Results 111 to 120 of about 828,136 (336)

Separation-dependent localization in a two-impurity spin-boson model

, 2010
Using a variational approach we investigate the delocalized to localized crossover in the ground state of an Ohmic two-impurity spin-boson model, describing two otherwise non-interacting spins coupled to a common bosonic environment.
Ahsan Nazir, Andrew J. Fisher, Dara P. S. McCutcheon, G. D. Mahan, H.-P. Breuer, J. J. Binney, M. A. Nielsen, M. H. Devoret, S. Sachdev, Sougato Bose, U. Weiss   +10 more
core   +1 more source

Unlocking Multi‐Valley Energy Pockets and Interface‐Induced Phonon Filtering in InSb Thermoelectrics by Reaction‐Driven Interface Engineering

Advanced Functional Materials, EarlyView.
InSb, a narrow‐bandgap semiconductor with high carrier mobility, is promising for thermoelectric energy conversion but suffers from high lattice thermal conductivity and strong bipolar conduction. Here, in situ interface engineering using Co2O3 nanoprecursors forms hierarchical CoSbx/In2O3/CoSb3 heterostructures that enhance phonon scattering and ...
Jiwu Xin, Xiao Yang, Xiao‐Lei Shi, Chengyun Xu, Xi Ling, Pengyu Zhang, Jinfeng Dong, Yong Du, Haisheng Chen, Ting Zhang, Zhi‐Gang Chen   +10 more
wiley   +1 more source

Resistance to learning and the evolution of cooperation [PDF]

, 2009
In many evolutionary algorithms, crossover is the main operator used in generating new individuals from old ones. However, the usual mechanism for generating offsprings in spatially structured evolutionary games has to date been clonation.
Jiménez Recaredo, Raúl José, Lugo, Haydeé, San Miguel, Maxi   +2 more
core   +2 more sources

Chirality and Organization of Adsorbates Modify Surface Phonon Dynamics

Advanced Functional Materials, EarlyView.
Chirality and molecular organization are shown to influence surface phonon dynamics in gold films. Time‐resolved Joule heating measurements reveal that ordered homochiral monolayers increase the Debye temperature and disordered layers reduce it, while ordered racemic controls have no effect.
Meital Ozeri, Eugenia Pyurbeeva, Shira Yochelis, Jonas Fransson, Ronnie Kosloff, Oded Millo, Yossi Paltiel   +6 more
wiley   +1 more source

High-spin low-spin transition

, 1999
Temperature dependent nuclear inelastic-scattering (NIS) of synchrotron radiation was applied to investigate both spin states of the spin-crossover complex [Fe(tpa)(NCS)(2)] (tpa = tris(2-pyridylmethyl)amine).
Grünsteudel, H., Paulsen, H., Toftlund, H., Trautwein, A. X., Winkler, H.   +4 more
core   +1 more source

Efficient Membranes Made of a Nanohybrid of Fluorine‐Doped Carbon Dots Coupled With Metal Organic Framework for High‐Performance Vanadium Redox Flow Battery

Advanced Functional Materials, EarlyView.
A sulfonated poly(ether ether ketone)‐based hybrid membrane is fabricated with fluorine‐doped carbon dot (FCD) and functionalized metal organic framework (MIL−101−NH2). The novel design reduces unwanted ion crossover while maintaining a sufficient proton transport pathway.
Tan Trung Kien Huynh, Nayanthara P. S., Muhammad Fawad Khan, Tong Yang, Zijian Cai, Saveen Senanayake, Yang Yang, Jiaye Ye, Hongxia Wang   +8 more
wiley   +1 more source

Design of Novel Metaheuristic Techniques for Clustering

IEEE Access, 2018
One of the major drawbacks of clustering techniques utilizing a predetermined number of clusters is that it does not guarantee convergence to the global optimum.
Dina A. Moussa, Noureldin S. Eissa, Hassan Abounaser, Amr Badr   +3 more
doaj   +1 more source

Residual‐Lithium‐to‐LiF Conversion Enables a LiF–Fluorinated Carbon Interphase for Reconstruction‐Resistant Ni‐Rich Cathodes

Advanced Functional Materials, EarlyView.
A fluorine‐rich acrylate monomer (PFHEA) was solvent‐free applied to NCM90 and thermally decomposed under Ar to convert residual lithium into LiF and form a pre‐built LiF/fluorinated amorphous carbon (LiF/FC) interphase. The LiF/FC layer suppresses NiO rock‐salt reconstruction and microcrack propagation, lowers interfacial resistance, and improves Li ...
Pangyu Kim, Juyeon Han, Junhyeok Kim, Younghoon Kim, Eunha Seo, Dain Kim, Jeeyoung Yoo   +6 more
wiley   +1 more source

A Miniaturized Metamaterial-Based Dual-Band 4×4 Butler Matrix With Enhanced Frequency Ratio for Sub-6 GHz 5G Applications

IEEE Access
This paper introduces an innovative $4 \times 4$ dual-band Butler matrix (BM) characterized by compactness and an enhanced frequency ratio (K). The design employs meandered lines and an interdigital capacitor (IDC) unit-cell-based composite right/left ...
Abdulkadir Bello Shallah, Farid Zubir, Mohamad Kamal A. Rahim, Noorlindawaty Md. Jizat, Abdul Basit, Maher Assaad, Huda A. Majid   +6 more
doaj   +1 more source

Exploring the BEC-BCS Crossover with an Ultracold Gas of $^6$Li Atoms

, 2004
We present an overview of our recent measurements on the crossover from a Bose-Einstein condensate of molecules to a Bardeen-Cooper-Schrieffer superfluid.
Altmeyer, A., Bartenstein, M., Chin, C., Denschlag, J. Hecker, Geursen, R., Grimm, R., Jochim, S., Riedl, S.   +7 more
core   +1 more source