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相关概念视频

Quarrying of Stone01:15

Quarrying of Stone

Quarrying is the process of extracting stone from a quarry, where specialized techniques are employed to remove large blocks of stone safely and efficiently. This process can involve controlled explosions or more precision-oriented methods such as cutting and drilling.
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the block.
Veneer01:19

Veneer

Veneer refers to a thin sheet of wood, typically produced to a thickness of about one-eighth of an inch or less. This material is crafted through various methods, the most common being rotary cutting. In this process, a log is mounted into a large lathe and spun against a knife edge, peeling off a continuous strip of wood as the knife penetrates deeper into the rotating log, creating a rotary-cut veneer.
Other veneering techniques include plain-slicing, quarter-slicing, and rift-slicing. These...
Brick Cutting Techniques01:08

Brick Cutting Techniques

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...

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相关实验视频

Updated: Jun 14, 2026

Fiber Connections of the Supplementary Motor Area Revisited: Methodology of Fiber Dissection, DTI, and Three Dimensional Documentation
16:23

Fiber Connections of the Supplementary Motor Area Revisited: Methodology of Fiber Dissection, DTI, and Three Dimensional Documentation

Published on: May 23, 2017

在古印第安人文物以下分层的片工具.

M J Reagan, R M Rowlett, E G Garrison

    Science (New York, N.Y.)
    |June 16, 1978
    PubMed
    概括

    密苏里州的古老石头工具揭示了早期人类的存在. 石器阶段的片工具早于古印度时代的片点,在公元前13,000年以前就有职业.

    科学领域:

    • 考古学的考古学
    • 地质时间学 (Geochronology)
    • 石化分析 石化分析

    背景情况:

    • 在密苏里州西北部的挖掘发现了利提克阶段的片工具.
    • 这些工具被发现在古印度时代的状点组件下面.
    • 这些聚合物位于两个截然不同的洛斯沉积物中,这些沉积物来自最后一次冰河时期.

    研究的目的:

    • 建立密苏里州西北部早期人类活动的时间框架.
    • 根据地层学和物质文化,区分石器阶段和古印第安人的职业.

    主要方法:

    • 采用了石器的热发光 (TL) 测年法.
    • 进行了石沉积物的地质相关性.
    • 对片工具和片点进行了石化分析.
    • 研究了文化层级学,以确定沉积序列.

    主要成果:

    • 热发光分析将古印度人的职业定于公元前8690年+/- 1000年. 和 12,855 +/- 1500 公里.
    • 立特人的舞台职业被确定为比公元前13,000年更古老.
    • 这些发现表明,文化分层结构,其中石器阶段之前的古印度人职业.

    更多相关视频

    Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)
    08:59

    Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)

    Published on: December 16, 2019

    A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
    06:29

    A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging

    Published on: February 15, 2021

    相关实验视频

    Last Updated: Jun 14, 2026

    Fiber Connections of the Supplementary Motor Area Revisited: Methodology of Fiber Dissection, DTI, and Three Dimensional Documentation
    16:23

    Fiber Connections of the Supplementary Motor Area Revisited: Methodology of Fiber Dissection, DTI, and Three Dimensional Documentation

    Published on: May 23, 2017

    Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)
    08:59

    Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)

    Published on: December 16, 2019

    A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
    06:29

    A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging

    Published on: February 15, 2021

    结论:

    • 密苏里州西北部的Lithic阶段职业比以前理解的要古老得多.
    • 该研究为了解北美最早的人类定居点的时间和顺序提供了关键数据.
    • 结合约会和石器分析证实了不同史前群体的不同,连续的职业.