**http://www.ivorcatt.co.uk/x5cz2.htm**

**http://www.ivorcatt.co.uk/x6aa.pdf**

**This is http://www.ivorcatt.co.uk/x8b8yak4.htm**

**http://www.ivorcatt.co.uk/x854spargo.htm**

Christopher Donaghy-Spargo -- http://rsta.royalsocietypublishing.org/content/376/2134/20170457

Alex Yakovlev -- **https://royalsocietypublishing.org/doi/10.1098/rsta.2017.0449**

**http://www.ivorcatt.co.uk/x89uned.htm**

**http://www.ivorcatt.co.uk/x5a6.htm**

**http://www.ivorcatt.co.uk/x8b8yak3.html**

**http://rsta.royalsocietypublishing.org/content/376/2134/20170449**

**PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A**

**MATHEMATICAL, PHYSICAL AND ENGINEERING SCIENCES**

Alex Yakovlev

Published 29 October 2018.DOI: 10.1098/rsta.2017.0449

**Abstract**

In his seminal *Electrical
papers*, Oliver Heaviside stated ‘We reverse this …'
http://www.ivorcatt.co.uk/x3117.htm
referring to the relationship between energy current and state changes in electrical
networks. We explore implications of Heaviside's view upon the state changes in
electronic circuits, effectively constituting computational processes. Our
vision about energy-modulated computing that can be applicable for electronic
systems with energy harvesting is introduced. Examples of analysis of
computational circuits as loads on power sources are presented. We also draw inspiration
from Heaviside's way of using and advancing mathematical methods from the needs
of natural physical phenomena. A vivid example of Heavisidian
approach to the use of mathematics is in employing series where they emerge out
of the spatio-temporal view upon energy flows. Using *series
*expressions, and types of natural discretization in space and time, we
explain the processes of discharging a capacitive transmission line, first,
through a constant resistor and, second, through a voltage controlled digital
circuit. We show that event-based models, such as Petri nets with an explicit
notion of causality inherent in them, can be instrumental in creating bridges
between electromagnetics and computing.

This article is part of the theme issue
‘Celebrating 125 years of Oliver Heaviside's ‘Electromagnetic Theory’’.

**1. Preface**

This year

…. ….

Yet, in the year 2013, I
came across Oliver Heaviside's work in full. ….

Next, in the same 2013, by sheer coincidence I
exchanged emails with Mr Ivor Catt about the late Professor David Kinniment, my colleague and mentor of many years, who studied
an interesting and challenging phenomenon called metastability
(connected to the philosophical problem of choice and the story of Buridan's ass) [**4**,**5**] in digital circuits during his 45-year
academic career. From David Kinniment http://www.ivorcatt.co.uk/x8bkinn.pdf
I had known that **Ivor Catt was one of the early discoverers of this phenomenon, which he called
The Glitch** [**6**]. **http://www.ivorcatt.co.uk/x84gglitch.pdf ; http://www.ivorcatt.co.uk/x1bn.pdf
. **To my amazement, in my conversation with Ivor Catt,
he told me about his other passion. That other work, which had absorbed him for
nearly 40 years, was on developing and promoting his own version of
electromagnetic theory (called Catt-theory or **Theory C**) [**7**]. Ivor Catt sent me his book and several
articles in IEEE journals and in the *Wireless World* magazine. **They showed how this
theory advanced Heaviside's theory** (Theory H) of transverse electromagnetic
(TEM) waves and the concept of **energy current**. I managed to organize a seminar on
Electromagnetism at Newcastle on 9 October 2013 to which I invited Mr Ivor Catt
and Dr David Walton, who worked with Ivor Catt on various parts of his theory,
particularly on demonstrating that **a capacitor is a transmission line** (TL) [**8**] http://www.ivorcatt.co.uk/x3b2.pdf
. Coincidentally, David Walton obtained both of his Physics degrees from Newcastle
University, and on the same day of 9 October 2013 there was a historical 50th
anniversary reunion of Electrical Engineering graduates of 1963, some of whom
had known David Walton (moreover some again, by coincidence had known Ivor
Catt), so **the
date was truly momentous**. Ivor Catt himself gave a 2 h lecture
[**9**] [actually 3 hour] which was followed by
an hour-long lecture by David Walton [**10**]. These lectures showed a demonstration
of the physics of some phenomena, ordinarily known to engineers, such as charging
a capacitor, in an unconventional form—namely by applying a step voltage to a
TL. The well-known exponential charging was the result of an approximated
series of discrete steps **http://www.ivorcatt.org/icrwiworld78dec1.htm**
caused by the cyclic process of the travelling TEM wave. This theory was
supported by an experiment, known as **Wakefield experiment** [**11**], **http://www.ivorcatt.co.uk/x343.pdf
**; **http://viewer.zmags.co.uk/publication/3796f068#/3796f068/74
(**p72) which led to the conclusion that **there is no such a
thing as a static electric field in a capacitor. ****[What does “a capacitor” mean? Are
some electric fields static and others dynamic? Horses for [career] courses? - IC]** In other words, a capacitor is **a ****form of [!]** TL http://www.ivorcatt.co.uk/x3b2.pdf
in which a TEM wave moves with a single
fixed velocity, which is the speed of light in the medium. **[Schools and
colleges teach the other form of capacitor, the ones that are not a TL - the
better behaved square ones entered at the middle, like the symbol, which
support all the mathematics.]**** **Below we reproduce both
the derivation of the TL-based capacitor discharge and the description of the
Wakefield experiment.

