Aida A. Salman

Al-Azhar University

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Electrical insulating properties of some varnish compositions

Pigment & Resin Technology (1989)

Aida A. Salman I. M. Elanwar Masturah Mohamed

The dielectric constant (E′), dielectric loss (E″) and power factor (tan §) were measured for various excess hydroxyl content resins (polyesteramide, alkyd/polyesteramide and alkyd resins) and also for their corresponding dry films. Measurements were conducted within the frequency band 105 to 107 Hz and temperature range 20–50°C. The various parameters affecting the dielectric behaviour of resin varnishes and their dry films are discussed. Also the effect of ageing at 110°C upon the dielectric behaviour of dry films is another parameter taken into consideration.

Alkyd

Dielectric loss

Loss factor

10.1108/eb042665

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Citations (1)

Synthesis and Structural Characterization of Lithiated and Delithiated LiCoO2 Using Different Chelating Agents

Egyptian Journal of Chemistry (2010)

A. Abdelghany Ali E. Eid Aida A. Salman Carmen M. Sharaby Suzan Abdel-Hamied

was synthesized by sol-gel method using ……succinic, malic and tartaric acid as chelating agent. The delithiated Li

Characterization

10.21608/ejchem.2010.1232

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Citations (2)

STUDIES ON CYCLODIPHOSPHAZANES: SOME REACTIONS OF ACTIVE-METHYLENE GROUP CONTAINING COMPOUNDS

Phosphorous and Sulfur and the Related Elements (1988)

Aida A. Salman Ibrahim Abdellah A. N. El-khazandar Zeinab H. Abd El–Wahab

Abstract Interaction of hexachlorocyclodiphosphazanes (1a-h) with ethyl-acetoacetate, sodium ethylaceto-acetate and benzyl chloride are described. The structure of the obtained cyclodipnosphazane derivatives (II-IV) were proposed on the basis of microanalytical data, ir, uv, 1H n.m.r and mass spectra. The mechanism of the reaction is also discussed.

Methylene

Ethyl acetoacetate

Benzyl chloride

10.1080/03086648808072887

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Citations (6)

[Use of the Palmaz-Schatz stent in the acute phase of myocardial infarction in a patient with cardiogenic shock].

PubMed (1996)

Viana Aw Alberto Aiolfi Mangione Ja Cristovão Sa Zuliani Mf

A 56-year-old female patient underwent myocardial revascularization with three saphenous bypass grafts. One month after surgery she had an acute myocardial infarction with cardiogenic shock and was treated with a Palmaz-Schatz stent implantation in the left main coronary artery (that was occluded) and a PTCA of the graft to the right coronary artery. The in hospital outcome was uneventful and angiographic study after six months showed no restenosis and important improvement in the left ventricular function.

Myocardial Revascularization

Source

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Citations (0)

A study of a newly synthesized ligand and its metal complexes in bulk and nano size and metal uptake efficiency

Applied Organometallic Chemistry (2020)

Rania H. Taha Z. A. El‐Shafiey Aida A. Salman Mai Mansour

A newly synthesized ligand derived from 2‐amino thiophenol and benzoic anhydride and its Co(II), Cd(II), La(III) (in bulk and nano size), and Gd(III) complexes was investigated and characterized. The maximum elimination capacity of the newly synthesized ligand was investigated towards the removal of Co(II), Cd(II), La(III), and Gd(III) ions from aqueous solutions. It was found that the ligand has the best removal ability for Cd(II) metal of 98.66% at a concentration of 0.03 mg/L.

Thiophenol

Benzoic acid

10.1002/aoc.5792

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Citations (7)

[Echocardiographic relation criteria. A new selection method for mitral valvotomy with balloon catheter].

PubMed (1993)

Mangione Ja MA. Lopes Aida A. Salman Alvarez Ge Del Castillo Jm

To find out new subjects that could be useful to select patients between 9 and 12 points, according to Block's Criteria, to mitral balloon valvotomy.One hundred and forty patients underwent mitral balloon valvotomy. Among them, 29 (21%) had between 9 and 12 points. These patients were divided into two groups: group A-patients with mitral valve area > or = 1.5cm2, immediately after balloon valvotomy and in the follow-up period; group B-patients with mitral valve area < 1.5cm2 immediately after or during the follow-up period, patients with severe mitral regurgitation after the procedure and patients who died in the follow-up period. All patients were analyzed by echocardiographic relation criteria (ERC): calcification + subvalvar disease/thickness + mobility. Each one was quantified from 1 to 4 points according to the degree of valvular disease.Group A was composed of 17 (51%) and group B 12 (41%) patients. The variables age, sex, previous mitral commissurotomy and atrial fibrillation did not show difference between groups. In group A mitral valve area (cm2) increased from 1.15 +/- 0.25 to 1.97 +/- 0.26 (p < 0.00001) keeping stable during the follow-up period. In group B percutaneous mitral balloon valvotomy resulted in an increase from 1.26 +/- 0.19 to 1.77 +/- 0.16 (p < 0.00001), however, there was an important decrease in the follow-up period to 1.34 +/- 0.15 (p < 0.00001). The ERC showed that all group A patients had a relation < 1. However, in group B, 10 patients (83%), the relation was > or = 1, and in only 2 patients (17%) was < 1 (p < 0.00001).The group of patients between 9 and 12 points in the Block's criteria is heterogenic, therefore, each case might be evaluated individually and the echocardiographic relation criteria should be used in order to select these patients to the procedure.

