中生代から新生代にかけてのプレート沈み込みに起因するマグマの特徴

Mesozoic through Cenozoic magmatic evolution of East Asia was governed by oceanic plate subduction responsible for generation of a high-velocity anomaly, known as "the stagnated slab", at the mantle transition zone and the low-velocity Transbaikal mantle domain at depth of 200-350km. Based on spatial-temporal distribution of magmatic activity, the anomalous mantle region is suggested to be a time-integrated expression of subduction processes. High- and low-velocity material could be stored firstly during closing of the Mongolia-Okhotsk Ocean finalized at ca. 140Ma. After terrane accretion and structural reorganization at 113-107Ma, subduction of the Kula-Izanagi plate defined the northern margin of the anomalous mantle region. Low-velocity anomalies extended from a continental margin landward over 1000km beneath Aldan shield of the Siberian craton. The structural reorganization between 65 and 50Ma took place contemporaneously with accretion of the Okhotsk Sea plate to Eurasia. Block rotation and extension at the continental margin were accompanied by formation of the oblique Sikhote-Alin slab flexure of the Pacific plate. Afterwards, the slab flexure was widening to the south due to landward growing of the directly subducted Honshu-Khingan slab fragment. The latter resulted in development of the southern margin of the anomalous mantle region. The structural reorganization between 21 and 15Ma was coeval to accretion of the Philippine Sea plate to Eurasia with formation of the Japan-Korea oblique slab flexure, trench rolling-back effect, block rotations, and extension at the continental margin. The present-day subduction activity of the Pacific slab is focused at the oblique Japan-Korea and direct Hokkaido-Amur flexures.論文Articl

相関雑音除去に基づくミリ波サブミリ波分光のための周波数変調観測手法の開発

学位の種別: 課程博士審査委員会委員 : （主査）東京大学教授 阪本 成一, 東京大学教授 宮田 隆志, 東京大学教授 川邊 良平, 統計数理研教授 池田 思朗, 国立天文台教授 亀野 誠二University of Tokyo(東京大学

Accuracy and Time Delay of Glucose Measurements of Continuous Glucose Monitoring and Bedside Artificial Pancreas During Hyperglycemic and Euglycemic Hyperinsulinemic Glucose Clamp Study

Background: Glucose values of continuous glucose monitoring (CGM) have time delays compared with plasma glucose (PG) values. Artificial pancreas (STG-55, Nikkiso, Japan) (AP), which measures venous blood glucose directly, also has a time delay because of the long tubing lines from sampling vessel to the glucose sensor. We investigate accuracy and time delay of CGM and AP in comparison with PG values during 2-step glucose clamp study. Methods: Seven patients with type 2 diabetes and 2 healthy volunteers were included in this study. CGM (Enlite sensor, Medtronic, CA) was attached on the day before the experiment. Hyperglycemic (200 mg/dL) clamp was performed for 90 minutes, followed by euglycemic (100 mg/dL) hyperinsulinemic (100 μU/mL) clamp for 90-120 minutes using AP. CGM sensor glucose was calibrated just before and after the clamp study. AP and CGM values were compared with PG values. Results: AP values were significantly lower than PG values at 5, 30 minute during hyperglycemic clamp. In comparison, CGM value at 0 minute was significantly higher, and its following values were almost significantly lower than PG values. The time delay of AP and CGM values to reach maximum glucose levels were 5.0 ± 22.3 (NS) and 28.6 ± 32.5 (p<0.05) min, respectively. Mean absolute rate difference of CGM was significantly higher than AP (24.0 ± 7.6 vs. 15.3 ± 4.6, p < 0.05) during glucose rising period (0-45 min), however, there are no significant difference during other periods. Conclusions: Both CGM and AP failed to follow plasma glucose values during non-physiologically rapid glucose rising, however, indicated accurate values during physiological glucose change