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公开(公告)号：US5811830A
公开(公告)日：1998-09-22
申请号：US482154
申请日：1995-06-08
CPC分类号： B82Y20/00 , G02F1/01708 , G02F1/025
摘要： The present invention is achieved by layering a dielectric slab between a ground plane and a two dimensional quasi quantum well heterostructure and by switching between an unbiased state and a negative potential which is established between the quantum well heterostructure and the ground plane. In the unbiased state, the device supports wave propagation in the dielectric with a phase velocity similar to that of a wave propagating in a parallel plate waveguide. Upon application of the bias voltage, that is establishing a negative potential difference between contacts based on either side of the quantum well heterostructure, the conductivity of the quantum well decreases. Therefore, as the carrier wave propagates the wave interacts with a boundary similar to that of a dielectric-air interface. This new boundary condition, in turn, produces a faster phase velocity. Hence, toggling the bias modulates the quantum well conductivity which changes the phase velocity of the carrier wave.
摘要翻译： 本发明通过在接地平面和二维准量子阱异质结构之间分层电介质板并通过在量子阱异质结构和接地平面之间建立的无偏态和负电位之间切换来实现。 在无偏置状态下，器件支持电介质中的波传播，其相位速度与在平行板波导中传播的波的相位速度相似。 在施加偏置电压时，即基于量子阱异质结构的任一侧建立触点之间的负电位差，量子阱的电导率降低。 因此，当载波传播时，波与与介电 - 空气界面相似的边界相互作用。 这种新的边界条件反过来产生更快的相速度。 因此，切换偏置调制量子阱导电率，其改变载波的相速度。
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公开(公告)号：US5337472A
公开(公告)日：1994-08-16
申请号：US067771
申请日：1993-05-26
IPC分类号： G01R33/383 , H01F7/02 , H01F41/02
CPC分类号： G01R33/383 , H01F7/0278 , Y10T29/49075 , Y10T29/49794 , Y10T29/49796
摘要： Methods of manufacturing rings, cylinders, hemispheres and spheres having aelatively strong central working field. The manufacture of complex magnetic structures is greatly simplified by a method of cutting wedge shaped portions radially into sections, rotating the bonded sections about a radial axis prior to magnetization, magnetizing the sections in a uniform magnetic field, rotating the magnetic sections into their original positions thereby forming the resulting desired permanent magnet structure. In another embodiment, another method of making a hemispherical or spherical magnet structure using rings ground into wedge shaped portions and reassembled is disclosed. In another embodiment, a method of manufacturing a cylindrical quadrupole is disclosed whereby sections of a magic ring are removed and collapsed to form half a cylinder and combined with an analogously collapsed magic ring forming a second half cylinder and combined to form a quadrupole. The methods of the present invention greatly simplify and facilitate the manufacture of complex permanent magnet structures incorporating the so-called "magic" ring principles in the fabrication of a permanent magnet structure having relatively high magnetic fields within a central working space.
摘要翻译： 制造具有较强中心工作场的环，圆柱体，半球和球体的方法。 通过将楔形部分径向切割成部分的方法大大简化了复杂磁性结构的制造，在磁化之前使接合部分围绕径向轴线旋转，在均匀的磁场中磁化部分，将磁性部分旋转到其初始位置 从而形成所需的永磁体结构。 在另一个实施例中，公开了一种制造半球形或球形磁体结构的另一种方法，其使用研磨成楔形部分并重新组装的环。 在另一个实施例中，公开了一种制造圆柱形四极杆的方法，其中魔术环的部分被去除并塌陷以形成半个圆柱体，并与形成第二半圆筒的类似地折叠的魔术环组合并组合以形成四极杆。 本发明的方法大大简化并促进了在制造具有在中心工作空间内具有相对高的磁场的永久磁体结构的结构中引入所谓的“魔术”环原理的复杂永磁体结构。
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