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  • 1
    Article
    Article
    2021
    ISSN: 0013-936X 
    Language: English
    In: Environmental science & technology, 2021-03-02, Vol.55 (5), p.2790-2799
    Description: Current studies on environmental chemistry mainly focus on a single stressor or single group of stressors, which does not reflect the multiple stressors in the dynamic exposome we are facing. Similarly, current studies on environmental toxicology mostly target humans, animals, or the environment separately, which are inadequate to solve the grand challenge of multiple receptors in One Health. Though chemical, biological, and physical stressors all pose health threats, the susceptibilities of different organisms are different. As such, significant relationships and interactions of the chemical, biological, and physical stressors in the environment and their holistic environmental and biological consequences remain unclear. Fortunately, the rapid developments in various techniques, as well as the concepts of multistressors in the exposome and multireceptor in One Health provide the possibilities to understand our environment better. Since the combined stressor is location-specific and mixture toxicity is species-specific, more comprehensive frameworks to guide risk assessment and environmental treatment are urgently needed. Here, three conceptual frameworks to categorize unknown stressors, spatially visualize the riskiest stressors, and investigate the combined effects of multiple stressors across multiple species within the concepts of the exposome and One Health are proposed for the first time.
    ISSN: 0013-936X
    E-ISSN: 1520-5851
    Source: Hellenic Academic Libraries Link
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  • 2
    Language: English
    In: Journal of statistical physics, 2018-06, Vol.171 (5), p.897-926
    Description: This work concerns the problem associated with averaging principle for a higher order nonlinear Schrödinger equation perturbed by a oscillating term arising as the solution of a stochastic reaction–diffusion equation evolving with respect to the fast time. This model can be translated into a multiscale stochastic partial differential equations. Stochastic averaging principle is a powerful tool for studying qualitative analysis of stochastic dynamical systems with different time-scales. To be more precise, under suitable conditions, we prove that there is a limit process in which the fast varying process is averaged out and the limit process which takes the form of the higher order nonlinear Schrödinger equation is an average with respect to the stationary measure of the fast varying process. Finally, by using the Khasminskii technique we can obtain the rate of strong convergence for the slow component towards the solution of the averaged equation, and as a consequence, the system can be reduced to a single higher order nonlinear Schrödinger equation with a modified coefficient.
    Subject(s): Strong convergence ; Higher order nonlinear Schrödinger equation ; Theoretical, Mathematical and Computational Physics ; Quantum Physics ; 35Q53 ; Averaging principle ; 70K65 ; Physics ; Fast–slow stochastic partial differential equation ; Statistical Physics and Dynamical Systems ; Physical Chemistry ; 70K70 ; 60H15 ; Diffusion rate ; Qualitative analysis ; Schroedinger equation ; Partial differential equations ; RANDOMNESS ; MATHEMATICAL SOLUTIONS ; DIFFUSION EQUATIONS ; STOCHASTIC PROCESSES ; NONLINEAR PROBLEMS ; SCHROEDINGER EQUATION ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; CONVERGENCE ; DYNAMICAL SYSTEMS ; OSCILLATIONS
    ISSN: 0022-4715
    E-ISSN: 1572-9613
    Source: Academic Search Ultimate
    Source: Alma/SFX Local Collection
    Source: © ProQuest LLC All rights reserved〈img src="https://exlibris-pub.s3.amazonaws.com/PQ_Logo.jpg" style="vertical-align:middle;margin-left:7px"〉
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  • 3
    Article
    Article
    2019
    ISSN: 0938-8974 
    Language: English
    In: Journal of nonlinear science, 2019-08-15, Vol.29 (4), p.1701-1759
    Description: This paper investigates multiscale stochastic Klein–Gordon-heat system. We establish the well-posedness and two kinds of stochastic averaging principle for stochastic Klein–Gordon-heat system with two timescales. To be more precise, under suitable conditions, two kinds of averaging principle (the autonomous case and the nonautonomous case) are proved, and as a consequence, the multiscale stochastic Klein–Gordon-heat system can be reduced to a single stochastic Klein–Gordon equation (averaged equation) with a modified coefficient, the slow component of multiscale stochastic system toward the solution of the averaged equation in moment (the autonomous case) and in probability (the nonautonomous case).
