Capturing, using, and managing quality assurance knowledge for shuttle post-MECO flight design

Ascent initialization values used by the Shuttle's onboard computer for nominal and abort mission scenarios are verified by a six degrees of freedom computer simulation. The procedure that the Ascent Post Main Engine Cutoff (Post-MECO) group uses to perform quality assurance (QA) of the simulation is time consuming. Also, the QA data, checklists and associated rationale, though known by the group members, is not sufficiently documented, hindering transfer of knowledge and problem resolution. A new QA procedure which retains the current high level of integrity while reducing the time required to perform QA is needed to support the increasing Shuttle flight rate. Documenting the knowledge is also needed to increase its availability for training and problem resolution. To meet these needs, a knowledge capture process, embedded into the group activities, was initiated to verify the existing QA checks, define new ones, and document all rationale. The resulting checks were automated in a conventional software program to achieve the desired standardization, integrity, and time reduction. A prototype electronic knowledge base was developed with Macintosh's HyperCard to serve as a knowledge capture tool and data storage

The effect of differential refraction on wave propagation in rotating pulsar magnetospheres

Refraction of wave propagation in a corotating pulsar magnetospheric plasma is considered as a possible interpretation for observed asymmetric pulse profiles with multiple components. The pulsar radio emission produced inside the magnetosphere propagates outward through the rotating magnetosphere, subject to refraction by the intervening plasma that is spatially inhomogeneous. Both effects of a relativistic distribution of the plasma and rotation on wave propagation are considered. It is shown that refraction coupled with rotation can produce asymmetric conal structures of the profile. The differential refraction due to the rotation can cause the conal structures to skew toward the rotation direction and lead to asymmetry in relative intensities between the leading and trailing components. Both of these features are potentially observable.Comment: 9 pages, 7 figures, accepted for publication in MNRA

The Union and Médecins Sans Frontières approach to operational research.

Operational research (OR) has become a hot topic at national meetings, international conferences and donor fora. The International Union Against Tuberculosis and Lung Disease (The Union) and Médecins Sans Frontières (MSF) Operational Centre Brussels strongly promote and implement OR with colleagues in low- and middle-income countries. Here we describe how the two organisations define OR, and explain the guiding principles and methodology that underpin the strategy for developing and expanding OR in those countries. We articulate The Union's and MSF's approach to supporting OR, highlighting the main synergies and differences. Then, using the Malawi National Tuberculosis Control Programme as an example, we show how OR can be embedded within tuberculosis control activities, leading to changes in policy and practice at the national level. We discuss the difficult, yet vitally important, issue of capacity building, and share our vision of a new paradigm of product-related training and performance-based OR fellowships as two ways of developing the necessary skills at country level to ensure research is actually performed. Finally, we highlight the need to consider and incorporate into practice the ethical components of OR. This is a key moment to be involved in OR. We are confident that in partnership with interested stakeholders, including the World Health Organization, we can stimulate the implementation of quality, relevant OR as an integral part of health service delivery that in turn will lead to better health for people, particularly for those living in the poorer parts of the world

Defect modes in otherwise perfect photonic crystal and photonic crystal fibres

Many of the applications of photonic crystals and photonic crystal fibres require the periodic structure tohave some type of defect. In photonic crystal fibers a point defect defines the fiber core, whereas in photonic crystals a line defect acts as a waveguide, and point defects act as cavities. The modeling of these defects usually either makes use of periodic boundary conditions, by which the defect is replicated periodically, or models a photonic cyrstal of finite extent. HOwever, some applications, for example the cut-off behaviour of a defect mode where the field extends very widely, require methods that can model a defect in an otherwise infinite and perfectly periodic structure. Here we present such a method. It combines the method of fictitious sources with averaging over the Brillouin zone, and we apply it to study the long wavelength behavior of the fundamental mode of photonic crystal fibers

Gather Us In: Building Meaningful Relationships in Catholic Schools Amid a COVID-19 Context

During the COVID-19 pandemic, Catholic schools in the United States pivoted from traditional learning to a remote learning model to maintain continuity of instruction for students. This pivot has served as a catalyst for academic innovation in many Catholic schools. As Catholic schools turn their attention to the possibility of remote learning in the fall of 2020, it is important now to consider how remote learning impacts interpersonal relationships within the school community. This reflective essay examines implications of relationship building in a remote learning context using Cook and Simonds\u27s (2011) framework for relationships for Catholic schools as a lens. By attending to the various relationships within the Catholic school community in a remote learning context, teachers and leaders together can take steps to ensure that the distinctive Catholic identity of the school community remains intact

Robust plasmon waveguides in strongly-interacting nanowire arrays

Arrays of parallel metallic nanowires are shown to provide a tunable, robust, and versatile platform for plasmon interconnects, including high-curvature turns with minimum signal loss. The proposed guiding mechanism relies on gap plasmons existing in the region between adjacent nanowires of dimers and multi-wire arrays. We focus on square and circular silver nanowires in silica, for which excellent agreement between both boundary element method and multiple multipolar expansion calculations is obtained. Our work provides the tools for designing plasmon-based interconnects and achieving high degree of integration with minimum cross talk between adjacent plasmon guides.Comment: 4 pages, 5 figure

