How Yoopers see the future of their communities: why residents leave or stay in Michigan\u27s Upper Peninsula

According to a Community and Environment in Rural America survey, Michigan\u27s Upper Peninsula residents, often called Yoopers, said that ties to community and the area\u27s natural beauty were significant factors for those who planned on staying in this rural area, which comprises about a third of Michigan\u27s land mass but only 4 percent of its population. Those planning on leaving cited employment opportunities and energy costs as the most important factors in their decision

Social impact of the Gulf Oil Disaster: diverging views from communities in Florida and Louisiana

Carsey researchers surveyed over two thousand residents of the Gulf Coast following the BP Deepwater Horizon oil rig explosion in 2010 to analyze their perception of the spill. Nearly one-half of all Gulf Coast residents perceived damage to the environment and wildlife as the most serious result of the oil spill. Perceptions regarding the impact of the spill reflect the different relationships to the oil economy in the two states--”Floridians are most concerned about effects on tourism and Louisianans on the fishing and oil industries. Louisianans were more than twice as likely as Floridians to think that their state and local governments were doing an excellent job responding to the spill, though this does not account for differences in government responses. Approximately three-fourths of Gulf Coast residents thought that the federal government was doing a poor or fair job responding. The most trusted source of information about the spill for all respondents was scientists. Environmental organizations were the second most trusted source. Network TV news, BP, and websites or blogs were the least trusted sources of information. This brief examines the impact of the spill on Gulf Coast residents and provides important insights that can inform disaster relief efforts in the future to better meet the needs of those affected

Southeastern Kentuckians remain optimistic through Great Recession: growing concerns about sprawl, housing, and recreational opportunities

In May and June of 2007, Carsey Institute researchers surveyed 1,000 randomly selected respondents from Kentucky’s Harlan and Letcher counties, and between November 2010 and January 2011, they returned to survey 1,020 different randomly selected respondents from the same counties. These two Kentucky counties provide a snapshot of perceptions of community and environmental change in a chronically poor rural place. This brief focuses on the questions asked in both surveys to identify area wide (Harlan and Letcher counties combined) changes since the Great Recession. The surveys reveal that the recession has exacerbated concern about many community-level problems including poverty, affordable housing, sprawl, and a lack of recreational opportunities. Southeastern Kentuckians’ views regarding how environmental resources should be used have also changed. As the demand for jobs has increased, Harlan and Letcher county residents are more likely to believe that natural resources should be used for economic development rather than conserved for the future. Optimism about the future is unchanged despite growing financial instability during the recession

Education in chronically poor rural areas lags across generations

As part of the Community and Environment in Rural America (CERA) initiative, the Carsey Institute has been investigating broad trends between rural community types, including the education level of residents and their parents. Since 2007, Carsey researchers have conducted over 17,000 telephone surveys with randomly selected adult Americans from twelve diverse rural locations to ask about both their own and their parents’ educational attainment, as well as their perceptions of school quality in their communities. Survey results conclude that educational achievement varies significantly by type of place in rural America. In chronically poor rural areas, 45 percent of residents have completed only high school or less, compared with 22 to 33 percent in amenity-rich, amenity-transition, and declining resource-dependent rural areas. Although people from all types of rural communities generally have more education than their parents, those in chronically poor rural areas still have relatively low education levels — a disadvantage that persists across generations. This brief highlights the need to invest in the educational systems of chronically poor rural areas where generations of underinvestment have contributed to persistent poverty

Recursive algorithm for arrays of generalized Bessel functions: Numerical access to Dirac-Volkov solutions

In the relativistic and the nonrelativistic theoretical treatment of moderate and high-power laser-matter interaction, the generalized Bessel function occurs naturally when a Schr\"odinger-Volkov and Dirac-Volkov solution is expanded into plane waves. For the evaluation of cross sections of quantum electrodynamic processes in a linearly polarized laser field, it is often necessary to evaluate large arrays of generalized Bessel functions, of arbitrary index but with fixed arguments. We show that the generalized Bessel function can be evaluated, in a numerically stable way, by utilizing a recurrence relation and a normalization condition only, without having to compute any initial value. We demonstrate the utility of the method by illustrating the quantum-classical correspondence of the Dirac-Volkov solutions via numerical calculations.Comment: 14 pages, 5 figure