Those lectures triggered my deep interest in
studying Oliver Heaviside's work and, even more, his whole life. And this very
interest drew me to (then PhD student but now Dr) Christopher Donaghy-Spargo, with whom we founded NEMIG—northeast
Electromagnetics Interest Group, which since 2013 has enjoyed a formidable
series of seminars given by scientists, engineers, historians and
entrepreneurs, driven by the ideas and lives of Maxwell, Heaviside and
generally by the exciting field of electromagnetism.

Coming back to the main
object of this paper, which is the relationship between energy current and
computing, I must admit that I had drawn most of inspiration from my
familiarization with Heaviside's work, his legacy in the work of others, and to
a great extent by the fact that both Ivor Catt and David Walton came to
studying electromagnetic theory from the point of view of energy current
through their experiences in dealing with high-speed digital electronics. [ http://www.ivorcatt.co.uk/x66111.pdf
] This electronics does not deal with sine waves. It deals with **digital pulses, which
are physical enough to be dealt with in a ‘more physical way'** rather than **expressing them as an algebraic sum of sine wave **harmonics
stretching in the time domain from −∞ to +∞. http://www.ivorcatt.co.uk/x18j197.pdf
. Such pulses have a clear starting point in time and endpoint in time. They naturally
lend themselves to causality between actions, such as a rising edge of one
pulse causes a falling edge of another pulse, for example, as the signal passes
through a logic NOT element (inverter). As I spent
most of my own 40 working years exploring asynchronous self-timed digital circuits,
and such circuits could work directly when the power is applied to their vdd lines, I was firmly attracted by the natural beauty of
the ideas of the electromagnetic theory approach relying basically only on
energy current, Poynting vector (*S* = *E* × *H*,
vector product of the electrical field vector and magnetic field vector,
representing the directional energy flux, measured in Watt per square metre;
note that it is sometimes referred to as Umov–Poynting vector) and TEM wave—particularly by its
compactness and parsimony of Occam's Razor.

Another important aspect of my fascination of the
energy-current approach to computational electronics is associated with the
fundamental role that mathematical series play there.

Series, so much loved and revered (to the poetic
level!) by Heaviside, are at the core of the vision of all electromagnetic
phenomena because they relate all state changes in the electromagnetic field
with the geometry of the space and medium.

….

