Abstract: A design assisting system is constructed as a CAD (computer-aided design) system for assisting in designing printed-circuit boards or other electronic devices. The system makes it possible to design layouts for reducing an unwanted electromagnetic radiation due to a common-mode current. The system has a first tool for converting at least a set of an electronic device, an interconnection, and a ground plane from layout information of a circuit board into a model for analyzing an electromagnetic field, a second tool for specifying a frequency and calculating a magnetic field intensity distribution near the ground plane using the model, and a third tool for superposing the calculated magnetic field intensity distribution and the position of the interconnection, determining whether a position where a magnetic field or a current is strong and the position of the interconnection are close to each other or not, and outputting a determined result.

Abstract: A nickel hydroxide positive active material for an alkaline battery contains nickel hydroxide powder having a nickel valence of greater than 2; and a cobalt compound having a cobalt valence of greater than 2, which is formed on the surface of said nickel hydroxide powder. For example, the surface of nickel oxyhydroxide powder is covered by cobalt oxyhydroxide layer. This positive active material is used as a starting material to produce an electrode by retaining it in a three-dimensional porous material.

Abstract: A printed-circuit board characteristic evaluation system is basically configured by an input device, a data processing device, a storage device and an output device. Herein, the input device inputs layout information representing an overall layout of a printed-circuit board installing at least one active component, from which layout information data regarding a power supply circuit is extracted and is stored in the storage device. The layout information data is converted to electric circuit information representing an equivalent circuit model with respect to a selected side of the printed-circuit board. Then, calculations are performed based on the layout information data to produce impedance characteristics with respect to the power supply circuit. A decision is made as to whether resonance is caused to occur in the power supply circuit on the basis of results of comparison of the impedance characteristics. The output device outputs the impedance characteristics as well as resonance information.

Abstract: A PCB (Printed Circuit Board) design support system and a PCB design method reduce radiation of electromagnetic waves by optimizing layout of a substrate while following a conventional method for designing a PCB and maintaining a conventional structure. The PCB design support system includes an input information section for a ground plane structure, power plane structure and layout of a PCB, a circuit model section for calculating voltages between the ground plane and power plane and distribution of currents flowing on the ground plane and power plane using input information, a frequency selection section and a section to display obtained voltage and current distribution in a form of two-dimensional voltage and current distribution maps corresponding to shapes of the PCB. The PCB design support system enables a via-hole disposed between planes and/or wiring installed between planes causing variations in voltages to be specified in a precautionary manner from a PCB design stage.

Abstract: A printed-circuit board characteristic evaluation system is basically configured by an input device, a data processing device, a storage device and an output device. Herein, the input device inputs layout information representing an overall layout of a printed-circuit board installing at least one active component, from which layout information data regarding a power supply circuit is extracted and is stored in the storage device. The layout information data is converted to electric circuit information representing an equivalent circuit model with respect to a selected side of the printed-circuit board. Then, calculations are performed based on the layout information data to produce impedance characteristics with respect to the power supply circuit. A decision is made as to whether resonance is caused to occur in the power supply circuit on the basis of results of comparison of the impedance characteristics. The output device outputs the impedance characteristics as well as resonance information.

Abstract: The present invention relates to a polyolefin stretch packaging film, comprising at least one layer containing a component (A), and which has a storage modulus (E′) of from 5.0×108 dyn/cm2 to 5.0×109 dyn/cm2 and a loss tangent (tan&dgr;) of from 0.2 to 0.8, as measured by dynamic viscoelasticity measurement at a frequency of 10 Hz and at a temperature of 20° C., wherein said component (A) is a soft polypropylene resin which satisfies the following conditions (1) to (3), which has a sum of mesopentad percentage and racemopentad percentage (mmmm+rrrr) of from 30 to 70% as obtained from 13C-NMR spectrum, in which crystalline block and non-crystalline block portions co-exist in the molecular chain and of which the stereoregularity is controlled.

Abstract: In a printed circuit board design support apparatus for supporting design of a printed circuit board by calculating a radiation amount of electromagnetic radiation caused by an interconnection on the basis of design information related to each of the printed circuit board having a ground plane, interconnections formed on the printed circuit board, and components to be mounted on the printed circuit board, an arithmetic unit calculates a common mode (CM) radiation amount of the interconnection on the basis of a CM radiation amount ratio that indicates a ratio of a common mode (CM) radiation amount of electromagnetic radiation caused by the ground plane in correspondence with the interconnection to a differential mode (DM) radiation amount of electromagnetic radiation caused by the interconnection. A printed circuit board design support method and program are also disclosed.

Abstract: Disclosed is a power decoupling circuit generating system and method capable of easily generating a power decoupling circuit for each device such as an LSI. On the basis of information regarding parameters of generating a power decoupling circuit held in a capacitor parts library and a line calculation parameter file, a power decoupling circuit of a &pgr;-type low pass filter construction having first and second decoupling capacitors to be added to a power supply terminal of a device as a target from which high frequency noise is prevented from being passed to a power plane and a power line corresponding to an inductance is automatically generated by a power decoupling circuit generating unit, thereby making calculation for generating the power decoupling circuit unnecessary.

