202,744 research outputs found
A half-century of metal and metalloid-containing polymers
No full textAlaa S. Abd-El-Aziz ... [et al.]; Includes bibliographical references and indexes.; Editor, Alaa S. Abd-El-Aziz, is currently President of the University of Prince Edward Island.Source type: Electronic(1
A new species of Brevipalpus Donnadieu (Acari: Tenuipalpidae) and key to the Egyptian species
No full textHalawa, Alaa M., Fawzy, Magdy M. (2014): A new species of Brevipalpus Donnadieu (Acari: Tenuipalpidae) and key to the Egyptian species. Zootaxa 3755 (1): 87-95, DOI: 10.11646/zootaxa.3755.1.
HSSF CW, at a Primary school in Marrakesh
No full textThe bioreactor that was the subject of the experimental set-up is an underground subterranean wetland HSSF CW. We realized it and implemented it in a primary school in Marrakesh (Morocco) (31°42024 "N, 7°58050" W, 451m) for the purification of the greywater of this school with the aim of reusing the water treated for the watering of its green spaces, with an average annual temperature of 19 ° C and an annual rainfall of 282 mm.
Our bioreactor is a rectangular tank (with dimensions 5 m long, 1.0 m wide and 0.6 m deep). Three different porous media layers were used, namely medium gravel (MG),_ne gravel (FG) and cobbles (CO). Each one represents a full compartement of 0.2m tickness and 5m long. The tank is planted using the cattails (C, Typha latifolia). Regarding other data for the CW layers, we have the following values respectively for MG, FG and CO: porosity(w) 0.33, permeability(K ):6.5710 ^-2 m2; 1.81 10 ^-3 m2 , and 9.8 10 ^-10 m2 . Condition of flow: Wastewater enters the domain through boundary 3 (a length of 1 m in the xth direction representing the mixing zone) where a constant hydraulic head of 0.6 m is defined and the effluent leaves through boundary 5 (a length of 0.1 m in the yth direction), where a constant hydraulic head of 0.5 m is defined. Boundaries 1, 2,4 and 6 represent a null fux
HSSF CW, at a Primary school in Marrakesh
No full textThe bioreactor that was the subject of the experimental set-up is an underground subterranean wetland HSSF CW. We realized it and implemented it in a primary school in Marrakesh (Morocco) (31°42024 "N, 7°58050" W, 451m) for the purification of the greywater of this school with the aim of reusing the water treated for the watering of its green spaces, with an average annual temperature of 19 ° C and an annual rainfall of 282 mm.
Our bioreactor is a rectangular tank (with dimensions 5 m long, 1.0 m wide and 0.6 m deep). Three different porous media layers were used, namely medium gravel (MG),_ne gravel (FG) and cobbles (CO). Each one represents a full compartement of 0.2m tickness and 5m long. The tank is planted using the cattails (C, Typha latifolia). Regarding other data for the CW layers, we have the following values respectively for MG, FG and CO: porosity(w) 0.33, permeability(K ):6.5710 ^-2 m2; 1.81 10 ^-3 m2 , and 9.8 10 ^-10 m2 . Condition of flow: Wastewater enters the domain through boundary 3 (a length of 1 m in the xth direction representing the mixing zone) where a constant hydraulic head of 0.6 m is defined and the effluent leaves through boundary 5 (a length of 0.1 m in the yth direction), where a constant hydraulic head of 0.5 m is defined. Boundaries 1, 2,4 and 6 represent a null fux
HSSF CW, in a slum near Marrakesh
No full textOur artificial marsh that was the subject of the experimental installation is an underground wetland with horizontal flow below the surface (HSSF CW). We have produced two bioreactors in the urban community of Douar Ait Hammou in Ghmat which is located near Marrakech (Morocco). These geographic coordinates are as follows: 31 ° 25'38.9 "N 7 ° 46'35.8" W. It is a shanty town with about 500 inhabitants. The main goal of our experience is to sensitize the inhabitants of this slum on the need to transform wastewater, which previously is thrown into the wild, into water usable for the irrigation of agricultural fields and trees and some nurseries (which is the major specialty of the inhabitants of this urban community).
