Nec Corporation

Jfe Steel Corporation

Yusuke Kimata

Yoshihiko Ono

Masaki Ichihara

Yuji Tanaka

Kozo Harada

Kenji Kawamura

Kohei Hasegawa

Masaki Tada

Yuki Toji

Hiroyuki Masuoka

Shimpei Yoshioka

Koichiro Fujita

Shuji Yamaguchi

Shinsuke Komine

Yoshie Obata

A high-strength cold-rolled steel sheet comprises: a chemical composition that contains C, Si, Mn, P, S, N, Al, Ti, Nb, and B with a balance consisting of Fe and inevitable impurities, and satisfies [mol % N]/[mol % Ti]<1; and a steel microstructure in which: an area fraction of ferrite is 12% or more and less than 30%; a total area fraction of tempered martensite and bainite is 55% or more and 85% or less; an area fraction of quenched martensite is 15% or less; an area fraction of retained austenite is 1% or more and 10% or less; an area fraction of low-Mn ferrite having a Mn concentration of 0.8×[% Mn] or less is 5% or more and 20% or less; a result of subtracting the area fraction of the low-Mn ferrite from the area fraction of the ferrite is 10% or more; an area fraction of a residual microstructure is less than 3%; and an average grain size of the low-Mn ferrite is 10 μm or less.

High-strength cold-rolled steel sheet, high-strength coated or plated steel sheet, method of producing high-strength cold-rolled steel sheet, and method of producing high-strength coated or plated steel sheet

A high-strength steel sheet having a tensile strength TS of 1320 MPa or more and excellent workability. The high-strength steel sheet has a chemical composition containing, by mass %, C: 0.20% or more and 0.40% or less, Si: 0.5% or more and 2.5% or less, Mn: more than 2.4% and 5.0% or less, P: 0.1% or less, S: 0.01% or less, Al: 0.01% or more and 0.5% or less, N: 0.010% or less, and Fe and inevitable impurities. A microstructure of the steel sheet includes, in terms of area fraction with respect to the whole steel sheet microstructure, lower bainite in an amount of 40% or more and less than 85%, martensite including tempered martensite in an amount of 5% or more and less than 40%, retained austenite in an amount of 10% or more and 30% or less, and polygonal ferrite in an amount of 10% or less (including 0%).

High-strength steel sheet and method for manufacturing the same

A high-strength steel sheet having a tensile strength (TS) of 1,320 MPa or more and good workability. The high-strength steel sheet has a specific component composition and a steel microstructure containing, on an area-percentage basis with respect to the entire steel microstructure, 40% or more and less than 85% of a lower bainite, 5% or more and less than 40% martensite including tempered martensite, 10% or more and 30% or less retained austenite, and 10% or less (including 0%) polygonal ferrite, the retained austenite having an average C content of 0.60% by mass or more. Additionally, a Mn segregation value at a surface of the steel sheet is 0.8% or less, the ratio R/t of a limit bending radius (R) to a thickness (t) of the steel sheet is 2.0 or less, and tensile strength&#xd7;total elongation of the steel sheet is 15,000 MPa % or more.

High-strength steel sheet and method for producing the same

Provided is a high-strength cold-rolled steel sheet has a chemical composition containing, by mass %, C: 0.10% or more and 0.6% or less, Si: 1.0% or more and 3.0% or less, Mn: more than 2.5% and 10.0% or less, P: 0.05% or less, S: 0.02% or less, Al: 0.01% or more and 1.5% or less, N: 0.005% or less, Cu: 0.05% or more and 0.50% or less, and the balance being Fe and inevitable impurities, and a tensile strength of 1180 MPa or more, in which a steel sheet surface coverage of oxides mainly containing Si is 1% or less, a steel sheet surface coverage of iron-based oxides is 40% or less, Cu/Cuis 4.0 or less, and a tensile strength is 1180 MPa or more, where Cudenotes a Cu concentration in a surface layer of a steel sheet and Cudenotes a Cu concentration in base steel.

High-strength cold-rolled steel sheet

The present surface mount technology non-reciprocal circuit element () includes a ferromagnetic material () placed above a circuit board (), and a conductor cover (). The conductor cover () is composed of a main unit () located above the ferromagnetic material () and connecting members (___) for electrically connecting the main unit () with transmission lines (___) on the circuit board (), respectively. The ferromagnetic material () and at least one of the connecting members (___) are formed so as to create, in at least one of gaps between the side surface of the ferromagnetic material () and each of the connecting members (___), a location where a clearance between a side surface of the ferromagnetic material () and the connecting member is a first clearance and a location where it is a second clearance different from the first clearance.

Non-reciprocal circuit element and wireless communication device

A bake-hardening galvanized steel sheet having a base steel sheet and a coating layer formed on the base steel sheet, the base steel sheet having a specified chemical composition and a metallographic structure including a ferrite phase and a cementite phase, in which an average ferrite grain diameter is controlled to be 10 &#x3bc;m or more and 30 &#x3bc;m or less, and in which the surface area of the interface between ferrite and cementite per unit volume is controlled to be 1.0/mm or more and 10.0/mm or less, a hydrogen concentration in steel of the base steel sheet is controlled to be less than 0.1 ppm, and a zinc coating weight per unit surface area of the steel sheet is controlled to be 40 g/mor more and 100 g/mor less.

