128 research outputs found
Investigation of the author(s) and year of publication of "Kozangaku" edited by the Imperial Japanese Army Academy (Study of the History of Mathematics 2021)
No full textAs for the text book “Kōzangaku” edited by the Imperial Japanese Army Academy, it is well known that there are no evidence of who is the author and when it was published. In this paper we propose that a new candidate of the author must be Masahide Kawatani, Army Artillery Lieutenant, and the year of publication is possibly 1887 which is one year earlier than its common view
Development of X-ray Detectors Using Gas Electron Multiplier Foil for Cultural Properties
No full textFor investigation into cultural properties, X-ray radiography and material analysis using X-ray diffraction have played important roles in the field of conservation science of cultural properties. Moreover, the demand for in situ analysis will increase further. In this situation, it is valuable for conservation scientists to develop new X-ray detectors that are suitable for their own studies.
Gas Electron Multiplier foil (GEM) can be one of the powerful tools to develop a simple and portable detector at less cost. This article provides basic ideas about new X-ray detectors using GEMs for X-ray radiography filled with Xe-based mixture gas and for X-ray diffraction filled with Ar-based mixture gas.
The design and specifications for these detectors have already been fixed and these detectors are now under construction. After finishing the construction, the author plans to evaluate these detectors using a radio-isotope.journal articl
Development of Non-invasive Measurement Systems for Evaporation on the Surface of Cultural Properties
No full textIt is important to understand the water content and evaporation on the surface of mural paintings in order to prevent exfoliation of pigments, deposition of salts, fungi growth and so forth. However, there have not been many researches on such measurements
because non-invasive measurements in high-humidity environment are difficult.
In this study, a measurement system was first constructed using two small dataloggers. Measurements were conducted on the surface of the stone at Kumamoto Prefectural Ancient Buried Mound Museum. Evaporation on the surface of the stone was
identified from the gradient of absolute humidity calculated from measured values of temperature and relative humidity. One of the drawbacks of this method is that the data-logger is poor in humidity resistance and inaccurate in a high-humidity environment.
Temperature and humidity sensors which have better humidity resistance were selected to develop a new measurement system for application at humid sites. The new measurement system is composed of a control board Arduino Mega 2560, which controls
the digital signals from sensors and records the data on a micro SD card. A prototype system was constructed and evaluated in this study.journal articl
Development of Methods for Evaluating the Conditions for X-ray Radiography of Cultural Properties
No full textX-ray radiography has played an important role in the field of conservation science. Recently, the demand for in-situ analysis has increased further. In this situation, it is valuable for conservation scientists to develop new X-ray detectors that are suitable for their own studies. In addition, it is also valuable to develop methods for evaluating quantitatively the conditions for X-ray radiography ─ for instance, X-ray tube voltage and irradiation time.
For this purpose, the GEANT4 simulation software is one of the candidate tools. In this study, a wooden block with a hole was selected as a material for X-ray radiography, and interaction of X-ray and the material was calculated using GEANT4. The result of calculations was visualized also by using GEANT4.journal articl
Development of Detectors for X-ray Radiography of Cultural Properties Using Gas Electron Multiplier Foil, Part II
No full textX-ray radiography has played an important role in the field of conservation science of cultural properties. Moreover, the demand for in-situ analysis will increase further. In this situation, it is valuable for conservation scientists to develop new X-ray detectors that are suitable for their own studies.
A prototype detector, essential part of which is composed of Gas Electron Multiplier foil (GEM), for X-ray radiography has been produced. In order to obtain two dimensional images, a C-MOS sensor module was installed in the detector. The sensor covers an area of 23.0mm by 50.0mm and the pixel size is 100μm.
A lead block and an X-ray test-chart were selected as objects and two dimensional images were obtained by irradiating X-ray. From the result of data analysis, it is verified that signals due to X-ray were detected by using the GEM detector and C-MOS sensor module.journal articl
Measurements of Air Temperature, Humidity and Surface Temperature of a Steel Shelf in a Storage
No full textjournal articl
MEASUREMENT OF ATTENUATION LENGTH IN ROCK SALT AND LIMESTONE IN RADIO WAVE FOR ULTRA-HIGH ENERGY NEUTRINO DETECTOR
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