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相关概念视频

Methods of Obtaining Topography01:25

Methods of Obtaining Topography

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Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
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Topographic Surveying and Contours01:29

Topographic Surveying and Contours

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Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
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Plotting of Topographic Maps01:29

Plotting of Topographic Maps

39
Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
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Precipitation Gravimetry01:03

Precipitation Gravimetry

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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Response Surface Methodology01:16

Response Surface Methodology

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Response Surface Methodology (RSM) is a collection of statistical and mathematical techniques used to develop, improve, and optimize processes. It is particularly valuable when many input variables or factors potentially influence a response variable.
The process of RSM involves several key steps:
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Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

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GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
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Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
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表面地形学可以可靠地确定里戈分类系统吗?

Natalie Schmidt1, Adam Thiessen1,2, Marissa Selthafner2

  • 1Department of Orthopaedic Surgery, Medical College of Wisconsin, Milwaukee, USA.

European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
|January 14, 2025
PubMed
概括
此摘要是机器生成的。

表面拓 (ST) 提供了一个可靠的,无辐射的替代X射线的Rigo分类系统在青少年异常学脊椎病. 在观察者内部和观察者之间,ST显示出可比或更好的可靠性和准确性,用于分类脊椎病类型和亚型.

关键词:
异常学脊椎病症是一种异常学脊椎病症.放射学 放射学 放射学 放射学可靠性 可靠性可靠性这是一个严格的分类.表面的地形图形是表面的地形.

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科学领域:

  • 整形外科和运动医学
  • 放射学和医学成像学 医学成像学
  • 生物医学工程 生物医学工程

背景情况:

  • 里戈分类系统对于脊柱脊柱病的管理至关重要.
  • 目前的方法依赖于X射线,涉及辐射暴露.
  • 表面拓 (ST) 提供了一个无辐射成像替代方案.

研究的目的:

  • 用ST与X射线相比,评估Rigo分类系统的可靠性和准确性.
  • 评估两种方法的观察者内部和观察者间可靠性 (卡帕值).
  • 为了比较ST和X射线在分类脊椎病类型和亚型中的准确性.

主要方法:

  • 分析了31名青少年特异性脊椎病患者的X射线和ST图像.
  • 三名失明的调查人员使用Rigo系统两次评估图像.
  • 卡帕值和准确率为ST和X射线计算.

主要成果:

  • 与X射线相比,ST对Rigo类型 (0.77) 和亚型 (0.74) 的观察者内可靠性略有改善 (分别为0.75和0.65).
  • 对于Rigo类型的观察者间可靠性是可比的 (ST:0.53,X射线:0.54),而ST对亚型更好 (ST:0.43,X射线:0.36).
  • 对Rigo亚型的观察者准确性高于ST (70.97%) 比X射线 (65.05%).

结论:

  • 基于ST的Rigo系统表现出非常好的体内和中度良好的体内可重复性.
  • 表面地形学是Rigo分类系统中X射线的可靠替代品.
  • 在不暴露于辐射的情况下,可以考虑在脊椎病的评估中对ST进行临床应用.