Setting the scene, I
would like to finish this preface with a quote from David Walton's lecture
abstract [**10**]:It is
normally recognised that the postulation of Displacement current by James Clerk
Maxwell was a vital step which led to the understanding that light was an
electromagnetic wave. I will examine the origins of **displacement current** by consideration of the behaviour of the dielectric
in a lumped capacitor and will show that it **has no physical reality**. [ http://www.ivorcatt.org/icrwiworld78dec1.htm
] In the absence of an ether there is no rationale for
displacement current. We are then left with a theory which works mathematically
but has no basis in physical reality. I will discuss **the remarkable property of empty space in that it
has the ability to accommodate energy.** http://www.forrestbishop.mysite.com/EMTV2/EMTvol2p236-7.jpg
. I will then show that Faraday's law and conservation of charge lead to
the existence of electromagnetic energy which travels at a **single fixed velocity** and has a determined relationship between the electric
and magnetic fields. Because this mathematics is reversible it follows that
these two physical laws can be considered to be consequences of the nature of
electromagnetic energy rather than the reverse.

[**space**** …. has the
ability to accommodate energy. **Perhaps the lack of this concept is why I cannot
understand either side in the “debate” over whether the aether exists. Prior to
Yakovlev today, where has this key idea been discussed during the “debate”? Is
it irrelevant? - IC]

@@@@@@@@@@@@@@@

Setting the scene, I would like to finish this
preface with a quote from David Walton's lecture abstract [**10**]:

It is normally recognised that the postulation of Displacement current by James Clerk Maxwell was a vital step which led to the understanding that light was an electromagnetic wave. I will examine the origins of displacement current by consideration of the behaviour of the dielectric in a lumped capacitor and will show that it has no physical reality. In the absence of an ether there is no rationale for displacement current.

We are then left with a theory which works mathematically but has no basis in physical reality.I will discuss the remarkable property of empty space in that it has the ability to accommodate energy. I will then show that Faraday's law and conservation of charge lead to the existence of electromagnetic energy which travels at a single fixed velocity and has a determined relationship between the electric and magnetic fields. Because this mathematics is reversible it follows that these two physical laws can be considered to be consequences of the nature of electromagnetic energy rather than the reverse.

2. Energy-modulated computing….

….

3. Computing by accumulating and dividing energy

(a) On the creative role ofseries

….

(b) Capacitor as transmission lineThe configuration that we want to consider here is shown in

figure 4.

Figure 4Circuit for charging and discharging a capacitor seen as a transmission line. (Online version in colour.)

Assume, first, that the capacitor was charged via resistor

Rto the voltageV(via switch S1). Then we disconnect S1 and connect S2. The capacitor is a (e.g. coaxial cable) TL with a characteristic impedanceZ0. Let us assume thatR≫Z0, and we assume thatRis constant. The reflection coefficient at the right-hand side terminals of the open-ended….

(c) The Wakefield experimentAn experimental evidence of the stepwise discharge process for a capacitor modelled by a co-axial cable has been presented by Ivor Catt in

Electronics Worldin April 2013 [11]. Here is only a brief recap of this description. The experiment bears the name of Mr Tony Wakefield of Melbourne, who actually built the configuration and performed all the measurements. Catt wrote:We now have experimental proof that the so-called steady charged capacitor is not steady at all. Half the energy in a charged capacitor is always travelling from right to left at the speed of light, and the other half from left to right [seefigure 5]. The Wakefield experiment uses a 75-ohm coax 18 meters long. The left-hand end is an open circuit. The right-hand end is connected to a small, 1 cm long, normally open reed switch. On the far side of the reed switch is a 75-ohm termination resistor simulating an infinitely long coaxial cable. A handheld magnet is used to operate the switch.The coax is charged from a 9 V battery via 2 × 1 megohm resistors, close-coupled at the switch to centre and ground. The two resistors are used to isolate the relatively long battery wires from the coax. High value resistors are used to minimize any trickle charge after the switch is closed.A 2-channel HP 54510B digital sampling scope set to 2 V div^{−1}vertical and 20 ns div^{−1}horizontal is used to capture five images.

