Nihon Dempa Kogyo Co., Ltd.

Riken Corporation

National Institutes for Quantum Science and Technology

Toshiaki Takeuchi

Kozo Ono

Kuichi Kubo

Kunio Hamaguchi

Noritoshi Kimura

Kouichi Moriya

Takuzo Aida

Naoto Inose

Kenichi Sugawara

Daigo Miyajima

Ichio Aoki

Seunghyun Sim

Takaharu Fukushima

Provided is a novel nanoparticle, a contrast agent for magnetic resonance imaging containing the same, and a ligand compound used for production of the nanoparticle. The present invention relates to a nanoparticle including: a metal particle containing iron oxide; and a ligand which is bound to a metal atom on a surface of the metal particle and is represented by formula (3): 

Nanoparticle, contrast agent for magnetic resonance imaging containing same, and ligand compound

A Geiger-Muller counter tube includes a cylindrical enclosing tube, an anode electrode, a cylindrical cathode electrode, an inert gas, and a quenching gas. The cylindrical enclosing tube has a sealed space. The anode electrode is disposed inside the space and formed in a rod shape. The cylindrical cathode electrode surrounds a peripheral area of the anode electrode inside the space to have an opening. The inert gas and the quenching gas are sealed inside the space. At least one of the anode electrode and the cathode electrode includes a plurality of electrodes inside the enclosing tube.

Geiger-Muller counter tube and radiation measurement apparatus

A Geiger-Muller counter tube includes an enclosing tube, an anode conductor, a cathode conductor, an inert gas, and a quenching gas. The enclosing tube is at least partially cylindrical and has a sealed space. The anode conductor includes an anode electrode and a linear first metal lead portion. The anode electrode is arranged inside the space and formed in a rod shape. The first metal lead portion is connected to the anode electrode and supported at an end of the enclosing tube. The cathode conductor includes a cylindrical cathode electrode and a linear second metal lead portion. The cathode electrode surrounds a peripheral area of the anode electrode inside the space. The second metal lead portion is connected to the cathode electrode and supported at the end of the enclosing tube. The cathode electrode has a side surface through a part of which a through-hole passes.

A radiation measurement apparatus for measuring radiation includes a first and second Geiger-Muller counter tubes and a radiation-direction calculating unit. The first Geiger-Muller counter tube seals an electrode within a circular pipe-shaped enclosing tube that extends in a straight line. The first Geiger-Muller counter tube is arranged along a first direction. The second Geiger-Muller counter tube seals an electrode within a circular pipe-shaped enclosing tube that extends in a straight line. The second Geiger-Muller counter tube is arranged in a second direction intersecting with the first direction. The radiation-direction calculating unit is configured to compare a first detection signal and a second detection signal with one another to calculate a direction of radiation to be emitted from the sample. The first detection signal is output from the electrode of the first Geiger-Muller counter tube. The second detection signal is output from the electrode of the second Geiger-Muller counter tube.

Radiation measurement apparatus

Crystal devices are disclosed, of which an exemplary device includes a crystal frame comprising a crystal vibrating piece having an electrode pattern and an outer frame supporting the crystal vibrating piece. The device also includes a crystal package base including at least one connection electrode formed on a first main surface and at least one external electrode formed on a second main surface, wherein the second main surface is opposite the first main surface. The crystal frame and crystal base are layered together with a lid wafer to form a 3-layer sandwich. The layers of the sandwich are bonded together by siloxane bonding, which results in the connection electrodes contacting the electrode pattern on the crystal vibrating piece.

Methods for manufacturing crystal devices

A surface-mount type crystal oscillator includes: a container body with a first recess and a second recess; a crystal blank including excitation electrodes on respective principal surfaces thereof and hermetically encapsulated in the first recess; and an IC chip which is accommodated in the second recess and into which at least an oscillation circuit using the crystal blank is integrated. The container body includes a bottom wall and a frame wall provided on the bottom wall. Two openings which make up the first and second recesses, respectively, are formed in juxtaposition in the frame wall. A pair of inspection terminals are provided in an area of a top surface of the frame wall which surrounds the second recess. The inspection terminals are electrically connected to the excitation electrodes of the crystal blank.

Growing community of inventors

Saitama, Japan

Toshiaki Takeuchi