878 research outputs found
Solid and Cystic Tumor (SCT) of the Pancreas in an Adult Man
Solid and cystic tumor (SCT) of the pancreas predominantly Occurs in women, and the occurrence in men is extremely rare. We experienced a male case of SCT. A 38-year-old man was admitted with the complaint of upper abdominal pain. CT scan showed the presence of a mass in the head of the pancreas. The mass was composed of high density areas and low density areas. Ultrasonograms revealed the mass being composed of high echoic areas and low echoic areas. The mass .was hypovascular on angiography. SCT was suspected and pancreaticoduodenectomy was performed. The cut surface of the tumor showed mainly cystic degenerative areas containing dark red hemorrhagic materials. Microscopically, there were solid areas in the periphery and pseudopapillary areas in the center. No metastasis was found in the removed lymph nodes. The tumor cells were not stained by Grimelius' silver stain. The tumor cells were positive for alpha-l-antitrypsin (AAT) and neuron-specific enolase (NSE). Pancreatic hormones such as insulin, glucagon, and somatostatin were all negative. Electron micrograph showed that tumor cells were rich in mitochondria. Zymogen granules and neurosecretory granules were not detected. Estrogen receptor (ER) and progesterone receptor (PR) were both negative
Identifying dynamical systems with bifurcations from noisy partial observation
Dynamical systems are used to model a variety of phenomena in which the
bifurcation structure is a fundamental characteristic. Here we propose a
statistical machine-learning approach to derive lowdimensional models that
automatically integrate information in noisy time-series data from partial
observations. The method is tested using artificial data generated from two
cell-cycle control system models that exhibit different bifurcations, and the
learned systems are shown to robustly inherit the bifurcation structure.Comment: 16 pages, 6 figure
Towards the localization of SUSY gauge theory on a curved space
We consider an N=4 supersymmetric gauge theory on a curved space. We try to
generalize Pestun's localization calculation on the four-sphere to a more
general class of curved spaces. We calculated the Q-exact term to localize the
path-integral, and when it becomes positive definite, we obtain a configuration
where the path-integral localizes. We also evaluate the super Yang-Mills action
in this configuration.Comment: 20pages, no figure, typos correcte
Asymptotics and quantization for a mean-field equation of higher order
Given a regular bounded domain , we describe the
limiting behavior of sequences of solutions to the mean field equation of order
, , under the Dirichlet boundary condition and
the bound . We emphasize the connection with the problem of
prescribing the -curvature.Comment: 21 page
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