Testing Odd Direct Sums Using High Dimensional Expanders

In this work, using methods from high dimensional expansion, we show that the property of k-direct-sum is testable for odd values of k . Previous work of [Kaufman and Lubotzky, 2014] could inherently deal only with the case that k is even, using a reduction to linearity testing. Interestingly, our work is the first to combine the topological notion of high dimensional expansion (called co-systolic expansion) with the combinatorial/spectral notion of high dimensional expansion (called colorful expansion) to obtain the result. The classical k-direct-sum problem applies to the complete complex; Namely it considers a function defined over all k-subsets of some n sized universe. Our result here applies to any collection of k-subsets of an n-universe, assuming this collection of subsets forms a high dimensional expander

Dynamics of end-linked star polymer structures

In this work we focus on the dynamics of macromolecular networks formed by end-linking identical polymer stars. The resulting macromolecular network can then be viewed as consisting of spacers which connect branching points (the cores of the stars). We succeed in analyzing exactly, in the framework of the generalized Gaussian model, the eigenvalue spectrum of such networks. As applications we focus on several topologies, such as regular networks and dendrimers; furthermore, we compare the results to those found for regular hyperbranched structures. In so doing, we also consider situations in which the beads of the cores differ from the beads of the spacers. The analytical procedure which we use involves an exact real-space renormalization, which allows to relate the star-network to a (much simpler) network, in which each star is reduced to its core. It turns out that the eigenvalue spectrum of the star-polymer structure consists of two parts: One follows in terms of polynomial equations from the relaxation spectrum of the corresponding renormalized structure, while the second part involves the motion of the spacer chains themselves. Finally, we show exemplarily the situation for copolymeric dendrimers, calculate their spectra, and from them their storage and the loss moduli.Comment: 15 pages, 11 eps-figures include

Medicina narrativa enfocada a la investigación empírica social: el contexto ruso

Este artículo presenta los resultados de un análisis empírico llevado a cabo entre 2012 y 2016, que buscó entender si las narrativas de los pacientes están presentes en la comunicación médico-paciente y si esta historia subjetiva es significativa para ambos lados de la comunicación médica en la medicina somática rusa. La investigación se realizó en cuatro etapas y combinó métodos cualitativos y cuantitativos, analizando las perspectivas de pacientes, médicos y estudiantes de medicina a través de encuestas y entrevistas e indagando además en la comunicación médico-paciente en foros virtuales. En las cuatro etapas, los resultados de la investigación mostraron que se otorga poco valor a la experiencia subjetiva de la enfermedad en las interacciones entre médicos y pacientes. El tema de la medicina narrativa es inexplorado en los estudios sociales rusos, por lo que los resultados de esta investigación constituyen una contribución importante en pos de establecer la medicina narrativa como una idea global que promueve el valor universal en términos terapéuticos y éticos de las historias de enfermedad en la “sociedad de remisión”, en el cual dominan las patologías crónicas.This article contains the results of the empirical analysis carried out in 2012- 2016 which sought to examine whether patients’ narratives of their illness were present in doctor-patient communication and whether this subjective story was significant to both sides of the medical communication in Russian somatic disease medicine. The research was carried out in four stages and combined qualitative and quantitative methods, analyzing the perspectives of patients, doctors and medical students through surveys and interviews as well as looking at online doctor-patient communication in health forums. In all four stages, the results of the research showed that little value was placed on the subjective experience of disease in doctor-patient interactions. The topic of narrative medicine is new to Russian social studies, making the results of this research an important contribution to the establishment of narrative medicine as a global idea advocating the universal therapeutic and ethical value of patients’ stories of illness in the “remission society,” in which chronic pathologies dominate

Nurse–physician collaboration in general internal medicine : a synthesis of survey and ethnographic techniques

