64 research outputs found
Corrigendum: Anemia detection through non-invasive analysis of lip mucosa images
No full textIn the published article, there was an error in the author list. The new requested author order is: Shekhar Mahmud1, Turker Berk Donmez2, Mohammed Mansour3*, Mustafa Kutlu3 and Chris Freeman41 Department of Systems Engineering, Military Technological College, Muscat, Oman 2 Department of Biomedical Engineering, Sakarya University of Applied Sciences, Serdivan, Sakarya, Türkiye 3 Department of Mechatronics Engineering, Sakarya University of Applied Sciences, Serdivan, Sakarya, Türkiye 4 Electronics and Computer Sciences, University of Southampton, Southampton, United Kingdom The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated. Copyright © 2023 Mahmud, Donmez, Mansour, Kutlu and Freeman
Effects of the post-modification using bismuth chelate (BisBAL) on the anti-biofouling and performance properties of flat-sheet microfiltration membranes
No full textMembrane biofouling defined as the attachment and growth of microorganisms on a membrane surface has been a major problem of membrane bioreactor (MBR) technology. The anti-biofouling properties like the inhibition of bacterial adhesion of a membrane are quite significant for a long-term MBR operation. Surface modification is thought to be one of the most common approaches to improve this property. In this study, polymeric microfiltration membranes were modified by adsorption BisBAL, which is a synthesized chelate using bismuth and have a high anti-bacterial effect on various microorganisms, on the membrane surface using dip coating (DC), spin coating (SC), and low pressure-treated coating (LPtC). The purpose was to increase the surface hydrophilicity, change the surface charge, and gain the surface an anti-bacterial characteristic. It was found that the higher adsorption time, lower feed flow rate and higher spinning velocity, and pressure application increased the efficiency of the process during DC, SC, and LPtC, respectively. Furthermore, improved strategies allow the adsorption of BisBAL on the membrane surface and modified membranes has strong resistance to biofouling. Since modification resulted in a decrease in pore fouling and irreversible fouling for all type of membranes, these membranes can be novel alternatives for energy-saving MBR operation
Ottoman-Turkish heritage narratives in museum practice: from Empire to Republic
No full textIn the decades surrounding the turn of the 20th century the world witnessed the collapse of once great empires and the rise of independent nation-states. With this reconception of the political world order there was an impact in the development of heritage discourses. Museums, archaeology, and collecting were mobilized for the purpose of creating a cohesive state identity. One region that experienced this tremendous social and political change was Asia Minor - that part of the Ottoman Empire that would become the Turkish Republic. How is this radical shift in political ideology reflected in the choices of museum practitioners of the time, and how do these represent a shift in desired representation of Turkish identity? This thesis explores this central question through a comparative analysis of collections at the Istanbul Archaeology Museums and the Anatolian Civilizations Museum, in Ankara. By examining each museums’ early history and the way they have chosen, grouped, and arranged artifacts for display, this thesis looks at the underlying motivations which contributed to particular heritage narratives in each period.M.A.Includes bibliographical reference
Biomimetic Approaches for Membrane Technologies
No full textMembrane technology is the dominant process in water treatment. However, the operation cost of membranes cannot be decreased unless the amount of fouling, the "Achilles heel" of membranes, and energy consumed are cut. The high energy requirements in commercial nanofiltration, reverse osmosis and forward osmosis technologies lead researchers to develop new membrane designs having high flux values with high salt rejection values. The purpose of this review is to present the inadequacies of the membrane processes by considering studies related to fouling and energy minimization. In this respect, lipid bilayers, block copolymers, aquaporin Z proteins and aligned carbon nanotubes can be the base to build biomimetic membranes. Such studies are summarized due to their remarkable properties in fouling control. Furthermore, the review describes the membrane design strategies and points the limitations hindering commercialization. Additionally, it is hoped that this review will trigger further needed studies
Hollow fiber nanofiltration membranes: A comparative review of interfacial polymerization and phase inversion fabrication methods
No full textNanofiltration membranes for salt and dye filtration: effect of membrane properties on performances
