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State-owned Comac opens offices abroad and pushes for overseas certification as it increases output of C919 jets

タイトル: A New Small-Sized Species of Orobdella (Hirudinea: Erpobdelliformes: Orobdellidae) from Mount Hehuan, Central Taiwan著者: Nakano, Takafumi; Lai, Yi-Te抄録: A small-type quadrannulate leech species of Orobdella Oka, 1895, O. minima sp. nov., from Mt. Hehuan in central Taiwan is described. Phylogenetic analyses using nuclear 18S rRNA, 28S rRNA, histone H3, mitochondrial cytochrome c oxidase subunit I, [Cys]tRNA, [Met]tRNA, 12S rRNA, [Val]tRNA, 16S rRNA, [Leu]tRNA and NADH dehydrogenase subunit 1 markers revealed that O. minima forms a clade with the middle-type quadrannulate O. ketagalan Nakano and Lai, 2012, which is endemic to northern Taiwan. This clade was sister to the other Taiwanese middle-type quadrannulate O. meisai Nakano and Lai, 2017. Based on the phylogenetic relationships among the Taiwanese Orobdella, their morphological characteristics are briefly discussed in a phylogenetic context. A key to the three species of Orobdella endemic to Taiwan is also provi ...

タイトル: Neural network ensembles for band gap prediction著者: Masuda, Taichi; Tanabe, Katsuaki抄録: The band gap energy is a critical physical property that characterizes the optical and electronic properties of semiconductors and insulators. The density functional theory has been widely employed as a method for theoretical calculation of the band gap, but it underestimates the band gap compared to the experimental value. Additionally, the hybrid functionals or the GW method, which offers higher prediction accuracy, entails high computational costs. Therefore, there has been a growing interest in data-driven approaches utilizing machine learning to mitigate computational costs and enhance prediction accuracy. Here we propose neural network ensemble learning, utilizing experimentally measured band gaps as training set to achieve rapid and highly accurate band gap predictions. Previously, research had been conducted to predict the experimental values of band gaps using ensemble ...

タイトル: NinjaSat: Astronomical X-ray CubeSat observatory著者: Tamagawa, Toru; Enoto, Teruaki; Kitaguchi, Takao; Iwakiri, Wataru; Kato, Yo; Numazawa, Masaki; Mihara, Tatehiro; Takeda, Tomoshi; Ota, Naoyuki; Watanabe, Sota; Aoyama, Amira; Iwata, Satoko; Takahashi, Takuya; Yamasaki, Kaede; Hu, Chin-Ping; Takahashi, Hiromitsu; Yoshida, Yuto; Sato, Hiroki; Hayashi, Shoki; Zhou, Yuanhui; Uchiyama, Keisuke; Jujo, Arata; Odaka, Hirokazu; Tamba, Tsubasa; Taniguchi, Kentaro抄録: NinjaSat is an X-ray CubeSat designed for agile, long-term continuous observations of bright X-ray sources, with the size of 6U (112.7 × 237.1 × 340.5 mm³) and a mass of 8 kg. NinjaSat is capable of pointing at X-ray sources with an accuracy of less than 0゚゚.1 (2σ confidence level) with three-axis attitude control. The satellite bus is a commercially available NanoAvionics M6P, equipped with two non-imaging gas X-ray detectors covering an energy range of 2–50 keV. A total effective area of 32 cm² at ...

タイトル: English Overview: Formation of Medieval Social Status Order and Family Rank著者: KIM, Hyunkyung記述: 令和6年度京都大学大学院文学研究科の『卓越した課程博士論文の出版助成制度』へ応募があった博士（文学）学位論文から、選考を経て、下記の7冊の書物が刊行されました。; 福田 耕佑『ニコス・カザンザキス研究―ギリシア・ナショナリズムの構造と処方箋としての文学・哲学』松籟社、2024年9月15日刊、413頁; 天王寺谷千裕『ギュスターヴ・クールベと女性表象―どう描くか、なぜ描くか』三元社、2025年2月25日刊、x＋225＋lv頁 #ja; 柴田秀樹『ミシェル・フーコー 自己変容としての文学』青土社、2025年2月28日刊、248＋xiii頁; 斎藤賢『『史記』はいかにして編まれたか―蘇秦・張儀・孟嘗君列伝の成立』京都大学学術出版会、2025年3月20日刊、iii＋272頁; ...

