Article)
Calcium carbonate, one of the most abundant minerals in the geological records is considered as primary source of the carbon reservoir. The role of microorganisms in the biotic precipitation of calcium carbonate has been ...
Socio-Economic Development, Globalization and the Need for Heritage Policy in Qatar: Case Study
(
Scientific Research Publishing Inc
, 2021 , Article)
Qatar, has a rich history and seen many changes in a small amount of time, investigating its heritage. Although a young state established in 1868 Qatar’s key sectors is trying to create their own policy strategies. Major ...
Study of bacterial interactions in reconstituted hydrocarbon-degrading bacterial consortia from a local collection, for the bioremediation of weathered oily-soils
(
Elsevier B.V.
, 2021 , Article)
To enhance the process of bacterial remediation of weathered hydrocarbons, the area of Dukhan, Qatar, was considered as a model for weathering processes. Self-purification by indigenous hydrocarbon-degrading bacteria showed ...
Hidden and Self-Excited Collective Dynamics of a New Multistable Hyper-Jerk System with Unique Equilibrium
(2022 , Article)
Nonlinear dynamical systems with hidden attractors belong to a recent and hot area of research. Such systems can exist in different forms, such as without equilibrium or with a stable equilibrium point. This paper focuses ...
b2 -Metric spaces and some fixed point theorems
(
Springer International Publishing
, 2014 , Article)
The aim of this paper is to establish the structure of [InlineEquation not available: see fulltext.]-metric spaces, as a generalization of 2-metric spaces. Some fixed point results for various contractive-type mappings in ...
Simulation of natural convective heat transfer and entropy generation of nanoparticles around two spheres in horizontal arrangement
(
Elsevier
, 2021 , Article)
Herein, laminar convective heat transfer from two horizontally arranged spheres has been evaluated by using numerical models inside water-based fluids incorporated with alumina (Al2O3), copper oxide (CuO), and copper (Cu) ...