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Journal articles on the topic 'Porous polyethylene. eng'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Abdullah, Zulaikha, Sufizar Ahmad, Azzura Ismail, and Najeed Ahmed Khan. "Processing of Porous Stainless Steel by Compaction Method Using Egg Shell as Space Holder." Key Engineering Materials 791 (November 2018): 123–28. http://dx.doi.org/10.4028/www.scientific.net/kem.791.123.

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Development of lightweight materials becomes essential and has been applied for various structural and functional applications in industrial field since last decade. Porous metal can contribute to lightweight material with great mechanical, thermal and electrical properties. In this study, porous stainless steel was fabricated by using powder metallurgy technique and egg shell as a new potential space holder material. Stainless steel 316L was used as metal matrix powder, egg shells as space holder material, and polyethylene glycol (PEG) as binder to increase the green density of the preforms.

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2

Choi, Junyoung, Kwansoo Yang, Hyeon-Su Bae, et al. "Highly Stable Porous Polyimide Sponge as a Separator for Lithium-Metal Secondary Batteries." Nanomaterials 10, no. 10 (2020): 1976. http://dx.doi.org/10.3390/nano10101976.

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To inhibit Li-dendrite growth on lithium (Li)-metal electrodes, which causes capacity deterioration and safety issues in Li-ion batteries, we prepared a porous polyimide (PI) sponge using a solution-processable high internal-phase emulsion technique with a water-soluble PI precursor solution; the process is not only simple but also environmentally friendly. The prepared PI sponge was processed into porous PI separators and used for Li-metal electrodes. The physical properties (e.g., thermal stability, liquid electrolyte uptake, and ionic conductivity) of the porous PI separators and their effe

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3

Secer, Halil Ibrahim, Engin Gonul, and Yusuf Izci. "Surgical management and outcome of large orbitocranial osteomas." Journal of Neurosurgery 109, no. 3 (2008): 472–77. http://dx.doi.org/10.3171/jns/2008/109/9/0472.

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Object The goal of this study is to review the surgical management and outcome of patients who were treated for large orbitocranial osteomas at Gulhane Military Medical Academy over a period of 7 years. Methods Twenty-one patients with large orbitocranial osteomas were evaluated retrospectively. All patients were male and between 19 and 25 years old. Surgery was performed in all patients. The main surgical procedure was resection of the osteoma using orbitotomy and/or craniotomy followed by orbital reconstruction and cranioplasty. Cranioplasty was performed in 16 patients, using methyl methacr

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4

Huang, Lijuan, Ziru Jia, Hongying Liu, Xitian Pi, and Jiawen Zhou. "Design of a Sandwich Hierarchically Porous Membrane with Oxygen Supplement Function for Implantable Glucose Sensor." Applied Sciences 10, no. 8 (2020): 2848. http://dx.doi.org/10.3390/app10082848.

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This study aims to develop an oxygen regeneration layer sandwiched between multiple porous polyurethanes (PU) to improve the performance of implantable glucose sensors. Sensors were prepared by coating electrodes with platinum nanoparticles, Nafion, glucose oxidase and sandwich hierarchically porous membrane with an oxygen supplement function (SHPM-OS). The SHPM-OS consisted of a hierarchically porous structure synthesized by polyethylene glycol and PU and a catalase (Cat) layer that was coated between hierarchical membranes and used to balance the sensitivity and linearity of glucose sensors,

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Haselton, F. R., S. N. Mueller, R. E. Howell, E. M. Levine, and A. P. Fishman. "Chromatographic demonstration of reversible changes in endothelial permeability." Journal of Applied Physiology 67, no. 5 (1989): 2032–48. http://dx.doi.org/10.1152/jappl.1989.67.5.2032.

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This report describes a new in vitro method for measuring the diffusional permeability of an endothelial monolayer and its use in investigating the modulation of permeability by various agents, e.g., isoproterenol, propranolol, dibutyryl adenosine 3′,5′-cyclic monophosphate (cAMP), and cytochalasin D. To determine permeability, tracers of different molecular weights were applied simultaneously on a chromatography column containing confluent endothelial cells cultured on porous microcarrier beads. The Sangren-Sheppard model was used to determine the permeability of the endothelial monolayer fro

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6

Zikulnig, Johanna, Ali Roshanghias, Lukas Rauter, and Christina Hirschl. "Evaluation of the Sheet Resistance of Inkjet-Printed Ag-Layers on Flexible, Uncoated Paper Substrates Using Van-der-Pauw’s Method." Sensors 20, no. 8 (2020): 2398. http://dx.doi.org/10.3390/s20082398.

