摘要:
A travelling-wave tube amplifier comprises a travelling-wave tube, a plurality of collector electrodes, a plurality of collector leads and at least one magnetic core. The travelling-wave tube causes interaction between an electron beam and an input high frequency signal to amplify the high frequency signal, and outputs the amplified high frequency signal. The plurality of the collector electrodes capture the electron beam which was subjected to velocity modulation by the interaction. The plurality of the collector electrodes are electrically connected to a power source via the plurality of the collector leads. The at least one magnetic core comprises a through hole. Any two of the plurality of the collector leads go through the through hole in one of the magnetic cores. Currents flowing through the two collector leads through the through hole in the magnetic core generate magnetic fluxes in the magnetic core. The directions of the generated magnetic fluxes are reversed from each other.
摘要:
A temperature responsive sheet is disclosed that comprises a chemically modified water-soluble elastin obtained by N-acylating at least some of the primary amines and secondary amines contained in a high molecular weight water-soluble elastin molecule and coupling some or all of carboxyl groups contained in the molecule with a glycine alkyl ester. Also is disclosed a process for producing a cell sheet that comprises preparing above the temperature responsive sheet a film that functions as a scaffold for animal cells, culturing specific cells on the film so as to prepare a cell sheet, and subsequently separating the cell sheet and the temperature responsive sheet comprising the chemically modified water-soluble elastin under conditions of no greater than the culturing temperature for the cells.
摘要:
A chemically modified water-soluble elastin that is obtained by subjecting to N-acylating some or all of the primary amines and secondary amines contained in the molecule of a high molecular weight water-soluble elastin and coupling some or all of the carboxyl groups contained in the molecule with the amino group of an amino acid alkyl ester.A chemically modified water-soluble elastin/collagen mixed gel obtained by mixing a collagen with a chemically modified water-soluble elastin that is obtained by subjecting to N-acylating some or all of the primary amines and secondary amines contained in the molecule of a high molecular weight water-soluble elastin and coupling some or all of the carboxyl groups contained in the molecule with the amino group of an amino acid alkyl ester.
摘要:
In a digital PLL circuit outputting a clock signal with a frequency obtained by multiplying a frequency of a reference signal by a frequency command word (a frequency ratio), an RPA serially adds a frequency command word containing a fractional component. An output of the RPA is input to a minute phase error generator. The phase error generator generates a plurality of threshold values close to an actual amplitude value of the reference signal based on the fractional portion of the serially added value of the frequency command word, calculates the amplitude value of the reference signal and a phase error of the reference signal corresponding to the amplitude value based on the threshold values, and calculates a minute phase error between the reference signal and the output clock.
摘要:
A reactor includes a tubular coil and a core. The coil generates magnetic flux when a current is supplied thereto. The core is made of magnetic powder-containing resin, and is arranged to cover the coil. An entire surface of the coil is covered with an insulation coating. The insulation coating has corner portions that cover corner portions of the coil. The corner portions of the coil are formed between two opposing end surfaces (axial end surfaces) of the coil and an inner circumference surface of the coil, and between the two axial end surfaces of the coil and an outer circumference surface of the coil, when viewed in a cross section that is perpendicular to the direction the coil is wound. Each corner portion includes a curved surface portion formed with a circularly curved surface portion having a curvature radius of 0.2 mm or more. A minimum thickness of the corner portion is 0.2 mm or more. The elastic modulus of the core is 5 to 25 GPa.
摘要:
When generating a sampling clock of an A/D converter for digitizing a playback signal from an optical disc, an over sampling clock generated by a PLL is used. Further, zerocross position information and reference information of a playback digital signal that is obtained by A/D conversion using the over sampling clock are converted into those synchronized with the channel bit clock by an operation cycle conversion unit, and then supplied to a PRML signal processing unit and a level judgement binarization unit.
摘要:
In a filter adjustment circuit for an analog filter circuit such as a Gm-C filter, an input signal IS from a reference signal generation circuit 1 is inputted to a Gm-C filter 2 to be filtered and then converted by a conversion circuit 3 to a digital signal. A reference signal RS from the reference signal generation circuit 1 is converted by a conversion circuit 4 to a digital signal. The two converted signals are held in time series in a holding circuit 5. A timing generation circuit 6 generates an update timing signal en based on a reference time-series signal ref from the holding circuit 5. A control signal generation circuit 7 generates a control signal CS based on the reference time-series signal ref and a filter output time-series signal tgt, each from the holding circuit 5. The control signal CS is inputted to the Gm-C filter 2 in response to the update timing signal en to adjust the gain of the Gm-C filter 2. As a result, variations in the response characteristics of the Gm-C filter 2 are adjusted with high accuracy with a simple circuit structure.
摘要:
In an adaptive auto equalizer for automatically amending a signal distorted through propagation in a transmission line to the expected value, each multiplication unit includes a plurality of weight coefficient holding units for storing weight coefficients. The number of these weight coefficient holding units is the same as the clock number which is equal to a delay required for updating the weight coefficients. An adder calculates weight coefficients every clock. The storage location of the calculated weight coefficients is switched by a selector, and the weight coefficients calculated every clock are serially held in a corresponding one of the weight coefficient holding units. The other selectors serially select one of the plurality of weight coefficient holding units and the weight coefficients thus held are given to the multiplication units. Consequently, each of the weight coefficients held in the weight coefficient holding units is given to a corresponding one of the multiplication units in a time period corresponding to the clock number equal to the delay time required for updating the weight coefficients. Thus, even if there is a delay before the update of the weight coefficients, an output error does not diverge, which makes it possible to obtain an ideal output signal in a short time and in a stable manner.
摘要:
A chemically modified water-soluble elastin that is obtained by subjecting to N-acylating some or all of the primary amines and secondary amines contained in the molecule of a high molecular weight water-soluble elastin and coupling some or all of the carboxyl groups contained in the molecule with the amino group of an amino acid alkyl ester.A chemically modified water-soluble elastin/collagen mixed gel obtained by mixing a collagen with a chemically modified water-soluble elastin that is obtained by subjecting to N-acylating some or all of the primary amines and secondary amines contained in the molecule of a high molecular weight water-soluble elastin and coupling some or all of the carboxyl groups contained in the molecule with the amino group of an amino acid alkyl ester.
摘要:
In a digital PLL circuit, a phase comparison circuit counts the numbers of transitions of a reference clock and an oscillation clock, sets a time taken until the number of transitions of the reference clock reaches a reference count value as a phase comparison time period, and detects, as a phase error value, a difference between a target count value, obtained based on a magnification value of a desired oscillating frequency with respect to the frequency of the reference clock and the reference count value, and the number of transitions of the oscillation clock in the phase comparison time period. A smoothing circuit smoothes the phase error value. A digitally-controlled oscillation circuit controls the frequency of the oscillation clock in accordance with the phase error value smoothed by the smoothing circuit.