KoreaScience (Korea)

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KoreaScience (Korea)

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British Library Electronic Table of Contents (United Kingdom)

The paper discusses the aspects of repair and retrofitting technique adopted for a damaged reinforced concrete beam-column joint specimen under cyclic loading. A specimen designed based on Indian Standard specifications with consideration of seismic load but without adopting ductile detailing (NonDuctile) was investigated under reverse cyclic loading. Then, the damaged nonductile specimen was repaired with epoxy mortar and grouted using low viscous polymer, and retrofitted using fiber reinforced plastic (FRP) wrapping in beam and column components and steel plate jacketing in joint region. The experimental results showed that the retrofitted specimen not only regained its original strength and stiffness but also has overcome the deficiencies of nonductile detailing. The present study shows...

British Library Electronic Table of Contents (United Kingdom)

An assessment of the joint shear strength of exterior concrete beam-column joints reinforced internally with Glass Fibre Reinforced Polymer (GFRP) reinforcements under monotonically increasing load on beams keeping constant load on columns is carried out in this study. Totally eighteen numbers of specimens are cast and tested for different parametric conditions like beam longitudinal reinforcement ratio, concrete strength, column reinforcement ratio, joint aspect ratio and influence of the joint stirrups at the joint. Also finite element analysis is performed to simulate the behaviour of the beam-column joints under various parametric conditions. Based on this study, a modified design equation is proposed for assessing the joint shear strength of the GFRP reinforced beam-column specimens b...

International Nuclear Information System (INIS)

Advances in the diagnosis of Ewing's sarcoma of the rib were considered and retrospective analysis of the treatment of 32 patients (76% of them were children at the age of 10-15 y.o.) in the clinic of children oncology was performed. It was shown that the diagnosis of Ewing's sarcoma of the rib in children ought to be combined taking into account the course, morphology and radiation examination techniques. Most optimum treatment consisted of combined therapy (cyclic polychemotherapy, lesion focus irradiation at the summary focus dose of 57 Gy, surgery with subsequent polychemotherapy for not less than 1.5 years

International Nuclear Information System (INIS)

Comprehensive investigation has been made into the application of the polymerization hardening by radiation, particularly electron beam, to the composites of polymers and other materials. The report is divided into four parts, namely 1) characteristics and problems of the reaction of curing by radiation polymerization, 2) improvement of the bonding capability of high molecular weight materials, 3) bonding by radiation, and 4) composites made by the impregnation and polymerization hardening of monomers. The first part includes the effects of dose rate, temperature rise during the hardening, the peculiarity of electron beam irradiation at high dose rate, reaction environment and additive effects. Main conclusions are as follows: caution must be taken to the amount of residual double bonds because they affect the quality of hardened polymers; the polymerization hardening reaction at high dose rate cannot be analogized by that at low dose rate; and the presence of the inhibitors of radical ...

Energy Technology Data Exchange (ETDEWEB)

A UPS based on a line-interactive system for CATV (Cable TV) networks has been newly developed. An inverter of the UPS featuring a pure sine wave output and equipped with an uninterrupptible transfer switch made it possible to raise its reliability high and to reduce the uninterruptible transfer time from 50 {approx} 100 ms to only 3 ms. The expected life of 15 years and maintenance-free of the UPS were realized by monitoring and optimizing the operational conditions of lead-acid batteries, aluminum electrolytic capacitors and cooling fans. The use of rust- and weather- resistant painting methods for an outer box of the UPS also contributed to extend the life of the system. (author)

Energy Technology Data Exchange (ETDEWEB)

Ceramic ball bearings of silicon nitride are used for hard disk drive (HDD) spindle motors, to increase seed, reliability and memory capacity of the HDDs. Silicon nitride ceramics have advantages of lightweight, high strength and hardness over the conventional steel for bearings, but is expensive. A new process of high cost performance has been developed for mass production of the small-size ceramic balls. The company plans to apply these bearings to higher devices, e.g., servers, for the time being, and to expand the applicable areas, e.g., common devices and other small-size motors. The ceramic bearings have been developed jointly with Koyo Seiko Co. Ltd. (translated by NEDO)

Energy Technology Data Exchange (ETDEWEB)

A new exhaust cleaning system is introduced, aiming to remarkably reduce NOx emission using a type of EGR method (hybrid EGR) of feeding back the exhaust from an exhaust cleaning ternary catalyst provided gasoline engine to the Diesel engine intake on one hand and, on the other hand, aiming to reduce even the emitted particulates using an exhaust supplying gasoline engine driven supercharger for an enhanced Diesel engine supercharging. The hybrid EGR system used here can uniformly reduce the emitted NOx under any load conditions and, as compared with the conventional type, is two to three times more effective, with the EGR rate kept constant. The exhaust concentration is approximately 10%. An sample of the hybrid EGR was simulated, and it was shown, as compared with the original non-supercharged Diesel engine, that the emitted NOx decreased to 1/3 or 1/4, that the exhaust concentration was approximately the same, and that the total fuel consumption was less, as determined using the sum ...

