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Priscilla J Hall, Jennifer Whitman Foster, Kathryn M Yount, Bonnie Mowinski Jennings
OBJECTIVE: To explore the complexity of women's birth experiences in the context in which they occur and to describe how these influence women's well-being in labor. DESIGN: Qualitative method with a phenomenological approach, following the analysis principles of van Manen. PARTICIPANTS AND SETTING: Eight women from different ethnic and socioeconomic backgrounds in Atlanta, Georgia, United States with a recent, healthy birth were interviewed twice about their experience of the labor journey...
December 14, 2017: Midwifery
V R Ahuja, J van der Gucht, W J Briels
We present a novel coarse-grain particle-based simulation technique for modeling self-developing flow of dilute and semi-dilute polymer solutions. The central idea in this paper is the two-way coupling between a mesoscopic polymer model and a phenomenological fluid model. As our polymer model, we choose Responsive Particle Dynamics (RaPiD), a Brownian dynamics method, which formulates the so-called "conservative" and "transient" pair-potentials through which the polymers interact besides experiencing random forces in accordance with the fluctuation dissipation theorem...
January 21, 2018: Journal of Chemical Physics
Vigdis Bruun-Olsen, Astrid Bergland, Kristi Elisabeth Heiberg
BACKGROUND: Recovery outlooks of physical functioning and quality of life after hip fracture have not changed significantly over the past 25 years. Previous research has mainly dealt with causalities and acute treatment, while the recovery process from the patients' perspective has been less comprehensively described. Expanded knowledge of what the patients consider important in their recovery process may have important consequences for how these patients are treated in the future and thereby on future patient outcomes...
January 19, 2018: BMC Geriatrics
Katrin Schroeder, Anja Schätzle, Pauline Kowohl, Lisa Leske, Christian G Huber, Ingo Schäfer
BACKGROUND: Psychotic-like symptoms are found in a subgroup of borderline patients (BPD). Reported prevalence is heterogeneous (up to 50% affected). Investigations in Germany have not been conducted so far. Furthermore, the precise phenomenology of the psychotic symptoms and the effects on suicidal behavior and the use of inpatient psychiatric treatment are unclear. OBJECTIVES: The aim of the study was to investigate prevalence rates and phenomenology of psychotic-like symptoms...
January 19, 2018: Psychotherapie, Psychosomatik, Medizinische Psychologie
Morna J Liddle, Sarah R Baker, Keith G Smith, Andrew R Thompson
OBJECTIVE: To gain an experiential account of the processes of change associated specifically with orthognathic surgery. DESIGN: A qualitative design was used. Semistructured interviews were carried out with 7 participants approximately 1 week before and 6-8 weeks after surgery. The data were analyzed using interpretative phenomenologic analysis (IPA). SETTING: Participants were recruited from a NHS Dental Hospital. PARTICIPANTS: Patients aged 16 to 25 years scheduled to undergo orthognathic surgery on both the upper and lower jaws were purposively sought to participate...
February 2018: Cleft Palate-craniofacial Journal
Janni Lisander Larsen, Elisabeth O C Hall, Søren Jacobsen, Regner Birkelund
AIM: To explore, from the perspective of women the nature of basic existential conditions while living with systemic lupus erythematosus. BACKGROUND: Systemic lupus erythematosus has an unpredictable disease course and is documented to cause an existential rearrangement of life. The significance of changes in existential conditions and related experiences are unclear in the context of nursing and women with systemic lupus erythematosus. DESIGN: A qualitative design guided by Van Manen's hermeneutic phenomenological methodology...
January 19, 2018: Journal of Advanced Nursing
Holly C Standing, Catherine Exley, Guy A MacGowan, Tim Rapley
BACKGROUND: Ventricular assist devices (VADs) are a relatively new development in the management of advanced heart failure. In the UK, VAD recipients comprise a unique group of less than 200 patients. This is the first paper to explore the experience of VAD communities, the extent to which communities are developed around the device, and how these influence the experience of living with the VAD. METHODS: Qualitative interviews were conducted with 20 VAD recipients (implanted as a bridge to transplantation), 11 interviews also included the VAD recipients' partners...
