The Experts below are selected from a list of 22410 Experts worldwide ranked by ideXlab platform
Yufeng Feng - One of the best experts on this subject based on the ideXlab platform.
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Alteration of leaf shape, improved metal tolerance, and productivity of seed by overexpression of CsHMA3 in Camelina sativa
Biotechnology for Biofuels, 2014Co-Authors: Won Park, Yufeng FengAbstract:Background Camelina sativa (L.) Crantz, known by such popular names as “gold-of-pleasure” and “false flax,” is an alternative oilseed crop for biofuel production and can be grown in harsh environments. Considerable interest is now being given to the new concept of the development of a Fusion Plant which can be used as a soil remediation Plant for ground contaminated by heavy metals as well as a bioenergy crop. However, knowledge of the transport processes for heavy metals across Camelina Plant membranes is still rudimentary. Results Firstly, to investigate whether Camelina HMA (heavy metal P_1B-ATPase) genes could be used in such a Plant, we analyzed the expression patterns of eight HMA genes in Camelina (taken from the root, leaf, stem, flower, and silique). CsHMA3 genes were expressed in all organs. In addition, CsHMA3 was induced in roots and leaves especially after Pb treatment. Heterogeneous expression of CsHMA3 complemented the Pb- or Zn-sensitive phenotype of Δycf1 or Δzrc1 yeast mutant strains. Subsequently, we cloned and overexpressed CsHMA3 in Camelina . The root growth of transgenic lines was better than that in the wild-type Plant under heavy metal stress (for Cd, Pb, and Zn). In particular, the transgenic lines showed enhanced Pb tolerance in a wide range of Pb concentrations. Furthermore, the Pb and Zn content in the shoots of the transgenic lines were higher than those in the wild-type Plant. These results suggest that overexpression of CsHMA3 might enhance Pb and Zn tolerance and translocation. Also, the transgenic lines displayed a wider leaf shape compared with the wild-type Plant due to an induction of genes related to leaf width growth and showed a greater total seed yield compared to the wild type under heavy metal stress. Conclusions Our data obtained from physiological and functional analyses using CsHMA3 overexpression Plants will be useful to develop a multifunctional Plant that can improve the productivity of a bioenergy crop and simultaneously be used to purify an area contaminated by various heavy metals.
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Alteration of leaf shape, improved metal tolerance, and productivity of seed by overexpression of CsHMA3 in Camelina sativa.
Biotechnology for Biofuels, 2014Co-Authors: Won Park, Yufeng Feng, Sung-ju AhnAbstract:Background Camelina sativa (L.) Crantz, known by such popular names as “gold-of-pleasure” and “false flax,” is an alternative oilseed crop for biofuel production and can be grown in harsh environments. Considerable interest is now being given to the new concept of the development of a Fusion Plant which can be used as a soil remediation Plant for ground contaminated by heavy metals as well as a bioenergy crop. However, knowledge of the transport processes for heavy metals across Camelina Plant membranes is still rudimentary.
Won Park - One of the best experts on this subject based on the ideXlab platform.
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Alteration of leaf shape, improved metal tolerance, and productivity of seed by overexpression of CsHMA3 in Camelina sativa
Biotechnology for Biofuels, 2014Co-Authors: Won Park, Yufeng FengAbstract:Background Camelina sativa (L.) Crantz, known by such popular names as “gold-of-pleasure” and “false flax,” is an alternative oilseed crop for biofuel production and can be grown in harsh environments. Considerable interest is now being given to the new concept of the development of a Fusion Plant which can be used as a soil remediation Plant for ground contaminated by heavy metals as well as a bioenergy crop. However, knowledge of the transport processes for heavy metals across Camelina Plant membranes is still rudimentary. Results Firstly, to investigate whether Camelina HMA (heavy metal P_1B-ATPase) genes could be used in such a Plant, we analyzed the expression patterns of eight HMA genes in Camelina (taken from the root, leaf, stem, flower, and silique). CsHMA3 genes were expressed in all organs. In addition, CsHMA3 was induced in roots and leaves especially after Pb treatment. Heterogeneous expression of CsHMA3 complemented the Pb- or Zn-sensitive phenotype of Δycf1 or Δzrc1 yeast mutant strains. Subsequently, we cloned and overexpressed CsHMA3 in Camelina . The root growth of transgenic lines was better than that in the wild-type Plant under heavy metal stress (for Cd, Pb, and Zn). In particular, the transgenic lines showed enhanced Pb tolerance in a wide range of Pb concentrations. Furthermore, the Pb and Zn content in the shoots of the transgenic lines were higher than those in the wild-type Plant. These results suggest that overexpression of CsHMA3 might enhance Pb and Zn tolerance and translocation. Also, the transgenic lines displayed a wider leaf shape compared with the wild-type Plant due to an induction of genes related to leaf width growth and showed a greater total seed yield compared to the wild type under heavy metal stress. Conclusions Our data obtained from physiological and functional analyses using CsHMA3 overexpression Plants will be useful to develop a multifunctional Plant that can improve the productivity of a bioenergy crop and simultaneously be used to purify an area contaminated by various heavy metals.
