Non-universal behavior for aperiodic interactions within a mean-field approximation

We study the spin-1/2 Ising model on a Bethe lattice in the mean-field limit, with the interaction constants following two deterministic aperiodic sequences: Fibonacci or period-doubling ones. New algorithms of sequence generation were implemented, which were fundamental in obtaining long sequences and, therefore, precise results. We calculate the exact critical temperature for both sequences, as well as the critical exponent $\beta$, $\gamma$ and $\delta$. For the Fibonacci sequence, the exponents are classical, while for the period-doubling one they depend on the ratio between the two exchange constants. The usual relations between critical exponents are satisfied, within error bars, for the period-doubling sequence. Therefore, we show that mean-field-like procedures may lead to nonclassical critical exponents.Comment: 6 pages, 7 figures, to be published in Phys. Rev.

Check-mate: Automatic constraint checking of IFC models

Building Information Models (BIMs) allow for computationally checking whether a building design satisfies all the building codes, requirements, etc. if constraints are included in the model. One application for this is mass customization in the housing sector, when clients modify the design without help from the architect. This paper describes the technical aspects of checking constraints on a building model. Specifically, we look at the feasibility of checking constraints on an IFC model by creating a prototype in which constraints can be entered and checked on an imported IFC model. Conclusions are drawn on the suitability of the IFC model and how IFC can be extended or adjusted to support constraint checking

Designing with constraints - Towards mass customization in the housing industry

Mass customization, while common in other industries, has yet to find widespread adoption in the housing industry. Current methods of mass customization are either labour-intensive or allow only a limited degree of freedom. In this paper, we look at a method of mass customization that allows buyers to make modifications to the design of their house, after which the new design is automatically checked against building regulations and the architect’s requirements

High temperature thermal conductivity of 2-leg spin-1/2 ladders

Based on numerical simulations, a study of the high temperature, finite frequency, thermal conductivity $\kappa(\omega)$ of spin-1/2 ladders is presented. The exact diagonalization and a novel Lanczos technique are employed.The conductivity spectra, analyzed as a function of rung coupling, point to a non-diverging $dc-$limit but to an unconventional low frequency behavior. The results are discussed with perspective recent experiments indicating a significant magnetic contribution to the energy transport in quasi-one dimensional compounds.Comment: 4 pages, 4 figure

An instrument for dimensional diagnosis of a child’s constitution (ICC)

Developmental disorders present themselves with complex problems that may threaten a child’s development. In every child a disorder shows itself in a unique way, which makes it necessary to individualize. The objective of this preliminary study is to develop an instrument that provides a dimensional diagnosis by mapping the degree of (dis)balance in three domains of child development. The instrument is based on anthroposophic anthropology and typology. The instrument will be usable in all kinds of care for children with developmental disorders.The typology of a child’s constitution was operationalized using concept mapping and consensus building with experts. Preliminary tests of the psychometric properties of the instrument were applied on children with developmental disorders in a pilot study in Dutch healthcare. The Instrument for diagnosis of a Child’s Constitution (ICC) developed in this study consists of two parts. Part I contains 36 polar formulated items in three subscales of 12 items and is to be completed by healthcare professionals. Part II consists of three VAS scales (Visual analogue scales) and is to be completed y a practitioner. The outcome (the scores of Part I and II) forms a profile of the child’s constitution, showing the (dis) balance in three domains of child development. A pilot study with 38 children shows positive face validity, and moderate internal consistency and inter-rater reliability of the ICC. The ICC has been developed as a diagnostic instrument to assess individualized dimensional diagnosis of children with a developmental disorder. Future studies will focus on validation of the instrument

A comparison between rate-and-state friction and microphysical models, based on numerical simulations of fault slip

