A prototype of super-synthesis radiometer for field imaging experiments Komiyama, K.; Shioya, R.; Morioka, T. ...
IGARSS 2000. IEEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings (Cat. No.00CH37120),
2000, Volume:
2
Conference Proceeding
The authors made a prototype interferometric radiometer for field experiments of supers-synthesis imaging. The radiometer has 17 interferometers, which can receive the radiation from the ground in ...the band of 6.6 GHz. The multiple interferometers are aligned across the track for getting 2-dimensional images. It is also used as an ordinary multiple interferometers. The radiometer has a calibration circuit composed of a noise source, a signal divider and RF switches. The configuration and function of the radiometer system and the methods of field experiment and calibration are described.
We study interleaved core assignment for bidirectional transmission in multi-core fibers. By combining it with heterogeneous core structure in an 18-core fiber, the transmission distance is extended ...by 10 times compared to homogeneous core structure with unidirectional transmission, achieving a total capacity of 1 Pb/s per direction.
Magnetoencephalographic (MEG) activities were recorded in five patients with cerebral arteriovenous malformation (AVM) who presented with epilepsy and no clinical history of intracranial hemorrhage, ...using a 37-channel DC superconducting quantum interference device (SQUID) system. While scalp-recorded electroencephalograms (EEG) failed to reveal paroxysmal discharge, MEGs demonstrated localized high frequency magnetic activity (HFMA). Magnetic source imaging (MSI) depicted the accumulation of equivalent current dipole (ECD) originating from HFMA around the nidus, and the ECD localization agreed well with spike localization on intraoperative electrocorticography (ECoG). These areas corresponded with the areas of hypoperfusion on single photon emission tomography and the intraoperative laser Doppler flow meter. We discussed the application of MEG in estimating interictal paroxysmal activity sources in patients with AVM and addressed the questions of its reliability and validity in source localization.
For successful surgical treatment of intractable epilepsy, identification of the epileptogenic area and functional cortex, by using the intracranial electrodes such as subdural and depth electrodes, ...is important. Since 1994, via chronic subdural electrodes recording, we performed anterior temporal lobectomy with hippocampectomy for 18 patients with temporal lobe epilepsy. For 10 patients with extratemporal lobe epilepsy, cortical resection of the epileptogenic cortex was performed. For the epileptogenic cortex overlapping with functional area, we added the multiple subpial transection. Favorable postoperative seizure outcome was obtained in most of the patients. Although non-invasive presurgical evaluation modalities such as MRI, video-EEG monitoring, MEG, and FDG-PET are useful in the diagnosis of epilepsy, it is impossible to localize precisely the exact epileptogenic zone and functional cortex.
We experienced an extremely rare tumor in the female urethral orifice in a 57‐year‐old Japanese woman. To our knowledge, only two cases of primary urethral carcinoid tumor have been reported. The ...previous reports of urethral carcinoid tumor were recognized in the male middle urethra and penile urethra. The present case was resected, and diagnosed as a carcinoid tumor by histological, immunohistochemical and ultrastructural findings. The tumor cells were stained by chromogranin A, synaptophsin and neuron‐specific enolase, and neurosecretory granules were confirmed with electron microscopy. The patient did not complain of any symptoms until 5 years after the resection of the tumor. Therefore, the case we describe here is the first known report of carcinoid tumor in the Japanese female urethra.
Nerve cell tumours of the cerebrum tend to display a high degree of morphological variability from case to case, and this leads to poor understanding of these tumours. We retrospectively reviewed the ...clinical and patho-anatomic features of 16 primary nerve cell tumours of the cerebrum (M:9; F:7; average age at onset: 10.2 years). Intraventricular tumours were not included. In 13 patients epileptic seizures were the only symptoms, while three had headache or hemiparesis. Seven tumours were located in the frontal lobe, four in the parietal lobe, two in the temporal lobe and one each in the fronto-parietal lobes, occipital lobe and the midbrain. Tumours were histologically classified into three groups. In the first group, six tumours had the morphological features of classic gangliocytoma or ganglioglioma. In the second group six cerebral and midbrain tumours were composed of small cells, which showed apparent neuronal differentiation including positive immunoreactivity for synaptophysin and the presence of synaptic structures. These tumours u sually involved both the cortex and white matter. In the third group, three tumours were composed of small nerve cells and ganglioid cells. All tumours were relatively well circumscribed, and thus eight tumours were totally removed, five subtotally and three partially. Following surgery, three patients, except one, are alive with stable imaging findings for 4 months - 19.3 years (average 11.6 years) after treatment. While small nerve cell tumours are found throughout the cerebrum and its identification broadens the spectrum of neuronal and mixed neuro-glial tumours, most of these tumours are biologically indolent.
107.1 and 93.9-Gbps net-rate (gross-rate 133.9 and 101.3-Gbps) OFDM transmission on a 408-GHz carrier frequency is experimentally demonstrated over a joint fibre-wireless link, 51-km single-mode ...fibre and 10.7-m free-space, with bit-error rates below the 20% soft- and 7% hard-decision FEC thresholds of 2.7×10-2 and 3.8×10-3, respectively.
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