Autor: Gerhard

I still have to follow up.

Depending on the camera it is interesting to photograph objects under UV light.

Photographic images are developed on natural leaves through the action of photosynthesis.

The photo-bleaching Chlorophyll Processes works due to the pigments in leaves (Chlorophyll-a) and flowers and vegetables (Flavonoids) respectively.

Light intensity and time of year as well as the natural differences in the concentration of these pigments between species and specimens will have an effect on the results.

Place the leaf and transparency in a frame and then out into the sun.

I found at first just a slight color change of the leaves before them drying out and dying. Test different leaves. Patience.

High light intensity and low atmospheric humidity cause the leaf to dry much faster and consequently, the mid-tones are less or not at all visible.

So it’s important to control the exposure.

f you want to keep the leaf from drying out and dying you’ll need to provide water. You can position the leaf so that the stem hangs out. This will allow you to secure a small bag of water to the stem.

The process can take anywhere from 24hrs – weeks

Preservation of the leaves

The first step is to immerse our leaf for 20 minutes in alcohol to facilitate the penetration of the copper sulfate into the chlorophyll’s magnesium molecule.

Second step. Copper sulphate bath

This would be the equivalent to the “stop bath” in analogue photography.

I use a proportion of 15% copper sulphate in distilled water and I immerse the leaf for five minutes.

Third step. Immerse the leaf for 10 – 15 minutes in running water

Fourth step. Drying. Put it between two sheets of thick cardboard with a lot of weight on them so that the leaf stay flat

Fifth Step. Waxing the leaf. I have not found the optimal wax yet.

https://binhdanh.com/Projects/Immortality/Immortality.html

in the last weeks to friends of mine did the switch to linux.

I promised to list the programs/extensions I use on my ubuntu laptop.

Here they are, in no specific order.

I switched to Kubuntu on the Dell laptop. 
The gnome desktop is not flexible enough for me.

KDE is nice, there is just one glitch I do not understand:
Only in Kubuntu installing .deb packages with apt or doubleklick I got frequently a "Not resolved dependencies" error.
I was in despair, but then I read this error is a fake, 
I should use dpkg -i to install.
And... that did it. Why???

And another problem I did not see in Ubuntu:
The NAS smb was shown in Nautilus, but not in Dolphin...



My Ubuntu and / (a few of them) Kubuntu mods:

gnome extensions

applications menue extension
alphabetical app grid extension
(jiggle)


espanso / autokey
midnight commander  (mc)
nmap
Gaucho

super tux cart ;-)

Terminator
btop
iftop

Gnome gmail
Gnome Sushi

dock to panel
Tiling Assistant

Okular  Dokumentenviewer / Kate
XN View

shotcut
darktable
openscad

freetuxtv

network stats  extension
(executor extension)
(ettercap)
(etherape)
stacer

google earth view wallpaper

Google earth 
get -O google-earth64.deb http://dl.google.com/dl/earth/client/current/google-earth-stable_current_amd64.deb
 
sudo dpkg -i google-earth64.deb
 
sudo apt-get -f install; rm google-earth64.deb


nvidea  ubuntu-drivers autoinstall


Fingerprint reader Dell laptop:

echo "
deb http://dell.archive.canonical.com/updates/ focal-dell public
deb http://dell.archive.canonical.com/updates/ focal-oem public
deb http://dell.archive.canonical.com/updates/ focal-somerville public
deb http://dell.archive.canonical.com/updates/ focal-somerville-melisa public" | \
sudo tee -a /etc/apt/sources.list.d/focal-dell.list

# Add the Dmacbook airell repository key (F9FDA6BED73CDC22) to apt
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F9FDA6BED73CDC22
sudo apt update

# Install fingerprint reader packages
sudo apt install -y \
    oem-somerville-melisa-meta \
    oem-somerville-meta \
    libfprint-2-tod1-goodix \
    tlp-config

reboot, dann User, Authent… und Fingerprint




Macbook Air 

I tried Fedora:
Bad WiFi and difficult to install propietory drivers.

I tried Arch and Manjero:
Very flaky and slow WiFi with all tested drivers.

I tried Parrot OS:

Nice, but the touchpad was difficult to use, jumpy, and the fonts not so readable..

I tried Linux Mint:

Splendid WiFi but no smt devices detected, Network detection crashed. Reinstall...the same problem. No one could help me in the groups, even the specialist google had no solutions. 

Pop OS:

Worse. Programs got stuck alarmingly often, bad wifi and crashes of fontmanager every time..

I tried Ubuntu:
Everything worked out of the box. Bravo!

I switched to Kubuntu:
Everything working! Great. (Just the same apt dependencies error as described above)


BTW, I had to install the german gui for Libreoffice by myself, it defaulted to English.

sudo apt install libreoffice-help-de
sudo apt install libreoffice-l10n-de

Than I had to set the screen manually to 1600x900, using an entry in ~\.profiles.

xrandr
It outputs current screen resolution as well as all available solutions. All I needed here is the display device name, in my case, it’s eDP-1. 

cvt 1600 900

Replace 1600 900 (1600X900 in my case) in the command to your desired screen resolution.

Copy the Modeline, and run command to add new mode:

sudo xrandr --newmode "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync

Now add the new created mode for your display device:

sudo xrandr --addmode eDP-1 "1600x900_60.00"

Finally Apply the new resolution in the Display settings 


To make Ubuntu remember the new created screen resolution at next start, you have to edit the .profile via command:

sudo nano) ~/.profile

And insert at the end:

xrandr --newmode "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync
xrandr --addmode eDP-1 "1600x900_60.00"



...more to come as the journey goes on...