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The feasibility of preparing YBaCuO films on metallic substrates is discussed in an attempt to fabricate a superconducting tape. Deposition method employed was an rf magnetron sputtering. An amorphous MgO thin layer was found to be a promising buffer layer. The highest zero resistance temperature was 84.0 K in its as grown state, and a critical current density was 4.8x10 A/cm2 at zero field and 77.4 K. Preliminary experiments using laser ablation technique were also carried out to obtain YBaCuO films at a rather high deposition rate.
We propose more practical method to realize the superfocusing modes based on waveguide structures, and present a numerical analysis these structures using the finite-difference time-domain (FDTD) simulations. For metallic wedged structure coupled to dielectric waveguides, we investigate a method of controlling superfocusing by changing the phase of waveguide modes.
We present the first reported case of primary small cell carcinoma of the lacrimal sac.
A 67-year-old Japanese woman was referred to our department with a two-month history of left medial canthal swelling, epiphora and occasional nasal bleeding. Nasal endoscopy revealed a readily bleeding tumour in the left inferior meatus. Computed tomography and magnetic resonance imaging scans demonstrated that the tumour was mainly located in the left lacrimal sac. Histopathological studies of a biopsy specimen revealed small cell carcinoma. The patient was treated with four cycles of chemotherapy consisting of cisplatin and etoposide, in combination with radiotherapy. There was no evidence of recurrence or metastasis for five years.
Small cell carcinoma originating in the head and neck region has been reported to be highly aggressive and to have a poor prognosis. We report a case of primary small cell carcinoma of the lacrimal sac successfully treated with chemo-radiotherapy.
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