ヨーロッパで最も古い手斧です
1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709, USA.
Nature
|September 4, 2009
まとめ
初期の人類は,以前考えられていたよりもずっと早く,ヨーロッパで手斧を使用した. スペインの遺跡の新しい年代測定は,この重要な古石器時代の技術が,50万年前ではなく,090万年前にヨーロッパに存在していたことを明らかにしています.
科学分野:
- 考古学考古学とは
- 旧石器時代の研究
- 人間の進化 人類の進化
背景:
- 石器は,初期の人間の行動や技術的な進歩についての洞察を提供します.
- ハンドアックスなどの大きな切削道具は,約150万年前,プレイストセンの初期にアフリカの技術に登場しました.
- 以前の証拠によると,これらの道具のヨーロッパへの到着は, Middle Pleistocene の間に,かなり遅かったことを示唆しています.
関連する概念動画
Machines: Problem Solving I
841
A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
841
Spanning Openings in Brick Walls
687
In brick wall construction, supporting structures are crucial for openings like windows and doors to maintain the integrity and support the weight of the wall above. These supports include lintels, corbels, and arches, each serving specific structural purposes.
Lintels are primary supports used to span openings and can be crafted from materials such as reinforced concrete, steel-reinforced brick masonry, or simple steel angles. These are straightforward to install and are typically concealed...
Lintels are primary supports used to span openings and can be crafted from materials such as reinforced concrete, steel-reinforced brick masonry, or simple steel angles. These are straightforward to install and are typically concealed...
687
Ferrocement
1.1K
Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...
1.1K
Brick Cutting Techniques
1.1K
Brick-cutting techniques involve various tools and methods to shape bricks for construction. A mason's hammer with a chisel-pointed end is used for basic shaping through sharp, precise strikes. For more complex shapes requiring higher precision, a power saw with a water-cooled diamond blade is used.
Cut bricks are categorized by size. Bricks cut to half their original length are called half-bats, while those cut to three-fourths their length are known as three-fourth bats.
Special types of...
Cut bricks are categorized by size. Bricks cut to half their original length are called half-bats, while those cut to three-fourths their length are known as three-fourth bats.
Special types of...
1.1K


