Academic literature on the topic 'Eyring Science Center'

The product angular momentum polarization of the Cl + C2D6 → DCl + C2D5 reaction is calculated via the quasiclassical trajectory (QCT) method at the collision energy of 0.25 eV. A new London–Eyring–Polanyi–Sato (LEPS) potential energy surface (PES) is used in this reaction. There is a "late" barrier and a "deep" well on this new LEPS PES. The four polarization-dependent "generalized" differential cross sections (PDDCSs) are presented in the center-of-mass frame. In the meantime, the distributions of P(ϕr), P(θr), and P(θr, ϕr) are calculated. The calculations are in good agreement with the experimental data. In addition, the rotational alignment factors [Formula: see text], [Formula: see text], and [Formula: see text] in the stationary-target frame (STF) are also calculated.

Using quasi-classical trajectory (QCT) method, the vector correlation between products and reagents for the exothermic reaction Ba + CH3I → BaI + CH3 has been studied on the extended Lond–Eyring–Polanyi–Sato (LEPS) potential energy surface (PES) at three collision energies of 1.6, 3.3, and 5.6 kcal/mol. The P(θr) distribution of the products describing the k-j' correlation and the dihedral angle distribution P(ϕr) describing k-k'-j' correlation are calculated in center-of-mass (CM) frame. Four polarization dependent generalized differential cross-sections (2π/σ)(dσ00/dωt), (2π/σ)(dσ20/dωt), (2π/σ)(dσ22+/dωt), and (2π/σ)(dσ21-/dωt) have also been presented in the CM frame as well. The results indicate that the product rotational angular momentum j' is not only aligned, but also oriented along the direction perpendicular to the scattering plane. In addition, the alignment and the orientation of the BaI product rotational angular momentum depend very sensitively on the collision energy.

Referências 1. Keeling, M. J. & Rohani, P. Modeling infectious diseases in humans and animals. Modeling Infectious Diseases in Humans and Animals (PRINCETON UNIVERSITYPRESS, 2011). 2. Aquilanti, V., Coutinho, N. D. & Carvalho-Silva, V. H. Kinetics of Low-Temperature Transitions and Reaction Rate Theory from Non-Equilibrium Distributions. Philos. Trans. R. Soc. London A 375, 20160204 (2017). 3. Carvalho-Silva, V. H., Coutinho, N. D. & Aquilanti, V. Temperature dependence of rate processes beyond Arrhenius and Eyring: Activation and Transitivity. Front. Chem. 7, 380 (2019). 4. Center For Systems Science And Engineering Johns Hopkins University. CSSEGISandData/COVID-19 (2020). Available at: https://github.com/CSSEGISandData/COVID-19. (Accessed: 30th March 2020) 5. Machado, H. G. et al. “Transitivity”: a code for computing kinetic and related parameters in chemical transformations and transport phenomena. Molecules 24, 3478 (2019). 6. Aquilanti, V., Borges, E. P., Coutinho, N. D., Mundim, K. C. & Carvalho-Silva, V. H. From statistical thermodynamics to molecular kinetics: the change, the chance and the choice. Rend. Lincei. Sci. Fis. e Nat. 28, 787–802 (2018). 7. Arnold, B. C. Pareto and Generalized Pareto Distributions. in Modeling Income Distributions and Lorenz Curves 119–145 (Springer New York, 2008). 8. Tsallis, C. Possible Generalization of Boltzmann-Gibbs Statistics. J. Stat. Phys. 52, 479–487 (1988). 9. Jena, A. K. & Chaturvedi, M. C. Phase transformation in materials. (Prentice Hall, 1992). 10. Poccia, N. et al. Evolution and control of oxygen order in a cuprate superconductor. Nat. Mater. 10, 733–736 (2011). 11. Zhao, S., Musa, S. S., Fu, H., He, D. & Qin, J. Simple framework for real-time forecast in a data-limited situation: The Zika virus (ZIKV) outbreaks in Brazil from 2015 to 2016 as an example. Parasites and Vectors 12, 344 (2019). 12. Subbaraman, N. Coronavirus tests: researchers chase new diagnostics to fight the pandemic. Nature (2020). doi:10.1038/d41586-020-00827-6 13. Balilla, J. Assessment of COVID-19 Mass Testing: The Case of South Korea. SSRN Electron. J. (2020). doi:10.2139/ssrn.3556346 14. Anderson, R. M., Heesterbeek, H., Klinkenberg, D. & Hollingsworth, T. D. How will country-based mitigation measures influence the course of the COVID-19 epidemic? The Lancet 395, 931–934 (2020).

A high spatial resolution acoustic directivity acquisition system (ADAS) has been developed to acquire anechoic measurements of the far field radiation of musical instruments that are either remote controlled or played by musicians. Building upon work performed by the BYU Acoustic Research Group in the characterization of loudspeaker directivity, one can rotate a musical instrument with sequential azimuthal angle increments under a fixed semicircular array of microphones while recording repeated notes or sequences of notes. This results in highly detailed and instructive directivity data presented in the form of high-resolution balloon plots. The directivity data and corresponding balloon plots may be shown to vary as functions of time or frequency. This thesis outlines the development of a prototype ADAS and its application to different sources including loudspeakers, a concert grand piano, trombone, flute, and violin. The development of a method of compensating for variations in the played amplitude at subsequent measurement positions using a near-field reference microphone and Frequency Response Functions (FRF) is presented along with the results of its experimental validation. This validation involves a loudspeaker, with known directivity, to simulate a live musician. It radiates both idealized signals and anechoic recordings of musical instruments with random variations in amplitude. The concept of coherence balloon maps and surface averaged coherence are introduced as tools to establish directivity confidence. The method of creating composite directivities for musical instruments is also introduced. A composite directivity comes from combining the directivities of all played partials to approximate what the equivalent directivity from a musical instrument would be if full spectral excitation could be used. The composite directivities are derived from an iterative averaging process that uses coherence as an inclusion criterion. Sample directivity results and discussions of experimental considerations of the piano, trombone, flute, and violin are presented. The research conducted is preliminary and will be further developed by future students to expand and refine the methods presented here.