«tunnel cross section»
۱۳۵۵ نتیجهContinuous Extraction of Subway Tunnel Cross Sections Based on Terrestrial Point Clouds
An efficient method for the continuous extraction of subway tunnel cross sections using terrestrial point clouds is proposed. First, the continuous central axis of the tunnel is extracted using a 2D projection of the point cloud and curve fitting using the RANSAC (RANdom SAmple C
Measurement and analysis of long-tunnel cross-sectional deformation using multi-sensor integration
A long tunnel is a typical linear man-made infrastructure. The shape, especially the cross-sectional shape, and geometric parameters of the tunnel are very important for the safety of transportation. A multi-sensor integration approach is presented to survey the shape of the tunn
Optimization of Conformal Mapping Functions used in Developing Closed-Form Solutions for Underground Structures with Conventional cross Sections
Elastic solutions applicable to single underground openings usually suffer from geometry related simplification. Most tunnel shapes possess two axes of symmetry while a wide range of geometries used in tunneling practice involve only one symmetry axis. D-shape or horse-shoe shape
optimization of conformal mapping functions used in developing closed-form solutions for underground structures with conventional cross sections
elastic solutions applicable to single underground openings usually suffer from geometry related simplification. most tunnel shapes possess two axes of symmetry while a wide range of geometries used in tunneling practice involve only one symmetry axis. d-shape or horse-shoe shape
Automatic Extraction of Tunnel Lining Cross-Sections from Terrestrial Laser Scanning Point Clouds
Tunnel lining (bare-lining) cross-sections play an important role in analyzing deformations of tunnel linings. The goal of this paper is to develop an automatic method for extracting bare-lining cross-sections from terrestrial laser scanning (TLS) point clouds. First, the combina
Changing the cross-sectional geom- etry of a bow tunnel thruster Effects on the performance of the thruster at slow forward motion using Computa- tional Fluid Dynamics
In this master thesis the flow behavior and the performance of a bow tunnel thruster at slow forward vessel motion is studied using Computational Fluid Dynamics (CFD). In this Definition Study a literature study is made, fundamental theory is explained and a roadmap for the maste
A Fast and Automated Method for Extracting Tunnel Cross-sections Using Terrestriallaser Scanned Data
In tunnel construction, overcut along with undercut estimation is one of the most important factors to be considered before proceeding to the next operation. It is currently analyzed based on sparsely sampled points surveyed using a total station, but not much time is allowed for
Radio Wave Propagation in Arched Cross Section Tunnels - Simulations and Measurements
For several years, wireless communication systems have been developed for train to infrastructure communication needs related to railway or mass transit applications. The systems should be able to operate in specific environments, such as tunnels. In this context, specific radio
The Prevalence of Cubital Tunnel Syndrome: A Cross-Sectional Study in a U.S. Metropolitan Cohort.
BACKGROUND Although cubital tunnel syndrome is the second most common peripheral mononeuropathy (after carpal tunnel syndrome) encountered in clinical practice, its prevalence in the population is unknown. The objective of this study was to evaluate the prevalence of cubital tunn
the best cutoff point for median nerve cross sectional area at the level of carpal tunnel inlet.
carpal tunnel syndrome (cts) is the most common entrapment neuropathy. it accounts 90% of all entrapment neuropathies all over the world. ultrasound is a non-invasive, cost effective and available para-clinical method which could be applied for cts diagnosis. cross-sectional area