Tuesday, December 19, 2017

Silikonreste/Silikonklebereste im Aquarium entfernen

Dies ist ein Tip, um Silikonreste von ehemals verklebten Innenfiltern und Strukturwänden sauber und rückstandslos zu entfernen. Die fragliche Stelle muss trocken sein, also mindestens über der Wasseroberfläche liegen.

Zunächst nehme ich einen Ceranfeld- oder Glasschaber. Im Prinzip ist dies nicht anderes als ein Gerät, mit einer scharfen Rasierklinge im Kopf. Mit dem Schaber wird zunächst das Silikon soweit wie möglich vorsichtig abgetragen. Bei korrekter Anwendung ist das für das Glas selbst auch ungefährlich. In der Regel verbleibt danach nur noch eine sehr dünne Schicht Silikon auf dem Glas. Um diese nun ebenfalls zu entfernen, trage ich vorsichtig mit einem Pinsel Silikonentferner (fertiges Lösemittelgemisch aus dem Baumarkt) auf die fragliche Stelle auf und lasse es einwirken. Hierbei sollte man grundsätzlich sehr vorsichtig sein, da ja alle Verklebungen am Aquarium aus Silikon sind. Nach der vorgeschriebenen Einwirkzeit kann nun auch die dünne Silikonschicht mit dem Schaber recht einfach entfernt werden. Evtl. ist an wenigen Stellen die Behandlung zu wiederholen. Die Stelle kann und sollte im Anschluss mit Aceton o. ä. vorsichtig gereinigt werden, um die Resten des Silikonentferners ebenfalls zu entfernen. Wer möchte, wischt feucht nach. Das Glas ist danach rückstandsfrei sauber.

Das Ganze funktioniert im Übrigen auch auf dem Innenfilter selbst. Allerdings sind hier bei der mechanischen Bearbeitung mit dem Schaber Kratzer möglich!

Monday, December 18, 2017

Lesson learned today

If you connect your Canon EOS digital camera via USB to your computer and nothing happens, this might bue de to the WIFI/WLAN function being enabled on your camera. I forgot, that enabling WIFI turns off USB and HDMI.

Friday, December 8, 2017

Sub-menus with Bloggers Simple Template (Part 1)

In this post I'm going to explain, how I added a sub-menu to my blogs page list. It is a common question, how to do this. And there are some solutions out there. But I decided to do a few things differently this might be interesting for others too.

Lets first take a look at the existing widget code. For some reason, the Pagelist widget only allows a list with one level of entries. It has already been asked, if there is a way to adjust the widget code, which looks like this:

        <b:widget id='PageList1' locked='false' title='Pages' type='PageList'>
            <b:widget-setting name='pageListJson'><![CDATA[{'home': {'href': '', 'title': 'Home', 'position': 0}, '4785025671937868325': {'href': '', 'title': 'Aquarien', 'position': 1}, '3693528163117485839': {'href': '', 'title': 'Hardware (Debian)', 'position': 2}}]]></b:widget-setting>
            <b:widget-setting name='homeTitle'>Home</b:widget-setting>
          <b:includable id='main'>
  <b:if cond='data:title != ""'><h2><data:title/></h2></b:if>
  <div class='widget-content'>
    <b:if cond='data:mobile'>
      <select expr:id='data:widget.instanceId + "_select"'>
        <b:loop values='data:links' var='link'>
          <option expr:value='data:link.href'>
            <b:attr cond='data:link.isCurrentPage' name='selected' value='selected'/>
      <span class='pagelist-arrow'>&#9660;</span>
        <b:loop values='data:links' var='link'>
            <b:class cond='data:link.isCurrentPage' name='selected'/>
            <a expr:href='data:link.href'><data:link.title/></a>

I'll try to explain the code (to my understanding). The variable pageListJson contains the page list as a structure of instanceIDs linked to hashes with key-value-pairs for each page. The value to the key href contains the URL of the page and title the chosen title. The variable is filled by whatever changes you make to the Pagelist widget. The data in this structure is later accessed by values named data:*. There is another variable called homeTitle, which is how you titled your homepage (e.g. Home or Startseite or similar - you configured this in the Pagelist widget). After this, there is the main widget code that creates the resulting HTML web code. If you gave your widget a title, it will be output as <h2> header. And depending, if the code is created for a mobile target or not, the list items are put in a form (mobile device):

<div class='widget PageList' data-version='1' id='PageList1'>
<div class='widget-content'>
<select id='PageList1_select'>
<option selected='selected' value=''>Home</option>
<option value=''>Aquarien</option>
<option value=''>Hardware (Debian)</option>

or a list (website):

<div class='widget PageList' data-version='1' id='PageList1'>
<div class='widget-content'>
<li class='selected'>
<a href=''>Home</a>
<a href=''>Aquarien</a>
<a href=''>Hardware (Debian)</a>

To answer the original question, if the widget code can be adjusted: no solution has been offered yet and I also cannot think of any way to adjust this code to get a submenu properly. There is also the fact, that pageListJson gets its data from the Pagelist widget and the widget won't support any multi-level data structure. The problem could probably easily be fixed by the Google developers I guess, which would also have the advantage of properly supporting this structure in the mobile output (we'll get to that later), but for some reason, the feature has never been added to blogger. So I'm going to make the same approach everybody else does, using an HTML widget and lists. However, my goal was to use the existing CSS code for the Pagelist widget including the usage of the already existing variables for tab colors and stuff. So lets take a look at the existing code first. This is what is already there in the <b:skin>...</b:skin> element holding the CSS and template style stuff (I've shortened the outout to the relevant parts):