Abstract: Printed circuit board 1 on which LSI2 is mounted comprises first capacitors 4a and 4b for electrically connecting power source terminals 3a and 3b to via holes 8b, first power source wiring 5a, second power source wiring 6a and a second capacitor 7a. In a predetermined frequency range, the characteristic impedances in power source wirings 5a and 6a are set to three times or more higher than the impedances in capacitors 4a, 4b and 7a. In addition, the lengths of power source wirings 5a and 6a are set to equal to or larger than a value obtained by multiplying 20 mm by the wavelength reduction rate of the printed circuit board and equal to or smaller than a value obtained by multiplying one quarter the wavelength at the upper limit frequency in the predetermined frequency range by the wavelength reduction rate.

Abstract: A novel magnetic read/write system, in which a fixed MR head serves to read magnetically recorded data from a magnetic recording medium as it operates at a relative speed of 2.0 to 5.0 m/s with respect to the magnetic recording medium comprising a non-magnetic support and a magnetic layer.

Abstract: In a method of manufacturing a polarization-maintaining optical fiber coupler by heating lengthwise portions of two polarization-maintaining optical fibers extending side by side, and elongating the heated portions to thereby form a fused-elongated section, elongation is terminated when the cyclic changes in a coupling ratio of two polarized waves according to an elongation length at a wavelength in use are both within first two cycles, so that the coupling ratio of one of the polarized waves is equal to or less than 10% and the coupling ratio of the other one of the polarized waves is equal to or greater than 90%. This method can provide a polarization-maintaining optical fiber coupler whose coupling ratio has a large dependency on polarization with a short elongation length.

Abstract: The present invention provides a design support system including: a basic functional block for designing a printed board including at least a ground layer; and a first additional functional block for finding at least one resonant frequency to the ground layer based on an information of a resonance-significant size of the ground layer.

Abstract: A nickel hydroxide positive active material for an alkaline battery contains nickel hydroxide powder having a nickel valence of greater than 2; and a cobalt compound having a cobalt valence of greater than 2, which is formed on the surface of said nickel hydroxide powder. For example, the surface of nickel oxyhydroxide powder is covered by cobalt oxyhydroxide layer. This positive active material is used as a starting material to produce an electrode by retaining it in a three-dimensional porous material.

Abstract: Disclosed herein is a printed circuit board comprising a ground layer and a signal layer in which the characteristic impedance of a specific source line is made to be not less than three times as large as the impedance at an upper limit frequency at which the electromagnetic wave radiation of a specific capacitor may occur. In this printed circuit board, variation of a power source voltage and unnecessary electromagnetic wave radiation can be suppressed.

Abstract: A design assisting system is constructed as a CAD (computer-aided design) system for assisting in designing printed-circuit boards or other electronic devices. The system makes it possible to design layouts for reducing an unwanted electromagnetic radiation due to a common-mode current. The system has a first tool for converting at least a set of an electronic device, an interconnection, and a ground plane from layout information of a circuit board into a model for analyzing an electromagnetic field, a second tool for specifying a frequency and calculating a magnetic field intensity distribution near the ground plane using the model, and a third tool for superposing the calculated magnetic field intensity distribution and the position of the interconnection, determining whether a position where a magnetic field or a current is strong and the position of the interconnection are close to each other or not, and outputting a determined result.

Abstract: Disclosed is a power decoupling circuit generating system and method capable of easily generating a power decoupling circuit for each device such as an LSI. On the basis of information regarding parameters of generating a power decoupling circuit held in a capacitor parts library and a line calculation parameter file, a power decoupling circuit of a &pgr;-type low pass filter construction having first and second decoupling capacitors to be added to a power supply terminal of a device as a target from which high frequency noise is prevented from being passed to a power plane and a power line corresponding to an inductance is automatically generated by a power decoupling circuit generating unit, thereby making calculation for generating the power decoupling circuit unnecessary.

Abstract: A nickel hydroxide positive active material for an alkaline battery contains nickel hydroxide powder having a nickel valence of greater than 2; and a cobalt compound having a cobalt valence of greater than 2, which is formed on the surface of said nickel hydroxide powder. For example, the surface of nickel oxyhydroxide powder is covered by cobalt oxyhydroxide layer. This positive active material is used as a starting material to produce an electrode by retaining it in a three-dimensional porous material.

Abstract: Disclosed is a magnetic recording medium excellent in surface properties, good in electromagnetic characteristics, and excellent in durability, which comprises a non-magnetic support and a magnetic layer formed thereon, wherein said magnetic layer contains a ferromagnetic powder, and as binders, at least a vinyl chloride resin having a S-containing polar group and a polyurethane resin having phosphobetaine and/or phosphamine as a polar group.

Abstract: A printed circuit board is disclosed. A top layer power supply pattern and a top layer ground pattern are formed. The top layer power supply pattern and the top layer ground pattern are connected to a power supply layer and a ground layer through a plurality of viaholes, respectively. A plurality of capacitors or a plurality of capacitor resistor series circuits are disposed at predetermined intervals between the top layer power supply pattern and the top layer ground pattern.

Abstract: A food packaging stretch film made of a resin containing substantially no chlorine and having a storage modulus (E′) of from 5.0×108 to 5.0×109 dyn/cm2 and a loss tangent (tan &dgr;) of from 0.2 to 0.8, as measured by dynamic viscoelasticity measurement at a frequency of 10 Hz at a temperature of 20° C.