カーボンナノチューブ三次元集電体に基づく高エネルギー密度LixSi-S電池の開発

早大学位記番号:新8393早稲田大

Monopole-vortex complex in a theta vacuum

We discuss aspects of the monopole-vortex complex soliton arising in a hierarchically broken gauge system, G to H to 1, in a theta vacuum of the underlying G theory. Here we focus our attention mainly on the simplest such system with G=SU(2) and H=U(1). A consistent picture of the effect of the theta parameter is found both in a macroscopic, dual picture and in a microscopic description of the monopole-vortex complex soliton.Comment: 18 pages 3 figure

Chemical composition and their characteristics of shallow ice cores drilled at Dome Fuji, East Antarctica

第3回極域科学シンポジウム　横断セッション「海・陸・氷床から探る後期新生代の南極寒冷圏環境変動」11月27日（火） 国立国語研究所 ２階講

7種海藻中における第4級アンモニウム塩基の分布

最近,海洋生化学資源の開発が重要視され,海産物由来のいくつかの有効物質が単離・同定されて,その生化学的および薬理学的役割が検討されてきている。その中で,海藻中にも2,3の有効物質が明らかにされてはいるものの,その数は少ない。本研究では,海藻中の有効物質が含窒素化合物に多いことから,海藻中の第4級アンモニウム塩基を7種の紅藻および緑藻を用いて検索した。 各海藻の70%エタノール抽出液中の第4級アンモニウム塩基をイオン交換カラムクロマトグラフィーを用いて単離・精製し,そのTLC上のRf値,IRスペクトルおよび融点を測定して,購入および合成した既知の第4級アンモニウム塩基のそれらと比較することにより同定した。その結果, laminine, candicine, stachydrine, glycine betaine, betonicine, β-homobetaineおよびγ-boutyrobetaineと2種の未同定塩基を検出した。candicineが海藻中から単離・同定されたのは,今回が最初と思われる。これら塩基の海藻種間における分布に関しては,特に特異性は認められなかった。Seven species of marine red and green algae were examined for quaternary ammonium bases. Nine bases were purified and isolated by ion exchange column chromatography from the ethanolic extracts of the algae. The isolated bases were identified by measuring their Rf values in thin layer chromatography, infrared spectra and melting points in comparison with specimen of thirteen kinds of authentic quaternary ammonium bases which were prepared by commercial means or syntheses. As the results, seven bases; laminine, candicine, stachydrine, glycine betaine, betonicine, β-homobetaine and γ-butyrobetaine, and two unidentified bases were detected. It was first demonstrated that candicine is present in marine algae. There is no essential difference in the distribution of the bases among the species of marine algae examined here

Factors Influencing Breast Density in Japanese Women Aged 40-49 in Breast Cancer Screening Mammography

A relatively large number of women in their 40s with high-density breasts, in which it can be difficult to detect lesions, are encountered in mammography cancer screenings in Japan. Here, we retrospectively investigated factors related to breast density. Two hundred women (40-49 years old) were examined at the screening center in our hospital. Multivariate analysis showed that factors such as small abdominal circumference, high HDL cholesterol, and no history of childbirth were related to high breast density in women in their 40s undergoing mammography. Other non-mammographic screening methods should be considered in women with abdominal circumferences ＜76cm, HDL-C >53mg/dl, and no history of childbirth, as there is a strong possibility of these women having high-density breasts that can make lesion detection difficult

SuperDARN future plan for Phase X JARE project

The Tenth Symposium on Polar Science/Special session: [S] Future plan of Antarctic research: Towards phase X of the Japanese Antarctic Research Project (2022-2028) and beyond, Tue. 3 Dec. / Entrance Hall (1st floor) at National Institute of Polar Research (NIPR

Usefulness and Problems of Endoscopic Ultrasonography in Prediction of the Depth of Tumor Invasion in Early Gastric Cancer

The objectives of this study were to evaluate the accuracy of endoscopic ultrasonography (EUS) in local and regional staging of early gastric cancer, to analyze the factors influencing the accuracy of EUS, and to reveal the usefulness and problems of EUS in pre-treatment staging of gastric cancer. We examined 105 lesions in 104 patients with histologically confirmed gastric cancer and retrospectively evaluated them with EUS. The diagnostic accuracy, sensitivity, and specificity of EUS were determined by comparing the pre-treatment EUS with the postoperative histopathological findings. The overall diagnostic accuracy of EUS for the depth of cancer invasion was 86%. The overall sensitivity and specificity were 60% and 96%, respectively. The accuracy significantly declined in lesions located in the upper-third of the stomach (70%). Type 0-I lesions tended to be over-staged (12&), and the upper-third lesions tended to be under-staged (23%). The accuracy significantly declined in differentiated adenocarcinoma with massive submucosal invasion (56.5%). EUS is useful for evaluating the depth of gastric cancer invasion which determines the feasibility of endoscopic treatment. However, it is noteworthy that the diagnostic accuracy of the invasion depth diminished for lesions in the upper third of the stomach