Feed My Sheep: A Framework for Lay Educator Faith Formation in Catholic Schools

In this grounded theory study, qualitative data from 11 educators in six diocesan high schools in the New England region revealed an interrelated framework for lay educator faith formation. Dimensions of that framework include the educator’s relationship to the Church, interconnected processes of prayerful reflection and personal encounter, formative experiences with the lives of students, and formation in service as an outward expression of Catholic school identity. Participants also identified how occurrences of disruptive transitions and crises can unite and galvanize Catholic school communities in support of a common faith. By understanding how these dimensions relate to one another, Catholic school leaders can develop intentional and engaging faith formation efforts that lead to faithfully authentic Catholic school communities that more accurately reflect Gospel values and provide a setting where students can encounter the risen Christ

Gather Us In: Building Meaningful Relationships in Catholic Schools amid a COVID-19 Context

During the COVID-19 pandemic, Catholic schools in the United States pivoted from traditional learning to a remote learning model to maintain continuity of instruction for students. This pivot has served as a catalyst for academic innovation in many Catholic schools. As Catholic schools turn their attention to the possibility of remote learning in the fall of 2020, it is important now to consider how remote learning impacts interpersonal relationships within the school community. This reflective essay examines implications of relationship building in a remote learning context using Cook and Simonds\u27s (2011) framework for relationships for Catholic schools as a lens. By attending to the various relationships within the Catholic school community in a remote learning context, teachers and leaders together can take steps to ensure that the distinctive Catholic identity of the school community remains intact

Addressing Teacher Turnover in Catholic Schools: Lessons Learned from the University Consortium for Catholic Education Model

The United States is experiencing a teacher shortage that threatens the vitality of Catholic Schools. Yet, specialized Catholic school teacher formation programs under the umbrella of the University Consortium for Catholic Education model consistently produce Catholic school teachers who are well-formed for their ministry and who tend to remain employed in Catholic schools. This qualitative, grounded theory study sought to answer these two research questions: 1) Why do Catholic school teachers who are graduates of UCCE teacher preparation programs commit to remaining employed in Catholic schools; and 2) How can the experiences of UCCE program graduates be applied to traditional teacher formation and professional development programs that currently exist to support Catholic schools? The findings, which are drawn from the lived experiences of 10 participants, propose a continuity of formation that spans pre-clinical practice, student teaching, and the first critical years of a novice teacher’s employment in a Catholic school. This formation includes intentional collaboration between university programs and PK-12 Catholic school partners in the areas of faith formation, community-building, and coordinated mentoring and coaching support for aspiring and novice Catholic school teachers

What are the living conditions and health status of those who don't report their migration status? a population-based study in Chile

BACKGROUND: Undocumented immigrants are likely to be missing from population databases, making it impossible to identify an accurate sampling frame in migration research. No population-based data has been collected in Chile regarding the living conditions and health status of undocumented immigrants. However, the CASEN survey (Caracterizacion Socio- Economica Nacional) asked about migration status in Chile for the first time in 2006 and provides an opportunity to set the base for future analysis of available migration data. We explored the living conditions and health of self-reported immigrants and respondents who preferred not to report their migration status in this survey. METHODS: Cross-sectional secondary analysis of CASEN survey in Chile in 2006. Outcomes: any disability, illness/accident, hospitalization/surgery, cancer/chronic condition (all binary variables); and the number of medical/emergency attentions received (count variables). Covariates: Demographics (age, sex, marital status, urban/rural, ethnicity), socioeconomic status (education level, employment status and household income), and material standard of living (overcrowding, sanitation, housing quality). Weighted regression models were estimated for each health outcome, crude and adjusted by sets of covariates, in STATA 10.0. RESULTS: About 1% of the total sample reported being immigrants and 0.7% preferred not to report their migration status (Migration Status - Missing Values; MS-MV). The MS-MV lived in more deprived conditions and reported a higher rate of health problems than immigrants. Some gender differences were observed by health status among immigrants and the MS-MV but they were not statistically significant. Regressions indicated that age, sex, SES and material factors consistently affected MS-MVs’ chance of presenting poor health and these patterns were different to those found among immigrants. Great heterogeneity in both the MS-MV and the immigrants, as indicated by wide confidence intervals, prevented the identification of other significantly associated covariates. CONCLUSION: This is the first study to look at the living conditions and health of those that preferred not to respond their migration status in Chile. Respondents that do not report their migration status are vulnerable to poor health and may represent undocumented immigrants. Surveys that fail to identify these people are likely to misrepresent the experiences of immigrants and further quantitative and qualitative research is urgently required