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排序方式: 共有91条查询结果,搜索用时 31 毫秒
11.
Jonathan R. Gaunt Chun-Hay Kom Anna Kulesza W. James Stirling 《The European Physical Journal C - Particles and Fields》2010,69(1-2):53-65
We study the production of same-sign W boson pairs at the LHC in double parton interactions. Compared with simple factorised double parton distributions (dPDFs), we show that the recently developed dPDFs, GS09, lead to non-trivial kinematic correlations between the W bosons. A numerical study of the prospects for observing this process using same-sign dilepton signatures, including W ± W ± jj, diboson and heavy flavour backgrounds, at 14 TeV centre-of-mass energy is then performed. It is shown that a small excess of same-sign dilepton events from double parton scattering over a background dominated by single scattering W ± Z(γ *) production could be observed at the LHC. 相似文献
12.
Gas‐phase conformations of capistruin – comparison of lasso,branched‐cyclic and linear topologies
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Ernst A Makowski O Kowalewska B Miecznikowski K Kulesza PJ 《Bioelectrochemistry (Amsterdam, Netherlands)》2007,71(1):23-28
Fabrication of structured film (on glassy carbon substrate) composed of compact Prussian Blue (that has been prepared by alternate immersions and through assembling within ultra-thin layers of 4(pyrrole-1-yl)-benzoic acid, PPyBA) and poly(3,4-ethylendioxythiophene), PEDOT, is described. This functionalized film has been characterized by fast charge propagation, and it has served as a redox conducting template for permanent attachment of a model enzyme, horseradish peroxidase, HRP. The resulting organic-inorganic system acts as an effective hybrid bioelectrocatalyst for electroreduction of hydrogen peroxide, a model reactant for biosensors and biofuel cells. Among important issues are rigidity, permanence of enzyme attachment, morphology, hydrophilicity, and attractive mediating capabilities of the PEDOT-stabilized Prussian Blue based structured film. 相似文献
15.
Photoabsorption and photofragmentation of isolated cationic silver cluster-tryptophan hybrid systems
Mitrić R Petersen J Kulesza A Bonacić-Koutecký V Tabarin T Compagnon I Antoine R Broyer M Dugourd P 《The Journal of chemical physics》2007,127(13):134301
We present a theoretical study of the size and structure selective absorption properties of cationic silver cluster-tryptophan Trp-Ag(n)(+) (n = 2-5,9) hybrid systems supported by photofragmentation experiments. Our time-dependent density functional theory calculations provide insight into the nature of excitations in interacting nanoparticle-biomolecule subunits and allow to determine characteristic spectral features as fingerprints of two different classes of structures: charge solvated and zwitterionic. Moreover, different types of charge transfer transitions have been identified. Charge transfer from pi system of tryptophan to silver cluster occurs for charge solvated structures while charge transfer from silver to the NH(3) (+) group takes place for zwitterionic structures. This has been confirmed by experimentally measured photofragmentation channels and molecular dynamics simulations. Our findings provide fundamental insight into the structure- and size-dependent mechanism responsible for the enhanced absorption and emission in nanoparticle-biomolecular hybrid systems. 相似文献
16.
Maciej Dawidowski Sławomir Sobczak Marcin Wilczek Artur Kulesza Jadwiga Turło 《Molecular diversity》2014,18(1):61-77
Various symmetrical and unsymmetrical ketones were successfully coupled with secondary amino acids in the course of Ugi five-center, four-component reaction (U-5C-4CR), thus expanding the molecular diversity possible to be achieved by the reaction. The chemical yields depended on the degree of hindrance of the components employed and were satisfactory in view of possible steric interactions in the U-5C-4CR zwitterionic intermediate. The sense of diastereoinduction for reactions employing unsymmetrical ketones was examined by converting the resulting Ugi adducts into the corresponding rigid 2,6-diketopiperazine derivatives. 相似文献
17.
This problem (proposed for the 4th International Symposium on Applied Stochastic Models and Data Analysis) concerns an exploratory study related to the presently accepted hypothesis that temporal curves of the forced pulse luminescence of specialized blood cells, granulocytes, may indicate the level of effectiveness of the immunological system. This paper presents a new set of empirical data and an analysis of its structure. 相似文献
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D. Kulesza M. Sobczyk J. Legendziewicz O. M. Moroz V. M. Amirkhanov 《Structural chemistry》2010,21(2):425-438
Lanthanide β-diketones and their derivatives are extensively studied coordination compounds, due to their luminescent properties
and many possible applications. The tetrakisNd(III) complex with phosphorylated sulfonylamides derivatives of β-diketones
was synthesized. The X-ray diffraction showed that the compound of formula {[Na[Ln(SP)4]}
n
(SP = C6H5S(O)2NP(O)(OCH3)2; Ln = Nd(III) crystallize in the monoclinic P21/c space group with the following unit-cell parameters: a = 22.006(4)A, b = 11.075(2)A, c = 22.334(5)A, and β = 118.71(3)°. The molecular structure of the investigated compound is polymeric. The lanthanide ions
as well as the sodium ions are coordinated by sulfonyl and phosphoryl groups of the ligand, and because of the bridging behavior,
link different units of the polymer. High-resolution absorption, emission, and excitation spectra of neodymium crystals were
measured at 298, 77, and 4K temperatures. The sensitized emission of [Na[Nd(III)(L)4]}
n
chelate in the IR range of the spectrum was recorded. This kind of the compounds can be used in organic light emitting diodes
in compact display technology. The spectral characteristic of the compound is controlled by donor–acceptor properties and
electron-hole transporting chemical groups. Those factors affect the energy level location, energy transfer (ET), electron–phonon
coupling, and finally the luminescence quantum yield. The optical behavior of the title compound was characterised by crystal
field (CF), correlation crystal field (CCF), and electron transition probability calculations. X-ray structural data and the
nephelauxetic effect check the role of the character of the bonding. The IR spectra were used to analyze the vibronic components
in electronic transitions. The role of ligands, singlet and triplet states in energy transfer, are discussed. The ET mechanism
and emission quenching pathways are proposed. Some spectroscopic parameters will be compared with earlier reported NaNdWo4 × H2O (Wo = CCl3 CONPO(OCH3)2). 相似文献