Our two bioreactors are installed in the form of a rectangular tank with the following dimensions: 5.00 m long, 1.00 m wide and 0.60 m deep.
Three different porous support layers were used, namely a draining layer, a transition layer and a filtering layer. One of them is not planted and the other is planted using a reed (Phragmites autralis) in order to understand and justify the interest of the plantation.
We have reported in the following Excel table the results of the measurements that we have made for 120 days
R02. HIV-1 Tat Promotes Age-Related Anxiety-like, Antinociceptive, and Neuromuscular Impairments in Aged Male Mice
No full textCorresponding author (BioMolecular Sciences): Alaa Qrareya, [email protected]://egrove.olemiss.edu/pharm_annual_posters/1001/thumbnail.jp
Investigating the role of maths intelligence and failure mindsets and the responses of teachers and mothers to pupils’ maths intelligence mindsets and/or achievement in Riyadh, Saudi Arabia.
No full textIntelligence mindset refers to beliefs regarding the fixedness or malleability of intelligence andincludes two types: growth and fixed (Haimovitz & Dweck, 2017). Previous research has confirmedthe associations between students’ intelligence mindsets and achievement. Additionally, recentstudies have demonstrated the importance of adults’ mindsets and practices on shaping children’sintelligence mindsets and influencing their achievement. Accordingly, Haimovitz and Dweck (2017)developed a model suggesting that adults’ intelligence and/or failure mindsets might impact theirresponse toward their children’s success and/or failure, thus influencing their children’s intelligencemindsets. This thesis aimed to test this model in the subject of mathematics, to understand and toexplain the role of adults’ mindsets and responses in forming their children’s intelligence mindsets.Additionally, this thesis sought to expand the literature by investigating the impact of mindsets in aSaudi Arabian context, as most studies into mindsets have been conducted in Western countries.Firstly, a systematic review aiming to investigate the relationship between teacherintelligence mindset and pupils’ maths achievement was conducted. The review included sevenstudies that reported mixed evidence. Secondly, a qualitative study exploring the role of 30 primarymaths teachers’ intelligence mindsets and practices in their pupils’ maths success and failure wascarried out. As a result of thematic analysis, five overarching themes emerged. Lastly, a quantitativestudy was also conducted. It explored the impact of maths teachers’ and mothers’ intelligence andfailure mindsets on their response orientations to a pupil’s/child’s maths failure scenario and howthese influenced their intelligence mindsets. The findings showed that across 56 pupils (aged 10 to12 years old) and their mothers and maths teachers (one triad per school) only the mothers’mindset/practice was found to shape their child’s intelligence mindset concerning their maths’ability. The implications, strengths, limitations and recommendations for future research were alsoprovided
Comparison of AlaA with structurally homologous enzymes.
