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Nippon Kaiji Kyokai is a ship classification society.It is also known by the brand name “ClassNK” or often in the industry as just “NK”. It is a not for profit society dedicated to ensuring the safety of life and property at sea, and the prevention of pollution of the marine environment.The principal work of the Society's expert technical staff is to undertake surveys to ensure that the rules which it has developed, are applied to both newly built and existing ships in order to ensure the safety of these vessels. The rules cover not only hull structures, but also safety equipment, cargo handling gear, engines, machinery, and electrical and electronic systems among others.By the end of December 2007, the Society had 6793 ships totaling 152.22 million gross tons under class. This figure represents approximately 20 percent of the world merchant fleet currently under class. Although based in Japan, ClassNK has worldwide representation through a network of exclusive surveyor offices. ClassNK's surveyors work in shipbuilding and repair yards and at ports across the world, wherever they may be called upon to examine the condition of a ship so that all of the Society's services are available worldwide. On November 15, 1999, Nippon Kaiji Kyokai celebrated the centenary of its foundation.On 28 May 2012, ClassNK officially announced that its register had surged past the 200 million gross ton mark becoming the world’s first class society in history to have more than 200 million gross tons on its register. Wikipedia.


Kamata K.,Nippon Kaiji Kyokai | Chikaraishi Y.,Japan Agency for Marine - Earth Science and Technology
Bunseki Kagaku | Year: 2014

Compound-specific stable isotope analysis (CSIA) of nitrogenous compounds has been carried out by using a gas chromatography/isotope ratio mass spectrometry (GC/IRMS) system, which traditionally includes two separate conversion processes: the oxidation of nitrogenous compounds to N2 and NOx; and the reduction of the NOx to N2. However, the last major update of the GC/IRMS instrument combined these two processes into one unit by introducing a high-temperature combustion reactor. However, few studies have evaluated the applicability of this new GC/IRMS system to measuring the nitrogen isotopic composition of compounds of interest. In the present study, we determined the nitrogen isotopic composition of ten amino acids by this new GC/IRMS system, and obtained the isotopic composition with 0.6 ‰ for accuracy (mean of Δ) and 1.2 %o for precision (mean of 1σ). These results suggest that the new GC/IRMS system is basically applicable to the CSIA of nitrogenous compounds, and also that further optimization is required for reducing the analytical error to that of the traditional GC/IRMS system (ca. 0.0 ‰ for accuracy and 0.4-0.7 ‰ for precision). © 2014 The Japan Society for Analytical Chemistry.


Yamamoto N.,Nippon Kaiji Kyokai
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE | Year: 2015

Corrosion condition is predicted based on the corrosion model. The corrosion model is necessary to be identified according to the corrosion data collected from the various vessels because corrosion phenomenon is stochastic. However, in order to predict corrosion condition of one specific vessel, such corrosion model is necessary to be modified to reflect the effect of specific corrosion environment of the subject vessel. In the study, procedure of updating corrosion model was investigated based on Bayesian inference on the parameters in the probabilistic corrosion model which utilizes the thickness measurements data. The developed procedure was demonstrated by the application of actual thickness measurements data of the vessel. Even though the amount of corrosion data was limited, the corrosion prediction model was well updated which could be verified by the concentration of posterior distribution which shows the degree of belief on the parameters in the probabilistic corrosion model. The estimated distributions of coating life and corrosion wastage were compared with the frequency distributions obtained by the corrosion data. The estimated distributions of coating life and corrosion wastage showed good agreement with the frequency distributions obtained by the corrosion data. © 2015 by ASME.


Ogura T.,Osaka University | Ueda K.,Osaka University | Saito Y.,Osaka University | Saito Y.,Nippon Kaiji Kyokai | Hirose A.,Osaka University
Materials Transactions | Year: 2011

Nanoindentation measurements were successfully applied to the interfacial reaction layers in dissimilar metal joints of 6000 series aluminum alloys containing alloying elements to steel in order to characterize their mechanical properties. The nanoindentation hardness of the reaction layer formed at the aluminum side was lower than that formed at the low carbon steel (SPCE) side of the investigated joints. At the aluminum side, the nanoindentation hardness changed by the addition of alloying elements. The hardness of the resulting Al12Fe3Si intermetallic compound (IMC) (and the same IMC containing Cu) was lower than that of Al3Fe In comparison with the hardness values obtained from bulk Al-Fe binary series IMCs, it is considered that hardness changes of interfacial reaction layers are derived from the crystal structural changes produced by the alloying elements. The result of micro-testing of Al-Fe series IMCs indicates that the modification of the interfacial reaction layer by alloying elements contributes to higher ductility and the improvement of joint strength through crystal structural change. © 2011 The Japan Institute of Light Metals.


Yamamoto N.,Nippon Kaiji Kyokai
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE | Year: 2014

Corrosion prediction model which takes an effect of maintenance and repair into account is developed based on the full probability corrosion model. Over-all coating repair, touch-up coating repair and renewing repair of worn member are considered. Change in the corrosion condition due to the maintenance and repair work is modeled and possibility of such change is evaluated. Based on the developed model, the effects of these maintenance and repair methods to the corrosion condition are numerically examined and discussed. In these numerical examinations, a conventional paint coating and a coating which meets the PSPC (IMO's Performance Standard for Protective Coatings) specification are examined. Change in corrosion wastage condition due to the maintenance and repair works is evaluated and compared. And the probability that the corrosion wastage exceeds the permissible level is also evaluated. Copyright © 2014 by ASME.


Monobe Y.,Nippon Kaiji Kyokai
Cellulose Chemistry and Technology | Year: 2016

For selective preconcentration and separation of indium, functionalized cellulose with iminodiacetic acid (Chelest Fiber IRY-HW) was examined. The chelating cellulose as well as its indium complex was characterized by elemental analysis and IR-spectroscopy. The surface concentration of the functionalized ligand was determined to be 2.0 mmolg"1. The Langmuir adsorption capacity of the adsorbent for indium was found to be 1.5 mmol g"1. The applicability of IRY-HW for the selective separation of indium from metallic zinc and zinc sulfate compound was investigated. The maximum adsorption of indium was observed in the pH range 1.6-8.0 and the retained indium was eluted with 20 mL of lmol/L HN03. The effect of interferences on the sorption of indium ion was also studied. A preconcentration factor of 100 can be achieved by passing 2000 mL of sample through a column and using 20 mL of elution volume. The method can be successfully applied to the determination of indium in metallic zinc and zinc sulfate samples.

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