Symmetry breaking in quantum curves and super Chern-Simons matrix models

Kubo, Naotaka,Moriyama, Sanefumi,Nosaka, Tomoki Springer-Verlag 2019 Journal of high energy physics Vol.2019 No.1

The First Report of Hepatozoon Species Infection in Leopard Cats (Prionailurus bengalensis) in Korea

Kubo, M.,Jeong, A.,Kim, S.-I.,Kim, Y.-J.,Lee, H.,Kimura, J.,Agatsuma, T.,Sakai, H.,Yanai, T. JOURNAL OF PARASITOLOGY 2010 The Journal of parasitology Vol.96 No.2

Hydroxide ion Conduction Mechanism in Mg-Al CO₃^2- Layered Double Hydroxide

Kubo, Daiju,Tadanaga, Kiyoharu,Hayashi, Akitoshi,Tatsumisago, Masahiro The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.2

Ionic conduction mechanism of Mg-Al layered double hydroxides (LDHs) intercalated with CO₃^2- (Mg-Al CO₃^2- LDH) was studied. The electromotive force for the water vapor concentration cell using Mg-Al CO₃^2- LDH as electrolyte showed water vapor partial pressure dependence and obeyed the Nernst equation, indicating that the hydroxide ion transport number of Mg-Al CO₃^2- LDH is almost unity. The ionic conductivity of Mg(OH)₂, MgCO₃ and Al₂(CO₃)₃ was also examined. Only Al₂(CO₃)₃ showed high hydroxide ion conductivity of the order of 10^-4 S cm^-1 under 80% relative humidity, suggesting that Al₂(CO₃)₃ is an ion conducting material and related to the generation of carrier by interaction with water. To discuss the ionic conduction mechanism, Mg-Al CO₃^2- LDH having deuterium water as interlayer water (Mg-Al CO₃^2- LDH(D₂O)) was prepared. After the adsorbed water molecules on the surface of Mg-Al CO₃^2- LDH(D₂O) were removed by drying, DC polarization test for dried Mg-Al CO₃^2- LDH(D₂O) was examined. The absorbance attributed to O-D-stretching band for Mg-Al CO₃^2- LDH(D₂O) powder at around the positively charged electrode is larger than that before polarization, indicating that the interlayer in Mg-Al CO₃^2- LDH is a hydroxide ion conduction channel.

Development of FEMAXI-ATF for analyzing PCMI behavior of SiC cladded fuel under power ramp conditions

Kubo Yoshihiro,Yamaji Akifumi 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.3

FEMAXI-ATF is being developed for fuel performance modeling of SiC cladded UO2 fuel with focuses on modeling pellet-cladding mechanical interactions (PCMI). The code considers probability distributions of mechanical strengths of monolithic SiC (mSiC) and SiC fiber reinforced SiC matrix composite (SiC/SiC), while it models pseudo-ductility of SiC/SiC and propagation of cladding failures across the wall thickness direction in deterministic manner without explicitly modeling cracks based on finite element method in one-dimensional geometry. Some hypothetical BWR power ramp conditions were used to test sensitivities of different model parameters on the analyzed PCMI behavior. The results showed that propagation of the cladding failure could be modeled by appropriately reducing modulus of elasticities of the failed wall element, so that the mechanical load of the failed element could be re-distributed to other intact elements. The probability threshold for determination of the wall element failure did not have large influence on the predicted power at failure when the threshold was varied between 25 % and 75 %. The current study is still limited with respect to mechanistic modeling of SiC failure as it only models the propagation of the cladding wall element failure across the homogeneous continuum wall without considering generations and propagations of cracks.

The Influence of Tsunamis on Moored Ships and Ports

Kubo Masayoshi,Cho Ik-Soon,Sakakibara Shigeki,Kobayashi Eiichi,Koshimura Syunichi Korean Institute of Navigation and Port Research 2005 한국항해항만학회지 Vol.29 No.4

Planning for the construction of ports and harbors usually takes place without the consideration of tsunamis because of their rare occurrence, approximately once every 100 years. However, recent warnings indicate that massive earthquakes could occur in Japan within the next 30 years. Earthquakes may generate large-scale tsunamis. Therefore, any tsunamis in the vicinity of Japan would also be expected to affect eastern Korea. Therefore, with the looming concerns of tsunamis and earthquakes, immediate attention must be given to the planning of ports and harbors. The warnings deserve an immediate response. The threatened regions cover a very large territory, and the degree of severity of the tsunamis is forecasted to be varied. Therefore, any modeling of the potential scenarios will require a broad array of possibilities. The objective of this paper is to consider the potential damage from tsunamis to ports and moored ships in Japan and Korea. In addition, consideration will be given to how the construction plans of ports and harbors should be changed to cope with the threats from earthquakes and tsunamis.

Lipoxygenase inhibitory activity of 6-pentadecanylsalicylic acid without prooxidant effect.

