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        • Compressible Navier--Stokes System with General Inflow-Outflow Boundary Data

          Chang, T.,Jin, B.J.,Novotný,, A. Society for Industrial and Applied Mathematics 2019 SIAM journal on mathematical analysis Vol.51 No.2

          <P>We prove existence of weak solutions to the compressible Navier--Stokes equations in a barotropic regime (adiabatic coefficient <TEX>$\gamma>3/2$</TEX> in three dimensions, <TEX>$\gamma>1$</TEX> in two dimensions) with large velocity prescribed at the boundary and large density prescribed at the inflow boundary of a bounded sufficiently smooth domain, without any restriction on either the shape of the inflow/outflow boundaries or the shape of the domain. The result applies also to pressure laws that are nonmonotone on a compact portion of the interval <TEX>$[0,\infty)$</TEX>.</P>

        • KCI등재

          Impact of thermal and chemical treatment on the mechanical properties of E110 and E110G cladding tubes

          M. Kir aly,Z. Hozer,M. Horvath,T. Novotny,E. Perez-Fero,N. Ver 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.2

          The mechanical and corrosion behavior of the Russian zirconium fuel cladding alloy E110, predominantlyused in VVERs, has been investigated for many decades. The recent commercialization of a new, optimizedE110 alloy, produced on a sponge zirconium basis, gave the opportunity to compare the mechanicalproperties of the old and the new E110 fuel claddings. Axial and tangential tensile test experiments were performed with samples from both claddings in theMTA EK. Due to the anisotropy of the cladding tubes, the axial tensile strength was 10e15% higher thanthe tangential (measured by ring tensile tests). The tensile strength of the new E110G alloy was 11%higher than that of the E110 cladding at room temperature. Some samples underwent chemical treatment e slight oxidation in steam or hydrogenation e or heattreatment e in argon atmosphere at temperatures between 600 and 1000 C. The heat treatment duringthe oxidation had more significant effect on the tensile strength of the claddings than the oxidation itself,which lowered the tensile strength as the thickness of the metal decreased. The hydrogenation of thecladding samples slightly lowered the tensile strength and the samples but they remained ductile even atroom temperature.

        • SCIESCOPUSKCI등재

          Impact of thermal and chemical treatment on the mechanical properties of E110 and E110G cladding tubes

          Kiraly, M.,Hozer, Z.,Horvath, M.,Novotny, T.,Perez-Fero, E.,Ver, N. Korean Nuclear Society 2019 Nuclear Engineering and Technology Vol.51 No.2

          The mechanical and corrosion behavior of the Russian zirconium fuel cladding alloy E110, predominantly used in VVERs, has been investigated for many decades. The recent commercialization of a new, optimized E110 alloy, produced on a sponge zirconium basis, gave the opportunity to compare the mechanical properties of the old and the new E110 fuel claddings. Axial and tangential tensile test experiments were performed with samples from both claddings in the MTA EK. Due to the anisotropy of the cladding tubes, the axial tensile strength was 10-15% higher than the tangential (measured by ring tensile tests). The tensile strength of the new E110G alloy was 11% higher than that of the E110 cladding at room temperature. Some samples underwent chemical treatment - slight oxidation in steam or hydrogenation - or heat treatment - in argon atmosphere at temperatures between 600 and $1000^{\circ}C$. The heat treatment during the oxidation had more significant effect on the tensile strength of the claddings than the oxidation itself, which lowered the tensile strength as the thickness of the metal decreased. The hydrogenation of the cladding samples slightly lowered the tensile strength and the samples but they remained ductile even at room temperature.

        • Bioimpedence to Assess Breast Density as a Risk Factor for Breast Cancer in Adult Women and Adolescent Girls

          Maskarinec, Gertraud,Morimoto, Yukiko,Laguana, Michelle B,Novotny, Rachel,Guerrero, Rachael T Leon Asian Pacific Organization for Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.1

          Although high mammographic density is one of the strongest predictors of breast cancer risk, X-ray based mammography cannot be performed before the recommended screening age, especially not in adolescents and young women. Therefore, new techniques for breast density measurement are of interest. In this pilot study in Guam and Hawaii, we evaluated a radiation-free, bioimpedance device called Electrical Breast Densitometer$^{TM}$ (EBD; senoSENSE Medical Systems, Inc., Ontario, Canada) for measuring breast density in 95 women aged 31-82 years and 41 girls aged 8-18 years. Percent density (PD) was estimated in the women's most recent mammogram using a computer-assisted method. Correlation coefficients and linear regression were applied for statistical analysis. In adult women, mean EBD and PD values of the left and right breasts were $230{\pm}52$ and $226{\pm}50{\Omega}$ and $23.7{\pm}15.1$ and $24.2{\pm}15.2%$, respectively. The EBD measurements were inversely correlated with PD ($r_{Spearman}=-0.52$, p<0.0001); the correlation was stronger in Caucasians ($r_{Spearman}=-0.70$, p<0.0001) than Asians ($r_{Spearman}=-0.54$, p<0.01) and Native Hawaiian/Chamorro/Pacific Islanders ($r_{Spearman}=-0.34$, p=0.06). Using 4 categories of PD (<10, 10-25, 26-50, 51-75%), the respective mean EBD values were $256{\pm}32$, $249{\pm}41$, $202{\pm}46$, and $178{\pm}43{\Omega}$ (p<0.0001). In girls, the mean EBD values in the left and right breast were $148{\pm}40$ and $155{\pm}54{\Omega}$; EBD values decreased from Tanner stages 1 to 4 ($204{\pm}14$, $154{\pm}79$, $136{\pm}43$, and $119{\pm}16{\Omega}$ for stages 1-4, respectively) but were higher at Tanner stage 5 ($165{\pm}30{\Omega}$). With further development, this bioimpedance method may allow for investigations of breast development among adolescent, as well as assessment of breast cancer risk early in life and in populations without access to mammography.

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