Hitachi, Ltd.

Central Japan Railway Company

Michiya Okada

Tsuyoshi Wakuda

Hiroshi Morita

Shigeru Kakugawa

Katsuzou Aihara

Kazuhide Tanaka

Katsuzo Aihara

Kazuo Saitoh

Tomomi Kikuta

Minseok Park

Masaya Takahashi

Kohji Maki

Toshimi Matsumoto

Hideo Tsukamoto

Hiromitsu Seino

Isao Kitagawa

Shuichi Kido

Hisaaki Ochi

Hiroyuki Yamamoto

Tomoo Chiba

Yuzo Fukuda

Keiji Fukushima

Masae Kiryu

Tadaoki Morimoto

Hiroyuki Tanaka

Norihide Saho

Takahiko Kato

Yasuo Suzuki

Hiroshi Satoh

Shinpei Matsuda

Toyotaka Yuasa

Toshiya Doi

Yoshimi Yanai

Mitsuyoshi Tsuchiya

Akira Okayama

Hideki Tanaka

Kenji Kawasaki

Tomoichi Kamo

Hiroyuki Doi

Toshihide Nabatame

Kazumasa Takagi

Motomune Kodama

Hisashi Isogami

Yukio Saito

Hiroyuki Watanabe

Hideki Abe

Yoshihide Wadayama

Haruhiro Hasegawa

Seishin Kirihara

Fumio Iida

Hiroaki Kumakura

Kimihiko Akahori

Hitoshi Kitaguchi

Hideyuki Yamada

Yoshiteru Chiba

Kenichi Usami

Yoshimichi Numata

Shuya Hagiwara

Masazumi Hirakawa

Souji Kajiura

Motoharu Imai

Ryou Nishiwaki

An MgBcompound sheath superconducting wire includes a high stable metal having a specific electric resistance 7 &#x3bc;&#x3a9;cm or below at a room temperature and a high strength metal having a Vickers hardness 50 or above at a room temperature, both of which are assembled therewith to realize a high strength and a lengthy superconductor.

[object Object]

A superconducting circuit including a superconducting joint that joints a niobium titanium superconducting wire having a structure where a filament made of niobium titanium alloy is arranged in a matrix made of copper or copper alloy and other superconducting wire, in which a volume ratio or a surface density of an &#x3b1;-Ti precipitation in the niobium titanium alloy of the filament in the superconducting joint is smaller than the volume ratio or the surface density of the &#x3b1;-Ti precipitation in the niobium titanium alloy of the filament in the niobium titanium superconducting wire in a portion other than the superconducting joint.

Superconducting circuit, production method of superconducting joints, superconducting magnet, and production method of superconducting magnet

An object is to provide a liquid level sensor device for liquefied gas enabling measurement on a liquid level of liquefied gas having a boiling point in the vicinity of 21 K, e.g. liquid hydrogen, accurately and with good reproducibility and enabling simple production with good reproducibility. The present invention is a liquid level sensor device for liquefied gas including compound containing magnesium and boron arranged in succession in the longitudinal direction over the entire or a part of surface of a linear conductor made of metal and a portion of the compound thereof dipped in liquid is in a superconductive state at liquid level measurement.

Liquid level sensor device for liquefied gas

A DDS (direct digital synthesizer) remarkably increased in the number of frequencies which can be output while maintaining the phase coherency, and an NMR instrument using such a DDS are provided. A DDS including phase accumulators and a phase-to-amplitude modulator is provided with a plurality of phase accumulators operating with fixed phase implements which are equal to powers of 2, a controller for outputting each bit of a frequency tuning word as control data, a plurality of switches for outputting an output of an associated one of the phase accumulators when an associated one of the control data supplied from the controller is 1 and outputting 0 when the associated one of the control data is 0, and an adder for adding up outputs of the switches.

Direct digital synthesizer and nuclear magnetic resonance instrument using the same

A persistent current switch in a superconducting magnet, includes: a winding part in which a superconducting wire is noninductively wound; a winding-heating heater provided around the winding part; a vessel provided around the winding part with a space; and an anti-convective material provided in the space between the vessel and the winding part.

Superconducting magnet

An NMR measurement apparatus adopts a circulation flow scheme using a sample solution containing a high molecular compound representing a measuring object and a low molecular compound solution containing a low molecular compound representing a ligand. The measurement apparatus comprises a mixing filterfor mixing the sample solution and the low molecular compound solution, a separation filterfor performing separation therebetween, a flow channelthrough which the sample solution drained out of the separation filteris injected to the mixing filter, a flow channelthrough which the low molecular compound solution drained out of the separation filteris injected to the mixing filter, and a flow channelthrough which the mixture solution drained out of the mixing filteris injected to the separation filterby way of a reservoir

Nuclear magnetic resonance measurement apparatus and measuring method using the same

A probe for nuclear magnetic resonance (NMR) measurement provided with a multiple resonant circuit for detecting signals of two or more nuclides with high detection efficiency for nuclide at low resonant frequency comprises a multiple resonance radio frequency (RF) coil circuit that, with multiple lead lines connected to the RF coil, causes a part of the RF coil, separated by the connection points of the lead lines, to function as the inductor of a trap circuit that cuts off a signal at the frequency Ffor a signal at the resonant frequency Fof a first nuclide and, at the same time, to function as an RF coil that detects a signal at the frequency Ffor a signal at the resonant frequency Fof a second nuclide, thus increasing the signal detection efficiency for the nuclide at the frequency F.