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The improvement of cellulosic fabrics dyeability by microw aves

Journal of Agricultural Research (2010)

Aida A. Salman A.J. Al-Hindawi Ramadan Ramadan R.G. Abd el-hady

Cellulosic ethanol

Source

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Citations (0)

Removal of fluoride from aqueous solution using Amberlite-IRA-aluminum sorbent nanoexchanger

Desalination and Water Treatment (2017)

Mostafa M. Emara Aida A. Salman Nesrine M.R. Mahmoud Samah A. Fattah

In the present study, aluminum-modified anionic exchanger nanoparticles were synthesized by introducing Al(III) ions onto the functional sites of the polymeric anion exchanger Amberlite-402.The modified anionic exchanger gathered the favorable sorption properties of inorganic nanoparticles with the excellent hydraulic characteristics of polymeric beads.Hazardous persistent fluoride ions in water were removed by the new sorbent using both batch and fixed-bed column techniques.Different parameters that affect the adsorption process such as initial concentration, pH, and temperature have been investigated.It is found that the adsorption of fluoride ions is efficient in a wide range of pH.However, maximum removal is observed at pH = 3.0.In addition, the adsorption capacity is slightly affected by temperature and is increased by decreasing the temperature from 308 to 288 K to reach 80.33 mg g -1 .The coexisting ions chloride and nitrate were also studied.Their existence had a significant effect on reducing the efficiency of fluoride removal from 24.5 to 17.5 mg g -1 and 15.0 mg g -1 , respectively.The study showed that the adsorption process favored the Langmuir adsorption model.Thermodynamic parameters were also calculated and positive DG° values were related to a nonspontaneous nature of the adsorption.Fixed-bed column experiments were carried out for investigating the following parameters: influent fluoride concentrations, bed depths, and various flow rates.The breakthrough time increased either with increasing flow rate, decreasing bed depth, or decreasing influent fluoride concentration.The X-ray diffraction, energy dispersive X-ray spectroscopy, and scanning electron microscope studies were carried out for the characterization of the new sorbent.These studies confirmed that aluminum ions are successfully loaded onto the surface of Amberlite-402.This study proves that novel Amberlite-IRA-Al is more efficient than other defluoridation techniques.

Amberlite

10.5004/dwt.2017.21032

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Citations (2)

Influence of aggressive environmental impacts on clean, lightweight bricks made from cement kiln dust and grated polystyrene

Case Studies in Construction Materials (2021)

Hosam M. Saleh Aida A. Salman Abeer A. Faheim Abeer M. El-Sayed

Cementitious bricks of low density were produced from a novel composite material consisting of four different surplus products: iron slag, cement kiln dust, ground waste glass and spent polystyrene in combination with Portland cement. The new composite material was thoroughly characterized by mechanical testing, and its durability when exposed to heavy weathering conditions (water penetration and frosting) was examined. The suitability of the new composites as construction materials was validated by physical and mechanical characterizations. Composite specimens containing 5% iron slag, 10% Portland cement, 10% ground waste glass and 3% spent polystyrene in a cement kiln dust matrix were exposed for long periods to repeated freezing/thawing cycles, and to immersion in water of different origin for up to three months. Compressive strength, water absorption, porosity and density of the specimens were studied after exposure to these challenging conditions, while microstructural changes after exposure were examined via scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and spectroscopic analysis (FT-IR and XRD). As major outcome, compressive strength and indirect tensile strength of tested specimens increased during 30 days of freezing/thawing to 3.63 MPa and 2.13 kPa, respectively, and to 3.31 MPa and 1.94 kPa, respectively, during 60 days of immersion in aqueous medium mimicking acidic rain. This indicates that the new composite material, which can be produced at lower cost compared to current construction materials, not only revealed high resistance against the harsh environmental conditions exposed to, but even improved mechanical properties in comparison to data measured prior to exposure.

Cement kiln

10.1016/j.cscm.2021.e00759

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Citations (25)

Radiochemical technique as a tool for determination and characterisation of El Sela ore grade uranium deposits

International Journal of Environmental & Analytical Chemistry (2020)

Sahar A. Okasha Abeer A. Faheim Mohamed H. E. Monged Mahmoud R. Khattab Neveen S. Abed

The present study is an application of a radiochemical procedure for the determination of 238U, 235U and 234U as well as uranium isotopic ratios in El Sela ore grade samples that located at the Southeastern Desert of Egypt. This procedure is consisting of several steps include sample preparation, chemical separation and source preparation followed by counting using alpha-particle spectrometry technique. Radiochemical determination of various uranium isotopes contents indicated that El Sela uranium deposits are considered as a recent deposit where there was a large difference between radiochemically and radiometrically determined uranium. The measured 234U/238U activity ratios for most samples were approximately unity, indicating that secular radioactive equilibrium was established between 238U and 234U in the El Sela mineralised rocks. On the other hand, 238U and 234U might be equally leached due to the effect of rock-water interactions during the pluvial time by the action of surficial or underground water. The 238U/235U activity ratios of the studied mineralised granites were significantly shifted from the natural ratio 21.7, indicating that the redox conditions and alteration processes played an important role in the fractionation of 238U from 235U. The values of 234U/235U ratios in the studied granites varied between 23.08 and 34.70 in different samples, suggesting 235U migration out due to the prevailing conditions.

Isotopes of uranium

Uranium ore

Natural uranium

10.1080/03067319.2020.1863388

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Citations (19)