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      • KCI등재
      • KCI등재

        Mechanical robustness of AREVA NP's GAIA fuel design under seismic and LOCA excitations

        Brian Painter,Brett Matthews,Pierre-Henri Louf,Herve Lebail,Veit Marx 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.2

        Recent events in the nuclear industry have resulted in a movement towards increased seismic and LOCAexcitations and requirements that challenge current fuel designs. AREVA NP's GAIA fuel design introducesunique and robust characteristics to resist the effects of seismic and LOCA excitations. For demanding seismic and LOCA scenarios, fuel assembly spacer grids can undergo plastic deformations. These plastic deformations must not prohibit the complete insertion of the control rod assembliesand the cooling of the fuel rods after the accident. The specific structure of the GAIA spacer gridproduces a unique and stable compressive deformation mode which maintains the regular array of thefuel rods and guide tubes. The stability of the spacer grid allows it to absorb a significant amount ofenergy without a loss of load-carrying capacity. The GAIA-specific grid behavior is in contrast to the typical spacer grid, which is characterized by abuckling instability. The increased mechanical robustness of the GAIA spacer grid is advantageous inmeeting the increased seismic and LOCA loadings and the associated safety requirements. The uniqueGAIA spacer grid behavior will be incorporated into AREVA NP's licensed methodologies to take fullbenefit of the increased mechanical robustness

      • Semi-Retractable Current Lead Cooled by a Cryocooler for High Field Magnet

        Choi, Y.S.,Painter, T.A.,Kim, D.L.,Yang, H.S.,Lee, B.S. IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3

        <P>The semi-retractable current lead cooled by a cryocooler is designed for a high field superconducting magnet system. The semi-retractable current lead is composed of a normal metal element, conducting the current from room temperature to an intermediate temperature, and an HTS element, conducting the current down to liquid helium temperature. An HTS element and the joint between the normal metal and HTS element are connected to a two-stage cryocooler. The intermediate joint carries current through a strip of louvered material. After charging the normal metal element is disengaged from the HTS element without breaking vacuum in the insulating space. The semi-retractable current lead is fabricated and assembled with a two-stage cryocooler for feasibility test. The adaptability and reliability of the lead are tested during engage and disengage performance. The electrical contact resistance is also measured in the intermediate joint with respect to the vacuum level and temperature has been measured.</P>

      • Semi-Retractable Current Leads for a 21 T FT-ICR Magnet System

        Choi, Y.S.,Painter, T.A.,Kim, D.L.,Bole, S.T.,Adkins, T. IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2

        <P>The development of the semi-retractable current leads for a 21 T Fourier transform ion cyclotron resonance (FT-ICR) superconducting magnet system is presented. The semi-retractable current leads are composed of a normal metal element, conducting the current from room temperature to intermediate temperature, and an HTS element, conducting the current down to liquid helium temperature. An HTS element is partly immersed in liquid helium and the joint between the normal metal and HTS element is continuously refrigerated by a cryocooler. After magnet energization the metal element is disengaged from the HTS element without breaking vacuum to the insulating vacuum space. In the paper, the optimized dimensions of the leads are presented in order to minimize the thermal heat load when carrying operational current with some margin. The intermediate block with a lockable set point and the insulating vacuum system are fabricated and the adaptability and reliability are tested during engage and disengage performance. The effects of vacuum level and performance cycle on the electrical contact resistance in a lockable set are also investigated.</P>

      • KCI등재

        Ectosymbionts of the Sea Anemone Stichodactyla gigantea at Kosrae, Micronesia

        Hayes, Floyd E.,Painter, Brandon J. The Korean Society of Systematic Zoology 2016 Animal Systematics, Evolution and Diversity Vol.32 No.2

        We studied the ectosymbionts associating with the sea anemone Stichodactyla gigantea at Kosrae, Micronesia. Ectosymbionts of seven species associated with 60.7% of S. gigantea (n=28), with a mean of 2.4 per anemone and 3.9 per occupied anemone. Anemones hosting one or more ectosymbionts did not differ significantly in size from anemones lacking ectosymbionts and there was no significant correlation between anemone size and the number of ectosymbionts. Of 67 ectosymbionts observed, the sea cucumber Stichopus vastus comprised 23.9%, followed by the shrimp Thor amboinensis (20.9%), unidentified hermit crabs (Paguroidea; 20.9%), the cardinalfish Ostorhinchus novemfasciatus (20.9%), the shrimp Periclimenes brevicarpalis (9.0%), the sea cucumber Holothuria hilla (3.0%), and an unidentified brachyuran crab (1.5%). This study documents the first records of S. vastus, H. hilla, and O. novemfasciatus associating with S. gigantea, and the first locality records of S. gigantea, T. amboinensis, P. brevicarpalis, and S. vastus for Kosrae. Because humans often harvest S. gigantea for food at Kosrae, we recommend protecting the symbiotic assemblage of S. gigantea by establishing a sustainable system of harvesting.

