Quantum Phase Slips in one-dimensional Josephson Junction Chains

We have studied quantum phase-slip (QPS) phenomena in long one-dimensional Josephson junction series arrays with tunable Josephson coupling. These chains were fabricated with as many as 2888 junctions, where one sample had a tunable weak link in the middle. Measurements were made of the zero-bias resistance, $R_0$, as well as current-voltage characteristics (IVC). The finite $R_0$ is explained by QPS and shows an exponential dependence on $\sqrt{E_J/E_C}$ with a distinct change in the exponent at $R_0=R_Q=h/4e^2$. When $R_0 > R_Q$ the IVC clearly shows a remnant of the Coulomb blockade, which evolves to a zero-current state with a sharp critical voltage as $E_J$ is tuned to a smaller value. The zero-current state below the critical voltage is due to coherent QPS and we show that these are enhanced at the central weak link. Above the critical voltage a negative differential resistance is observed which nearly restores the zero-current state

Structural properties of laminated Douglas fir/epoxy composite material

This publication contains a compilation of static and fatigue strength data for laminated-wood material made from Douglas fir and epoxy. Results of tests conducted by several organizations are correlated to provide insight into the effects of variables such as moisture, size, lamina-to-lamina joint design, wood veneer grade, and the ratio of cyclic stress to steady stress during fatigue testing. These test data were originally obtained during development of wood rotor blades for large-scale wind turbines of the horizontal-axis (propeller) configuration. Most of the strength property data in this compilation are not found in the published literature. Test sections ranged from round cylinders 2.25 in. in diameter to rectangular slabs 6 by 24 in. in cross section and approximately 30 ft. long. All specimens were made from Douglas fir veneers 0.10 in. thick, bonded together with the WEST epoxy system developed for fabrication and repair of wood boats. Loading was usually parallel to the grain. Size effects (reduction in strength with increase in test volume) are observed in some of the test data, and a simple mathematical model is presented that includes the probability of failure. General characteristics of the wood/epoxy laminate are discussed, including features that make it useful for a wide variety of applications

Hyper-Rayleigh scattering in centrosymmetric systems

Hyper-Rayleigh scattering (HRS) is an incoherent mechanism for optical second harmonic generation. The frequency-doubled light that emerges from this mechanism is not emitted in a laser-like manner, in the forward direction; it is scattered in all directions. The underlying theory for this effect involves terms that are quadratic in the incident field and involves an even-order optical susceptibility (for a molecule, its associated hyperpolarizability). In consequence, HRS is often regarded as formally forbidden in centrosymmetric media. However, for the fundamental three-photon interaction, theory based on the standard electric dipole approximation, representable as E13, does not account for all experimental observations. The relevant results emerge upon extending the theory to include E12M1 and E12E2 contributions, incorporating one magnetic dipolar or electric quadrupolar interaction, respectively, to a consistent level of multipolar expansion. Both additional interactions require the deployment of higher orders in the multipole expansion, with the E12E2 interaction analogous in rank and parity to a four-wave susceptibility. To elicit the correct form of response from fluid or disordered media invites a tensor representation which does not oversimplify the molecular components, yet which can produce results to facilitate the interpretation of experimental observations. The detailed derivation in this work leads to results which are summarized for the following: perpendicular detection of polarization components both parallel and perpendicular to the pump radiation, leading to distinct polarization ratio results, as well as a reversal ratio for forward scattered circular polarizations. The results provide a route to handling data with direct physical interpretation, to enable the more sophisticated design of molecules with sought nonlinear optical properties

Phase I Archaeological Intensive Survey of Hassanamesitt Woods Property, Grafton, Massachusetts

