Search results for "edge"
showing 10 items of 3866 documents
When are thin films of metals metallic? Part III
1996
Abstract A large amount of experimental information has indicated that very thin films of metallic elements can exhibit nonmetallic behavior, even on metal substrates. These films undergo a gradual nonmetal to metal transition with increasing film density or thickness. The nonmetallic behavior can be related to electron localization due to strong electron-electron correlation in low dimensional systems, as indicated by the strong enhancement of electron effective mass. The evolution in the electronic structure associated with the nonmetal to metal transition bears a striking resemblance to the behavior observed for free metal clusters. Part I [1], outlined the general concepts of a nonmetal…
Probing the Thermochromic Phase Transition in CuMoO 4 by EXAFS Spectroscopy
2018
The work was supported by philanthropist MikroTik and administrated by the University of Latvia Foundation. The experiment at HASYLAB/DESY was performed within the project I-20160149 EC.
Why Is Mind-Wandering Interesting for Philosophers?
2018
This chapter explores points of contact between philosophy of mind and scientific approaches to spontaneous thought. While offering a series of conceptual instruments that might prove helpful for researchers on the empirical research frontier, it begins by asking what the explanandum for theories of mind-wandering is, how one can conceptually individuate single occurrences of this specific target phenomenon, and how one might arrive at a more fine-grained taxonomy. The second half of this contribution sketches some positive proposals as to how one might understand mind-wandering on a conceptual level, namely, as a loss of mental autonomy resulting in involuntary mental behavior, as a highly…
Meeting the Discipline-Culture Framework of Physics Knowledge: A Teaching Experience in Italian Secondary School
2014
The paper deals with physics teaching/learning in high school. An investigation in three upper secondary school classes in Italy explored the reactions of students to a structuring lecture on optics within the discipline-culture (DC) framework that organises physics knowledge around four interrelated fundamental theories of light. The lecture presented optics as an unfolding conceptual discourse of physicists regarding the nature of light. Along with the knowledge constructed in a school course of a scientific lyceum, the students provided epistemological comments, displaying their perception of physics knowledge presented in the classroom. Students’ views and knowledge were investigated by…
Experiences in Sense Making: Health Science Students’I-Positioning in an Online Philosophy of Science Course
2014
This article reports on a qualitative study on the dialogical approach to learning in the context of higher education. The aim was to shed light on the I-Position and multivoicedness in students’ identity building and to provide empirical substantiation for these theoretical constructs, focusing especially on the connection between personal knowledge and theoretical knowledge. The study explored how health science students’ reflections on their work and discipline-related experiences provided resources for making personal sense of and understanding the subject studied. The students took an online course on the philosophy of science. To study students’ internal and external dialogue in terms…
Interpersonal Recognition and Responsiveness to Relevant Differences
2006
Abstract This essay defends a three‐dimensional response‐model theory of recognition of persons, and discusses the related phenomenon of recognition of reasons, values and principles. The theory is three‐dimensional in endorsing recognition of the equality of persons and two kinds of relevant differences: merits and special relationships. It defends a ‘response‐model’ which holds that adequacy of recognition of persons is a matter of adequate responsiveness to situation‐specific reasons and requirements. This three‐dimensional response‐model is compared to Peter Jones’s view, which draws the distinction between status and merit recognition, and mediated and unmediated recognition. The essay…
Adán y Eva. Una antropología darwinista
2020
El artículo sugiere algunas observaciones sobre una antropología darwinista planteada a partir del conocimiento científico disponible. Al efecto, señala la importancia del estudio del genoma humano como fundamento de una reflexión filosófica de segundo grado sobre la naturaleza del ser humano, subrayando las grandes similitudes entre el Homo sapiens y las especies evolutivamente más próximas. Además, a partir del estudio del ADN mitocondrial y del cromosoma Y, centra la atención en el principio de coalescencia evolutiva entre seres humanos, gracias al cual es posible afirmar que todos ellos son miembros consanguíneos de un mismo linaje. Concluye proponiendo algunas inferencias que muestran …
Zināšanas izpratne Hēgeļa gara fenomenoloģijā. Hermeneitiskā dialektika
2013
Elektroniskā versija nesatur pielikumus
Preparation of N-doped TiO2: characterization and photocatalytic performance under UV and visibile light
2009
Nanocrystalline N-doped TiO(2) samples were prepared by using TiCl(4) or TiOSO(4) as precursors. The powders were characterized by X-ray diffraction, BET specific surface area measurements, scanning electron microscopy, diffuse reflectance spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The photocatalytic activity was tested using the photodegradation of 4-nitrophenol under UV and visible light.Some samples were more active than commercial Degussa P25. A shift of the absorption edge to a lower energy and a stronger absorption in the visible light region were observed in the samples obtained from TiCl(4). Two absorption edges were observed in the samples derived from T…
Observing heme doming in myoglobin with femtosecond X-ray absorption spectroscopy.
2015
International audience; We report time-resolved X-ray absorption measurements after photolysis of carbonmonoxy myoglobin performed at the LCLS X-ray free electron laser with nearly 100 fs (FWHM) time resolution. Data at the Fe K-edge reveal that the photoinduced structural changes at the heme occur in two steps, with a faster (∼70 fs) relaxation preceding a slower (∼400 fs) one. We tentatively attribute the first relaxation to a structural rearrangement induced by photolysis involving essentially only the heme chromophore and the second relaxation to a residual Fe motion out of the heme plane that is coupled to the displacement of myoglobin F-helix