公开(公告)号：US4950381A

公开(公告)日：1990-08-21

申请号：US205277

申请日：1988-06-10

Applicant: Hiroyuki Takeuchi ,  Kaneo Noake ,  Tamio Serita

Inventor： Hiroyuki Takeuchi ,  Kaneo Noake ,  Tamio Serita

IPC: C04B35/571 ,  C04B35/589 ,  C08G77/48 ,  C08G77/62

CPC classification number: C04B35/589 ,  C04B35/571 ,  C08G77/62

Abstract: There is provided a new polysilazane product from a specific precursor. Desired molecular weight of the polysilazane can be obtained by selecting the proper molar ratio of R.sub.1 SiHX.sub.2 and R.sub.2 R.sub.3 SiX.sub.2 as raw materials. The polysilazane is stable during storage without gelation. The polymerization of the precursor can be carried out without gelation even at a high temperature and hence can be completed in a short time. The polysilazane can be made into ceramic fibers by spinning from a solution and subsequent firing.

公开(公告)号：US4929881A

公开(公告)日：1990-05-29

申请号：US356423

申请日：1989-05-25

Applicant: Masao Yabusaki ,  Etsuji Yamamoto ,  Hiroyuki Takeuchi ,  Hideki Kohno

Inventor： Masao Yabusaki ,  Etsuji Yamamoto ,  Hiroyuki Takeuchi ,  Hideki Kohno

IPC: A61B10/00 ,  A61B5/055 ,  G01R33/34 ,  G01R33/36

CPC classification number: G01R33/34046 ,  G01R33/3628 ,  G01R33/3657

Abstract: There is provided a probe to detect a nuclear magnetic resonance signal in which each of a plurality of arms forming a current path of an Alderman-Grant type coil is divided into two conductor plates, the two conductor plates are connected by an inductor, and a resonance frequency is reduced by increasing the inductance of the current path.

Abstract translation: 提供了一种用于检测核磁共振信号的探针，其中形成Alderman-Grant型线圈的电流路径的多个臂中的每一个被分成两个导体板，两个导体板通过电感器连接， 通过增加电流路径的电感来减小谐振频率。

公开(公告)号：US4725660A

公开(公告)日：1988-02-16

申请号：US868039

申请日：1986-05-29

Applicant: Tamio Serita ,  Hiroyuki Takeuchi

Inventor： Tamio Serita ,  Hiroyuki Takeuchi

IPC: C08G77/48 ,  C04B35/584 ,  C04B35/589 ,  C08G77/00 ,  C08G77/62 ,  C08G77/04

CPC classification number: C04B35/589 ,  C08G77/62

Abstract: A method which comprises reacting an aminosilane compound with an excessive amount of ammonia or primary amine under conditions which produce a polysilazane.

Abstract translation: 一种方法，其包括在产生聚硅氮烷的条件下使氨基硅烷化合物与过量的氨或伯胺反应。

公开(公告)号：US09618592B2

公开(公告)日：2017-04-11

申请号：US14237190

申请日：2012-08-10

Applicant: Takeshi Kawamura ,  Yukinobu Imamura ,  Mitsushi Abe ,  Takuro Honda ,  Hiroyuki Takeuchi

Inventor： Takeshi Kawamura ,  Yukinobu Imamura ,  Mitsushi Abe ,  Takuro Honda ,  Hiroyuki Takeuchi

IPC: G01V3/00 ,  G01R33/389 ,  G01R33/385 ,  G01R33/565 ,  G01R33/421

CPC classification number: G01R33/389 ,  G01R33/3854 ,  G01R33/4215 ,  G01R33/56518

Abstract: A device includes: a static magnetic field generating device including static magnetic field generating sources generating a homogeneous magnetic field in a space; gradient magnetic field generating sources superimposing a gradient magnetic field on the homogeneous magnetic field, and conductor rings arranged between the static magnetic field generating sources and the gradient magnetic field generating sources in a pair of arranging regions on both sides in a direction of the homogeneous magnetic field in a region where the homogeneous magnetic field is generated (imaging region), respectively, the conductor rings being separated from each other and making a pair. The conductor rings are mechanically connected to the gradient magnetic field generating device or the static magnetic field generating device. This provides an MRI device 1 capable of reduction in vibration with suppression of the image quality deterioration of the tomographic images.

