The Effects of Inhomogeneities on Evaluating the Deceleration Parameter q0_0

Analytic expressions for distance-redshift relations which have been corrected for the effects of some inhomogeneities in the Friedmann-Robertson-Walker (FRW) mass density are used to illustrate the significance of inhomogeneities on a determination of $q_0$ made by using Type Ia supernovae. The value of $q_0$ inferred from a given set of observations depends on the fractional amount of matter in inhomogeneities and is up to 50 percent larger than that obtained by using the standard Mattig $m$-$z$ result for pure dust FRW models.Comment: 16 pages, 7 figures in separate uuencoded fil

Analytical designs of a space-borne magnetically-focused klystron amplifier Final report

Design analysis for magnetically focused klystron of satellite television transmission syste

Strategic Review of Tropical Fisheries Management

This project addresses the constraints to tropical fisheries development with sustainable exploitation through a strategic assessment of tropical fisheries management with the following purposes: (1) To evaluate relevant research methods for the development of assessment models appropriate to the circumstances of tropical coastal fisheries; and (2) To evaluate the utility of existing strategies for the implementation of management advice. The report consists of three substantive chapters. Chapter 2 contains a detailed socio-economic assessment of various instruments and implementation strategies applicable to tropical capture fisheries. In Chapter 3, a detailed assessment of the fisheries for tropical large marine ecosystems has been conducted using a technique developed by FAO (Granger & Garcia 1996). The data used were the FAO statistics published regularly by FAO. This analysis has been conducted for each of the tropical large marine ecosystems and indicates that there is the potential for increased fishing in a number of these ecosystems. One of the clear requirements identified in Chapter 2 and implicit in Chapter 3, is that there is a significant need for simple and robust fisheries assessment methods which can estimate the potential of a particular resource, its capacity in terms of the level of fishing effort and its current status ie whether it is currently exploited sustainably or not. In Chapter 4, these problems are addressed directly and, using two approaches, significant simplification of fishery methods is developed. In the first approach, simple empirical relationships between the life history parameters of a species are used to develop models of potential yield which can be determined by a simple assessment of fish growth. In the second approach, optimal life history theory is applied to the key demographic parameters of exploited fish populations and using estimates of the Beverton & Holt invariants a significant simplifying of the basic stock assessment equations is developed

A study of ignition phenomena of bulk metals by radiant heating

Early research on combustion of metals was motivated by the knowledge of the large heat release and corresponding high temperatures associated with metal-oxygen reactions. The advent of space flight brought about an increased interest in the ignition and combustion of metallic particles as additives in solid rocket propellants. More recently, attention has been given to the flammability properties of bulk, structural metals due to the number of accidental explosions of metal components in high-pressure oxygen systems. The following work represents a preliminary study that is part of a broader research effort aimed at providing further insight into the phenomena of bulk metal combustion by looking at the effects of gravity on the ignition behavior of metals. The scope of this preliminary experimental study includes the use of a non-coherent, continuous radiation ignition source, the measurement of temperature profiles of a variety of metals and a qualitative observation of the ignition phenomena at normal gravity. The specific objectives of the investigation include: (1) a feasibility study of the use of a continuous radiation source for metal ignition; (2) testing and characterization of the ignition behavior of a variety of metals; and (3) building a preliminary experimental database on ignition of metals under normal gravity conditions

Supernova Resonance--scattering Line Profiles in the Absence of a Photosphere

In supernova spectroscopy relatively little attention has been given to the properties of optically thick spectral lines in epochs following the photosphere's recession. Most treatments and analyses of post-photospheric optical spectra of supernovae assume that forbidden-line emission comprises most if not all spectral features. However, evidence exists which suggests that some spectra exhibit line profiles formed via optically thick resonance-scattering even months or years after the supernova explosion. To explore this possibility we present a geometrical approach to supernova spectrum formation based on the "Elementary Supernova" model, wherein we investigate the characteristics of resonance-scattering in optically thick lines while replacing the photosphere with a transparent central core emitting non-blackbody continuum radiation, akin to the optical continuum provided by decaying 56Co formed during the explosion. We develop the mathematical framework necessary for solving the radiative transfer equation under these conditions, and calculate spectra for both isolated and blended lines. Our comparisons with analogous results from the Elementary Supernova code SYNOW reveal several marked differences in line formation. Most notably, resonance lines in these conditions form P Cygni-like profiles, but the emission peaks and absorption troughs shift redward and blueward, respectively, from the line's rest wavelength by a significant amount, despite the spherically symmetric distribution of the line optical depth in the ejecta. These properties and others that we find in this work could lead to misidentification of lines or misattribution of properties of line-forming material at post-photospheric times in supernova optical spectra.Comment: 37 pages, 24 figures; accepted for publication in ApJ Supplement Serie

