Hasil untuk "Periodicals"

Stefan Maintz, Volker L. Deringer, A. Tchougréeff et al.

The computer program LOBSTER (Local Orbital Basis Suite Towards Electronic‐Structure Reconstruction) enables chemical‐bonding analysis based on periodic plane‐wave (PAW) density‐functional theory (DFT) output and is applicable to a wide range of first‐principles simulations in solid‐state and materials chemistry. LOBSTER incorporates analytic projection routines described previously in this very journal [J. Comput. Chem. 2013, 34, 2557] and offers improved functionality. It calculates, among others, atom‐projected densities of states (pDOS), projected crystal orbital Hamilton population (pCOHP) curves, and the recently introduced bond‐weighted distribution function (BWDF). The software is offered free‐of‐charge for non‐commercial research. © 2016 The Authors. Journal of Computational Chemistry Published by Wiley Periodicals, Inc.

E. Glendening, C. Landis, F. Weinhold

N. Chilton, Russell P. Anderson, L. D. Turner et al.

H. G. D. Zúñiga, Nakwon Jung, S. Valenzuela

Kristin Lovejoy, Gregory D. Saxton

The rapid diffusion of “microblogging” services such as Twitter is ushering in a new era of possibilities for organizations to communicate with and engage their core stakeholders and the general public. To enhance understanding of the communicative functions microblogging serves for organizations, this study examines the Twitter utilization practices of the 100 largest nonprofit organizations in the United States. The analysis reveals there are three key functions of microblogging updates—“information,”“community,” and “action.” Though the informational use of microblogging is extensive, nonprofit organizations are better at using Twitter to strategically engage their stakeholders via dialogic and community-building practices than they have been with traditional websites. The adoption of social media appears to have engendered new paradigms of public engagement. © 2012 Wiley Periodicals, Inc. (Authors are listed in alphabetical order. The authors would like to thank Tom Feeley, Richard Waters, Seungahn Nah, I-hsuan Chiu, Yuchao Huang, and Kenton Anderson for helpful comments and suggestions.)

M. Cobo, A. G. López-Herrera, E. Herrera-Viedma et al.

F. Murtagh, Pedro Contreras

A. Maltese, R. Tai

James Avey, F. Luthans, S. Jensen

Michael Montemerlo, J. Becker, Suhrid Bhat et al.

L. Silvestre

Miriam J. Metzger

E. Sanville, S. Kenny, Roger Smith et al.

Y. Zhang, L. Lynd

Sevgin A. Eroglu, K. Machleit, Lenita M. Davis

S. Norris, L. Phillips

G. Kroemer, L. Galluzzi, P. Vandenabeele et al.

L. Saari, T. Judge

Joheen Chakraborty, Saul A. Rappaport, Riccardo Arcodia et al.

We report the first direct measurement of the period derivative in a quasi-periodic eruption (QPE), finding a smoothly increasing period with $\dot{P}\approx (1.7\pm 0.02)\times10^{-2}$ d d$^{-1}$ in the source ZTF19acnskyy/"Ansky". Most models for QPEs invoke repeated interactions of a stellar-mass orbiting companion around the supermassive black hole (SMBH) in an extreme mass-ratio inspiral (EMRI). In these scenarios, a positive $\dot{P}$ is surprising, but not impossible to produce. We explore several possible explanations for the observed $\dot{P}$, including stable mass-transfer driven by impulsive mass loss events in an EMRI, velocity kicks at pericenter due to tidal interactions with the SMBH, apparent period changes due either to general relativistic precession effects in an EMRI or light travel-time delays in a hierarchical SMBH binary, and mass-transfer variations in a thermal/viscous disk instability model. We find that none of the considered models provides a complete explanation for the data, motivating further work on physical explanations for positive period derivatives in QPEs.

Review of Vanessa Marie Fernández, Defining and Defying Borders: Tracing Hispanism across Literary Magazines