Dynamic magnetic response of infinite arrays of ferromagnetic particles

Recently developed techniques to find the eigenmodes of a ferromagnetic particle of arbitrary shape, as well as the absorption in the presence of an inhomogeneous radio-frequency field, are extended to treat infinite lattices of such particles. The method is applied to analyze the results of recent FMR experiments, and yields substantially good agreement between theory and experiment

Research with bereaved families

Theoretical debates about the nature of grief and bereavement draw attention to the sensitivity of carrying out research with bereaved people, the possible threats that this may pose and the ethical considerations required to ameliorate potentially damaging outcomes. The authors of this article present a framework for ethical decision-making that has been successfully developed in the context of research with bereaved families. The discussion focuses on application and evaluation of the framework during research with family members who were approached about the donation of a deceased relative’s organs and/or tissues for transplantation. Practical strategies of relevance to the processes of participant recruitment, the interview encounter and follow-up care in the post-interview period are identified and discussed. Concerns about the possible impact of bereavement research are balanced with the views of family members who gave credence to the therapeutic and cathartic benefits of participating in sensitive, death-related research. </jats:p

Childhood traumatic infarction causing left ventricular aneurysm: Diagnosis by two-dimensional echocardiography

After being struck by an automobile, a 9 year old boy developed transient right bundle branch block followed by electrocardiographic changes of inferior wall myocardial infarction and an increase of serum cardiac enzymes. Two-dimensional echocardiography demonstrated a prominent septal aneurysm. Subsequent cardiac catheterization confirmed septal aneurysm and demon- strated an additional inferior aneurysm. Six weeks after the accident, resection of the inferior aneurysm was performed. At 1 year follow-up study, residual septal aneurysm and cardiomegaly are present, but the boy is asymptomatic

Nuclear structure of 178Hf related to the spin-16, 31-year isomer

The projected shell model is used to study the multi-quasiparticle and collective excitations of 178Hf. With an axially symmetric basis, the spin-16 isomer at 2.4 MeV appears to be well separated in energy/spin space from other configurations. However, projected energy surface calculations suggest that 178Hf has significant softness to axially asymmetric shapes, which can strongly modify the level distribution. The implications for photodeexitation of the isomer are discussed.Comment: 8 pages, 4 figure

Hartford Hub: Transforming Lower Lincoln

Breeah S. Carey received her degree in speech, language, and hearing sciences with minors in Spanish and psychology from Purdue University in May 2018. She is currently pursuing her master’s degree in speech-language pathology at Purdue University and wants to serve pediatric clients in school and clinic settings. She has volunteered in various schools in Newark, New Jersey, as a tutor in her mother’s after-school program and as a speaker for the Diamond’s in the Rough Program at Belmont Runyon Elementary School, where she encouraged minority girls to attend college in the future. Lauren Jankowski is a senior in interdisciplinary engineering who plans to pursue graduate school and focus her research on mental illness. She has volunteered with several organizations, such as St. Vincent de Paul, Hannah’s House, and Upward Basketball, since early high school. Madison Long received her degree in accounting from Purdue University in 2017 and began her career with Microsoft Corporation in Seattle, Washington, in their finance division. At Purdue, she frequently participated in local Lafayette community initiatives centered around child literacy and engagement, including United Way’s Read to Succeed Program and the Beck Lane Boys and Girls Club after-school volunteering program. Joshua Walker is a senior in mechanical engineering with a minor in computer science and plans to earn a master’s degree in mechanical engineering after a few years of work experience. He has provided one-on-one assistance with students at the free Math and Science Tutoring Center in his high school, refurbished bicycles intended for community use at Revolutions Bicycle Cooperative in Memphis, Tennessee, and worked with Engineers for a Sustainable World to keep tailgating parties at Purdue clean of trash

Diagonalization of 1-D Differential Operators With Piecewise Constant Coefficients Using the Uncertainty Principle

A highly accurate and efficient numerical method is presented for computing the solution of a 1-D time-dependent partial differential equation in which the spatial differential operator features a piecewise constant coefficient defined on n role= presentation \u3e pieces, in either self-adjoint and non-self-adjoint form, on a finite interval with periodic boundary conditions. The Uncertainty Principle is used to estimate the eigenvalues of the operator. Then, these estimates are used to construct a basis of eigenfunctions for use with a spectral method. The solution is presented as a truncated eigenfunction expansion, where each eigenfunction is a wave function that changes frequencies at the interfaces between different materials. Numerical experiments demonstrate the accuracy, efficiency and scalability of the method in comparison to other methods

How do people with chronic low back pain perceive specific and general exercise? A mixed methods survey

Purpose: Exercise prescriptions for chronic low back pain (CLBP) often utilize reductionistic, trunk-focused exercise aimed at addressing proposed pain mechanisms. It is unknown if the use of these trunk-focused exercises imply beliefs to people with CLBP about the rationale for their use (e.g., etiology), even without concurrent biomedical narratives. This study aimed to explore people's perceptions of specific and general exercise without an accompanying narrative when experiencing CLBP. Methods: An anonymous online survey was distributed. Mixed methods were utilized for analysis. Six-point Likert scales categorized people's beliefs about individual exercises. Open-ended questions were used to gather further beliefs which were then coded into themes. Results: People with CLBP perceived specific exercise as more beneficial than general exercise. Eight themes and five subthemes were defined. A high volume of positive beliefs were centered around strengthening the low back and abdominal musculature, emphasizing the importance of correct technique. Negative beliefs were held against spinal flexion and external load. Both positive and negative beliefs were underpinned by spinal/pelvic stability being important as well as certain exercises being achievable or not. Conclusion: This study demonstrated that people with CLBP consider specific exercises to be more beneficial than general exercises for CLBP. Specific exercises irrespective of an accompanying narrative can imply meaning about the intent of an exercise. Understanding this requires practitioners to be mindful when prescribing and communicating exercise

Boussinesq/Boussinesq systems for internal waves with a free surface, and the KdV approximation

We study here some asymptotic models for the propagation of internal and surface waves in a two-fluid system. We focus on the so-called long wave regime for one dimensional waves, and consider the case of a flat bottom. Starting from the classical Boussinesq/Boussinesq system, we introduce a new family of equivalent symmetric hyperbolic systems. We study the well-posedness of such systems, and the asymptotic convergence of their solutions towards solutions of the full Euler system. Then, we provide a rigorous justification of the so-called KdV approximation, stating that any bounded solution of the full Euler system can be decomposed into four propagating waves, each of them being well approximated by the solutions of uncoupled Korteweg-de Vries equations. Our method also applies for models with the rigid lid assumption, and the precise behavior of the KdV approximations depending on the depth and density ratios is discussed for both rigid lid and free surface configurations. The fact that we obtain {\it simultaneously} the four KdV equations allows us to study extensively the influence of the rigid lid assumption on the evolution of the interface, and therefore its domain of validity. Finally, solutions of the Boussinesq/Boussinesq systems and the KdV approximation are rigorously compared and numerically computed.Comment: To appear in M2A