古埃及铁工艺品取材于外太空陨石-凯发k8官网

古埃及铁工艺品取材于外太空陨石
文章来源:未知 文章作者:enread 发布时间:2013-08-20 06:17 字体: [ ] 
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researchers have shown that ancient egyptian iron 1 held at the ucl petrie museum were hammered from pieces of 3(陨石), rather than iron ore. the objects, which trace their origins to outer space, also predate the 4 of iron 5 by two 6. carefully hammered into thin sheets before being rolled into tubes, the nine beads -- which are over 5000 years-old -- were originally strung into a necklace together with other exotic minerals such as gold and gemstones, revealing the high value of this exotic material in ancient times. the study is published in the journal of archaeological science.
 
professor thilo rehren (ucl 7, qatar), lead author of the paper, said: "the shape of the beads was obtained by smithing and rolling, most likely involving multiple cycles of hammering, and not by the traditional stone-working techniques such as 8 or drilling which were used for the other beads found in the same tomb."
 
the team's results show that in the fourth 9 bc metalworkers had already mastered the smithing of 10 iron, an iron-nickel 11 much harder and more 12 than the more commonly worked 13, developing techniques that went on to define the iron age.
 
as a result metalworkers had already nearly two millennia of experience of working with meteoritic iron when iron smelting was introduced in the mid-second millennium bc. this knowledge was essential for the development of iron smelting and the production of iron from iron ore, enabling iron to replace copper and bronze as the main metals used.
 
14 in 1911, in a pre-dynastic 15 near the village of el-gerzeh in lower egypt, the beads were already completely 16 when they were discovered. as a result, the team used x-ray methods to determine whether the beads were actually 17 iron, and not magnetite, which can often be mistaken to be corroded iron due to similar properties.
 
by scanning the beads with beam of 18 and gamma-rays, the team were able to reveal the unique 19 and also high concentration of nickel, cobalt, phosphorus and germanium(锗) -- which is only found in trace amounts in iron 20 from ore -- that is characteristics of meteoric iron, without having to attempt invasive analysis which could potentially damage these rare objects.
 
professor rehren said: "the really exciting outcome of this research is that we were for the first time able to demonstrate 21 that there are typical trace elements such as cobalt and germanium present in these beads, at levels that only occur in meteoritic iron.
 
"we are also excited to be able to see the internal structure of the beads, revealing how they were rolled and hammered into form. this is very different technology from the usual stone 2 drilling, and shows quite an advanced understanding of how the metal smiths worked this rather difficult material."


