Physik


Q&A: Seth Lloyd

A pioneer of quantum computing believes the universe is a quantum computer.

A Digital Perspective and the Quest for Substrate-Universal BehaviorsTommaso Toffoli Electrical and Computer Engineering, Boston University, Boston, MassachusettsAbstract Should the Digital Perspective essays collected in these proceedings be viewed more seriously than attempts to play ldquofundamental theoryrdquo—which even in the hands of an Eddington was hard to tell from mythology and numerology?We argue that a nonfrivolous aspect of this Digital Perspective is its heuristic capacity: to help us guess which aspects of our understanding of nature are more ldquouniversal,rdquo more robust, more likely to survive theoretical and experimental challenges. Behaviors that are substrate-independent—that can, for instance, thrive well on a digital support, even though they are traditionally imagined as taking place in a continuum—are especially promising candidates.digital models of physics – inference – machinery of nature

SpringerLink – Article

Feynman Checkerboard as a Model of Discrete Space-Time

Feynman Checkerboard as a Model of Discrete Space-Time

Quantum mechanics explained

The physical motivation for the mathematical formalism of quantum mechanics is made clear and compelling by starting from an obvious fact – essentially, the stability of matter – and inquiring into its preconditions: what does it take to make this fact possible?

Blogged with Flock

Listen to podcasts in half the time

There are ways to save your time on listening to podcast – either not listen to it at all, or make it play faster – Nev shares his tips on saving time on listening to podcast, by increasing the playback speed on Windows Media Player:

“So, how do you listen to podcasts faster?”

The answer: use software that can alter the speed of playback, along with pitch correction. The cool thing about pitch correction is that it enables you to speed up audio without everyone sounding like chipmunks on helium.

I’ve tried a bunch of things (detailed below) and the best software I’ve found for doing this so far is Windows Media Player. Since version 9, WMP has contained an option called “Play Speed Settings“. Go to the View menu, Enhancements submenu and select Play Speed Settings. You’ll now see a slider that can alter the playback speed. Simply slide it around to change the speed on the fly.

At first, and depending on the people speaking, you may only be able to handle a 1.4x speedup. Try that and then, as you listen, gradually ramp up the speed. In no time you should find listening at 2x is quite easily understandable! It only took me one 30 minute podcast to ramp up to this doubling in speed and find it comfortable.

Also iPod has similar option for audiobook in the option menu. You probably need to get used to the speed. Though after a while your ear and brain should get used to the brain and find it digestible and comfortable.

Listen to podcasts in half the time – [Nev’s blog]

Im Web steckt ein enormes Potential an Kreativität und Kommunikation. Wenn Sie mit einer eigenen Website dieses Potential nutzen möchten, helfen Ihnen diese Tutorials weiter.

Ein thematischer Schwerpunkt sind Cascading Style Sheets, mit denen sich visuell anspruchsvolle Sites verwirklichen lassen, die gleichzeitig leicht zu warten sind. Viele reizvolle Effekte lassen sich schon mit wenig Aufwand und einem bisschen Know-How verwirklichen.

Textism

Find this useful?

Textile

A Humane Web Text Generator

what does it do?

Quick block modifiers:
Header: hn.
Blockquote: bq.
Footnote: fnn.
Numeric list: #
Bulleted list: *

Quick phrase modifiers:
_emphasis_
*strong*
??citation??
-deleted text-
+inserted text+
^superscript^
~subscript~
%span%

To apply attributes:
(class)
(#id)
{style}
[language]

To align blocks:
< right
> left
= center
<> justify

To insert a table:
|a|table|row|
|a|table|row|

To insert a link:
„linktext“:url

To insert an image:
!imageurl!

To define an acronym:
ABC(Always Be Closing)

To reference a footnote:
[n]

Load sample input text



–>

The Digital Music Weblog

Card Squad

The Unofficial Apple Weblog (TUAW)

TV Squad

Luxist

PVR Wire

Gadling

Autoblog

Download Squad

HD Beat

All contents copyright © 2005, Engadget, LLC. All rights reserved.
Engadget is a member of the Weblogs, Inc. Network. Privacy Policy

Bridge Blog Index

From Global Voices

(Redirected from BridgeBlog)
Table of contents
//
[showhide]

What are BridgeBlogs?

Hossein Derakhshan (aka. Hoder) proposed three models for ways people can use weblogs to communicate between cultures: windows, bridges and cafés. Windows allow us to look into another culture, but not interact – an example might be a weblog of someone in another country, talking about her daily life to her friends and family. We’ve got a chance to look in, but we’re not invited to interact.

Cafés are complex spaces where groups of people can meet to discuss in ways that they can’t meet in the real world, due to geography, politics or language. Joi Ito’s IRC channel (http://joiwiki.ito.com/joiwiki/index.cgi?ircchannel) is a good example of a café.

Bridges are more interactive than windows, but less complex than cafés. They’re usually the project of a single blogger, or a small group of authors. Bridge bloggers write for an audience outside their everyday reality – for instance, when Ory Okolloh (http://blogs.law.harvard.edu/ory) writes about corruption in Kenya, reaching family at home and readers at Harvard, she is bridge blogging. (And when people comment on her blog from outside Kenya, they’re bridging back.

Some other great examples of bridge blogs:

Editor, Myself (http://www.hoder.com/weblog/) – Hossein Derakshan’s English-language blog

Where is Raed? (http://dear_raed.blogspot.com/) – Salam Pax’s blog from Baghdad, now on indefinite hiatus. One of the original and most widely known bridgeblogs.

