Tokyo, Japan

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Kitaori N.,Tokyo National College of Technology | Yoshioka R.,Tokyo National College of Technology | Ohnishi N.,Hakuto Co. Ltd.
Electrochemistry | Year: 2015

The removal of stainless steel discoloration caused by the laser beam was tried using a scale remover with the arcwelding, but it was not removed. Therefore, comparison analysis about a color change of the stainless steel surface with the laser beam and the arc-welding was investigated. As a result, the main composition of discoloration caused by the arc-welding was Fe2O3 and that of the laser beam processing was Fe3O4. And the thickness of oxidation layer caused by the laser beam was 17 times of that of the arc-welding. © The Electrochemical Society of Japan, All rights reserved.

Tokanai F.,Yamagata University | Kato K.,Yamagata University | Anshita M.,Yamagata University | Izumi A.,Yamagata University | And 2 more authors.
AIP Conference Proceedings | Year: 2011

A new compact accelerator mass spectrometry (AMS) system has been installed in the Kaminoyama research institute at Yamagata University. The AMS system is based on a 0.5 MV Pelletron accelerator developed by National Electrostatics Corp. The performance of the system was investigated using C series samples (C1-C8), standard samples (HOxII), and reagent graphite without any chemical treatment. The precision of 14C measurements for the standard samples is typically higher than 0.3%. The ratio of 14C to 12C is less than 6 × 10-16 for the reagent graphite. In this paper, we present the performance of the new compact AMS system, as well as of the fully automated 20-reactor graphite lines equipped at the research institute. © 2011 American Institute of Physics.

Hakuto Co. Ltd. | Date: 2016-03-16

The application relates to a process for inhibiting polymerization of an aromatic vinyl compound during the stage of producing, purifying, storing or transporting the aromatic vinyl compound which not only inhibits an initial polymerization but also inhibits efficiently polymerization over a long period of time and which is excellent in the handleability. The process comprises adding a nitrogenous aromatic compound of formula (IV) in combination with a sulfonic acid compound or sulfuric acid to the aromatic vinyl compound.

Matsuishi S.,Tokyo National College of Technology | Kitaori N.,Tokyo National College of Technology | Ohnishi N.,Hakuto Co. Ltd.
Electrochemistry | Year: 2013

Stainless steel is preventive enough against rust, and is widely put to practical use because of the excellence in its material in aspects of sanitation. Junctions of the material change their color owing to high temperature in carrying out joining work by arc-welding. By performing the analysis of the portions where colors are changed and its execution together with high temperature accompanied with weldment, iron is isolated to be changed in its color. Based upon these results, a reagent with both higher safety and higher removal rate than conventional chemicals allowing change of color to be removed has been developed. © The Electrochemical Society of Japan. All rights reserved.

Hakuto Co. Ltd. | Date: 2016-03-29

Cosmetics; bath and cosmetic soaps.

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