ORCID Profile
0000-0002-4924-0668
Current Organisation
Gottfried Wilhelm Leibniz Universität Hannover
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Publisher: American Chemical Society (ACS)
Date: 14-09-2021
Publisher: Elsevier BV
Date: 07-2023
Publisher: IOP Publishing
Date: 15-01-2018
Publisher: Elsevier BV
Date: 11-2004
DOI: 10.1016/J.TPB.2004.06.006
Abstract: The extent to which natural selection shapes ersity within populations is a key question for population genetics. Thus, there is considerable interest in quantifying the strength of selection. A full likelihood approach for inference about selection at a single site within an otherwise neutral fully linked sequence of sites is described here. A coalescent model of evolution is used to model the ancestry of a s le of DNA sequences which have the selected site segregating. The mutation model, for the selected and neutral sites, is the infinitely many-sites model where there is no back or parallel mutation at sites. A unique perfect phylogeny, a gene tree, can be constructed from the configuration of mutations on the s le sequences under this model of mutation. The approach is general and can be used for any bi-allelic selection scheme. Selection is incorporated through modelling the frequency of the selected and neutral allelic classes stochastically back in time, then using a sub ided population model considering the population frequencies through time as variable population sizes. An importance s ling algorithm is then used to explore over coalescent tree space consistent with the data. The method is applied to a simulated data set and the gene tree presented in Verrelli et al. (2002).
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 12-2018
Publisher: MDPI AG
Date: 18-08-2016
DOI: 10.3390/POLYM8080308
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2021
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 06-2019
Publisher: American Chemical Society (ACS)
Date: 05-07-2023
Publisher: Wiley
Date: 09-2023
DOI: 10.1002/CEPA.2285
Publisher: Elsevier BV
Date: 12-2019
Publisher: American Institute of Aeronautics and Astronautics
Date: 04-01-2021
DOI: 10.2514/6.2021-0626
Publisher: Elsevier BV
Date: 11-2017
Publisher: Elsevier BV
Date: 10-2022
Publisher: American Chemical Society (ACS)
Date: 08-09-2022
DOI: 10.1021/ACS.NANOLETT.2C02729
Abstract: Organic-inorganic layered perovskites are currently some of the most promising 2D van der Waals materials. Low crystal quality usually broadens the exciton line width, obscuring the fine structure of the exciton in conventional photoluminescence experiments. Here, we propose a mechanical approach to reducing the effect of spectral diffusion by means of hBN capping on layered perovskites, revealing the exciton fine structure. We used a stochastic model to link the reduction of the spectral line width with the population of charge fluctuation centers present in the organic spacer. van der Waals forces between both lattices cause the partial cl ing of the perovskite organic spacer molecules, and hence the litude of the overall spectral diffusion effect is reduced. Our work provides a low-cost solution to the problem of accessing important fine-structure excitonic state information, along with an explanation of the important carrier dynamics present in the organic spacer that affect the quality of the optical emission.
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 12-2011
Publisher: SPIE
Date: 08-2021
DOI: 10.1117/12.2595442
Publisher: Elsevier BV
Date: 12-2012
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 12-2018
Publisher: MDPI AG
Date: 11-04-2014
DOI: 10.3390/POLYM6041096
Publisher: SAGE Publications
Date: 14-09-2012
Abstract: A three-dimensional elasticity solution for the analysis of functionally graded rotating cylinders with variable thickness profile is proposed. The axisymmetric structure has been ided in several isions in the radial direction. Constant mechanical properties and thickness profile are assumed within each ision. The solution is considered for four different thickness profiles, namely constant, linear, concave, and convex. It is shown that the linear, concave, and convex thickness profiles have smaller stress values compared to a constant thickness profile. The effects of various grading indices as well as different boundary conditions, namely solid, free–free hollow and fixed–free hollow structures are discussed. A series of numerical results using zirconia as outer surface ceramic and aluminium as inner surface metal are presented. Parametric study has then been carried out to give a better understanding of how different stress, strain, and displacement components change along radial and axial directions of the rotating structures. Numerical results show that for a given grading index, the structures with a concave thickness profile have the smaller circumferential strain and stress compared to other thickness profiles.
