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Peter Ernst (WetHat)
Works at in - integrierte informationsysteme GmbH
Attended Ludwig Maximilian University of Munich
Lives in Sindelfingen
2,582 followers|65,226 views
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Here is a quick check if your favorite server is actually affected by the #heartbleed  disaster. +Mashable has put together an excellent article about this bug (http://mashable.com/2014/04/09/heartbleed-bug-websites-affected/) providing details about popular services which might have been affected.
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This is an excellent checking site too +Laura Smith. Thanks for sharing it! I like the advice this site gives you after checking. Hope you weren't affected by #heartbleed . I need to change a number of passwords, I'm afraid
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Peter Ernst

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Highly advanced Coast to Coast custom with features that include a Corvette 350cid LS1 engine, 4L60E automatic transmission, Ford 9" rear end, Wilwood 4-wheel power disc brakes, rack & pinion power steering, air conditioning, digital dash gauges, custom sound system, power windows, doors and trunk, Budnik steering wheel, chrome tilt column, full custom leather interior and trunk, removable custom hardtop, polished custom exhaust, 17" and 18" Billet Specialties wheels, custom Tangerine and Candy Red exterior finish. Fascinating quality and craftsmanship throughout.
-> http://www.barrett-jackson.com/application/onlinesubmission/lotdetails.aspx?ln=719&aid=304
 
1939 Ford Custom Cabriolet
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If you are thinking of getting one of these color printers, make sure you have enough space. This printer is big (1400 (w) x 1260 (h) x 1100 (d) mm) and heavy (430 kg).  Also I expect this beauty to be a bit pricey for hobbyists.

Care for more the specs? Look here: http://www.stratasys.com/3d-printers/design-series/precision/objet500-connex3

#3dprinting   #3dprinter
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Peter Ernst

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"The Lonely Tree" - Robert Brown Photography #tree #clouds #sunlight
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Free to use tagging add-in for OneNote 2013

Pretty frequently I found myself wasting time to hunt for notes I filed in the wrong spot in OneNote. My notebook is hugh, so it typically takes a number of searches until I find my stuff. Since finetuning searches is not exactly my hobby, I've created a OneNote add-in to use tags (hashtags without the hash ;-) to filter (disambiguate) search results.

This add-in uses the built-in OneNote tagging System to take tagging of notes to the next level. Currently only OneNote 2013 32-bi is supported. If there is enough demand, support for more versions will be added over time.  

Feature Summary

~ Page Tags can be added/removed from a page _on-the fly_
~ Page tags are available and fully operational for all users of shared OneNote notebooks (requires add-in to be installed on OneNote desktop clients)
~ Search refinement using page tags (facetted search)
~ Full compatibility with built-in OneNote tagging system, even if add-in is not installed.

#onenote   #microsoftoffice   #plugin  
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I see it now. Thank you.
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Have him in circles
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Peter Ernst

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Between a rock and a hard place

This picture by Feliciano Guimarães shows the Casa do Penedo (Stone House) in the Fafe Mountains in northern Portugal. It was built in 1974 from four boulders found on the site.

The house has no electricity so the homeowners use candlelight to see indoors. Media interest in the house has attracted the attention of potential burglars and vandals, so the house is now equipped with bullet-proof windows and a steel door.

The photographer's Flickr site (http://www.flickr.com/photos/jsome1/4027035559/) contains some additional links, including the house's coordinates in Google Earth.

(Found via +géraud morel.)
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Peter Ernst

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Who says Math is dry stuff?
 
Indra's Pearls

This picture by David J. Wright illustrates a Fuchsian group, which can be thought of as a discrete group of isometries (symmetries) of the hyperbolic plane. The hyperbolic plane is a kind of negatively curved two-dimensional space in which the angles of a triangle add up to less than 180 degrees. The hyperbolic plane features prominently in the work of the artist M.C. Escher, especially in his Circle Limit series.

The pattern in the picture is symmetric under a group of symmetries generated by two Möbius transformations a(z) and b(z). Each of these sends a complex number z to (cz+d)/(ez+f) for certain complex numbers c, d, e, f. These transformations preserve angles between curves and send circles to circles. As with any group of symmetries, each of the transformations a=a(z) and b=b(z) can be inverted; we will denote the inverse transformations by a^{-1} and b^{-1}.

Each disc in the picture has one of fifteen possible colours. The transformation b sends a disc to another disc of the same colour, whereas the transformation a sends a disc to a disc of the next possible colour, where the colours are ordered in a cyclic rainbow order.

Let us denote the big purple disc on the left of the picture by D. Although the operators a(z) and b(z) do not commute with each other, it can be shown that if we apply the inverse of the transformation a(z) to D and then subsequently apply b(z), then D is sent to the same disc as it would have been if we applied the transformations in the opposite order. Furthermore, if we apply b(z) to D, we obtain the same disc as if we had applied a(z) fifteen times. It can be shown using this observation that the discs in the picture are consistently coloured. [Precise explanation for mathematicians: the stabilizer of D is generated by ab^{-1}a^{-1}b and b^{-1}a^{15}. The colours in the picture give information on the cosets of the stabilizer of D in the group generated by a and b.] 

The 2002 book Indra's Pearls by David Mumford, Caroline Series and David Wright is all about pictures like this one. Here is the book's self-summary:
Felix Klein, a great geometer of the nineteenth century, rediscovered an idea from Hindu mythology in mathematics: the heaven of Indra in which the whole Universe was mirrored in each pearl in a net of pearls. Practically impossible to represent by hand, this idea barely existed outside the imagination, until the 1980s when the authors embarked on the first computer investigation of Klein's vision. In this extraordinary book they explore the path from some basic mathematical ideas to the simple algorithms that create delicate fractal filigrees, most appearing in print for the first time. Step-by-step instructions for writing computer programs allow beginners to generate the images.