Figure 5.Wakefield experiment set-up: coaxial cable as a cap with tapping points. (Online version in colour.)

For the reasons of copyright, I cannot copy these images from Catt's paper. But, they were taken in the following points: (A) across the terminator 75-ohm resistor, (B) 25% to the left of the reed switch (4.5 m), (C) 50% to the left of the reed switch (9 m), (D) 75% to the left of the reed switch (13.5 m), (E) at the extreme left of the open end of the cable (

figure 6).

Figure 6.Signal plots for the Wakefield experiment, in five different locations. (Online version in colour.)

….

….

In this analysis, performed in a Heaviside way, an intermediate factor, called a switching index

n, was introduced….

(e) On quantization and discretization: hypothesesIn this section, I will consider some rather interesting, and possibly controversial, implications of the transients that we visited above thanks to Catt, Davidson and Walton's derivations. The artefact that those transients had envelopes that were exponential or sine/cosine curves was the result of having them been sums of series of steps in the first place. Furthermore, they originated as series of steps from one, rather simple but fundamental, postulate—that of the existence of energy current that is never stationary but always moves with the speed of light (Catt's Theory of [

7]).Understanding this postulate and the various analyses of transients in electrical systems is important. It is crucial for settling with the idea of the world being quantized by virtue of energy currents being trapped between some reflection points, and the continuous pictures of the transients are just the results of some step-wise processes.

I deliberately use word ‘quantized' ….

….

For example, from my discussions with Prof Werner Hofer of Newcastle University, I came to the understanding that electron is a portion of space, surrounding the nucleus of an atom, which has trapped energy current, pretty much analogous to a capacitor!

4. Mathematical models for energy-modulated computing

(a) Modelling Wakefield experiment in Petri-netsIn this section,

….

….

There is a distinct similarity with the waveforms from the scope in the Wakefield experiment shown in

figure 6. Some discrepancy is caused by a bit coarse level of granularity

5. ConclusionMore than 125 years ago Oliver Heaviside stated that energy current was the primal standpoint. In this paper, we looked at the potential impact of the idea of energy current on the connection between electromagnetic theory and computing. This connection is manifold. It permeates through the notion of energy-modulated computing. It also drives the research into computing which is based on physical phenomena such as causality and encourages the engineers to develop or use the ‘right kind' of mathematics to build the bridge between the behaviour of signals in physics and exploiting this behaviour in computations. The bridge between the physics of electromagnetism and computing fundamentally lies in Time domain analysis and appropriate forms of discretization of processes in space and time (cf. geometric approach of Galileo and Newton [

27]). Immediate switching to Frequency domain analysis for pulse-based signals (and this is what we deal with in computers!) would bring a ‘wrong type' of mathematics on the way of physics and reality. This sounds controversial but this is what we could and should learn from Heaviside.What about more specific methodological innovation of this paper? We have now explored two types of step-wise physical processes that we can link with computing. One is associated with energy-current—this is a fast computing paradigm associated with the speed of light. An example is the energy-division in TLs—here we can form oscillations at super-Gigahertz frequencies on a chip. Another form is associated with the switching of logic gates, where we rely on mass effects such as movement of charge, and division of electrical energy associated with it. This is illustrated by the capacitor discharge via digital switching logic. Here our typical speeds are sub-Gigahertz. These two forms are orthogonal but can work together, for example in a nested way, like the second and minute hands of the clock. We could combine the TL discharge (step-wise discretization of an exponential—inner loop) with a logic circuit switching (step-wise discretization of hyperbolic discharge—outer loop).

This is a conjecture with which I conclude this paper. It is based on the stepwise process of TL models of capacitors by Ivor Catt and his associates and our stepwise processes with a ring oscillator discharging a capacitor, even a lumped one. These are two orthogonal discretization operators. The study of their superposition is a subject of our future work. This will open up some new dimensions for energy-modulated computing!

