CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.
As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
i
Propagation of UHF radio waves in limestone room and pillar mines : summary report
-
January 1979
-
Series: Mining Publications
[PDF-1.04 MB]
Details:
-
Personal Author:
-
Corporate Authors:
-
Description:"This report presents a mathematical model for the propagation of UHF radio waves in the large cross section tunnels of a room-and-pillar limestone mine and describes the analysis of a small amount of propagation data obtained. The model and analysis is based on the waveguide mode theory, developed earlier for the transmission of UHF waves in coal mine tunnels, with allowance for propagation losses due to refraction into the tunnel walls. Propagation around corners and through pillars is also examined based on a ray theory approach together with the beneficial effects of placing reflectors at intersections to significantly reduce corner losses. The theory is found to be in fair agreement with the data; however, additional in- mine measurements are needed to provide a more conclusive test of the model." - NIOSHTIC-2
NIOSHTIC no. 10002336
-
Subjects:
-
Series:
-
Subseries:
-
Document Type:
-
Funding:
-
Pages in Document:vi, 36 numbered pages
-
NIOSHTIC Number:10002336
-
Resource Number:OFR 27-82; Contract-J0377065; Contract-J0387217
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
