Tatsuo Hasegawa

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The use of single crystals has been fundamental to the development of semiconductor microelectronics and solid-state science. Whether based on inorganic or organic materials, the devices that show the highest performance rely on single-crystal interfaces, with their nearly perfect translational symmetry and exceptionally high chemical purity. Attention has(More)
Solution processibility is a unique advantage of organic semiconductors, permitting the low-cost production of flexible electronics under ambient conditions. However, the solution affinity to substrate surfaces remains a serious dilemma; liquid manipulation is more difficult on highly hydrophobic surfaces, but the use of such surfaces is indispensable for(More)
We report on the controlled multiphase thin film growth in the Bi– Fe– O system. By varying the deposition oxygen pressure, the dominant phase formed in the film continuously changes from ferroelectric BiFeO 3 to a mixture of ␣-Fe 2 O 3 and ferromagnetic ␥-Fe 2 O 3. X-ray diffraction and high-resolution transmission electron microscopy have revealed that(More)
For the intensive care of low-birth weight infants, it is important to continuously monitor behavioral changes. From this point of view, we have developed a computer-based monitoring system to analyze the body movements of low-birth weight infants under intensive care. The system consisted of a video recorder with a micro CCD camera for observing infant's(More)
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