NS-branes, source corrected Bianchi identities, and more on backgrounds with non-geometric fluxes

In the first half of the paper, we study in details NS-branes, including the NS5-brane, the Kaluza-Klein monopole and the exotic $5_2^2$- or Q-brane, together with Bianchi identities for NSNS (non)-geometric fluxes. Four-dimensional Bianchi identities are generalized to ten dimensions with non-constant fluxes, and get corrected by a source term in presence of an NS-brane. The latter allows them to reduce to the expected Poisson equation. Without sources, our Bianchi identities are also recovered by squaring a nilpotent $Spin(D,D) \times \mathbb{R}^+$ Dirac operator. Generalized Geometry allows us in addition to express the equations of motion explicitly in terms of fluxes. In the second half, we perform a general analysis of ten-dimensional geometric backgrounds with non-geometric fluxes, in the context of $\beta$-supergravity. We determine a well-defined class of such vacua, that are non-geometric in standard supergravity: they involve $\beta$-transforms, a manifest symmetry of $\beta$-supergravity with isometries. We show as well that these vacua belong to a geometric T-duality orbit.Comment: v2: minor changes and additions, few references added, published versio

Residence-time distributions for chaotic flows in pipes

In this paper we derive two rigorous properties of residence-time distributions for flows in pipes and mixers motivated by computational results of Khakhar et al. [Chem. Eng. Sci. 42, 2909 (1987)], using some concepts from ergodic theory. First, a curious similarity between the isoresidence-time plots and Poincaré maps of the flow observed in Khakhar et al. is resolved. It is shown that in long pipes and mixers, Poincaré maps can serve as a useful guide in the analysis of isoresidence-time plots, but the two are not equivalent. In particular, for long devices isoresidence-time sets are composed of orbits of the Poincaré map, but each isoresidence-time set can be comprised of many orbits. Second, we explain the origin of multimodal residence-time distributions for nondiffusive motion of particles in pipes and mixers. It is shown that chaotic regions in the Poincaré map contribute peaks to the appropriately defined and rescaled axial distribution functions

Late Planting Decisions with Crop Insurance: Decision Guidelines for Michigan Farmers in Spring 2011

Michigan has had unusually wet planting conditions in 2011, leading to substantial acreage that has not been planted at this late date. Farmers who purchased crop insurance have many options available to them. This paper addresses the major crop insurance decisions that farmers will face during the next 30 days.crop insurance, prevented planting, risk management, farm management, corn returns, soybean returns, Agricultural and Food Policy, Crop Production/Industries, Farm Management, Risk and Uncertainty,

Politics of mimicry - politics of exclusion: comparing post-communist civil-military relations in Poland and Hungary, Russia and Ukraine, 1991-1999

The dissertation looks at the transformation of civil-military relations in Poland and Hungary, Russia and Ukraine between the dissolution of the Warsaw Pact in July 1991 and the enlargement of NATO in March 1999. It presents new qualitative data based on approximately 120 elite interviews conducted by the author of politicians, military officers, defence analysts, and journalists in the countries in the study. In general, the focus is on the civilian side of the civil-military equation. Specifically, the work assesses the state of civil-military relations on the basis of three interconnected indicators: the making of security policy and defence reform as a test of civilian control, the role of civilians in the ministry of defence, and the strength of agencies of civilian oversight. It is argued that the differences observed in the state of civil-military relations among the states in the study can be explained by the interaction of three main factors. In Poland and Hungary, the external incentives to establish democratic control of the armed forces reform were positive, while in Russia and Ukraine the impact of external actors - of which NATO was by far the most significant - was negative or ambiguous. The attitude of the political and military elite in Poland and Hungary was more open to the adoption of new norms of civil-military relations than was that of the elite in Russia and Ukraine. And in Poland and Hungary the state of the polity and economy presented a less significant internal constraint on reform. The central finding of the dissertation is that in Poland and Hungary reformers tried - with mixed success - to adopt the forms of democratic civil-military relations as part of their drive to integrate with Western politico-military structures without seeking to understand the logic behind them. The result was a "politics of mimicry", a process of imperfect copying of liberal-democratic norms of civil-military relations which, nonetheless, culminated in these countries being admitted to NATO in 1999. In Ukraine and Russia, by contrast, in a time of profound budgetary exigency, the armed forces were left to solve their own problems absent much civilian control except that exercised infrequently and arbitrarily by the head of state

Driving self-restriction and age: A study of emergency department patients

BACKGROUND: Driving self-restriction is well-documented among older drivers but might also occur among younger drivers. Little is known about the driving patterns of emergency department (ED) patients, who may be a high-risk population for motor vehicle crashes (MVCs). We sought to compare the driving patterns and MVCs of younger and older adult ED patients in order to inform development of injury prevention interventions in EDs. METHODS: We surveyed English-speaking younger adult (age 25–64) and older adult (age ≥65) ED patients, excluding non-drivers and those who were cognitively-impaired or too sick to participate. We compared drivers by age group and used logistic regression with adjustment for driving frequency to examine factors associated with driving self-restriction. RESULTS: Of those eligible, 82% (n = 178) of younger adult and 91% (n = 134) of older adult patients participated; approximately half were women. Similar proportions of younger and older adult patients reported driving everyday/almost everyday (80%) but also self-restricting driving in inclimate weather (48%), heavy traffic (27%), in unfamiliar places (21%), when travelling with passengers (1.6%) or when alone (1.3%). Fewer younger adult than older adult patients avoided driving at night (22% versus 49%) or on highways (6.7% versus 26%). In multivariable logistic regression, factors significantly associated self-imposed driving restriction in ≥1 driving situation were female gender (Odds Ratio [OR] 2.40; 95% CI 1.42-4.05) and ever feeling “confused, nervous or uncomfortable” while driving (OR 1.87; 95% CI 1.03-3.39). There was a non-significant trend for differences in proportions between younger adult (11%) and older adult (6.8%) drivers reporting ≥1 MVC as a driver in the past 12 months. CONCLUSIONS: Similar proportions of younger and older adult ED patients self-restrict driving, albeit in different situations, which has implications for behavioral interventions for injury prevention and for education of patients and medical providers. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s40621-014-0018-z) contains supplementary material, which is available to authorized users