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    • 32. 发明授权
    • Pulse power generation from thermal quenching of magnetic materials
    • 磁性材料热淬火的脉冲发电
    • US5301362A
    • 1994-04-05
    • US695953
    • 1991-05-06
    • Tihiro Ohkawa
    • Tihiro Ohkawa
    • G01S5/04H04B1/034
    • G01S5/04
    • Generation of a high power rf pulse is achieved in a simple transmitting device that uses permanent magnet material(s) to store energy. Such energy is released through the thermal quenching of the magnetic material(s). Thermal quenching is accomplished, e.g., through an explosion. Such thermal quenching is facilitated in one embodiment by using a magnetic composite material comprising both magnetic particles and explosive particles. The rf pulse thus generated may be used for any desired purpose, e.g., tracking or research. The transmitting device includes a permanent magnet for establishing a constant magnetic flux for so long as the magnet retains its normal magnetic properties. The magnetic flux passes through a coil. Upon the thermal quenching of the magnetic material(s), the magnetic properties rapidly change, causing the magnetic flux to also rapidly change, thus inducing a high power electrical pulse in the coil. This high power electrical pulse may be used in a broad band spark transmitter or used to power a narrow band transmitter, causing the rf pulse to be generated. In one embodiment, the power of the electrical pulse is increased by charging a capacitor, followed by a very short discharge of the capacitor.
    • 在使用永磁材料来存储能量的简单的发送装置中实现高功率射频脉冲的产生。 这种能量通过磁性材料的热淬火而释放。 例如通过爆炸完成热淬火。 通过使用包含磁性颗粒和爆炸性颗粒的磁性复合材料,在一个实施方案中可促进这种热淬火。 由此产生的脉冲频率脉冲可以用于任何期望的目的,例如跟踪或研究。 只要磁体保持其正常的磁特性,发送装置包括用于建立恒定磁通量的永磁体。 磁通量通过线圈。 在磁性材料的热淬火时,磁性能迅速变化,导致磁通量也迅速变化,从而在线圈中产生高功率的电脉冲。 这种高功率电脉冲可以用在宽带火花发射机中,或者用于为窄带发射机供电,从而产生射频脉冲。 在一个实施例中,电脉冲的功率通过对电容器充电而增加,随后是电容器的非常短的放电。
    • 33. 发明授权
    • Ceramic superconductor wire apparatus and methods
    • 陶瓷超导线设备及方法
    • US5026683A
    • 1991-06-25
    • US264324
    • 1988-10-27
    • Tihiro Ohkawa
    • Tihiro Ohkawa
    • C04B35/45H01L39/24
    • C04B35/4508H01L39/247H01L39/248Y10S428/93Y10S505/701Y10S505/702Y10S505/703Y10S505/704Y10T29/49014Y10T428/24917Y10T428/31678
    • A superconducting wire and a process for fabricating such a wire. The present invention relates specifically to the fabrication of a wire using a ceramic superconducting material. Initially, a quantity of highly pure high temperature superconducting material is obtained. The superconducting material may be fabricated by any one of a number of known fabrication methods such as by aqueous coprecipitation, conventional sol gel techniques or solid state reaction processes.Once a ceramic superconducting material in particulate form is obtained, surface impurities on the particles are removed. One such surface cleaning procedure is known as "sputtering." Sputtering strips the surface atoms from the surface of the superconducting material, leaving only pure superconducting ceramic.The superconductive ceramic produced according to the procedure outlined above is then used in the formation of a superconducting wire. There are alternative methods of manufacturing the wire, one of which is to obtain a hollow tube of a conventional conducting material such as gold, silver, copper, or aluminum. The tube is then filled with the cleansed particulate superconducting material.In an alternative embodiment of the present invention, a solid wire is obtained. The superconducting ceramic is then electrostatically coated onto the wire by pulling the wire continuously through an environment of the superconducting ceramic. Particles of the superconducting material are caused electrostatically to adhere to the surface of the wire.
