Fe I and Fe II Abundances of Solar-Type Dwarfs in the Pleiades Open Cluster

We have derived Fe abundances of 16 solar-type Pleiades dwarfs by means of an equivalent width analysis of Fe I and Fe II lines in high-resolution spectra obtained with the Hobby - Eberly Telescope and High Resolution Spectrograph. Abundances derived from Fe II lines are larger than those derived from Fe I lines (herein referred to as over-ionization) for stars with Teff < 5400 K, and the discrepancy (deltaFe = [Fe II/H] - [Fe I/H]) increases dramatically with decreasing Teff, reaching over 0.8 dex for the coolest stars of our sample. The Pleiades joins the open clusters M 34, the Hyades, IC 2602, and IC 2391, and the Ursa Major moving group, demonstrating ostensible over-ionization trends. The Pleiades deltaFe abundances are correlated with Ca II infrared triplet and Halpha chromospheric emission indicators and relative differences therein. Oxygen abundances of our Pleiades sample derived from the high-excitation O I triplet have been previously shown to increase with decreasing Teff, and a comparison with the deltaFe abundances suggests that the over-excitation (larger abundances derived from high excitation lines relative to low excitation lines) and over-ionization effects that have been observed in cool open cluster and disk field main sequence (MS) dwarfs share a common origin. Star-to-star Fe I abundances have low internal scatter, but the abundances of stars with Teff < 5400 K are systematically higher compared to the warmer stars. The cool star [Fe I/H] abundances cannot be connected directly to over-excitation effects, but similarities with the deltaFe and O I triplet trends suggest the abundances are dubious. Using the [Fe I/H] abundances of five stars with Teff > 5400 K, we derive a mean Pleiades cluster metallicity of [Fe/H] = +0.01 +/- 0.02.Comment: 32 pages, 7 figures, 7 tables; accepted by PAS

Climate Change and Real Estate: How Environmental Risks and Policies Impact Markets

Climate change could worsen environmental conditions that affect real estate values, such as extreme weather events and coastal erosion. But policies to prevent climate change can also affect real estate values, for example through higher energy prices and land use regulation. This lecture will examine the linkages between the climate change risks, climate policy, and real estate markets. We will also discuss the likely regional economic effects of recent proposed climate legislation

EPA\u27s Proposed Greenhouse Gas Regulation for Power Plants: How does it Work and what will it mean for Nevada?

In June, the Environmental Protection Agency proposed important new limits on carbon dioxide emissions from existing U.S. power plants. The new regulation is the centerpiece of the Obama Administration’s climate policy. If the controversial rule is finalized as planned next year, it will cover about a third of U.S. greenhouse gas emissions. This lecture will explain the legal, environmental, and economic issues posed by the rule and highlight the important role for states in implementing it. The lecture will also review the implications and options for achieving the emissions target the EPA set for Nevada

Climate Change Economics 101

Outline of Talk:- Climate change is a market failure- Climate and energy facts- Economically efficient policy design- Economics of Domestic Legislatio

Reducing Costs of Delivering Feed to Cattle - Supplementation Frequency

Winter supplementation of beef cattle is an important economic and production decision that producers make each year. Supplementation is often necessary to overcome nutrient deficiencies to allow adequate cattle performance. However, supplementation is an expensive input cost, par-ticularly with current high feed prices and deliv¬ery costs. The initial decision is about the correct type and amount of feed to use as the supplement, with the goal to provide the needed nutrients at the least feed cost. After this decision, opportuni¬ties for reducing other costs of supplementation should be considered. One option that can have a major impact on input costs is how often supple-ment is delivered. Reducing the frequency that supplement is delivered can reduce fuel, labor, and machinery costs. The important concern is creating the right balance between frequency of delivery and cattle performance

Conformal GaP layers on Si wire arrays for solar energy applications

We report conformal, epitaxial growth of GaP layers on arrays of Si microwires. Silicon wires grown using chlorosilane chemical vapor deposition were coated with GaP grown by metal-organic chemical vapor deposition. The crystalline quality of conformal, epitaxial GaP/Si wire arrays was assessed by transmission electron microscopy and x-ray diffraction. Hall measurements and photoluminescence show p- and n-type doping with high electron mobility and bright optical emission. GaP pn homojunction diodes on planar reference samples show photovoltaic response with an open circuit voltage of 660 mV

Do Gasoline Prices Affect Residential Property Values?

