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An integrated airborne gravity survey of an offshore area near the northern Noto Peninsula, Japan
Komazawa, Masao,Okuma, Shigeo,Segawa, Jiro Korean Society of Earth and Exploration Geophysici 2010 지구물리와 물리탐사 Vol.13 No.1
An airborne gravity survey using a helicopter was carried out in October 2008, offshore along the northern Noto Peninsula, to understand the shallow and regional underground structure. Eleven flight lines, including three tie lines, were arranged at 2 km spacing within 20 km of the coast. The total length of the flight lines was ~700 km. The Bouguer anomalies computed from the airborne gravimetry are consistent with those computed from land and shipborne gravimetry, which gradually decrease in the offshore direction. So, the accuracy of the airborne system is considered to be adequate. A local gravity low in Wajima Bay, which was already known from seafloor gravimetry, was also observed. This suggests that the airborne system has a structural resolution of ~2 km. Reduction of gravity data to a common datum was conducted by compiling the three kinds of gravity data, from airborne, shipborne, and land surveys. In the present study, we have used a solid angle numerical integration method and an iteration method. We finally calculated the gravity anomalies at 300 m above sea level. We needed to add corrections of 2.5 mGals in order to compile the airborne and shipborne gravity data smoothly, so the accuracy of the Bouguer anomaly map is considered to be nearly 2 mGal on the whole, and 5 mGals at worst in limited or local areas.
Effectiveness of Solution with 5% Detergent for Cleaning Transnasal Esophagogastroduodenoscopy Lens
Yoshinori Komazawa,Mika Yuki,Nobuhiko Fukuba,Yoshiya Kobayashi,Hitomi Ishitobi,Sayaka Nakashima,Makoto Nagaoka,Yoshiko Takahashi,Toshihiro Shizuku 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.2
Background/Aims: Unsedated transnasal esophagogastroduodenoscopy (EGD) is affected by a poor scope lens-cleaning function. We have previously reported good, albeit limited, effects of an oolong tea washing solution; here, we evaluated the effectiveness of a 5%lens cleaning solution for cleaning an EGD lens. Methods: Five percent lens cleaning solution (C), 5% dimethicone solution (D), and distilled water (W) were prepared. Study I:Lenses were soiled with pork grease, washed with each washing solution, and their image quality was judged. Study II: Patients (n=996)scheduled for transnasal EGD were randomly assigned to the C- or W-group. Lens cleanliness level, washing solution volume used,and endoscopist stress due to lens contamination were determined. Results: Study I: The image quality of the lenses washed with (C) was significantly superior. (D) was clinically unsuitable because ofspray nozzle clogging. Study II: Lens cleaning in the C-group was significantly superior (p<0.0001) and the solution volume requiredwas significantly reduced (p<0.0001), while endoscopist stress was also lower (p<0.0001). Conclusions: For transnasal small-caliber EGD, the present 5% lens cleaning solution provided good visibility. It features a highdetergency level and is simple to formulate for therapeutic endoscopy applications, such as endoscopic submucosal dissection.
Okuma, Shigeo,Nakatsuka, Tadashi,Komazawa, Masao,Sugihara, Mitsuhiko,Nakano, Shun,Furukawa, Ryuta,Supper, Robert Korean Society of Earth and Exploration Geophysici 2006 지구물리와 물리탐사 Vol.9 No.1
Helicopter-borne aeromagnetic surveys at two different times separated by three years were conducted to better understand the shallow subsurface structure of the Vulcano and Lipari volcanic complex, Aeolian Islands, southern Italy, and also to monitor the volcanic activity of the area. As there was no meaningful difference between the two magnetic datasets to imply an apparent change of the volcanic activity, the datasets were merged to produce an aeromagnetic map with wider coverage than was given by a single dataset. Apparent magnetisation intensity mapping was applied to terrain-corrected magnetic anomalies, and showed local magnetisation highs in and around Fossa Cone, suggesting heterogeneity of the cone. Magnetic modelling was conducted for three of those magnetisation highs. Each model implied the presence of concealed volcanic products overlain by pyroclastic rocks from the Fossa crater. The model for the Fossa crater area suggests a buried trachytic lava flow on the southern edge of the present crater. The magnetic model at Forgia Vecchia suggests that phreatic cones can be interpreted as resulting from a concealed eruptive centre, with thick latitic lavas that fill up Fossa Caldera. However, the distribution of lavas seems to be limited to a smaller area than was expected from drilling results. This can be explained partly by alteration of the lavas by intense hydrothermal activity, as seen at geothermal areas close to Porto Levante. The magnetic model at the north-eastern Fossa Cone implies that thick lavas accumulated as another eruption centre in the early stage of the activity of Fossa. Recent geoelectric surveys showed high-resistivity zones in the areas of the last two magnetic models.