422 research outputs found
Ordinal Regression Coefficients for the Hama Al-Bayati Question.
No full text<p>*V = version, e.g., V1 = version 1</p><p>Ordinal Regression Coefficients for the Hama Al-Bayati Question.</p
Adipose-derived stem cells could sense the nano-scale cues as myogenic-differentiating factors
No full textMicroenvironmental cues, such as surface topography and substrate stiffness, may affect stem cells adhesion, morphology, alignment, proliferation and differentiation. Adipose derived stem cells (ASCs) have attracted considerable interest in regenerative medicine due to their easy isolation, extensive in vitro expandability and ability to differentiate along a number of different tissue-specific lineages. The aim of this work was to investigate ASCs adhesion, alignment and differentiation into myogenic lineage on nanofibrous polymeric scaffolds with anisotropic topography. Nanostructured scaffolds with randomized or parallel fibers were fabricated by electrospinning using polycaprolactone (PCL) and the polycarbonate-urethane ChronoFlex AL 80A (CFAL). Cells expressed myosin (fast skeletal) and tropomyosin in all surface topographies 7 days after seeding but myotube formation was only observed on CFAL scaffolds and only few myotubes were formed on PCL scaffolds. The different cell behavior could be ascribed to two main parameters: fibers dimensions and fibers orientation of the substrates that could result in a better myotube formation on CFAL scaffolds
Effect of additive materials to concrete on γ-ray absorption coefficient
No full textGamma-ray absorption coefficient in some shielding materials, such as, iron, brass, lead and concrete, is measured experimentally in the present study using a Cs-137 source of energy 0.662 MeV.
Two types of concrete samples are used , ordinary concrete and concrete with additive fractional weights of iron or brass or lead materials. Experimental measurements are carried out for single-layer absorbers. The dependence of gamma-ray absorption coefficient on the atomic number, and density of the absorber material is taken into account. The results showed that for concrete, the value of gamma-ray absorption coefficient can be increased if a material of high atomic number ( or density ) is added to it .Author Affiliation: A A Al-Bayati
1.Department of Physics, College of Science, University of Baghdad,
Baghdad, Iraq
E-mail : [email protected] of Physics, College of Science, University of Baghdad,
Baghdad, Ira
Numerical wind tunnel tests of an open data IPC-VAWT
No full textThe evaluation of the performance of a Darrieus Vertical Axis Wind Turbine is performed using an actuator line code. This allows to investigate the aerodynamics of the turbine and the interaction with the boundary conditions. Blade Pitch control, tip-effects modelling and blockage effects in an open-jet wind tunnel test section are studied and investigated. Pitch control allows to enhance the power extraction, tip effects allow to generate a more realistic model, while the modelling of the open-jet test section allows to validate the numerical approach on experimental data intrinsically characterized by not negligible blockage effects
sj-docx-1-ine-10.1177_15910199221083100 - Supplemental material for Characterizing Fast and Slow Progressors in Anterior Circulation Large Vessel Occlusion Strokes
No full textSupplemental material, sj-docx-1-ine-10.1177_15910199221083100 for Characterizing Fast and Slow Progressors in Anterior Circulation Large Vessel Occlusion Strokes by Mahmoud H Mohammaden, Diogo C Haussen, Leonardo Pisani, Alhamza R Al-Bayati, Nirav R Bhatt, Dinesh V Jillella, Nicolas A Bianchi, Samir R Belagaje, Michael R Frankel and Raul G Nogueira in Interventional Neuroradiology</p
”den Andre” i lärarutbildningen – En studie om den rasifierade svenska studentens villkor i globaliseringens tid
No full textAbstract
Title: ”the Other” in teacher education – A study of the racialized Swedish student’s conditions in the era of globalization
Language: Swedish with a summary in English
Author: Zahra Bayati
ISBN: 978-91-7346-787-2 (tryckt)
ISBN: 978-91-7346-788-9 (pdf)
ISSN: 0436-1121
Keywords: racial segregation, inclusion, exclusion, teacher education, non-European background, critical whiteness theory, postcolonial theory, participatory research, silence
In this dissertation, the experiences of various agents in Swedish teacher education are ex¬am¬ined in relation to its multi-ethnic composition. The purpose is to study how the racial¬ized “Other” is constructed, reconstructed or transcended in teacher education in light of contemporary and colonial history. How agents from teacher education deal with dis¬courses about the racialized “Other” in their educational practices, is also a point of study.
Participatory research and standpoint theory are the theoretical and methodological starting points for choice of method, where research circle and qualitative research inter-view are used for the empirical studies. Seven students with “non-European” background and one with mixed background were interviewed, while the research circle included six teacher educators and a student counselor. Also interviewed were three training placement tutors and language tutors, and with my own active participation in the research circle, the study had a total of 21 participants. For analysis of the study’s results, postcolonial theory and critical whiteness theory were used as theoretical framework.
The results show that there are silences at the social, structural and actor level sur-rounding the pluralistic composition of teacher education. This includes silences surround¬ing the non-white/racialized Swedish students’ study conditions, students who, contrary to their expectations, experience exclusion and discrimination in teacher education – something they themselves explain as originating from the stereotypes that exist about them in society and education. The study also shows that the racialized segregation in society is reconstructed in education, for example in group work or work placements. However, the study also reveals resistance – agents with different ethnic backgrounds who acknowledge the existence of institutional, inequality creating and discriminatory discourses, and fight them.