Klein, who lived between 1849 and 1925, was aware that these pictures would have looked very striking, but he had no way to produce them. Here's what he had to say about this in 1894:
The question is, what will be the configuration formed by the totality of all the circles, and in particular what will be the position of the limiting points. There is no difficulty in answering these questions by purely logical reasoning; but the imagination seems to fail utterly when we try to form a mental image of the result.

Relevant links
This picture comes from the website http://klein.math.okstate.edu/IndrasPearls/

A more detailed mathematical explanation by David J. Wright may be found here: http://klein.math.okstate.edu/IndrasPearls/DoubleCuspGroup/DoubleCuspGroup/

Indra's Pearls book: http://books.google.com/books/about/Indra_s_Pearls.html?id=kC5kdUirHHoC

A post by me about Escher's picture Circle Limit IV: https://plus.google.com/101584889282878921052/posts/gTKPeH6FBdd

This picture is worth viewing at high resolution.

(Found via +Owen Maresh.)

#mathematics  #scienceeveryday
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Peter Ernst

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Valley View - Shumon Saito Photography www.shumonphotography.com El Capitan, Valley View in Yosemite Valley, CA. #river #snow #landscape
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M# - a New Programming Language

Joe Duffy from the M# team thinks a M#  can be almost as performant as C++ but as easy to use and productive as C#. Unlike C#, which is, according to Joe,  "easy to use, but not very fast", kind of a best of C# and C++. The article actually conveys the idea that M# is rather an extension to C# than a new language. Joe's original post can be found at:  http://joeduffyblog.com/2013/12/27/csharp-for-systems-programming/.

The link below takes you to +I Programmer 's well written summary.
#programming   #cs   #csharp   #programminglanguage   #msharp  
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Free to use tagging add-in for OneNote 2013

Pretty frequently I found myself wasting time to hunt for notes I filed in the wrong spot in OneNote. My notebook is huge, so it typically takes a number of searches until I find my stuff. Since finetuning searches is not exactly my hobby, I've created a OneNote add-in to use tags (hashtags without the hash ;-) to filter (disambiguate) search results.

This add-in uses the built-in OneNote tagging System to take tagging of notes to the next level. Currently only OneNote 2013 32-bi is supported. If there is enough demand, support for more versions will be added over time.  

Feature Summary

~ Page Tags can be added/removed from a page _on-the fly_
~ Page tags are available and fully operational for all users of shared OneNote notebooks (requires add-in to be installed on OneNote desktop clients)
~ Search refinement using page tags (facetted search)
~ Full compatibility with built-in OneNote tagging system, even if add-in is not installed.

#onenote   #microsoftoffice   #plugin  
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People
Have him in circles
2,582 people
Wallace McClure's profile photo
Michael Cierkowski's profile photo
Work
Occupation
Owner & CTO
Skills
PowerShell, SharePoint, .net, SQL Server, VisualStudio, Subversion, Hyper-V, XML, Software Architecture, CAD Kernel Architecture, Coordinating Geographically Dispersed Development Teams
Employment
  • in - integrierte informationsysteme GmbH
    Senior Consultant, 2014 - present
  • Parametric Technology Corporation
    Technical Fellow, 2007 - 2013
  • Hewlett-Packard
    Software Architect, 1986 - 1996
  • CoCreate GmbH
    Productline Architect, 1996 - 2007
  • UBI EDV
    Software Engineer, 1982 - 1986
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Sindelfingen
Previously
Gilching - München (Munich)
Links
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Tagline
SharePoint, .Net, Winbuilder, PowerShell, OneNote
Introduction
I have a passion for software design and development. I do that for a living and sometimes in my spare time too ( see WetHat Lab ). I strongly believe in the merits of beautiful code, design patterns, and brain-on unit testing.
 
I post about these programming topics:
  • Software design patterns, development practises, and programming paradigms
  • Programming languages. Mostly C#, JavaScript, PowerShell
  • Markup languages: HTML, XML, XSLT, XAML
  • APIs and frameworks: .net, Windows Scripting Host, ASP.net
  • Programming Environments: Visual Studio
  • Content Management Systems: SharePoint
  • Virtualization: Hyper-V
Every now and then also I post about Mathematics, Physics or science and technology in general.
 
I appreciate good photographs, so you will find me sharing my own creations or, more likely, the fantastic work of the photographers in my circles
 
Feel free to circle me. 
Bragging rights
I appreciate people who say *no* to me, because they teach me to learn how to do it myself
Education
  • Ludwig Maximilian University of Munich
    Physik
Basic Information
Gender
Male
Relationship
Married
Other names
WetHat
Peter Ernst (WetHat)'s +1's are the things they like, agree with, or want to recommend.
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Mistreated Foxconn Interns Claim To Have Sabotaged The Sony PS4 [Rumor]
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With new iWork, Apple spotted the problem but declined to fix it
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D-Wave Quantum Computing Solution Raises More Questions - Slashdot
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benonemusic writes "The commercially available D-Wave computer has demonstrated its ability to perform increasingly complex tasks. But is it

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Windows RT 8.1 Update Pulled From Windows Store
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Earlier this week Microsoft finally started rolling out Windows 8.1, its much awaited update. Despite various builds being leaked over the l

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Americans can't count, and not so good at tech -- report
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According to a report by the OECD, America comes only above Italy and Spain in math ability. We're below average at technological problem-so