www.loltestab.fora.pl
Just a simple test
FAQ
Search
Memberlist
Usergroups
Galleries
Register
Profile
Log in to check your private messages
Log in
www.loltestab.fora.pl Forum Index
->
Forum testowe
Post a reply
Username
Subject
Message body
Emoticons
View more Emoticons
Font colour:
Default
Dark Red
Red
Orange
Brown
Yellow
Green
Olive
Cyan
Blue
Dark Blue
Indigo
Violet
White
Black
Font size:
Tiny
Small
Normal
Large
Huge
Close Tags
Options
HTML is
OFF
BBCode
is
ON
Smilies are
ON
Disable BBCode in this post
Disable Smilies in this post
Confirmation code: *
All times are GMT + 2 Hours
Jump to:
Select a forum
Jakaś kategoria
----------------
Forum testowe
Topic review
<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>cheapbag214s</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/subSilver/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Mon 23:46, 02 Dec 2013<span class="gen"> </span> Post subject: for the last 50 years</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Stone tools made of volcanic obsidian reveal source to new instrument <br />SHEFFIELD, England, Sept. 11 () -- Stone tools made of obsidian found at archaeological digs can be traced to their geological source in seconds with a new instrument, British researchers say.Obsidian, naturally occurring volcanic glass, is hard and sharp when fractured, making it a highly desirable raw material for crafting stone tools for almost all of human history, they said.Some obsidian tools found in East Africa are nearly 2 million years old,[url=http://www.panyam.com/]gucci outlet store[/url], they said.The chemistry of obsidian varies from volcano to volcano and represents a "fingerprint" allowing researchers to match an obsidian artifact to the volcanic origin of its raw material, but such tests previously required sophisticated equipment in laboratories and often had to wait for months or even years after an archaeological site had been excavated.Researchers at the University of Sheffield report they've created a hand-held instrument using an analytical technique called portable X-ray fluorescence that enables archaeologists to identify the origins of stone tools in the field rather than having to send them off to a distant lab."Obsidian sourcing has, for the last 50 years, involved chemical analysis in a distant laboratory,[url=http://www.arch-eyes.com/]Christian Louboutin Outlet[/url], often taking 5 minutes per artifact, completely separate from the process of archaeological excavation," Sheffield archaeologist Ellery Frahm said."We can now analyze an obsidian artifact in the field, and just 10 seconds later, we have an answer for its origin," he said.</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="http://picsrv.fora.pl/subSilver/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
fora.pl
- załóż własne forum dyskusyjne za darmo
Powered by
phpBB
© 2001, 2005 phpBB Group
Regulamin
FAQ
Search
Memberlist
Usergroups
Galleries
Register
Log in to check your private messages
Log in