Search Results - (Author, Cooperation:S. Pinho)

2018-05-16

National Academy of Sciences

0027-8424

1091-6490

Biology

Medicine

Natural Sciences in General

2015-12-05

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Animals ; Antigens/analysis ; Ephrin-B2/analysis ; Female ; Hematopoietic Stem Cells/*physiology ; Liver/blood supply/*embryology ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Mutant Strains ; Nestin/analysis ; Neuropilin-1/analysis ; Placental Circulation ; Portal System/chemistry/*embryology ; Pregnancy ; Proteoglycans/analysis ; Receptor, EphB4/analysis ; Stem Cell Niche/*physiology

2013-10-11

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

Animals ; Arterioles/*cytology ; Bone Marrow/blood supply ; Cell Division ; Cell Separation ; Female ; Flow Cytometry ; Hematopoietic Stem Cells/*cytology/metabolism ; Male ; Mesenchymal Stromal Cells/cytology ; Mice ; Mice, Inbred C57BL ; Nestin/metabolism ; *Stem Cell Niche

2018-10-30

The Company of Biologists

0950-1991

1477-9129

Biology

1460-2695

Blackwell Publishing Journal Backfiles 1879-2005

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Cold-working of riveted holes reduces the stress intensity factor associated with cracks that may develop at the hole boundary, by creating a compressive residual stress field. The residual stress field is determined using the finite-element method and the reduction of the stress intensity factor for different values of the interference is evaluated with the weight function method, in the case of an infinite plate made from an elastic–perfectly plastic material, and having a hole with two symmetrical cracks. Once the weight function of the structure is known, further calculation of the stress intensity factors for different loadings such as a remote uniform stress, or a point load that simulates the action of the rivet can be performed without difficulty.

Electronic Resource

1460-2695

Blackwell Publishing Journal Backfiles 1879-2005

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Delamination is one of the predominant forms of failure in laminated composite structures, especially when there is no reinforcement in the thickness direction. To develop composite structures that are more damage tolerant, it is necessary to understand how delamination develops, and how it can affect the residual performance. A number of factors such as residual thermal stresses, matrix-curing shrinkage and manufacturing defects affect how damage will grow in a composite structure. It is important to develop computationally efficient analysis methods that can account for all such factors. The objective of the current work is to apply a newly developed decohesion element to investigate the debond strength of skin-stiffener composite specimens. The process of initiation of delaminations and the propagation of delamination fronts is investigated. The numerical predictions are compared with published experimental results.

Electronic Resource

0031-9422

Aldina heterophylla ; Andira parviflora ; Crudia amazonica ; Diplotropis purpurea ; Eperua bijuga ; Leguminosae ; flavonoids.

Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Biology

Chemistry and Pharmacology

Electronic Resource

1573-4838

Springer Online Journal Archives 1860-2000

Medicine

Technology

Abstract The aim of this study was to compare qualitative and quantitative methods for coating characterization on internal surfaces of polyvinyl chloride (PVC) tubing used in procedures of extracorporeal circulation. The methods of characterization included optical microscopy (OM) after dyeing with toluidine blue, scanning electron microscopy (SEM), atomic force microscopy (AFM) and energy dispersive spectrometry (EDS). OM after sample dyeing was excellent in allowing early detection of any absence or irregularities of coatings among the used methods. SEM was the most effective in observing the structure and thickness either in heparin coatings or in lipid coatings. AFM provided a good evaluation of the surface topography. A conjunction of all methods is recommended for complete characterization. The quantification methods based on colorimetric tests were efficient in determining the concentrations of heparin and lipid on internal surface tubes, the coating stability and the reproducibility of the results. © 1998 Kluwer Academic Publishers

Electronic Resource

1434-6036

Springer Online Journal Archives 1860-2000

Physics

Abstract. We analyze the ferromagnetic Ising model on non-Euclidean scale invariant lattices with aperiodic interactions (J A ,J B ,J C ,J D ) defined by Rudin-Shapiro substitution rules with Migdal-Kadanoff renormalization (MKR) and transfer matrix (TM) techniques. The analysis of the invariant sets of the zero-field MKR transformation indicates that the critical behavior, completely distinct from the one of the uniform model, is described by a new off-diagonal fixed point. This contrasts with other aperiodic models where the new critical behavior is described by a period-two cycle. With the new fixed point, values for the thermal critical exponents, $\alpha $ and $\nu$ , as well as the period of log-periodic oscillations, are obtained. Exact recursive maps for all thermodynamical functions are derived within the TM approach. The explicit dependence of the thermodynamical functions with respect to temperature is evaluated by the numerical iteration of the set of maps until a previously chosen convergence is achieved. They also indicate that, depending on the actual choice for the aperiodic coupling constants, the magnetic exponents ( $\beta $ and $\gamma$ ) assume different values. However the Rushbrook relation is always satisfied.

Electronic Resource