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With the growing significance of printed sensors on the electronics market, new demands on quality and reproducibility have arisen. While most printing processes on standard substrates (e.g., Polyethylene terephthalate (PET)) are well-defined, the printing on substrates with rather porous, fibrous and rough surfaces (e.g., uncoated paper) contains new challenges. Especially in the case of inkjet-printing and other deposition techniques that require low-viscous nanoparticle inks the solvents and deposition materials might be absorbed, inhibiting the formation of homogeneous conductive layers. A

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7

Dayyoub, Tarek, Aleksey Maksimkin, Fedor Senatov, Sergey Kaloshkin, Natalia Anisimova, and Mikhail Kiselevskiy. "A New Approach Based on Glued Multi-Ultra High Molecular Weight Polyethylene Forms to Fabricate Bone Replacement Products." Polymers 12, no. 11 (2020): 2545. http://dx.doi.org/10.3390/polym12112545.

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Three types of glue based on thiol-ene reaction, polyvinyl alcohol (PVA)/cellulose, and phenol formaldehyde were prepared and applied on modified ultra-high molecular weight polyethylene (UHMWPE) samples grafted by cellulose. In comparison with unmodified UHMWPE samples, T-peel tests on the modified and grafted UHMWPE films showed an increase in the peel strength values for the glues based on thiol-ene reaction, PVA/cellulose, and phenol formaldehyde by 40, 29, and 41 times, respectively. The maximum peel strength value of 0.62 Kg/cm was obtained for the glue based on phenol formaldehyde. Mech

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8

Marijianowski, M. M. H., G. D. Cipolla, D. M. Forestner, et al. "Histologic Consequences of Endoluminal Coronary Artery Hydrogel Polymer Paving." Microscopy and Microanalysis 3, S2 (1997): 315–16. http://dx.doi.org/10.1017/s1431927600008461.

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Coronary artery balloon catheter angioplasty for the treatment of obstructive atherosclerosis has an unacceptably high restenosis rate of about 40% within 6 months. Local delivery of pharmaceuticals and nucleotide-based compounds is under investigation as one means to decrease recurrence. Labeled molecules, when delivered to arterial angioplasty sites in aqueous solution using porous balloon catheters, are quickly lost from the tissue. Alternative strategies include drug encapsulation in microparticles, and implantation of drug-containing polymers. We tested the feasibility of a catheter-based

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9

Salerno, Simona, Maria Penelope De Santo, Enrico Drioli, and Loredana De Bartolo. "Nano- and Micro-Porous Chitosan Membranes for Human Epidermal Stratification and Differentiation." Membranes 11, no. 6 (2021): 394. http://dx.doi.org/10.3390/membranes11060394.

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The creation of partial or complete human epidermis represents a critical aspect and the major challenge of skin tissue engineering. This work was aimed at investigating the effect of nano- and micro-structured CHT membranes on human keratinocyte stratification and differentiation. To this end, nanoporous and microporous membranes of chitosan (CHT) were prepared by phase inversion technique tailoring the operational parameters in order to obtain nano- and micro-structured flat membranes with specific surface properties. Microporous structures with different mean pore diameters were created by

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10

Shin, Eun Ho, and Kyoung Ho Moon. "Cementless total hip arthroplasty in young patients under the age of 30: a minimum 10-year follow-up." HIP International 28, no. 5 (2018): 507–13. http://dx.doi.org/10.1177/1120700017752339.

