SACO INVEST: 19/09/2010

sábado, 25 de setembro de 2010

Visual 6502

Visual 6502 is a javascript simulation of the venerable 6502 processor, that can run in your web browser. Impressive! [via boingboing]

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Ratings: The Big Bang Theory Explodes on Its New Night

Ratings: The Big Bang Theory Explodes on Its New Night: "

The Big Bang Theory emerged victorious from the first hotly contested Thursday night of the fall TV season, leading CBS to a ratings win, according to overnight Nielsen estimates.

Big Bang, in its Thursday debut, drew 14 million viewers and improved over its Monday season premiere a year ago among the adults-18-to-49 demographic. The strong start also lifted...

The Big Bang Theory Geeks Out for Eliza Dushku

The Big Bang Theory Geeks Out for Eliza Dushku: "

The Big Bang Theory is calling in yet another sexy sci-fi guest star.

Eliza Dushku will guest-star in an episode of the geektastic CBS comedy, a studio rep tells TVGuide.com. The 29-year-old actress, best known for her starring roles in Dollhouse and Buffy the Vampire Slayer, is slated to appear in Episode 7 as ...

Time-Warping Occurs in Daily Life

Time-Warping Occurs in Daily Life: "

Exploring the peculiar effects of Einstein’s relativity is no longer rocket science. Tabletop experiments at a lab in Colorado have illustrated the odd behavior of time, a strangeness typically probed with space travel and jet planes.

Using superprecise atomic clocks, scientists have witnessed time dilation — the bizarre speeding up or slowing down of time described by Einstein’s theories of relativity. The experiments are presented in the Sept. 24 Science.

“Modern technology has gotten so precise you can see these exotic effects in the range of your living room,” says physicist Clifford Will of Washington University in St. Louis. The experiments don’t reveal any new physics, Will says, but “what makes it cute and pretty cool is they have done it on a tabletop.”

Time dilation arises in two situations. In one case, time appears to move slower the closer you are to a massive object, such as the Earth. So a person hovering in a hot-air balloon, for example, actually ages faster than someone standing below.

Time also ticks by faster for someone at rest relative to someone moving. Einstein dramatized this second strangeness with the twin paradox — one 25-year-old twin traveling in a rocket ship near the speed of light for what he perceives as a few months will return to Earth to find the other has reached middle age.

Previous experiments with rockets and airplanes have demonstrated these odd aspects of general and special relativity. The notion of time running slower closer to Earth was even tested on the scale of a multistory physics building at Harvard.

Now advances in laser technology and the field of quantum information science have allowed researchers to demonstrate Einstein’s theories at much more ordinary scales.

The researchers used two optical atomic clocks sitting atop steel tables in neighboring labs at the National Institute of Standards and Technology in Boulder, Colorado. Each clock has an electrically charged aluminum atom, or ion, that vibrates between two energy levels more than a million billion times per second. A 75-meter-long optical cable connects the clocks, which allows the team to compare the instruments’ timekeeping.

In the first experiment, physicist James Chin-wen Chou and his colleagues at NIST used a hydraulic jack to raise one of the tables 33 centimeters, or about a foot. Sure enough, the lower clock ran slower than the elevated one — at the rate of a 90-billionth of a second in 79 years. In a second experiment the team applied an electric field to one clock, sending the aluminum ion moving back and forth. As predicted, the moving clock ran slower than the clock that was at rest.

“It’s pretty breathtaking precision,” says physicist Daniel Kleppner of MIT. Of course scientists are well aware of these relativistic effects, he notes. The clocks on GPS devices are also affected by relativity, and appropriate adjustments are made to keep them working properly.

The experiments have more implications for precision instrumentation than they do for relativity, notes Chou. But they are a nice reminder that relativity is always at hand. “People tend to just ignore relativistic effects, but relativistic effects are everywhere,” he says. “Every day, people are moving; they are doing things like climbing stairs. It’s interesting to think about — are frequent flyers getting younger [because they move so much] or aging faster [because they spend so much time in the air]?”

Image: AAAS/Science

See Also:

Photos Surface of the Day Einstein Died

How Black Holes Overcome Centrifugal Force to Suck in Gas

Physicists Tame Time Travel by Forbidding You to Kill Your …

What Is Time? One Physicist Hunts for the Ultimate Theory

Time Machine To Be Created Underground? Probably Not

New “Harry Potter and the Deathly Hallows” Trailer Hits the Web [VIDEO]

New “Harry Potter and the Deathly Hallows” Trailer Hits the Web [VIDEO]: "

The new cinematic trailer for the upcoming Harry Potter and the Deathly Hallows movie has appeared on YouTube.