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1 894701f6859a9d5c3c045fd6f355dbf5     
n.(空心)小珠子( bead的名词复数 );水珠;珠子项链
参考例句:
  • a necklace of wooden beads 一条木珠项链
  • beads of perspiration stood out on his forehead. 他的前额上挂着汗珠。
2 hdbyl     
n.念珠;(pl.)珠子项链;水珠
参考例句:
  • she accidentally swallowed a glass bead.她不小心吞下了一颗玻璃珠。
  • she has a beautiful glass bead and a bracelet in the box.盒子里有一颗美丽的玻璃珠和手镯。
3 12efd1ed528a28fe1f7cb667a7fbc1e0     
n.陨星( meteorite的名词复数 )
参考例句:
  • small meteorites have left impact craters all over the planet's surface. 这个行星的表面布满了小块陨石留下的撞击坑。 来自《简明英汉词典》
  • one theory about the existence of extraterrestrial life rests on the presence of carbon compounds in meteorites. 地球外存在生命的理论是基于陨星上存在碳化合物质这一事实的。 来自《简明英汉词典》
4 5p3xr     
n.浮现,显现,出现,(植物)突出体
参考例句:
  • the last decade saw the emergence of a dynamic economy.最近10年见证了经济增长的姿态。
  • language emerges and develops with the emergence and development of society.语言是随着社会的产生而产生,随着社会的发展而发展的。
5 da3aff64f83e01ef85af6da3b7d675d5     
n.熔炼v.熔炼,提炼(矿石)( smelt的现在分词 )
参考例句:
  • a method of smelting iron 一种炼铁方法
  • fire provided a means of smelting ores. 火提供了熔炼矿石的手段。 来自辞典例句
6 3dhxf     
n.一千年,千禧年
参考例句:
  • for two millennia, exogamy was a major transgression for jews. 两千年来,异族通婚一直是犹太人的一大禁忌。
  • in the course of millennia, the dinosaurs died out. 在几千年的时间里,恐龙逐渐死绝了。
7 0v2zi     
n.考古学
参考例句:
  • she teaches archaeology at the university.她在大学里教考古学。
  • he displayed interest in archaeology.他对考古学有兴趣。
8 5wezxw     
n.雕刻品,雕花
参考例句:
  • all the furniture in the room had much carving.房间里所有的家具上都有许多雕刻。
  • he acquired the craft of wood carving in his native town.他在老家学会了木雕手艺。
9 x7dzo     
n.一千年,千禧年;太平盛世
参考例句:
  • the whole world was counting down to the new millennium.全世界都在倒计时迎接新千年的到来。
  • we waited as the clock ticked away the last few seconds of the old millennium.我们静候着时钟滴答走过千年的最后几秒钟。
10 764fbc41c009161f6b18cf20096cc96b     
adj.陨石的
参考例句:
  • the momentum of the particles was deduced from meteoritic velocities. 粒子的冲量可以从陨石速度推导出来。 来自互联网
11 flryq     
n.合金,(金属的)成色
参考例句:
  • the company produces titanium alloy.该公司生产钛合金。
  • bronze is an alloy of copper and tin.青铜是铜和锡的合金。
12 iwizn     
adj.易碎的;脆弱的;冷淡的;(声音)尖利的
参考例句:
  • the pond was covered in a brittle layer of ice.池塘覆盖了一层易碎的冰。
  • she gave a brittle laugh.她冷淡地笑了笑。
13 hzxyu     
n.铜;铜币;铜器;adj.铜(制)的;(紫)铜色的
参考例句:
  • the students are asked to prove the purity of copper.要求学生们检验铜的纯度。
  • copper is a good medium for the conduction of heat and electricity.铜是热和电的良导体。
14 3cafdb6f7c26ffe41daf7aa353505858     
v.挖掘( excavate的过去式和过去分词 );开凿;挖出;发掘
参考例句:
  • the site has been excavated by archaeologists. 这个遗址已被考古学家发掘出来。
  • the archaeologists excavated an ancient fortress. 考古学家们发掘出一个古堡。 来自《简明英汉词典》
15 ur9z7     
n.坟墓,墓地,坟场
参考例句:
  • he was buried in the cemetery.他被葬在公墓。
  • his remains were interred in the cemetery.他的遗体葬在墓地。
16 77e49c02c5fb1fe2e59b1a771002f409     
已被腐蚀的
参考例句:
  • rust has corroded the steel rails. 锈侵蚀了钢轨。
  • jealousy corroded his character. 嫉妒损伤了他的人格。
17 wway2     
adj.流星的,转瞬即逝的,突然的
参考例句:
  • in my mind,losing weight is just something meteoric.在我眼中,减肥不过是昙花一现的事情。
  • his early career had been meteoric.他的早期生涯平步青云。
18 8247a394cf7f4566ae93232e91c291b9     
n.中子( neutron的名词复数 )
参考例句:
  • the neutrons and protons form the core of the atom. 中子和质子构成了原子核。 来自《简明英汉词典》
  • when an atom of u235 is split,several neutrons are set free. 一个铀235原子分裂时,释放出几个中子。 来自《简明英汉词典》
19 kpmwq     
n.(织物)质地;(材料)构造;结构;肌理
参考例句:
  • we could feel the smooth texture of silk.我们能感觉出丝绸的光滑质地。
  • her skin has a fine texture.她的皮肤细腻。
20 6cddb7353e699051a384686b6b3ff1e2     
vi.起源;由来;衍生;导出v.得到( derive的过去式和过去分词 );(从…中)得到获得;源于;(从…中)提取
参考例句:
  • many english words are derived from latin and greek. 英语很多词源出于拉丁文和希腊文。 来自《简明英汉词典》
  • he derived his enthusiasm for literature from his father. 他对文学的爱好是受他父亲的影响。 来自《简明英汉词典》
21 nvvzwy     
adv.令人信服地,确凿地
参考例句:
  • all this proves conclusively that she couldn't have known the truth. 这一切无可置疑地证明她不可能知道真相。 来自《简明英汉词典》
  • from the facts,he was able to determine conclusively that the death was not a suicide. 根据这些事实他断定这起死亡事件并非自杀。 来自《简明英汉词典》
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