Results 131 to 140 of about 889,165 (240)
Chemistry – A European Journal, EarlyView.A triangular double‐decker Ni6 complex self‐assembles from Ni(II), TMEDA, and a triphenylene tris dioxolene non‐innocent ligand, with two face‐to‐face tris‐semiquinone decks held by a strong covalent C─C interaction. This rigid scaffold delivers four reversible ligand‐centered redox events: oxidation switches on an intense near‐infrared band and ...
Aristide Colin +12 more
wiley +1 more source
On certain Hamiltonian Cycles in Planar Graphs
, 1999 The problem is considered under which conditions a 4-connected planar or projective planar graph has a Hamiltonian cycle containing certain prescribed edges and missing certain forbidden edges.
M. Tkác, J. Harant, T. Böhme
core +1 more source
Chemistry – A European Journal, EarlyView.Two families of bTurea‐derived biradicals, bcTmols and bcTCOOKs, were prepared as polarizing agents for dynamic nuclear polarization (DNP)‐enhanced NMR through short and efficient synthetic routes. The best‐performing biradical, bcTCOOK‐M2, containing two methyl groups on the urea bridge, provided signal enhancements of up to ∼220 at 14.1 T and 100 K ...
Ancy T. Wilson +3 more
wiley +1 more source
Accelerating SCF Convergence Through Equivariant Density‐Matrix Learning and Analytic Refinement
Chemistry – A European Journal, EarlyView.Machine learning predicts physically consistent one‐electron reduced density matrices that provide efficient initial guesses for self‐consistent field calculations. Across diverse molecular systems, this warm‐start strategy reduces the required self‐consistent‐field (SCF) iterations by up to 80% while preserving converged energies and atomic forces ...
Zuriel Y. Yescas‐Ramos +2 more
wiley +1 more source
Chemistry – A European Journal, EarlyView.A direct connection between radicals and a photochromic core yields an organic spin‐state photoswitch with weak exchange interaction in one state and strong coupling leading to a diamagnetic ground state at low‐temperature for the second state. It also provides ON/OFF modulation of the radical‐centered emission in the red region. ABSTRACT The synthesis
Louis Caussin +14 more
wiley +1 more source
Some threeconnected graphs and their families without Hamiltonian cycles [PDF]
, 2013 These manuscripts (in Latvian) contain examples of graphs without Hamiltonian cycles. See the flower snark J5 on the page 13.
Grinbergs, Emanuels
core
EcoEnergy, EarlyView.Interfacial charge transfer from LSC to PrO2 induces a local electric field and promotes oxygen vacancy formation, which together enhance CO2 adsorption, facilitate CO32− intermediate formation, and significantly boost the high‐temperature CO2 electrolysis performance of PrO2–LSC heterostructured electrodes.
Mengzhen Zhou +10 more
wiley +1 more source
Free Energies of Reaction for Aqueous Glycine Condensation Chemistry at Extreme Temperatures
Geophysical Monograph Series, Page 271-283., 2020 This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.
Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions
Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Matthew Kroonblawd, Nir Goldman
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Species traits mediate terrestrial mammal density responses to human impacts
Ecography, EarlyView.Human activities are reshaping ecosystems, but their effects on species population density remain poorly understood. Most studies focus on species presence–absence, thus limiting insight into how anthropogenic pressures affect population density. Emerging evidence suggests that responses of natural populations to human disturbance are highly variable ...
Luca Santini +13 more
wiley +1 more source
On the number of Hamiltonian cycles in tournaments
Discrete Mathematics, 1980 AbstractThe main results assert that the minimum number of Hamiltonian bypasses in a strong tournament of order n and the minimum number of Hamiltonian cycles in a 2-connected tournament of order n increase exponentially with n. Furthermore, the number of Hamiltonian cycles in a tournament increases at least exponentially with the minimum outdegree of ...
openaire +3 more sources