Desalting System for Excavated Metal Objects Using High Temperature, High Pressure Deoxygenated Water

IMAZU, Setsuo,KOEZUKA, Takayasu The Korean Society Of Conservation Science For Cul 1996 보존과학회지 Vol.5 No.2

We propose a new method to remove salts that have permeated into excavated metal objects. This method cleans the excavated metal objects by using high temperature, high pressure deoxvgenated water containing inhibitors for corrosion of metals. The method greatly reduces the washing time compared with previous methods. Waste water from the method does not need treatment, nor do chemicals need to be removed from the metal objects. Furthermore, this method is applicable to some kind of metals(for example iron objects, bronze objects). We measured quantitatively the soluble salts dissolved from actual metal objects and found that there was a large difference between soluble chloride ions and sulfate ions.

Pairing Symmetry in the Ordered Honeycomb Network Superconductor BaPtSb

Tsuyoshi Imazu,Masafumi Kudo,Shohei O. Singu,Jun Goryo,Yoshiki Imai 한국물리학회 2023 새물리 Vol.73 No.12

We investigate the pairing symmetry of the ordered honeycomb network superconductor BaPtSb with broken inversion symmetry. There is a preliminary μSR measurement report below critical temperature (Tc) suggesting the superconducting state with time-reversal symmetry breaking (TRSB). In this paper, first principles calculation is performed and we find the effective tight-binding model which reproduces the Fermi surfaces consisting of Pt 5d<SUB>x2-y2</SUB> , 5d<SUB>xy</SUB> and Sb 5p<SUB>z</SUB> orbitals mainly. In order to discuss the pairing symmetry of BaPtSb we classify the gap functions based on crystal point group and solve the gap equations, and the condensation energies are calculated. Consequently, on the most dominant Fermi surface, chiral d-wave state is most stable among the TRSB states.

Desalting System for Excavated Metal Objects Using High Temperature, High Pressure Deoxygenated Water

Setsuo IMAZU,Takayasu KOEZUKA 한국문화재보존과학회 1996 보존과학회지 Vol.5 No.2

Characteristics of localized surface plasmons excited on mixed monolayers composed of self-assembled Ag and Au nanoparticles.

Tanaka, Daisuke,Imazu, Keisuke,Sung, Jinwoo,Park, Cheolmin,Okamoto, Koichi,Tamada, Kaoru RSC Pub 2015 Nanoscale Vol.7 No.37

<P>The fundamental characteristics of localized surface plasmon resonance (LSPR) excited on mixed monolayers composed of self-assembled Ag and Au nanoparticles (AgNPs and AuNPs, respectively) were investigated. Mixed monolayered films were fabricated at the air-water interface at different mixing ratios. The films retained their phase-segregated morphologies in which AuNPs formed several 10 to 100 nm island domains in a homogeneous AgNP matrix phase. The LSPR bands originating from the self-assembled domains shifted to longer wavelengths as the domain size increased, as predicted by a finite-difference time-domain (FDTD) simulation. The FDTD simulation also revealed that even an alternating-lattice-structured two-dimensional (2D) AgNP/AuNP film retained two isolated LSPR bands, revealing that the plasmon resonances excited on each particle did not couple even in a continuous 2D sheet, unlike in the homologous NP system. The fluorescence quenching test of Cy3 and Cy5 dyes confirmed that the independent functions of AuNPs and AgNPs remained in the mixed films, whereas the AuNPs exhibited significantly higher quenching efficiency for the Cy3 dye compared with AgNPs due to the overlap of the excitation/emission bands of the dyes with the AuNP LSPR band. Various applications can be considered using this nanoheterostructured plasmonic assembly to excite spatially designed, high-density LSPR on macroscopic surfaces.</P>

Maritime Casualties Occurred Onboard Ships Registered under the Central American Region Flag States

Oscar Porras Rojas,Hayama Imazu,Takahiko Fujisaka 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-

