Biomedical subjects
JL Smith
Publications and source records attributed to JL Smith.
&mgr;(+) knight shift measurements in U0.965Th0.035Be13 single crystals
Muon spin rotation ( &mgr;SR) measurements of the temperature dependence of the &mgr;(+) Knight shift in single crystals of U0. 965Th0.035Be13 have been used to study the static spin susceptibility chi(s) below the transition temperatures T(c1) and T(c2). While an abrupt reduction of chi(s) with decreasing temperature is observed below T(c1), chi(s) does not change below T(c2) and remains at a value below the normal-state susceptibility chi(n). In the normal state we find an anomalous anisotropic temperature dependence of the transferred hyperfine coupling between the &mgr;(+) spin and the U 5f electrons.
Spectroscopic evidence for unconventional superconductivity in UBe13
We report on measurements of the differential conductivity G of UBe13-Au contacts, which reveal the existence of low-energy Andreev surface bound states. These bound states are identified via huge conductance peaks at zero bias that may form only in superconductors with nontrivial energy-gap functions. From the voltage dependence of G at T 6.7, much in excess of the weak coupling BCS value of 3.5, and directly indicating strong coupling effects in superconducting UBe13.
Estimation of Nitrous Oxide Emissions from US Grasslands.
/ Nitrous oxide (N(2)O) emissions from temperate grasslands are poorly quantified and may be an important part of the atmospheric N(2)O budget. In this study N(2)O emissions were simulated for 1052 grassland sites in the United States using the NGAS model of Parton and others (1996) coupled with an organic matter decomposition model. N(2)O flux was calculated for each site using soil and land use data obtained from the National Resource Inventory (NRI) database and weather data obtained from NASA. The estimates were regionalized based upon temperature and moisture isotherms. Annual N(2)O emissions for each region were based on the grassland area of each region and the mean estimated annual N(2)O flux from NRI grassland sites in the region. The regional fluxes ranged from 0.18 to 1.02 kg N(2)O N/ha/yr with the mean flux for all regions being 0.28 kg N(2)O N/ha/yr. Even though fluxes from the western regions were relatively low, these regions made the largest contribution to total emissions due to their large grassland area. Total US grassland N(2)O emissions were estimated to be about 67 Gg N(2)O N/yr. Emissions from the Great Plains states, which contain the largest expanse of natural grassland in the United States, were estimated to average 0.24 kg N(2)O N/ha/yr. Using the annual flux estimate for the temperate Great Plains, we estimate that temperate grasslands worldwide may potentially produce 0.27 Tg N(2)O N/yr. Even though our estimate for global temperate grassland N(2)O emissions is less than published estimates for other major temperate and tropical biomes, our results indicate that temperate grasslands are a significant part of both United States and global atmospheric N(2)O budgets. This study demonstrates the utility of models for regional N(2)O flux estimation although additional data from carefully designed field studies is needed to further validate model results.
Forming and inhibiting PRT active sites.
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Vascular surgical society of great britain and ireland: impact of spontaneous embolization on cognitive function
BACKGROUND: Although microembolization may not be associated with focal neurological events following carotid endarterectomy (CEA), it might contribute towards cognitive impairment. METHODS: Forty-nine patients undergoing CEA underwent 30 min of preoperative ipsilateral transcranial Doppler (TCD) monitoring and a battery of tests of cognitive function, and the results were compared with those of age-matched normal controls. RESULTS: Seven patients who were spontaneously embolizing had significantly worse preoperative cognitive function scores than 42 patients with no recorded emboli (P = 0.03). Overall, patients undergoing CEA had a significant cognitive deficit compared with age-matched normal controls. CONCLUSION: Patients who have evidence of spontaneous preoperative embolization on TCD monitoring have a greater degree of preoperative cognitive impairment. This finding underlines the potential clinical importance of microembolization and suggests that this phenomenon should be investigated further.
On the Magnetic Interactions in Metal-Be13 Compounds.
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Kosterlitz-Thouless Transition and Short Range Spatial Correlations in an Extended Hubbard Model.
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Electrical resistivity of UBe13 in high magnetic fields.
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Superconductivity in heavy-fermion CeRh2Si2.
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Inductive measurements of UPt3 in the superconducting state.
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Competition between magnetism and superconductivity in TmNi2B2C observed by muon-spin rotation.
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Effects of boron substitution on the superconducting state of UBe13.
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Nonlinear susceptibility: A direct test of the quadrupolar Kondo effect in UBe13.
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Magnetic oscillations in the heavy-fermion superconductor UBe13.
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Anomalous magnetic torque in UBe13: Evidence for a field-induced magnetic phase transition.
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Comparison of nuclear spin relaxation rates at Y and O sites in YBa2Cu3O7-y.
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