This is the highly anticipated first part of the epic finale that brings closure to the adventures of the little (O.K., perhaps not so little any more) wizard.

Check out the new trailer above. If you missed the first trailer for the movie, you can find it here.

Reviews: YouTube, harry potter

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YouTube Time Machine helps you reminisce with YouTube videos from a certain year

YouTube Time Machine helps you reminisce with YouTube videos from a certain year: "

Filed under: Video, web 2.0

YTTM apparently stands for 'YouTube Time Machine,' although that's not specifically mentioned on the site. What it does is very easy to understand, though. You move a slider to a specific year between 1860 and 2010, and you get a bunch of YouTube videos related to that year. Yes, I said 1860 (that's not a typo).

Not all hits are spot-on, though. When I chose 1972, I got a video from 1970. So, I guess you could say YMMV with YTTM (sorry, couldn't help myself there). But for the most part, the hits are relevant. I think it just takes the year from the video's name on YouTube.

You can narrow your search down by categories, such as Video Games, Television, Commercials, Current Events, Sports, Movies, and Music. I'm afraid there are not many video game related videos from the 19th century, though.

One detail which annoyed me was that toggling a filter reloads the entire page. It's as if AJAX was never invented - you click a button, and suddenly the whole page blinks out and reloads. I hope they get that fixed.

Notwithstanding this one quirk, YTTM is a nice way to travel through time. Just dial in a year, and watch the videos. When you've had enough of a certain clip, you can just click Watch next video and be transported to the next one - no searching involved.

YouTube Time Machine helps you reminisce with YouTube videos from a certain year originally appeared on Download Squad on Thu, 23 Sep 2010 15:30:00 EST. Please see our terms for use of feeds.

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sexta-feira, 24 de setembro de 2010

How to Find Almost Anything on your Computer with Windows Search

How to Find Almost Anything on your Computer with Windows Search: "

windows search The built-in desktop search tool is one of my favorite features of Windows. Unlike Google Instant, Windows Desktop Search cannot predict queries in advance but it can find you relevant documents, e-mails, programs and other files almost as fast as you can type characters in the search box.

Windows search can be accessed from a variety of places on your computer. This includes the Windows Start Menu, Windows Explorer or press the “Windows key + F” to open a standalone search window. The latter option is more useful as it offers hints as you type and thus you can easily construct complex search queries without knowing the exact syntax.

Use Windows Desktop Search like a Pro

Windows Search supports simple operators to help you narrow down search results and find the exact file or email message that you’re looking for. Some real-world examples:

1. Find presentations (ppt files) that contain a particular word.

ext:ppt sales {Search for the word “sales” in file names as well the content of documents}

ext:ppt filename:sales {Search only file names, don’t look inside the file content}

2. Find documents that were created or modified this week.

ext:doc date:this week {replace doc with xls, ppt, etc. for other file types}

In addition to “this week”, you may use values like today, yesterday, last week, past month or even “a long ago” with the date: search operator. It also works with date ranges as in the following examples.

date:13-‎09-‎2010..‎24-‎09-‎2010 {find files added /modified in this date range}

kind:pictures date:>23-09-2010 {find all photographs that were captured after this day}

3. Find files that are taking lot of space on your system.

The following search query will instantly find gigantic video files that are larger than 128 MB in size. If you replace the value “gigantic” with “empty”, you’ll see all the files are 0 KB in size.

size:gigantic kind:video {find large video files like mp4, mov, wmv, avi, etc.}

size:>500MB {all files that are larger than .5 GB}

size:500MB..800Mb {find files that are in this particular size range}

4. Find files within a specific folder.

Windows Desktop Search, by default, will find files across all folders that have been added to the search index. If your search results are cluttered due to this, you can quickly narrow them down to select folders as in the following examples:

todo folder:documents {search your My Documents folders}

folder:desktop ext:pdf date:today {find PDF documents that you saved today}

adobe setup.ini folder:c:\program files {search a file in Adobe’s installation folders}

5. Find Emails with Windows Search

Other than documents and files, Windows Search is an excellent tool for searching your Outlook emails and it works more or less like search commands in Gmail. Some examples:

from:aryaman date:this week {find emails from Aryaman that you received this week}

isread:false importance:high {find all your important but still unread emails}

hasattachment:true size:>5mb {find emails with bulky attachments}

subject:”credit card” from:bank.com {find all Credit Card related emails from the bank}

These are just a few useful examples but you should also check out MSDN for a complete list of advanced search operators that are supported by Windows Desktop Search.

Also, if you have trouble getting your files or your emails in the search results, chances are that you have not added the locations to your Windows Search Index. Go to Control Panel –> Indexing Options and modify your Indexed Locations.