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公开(公告)号：US5635838A
公开(公告)日：1997-06-03
申请号：US597789
申请日：1996-02-07
IPC分类号： G01R33/3815 , G01R33/3875 , G01R33/20
CPC分类号： G01R33/3815 , G01R33/3875
摘要： A method for operating a superconductive magnet having a superconductor. The magnet is ramped to generally the design current. After that, the magnet is brought to an annealing temperature which is above the operating temperature and below the critical temperature. After that, the magnet is shimmed at a shimming temperature which is at least as cold as the annealing temperature. After that, the magnet is used, at the operating temperature, for a predetermined purpose, such as MRI imaging for medical diagnosis. Preferably, the superconductor has less than twenty-five superconductive filaments.
摘要翻译： 一种用于操作具有超导体的超导磁体的方法。 磁体通常倾斜到设计电流。 之后，使磁体达到高于工作温度并低于临界温度的退火温度。 之后，磁体以至少与退火温度一样冷的匀场温度被调光。 之后，在工作温度下使用磁铁进行预定的目的，例如用于医学诊断的MRI成像。 优选地，超导体具有少于二十五个超导细丝。
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公开(公告)号：US08320427B2
公开(公告)日：2012-11-27
申请号：US12639553
申请日：2009-12-16
摘要： The introduction of spray formed metals into critical applications in the aircraft engine and power generation industries has been hampered by the possibility of erosion of oxide particles from a crucible lining or pouring nozzle in conventional spray forming equipment. These oxide particles may become inclusions that limit low-cycle fatigue life of parts. Use of a cold-walled induction guide (CIG) with an electrical insulation layer between copper CIG elements and the liquid metal offers a means of delivering ceramic-free alloys to a spray system with improved efficiency. CIG design options facilitated by a new oven-brazed fabrication technique resolve induction coil environmental isolation issues, correct thermal strain tolerance problems, facilitate dual frequency induction designs, allow improved electrical coupling efficiency and thermal efficiency, result in improved melt flow initiation, and facilitate disassembly without damage from the solidified melt.
摘要翻译： 喷雾成形金属在飞机发动机和发电行业的关键应用中的引入受到常规喷射成形设备中坩埚衬里或倾倒喷嘴的氧化物颗粒侵蚀的可能性的阻碍。 这些氧化物颗粒可能成为限制部件的低周疲劳寿命的夹杂物。 使用具有铜CIG元件和液态金属之间的电绝缘层的冷壁感应引导件（CIG）提供了一种将无陶瓷合金输送到喷雾系统，提高效率的手段。 CIG设计选项由新的烤箱钎焊制造技术推动，解决感应线圈环境隔离问题，正确的热应变公差问题，促进双频感应设计，允许改进的电耦合效率和热效率，导致改进的熔体流动启动，并便于拆卸 而不会从固化的熔体中损伤。
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公开(公告)号：US5505790A
公开(公告)日：1996-04-09
申请号：US303803
申请日：1994-09-09
申请人： Mark G. Benz , Howard R. Hart, Jr. , Melissa L. Murray , Robert J. Zabala , Bruce A. Knudsen , Thomas R. Raber
发明人： Mark G. Benz , Howard R. Hart, Jr. , Melissa L. Murray , Robert J. Zabala , Bruce A. Knudsen , Thomas R. Raber
CPC分类号： H01L39/14 , Y10S505/918 , Y10S505/927
摘要： A method is described which increases the critical current of triniobium tin by bonding thermal contraction control layers to the triniobium tin superconducting articles at a process temperature to form a composite, and subsequently cooling the composite to a test temperature.
摘要翻译： 描述了一种方法，其通过在热处理温度下将热收缩控制层粘合到三铌锡超导制品上来增加三铌锡的临界电流，以形成复合材料，随后将复合材料冷却至测试温度。
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公开(公告)号：US4107525A
公开(公告)日：1978-08-15
申请号：US729076
申请日：1976-10-04
申请人： Howard R. Hart, Jr.
发明人： Howard R. Hart, Jr.
CPC分类号： G01F1/7042
摘要： A passive flowmeter device is described comprising a conduit for conducting fluid flow therethrough, means located at or near one end of the conduit for introducing fluid flow into the conduit, means located at or near the other end of the conduit for removing fluid flow therefrom and means for detecting the presence in the fluid of quantities of a specific tracer substance, said detecting means being disposed within the conduit intermediate the ends thereof. In one form of the device means are provided in communication with the conduit for introducing therein a preselected tracer substance. The device operates by enabling a comparison between the rate of diffusion of the tracer substance in the given fluid with the rate of flow of the fluid as evidenced by the density gradient of quantities of the tracer substance transported by the fluid.