BACKGROUND Effective collaboration between hospital nurses and physicians is associated with patient safety, quality of care, and provider satisfaction. Mutual nurse–physician perceptions of one another’s collaboration are typically discrepant. Quantitative and qualitative studies frequently conclude that nurses experience lower satisfaction with nurse–physician collaboration than physicians. Mixed methods studies of nurse–physician collaboration are uncommon; results from one of the two approaches are seldom related to or reported in terms of the others. This paper aims to demonstrate the complementarity of quantitative and qualitative methods for understanding nurse–physician collaboration. METHODS In medicine wards of 5 hospitals, we surveyed nurses and physicians measuring three facets of collaboration— communication, accommodation, and isolation. In parallel we used shadowing and interviews to explore the quality of nurse–physician collaboration. Data were collected between June 2008 and June 2009. RESULTS The results indicated difference of nurse–physician ratings of one another’s communication was small and not statistically significant; communication timing and skill were reportedly challenging. Nurses perceived physicians as less accommodating than physicians perceived nurses (P\u3c.01) and the effect size was medium. Physicians’ independent schedules were problematic for nurses. Nurses felt more isolated from physicians than physicians from nurses (P\u3c.0001) and the difference was large in standardized units. Hierarchical relationships were related to nurses’ isolation; however this could be moderated by leadership support. CONCLUSION Our mixed-method approach indicates that longstanding maladaptive nurse–physician relationships persist in the inpatient setting, but not uniformly. Communication quality seems mutually acceptable, while accommodation and isolation are more problematic among nurses

Cardiovascular and Affective Recovery from Anticipatory Threat

Anticipating a stressor elicits robust cardiovascular and affective responses. Despite the possibility that recovery from these responses may have implications for physical and mental well-being, little research has examined this issue. In this study, participants either gave a public speech or anticipated giving a speech. Compared with speech-givers, participants who anticipated giving a speech, on average, exhibited similar cardiovascular recovery (decreased heart rate [HR] and increased respiratory sinus arrhythmia [RSA]), and reported lower negative affect during recovery. Only in the anticipation condition, however, were cardiovascular recovery and affective recovery associated: poor affective recovery predicted incomplete HR recovery and decreased RSA. These are the first data to compare explicitly recovery from anticipation of a stressor with recovery from the stressor itself. These findings suggest that failing to recover from anticipation has unique physiological costs that, in turn, may contribute to mental and physical illness.Psycholog

Frequency Dispersion of Sound Propagation in Rouse Polymer Melts via Generalized Dynamic Random Phase Approximation

An extended generalization of the dynamic random phase approximation (DRPA) for L-component polymer systems is presented. Unlike the original version of the DRPA, which relates the (LxL) matrices of the collective density-density time correlation fumctions and the corresponding susceptibilities of polymer concentrated systems to those of the tracer macromolecules and so-called broken links system (BLS), our generalized DRPA solves this problem for (5xL)x(5xL) matrices of the coupled susceptibilities and time correlation functions of the component number, kinetic energy and flux densities. The presented technique is used to study propagation of sound and dynamic form-factor in disentangled (Rouse) monodisperse homopolymer melt. The calculated sound velocity and absorption coefficient reveal substantial frequency dispersion. The relaxation time is found to be N times less than the Rouse time (N is the degree of polymerization), which evidences strong dynamic screening because of interchain interaction. We discuss also some peculiarities of the Brillouin scattering in polymer melts. Besides, a new convenient expression for the dynamic structural function of the Rouse chain in (q,p)-representation is found.Comment: 37 pages, 2 appendices, 48 references, 1 figur

Validation of polish version of the Basel extent of rationing of nursing care revised questionnaire

Development of simple, valid and reliable instruments to determine nursing care rationing is a subject of ongoing research. One such instrument, which is gaining popularity worldwide and has significant research applicability, is the Basel Extent of Rationing of Nursing Care (BERNCA) and its revised version, the BERNCA-R. The aim of this study was to translate and adapt the BERNCA-R into a Polish-language version and to assess its reliability and validity in evaluating the level of implicit rationing of nursing care in Poland. Standard methodological requirements were followed during translation and cultural adaptation of the English version of the BERNCA-R questionnaire into Polish. The cross-sectional validation study was conducted between May and September 2017, which included 175 nurses undergoing specialisation and qualification courses at the European Postgraduate Education Centre in Wrocław, Poland. Cronbach’s alpha and inter-item correlations were used to analyse the internal consistency of the Polish BERNCA-R questionnaire. The mean total BERNCA-R score was 1.9 points (SD = 0.74) on a scale of 0-4. Cronbach’s alpha for the unidimensional scale was 0.96. The mean inter-item correlation was 0.4 (range 0.1-0.84), which indicates high internal consistency. A single-factor solution demonstrated stable loadings above 0.5 for almost all items of the Polish BERNCA-R questionnaire. The study using the Polish BERNCA-R questionnaire demonstrated that the instrument is valid and reliable for use in investigating care rationing in groups of Polish nurses