Search results for "Hall"

Sähköisen taloushallinnon kehityksen merkitys tilintarkastuksessa

2016

Tutkimuksessa analysoidaan Suomessa tapahtunutta muutosta tilintarkastustyön painopisteissä taloushallinnon digitalisoitumisen myötä. Tutkimuksen teoriana toimii agenttiteoria ja tilintarkastusta koskeva ajantasainen lainsäädäntö yhdessä tilintarkastusta ohjaavien normien, hyvän tilintarkastustavan ja kansainvälisten standardien kanssa. Vaikka taloushallinnon toimintaympäristössä voidaankin nähdä radikaali muutos, ei tilintarkastajan työ ole kohdannut suuria muutoksia viimeisen kuudentoista vuoden aikana. Kun tarkastellaan tilintarkastusta käytännön työn, tilintarkastusta säätelevän lainsäädännön näkökulmasta, huomataan tilintarkastustyön pysyneen verrattain samanlaisena. Käytännön tilintar…

Suomalaisen laitospsykiatrian historiaa

2022

Willem Boshoff, artist's monograph and catalogue

2013

Willem Boshoff’s work articulates around a pivotal date, April 1994, the first democratic elections in South Africa. He may choose to work gigantic rocks of granite or establish vast installations of accumulated material. The artist claims that his work is based on language, often taking the form of Dictionaries. While reviewing the main questions by artists of the twentieth century, texts or artworks from Europe are systematically tested against their South African counterpart. Boshoff’s attitude is determined by a melancholic questioning of his role as a creator linked to a political situation and cultural milieu. He discovers more dynamic ways of presenting gestures when his artistic act…

The tsunami phenomenon

2017

Abstract With human activity increasingly concentrating on coasts, tsunamis (from Japanese tsu = harbour, nami = wave) are a major natural hazard to today’s society. Stimulated by disastrous tsunami impacts in recent years, for instance in south-east Asia (2004) or in Japan (2011), tsunami science has significantly flourished, which has brought great advances in hazard assessment and mitigation plans. Based on tsunami research of the last decades, this paper provides a thorough treatise on the tsunami phenomenon from a geoscientific point of view. Starting with the wave features, tsunamis are introduced as long shallow water waves or wave trains crossing entire oceans without major energy l…

Spectroscopic analysis of vibronic relaxation pathways in molecular spin qubit [Ho(W5O18)2]9−: sparse spectra are key

2021

Molecular vibrations play a key role in magnetic relaxation processes of molecular spin qubits as they couple to spin states, leading to the loss of quantum information. Direct experimental determination of vibronic coupling is crucial to understand and control the spin dynamics of these nano-objects, which represent the limit of miniaturization for quantum devices. Herein, we measure the vibrational properties of the molecular spin qubit $[$Ho(W$_5$O$_{18}$)$_2]^{9-}$ by means of magneto-infrared spectroscopy. Our results allow us to unravel the vibrational decoherence pathways in combination with $ab$ $initio$ calculations including vibronic coupling. We observe field-induced spectral cha…

Magnons at low excitations: Observation of incoherent coupling to a bath of two-level systems

2019

Collective magnetic excitation modes, magnons, can be coherently coupled to microwave photons in the single excitation limit. This allows for access to quantum properties of magnons and opens up a range of applications in quantum information processing, with the intrinsic magnon linewidth representing the coherence time of a quantum resonator. Our measurement system consists of a yttrium iron garnet (YIG) sphere and a three-dimensional (3D) microwave cavity at temperatures and excitation powers typical for superconducting quantum circuit experiments. We perform spectroscopic measurements to determine the limiting factor of magnon coherence at these experimental conditions. Using the input-o…

Domain wall junctions in a generalized Wess-Zumino model

1999

We investigate domain wall junctions in a generalized Wess-Zumino model with a Z(N) symmetry. We present a method to identify the junctions which are potentially BPS saturated. We then use a numerical simulation to show that those junctions indeed saturate the BPS bound for N=4. In addition, we study the decay of unstable non-BPS junctions.

Beyond ideal two-dimensional metals: Edges, vacancies, and polarizabilities

2018

Recent experimental discoveries of graphene-stabilized patches of two-dimensional (2D) metals have motivated also their computational studies. However, so far the studies have been restricted to ideal and infinite 2D metallic monolayers, which is insufficient because in reality the properties of such metallic patches are governed by microstructures pervaded by edges, defects, and several types of perturbations. Here we use density-functional theory to calculate edge and vacancy formation energies of hexagonal and square lattices of 45 elemental 2D metals. We find that the edge and vacancy formation energies are strongly correlated and decrease with increasing Wigner-Seitz radii, analogously…

Optical properties of wurtzite GaN/AlN quantum dots grown on non-polar planes: the effect of stacking faults in the reduction of the internal electri…

2016

The optical emission of non-polar GaN/AlN quantum dots has been investigated. The presence of stacking faults inside these quantum dots is evidenced in the dependence of the photoluminescence with temperature and excitation power. A theoretical model for the electronic structure and optical properties of non-polar quantum dots, taking into account their realistic shapes, is presented which predicts a substantial reduction of the internal electric field but a persisting quantum confined Stark effect, comparable to that of polar GaN/AlN quantum dots. Modeling the effect of a 3 monolayer stacking fault inside the quantum dot, which acts as zinc-blende inclusion into the wurtzite matrix, result…

Single device offset-free magnetic field sensing principle with tunable sensitivity and linear range based on spin-orbit-torques

2023

We propose a novel device concept using spin-orbit-torques to realize a magnetic field sensor, where we eliminate the sensor offset using a differential measurement concept. We derive a simple analytical formulation for the sensor signal and demonstrate its validity with numerical investigations using macrospin simulations. The sensitivity and the measurable linear sensing range in the proposed concept can be tuned by either varying the effective magnetic anisotropy or by varying the magnitude of the injected currents. We show that undesired perturbation fields normal to the sensitive direction preserve the zero-offset property and only slightly modulate the sensitivity of the proposed sens…