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2020
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 11-2012
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 04-2013
Publisher: SAGE Publications
Date: 08-11-2011
Abstract: A semi-analytical method is presented to calculate the dynamic responses of a rectangular plate due to a moving oscillator. In previous analytical solutions of the moving oscillator problem, the elastic distributed structure has usually been modeled by an elastic beam structure. This restrictive assumption is removed in this study by assuming a general plate as two-dimensional elastic distributed structure. The method can be applied for any arbitrary path on the plate. A combination of the Fourier and Laplace transformation as well as the convolution theorem is used to solve the governing differential equations of the problem. A modified integration technique is then presented to solve the coupled governing differential equations of motion. An adaptive finite element model of the system has been developed. In order to avoid the inaccurate results of the off-nodal position of the moving object, an adaptive mesh strategy is developed, thus the finite element mesh is ceaselessly adapted to follow the moving object trajectory. Illustrative ex les are then shown for three different paths. Comparisons between the simulation results of the presented semi-analytical method, for specific cases, with the results of the adaptive mesh finite element method and also with the available results in the literature demonstrate the validity of the methodology.
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 07-2023
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 2016
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 10-2010
Publisher: ASMEDC
Date: 2010
Abstract: Externally bonded FRP systems offer an attractive method to improve the fatigue life of steel beams. The fatigue performance of such a strengthened beam can be further enhanced by prestressing the bonded FRP reinforcement. While a number of studies have been conducted on the fatigue strengthening of steel beams using FRP, they have generally been concerned with the overall performance of the strengthened beam, with limited attention to the behaviour of the FRP-to-steel interface and its effects. Against this background, this paper presents the preliminary results of an ongoing experimental program aiming at investigating the behaviour and fatigue failure mechanism of FRP-strengthened cracked steel beams under fatigue cyclic loading, with particular emphasis on the debonding process of the FRP reinforcement and the effect of debonding on crack propagation. The effects of prestressing and debonding on the fatigue performance of the strengthened beam are clearly demonstrated by the test results.
Publisher: Elsevier BV
Date: 09-2023
Publisher: Elsevier BV
Date: 07-2013
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2021
Publisher: MDPI AG
Date: 04-03-2018
Publisher: Elsevier BV
Date: 10-2015
Publisher: Elsevier BV
Date: 11-2023
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 07-2010
Publisher: Elsevier BV
Date: 09-2016
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2015
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2023
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2021
Publisher: Elsevier BV
Date: 2013
Publisher: Wiley
Date: 19-05-2023
Abstract: Self‐assembled nanocrystals (NCs) into superlattices (SLs) are alternative materials to polycrystalline films and single crystals, which can behave very differently from their constituents, especially when they interact coherently with each other. This work concentrates on the Superradiance (SR) emission observed in SLs formed by CsPbBr 3 and CsPbBrI 2 NCs. Micro‐Photoluminescence spectra and transients in the temperature range 4–100 K are measured in SLs to extract information about the SR states and uncoupled domains of NCs. For CsPbBr 3 SLs with mostly homogeneous SR lines (linewidth 1–5 meV), this work measures lifetimes as short as 160 ps, 10 times lower than the value measured in a thin film made with the same NCs, which is due to domains of near identical NCs formed by 1000 to 40 000 NCs coupled by dipole–dipole interaction. The thermal decoherence of the SR exciton state is evident above 25 K due to its coupling with an effective phonon energy of ≈8 meV. These findings are an important step toward understanding the SR emission enhancement factor and the thermal dephasing process in perovskite SLs.
Publisher: Elsevier BV
Date: 04-2010
Location: No location found
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Elyas Ghafoori.