The temperature at Twenthe Airport has gone up to
13.5° Celsius, which breaks the previous record of 12.9° on this date
I got a 2Gbyte DDR3
SDRAM memory module from a fellow TkkrLab member and installed it in FJF2 following the YouTube video How to upgrade ram of Acer Aspire One D270. Easy! Do it yourself. I ran
some memory test to check the memory module before closing it. Reconnecting the
keyboard (twice) was the hardest part.
Paintings and such
Today, we spend some time cleaning the former home of my mother now that we are
in the process of selling the house. I took some paintings and objecs with me.
- Painting of a brook between trees, signed with 'H Kooy'.
- Still life paiting with fan.
- Painting of a bridge by a brother of my mother.
- Print Stadhuis Woerden 48/50I in frame.
- Framed picture Woerden: R.K.kerk en kasteel vanaf de toren Petruskerk.
- Cupper bowl with fish design.
- Print of Chinese ink painting with proverb sealed in some plastic.
- Bredemijer teapot.
- Two wooden egg cups.
- Package with ten pairs of bamboe shopsticks. Made in Taiwan.
- Fan from China.
- Iron on beads figure made by Annabel.
- Pen in the form of an injection tube.
- Extension cord.
- Some spices.
- Glass marble that I started to carry in my pocket.
I have been looking at the Tropy application
to see if I could use it for my research on Peter Struycken. It has some interesting features. It allows you organize
your images and allows you to add meta data and notes to these, including
selections of them. You can export the data as JSON and the notes are stored with a subset of HTML, which makes it possible to parse them. I want to extract data from
the images and have a way to relate, to correlate, and to condens them into
well established and supported facts. I also want to go from the facts back to
the data and the images they are based on. It seems that Tropy does not support
this. This afternoon, I discovered that it is possible to define templates
and base these on all kinds ontologies. I had some look at Linked Open Vocabularies and the GND ontology. These are based on Resource Description Framework. (On Hacker News there was some discussion about the semantic web.) I find this model a little limited and rather
cumbersome to work with. I thinking about representing the data in the images
with (nested) bullet lists in the notes and write some software to extract
2-state 4-color BLB
Last Wednesday, I read the blog Another New Record in Self-Cleaning Turing Machines, which is about a
new record breaking 2-state 4-color Turing Machine that is a Blanking Beaver, a kind of Busy Beaver. In the past two days, I have been trying to analyze it. This
evening, I found that it calculates the following Collatz like sequence:
n = 1; m = 1;
if ((n % 2) == 1)
if (m == 2)
n = 1;
n = 2 + 5 * (n + m) / 2;
m = 1;
n = 1 + 5 * n / 2;
The steps it took me to find this can be found in this
program. I started with an interpretting implementation for the Turing
machine using a compressed representation of the tape. The idea that in case
a number of cells are given the same 'colour' (symbol) to represent it as a
single cell with a number representing the count. The implementation is found
in the function interpretter. I ran this to get an idea of the
patterns that occured. At one point, I replaced the count (in the printout)
by a star character and discovered some repeating patterns. I decided to
write a version where the turing machine is hard code. See the function
hard_coded1. At one point, I made it print out the transitions from
state with colour under the head to next state and next colour under the head.
This showed that there were only a limited number of transitions. I used this
to construct the function hard_coded2 where they are shown in the
comments. I added labels for all state-colour combinations and a goto
statements for the transistions. In the function hard_coded3 I
reordered the statements such that state-colour combinations that often
occured to follow each other appeared below each other. I also added
while-loops for repeating state-colour combinations, which I rewrote in a
more compact form. (The while-loops can be found as comments in the code.)
This resulted in less output to be printed, but I took care that the lines in
the input still matched those generated with the earlier functions, to make
sure I had not introduced errors. I studied the output and noticed some
repeating patterns. This lead to the implementation of hard_coded4
function that tries to reimplement the behaviour starting from the 'A'-state,
'0'-colour combination. I already had noticed that there was a slight
difference depending on the number of ones on the left tape were odd or even.
(It took me some effort to get the number of intermediates steps calculated
correctly.) However, it did not result in the expected cleaning of the tape.
This lead to the development of the function hard_coded5 which does
not make a difference between whether the number of ones is odd or even, but
stops a little earlier. Now it did produce the expected cleaning of the tape
(not exactly). Through analyzing the output produced by this function, I
wrote the calc function, which is also shown above. The calculation
of the n variable is derived from the code of hard_coded5 and
the calculation of the m variable is based on analyzes of the output.
It is since last year September 2 that Conny and I went looking for border poles.
This afternoon, we continued our search. We were surprised to find several
border poles that we missed last year as they were clearly visible now. For
sure the amount of overgrowth is much less than in the four months ago. (I had
entered the location of the border poles we wanted to find in a GPX file and
unloaded it to my Galaxy Tab 3
tablet.) We encountered the following border poles:
- At 14:14, pole 25.
- At 14:21, pole 24-II.
- At 14:28, pole 26 (again).
- At 14:48, pole 26-V.
- At 14:54, pole 27 (again).
- At 14:58, pole 28.
- At 15:04, pole 29 (again).
- At 15:08, pole 30.
- At 15:13, pole 31 (again).
