Analytical study of control devices for high amplitude combustion instability Quarterly report

Mathematical model and analysis of combustion processes in annular rocket engines for control of high amplitude combustion instabilit

A study of high frequency nonlinear combustion instability in baffled annular liquid propellant rocket motors. Volume 2 - A user manual for computer programs TRDL and TRDPLT Final report, 25 Aug. 1969 - 25 Sep. 1970

User manual for computer programs to determine high frequency instability in baffled annular liquid propellant rocket engines - Vol.

A study of high frequency nonlinear combustion instability in baffled annular liquid propellant rocket motors, volume 1 Final report, 25 Aug. 1969 - 25 Sep. 1970

High frequency nonlinear combustion instability in baffled annular liquid propellant rocket engines - Vol.

Nonlinear combustion instability in liquid-propellant rocket motors Final report

Mathematical models of nonlinear combustion instabilities in liquid propellant rocket engin

Case Age : Selecting the Best Exemplars for Plausible Reasoning Using Distance in Time or Space

The age of a case (in the CBR sense) is the amount of time that has elapsed between the time that the case originally occurred and the time of the current reasoning activity. People engaged in plausible reasoning tasks will, under appropriate circumstances, use the age of retrieved prior cases to filter and discard them, or to select among alternatives by their recency. This paper examines how the age of a case (and its spatial analog) are used by people in plausible and case-based reasoning tasks. I will argue that (1) The age of a retrieved case is an important factor in case relevance judgments for certain kinds of inferences. (2) When case age is relevant, more recent cases are usually, but not always, preferred to older ones (the all other things being equal" caveat). Finally, I will argue that, somewhat surprisingly, (3) case age cannot be used as an index into memory given some commonly held assumptions about the nature of the retrieval process because it varies with the time of retrieval. This limits its use to post-retrieval processes, such as the filtering of already retrieved cases

A study of high frequency nonlinear combustion instability in baffled annular liquid propellant rocket motors

Computer program contains mathematical model which provides relationship between engine gas dynamics and combustion processes. Mathematically simulated explosions initiate gas disturbances. Design methods for damping disturbances can be studied to prevent future engine shutdown or destruction

Temperature sensitivity of the pyloric neuromuscular system and its modulation by dopamine

We report here the effects of temperature on the p1 neuromuscular system of the stomatogastric system of the lobster (Panulirus interruptus). Muscle force generation, in response to both the spontaneously rhythmic in vitro pyloric network neural activity and direct, controlled motor nerve stimulation, dramatically decreased as temperature increased, sufficiently that stomach movements would very unlikely be maintained at warm temperatures. However, animals fed in warm tanks showed statistically identical food digestion to those in cold tanks. Applying dopamine, a circulating hormone in crustacea, increased muscle force production at all temperatures and abolished neuromuscular system temperature dependence. Modulation may thus exist not only to increase the diversity of produced behaviors, but also to maintain individual behaviors when environmental conditions (such as temperature) vary

Maestras Dedicadas: A Portrait of Chicana Teacher Activism in Troubled Times

Two researchers document how veteran Chicana teacher activists, who have taught more than 15 years, remain in the classroom and challenge the pedagogy of control in urban schools. Our findings show that networking and relationships for Chicana teacher activists is developed on the basis of a common political agenda and a love of children. All of these teachers assist their students in retaining their Chicana/o language, culture, and Chicana/o identity is of primary importance and subversively alter the standardized curriculum to do so. The testimonios of these maestras dedicadas provide insights into the daily challenges veteran Chicana teachers face while negotiating the classroom during these troubled times. The seasoned activists also offer advice to new teacher activists

A Statistical Treatment of the Gamma-Ray Burst "No Host Galaxy" Problem: II. Energies of Standard Candle Bursts

With the discovery that the afterglows after some bursts are coincident with faint galaxies, the search for host galaxies is no longer a test of whether bursts are cosmological, but rather a test of particular cosmological models. The methodology we developed to investigate the original "no host galaxy" problem is equally valid for testing different cosmological models, and is applicable to the galaxies coincident with optical transients. We apply this methodology to a family of models where we vary the total energy of standard candle bursts. We find that total isotropic energies of E<2e52~erg are ruled out while log(E)~53 erg is favored.Comment: To appear in Ap.J., 514, 15 pages + 7 figures, AASTeX 4.0. Revisions are: additional author, updated data, and minor textual change