摘要翻译： 描述了一种被动流量计装置，其包括用于传导流体流过其中的导管，位于导管的一端或附近的装置，用于将流体流引入导管中，位于导管另一端或附近的装置，用于从其中除去流体流， 用于检测流体中存在特定示踪剂物质的量的装置，所述检测装置设置在导管的中间位于其端部的中间。 在装置的一种形式中，提供与导管连通以在其中引入预选的示踪物质。 该装置通过使得在给定流体中的示踪剂物质的扩散速率与流体的流动速率之间的比较来进行操作，如由流体运送的示踪物质的量的密度梯度所证明的。
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公开(公告)号：US4714081A
公开(公告)日：1987-12-22
申请号：US835683
申请日：1986-03-03
IPC分类号： A61B10/00 , A61B5/055 , G01R33/48 , G01R33/563 , A61B5/05
CPC分类号： G01R33/563
摘要： Magnetic field gradient and radio-frequency (RF) pulse signal sequences permitting moving nuclear spins to be selectively detected and then displayed as projected angiographic data in a nuclear magnetic resonance (NMR) image, without the use of contrast agents. The method allows the intensity of an image pixel to be determined by the macroscopic detected spin velocity and can provide essentially complete suppression of non-moving spins. Resulting images have high signal-intensity dynamic range for detected vessels. The selected detection of moving flows is not dependent upon pulsatile flow so that venous and arterial structures are equally as well visualized in high-resolution NMR angiographic images.
摘要翻译： 磁场梯度和射频（RF）脉冲信号序列允许选择性地检测移动的核自旋，然后在核磁共振（NMR）图像中显示为投影的血管造影数据，而不使用造影剂。 该方法允许通过宏观检测的旋转速度确定图像像素的强度，并且可以基本上完全抑制非移动自旋。 所得图像对于检测到的血管具有高信号强度动态范围。 选择的移动流动检测不依赖于脉动流动，因此静脉和动脉结构在高分辨率NMR血管造影图像中同样可视化。
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公开(公告)号：US4689563A
公开(公告)日：1987-08-25
申请号：US743125
申请日：1985-06-10
申请人： Paul A. Bottomley , William A. Edelstein , Howard R. Hart, Jr. , John F. Schenck , Rowland W. Redington , William M. Leue
发明人： Paul A. Bottomley , William A. Edelstein , Howard R. Hart, Jr. , John F. Schenck , Rowland W. Redington , William M. Leue
IPC分类号： G01R33/36 , G01R33/38 , G01R33/485 , G01R33/20
CPC分类号： G01R33/381 , G01R33/3607 , G01R33/485 , G01R33/3815
摘要： A magnetic resonance system for both imaging and spectroscopy of a sample of non-magnetic material (such as a portion of the human anatomy and the like) at one static magnetic field magnitude in excess of 0.7 Tesla (T), utilizes a superconducting magnet having a room-temperature bore of diameter sufficiently large to place therein not only the desired sample but also a set of gradient magnetic field-producing coils and at least one radio-frequency coil for exciting and/or receiving response signals from the sample to be examined. The entire magnetic system has suitably-small temporal and positional field variations to allow imaging to be accomplished at the resonant frequencies of nuclei including .sup.1 H, .sup.13 C, .sup.19 F, .sup.23 Na and .sup.31 P. The system includes a novel interface subsystem, itself including a novel gradient signal switching circuit, for acquiring imaging data in relatively short time intervals.
摘要翻译： 在超过0.7特斯拉（T）的一个静态磁场强度下，用于非磁性材料样品（例如人体解剖结构等的一部分）的成像和光谱学的磁共振系统利用具有 直径足够大的室温孔，不仅放置所需的样品，而且还设置一组梯度磁场产生线圈和至少一个用于激发和/或接收来自待检样品的响应信号的射频线圈 。 整个磁系统具有适当小的时间和位置场变化，以允许在包括1H，13C，19F，23Na和31P的核的共振频率下实现成像。 该系统包括一个新颖的接口子系统，本身包括一个新颖的梯度信号切换电路，用于以较短的时间间隔采集成像数据。
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公开(公告)号：US4197456A
公开(公告)日：1980-04-08
申请号：US921959
申请日：1978-07-05
CPC分类号： E21B47/1015 , G01F1/7042 , G01T7/02
摘要： A passive device particularly for the improved measurement of the flow of a liquid is described. The device comprises a conduit defining a flow volume for the internal transit therethrough of a liquid to be received at one open end thereof and discharged from the other open end thereof; means disposed in communication with the interior of the conduit for introducing a preselected tracer substance into liquid flowing (full channel flow) through the flow volume; at least one enclosure having wall area permeable to the preselected tracer substance, this enclosure being disposed relative to the flow volume so that the liquid flow through the flow volume will contact the permeable wall area, and means disposed within the enclosure for detecting the presence of such preselected tracer substance as may enter the enclosure through the permeable wall area from the interior of the conduit.
摘要翻译： 描述了特别用于改进液体流动测量的被动装置。 该装置包括导管，其限定用于在其一个开口端处接收并从其另一开口端排出的液体的内部转运通道的流量; 与管道内部连通的装置，用于将预先选定的示踪物质引入通过流量的液体流（全通道流）; 至少一个具有可预选示踪物质可渗透的壁面积的外壳，该外壳相对于流动体积设置，使得通过流体积的液体流动将接触渗透壁区域，以及设置在外壳内的装置，用于检测 这种预选的示踪物质可以通过导管内部的可渗透壁区域进入外壳。
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