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    • 1. 发明授权
    • Plasma propulsion apparatus and method
    • 等离子推进装置及方法
    • US4974487A
    • 1990-12-04
    • US252551
    • 1988-10-03
    • Yeshayahu S. A. GoldsteinDerek A. TidmanRodney L. BurtonDennis W. MasseyNiels K. Winsor
    • Yeshayahu S. A. GoldsteinDerek A. TidmanRodney L. BurtonDennis W. MasseyNiels K. Winsor
    • F41B6/00
    • F41B6/00
    • A projectile is accelerated in a barrel bore by applying a plasma jet to a projectile propelling fluid. The plasma jet is derived from a structure forming a capillary passage having a wall formed by a low molecular weight, dielectric powdery filler or water in many rigid containers, shaped as spheres or straw-like tubes having axes parallel to the passage longitudinal axis. The fluid and jet interact so the fluid is heated by the jet, whereby low atomic weight constituents of the fluid are sufficiently heated to become mixed with the plasma to form a high pressure mixture that is injected into the bore to accelerate the projectile. The fluid is dragged into the plasma during mixing to cool the plasma and form a boundary layer between the plasma and the barrel walls so that the mixture does not cause substantial damage to the walls of the bore. The plasma is energized by applying voltage from an electric pulse source to electrodes at opposite ends of the passage. The pulse has a wave shape and duration for initially igniting the plasma source and for thereafter applying energy to the ignited plasma to control the pressure of the mixture. Initially, the fluid cools the plasma without the mixture developing sufficient pressure to accelerate the projectile appreciably. The wave shape and duration are such that the pressure applied to the projectile remains substantially constant while the projectile is being accelerated through the barrel, as occurs during about one-half of the projectile travel time in the barrel.
    • 通过将等离子体射流施加到抛射体推进流体,炮弹在炮筒内加速。 等离子体射流源于形成毛细管通道的结构,该通道具有由许多刚性容器中的低分子量介电粉末填料或水形成的壁,其形状为具有平行于通道纵向轴线的轴的球形或稻草状管。 流体和射流相互作用使得流体被射流加热,由此流体的低原子量组分被充分加热以与等离子体混合以形成注入到孔中的高压混合物以加速射弹。 在混合期间将流体拖入等离子体以冷却等离子体并在等离子体和筒壁之间形成边界层,使得混合物不会对孔的壁造成实质损坏。 通过将来自电脉冲源的电压施加到通道的相对端处的电极来激发等离子体。 脉冲具有用于初始点燃等离子体源的波形和持续时间,并且此后将能量施加到点火等离子体以控制混合物的压力。 最初,流体冷却等离子体,而不会产生足够的压力使混合物明显加速。 波浪形状和持续时间使得当射弹在枪管中的大约一半的射弹行进时间期间发生时,施加到射弹的压力保持基本上恒定,同时射弹被加速通过枪管。
    • 10. 发明授权
    • Superconducting device, apparatus and method for selectively supplying
current to a load
    • 用于选择性地向负载提供电流的超导装置,装置和方法
    • US4897558A
    • 1990-01-30
    • US127927
    • 1987-12-01
    • Derek A. Tidman
    • Derek A. Tidman
    • H03K17/92
    • H03K17/92Y10S505/86
    • A load is selectively supplied with current from an energy storing inductor shunted by a superconducting device. In the normal and superconducting states, the superconducting device respectively has an impedance greater than and much less than that of the load. Circulating current from the inductor flows through the device while it is in a superconducting state. The load is connected to the inductor and superconducting device so that when the device is in the normal state circulating current in the inductor is swtiched to flow from the device through the load. A solenoid wound on the superconducting structure responds to a current source to induce an axial magnetic field in the structure. The axial magnetic field induces in the structure an azimuthal current having sufficient density to change the device from the superconducting to the normal state.
    • 从由超导装置分流的储能电感器选择性地提供负载电流。 在正常和超导状态下,超导装置的阻抗分别大于并远小于负载的阻抗。 来自电感器的循环电流在超导状态下流过器件。 负载连接到电感器和超导装置,使得当器件处于正常状态时,电感器中的循环电流被切换以从器件流过负载。 缠绕在超导结构上的电磁线圈响应电流源以在结构中引起轴向磁场。 轴向磁场在结构中引起具有足够密度的方位电流,以将装置从超导变为正常状态。