Results 111 to 120 of about 1,145,232 (323)

Asymptotic bound on slow-roll parameter in stringy quintessence model

Nuclear Physics B
We study the late time behavior of the scalar part of the volume modulus and the dilaton in stringy quintessence model, focusing on their contributions to the Hubble slow-roll parameter ϵ which directly measures the deviation of the spacetime geometry ...
Min-Seok Seo
doaj   +1 more source

Influence of an Integral Heave Plate on the Dynamic Response of Floating Offshore Wind Turbine Under Operational and Storm Conditions

Energies, 2020
The hydrodynamic performance of the floating foundation for offshore wind turbines is essential to its stability and energy harvesting. A semi-submersible platform with an integral heave plate is proposed in order to reduce the vertical motion responses.
Yichen Jiang, Guanqing Hu, Zhi Zong, Li Zou, Guoqing Jin   +4 more
doaj   +1 more source

Inflationary perturbation theory is geometrical optics in phase space

, 2012
A pressing problem in comparing inflationary models with observation is the accurate calculation of correlation functions. One approach is to evolve them using ordinary differential equations ("transport equations"), analogous to the Schwinger-Dyson ...
, A. Achucarro, A. Avgoustidis, A.A. Starobinsky, C.T. Byrnes, C.T. Byrnes, C.W. Gardiner, D. Seery, D. Seery, D. Seery, D. Seery, D. Seery, D. Wands, D.H. Lyth, D.H. Lyth, D.H. Lyth, D.J. Mulryne, D.J. Mulryne, David J Mulryne, David Seery, F. de Felice, F. Vernizzi, G.I. Rigopoulos, I. Huston, I. Huston, J. Elliston, J. Fergusson, J. Martin, J.L. Cardy, Jonathan Frazer, L. Alabidi, P.R. Jarnhus, Planck collaboration, R. Penrose, R.H. Ribeiro, Raquel H Ribeiro, S. Dimopoulos, S. Groot Nibbelink, S. Yokoyama, S. Yokoyama, T. Battefeld, T. Battefeld, V. Desjacques, WMAP collaboration, Z. Lalak   +44 more
core   +1 more source

Engineered Protein‐Based Ionic Conductors for Sustainable Energy Storage Applications

Advanced Materials, EarlyView.
Rational incorporation of charged residues into an engineered, self‐assembling protein scaffold yields solid‐state protein films with outstanding ionic conductivity. Salt‐doping further enhances conductivity, an effect amplified in the engineered variants. These properties enable the material integration into an efficient supercapacitor.
Juan David Cortés‐Ossa, Paolo Blesio, Marcial Fernandez‐Castro, Lisa Almonte, Maxence Fernandez, Mantas Liutkus, Perumal Pandurangan, Carlos Sabater, Aitor Villaverde, Manuel Melle‐Franco, Nurit Ashkenasy, Felipe Jiménez‐Ángeles, M. Carmen Morant‐Miñana, M. Reyes Calvo, Aitziber L. Cortajarena   +14 more
wiley   +1 more source

Axion landscape and natural inflation

Physics Letters B, 2015
Multiple axions form a landscape in the presence of various shift symmetry breaking terms. Eternal inflation populates the axion landscape, continuously creating new universes by bubble nucleation.
Tetsutaro Higaki, Fuminobu Takahashi
doaj   +1 more source

Scale dependence of $f_{NL}$ in N-flation

, 2010
Adopting the horizon-crossing approximation, we derive the spectral index of $f_{NL}$ in general N-flation model. Axion N-flation model is taken as a typical model for generating a large $f_{NL}$ which characterizes the size of local form bispectrum.
A. Riotto, A.A. Starobinsky, C.T. Byrnes, C.T. Byrnes, C.T. Byrnes, C.T. Byrnes, C.T. Byrnes, D. Battefeld, D. Langlois, D.H. Lyth, D.H. Lyth, D.J. Mulryne, E. Komatsu ., E. Sefusatti, F. Vernizzi, J.M. Maldacena, Q.-G. Huang, Q.-G. Huang, Qing-Guo Huang, S. Dimopoulos, T. Banks, T. Battefeld, T. Suyama, T. Wang   +23 more
core   +1 more source

Self‐Assembled Inorganic Nanomembrane Tubes: Rolled‐Up Piezoelectrics for Microacoustic Wave‐Based Actuators and Sensors

Advanced Materials, EarlyView.
This study demonstrates a self‐assembly process to generate free‐standing piezoelectric nanomembranes, forming ultracompact microtubular acoustic wave sensors and actuators. The miniaturized 3D piezoelectric platform reported in this work can be applied in telecommunication, energy harvesting, and acoustofluidics. Moreover, the 3D self‐assembly can add
Raphaël C. L‐M. Doineau, Christian N. Saggau, Stefan Baunack, Thomas Gemming, Yara Abdelaal, Robert Weser, Oliver G. Schmidt, Hagen Schmidt, Andreas Winkler, Mariana Medina‐Sánchez   +9 more
wiley   +1 more source

Relaxing Constraints on Inflation Models with Curvaton

, 2005
We consider the effects of the curvaton, late-decaying scalar condensation, to observational constraints on inflation models. From current observations of cosmic density fluctuations, severe constraints on some class of inflation models are obtained, in ...
A. R. Liddle, G. ’t Hooft, K. Sato, Takeo Moroi, Tomo Takahashi, Yoshikazu Toyoda   +5 more
core   +1 more source

Role of the Recombination Zone in Organic Light‐Emitting Devices

Advanced Materials, EarlyView.
This review summarizes the critical role of the recombination zone in organic light‐emitting diodes (OLEDs). We highlight that broadening the recombination zone in OLEDs based on emissive layers with balanced charge transport and high photoluminescence quantum yields provides a promising route toward achieving both long operational lifetime and high ...
Yungui Li, Karl Leo
wiley   +1 more source

Single‐Chromophore Homojunction Organic Solar Cells: A Path to Simplicity and Efficiency

Advanced Materials, EarlyView.
This perspective discusses how the intrinsic optoelectronic properties of organic semiconductors, their molecular packing in the solid‐state, and internal energetic gradients within a device can enable free‐charge carrier generation in homojunction organic solar cells.
Shaun McAnally, Paul L. Burn, Paul E. Shaw   +2 more
wiley   +1 more source