Results 101 to 110 of about 264,275 (302)

Pseudo-random operators of the circular ensembles

open access: yes, 2004
We demonstrate quantum algorithms to implement pseudo-random operators that closely reproduce statistical properties of random matrices from the three universal classes: unitary, symmetric, and symplectic.
C. Stephen Hellberg   +9 more
core   +1 more source

Mixed‐Metal Promotion in a Manganese‐Molybdenum Oxynitride as Catalyst to Integrate C─C and C─N Coupling Reactions for the Direct Synthesis of Acetonitrile from Syngas and Ammonia

open access: yesAdvanced Materials, EarlyView.
Transition metal oxy/carbo‐nitrides show great promise as catalysts for sustainable processes. A Mn‐Mo mixed‐metal oxynitride attains remarkable performance for the direct synthesis of acetonitrile, an important commodity chemical, via sequential C─N and C─C coupling from syngas (C1) and ammonia (N1) feedstocks.
M. Elena Martínez‐Monje   +7 more
wiley   +1 more source

A Palm fossil closely related to Chamaerops humilis L. from the Lower Miocene of Sardinia [PDF]

open access: yes, 1990
This paper deals with the anatomical and histological study of a silicified specimen of a palm consisting of a part of the trunk surrounded by roots. The sample comes from the Lower Miocene of North West Sardinia.
Biondi, Edoardo   +1 more
core  

Beyond Presumptions: Toward Mechanistic Clarity in Metal‐Free Carbon Catalysts for Electrochemical H2O2 Production via Data Science

open access: yesAdvanced Materials, EarlyView.
Metal‐free carbon catalysts enable the sustainable synthesis of hydrogen peroxide via two‐electron oxygen reduction; however, active site complexity continues to hinder reliable interpretation. This review critiques correlation‐based approaches and highlights the importance of orthogonal experimental designs, standardized catalyst passports ...
Dayu Zhu   +3 more
wiley   +1 more source

Chirotteri carnivori in Europa? Il caso della Nottola gigante (<em>Nyctalus lasiopterus</em>)

open access: yesHystrix, the Italian Journal of Mammalogy, 2003
Nel maggio 1994, iniziò uno studio sulla chirotterofauna forestale nella Riserva Biogenetica di Pian di Novello (Toscana, Pistoia, 44°07?N-10°42?E). La vegetazione della riserva è dominata essenzialmente dal faggio ed è governata ad alto fusto con una ...
Simone Vergari, Gianna Dondini
doaj   +1 more source

Judgement of conceptual identity in monkeys [PDF]

open access: yes, 2001
Baboons (Papio anubis) were tested on categorization tasks at two different conceptual levels. The monkeys showed their ability (1) to judge as identical or different the objects belonging to two categories, on a perceptual basis, and (2) to perform a ...
Bovet, Pr D, Vauclair, Pr J
core  

Spin and Charge Control of Topological End States in Chiral Graphene Nanoribbons on a 2D Ferromagnet

open access: yesAdvanced Materials, EarlyView.
Chiral graphene nanoribbons on a ferromagnetic gadolinium‐gold surface alloy display tunable spin and charge states at their termini. Atomic work function variations and exchange fields enabe transitions between singlet, doublet, and triplet configurations.
Leonard Edens   +8 more
wiley   +1 more source

Draft genomes of “Pectobacterium peruviense” strains isolated from fresh water in France

open access: yesStandards in Genomic Sciences, 2018
Bacteria belonging to the genus Pectobacterium are responsible for soft rot disease on a wide range of cultivated crops. The “Pectobacterium peruviense” specie, recently proposed inside the Pectobacterium genus, gathers strains isolated from potato ...
Pierre Faye   +3 more
doaj   +1 more source

A combinatorial basis for the free Lie algebra of the labelled rooted trees

open access: yes, 2007
The pre-Lie operad can be realized as a space T of labelled rooted trees. A result of F. Chapoton shows that the pre-Lie operad is a free twisted Lie algebra. That is, the S-module T is obtained as the plethysm of the S-module Lie with an S-module F.
Bergeron, Nantel, Livernet, Muriel
core   +1 more source

Algebraic Bethe Ansatz for the two species ASEP with different hopping rates

open access: yes, 2007
An ASEP with two species of particles and different hopping rates is considered on a ring. Its integrability is proved and the Nested Algebraic Bethe Ansatz is used to derive the Bethe Equations for states with arbitrary numbers of particles of each type,
Alcaraz F C   +13 more
core   +1 more source

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