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New results on mesonic weak decay of <i>p</i>-shell <i>Λ</i>-hypernuclei
Agnello, M.,Andronenkov, A.,Beer, G.,Benussi, L.,Bertani, M.,Bhang, H.C.,Bonomi, G.,Botta, E.,Bregant, M.,Bressani, T.,Bufalino, S.,Busso, L.,Calvo, D.,Camerini, P.,Dalena, B.,De Mori, F.,D'Erasmo, G. Elsevier 2009 Physics letters: B Vol.681 No.2
<P><B>Abstract</B></P><P>The FINUDA experiment performed a systematic study of the charged mesonic weak decay channel of <I>p</I>-shell <I>Λ</I>-hypernuclei. Negatively charged pion spectra from mesonic decay were measured with magnetic analysis for the first time for <SUP>7</SUP><SUB><I>Λ</I></SUB>Li, <SUP>9</SUP><SUB><I>Λ</I></SUB>Be, <SUP>11</SUP><SUB><I>Λ</I></SUB>B and <SUP>15</SUP><SUB><I>Λ</I></SUB>N. The shape of the <SUP>π−</SUP> spectra was interpreted through a comparison with pion distorted wave calculations that take into account the structure of both hypernucleus and daughter nucleus. Branching ratios <SUB>Γ<SUP>π−</SUP></SUB>/<SUB>Γtot</SUB> were derived from the measured spectra and converted to <SUP>π−</SUP> decay rates <SUB>Γ<SUP>π−</SUP></SUB> by means of known or extrapolated total decay widths <SUB>Γtot</SUB> of <I>p</I>-shell <I>Λ</I>-hypernuclei. Based on these measurements, the spin-parity assignment 1/<SUP>2+</SUP> for <SUP>7</SUP><SUB><I>Λ</I></SUB>Li and 5/<SUP>2+</SUP> for <SUP>11</SUP><SUB><I>Λ</I></SUB>B ground-state are confirmed and a spin-parity 3/<SUP>2+</SUP> for <SUP>15</SUP><SUB><I>Λ</I></SUB>N ground-state is assigned for the first time.</P>
Controlled FEM simulation for determining optimum motion of tools in metal forming
Osakada, K.,Mori, K.,Yang, G.,Wang, C. C. 대한기계학회 1995 International Forum on Advances in Mechanical Engi Vol.1 No.1
A method for determining optimal motion of tools in metal forming processes by using the finite element method is proposed. In this method, the calculated results such as the shape of deforming workpiece, stress, strain, strain rate and velocity are monitored in each deformation step of the finite element simulation, arid the forming motion of the tools is iteratively optimized on the basis of a control scheme referring to the monitored results. The effectiveness of the present method is demonstrated by its application to the determinations of the blank holding force in deep drawing and of the motion of rolls in three-roll bending.
Two competing soft modes and an unusual phase transition in the stuffed tridymite-type oxideBaAl2O4
Ishii, Y.,Mori, S.,Nakahira, Y.,Moriyoshi, C.,Park, J.,Kim, B. G.,Moriwake, H.,Taniguchi, H.,Kuroiwa, Y. American Physical Society 2016 Physical Review B Vol.93 No.13
<P>We investigated the structural phase transition of BaAl2O4, which has a network structure with corner-sharing AlO4 tetrahedra, via synchrotron x-ray thermal diffuse scattering measurements and first-principles calculations. BaAl2O4 shows the structural phase transition at T-C = 451.4 K from the P6(3)22 parent crystal structure to the low-temperature superstructure with a cell volume of 2a x 2b x c. This phase transition is unusual, in which two energetically competing phonon modes at M and K points soften simultaneously. When approaching T-C from above, the K-point mode appears first. However, this K-point mode is overcome by the later-developed M-point mode. The thermal diffuse scattering intensities from both modes increase sharply at T-C; therefore, both modes soften simultaneously. The first-principles calculations demonstrate that the M-point mode is electrostatically more preferable than the K-point mode and determines the eventual low-temperature structure, although these two modes are competing energetically. This competition is characteristic of BaAl2O4, which is ascribed to the structurally flexible network structure of this compound.</P>
Corrosion Fatigue of Austenitic Stainless Steel in Different Hot Chloride Solutions
( A. Visser ),( G. Mori ),( M. Panzenbock ),( R. Pippan ) 한국부식방식학회(구 한국부식학회) 2015 Corrosion Science and Technology Vol.14 No.4
Austenitic stainless steel was investigated under cyclic loading in electrolytes with different chloride contents and pH and at different temperatures. The testing solutions were 13.2 % NaCl (80,000 ppm Cl-) at 80 ¡ÆC and 43 % CaCl2 (275,000 ppm Cl-) at 120 ¡ÆC. In addition to S.N curves in inert and corrosive media, the fracture surfaces were investigated with a scanning electron microscope (SEM) to analyse the type of attack. The experimental results showed that a sharp decrease in corrosion fatigue properties can be correlated with the occurrence of stress corrosion cracking. The correlation of occurring types of damage in different corrosion systems is described.
