Nippon Telegraph and Telephone Corporation

Renesas Electronics Corporation

Ntt Electronics Corporation

Hirose Electric Company, Ltd.

Udc Ireland Limited

Yosuke Takeuchi

Takuya Kamisho

Masayuki Tsuda

Masamitsu Watanabe

Ryuta Ishii

Yosuke Okamura

Junichiro Tamamatsu

Tatsuya Kunikiyo

Eiji Tsukuda

Takashi Miwa

Mikio Tsujiuchi

Kenichiro Sonoda

Ryoji Matsuda

Shibun Tsuda

Hisatoshi Kasahara

Kenichi Mori

Mitsuyoshi Ichihashi

Takeshi Okuyama

Tomoki Murakami

Yutaka Miyamoto

Shinichi Morishima

Norio Sato

Takeharu Kuroiwa

Hiroshi Takada

Eiji Yoshida

Yusuke Nasu

Shinji Mino

Takashi Takenaga

Masayoshi Tarutani

Soichi Oka

Hiroto Kawakami

Kazushige Yonenaga

Etsu Hashimoto

Kazuyuki Omori

Shoichiro Kuwahara

Mitsunori Fukutoku

Tomoyoshi Kataoka

Keisuke Tsukamoto

Shota Oki

Mikio Yoneyama

Tomoki Tasaka

Masamichi Matsuoka

Shigeru Ono

Kazumasa Yoshida

Teruaki Sato

Akio Sahara

Fumiaki Saitou

Masahiro Sotoma

Toshiyuki Ozawa

Atsushi Tomita

A passive relay device () relays radio communication between the inside of a radio wave shielding structure () and the outside of the radio wave shielding the structure (), and the device includes an internal antenna () which connects with the inside, an external antenna () which connects with the outside, and a connection part () which connects the internal antenna () and the external antenna ().

Passive relay device and passive relay method

To repair reinforced concrete easily and at low cost. An anticorrosion method includes infiltrating an anticorrosion solution held inside concrete of reinforced concrete into a vicinity of a reinforcing bar through the concrete to passivate the reinforcing bar, detecting that the anticorrosion solution is infiltrated to a surface of the concrete, and discharging, after detecting the anticorrosion solution, the anticorrosion solution to outside of the concrete to form an anticorrosive coating on a surface of the reinforcing bar.

Corrosion prevention method and corrosion prevention device

An assessment device () according to the present disclosure includes a determination unit () that determines a first period corresponding to a shortest period until deterioration of a concrete structure due to an aging-induced deterioration cause appears and a second period shorter than the first period and corresponding to a longest period until deterioration of the concrete structure due to a material-induced deterioration cause appears and an assessment unit () that assesses that a deterioration causing material is used in a concrete structure having, in a checking result indicating a period elapsed from construction of the concrete structure and the presence or absence of deterioration in the concrete structure, the deterioration and the period elapsed from the construction which is not shorter than the second period and is shorter than the first period.

Concrete structure deterioration determination method, device and program

To improve the accuracy of estimating when a fracture occurred in the metal material. In the estimation apparatus, the fracture temperature estimation unit performs estimate calculation of the fracture temperature of a fractured metal material from the hydrogen embrittlement rate of the fractured metal material, the fracture occurrence time narrowing unit performs calculation by using the temperature information of the installation environment in which the fractured metal material is installed and narrow down the period during which the fracture temperature is obtained as the fracture occurrence period of the metal material, and the fracture time estimation unit performs estimate calculation of the timing of when stress was applied to the fractured metal material during the fracture occurrence period as the timing of when a fracture occurred in the metal material.