公开(公告)号：US09599685B2

公开(公告)日：2017-03-21

申请号：US13877702

申请日：2011-10-06

Applicant: Hideta Habara ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Yoshihisa Soutome ,  Masayoshi Dohata ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

Inventor： Hideta Habara ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Yoshihisa Soutome ,  Masayoshi Dohata ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

IPC: G01R33/34 ,  G01R33/345 ,  H01Q9/06 ,  H01Q21/20 ,  G01R33/28 ,  G01R33/36 ,  G01R33/422

CPC classification number: G01R33/34092 ,  G01R33/288 ,  G01R33/34046 ,  G01R33/3456 ,  G01R33/3657 ,  G01R33/422 ,  H01Q9/065 ,  H01Q21/20

Abstract: There is provided a technique for suppressing increase of SAR without sacrificing sensitivity in RF coils used in MRI apparatuses. The present invention provides an antenna device comprising a sheet-shaped conductor and a ribbon-shaped conductor disposed on the subject side with respect to the sheet-shaped conductor with a predetermined distance from the sheet-shaped conductor. The ribbon-shaped conductor has a meandering shape, and is adjusted so as to resonate at transmission and reception frequencies, and it is constituted so that distance to the sheet-shaped conductor becomes smaller at both end part thereof along the static magnetic field direction compared with the distance to the sheet-shaped conductor at the center thereof. Moreover, the ribbon-shaped conductor is constituted so as to have a smaller width, as the distance to the sheet-shaped conductor becomes smaller.

公开(公告)号：US09541617B2

公开(公告)日：2017-01-10

申请号：US13979542

申请日：2012-01-13

Applicant: Masanao Terada ,  Mitsushi Abe ,  Yukinobu Imamura ,  Hiroyuki Takeuchi ,  Akira Kurome

Inventor： Masanao Terada ,  Mitsushi Abe ,  Yukinobu Imamura ,  Hiroyuki Takeuchi ,  Akira Kurome

IPC: G01R33/385 ,  G01R33/421

CPC classification number: G01R33/385 ,  G01R33/4215

Abstract: A gradient coil device includes a major axis gradient coil, having an ellipse in a cross section generating a gradient magnetic field inclined in a major axis direction of the ellipse at a magnetic field space; and a minor axis gradient coil, having an ellipse in a cross section generating a gradient magnetic field inclined in a minor axis direction of the ellipse at the magnetic field space. A length of the minor axis field coil in the center axis direction is shorter than a length of the major axis gradient coil in the center axis direction. A maximum value of a residual magnetic field generated by the minor axis gradient coil at a space outside the magnetic field space is equal to or smaller than a maximum value of a residual magnetic field generated by the major axis gradient coil at a space outside the magnetic field space.

Abstract translation: 梯度线圈装置包括长轴梯度线圈，在截面上具有椭圆形状，在磁场空间产生沿椭圆的长轴方向倾斜的梯度磁场; 以及短轴倾斜线圈，在截面中具有椭圆形状，在磁场空间产生在椭圆的短轴方向上倾斜的倾斜磁场。 短轴励磁线圈的中心轴方向的长度比中心轴方向的长轴梯度线圈的长度短。 在磁场空间外的空间处由短轴梯度线圈产生的剩余磁场的最大值等于或小于在磁性空间外的空间处由长轴梯度线圈产生的残余磁场的最大值 场地空间。

公开(公告)号：US09297876B2

公开(公告)日：2016-03-29

申请号：US13377275

申请日：2010-06-04

Applicant: Akiko Kaneta ,  Hiroyuki Takeuchi ,  Shouichi Miyawaki

Inventor： Akiko Kaneta ,  Hiroyuki Takeuchi ,  Shouichi Miyawaki

IPC: G01R33/58 ,  G01R33/38 ,  G01R33/565

CPC classification number: G01R33/56518

Abstract: An object is to correct a magnetic field caused by an eddy current, which is generated due to application of a gradient magnetic field, not only in the application direction of the gradient magnetic field but also in a direction different from the application direction of the gradient magnetic field. In the present invention, in order to achieve this object, a compensation magnetic field which compensates for an eddy current magnetic field generated in each of an application direction of a test gradient magnetic field and a direction different from the application direction in each direction is calculated using the test gradient magnetic field. When generating an arbitrary gradient magnetic field, a compensation magnetic field which compensates for an eddy current magnetic field according to application of an arbitrary gradient magnetic field on the basis of the measured eddy current magnetic field in each direction is generated together with the arbitrary gradient magnetic field.

Abstract translation: 目的是校正由于施加梯度磁场而产生的涡流引起的磁场，不仅在梯度磁场的施加方向上，而且在与梯度的施加方向不同的方向上 磁场。 在本发明中，为了达到上述目的，计算出补偿磁场，该补偿磁场补偿在测试梯度磁场的施加方向和与各方向上的施加方向不同的方向中的每一方产生的涡流磁场 使用测试梯度磁场。 当产生任意梯度磁场时，根据任意梯度磁场的应用，根据在每个方向上测量的涡流磁场来补偿涡流磁场的补偿磁场与任意梯度磁场一起产生 领域。

公开(公告)号：US08983810B2

公开(公告)日：2015-03-17

申请号：US13542911

申请日：2012-07-06

Applicant: Yutaka Takeuchi ,  Hiroyuki Takeuchi ,  Kazuki Yano

Inventor： Yutaka Takeuchi ,  Hiroyuki Takeuchi ,  Kazuki Yano

IPC: G06F17/50 ,  G21D3/00 ,  G21C17/00 ,  G21C17/108

CPC classification number: G21C17/00 ,  G21C17/108 ,  G21D3/001 ,  G21D2003/005 ,  Y02E30/39

Abstract: An apparatus for monitoring nuclear thermal hydraulic stability of a nuclear reactor, contains: a calculation unit configured to calculate a stability index of a nuclear thermal hydraulic phenomenon based on nuclear instrumentation signals, the signals being outputted by a plurality of nuclear instrumentation detectors placed at regular intervals in a reactor core; a simulation unit configured to simulate the nuclear thermal hydraulic phenomenon based on a physical model by using information on an operating state of the nuclear reactor as an input condition; a limit value updating unit configured to update a limit value of the nuclear thermal hydraulic phenomenon based on a result of the simulation; and a determination unit configured to determine, based on the stability index and the limit value, whether or not to activate a power oscillation suppressing device.