Neutrino Pair Cerenkov Radiation for Tachyonic Neutrinos

The emission of a charged light lepton pair by a superluminal neutrino has been identified as a major factor in the energy loss of highly energetic neutrinos. The observation of PeV neutrinos by IceCube implies their stability against lepton pair Cerenkov radiation. Under the assumption of a Lorentz-violating dispersion relation for highly energetic superluminal neutrinos, one may thus constrain the Lorentz-violating parameters. A kinematically different situation arises when one assumes a Lorentz-covariant, space-like dispersion relation for hypothetical tachyonic neutrinos, as an alternative to Lorentz-violating theories. We here discuss a hitherto neglected decay process, where a highly energetic tachyonic neutrinos may emit other (space-like, tachyonic) neutrino pairs. We find that the space-like dispersion relation implies the absence of a q^2 threshold for the production of a tachyonic neutrino-antineutrino pair, thus leading to the dominant additional energy loss mechanism for an oncoming tachyonic neutrino in the medium-energy domain. Surprisingly, the small absolute value of the decay rate and energy loss rate in the tachyonic model imply that these models, in contrast to the Lorentz-violating theories, are not pressured by the cosmic PeV neutrinos registered by the IceCube collaboration.Comment: 7 pages; RevTeX; accepted for publication for Advances in High Energy Physic

Relativistic calculation of the two-photon decay rate of highly-excited ionic states

Based on quantum electrodynamics, we reexamine the two-photon decay of one-electron atoms. Special attention is paid to the calculation of the (two-photon) total decay rates which can be viewed as the imaginary part of the two-loop self-energy. We argue that our approach can easily be applied to the cases with a virtual state having an intermediate energy between the initial and the final state of the decay process leading, thus, to the resonance peaks in the two-photon energy distribution. In order to illustrate our approach, we obtain fully relativistic results, resolved into electric and magnetic multipole components, for the two-photon decay rates of the 3S_{1/2} -> 1S_{1/2} transition in neutral hydrogen as well as in various hydrogen-like ions.Comment: 11 pages, LaTe

Calculation of Hydrogenic Bethe Logarithms for Rydberg States

We describe the calculation of hydrogenic (one-loop) Bethe logarithms for all states with principal quantum numbers n <= 200. While, in principle, the calculation of the Bethe logarithm is a rather easy computational problem involving only the nonrelativistic (Schroedinger) theory of the hydrogen atom, certain calculational difficulties affect highly excited states, and in particular states for which the principal quantum number is much larger than the orbital angular momentum quantum number. Two evaluation methods are contrasted. One of these is based on the calculation of the principal value of a specific integral over a virtual photon energy. The other method relies directly on the spectral representation of the Schroedinger-Coulomb propagator. Selected numerical results are presented. The full set of values is available at quant-ph/0504002.Comment: 10 pages, RevTe

Non-uniform convergence of two-photon decay rates for excited atomic states

Two-photon decay rates in simple atoms such as hydrogenlike systems represent rather interesting fundamental problems in atomic physics. The sum of the energies of the two emitted photons has to fulfill an energy conservation condition, the decay takes place via intermediate virtual states, and the total decay rate is obtained after an integration over the energy of one of the emitted photons. Here, we investigate cases with a virtual state having an energy intermediate between the initial and the final state of the decay process, and we show that due to non-uniform convergence, only a careful treatment of the singularities infinitesimally displaced from the photon integration contour leads to consistent and convergent results.Comment: 3 pages; LaTe

IR-transmission glasses formed from oxides of bismuth and tellurium

Bismuth trioxide-tellurium dioxide glasses have improved infrared transmission characteristics