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Spectroscopic Studies On Some Methylphosphonothioic Diamides And Related Compounds
( Qatar University , 1987 , Article)A series of methylphosphonothioic diamides MrP (S) (NHR)., ( R = Mr, pr' and Bu') and some related compounds viz, PhP(S)(NHBu)a ,P1^P(S) ( NHCHJ'h ) arc preparpd and their infrared, n.m.r. and mass spectra arc- recorded. ... -
Spectroscopy in Corrosion Studies of Copper
( Qatar University , 1994 , Article)Spectrophotometric measurements were used to study corrosion of copper in aqueous solutions containing the four following depolarizers: K2Cr2O-j, K2S2O8, Fe(NH4)(SC>4)2 and CCI3COOH. A silica cell was used for the corrosion ... -
Spectroscopy of Polymer Nanocomposites
( Elsevier Inc. , 2016 , Book)Spectroscopy of Polymer Nanocomposites covers all aspects of the spectroscopic characterization of polymer nanocomposites. More than 25 spectroscopy characterization techniques - almost all used in materials science - are ... -
Spectroscopy-introducing the advantages and application areas in polymer nanocomposites
( Elsevier Inc. , 2016 , Book chapter)Spectroscopy is an inevitable tool of characterizing polymer nanocomposites. Various spectroscopic techniques unveil the nature of dispersion of nanoparticles within the matrix polymer, the interactions between filler and ... -
The Spectrum of Antibiotic Prescribing During COVID-19 Pandemic: A Systematic Literature Review
( Mary Ann Liebert , 2021 , Article Review)Objectives: Over the last decades, there has been a significant increase in antimicrobial prescribing and consumption associated with the development of patients’ adverse events and antimicrobial resistance (AMR) to the ... -
The spectrum of beta-thalassemia mutations in the 22 Arab countries: a systematic review
( Expert Reviews (formerly Future Drugs) / Taylor and Francis , 2020 , Article)To investigate the mutational spectrum in gene in Arab patients with Beta-Thalassemia (β-thal). Authors searched five databases (PubMed, Science Direct, Scopus, Web of Science, and Google Scholar) from the time of inception ... -
Spectrum of mutations of cystic fibrosis in the 22 Arab countries: A systematic review.
( Wiley , 2018 , Article)Cystic fibrosis (CF) is an autosomal recessive genetic disease caused by mutations in the CFTR gene, with various clinical manifestations that affect pulmonary, digestive, exocrine and male reproductive functions as well ... -
Spectrum of mutations of familial hypercholesterolemia in the 22 Arab countries.
( Elsevier , 2018 , Article)Familial hypercholesterolemia (FH) is an inherited genetic disorder of lipid metabolism characterized by a high serum LDL-cholesterol profile and xanthoma formation, and FH increases the risk of premature atherosclerosis ... -
The Spectrum of Mutations of Homocystinuria in the MENA Region
( MDPI , 2020 , Article Review)Homocystinuria is an inborn error of metabolism due to the deficiency in cystathionine beta-synthase (CBS) enzyme activity. It leads to the elevation of both homocysteine and methionine levels in the blood and urine. ... -
Spectrum-aggregating cognitive multi-antenna user with multiple primary users
( Institute of Electrical and Electronics Engineers Inc. , 2014 , Conference Paper)We investigate a cognitive radio scenario involving a single cognitive transmitter equipped with K antennas sharing the spectrum with M primary users (PUs) transmitting over orthogonal bands. Each terminal has a queue to ... -
Speech Command Recognition in Computationally Constrained Environments with a Quadratic Self-Organized Operational Layer
( Institute of Electrical and Electronics Engineers Inc. , 2021 , Conference Paper)Automatic classification of speech commands has revolutionized human computer interactions in robotic applications. However, employed recognition models usually follow the methodology of deep learning with complicated ... -
Speech community: a critique of Labov's definition
( Qatar University , 1991 , Article) -
Speed control of induction motor without rotational transducers
( IEEE , 1999 , Article)This paper describes a newly developed speed sensorless drive based on neural networks. A backpropagation neural network is used to provide real-time adaptive identification of the motor speed. The estimation objective is ... -
Speed perception and actual speed in a driving simulator and real-world: A validation study
( Elsevier Ltd , 2019 , Article)Background: Driving simulators have become an effective research tool in traffic safety, but the validity of results obtained in simulated environments remains a debated issue of high importance. Objective: The objective ... -
SPERM FACTORS AND EGG ACTIVATION The structure and function relationship of sperm PLCZ1
( BioScientifica , 2022 , Article Review)In 2002, sperm-specific phospholipase C zeta1 (PLCZ1) was discovered and through these 20 years, it has been established as the predominant sperm oocyte-activating factor. PLCZ1 cRNA expression or direct protein microinjection ... -
A spherical-plot solution to linking acceleration metrics with animal performance, state, behaviour and lifestyle
( BioMed Central , 2016 , Article)Background We are increasingly using recording devices with multiple sensors operating at high frequencies to produce large volumes of data which are problematic to interpret. A particularly challenging example comes from ... -
Spider silk fibers: Synthesis, characterization, and related biomedical applications
( Elsevier , 2019 , Book chapter)Compared to silkworm silks, spider silks (SS) are considered stronger, most elastic, and tougher biomaterials. Web-weaving spiders use impressive silks where the proteins in the silks can be described as virtually nondiverged. ... -
Spiderweb Honeycombs
( Elsevier Ltd. , 2015 , Article)Small and large deformation in-plane elastic response of a new class of hierarchical fractal-like honeycombs inspired by the topology of the “spiderweb” were investigated through analytical modeling, detailed numerical ... -
Spillovers between food and energy prices and structural breaks
( Elsevier B.V. , 2017 , Article)This paper estimates a bivariate VAR-GARCH(1,1) model to examine linkages between food and energy prices. The adopted framework is suitable to analyse both mean and volatility spillovers, and also allows for possible ... -
Spindle cell carcinoma of the breast: Rare cancer with potentially targetable biomarkers.
( Elsevier , 2019 , Conference Paper)Background Spindle cell carcinoma is a rare, metaplastic breast cancer (<1% of all breast carcinomas), with reportedly triple-negative (TNBC: ER-/PR-/Her2-) phenotype, associated with a marked resistance to conventional ...