Training interprofessional faculty in humanism and professionalism: a qualitative analysis of what is most important

Introduction: The capacity of healthcare professionals to work collaboratively influences faculty and trainees’ professional identity formation, well-being, and care quality. Part of a multi-institutional project*, we created the Faculty Fellowship for Leaders in Humanistic Interprofessional Education at Boston Children’s Hospital/ Harvard Medical School. We aimed to foster trusting relationships, reflective abilities, collaboration skills, and work together to promote humanistic values within learning environments. Objective: To examine the impact of the faculty fellowship from participants’ reports of “the most important thing learned”. Methods: We studied participants’ reflections after each of 16 1½ hour fellowship sessions. Curriculum content included: highly functioning teams, advanced team formation, diversity/inclusion, values, wellbeing/renewal/burnout, appreciative inquiry, narrative reflection, and others. Responses to “What was the most important thing you learned?” were analyzed qualitatively using a positivistic deductive approach. Results: Participants completed 136 reflections over 16 sessions–77% response rate (136/176). Cohort was 91% female; mean age 52.6 (range 32-65); mean years since completion of highest degree 21.4; 64% held doctorates, 36% master’s degrees. 46% were physicians, 27% nurses, 18% social workers, 9% psychologists. 27% participated previously in a learning experience focusing on interprofessional education, collaboration or practice. Most important learning included: Relational capacities/ Use of self in relationships 96/131 (73%); Attention to values 46/131 (35%); Reflection/ Self-awareness 44/131 (34%); Fostering humanistic learning environments 21/131 (16%). Discussion: Results revealed the importance of enhancing relational capacities and use of self in relationships including handling emotions; attention to values; reflection/self-awareness and recognition of assumptions; and fostering humanistic learning environments. These topics should receive more emphasis in interprofessional faculty development programs and may help identify teaching priorities. *Supported in part by a multi-institutional grant from the Josiah Macy, Jr. Foundation (Dr. Branch as PI; Dr. Rider as site PI)

Shifting Organizational Cultures: Developing Leaders in Humanistic Interprofessional Education

Organizational cultures significantly influence faculty and clinician well-being, trainees’ professional identity formation, and the care of patients and families. The ability of interprofessional healthcare teams to work collaboratively is important for safe, high quality, relationship-centered care. A multi-site project, Faculty Development for the Interprofessional Teaching of Humanism,* was initiated to create a national curriculum in humanism and professionalism designed to train interprofessional education (IPE) faculty leaders. Boston Children’s Hospital / Harvard Medical School (BCH/HMS) is the first pediatric site selected to design and implement this curriculum. Our objectives were to: 1) develop a national curriculum in humanism and professionalism for IPE faculty leaders; 2) adapt the curriculum for pediatrics; and 3) create and sustain a faculty fellowship for IPE leaders at BCH/HMS that promotes humanistic values in organizational culture and learning and care environments. We designed and implemented the curriculum at nine national sites. Topics focus on collaboration, communication, and relationships and include: highly functioning teams; advanced team formation; patients’ perspectives; empathy; well-being, resilience, renewal; diversity & inclusion; appreciative inquiry; values; IPE and others. To achieve sustainability at BCH/HMS, we created a unique Faculty Fellowship for Leaders in Humanistic Interprofessional Education. To increase impact, we recruited co-sponsors from departments across BCH. Fellows participate in 1½-hour, twice-monthly small-group sessions for 8 months and design and implement a group project. Twenty-one faculty applied. The first cohort included 11 faculty representing medicine, social work, nursing, and psychology. The Faculty Fellowship provides opportunities for IPE faculty leaders to enhance teaching skills, collaboration, relationships, reflective capacities, and role modeling in humanism and professionalism, and to work together to foster humanistic values within organizational culture. *Supported by a multi-institutional grant from the Josiah Macy, Jr. Foundation (Dr. Branch as national PI; Dr. Rider as site PI)