"Some of us need to be taken care of": young adults' perspectives on support and help in drug reducing interventions in coercive contexts in Denmark and the UK

This paper provides an account of young people’s experiences of and perspectives on help and support in drug reducing interventions. It is based on interviews with young people age 14–25 who were in contact with the Criminal Justice System (CJS) and, at the same time, participated in a drug reducing intervention. The interview data forms part of the EU funded EPPIC project. Two main themes emerged from the young peoples’ accounts that cut across different types of interventions and social systems in both countries. The first revolves around the ‘system’ of welfare, criminal justice, health and educational services and the barriers young people encountered in navigating the system to find help. The second revolves around the young people’s experiences with professionals, including what they appreciated and what they found problematic in professionals’ approach to them. Basing our analysis on data from two different countries, we are able to emphasize similarities in the young peoples’ perspectives, despite being enrolled in different drug reducing and CJS interventions. The insights gained indicate a need for systems and service changes that can facilitate a better balance between building individual resilience and providing appropriate, timely and adequate support within a ‘resilience-building environmen

'I like money, I like many things'. The relationship between drugs and crime from the perspective of young people in contact with criminal justice systems

Based on research undertaken as part of the EU funded EPPIC project, this paper aims to update and elaborate on the relationship between drug use and offending behaviours by exploring variations within a cross-national sample of drug-experienced young people in touch with criminal justice systems. Adopting a trajectory-based approach, interviews were undertaken with 198 young people aged 15–25 in six European countries (Austria, Denmark, Germany, Italy, Poland, and UK). Data were analysed by applying the Bennett and Holloway categorization of the drugs-crime link, with a focus on the concept of social exclusion as developed by Seddon. Three main types of mechanisms (economic, pharmaceutical, and lifestyles) are used to interpret the data, showing how the relationship between drugs and offending can vary according to type of substances and over time. Furthermore, it can be associated with very different degrees of social exclusion and needs. The results suggest that while economic inequalities still play key roles in explaining drug use and offending, both behaviours can originate from a state of relative deprivation, resulting from the contradictions inherent in ‘bulimic societies’ that raise aspirations and desires while providing young people scarce opportunities for self-realisation and social recognition

On the infimum attained by a reflected L\'evy process

This paper considers a L\'evy-driven queue (i.e., a L\'evy process reflected at 0), and focuses on the distribution of $M(t)$, that is, the minimal value attained in an interval of length $t$ (where it is assumed that the queue is in stationarity at the beginning of the interval). The first contribution is an explicit characterization of this distribution, in terms of Laplace transforms, for spectrally one-sided L\'evy processes (i.e., either only positive jumps or only negative jumps). The second contribution concerns the asymptotics of \prob{M(T_u)> u} (for different classes of functions $T_u$ and $u$ large); here we have to distinguish between heavy-tailed and light-tailed scenarios

A new endstation for extreme-ultraviolet spectroscopy of free clusters and nanodroplets

We present a new endstation for the AMOLine of the ASTRID2 synchrotron at Aarhus University, which combines a cluster and nanodroplet beam source with a velocity map imaging and time-of-flight spectrometer for coincidence imaging spectroscopy. Extreme-ultraviolet spectroscopy of free nanoparticles is a powerful tool for studying the photophysics and photochemistry of resonantly excited or ionized nanometer-sized condensed-phase systems. Here we demonstrate this capability by performing photoelectron-photoion coincidence (PEPICO) experiments with pure and doped superfluid helium nanodroplets. Different doping options and beam sources provide a versatile platform to generate various van der Waals clusters as well as He nanodroplets. We present a detailed characterization of the new setup and present examples of its use for measuring high-resolution yield spectra of charged particles, time-of-flight ion mass spectra, anion-cation coincidence spectra, multi-coincidence electron spectra and angular distributions. A particular focus of the research with this new endstation is on intermolecular charge and energy-transfer processes in heterogeneous nanosystems induced by valence-shell excitation and ionization.Comment: 28 pages, 17 figures, submitted to Review of Scientific Instrument

Stakeholder ownership: a theoretical framework for cross national understanding and analyses of stakeholder involvement in issues of substance use, problem use and addiction