Probe for NMR measurement

An apparatus for nuclear magnetic resonance measurement includes a measurement portion having a magnet for applying a magnetic field to a sample, a bore within the magnet, a nuclear magnetic resonance probe disposed in the bore, and a container for retaining the sample therein; a mixing filter portion for mixing a small molecule solution with a sample solution; a separating filter portion; a small molecule concentration controlling portion; a transmitter/receiver system; a unit for carrying out circulation solution transfer; a unit for injecting the small molecule solution; a unit for controlling the small molecule concentration; a unit for injecting the sample solution; a unit for holding the sample solution in the measurement portion; a unit for discharging the sample solution; and a unit for carrying out nuclear magnetic resonance measurement of the sample solution.

Apparatus of nuclear magnetic resonance measurement by using circulation flow for sample condition control

A magnesium diboride superconducting wire has excellent conduction property and stability. The superconductive connection of the magnesium diboride superconducting wire covered with a superconducting coating layer and a same or different kind of another superconducting wire are connected in a metal tube filled with a solder by way of the superconductive coating layer.

Connecting structure for magnesium diboride superconducting wire and a method of connecting the same

A probe for a nuclear magnetic resonance apparatus comprises: a transmission coil for irradiating a sample with a high-frequency electromagnetic wave; and a receiving coil for detecting a nuclear magnetic resonance signal emitted by the sample, wherein a selector switch is disposed to the transmission coil to reduce the deterioration of sensitivity of the receiving coil by switching the resonance state of the transmission circuit between during irradiation and during detection, even if an electromagnetic coupling remains between transmission and reception.

Probe configured for NMR apparatus and NMR apparatus using the same

There is disclosed a permanent current switch which has a high temperature margin and which is thermally stable and which securely performs a switching operation between a superconducting state and a normal conducting state. The permanent current switch of the present invention has a coiled superconducting wire and a heater wire which switches the superconducting wire between the superconducting state and the normal conducting state, the superconducting wire is a magnesium diboride superconducting wire having a high-resistance metal on an outer side and a magnesium diboride superconducting portion on an inner side and prepared by forming a superconducting metal on a layer between the high-resistance metal and the magnesium diboride superconducting portion, and the permanent current switch further comprises a superconductive connecting section superconductively connected to a lead wire guided from the superconducting wire and a superconducting wire for a wiring line.

Permanent current switch

In a metal sheath MgBsuperconducting wire, it is intended to achieve a wire having increased current density and a long length at the same time, by densitying superconducting core part. The superconducting wire is manufactured by forming diffusion hardened layer on the inner surface of the sheath such that the hardness of the inner surface becomes higher than that of the outer surface, filling MgBsuperconductor, and further if necessary, a critical current density increasing material such as indium, copper, and tin, in a metal sheath, to subject it to wire drawing. For the metal sheath, a material with toughness such as steel is used. Even if the sheath is made to a long wire, it does not break, thereby, enabling to density superconducting core part.

Metal sheath magnesium diboride superconducting wire and its manufacturing method

A NMR apparatus includes a probe coil of a superconductor coil made of magnesium 2-boride formed on a surface of a substrate, and a coil bobbin around which the superconductor coil is wound. The substrate is made of a flexible organic material that contains no hydrogen atoms.

Superconductor probe coil for NMR apparatus

In an NMR apparatus provided with a split type magnet, in order to position a probe at a high precision in a narrow homogeneous magnetic field space, a positioning of a center of a probe coil is first located to a proper position by inserting an NMR probe from a horizontal bore. At this position, a sample tube is inserted from a vertical bore, and an NMR signal is measured from the probe coil. An NMR signal measuring apparatus amplifies the NMR signal from the probe coil, and executes an A/D conversion so as to determine an NMR spectrum signal, and an NMR signal analyzing apparatus compares the NMR spectrum signal. A probe is set at a position where a sharpness of the spectrum is largest, that is, a magnetic field homogeneity coefficient is high, by repeating the operations mentioned above.

NMR system and probe positioning method

The present invention makes it possible to measure a plurality of samples under a certain concentration condition of the small molecule by the circulation transfer of a small molecule solution through a small molecule concentration control portion for injecting, discharging or feeding the small molecule solution, a mixing filter portion for mixing a solution (sample) containing the large molecule sample with the small molecule solution, a container set in a nuclear magnetic resonance probe, a separating filter portion for separating the mixture into the sample and the small molecule solution, and the small molecule concentration control portion; injecting the sample from the mixing filter portion; holding the sample in a measurement portion in the container; and discharging the sample from the separating filter portion after completion of the NMR measurement.

Growing community of inventors

Mito, Japan

Michiya Okada