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31.
Adams J Aggarwal MM Ahammed Z Amonett J Anderson BD Arkhipkin D Averichev GS Badyal SK Bai Y Balewski J Barannikova O Barnby LS Baudot J Bekele S Belaga VV Bellingeri-Laurikainen A Bellwied R Berger J Bezverkhny BI Bharadwaj S Bhasin A Bhati AK Bhatia VS Bichsel H Bielcik J Bielcikova J Billmeier A Bland LC Blyth CO Blyth SL Bonner BE Botje M Boucham A Bouchet J Brandin AV Bravar A Bystersky M Cadman RV Cai XZ Caines H Calderón de la Barca Sánchez M Castillo J Catu O Cebra D Chajecki Z 《Physical review letters》2005,95(12):122301
We report on the first measurement of elliptic flow v2(pT) of multistrange baryons Xi- +Xi+ and Omega- + Omega+ in heavy-ion collisions. In minimum-bias Au+Au collisions at square root of s(NN)=200 GeV, a significant amount of elliptic flow, comparable to other nonstrange baryons, is observed for multistrange baryons which are expected to be particularly sensitive to the dynamics of the partonic stage of heavy-ion collisions. The pT dependence of v2 of the multistrange baryons confirms the number of constituent quark scaling previously observed for lighter hadrons. These results support the idea that a substantial fraction of the observed collective motion is developed at the early partonic stage in ultrarelativistic nuclear collisions at the Relativistic Heavy Ion Collider. 相似文献
32.
P. H.?ChavanisEmail author J.?Vatteville F.?Bouchet 《The European Physical Journal B - Condensed Matter and Complex Systems》2005,46(1):61-99
We discuss the dynamics and thermodynamics of the
Hamiltonian Mean Field model (HMF) which is a prototypical system
with long-range interactions. The HMF model can be seen as the one
Fourier component of a one-dimensional self-gravitating
system. Interestingly, it exhibits many features of real
self-gravitating systems (violent relaxation, persistence of
metaequilibrium states, slow collisional dynamics, phase
transitions,...) while avoiding complicated problems posed by the
singularity of the gravitational potential at short distances and
by the absence of a large-scale confinement. We stress the deep
analogy between the HMF model and self-gravitating systems by
developing a complete parallel between these two systems. This
allows us to apply many technics introduced in plasma physics and
astrophysics to a new problem and to see how the results depend on
the dimension of space and on the form of the potential of
interaction. This comparative study brings new light in the
statistical mechanics of self-gravitating systems. We also mention
simple astrophysical applications of the HMF model in relation with
the formation of bars in spiral galaxies. 相似文献
33.
Philippe Bouchet Alain Fruchier Grard Joncheray Jose Elguero 《Magnetic resonance in chemistry : MRC》1977,9(12):716-718
The 13C chemical shifts of 17 indazole derivatives are discussed as a function of substituent effects and the N-1—H or N-2—H structure of indazole. The presence in solution of the N-1—H tautomer is confirmed. 相似文献
34.
André Bouchet 《Journal of Combinatorial Theory, Series B》1978,24(1):24-33
Km,n is the complete bipartite graph with m and n vertices in its chromatic classes. G. Ringel has proved that the orientable genus of Km,n is equal to and that its nonorientable genus is equal to . We give new proofs of these results. 相似文献
35.
36.
M. Sc. Markus Schütz Dr. Aude Bouchet Prof. Barbara Chiavarino Prof. Maria Elisa Crestoni Prof. Simonetta Fornarini Prof. Otto Dopfer 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(24):8124-8136
Fluorination of pharmaceutical compounds is a common tool to modulate their physiochemical properties. We determine the effects of site‐specific aromatic fluorine substitution on the geometric, energetic, vibrational, and electronic properties of the protonated neurotransmitter 2‐phenylethylamine (xF‐H+PEA, x=ortho, meta, para) by infrared multiphoton photodissociation (IRMPD) in the fingerprint range (600–1750 cm?1) and quantum chemical calculations at the B3LYP‐D3/aug‐cc‐pVTZ level. The IRMPD spectra of all ions are assigned to their folded gauche conformers stabilized by intramolecular NH+???π hydrogen bonds (H‐bonds) between the protonated amino group and the aromatic ring. H→F substitution reduces the symmetry and allows for additional NH+???F interactions in oF‐H+PEA, leading to three distinct gauche conformers. In comparison to oF‐H+PEA, the fluorination effects on the energy landscape (energy ordering and isomerization barriers) in pF‐H+PEA and mF‐H+PEA with one and two gauche conformers are less pronounced. The strengths of the intramolecular NH+???F and NH+???π bonds are analyzed by the noncovalent interaction (NCI) method. 相似文献
37.
38.
André Bouchet 《Graphs and Combinatorics》1991,7(3):235-252
Isotropic systems are structures which unify some properties of 4-regular graphs and of pairs of dual binary matroids. In this paper we unify the properties of the symmetric Tutte polynomials (i.e. with equal variables) of binary matroids and of the Martin polynomials of 4-regular graphs. For this purpose we introduce the orienting vectors of an isotropic system in order to generalize the eulerian orientations of 4-regular graphs. 相似文献
39.
40.
Competing Insertion and External Binding Motifs in Hydrated Neurotransmitters: Infrared Spectra of Protonated Phenylethylamine Monohydrate 下载免费PDF全文
Hydration has a drastic impact on the structure and function of flexible biomolecules, such as aromatic ethylamino neurotransmitters. The structure of monohydrated protonated phenylethylamine (H+PEA?H2O) is investigated by infrared photodissociation (IRPD) spectroscopy of cold cluster ions by using rare‐gas (Rg=Ne and Ar) tagging and dispersion‐corrected density functional theory calculations at the B3LYP‐D3/aug‐cc‐pVTZ level. Monohydration of this prototypical neurotransmitter gives an insight into the first step of the formation of its solvation shell, especially regarding the competition between intra‐ and intermolecular interactions. The spectra of Rg‐tagged H+PEA?H2O reveal the presence of a stable insertion structure in which the water molecule is located between the positively charged ammonium group and the phenyl ring of H+PEA, acting both as a hydrogen bond acceptor (NH+???O) and donor (OH???π). Two other nearly equivalent isomers, in which water is externally H bonded to one of the free NH groups, are also identified. The balance between insertion and external hydration strongly depends on temperature. 相似文献