Hard exclusive photoproduction of Φ\Phi and J/ΨJ/\Psi mesons

We present predictions for differential cross sections for the reaction $\gamma p \to \Phi p$ and give an outlook to which extent our calculations may be generalized to the photoproduction of $J/\Psi$ mesons. Our results are obtained within perturbative QCD treating the proton as a quark-diquark system.Comment: 4 pages, 1 figure, uses Elsevier style espcrc1.st

Witten index, axial anomaly, and Krein's spectral shift function in supersymmetric quantum mechanics

A new method is presented to study supersymmetric quantum mechanics. Using relative scattering techniques, basic relations are derived between Krein’s spectral shift function, the Witten index, and the anomaly. The topological invariance of the spectral shift function is discussed. The power of this method is illustrated by treating various models and calculating explicitly the spectral shift function, the Witten index, and the anomaly. In particular, a complete treatment of the two‐dimensional magnetic field problem is given, without assuming that the magnetic flux is quantized

Revolutionary opportunities for materials and structures study

The revolutionary opportunities for materials and structures study was performed to provide Government and Industry focus for advanced materials technology. Both subsonic and supersonic engine studies and aircraft fuel burn and DOC evaluation are examined. Year 2010 goal materials were used in the advanced engine studies. These goal materials and improved component aero yielded subsonic fuel burn and DOC improvements of 13.4 percent and 5 percent, respectively and supersonic fuel burn and DOC improvements of 21.5 percent and 18 percent, respectively. Conclusions are that the supersonic study engine yielded fuel burn and DOC improvements well beyond the program goals; therefore, it is appropriate that advanced material programs be considered

Switched Control of Electron Nuclear Spin Systems

In this article, we study control of electron-nuclear spin dynamics at magnetic field strengths where the Larmor frequency of the nucleus is comparable to the hyperfine coupling strength. The quantization axis for the nuclear spin differs from the static B_0 field direction and depends on the state of the electron spin. The quantization axis can be switched by flipping the state of electron spin, allowing for universal control on nuclear spin states. We show that by performing a sequence of flips (each followed by a suitable delay), we can perform any desired rotation on the nuclear spins, which can also be conditioned on the state of the electron spin. These operations, combined with electron spin rotations can be used to synthesize any unitary transformation on the coupled electron-nuclear spin system. We discuss how these methods can be used for design of experiments for transfer of polarization from the electron to the nuclear spins

A comparison of Random Set and Point Estimate Methods in Finite Element Analysis of Tunnel Excavation

Risk and Reliability in Geotechnical Engineerin

Dikvarkovi kao efektivne čestice u tvrdom ekskluzivnom raspršenju

In the context of hard hadronic reactions, diquarks are a useful phenomenological device to model non-perturbative effects still observable in the kinematic range accessible by present-day experiments. In the following, we present diquark-model predictions for γγ → p¯p and ΛΛ. We also sketch how the (pure quark) hard-scattering formalism for exclusive reactions involving baryons can be reformulated in terms of quarks and diquarks. As an application of these considerations, we analyze the magnetic proton form factor with regard to its quark-diquark content.Dikvarkovi su pogodna fenomenološka zamisao u razmatranju tvrdih hadronskih reakcija za modeliranje neperturbativnih efekata koji se opažaju u današnjim mjerenjima dostupnom kinematičkom području. Prikazuju se predviđanja dikvarkovskog modela za γγ → pp¯ i ΛΛ. Opisuje se kako se formalizam (čisto kvarkovskog) tvrdog raspršenja koja uključuju barione može prikazati pomoću kvarkova i dikvarkova. U primjeni tih razmatranja analizira se magnetski faktor oblika protona za sadržaj kvarkova i dikvarkova u protonu

Visualisation of ectomycorrhizal rhizomorph structure using laser scanning confocal microscopy

A method for the observation of the three-dimensional structure of intact ectomycorrhizal rhizomorphs is described. The method is based on a combination of clearing the material with KOH followed by staining with congo red and subsequent imaging under a laser scanning confocal microscope (LSCM). The images obtained are of a much higher three-dimensional resolution than those obtained previously by use of conventional light microscopical techniques. The structure of highly differentiated and undifferentiated rhizomorphs is described. Applications of the method are briefly discussed

Dikvarkovi kao efektivne čestice u tvrdom ekskluzivnom raspršenju

In the context of hard hadronic reactions, diquarks are a useful phenomenological device to model non-perturbative effects still observable in the kinematic range accessible by present-day experiments. In the following, we present diquark-model predictions for γγ → p¯p and ΛΛ. We also sketch how the (pure quark) hard-scattering formalism for exclusive reactions involving baryons can be reformulated in terms of quarks and diquarks. As an application of these considerations, we analyze the magnetic proton form factor with regard to its quark-diquark content.Dikvarkovi su pogodna fenomenološka zamisao u razmatranju tvrdih hadronskih reakcija za modeliranje neperturbativnih efekata koji se opažaju u današnjim mjerenjima dostupnom kinematičkom području. Prikazuju se predviđanja dikvarkovskog modela za γγ → pp¯ i ΛΛ. Opisuje se kako se formalizam (čisto kvarkovskog) tvrdog raspršenja koja uključuju barione može prikazati pomoću kvarkova i dikvarkova. U primjeni tih razmatranja analizira se magnetski faktor oblika protona za sadržaj kvarkova i dikvarkova u protonu