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Related Concept Videos

Vertical Curve: Problem Solving01:23

Vertical Curve: Problem Solving

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Vertical curves provide the transition between two roadway grades, ensuring safety, comfort, and functionality. Calculating elevations at specific stations along the curve involves several systematic steps based on the curve's geometry and provided design parameters.The vertical curve is defined by its length, grades, Point of Vertical Intersection (P.V.I.) location, and P.V.I. elevation. The stations of the Point of Vertical Curvature (P.V.C.), where the curve begins, and the Point of Vertical...
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Vertical curves are parabolic transitions that connect different grades on highways and railroads, ensuring a smooth alignment between back and forward tangents. The back tangent represents the initial grade, while the forward tangent defines the subsequent grade. These curves can be symmetrical, with equal tangent lengths, or nonsymmetrical, with varying lengths. The key points defining a vertical curve include the Point of Vertical Intersection (P.V.I.), where the tangents meet; the Point of...
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Elevation of Intermediate Points on Vertical Curves01:20

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Vertical curves are essential in roadway design because they provide smooth transitions between varying roadway grades. Designing vertical curves involves calculating intermediate elevations and identifying the curve's highest or lowest point, which is essential for optimal roadway performance.Intermediate elevations on a vertical curve are determined using the tangent offset method. This method considers the initial elevation at the start of the curve, the grades, and the curve's geometry. The...
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Sight Distance in a Vertical Curve01:29

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Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...
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Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
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Related Experiment Video

Updated: Jan 23, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Two-Photon Vertical-Flow Lithography for Microtube Synthesis.

Jonas Lölsberg1,2, Arne Cinar2, Daniel Felder1,2

  • 1DWI - Leibniz-Institute for Interactive Materials, Forckenbeckstr. 50, 52074, Aachen, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|June 7, 2019
PubMed
Summary

Two-photon vertical-flow lithography creates high-aspect-ratio polymer microtubes. This microfluidic method enables precise control over microtube dimensions for advanced biomedical applications.

Keywords:
continuous-flow lithographydirect laser writingmicrofluidic synthesismicrotube scaffoldstwo-photon polymerization

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Area of Science:

  • Materials Science
  • Microfluidics
  • Biotechnology

Background:

  • Advanced fabrication techniques are needed for complex microstructures.
  • Polymeric microtubes have potential in various biomedical applications.

Purpose of the Study:

  • To demonstrate a novel method for synthesizing complex-shaped polymeric microtubes.
  • To achieve high aspect ratios and precise control over microtube morphology.

Main Methods:

  • Utilized two-photon vertical-flow lithography.
  • Integrated fluid-flow control with high-resolution lithography.

Main Results:

  • Successfully synthesized polymeric microtubes with aspect ratios >100:1.
  • Achieved tunable diameters (1-400 µm) and pore sizes (1-20 µm).
  • Generated thin-walled microtubes (<1 µm).

Conclusions:

  • Two-photon vertical-flow lithography is a versatile method for microtube fabrication.
  • This technique offers precise control over microtube morphology and surface topology.
  • The developed method can significantly advance the development of biocompatible scaffolds, stents, and other medical devices.