150 research outputs found
What is Helpful: The Client’s Perception of the Solution-Focused Brief Therapy Process by Level of Engagement
The current study aimed to explore what elements from the solution-focused brief therapy (SFBT) process clients perceive as helpful and how their perception varies by level of engagement. The replication of the SFBT model from the perspective of clients residing outside the USA was also examined. A mixed-method design was used in a naturalistic setting in Poland. Clients (N = 346; 74% females) aged 18 to 67 attending psychotherapy in private practice were interviewed. Thematic analysis revealed eleven main themes. The SFBT-specific themes replicated the original model, yet a more ordered organization of core elements emerged than currently existing ones. The elements perceived as helpful significantly varied by the level of engagement. The two generic themes identified suggest that allowing the client to talk things out while working toward awareness and understanding is an essential environment in which the solution-focused co-construction process takes place
Notch Signalling: The Multitask Manager of Inner Ear Development and Regeneration
Notch signalling is a major regulator of cell fate decisions and tissue patterning in metazoans. It is best known for its role in lateral inhibition, whereby Notch mediates competitive interactions between cells to limit adoption of a given developmental fate. However, it can also function by lateral induction, a cooperative mode of action that was originally described during the patterning of the Drosophila wing disc and creates boundaries or domains of cells of the same character. In this chapter, we introduce these two signalling modes and explain how they contribute to distinct aspects of the development and regeneration of the vertebrate inner ear, the organ responsible for the perception of sound and head movements. We discuss some of the factors that could influence the context-specific outcomes of Notch signalling in the inner ear and the ongoing efforts to target this pathway for the treatment of hearing loss and vestibular dysfunction
A gradient of Wnt activity positions the neurosensory domains of the inner ear
The auditory and vestibular organs of the inner ear and the neurons that innervate them originate from Sox2-positive and Notch-active neurosensory domains specified at early stages of otic development. Sox2 is initially present throughout the otic placode and otocyst, then it becomes progressively restricted to a ventro-medial domain. Using gain and loss-of-function approaches in the chicken otocyst, we show that these early changes in Sox2 expression are regulated in a dose-dependent manner by Wnt/beta-catenin signalling. Both high and very low levels of Wnt activity repress Sox2 and neurosensory competence. However, intermediate levels allow the maintenance of Sox2 expression and sensory organ formation. We propose that a dorso-ventral (high-to-low) gradient and wave of Wnt activity initiated at the dorsal rim of the otic placode progressively restricts Sox2 and Notch activity to the ventral half of the otocyst, thereby positioning the neurosensory competent domains in the inner ear
Investigation of sequential cryogenic hard turning and ball burnishing processes
This paper presents a sequential machining process which incorporates CBN hard turning with cryogenic pre-cooling of the workpiece (CHT) and ball burnishing (BB). The main goal of this study was to select machining conditions enhancing the quality of parts machined by hard turning including the surface roughness Ra of about 0,2 μm, good bearing properties and reducing the white layer. Changes of surface roughness, surface texture, microstructure alterations and micro-hardness distribution are discusses
Universal quantum computation with ordered spin-chain networks
It is shown that anisotropic spin chains with gapped bulk excitations and
magnetically ordered ground states offer a promising platform for quantum
computation, which bridges the conventional single-spin-based qubit concept
with recently developed topological Majorana-based proposals. We show how to
realize the single-qubit Hadamard, phase, and pi/8 gates as well as the
two-qubit CNOT gate, which together form a fault-tolerant universal set of
quantum gates. The gates are implemented by judiciously controlling Ising
exchange and magnetic fields along a network of spin chains, with each
individual qubit furnished by a spin-chain segment. A subset of single-qubit
operations is geometric in nature, relying on control of anisotropy of spin
interactions rather than their strength. We contrast topological aspects of the
anisotropic spin-chain networks to those of p-wave superconducting wires
discussed in the literature.Comment: 9 pages, 3 figure