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Alteration of leaf shape, improved metal tolerance, and productivity of seed by overexpression of CsHMA3 in Camelina sativa.
Biotechnology for Biofuels, 2014Co-Authors: Won Park, Yufeng Feng, Sung-ju AhnAbstract:Background Camelina sativa (L.) Crantz, known by such popular names as “gold-of-pleasure” and “false flax,” is an alternative oilseed crop for biofuel production and can be grown in harsh environments. Considerable interest is now being given to the new concept of the development of a Fusion Plant which can be used as a soil remediation Plant for ground contaminated by heavy metals as well as a bioenergy crop. However, knowledge of the transport processes for heavy metals across Camelina Plant membranes is still rudimentary.
P F Uxto - One of the best experts on this subject based on the ideXlab platform.
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heat deposition into the superconducting central column of a spherical tokamak Fusion Plant
Nuclear Fusion, 2015Co-Authors: C G Windso, J G Morga, P F UxtoAbstract:A key challenge in designing a Fusion power Plant is to manage the heat deposition into the central core containing superconducting toroidal field coils. Spherical tokamaks have limited space for shielding the central core from fast neutrons produced by Fusion and the resulting gamma rays. This paper reports a series of three-dimensional computations using the Monte Carlo N-particle code to calculate the heat deposition into the superconducting core. For a given Fusion power, this is considered as a function of plasma major radius R0, core radius rsc and shield thickness d. Computations over the ranges 0.6 m ≤ R0 ≤ 1.6 m, 0.15 m ≤ rsc ≤ 0.25 m and 0.15 m ≤ d ≤ 0.4 m are presented. The deposited power shows an exponential dependence on all three variables to within around 2%. The additional effects of source profile, the outer shield and shield material are all considered. The results can be interpolated to 2% accuracy and have been successfully incorporated into a system code. A possible pilot Plant with 174 MW of Fusion is shown to lead to a heat deposition into the superconducting core of order 30 kW. An estimate of 1.7 MW is made for the cryogenic Plant power necessary for heat removal, and of 88 s running time for an adiabatic experiment where the heat deposition is absorbed by a 10 K temperature rise.
Klaus Leinemann - One of the best experts on this subject based on the ideXlab platform.
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KISMET BASED MULTIMEDIA WORKSTATION FOR OPERATIONAL SUPPORT IN Fusion Plant REMOTE MAINTENANCE
Fusion Technology 1992, 1993Co-Authors: Klaus Leinemann, U. Kühnapfel, F. Katz, H. Knüppcl, H.-g. Krumm, W. OlbrichAbstract:CAD-model based, real-time simulation and synthetic viewing systems are now well accepted as powerful software tools for planning, programming, and online control of remote handling tasks. The realtime robotics simulation system KISMET, which is used at JET and in the KfK-EDITH experiment, is such a tool. The simulation accuracy in KISMET has been improved by realtime calculation of elastostatic effects and of the dynamic behaviour of mechanisms. To support the operator not only in the spatial domain but also in the procedural and functional domain, two new systems are under development: the procedural support system PEXOS leads the operator step by step through a network of maintenance actions and states offering multi-medial informations, the functional support system FEMOS covers the aspects and needs of direct maintenance device operation. The integration of those three systems forms the multimedia workstation, providing multi-level access to the remote handling devices and multi-level support in all phases of remote maintenance. The prototypic workstation will be applied to the KfK-EDITH experimental device for in-torus handling, the JRC/Ispra-ROBERTINO blanket handling experiment, and an EC-TELEMAN experiment.
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tele operator support for Fusion Plant maintenance the edith remote workstation
Fusion Engineering and Design, 1991Co-Authors: Klaus LeinemannAbstract:Abstract To support the tele-operator in Fusion Plant maintenance as flexibly and completely as possible at a high level a general purpose remote handling workstation concept has been developed and partly implemented. The remote handling workstation provides the man-machine interface and task level support functions. Task level support of the operator is based on the task knowledge represented as spatial models, procedure models, and functional models. These models and the related simulation systems are used for planning, execution, monitoring, training, and recovery. The workstation represents an intelligent, interactive, multi-media handbook guiding the operator through planned procedures and in abnormal situations. As a prototypic implementation of this workstation concept the EDITH remote workstation is being implemented for the EDITH (experimental device for in-torus handling) remote workstation.
Satoshi Konishi - One of the best experts on this subject based on the ideXlab platform.
