10 research outputs found
Detection of a bright burst from the repeating FRB 20201124A at 2 GHz
We present a detection of a bright burst from FRB 20201124A, which is one of
the most active repeating FRBs, based on S-band observations with the 64-m
radio telescope at the Usuda Deep Space Center/JAXA. This is the first FRB
observed by using a Japanese facility. Our detection at 2 GHz in February 2022
is the highest frequency for this FRB and the fluence of 189 Jy ms is one
of the brightest bursts from this FRB source. We place an upper limit on the
spectral index = -2.14 from the detection of the S band and
non-detection of the X band at the same time. We compare an event rate of the
detected burst with ones of the previous research, and suggest that the
power-law of the luminosity function might be broken at lower fluence, and the
fluences of bright FRBs distribute up to over 2 GHz with the power-law against
frequency. In addition, we show the energy density of the burst detected in
this work was comparable to the bright population of one-off FRBs. We propose
that repeating FRBs can be as bright as one-off FRBs, and only their brightest
bursts could be detected so some of repeating FRBs intrinsically might have
been classified as one-off FRBs.Comment: 8 pages, 5 figures, accepted for publication in Publications of the
Astronomical Society of Japan (PASJ
Distinguishing intrahepatic cholangiocarcinoma from poorly differentiated hepatocellular carcinoma using precontrast and gadoxetic acid-enhanced MRI
PURPOSEWe aimed to gain further insight in magnetic resonance imaging characteristics of mass-forming intrahepatic cholangiocarcinoma (mICC), its enhancement pattern with gadoxetic acid contrast agent, and distinction from poorly differentiated hepatocellular carcinoma (pHCC).METHODSFourteen mICC and 22 pHCC nodules were included in this study. Two observers recorded the tumor shape, intratumoral hemorrhage, fat on chemical shift imaging, signal intensity at the center of the tumor on T2-weighted image, fibrous capsule, enhancement pattern on arterial phase of dynamic study, late enhancement three minutes after contrast injection (dynamic late phase), contrast uptake on hepatobiliary phase, apparent diffusion coefficient, vascular invasion, and intrahepatic metastasis.RESULTSLate enhancement was more common in mICC (n=10, 71%) than in pHCC (n=3, 14%) (P < 0.001). A fat component was observed in 11 pHCC cases (50%) versus none of mICC cases (P = 0.002). Fibrous capsule was observed in 13 pHCC cases (59%) versus none of mICC cases (P < 0.001). On T2-weighted images a hypointense area was seen at the center of the tumor in 43% of mICC (6/14) and 9% of pHCC (2/22) cases (P = 0.018). Other parameters were not significantly different between the two types of nodules.CONCLUSIONThe absence of fat and fibrous capsule, and presence of enhancement at three minutes appear to be most characteristic for mICC and may help its differentiation from pHCC
Correlation-Based Model of Color Picture Watermarking against Random Geometric Distortion
Abstrac
Distinguishing intrahepatic cholangiocarcinoma from poorly differentiated hepatocellular carcinoma using precontrast and gadoxetic acid-enhanced MRI
Optimization and Clinical Feasibility of Free-breathing Diffusion-weighted Imaging of the Liver: Comparison with Respiratory-Triggered Diffusion-weighted Imaging
CyberArts 2002
This publication contains information on the winners of the Prix Ars Electronica for the 2002 Ars Electronica festival. The book's structure follows that of the event, which was divided into five categories: Net Vision and Net Excellence, Interactive Art, Computer Animation and Visual Effects, Digital Musics, and Cybergeneration. Includes texts by jury members introducing each category, and brief statements by selected artists. Biographical notes