    • 超导线及其制造方法。 本发明具体涉及使用陶瓷超导材料的线的制造。 首先,获得一定量的高纯度高温超导材料。 超导材料可以通过许多已知的制造方法中的任一种制造,例如通过水共沉淀,常规溶胶凝胶技术或固态反应方法。 一旦获得颗粒形式的陶瓷超导材料,就去除颗粒上的表面杂质。 一种这样的表面清洁方法被称为“溅射”。 溅射从超导材料的表面剥离表面原子,仅留下纯超导陶瓷。 然后根据上述方法制备的超导陶瓷用于形成超导线材。 制造线材的替代方法有一种,其中之一是获得诸如金,银,铜或铝的常规导电材料的中空管。 然后用清洁的颗粒超导材料填充管。 在本发明的替代实施例中,获得实线。 然后通过将导线连续地穿过超导陶瓷的环境将超导陶瓷静电涂覆到导线上。 超导材料的颗粒被静电地引入到电线的表面上。
    • 34. 发明授权
    • Laser cooling of electron beam and free electron laser using laser
cooling
    • 使用激光冷却激光冷却电子束和自由电子激光
    • US4688227A
    • 1987-08-18
    • US776395
    • 1985-09-16
    • Vincent S. ChanShiu-Chu ChiuTihiro Ohkawa
    • Vincent S. ChanShiu-Chu ChiuTihiro Ohkawa
    • H01S3/09H01S3/00
    • H01S3/0903
    • A method of cooling an electron beam with electrons having energies in excess of 10 MeV by directing a cooling laser beam over the path of the electron beam so as to achieve Compton scattering interactions, and a device which utilizes this method with other elements to produce a free electron laser system having much greater efficiencies than a single pass free electron laser. This system combines means for producing an electron beam having a narrow energy spectrum in the range above 10 MeV, means for extracting energy from the beam in the form of electromagnetic radiation; means for accelerating the electron beam to replace the energy lost in the extraction means, an optical resonance cavity surrounding the extraction means for producing an output laser from the electromagnetic radiation; electron beam transport means for directing said electron beam in a recirculation loop through the acceleration means and the extraction means; a cooling laser means for generating a cooling laser beam with a laser radiation intensity in excess of 1 times 10.sup.7 V/cm; a laser beam transport means for directing said cooling laser in a reflection path a portion of which is substantially the same as a portion of the electron beam recirculation loop so as to achieve Compton scattering interactions between some of the cooling laser photons and some of the electron beam electrons whereby the Compton scattering interactions reduces the spreading of the energy spectrum of the electron beam caused by the action of the extraction means.
    • 通过将冷却激光束引导到电子束的路径上以实现康普顿散射相互作用的方式,通过使电子具有超过10MeV的能量的电子来冷却电子束,以及利用该方法与其它元件产生 自由电子激光系统比单次无电子激光器具有更大的效率。 该系统组合用于产生具有在10MeV以上范围内的窄能谱的电子束的装置,用于以电磁辐射的形式从光束提取能量的装置; 用于加速电子束以代替在提取装置中损失的能量的装置,围绕提取装置的光学谐振腔,用于从电磁辐射产生输出激光; 电子束传送装置,用于将循环回路中的所述电子束引导通过加速装置和提取装置; 用于产生激光辐射强度超过1×107V / cm的冷却激光束的冷却激光装置; 用于将所述冷却激光器引导到反射路径中的激光束传送装置,其一部分与电子束再循环回路的一部分基本相同,以便实现一些冷却激光光子和一些电子 因此康普顿散射相互作用减小了由于提取装置的作用引起的电子束能谱的扩展。
    • 35. 发明授权
    • Helical field stabilization of plasma devices
    • 等离子体装置的螺旋场稳定
    • US4302284A
    • 1981-11-24
    • US7503
    • 1979-01-29
    • Tihiro Ohkawa
    • Tihiro Ohkawa
    • G21B1/21H05H1/12G21B1/00
    • H05H1/12Y02E30/122Y02E30/126
    • A toroidal plasma device has a toroidal confinement vessel defining a toroidal space and confining ionized gas therein. A solenoid which links the toroidal space induces a toroidal electric field therein to produce plasma current. A plurality of first windings are wound substantially helically around the vessel substantially equally spaced around its minor circumference. A plurality of second windings are wound substantially helically around the vessel substantially midway between successive first windings. Direct current is passed through the respective first and second windings in opposite directions with the current in the respective first and second windings equal or slightly unbalanced. The currents in the first and second windings produce a helical magnetic field. The combination of the poloidal magnetic field from the plasma current with this helical magnetic field produces a separatrix in the toroidal space, this separatrix defining a closed surface which limits and encloses a region within which closed and nested magnetic flux surfaces exist. The sense of rotation of the first and second windings and the direction of the plasma current produces a variation in the safety fractor q with minor radius at any poloidal angle, whereby the sign of q reverses near the outer edge of the plasma, q being an average over a flux surface of the number of transit made around the torus in the toroidal direction by a magnetic flux line in making a single transit in the poloidal direction. The sign of q is determined by the sense of the direction in which the toroidal transit is made.
