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2021年2月の特集「あの時代へWARP！：戦国時代編」を掲載しました。

2020年12月の月間アクセスランキングを掲載しました。

2021年1月の特集「New Archived Websites」を掲載しました。

タイトル: Assessment of vertical accuracy of open source 30m resolution space-borne digital elevation models著者: Talchabhadel, Rocky; Nakagawa, Hajime; Kawaike, Kenji; Yamanoi, Kazuki; Thapa, Bhesh Raj抄録: Highly accurate air-borne Digital Elevation Models (DEMs) are not commonly available in most regions of the world, particularly developing countries like Nepal. Better topographic data are required to assess catchment hydrology, flood/inundation propagation, and sediment transport/deposition. Ground-based surveys (i.e., topographic and bathymetry) and Light Detection and Ranging (LIDAR) are expensive in terms of cost and time. We rely mostly on space-borne DEMs when the area of interest is quite large. And, for river cross-sections at specific regions, ground-based surveys are conducted at some regular intervals. The ALOS World 3 D − 30 m (AW3D30), ASTER Global DEM Version 3 (ASTER GDEM v3), SRTM-30, and Carto DEM v3 are some of the popular and latest space-borne DEMs ...

タイトル: Measurements and Monte Carlo simulations of high-energy neutron streaming through the access maze using activation detectors at 24 GeV/c proton beam facility of CERN/CHARM著者: Nakao, Noriaki; Kajimoto, Tsuyoshi; Sanami, Toshiya; Froeschl, Robert; Iliopoulou, Elpida; Infantino, Angelo; Yashima, Hiroshi; Oyama, Takahiro; Nagaguro, Seiji; Lee, Eunji; Matsumoto, Tetsuro; Masuda, Akihiko; Uwamino, Yoshitomo; Roesler, Stefan; Brugger, Markus抄録: A measurement of high-energy neutron streaming was performed through a maze at the CERN (Conseil Européen pour la Recherche Nucléaire) High-energy AcceleRator Mixed-field (CHARM) facility. The protons of 24 GeV/c were injected onto a 50-cm-thick copper target and the released neutrons were streamed through a maze with several corridor-legs horizontally designed with the shield walls in the facility. Streaming neutrons were measured by using aluminum activation detectors placed at 10 locations in the maze. From the radionuclide p ...

タイトル: Frequency Mixing of Elastic Waves at a Nonlinear Spring-Type Interface著者: Biwa, Shiro; Takahashi, Takuya抄録: Nonlinear frequency mixing of elastic waves, i.e., the generation of sum- and difference-frequency components by the interaction of two waves of different frequencies, is currently attracting active attention in the field of nondestructive testing as a means to characterize closed defects in structural components. In this study, a nonlinear spring-type interface model, characterized by two linear stiffness parameters and three nonlinearity parameters, is used to analyse the frequency mixing of two monochromatic plane longitudinal waves incident on an interface between two linear elastic bodies. A perturbation technique is used to linearize the problem of analyzing the reflection/transmission of the fundamental components and the generation/radiation of the sum- and difference-frequency components at the interface. The propagation directions of these nonlinea ...

タイトル: 真空内微小液滴への重イオン照射システムの開発: 重イオン誘起反応の質量分析学的研究著者: 間嶋, 拓也抄録: A new experimental system that enables mass spectrometric studies of secondary ions emitted from microdroplet surfaces has been developed to investigate the complex reaction processes included by MeV-energy heavy ions on liquid surfaces. In particular, coincidence measurements with forward-scattered ions provide and negative secondary ions. In addition, the penetration length of projectile ions in droplet targets was evaluated from the amount of energy loss of the forward-scattered ions. The results propose the existence of unknown “submicron effects”, such as a variation in the mass distribution and kinetic energy of secondary ions in the submicron scale. This review article presents a detail of the experimental system and examples of the results demonstrated with ethanol droplets.

タイトル: 子宮体癌IA期に対するロボット支援下手術の手術成績に関する後方視的検討著者: 千草, 義継; 兪, 沙英; 堀川, 直城; 岡本, 葉留子; 砂田, 真澄; 浮田, 真沙世; 山ノ井, 康二; 山口, 建; 堀江, 昭史; 万代, 昌紀抄録: Objective: This study aimed to analyze the surgical outcomes of robotic-assisted surgery for early-stage endometrial cancer compared with those of laparoscopic surgery and laparotomy. Methods: The clinical data and perioperative outcomes of stage IA endometrial cancer patients who underwent total hysterectomy, bilateral salpingo-oophrectomy, and pelvic lymphadenectomy by robotic-assisted surgery, laparoscopic surgery or laparotomy from January 2011 through December 2020 were reviewed and analyzed retrospectively. Results: A total of 122 patients were eligible (robotic-assisted surgery, n=24; laparoscopic surgery, n=72; laparotomy, n=26). The median operation time for robotic-assisted surgery was lon ...

2020年11月の月間アクセスランキングを掲載しました。

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