282 research outputs found
A recyclable hydrophobic anchor-tagged asymmetric amino thiourea catalyst
A novel recyclable thiourea-based, asymmetric organocatalyst containing a hydrophobic anchor has been developed. The chemical nature of the hydrophobic anchor contributes to the desirable characteristics of the recyclable catalyst. The hydrophobic anchor-tagged thiourea catalyst is highly soluble in less polar solvents compatible to the amino thiourea catalyst-mediated asymmetric reactions, but sparingly soluble in polar solvents used for recycle process. This asymmetric catalyst delivers a catalytic performance comparable to that of a parent catalyst and can be readily recycled from reactions
Spicule Dynamics over Plage Region
We studied spicular jets over a plage area and derived their dynamic
characteristics using Hinode Solar Optical Telescope (SOT) high-resolution
images. The target plage region was near the west limb of the solar disk. This
location permitted us to study the dynamics of spicular jets without the
overlapping effect of spicular structures along the line of sight.
In this work, to increase the ease with which we can identify spicules on the
disk, we applied the image processing method `MadMax' developed by Koutchmy et
al. (1989). It enhances fine, slender structures (like jets), over a diffuse
background. We identified 169 spicules over the target plage. This sample
permits us to derive statistically reliable results regarding spicular
dynamics.
The properties of plage spicules can be summarized as follows: (1) In a plage
area, we clearly identified spicular jet features. (2) They were shorter in
length than the quiet region limb spicules, and followed ballistic motion under
constant deceleration. (3) The majority (80%) of the plage spicules showed the
cycle of rise and retreat, while 10% of them faded out without a complete
retreat phase. (4) The deceleration of the spicule was proportional to the
velocity of ejection (i.e. the initial velocity).Comment: 12 pages, 9 figures, accepted for publication in PAS
Sea Trials for Benthos Sampling Using Autonomous Underwater Vehicle
For enhancement of oceanic engineering technology and researchers, underwater robot competition has been held since 2016. Seventh competition in this year consists AUV league that university\u27s vehicles automatically cruise at field and junior league that underwater craft is made. The paper reports competition regulations of AUV and junior league and results of the competition held in October 2019.The 2020 International Conference on Artificial Life and Robotics (ICAROB 2020), January 13-16, 2020, B-Con Plaza, Beppu, Oit
Lymphoepithelial Carcinoma in the Lateral Tongue: The Case Report
Lymphoepithelial carcinoma (LEC) of the tongue is a rare subtype of squamous cell carcinoma. Histologically, it is an undifferentiated carcinoma with rich lymphocyte and plasma cell infiltration. The most common location for LEC in the head and neck is the salivary glands, and LEC of the oral cavity is extremely rare. The second case report of LEC in the lateral tongue is presented. In addition, a review of the literature was performed, and the relationship between LEC and Epstein-Barr virus infection was considered
Description and Discussion on DCASE 2022 Challenge Task 2: Unsupervised Anomalous Sound Detection for Machine Condition Monitoring Applying Domain Generalization Techniques
We present the task description and discussion on the results of the DCASE
2022 Challenge Task 2: ``Unsupervised anomalous sound detection (ASD) for
machine condition monitoring applying domain generalization techniques''.
Domain shifts are a critical problem for the application of ASD systems.
Because domain shifts can change the acoustic characteristics of data, a model
trained in a source domain performs poorly for a target domain. In DCASE 2021
Challenge Task 2, we organized an ASD task for handling domain shifts. In this
task, it was assumed that the occurrences of domain shifts are known. However,
in practice, the domain of each sample may not be given, and the domain shifts
can occur implicitly. In 2022 Task 2, we focus on domain generalization
techniques that detects anomalies regardless of the domain shifts.
Specifically, the domain of each sample is not given in the test data and only
one threshold is allowed for all domains. Analysis of 81 submissions from 31
teams revealed two remarkable types of domain generalization techniques: 1)
domain-mixing-based approach that obtains generalized representations and 2)
domain-classification-based approach that explicitly or implicitly classifies
different domains to improve detection performance for each domain.Comment: arXiv admin note: substantial text overlap with arXiv:2106.0449
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