Kubo, Isao,Ha, Tae Joung,Shimizu, Kuniyoshi Natural Product Communications 2010 Natural product communications Vol.5 No.1

<P>6-Pentadecanylsalicylic acid, referred to as anacardic acid (C15:0), was found to inhibit the linoleic acid peroxidation competitively catalyzed by soybean lipoxygenase-1 (EC 1.13.11.12, Type 1) with an IC50 of 14.3 microM (4.88 microg/mL). This inhibition is a reversible reaction without pro-oxidant effects. The inhibition kinetics analyzed by Dixon plots indicates that anacardic acid (C15:0) is a competitive inhibitor and the inhibition constant, KI, was established as 6.4 microM. The hydrophilic head (salicylic acid) portion first chelates the iron in the active site and then the hydrophobic tail portion begins reversibly interacting with the C-terminal domain where the iron is located. The inhibition of anacardic acid (C15:0) can be explained by a combination of iron ion-chelation and hydrophobic interaction abilities because of its specific structural feature.</P>

기술시험위성 9호기의 광 피더 링크 시스템 개발과 이후의 전망

Kubo-oka, Toshihiro,Munemasa, Yasushi 한국광학기기산업협회 2019 光學世界 Vol.175 No.-

A Simple Polymerase Chain Reaction-based Method for the Discrimination of Three Chicken Breeds

Kubo, Y.,Plastow, G.,Mitsuhashi, Tadayoshi Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.9

A large number of branded chicken products exist in Japan, and in some cases, the breed of chicken is an important factor used to attract consumer interest in the retail product. In order to establish a simple method for verifying such breed claims we applied the amplified fragment length polymorphism (AFLP) technique to nine chicken breeds (White Cornish, Red Cornish, White Plymouth Rock, New Hampshire, Rhode Island Red, Barred Plymouth Rock, Hinaidori, Tosajidori, Tsushimajidori) to search for molecular markers able to discriminate chicken breeds. Three breed-specific single nucleotide polymorphisms (SNP) were identified, one for each of Hinaidori, Tosajidori, or New Hampshire. A total of 219 individuals from the nine breeds were analyzed using a specific PCR test for each of these SNP. The PCR tests made it possible to discriminate between the breeds of chickens to identify products from these three breeds. This PCR method provides an efficient method for the routine analysis and verification of certified chicken products.

A SEISMIC DESIGN OF NUCLEAR REACTOR BUILDING STRUCTURES APPLYING SEISMIC ISOLATION SYSTEM IN A HIGH SEISMICITY REGION -A FEASIBILITY CASE STUDY IN JAPAN

Kubo, Tetsuo,Yamamoto, Tomofumi,Sato, Kunihiko,Jimbo, Masakazu,Imaoka, Tetsuo,Umeki, Yoshito Korean Nuclear Society 2014 Nuclear Engineering and Technology Vol.46 No.5

A feasibility study on the seismic design of nuclear reactor buildings with application of a seismic isolation system is introduced. After the Hyogo-ken Nanbu earthquake in Japan of 1995, seismic isolation technologies have been widely employed for commercial buildings. Having become a mature technology, seismic isolation systems can be applied to NPP facilities in areas of high seismicity. Two reactor buildings are discussed, representing the PWR and BWR buildings in Japan, and the application of seismic isolation systems is discussed. The isolation system employing rubber bearings with a lead plug positioned (LRB) is examined. Through a series of seismic response analyses using the so-named standard design earthquake motions covering the design basis earthquake motions obtained for NPP sites in Japan, the responses of the seismic isolated reactor buildings are evaluated. It is revealed that for the building structures examined herein: (1) the responses of both isolated buildings and isolating LRBs fulfill the specified design criteria; (2) the responses obtained for the isolating LRBs first reach the ultimate condition when intensity of motion is 2.0 to 2.5 times as large as that of the design-basis; and (3) the responses of isolated reactor building fall below the range of the prescribed criteria.

A Seismic Design of Nuclear Reactor Building Structures Applying Seismic Isolation System in a High Seismicity Region –A Feasibility Case Study in Japan-

TETSUO KUBO,TOMOFUMI YAMAMOTO,KUNIHIKO SATO,MASAKAZU JIMBO,TETSUO IMAOKA,YOSHITO UMEKI 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.5

A feasibility study on the seismic design of nuclear reactor buildings with application of a seismic isolation systemis introduced. After the Hyogo-ken Nanbu earthquake in Japan of 1995, seismic isolation technologies have been widelyemployed for commercial buildings. Having become a mature technology, seismic isolation systems can be applied toNPP facilities in areas of high seismicity. Two reactor buildings are discussed, representing the PWR and BWR buildingsin Japan, and the application of seismic isolation systems is discussed. The isolation system employing rubber bearingswith a lead plug positioned (LRB) is examined. Through a series of seismic response analyses using the so-named standarddesign earthquake motions covering the design basis earthquake motions obtained for NPP sites in Japan, the responsesof the seismic isolated reactor buildings are evaluated. It is revealed that for the building structures examined herein: (1)the responses of both isolated buildings and isolating LRBs fulfill the specified design criteria; (2) the responses obtainedfor the isolating LRBs first reach the ultimate condition when intensity of motion is 2.0 to 2.5 times as large as that of thedesign-basis; and (3) the responses of isolated reactor building fall below the range of the prescribed criteria.