5 research outputs found
Magnetic Phase Transition and Magnetization Plateau in CsCuBr
The crystal structure of CsCuBr is the same as that of
CsCuCl, which has been characterized as a spin-1/2
quasi-two-dimensional frustrated system. The magnetic properties of
CsCuBr were investigated by magnetization and specific heat
measurements. The phase transition at zero magnetic field was detected at
K. It was observed that the magnetization curve has a plateau
at about one-third of the saturation magnetization for magnetic field
parallel to the - and -axes, while no plateau was observed for
. The field-induced phase transition to the plateau state appears
to be of the first order. The mechanism leading to the magnetization plateau is
discussed.Comment: 6 pages, 4 figures, 4 eps files, ptptex, will appear in Supplement of
Progress in Theoretical Physic
Direct Comparison of Distant Optical Lattice Clocks at the Uncertainty
Fiber-based remote comparison of Sr lattice clocks in 24 km distant
laboratories is demonstrated. The instability of the comparison reaches
over an averaging time of 1000 s, which is two orders of
magnitude shorter than that of conventional satellite links and is limited by
the instabilities of the optical clocks. By correcting the systematic shifts
that are predominated by the differential gravitational redshift, the residual
fractional difference is found to be , confirming
the coincidence between the two clocks. The accurate and speedy comparison of
distant optical clocks paves the way for a future optical redefinition of the
second
視野左方偏倚が線分二等分試験に及ぼす影響 : Head Mounted Displayを用いた若年健常者に対する検討
Objective: The purpose of this study was to verify the effect on spatial perception in healthy young subjects of an unconscious leftward optical shift created by a head-mounted display (HMD) with an offset camera. Methods: We recruited 40 healthy right-handed adults who were divided into four groups according to the hand used in the tests and the visual direction displayed by the HMD (centered or 10° left). Each of the four groups (n = 10) undertook line bisection tasks across four combinations of variables: using a finger/stick or a mouse to point at a touch panel located 60 or 120 cm away from the subject. Results: According to the results, regardless of the hand used, when the index finger or a stick was used (reaching condition), the line bisection point was displaced significantly to the left of the center. Additionally, a major left-displacement trend was observed in the short-distance reaching task, which did not require the use of a stick. In contrast, the long-distance task required a stick to be used, and the left displacements were all smaller than those for the short-distance tasks that used the index finger. Conclusion: This finding may be explained by the subjects having sufficient experience coordinating hand and eye movements in the condition where they used their dominant hand and reached with their own arms without using a stick.東京都立大学学位論文甲第1160号 副論
Leftward Optical Shift Induces Bias in Line Bisection : A Study with Healthy Subjects Using a Head-mounted Display
Combined Pre-Supernova Alert System with Kamland and Super-Kamiokande
International audiencePreceding a core-collapse supernova, various processes produce an increasing amount of neutrinos of all flavors characterized by mounting energies from the interior of massive stars. Among them, the electron antineutrinos are potentially detectable by terrestrial neutrino experiments such as KamLAND and Super-Kamiokande via inverse beta decay interactions. Once these pre-supernova neutrinos are observed, an early warning of the upcoming core-collapse supernova can be provided. In light of this, KamLAND and Super-Kamiokande have been monitoring pre-supernova neutrinos since 2015 and 2021, respectively. Recently, we performed a joint study between KamLAND and Super-Kamiokande on pre-supernova neutrino detection. A pre-supernova alert system combining the KamLAND detector and the Super-Kamiokande detector is developed and put into operation, which can provide a supernova alert to the astrophysics community. Fully leveraging the complementary properties of these two detectors, the combined alert is expected to resolve a pre-supernova neutrino signal from a 15 M star within 510 pc of the Earth, at a significance level corresponding to a false alarm rate of no more than 1 per century. For a Betelgeuse-like model with optimistic parameters, it can provide early warnings up to 12 hours in advance