Estimation method

A repair apparatus for repairing damaged reinforcing bars in a structure includes a strip-shaped conductor including conductive wires arranged in a height direction, the conductive wires being arranged in parallel, a high-frequency current generation unit configured to supply a high-frequency current between the conductive wires of a first end side of the conductor and the conductive wires of a second end side of the conductor, and a connection body configured to connect the conductive wires to each other and connect the first end side and the second end side of the conductor so that the conductive wires form a coil, and the high-frequency current generation unit supplies a high-frequency current between a conductive wire at an upper end or a lower end of the first end side of the conductor and a conductive wire at a lower end or an upper end of the second end side of the conductor.

Repair device

Reinforced concrete is protected from corrosion without conducting an operation involving exposure of rebar. A reinforced concrete structure is provided with a storage part that is formed inside concrete of the reinforced concrete structure, and that retains an anticorrosion solution. The anticorrosion solution diffuses and permeates through the concrete from the storage part, prevents the concrete in the vicinity of rebar from drying, and passivates the rebar.

Reinforced concrete structure

An estimation method includes: an acquisition step (S) of acquiring deflection stress information that indicates a relationship between a deflection and a tensile stress of a specimen () of a reinforced concrete structure; and a derivation step (S) of deriving an estimation formula for estimating a depth of a crack generated in the reinforced concrete structure when a deflection of the reinforced concrete structure is no less than a first deflection of the specimen at a start of a generation of the crack, and is no greater than a second deflection of the specimen at an end of the generation of the crack.

Estimation method, estimation device, and program

To estimate a fracture starting point of steel due to hydrogen embrittlement with high accuracy. A steel fracture starting point estimation device includes a hydrogen concentration distribution calculation unit adapted to calculate a hydrogen concentration distribution in steel-to-be-estimated when the steel fractures due to hydrogen embrittlement; a local critical hydrogen content calculation unit adapted to calculate critical hydrogen content at which the steel-to-be-estimated fractures due to hydrogen embrittlement; and a fracture starting point estimation unit adapted to read the hydrogen concentration distribution out of a storage unit. To estimate, calculate, from the hydrogen concentration distribution, a location in the steel in which hydrogen concentration of the critical hydrogen content is distributed, and designate the location in the steel as the fracture starting point of the steel-to-be-estimated.

Method for estimating steel rupture starting point, device for estimating steel rupture starting point, and program for estimating steel rupture starting point

To easily detect a crack having occurred in a steel material. A current measurement device measures a value of a current flowing through a target steel material that is immersed in an electrolyte aqueous solution and applied with tensile stress while subjected to hydrogen charging, and a device for detecting the occurrence of a crack or the like uses the measured current value to determine the occurrence of a crack in the target steel material when the amount of change in the current flowing through the target steel material, the change rate of the amount of change in the current, or the change rate of the change rate of the amount of change in the current exceeds a threshold value. The device for detecting the occurrence of a crack or the like determines the occurrence of a crack in the steel material when the change rate of the change rate of the amount of change in the current is less than a negative value of an absolute value of the threshold value, and determines the occurrence of fracture in the steel material when the change rate exceeds the absolute value of the threshold value.

Method for detecting occurrence of cracks and the like, device for detecting occurrence of cracks and the like, and program for detecting occurrence of cracks and the like

An accelerated corrosion test apparatus includes: a moisture sensor disposed near the reinforcing steel exposed from a cracked portion of concrete; a weight measuring instrument that measures a weight of the reinforced concrete specimen; and a control terminal that is connected both to the moisture sensor and to the weight measuring instrument and controls a temperature and humidity control device, thereby alternately and repeatedly performing a wetting step of supplying moisture to the inside of a crack in the cracked concrete, and a drying step of removing moisture in the inside of the crack and moisture on the exposed surface of the reinforcing steel, wherein the control terminal terminates the wetting step and starts the drying step when moisture is detected in the moisture sensor, or when change in slope of weight change of the reinforced concrete specimen is detected, after the start of the wetting step.

