نتایج جستجو برای: changing materials
تعداد نتایج: 577429 فیلتر نتایج به سال:
Composite dental restorations represent a unique class of biomaterials with severe restrictions on biocompatibility, curing behavior, esthetics, and ultimate material properties. These materials are presently limited by shrinkage and polymerization induced shrinkage stress, limited toughness, the presence of unreacted monomer that remains following the polymerization, and several other factors....
Organic-inorganic hybrid perovskites, which have proved to be promising semiconductor materials for photovoltaic applications, have been made into atomically thin two-dimensional (2D) sheets. We report the solution-phase growth of single- and few-unit-cell-thick single-crystalline 2D hybrid perovskites of (C4H9NH3)2PbBr4 with well-defined square shape and large size. In contrast to other 2D mat...
American families and workplaces have both changed dramatically over the past half-century. Paid work by women has increased sharply, as has family instability. Education-related inequality in work hours and income has grown. These changes, says Suzanne Bianchi, pose differing work-life issues for parents at different points along the income distribution. Between 1975 and 2009, the labor force ...
Iron chalcogenide superconductors FeSe1-xTex are important materials for investigating the relation be-tween the superconductivity and the orbital and/or electronic nematic order, because the end member material FeSe exhibits a structural transition without a magnetic phase transition. However, the phase separation occurs in the region of 0.1 ≤ x ≤ 0.4 for bulk samples, and it prevents the comp...
There are many benefits in using the Internet for teaching and learning. For these benefits to be fully realised, teachers and learners must be prepared to take on new roles. This paper examines what these new roles are, and suggests possible steps that could be taken to address these changing roles.
Martin W. Scheeler, ∗ Dustin Kleckner∗,1, † Davide Proment, Gordon L. Kindlmann, and William T.M. Irvine ‡ James Franck Institute, Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA. School of Mathematics, The University of East Anglia, NR4 7TJ Norwich, Norfolk, UK. Computation Institute, Department of Computer Science, The University of Chicago, Chicago, Illinois 60...
Surgical reconstruction of large facial defects is not possible at times due to extensive loss of tissues that cannot be corrected by surgery alone. In these cases, prosthetic restoration of lost facial tissues can be done using maxillofacial prostheses. Introduction of new material which gives life-like appearance to such prosthetic restorations e.g. silicone and poly ether rubbers and use of ...
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