A heterogeneous-agent model with district-level constraints: an application to livestock development in Gansu, China

This paper develops a heterogeneous-agent model to assess the impacts of removing lucerne growing subsidies, increasing livestock numbers and including district-level equilibrium conditions on optimal farm plans in the Qingyang district of Gansu Province, China. The model is a five-year dynamic linear program that solves across 96 farm households whilst incorporating district-level constraints. The approach used allows us to observe seasonal variations in incomes, infer the distribution of a policy shock among households and highlight trade patterns at the district level. The results suggest that without lucerne growing subsidies the total area of lucerne grown by all modelled households falls by 18%. Increasing livestock numbers by 25% reduces net household incomes by 17% as changes to labour allocations reduce off-farm employment opportunities. When external trade in forages is included in the model, total livestock numbers held by all 96 households rise from 502 to 838, this highlights the benefits of integrated feed markets. Shadow prices for crop production rise when livestock numbers increase, implying that benefits exist to improving crop yields.Heterogeneous-agent model, district-level constraints, livestock, China., Farm Management,

Thermal derivation of the Coleman-De Luccia tunneling prescription

We derive the rate for transitions between de Sitter vacua by treating the field theory on the static patch as a thermal system. This reproduces the Coleman-De Luccia formalism for calculating the rate, but leads to a modified interpretation of the bounce solution and a different prediction for the evolution of the system after tunneling. The bounce is seen to correspond to a sequence of configurations interpolating between initial and final configurations on either side of the tunneling barrier, all of which are restricted to the static patch. The final configuration, which gives the initial data on the static patch for evolution after tunneling, is obtained from one half of a slice through the center of the bounce, while the other half gives the configuration before tunneling. The formalism makes no statement about the fields beyond the horizon. This approach resolves several puzzling aspects and interpretational issues concerning the Coleman-De Luccia and Hawking-Moss bounces. We work in the limit where the back reaction of matter on metric can be ignored, but argue that the qualitative aspects remain in the more general case. The extension to tunneling between anti-de Sitter vacua is discussed.Comment: 28 pages, 5 figures; minor rephrasing, typos correcte

Complexity, action, and black holes

Our earlier paper "Complexity Equals Action" conjectured that the quantum computational complexity of a holographic state is given by the classical action of a region in the bulk (the "Wheeler-DeWitt" patch). We provide calculations for the results quoted in that paper, explain how it fits into a broader (tensor) network of ideas, and elaborate on the hypothesis that black holes are the fastest computers in nature.Comment: 55+14 pages, many figures. v2: (so many) typos fixed, references adde

Draft Genome Sequence for Desulfovibrio africanus Strain PCS.

Desulfovibrio africanus strain PCS is an anaerobic sulfate-reducing bacterium (SRB) isolated from sediment from Paleta Creek, San Diego, CA. Strain PCS is capable of reducing metals such as Fe(III) and Cr(VI), has a cell cycle, and is predicted to produce methylmercury. We present the D. africanus PCS genome sequence

Evaporite karst geohazards in the Delaware Basin, Texas: review of traditional karst studies coupled with geophysical and remote sensing characterization

Evaporite karst throughout the Gypsum Plain of west Texas is complex and extensive, including manifestations ranging from intrastratal brecciation and hypogene caves to epigene features and suffosion caves. Recent advances in hydrocarbon exploration and extraction has resulted in increased infrastructure development and utilization in the area; as a result, delineation and characterization of potential karst geohazards throughout the region have become a greater concern. While traditional karst surveys are essential for delineating the subsurface extent and morphology of individual caves for speleogenetic interpretation, these methods tend to underestimate the total extent of karst development and require surficial manifestation of karst phenomena. Therefore, this study utilizes a composite suite of remote sensing and traditional field studies for improved karst delineation and detection of potential karst geohazards within gypsum karst. Color InfraRed (CIR) imagery were utilized for delineation of lineaments associated with fractures, while Normalized Density Vegetation Index (NDVI) analyses were used to delineate regions of increased moisture flux and probable zones of shallow karst development. Digital Elevation Models (DEM) constructed from high-resolution LiDAR (Light Detection and Ranging) data were used to spatially interpret sinkholes, while analyses of LiDAR intensity data were used in a novel way to categorize local variations in surface geology. Resistivity data, including both direct current (DC) and capacitively coupled (CC) resistivity analyses, were acquired and interpreted throughout the study area to delineate potential shallow karst geohazards specifically associated with roadways of geohazard concern; however, detailed knowledge of the surrounding geology and local karst development proved essential for proper interpretation of resistivity inversions. The composite suite of traditional field investigations and remotely sensed karst delineations used in this study illustrate how complex gypsum karst terrains can be characterized with greater detail through the utilization of rapidly advancing technologies, especially in arid environments with low vegetation densities