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Purpose: The purpose of this study was to evaluate the clinical and radiologic outcomes of young patients (under the age of 30) who received a total hip arthroplasty (THA) and in whom patients had been followed for more than 10 years. Materials and methods: This retrospective study was conducted for 51 hips (44 patients) that had undergone THA. The mean age for the index operation was 25.71 years, and the mean follow-up period was 13.7 years. Clinical outcomes were evaluated by Harris hip score (HHS), activity level, and complications. Radiographic evaluations were assessed according to osteol

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11

Rumaizah, Che Zulkifli, Azaman Fazureen, Razali Mohd Hasmizam, Ali Asmadi, and Muhamad Nor Mohd Al Amin. "Properties and Filtration Performance of Porous Clay Membrane Produced Using Sawdust as Pore Forming Agent." Key Engineering Materials 821 (September 2019): 337–42. http://dx.doi.org/10.4028/www.scientific.net/kem.821.337.

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This study investigated the effect of sawdust at 0, 10, 20, 30 and 40 wt% towards physical properties and filtration efficiency of porous clay membrane. Sawdust in various quantities was added into water containing clay, polyethylene glycol and sodium silicate and then stirred to form homogenized slurry. The slurry then was casted into Plaster of Paris (PoP) mould. The green body was cut into required sizes, dried and sintered in furnace at 1000 °C. The porosity and density of porous clay was determined by Archimedes principle, while morphology was observed by Hitachi Tabletop Scanning Electro

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12

Cox, Jacob T., Jing Tian, Shannath Merbs, and Nicholas R. Mahoney. "Blood Collection within the Maxillary Sinus following Orbital Fracture Repair: The Impact of Mesh Implants and Drains." Craniomaxillofacial Trauma & Reconstruction 12, no. 3 (2019): 167–73. http://dx.doi.org/10.1055/s-0038-1676636.

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This article aimed to assess the effects of (1) mesh (e.g., uncoated anatomic titanium plates) versus non-mesh (e.g., porous polyethylene-coated titanium sheets) implant materials and (2) drain placement on the accumulation of blood within the maxillary sinus following surgical repair of orbital floor fractures. Ninety-two patients who received orbital floor fracture repair between 2008 and 2014 were selected, with equal case numbers between categories: (1) non-mesh implant, without drain; (2) non-mesh implant, with drain; (3) mesh implant, without drain; and (4) mesh implant, with drain. Lesi

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13

Desgranges, P., D. Barritault, J. P. Caruelle, and M. Tardieu. "Transmural Endothelialization of Vascular Prostheses is Regulated in Vitro by Fibroblast Growth Factor 2 and Heparan-Like Molecule." International Journal of Artificial Organs 20, no. 10 (1997): 589–98. http://dx.doi.org/10.1177/039139889702001009.

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Endothelialization of vascular prostheses may result from transmural migration of endothelial cells. Angiogenesis is controlled by growth factors like Fibroblast Growth Factor 2 (FGF2) and regulators like heparan-like molecules. To that end, we used heparan-like molecules named RGTA for ReGeneraTing Agent. The RGTA11 used was a chemically derived dextran obtained by successive substitutions with carboxymethyl, benzylamide, and benzylamide sulfonate groups on glucose residues. This agent was further selected for its ability to bind, stabilize and protect FGF2. We defined firstly the angiogenic

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14

Buechel, Frederick F., Frederick F. Buechel, and Michael J. Pappas. "Ten-Year Evaluation of Cementless Buechel-Pappas Meniscal Bearing Total Ankle Replacement." Foot & Ankle International 24, no. 6 (2003): 462–72. http://dx.doi.org/10.1177/107110070302400603.

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A porous-coated, cementless, congruent-contact, three-piece, meniscal-bearing total ankle replacement was developed and used clinically over a 2- to 10-year period for patients with disabling ankle arthritis. Polished titanium-nitride ceramic-coated Ti6Al4V tibial and talar components with a deep-sulcus trochlear groove and two lateral fixation fins for the talar onlay component were used. The ultra-high-molecular-weight polyethylene (UHMWPe) meniscal bearing congruently conformed to the flat upper tibial component surface and the deep sulcus and cylindrical geometry of the lower talar compone

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15

Elliott, J. C., F. R. G. Bollet-Quivogne, P. Anderson, S. E. P. Dowker, R. M. Wilson, and G. R. Davis. "Acidic demineralization of apatites studied by scanning X-ray microradiography and microtomography." Mineralogical Magazine 69, no. 5 (2005): 643–52. http://dx.doi.org/10.1180/0026461056950276.