    Subject(s): 37L55 ; Stochastic Klein–Gordon equation ; Effective dynamics ; Stochastic Klein–Gordon-heat system ; Theoretical, Mathematical and Computational Physics ; Classical Mechanics ; Economic Theory/Quantitative Economics/Mathematical Methods ; Mathematics ; 37H10 ; 70K65 ; Stochastic averaging principle ; Multiscale stochastic partial differential equations ; Analysis ; 70K70 ; Mathematical and Computational Engineering ; 60H15 ; Differential equations ; Stochastic systems ; Well posed problems ; Klein-Gordon equation ; Multiscale analysis
    ISSN: 0938-8974
    E-ISSN: 1432-1467
    Source: Academic Search Ultimate
    Source: Alma/SFX Local Collection
    Source: © ProQuest LLC All rights reserved〈img src="https://exlibris-pub.s3.amazonaws.com/PQ_Logo.jpg" style="vertical-align:middle;margin-left:7px"〉
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  • 4
    Article
    Article
    2020
    ISSN: 1424-0637 
    Language: English
    In: Annales Henri Poincaré, 2020-05, Vol.21 (5), p.1637-1675
    Description: This paper is devoted to an averaging principle for multiscale stochastic fractional Schrödinger equation. This averaging principle can validate the effectiveness of the averaging method in fractional quantum mechanics; it ascertains the utility of the approximation obtained by averaging method. Unlike the stochastic heat equation, the smoothing effect of fractional Schrödinger semigroup is not enough to establish averaging principle; in order to overcome this difficulty, we use the vanishing viscosity method.
    Subject(s): Thermodynamics ; Quantum mechanics ; Schroedinger equation
    ISSN: 1424-0637
    E-ISSN: 1424-0661
    Source: Alma/SFX Local Collection
    Source: © ProQuest LLC All rights reserved〈img src="https://exlibris-pub.s3.amazonaws.com/PQ_Logo.jpg" style="vertical-align:middle;margin-left:7px"〉
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  • 5
    Language: English
    In: Zeitschrift für angewandte Mathematik und Physik, 2019-08, Vol.70 (4), p.1-28
    Description: This work concerns averaging principle for Korteweg–de Vries equation perturbed by a oscillating term which arises from the solution of a stochastic reaction–diffusion equation. This model can be translated into multiscale stochastic partial differential equations. Under some suitable conditions, we show that the slow component strongly converges to the solution of a single Korteweg–de Vries equation with a modified coefficient (averaged equation). To be more precise, by using the Khasminskii technique, we can obtain the strong convergence rate of the slow component towards the solution of the corresponding averaged equation, and as a consequence, the multiscale system can be reduced to the averaged equation.
    Subject(s): Engineering ; Mathematical Methods in Physics ; Strong convergence ; Fast–slow SPDEs ; 70K70 ; Korteweg–de Vries equation ; 35Q53 ; Averaging principle ; Theoretical and Applied Mechanics ; 70K65 ; 60H15 ; Analysis ; Differential equations ; Partial differential equations ; Reaction-diffusion equations ; Convergence
    ISSN: 0044-2275
    E-ISSN: 1420-9039
    Source: Alma/SFX Local Collection
    Source: © ProQuest LLC All rights reserved〈img src="https://exlibris-pub.s3.amazonaws.com/PQ_Logo.jpg" style="vertical-align:middle;margin-left:7px"〉
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  • 6
    Article
    Article
    2019
    ISSN: 1029-242X 
    Language: English
    In: Journal of inequalities and applications, 2019-12, Vol.2019 (1), p.1-9
    Description: Motivated by existing results, we present some completely monotonic functions involving the polygamma functions.
    Subject(s): 33B15 ; Completely monotonic function ; Analysis ; Polygamma functions ; Mathematics, general ; Mathematics ; Applications of Mathematics
    ISSN: 1029-242X
    E-ISSN: 1029-242X
    Source: Academic Search Ultimate
    Source: Directory of Open Access Journals
    Source: Alma/SFX Local Collection
    Source: ProQuest Central
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  • 7
    Language: English
    In: Mathematical methods in the applied sciences, 2019-03-15, Vol.42 (4), p.1122-1150
    Description: Stochastic averaging principle is a powerful tool for studying qualitative analysis of multiscale stochastic dynamical systems. In this paper, we will establish an averaging principle for stochastic reaction‐diffusion‐advection equations with slow and fast time scales. Under suitable conditions, we show that the slow component strongly converges to the solution of the corresponding averaged equation.