Energy Technology Data Exchange (ETDEWEB)

This paper describes zinc-air battery for electric vehicle (EV). This battery is composed of air electrode, zinc electrode, and alkali electrolyte. During the discharge, oxygen taken from the air is reduced at the air electrode, and zinc is dissolved at the zinc electrode. The whole reaction is formation of zinc oxide from oxygen and zinc. This is taken out to use as a secondary battery through exchange and regeneration, which is called mechanical charge. For Electric Fuel, discharged products in the zinc electrode from a spent EV are extracted by a vibrating crusher, and are dissolved in KOH to prepare zinc ion electrolyte. Thus, zinc is obtained through the electrolytic refining. Since the regenerated zinc is separated from the electrolytic electrode as a form of dendritic powder, it is recovered, treated by press molding, regenerated, and used as a zinc electrode. The battery developed by Electric Fuel is tested for applying it to the mail delivery in Germany. It has a running ...

Energy Technology Data Exchange (ETDEWEB)

Stainless steel is pickled in pickling bath with the sulfuric acid and a mixture of hydrofluoric acid and nitric acid. Suitable equipment based on speedy and accurate chemical analysis for actual production lines has not been developed yet. The concentration of sulfuric acid can be analyzed by using the neutralization titration method. As a method of analyzing hydrofluoric acid in the mixed acid, the iron-acetylacetone complex discoloration absorbance method was adopted. For the concentration, of nitric acid, the method of subtracting the concentration of hydrofluoric acid from the total mixed acid amounts obtained by neutralization titration is adopted. Furthermore, the iron-salicylic acid complex absorbance method is adopted as a method of analyzing the iron content. By adopting these methods, the fully automated analyzer is developed. Completing analysis work can be shortened to 40 minutes by automated sampling from the acid pipes. The fully automated acid supply and exhaust system ...

International Nuclear Information System (INIS)

Y2Te4O11:Eu3+ and Y2Te5O13:Eu3+ single crystals in sub-millimeter scale were synthesized from the binary oxides (Y2O3, Eu2O3 and TeO2) using CsCl as fluxing agent. Crystallographic structures of the undoped yttrium oxotellurates(IV) Y2Te4O11 and Y2Te5O13 have been determined and refined from single-crystal X-ray diffraction data. In Y2Te4O11, a layered structure is present where the reticulated sheets consisting of edge-sharing [YO8]13- polyhedra are interconnected by the oxotellurate(IV) units, whereas in Y2Te5O13 only double chains of condensed yttrium-oxygen polyhedra with coordination numbers of 7 and 8 are left, now linked in two crystallographic directions by the oxotellurate(IV) entities. The Eu3+ luminescence spectra and the decay time from different energy levels of the doped compounds were investigated and all detected emission levels were identified. Luminescence properties of the Eu3+ cations have been interpreted in consideration of the now accessible ...

Energy Technology Data Exchange (ETDEWEB)

A method for detecting electrons emitted as secondary particles by photon incidence to a specimen, as well as a method of using the photons emitted by electron incidence as detecting particles are explained. Pd-Si(100)2{times}1 system is adopted for a case study of using photo-electron spectroscopy where synchrotron emitted light in soft X-ray region is used as the incident light. Pd atoms are deposited little by little on clean Si surface to investigate the electron structure of the surface, and the interface electron structure after bonded formation of Pd(thin film)-Si(substrate) is estimated. Radiation soft X-ray spectroscopy is employed to observe the real state of the bonded interface of Pd(thin film)-Si(substrate) prepared by depositing Pd film in a short period of time. In the case of radiation soft X-ray spectroscopy with electron beam excitation, bonded system of thin film and substrate can be investigated by nondestructive analysis even when the film thickness is ...

Energy Technology Data Exchange (ETDEWEB)

For large transmission steel towers to be built in a mountainous area, caisson type pile foundations are often applied. The works for construction of this kind of foundation are manned operations such as drilling, arranging reinforcements, concrete laying, etc. in a narrow vertical pit which is 3m in diameter and about 20m in depth, but securing labour force of good quality for such works becomes increasingly difficult. In order to cope with the above situation and achieve reduction of costs, shortening of construction period, improvement of safety, saving of manpower, etc. a power supply company and construction companies have developed jointly a method of unmanned construction in a caisson type pile foundation pit. This method consists of the use of a caisson type pile full size excavator (this consists of an excavator proper, a vacuum soil discharging device, a monitor/controller, a load crane and a reaction pad, and performs continuously unmanned operations in a pit of fullsize ...