Hitachi, Ltd.

Nippon Steel Sumitomo Metal Corporation

Kenichi Saitou

Jun Kitahara

Masato Ishii

Masaya Umemura

Nobuhiko Hara

Nobuaki Kabuto

Hideki Osaka

Koichi Okazawa

Kouji Kitou

Ikuya Arai

Shigeo Ohashi

Kazuhiro Shimoda

Tomio Yamakawa

Yasuyoshi Hidaka

Takashi Chikusa

Kazunori Iwabuchi

Rintaro Minamitani

Satoru Yamaura

Yasushi Neho

Yasuto Higashida

Hideo Sawada

Hiroyuki Kumasawa

Daichi Hotta

Kazufumi Kikuchi

Masanobu Uryuu

Yuichi Kondo

Sawamura Shin'ichi

Sawamura Shinichi

Hitoshi Takeoka

Junichi Miyata

By using a piercing mill that includes a pusher on the entrance side, a plug on the exit side along a pass line, and a plurality of angled rolls as being provided around the plug so as face to each other, in the case where the maximum diameter of an unsound region consisting of center segregation and porosity in a cross section of a billet is d [mm], piercing-rolling is performed under the condition that the plug nose rolling reduction ratio (TDF) expressed by Formula (1) satisfies Formula (2).=(Bd&#x2212;1)/Bd&#x2003;&#x2003;(1)&#x2266;&#x2212;0.50&#xd7;(/Bd)+0.06&#x2003;&#x2003;(2)In Formulae (1) and (2), Bd is the billet diameter [mm], and Dis the opening [mm] between the angled rolls at the plug nose position. Thereby, when piercing-rolling is performed, the occurrence of an inner surface flaw attributable to the center segregation and porosity in the billet can be prevented reliably.

Method for producing seamless tube/pipe

A lubricant for hot-rolling tools in which an oxide-based laminar compound such as potassium tetrasilicic mica, sodium tetrasilicic mica, vermiculite, and bentonite, a boric acid compound such as boric acid, potassium borate, and sodium borate, and graphite are dispersed and dissolved in water, and in which the blending proportion of the oxide-based laminar compound to the boric acid compound is, in mass ratio, 10:90 to 70:30, and the content of the graphite is 1.0 to 4.5%. Applying this lubricant on the surface of the mandrel bar at the time of mandrel mill rolling enables a lubricating film to be formed on the surface of the bar and to exert excellent seizure resistance, and also allows the lubricant to be immune from remaining in the inner surface of tube.

Lubricant for hot-rolling tools, and surface treatment method for mandrel bar for use in producing hot rolling seamless tubes

One or more storage controllers include a folder configuration unit for configuring a plurality of folders to store the plurality of contents in the plurality of logical volumes, a core-contents management unit for specifying and managing core-contents to become the core from the plurality of contents to be stored in the plurality of logical volumes or the plurality of folders, a related contents management unit for managing the core-contents and one or more related contents associated with a part or the whole of the core-contents from a plurality of contents to be stored in the plurality of logical volumes or the plurality of folders, and a group folder configuration unit for configuring a group folder that groups the core-contents and the related contents across the plurality of logical volumes or the plurality of folders.

Storage system and management method thereof

An electronic device capable of preventing air from entering a pump for circulating a cooling medium is provided in a small-sized electronic computer provided with a liquid cooling system, which has a liquid cooling construction for circulating a cooling liquid with the use of a power source and for cooling a high temperature part of with the cooling liquid. The electronic device of the invention comprises a gas entering preventing mechanism provided in a part of a circulating path, through which the cooling liquid circulates, to prevent air from entering the power source.

Electronic device, liquid cooling system and tank

An information processing apparatus includes a volatile storage unit and a nonvolatile storage device for storing at least algorithm information for processings executed by the processing unit, processed data inclusive of display-destined data generated in the storage unit and circuit state information concerning individual circuits incorporated in the information processing apparatus during operation of the information processing apparatus, and a control unit for setting a predetermined operation-mode state in accordance with predetermined rules of state transition so as to store selectively the algorithm information, the processed data and the circuit state information in the volatile storage unit and nonvolatile storage device in dependence on the conditions imposed externally through manipulation of the apparatus, whereby the time required for activating or resuming the information processing apparatus is reduced.

Information processing apparatus that can hold internal information

In an image displaying system, the distribution of functions among the image displaying apparatus, the information processing apparatus, and an operating system controlling the operations of the information processing apparatus are clarified, and the capability of the image displaying apparatus to display an image with a display attribute varying from area to area on the display screen of the image displaying apparatus is determined. The image displaying system includes an image displaying apparatus having such a capability, and an information processing apparatus that can generate an image signal and transmit the image signal to the image displaying apparatus. The system can communicate according to USB standards, or according to DDC standards. The information processing apparatus transmits area-attribute information for changing a display attribute of a specific area on the display screen to the image displaying apparatus.

Image displaying system and information processing apparatus

A battery assembly unit and a method of charging the same for applying constant current/constant voltage charging to a battery assembly in which a plurality of battery cell groups each having battery cells each being rechargeable and increasable in electromotive force as charging proceeds are connected in series. There are provided a reference charging voltage circuit for generating charging reference voltages serving as voltages referenced to electromotive force levels of the individual battery cell groups on the basis of charging voltage applied across the battery assembly and changeable with time, and comparison circuits each adapted to compare an electromotive force level across each of the plurality of battery cell groups connected in series with the charging reference voltage. Further, bypass circuits are provided each of which connected in parallel across each of the plurality of battery cell groups connected in series and when an electromotive force of a battery cell group exceeds the charging reference voltage, bypasses the charging current by an amount corresponding to a difference.

Battery unit having a plurality of rechargeable battery cells and method

A method and apparatus for increasing data transfer efficiency for a read operation in a non-split transaction bus environment by substituting a write operation for the read operation. The data transfer efficiency is increased and deadlocking is reduced by substituting two write operations (one from an I/O device to a bus controller and the other from the bus controller to the I/O device) for one read operation. Further, the present invention improves the efficiency of data transfer by maintaining the compatibility of a bus specification when DMA of an I/O bus having no split transfer function, such as a PCI bus or inter-I/O transfer, is executed. A processor instructs a data transfer operation to an I/O device or bus conversion adapter. The I/O device or bus conversion adapter connected to a bus outputs a write access, and a bus connection controller connected to the bus receives the write access and reads data in a main memory. The bus connection controller then transfers read data to the I/O device or the bus conversion adapter. Such an operation may also be performed between two I/O devices or bus conversion adapters.

Increasing data transfer efficiency for a read operation in a non-split

Growing community of inventors

Tokyo, Japan

Kenichi Saitou