Blogger Template Style
Name:     Simple
Designer: Blogger
----------------------------------------------- */

/* Variable definitions

   <Group description="Tabs Text" selector=".tabs-inner .widget li a">
     <Variable name="tabs.font" description="Font" type="font"
         default="normal normal 14px Arial, Tahoma, Helvetica, FreeSans, sans-serif" value="normal normal 14px Arial, Tahoma, Helvetica, FreeSans, sans-serif"/>
     <Variable name="tabs.text.color" description="Text Color" type="color" default="#999999" value="#999999"/>
     <Variable name="tabs.selected.text.color" description="Selected Color" type="color" default="#000000" value="#000000"/>

   <Group description="Tabs Background" selector=".tabs-outer .PageList">
     <Variable name="tabs.background.color" description="Background Color" type="color" default="#f5f5f5" value="#f5f5f5"/>
     <Variable name="tabs.selected.background.color" description="Selected Color" type="color" default="#eeeeee" value="#eeeeee"/>


   <Group description="Accents" selector=".content-inner">
     <Variable name="tabs.border.color" description="Tabs Border Color" type="color" default="$(body.rule.color)" value="#eeeeee"/>


   <Variable name="" description="Tabs Margin Top" type="length" default="0" min="0" max="100px" value="0"/>
   <Variable name="tabs.margin.side" description="Tabs Side Margin" type="length" default="30px" min="0" max="100px" value="30px"/>
   <Variable name="tabs.background.gradient" description="Tabs Background Gradient" type="url"
       default="url(" value="url("/>
   <Variable name="tabs.border.width" description="Tabs Border Width" type="length" default="1px" min="0" max="10px" value="1px"/>
   <Variable name="tabs.bevel.border.width" description="Tabs Bevel Border Width" type="length" default="1px" min="0" max="10px" value="1px"/>


/* Tabs
----------------------------------------------- */
.tabs-inner .section:first-child {
  border-top: $(header.bottom.border.size) solid $(tabs.border.color);

.tabs-inner .section:first-child ul {
  margin-top: -$(header.border.size);
  border-top: $(header.border.size) solid $(tabs.border.color);
  border-left: $(header.border.horizontalsize) solid $(tabs.border.color);
  border-right: $(header.border.horizontalsize) solid $(tabs.border.color);

.tabs-inner .widget ul {
  background: $(tabs.background.color) $(tabs.background.gradient) repeat-x scroll 0 -800px;
  _background-image: none;
  border-bottom: $(tabs.border.width) solid $(tabs.border.color);

  margin-top: $(;
  margin-left: -$(tabs.margin.side);
  margin-right: -$(tabs.margin.side);

.tabs-inner .widget li a {
  display: inline-block;

  padding: .6em 1em;

  font: $(tabs.font);
  color: $(tabs.text.color);

  border-$startSide: $(tabs.border.width) solid $(content.background.color);
  border-$endSide: $(tabs.bevel.border.width) solid $(tabs.border.color);

.tabs-inner .widget li:first-child a {
  border-$startSide: none;

.tabs-inner .widget li.selected a, .tabs-inner .widget li a:hover {
  color: $(tabs.selected.text.color);
  background-color: $(tabs.selected.background.color);
  text-decoration: none;



So there are some already defined variables in the simple blogger template, e.g. tabs.background.color to define the tab background color or tabs.text.color for the tab text color. As you can see, the widget uses the variable values then in the template CSS. And in the resulting website the variables will be replaced by their values.

Ok, so that's where we are. I don't want to re-invent the wheel, so I'm going to make use of these existing variables and code. But I'll have to adjust it to support nested lists. More in another post. Stay tuned...

Tuesday, October 31, 2017


I have no idea, what these errors mean. $searchengine and manual pages didn't reveal anything.

That's the first one. It occurs during boot time. Might be a bug somewhere, recently introduced in Debian Sid.

kernel: [ ... ] cgroup: cgroup2: unknown option "nsdelegate"

And that's the second one. It simply occurred. No real issue with NFS though.

kernel: [ ... ] nfs: RPC call returned error 22
kernel: [ ... ] NFS: state manager: check lease failed on NFSv4 server XXX.XXX.XXX.XXX with error 5

Any explanation is appreciated.

Tuesday, September 26, 2017

Waldfunde - Buchen-Streckfuß

Raupe des Buchen-Streckfuß Raupe des Buchen-Streckfuß
Buchen-Streckfuß / Buchenrotfuß / Rotfuß / Calliteara pudibunda
Dresdner Heide, Dresden, Deutschland
September 2017

Sunday, September 10, 2017


HexeneiZwei Hexeneier mit sichtbarer GlibaStinkmorchel (Phallus impudicus)
Hexeneier der Stinkmorchel / Phallus impudicus
Dresdner Heide, Dresden, Deutschland

Friday, September 8, 2017



Danke an Walter Schön für die Hilfe bei der Bestimmung.