      • SCOPUSKCI등재
      • KCI등재

        A Comprehensive review of raisins and raisin components and their relationship to human health

        Schuster, Margaret J,Wang, Xinyue,Hawkins, Tiffany,Painter, James E 한국영양학회 2017 Journal of Nutrition and Health Vol.50 No.3

        Purpose: This literature review was performed to assess the effect of raisins on human health. Methods: A review of Medline was conducted using the keywords: ‘raisins, raisins and health, raisins and cardiovascular disease (CVD), raisins and cancer, raisins and diabetes, raisins and fiber, raisins and colon health, raisins and antioxidants, raisins and inflammation, raisins and dental caries’. The reference lists from previous review articles on raisins and human health and the California Raisin Marketing Board files were reviewed for additional studies. Results: Raisins have one of the highest polyphenolic content and antioxidant ORAC levels compared to other traditional dried fruits. Many of the polyphenols in raisins are well assimilated and bioavailable. Raisin consumption reduces low density lipoprotein (LDL) cholesterol, blood pressure and blood sugar, when compared to equal caloric carbohydrate snacks and is associated with a reduced risk of CVD. The anti-inflammatory and cancer chemopreventive effects of raisins are mixed. Raisin consumption reduces intestinal transit time and positively affects gut microbiota. Raisins produce sustained energy during long term athletic competitions equal to traditional sports energy gels, shots and jelly beans. Raisins produce a non-cariogenic oral environment and do not fit the American Academy of Pediatrics criteria to be considered a choking hazard. Conclusions: Based on the review of literature, consumption of raisins provide numerous health benefits for promoting general wellness and in the prevention of many chronic diseases including: CVD, type 2 diabetes mellitus (T2DM) gastrointestinal diseases, and dental caries.

      • KCI등재

        Determinants of German and Japanese Exports: A Comparative Study

        George K. Zestos,Yixiao Jiang,Clifton Painter 세종대학교 경제통합연구소 2021 Journal of Economic Integration Vol.36 No.3

        This study investigates the determinants of German and Japanese exports in a comparative fashion. By estimating an autoregressive distributed lag model for each country, we find that the income elasticity of Japanese exports is three times as large as that of Germany’s exports. This relative insensitivity to external demand explains why Germany has maintained its export growth whereas Japanese exports started to stagnate after the global financial crisis. Because Germany adopted the euro in 1999, it was able to maintain large trade surpluses. If Germany had instead kept the Deutsche Mark (DM), the DM would have appreciated owing to the Central Bank of Germany’s consistent preference for a tight monetary policy, and Germany’s trade surpluses would have dissipated. A sharp increase in Japanese foreign direct investment after 2011 has also played a role in reducing Japanese exports after the global financial crisis.

      • KCI등재

        Ectosymbionts of the Sea Anemone Stichodactyla gigantea at Kosrae, Micronesia

        Floyd E. Hayes,Brandon J. Painter 한국동물분류학회 2016 Animal Systematics, Evolution and Diversity Vol.32 No.2

        We studied the ectosymbionts associating with the sea anemone Stichodactyla gigantea at Kosrae, Micronesia. Ectosymbionts of seven species associated with 60.7% of S. gigantea (n=28), with a mean of 2.4 per anemone and 3.9 per occupied anemone. Anemones hosting one or more ectosymbionts did not differ significantly in size from anemones lacking ectosymbionts and there was no significant correlation between anemone size and the number of ectosymbionts. Of 67 ectosymbionts observed, the sea cucumber Stichopus vastus comprised 23.9%, followed by the shrimp Thor amboinensis (20.9%), unidentified hermit crabs (Paguroidea; 20.9%), the cardinalfish Ostorhinchus novemfasciatus (20.9%), the shrimp Periclimenes brevicarpalis (9.0%), the sea cucumber Holothuria hilla (3.0%), and an unidentified brachyuran crab (1.5%). This study documents the first records of S. vastus, H. hilla, and O. novemfasciatus associating with S. gigantea, and the first locality records of S. gigantea, T. amboinensis, P. brevicarpalis, and S. vastus for Kosrae. Because humans often harvest S. gigantea for food at Kosrae, we recommend protecting the symbiotic assemblage of S. gigantea by establishing a sustainable system of harvesting.

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