Video Experimental Relacionado
Updated: May 4, 2026

07:53
Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
Published on: April 27, 2019
7.6K
Los hachas manuales más antiguos de Europa
1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709, USA.
Nature
|September 4, 2009
Resumen
Los primeros humanos usaron hachas de mano en Europa mucho antes de lo que se pensaba. Una nueva datación de sitios españoles revela que esta tecnología paleolítica clave existía en Europa hace 0,9 millones de años, no hace 0,5 millones de años.
Área de la Ciencia:
- Arqueología Arqueología.
- Estudios sobre el Paleolítico.
- Evolución humana La evolución humana es la evolución de los seres humanos.
Sus antecedentes:
- Las herramientas de piedra proporcionan información sobre el comportamiento humano temprano y los avances tecnológicos.
- Las grandes herramientas de corte, como los hachas de mano, aparecieron en la tecnología africana hace alrededor de 1,5 millones de años durante el Pleistoceno Temprano.
- La evidencia previa sugería que la llegada de estas herramientas a Europa fue significativamente más tarde, durante el Pleistoceno Medio.
Videos de Conceptos Relacionados
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

