Recording "memories" : the oral history of a Japanese POW in Siberia (3) : internment in Birobidzhan and Khabarovsk

シベリア抑留は、日ロ関係に横たわる重要な歴史問題だが、研究は長年進まず、近年活性化の兆しを見せているものの、抑留者の高齢化や死去で抑留経験の聴取は喫緊の課題になっている。本稿は、筆者の祖父・本山新一へのインタビュー聴取に基づいてシベリア抑留の「記憶」を「記録」する試みである。本稿では、1945年9月から4年間の抑留を記録対象とし、既存研究や資料に基づく事実の検証、あるいは抑留全体の議論と個人の経験を接合する作業に注力した。新川達郎教授退職記念号退職記念論文(Article in commemoration of the retirement of Professor Tatsuro Niikawa)application/pdfdepartmental bulletin pape

The Ukraine war in the perspective of past Russian wars : "Lessons" and "Miscalculations" from the Chechen war and the Russo-Georgian war

本稿は、ロシアによる過去の紛争のうち、チェチェン紛争とジョージア戦争を再検討し、「両紛争でロシアが得た「教訓」とは何だったのか」、また「この「教訓」がウクライナ戦争にいかに生かされ、あるいは、生かされなかったのか」を明らかにした。すなわち、ロシアが戦争遂行の障害となる問題に対応するという意味での「教訓」は生かしたが、戦争遂行過程で発生する問題に対応するという意味での教訓は生かしていないのである。山谷清志教授退職記念号退職記念論文(Article in commemoration of the retirement of Professor Kiyoshi Yamaya)departmental bulletin pape

Observation of B+→ψ(3770)K+

journal articl

Measurement of branching fraction and time-dependent CP asymmetry parameters in B^0 → D^*+D^*-K^{0}_{S}decays

We present a measurement of the branching fraction and time-dependent CP violation parameters for B^0 → D^*+D^*-K^{0}_{S} decays. These results are obtained from a 414 fb^{-1} data sample that contains 449×10^6 B\bar{B} pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We obtain the branching fraction, B(B^0→D^*+D*^-K^{O}_{S})= [3.4±0.4(stat)±0.7(syst)]×10^-3, which is in agreement with the current world average. We also obtain an upper limit on the product branching fraction for a possible two-body decay, B(B^0 → D_s1^+(2536)D^*-)B(D_s1^+(2536)→ D^*+K^{O}_{S})s^+, where s^±[equivalent]m2(D^*±K^{0}_{S}), we extract the CP violation parameters, J_c/J_0=0.60^{+0.25}_{-0.28}(stat)±0.08(syst), 2J_s1/J_0sin2φ_1=-0.17^{+0.42}_{-0.42}(stat)±0.09(syst), 2J_s2/J_0cos2φ_1=-0.23^{+0.43}_{-0.41}(stat)±0.13(syst). A large value of J_c/J_0 would indicate a significant resonant contribution from a broad unknown D_s^**+ state. Although the sign of the factor, 2J_s2/J_0, can be deduced from theory, no conclusion can be drawn regarding the sign of cos2φ_1 given the errors.journal articl

Nonmagnetic Layer Thickness Dependence of Exchange Bias and Coercive Fields in NiFe/NM/FeMn (NM = Cu, Ru) Trilayers with Long-Range Exchange Bias Effect

Trilayer films consisting of ferromagnetic NiFe, nonmagnetic Cu or Ru, and antiferromagnetic FeMn layers were prepared by sputtering technique. The long-range exchange bias properties were investigated with magnetization curve measurements for the trilayer films with various nonmagnetic layer thicknesses tNM between 0 and 12 A. Both the exchange bias and coercive fields were observed in the magnetic hysteresis curves (M?H curves) of all trilayer films. When tNM was increased, the exchange and coercive fields determined from the M?H curves showed exponential decrease [exp(?tNM/λ)] with almost the same attenuation length λ. The cause of the observed behavior was discussed on the basis of numerical calculations using an extended Meiklejohn and Bean model in which distribution of the magnetic anisotropy in the antiferromagnetic layer was introduced.journal articl

「自律学習の推進」「英語学習の質保証」「国際交流の推進」

departmental bulletin pape

Fungal model system and experimental setup.

<p>(<b>a</b>) Melanized cell of the fungus <i>C. neoformans</i>: immunofluorescent image shows the melanin layer contiguous with the cell wall (left panel) and light microscopy image of the same cell (right panel). (<b>b–c</b>) External and internal views of the X-RAD 320 biological irradiator, which was used for continuous X-ray irradiation of <i>C. neoformans</i> cells. The cells were suspended in liquid medium in test tubes inserted into the sample rack. Radiation quality and dose rate were adjusted by varying the peak energy, current, filter, lead shielding thickness, and distance from the source.</p

Analysis of the proliferation of <i>C. neoformans</i> continuously X-irradiated for 24 hours.

<p>The symbols represent radiation-induced change (Q_e) in CFU/ml (normalized by the initial cell concentration) measured for melanized and non-melanized cells at each combination of X-ray peak energy (150 or 320 kVp) and dose rate. Different symbol colors, shapes, and bar colors represent different experiments. Horizontal bars indicate mean values from each experiment. The lines are best-fit predictions generated by the proposed model, Q = A(e, t, m) – [B(e, t, m) x R], which predicts the radiation effect on proliferation relative to background conditions (Q, shown on the y-axis), based on radiation dose rate (R shown on the x-axis), X-ray peak energy (e), duration of irradiation (t), and cell melanization status (m). Model parameter A represents radiation-induced growth enhancement at low dose rates, and parameter B represents radiation-induced growth inhibition, proportional to dose rate.</p

Analysis of the proliferation of <i>C. neoformans</i> continuously X-irradiated for 48 hours.

<p>Interpretations for the axes, symbols, and curves are the same as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0085561#pone-0085561-g003" target="_blank">Figure 3</a>.</p

Analysis of best-fit model parameter values.

<p>The proposed model, Q = A(e, t, m) – [B(e, t, m) x R], which predicts the radiation effect on proliferation relative to background conditions (Q), based on radiation dose rate (R), X-ray peak energy (e), duration of irradiation (t), and cell melanization status (m), was fitted to 10,000 Monte Carlo simulated data sets, generated from each observed data set by nonparametric bootstrapping. This procedure was repeated for 8 observed data sets, which represent combinations of 150 or 320 kVp X-ray peak energy, 24 or 48 hour exposure duration, and positive or negative cell melanization status (mel+or mel –). Each “cloud” of points represents the spread of values for model parameters A and B which are consistent with the corresponding data set, randomly varied by bootstrapping. Black open symbols superimposed on each “cloud” represent best-fit parameter values to the observed data (unperturbed by bootstrapping).</p