Physical apparatus for educational purposes

1925 ◽  
Vol 2 (10) ◽  
pp. 335-335
Author(s):  
Robt W Paul
Keyword(s):  
Physical Apparatus

Introduction

1958 ◽  
Vol 246 (1247) ◽  
pp. 441-443 ◽  
Keyword(s):  
Atomic Physics ◽  
Nuclear Physics ◽  
Classical Physics ◽  
Left Handed ◽  
Physical Apparatus ◽  
High Degree ◽  
Very High

Although the discussion today is intended to be technical, it may be useful to start with a few words about the nature of the problem. What is parity and what is its violation ? Basically, this means going back to the principle that the laws of physics are indistinguishable if one changes from a right-handed to a left-handed co-ordinate system, or in other words, that any physical apparatus observed in a mirror will appear to obey the same laws of physics as the original. We are well aware of the fact that this symmetry holds wherever we have checked it throughout classical physics; it holds throughout atomic physics, and it seems to hold to a very good degree of accuracy in nuclear physics as well. In physics we always proceed by attempting generalizations, being prepared to give these up when evidence is in contradiction with them; and therefore in general when we see a symmetry hold good to a very high degree of accuracy, we are inclined to assume that it will hold absolutely.

scholarly journals Membrane analogy for multi-material bars under torsion

2019 ◽  
Vol 475 (2225) ◽  
pp. 20190124 ◽  
Author(s):  
Laura Galuppi ◽  
Gianni Royer-Carfagni
Keyword(s):  
Finite Element ◽  
Cross Section ◽  
Cross Sections ◽  
Three Dimensional ◽  
Element Model ◽  
Elastic Problem ◽  
Two Dimensional ◽  
Torsion Problem ◽  
Linear Elastic ◽  
Physical Apparatus

Prandtl's membrane analogy for the torsion problem of prismatic homogeneous bars is extended to multi-material cross sections. The linear elastic problem is governed by the same equations describing the deformation of an inflated membrane, differently tensioned in regions that correspond to the domains hosting different materials in the bar cross section, in a way proportional to the inverse of the material shear modulus. Multi-connected cross sections correspond to materials with vanishing stiffness inside the holes, implying infinite tension in the corresponding portions of the membrane. To define the interface constrains that allow to apply such a state of prestress to the membrane, a physical apparatus is proposed, which can be numerically modelled with a two-dimensional mesh implementable in commercial finite-element model codes. This approach presents noteworthy advantages with respect to the three-dimensional modelling of the twisted bar.

Physical apparatus for educational purposes

1925 ◽  
Vol 2 (5) ◽  
pp. 168-169
Author(s):  
Chas R Darling
Keyword(s):  
Physical Apparatus

scholarly journals Exhibitions of Physical Apparatus

Nature ◽  
1894 ◽  
Vol 50 (1285) ◽  
pp. 151-152
Author(s):  
R. A. G.
Keyword(s):  
Physical Apparatus

Ex-Centric Hermeneutics in Stephanus Muller's Nagmusiek

2018 ◽  
Vol 49 ◽  
pp. 179-194
Author(s):  
Willemien Froneman
Keyword(s):  
South African ◽  
Academic Writing ◽  
Review Article ◽  
Physical Apparatus

In this review article the author reads Nagmusiek – Stephanus Muller's monumental metafictional biography of South African composer Arnold van Wyk – as an extended allegory on the geopolitics of academic writing. She argues that the book articulates, through its unusual physical apparatus, narratological techniques and metafictional hermeneutic deconcealment, a valuable theory-in-praxis of the aporetics of peripheral writing. In so doing, Muller materializes Walter Mignolo's notion of ‘epistemic delinking’ in radically original and risky ways.

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