Properties of the wall impedance of a storage ring are studied for a low relativism, 1 1: Both broad and narrow band impedances are shown to be damped at low energies, the damping factors are found. Coherent motion of a coasting beam is discussed; Landau decrements are calculated.

In the present paper new criteria for classes of FP -injective and weakly quasi-Frobenius rings are given. Properties of both classes of rings are closely linked with embedding of finitely presented modules in fp-flat and free modules respectively. Using these properties, we describe classes of coherent CF and FGF-rings. Moreover, it is proved that the group ring R(G) is FP -injective (resp. we...

In this paper we consider the K-theory of smooth algebraic stacks, establish λ and Adams operations and show that the higher K-theory of such stacks is always a pre-λ-ring and is a λ-ring if every coherent sheaf is the quotient of a vector bundle. As a consequence we are able to define Adams operations and absolute cohomology for smooth algebraic stacks satisfying this hypothesis. We also defin...

The classes of FP -injective and weakly quasi-Frobenius rings are investigated. The properties for both classes of rings are closely linked with embedding of finitely presented modules in fp-flat and free modules respectively. Using these properties, we characterize the classes of coherent CF and FGF-rings. Moreover, it is proved that the group ring R(G) is FP -injective (weakly quasi-Frobenius...

We consider the dynamics of muons injected into the g-2 ring now under construction at FERMILAB. We present the concept for the pulsed injection kicker magnet that optimizes capture efficiency and minimizes coherent betatron oscillations of stored muons. Some engineering details of the high voltage kicker and pulser are presented.

In this paper, we evaluate Scalable Coherent Interface (SCI) as avionics real-time network. An OPNET based SCI node model is established. The results of our preliminary experiments show that a certain utilization of network load should be maintained in order to guarantee the timely delivery of real-time messages in avionics system where basic SCI ring is adopted.

Preserving multicentennial climate variability in long tree-ring records is critically important for reconstructing the full range of temperature variability over the past 1000 years. This allows the putative "Medieval Warm Period" (MWP) to be described and to be compared with 20th-century warming in modeling and attribution studies. We demonstrate that carefully selected tree-ring chronologies...

Let C+ := {s ∈ C | Re(s) ≥ 0} and let A denote the ring A = ( s(∈ C+) 7→ b fa(s) + ∞ X k=0 fke −stk ̨̨̨̨ fa ∈ L(0,∞), (fk)k≥0 ∈ `, 0 = t0 < t1 < t2 < . . . ) equipped with pointwise operations. (Here b· denotes the Laplace transform.) It is shown that the ring A is not coherent, answering a question of Alban Quadrat [6, p. 30]. In fact, we present two principal ideals in the domain A whose intersec...

The transfer of charge between different regions of a phase-coherent mesoscopic sample is investigated. Charge transfer from a side branch quantum dot into a ring changes the persistent current through a sequence of plateaus of diamagnetic and paramagnetic states. In contrast, a quantum dot embedded in a ring exhibits sharp resonances in the persistent current, whose sign is independent of the ...

Direct numerical simulation is used to study the effect of crossflow on the dynamics, entrainment and mixing characteristics of vortex rings issuing from a circular nozzle. Three distinct regimes exist, depending on the velocity ratio (ratio of the average nozzle exit velocity to free-stream crossflow velocity) and stroke ratio (ratio of stroke length to nozzle exit diameter). Coherent vortex r...