Jekyll2022-01-24T21:52:01+00:00http://chrispinnock.com/feed.xmlChris PinnockPublications and articles by Chris PinnockOptimising Mash Temperature2021-06-22T18:41:30+01:002021-06-22T18:41:30+01:00http://chrispinnock.com/2021/06/22/optimising-mash-temperature<p>I'm pleased to announce that my article <em>Optimising Mash Temperature</em> has been published in the July 2021 edition of <a href="https://www.homebrewersassociation.org/zymurgy-magazine/">Zymurgy</a>.</p>
<h4><strong>Abstract</strong></h4>
<p>Temperature control is important at several stages of the brewing process. In this article, we discuss the temperature control of the mash and the strike formula used to estimate the temperature of the liquor added to the mash tun. By using this formula, it is possible to hit the sweet spot reliably between 149°F and 155°F to get an optimum extract from the grain.</p>
<h4><strong>Links</strong></h4>
<ul>
<li><a href="https://mydigitalpublication.com/publication/?m=7884&i=710938&p=32&ver=html5">Optimizing Mash Temperature</a> (requires AHA subscription)</li>
<li><em><a href="https://www.homebrewersassociation.org/zymurgy-magazine/july-august-2021/">Zymurgy</a>, The Magazine of the American Homebrewers Association, Jul/Aug 2021</em>, The Brewers Association.</li>
</ul>I'm pleased to announce that my article Optimising Mash Temperature has been published in the July 2021 edition of Zymurgy.An Experiment with Barley Wine2021-02-17T22:00:00+00:002021-02-17T22:00:00+00:00http://chrispinnock.com/2021/02/17/an-experiment-with-barley-wine<p><em>with Phill Turner</em></p>
<p>I'm pleased to announce that our paper on Barley Wine has been published in the March 2021 edition of <a href="https://www.homebrewersassociation.org/zymurgy-magazine/">Zymurgy</a>.</p>
<div class="wp-block-image">
<figure class="aligncenter size-large"><img width=400 src="/assets/2021/02/img_8743.jpg" alt="" class="wp-image-12052" /><br />
<figcaption>Left to right: Nottingham, Scottish, Thomas Hardy, Trappist, Saison, London Ale</figcaption>
</figure>
</div>
<h4><strong>Abstract</strong></h4>
<p>We brewed a large batch of English barley wine and split it into six different batches. Each batch was fermented with a different yeast. The barley wines were held at the same conditions for fermentation, then they were bottled with fresh yeast. We’ve conducted tastings at our beer circle a few months later and with some beer judges one year on from the brew day. In this paper, we present our findings.</p>
<h4><strong>Background</strong></h4>
<p>In 2019, Phill and I brewed a barley wine. We split it into six batches and pitched the following yeasts:</p>
<ul>
<li>Scottish Ale (WY1728) - the yeast we would usually use for Barley Wine</li>
<li>Nottingham (LalBrew Dry)</li>
<li>French Saison (WY3711)</li>
<li>Trappist (WY3787)</li>
<li>Thomas Hardy (WLP099)</li>
<li>London Ale (WY1028)</li>
</ul>
<p>The paper concludes that, at least in our experiment, the Scottish Ale yeast produces the best result followed by the Thomas Hardy yeast. The Saison yeast produces a good beer but it isn't really a Barley Wine. If anything it is a "Belgian Barley Wine". The Nottingham yeast didn't produce anything worth drinking.</p>
<h4><strong>Link</strong></h4>
<ul>
<li><a href="https://mydigitalpublication.com/publication/frame.php?i=693680&p=&pn=42&ver=html5">An Experiment with Barleywine</a> (requires AHA subscription)</li>
<li><em><a href="https://www.homebrewersassociation.org/zymurgy-magazine/">Zymurgy</a>, The Magazine of the American Homebrewers Association, Mar/Apr 2021</em>, The Brewers Association.</li>
</ul>with Phill Turner I'm pleased to announce that our paper on Barley Wine has been published in the March 2021 edition of Zymurgy.Learning Russian Handwriting2020-01-15T14:15:00+00:002020-01-15T14:15:00+00:00http://chrispinnock.com/2020/01/15/book-russian-handwriting<img class="alignleft wp-image-8588 size-medium" style="border:2px solid #000000;" src="/assets/2020/01/title_page.png" alt="" width="212" height="300" />
