Resource envelope concepts for mission planning

Seven proposed methods for creating resource envelopes for Space Station Freedom mission planning are detailed. Four reference science activity models are used to illustrate the effect of adding operational flexibility to mission timelines. For each method, a brief explanation is given along with graphs to illustrate the application of the envelopes to the power and crew resources. The benefits and costs of each method are analyzed in terms of resource utilization. In addition to the effect on individual activities, resource envelopes are analyzed at the experiment level

Payload crew utilization for spacelab missions

Planned payload crew utilization on Spacelab mission are analyzed to establish trends and guidelines. The study included missions that have flow to date as well as those in planning. Available data were analyzed on the basis of four major timeline iterations that occur during mission design. Data were categorized and assessed by crewmember, flight day, and mission. Based on the results of this analysis, it was recommended that for the Requirements Review and Preliminary Design Review iterations the maximum utilization per shift should be 75 percent for the Payload Specialist (PS) and 65 percent for the Mission Specialist (MS); and for the basic and final iterations, the maximum utilization shift should be 85 percent for the PS and 75 percent for the MS. Additional recommendations include limiting the amount of activity during the first two shifts whenever possible and establishing a common set of guidelines for the calculations of crew utilization

Sa-9, 8, and 10 dispersion analysis

Saturn 8, 9, and 10 launch vehicles - dispersions and application to nominal trajectory, mission objectives, root sum square method, and engine- out capabilit

Diabetes Self-Management in a Latino Social Environment

Purpose: The purpose of this qualitative descriptive study was to explore the socio-cultural influences and social context associated with living with type 2 diabetes among rural, migrant Latino adults. Methods: A qualitative descriptive study using grounded theory techniques was conducted. In-depth semi-structured interviews were completed with ten participants (6 female and 4 male) ranging in age from 46-65 years and duration of diabetes diagnosis ranging from 1.5- 40 years. Results: An over-arching meta-theme Self Management in a Social Environment emerged. Every aspect of the process of self-management, as described in the four major themes, (1) Family Cohesion, (2) Social Stigma of Disease, (3) Social Expectations/ Perception of “Illness,” and (4) Disease Knowledge and Understanding, was influenced by the social context

Diabetes Self-Management in the Migrant Latino Population

This article will present an in-depth exploration and synthesis of current literature that informs nursing knowledge of diabetes self-management for the migrant Latino population. Extensive research in diabetes care has been conducted, however, there is a significant knowledge gap related to the factors that influence the achievement of glycemic control and self-management practices of the Latino population. Based on well-documented disparities in complications and health outcomes among Latinos when compared with White Americans, there is sufficient evidence to question whether traditional White beliefs about self-management are successful or appropriate for the Latino population in general and migrants specifically. Traditional models view self-management as an individual’s responsibility. Whether this view is congruent with the collectivist cultural tradition held by many Latinos is unclear. Equally unclear is the degree to which using traditional models of self-management in teaching about managing type 2 diabetes influences health outcomes in this population. Culturally congruent care and nursing interventions involve much more than an understanding of language and dietary preferences

Radio Spectral Index and Expansion of 3C58

We present new observations of the plerionic supernova remnant 3C58 with the VLA at 74 and 327 MHz. In addition, we re-reduced earlier observations at 1.4 and 4.9 GHz taken in 1973 and 1984. Comparing these various images, we find that: 1. the remnant has a flat and relatively uniform spectral index distribution, 2. any expansion of the remnant with time is significantly less than that expected for uniform, undecelerated expansion since the generally accepted explosion date in 1181 A.D., and 3. there is no evidence for a non-thermal synchrotron emission shell generated by a supernova shock wave, with any such emission having a surface brightness of <1 x 10^(-21) W / (m^2 Hz sr) at 327 MHz.Comment: 18 pages, 7 Figures, Latex, Accepted for publication in the Astrophysical Journa

Invariant Box-Parameterization of Neutrino Oscillations

The model-independent "box" parameterization of neutrino oscillations is examined. The invariant boxes are the classical amplitudes of the individual oscillating terms. Being observables, the boxes are independent of the choice of parameterization of the mixing matrix. Emphasis is placed on the relations among the box parameters due to mixing--matrix unitarity, and on the reduction of the number of boxes to the minimum basis set. Using the box algebra, we show that CP-violation may be inferred from measurements of neutrino flavor mixing even when the oscillatory factors have averaged. General analyses of neutrino oscillations among $n\ge 3$ flavors can readily determine the boxes, which can then be manipulated to yield magnitudes of mixing matrix elements