タイトル: Spinoza’s Theory of Ideas著者: Eifuku, Maho記述: 令和6年度京都大学大学院文学研究科の『卓越した課程博士論文の出版助成制度』へ応募があった博士（文学）学位論文から、選考を経て、下記の7冊の書物が刊行されました。; 福田 耕佑『ニコス・カザンザキス研究―ギリシア・ナショナリズムの構造と処方箋としての文学・哲学』松籟社、2024年9月15日刊、413頁; 天王寺谷千裕『ギュスターヴ・クールベと女性表象―どう描くか、なぜ描くか』三元社、2025年2月25日刊、x＋225＋lv頁 #ja; 柴田秀樹『ミシェル・フーコー 自己変容としての文学』青土社、2025年2月28日刊、248＋xiii頁; 斎藤賢『『史記』はいかにして編まれたか―蘇秦・張儀・孟嘗君列伝の成立』京都大学学術出版会、2025年3月20日刊、iii＋272頁; 久冨峻介『ドイツ古典哲学と「学」 ...

タイトル: Fundamental problems in classical German philosophy著者: KUDOMI, Shunsuke記述: 令和6年度京都大学大学院文学研究科の『卓越した課程博士論文の出版助成制度』へ応募があった博士（文学）学位論文から、選考を経て、下記の7冊の書物が刊行されました。; 福田 耕佑『ニコス・カザンザキス研究―ギリシア・ナショナリズムの構造と処方箋としての文学・哲学』松籟社、2024年9月15日刊、413頁; 天王寺谷千裕『ギュスターヴ・クールベと女性表象―どう描くか、なぜ描くか』三元社、2025年2月25日刊、x＋225＋lv頁 #ja; 柴田秀樹『ミシェル・フーコー 自己変容としての文学』青土社、2025年2月28日刊、248＋xiii頁; 斎藤賢『『史記』はいかにして編まれたか―蘇秦・張儀・孟嘗君列伝の成立』京都大学学術出版会、2025年3月20日刊、iii＋272頁; 久冨峻介『ドイ ...

タイトル: 能動的機械学習とハイスループット第一原理計算によるデータ駆動型非線形強誘電物性のひずみ最適化著者: 見波, 将; 丸山, 泰明; 阿部, 能将; 仲山, 智裕; 嶋田, 隆広抄録: Strain engineering is a crucial approach in the engineering field to optimize various physical properties of materials by applying mechanical strain loading. However, it is extremely challenging to find out the best conditions of strain with unprecedented physical properties in the vast strain space consisting of six components. Here, we developed a technical framework that enables efficient exploration of physical properties in the vast strain space based on machine learning (i.e., artificial neural networks), active learning, and high-throughput first-principles calculation. We demonstrated the active learning technique to successfully and efficiently construct an accurate machine learning model for ferroelectric PbTiO₃ with minimal first-prin ...

タイトル: Magnetosonic waves in the Martian ionosphere driven by upstream proton cyclotron waves: Two-point observations by MAVEN and Mars Express著者: Imada, K.; Harada, Y.; Fowler, C.M.; Collinson, G.; Halekas, J.S.; Ruhunusiri, S.; DiBraccio, G.A.; Romanelli, N.抄録: Recent observations from the Mars Atmosphere and Volatile EvolutioN (MAVEN) and Mars Express (MEX) spacecraft have suggested that pressure pulses originating from upstream proton cyclotron waves (PCWs) can “ring” the Martian magnetopause at the same frequency and drive magnetosonic waves in the upper ionosphere of Mars, thereby transporting energy from the solar wind into the ionosphere. However, the limitation of single-spacecraft measurements prevents simultaneous observations of the driver and response of this “ringing” process of the Martian magnetosphere. Here we utilize two-point measurements from MAVEN and MEX to characterize the ringing probability at which upstream PCWs drive compressional fluct ...

タイトル: Short-wave fadeout on mars: Radio absorption in the dayside martian ionosphere enhanced by solar flares著者: Harada, Y.; Sánchez-Cano, B.; Lester, M.; Ippolito, A.抄録: Solar flares can cause radio absorption in the D region of the Earth's ionosphere and consequently interrupt high-frequency radio communication systems, also known as short-wave fadeout or the Dellinger effect. We present an analogous radio absorption event observed at Mars during a solar flare. In this event, the Mars Express Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) instrument fortuitously operated at low altitudes on the dayside around the terminator in a favorable configuration for surface echo measurements at the flare peak. The surface echo power during the flare is abnormally weak compared to nominal echo powers at corresponding solar zenith angles, suggesting flare-induced radio absorption in the dayside lower ionosphere of Mars. Additionally, long-term MARSIS data s ...