This research is based on the information compiled on the occurrence of maritime casualties onboard ships registered under Central American Region (CAR) flag States. Due to nonexistence of writing reports in anyone of the countries that are integrating this Region, the information was compiled by the author through personal communication with the people involved in the casualties. The information was compiled by typing up the text and digitizing on the computer for the respective data base. For each casualty occurred, the following information was compiled, date and type of the casualty, position of the ship at the time of the casualty, dimension of the ship, number of people affected by the casualty, and cause and consequences of the casualty. Based on the number of people affected (death and disappear) by the casualties occurred was calculated the mortality rate by 100,000 persons and then compared with the Japanese mortality rate. Furthermore were analyzed the CAR maritime authorities competences and then were compared to that the Japanese counter part. In addition, the implementation rate of the International Maritime Organization (IMO) and International Labor Organization (ILO) conventions ratified by the CAR countries were analyzed. The objective of this research was to compiled and analyze the occurrences of maritime casualties happened on board the ships registered under the CAR Flag States, in order to determine the causes of these accidents. The results of the analysis enable us to better understand of the maritime safety situation of the ships that are registered under the CAR flag States. In order to reduce the occurrence of maritime casualties are proposed a series of measures based on the differences found then the comparison between CAR and Japan. Based on the results of this research, is possible to conclude that the inaccessibility of atmospheric information and the lack of safety measures onboard has been the main cause of the maritime casualties happened in the Pacific side of the CAR.

Central American Region Maritime Organization and their Role in the occurrence of maritime casualties

Oscar PORRAS ROJAS,Hayama IMAZU,Takahiko FUJISAKA 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2006 No.-

Since many years ago and in spite of the existence of national regulations and international conventions ratified by the countries that are conformed the Central American Region (CAR), the seagoing maritime sector of this Region, has developed its activity without any type of safety measures. Therefore, a large number of people are known to die, disappear and suffer from serious injuries each year. These maritime casualties devastate the families affected by these events, and severely impact the local social and economic well-being. While all these accidents occurred in this Region, non government or any other official records are available recording these casualties. Due to the lack of any historical written reports about maritime casualties occurred in this Region, the compilation of this type of accidents information and data was carried out directly by the researchers in the field. Also, all the information about the CAR Maritime Organization Components was too compiled by the authors from the respective National Maritimes Authorities. From the compiled information was elaborated the CAR maritime casualties data base and from the analysis of the above data base were determined the main causes of the maritime accidents occurred in the CAR. The lack of safety measures onboard and the ignorance of the presence and influence of atmospheric phenomena were among main factors that had been caused the maritime casualties in this Region. By other hand, from the analysis of the CAR maritime organization components, the existence of one level of organization very similar among them was determinate. The objective of this research was to analyze the role of the CAR maritime organization in the prevention of the occurrence of maritime casualties. The results of this study provides general understanding of the causes of this type of accidents in the CAR and basis for support in improving safety navigation system and measures so that the number of fatalities and maritime accidents may be reduced in the future.

A-03 : Toward automated wood identification by texture analysis of CT images

( Kayoko Kobayashi ),( Masanori Akada ),( Setsuo Imazu ),( Junji Sugiyama ) 韓國木材工學會 2015 한국목재공학회 학술발표논문집 Vol.2015 No.-

Study on Estimating the Shape of a Ship by Integrating Radar Images

Junya ISHIWATA,Takahiko FUJISAKA,Hayama IMAZU 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2006 No.-

The image of an object obtained by the radar is not corresponding to its true shape, because the image of an object observed by the radar is receiving an influence such as multiple-reflections and expanded in bearing because of the beam width of a radar. In addition, a radio wave does not hit the entire surface of an object. Therefore, the image of the front side of a ship facing a radar antenna corresponds to its true shape. In this paper, a method to estimate a ship’s shape by means of the integration of the front parts of images obtained from radars is proposed. In addition, a matter, which is observation error of each radar, in using multi-radars, and the process included in the proposed method for solving the matter, are described. As a result of the experiment, the accuracy of about 3degrees in ship’s heading and about 14 meters in length and about 9meters in beam was obtained.