General solution of RG equations in the framework of background perturbation theory is written down in the large Nc limit. A simplified (model) approximation to the general solution is suggested which allows to write β(α) and α(β) to any loop order. The resulting αB(Q 2) coincides asymptotically at large |Q2| with standard (free) αs, saturates at small Q2 ≥ 0 and has poles at time-like Q2 in ag...

The mammalian rod transfers a binary signal, the capture of 0 or 1 photon. In this issue of Neuron, Sampath and Rieke show in mouse that the rod's tonic exocytosis in darkness completely saturates a G protein cascade to close nearly all postsynaptic channels. A full-sized photon event supresses exocytosis sufficiently to allow approximately 30 postsynaptic channels to open simultaneously. Thus,...

We show that the fidelity decay between an initial eigenstate evolved under a unitary chaotic operator and the same eigenstate evolved under a perturbed operator saturates well before the 1=N limit expected for a generic initial state, where N is the dimension of the Hilbert space. We provide a theoretical argument and numerical evidence that, for perturbations of intermediate strength, the sat...

Spin-sensitive bleaching of the absorption of far-infrared radiation has been observed in p-type GaAs/AlGaAs quantum well structures. The absorption of circularly polarized radiation saturates at lower intensities than that of linearly polarized light due to monopolar spin orientation in the first heavy-hole subband. Spin relaxation times of holes in p-type material in the range of tens of ps w...

The goal of this laboratory activity is to introduce some improvements to the speed PI control system designed in the laboratory activity 2. The improvements consist in the implementation of an anti– windup scheme to reduce the large overshoot occurring in the step response when the controller output saturates, and a friction plus inertia feedforward compensator, which allows to enhance both th...

We tested the hypothesis that rod signals mediate the effect of luminance on field prevalence in binocular rivalry. Results show that (1) field prevalence saturates at a luminance that is less than 0.001 that of the value reported for rod saturation, (2) the spectral sensitivity inferred from the prevalence-luminance relationship is not scotopic, and (3) the prevalence-luminance relationship do...

Coherent π0 photoand electroproduction on 4He and 12C nuclei is investigated in the framework of a distorted wave impulse approximation in momentum space. The elementary process is described by the recently developed unitary isobar model. Medium effects are considered by introducing a phenomenological ∆ self-energy. The recent experimental data for 4He and 12C can be well described over a wide ...

Integral is material that difficult to understand for class XII SMA students. The long completion procedure saturates students and takes a time. solution this problem by applying the Fash Method learning. purpose of study was determine role integral fash method learning design in understanding mathematical concepts. research descriptive research. results show can motivate solve problems correct...

Using the technique of double high-speed photography method, we show that an external magnetic field triggers in GdFeCo domain wall motion with velocities up to 1.2 km/s. The velocity saturates increase driving field. Contrary earlier experiments on iron garnets, did not succeed detect any effect femtosecond laser pulses velocity, even if were strong enough reverse magnetization. Keywords: ferr...

The aim of the study was to investigate whether proposed dietary scores of atherogenicity and thrombogenicity predict ischaemic heart disease (IHD) risk in a community sample of men aged 45-59 years. Dietary scores were calculated from consumption of various fatty acids, estimated from 7 d weighed intake data obtained from 665 men. Investigation of associations with blood lipids, lipoproteins a...