Few words about me:

From very childhood I loved computers, electronics, lasers, sulfuric acid and liquid nitrogen. I always wanted to be making microchips, UAVs and see nuclear explosion.

Now I am doing software engineering and in the spare time - some microelectronics and physics/chemistry experiments.

I live and work in Russia, Moscow.

Blade Runner 2049

Impeccable sci-fi setting and story yields it solid 10/10 rate in my view. Hits perfect spot of what I would consider ideal sci-fi movie. Would recommend to watch it in the morning, with lowest theater occupancy.
October 6, 2017

Is 16 terabytes Enough For Anyone?

At some point of life everyone starts to feel that 16Tb storage is no longer enough and it's time to expand it. I am a little scared to think how did I managed to currently occupy 12.68Tb. But there is no time to investigate, let's throw some hardware at the problem!

After routinely adding yet another 4Tb disk to RAID6 array and trying to resize ext4 partition I was puzzled by the message:
root@lbox2:/var$ resize2fs /dev/md1
resize2fs 1.43.4 (31-Jan-2017)
resize2fs: New size too large to be expressed in 32 bits
That was totally unexpected. EXT4 does not support partitions larger than 16Tb? It appeared that it did not up until somewhat recent time. 5 years ago that would have been a brick wall, 2 years ago I would have to wrestle a little with bleeding edge resize2fs/kernel and now it all works on-the-fly out of the box. One just need to convert this ext4 partition to 64-bit format:
root@lbox2:/var$ resize2fs -b /dev/md1
resize2fs 1.43.4 (31-Jan-2017)
Converting the filesystem to 64-bit.
The filesystem on /dev/md1 is now 3907015424 (4k) blocks long.

root@lbox2:/var$ resize2fs /dev/md1
resize2fs 1.43.4 (31-Jan-2017)
Resizing the filesystem on /dev/md1 to 4883769280 (4k) blocks.
The filesystem on /dev/md1 is now 4883769280 (4k) blocks long.

root@lbox2:/var$ mount /var/bigfatdisk

root@lbox2:/var/bigfatdisk$ df . -H
Filesystem      Size  Used Avail Use% Mounted on
/dev/md1         20T   14T  5.9T  71% /var/bigfatdisk

xy@lbox2:~$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md1 : active raid6 sdf1[0] sdg1[7] sdh1[6] sdc1[5] sdb1[3] sde1[2] sda1[1]
      19535077120 blocks super 1.2 level 6, 128k chunk, algorithm 2 [7/7] [UUUUUUU]
      bitmap: 1/466 pages [4KB], 4096KB chunk, file: /var/md1_intent.bin

unused devices: <none>

I remember in the late 90's i've been to ftp.cdrom.com - it had enormous 0.5Tb array: it felt like absolutely insane volume of data (I had 850Mb HDD at the time). Probably readers of this article in 2037 would have 1024-layer 3D phase-change memory with 64Tb in 2.5" drive. Good for you, readers from the future... Although it is also possible that popularization of online-content, streaming and cloud apps will make it almost obsolete to have large local storage (with a few exceptions).

BTW since I went for softraid at home about 8 years ago - I had not a single HDD failure (about 50 hdd-years). Still pays off - much less worries about at least 1 thing...
September 26, 2017

Golden autumn

September 14, 2017

Aftermath of X9.3 solar flare

Solar minimum they said... It will be spotless they said...
September 10, 2017

More Deep Space

Finished processing photos from my last trip so we all can see the results.

Let's start from Milky Way near M6, M7 (exposure 85x3.2s):
September 6, 2017

Deeper look at the center of our galaxy

This is my first experience in deep sky photography. Best place to start is center of our galaxy - where deep sky objects are densely packed.

128 shots @3.2 seconds exposure each. Sony NEX-5 with Canon FD 55mm F1.2@2.2. All frames were stacked using DeepSkyStacker, plate solving and annotation is done by All Sky Plate Solver. There were 2 shooting sessions for this subject - both at Tenerife mountains, at heights 1500 and 2200 meters. Sky glow was twice brighter at 1500m, so this batch of 106 shots was not used in final stacking. Even at 2200m conditions were far from perfect - wind from Africa carried visible dust which contributed to background brightness.

Next time camera with more modern sensor will help as well as less-bright (!!) lens: F1.2 was making bright stars too large even when stopped down to F2.2. And surely, sky tracking mount will allow much longer exposures and higher image SNR.

On mouse over - annotation. Higher resolution on click.
September 3, 2017

Chemiluminescence of CPPO with dyes

Finally it worked! It is much more complicated than Luminol reaction. The hardest logistical part was finding CPPO (Bis-[2,4,5-trichloro-6-(pentyloxycarbonyl)phenyl]oxalate). Dyes are Fluorescein and Rhodamine R/6G. Catalyst/acidity regulator is Sodium Acetate (more common bases like NaOH or NaHCO3 were not working). It's conventional synthesis from baking soda and acetic acid is messy and painfully slow - next time going to try synthesis from sodium hydroxide. Sodium acetate is actually a pretty interesting chemical as itself due to interesting phase transitions of it's hydrate - some day I will have some fun with it.

Picking solvent for reaction is another story: components are almost insoluble in water so we have to use some organic solvent. In DMSO (which worked nicely with Luminol) there was some aggressive side reaction. Ethyl acetate has extremely bad smell and is quite unsafe. One of the best and final picks was dibutyl phthalate.

This is not the end of my experiments with CPPO, I still have 99.5g left

August 15, 2017

Daylight astronomy - Venus

It is believed that city glow at night is a no-go for astronomy. But what about daylight?
I've managed to observe and photograph Venus at noon, when sun was at it's brightest. Without any reference points in the sky and without motorized mount - it's a challenge to spot Venus at daylight. In my binoculars (11x70, with ~4.5° FOV) it was taking couple of minutes using Stellarium and ground reference points.

After that - few more minutes to spot it using main telescope. Venus is no longer a thin sickle - after 3 months Venus and Earth have gone quite far apart on their orbits around the sun:

What's next? Mercury? That's gonna be slightly dangerous... :-)
July 24, 2017

Sun and AZ5

Finally my telescope is on a stable mount - TS AZ5:

Farewell photo of sun spot #2665 in Hβ (486.1nm). Solar minimum is almost there so we are not going to see lots of sunspots during the nearest years.

July 16, 2017

Fuming nitric acid synthesis

It is not that easy to buy 100% nitric acid due to it's instability (and hence special requirements for transportation) and wide range of it's applications. Distillation does not allow one to get above 68%. If we cannot live without 100% - we'll have to synthesize it ourselves. Last time I did that using quite inconvenient and unsafe method (decomposition of lead(II) nitrate, then dissolving mix of liquid nitrous oxides in 68% nitric acid. This process was too scary to describe in detail

This time I went for conventional and relatively safer route: potassium nitrate (100g) + 98% sulfuric acid (125ml, ~50% excess). You can then distill nearly 100% pure nitric acid.

Final result was reached much easier and faster. Yield was 50ml (which is ~50%, had no more time and ice to continue the process). Next time I will ether have to try something more high-tech (like Peltier cooling with Liebig condenser - Graham's condenser seems to be an overkill and strictly speaking you cannot use it at this angle), or run the process at winter (but it's probably not a good idea to store >100ml of 100% nitric acid due to it's instability).

I've tried a bit of final product right away by etching Texas Instruments IC with very chemically durable plastic.

July 5, 2017