The Role of the Duality Rotation in the Dirac Theory. Comparison between the Darwin and the Krüger Solutions for the Central Potential Problem

The Electron ◽  
1991 ◽  
pp. 83-104 ◽  
Author(s):  
Roger Boudet
2011 ◽  
Vol 16 (2) ◽  
pp. 133-142 ◽  
Author(s):  
Kate Weiner

This paper explores the notion of the late modern or reflexive subject, for whom consumption, rationality, autonomy and a reflexive attitude to risk are said to be constitutive. Drawing on an example of ‘ordinary’ health consumption ( GRONOW and WARDE, 2001 ), the paper addresses what kinds of consumer identities emerge in people's talk about buying or eating foods containing phytosterols. These are ‘functional foods’ which are marketed on the basis that they actively lower cholesterol. Based on interviews with people who say that they buy or eat these foods, the analysis focuses on participants’ reported trajectories relating to how this came about. Participants’ accounts contain a number of explicit and implicit reasons for buying or eating the foods, which I characterise as agential, contextual, or non-agential, depending on the degree to which they draw on the agency of the actual purchaser or eater. These different types of explanations can be ordered in terms of their appeals to rationality, risk consciousness and autonomy. In agential explanations, people talk, for example, of doing something good for themselves, or experimenting with the foods. These explanations explicitly position consumers as health conscious, autonomous and rational to varying degrees. Contextual explanations drew on, for example, the role of doctors or family history in alerting people to a potential problem. These suggest both a different sense of risk consciousness, which may be prompted or contextual, and a less autonomous kind of consumer who is connected to others through a set of family and other relationships. Non-agential explanations, for example, where people attributed their consumption to others or to habit, appeal neither to the rationality, the health consciousness nor the autonomy of the actual consumer. The analysis helps to reinforce the potentially contextual or fluctuating nature of risk consciousness, and the relational and non-instrumental aspects of daily practices.


1994 ◽  
Vol 09 (09) ◽  
pp. 1555-1568 ◽  
Author(s):  
DMITRIJ P. SOROKIN ◽  
DMITRIJ V. VOLKOV

Drawing an analogy with the Dirac theory of fermions interacting with electromagnetic and gravitational field we write down supersymmetric equations of motion and construct a superfield action for particles with spin [Formula: see text] and [Formula: see text] (quartions), where the role of quartion momentum in effective (2+1)-dimensional space–time is played by an Abelian gauge superfield propagating in a basic two-dimensional Grassmann-odd space with a cosmological constant showing itself as the quartion mass. So, the (0|2) (0 even and 2 odd) dimensional model of quartions interacting with the gauge and gravitational field manifests itself as an effective (2 + 1)-dimensional supersymmetric theory.


2019 ◽  
pp. 75-99
Author(s):  
Lisa M. Oakes ◽  
David H. Rakison

One potential problem with the development cascades approach is that it appears to be unconstrained. However, as discussed in this chapter, constraints in development can be broadly defined. Constraints have typically been conceived of as either innate and present at birth or acquired through experience. This chapter argues instead that developmental cascades are influenced profoundly by different kinds of constraints that do not have a single foundation. Constraints can be structural (e.g., originating from the structure of the child’s nervous system and body), a function of the physical or social environment, or the result of accumulated knowledge and experience. These constraints, it is argued, occur at multiple levels of processing and change over time, both of which contribute to developmental cascades and are the product of cascades.


1986 ◽  
Vol 75 (1) ◽  
pp. 220-223 ◽  
Author(s):  
K. Morita
Keyword(s):  

2018 ◽  
Vol 69 (10) ◽  
pp. 2863-2867
Author(s):  
Mark Edward Pogarasteanu ◽  
George Dinache ◽  
Marius Moga ◽  
Ana Maria Oproiu ◽  
Florentina Ionita Radu

A key component of a successful external myoprosthesis is not a part of the prosthesis, but an area: the interface between the prosthesis and the amputation stump. This is because in this area takes place a critical exchange of information, in the form of a myoelectrical signal being transferred from the muscles, through the fascia, fat and skin, to the surface EMG sensors, that in turn transfer this information to a part of the prosthesis that is responsible with the analysis, augmentation and use of this signal in order to control the movements of the electromechanical parts of the prosthesis. Any condition that leads to an impaired transmission of information from the skin to the EMG sensors inevitably leads to an underperformance of what may otherwise be a highly developed model of exoprosthesis, thus potentially rendering it no more useful than a basic mechanical model. We aim to review the possible difficulties that may arise in this area, and that may lead to a faulty transfer of signal, with a loss in quantity or quality. For this purpose, we will review the current literature for this subject, including reference books and articles, and complete this information with our personal experience. In doing this, we hope to provide a guide to practitioners, bioengineers and patients alike, in order to be able to anticipate and correct any potential problem as they may arise.


2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
M. Dima

A number of particle properties stem from the use ofγ0as adjunctator (Bargmann-Pauli) in the Dirac theory (spin alignment, Dirac current, etc.). The early motivations for acceptingγ0as adjunctator were representation-dependent, mildly bearing relation to the actual conditions forcingγ0as adjunctator. Representation-independent approaches to the physical predictions of the Dirac equation are somewhat new, here presented as being the reasons forγ0as adjunctator of the Dirac theory, together with the essential role of the latter in the physical aspects of the theory.


JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.


2018 ◽  
Vol 41 ◽  
Author(s):  
Kevin Arceneaux

AbstractIntuitions guide decision-making, and looking to the evolutionary history of humans illuminates why some behavioral responses are more intuitive than others. Yet a place remains for cognitive processes to second-guess intuitive responses – that is, to be reflective – and individual differences abound in automatic, intuitive processing as well.


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