Abstract translation: 一种用于监测核反应堆的核热液压稳定性的装置，包括：计算单元，被配置为基于核仪表信号计算核热液压现象的稳定性指标，所述信号由放置在规则的多个核仪器检测器输出 反应堆核心间隔; 模拟单元，被配置为通过使用关于核反应堆的操作状态的信息作为输入条件来模拟基于物理模型的核热液压现象; 限制值更新单元，被配置为基于模拟结果来更新核热液压现象的极限值; 以及确定单元，其被配置为基于所述稳定性指标和所述极限值来确定是否激活功率振荡抑制装置。

公开(公告)号：US20140253126A1

公开(公告)日：2014-09-11

申请号：US14349424

申请日：2012-10-17

Applicant: Hideta Habara ,  Yoshihisa Soutome ,  Hiroyuki Takeuchi ,  Hisaaki Ochi

Inventor： Hideta Habara ,  Yoshihisa Soutome ,  Hiroyuki Takeuchi ,  Hisaaki Ochi

IPC: G01R33/34

CPC classification number: G01R33/34092 ,  G01R33/3415 ,  G01R33/3453 ,  G01R33/36 ,  G01R33/365

Abstract: In order to provide a technique which can suppress coupling to homogenize the spatial distribution of an RF magnetic field and can improve penetration of the RF magnetic field into the subject, pad-like electric field conductors having a predetermined area are provided outside both ends of a rung conductor as a part of a configuration which forms a loop-like circuit and is driven as an antenna. An antenna device includes a sheet-like conductor, a rung conductor which is arranged at a predetermined distance from the sheet-like conductor, two electric field conductors which are arranged in both end portions of the rung conductor at a predetermined distance from the sheet-like conductor, and connection terminals which are transmission and reception terminals provided in the rung conductor and the sheet-like conductor. The rung conductor and the sheet-like conductor configure a loop circuit which resonates at a preset frequency.

Abstract translation: 为了提供可以抑制耦合以均匀化RF磁场的空间分布并且可以改善RF磁场对被摄体的穿透的技术，具有预定面积的垫状电场导体设置在 梯形导体作为形成环状电路并被驱动为天线的配置的一部分。 天线装置包括片状导体，布置在与片状导体预定距离的梯形导体，两个电场导体，布置在与片状导体预定距离的梯形导体的两个端部中， 以及设置在梯形导体和片状导体中的发送和接收端子的连接端子。 梯形导体和片状导体构成以预设频率谐振的环路电路。

公开(公告)号：US20140210476A1

公开(公告)日：2014-07-31

申请号：US14237190

申请日：2012-08-10

Applicant: Takeshi Kawamura ,  Yukinobu Imamura ,  Mitsushi Abe ,  Takuro Honda ,  Hiroyuki Takeuchi

Inventor： Takeshi Kawamura ,  Yukinobu Imamura ,  Mitsushi Abe ,  Takuro Honda ,  Hiroyuki Takeuchi

IPC: G01R33/389

CPC classification number: G01R33/389 ,  G01R33/3854 ,  G01R33/4215 ,  G01R33/56518

Abstract: A device includes: a static magnetic field generating device including static magnetic field generating sources generating a homogeneous magnetic field in a space; gradient magnetic field generating sources superimposing a gradient magnetic field on the homogeneous magnetic field, and conductor rings arranged between the static magnetic field generating sources and the gradient magnetic field generating sources in a pair of arranging regions on both sides in a direction of the homogeneous magnetic field in a region where the homogeneous magnetic field is generated (imaging region), respectively, the conductor rings being separated from each other and making a pair. The conductor rings are mechanically connected to the gradient magnetic field generating device or the static magnetic field generating device. This provides an MRI device 1 capable of reduction in vibration with suppression of the image quality deterioration of the tomographic images.

Abstract translation: 一种装置包括：静态磁场产生装置，其包括在空间中产生均匀磁场的静态磁场产生源; 在均匀磁场上叠加梯度磁场的梯度磁场产生源和在均匀磁场的方向上的两侧的一对排列区域中布置在静态磁场产生源和梯度磁场产生源之间的导体环 （成像区域）的区域中，导体环彼此分离并形成一对。 导体环与梯度磁场产生装置或静磁场产生装置机械连接。 这提供了能够通过抑制断层图像的图像质量劣化来减少振动的MRI装置1。