<h4><strong>What is it about?</strong></h4>
<p>I learnt the art of Russian handwriting in three weeks in 2017. This book will show you how to handwrite the Cyrillic letters and quickly get to grips with Russian handwriting. It is organised in digestible chunks so that you can learn quickly. In the book, we also cover the Belarusian, Bulgarian, Ukrainian and pre-revolution alphabets.</p>
<p>My book shows you how to handwrite the <a href="/2014/01/27/the-cyrillic-alphabet/">Cyrillic letters</a> and quickly get to grips with Russian handwriting. It is organised in digestible chunks so that you can learn quickly. The Belarusian, Bulgarian, Ukrainian and pre-revolution alphabets are also covered. Once I'm finished I might add Serbian and other alphabets.</p>
<p>When I started a new <a href="https://www.russiancentre.co.uk">Russian school</a> and it was clear that I would have to learn Russian handwriting in order to keep up with the pace and also improve my studying velocity. I learnt the basics in three weeks.</p>
<p>About a year ago I started working on the book to gather my thoughts on this process. In the summer the work really started when I bought an iPad because I could easily render handwriting without having to resort to photographs and scans.</p>
<h4><strong>Where can I get it?</strong></h4>
<p>The book is available from <a href="https://leanpub.com/learningrussianhandwriting">Leanpub </a>and it is in the process of being written (see the <a href="/books/learningrussianhandwriting/">ChangeLog</a>). Version 1.4 was published in March 2020 when the book was 50% complete. I have generated two versions since, but I'm not ready to republish. There's a lot of work to do but 90% of the text is complete. Work halted abruptly when I fractured my arm but much of the work to do is revision of the images which will be completed in 2022.</p>
<h4><strong>Links</strong></h4>
<ul>
<li><a href="https://leanpub.com/learningrussianhandwriting">Get the book at Leanpub</a></li>
<li><a href="/books/learningrussianhandwriting/">Book Resources</a> including downloadable practice sheets on this site and ChangeLog of the development version</li>
</ul>Digital Economy and GDPR2017-03-09T13:34:00+00:002017-03-09T13:34:00+00:00http://chrispinnock.com/2017/03/09/digital-economy-gdpr<p>In 2016, I met Stephen Cameron at the <a href="https://www.bcs.org/membership/member-communities/bcs-it-leaders-forum/">BCS ELITE (now IT Leaders) Forum</a> at an event about the EU's <a href="https://gdpr-info.eu">General Data Protection Regulation</a> (GDPR). Over the subsequent months, we read the GDPR in full and wrote a paper on its effect on the digital world. It appeared in the online telecommunications journal <a href="https://www.lightreading.com">Light Reading</a> in March 2017.</p>
<h4><strong>Abstract</strong></h4>
<p>The EU General Data Protection Regulation (GDPR), which is due to come into force in May 2018, will affect every organization that uses the data of European citizens. In this article, Stephen Cameron and Chris Pinnock examine the implications of GDPR, consider the changing political landscape and analyze how businesses will be affected by the new regulation.</p>
<h4><strong>Link</strong></h4>
<ul>
<li><a href="http://www.lightreading.com/oss-bss/subscriber-data-management/the-digital-economy-and-gdpr/a/d-id/730582?">Article at Light Reading</a></li>
</ul>In 2016, I met Stephen Cameron at the BCS ELITE (now IT Leaders) Forum at an event about the EU's General Data Protection Regulation (GDPR). Over the subsequent months, we read the GDPR in full and wrote a paper on its effect on the digital world. It appeared in the online telecommunications journal Light Reading in March 2017.Local Supersoluble Systems2003-07-31T14:49:00+01:002003-07-31T14:49:00+01:00http://chrispinnock.com/2003/07/31/local-supersoluble-systems<p><!-- wp:paragraph --></p>
