Few-Boson Processes in the Presence of an Attractive Impurity under One-Dimensional Confinement

We consider a few-boson system confined to one dimension with a single distinguishable particle of lesser mass. All particle interactions are modeled with $\delta$-functions, but due to the mass imbalance the problem is nonintegrable. Universal few-body binding energies, atom-dimer and atom-trimer scattering lengths are all calculated in terms of two parameters, namely the mass ratio: $m_{\text{L}}/m_{\text{H}}$, and ratio $g_{\text{HH}}/g_{\text{HL}}$ of the $\delta$-function couplings. We specifically identify the values of these ratios for which the atom-dimer or atom-trimer scattering lengths vanish or diverge. We identify regions in this parameter space in which various few-body inelastic process become energetically allowed. In the Tonks-Girardeau limit ($g_{\text{HH}}\rightarrow \infty$), our results are relevant to experiments involving trapped fermions with an impurity atom

Centrifugal terms in the WKB approximation and semiclassical quantization of hydrogen

A systematic semiclassical expansion of the hydrogen problem about the classical Kepler problem is shown to yield remarkably accurate results. Ad hoc changes of the centrifugal term, such as the standard Langer modification where the factor l(l+1) is replaced by (l+1/2)^2, are avoided. The semiclassical energy levels are shown to be exact to first order in $\hbar$ with all higher order contributions vanishing. The wave functions and dipole matrix elements are also discussed.Comment: 5 pages, to appear in Phys. Rev.

Seston quality drives feeding, stoichiometry and excretion of zebra mussels

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/136507/1/fwb12892.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/136507/2/fwb12892_am.pd

Mercury Exposure and Antinuclear Antibodies among Females of Reproductive Age in the United States: NHANES

Background: Immune dysregulation associated with mercury has been suggested, though data in the general population are lacking. Chronic exposure to low levels of methylmercury (organic) and inorganic mercury is common, such as through fish consumption and dental amalgams. Objective: To examine associations between mercury biomarkers and antinuclear antibody (ANA) positivity and titer strength. Methods: Among females 16-49 years (n=1352) from the National Health and Nutrition Examination Survey (NHANES) 1999-2004, we examined cross-sectional associations between mercury and ANAs (indirect immunofluorescence; cutoff ≥1:80). Three biomarkers of mercury exposure were utilized: hair (available 1999-2000) and total blood (1999-2004) predominantly represented methylmercury, and urinary (1999-2002) inorganic. Survey statistics were used. Multivariable modeling adjusted for several covariates, including age and omega-3 fatty acids. Results: 16% of females were ANA-positive; 96% of ANA-positives had a nuclear staining pattern of speckled. Mercury geometric means (standard deviations) were: 0.22 (0.03) ppm hair, 0.92 (0.05) µg/L blood, and 0.62 (0.04) µg/L urinary. Hair and blood, but not urinary, mercury were associated with ANA positivity (sample sizes 452, 1352, and 804, respectively), adjusting for confounders: hair odds ratio (OR)=4.10 (95% CI: 1.66, 10.13); blood OR=2.32 (95% CI: 1.07, 5.03) comparing highest versus lowest quantiles. Magnitudes of association were strongest for high-titer (≥1:1280) ANA: hair OR=11.41 (95% CI: 1.60, 81.23); blood OR=5.93 (95% CI: 1.57, 22.47). Conclusions: Methylmercury, at low levels generally considered safe, was associated with subclinical autoimmunity among reproductive-age females. Autoantibodies may predate clinical disease by years, thus methylmercury exposure may be relevant to future autoimmune disease risk.This work was supported by NIH/NIEHS K01ES019909, NIH/NIEHS P30ES017885, and NIH/NCRR UL1RR024986. ECS was supported in part by an Arthritis Foundation Health Professional New Investigator Award.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/110512/1/SOMERS_EHP.AdvancePubl 02102015.acco.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/110512/2/Somers_EHP Suppl-1408751.s001.508.pdf114Description of SOMERS_EHP.AdvancePubl 02102015.acco.pdf : Main ArticleDescription of Somers_EHP Suppl-1408751.s001.508.pdf : Supplementary Materia

Development of recurrent coastal plume in Lake Michigan observed for first time

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94637/1/eost11132.pd

Four Rivers second generation Pressurized Circulating Fluidized Bed Combustion Project

Air Products has been selected in the DOE Clean Coal Technology Round V program to build, own, and operate the first commercial power plant using second generation Pressurized Circulating Fluidized Bed (PCFB) combustion technology. The four Rivers Energy Project (Four Rivers) will produce up to 400,000 lb/hr steam, or an equivalent gross capacity of 95 MWe. The unit will be used to repower an Air Products chemicals manufacturing facility in Calvert City, Kentucky

Observations and modeling of wave-supported sediment gravity flows on the Po prodelta and comparison to prior observations from the Eel shelf

Author Posting. © The Authors, 2006. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Continental Shelf Research 27 (2007): 375-399, doi:10.1016/j.csr.2005.07.008.A mooring and tripod array was deployed from the fall of 2002 through the spring of 2003 on the Po prodelta to measure sediment transport processes associated with sediment delivered from the Po River. Observations on the prodelta revealed wave-supported gravity flows of high concentration mud suspensions that are dynamically and kinematically similar to those observed on the Eel shelf (Traykovski et al., 2000). Due to the dynamic similarity between the two sites, a simple one-dimensional across-shelf model with the appropriate bottom boundary condition was used to examine fluxes associated with this transport mechanism at both locations. To calculate the sediment concentrations associated with the wave-dominated and wave-current resuspension, a bottom boundary condition using a reference concentration was combined with an “active layer” formulation to limit the amount of sediment in suspension. Whereas the wave-supported gravity flow mechanism dominates the transport on the Eel shelf, on the Po prodelta flux due to this mechanism is equal in magnitude to transport due to wave resuspension and wind-forced mean currents in cross-shore direction. Southward transport due to wave resuspension and wind forced mean currents move an order of magnitude more sediment along-shore than the downslope flux associated wave-supported gravity flows.This work funded by the U.S. Office of Naval Research under grant number #N00014-02-10378, under the direction of program manager, Tom Drake

1937: Abilene Christian College Bible Lectures - Full Text

Delivered in the auditorium of Abilene Christian College, Abilene, Texas, February 193

Decarboxylative and dehydrative coupling of dienoic acids and pentadienyl alcohols to form 1,3,6,8-tetraenes

Dienoic acids and pentadienyl alcohols are coupled in a decarboxylative and dehydrative manner at ambient temperature using Pd(0) catalysis to generate 1,3,6,8-tetraenes. Contrary to related decarboxylative coupling reactions, an anion-stabilizing group is not required adjacent to the carboxyl group. Of mechanistic importance, it appears that both the diene of the acid and the diene of the alcohol are required for this reaction. To further understand this reaction, substitutions at every unique position of both cou- pling partners was examined and two potential mechanisms are presented

Radiographic Lucencies in the Medial Femoral Condyle of Thoroughbred Sale Yearlings: A Preliminary Investigation of the Effect on Race Records

Radiographic lucencies in the medial femoral condyle of Thoroughbred sale yearlings reduce the likelihood a horse will sell at auction and the price paid compared with unaffected horses in the same sale; however, no difference in racing results was found between affected and unaffected horses. Authors' addresses: Equine Medical Associates, 996 Nandino Boulevard, Lexington, KY 40511 (Whitman, Morehead, Prichard, Hance); and th