Catalogue Search | MBRL
Are you sure you want to remove the book from the shelf?
{{itemTitle}}
248
result(s) for
"المغناطيسية"
Sort by:
Adsorptive desulfurization of model oil using untreated, acid activated and magnetite nanoparticle loaded bentonite as adsorbent
The present research work focuses on a novel ultraclean desulfurization process of model oil by the adsorption method using untreated, acid activated and magnetite nanoparticle loaded bentonite as adsorbent. The parameters investigated are effect of contact time, adsorbent dose, initial dibenzothiophene (DBT) concentration and temperature. Experimental tests were conducted in batch process. Pseudo first and second order kinetic equations were used to examine the experimental data. It was found that pseudo second order kinetic equation described the data of the DBT adsorption onto all types of adsorbents very well. The isotherm data were analyzed using Langmuir and Freundlich isotherm models. The Langmuir isotherm model fits the data very well for the adsorption of DBT onto all three forms of adsorbents. The adsorption of DBT was also investigated at different adsorbent doses and was found that the percentage adsorption of DBT was increased with increasing the adsorbent dose, while the adsorption in mg/g was decreased with increasing the adsorbent dose. The prepared adsorbents were analyzed by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX) and X-ray diffraction (XRD).
Journal Article
فيزياء المجال والجهد الكهربائي
يتناول كتاب (فيزياء المجال والجهد الكهربائي) والذي قام بتأليفه (نصري علي عفونة) في حوالي (312) صفحة من القطع المتوسط موضوع (الفيزياء والمغناطيسية الكهربائية) مستعرضا المحتويات التالية : الفصل الأول : المجال والجهد الكهربائيان، الفصل الثاني : معدلات الحرارة النوعية، الفصل الثالث : هبوط النظرة الميكانيكية، الفصل الرابع : الحث الكهرومغناطيسي، الفصل الخامس : قوانين نيوتن في الحركة، الفصل السادس : القياس والمفاهيم الكمية، الفصل السابع : إيجاد تردد شوكة رنانة، الفصل الثامن : خواص أشعة الليزر، الفصل التاسع : تكميم الإشعاع، الفصل العاشر : الشفافية أو النفاذ، المراجع.
Book
Silica sulfuric acid-coated Fe3O4 nanoparticles as high reusable nanocatalyst for the oxidation of sulfides into sulfoxides, protection and deprotection of hydroxyl groups using HMDS and Ac2O
Oxidation of sulfides, acetylation of alcohols and phenols and selective trimethylsilylation of primary and secondary benzyl alcohols are carried out using silica sulfuric acid-coated Fe3O4 magnetic nanoparticles (SSA@MNPs) as a stable, efficient and magnetically recoverable nanocatalyst. Also, deprotection of silyl ethers was reported in ethanol at room temperature in the presence of SSA@MNPs as a magnetic nanocatalyst. The magnetic nanocatalyst was characterized by FT-IR spectroscopy, TGA, XRD and SEM techniques. The catalyst was easily separated with the assistance of an external magnetic field from the reaction mixture and reused for several consecutive runs without significant loss of its catalytic efficiency.
Journal Article
الكهربائية والمغناطيسية
هذا الكتاب يركزعلى الكهربائية الساكنة والتيارية اضافة الى موضوع المغناطسية واخيرا الكهربائية المتغيرة ويناقش أهم المواضيع التي يحتاج اليها طالب الدراسة الجامعية لهذا المادة علما بان طلبة التوجيهي يمكنهم الاستفادة من الكتاب في بعض الموضيع لاثراء معلوماتهم، فهذ الكتاب يخدم طلبة الجامعة وكتبت المعادلات باللغة الإنجليزية ويحتوي الكتاب على امثلة ورسومات توضيحية.
BOOK
Evaluation of iron oxide nanoparticles toxicity on liver cells of BALB-c rats
Background : Because of their unique magnetic properties, Fe3O4 nanoparticles (Fe3O4-NPs) have extensive applications in various biomedical aspects. Investigation of the possible adverse aspects of these particles has lagged far behind their fast growing application.
Objectives : The current study aimed to evaluate the toxicity of Fe3O4-NPs in the liver of mice.
Materials and Methods: In the present clinical trial, 90 BALB / c mice were randomly divided in 15 groups. Five control groups were fed by usual water and food. Five placebo groups were gavaged with physiological serum in doses of 25, 50, 75, 150, and 300 micrograms per gram of body weight (μg / gr). Five experimental groups were gavaged with Fe3O4-NPs, in doses of 25, 50, 75, 150, and 300 μg/gr. This pattern was repeated every other day, for 3 days. Then, the levels of liver enzymes [alanine transaminase (ALT), aspartate aminotransferase (AST) and alkaline phosphatase (ALP)] were compared between these groups. The histological alterations of livers were examined, as well. For statistical analysis, Kruskal-Wallis and Mann-Whitney, with type I Bonferroni correction, as post-hoc, have been used.
Results : The administration of 150 and 300 μg / gr doses of Fe3O4-NPs were associated with significant elevation in liver enzymes, compared to controls (P < 0.0001). Furthermore, the histopathological effects were observed in the liver tissue of these groups. However, in groups treated with lower doses of Fe3O4-NPs, no significant adverse effect was observed.
Conclusions : Based on our results, the administration of Fe3O4-NPs causes dose dependent adverse effects on liver
Journal Article
Growth of Wall-controlled MWCNTs by Magnetic Field Assisted Arc Discharge Plasma
Carbon nanotubes have long attracted great scientific interest because of their simplicity, ease of synthesis and unique properties. The novel properties of nanostructured carbon nanotubes including its high surface area, stiffness, tensile strength, thermal and electrical properties which become suitable for the application in the fields of energy storage, hydrogen storage, electrochemical supercapacitor, field-emitting devices, transistors, nanoprobes and sensors, composite material, templates, etc. In this study, carbon nanotubes were synthesized through arc discharge plasma with two different configurations, transverse and axial field, applied across arc plasma synthesis process to enable a much rapid rate growing of tubular carbon multi-walled carbon nanotubes (MWCNTs). TEM, FESEM, RAMAN, FTIR and XRD were used to investigate the morphology and structural evolution of the MWCNT samples produced with different synthesis environment. Introduction of magnetic field during the MWCNTs synthesized through arc discharge plasma technique has also been found to enhance the carbon nanotube growth, increase the high aspect ratio and its chemical stability, and shows potential for regulating the number of walls formed.
Journal Article
Luminescent, optical, magnetic and metamaterial behavior of cerium complexes
The complexes of cerium with nitrogen, oxygen and sulfur donor ligands were prepared by conventional method. These newly synthesized complexes were characterized by FTIR, UV–Vis, DART Mass, TGA, PXRD, SEM and TEM techniques. The magnetic studies were carried out by the vibrating sample magnetometer. The optical constants were measured by absorption and reflection spectra as a function of wavelength. The concentration dependence of refractive index and absorption was observed by the experimental method, which reveals that these parameters are affected by change in concentration. The optical band gap obtained from Tauc-plot indicates its probability to be a good semiconductor. The luminescence behavior of these cerium complexes was observed by the absorption and emission spectra and the emission life time was calculated by their life time spectra.
Journal Article