65 research outputs found
Effect of Dy substitution in the giant magnetocaloric properties of HoB
Recently, a massive magnetocaloric effect near the liquefaction temperature
of hydrogen has been reported in the ferromagnetic material HoB. Here we
investigate the effects of Dy substitution in the magnetocaloric properties of
HoDyB alloys ( = 0, 0.3, 0.5, 0.7, 1.0). We
find that the Curie temperature () gradually increases upon
Dy substitution, while the magnitude of the magnetic entropy change || at = decreases from 0.35 to 0.15
J cm K for a field change of 5 T. Due to the presence of two
magnetic transitions in these alloys, despite the change in the peak magnitude
of ||, the refrigerant capacity () and
refrigerant cooling power () remains almost constant in all
doping range, which as large as 5.5 J cm and 7.0 J cm for a field
change of 5 T. These results imply that this series of alloys could be an
exciting candidate for magnetic refrigeration in the temperature range between
10-50 K.Comment: 19 pages, 5 figures, 2 table
Cross-Speaker Emotion Transfer for Low-Resource Text-to-Speech Using Non-Parallel Voice Conversion with Pitch-Shift Data Augmentation
Data augmentation via voice conversion (VC) has been successfully applied to
low-resource expressive text-to-speech (TTS) when only neutral data for the
target speaker are available. Although the quality of VC is crucial for this
approach, it is challenging to learn a stable VC model because the amount of
data is limited in low-resource scenarios, and highly expressive speech has
large acoustic variety. To address this issue, we propose a novel data
augmentation method that combines pitch-shifting and VC techniques. Because
pitch-shift data augmentation enables the coverage of a variety of pitch
dynamics, it greatly stabilizes training for both VC and TTS models, even when
only 1,000 utterances of the target speaker's neutral data are available.
Subjective test results showed that a FastSpeech 2-based emotional TTS system
with the proposed method improved naturalness and emotional similarity compared
with conventional methods.Comment: Submitted to Interspeech 202
Experimental exploration of ErB and SHAP analysis on a machine-learned model of magnetocaloric materials for materials design
Stimulated by a recent report of a giant magnetocaloric effect in HoB
found via machine-learning predictions, we have explored the magnetocaloric
properties of a related compound ErB, that has remained the last
ferromagnetic material among the rare-earth diboride (REB) family with
unreported magnetic entropy change |{\Delta}SM|. The evaluated
at field change of 5 T in ErB turned out to be as high as 26.1 (J kg
K) around the ferromagnetic transition () of 14 K. In this
series, HoB is found to be the material with the largest as
the model predicted, while the predicted values showed a deviation with a
systematic error compared to the experimental values. Through a coalition
analysis using SHAP, we explore how this rare-earth dependence and the
deviation in the prediction are deduced in the model. We further discuss how
SHAP analysis can be useful in clarifying favorable combinations of constituent
atoms through the machine-learned model with compositional descriptors. This
analysis helps us to perform materials design with aid of machine learning of
materials data.Comment: 9 pages, 10 figures. Accepted manuscript. Published by Taylor &
Francis in STAM:Methods, available at
https://doi.org/10.1080/27660400.2023.221747
Restoration of the Ellipsoid Zone and Visual Prognosis at 1 Year after Surgical Macular Hole Closure
Purpose. To evaluate the restoration of the ellipsoid zone (EZ) and its influence on visual prognosis 1 year after surgical macular hole (MH) closure. Method. Subjects were patients with stage 2, 3, or 4 idiopathic MH who underwent primary vitrectomy that resulted in successful hole closure. Nineteen eyes with both EZ disruption with foveal detachment and a continuous external limiting membrane on optical coherence tomography during the early postoperative period were included in this study. Result. EZ disruption was restored in 10 eyes (53%, Group A) and remained in 9 eyes (47%, Group B) at 1 year after surgery. In Group B, the diameter of the residual EZ disruption was 54.7±33.1 μm. LogMAR visual acuity (VA) 1 year after surgery was significantly better than preoperative VA in each group (Group A: -0.007±0.102; P<0.001; Group B: 0.051±0.148; P<0.001), but there was no significant difference between the 2 groups (P=0.332). There was no significant correlation between logMAR VA and EZ disruption diameter at 1 year after surgery. Conclusion. EZ was restored in 53% of eyes at 1 year after surgical closure of idiopathic MH. Mean residual EZ disruption diameter was 54.7±33.1 μm. Neither resolved nor residual EZ disruption influenced postoperative VA
Neural networks for a quick access to a digital twin of scanning physical properties measurements
For performing successful measurements within limited experimental time,
efficient use of preliminary data plays a crucial role. This work shows that a
simple feedforward type neural networks approach for learning preliminary
experimental data can provide quick access to simulate the experiment within
the learned range. The approach is especially beneficial for physical
properties measurements with scanning on multiple axes, where derivative or
integration of data are required to obtain the objective quantity. Due to its
simplicity, the learning process is fast enough for the users to perform
learning and simulation on-the-fly by using a combination of open-source
optimization techniques and deep-learning libraries. Here such a tool for
augmenting the experimental data is proposed, aiming to help researchers to
decide the most suitable experimental conditions before performing costly
experiments in real. Furthermore, this tool can also be used from the
perspective of taking advantage of reutilizing and repurposing previously
published data, accelerating data-driven exploration of functional materials.Comment: 19 pages, 5 figures + 7 pages of Supporting Informatio
Lattice Anharmonicity in BiS2-Based Layered Superconductor RE(O,F)BiS2 (RE = La, Ce, Pr, Nd)
We studied Gr\"uneisen parameter ({\gamma}G) to investigate lattice
anharmonicity in a layered BiS2-based superconductor system REO1-xFxBiS2 (RE =
La, Ce, Pr, Nd), where in-plane chemical pressure was tuned by substituting the
RE elements. With increasing in-plane chemical pressure, bulk modulus
remarkably increases, and a high {\gamma}G is observed for RE = Nd. The
dependence of {\gamma}G on in-plane chemical pressure exhibits a good
correlation with Tc, and a higher Tc is achieved when {\gamma}G is large for RE
= Nd. In addition, {\gamma}G shows a slight decrease by a decrease of F
concentration (x) in REO1-xFxBiS2. Our results show that the anharmonic
vibration of Bi along the c-axis is present in REO1-xFxBiS2, and the
enhancement of the anharmonicity is positively linked to superconducting Tc and
pairing mechanisms.Comment: 15 pages, 5 figure
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