January 1, 2018: European Journal of Cardiovascular Nursing
Matthew Piva, Steve W C Chang
Interest in the effects of oxytocin on social behavior has persisted even as an overarching theory describing these effects has remained largely elusive. Some of the earliest studies on the effects of oxytocin on social decision-making indicated that oxytocin might enhance prosocial actions directed toward others. This led to development of the prosocial hypothesis, which stipulates that oxytocin specifically enhances prosocial choices. However, further work indicated that oxytocin administration could elicit antisocial behaviors as well in certain social situations, highlighting the importance of context-dependent effects...
January 19, 2018: American Journal of Primatology
Lucette Lanyon, Linda Worrall, Miranda Rose
BACKGROUND: Participation in a group environment is an inherently complex undertaking for people with aphasia. It involves engaging in multi-person interactions with other people who may have a range of communication strengths and strategies at their disposal. The potential challenges of community aphasia-group participation and practice has had limited attention in the research literature. Evidence from group users have primarily been drawn from the perspective of long-term members or those participating in highly specific and time-bound groups...
January 19, 2018: International Journal of Language & Communication Disorders
Sathiya Mahakrishnan, Subrata Chakraborty, Amrendra Vijay
Emergent statistical attributes, and therefore the equations of state, of an assembly of interacting charge carriers embedded within a complex molecular environment frequently exhibit a variety of anomalies, particularly in the high-density (equivalently, the concentration) regime, which are not well understood, because they do not fall under the low-concentration phenomenologies of Debye-Hückel-Onsager and Poisson-Nernst-Planck, including their variants. To go beyond, we here use physical concepts and mathematical tools from quantum scattering theory, transport theory with the Stosszahlansatz of Boltzmann, and classical electrodynamics (Lorentz gauge) and obtain analytical expressions both for the average and the frequency-wave vector-dependent longitudinal and transverse current densities, diffusion coefficient, and the charge density, and therefore the analytical expressions for (a) the chemical potential, activity coefficient, and the equivalent conductivity for strong electrolytes and (b) the current-voltage characteristics for ion-transport processes in complex molecular environments...
November 2017: Physical Review. E
Filippo Palombi, Stefano Ferriani, Simona Toti
We investigate large-scale effects induced by external fields, phenomenologically interpreted as mass media, in multiagent models evolving with the microscopic dynamics of the binary naming game. In particular, we show that a single external field, broadcasting information at regular time intervals, can reverse the majority opinion of the population, provided the frequency and the effectiveness of the sent messages lie above well-defined thresholds. We study the phase structure of the model in the mean field approximation and in numerical simulations with several network topologies...
December 2017: Physical Review. E
Raunak Sakhardande, Stefan Stanojeviea, Arvind Baskaran, Aparna Baskaran, Michael F Hagan, Bulbul Chakraborty
We present a Ginzburg-Landau theory of microphase separation in a bidisperse chiral membrane consisting of rods of opposite handedness. This model system undergoes a phase transition from an equilibrium state where the two components are completely phase separated to a state composed of microdomains of a finite size comparable to the twist penetration depth. Characterizing the phenomenology using linear stability analysis and numerical studies, we trace the origin of the discontinuous change in microdomain size that occurs during this phase transition to a competition between the cost of creating an interface and the gain in twist energy for small microdomains in which the twist penetrates deep into the center of the domain...
July 2017: Physical Review. E
Honghui Wang, Jizhou He, Jianhui Wang
We analyze general models of quantum heat engines operating a cycle of two adiabatic and two isothermal processes. We use the quantum master equation for a system to describe heat transfer current during a thermodynamic process in contact with a heat reservoir, with no use of phenomenological thermal conduction. We apply the endoreversibility description to such engine models working in the linear response regime and derive expressions of the efficiency and the power. By analyzing the entropy production rate along a single cycle, we identify the thermodynamic flux and force that a linear relation connects...