The conclusion is that teacher education must actively counteract the monocultural and Eurocentric knowledge creation that dominates the system, so as to live up to the democ¬racy- and equality-promoting claims in its policy documents. What is required are pro¬gressive reforms of the educational organization and its content, with a view to a teacher training where a heterogeneous group of students can feel at home. A teacher training where students are properly trained for future teaching assignments in a globalized society
Micro-structured patches for dermal regeneration obtained via electrophoretic replica deposition
No full textArtificial substrates supporting the healing of skin wounds require specific structural and chemical architectures that promote a recapitulation of the complexity of the native organ. Bottom-up fabrication technologies are emerging as effective strategies to fine tune biochemical, morphological, and structural features intended for regenerative applications. Here, we proposed an electrophoretic replica deposition (EPrD) approach to realize chitosan three-dimensional structures specifically designed to treat patients with serious cutaneous damages or losses. The EPrD process has been optimized to consistently obtain random porosity vs. hierarchical lattice structures, showing mechanical properties in the range of skin tissue (E = 0.2-20 MPa). The obtained patches were tested in vivo via a one-stage grafting procedure in a full thickness skin wound rat model. Chitosan patches showed no adverse reactions throughout the experimental period (14 days). Hair follicles and sebaceous glands were observed in histological sections, indicating the regeneration of a thin epidermal layer with more skin appendages. Immunohistochemistry results demonstrated that keratin 10 was mostly expressed in basal and suprabasal layers, like normal skin, in structures with random porosity and with smaller lattice structures. The obtained results show the potential of EPrD to innovate the design of artificial substrates in skin healing therapies
Nanoparticles with a Bicontinuous Cubic Internal Structure Formed by Cationic and Non-ionic Surfactants and an Anionic Polyelectrolyte
No full textNanoparticles with an internal structure have been prepared by dispersing under dilute conditions poly(acrylic acid) with a polymerization degree n = 6000 (PAA(6000)) together with a cationic surfactant hexadecyltrimethylammonium hydroxide (C(16)TAOH) and the non-ionic surfactant penta(ethylene glycol) monododecyl ether (C12E5) in water. The nanoparticles are formed at different mixing ratios in the corresponding two-phase regions (liquid crystalline phase/dilute isotropic phase) of the C(16)TAPA(6000) complex salt/C12E5/water ternary phase diagram. The particles consist of polyacrylate PA(6000)(-) polyions, C(16)TA(+) surfactant ions, and C12E5. Their internal ordering was identified by small-angle Xray scattering (SAXS) to be either bicontinuous cubic with the Ia3d crystallographic space group or normal hexagonal depending upon the amount of C12E5. The bicontinuous cubic phase, to our knowledge never observed before in polyelectrolyte surfactant particle systems, was inferred by SAXS experiments. The data also showed that this structure is thermoresponsive in a reversible manner. The bicontinuous cubic space group transforms from Ia3d to Im3m as the temperature decreases from 25 to 15 degrees C. According to dynamic light scattering and electrophoretic mobility measurements, the particles have a well-defined size (apparent hydrodynamic radii RH in the range of 88-140 nm) and carry a positive net charge. The size of the nanoparticles is stable up to 1 month. The faceted nanoparticles are visualized by cryogenic transmission electron microscopy that also reveals their coexistence with thread-like C12E5 micelles
Minimal completion of doubly substochastic matrices
No full textsummary:For a given doubly substochastic matrix , by adding a (cardinal) number of columns or rows, we want to obtain a doubly stochastic matrix that contains as a sub-matrix. Then it is shown that there are minimal (cardinal) numbers of such cardinal numbers, which we call row sub-defect and column sub-defect of . We also try to obtain these two values in some cases
Gold nanoparticles and electroporation impose both separate and synergistic radiosensitizing effects in HT-29 tumor cells: an in vitro study
No full textZohre Rezaee,1,2 Ali Yadollahpour,1,2 Vahid Bayati,1 Fereshteh Negad Dehbashi1 1Cellular and Molecular Research Center, Ahvaz Jundishapur University of Medical Sciences, Avhaz, Iran; 2Department of Medical Physics, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Background and objective: Radiation therapy (RT) is the gold standard treatment for more than half of known tumors. Despite recent improvements in RT efficiency, the side effects of ionizing radiation (IR) in normal tissues are a dose-limiting factor that restricts higher doses in tumor treatment. One approach to enhance the efficiency of RT is the application of radiosensitizers to selectively increase the dose at the tumor site. Gold nanoparticles (GNPs) and electroporation (EP) have shown good potential as radiosensitizers for RT. This study aims to investigate the sensitizing effects of EP, GNPs, and combined GNPs-EP on the dose enhancement factor (DEF) for 6 MV photon energy. Methods: Radiosensitizing effects of EP, GNPs, and combinations of GNPs-EP were comparatively investigated in vitro for intestinal colon cancer (HT-29) and Chinese hamster ovary (CHO) cell lines by MTT assay and colony formation assay at 6 MV photon energy in six groups: IR (control group), GNPs+IR, GNPs (24 h)+IR, EP+IR, GNPs+EP+IR, and GNPs (24 h)+EP+IR. Results: Treatment of both cell lines with EP, GNPs, and combined GNPs-EP significantly enhanced the response of cells to irradiation. However, the HT-29 showed higher DEF values for all groups. In addition, the DEF value for HT-29 cells for GNPs+IR, GNPs (24 h)+IR, EP+IR, GNPs+EP+IR, and GNPs (24 h)+EP+IR was, respectively, 1.17, 1.47, 1.36, 2.61, and 2.89, indicating synergistic radiosensitizing effect for the GNPs (24 h)+EP+IR group. Furthermore, the synergistic effect was observed just for HT-29 tumor cell lines. Conclusion: Combined GNPs-EP protocols induced synergistic radiosensitizing effect in HT-29 cells, and the effect is also tumor specific. This combined therapy can be beneficially used for the treatment of intrinsically less radiosensitive tumors. Keywords: gold nanoparticles, radiosensitizer, electroporation, dose enhancement factor, synergistic effec
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