<p>Local systems of Locally Supersoluble Finitary Groups, <em>Glasgow Math. J.</em> <strong>45</strong> (2003) 239-242.</p>
<p>This paper was based on work in my PhD thesis conducted under the supervision of <a href="http://www.genealogy.ams.org/id.php?id=51538">Prof B.A.F. Wehrfritz</a> and with the support of an EPSRC grant.</p>
<h4><strong>Abstract</strong></h4>
<p>We show that locally supersoluble finitary groups over certain division rings (e.g. fields) have local systems of hypercyclic normal subgroups.</p>
<h4><strong>Links</strong></h4>
<ul>
<li><a href="http://journals.cambridge.org/download.php?file=%2FGMJ%2FGMJ45_02%2FS0017089503001198a.pdf&code=d2273ea1c171142d589a28152cc6112a">Local systems of Locally Supersoluble Finitary Groups</a>, <em>Glasgow Math. J.</em> <strong>45</strong> (2003) 239-242.</li>
</ul>Local systems of Locally Supersoluble Finitary Groups, Glasgow Math. J. 45 (2003) 239-242. This paper was based on work in my PhD thesis conducted under the supervision of Prof B.A.F. Wehrfritz and with the support of an EPSRC grant.Generalized Engel elements2003-01-23T13:49:00+00:002003-01-23T13:49:00+00:00http://chrispinnock.com/2003/01/23/generalized-engel-elements<p>
<div class="wp-block-image">
<figure class="alignleft size-large is-resized"><img src="/assets/2003/01/friedrich_engel.jpg" alt="" class="wp-image-11086" width="300" height="300" /><br />
<figcaption><a href="https://en.wikipedia.org/wiki/Friedrich_Engel_(mathematician)">Engel</a></figcaption>
</figure>
</div>
<p>Generalized Engel elements in Group Theory, <em>J. Group Theory</em> <strong>6</strong> No. 1 (2003) 69-81.</p>
<p>In the theory of nilpotent groups, we have the notions of right Engel elements and left Engel elements, defined in terms of repeating commutators. The hypercentre and the Hirsch-Plotkin radical are subsets of the sets of right and left Engel elements respectively. </p>
<p>Towards the end of my PhD, we were considering analogues of Engel elements but for supersoluble conditions. We define left and right S-Engel elements. There is a supersoluble analogue of the hypercentre, whose members are right S-Engel elements and we define an analogue of the Hirsch-Plotkin radical, whose members are left S-Engel elements. These analogue subgroups are precisely the relevant S-Engel elements in certain cases (such as a polycyclic-by-finite group).</p>
<p>This paper was based on work in my PhD thesis conducted under the supervision of <a href="http://www.genealogy.ams.org/id.php?id=51538">Prof B.A.F. Wehrfritz</a> and with the support of an EPSRC grant.</p>
<h4><strong>Abstract</strong></h4>
<p>This paper provides a super soluble analogue of Engel theory. We show that the theory works for finite groups and list some further results pertaining to finitary skew linear groups.</p>
<p><!-- /wp:paragraph --></p>
<p><!-- wp:paragraph --></p>
<p><em>Dedicated to Bert Wehrfritz on his 60th birthday</em>.</p>
<h4><strong>Link</strong></h4>
<ul>
<li><a href="http://www.degruyter.com/view/j/jgth.2003.6.issue-1/jgth.2003.006/jgth.2003.006.xml">Generalized Engel elements in Group Theory</a>, <em>J. Group Theory</em> <strong>6</strong> No. 1 (2003) 69-81.</li>
