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We have directly bonded a laser crystal and a copper block without an indium sheet using the room-temperature-bonding technique to develop more effective and reliable holder structures for high-power solid-state lasers. Moreover, a new structure with a copper foil between a laser crystal and a copper block has been fabricated to realize more cohesive bonding.
Burstiness has been one of the most important criteria for extracting topics and events from documents posted on social media. Recently, researchers are focusing on extracting geolocal topics and events from such social documents because of the increasing number of geo-annotated documents (e.g., Geo-tagged tweets on Twitter). In our previous work, we developed a method for identifying local temporal...
Nowadays with the increasing attention being paid to social media, a huge number of georeferenced documents, which include location information, are posted on social media sites. People transmit and collect information over the Internet through these georeferenced documents, which are usually related to not only personal topics but also local topics and events. Detecting topics and events in georeferenced...
Selenophene 1,1-dioxides are thermally far labile than the corresponding thiophene 1,1-dioxides. Even heavily substituted tetraphenylselenophene 1,1-dioxide (1a) decomposed, by a process not involving cyclodimerization, when heated above its melting point or heated in refluxing toluene. Thus, the thermolysis of 1a in refluxing toluene afforded tetraphenylselenophene (2a, 6%), tetraphenylfuran (3a,...
As the most widely used means to know the charged condition of a lead-acid battery, the method to measure the specific gravity of the electrolyte is adopted. Here we report in this paper on an optical-type sensor taking advantage of the fact that the sulfuric acid electrolyte has a certain definite refractive index in accordance with its specific gravity and the device applying such a principle. Several...
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