Results 111 to 120 of about 1,323,147 (330)

Coupled Quintessence in a Power-Law Case and the Cosmic Coincidence Problem

, 2005
The problem of the cosmic coincidence is a longstanding puzzle. This conundrum may be solved by introducing a coupling between the two dark sectors. In this Letter, we study a coupled quintessence scenario in which the scalar field evolves in a power law
Steinhardt P., XIN ZHANG
core   +3 more sources

Flow‐Induced Vascular Remodeling on‐Chip: Implications for Anti‐VEGF Therapy

Advanced Functional Materials, EarlyView.
Flow‐induced vascular remodeling plays a critical role in network stabilization and function. Using a vasculature‐on‐chip system, this study reveals how physiological VEGF levels and flow affect vascular remodeling and provides insights into tumor vessel normalization.
Fatemeh Mirzapour‐Shafiyi, Elias Huber, Leonie Karr, Johnny Tong, Andreas Richard Bausch, Friedrich Christian Simmel, Karen Alim   +6 more
wiley   +1 more source

Copper‐based Materials for Photo and Electrocatalytic Process: Advancing Renewable Energy and Environmental Applications

Advanced Functional Materials, EarlyView.
Cu‐based catalysts as a cornerstone in advancing sustainable energy technologies are fully reviewed in this manuscript, highlighting their potential in photo‐ and electrocatalysis. It includes metallic copper, copper oxides, copper sulfides, copper halide perovskites, copper‐based metal–organic frameworks (MOFs), and covalent organic frameworks (COFs),
Jéssica C. de Almeida, Yanjie Wang, Thais A. Rodrigues, Paulo H. H. Nunes, Vagner R. de Mendonça, Paulo H. E. Falsetti, Leticia V. Savazi, Tao He, Alexandra V. Bardakova, Aida V. Rudakova, Jie Tian, Alexei V. Emeline, Osmando F. Lopes, Antonio Otavio T. Patrocínio, Jia Hong Pan, Caue Ribeiro, Detlef W. Bahnemann   +16 more
wiley   +1 more source

Is a hyperchaotic attractor superposition of two multifractals?

, 2017
In the context of chaotic dynamical systems with exponential divergence of nearby trajectories in phase space, hyperchaos is defined as a state where there is divergence or stretching in at least two directions during the evolution of the system.
Ambika, G., Harikrishnan, K. P., Misra, R.   +2 more
core   +1 more source

Understanding and Addressing the Performance Asymmetry Issue in Semitransparent Laminated Organic Photovoltaic Devices

Advanced Functional Materials, EarlyView.
This work addresses the challenge of current–voltage asymmetry in scalable laminated semitransparent organic photovoltaics (OPVs) for indoor applications. Vertical stratification of materials is shown to create an energy barrier, leading to performance differences under different illumination directions.
Gulzada Beket, Anton Zubayer, Leonie Pap, Huagui Lai, Samiran Bairagi, Nakul Jain, Jochen Stahn, Fan Fu, Kenneth Järrendahl, Fredrik Eriksson, Xabier Rodríguez‐Martínez, Olle Inganäs, Uli Würfel, Thomas Österberg, Jonas Bergqvist, Feng Gao   +15 more
wiley   +1 more source

Dynamical estimates of chaotic systems from Poincar\'e recurrences

, 2009
We show that the probability distribution function that best fits the distribution of return times between two consecutive visits of a chaotic trajectory to finite size regions in phase space deviates from the exponential statistics by a small power-law ...
Alligood K. T., Collet P., Dariel M. Maranhão, J. C. Sartorelli, Kantz H., Lacosta A., M. S. Baptista, Nicolis G.   +7 more
core   +1 more source

Pullback attractor of a nonautonomous fourth-order parabolic equation modeling epitaxial thin film growth

Electronic Journal of Differential Equations, 2015
We study a nonautonomous fourth-order parabolic equation modeling epitaxial thin film growth. It is shown that a pullback attractor of the model exists when the external force has exponential growth.
Ning Duan, Xiaopeng Zhao
doaj  

Exponential attractors for abstract equations with memory and applications to viscoelasticity

Discrete & Continuous Dynamical Systems - A, 2015
We consider an abstract equation with memory of the form $$\partial_t \boldsymbol{x}(t)+\int_{0}^\infty k(s) \boldsymbol{A}\boldsymbol{x}(t-s){\rm d} s+\boldsymbol{B}\boldsymbol{x}(t)=0$$ where $\boldsymbol{A},\boldsymbol{B}$ are operators acting on some Banach space, and the convolution kernel $k$ is a nonnegative convex summable function of unit mass.
DANESE, VALERIA, Geredeli, P. G., PATA, VITTORINO   +2 more
openaire   +4 more sources

Deterministic Writing of Field‐Free and Unipolar Spin‐Transfer Torque Magnetic Random‐Access Memory

Advanced Functional Materials, EarlyView.
Deterministic unipolar‐switching STT‐MRAM with field‐free operation is experimentally demonstrated. The device features a compact 4F2 cell architecture using a diode as the access device and a single magnetic tunneling junction. Unlike conventional bipolar switching STT‐MRAM requiring a three‐terminal access transistor in the array, this design offers ...
Ming‐Chun Hong, Ching Shih, Guan‐Long Chen, Yu‐Chen Hsin, Chen‐Yu Yang, Hsin‐Han Lee, Kuan‐Ming Chen, Yu‐Ho Kao, Tsai‐Yu Wu, Chiao‐Yun Lo, Sin‐You Huang, Cheng‐Yi Shih, Shan‐Yi Yang, I‐Jung Wang, Yao‐Jen Chang, Shih‐Ching Chiu, Yi‐Hui Su, Chih‐Yao Wang, Jeng‐Hua Wei, Shyh‐Shyuan Sheu, Wei‐Chung Lo, Shih‐Chieh Chang, Tuo‐Hung Hou   +22 more
wiley   +1 more source

Phase Space Analysis of Quintessence Cosmologies with a Double Exponential Potential

, 2004
We use phase space methods to investigate closed, flat, and open Friedmann-Robertson-Walker cosmologies with a scalar potential given by the sum of two exponential terms.
Barreiro T, Bergshoeff E, Bergshoeff E, Bergshoeff E, Billyard A P, Billyard A P, Billyard A P, Brustein R, Brustein R de Alwis S P, Burgess C P, Carroll S M, Chen C M, Chen C M, Coley A A, Coley A A, Copeland E J, Copeland E J, Dehnen H, Emparan R, Frank Saueressig, Gibbons G W, Giddings S B, Gutperle M, Heard I P C, Järv L, Järv L, Järv L Mohaupt T Saueressig F, Kachru S, Kachru S, Knop R A, Kovman L, Laur Järv, Li X Z, Li X Z, Louis J, Mohaupt T, Neupane I P, Otha N, Russo J G, Steinhardt P J, Thomas Mohaupt, Townsend P K, van den Hoogen R J, van den Hoogen R J, Vieira P G, Wohlfarth M N R   +45 more
core   +1 more source