Publications by authors named "S Karube"
Antiferromagnetic magnons possess a distinctive feature absent in their ferromagnetic counterparts: the presence of two distinct handedness modes, the right-handed (RH) and left-handed (LH) precession modes. The magnon handedness determines the sign of spin polarization carried by the propagating magnon, which is indispensable for harnessing the diverse functionalities in magnonic devices, such as data encoding, magnon polarization-based logic systems, and quantum applications involving magnons. However, the control of coherently propagating magnon handedness in antiferromagnets has remained elusive.
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- The study aimed to assess how effective and safe it is to use F-fluorodeoxyglucose PET-CT for determining target volumes in intensity-modulated radiation therapy (IMRT) for patients with locally advanced head and neck squamous cell carcinoma (HNSCC).
- A total of 10 patients were treated using IMRT, and the target volumes were evaluated by two radiation oncologists through different imaging modalities, revealing that PET-CT provided less variability in target volume assessments compared to CT or MRI.
- The findings indicated that using PET-CT may allow for a safer reduction in gross tumor volume while achieving good local control, as evidenced by no local recurrence after a median follow-up of 37 months and manageable acute adverse effects.
The spin-splitter effect is theoretically predicted to generate an unconventional spin current with x- and z- spin polarization via the spin-split band in antiferromagnets. The generated torque, namely, spin-splitter torque, is effective for the manipulation of magnetization in an adjacent magnetic layer without an external magnetic field for spintronic devices such as MRAM. Here, we study the generation of torque in collinear antiferromagnetic RuO_{2} with (100), (101), and (001) crystal planes.
View Article and Find Full Text PDFThe bouncing ball system is a simple mechanical collision system that has been extensively studied for several decades. In this study, we investigate the bouncing ball's dynamics both numerically and experimentally. We implement the system using a table tennis ball and paddle vibrated by a shaker.
View Article and Find Full Text PDFObjective: Whole-body dynamic imaging using positron emission tomography (PET) facilitates the quantification of tracer kinetics. It is potentially valuable for the differential diagnosis of tumors and for the evaluation of therapeutic efficacy. In whole-body dynamic PET with continuous bed motion (CBM) (WBDCBM-PET), the pass number and bed velocity are key considerations.
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