Influence of lithophysal geometry on the uniaxial compression of tuff-like rock

The purpose of this report is to summarize the work and present conclusions of Project Activity Task ORD-FY04-013 conducted under Cooperative Agreement No. DEFC28- 04RW12232 between the U.S. Department of Energy and the Nevada System of Higher Education (NSHE). This document describes results of laboratory testing on analog lithophysal tuff (Hydro-StoneTB®) conducted in the Department of Civil and Environmental Engineering of the University of Nevada at Las Vegas (UNLV) from 2004 to 2006

Evaluation of a Single-Matrix Food Attractant Tephritid Fruit Fly Bait Dispenser for Use in Federal Trap Detection Programs

The use of synthetic food attractant lures for Tephritid fruit fly trapping is presently being incorporated into U.S. state and federal detection programs. These lures consist of ammonium acetate, trimethylamine hydrochloride and putrescine contained in individual packages that are attached to the inside (top) of plastic McPhail-type traps. Two chemical packets are placed in the traps for Anastrepha spp., where as three are attached for Ceratitis capitata. This report presents data on trap captures of the above species comparing the current (individually packaged) baits with a novel dispenser containing either two or three components into a single matrix. Tests were conducted in Florida and Hawaii using hand release of sterile Caribbean fruit fly (Caribfly), Anastrepha suspensa and the Mediterranean fruit fly, Ceratitis capitata (medfly)/ aerially released medfly/ and wild caribfly populations (Florida) and wild medfly (Hawaii). Observations in the Florida study indicated that minor formulation adjustment should increase the efficacy of the Anastrepha attractant, whereas less of an adjustment may be required to capture Ceratitis capitata. Results in open field tests in Hawaii indicated that the three-component synthetic food attractant in a single cone unit was just as effective in capturing wild male and female Medflies as the same food attractants in individual packets. The single matrix has some advantages in handling and ease-of-use, especially with the Multilure trap

2019: Religious Freedom Laws

The common reading resource (see additional documents below) for this event is the Honors thesis of Religion major Samuel Brassell, The Baptist Tradition and Religious Freedom: Recent Trajectories. This 2019 thesis provides an analysis of religious freedom laws in the state of Mississippi. We encourage all attendees to read this common reading resource prior to the event for a more focused conversation during the Q and A session and during the reception.https://egrove.olemiss.edu/policytalks/1000/thumbnail.jp

Mid-Infrared Spectroscopy of Uranus from the Spitzer Infrared Spectrometer: 2. Determination of the Mean Composition of the Upper Troposphere and Stratosphere

Mid-infrared spectral observations Uranus acquired with the Infrared Spectrometer (IRS) on the Spitzer Space Telescope are used to determine the abundances of C2H2, C2H6, CH3C2H, C4H2, CO2, and tentatively CH3 on Uranus at the time of the 2007 equinox. For vertically uniform eddy diffusion coefficients in the range 2200-2600 cm2 s-1, photochemical models that reproduce the observed methane emission also predict C2H6 profiles that compare well with emission in the 11.6-12.5 micron wavelength region, where the nu9 band of C2H6 is prominent. Our nominal model with a uniform eddy diffusion coefficient Kzz = 2430 cm2 sec-1 and a CH4 tropopause mole fraction of 1.6x10-5 provides a good fit to other hydrocarbon emission features, such as those of C2H2 and C4H2, but the model profile for CH3C2H must be scaled by a factor of 0.43, suggesting that improvements are needed in the chemical reaction mechanism for C3Hx species. The nominal model is consistent with a CH3D/CH4 ratio of 3.0+-0.2x10-4. From the best-fit scaling of these photochemical-model profiles, we derive column abundances above the 10-mbar level of 4.5+01.1/-0.8 x 10+19 molecule-cm-2 for CH4, 6.2 +- 1.0 x 10+16 molecule-cm-2 for C2H2 (with a value 24% higher from a different longitudinal sampling), 3.1 +- 0.3 x 10+16 molecule-cm-2 for C2H6, 8.6 +- 2.6 x 10+13 molecule-cm-2 for CH3C2H, 1.8 +- 0.3 x 10+13 molecule-cm-2 for C4H2, and 1.7 +- 0.4 x 10+13 molecule-cm-2 for CO2 on Uranus. Our results have implications with respect to the influx rate of exogenic oxygen species and the production rate of stratospheric hazes on Uranus, as well as the C4H2 vapor pressure over C4H2 ice at low temperatures

