8,412 research outputs found
Chiral QCD, General QCD Parameterization and Constituent Quark Models
Several recent papers -using effective QCD chiral Lagrangians- reproduced
results obtained with the general QCD parameterization (GP). These include the
baryon 8+10 mass formula, the octet magnetic moments and the coincidental
nature of the "perfect" -3/2 ratio between the magnetic moments of p and n.
Although we anticipated that the GP covers the case of chiral treatments, the
above results explicitly exemplify this fact. Also we show by the GP that -in
any model or theory (chiral or non chiral) reproducing the results of exact
QCD- the Franklin (Coleman Glashow) sum rule for the octet magnetic moments
must be violated.Comment: 10 pages, Latex; abridged version (same results), removed some
reference
Aerodynamic characteristics at Mach numbers from 0.33 to 1.20 of a wing-body design concept for a hypersonic research airplane
An experimental investigation of the static aerodynamic characteristics of a model of one design concept for the proposed National Hypersonic Flight Research Facility was conducted in the Langley 8 foot transonic pressure tunnel. The experiment consisted of configuration buildup from the basic body by adding a wing, center vertical tail, and a three module or six module scramjet engine. The freestream test Mach numbers were 0.33, 0.80, 0.90, 0.95, 0.98, 1.10, and 1.20 at Reynolds numbers per meter ranging from 4.8 x 1 million to 10.4 x 1 million. The test angle of attack range was approximately -4 deg to 22 deg at constant angles of sideslip of 0 deg and 4 deg; the angle of sideslip ranged from about -6 deg to 6 deg at constant angles of attack of 0 deg and 17 deg. The elevons were deflected 0 deg, -10 deg, and -20 deg with rudder deflections of 0 deg and 15.6 deg
Thermoelectric temperature control system for the pushbroom microwave radiometer (PBMR)
A closed loop thermoelectric temperature control system is developed for stabilizing sensitive RF integrated circuits within a microwave radiometer to an accuracy of + or - 0.1 C over a range of ambient conditions from -20 C to +45 C. The dual mode (heating and cooling) control concept utilizes partial thermal isolation of the RF units from an instrument deck which is thermally controlled by thermoelectric coolers and thin film heaters. The temperature control concept is simulated with a thermal analyzer program (MITAS) which consists of 37 nodes and 61 conductors. A full scale thermal mockup is tested in the laboratory at temperatures of 0 C, 21 C, and 45 C to confirm the validity of the control concept. A flight radiometer and temperature control system is successfully flight tested on the NASA Skyvan aircraft
Polarization proximity effect in isolator crystal pairs
We experimentally studied the polarization dynamics (orientation and
ellipticity) of near infrared light transmitted through magnetooptic Yttrium
Iron Garnet crystal pairs using a modified balanced detection scheme. When the
pair separation is in the sub-millimeter range, we observed a proximity effect
in which the saturation field is reduced by up to 20%. 1D magnetostatic
calculations suggest that the proximity effect originates from magnetostatic
interactions between the dipole moments of the isolator crystals. This
substantial reduction of the saturation field is potentially useful for the
realization of low-power integrated magneto-optical devices.Comment: submitted to Optics Letter
ICLARM Progress Report
Report by John Dillon, recently elected Board Chair of ICLARM, on the Center's progress in recovering from a management crisis earlier in 1993. Among other things, Dillon reported on the interim arrangements following the resignation of the director general and board chair, including a new board action plan and mission statement, and the search for a new ICLARM director general.Agenda document, CGIAR International Centers Week, October 1993
Why Intersectionality in Fiction Matters
In lieu of an abstract, here is an excerpt:
Indigenous peoples often say that from maewizhah, or time immemorial, we have gazed upon ae-iko-dawo-dunnauk-mishi-geezhik and created stories that are maumikaud-kummik. In other words, throughout our histories, Native peoples have looked to the heavens, pondered the universe, and composed fantastical tales that, translated literally, are “out of this world.”
This is the very definition of speculative fiction.
To us, storytellers are artists and medicine people who provide mishkiki: medicine, healing, and sometimes even solidarity — or, as we say in Anishinaabemowin, inauwinidiwin, which means collectively becoming a “group walking in a body.” When these creatives place frontline communities and characters at the heart of their stories, readers can challenge themselves to become inauwinidiwin, or the coming together as one body-mind on our beautiful yet beleaguered Mizzu-kummik-quae, or Mother Earth.
About the author:
Grace L. Dillon is a professor in the Indigenous Nations Studies Program at Portland State University, and is of Anishinaabe and European descent. She edited Walking the Clouds: An Anthology of Indigenous Science Fiction and coined the term Indigenous futurisms
Mott, Floquet, and the response of periodically driven Anderson insulators
We consider periodically driven Anderson insulators. The short time behavior
for weak, monochromatic, uniform electric fields is given by linear response
theory and was famously derived by Mott. We go beyond this to consider both
long times---which is the physics of Floquet late time states---and strong
electric fields. This results in a `phase diagram' in the frequency-field
strength plane, in which we identify four distinct regimes. These are: a linear
response regime dominated by pre-existing Mott resonances, which exists
provided Floquet saturation is not reached within a period; a non-linear
perturbative regime, which exhibits multiphoton-absorption in response to the
field; a near-adiabatic regime, which exhibits a primarily reactive response
spread over the entire sample and is insensitive to pre-existing resonances;
and finally an enhanced dissipative regime.Comment: 15 pages, 9 figure
The Effects of Interstate Speed Limit Increases: Fatality Rates and Traffic Diversion Versus Speed Spillover
This thesis examines two panel data sets of 48 states from 1981 to 2009 and utilizes ordinary least squares (OLS) and fixed effects models to explore the relationship between rural Interstate speed limits and fatality rates and whether rural Interstate speed limits affect non-Interstate safety. Models provide evidence that rural Interstate speed limits higher than 55 MPH lead to higher fatality rates on rural Interstates though this effect is somewhat tempered by reductions in fatality rates for roads other than rural Interstates. These results provide some but not unanimous support for the traffic diversion hypothesis that rural Interstate speed limit increases lead to decreases in fatality rates of other roads. To the author’s knowledge, this paper is the first econometric study to differentiate between the effects of 70 MPH speed limits and speed limits above 70 MPH on fatality rates using a multi-state data set. Considering both rural Interstates and other roads, rural Interstate speed limit increases above 55 MPH are responsible for 39,700 net fatalities, 4.1 percent of total fatalities from 1987, the year limits were first raised, to 2009
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