Besides, a potentially useful result of this paper in terms of modelling is the fact that Petri net unfolding can be interpreted as a waveform of signals whose states are associated with some places in the net.

AcknowledgementsI am grateful to Dr Christopher Donaghy-Spargo of Durham University for numerous stimulating interactions on the life and work of Oliver Heaviside and our regular chats about electromagnetism. I would also like to thank Mr Ivor Catt and Dr David Walton for opening the world of electromagnetics to me in 2013 through the prism of Catt Theory. I am also indebted to my research group at Newcastle, with whom we are exploring the arcades of energy-modulated computing. Last but not least, many thanks to the two anonymous reviewers for their thorough reading of the paper and producing invaluable comments and corrections.

Footnotes· One contribution of 13 to a theme issue ‘Celebrating 125 years of Oliver Heaviside's ‘Electromagnetic Theory’’.

· Accepted June 9, 2018.

· © 2018 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

References1.

↵1. Yakovlev A

. 2011 Energy-modulated computing. In Proc. Design Automation & Test in Europe (DATE), Grenoble, pp. 1–6. Piscataway, NJ: IEEE. (doi:10.1109/DATE.2011.5763216)

2.

↵1. Yakovlev A,

2. Ramezani R,

3. Mak T

. 2011

Apparatus and method for voltage sensing. US Patent application US13638330, 28.02.2011, granted US9121871B2 01.09.3.

↵1. Ramezani R,

2. Yakovlev A

. 2013 Capacitor discharging through asynchronous circuit switching. In Proc. IEEE 19th Int. Symp. on Asynchronous Circuits and Systems, Santa Monica, CA, pp. 16–22. Piscataway, NJ: IEEE. (doi:10.1109/ASYNC.2013.11)

4.

↵1. Kinniment DJ

. 2008

Synchronization and arbitration in digital systems. Chichester, UK: Wiley Publishing. ; http://www.ivorcatt.co.uk/x1bn.pdf5.

↵1. Kinniment DJ

. 2011

He who hesitates is lost. Newcastle upon Tyne, UK: Newcastle University, School of Engineering. http://www.ivorcatt.co.uk/x84gglitch.pdf6.

↵1. Catt I

. 1966 Time loss through gating of asynchronous logic signal pulses. IEEE Trans. Electron. Comput.

EC-15,108–111. (doi:10.1109/PGEC.1966.264407)7.

↵1. Catt I

. 1995

Electromagnetics 1. St Albans, UK: Westfields Press.8.

↵1. Catt I,

2. Davidson MF,

3. Walton DS

. 1978 Displacement current – and how to get rid of it. In Wireless World, pp. 51–52. http://www.ivorcatt.co.uk/x3b2.pdf

9.

↵1. Catt I

. 2013 Advances in electromagnetic theory. In Video recording of the Electromagnetism Seminar at Newcastle University, 9 October 2013. See http://async.org.uk/IvorCatt+DavidWalton.html.

10.

↵1. Walton D

. 2013 Maxwell's electromagnetic theory. In Video recording of the Electromagnetism Seminar at Newcastle University, 9 October 2013. See .

11.

↵1. Catt I

. 2013 The end of the road. Electronics World, The Centenary Issue

119, 72–74. Seehttps://www.electronicsworld.co.uk/magazine/centenary-issue.12.

↵1. Heaviside O

. 1892

Electrical papers,vol. I. London: Macmillan and Co., p. 438.13.

↵1. Shafik R,

2. Yakovlev A,

3. Das S

. 2018 Real-power computing. IEEE Trans. Comput.

67, 1445–1461. Early Access. (doi:10.1109/TC.2018.2822697)14.

↵1. Yakovlev A,

2. Vivet P,

3. Renaudin M

. 2013 Advances in asynchronous logic: from principles to GALS & NoC, recent industry applications, and commercial CAD tools. In Proc. Design Automation & Test in Europe (DATE), Grenoble, France, pp. 1715–1724. (doi:10.7873/DATE.2013.346)

15.