</ul>Engel Generalized Engel elements in Group Theory, J. Group Theory 6 No. 1 (2003) 69-81. In the theory of nilpotent groups, we have the notions of right Engel elements and left Engel elements, defined in terms of repeating commutators. The hypercentre and the Hirsch-Plotkin radical are subsets of the sets of right and left Engel elements respectively. Towards the end of my PhD, we were considering analogues of Engel elements but for supersoluble conditions. We define left and right S-Engel elements. There is a supersoluble analogue of the hypercentre, whose members are right S-Engel elements and we define an analogue of the Hirsch-Plotkin radical, whose members are left S-Engel elements. These analogue subgroups are precisely the relevant S-Engel elements in certain cases (such as a polycyclic-by-finite group). This paper was based on work in my PhD thesis conducted under the supervision of Prof B.A.F. Wehrfritz and with the support of an EPSRC grant.Lawless Finitary Groups2002-05-01T14:49:00+01:002002-05-01T14:49:00+01:00http://chrispinnock.com/2002/05/01/lawless-finitary-groups<div class="wp-block-image">
<figure class="alignleft size-large is-resized"><img src="/assets/2002/05/pruferheinz_1930_jena.jpg" alt="" class="wp-image-11090" width="300" height="300" /><br />
<figcaption><a href="https://en.wikipedia.org/wiki/Heinz_Prüfer">Prüfer</a>, <a href="https://commons.wikimedia.org/wiki/File:Prüfer,Heinz_1930_Jena.jpg">CC Gerhard Hund</a></figcaption>
</figure>
</div>
<p>Lawlessness and Rank Restrictions in Certain Finitary Groups, <em>Proc. Amer. Math. Soc.</em> <strong>130</strong> (2002) 2815-2819.</p>
<p>This paper was based on work in my PhD thesis conducted under the supervision of <a href="http://www.genealogy.ams.org/id.php?id=51538">Prof B.A.F. Wehrfritz</a> and with the support of an EPSRC grant.</p>
<h4><strong>Abstract</strong></h4>
<p>We give two applications of the recent classification of locally finite simple finitary skew linear groups. We show that certain irreducible finitary skew linear groups of infinite dimension generate the variety of all groups and have infinite Prüfer rank.</p>
<h4><strong>Link</strong></h4>
<ul>
<li><a href="http://www.ams.org/journals/proc/2002-130-10/S0002-9939-02-06673-X/S0002-9939-02-06673-X.pdf">Lawlessness and Rank Restrictions in Certain Finitary Groups</a>, <em>Proc. Amer. Math. Soc.</em> <strong>130</strong> (2002) 2815-2819.</li>
</ul>Prüfer, CC Gerhard HundSupersolubility and Finitary Groups2000-11-02T18:18:00+00:002000-11-02T18:18:00+00:00http://chrispinnock.com/2000/11/02/phd<p>In 2000, I completed a PhD in Finitary Group Theory under the supervision of <a href="http://www.genealogy.ams.org/id.php?id=51538">Prof B.A.F. Wehrfritz</a>. My examiners were <a href="https://www.queens.ox.ac.uk/academics/neumann">Dr Peter M Neumann, O.B.E.</a> and <a href="http://web.mat.bham.ac.uk/P.J.Flavell/">Prof Paul Flavell</a>. </p>
<h4><strong>Abstract</strong></h4>
<p>We generalize Platonov's theorems on linear groups of finite Prüfer rank and linear groups satisfying non-trivial laws to certain finitary skew linear groups. We show that there are no transitive finitary permutation groups of infinite degree with finite Prüfer rank. We also show that an irreducible finitary linear group of infinite dimension has infinite Prüfer rank and generates the variety of all groups.</p>
<p>We show that a locally supersoluble group that is either a transitive finitary permutation group on an infinite set or an irreducible finitary skew linear group of infinite dimension, is a <em>p</em>-group for some suitably chosen prime <em>p</em>.</p>
tent by Abelian group that is either a transitive finitary permutation group on an infinite set or an irreducible finitary skew linear group of infinite dimension is a <em>p</em>-group for some suitably chosen prime <em>p</em>.</p>
<h4>Links</h4>
<ul>
<li><a href="/assets/2015/01/thesis.pdf">PDF</a> format</li>
<li><a href="/assets/2015/01/supersolubility-and-finitary-groups-kindle.pdf">Kindle-friendly PDF</a> format</li>
</ul>In 2000, I completed a PhD in Finitary Group Theory under the supervision of Prof B.A.F. Wehrfritz. My examiners were Dr Peter M Neumann, O.B.E. and Prof Paul Flavell.Irreducible and Transitive Finitary Groups2000-03-01T13:49:00+00:002000-03-01T13:49:00+00:00http://chrispinnock.com/2000/03/01/irreducible-and-transitive-finitary-groups<p>Irreducible and Transitive Locally-Nilpotent by Abelian Finitary Groups, <em>Arch. Math.</em> <strong>74</strong> (2000) 168-172.</p>
