Previous Up Next

Diary, January 2022

Sun Mon Tue Wed Thu Fri Sat
  2   3   4   5   6   7   8
  9  10  11  12  13  14  15
 16  17  18  19  20  21  22
 23  24  25  26  27  28  29
 30  31

Saturday, January 1, 2022

13.5° Celsius

The temperature at Twenthe Airport has gone up to 13.5° Celsius, which breaks the previous record of 12.9° on this date in 2012.

Wednesday, January 5, 2022

Memory upgrade

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.

Friday, January 7, 2022

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. Among them:

Tuesday, January 11, 2022


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 these.

Friday, January 14, 2022

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;
    while (true)
        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.

Sunday, January 16, 2022

Border poles

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:

Monday, January 17, 2022


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 following books:

Saturday, January 22, 2022

Palindrome date

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, 2021.

Fotocollectief Photophever

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 Marek Hardens.

Sunday, January 23, 2022

Border poles

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.

Monday, January 24, 2022


I made the test at 16 Personalities and according to the test I am a INTP with 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.

Tuesday, January 25, 2022


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 again.

Addition: A colleague of mine suggested the term kilo days.

Wednesday, January 26, 2022


At 12:15, I bought the following books from charity shop Het Goed:

Thursday, January 27, 2022

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.

Friday, January 28, 2022


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.

Sunday, January 30, 2022

Border poles

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:

This months interesting links

Home | December 2021 | February 2022 | Random memories