A recently developed formalism which gives a unified picture of the linear transport of moving frames is extended to include a particular type of transport under the 10-parameter Poincaré group. The frame coordinates are expressed in a 5 × 5 matrix representation which includes the position four-vector plus orthonormal tetrads for the internal coordinates. This provides a general description of the kinematics of physical systems which can be represented by moving frames. Several examples are given, including systems moving with spin (...) and Zitterbewegung along both timelike and null paths. The concept of boost or Poincaré momentum is related to system kinematics. Lagrangians of these systems are also discussed. (shrink)

A theory of the extended classical charged particle is presented. The theory assumes extension along the forward light cone of the particle instead of the usual now-plane. Solutions are given for many of the traditional problems including 4/3, instability, infinite self-energy, and runaway velocity. The Lorentz and Lorentz-Dirac equations are derived from a more general equation of motion.

Finsler geometry on the tangent bundle appears to be applicable to relativistic field theory, particularly, unified field theories. The physical motivation for Finsler structure is conveniently developed by the use of “gauge” transformations on the tangent space. In this context a remarkable correspondence of metrics, connections, and curvatures to, respectively, gauge potentials, fields, and energy-momentum emerges. Specific relativistic electromagnetic metrics such as Randers, Beil, and Weyl can be compared.

An outline is given as to how gauge transformations in a frame fiber can be interpreted as defining various types of transport of a moving frame along a path. The cases of general linear, parallel, Lorentz, and other transport groups are examined in Minkowski space-time. A specific set of frame coordinates is introduced. A number of results are obtained including a generalization of Frenet-Serret transport, an extension of Fermi-Walker transport, a relation between frame spaces and certain types of Finsler space, (...) and a derivation of a Kaluza-Klein type metric. Frame transport in general Riemannian space-time is also discussed. (shrink)

A model of the extended classical charged particle is developed further to prove that the electron potential can be expressed as a superposition of null waves. The null waves are solutions of the homogeneous wave equation and are related to some recently discovered types of solutions which are localized and propagate without dispersion. Connections with quantum electrodynamics and the fine structure constant are indicated.

The American Journal of Bioethics, Volume 11, Issue 12, Page 44-46, December 2011.

In this analysis we discuss the change in criteria for triage of patients during three different phases of a pandemic like COVID-19, seen from the critical care point of view. Availability of critical care beds has become a hot topic, and in many countries, we have seen a huge increase in the provision of temporary intensive care bed capacity. However, there is a limit where the hospitals may run out of resources to provide critical care, which is heavily dependent on (...) trained staff, just-in-time supply chains for clinical consumables and drugs and advanced equipment. In the first phase, we can still do clinical prioritisation and decision-making as usual, based on the need for intensive care and prognostication: what are the odds for a good result with regard to survival and quality of life. In the next, the resources are mostly available, but the system is stressed by many patients arriving over a short time period and auxiliary beds in different places in the hospital being used. We may have to abandon admittance of patients with doubtful prognosis. In the last phase, usual medical triage and priority setting may not be sufficient to decrease inflow and there may not be enough intensive care unit beds available. In this phase different criteria must be applied using a utilitarian approach for triage. We argue that this is an important transition where society, and not physicians, must provide guidance to support triage that is no longer based on medical priorities alone. (shrink)

Background Ethical decision-making confidence develops from clinical expertise and is a core competency for nurse leaders. No tool exists to measure confidence levels in nurse leaders based upon an ethical decision-making framework. Aims The objective of this research was to compare ethical decision-making among nurse leaders in the U.S. and three German-speaking countries in Europe by developing and testing a newly constructed Ethical Decision-Making Confidence (EDMC) scale. Methods The cross-sectional survey included 18 theory-derived questions on ethical decision-making confidence which were (...) used to develop the scale. Participants A convenience sample of nurse leaders from the U.S. and three German-speaking countries in Europe who self-identified as holding a leadership position. Ethical Considerations Ethical approval was given by the IRB Board of a U.S. university. Participation in the survey implied voluntary consent. Results The scale’s item structure dimensionality and subscale’s reliability were analyzed and compared between nurse leaders from all four countries. A principal component analysis (PCA) produced a 15-item bi-dimensional EDMC scale yielding a skill-related (9-item) and a behavior-related (6-item) confidence dimension. EDMC subscales showed good-to-excellent internal consistency. In both subscales, U.S. nurse leaders rated their mean EDMC score higher than their German-speaking counterparts in Europe. Discussion This exploratory study is the first of its kind to focus on nurse leaders’ confidence regarding ethical decision-making in an international context. An overarching factor structure was identified, which is shared by the two samples of nurse leaders and to examine (sub)scales’ psychometric properties. Conclusion This newly developed scale is an effective tool for measuring ethical decision-making confidence in nurse leaders. The promising results of this study should be replicated to ensure validity and reliability of the EDMC scale measuring skill-related and behavior-related concepts and include nurse leaders from various cultural, social, and demographic groups. (shrink)

