Abstract: A circuit board assembly includes a wiring board, the lithium secondary battery electrically connected to the wiring board, and a wireless communication device electrically connected to the wiring board. The lithium secondary battery includes a positive electrode, a negative electrode arranged to face the positive electrode, and an electrolyte. In the lithium secondary battery, an electrode area (S) and a battery resistance (R) satisfy a relationship of 0.08?R/S?1.80 (?/cm2), where the electrode area is an area where the positive electrode and the negative electrode face each other.

Abstract: A lithium composite oxide sintered body plate includes a porous structure in which a plurality of primary particles of a lithium composite oxide having a layered rock-salt structure are bonded is included, in which a porosity is 15 to 50%, a ratio of the primary particles whose average inclination angle being an average value of angles between a (003) plane of the plurality of primary particles and a plate surface of the sintered body plate is more than 0° and 30° or less is 60% or more, one or more additive elements selected from Nb, Ti, W are contained, and an addition amount of the one or more additive elements to an entire of the sintered body plate is 0.01 wt % or more and 2.0 wt % or less.

Abstract: A lithium secondary cell includes a positive electrode, a separator, a negative electrode, an electrolytic solution, and a cell case. The positive electrode, the negative electrode, and the separator are impregnated with the electrolytic solution. The cell case is a sheet-like member and convers the positive electrode and the negative electrode from both sides in the direction of superposition. The cell case houses therein the positive electrode, the separator, the negative electrode, and the electrolytic solution. The electrolytic solution contains an electrolytic solution material serving as a base compound and LiDFOB serving as an additive. The moisture content in the electrolytic solution is higher than or equal to 10 ppm by mass and lower than or equal to 15 ppm by mass.

Abstract: A method of manufacturing a ferrous oxide nanoparticle includes a water removing step raising temperature of a solution containing an iron oxide, an organic acid dissolving the iron oxide, and a first solvent to a first temperature and removing water in the solution, a second temperature maintaining step raising the first temperature to a second temperature and maintaining the second temperature, and a particle extracting step extracting the ferrous oxide nanoparticle from the solution after the second temperature maintaining step.

Abstract: According to one embodiment, a photocoupler includes a light emitting element, a light receiving element, a bonding layer, input terminals, output terminals and a molded resin body. A light emitting element includes a transparent support substrate, a semiconductor stacked body, and first and second electrodes. A light receiving element includes a light reception surface, a first electrode, and a second electrode. A bonding layer is configured to bond the first surface of the support substrate to the light reception surface side of the light receiving element. The bonding layer is transparent and insulative. Input terminals are connected to the first and second electrodes of the light emitting element. Output terminals are connected to the first and second electrodes of the light receiving element. The light reception surface is included in the light emitting surface. An input electrical signal is converted into an output electrical signal.

Abstract: A photorelay includes an insulation board, input and output terminals, a die pad portion, a light receiving element, a light emitting element, a MOSFET, and a first sealing resin layer. The insulation board has first and second surfaces. The input terminal includes a first conductive region. The output terminal includes a first conductive region. The light receiving element is bonded on the die pad portion. The light emitting element is bonded on an exposed surface of the light receiving element, and connected to the first conductive region of the input terminal. The MOSFET is connected to the first conductive region of the output terminal. A connecting electrode is included as a part of the input or output terminal. Attachment conductive regions included respectively in the input and output terminals are provided on a side surface of the insulation board as the attachment surface of the photorelay to a wiring substrate.

Abstract: A method of manufacturing a ferrous oxide nanoparticle includes a water removing step raising temperature of a solution containing an iron oxide, an organic acid dissolving the iron oxide, and a first solvent to a first temperature and removing water in the solution, a second temperature maintaining step raising the first temperature to a second temperature and maintaining the second temperature, and a particle extracting step extracting the ferrous oxide nanoparticle from the solution after the second temperature maintaining step.

Abstract: According to one embodiment, a photocoupler includes a light emitting element, a light receiving element, a bonding layer, input terminals, output terminals and a molded resin body. A light emitting element includes a transparent support substrate, a semiconductor stacked body, and first and second electrodes. A light receiving element includes a light reception surface, a first electrode, and a second electrode. A bonding layer is configured to bond the first surface of the support substrate to the light reception surface side of the light receiving element. The bonding layer is transparent and insulative. Input terminals are connected to the first and second electrodes of the light emitting element. Output terminals are connected to the first and second electrodes of the light receiving element. The light reception surface is included in the light emitting surface. An input electrical signal is converted into an output electrical signal.

Abstract: A carbon nanotube production method forms a carbon nanotube aggregate having a high perpendicular orientation characteristic where a plurality of carbon nanotubes are aligned in a direction perpendicular to a surface of a substrate, without using terpineol, which is a viscosity improver. A catalyst solution having a predetermined concentration (from 0.2 M to 0.8 M) of a transition metal salt dissolved therein, and free of terpineol is prepared. Catalyst particles are caused to be present on the surface of the substrate by making the catalyst solution contact with the surface of the substrate. By making a carbon nanotube forming gas contact with the surface of the substrate in a carbon nanotube forming temperature region, the carbon nanotube aggregate is grown on the surface of the substrate where a plurality of carbon nanotubes are aligned in the direction perpendicular to the surface of the substrate.

Abstract: Disclosed are a carbon nanotube composite and a method for making the same advantageous for achieving a higher density of a carbon nanotube assembly. The carbon nanotube composite includes a substrate and a carbon nanotube assembly mounted on the surface of the substrate. The carbon nanotube assembly is composed of multiple carbon nanotubes arranged densely in parallel oriented in the direction upward from the surface of the substrate. The carbon nanotube assembly has a density of 70 mg/cm3 or more in a grown state.

Abstract: In the size measurement of steel sections, a pair of two-dimensional rangefinders and a pair of one-dimensional rangefinders are arranged so as to sandwich a steel section consisting of a pair of flange portions and a web portion in a widthwise direction of the flange portion and face to each other, whereby a vertical distance ranging from the two-dimensional rangefinder to the flange portion and a vertical distance ranging from the one-dimensional rangefinder to the web portion are measured, respectively to calculate a deviation at center, a flange width and a web thickness from the above measured values. In this case, a laser rangefinder is used as each of the two-dimensional rangefinder and one-dimensional rangefinder.