Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection

We investigate the charge and spin transport of a voltage-biased superconducting point contact coupled to a nanomagnet. The magnetization of the nanomagnet is assumed to precess with the Larmor frequency, $\omega_L$, due to ferromagnetic resonance. The interplay between the ac Josephson current and the magnetization dynamics leads to spin-polarized Shapiro steps at voltages $|V|=\hbar \omega_L/2en$ for $n=1,2,...$ and the subharmonic steps with $n>1$ are a consequence of multiple Andreev reflection (MAR). Moreover, the spin-precession-assisted MAR generates quasiparticle scattering amplitudes that, due to interference, lead to current-voltage characteristics of the dc charge and spin currents with subharmonic gap structures displaying an even-odd effect.Comment: 5 pages, 4 figure

Capturing Detailed Hand Motion Using the Kinect Sensor and Max-Sum Belief Propagation

Recent research indicates that several neurological diseases that affect motor functions could be diagnosed using analysis of detailed arm and hand motion. This analysis has earlier been carried out manually by looking for certain mo- tion patterns in patients and animals performing a skilled reaching task. In this thesis we investigate the possibility of performing these tests in a more auto- mated fashion by implementing image analysis methods for capturing arm and hand motion data from RGBD recordings. We have used the Microsoft Kinect sensor to capture motion both on a precise level, describing movements around individual joints of the hand, and on a coarser level, finding directions and po- sitions of the lower and upper arm. Our methods take advantage of both the RGB photos, detecting skin colour and finding arm/hand pixels, and the depth images, constructing 3D point clouds that we try to match to a simple geometrical model of the hand. Our approach is to model each phalanx of the hand individually, draw hypotheses for each of these around their pose from the previous frame and then optimize to find the most likely hand configuration using a Belief Propagation based algorithm. We present results from running our algorithms on a few test sequences. The algorithm works well under favourable circumstances but has problems giving the correct pose for example when fingers occlude each other. Possible additions to the framework that might help to overcome these issues are also discussed

Josephson current through a precessing classical spin

International audienceA study of the dc Josephson current between two superconducting leads in the presence of a precessing classical spin is presented. The precession gives rise to a time-dependent tunnel potential which not only implies different tunneling probabilities for spin-up and spin-down quasiparticles, but introduces also a time-dependent spin-flip term. We provide an exact general analytic solution for the out-of-equilibrium steady-state permanent current between two spin-singlet superconductors as a function of the superconducting phase difference, the precession frequency and for arbitrary junction transparency. As an application we focus on the effects of the spin-flip term alone and show that the magnitude and nature of the Josephson current are indeed strongly affected by the precession of the classical spin

Experiential learning processes of exploitation and exploration within and between organisations : an empirical study of product development

This paper empirically examines the relationship between exploitation and exploration in intra- and interorganisational learning processes. Exploitation is about creating reliability in experience and thrives on productivity and refinement. Exploration is about creating variety in experience and thrives on experimenting and innovating. Specifically, the paper explores four learning processes: (a) How intraorganisational exploitation generates interorganisational exploration; (b) how interorganisational exploration generates intraorganisational exploitation; (c) how interorganisational exploitation generates intraorganisational exploration; and (d) how intraorganisational exploration generates interorganisational exploitation. The empirical data consists of two case studies of organisational learning in product development processes of one Scandinavian and one American software producer and their respective interorganisational collaborations with business partners. The findings show how exploitation can be a cause for exploration, and vice versa, that moreover may transcend learning levels. The mechanisms by which such dynamics are generated are discussed. Overall, the framework as proposed in the paper further develops existing theories on organisational learning, by proposing how exploitation and exploration are empirically interlaced within and between organisations

Att studera den ekonomiska eliten : problem och utmaningar

Studying the Economic Elite – Problems and Challenges This article presents my experiences of studying Djursholm as Sweden’s ”Leader Community” during 2010 through 2015. I address the relative lack of studies of the economic elite, which is a problem both for the sociological literature, and for public debate. The reason to why relatively few studies have been made of the economic elite, particularly in Sweden, has amongst others to do with a reputation of it as being hard to study, not at least due to this group's often social closure. By proposing examples from my own study, I try to describe how studies of the economic elites can be done with a view of generating more research of this anonymous yet influential group.Sociologisk Forsknings digitala arkiv</p

Experiential learning processes of exploitation and exploration within and between organisations: an empirical study of product development

This paper empirically examines the relationship between exploitation and exploration in intra- and interorganisational learning processes. Exploitation is about creating reliability in experience and thrives on productivity and refinement. Exploration is about creating variety in experience and thrives on experimenting and innovating. Specifically, the paper explores four learning processes: (a) How intraorganisational exploitation generates interorganisational exploration; (b) how interorganisational exploration generates intraorganisational exploitation; (c) how interorganisational exploitation generates intraorganisational exploration; and (d) how intraorganisational exploration generates interorganisational exploitation. The empirical data consists of two case studies of organisational learning in product development processes of one Scandinavian and one American software producer and their respective interorganisational collaborations with business partners. The findings show how exploitation can be a cause for exploration, and vice versa, that moreover may transcend learning levels. The mechanisms by which such dynamics are generated are discussed. Overall, the framework as proposed in the paper further develops existing theories on organisational learning, by proposing how exploitation and exploration are empirically interlaced within and between organisations.exploitation; exploration; intraorganisational learning; interorganisational learning; case study; product development

Intra- and interorganisational learning processes: an empirical comparison

The organisational learning literature has so far focused primarily on intraorganisational learning processes. However, during the last 10 years or so, a growing number of organisational learning studies have focused explicitly on interorganisational learning. So far this literature has concentrated on the requirements for such learning. Little attention has been devoted to examining the potentially unique dynamics of interorganisational learning processes. Consequently, few if any studies have examined whether interorganisational learning processes differ from traditional intraorganisational learning and, if so, in what respects. The purpose of this paper is to make an empirical comparison between intra- and interorganisational learning processes by drawing on a longitudinal qualitative case study of experiential learning processes within and between a business organisation and its partners, continued over a period of 3 years.Organisational learning Interorganisational learning Intraorganisational learning Experiential learning Strategic alliances Case study

Corporate social responsibility as corporate social control: The case of work-site health promotion

Summary In the past decades work-site health promotion has become an increasingly popular strategy through which corporations and other employers are said to exercise social responsibility. Not only does this practice promise better health and wellbeing for employees; it can also contribute to generating sustainable and responsible organizations. As with all organizational activities we need, however, critically analyze the potential risks for single individuals and societies alike with comprehensive health promotion programs. Any activity of corporate social responsibility (CSR) can potentially be seen as an expression of organizational control through which all the more aspects of an organization's environment come to be enacted by the organization in a way favorable to the organization's aims and perspectives. By clothing an activity as "socially responsible", and more specifically as "health promotion", organizations may accomplish an essential task in a very sublime and efficient way: that of managing its environment in terms of desired and appropriate human behaviors. This unanticipated consequence of health promotion deserves attention in order to even better understand the potentials and pitfalls of modern CSR.Corporate social responsibility Corporate social control Work-site health promotion