Nervous system conveys information by electrical signals called `spikes', therefore, spikes detection and sorting are challenging topics in the neural data processing. The principal component analysis (PCA) is a c...
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Nervous system conveys information by electrical signals called `spikes', therefore, spikes detection and sorting are challenging topics in the neural data processing. The principal component analysis (PCA) is a convenient tool for clustering spikes; however it has some disadvantages for closely shaped and overlapped spikes. For such the cases, an algorithm based on the combination of the principal component analysis and undecimated wavelet transform, is proposed to enhance the cluster formation from the spikes mapping. These results indicate that the principal component analysis used in combination with the undecimated wavelet has a better performance in the spike sorting. This can lead to more compact and separate clusters in comparison with the PCA clustering and more efficient spike sorting.
The symmetry analysis method based on the theory of group representations is used for description of complex systems and their behavior in this work. The first trial of using the symmetry analysis in modeling of behav...
The symmetry analysis method based on the theory of group representations is used for description of complex systems and their behavior in this work. The first trial of using the symmetry analysis in modeling of behavior of complex social system is presented. The evacuation of large building scenarios are discussed as transition from chaotic to ordered states, described as movements of individuals according to fields of displacements, calculated correspondingly to given scenario. The symmetry of the evacuation space is taken into account in calculation of displacements field – the displacements related to every point of this space are presented in the coordinate frame in the best way adapted to given symmetry space group, which is the set of basic vectors of irreducible representation of given symmetry group. The results got with using the symmetry consideration are compared with corresponding results calculated under assumption of shortest way to exits (Voronoi assumption).
This paper deals with a computer-aided distributed design system based on hypergraph grammars and cooperating agents. Hypergraph grammars are used to generate structures of designs in the form of specific graphs allow...
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The (001) face of AIII-BV semiconductors presents a rich surface phase diagram, with several different stoichiometry-dependent reconstructions (surface phases)1. In particular, a c(8x2) reconstruction is observed for ...
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The (001) face of AIII-BV semiconductors presents a rich surface phase diagram, with several different stoichiometry-dependent reconstructions (surface phases)1. In particular, a c(8x2) reconstruction is observed for In(Ga)-rich InSb, InAs and GaAs. The most recent structural model of the reconstruction the so called ζ-model2, is based in the formation of subsurface AIII dimers. Recently, we have shown using scanning tunneling microscopy and frequency-modulated scanning atomic-force microscopy that, at cryogenic temperatures, these surfaces undergo reversible transitions to so far unknown exotic phases with multiple periods, partial disorder and fluctuations3.
After the LHC luminosity upgrade the number of readout channels in the ATLAS Inner Detector will be increased by one order of magnitude and delivering the power to the front-end electronics as well as cooling will bec...
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ISBN:
(纸本)9789290833352
After the LHC luminosity upgrade the number of readout channels in the ATLAS Inner Detector will be increased by one order of magnitude and delivering the power to the front-end electronics as well as cooling will become a critical system issue. Therefore a new solution for powering the readout electronics has to be worked out. Two main approaches for the power distribution are under development, the serial powering of a chain of modules and the parallel powering with a DC-DC conversion stage on the detector. In both cases switched-capacitor converters in the CMOS front-end chips will be used. In the paper we present the design study of a step-up charge pump and a step-down converter. In optimized designs power efficiency of 85 % for the step-up converter and 92 % for the step-down converter has been achieved.
We consider the electron transport through a disordered metallic system, the size of which is less than 100 nm, at least in one dimension. We first present the main ideas of the theoretical description of the electron...
We consider the electron transport through a disordered metallic system, the size of which is less than 100 nm, at least in one dimension. We first present the main ideas of the theoretical description of the electron transport in bulk amorphous metals. Then we indicate the necessary modifications we should introduce to take into account the finite size of the considered sample. Finally, we discuss some examples of metallic nanostructures and calculate their electrical conductivity.
Electron localized in a quantum dot in the vicinity of conductor surface, causes an induced potential to appear. This potential enables self-focusing of electron wave function. Because of this feature, in a planar nan...
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Electron localized in a quantum dot in the vicinity of conductor surface, causes an induced potential to appear. This potential enables self-focusing of electron wave function. Because of this feature, in a planar nanostructure consisting of a quantum well covered with a layer of an insulator, on top of which metal electrodes are deposited, formation of induced dots and quantum wires is possible. By applying appropriate voltages to the electrodes, it is feasible to transport an electron in a fully controllable way in a form of a stable wave packet between two specific locations in a nanodevice. While transporting an electron along properly shaped closed loops, spin-orbit coupling intrinsically present in a semiconductor nanostructure can be employed to perform operations on an electron spin.
The design and the preliminary measurements of a prototype 10 bit pipeline ADC based on 1.5-bit per stage architecture, developed for the luminosity detector at International Linear Collider (ILC) are presented. The A...
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ISBN:
(纸本)9789290833352
The design and the preliminary measurements of a prototype 10 bit pipeline ADC based on 1.5-bit per stage architecture, developed for the luminosity detector at International Linear Collider (ILC) are presented. The ADC is designed in two versions, with and without a sample-and-hold circuit (S/H) at the input. The prototypes are fabricated in 0.35 μm CMOS technology. A dedicated test setup with a fast FPGA based data acquisition system (DAQ) is developed for the ADC testing. The measurements of static (INL, DNL) and dynamic parameters are performed to understand and quantify the circuit performance. The integral (INL) and differential (DNL) nonlinearity are below 1 LSB and 0.5 LSB respectively. The dynamic measurements show signal to noise (SNHR) ratio of about 58 dB for sampling frequency up to 25 MHz.
The norm game (NG) introduced by Robert Axelrod is a convenient frame to disccuss the time evolution of the level of preserving norms in social systems. Recently NG was formulated in terms of a social contagion on a m...
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The problem of spin-dependent transport of electrons through a metallic nanostructure is considered. The system consists of non-magnetic metal wire with two magnetic impurities and is connected to two ferromagnetic le...
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The problem of spin-dependent transport of electrons through a metallic nanostructure is considered. The system consists of non-magnetic metal wire with two magnetic impurities and is connected to two ferromagnetic leads. The differential conductance is calculated by using the transfer matrix method. The spin polarization of the conductance is also obtained. It was found that this polarization is dependent on the spin configuration of magnetic impurities. This dependence can be controlled by the applied bias voltage.
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