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1.
V. Sandu S. Popa Elena Cimpoiasu 《Journal of Superconductivity and Novel Magnetism》1996,9(5):487-492
The paraconductivity of Li-doped YBa2Cu3O7?x was measured. We have found that the character of the fluctuation changes as lithium content increases: instead of a crossover from 2D to 3D behavior (D is the dimensionality), as we have observed for a low doping level, a double crossover to the 2D percolative and 3D percolative regimes becomes manifest by increasing the lithium content. 相似文献
2.
3.
Implicit–explicit (IMEX) time stepping methods can efficiently solve differential equations with both stiff and nonstiff components. IMEX Runge–Kutta methods and IMEX linear multistep methods have been studied in the literature. In this paper we study new implicit–explicit methods of general linear type. We develop an order conditions theory for high stage order partitioned general linear methods (GLMs) that share the same abscissae, and show that no additional coupling order conditions are needed. Consequently, GLMs offer an excellent framework for the construction of multi-method integration algorithms. Next, we propose a family of IMEX schemes based on diagonally-implicit multi-stage integration methods and construct practical schemes of order up to three. Numerical results confirm the theoretical findings. 相似文献
4.
Luneckas Mindaugas Luneckas Tomas Udris Dainius Plonis Darius Maskeliūnas Rytis Damaševičius Robertas 《Intelligent Service Robotics》2021,14(1):9-24
Intelligent Service Robotics - Walking robots are considered as a promising solution for locomotion across irregular or rough terrain. While wheeled or tracked robots require flat surface like... 相似文献
5.
Nicolas Gisin Sandu Popescu Valerio Scarani Stefan Wolf Jürg Wullschleger 《Natural computing》2013,12(1):13-17
We show that from a communication-complexity perspective, the primitive called oblivious transfer—which was introduced in a cryptographic context—can be seen as the classical analogue to a quantum channel in the same sense as non-local boxes are of maximally entangled qubits. More explicitly, one realization of non-cryptographic oblivious transfer allows for the perfect simulation of sending one qubit and measuring it in an orthogonal basis. On the other hand, a qubit channel allows for realizing non-cryptographic oblivious transfer with probability roughly 85 %, whereas 75 % is the classical limit. 相似文献
6.
Uncertainty quantification and apportionment in air quality models using the polynomial chaos method
Current air quality models generate deterministic forecasts by assuming perfect model, perfectly known parameters, and exact input data. However, our knowledge of the physics is imperfect. It is of interest to extend the deterministic simulation results with “error bars” that quantify the degree of uncertainty, and analyze the impact of the uncertainty input on the simulation results. This added information provides a confidence level for the forecast results. Monte Carlo (MC) method is a popular approach for air quality model uncertainty analysis, but it converges slowly. This work discusses the polynomial chaos (PC) method that is more suitable for uncertainty quantification (UQ) in large-scale models. We propose a new approach for uncertainty apportionment (UA), i.e., we develop a PC approach to attribute the uncertainties in model results to different uncertainty inputs. The UQ and UA techniques are implemented in the Sulfur Transport Eulerian Model (STEM-III). A typical scenario of air pollution in the northeast region of the USA is considered. The UQ and UA results allow us to assess the combined effects of different input uncertainties on the forecast uncertainty. They also enable to quantify the contribution of input uncertainties to the uncertainty in the predicted ozone and PAN concentrations. 相似文献
7.
Mohammed Mahmoud Yuqiong Liu Holly Hartmann Steven Stewart Thorsten Wagener Darius Semmens Robert Stewart Hoshin Gupta Damian Dominguez Francina Dominguez David Hulse Rebecca Letcher Brenda Rashleigh Court Smith Roger Street Jenifer Ticehurst Mark Twery Hedwig van Delden Ruth Waldick Denis White Larry Winter 《Environmental Modelling & Software》2009,24(7):798-808
Scenarios are possible future states of the world that represent alternative plausible conditions under different assumptions. Often, scenarios are developed in a context relevant to stakeholders involved in their applications since the evaluation of scenario outcomes and implications can enhance decision-making activities. This paper reviews the state-of-the-art of scenario development and proposes a formal approach to scenario development in environmental decision-making. The discussion of current issues in scenario studies includes advantages and obstacles in utilizing a formal scenario development framework, and the different forms of uncertainty inherent in scenario development, as well as how they should be treated. An appendix for common scenario terminology has been attached for clarity. Major recommendations for future research in this area include proper consideration of uncertainty in scenario studies in particular in relation to stakeholder relevant information, construction of scenarios that are more diverse in nature, and sharing of information and resources among the scenario development research community. 相似文献
8.
This paper constructs multirate linear multistep time discretizations based on Adams-Bashforth methods. These methods are
aimed at solving conservation laws and allow different timesteps to be used in different parts of the spatial domain. The
proposed family of discretizations is second order accurate in time and has conservation and linear and nonlinear stability
properties under local CFL conditions. Multirate timestepping avoids the necessity to take small global timesteps—restricted
by the largest value of the Courant number on the grid—and therefore results in more efficient computations. Numerical results
obtained for the advection and Burgers’ equations confirm the theoretical findings.
This work was supported by the National Science Foundation through award NSF CCF-0515170. 相似文献
9.
Multiharmonic ac-magnetic susceptibility χ1, χ2, χ3, of neutron irradiated Li-doped YBa2Cu3O7−
x
has revealed a nonmonotonic dependence of all harmonics on the neutron fluence. The irradiation has a strongly depressive
influence on the intergrain connection suggesting an increase of the effective thickness of the intergranular Josephson junction
at a neutron fluence of 0.98 × 1017 cm−2. Less damaged are the intragrain properties. A spectacular enhancement of the superconducting intragranular properties reflected
in the characteristics of all harmonics was observed at highest fluence Φ = 9.98 × 1017 cm−2. We assume that this effect results from the development of a space inhomogeneous distribution with alternating defectless
and defect-rich regions. 相似文献
10.