This paper estimates the effect of gasoline prices on home values and explores the degree to which the relationship varies across a city. Using data from 930,702 home sales in Clark County, Nevada, from 1976 through 2010, we find that gasoline prices have significantly different effects on the sales price of homes in different neighborhoods. A ten percent increase in gasoline prices is associated with changes in location-specific average home values that span a range of over $13,000. This suggests that energy policies may affect household housing wealth via gasoline prices, a heretofore unrecognized distributional outcome

Quantum Bose Josephson Junction with binary mixtures of BECs

We study the quantum behaviour of a binary mixture of Bose-Einstein condensates (BEC) in a double-well potential starting from a two-mode Bose-Hubbard Hamiltonian. We focus on the small tunneling amplitude regime and apply perturbation theory up to second order. Analytical expressions for the energy eigenvalues and eigenstates are obtained. Then the quantum evolution of the number difference of bosons between the two potential wells is fully investigated for two different initial conditions: completely localized states and coherent spin states. In the first case both the short and the long time dynamics is studied and a rich behaviour is found, ranging from small amplitude oscillations and collapses and revivals to coherent tunneling. In the second case the short-time scale evolution of number difference is determined and a more irregular dynamics is evidenced. Finally, the formation of Schroedinger cat states is considered and shown to affect the momentum distribution.Comment: 14 pages, 4 figure

Survival of indigenous and non-Indigenous Queenslanders after a diagnosis of lung cancer: a matched cohort study

Objective: To compare survival of Indigenous and non-Indigenous lung cancer patients and to investigate any corresponding differences in stage, treatment and comorbidities.Design and setting: Cohort study of 158 Indigenous and 152 non-Indigenous patients (frequency-matched on age, sex and rurality) diagnosed with lung cancer between 1996 and 2002 and treated in Queensland public hospitals.Main outcome measures: Survival after diagnosis of lung cancer; effects of stage at diagnosis, treatment, comorbidities and histological subtype on lung cancer-specific survival.Results: Survival of Indigenous lung cancer patients was significantly lower than that of non-Indigenous patients (median survival, 4.3 v 10.3 months; hazard ratio, 1.48; 95% CI, 1.14&ndash;1.92). Of 158 Indigenous patients, 72 (46%) received active treatment with chemotherapy, radiotherapy or surgery compared with 109 (72%) of the 152 non-Indigenous patients, and this treatment disparity remained after adjusting for histological subtype, stage at diagnosis, and comorbidities (adjusted risk ratio, 0.65; 95% CI, 0.53&ndash;0.73). The treatment disparity explained most of the survival deficit: the hazard ratio reduced to 1.10 (95% CI, 0.83&ndash;1.44) after inclusion of treatment variables in the proportional hazards survival model. The remaining survival deficit was explained by the higher prevalence of comorbidities among Indigenous cancer patients, mainly diabetes.Conclusion: Survival after a diagnosis of lung cancer is worse for Indigenous patients than for non-Indigenous patients, and differences in treatment between the two groups are mainly responsible

Associations between experiences of disrupted attachments and suicidal thoughts and behaviours: an interpretative phenomenological analysis

Suicide is a major public health concern and itsaetiology is complex. Evidence suggests that experiences of early disrupted attachment relationships with parents and family members are associated with later experiences of suicidal thoughts and behaviours (STB). However, no study has investigated this relationship from an inductive, interpretative and idiographic perspective. Objective: This paper explores the role of interpersonal relationships in STB among nine individuals who have attempted suicide. Method: Semi-structured face-to-face interviews were analysed using an interpretative phenomenological analysis approach. Results and conclusion: Two inter-related master themes were identified: 1) ‘challenging relationships as catalysts for STB’; and 2) ‘positive relationships as buffers against STB’. Findings indicate that experiences of early disrupted parent-child attachments may contribute to vulnerability for STB by shaping participants' perceptions of intimate others and themselves (internal working models). These working models, along with other environmental factors and life events, may increase the risk of STB through perceptions of defeat, entrapment, perceived burdensomeness and thwarted belongingness. Results also suggest that being exposed to respectful, caring, unconditionally accepting, reciprocal, trusting, and non-judgemental intimate adult relationships increase resilience and is associated with recovery from past STB and a reduction of current suicide risk. The theoretical and clinical implications are discussed