23,717 research outputs found
Is the Human Zygote a Person?
Roll 24. Lodger's Thanksgiving / Gym. Image 1 of 10. ( 30 November, 1952; 2 December, 1952) [PHO 1.24.10]The Boleslaus Lukaszewski (Father Luke) Photographs contain more than 28,000 images of Saint Louis University people, activities, and events between 1951 and 1970. The photographs were taken by Boleslaus Lukaszewski (Father Luke), a Jesuit priest and member of the University's Philosophy Department faculty
Fluctuating Membranes with Tilt Order
Thermal fluctuations are important for amphiphilic bilayer membranes since
typical bending stiffnesses can be a few . The rod-like constituent
molecules are generically tilted with respect to the local normal for packing
reasons. We study the effects of fluctuations on membranes with nematic order,
a simplified idealization with the same novel features as realistic tilt order.
We find that nematic membranes lie in the same universality class as hexatic
membranes, {\it i.e.} the couplings that distinguish nematic from hexatic order
are marginally irrelevant. Our calculation also illustrates the advantages of
conformal gauge, which brings great conceptual and technical simplifications
compared to the more popular Monge gauge.Comment: 13 pages; print this using plain Te
Illinois River 2000 Pollutant Loads at Arkansas 59 Bridge
Automatic water samplers and a U. S. Geological Survey gauging station were established in 1995 on the main stem of the Illinois River at the Arkansas Highway 59 Bridge. Since that time, continuous stage and discharge measurements and water quality sampling have been used to determine pollutant concentrations and loads in the Arkansas portion of the Illinois River. This report represents the results from the measurement and sampling for January 1, 2000 to December 31, 200
Illinois River 1998 Nutrient and Suspended Sediment Loads at Arkansas Highway 59 Bridge
Automatic water samplers and a U.S. Geological Survey (USGS) gauging station were established in 1995 on the main stem of the Illinois River at the Arkansas Highway 59 Bridge. Since that time, continuous stage and discharge measurements and water quality sampling have been used to determine pollutant concentrations and loads in the Arkansas portion of the Illinois River. This report represents the results from the measurement and sampling for January 1, 1998 to December 31, 1998
Illinois River 2001 Pollutant Loads At Arkansas Highway 59 Bridge
Automatic water samplers and a U. S. Geological Survey gauging station were established in 1995 on the main stem of the Illinois River at the Arkansas Highway 59 Bridge. Since that time, continuous stage and discharge measurements and water quality sampling have been used to determine pollutant concentrations and loads in the Arkansas portion of the Illinois River. This report represents the results from the measurement and sampling for January 1, 2001 to December 31, 2001
Autumn Foods of White-Tailed Deer in Arkansas
Rumen contents from 65 hunter-harvested deer were collected and analyzed during 1985-86 to estimate the principal autumn foods consumed by white-tailed deer inhabiting the Ozark Mountains, Arkansas River Valley, and Gulf Coastal Plain regions of Arkansas. Deer in the Ozarks and Coastal Plain fed heavily on woody browse species, which comprised 99% of rumina identified from these 2 regions. Acorns were the primary food of deer in these heavily forested areas. Acorns and other woody browse were less important to deer inhabiting the Arkansas River Valley. In this region of interspersed agricultural fields and bottomland forests, soybeans and corn comprised 75% of the diet, and acorns accounted for only 2%
The Fall and the Rise of X-rays from Dwarf Novae in Outburst: RXTE Observations of VW Hydri and WW Ceti
In a dwarf nova, the accretion disk around the white dwarf is a source of
ultraviolet, optical, and infrared photons, but is never hot enough to emit
X-rays. Observed X-rays instead originate from the boundary layer between the
disk and the white dwarf. As the disk switches between quiescence and outburst
states, the 2-10 keV X-ray flux is usually seen to be anti-correlated with the
optical brightness. Here we present RXTE monitoring observations of two dwarf
novae, VW Hyi and WW Cet, confirming the optical/X-ray anti-correlation in
these two systems. However, we do not detect any episodes of increased hard
X-ray flux on the rise (out of two possible chances for WW Cet) or the decline
(two for WW Cet and one for VW Hyi) from outburst, attributes that are clearly
established in SS Cyg. The addition of these data to the existing literature
establishes the fact that the behavior of SS Cyg is the exception, rather than
the archetype as is often assumed. We speculate on the origin of the diversity
of behaviors exhibited by dwarf novae, focusing on the role played by the white
dwarf mass.Comment: PASP, in press (18 pages including 3 figures
Nonlinear Acoustics at GHz Frequencies in a Viscoelastic Fragile Glass Former
Using a picosecond pump-probe ultrasonic technique, we study the propagation
of high-amplitude, laser-generated longitudinal coherent acoustic pulses in the
viscoelastic fragile glass former DC704. We observe an increase of almost ten
percent in acoustic pulse propagation speed of its leading shock front at the
highest optical pump fluence which is a result of the supersonic nature of
nonlinear propagation in the viscous medium. From our measurement we deduce the
nonlinear acoustic parameter of the glass former in the GHz frequency range
across the glass transition temperature.Comment: 5 pages, 3 figure
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