The doping dependence of the occupied 3d states at the Mn sites of La1−xSr1+xMnO4 x=0, 0.3, and 0.5 was studied by means of nonresonant hard x-ray emission spectroscopy. For the single-crystalline samples, we observe a linear dichroism of the Mn K main lines 3p to 1s transitions that is strongest for x=0 and decreases with increasing hole doping x. At the same time, the Mn K main lines of polyc...

It is shown that the existence of effective black holes in non-Riemannian vortex acoustics is not forbidden under certain constraints on acoustic torsion vector. In Arnold-BeltramiChildress (ABC) flows only the spatial part acoustic torsion vertical vanish, which allows us to consider constraints on acoustic torsion to obtain artificial non-Riemannian black hole solutions in ABC flows. An expli...

Phase contrast transmission electron microscopy is a powerful tool to enhance the image contrast of transparent materials such as ice-embedded biological specimens and polymer materials. In this method, a phase plate, which is placed at the back-focal plane of the objective lens, gives a phase shift for scattered electron waves, resulting in a significant enhancement contrast of specimens in im...

A simple method for differentiating two similar accelerator-based black hole creation mechanisms – compactified extra dimensions and unparticle-enhanced gravity – is discussed, in light of several properties of black hole thermodynamics. The real-valued scaling dimension dU will induce interactions that mimic those in a universe with (2dU−2)-extra spatial dimensions, and thus provides an altern...

We have measured the near-infrared photoluminescence spectrum of phosphorus doped silicon (Si: P) and extracted the donor-bound exciton (DX) energy at magnetic fields up to 28 T. At high field the Zeeman effect is strongly nonlinear because of the diamagnetic shift, also known as the quadratic Zeeman effect (QZE). The magnitude of the QZE is determined by the spatial extent of the wave-function...

Spatial memory can be strengthened by adverse stimuli that activate the stress system, and administration of the stress hormone corticosterone in close-context with the learning task. Less is known about modulation of spatial memory by post-training positive reinforcers (reward). Cognitive performance was assessed in male C57BL/6J mice using two learning tasks: the water maze (WM) and circular ...

Stress and corticosteroid hormones are known to affect learning and memory processes. In this study, we examined whether stress and corticosteroids are capable of facilitating the switch between multiple memory systems in mice. For this purpose, we designed a task that allowed measurement of nucleus caudate-based stimulus-response and hippocampus-based spatial learning strategies. Naive mice us...

We report a two-step synthesis of highly luminescent CdS/ZnSe core/shell nanocrystals (emission quantum yields up to 50%) that can produce efficient spatial separation of electrons and holes between the core and the shell (type-II localization regime). Our synthesis involves fabrication of cubic-singony CdS core particles that are subsequently overcoated with a layer of ZnSe in the presence of ...

The local and global thermal phase structure for asymptotically anti-de Sitter black holes charged under an abelian gauge group, with both Gauss-Bonnet and quartic field strength corrections, is mapped out for all parameter space. We work in the grand canonical ensemble where the external electric potential is held fixed. The analysis is performed in an arbitrary number of dimensions, for all t...