    Subject(s): fast‐slow SPDEs ; strong convergence ; stochastic averaging principle ; stochastic reaction‐diffusion‐advection equation
    ISSN: 0170-4214
    E-ISSN: 1099-1476
    Source: Alma/SFX Local Collection
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  • 8
    Language: English
    In: Mathematical methods in the applied sciences, 2018-05-15, Vol.41 (7), p.2769-2794
    Description: In this paper, we will establish the bounded solutions, periodic solutions, quasiperiodic solutions, almost periodic solutions, and almost automorphic solutions for linearly coupled complex cubic‐quintic Ginzburg‐Landau equations, under suitable conditions. The main difficulty is the nonlinear terms in the equations that are not Lipschitz‐continuity, traditional methods cannot deal with the difficulty in our problem. We overcome this difficulty by the Galerkin approach, energy estimate method, and refined inequality technique.
    Subject(s): bounded solutions ; linearly coupled complex cubic‐quintic Ginzburg‐Landau equations ; periodic solutions ; almost automorphic solutions ; quasi‐periodic solutions ; almost periodic solutions
    ISSN: 0170-4214
    E-ISSN: 1099-1476
    Source: Alma/SFX Local Collection
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  • 9
    Language: English
    In: Advanced science, 2018-02, Vol.5 (2), p.1700331-n/a
    Description: Many years since the booming of research on perovskite solar cells (PSCs), the hybrid perovskite materials developed for photovoltaic application form three main categories since 2009: (i) high‐performance unstable lead‐containing perovskites, (ii) low‐performance lead‐free perovskites, and (iii) moderate performance and stable lead‐containing perovskites. The search for alternative materials to replace lead leads to the second group of perovskite materials. To date, a number of these compounds have been synthesized and applied in photovoltaic devices. Here, lead‐free hybrid light absorbers used in PV devices are focused and their recent developments in related solar cell applications are reviewed comprehensively. In the first part, group 14 metals (Sn and Ge)‐based perovskites are introduced with more emphasis on the optimization of Sn‐based PSCs. Then concerns on halide hybrids of group 15 metals (Bi and Sb) are raised, which are mainly perovskite derivatives. At the same time, transition metal Cu‐based perovskites are also referred. In the end, an outlook is given on the design strategy of lead‐free halide hybrid absorbers for photovoltaic applications. It is believed that this timely review can represent our unique view of the field and shed some light on the direction of development of such promising materials. Real clean energy means the whole process of its generation has low environmental and health impact. Recent progress of five types of hybrid halide absorbers against the thorny problem of lead toxicity is introduced based on the state‐of‐the‐art perovskite solar cells (PSCs). Can we make high‐efficiency PSCs without being poisoned?
    Subject(s): low dimensional materials ; lead‐free absorbers ; tin halide perovskite ; perovskite solar cell ; bismuth halide perovskite ; Copyright ; Solvents ; Researchers ; Alternative energy sources ; Photovoltaic cells ; Efficiency ; Metals ; Light
    ISSN: 2198-3844
    E-ISSN: 2198-3844
    Source: PubMed Central
    Source: © ProQuest LLC All rights reserved〈img src="https://exlibris-pub.s3.amazonaws.com/PQ_Logo.jpg" style="vertical-align:middle;margin-left:7px"〉
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  • 10
    Language: English
    In: Advanced energy materials, 2018-03-26, Vol.8 (9), p.1702512-n/a
    Description: Perovskite solar cells have delivered power conversion efficiency beyond 22% in less than seven years, implying the potential for the paradigm shift of low‐cost photovoltaics with high efficiency and low embedded energy. Besides the “perovskite fever,” the development of new hole transport materials (HTM), especially dopant‐free HTMs, is another research hotspot. This is because the currently used HTMs, such as spiro‐OMeTAD derivatives, require additional chemical doping process to ensure sufficient conductivity and proper ionic potential level for efficient hole transport and collection. However, the commonly used dopants are volatile and hygroscopic which not only increase the complexity and cost of device fabrication but also deteriorate the device stability. So far, there have been several reviews on new HTMs, but review or analysis on dopant‐free HTMs is scarce. In this review, all reported dopant‐free HTMs are categorized into four primary different types and lessons will be learned during the separate discussions. The stability test behavior of all the intrinsic HTMs will be evaluated directly. In the end, the correlations between the properties of the intrinsic HTMs and parameters of the devices will be plotted to shed light on the future direction of development of this field. Chemical dopants inside organic semiconductor are however not chemically bonded to the matrix. Their hydrophilic and mobile nature plays a significant role in the degradation of the perovskite devices. Dopant free HTMs are of great importance for the final application of this new PV technology.
    Subject(s): long‐term stability ; high mobility ; hole transporting materials ; perovskite ; dopant‐free ; Solar cells ; Solar batteries ; Perovskite
    ISSN: 1614-6832
    E-ISSN: 1614-6840
    Source: Alma/SFX Local Collection
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