Black Looks (http://okrasoup.typepad.com) – Sokari Ekine’s blog on African Women’s issues

Screenshots (http://www.jeffooi.com/) – Jeff’s Ooi’s blog on Malaysian politics

We’re interested in creating an index of these types of online spaces, with a special emphasis on bridge spaces. This index, as it grows will be a resource for people who want to understand what’s going on in different parts of the world from a personal perspective, as well as a journalistic or encyclopedic perspective. We hope this will be a resource for the mainstream media as they look for local voices to expand coverage in parts of the world they routinely fail to cover, as well as for individuals.

including IRC chans, Usenet lists, Yahoo groups, etc?

yes, if they meet other aspects of the definition. It’s easiest for us to track blogs and wikis because of RSS, but we’re very open to the notion that lots of this content is posted in other kinds of spaces… EthanZ 16:20, 6 Jun 2005 (EDT)

How do we maintain this index?

Well, that’s a work in progress.

Here’s a methodology that EthanZ, Sj, RMack (http://rconversation.blogs.com/) and Joho (http://www.hyperorg.com/blogger) converged on in a recent discussion at Berkman (http://cyber.law.harvard.edu/home/) to start indexing individual bits of bridge-content:

Individuals agree to watch a country or an issue. This includes watching Technorati (http://www.technorati.com), Flickr (http://www.flickr.com) and del.icio.us tags, as well as any prominent weblogs already identified as being from/about that country.

When a watcher finds a photo, post or article focused on that country, s/he uses del.icio.us to tag it, using the country name as a tag – i.e., if Ethan finds a blogpost about a new tech company in Accra, he tags it „ghana“. If he finds a blog that consistently writes about Ghana, he tags it „gv-ghana“, a special tag which means that a Global Voices watcher has identified a likely bridgeblogger.

Watchers maintain wiki pages within the Global Voices wiki which list identified bridgebloggers and the sources being watched. These pages invite other people to join in watching a country, or take on watching another country or issue.

As many watchers start using the gv-noun tags, it may become neccesary to aggregate a subset of trusted watchers – that’s a script we can write if the need arises.

Global Index

We are trying to create a global index of bridge content. For examples of what people are trying to do with these index pages, see Ghana, Antarctica or Morocco.

Feel like watching a nation? Please add your name next to the country in the list below, and add the page itself to your watchlist (follow the „Watch this page“ link once you’re looking at the page itself). Then watch the feeds listed on the page for new bridge sources, and add them to the page when you find them… or add your own favorite feeds to the list.

Template: If you need assistance on how to add information to each page, please take a look at Nepal page. You can use the structure of that page as a template.

(Countries are from Wikipedia’s List of Countries by Continent (http://en.wikipedia.org/wiki/List_of_countries_by_continent) – decisions on what is a country and what continent it belongs to (controversial topics) are made by the Wikipedia authors.

#Africa | #Antarctica | #Asia | #Europe | #North and Central America | #Oceania | #South America

Africa

Antarctica

Asia

Middle East

Europe

North and Central America

Oceania

South America

aus : http://derstandard.at/?url=/?id=2271491

Google hat eine Sorge – die Stromkosten
Ingenieur warnt Unternehmen vor einem Unterschätzen dieses Kostenfaktors

Trennlinie
In einem Artikel in der Zeitschrift ACM (Association for Computing Machinery) Queue warnt Google-Ingenieur Luiz André Barroso Unternehmen vor den oftmals unterschätzten Stromkosten von Servern.

350 Euro pro Gerät

Einstiegsmodell mit rund 200 Watt, zu Spitzenzeiten auch mit einem Verbrauch von 300 Watt, kostet bei einem 24-Stunden-Betrieb und mit 20 Cent pro Kilowattstunde mindestens 350 Euro im Jahr.

Rechner und die Xbox360

Guter Desktop-PCs und aktuelle Spielekonsolen – wie etwa Microsofts Xbox360 würden rund die Hälfte dieses Wertes erreichen. Da bei Google tausende Rechner und Server inBetrieb seien und neben den Stromkosten auch Zusatzaufwendungen etwa für die Klimatisierung der Rechenzentren kommen, ist dies eine große Kostenstelle – die auch der anderen Seite aber auch noch viel Einsparungspotenzial bietet, wie Barroso meint.

Einsparung

Wenn sich die Stromtarife nicht erheblich ändern würden, so haben Unternehmen für die Stromkosten wesentlich mehr zu zahlen, als die Hardware kostet. Eine Möglichkeit die Kosten zu senken sieht der Ingenieur im Einsatz von Server-Prozessoren mit mehreren Kernen. So habe AMD für seinen Doppelkern-Opteron 275 eine 80-prozentige Performance-Steigerung gegenüber seinem Einfachkern-Opteron 248 angegeben. Die Leistungsaufnahme steige jedoch nur um sieben Prozent und bei „pessimistischer Einschätzung“ dass auch der Rest des Systems sieben Prozent mehr Strom fordert, würde sich daraus eine Verbesserung um knapp 70 Prozent ergeben. Barrosos Untersuchung und die Entwicklungen einiger Server-Hersteller, etwa von Sun, lassen erkennen, dass diese Thematik immer wichtige werden wird. Der so genannte ökologisch verantwortliche Rechner-Einsatz – mittlerwiele als Eco Computing bekannt – dürfte in den nächsten Jahren wesentliche Bedeutung erfahren.(red)

Nächste Seite »