July 2017: Physical Review. E
Chengliang Lin, Gerd Röpke, Wolf-Dietrich Kraeft, Heidi Reinholz
The properties of a bound electron system immersed in a plasma environment are strongly modified by the surrounding plasma. The modification of an essential quantity, the ionization energy, is described by the electronic and ionic self-energies, including dynamical screening within the framework of the quantum statistical theory. Introducing the ionic dynamical structure factor as the indicator for the ionic microfield, we demonstrate that ionic correlations and fluctuations play a critical role in determining the ionization potential depression...
July 2017: Physical Review. E
B Houchmandzadeh, M Vallade
The propagation of a beneficial mutation in a spatially extended population is usually studied using the phenomenological stochastic Fisher-Kolmogorov-Petrovsky-Piscounov (SFKPP) equation. We derive here an individual-based, stochastic model founded on the spatial Moran process where fluctuations are treated exactly. The mean-field approximation of this model leads to an equation that is different from the phenomenological FKPP equation. At small selection pressure, the front behavior can be mapped into a Brownian motion with drift, the properties of which can be derived from the microscopic parameters of the Moran model...
July 2017: Physical Review. E
Zhengyu Feng, A D L Chandani Perera, Atsuo Fukuda, Jagdish K Vij, Ken Ishikawa, Atsuo Iida, Yoichi Takanishi
A mixture of two selenium-containing compounds, 80 wt. % AS657 and 20 wt. % AS620, are studied with two complementary methods, electric-field-induced birefringence (EFIB) and microbeam resonant x-ray scattering (μRXS). The mixture shows the typical phase sequence of Sm-C_{A}^{*}-1/3-1/2-Sm-C^{*}-Sm-C_{α}^{*}-Sm-A, where 1/3 and 1/2 are two prototypal ferrielectric and antiferroelectric subphases with three- and four-layer unit cells, respectively. Here we designate the subphase as its q_{T} number defined by the ratio of [F]/([F]+[A]), where [F] and [A] are the numbers of synclinic ferroelectric and anticlinic antiferroelectric orderings in the unit cell, respectively...
July 2017: Physical Review. E
Guangyuan Yu, Jingchen Feng, Haoran Man, Herbert Levine
Cells exhibit qualitatively different behaviors on substrates with different rigidities. The fact that cells are more polarized on the stiffer substrate motivates us to construct a two-dimensional cell with the distribution of focal adhesions dependent on substrate rigidities. This distribution affects the forces exerted by the cell and thereby determines its motion. Our model reproduces the experimental observation that the persistence time is higher on the stiffer substrate. This stiffness-dependent persistence will lead to durotaxis, the preference in moving towards stiffer substrates...
July 2017: Physical Review. E
Shu-Nan Li, Bing-Yang Cao
The second law of thermodynamics governs the direction of heat transport, which provides the foundational definition of thermodynamic Clausius entropy. The definitions of entropy are further generalized for the phenomenological heat transport models in the frameworks of classical irreversible thermodynamics and extended irreversible thermodynamics (EIT). In this work, entropic functions from mathematics are combined with phenomenological heat conduction models and connected to several information-geometrical conceptions...
September 2017: Physical Review. E
Munekazu Ohno, Tomohiro Takaki, Yasushi Shibuta
A variational formulation of a quantitative phase-field model is presented for nonisothermal solidification in a multicomponent alloy with two-sided asymmetric diffusion. The essential ingredient of this formulation is that the diffusion fluxes for conserved variables in both the liquid and solid are separately derived from functional derivatives of the total entropy and then these fluxes are related to each other on the basis of the local equilibrium conditions. In the present formulation, the cross-coupling terms between the phase-field and conserved variables naturally arise in the phase-field equation and diffusion equations, one of which corresponds to the antitrapping current, the phenomenological correction term in early nonvariational models...
September 2017: Physical Review. E
Dylan Brennan, Aleksandra A Zecevic, Shannon L Sibbald, Volker Nolte
OBJECTIVES: The risk of falling increases in adults over the age of 65. A common barrier to take up physical activity in sedentary older adults is the fear of falls and injury. Experiences of masters athletes can provide insights into management of the risk for falling. The purpose of this phenomenological study was to explore the fall-risk experience of masters athletes actively competing in sport. METHODS: Masters athletes over the age of 55 (n=22) described their experiences in semi-structured interviews...
January 18, 2018: Journal of Aging and Physical Activity
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