Multimedia learning theories suggest presenting associated pieces of information in spatial and temporal contiguity. New technologies like Augmented Reality allow for realizing these principles in science laboratory courses by presenting virtual real-time information during hands-on experimentation. Spatial integration can be achieved by pinning virtual representations of measurement data to corresponding real components. In the present study, an Augmented Reality-based presentation format was realized via a head-mounted display and contrasted to a separate display, which provided a well-arranged data matrix in spatial (...) distance to the real components and was therefore expected to result in a spatial split-attention effect. Two groups of engineering students performed six experiments exploring fundamental laws of electric circuits. Cognitive load and conceptual knowledge acquisition were assessed as main outcome variables. In contrast to our hypotheses and previous findings, the Augmented Reality group did not report lower extraneous load and the separate display group showed higher learning gains. The pre- and posttest assessing conceptual knowledge were monitored by eye tracking. Results indicate that the condition affected the visual relevancy of circuit diagrams to final problem completion. The unexpected reverse effects could be traced back to emphasizing coherence formation processes regarding multiple measurements. (shrink)

Bourdieu’s thought is disturbing. Provocative. Scandalous even, at least for those who do not easily tolerate the unmitigated truth about the social. Nonetheless his ideas, among the most important and innovative of our time, are here to stay. This thought has taken form in the course of a career and through works on diverse subjects that have constructed a far-reaching analytical model of social life, which the author calls more readily an anthropology rather than a sociology. In their totality, they (...) constitute today an original and powerful proposal to explain human practices. In the face of criticisms commonly leveled at Bourdieu’s thought (notably the charge that it reduces everything to a single schematic model), it is important to identify the spirit of his enterprise. Early on, it is true, his thought drew on a few fundamental concepts—the trilogy habitus, field (champ), practice (pratique)—to which it constantly returned, and followed a clearly defined trajectory. At the same time, however, he continually reformulated, adapted, and refined his analytical model, depending on the operations to which he subjected new objects of inquiry. The regenerative and transformative force of his thought was supported by two convictions. First, that there being nothing more vain than theory for theory’s sake, it is preferable that theoretical production originate in the study of concrete and occasionally very specific cases. Second, that in order to escape stereotypical classifications, boundaries separating disciplines are best transgressed, thereby favoring new constructions of the object of inquiry. (shrink)

The "Notes of Dr. Smith's Rhetorick Lectures," discovered in 1958 by a University of Aberdeen professor, consists of lecture notes taken by two of Smith's students at the University of Glasgow in 1762-1763. There are thirty lectures in the collection, all on rhetoric and the different kinds or characteristics of style. The book is divided into "an examination of the several ways of communicating our thoughts by speech" and "an attention to the principles of those literary compositions which contribute to (...) persuasion or entertainment." The species of communication discussed include descriptive and narrative (or historical) composition, poetry, demonstrative oratory, panegyric, didactic or scientific language, deliberative oratory, and judicial or forensic oratory. The subjects addressed in his teachings include the style and genius of some of the best of the ancient writers and poets, especially the historians and the English classics. (shrink)

Marie Curie, double Prix Nobel de physique et de chimie, est sans aucun doute la femme scientifique la plus connue au monde. Sa fille aînée, Irène Joliot-Curie a suivi brillamment sa trace, obtenant elle aussi un Prix Nobel de chimie. Elle a par ailleurs donné son nom à un prix qui récompense aujourd’hui le parcours remarquable de femmes scientifiques. Mais derrière la carrière exceptionnelle de ces deux femmes, derrière les découvertes scientifiques d’intérêt mondial, il y a une mère et une...

Contrairement à ce que pourraient laisser croire certains usages du stoïcisme à des fins exclusivement thérapeutiques ou encore l’abondance des travaux récents sur l’éthique et la politique stoïcienne, la piété (eusebeia / pietas) est aussi indéniablement un élément central de la pensée stoïcienne. Comprise comme l’adéquation de la volonté humaine avec la volonté divine, elle semble sinon en conflit du moins sans grand rapport avec la religion traditionnelle et ses rites. Une « piété de la ra...