Wave function engineering in quantum dot-ring nanostructures
Modern nanotechnology allows producing, depending on application, various
quantum nanostructures with the desired properties. These properties are
strongly influenced by the confinement potential which can be modified, e.g.,
by electrical gating. In this paper we analyze a nanostructure composed of a
quantum dot surrounded by a quantum ring. We show that depending on the details
of the confining potential the electron wave functions can be located in
different parts of the structure. Since the properties of such a nanostructure
strongly depend on the distribution of the wave functions, varying the applied
gate voltage one can easily control them. In particular, we illustrate the high
controllability of the nanostructure by demonstrating how its coherent,
optical, and conducting properties can be drastically changed by a small
modification of the confining potential.Comment: 8 pages, 10 figures, 2 tables, revte
Scanning Tunneling Microscope Operating as a Spin-diode
We theoretically investigate spin-polarized transport in a system composed of
a ferromagnetic Scanning Tunneling Microscope (STM) tip coupled to an adsorbed
atom (adatom) on a host surface. Electrons can tunnel directly from the tip to
the surface or via the adatom. Since the tip is ferromagnetic and the host
surface (metal or semiconductor) is non-magnetic we obtain a spin-diode effect
when the adatom is in the regime of single occupancy. This effect leads to an
unpolarized current for direct bias (V > 0) and polarized current for reverse
(V < 0) bias voltages, if the tip is nearby the adatom. Within the
nonequilibrium Keldysh technique we analyze the interplay between the lateral
displacement of the tip and the intra adatom Coulomb interaction on the
spindiode effect. As the tip moves away from the adatom the spin-diode effect
vanishes and the currents become polarized for both V > 0 and V < 0. We also
find an imbalance between the up and down spin populations in the adatom, which
can be tuned by the tip position and the bias. Finally, due to the presence of
the adsorbate on the surface, we observe spin-resolved Friedel oscillations in
the current, which reflects the oscillations in the calculated LDOS of the
subsystem surface+adatom.Comment: 11 pages, 4 figures. Submitte
Modelling of non-metallic particles motion process in foundry alloys
The behaviour of non-metallic particles in the selected composites was analysed, in the current study. The calculations of particles floating in liquids differing in viscosity were performed. Simulations based on the Stokes equation were made for spherical SiC particles and additionally the particle size influence on Reynolds number was analysed.The movement of the particles in the liquid metal matrix is strictly connected with the agglomerate formation problem.Some of collisions between non-metallic particles lead to a permanent connection between them. Creation of the two spherical particles and a metallic phase system generates the adhesion force. It was found that the adhesion force mainly depends on the surface tension of the liquid alloy and radius of non-metallic particles
Modeling of MnS precipitation during the crystallization of grain oriented silicon steel
The process of manganese sulfide formation in the course of grain-oriented silicon steel solidification process is described in the paper. Fine dispersive MnS inclusions are grain growth inhibitors and apart from AlN inclusions they contribute to the formation of a privileged texture, i.e. Goss texture. A computer simulation of a high-silicon steel ingot solidification with the use of author’s software has been performed. Ueshima model was adapted for simulating the 3 % Si steel ingot solidification. The calculations accounted for the back diffusion effect according to Wołczyński equation. The computer simulation results are presented in the form of plots representing the process of steel components segregation in a solidifying ingot and curves illustrating the inclusion separation process
Modelling of the crystallization front – particles interactions in ZnAl/(SiC)p composites
The presented work focuses on solid particle interactions with the moving crystallization front during a solidification of the metal matrix composite. The current analyses were made for silicon carbide particles and ZnAl alloy with different additions of aluminium. It was found, that the chemical composition of the metal matrix influences the behaviour of SiC particles. At the same time calculations of the forces acting on a single particle near the crystallization front were performed. For each alloy type the critical conditions that determine whether particle will be absorbed or pushed, were specified
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