The Center for Cultural and Environmental History conducted a Phase I archaeological intensive survey of the Hassanamesitt Woods property in Grafton, Massachusetts from October 2004 through January 2005. Documentary evidence has suggested that the property may contain remains of the church for the Praying Indian village of Hassanamisco, established by John Eliot in 1660. Historical deed research has also placed several Nipmuc families on the property in the early 18th century, suggesting the area was resettled by the original inhabitants of Hassanimisco in the aftermath of King Philip\u27s War. Throughout the course of the 18th and 19th centuries the property was subsequently parceled out for agricultural purposes to white landowners. Nipmuc presence on the property however endured until the end of the 19th century. During the 20th century the property was utilized predominantly for orchards before reverting to its current state of woodland. The survey of the 203+ acre property on the southern slope of Keith Hill consisted of shovel testing and a GPS survey of above ground features in order to identify historic and prehistoric resources and make recommendations for the future management of the property. A total of 386 test pits were excavated on 10m and 20m intervals covering approximately 74 acres and identifying six historic sites and one prehistoric site. The prehistoric site is composed of a well-defined lithic quarry, while the historic sites consist of the remains of 18th, 19th, and 20th century residential, agricultural, and low level industrial activities. The highest concentration of residential material has been identified as the remains of 18th and 19th century Nipmuc settlement. No 17th century component related to John Eliot\u27s church or meeting house was recovered. Several aboveground features were located, including cellar holes, wens, extensive stone walls, stone retaining walls, and cobbled terraces. Because the property is not slated for large-scale development it is recommended that no further immediate archaeological testing is needed. However, the archaeological remains related to 18th and 19th century Nipmuc settlement offer an opportunity to investigate Native American resettlement after the abandonment of Hassanamisco. Future archaeology may also help with public interpretation of the property within the context of long term land use from the Prehistoric Archaic period through the Early Modem period. Data gathered during this Phase I survey provides a starting point for the public interpretation of the Hassanamesitt Woods property and allows for the proper management of the property in terms of trail placement and low impact construction

Evaluating the climate effects of mid-1800s deforestation in New England, USA, using a Weather, Research, and Forecasting (WRF) Model Multi-Physics Ensemble

The New England region of the northeastern United States has a land use history characterized by forest clearing for agriculture and other uses during European colonization and subsequent reforestation following widespread farm abandonment. Despite these broad changes, the potential influence on local and regional climate has received relatively little attention. This study investigated wintertime (December through March) climate impacts of reforestation in New England using a high-resolution (4 km) multiphysics ensemble of the Weather Research and Forecasting Model. In general, the conversion from mid-1800s cropland/grassland to forest led to warming, but results were sensitive to physics parameterizations. The 2-m maximum temperature (T2max) was most sensitive to choice of land surface model, 2-m minimum temperature (T2min) was sensitive to radiation scheme, and all ensemble members simulated precipitation poorly. Reforestation experiments suggest that conversion of mid-1800s cropland/grassland to present-day forest warmed T2max +0.5 to +3 K, with weaker warming during a warm, dry winter compared to a cold, snowy winter. Warmer T2max over forests was primarily the result of increased absorbed shortwave radiation and increased sensible heat flux compared to cropland/grassland. At night, T2min warmed +0.2 to +1.5 K where deciduous broadleaf forest replaced cropland/grassland, a result of decreased ground heat flux. By contrast, T2min of evergreen needleleaf forest cooled –0.5 to –2.1 K, primarily owing to increased ground heat flux and decreased sensible heat flux

Post mortem studies of sea otters, Enhydra lutris L., in California

Dead sea otters found on or near beaches in central California from January 1968 through June 1974 were collected for study. Necropsies were conducted on many of these carcasses. Sea otter mortalities are related to: (1) area of recovery; (2) sex; (3) relative age; (4) general cause of death; and (5) sea surface roughness. Selected specific aspects of necropsies are summarized. Tables for estimating weight from total length and estimating total length from tail length and foot length are given. Organ weights are discussed. Criteria for establishing relative age based on degree of fusion of cranial sutures, eruption and wear of dentition, and development of the glenoid fossa are given. A method of estimating relative age of male otters is given based on baculum length or volume. Methods useful for sexing dissociated skeletal remains based on osteological differences in pelves are presented. (87pp.

Rural Pennsylvania Underemployment And Its Determinants

This paper investigates the impact of age distribution and educational attainment on the level of underemployment in Appalachian regions of the United States.  Furthermore, this study shows the similarities and differences at the state and county levels for Pennsylvania.  Following the methodology of Price and Wail (2005) linear regression models are used to estimate the marginal impacts of general economic conditions measured by the unemployment rate, as well as age and educational attainment, on the level of underemployment in the state.  In rural Appalachia, younger workers and those with some post-baccalaureate education are more likely to find themselves underemployed.  Keywords: rural economics, Appalachian studies, unemployment, underemployment, measurement issues