Primary arm spacing in chill block melt spun Ni-Mo alloys

Chill block melt spun ribbons of Ni-Mo binary alloys containing 8.0 to 41.8 wt % Mo have been prepared under carefully controlled processing conditions. The growth velocity has been determined as a function of distance from the quench surface from the observed ribbon thickness dependence on the melt puddle residence time. Primary arm spacings measured at the midribbon thickness locations show a dependence on growth velocity and alloy composition which is expected from dendritic growth models for binary alloys directionally solidified in a positive temperature gradient

Angle-resolved photoemission spectra in the cuprates from the d-density wave theory

Angle-resolved photoemission spectra present two challenges for the d-density wave (DDW) theory of the pseudogap state of the cuprates: (1) hole pockets near $(\pi/2,\pi/2)$ are not observed, in apparent contradiction with the assumption of translational symmetry breaking, and (2) there are no well-defined quasiparticles at the {\it antinodal} points, in contradiction with the predictions of mean-field theory of this broken symmetry state. Here, we show how these puzzles can be resolved.Comment: 4 pages, 3 eps figures, RevTex

Multi-year Water Allocation: A Policy Analysis for Groundwater Management and Conservation for Irrigated Agriculture

Heavy withdrawals from the most dependable source of groundwater in the Texas Panhandle, the Ogallala Aquifer, create an impending need for implementing water conservation policies. This study evaluates the policy option of multi-year water allocation coupled with water use restriction in four water deficit counties of Castro, Deafsmith, Parmer and Swisher over a sixty year planning horizon. Results indicate that the water use in the study area declines with progressive restriction rates accompanied by a substantial decrease in the net present value of net returns over sixty years and therefore it is important to analyze the socio-economic effects of implementing such a policy alternative.Multi-year allocation, Ogallala Aquifer, Texas Panhandle, Water conservation, Environmental Economics and Policy, Farm Management, Resource /Energy Economics and Policy,

Dissipate locally, couple globally: a sharp transition from decoupling to infinite range coupling in Josephson arrays with on-site dissipation

We study the T=0 normal to superconducting transition of Josephson arrays with {\it on-site} dissipation. A perturbative renormalization group solution is given. Like the previously studied case of {\it bond} dissipation (BD), this is a "floating" to coupled (FC) phase transition. {\it Unlike} the BD transition, at which {\it only} nearest-neighbor couplings become relevant, here {\it all} inter-grain couplings, out to {\it infinitely} large distances, do so simultaneously. We predict, for the first time in an FC transition, a diverging spatial correlation length. Our results show the robustness of floating phases in dissipative quantum systems.Comment: 7+ pages, 3 eps figures, Europhysics Letters preprint format, as publishe

Microstructures in rapidly solidified Ni-Mo alloys

Ni-Mo alloys of compositions ranging from pure Ni to Ni-40 at % Mo were rapidly solidified by Chill Block Melt Spinning in vacuum and were examined by optical metallography, X-ray diffraction and transmission electron microscopy. Rapid solidification resulted in an extension of molybdenum solubility in nickel from 28 to 37.5 at %. A number of different phases and microstructures were seen at different depths (solidification conditions) from the quenched surface of the melt spun ribbons

Long Term Effects of Experience During Youth: Evidence From Consumptions in China

We test for the long-term effects of experience during youth on consumption in nontraditional taste-forming categories. A unique dataset that tracks individuals over twenty years from 1992-2011, residing in nine Chinese provinces that vary widely in both income levels and rate of economic growth, helps us identify cohort and intra-cohort “prosperity-inyouth” (PIY) effects on consumption. We first demonstrate that non-traditional category consumption increases strongly among cohorts that entered adulthood during China’s boom years. We then show evidence of the intra-cohort PIY effect, controlling for individual level experience by leveraging the heterogeneity in the timing and rate of growth in prosperity across Chinese provinces. We find that the PIY effect has two dimensions– a direct effect of one’s own prosperity and an indirect effect of the prosperity of one’s province during youth. The indirect effects suggest that norms and aspirations created by the consumption of nontraditional categories by the surrounding rich during one’s youth have significant impact on long-term consumption—almost the same magnitude as the direct effect. We conduct a large number of robustness checks; in particular, we rule out potential supply side and attitude based explanations for the PIY effect. Our results imply that segmentation and consumption forecasts based on birth cohorts and experience of prosperity can be effective for taste forming non-traditional products in emerging markets

Long Term Effects of “Prosperity in Youth” on Consumption: Evidence from China

We test for the long-term impact of experiencing “prosperity in youth” (PIY) on non-traditional category consumption. Using unique twenty-year panel data of individuals from nine Chinese provinces with varying levels of per-capita GDP and rates of per-capita GDP growth, we find robust evidence for the PIY effect. We find both a direct effect of one’s own prosperity and an indirect effect of the prosperity of one’s province during youth on long-term consumption. In particular, the indirect PIY effect is driven more strongly by individuals with low incomes during youth — suggesting that norms and aspirations created by the consumption of non-traditional categories by the rich during one’s youth have significant impact on long-term consumption — almost the same magnitude as the direct effect. The analysis also highlights the importance of separating cohort effects from life cycle effects for taste based products. We highlight the marketing implications for non-traditional categories in emerging markets