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Mapping Between Charge-Dyon and Position-Dependent Mass Systems

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Communications in Theoretical Physics 2019年第10期71卷 1261-1266页

作者： Anderson L.de Jesus Alexandre G.M.schmidt Departamento de Fisica de Volta Redonda Instituto de Ciencias Exatas—Universidade Federal Fluminense

The primary purpose of this work is to reproduce the scenario composed of a charge-dyon system utilizing position-dependent effective mass(PDM) background in the non-relativistic and in the relativistic regimes. In the nonrelativistic case we substitute the exact charge-dyon eigenfunction into PDM Schr?dinger equation, in the Zhu-Kroemer parametrization, and then solve it for the mass distribution considering M = M(r). Analogously, in the relativistic case we study the Klein-gordon equation for a position-dependent mass, and in this case, we are able to analytically solve the equation for M = M(r, θ).

关键词： position-dependent mass Schrodinger equation Klein-gordon equation dyon

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Components Qualification for the Safe Operation of Nuclear Power Plants

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Journal of Energy and Power Engineering 2016年第10期10卷 581-590页

作者： Holger schmidt Martin Beetz Ingo Ganzmann Achim Beisiegel Thomas Wagner Christian Bonneau Darryl gordon Sun Jing AREVA GmbH-Thermal Hydraulics and Components Testing Paul-Gossenstr 100 Erlangen 91052 Germany ARE VA GmbH-Thermal Hydraulics and Components Testing Seligenstadter Strasse 100 Karlstein 63791 Germany AREVA SAS-Thermal Hydraulics and Components Testing 30 boulevard de l'Industrie Le Creusot 71205 France ARE VA Inc.-Thermal Hydraulics and Components Testing 3315 Old Forest Road Lynchburg VA 24501 USA Keysur International F11 Tower A Millennium Plaza No. 72 Beijing 100037 China

AREVA operates a world-wide unique thermal hydraulic platform to ensure high safety standards in the nuclear industries. This platform is operated as an accredited test and inspection body according to ISO 17025 and 17020 to grant a high and independently confmned quality standard. The accreditation also ensures the independency of the organization and confidentiality to the individual stakeholders, for example research centers, utilities, components suppliers, engineering companies and vendors. Especially for nuclear power plants, it is very relevant to consider that reliability depends on the integrity of its components during its life time-from design through construction, operation and maintenance. For example, a typical NPP （nuclear power plant） has 1,000 to 2,000 large valves and 7,500 to 12,500 small valves, of which about 200 to 400 are designated Safety Class 1. The qualification of these Safety Class 1 components is relevant for reactor new builds but also for installed plants. This paper explains newly established qualification tasks, the corresponding testing infrastructure, and the state of the art of testing technology. By way of example, the paper describes the program and possible sequence of qualifying NPP safety-related components.

关键词： Components testing nuclear qualification thermal hydraulics testing nuclear safety

Solitons and production of defects in flow-aligning nematic liquid crystals under simple shear flow

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Progress in Natural Science:Materials International 2002年第3期 30-39页

作者： Claudia schmidt,Christine PETER Institut fur Makromolekulare Chemie Albert-Ludwigs-Universitat Freiburg Stefan-Meier-Str. 31 D-79104 Freiburg Germany Institut fur Makromolekulare Chemie Albert-Ludwigs-Universitat Freiburg Stefan-Meier-Str. 31 D-79104 Freiburg Germany

The production of defects in flow-aligning nematic liquid crystals under simple shear flow is analyzed by linear stability analysis based on Leslie-Ericksen theory. It is pointed out that the equation of motion of the nematic director under simple shear flow conforms to the driven over-damped sine-gordon equation and has a soliton solution of amplitude π. It has also been shown that the stationary state with the director uniformly oriented at a Leslie angle is only a metastable state and that the potential, which governs the motion of the director, has infinite numbers of stable stationary states. Therefore, the defects, appearing as a stable solitary solution, can be nucleated from a uniformly aligned flow-aligning type of nematic liquid crystal by shear flow. On the other hand, the bands with long axis parallel to the vorticity axis, appearing as an unstable solution, can be observed as transient patterns at low shear rate and low shear strain value. The theoretical predictions are compared with prev

关键词： nematic liquid crystals defects solltons.

Integrating climate, biodiversity, and sustainable land-use strategies:innovations from China

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National Science Review 2021年第7期8卷 13-17页

作者： Guido schmidt-Traub Harvey Locke Jixi Gao Zhiyun Ouyang Justin Adams Lin Li Enric Sala M.Rebecca Shaw Sebastian Troёng Jing Xu Chunquan Zhu Changxin Zou Tianxiao Ma Fuwen Wei Sustainable Development Solutions Network Beyond the Aichi Targets Task Force IUCN World Commission on Protected Areas Yellowstone to Yukon Conservation Initiative Center for Satellite Applications on Ecology and Environment Ministry of Ecology and Environment Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Tropical Forest Alliance World Economic Forum Worldwide Fund for Nature National Geographic Society Conservation International Chinese Research Academy of Environmental Sciences Nature Initiatives and Tropical Forest Alliance World Economic Forum Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment Institute of Zoology Chinese Academy of Sciences

To reverse the accelerating degradation of biodiversity and ecosystem services(‘nature’) and climate [1,2], the Convention on Biological Diversity (CBD)and the UN Framework Convention on Climate Change (UNFCCC) will hold major meetings in 2021. We argue that, as a critical priority, countries need to design and implement integrated national strategies to achieve the goals of the three Rio Conventions (including the UN Convention to Combat Desertification—UNCCD) using spatially explicit analyses and policies. This integration can maximize co-benefits and help manage trade-offs to meet the Sustainable Development Goals(SDGs). Nature-based solutions (NBS)provide an important framework for such integration.

关键词： ECOSYSTEM SERVICES