↵1. Heaviside O

. 1892.

Electrical papers,vol. II. London: Macmillan and Co., p. 201.16.

↵1. Catt I,

2. Davidson MF,

3. Walton DS

. 1979

Digital hardware design. London, UK: The Macmillan Press Ltd.17.

↵1. Sullivan CR,

2. Kern AM

. 2001 Capacitors with fast current require distributed models. In Proc. IEEE 32nd Annu. Power Electronics Specialists Conf., Vancouver, BC, pp. 1497–1503. Piscataway, NJ: IEEE. (doi:10.1109/PESC.2001.954331)

18.

↵1. Yakovlev A,

2. Kushnerov A,

3. Mokhov A,

4. Ramezani R

. 2014 On hyperbolic laws of capacitor discharge through self-timed digital loads. Int. J. Circ. Theor. Appl.

43, 1243–1262. (doi:10.1002/cta.2010)19.

↵1. Wang A,

2. Calhoun BH,

3. Chandrakasan AP

. 2006

Subthreshold design for ultra-low power systems. Berlin, Germany: Springer Verlag.20.

↵1. Nose K,

2. Sakurai T

. 2000 Optimization of VDD and VTH for low-power and high-speed applications. In Proc. Asia and South Pacific Design Automation Conf. (ASP-DAC), Yokohama, Japan, pp. 469–474. New York, NY: ACM(doi:10.1145/368434.368755)

21.

↵1. Xu Y,

2. Shang D,

3. Xia F,

4. Yakovlev A

. 2016 A smart all-digital charge to digital converter. In Proc. IEEE Int. Conf. on Electronics, Circuits and Systems (ICECS), Monte Carlo, pp. 668–671. Piscataway, NJ: IEEE. (doi:10.1109/ICECS.2016.7841290)

22.

↵1. Einstein A,

2. Podolsky B,

3. Rosen N

. 1935 Can quantum-mechanical description of physical reality be considered complete? Phys. Rev.

47, 777–780. (doi:10.1103/PhysRev.47.777)

13 December 2018

Volume 376, issue 2134

·

2. Energy-modulated computing·

3. Computing by accumulating and dividing energy·

4. Mathematical models for energy-modulated computing

Celebrating 350 years ofPhilosophical Transactions

Anniversary issue with free commentaries, archive material, videos and blogs.1.

On Heaviside's contributions to transmission line theory: waves, diffusion and energy fluxChristopher Donaghy-Spargo, Philosophical Transactions A

2.

Oliver Heaviside's electromagnetic theoryChristopher Donaghy-Spargo et al., Philosophical Transactions A

3.

Oliver Heaviside: an accidental time travellerPaul J. Nahin, Philosophical Transactions A

4.

Stochastic electromagnetic field propagation— measurement and modellingGabriele Gradoni et al., Philosophical Transactions A

Mark W. Verbrugge et al., Journal of The Electrochemical Society

Darryl Dunn et al., Journal of The Electrochemical Society

3.

A Current Supply with Single Organic Thin-Film Transistor for Charging SupercapacitorsVahid Keshmiri et al., ECS Meeting Abstracts

4.

Model-Based Investigation of Dual Energy Storage Selection for Advanced Start-Stop VehiclesZhenli Zhang et al., ECS Meeting Abstracts

·

PHILOSOPHICAL TRANSACTIONS A@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

I believe the issue may be found at

http://rsta.royalsocietypublishing.org/content/376/2134.The specific papers you referred to may be found at the following:

Christopher Donaghy-Spargo --

http://rsta.royalsocietypublishing.org/content/376/2134/20170457Alex Yakovlev --

http://rsta.royalsocietypublishing.org/content/376/2134/20170449Thanks again for your interest in Royal Society Publishing.

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Professor Massimiliano Pieraccini