Artículos con la etiqueta ‘sistema de medidas’

On the Observational Equivalence of Continuous-Time Deterministic and Indeterministic Descriptions

Por • 10 oct, 2013 • Category: Filosofía

This paper presents and philosophically assesses three types of results on the observational equivalence of continuous-time measure-theoretic deterministic and indeterministic descriptions. The first results establish observational equivalence to abstract mathematical descriptions. The second results are stronger because they show observational equivalence between deterministic and indeterministic descriptions found in science. Here I also discuss Kolmogorov’s contribution. For the third results I introduce two new meanings of `observational equivalence at every observation level’. Then I show the even stronger result of observational equivalence at every (and not just some) observation level between deterministic and indeterministic descriptions found in science. These results imply the following. Suppose one wants to find out whether a phenomenon is best modeled as deterministic or indeterministic. Then one cannot appeal to differences in the probability distributions of deterministic and indeterministic descriptions found in science to argue that one of the descriptions is preferable because there is no such difference. Finally, I criticise the extant claims of philosophers and mathematicians on observational equivalence.

Is there currently a scientific revolution in scientometrics?

Por • 26 jul, 2013 • Category: sociologia

The author of this letter to the editor would like to set forth the argument that scientometrics is currently in a phase in which a taxonomic change, and hence a revolution, is taking place. One of the key terms in scientometrics is scientific impact which nowadays is understood to mean not only the impact on science but the impact on every area of society

multiple of 12 for Avogadro

Por • 19 feb, 2012 • Category: Ambiente

The new International System of Units may let us select an integer value for Avogadro’s number. Some might prefer an integer that’s divisible by 12, so that an integer number of $^{12}C$ atoms may be associated (at least to first order) with a gram’s mass. For educational as well as practical reasons it may also help to choose a {\em physically-meaningful} definition, within measurement error of the current numeric value. Cubes of diamond face-centered-cubic Si and (much rarer) face-centered-cubic C have been proposed, but these structures don’t have naturally occurring facets (or numbers of atoms generally divisible by 12). We show here that graphite prisms formed by stacking $m$ hexagonal graphene sheets, with $m$ Carbon-12 atoms on each side, are a natural solution to this challenge.

On Order and Randomness: A View from the Edge of Chaos

Por • 27 abr, 2011 • Category: Leyes

The recognition of the agency of the knower has enormously enriched our understanding of knowledge production. There is a growing realization that what we know about how we know affects our interpretation of reality. This realization informs the perspective of this paper. As a case study, the paper looks at the problem of randomness vs. determinism. It argues that this problem is not intrinsic to nature but is rather a product of the epistemological approach that does not pay attention to the process of the construction of knowledge. In contrast to the current one-sided solutions of the problem that represent reality as either random or deterministic, this paper argues that reality is neither random nor deterministic. Neither randomness nor determinism exists on its own.