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Limitation of Fusion power Plant installation on future power grids under the effect of renewable and nuclear power sources
Fusion Engineering and Design, 2016Co-Authors: Shutaro Takeda, Shigeki Sakurai, Ryuta Kasada, Yasushi Yamamoto, Satoshi KonishiAbstract:Abstract Future power grids would be unstable because of the larger share of renewable and nuclear power sources. This instability might bring some additional difficulties to Fusion Plant installation. Therefore, the authors carried out a quantitative feasibility study from the aspect of grid stability through simulation. Results showed that the more renewable and nuclear sources are linked to a grid, the greater disturbance the grid experiences upon a sudden output interruption of a Fusion power Plant, e.g. plasma disruption. The frequency deviations surpassed 0.2 Hz on some grids, suggesting potential limitations of Fusion Plant installation on future grids. To clearly show the suggested limitations of Fusion Plant installations, a novel diagram was presented.
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a system dynamics model for stock and flow of tritium in Fusion power Plant
Fusion Engineering and Design, 2015Co-Authors: Ryuta Kasada, Satoshi Konishi, Toshihiko Yamanishi, Saerom Kwon, Yoshiteru Sakamoto, Kenji TobitaAbstract:Abstract In order to analyze self-efficiency of tritium fuel cycle (TFC) and share the systems thinking of TFC among researchers and engineers in the vast area of Fusion reactor technology, we develop a system dynamics (SD) TFC model using a commercial software STELLA. The SD-TFC model is illustrated as a pipe diagram which consists of tritium stocks, such as plasma, fuel clean up, isotope separation, fueling with storage and blanket, and pipes connecting among them. By using this model, we survey a possibility of D-D start-up without initial loading of tritium on two kinds of Fusion Plant having different plasma parameters. The D-D start-up scenario can reduce the necessity of initial loading of tritium through the production in plasma by D-D reaction and in breeding blanket by D-D neutron. The model is also used for considering operation scenario to avoid excess stock of tritium which must be produced at tritium breeding ratio over unity.
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Dynamic Simulation-Based Case Study of Fusion on Small-Scale Electrical Grids
Fusion Science and Technology, 2015Co-Authors: Shutaro Takeda, Ryuta Kasada, Yasushi Yamamoto, Satoshi Konishi, Shigeki SakuraiAbstract:This study analyzed adverse effects of Fusion Plants on the stability of small-scale grids through simulation-based case studies. Major frequency fluctuations were observed in the event of a Plant start-up and a sudden interruption of Fusion electric output power, as represented by plasma disruption, suggesting difficulties in Fusion Plant installation to majority of countries in the future. To mitigate the adverse effects, a Fusion Plant combined with an energy storage was proposed and evaluated. The results indicated that large energy storage like pumped-hydro storage could successfully reduce the frequency deviations to the acceptable range. An innovative offshore pumped-hydro storage, marine inverse dam, is also discussed in this paper.
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Tritium Concentration in the Environment and Genomic DNA
Fusion Science and Technology, 2011Co-Authors: Toshihiro Shibata, Yasushi Yamamoto, Kazuyuki Noborio, Satoshi KonishiAbstract:AbstractIn this study, tritium transfer from foods Organic Bound Tritium or tritiated water to DNA was measured by E. coli cell and tritium concentration in DNA during Fusion Plant operation was estimated. Measured tritium concentration in DNA was much lower than estimated value based on the atomic ratio of culture medium. In addition, contribution of organic bound tritium in our food to calculated tritium concentration in DNA was greater than the contribution to tritium dose.
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Tritium Issues Toward Fusion Plants
Fusion Science and Technology, 2002Co-Authors: Satoshi Konishi, Satoshi Nishio, K Tobita, H. Okada, R. KuriharaAbstract:Technical issues on tritium technology are investigated from the aspects of processing, safety and fuel supply, considering the concept of DEMO Plant following ITER as the next target. Fusion Plant equipped with power blanket will contain high temperature heat transfer medium and bred tritium in a tritium cycle. Although the inventory and throughput may not increase drastically from ITER, tritium Plant will require significant technical improvements characterized by the self-consistent tritium fuel cycle and safety function to maintain the tritium level in the power train at adequately low level. Tritium balance issue will be one of the most important features because it will strongly affect the Fusion in energy market by supplying initial loading. Tritium processing for coolant that will be mainly used for normal operation will dominate the safety feature of the entire Plant by its technical difficulty and importance. Under off-normal conditions, this coolant tritium process can remove possible spill within the confinement, and thus Fusion Plant will not have any major process dedicated for accidents. Tritium technology is essential to make Fusion energy attractive from the aspect of socio-economics, and its success in development is of vital importance toward Fusion power Plant as viable energy source for future.