No full textIn this study, commercial nanofiltration membranes (Toray, NF 270, Desal 5 L) were characterized by FT-IR spectroscopy, scanning electron microscope, optical profilometry, contact angle, mechanical strength and zeta potential measurements. Filtration performance tests were conducted with distilled water, MgSO4 solution and synthetic dye solutions, respectively. Among three commercial membranes, Toray membrane was thought to be better one. Additional experiments have been carried out for a more detailed characterization of the selected membrane. Therefore, firstly, flux and removal efficiency was monitored by using dye solutions at different pH values, and then experiments were carried out to observe the effect of different temperatures. Also, another filtration test with NaCl solution were performed for Toray membrane. As the main purpose of this study, it was aimed to establish a significant correlation between the structural properties of membranes and their performances. In the light of the results obtained, it has been observed that the contact angle, mechanical strength and surface roughness values of the membrane significantly affect the membrane performance. It was concluded that the most important parameter in dye removal is the zeta potential. As a result of this work, a data set of commercial membranes were created available to all membrane users
Effect of wetting agent on the dye filtration performance of ultrafiltration membrane
No full textIn this study, the wet phase inversion method was used for fabrication of the flat sheet ultrafiltration (UF) membranes. Three different polymer types and two different wetting agents were used for the fabrication. The effect of polymer types and wetting agents were investigated on the structural and dye performance of casted membranes. Two different synthetic dyes, 100 ppm Setazol Red and 100 ppm Setazol Blue, were used for the performance test. Viscosity, contact angle, and molecular weight cut off (MWCO) of casted membranes were measured and an electro kinetic analyzer, dynamic mechanical analyzer (DMA) and scanning electron microscope (SEM) were used to determine the structural properties. While the highest water and dye permeability were obtained with PES-PEG membrane, PSf-plain membrane gave the highest removal efficiency for Setazol Red and Setazol Blue dyes, which was found to be 78.33% and 82.52%, respectively, in the conditions of neutral pH and ambient temperature. Addition of PVP and PEG wetting agents improved the structural properties and permeability of membranes, but the dye removal was decreased as against plain ones. As the retention of PEG and PVP-based PSf and PES membrane was calculated at an average of 50%, they could be used for dye retention separately or could be a candidate as a pretreatment membrane prior to nanofiltration or reverse osmosis to make their lifetime longer
Foulant and chemical cleaning analysis of ultrafiltration membrane used in landfill leachate treatment
No full textProgress on reinforced braided hollow fiber membranes in separation technologies: A review
No full textAdvantages of hollow fiber membranes include high specific area, possibility of back flushing, and lower pretreatment and maintenance requirements. Aggressive back flushing or airflow, however, can damage hollow fibers. Reinforced braided hollow fibers offer a solution for increasing mechanical strength and extending useful lifetime of hollow fiber membranes. The present review discusses the effects of support layer, spinneret design, polymer type and production speed on properties of reinforced braided hollow fiber membranes. The review concludes with a summary of applications enabled by such mechanical reinforcement
Experimental and theoretical studies of 4-[(4-methyl-5-phenyl-4h1,2,4-tiıazol-3-yl)sulfanyl]benzene-1,2-dicarbonitrile
No full textAKCAY, Hakki Turker/0000-0002-8502-9608; Vazquez-Lopez, Ezequiel M./0000-0002-6012-0931; Hokelek, Tuncer/0000-0002-8602-4382In this study, 4-[(4-methy1-5-pheny1-4H-1,2,4-triazol-3-yl)sulfanyl]benzene-1,2-dicarbonitrile was synthesized and its molecular structure was characterized by means of FT-IR. and X-ray diffraction methods. the crystal is monoclinic and belongs to the P21/n space group. There are three weak intermolecular C-H...N type hydrogen bonds in the molecular structure. the geometrical parameters, vibration frequencies, HOMO LUMO energies, and molecular electrostatic potential (MEP) map of the compound (3) in ground state were calculated by using density functional theory (DFT/B3LYP) with the 6-311G(d) basis set. Calculated geometrical parameters were compared with X-ray diffraction geometric parameters. on the other hand, theoretical and experimental FT-IR results were also compared.Higher Education CouncilThe author would like to thank the Higher Education Council for supporting this study within international research
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