Bake-hardening galvanized steel sheet

A transmission power adjustment value acquisition unit references a transmission power/adjustment value table to output a transmission power adjustment value for transmission power. A transmission frequency correction value acquisition unit references a transmission frequency/correction value table to output a transmission power correction value, from a center frequency of the position of an RB that is sent from a used transmission frequency calculation unit and that will actually be used. An adjustment value addition unit adds the adjustment value for the obtained transmission power and the transmission power correction value for the center value of the position of the RB that will actually be used, and calculates the transmission power setting. Since the transmission power correction value is obtained from the center frequency of the position of the RB actually transmitted, misalignment between the transmission power setting and the actual transmission power is reduced.

Wireless transmission device, power control method and program

In a voltage supply control device, a voltage conversion circuit receives a voltage from a battery and generates a desired voltage. A switching control unit executes switching so as to supply a voltage to a power amplification circuit through the voltage conversion circuit when the voltage of the battery is equal to or more than a predetermined threshold value or supply the voltage to the power amplification circuit from the battery without intervention of the voltage conversion circuit when the voltage of the battery is less than the predetermined threshold value. The switching control unit uses different voltage threshold values for a plurality of transmission modes classified in accordance with the assumed values of appropriate voltages to be supplied to the power amplification circuit. A cellular phone terminal and a voltage supply control method are also disclosed.

Voltage supply control device and voltage supply control method

In response to the occurrence of an application event in a portable terminal with the communication function that has an application control CPU (ACPU) and a communication control CPU (CCPU), the operation of a control target unit, which is under control of a CCPU and which operates at an intermittent reception time, is detected. During the operation period of the control target unit, an ACPU sends a transmission request to the CCPU to start the CCPU. When the CCPU is in the sleep state in the intermittent reception cycle, the CCPU is not started by the ACPU.

Multiple-CPU portable terminal with communication function and control method

In a reception diversity system, a wireless apparatus includes an RF unit, analog signal processing unit, digital signal processing unit, and a control unit which controls the RF unit. The control unit operates only a predetermined system of systems while stopping the remaining systems for at least each intermittent operation period in intermittent reception operation of the RF unit, and stops all the systems in an intermittent stop period in the intermittent reception operation. The digital signal processing unit sets, in the RF unit, an initial reception gain estimated from an arbitrary past reception gain used in a past intermittent operation period as a first reception gain in a new system which is operated in accordance with arrival of a next intermittent operation period, thereby performing switching control of a plurality of systems which respectively demodulate received radio waves, and obtaining desired reception data. A control method for a reception diversity system is also disclosed.

Reception diversity system and control method therefor

A camerafor imaging a call-sender, a monitorfor projecting the call-receiver who is the party on the other end of the phone and a transceiverused for the call are provided. The transceivercomprises a mikefor collecting the voice of the call-sender and a speakerfor outputting the voice of the call-receiver. A caption image (an arrow) is indicated on the monitorfor directing the caller's line of sight to the cameraand a light flashing systemis provided on the periphery of the camera

Picture-phone device providing means for guiding operator's line of sight to specific direction therein

A compound information terminal, a mobile communications system and a control method thereof, which prevent the reception on a GPS terminal unit in operation from being affected by interference without turning off a 3GPP-compliant mobile telephone unit or disabling it for transmission. The compound information terminal comprises a user interface unit, a terminal control unit, a 3GPP-compliant mobile telephone unit and a GPS terminal unit. When the GPS terminal unit is activated, the terminal control unit switches the operation of the 3GPP-compliant mobile telephone unit to the compressed mode, in which the transmission is suspended at intervals of arbitrary period of time. Accordingly, the GPS terminal unit can be brought into action while the 3GPP-compliant mobile telephone unit suspends its transmission operation. With this exclusive operation control performed between the 3GPP-compliant mobile telephone unit and GPS terminal unit, it is possible to prevent the reception on a GPS terminal from being affected by interference.

Compound information terminal, mobile communications system and control method thereof

When a cellular phone terminal is powered on, it immediately receives a reference signal (non-modulated reference frequency signal for correcting a crystal oscillation circuit) for correcting the reception frequency of a radio signal transmitted from a base station at all times, and corrects the error of the reception frequency on the basis of the reference signal received. After the error of the reception frequency is corrected, the cellular phone terminal makes normal communications with the base station.

Frequency correcting method for cellular phone terminal

A terminal device is provided for realizing exclusive control of the portable telephone, GPS and Bluetooth integrated terminal. The terminal device includes a terminal management control device() which in case of detecting all of the portable telephone terminal device(), GPS terminal device() and the Bluetooth terminal device() being set to the ON state, performs exclusive control, based on setting values of the management information, read out from the memory device(), with turning two of the portable telephone terminal device, GPS terminal device and the Bluetooth terminal device on and turning the remaining one off, or alternately turning the Bluetooth terminal device on for a preset time interval and subsequently turning the GPS terminal device off for a preset time while turning on the portable telephone terminal device at all times.

Growing community of inventors

Tokyo, Japan

Yusuke Kimata