Method and apparatus for accelerated corrosion testing

A composition ratio calculating unit configured to calculate a first composition ratio that is a ratio of substance quantities of rust collected from a broken surface of internal steel of an updated old concrete structure and a second composition ratio that is a ratio of substance quantities of rust collected from a surface different from the broken surface, a composition ratio calculating unit configured to calculate a first corrosion time corresponding to the first composition ratio and a second corrosion time corresponding to the second composition ratio from characteristics representing a relation between a first corrosion time and the first composition ratio and a relation between a second corrosion time and the second composition ratio, respectively, and a breaking time calculating unit configured to calculate a time for the internal steel to break by subtracting the first corrosion time from the second corrosion time are included.

Fracture time estimation device for internal steel and method

To estimate penetration behavior of hydrogen up until hydrogen content reaches saturation even if load stress on steel is equal to or higher than threshold stress. A hydrogen penetration behavior estimation device includes a first measurement data input unit adapted to input first measurement data concerning variation of hydrogen content with time up until hydrogen content in steel-to-be-estimated reaches saturation when measurements are taken by applying such stress to the steel that no hydrogen embrittlement fracture occurs; a second measurement data input unit adapted to input second measurement data concerning variation of hydrogen content in the steel-to-be-estimated with time up until the steel fractures when measurements are taken by applying such stress to the steel that hydrogen embrittlement fracture occurs; a ratio calculation unit adapted to calculate increases in hydrogen contents in an initial stage of measurement and calculate a ratio of the second measurement data to the first measurement data in terms of increase in hydrogen content; and a saturated hydrogen content calculation unit adapted to multiply saturated hydrogen content based on the first measurement data by the ratio and designate the product as saturated hydrogen content of the steel-to-be-estimated, the saturated hydrogen content being reached upon application of such stress that hydrogen embrittlement fracture occurs.

Method for estimating hydrogen absorption behavior, device for estimating hydrogen absorption behavior, and program for estimating hydrogen absorption behavior

Example implementations involve an electrical connector and a test method of the electrical connector, wherein the electrical conduction condition between a ground member and a ground terminal can be easily confirmed while reliably contacting the ground member and ground terminal. Electrical connector involves a plurality of terminals including two types of terminals, namely, signal terminals and ground terminals; a retaining body, made of an insulating material, that arranges and retains the plurality of terminals in a condition where the signal terminals and ground terminals are intermingled; and a ground member retained by the retaining body on the inward side of the retaining body, in a condition contacting at least two ground terminals; wherein the ground member has a detecting part exposed from the retaining body in order to detect an electrical conduction condition between the ground terminals and the ground member.

Electrical connector and test method for electrical connector

An electrical connector with a shielding plate in which signal terminals and ground terminals supported by insulating members are arranged in an intermixed order, signal terminals have at least a portion in the longitudinal direction thereof covered by a shielding plate, and respective contact portions formed in free end portions at the front ends of the signal terminals and ground terminals are subject to contact pressure applied by the corresponding counterpart terminals to one side of said contact portions, thereby resulting in resilient flexure, wherein in the shielding plate, at positions corresponding to the ground terminals in the direction of terminal array, there are provided grounding strips parallel to said ground terminals, said grounding strips extend forward and, at least in a state of contact between the ground terminals and counterpart terminals, the other side of the ground terminals is in contact with and supported by the grounding strips.

Electrical connector with a shielding plate

An improvement is achieved in the performance of a semiconductor device. A semiconductor device includes an n-type semiconductor region formed in a p-type well, an n-type semiconductor region formed closer to a main surface of a semiconductor substrate than the n-type semiconductor region, and a p-type semiconductor region formed between the n-type semiconductor region and the n-type semiconductor region. A net impurity concentration in the n-type semiconductor region is lower than a net impurity concentration in the n-type semiconductor region. A net impurity concentration in the p-type semiconductor region is lower than a net impurity concentration in the p-type well.

Semiconductor device and manufacturing method thereof

Growing community of inventors

Tokyo, Japan

Yosuke Takeuchi