Results 41 to 50 of about 1,842,770 (342)

Dynamical Analysis of Attractor Behavior in Constant Roll Inflation

, 2019
There has been considerable recent interest in a new class of non-slow roll inflationary solutions known as \textit{constant roll} inflation. Constant roll solutions are a generalization of the ultra-slow roll (USR) solution, where the first Hubble slow ...
Kinney, William H., Lin, Wei-Chen, Morse, Michael J. P.   +2 more
core   +1 more source

The first demonstration of entirely roll-to-roll fabricated perovskite solar cell modules under ambient room conditions

Nature Communications
The rapid development of organic-inorganic hybrid perovskite solar cells has resulted in laboratory-scale devices having power conversion efficiencies that are competitive with commercialised technologies.
Hasitha C. Weerasinghe, Nasiruddin Macadam, Jueng‐Eun Kim, Luke J. Sutherland, Dechan Angmo, Leonard W T Ng, Andrew D. Scully, Fiona Glenn, Regine Chantler, N. Chang, Mohammad Dehghanimadvar, Lei Shi, Anita W. Y. Ho‐Baillie, R. Egan, A. Chesman, Mei Gao, J. Jasieniak, T. Hasan, Doojin Vak   +18 more
semanticscholar   +1 more source

Minimising efficiency roll-off in high-brightness perovskite light-emitting diodes

Nature Communications, 2018
Efficiency roll-off is a major issue for most types of light-emitting diodes (LEDs), and its origins remain controversial. Here we present investigations of the efficiency roll-off in perovskite LEDs based on two-dimensional layered perovskites.
Wei Zou, Renzhi Li, Shuting Zhang, Yun Liu, Nana Wang, Yu Cao, Yanfeng Miao, Mengmeng Xu, Qiang Guo, D. Di, Li Zhang, Chang Yi, F. Gao, R. Friend, Jianpu Wang, Wei Huang   +15 more
semanticscholar   +1 more source

A figure of merit for efficiency roll-off in TADF-based organic LEDs

Nature
Organic light-emitting diodes (OLEDs) are a revolutionary light-emitting display technology that has been successfully commercialized in mobile phones and televisions1,2.
S. Diesing, L. Zhang, E. Zysman‐Colman, I. Samuel   +3 more
semanticscholar   +1 more source

Roll-to-Roll Gravure Printed Electrochemical Sensors for Wearable and Medical Devices.

ACS Nano, 2018
As recent developments in noninvasive biosensors spearhead the thrust toward personalized health and fitness monitoring, there is a need for high throughput, cost-effective fabrication of flexible sensing components.
Mallika Bariya, Ziba Shahpar, Hyejin Park, Junfeng Sun, Younsu Jung, Wei Gao, H. Nyein, T. S. Liaw, Li-Chia Tai, Quynh P. Ngo, Minghan Chao, Yingbo Zhao, M. Hettick, Gyoujin Cho, A. Javey   +14 more
semanticscholar   +1 more source

Primordial black holes and secondary gravitational waves from ultraslow roll and punctuated inflation

Physical Review D, 2020
[Abridged] The primordial scalar power spectrum is well constrained on large scales, primarily by the observations of the anisotropies in the cosmic microwave background (CMB). Over the last few years, it has been recognized that a sharp rise in power on
H. V. Ragavendra, Pankaj Saha, L. Sriramkumar, J. Silk   +3 more
semanticscholar   +1 more source

New perspectives on constant-roll inflation

, 2018
We study constant-roll inflation using the $\beta$-function formalism. We show that the constant rate of the inflaton roll is translated into a first order differential equation for the $\beta$-function which can be solved easily.
Cicciarella, F., Mabillard, J., Pieroni, M.   +2 more
core   +1 more source

Roll-to-roll, high-resolution 3D printing of shape-specific particles

Nature
Particle fabrication has attracted recent attention owing to its diverse applications in bioengineering1,2, drug and vaccine delivery3–5, microfluidics6,7, granular systems8,9, self-assembly5,10,11, microelectronics12,13 and abrasives14.
J. Kronenfeld, Lukas Rother, Max A. Saccone, M. Dulay, Joseph Desimone   +4 more
semanticscholar   +1 more source

Information-Based Trade in German Real Estate and Equity Markets

Risks, 2015
This paper employs four established market microstructure measures on information-based trade in financial markets. A set of German mid and small caps is used to analyze potential differential information content in real estate stocks compared to other ...
Marco Wölfle
doaj   +1 more source

Noncommutative spacetime effect on the slow-roll period of inflation [PDF]

, 2004
We study how the noncommutative spacetime affects on inflation. First we obtain the noncommutative power spectrum of the curvature perturbations produced during inflation in the slow-roll approximation.
Kim, Hungsoo, Lee, Gil Sang, Myung, Yun Soo   +2 more
core   +1 more source