<p>This paper was based on work in my PhD thesis conducted under the supervision of <a href="http://www.genealogy.ams.org/id.php?id=51538">Prof B.A.F. Wehrfritz</a> and with the support of an EPSRC grant.</p>
<h4><strong>Abstract</strong></h4>
<p>We show that a locally-nilpotent by abelian group that is either a transitive finitary permutation group on an infinite set or an irreducible finitary skew linear group of infinite dimension, is a <em>p</em>-group for some suitably chosen prime <em>p</em>.</p>
<h4><strong>Link</strong></h4>
<ul>
<li><a href="http://link.springer.com/article/10.1007/s000130050427">Irreducible and Transitive Locally-Nilpotent by Abelian Finitary Groups</a>, <em>Arch. Math.</em> <strong>74</strong> (2000) 168-172.</li>
</ul>Irreducible and Transitive Locally-Nilpotent by Abelian Finitary Groups, Arch. Math. 74 (2000) 168-172.Finitary Permutation Groups1999-11-01T13:14:00+00:001999-11-01T13:14:00+00:00http://chrispinnock.com/1999/11/01/finitary-permutation-groups<h3>Finitary Permutation Groups Study Notes</h3>
<p>During my PhD, I participated in various study groups, one of which was the Combinatorics Study Group. The members (students, postdoc researchers and academics) would spend Wednesday afternoons counting things, studying graphs, groups and other mathematical objects. They would then adjourn to the Old Globe on Mile End Road (sadly now a Ladbrokes) where the real ales would be drained.</p>
<p>Permutations arise in the study of Combinatorics and Finitary Groups were key to my PhD study. I put these notes together as a knowledge session for the group. There is a proof that uses the Axiom of Choice and if I recall correctly, this led to a pub discussion where one of the senior academics declared they didn't believe it. For those of you that know some set theory, you will know that this is essentially a religious discussion.</p>
<p>I cannot actually remember when I wrote these, but they site <a href="http://cameroncounts.wordpress.com">Peter</a>'s Permutation Groups book so it must be after 1999.</p>
<h4><strong>Abstract</strong></h4>
<p>A <em>finitary permutation group</em> is a natural generalization of a finite permutation group. The structure of a transitive finitary permutation group is surprisingly simple when its degree is infinite. Here we study primitivity, following P. M. Neumann’s work in the 1970s. We also study generalized solubility conditions on these groups. These notes arose from lectures aimed at an audience who had seen some basic permutation group theory, but little abstract group theory. </p>
<h4><strong>Links</strong></h4>
<ul>
<li><a href="/assets/2015/01/fpg.pdf">PDF</a> format</li>
<li><a href="/assets/2015/01/finitary-permutation-groups-kindle.pdf">Kindle-friendly PDF</a> format</li>
</ul>Finitary Permutation Groups Study Notes During my PhD, I participated in various study groups, one of which was the Combinatorics Study Group. The members (students, postdoc researchers and academics) would spend Wednesday afternoons counting things, studying graphs, groups and other mathematical objects. They would then adjourn to the Old Globe on Mile End Road (sadly now a Ladbrokes) where the real ales would be drained. Permutations arise in the study of Combinatorics and Finitary Groups were key to my PhD study. I put these notes together as a knowledge session for the group. There is a proof that uses the Axiom of Choice and if I recall correctly, this led to a pub discussion where one of the senior academics declared they didn't believe it. For those of you that know some set theory, you will know that this is essentially a religious discussion.