Accelerated SCC Testing of Stainless Steels According to Corrosion Resistance Classes
( M Borchert ),( G Mori ),( M Bischof ),( A Tomandl ) 한국부식방식학회(구 한국부식학회) 2015 Corrosion Science and Technology Vol.14 No.6
The German Guidelines for stainless steel in buildings (Z. 30. 3-6) issued by the German Institute for Building Technology (DIBt) categorizevarious stainless steel grades into five corrosion resistance classes (CRCs). Only 21 frequently used grades are approved and assigned to these CRCs. To assign new or less commonly used materials, a large program of outdoor exposure tests and laboratory tests is required. The present paper shows theresults of stress corrosion cracking (SCC) tests that can distinguish between different CRCs. Slow strain rate tests (SSRT) were performedin various media and at different temperatures. CRC IV could be distinguished from CRC II and CRC III with a 31. 3 % Cl- as MgCl2 solutionat 140 °C. CRC II and CRC III could be differentiated by testing in a 30% Cl- as MgCl2 solutionat 100 °C.
Park, J.,Kim, B.G.,Mori, S.,Oguchi, T. Academic Press 2016 Journal of solid state chemistry Vol.235 No.-
<P>The properties of a tetrahedron containing Bi(2)AO(5) (A=Si, Ge) are examined using Ab initio calculations and symmetry mode analysis. Stabilization of the polar phase is observed in both compounds with a monoclinic Cc phase. In the monoclinic ground state, the tilting angle (phi(1)) of tetrahedron is 7.21 degrees and 21.94 degrees for the Si and Ge compound, respectively. The relationship between a primary order parameter and the tetrahedral tilting is identified and an analytical formula between them is proposed by analyzing the structure. The detailed layer-by-layer polarization calculations shows that the main polarization component originates from the tetrahedron tilting of the AO(4) unit, and the analytical relationship between the primary order parameter and spontaneous polarization is also calculated. This B3LYP hybrid functional calculation provides a band gap of 4.44 eV and 4.18 eV for Bi2SiO5 and Bi2GeO5, respectively. The main difference between the two compounds is also analyzed based on the electronic structure and electron localization function analysis. (C) 2015 Elsevier Inc. All rights reserved.</P>
Geo-Tracking of Mushroom Pharming in Nueva Ecija, Central Luzon Region, Philippines
Ariel Joseph J. Barza,Sofronio P. Kalaw,Ryo Sumi,Nobuo Mori,Renato G. Reyes,Noriko Miyazawa,Fumio Eguchi 한국버섯학회 2017 버섯 Vol.21 No.2
Nueva Ecija is a landlocked province in Central Luzon region that is composed of 27 municipalities and 5 cities. It is a province that is rich with biodiversity on its north and east borders, which exhibit a shared ecosystem with the Caraballo mountain range in the north and the Sierra Madre mountain range in the east. Its main economic activity is farming where rice is the main crop. Part of the Sierra Madre mountain range traverses its towns of Bongabon, Laur, Rizal and Pantabangan where most of the locals perform agro – forestry activities as a means of generating income for their families. Due to the accumulation of farm residues as a result of intensive agro-forestry activities, mushroom pharming becomes a very viable agribusiness undertaking in the area. Our research team initiated the establishment of database by tracking the mushroom production activities in the province. Similarly, the prevailing climatic condition in the geographical area and the type of agro-forestry wastes have been tracked. Wastes as a result of intensive agro – forestry activities are being generated which the locals oftentimes burned in the field that posed hazard to the environment. In order to discourage this practice, our research team generated technologies on mushroom pharming using rice straw as the main substrate. The promotion of mushroom pharming is based on the suitability of mushroom species to grow in climatic conditions that prevail in the specific geographical area in the province. As a result of its collaborative research undertakings, the Center for Tropical Mushroom Research and Development of the Central Luzon State University in collaboration with the Laboratory of Forest Products Chemistry of Tokyo University of Agriculture and the Nikken Sohonsha Corporation encouraged the adoption of medicinal mushroom production technologies on rice straw – based formulation. With oyster mushroom (Pleurotus spp) as the most widely cultivated mushroom among the mushroom growers in the province, other ligninolytic mushrooms such as lacquered mushroom (Ganoderma) and wood ear mushroom (Auricularia spp.) are grown by the locals. Similarly, leaf – litter degrading mushrooms such as paddy straw mushroom (Volvariella volvacea) are also being cultivated in the province. However, some mushroom growers in the province adopt sawdust – based mushroom production technology which is not economically appropriate in the province due to the scarcity of its availability compared to rice straw. Majority of the mushroom growers in the province adopt the rice straw – based mushroom technology. Moreover, high value mushroom – based products other than the fresh mushrooms are already in the local market.