Rate-and-state friction (RSF) is commonly used for the characterisation of laboratory friction experiments, such as velocity-step tests. However, the RSF framework provides little physical basis for the extrapolation of these results to the scales and conditions of natural fault systems, and so open questions remain regarding the applicability of the experimentally obtained RSF parameters for predicting seismic cycle transients. As an alternative to classical RSF, microphysics-based models offer means for interpreting laboratory and field observations, but are generally over-simplified with respect to heterogeneous natural systems. In order to bridge the temporal and spatial gap between the laboratory and nature, we have implemented existing microphysical model formulations into an earthquake cycle simulator. Through this numerical framework, we make a direct comparison between simulations exhibiting RSF-controlled fault rheology, and simulations in which the fault rheology is dictated by the microphysical model. Even though the input parameters for the RSF simulation are directly derived from the microphysical model, the microphysics-based simulations produce significantly smaller seismic event sizes than the RSF-based simulation, and suggest a more stable fault slip behaviour. Our results reveal fundamental limitations in using classical rate-and-state friction for the extrapolation of laboratory results. The microphysics-based approach offers a more complete framework in this respect, and may be used for a more detailed study of the seismic cycle in relation to material properties and fault zone pressure-temperature conditions

The ideal application of surveillance technology in residential care for people with dementia

As our society is ageing, nursing homes are finding it increasingly difficult to deal with an expanding population of patients with dementia and a decreasing workforce. A potential answer to this problem might lie in the use of technology. However, the use and application of surveillance technology in dementia care has led to considerable ethical debate among healthcare professionals and ethicists, with no clear consensus to date. To explore how surveillance technology is viewed by care professionals and ethicists working in the field, by investigating the ideal application of surveillance technology in the residential care of people with dementia. Use was made of the concept mapping method, a computer-assisted procedure consisting of five steps: brainstorming, prioritizing, clustering, processing by the computer and analysis. Various participants (ranging from ethicists to physicians and nurses) were invited on the basis of their professional background. The views generated are grouped into six categories ranging from the need for a right balance between freedom and security, to be beneficial and tailored to the resident, and clearly defined procedures to competent and caring personnel, active monitoring and clear normative guidance. The results are presented in the form of a graphic chart. There appears to be an inherent duality in the views on using surveillance technology which is rooted in the moral conflict between safety and freedom. Elaboration of this ethical issue has proved to be very difficul

Psychedelic Treatments for Psychiatric Disorders:A Systematic Review and Thematic Synthesis of Patient Experiences in Qualitative Studies

Introduction Interest in the use of psychedelic substances for the treatment of mental disorders is increasing. Processes that may affect therapeutic change are not yet fully understood. Qualitative research methods are increasingly used to examine patient accounts; however, currently, no systematic review exists that synthesizes these findings in relation to the use of psychedelics for the treatment of mental disorders. Objective To provide an overview of salient themes in patient experiences of psychedelic treatments for mental disorders, presenting both common and diverging elements in patients' accounts, and elucidating how these affect the treatment process. Methods We systematically searched the PubMed, MEDLINE, PsycINFO, and Embase databases for English-language qualitative literature without time limitations. Inclusion criteria were qualitative research design; peer-reviewed studies; based on verbalized patient utterances; and a level of abstraction or analysis of the results. Thematic synthesis was used to analyze and synthesize results across studies. A critical appraisal of study quality and methodological rigor was conducted using the Critical Appraisal Skills Programme (CASP). Results Fifteen research articles, comprising 178 patient experiences, were included. Studies exhibited a broad heterogeneity in terms of substance, mental disorder, treatment context, and qualitative methodology. Substances included psilocybin, lysergic acid diethylamide (LSD), ibogaine, ayahuasca, ketamine and 3,4-methylenedioxymethamphetamine (MDMA). Disorders included anxiety, depression, eating disorders, post-traumatic stress disorder, and substance use disorders. While the included compounds were heterogeneous in pharmacology and treatment contexts, patients reported largely comparable experiences across disorders, which included phenomenological analogous effects, perspectives on the intervention, therapeutic processes and treatment outcomes. Comparable therapeutic processes included insights, altered self-perception, increased connectedness, transcendental experiences, and an expanded emotional spectrum, which patients reported contributed to clinically and personally relevant responses. Conclusions This review demonstrates how qualitative research of psychedelic treatments can contribute to distinguishing specific features of specific substances, and carry otherwise undiscovered implications for the treatment of specific psychiatric disorders