@article{oai:u-fukui.repo.nii.ac.jp:00024253,
 author = {ASAKURA, Toshiyuki and DANNO, Masaru and KAWABATA, Y-ohei and FUJINAKA, Yu-zo and HAYASHI, Sho-ji},
 issue = {1},
 journal = {福井大学工学部研究報告},
 month = {Mar},
 note = {The purpose of the research is to develop the measuring device of the head loss in tunnels. This device measures the differences of pressures between two points, using two independent devices of the same construction, in order to obtain the head loss of tunnels. This device is composed of a container in which the air pressure is kept constant as the reference pressure, and is equipped with a manometer to detect the difference between the reference pressure and the ambient air pressure. In order to obtain the exact constant pressure, it is necessary for the container of the device to be kept at a constant temperature with the accuracy of 10 -3℃. Firstly, both the structure and its operation of the device with double-walled container is explained. Secondly, the dynamics of temperature may be represented as an on-off control system and its characteristics of temperature is analyzed in detail. Finally, the experimental studies are performed and the good regulation may be obtained at the high accuracy within 10-3℃.},
 pages = {91--105},
 title = {A Study on Measurements of Head Loss in Tunnels (On Control of Temperature in Measuring Device)},
 volume = {34},
 year = {1986}
}