No full text<p>(<b>A</b>) Phylogenetic tree based on structure-based multiple sequence alignments of AlaA obtained from PDBeFold <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0102139#pone.0102139-Krissinel1" target="_blank">[58]</a>. Functionally related enzymes are shaded in like colors; alanine transaminases in gold, tyrosine aminotransferases (TyrAT) in cyan, aspartate aminotransferases (AspAT) in pink, kynurenine aminotransferases (KAT) in green, aspartate decarboxylases (CobD, AspDC, in orange), histidinol phosphate aminotransferases (HspAT) in grey; other transaminases of unknown function or with unique substrate preferences are not shaded. (<b>B</b>) Cartoon representation of alanine transaminases of known structure, highlighting the overall fold structure, catalytic residues, cofactor status and N-terminal motifs of AlaA (PLP, acetate), <i>Pf</i>AlaAT (PMP, PDB 1xi9), <i>Hv</i>AlaAT (DCS, PDB 3tcm) and human ALT2 (PLP, PDB 3ihj). In AlaA and <i>Hv</i>AlaAT the N-terminal H1-plug-H2 motifs are fully structured, whereas in <i>Pf</i>AlaAT and ALT2 different segments of the N-terminal arm are disordered. The most representative <i>Pf</i>AlaAT monomeric structure (present in three out of four copies in the crystal asymmetric unit) lacks interpretable electron density for the eight-residue segment (from Ala14 to Leu20, delimited by orange spheres) spanning the plug. In ALT2, the N-terminal 65-amino-acid residues fold into a long β-hairpin structure that swaps domain and extends toward the opposite subunit (the start and end of the swapped β-hairpin are marked with asterisks), partially covering the active site cavity and ending in a ten-residue unstructured segment (spanning Ile95 to Gln104 until the anchor Pro105 residue). This disordered region (delimited by yellow spheres) is also located over the substrate-binding pocket and therefore may have functional and structural roles akin to those of the plug motif described in AlaA and <i>Pf</i>AlaAT.</p
DS1_JVDI_10.1177_1040638719843171 – Supplemental material for Anaplasma spp. in dairy ruminants in Jordan: high individual and herd-level seroprevalence and association with abortions
No full textSupplemental material, DS1_JVDI_10.1177_1040638719843171 for Anaplasma spp. in dairy ruminants in Jordan: high individual and herd-level seroprevalence and association with abortions by Mohammad M. Obaidat and Alaa E. Bani Salman in Journal of Veterinary Diagnostic Investigation</p
I. Development of a Cryogenic Shock Tube. II. Experimental Investigation of the Interaction of a Shock Wave with Liquid Helium and I and II
No full textI. Development of a cryogenic shock tube
A cryogenic shock tube has been developed as a tool for research in fluid mechanics and low temperature physics. The shock tube is designed to operate with the test section immersed in a cryogenic liquid. A unique diaphragm changing mechanism makes this shock tube an economical and practical device.
There are several advantages in operating a shock tube at cryogenic temperatures. Shock waves of very large Mach number can be produced. The flow field can be accurately calculated using ideal shock tube - perfect gas theory. Boundary layer effects are decreased so that long test times are possible.
The cases which have been studied are test gas temperatures of 300, 77, 4.2, and 2.3°K. Helium is used as both test and driver gas. The largest Mach numbers which have been observed range from 2.4 at 300°K to 32 at 2.3°K (several runs at 1.46°K have produced Mach 40 shocks). As the test gas temperature is decreased the observed Mach numbers approach those calculated using the ideal shock tube equation. The observed test times can be interpreted using laminar or turbulent boundary layer theory if the effects of shock formation distance and wall temperature rise are taken into account.
As a laboratory tool the cryogenic shock tube may be applied in many areas and modified for use in even more. Large Mach number shocks and large Reynolds number flows can be produced with this device. The rapid increase in temperature and pressure across a shock wave is useful for studies of sublimation, evaporation, or chemical reactions. Quantum mechanical effects in cryogenic materials, superconductors, or superfluid helium can also be investigated.
II. Experimental investigation of the interaction of a shock wave with liquid helium I and II
The flow field produced by a shock wave reflecting from a helium gas -liquid interface has been investigated using a new cryogenic shock tube. Incident and reflected shock waves have been observed in the gas; transmitted first and second sound shocks have been observed in the liquid. Wave diagrams have been constructed to compare the data to theoretical wave trajectories. Qualitative agreement between data and theory has been shown. Quantitative differences between data and theory indicate a need for further analysis of both the gas-liquid interface and the propagation of nonlinear waves in liquid helium.
This work is essentially a first step in the experimental investigation of a very complex nonequilibrium state. The well controlled jump in temperature and pressure across the incident shock wave provides unique initial conditions for the study of dynamic phenomena in superfluid helium.
The results clearly demonstrate the usefulness of the cryogenic shock tube as a research tool.</p
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