Abstract:
An image processing apparatus capable of extracting widely viewed features of an entire image and speedily performing image processing, and a method and an information recording medium for such processing. Image data of an original image is obtained by imaging the entire original image with an image pickup unit at a time. An amplitude distribution of a signal is obtained from the image data by fast Fourier transform performed by a fast Fourier transform section of a signal processing unit. An amplitude replacement section replaces the amplitude distribution with a predetermined function using the distance from a center of a frequency plane as a parameter. An inverse fast Fourier transform section forms an image corresponding to the original image by inverse fast Fourier transform from a phase distribution of points obtained by the fast Fourier transform and from an amplitude distribution obtained by the above-described replacement.
Abstract:
An optical and/or electronic device is operated by degeneracy of density of states caused by confinement of electrons in a fractal region having a self-similarity. An AlGaAs/GaAs light emitting device is configured by distributing GaAs quantum dots in a fractal arrangement and confining them in i-type AlGaAs. A single-electron state of the quantum dot array exhibits degeneracy of density of states. Further, a strong quantum chaos is generated to bring about degeneracy of density of states by applying a random magnetic field by addition of a magnetic impurity to the region having a self-similarity.
Abstract:
A method of manufacturing a quantum device such as a coupled quantum boxes device are disclosed. The quantum device comprises: a semiconductor substrate; a plurality of box portions made of a first semiconductor; and a layer made of a second semiconductor provided on circumferences of the box portions, a plurality of quantum boxes being provided with the box portions and the layer of the second semiconductor. The manufacturing method comprises the steps of: making a plurality of box portions of a first semiconductor on a semiconductor substrate; and covering circumferences of the box portions with a layer of a second semiconductor, a plurality of quantum boxes being provided with the box portions and the layer of the second semiconductor.
Abstract:
A fractal structure is formed to have a plurality of regions different in fractal dimension characterizing the self-similarity. The fractal structure is grown from one or more origins under growth conditions providing a first fractal dimension in a first portion of the growth process from the start point of time to a first point of time, and under growth conditions providing a second fractal dimension lower than the first fractal dimension in another portion of the growth process from the first point of time to a second point of time. By adjusting the timing for changing the growth conditions, the fractal structure is controlled in nature of phase transition, such as critical temperature for ferromagnetic phase transition, which occurs in the fractal structure. For enhancing the controllability, the first fractal dimension is preferably larger than 2.7 and the second fractal dimension is preferably smaller than 2.3.
Abstract:
Phase transition is controlled by controlling fractal dimension of a fractal-coupled structure overall or locally. For a magnetic material, ferromagnetic phase transition temperature of magnetic particles arranged to have self-similarity is controlled by fractal dimension. For a half-filled electron system confined in a treelike fractal, Mott transition is controlled by fractal dimension of the system. Stronger quantum chaos than conventional ones is generated by adding magnetic impurities to the fractal-coupled structure, and through this process, Anderson transition is controlled.
Abstract:
An image processing apparatus capable of extracting widely viewed features of an entire image and speedily performing image processing, and a method and an information recording medium for such processing. Image data of an original image is obtained by imaging the entire original image with an image pickup unit at a time. An amplitude distribution of a signal is obtained from the image data by fast Fourier transform performed by a fast Fourier transform section of a signal processing unit. An amplitude replacement section replaces the amplitude distribution with a predetermined function using the distance from a center of a frequency plane as a parameter. An inverse fast Fourier transform section forms an image corresponding to the original image by inverse fast Fourier transform from a phase distribution of points obtained by the fast Fourier transform and from an amplitude distribution obtained by the above-described replacement.
Abstract:
Disclosed is hererin a quantum phase interference transistor comprising: an emitter for emitting electron waves into a vacuum; a gate electrode for controlling the phase difference between a plurality of electron waves; and a collector for collecting the electron waves; characterized in that the gate electrode has the construction of a capacitor.
Abstract:
A nonlinear coupling oscillator array is configured in such a manner that, for example, two layers in each of which a number of quantum dots as oscillators are arranged two-dimensionally are laid one on another. Adjacent quantum dots in the upper layer have tunnel coupling that exhibits a nonlinear current-voltage characteristic. The quantum dots in the upper layer receive an input of initial data/bias current, and each quantum dot in the upper layer is coupled with one quantum dot in the lower layer via a gate function having a time constant. Adjacent quantum dots in the lower layer do not interact with each other and the quantum dots in the lower layer are connected to the ground. For example, initial data are input by generating electron-hole pairs by applying light having an intensity profile corresponding to data, and injecting resulting electrons into the quantum dots of the upper layer. For example, bias current is given by applying light having an intensity profile that is constant temporally and spatially. As time elapses from the input of initial data, there appears a dynamic pattern, that is, a rotating spiral pattern, corresponding to the initial data. The data is stored in this manner.
Abstract:
A collective element of quantum boxes includes a plurality of the first quantum boxes (QD.sub.1) arranged within the first surface, between which conduction of electrons is allowed, a plurality of the second quantum boxes (QD.sub.2) arranged within the second surface corresponding to the plural first quantum boxes (QD.sub.1) between which conduction of electrons and holes is not substantially allowed, and a plurality of the third quantum boxes (QD.sub.3) arranged within the third surface corresponding to the plural second quantum boxes (QD.sub.2), between which conduction of holes is allowed.
Abstract:
A quantum box array comprising a plurality of quantum boxes is made by providing a plurality of box-shaped quantum well portions on a first barrier layer and a second barrier layer covering the quantum well portions. The quantum box array is designed so that interaction energy between electrons or holes is amply larger than transfer energy between the quantum boxes. A control electrode is provided on the second barrier layer to vary the number of electrons or holes in the quantum box array by changing the potential of the control electrode. In spite of using a relatively small number of electrons or holes, the quantum device can suppress fluctuation in density of electrons or holes, can have three or more states, and reduces the power consumption.