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Updated: Jul 22, 2025

Density Gradient Multilayered Polymerization DGMP: A Novel Technique for Creating Multi-compartment, Customizable Scaffolds for Tissue Engineering
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准备和测试横向分级的多层与双遗传算法和根平均平方误差优化在差异沉积的优化

Ruyu Yan, Ming Li, Qingyan Hou

    Optics express
    |July 21, 2023
    PubMed
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    一个新的双基因算法优化了硬X射线光学分级多层中的d间距错误. 这种方法精确控制厚度误差,对于先进的同步辐射和X射线源至关重要.

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    Design Example: Maintaining Level of an Embankment01:19

    Design Example: Maintaining Level of an Embankment

    Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
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    Leveling is a surveying procedure used to determine elevation differences between distant points. Elevation refers to the vertical distance above or below a reference datum, typically mean sea level (MSL). In the United States, elevations are often referenced to the mean sea level station at Father Point Rimouski along the St. Lawrence Seaway. To make the datum accessible, permanent markers are established throughout the region. These markers, called benchmarks, have known elevations. If the...
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