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AbstractThe mineral in bones and teeth is an impure form of hydroxylapatite (HAP), the principal impurity being 2—5 wt.% carbonate. This mineral dissolves during remodelling of bone and also in dental caries as a result of the action of acids produced by osteoclasts and by bacteria, respectively. In enamel, demineralization proceeds with preferential loss of carbonate relative to phosphate. Surprisingly, in the early stages, the demineralization is subsurface. In order to facilitate the understanding of physical chemical aspects of these processes, we have undertaken studies of demineralizatio

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16

Sapozhnikov, Ph V., A. I. Salimon, A. M. Korsunsky, et al. "Features of formation of colonial settlements of marine benthic diatoms on the surface of synthetic polymer." Marine Biological Journal 5, no. 2 (2020): 88–104. http://dx.doi.org/10.21072/mbj.2020.05.2.08.

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The topic of interactions between plastic and natural communities is now more relevant than ever before. Gradual accumulation of artificial polymer products and their fragments in the natural environment has reached a level at which it is already impossible to ignore the affect of these materials on living organisms. First and foremost, microorganism colonies inhabiting different biotopes, both aquatic and terrestrial, have been affected. These species are at the front-end of interaction with plastic, including those present in marine ecosystems. Nevertheless, in order to understand these proc

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17

Song, Weibing, Hongyu Lu, Wenlong Zhao, et al. "Control of Shape and Size in Iron Fluoride Porous Sub-Microspheres: Consequences for Steric Hindrance Interaction." Frontiers in Nanotechnology 3 (September 7, 2021). http://dx.doi.org/10.3389/fnano.2021.710348.

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Iron-based fluorides are promising alternates for advanced sodium-free battery cathodes due to their large theoretical capacity. However, the rational structural control on the iron-based fluorides toward high-performance batteries is still challenging. To this end, a controllable porous structure on FeF3·0.33H2O sub-microspheres is achieved by a polyethylene glycol (PEG)-assisted hydrothermal method via adjusting the volume of PEG-400. Experimental and molecular dynamic results verify that the formation of small amethyst-like sub-microspheres is mainly ascribed to the steric hindrance reactio

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18

Bajon, R., S. Balaji, and S. M. Guo. "Electrospun Nafion Nanofiber for Proton Exchange Membrane Fuel Cell Application." Journal of Fuel Cell Science and Technology 6, no. 3 (2009). http://dx.doi.org/10.1115/1.3005577.

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Proton exchange membrane fuel cells (PEMFCs) are attractive power plants for use in many applications, including portable power sources, electric vehicles, and on-site combined power/heat plants, due to the inherently high efficiency and low emission. The membrane electrode assembly (MEA) is the key component of a PEMFC. A standard five layer MEA consists of a proton exchange membrane, two catalyst layers, and two gas diffusion layers. The most commonly used electrolyte material is proton conductive perfluorinated sulfonic acid membrane, such as Nafion. Hydrogen is oxidized at the anode/electr

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19

Demchuk, M. B., N. P. Darzuli, T. A. Hroshovyi та S. V. Demchuk. "СУЧАСНИЙ СТАН СТВОРЕННЯ, ВИРОБНИЦТВА ТА ДОСЛІДЖЕННЯ ТАБЛЕТОВАНИХ ЛІКАРСЬКИХ ПРЕПАРАТІВ Повідомлення 20. Характеристика процесу створення та дослідження гастроретентивних систем доставки лікарських речовин." Фармацевтичний часопис, № 4 (19 січня 2016). http://dx.doi.org/10.11603/2312-0967.2015.4.5563.

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<p align="center"><strong>MODERN STATE OF CREATION, PRODUCTION AND RESEARCH OF DRUGS</strong></p><p align="center"><strong>M.</strong><strong>B. </strong><strong>Demchuk, </strong><strong>N.</strong><strong>P. </strong><strong>Darzuli, </strong><strong>T.</strong><strong>A. </strong><strong>Hroshovyi, S.V. Demchuk<sup>1</sup></strong></p><p align="center">TernopilStateMedicalUniversityby I.Ya. Horbachevsky</p><p align="center

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