Influence of lithophysal porosity on stress-strain properties of Topopah Spring Tuff - numerical analysis

The purpose of the numerical analysis effort of Task 27 of cooperative agreement DE-FC08-98NV12081 was to investigate the effect of lithophysal porosity on the elastic stress-strain properties of the tuff rock mass. Rock mass properties without lithophysal cavities are designated matrix properties. Rock mass properties with lithophysal cavities are designated effective properties. The analysis will be performed for a 6 by 6 square cross-section with a uniform distribution of lithophysal cavities for a variety of porosities. The analyses will be performed using FLAG 2D version 3.5, a Department of Energy qualified software. The analyses will compare the matrix properties to the effective properties

The Influence of lithophysal porosity on the in-situ stress-strain properties of Topopah Spring Tuff

Numerical analysis and a laboratory testing program were conducted in order to investigate the effect of lithophysal porosity on the elastic stress-strain properties of the lithophysae-rich tuff specimens and to find the locations of cavities in both analog and tuff specimens. In the first part of the study, a finite difference mesh containing circular holes was modeled for varying porosity ranges between 5 and 40% using commercially available software FLAG20\u27 version 3.5. Elastic (Young\u27s) modulus and Poisson\u27s ratio were calculated for each setup and normalized with respect to matrix elastic modulus and Poisson\u27s ratio. The moduli calculated through numerical analysis were compared with those determined by the biaxial testing of urethane cubes containing circular holes extending through the cube that have same sizes and distribution of holes as those numerically analyzed. Correlation between moduli determined through testing and numerical analysis was very good. Secondly, ultrasonic testing was conducted on plaster of Paris specimens containing spherical STYROFOAM® inclusions and tuff specimens to determine the locations of the spherical STYROFOAM® inclusions and lithophysal cavities, respectively. The ultrasonic characterization technique was able to detect numerous inclusions within each plaster and some cavities in most of the tuff specimens. The ultrasound technique could not locate the exact positions and dimensions of STYROFOAM® inclusions in plaster of Paris specimens and cavities in tuff specimens but rather roughly detected such zones in specimens. Thirdly, lithophysal tuff and plaster of Paris specimens containing spherical STYROFOAM® inclusions were tested under uniaxial compression and moduli and compressive strengths were determined. Elastic moduli of plaster specimens were normalized with respect to the matrix modulus of a zero porosity plaster specimen. Similar decreasing trend in modulus with increasing porosity was observed and correlation between each data set was good in most of the porosity values. Fifteen tuff specimens, including five specimens from middle non-lithophysal units, were also tested under uniaxial compression. The compressive strength and elastic modulus values for tuff showed a decreasing trend with increasing porosity. The reason of variations in data is due to heterogeneities and discontinuities within the tuff

Influence of Lithophysae Geometry and Distribution on Mechanical Properties of Topopah Spring Tuff

The current Site Recommendation study for the proposed high level nuclear waste repository at Yucca Mountain locates the repository emplacement drifts approximately 81% within the lower lithophysal unit of the Topopah Springs Formation (Tptpll), 4% within the upper lithophysal unit of the Topopah Springs Formation (Tptpul), and roughly 15% within the middle, non-lithophysal unit (Tptpmn) of the same formation. A major geomechanical issue facing the Yucca Mountain Project is to understand the thermomechanical behavior of lithophysal tuff, which comprises roughly 85% of the repository host rock