    • 环形等离子体装置具有限定环形空间并限制其中的电离气体的环形限制容器。 连接环形空间的螺线管在其中引起环形电场以产生等离子体电流。 多个第一绕组围绕容器基本上螺旋地卷绕,围绕其小圆周大致等间隔。 多个第二绕组在连续的第一绕组之间的基本中间大致螺旋地缠绕在容器周围。 直流电流以相反方向通过相应的第一和第二绕组,相应的第一和第二绕组中的电流相等或稍微不平衡。 第一和第二绕组中的电流产生螺旋磁场。 来自等离子体电流的极向磁场与该螺旋磁场的组合在环形空间中产生分离矩阵,该分界线定义了封闭表面,该封闭表面限制并且包围其中存在闭合和嵌套磁通表面的区域。 第一和第二绕组的旋转感和等离子体电流的方向在任何极向角度处产生具有较小半径的安全性分数q的变化,由此q的符号在等离子体的外边缘附近反转,q是 在通过磁通线在环形方向周围环绕的环形通道数量的通量表面上形成在极向方向上单次运输的平均值。 q的符号由环形过渡方向的感觉决定。
    • 39. 发明授权
    • Fiber filled electro-osmotic pump
    • 纤维填充电渗泵
    • US06619925B2
    • 2003-09-16
    • US09972518
    • 2001-10-05
    • Tihiro Ohkawa
    • Tihiro Ohkawa
    • F04F1100
    • F04B17/00F04B19/006
    • An electro-osmotic pump, for transporting aqueous solutions in micro-fluidics, has a tubular-shaped pumping section which includes a pump tube that is connected in fluid communication with an extension tube. A thread of silica fibers is positioned in the lumen of the pump tube, and an aqueous solution that will interact with the thread is introduced into the pump tube lumen to charge the aqueous solution. In operation, a voltage potential is selectively applied between the pump tube and the extension tube to establish a ground-potential-ground electric field along the pumping section. This creates a force on the charged aqueous solution that moves it through the pump tube and, consequently, also moves fluid through the extension tube. Various embodiments of the electro-osmotic pump are envisioned, including the serial connection of several pumping sections, for use as valves, switches or pumps.
    • 用于输送微流体中的水溶液的电渗泵具有管状泵送部分,其包括与延伸管流体连通的泵管。 将二氧化硅纤维的螺纹定位在泵管的内腔中,并且将与螺纹相互作用的水溶液引入泵管腔中以对水溶液进行充电。 在操作中,在泵管和延伸管之间选择性地施加电压电位,以沿着泵送部分建立地电位 - 地电场。 这在带电的水溶液中产生一个力,使其移动通过泵管,并因此也使流体通过延伸管移动。 设想电渗泵的各种实施例,包括用于阀,开关或泵的几个泵送部分的串联连接。
    • 40. 发明授权
    • Ponderomotive force plug for a plasma mass filter
    • 用于等离子体质量过滤器的机车端塞
    • US06576127B1
    • 2003-06-10
    • US10086575
    • 2002-02-28
    • Tihiro Ohkawa
    • Tihiro Ohkawa
    • B03C100
    • H05H1/54
    • A plasma mass filter having features to prevent plasma loss through one end of the filter and thereby increase energy efficiency includes a cylindrical wave guide to surround a plasma. Coil(s) and electrode(s) are provided to establish crossed electric and magnetic fields within the wave guide to separate plasma ions according to their mass. A circularly polarized electromagnetic wave having specific characteristics is launched through a first end of the wave guide and into the plasma to generate ponderomotive forces on the plasma particles via photon reflection. These forces cause the plasma particles to move towards the second end of the wave guide and thus prevent plasma loss through the first end of the wave guide. This structure allows feed plasma to be continuously introduced into the first end of the wave guide for separation therein. A resonance cavity is provided to redirect the reflected photons back into the plasma.
    • 一种等离子体质量过滤器,具有防止通过过滤器一端等离子体损耗从而提高能量效率的特征,包括围绕等离子体的圆柱形波导。 提供线圈和电极以在波导内建立交叉的电场和磁场,以根据其质量分离等离子体离子。 具有特定特性的圆极化电磁波通过波导的第一端发射到等离子体中,以通过光子反射在等离子体颗粒上产生沉积物的力。 这些力导致等离子体颗粒朝向波导的第二端移动,从而防止通过波导的第一端的等离子体损失。 这种结构允许将进料等离子体连续地引入到波导的第一端中以在其中分离。 提供共振腔以将反射的光子重新引导回等离子体。