This project contributes to understanding of the role of different stakeholder groups in the formulation and implementation of policy in the addictions field in Austria, Denmark, Finland, Italy, Poland and the UK. It comprises a number of case studies which draw on a range of theoretical frameworks to examine stakeholder dynamics at international, national and local levels. Mainly qualitative methods were used: interviews, policy and documentation analyses, webcrawler network analysis, and simple surveys; one case study was based on a survey only. The case studies fall into four main categories: three focus on controversial issues in drug treatment policy and practice – opioid substitution treatment, drug consumption rooms, and heroin assisted treatment; three look at stakeholder activity in alcohol control and public health; one pilot case study considers the potential role of researchers in the development of a scientific network around gambling; and one looks at the role of nurses in implementing brief interventions. In addition, themes explored across case studies included the role of evidence and stakeholder activity, drug users as stakeholders, and the role of external stakeholders on national policy. Professional stakeholders at implementation level and families and drug users as stakeholders are also considered. The case studies revealed that, in many instances, the addictions field is characterised by tensions between groups, by entrenched relationships between some addiction-specific stakeholder groups and powerful political stakeholders, and by the dominance of some forms of evidence over other forms of knowledge. Science and scientists are only influential in policy terms if their scientific findings ‘fit’ with the wider political context. Nevertheless, at least within the European context, there are opportunities for new stakeholder groups to emerge and gain policy salience and there are opportunities for stakeholders to challenge prevailing frames of understanding the addictions and prevailing modes of responding to problems of substance misuse and addiction

Quantum algorithm and circuit design solving the Poisson equation

The Poisson equation occurs in many areas of science and engineering. Here we focus on its numerical solution for an equation in d dimensions. In particular we present a quantum algorithm and a scalable quantum circuit design which approximates the solution of the Poisson equation on a grid with error \varepsilon. We assume we are given a supersposition of function evaluations of the right hand side of the Poisson equation. The algorithm produces a quantum state encoding the solution. The number of quantum operations and the number of qubits used by the circuit is almost linear in d and polylog in \varepsilon^{-1}. We present quantum circuit modules together with performance guarantees which can be also used for other problems.Comment: 30 pages, 9 figures. This is the revised version for publication in New Journal of Physic

A mathematical model for fibro-proliferative wound healing disorders

The normal process of dermal wound healing fails in some cases, due to fibro-proliferative disorders such as keloid and hypertrophic scars. These types of abnormal healing may be regarded as pathologically excessive responses to wounding in terms of fibroblastic cell profiles and their inflammatory growth-factor mediators. Biologically, these conditions are poorly understood and current medical treatments are thus unreliable. In this paper, the authors apply an existing deterministic mathematical model for fibroplasia and wound contraction in adult mammalian dermis (Olsenet al., J. theor. Biol. 177, 113–128, 1995) to investigate key clinical problems concerning these healing disorders. A caricature model is proposed which retains the fundamental cellular and chemical components of the full model, in order to analyse the spatiotemporal dynamics of the initiation, progression, cessation and regression of fibro-contractive diseases in relation to normal healing. This model accounts for fibroblastic cell migration, proliferation and death and growth-factor diffusion, production by cells and tissue removal/decay. Explicit results are obtained in terms of the model processes and parameters. The rate of cellular production of the chemical is shown to be critical to the development of a stable pathological state. Further, cessation and/or regression of the disease depend on appropriate spatiotemporally varying forms for this production rate, which can be understood in terms of the bistability of the normal dermal and pathological steady states—a central property of the model, which is evident from stability and bifurcation analyses. The work predicts novel, biologically realistic and testable pathogenic and control mechanisms, the understanding of which will lead toward more effective strategies for clinical therapy of fibro-proliferative disorders

Random field sampling for a simplified model of melt-blowing considering turbulent velocity fluctuations

In melt-blowing very thin liquid fiber jets are spun due to high-velocity air streams. In literature there is a clear, unsolved discrepancy between the measured and computed jet attenuation. In this paper we will verify numerically that the turbulent velocity fluctuations causing a random aerodynamic drag on the fiber jets -- that has been neglected so far -- are the crucial effect to close this gap. For this purpose, we model the velocity fluctuations as vector Gaussian random fields on top of a k-epsilon turbulence description and develop an efficient sampling procedure. Taking advantage of the special covariance structure the effort of the sampling is linear in the discretization and makes the realization possible