8,929 research outputs found
A new deep-sea pennatulacean (Anthozoa: Octocorallia: Chunellidae) from the Porcupine Abyssal Plain (NE Atlantic)
During the BENGAL cruises, an important
collection of deep-sea benthic organisms was sampled.
Among the pennatulacean colonies, a previously undescribed species of chunellid was collected. That material
is here described as the type species of a new genus,
Porcupinella gen. nov. The new genus and species are
described based on material collected in the Porcupine
Abyssal Plain (NE Atlantic), 4,839–4,847 m in depth. This
is the first time that a chunellid is reported from the
Atlantic Ocean. The new genus is compared with the other
genera in the family, and some phylogenetic remarks about
the families Chunellidae and Umbellulidae are also
provided
Biomechanical analysis of a cranial Patient Specific Implant on the interface with the bone using the Finite Element Method
- New advance technologies based on reverse engineering , design and additive
manufacturing, have expanded design capabilities for biomedical applications to
include Patient Specific Implants (PSI). This change in design paradigms needs
advanced tools to assess the mechanical performance of the product, and
simulate the impact on the patient. In this work, we perform a structural
analysis on the interface of a cranial PSI under static loading conditions.
Based on those simulations, we have identified the regions with high stress and
strain and checked the failure criteria both in the implant and the skull. We
evaluate the quality of the design of the implant and determine their response
given different materials, in order to ensure optimality of the final product
to be manufactured
¿Se pueden conseguir plásticos barrera a medida?
La Industria del Envase y Embalaje forma parte de uno de los sectores principales de aplicación de los materiales polímeros. De todos es conocido que el vidrio, papel y metales que durante muchos años se utilizaron en el embalaje y empaquetamiento de alimentos, bebidas y otros productos han sido parcialmente reemplazados en la actualidad, por sustancias de naturaleza polimérica que permiten la regularización del transporte de gases y vapores a su través.
Se puede decir que uno de los principales problemas con los que se encuentran los profesionales del Sector es encontrar la mejor protección de los productos desde su empaquetamiento hasta su utilización final por el consumidor. La preservación de la calidad de los productos envasados involucra no solo la protección del sabor sino también la necesidad de evitar malos olores en el alimento envasado. De ahí la importancia que el análisis de las propiedades de transporte de masas en los filmes tiene en la industria del envasado.
Sin embargo los estudios del transporte de gases y/o vapores son complejos ya que la permeabilidad del material es el resultado de diferentes etapas, por un lado la solubilidad del gas en una cara de la membrana y por otro su difusión en el interior del film hacia la otra cara y su desorción de la misma. Todas estas etapas están fuertemente influenciadas por una serie de factores, como la naturaleza del film polimérico, la temperatura de uso, los aditivos (cargas o plastificantes), etc…, que hay que tener en cuenta a la hora de diseñar un material apto para envasado.
Por tanto, el objetivo de esta conferencia es revisar los factores que hay que considerar en el transporte de gases a través de membranas poliméricas densas, desde un punto de vista químico-físico, mostrando diversos ejemplos de cómo se pueden modificar estas propiedades barrera para adecuarlas a las necesidades del producto a envasar.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec
Genetic study in patients operated dentally and anesthetized with articaine-epinephrine
Aims: In this study we wanted to figure out if there was a correlation between OPRM1 N40D, TRPV1 I316M, TRPV1 I585V, NOS3 −786T>C and IL6 −174C>G polymorphisms and the response to locally applied articaine-epinephrine anesthetic.
Methods: In this observational study, 114 oral cell samples of patients anesthetized with articaine-epinephrine (54 from men 60 from women), were collected from dental centers in Madrid (Spain). High molecular weight DNA was obtained from oral mucosa cells. The analysis of OPRM1 N40D (rs1799971), TRPV1 I316M (rs222747), TRPV1 I585V (rs8065080) and IL6 −174C>G polymorphism was performed through real-time PCR allelic discrimination using TaqMan probes. Polymorphism NOS3 −786T> C (rs2070744) was analyzed using RFLP-PCR.
Results: The studied polymorphisms are involved neither in the response to the anesthetic, nor in the intensity of perceived dental pain. However, in a subset of female patients we found that TRPV1 I316M was associated with a delayed onset of anesthesia.
Conclusions: There is no association among these polymorphisms and the time elapsed between the application of the anesthetic and the onset of its effect
Quasi-exactly Solvable Lie Superalgebras of Differential Operators
In this paper, we study Lie superalgebras of matrix-valued
first-order differential operators on the complex line. We first completely
classify all such superalgebras of finite dimension. Among the
finite-dimensional superalgebras whose odd subspace is nontrivial, we find
those admitting a finite-dimensional invariant module of smooth vector-valued
functions, and classify all the resulting finite-dimensional modules. The
latter Lie superalgebras and their modules are the building blocks in the
construction of QES quantum mechanical models for spin 1/2 particles in one
dimension.Comment: LaTeX2e using the amstex and amssymb packages, 24 page
Nonlinear Pseudo-Supersymmetry in the Framework of N-fold Supersymmetry
We recall the importance of recognizing the different mathematical nature of
various concepts relating to PT-symmetric quantum theories. After clarifying
the relation between supersymmetry and pseudo-supersymmetry, we prove
generically that nonlinear pseudo-supersymmetry, recently proposed by Sinha and
Roy, is just a special case of N-fold supersymmetry. In particular, we show
that all the models constructed by these authors have type A 2-fold
supersymmetry. Furthermore, we prove that an arbitrary one-body quantum
Hamiltonian which admits two (local) solutions in closed form belongs to type A
2-fold supersymmetry, irrespective of whether or not it is Hermitian,
PT-symmetric, pseudo-Hermitian, and so on.Comment: 10 pages, no figures; typos correcte
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