79 research outputs found
Agile Development Methods for Space Operations
Main stream industry software development practice has gone from a traditional waterfall process to agile iterative development that allows for fast response to customer inputs and produces higher quality software at lower cost. How can we, the space ops community, adopt state of the art software development practice, achieve greater productivity at lower cost, and maintain safe and effective space flight operations? At NASA Ames, we are developing Mission Control Technologies Software, in collaboration with Johnson Space Center (JSC) and, more recently, the Jet Propulsion Laboratory (JPL)
An Analysis of Student Evaluations of Instruction for the Fall Quarter 2004
An analysis of student evaluations of teaching. Trends, issues, etc
Prospectus, September 24, 1980
RODNEY DANGERFIELD GETS SOME RESPECT FROM PC; PCF group greets newcomers; Parkland offers COSMOS telecourse; Clerks to be on campus to register voters; Women\u27s Program discusses importance of adequate diet; Breakdown of budget: Where does all your money go?; Women\u27s Program presents last of self-care series; Parkland College Board of Trustees meets; Members needed; A friend is someone who...; Family Life Program offers Living in Step ; Chimera Inc. offers workshop; PACT presents seminar for expectant parents; Steve Goodman: A talented performer; The Ducks have a good time; Rodney Dangerfield: I don\u27t get no respect; He will always get respect in Champaign-Urbana ; Francis named Outstanding Young Men of America ; Eisner to hold celebration; Classifieds; Showcase and workshop Oct. 8; PACT presents program: Early childhood; Volleyballers win two; Upsets spoil Fast Freddy; All you lost freshman-- pay attention to this story; Fast Freddy Contesthttps://spark.parkland.edu/prospectus_1980/1020/thumbnail.jp
The Freshmen Interest Groups (FIGs) Program Report: Course Offerings in Fall, 2008
The First-year Interest Group (FIG) program at Western Washington University has been a curricular option for first-year students since 1999. In the fall, 2008, it entered its tenth iteration. Briefly described, FIG program students register for a cluster of three courses: two general education courses (usually quite large) linked with a two-credit seminar (maximum enrollment 25). The FIG program is modeled on best practices culled from first year experience literature and poses that the learning community environment created by the combination of large lecture courses and a small seminar can help students connect more quickly to university life, as well as foster a smoother transition from high school to college. On average, about 20% of each in-coming freshmen class has opted to enroll in a FIG cluster
Core-Collapse Simulations of Rotating Stars
We present the results from a series of two-dimensional core-collapse
simulations using a rotating progenitor star. We find that the convection in
these simulations is less vigorous because a) rotation weakens the core bounce
which seeds the neutrino-driven convection and b) the angular momentum profile
in the rotating core stabilizes against convection. The limited convection
leads to explosions which occur later and are weaker than the explosions
produced from the collapse of non-rotating cores. However, because the
convection is constrained to the polar regions, when the explosion occurs, it
is stronger along the polar axis. This asymmetric explosion can explain the
polarization measurements of core-collapse supernovae. These asymmetries also
provide a natural mechanism to mix the products of nucleosynthesis out into the
helium and hydrogen layers of the star. We also discuss the role the collapse
of these rotating stars play on the generation of magnetic fields and neutron
star kicks. Given a range of progenitor rotation periods, we predict a range of
supernova energies for the same progenitor mass. The critical mass for black
hole formation also depends upon the rotation speed of the progenitor.Comment: 16 pages text + 13 figures, submitted to Ap
Prospectus, October 1, 1980
HAVE YOU REGISTERED TO VOTE YET? REGISTER THE PAINLESS WAY--ON CAMPUS; Election \u2780: The man behind the woman; Handicrafts taught to senior citizens; Got a pet peeve, gripe, or opinion? Write PROSPECTUS\u27 editor!; MMWW gives calendar of topics; Make Christmas gift decorations now; Student Government will hold O.RG.I.I. in Lounge; Record Enrollment: Fall enrollment sets new record; Activities set for Society; Insurance offered; No overdubbing results in very, very good record; Letters to the editor: Student wants late breakfast; Our Mistake!; Urbana student wins PC faculty wives\u27 $200; Park district has youth fall classes; Give Blood Today; Science You Can See: The chemistry of photography; Parkland student reps needed for committees; New officers named for Parkland\u27s PATH; Children\u27s art exhibit to be Oct. 4, 9-9, Market Place Mall; Arts activities and events need co-sponsors; PLATO proves very popular; Peptic ulcers October 7 topic; PCF to hear Christian teachers; Need it? Financial aid still available; CPA Accounting Careers Conference to be Nov. 15; Classifieds; Football/tennis intermurals begin; Champaign Park District organizes basketball league; PC Datebook; Jeff Dodson places second in LT gold invitational; Women\u27s V-ball record upped; PC baseball player wins; Gal Friday tries predicting; Fast Freddy Contesthttps://spark.parkland.edu/prospectus_1980/1019/thumbnail.jp
Rates and Delay Times of Type Ia Supernovae
We analyze the evolution of binary stars to calculate synthetic rates and
delay times of the most promising Type Ia Supernovae progenitors. We present
and discuss evolutionary scenarios in which a white dwarf reaches the
Chandrasekhar-mass and potentially explodes in a Type Ia supernova. We
consider: Double Degenerate (DDS), Single Degenerate (SDS), and AM Canum
Venaticorum scenarios. The results are presented for two different star
formation histories; burst (elliptical-like galaxies) and continuous
(spiral-like galaxies). It is found that delay times for the DDS in our
standard model (with common envelope efficiency alpha = 1) follow a power-law
distribution. For the SDS we note a wide range of delay times, while AM CVn
progenitors produce a short burst of SNe Ia at early times. We point out that
only the rates for two merging carbon-oxygen white dwarfs, the only systems
found in the DDS, are consistent with the observed rates for typical Milky
Way-like spirals. We also note that DDS progenitors are the dominant population
in elliptical galaxies. The fact that the delay time distribution for the DDS
follows a power-law implies more Type Ia supernovae (per unit mass) in young
rather than in aged populations. Our results do not exclude other scenarios,
but strongly indicate that the DDS is the dominant channel generating SNe Ia in
spiral galaxies, at least in the framework of our adopted evolutionary models.
Since it is believed that white dwarf mergers cannot produce a thermonuclear
explosion given the current understanding of accreting white dwarfs, either the
evolutionary calculations along with accretion physics are incorrect, or the
explosion calculations are inaccurate and need to be revisited (Abridged).Comment: 14 pages, 2 tables, 3 figures, submitted to Ap
Perspectives on Astrophysics Based on Atomic, Molecular, and Optical (AMO) Techniques
About two generations ago, a large part of AMO science was dominated by
experimental high energy collision studies and perturbative theoretical
methods. Since then, AMO science has undergone a transition and is now
dominated by quantum, ultracold, and ultrafast studies. But in the process, the
field has passed over the complexity that lies between these two extremes. Most
of the Universe resides in this intermediate region. We put forward that the
next frontier for AMO science is to explore the AMO complexity that describes
most of the Cosmos.Comment: White paper submission to the Decadal Assessment and Outlook Report
on Atomic, Molecular, and Optical (AMO) Science (AMO 2020
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