Search results for "Microscopic level"
showing 6 items of 6 documents
A topological look at human trabecular bone tissue
2017
Bone quality is affected by trabecular architecture at microscopic level. Various abnormalities of bone tissue lead to altered strength and to an increased susceptibility to fracture, such as Osteoporosis and Osteoarthritis, two major health burdens of our society. These are two complex musculoskeletal diseases that mainly concern bone tissue. In the last twenty years, there has been a growing interest in finding an appropriate topological model for the micro-architecture of trabecular bone tissue. In particular, we prove that these models involve general topological spaces. The appropriate notion to deal with is that of CW-complex.
Quantifiable analysis of the failure of advanced carbon fibre composite structures leading to improved safety factors
2022
Abstract The increasing use of advanced composite materials means that they must now be considered as major materials for a wide variety of structures some of which will be in service for decades. There is therefore an important need to be able to quantify damage accumulation leading to failure in these materials particularly as they are often used in extreme situations for which failure must be avoided. This review shows how damage accumulation in many major composite structures is dominated by fibre failure but that the viscoelastic nature of the matrix induces time effects including delayed failure. It is shown that damage accumulation can be quantitatively modelled using a multi-scale a…
Surface topography of membrane domains
2010
金沢大学理工研究域数物科学系
Modelling of interference fits with taking into account surfaces roughness with homogenization technique
2013
International audience; The assembly technique by shrink fit is increasingly used today because it allows for the assembly of two pieces without any intermediary part simply by the tightening effect given by the difference in diameters of the two parts assembled. The definition of assemblies depends on calculation models available in the standard. They make very restrictive assumptions that limit the geometrical defects and the surface finish. It is increasingly common to use a finite element method to better adapt the model to the complex forms of industrial parts. However, the standard is limited with regard to the consideration of roughness which results in a loss of tightening. An easy …
Quantitative bioluminescence imaging--a method for the detection of metabolite distributions in frozen tissues
1994
A novel technique allows for measurement of metabolite distributions in tissue cryosections at a microscopic level using bioluminescence, single photon imaging, and computerized image analysis. Metabolites, such as ATP, glucose and lactate are registered in absolute concentration units, and the respective images can be correlated with each other and with histological structures by specific algorithms. One striking difference between malignant tumors and normal tissue is the pronounced heterogeneity of metabolite distributions in malignancies contrasted by rather homogeneous patterns obtained in many normal organs. The heterogeneous distribution of metabolites in solid tumors reflects the ch…
Conceptual and epistemological difficulties of future teachers of physics and chemistry in the energetic explanations of physical and chemical phenom…
2016
En este trabajo analizamos las dificultades conceptuales y epistemológicas que tienen sobre termoquímica estudiantes universitarios de los últimos cursos de Física, Química e Ingeniería Química. Para ello se han aplicado a una muestra de 35 de estos futuros profesores dos cuestionarios sobre efectos térmicos en fenómenos físicos y químicos que han de explicar y se han categorizado sus respuestas según los razonamientos usados. Se ha constatado que la mayoría de los estudiantes no saben delimitar en el nivel macroscópico los sistemas que interaccionan, no utilizan el concepto de energía interna ni la primera ley de la termodinámica en los procesos físicos y químicos. Muy pocos de estos profe…