- At 15:15, pole 31-I (again).
- At 15:21, pole 31-II.
- At 15:25, pole 31-III.
Last Saturday, the lock-down with respect to non-essential shops came to an
end. This morning, I could not resist my urge to visit charity shop Het Goed on my way to the office. At 10:10, I bought the
- De Pythagoras Code: het beste uit een halve eeuw wiskunde voor
liefhebbers written by Alex van den Brandhof and A.J. Brandhof in
Dutch and published by Bert Bakker in 2011,
ISBN:9789035136465, for € 4.05.
- Architektur der Welt: Maya, Guatemala, Honduras, Yukatan, Volume 8
written by Henri Stierlin in German and published by Taschen in 1964 for
- Architektur der Welt: Das alte Mexiko, Volume 2 written by
Henri Stierlin written in German and published by Taschen in 1967 for
Today is a palindrome date when written
according to the D(D)-M(M)-YY format: 22-11-22 and the YY.(M)M.(D)D formats:
22.1.22. The previous such date was November 12,
This afternoon, I visited Bookshop Broekhuis
where at the top floor, I saw the exhibition
from Fotocollectief Photophever. I liked some of the pictures by
This afternoon, Conny and I continued our search for
border poles. We first visited Dutch
trigonometric point 299308 which is located at X-RD 266010.3554 Y-RD
485167.1394 52° 20' 35.47425" North, 7° 00' 58.74302" East. We found it at
14:27. We look around the area before going to the border. There we encountered
the following border poles:
We searched for the two poles 33, but failed to find them.
- At 15:04, pole 32.
- At 15:12, pole 32-I.
- At 15:16, pole 32-II.
- At 15:19, pole 32-III.
- At 15:39, pole 43 (N) and pole 43 (D).
- At 15:42, pole 42.
- At 15:44, pole 41-III.
- At 15:45, poles 41-II and 41-I.
- At 15:48, pole 41.
- At 15:51. pole 40.
- At 15:55, pole 39.
- At 16:14, pole 44 (D).
- At 16:15, pole 44 (N).
I made the test at 16 Personalities and according to the test I am a
the following details: 72% introvert, 63% intuitive, 59% thinking,
57% prospecting, and 51% assertive. This matches with what I concluded on
August 16, 2002. It looks like this test is
a range version of the Myers–Briggs Type Indicator, which has been critized that there
is little evidence for dichotomies.
Today, I am 22,000 days old. I have decided to celebrate this day on a smaller
scale than the day I was 20,000 days old. I
have bought some tompouce
for us and some stroopwafels to treat my colleagues tomorrow when I will be in the office
Addition: A colleague of mine suggested the term kilo days.
At 12:15, I bought the following books from charity
shop Het Goed:
- Ulysses: [in Two Volumes]., Volume 2 written by James Joyce in English and published by The Odyssey Press in 1932 for
- De vijfde lijn written by Steven Aalders and Robert van Altena, illustrations by Peter Cox,
written in Dutch and published by Prometheus in 2017,
ISBN:9789044634204, for € 3.95.
- Sex at Dawn: How We Mate, Why We Stray, and
What It Means for Modern Relationships written by
Christopher Ryan and Cacilda Jetha in English and published by
HarperCollins in 2011, ISBN:9780061707810, for € 2.85.
Buning - Djokja
I discovered that the edition of Ulysses that I bought yesterday is much more
worth than what the half Euro I paid for it. I do not have the first volume.
The two volumes together are worth about € 50.00. On the first title
page it has a round paper sticker with the words 'Buning' and 'Djokja'. This
could be a bookstore label of a Buning bookshop in Yogyakarta. Some simalar bookstore labels can be found on the (Dutch)
page Librariana Deel 28 (2011) / Boek- en leescultuur in Nederlands Indië
by Lisa Kuitert. But it could also be some personal label, because it is
also found on the back of a watercolour Javanese scene by the artist Jan Christiaan Poortenaar. Anyway, it looks
like the book has been in Yogyakarta. I wonder how it arrived her in Enschede.
At 17:31, I collected the book Cain's Jawbone written by Edward Powys Mathers in English and
published by Unbound in 2021,
ISBN:9781800180796, which I had bought on Tuesday, January 18, 2022 at 10:22
from bookshop Broekhuis for € 14.95.
This afternoon, Conny and I continued our search for
border poles. We first made a stop to search
for trigonometric point 259308 which is located at X-RD 265003.7806 Y-RD
473066.1554 552° 14' 04.79124" North, 6° 59' 51.38138" East. At 13:26, we
found a red circle on the bike path but it did not have a bolt. (At home, I
discovered that it was not the trigonometric point we were looking for.) We
spend some time looking from the border poles 32-IV, 33, 33-I, and 33-II, but
did not find anything. Later, I returned to the area, because due to my own
stupidity, I lost a key, which I did not find as I had expected. We continued
to the border crossing between Denekamp and Nordhorn, which turned out to be very busy with a lot of German people
visiting the shops at the Dutch side of the border. There we encountered the
following border poles:
- At 14:37, pole 47.
- At 14:46, pole 46 (N)
- At 14:48, pole 46 (D)
This months interesting links
| December 2021
| February 2022
| Random memories