Modeling of the hydrogen Lyman lines in solar flares

The hydrogen Lyman lines (91.2 nm < λ < 121.6 nm) are significant contributors to the radiative losses of the solar chromosphere, and they are enhanced during flares. We have shown previously that the Lyman lines observed by the Extreme Ultraviolet Variability instrument onboard the Solar Dynamics Observatory exhibit Doppler motions equivalent to speeds on the order of 30 km s−1. However, contrary to expectations, both redshifts and blueshifts were present and no dominant flow direction was observed. To understand the formation of the Lyman lines, particularly their Doppler motions, we have used the radiative hydrodynamic code, RADYN, along with the radiative transfer code, RH, to simulate the evolution of the flaring chromosphere and the response of the Lyman lines during solar flares. We find that upflows in the simulated atmospheres lead to blueshifts in the line cores, which exhibit central reversals. We then model the effects of the instrument on the profiles, using the Extreme Ultraviolet Variability Experiment (EVE) instrument's properties. What may be interpreted as downflows (redshifted emission) in the lines, after they have been convolved with the instrumental line profile, may not necessarily correspond to actual downflows. Dynamic features in the atmosphere can introduce complex features in the line profiles that will not be detected by instruments with the spectral resolution of EVE, but which leave more of a signature at the resolution of the Spectral Investigation of the Coronal Environment instrument onboard the Solar Orbiter

Characteristics of patients transported by an air ambulance critical care team

Background: The aim of this study was to review patients conveyed by the Great Western Air Ambulance to its main receiving hospital. Methods: Retrospective data were collected for all patients transferred to Frenchay Hospital by the Great Western Air Ambulance between 1 June 2008 and 1 March 2010. Results: 115 patients were included in the review. Patients were conveyed up to 85 km, 79% bypassing the closest emergency department (ED). 51% of these patients had major trauma and 35% were intubated at the scene. On arrival, the mean time to CT scan was 78 min, reduced to 63 min for those with a head injury. 16% of patients were discharged from the ED. Conclusions: This review provides an overview of the characteristics of patients transferred to a major receiving hospital by a prehospital critical care team

Brief of \u3cem\u3eAmici Curiae\u3c/em\u3e Financial Regulation Scholars in \u3cem\u3eSeila Law LLC v. Consumer Financial Protection Bureau\u3c/em\u3e

Peter Conti-Brown, Adam Levitin, and Patricia McCoy—three leading scholars of financial regulation—submitted this brief to the Supreme Court of the United States for the case Seila Law LLC v. Consumer Financial Protection Bureau to lend their expertise on the history and purpose of the Consumer Financial Protection Bureau’s structure. They take no position on the question of severability, but argue that, should the Court not dismiss the case, there are two alternatives that will respect Congress’s constitutional role as the legislative designer of federal administration. First, it can acknowledge that the many accountability-enhancing mechanisms that Congress attached to the CFPB bring it well within the constitutional mainstream and affirm the circuit court’s opinion. Second, it can remand the case for further review of these accountability-enhancing mechanisms. A holistic review of the CFPB’s structure will reveal the constitutional logic of Congress’s design. That record is not currently before the Court, and a remand would permit further review of these design features. What the Court should not do is accept Petitioner’s invitation to depart from the judicial lane and usurp Congress’s constitutional authority

Enhancing the tax system to halt the decline of nature in New Zealand

New Zealand is world-renowned for its nature – its lush forests, spectacular mountain landscapes, wild and scenic rivers, beautiful coastlines and extraordinary biodiversity.  This natural heritage is the foundation of New Zealand’s identity and its branding, and the premier attraction for the tourism industry. It provides habitable environments, contributes to economic production and assimilates wastes, and is an important source of great enjoyment, health and well-being (Roberts et al., 2015). Nature contributes to the success of the nation’s fishing, farming, forestry and tourism industries, which provide about 52% of national export income (Ministry of Business, Innovation and Employment, 2013). But these values and the well-being and prosperity they enable are being diminished and degraded  at an alarming rate.&nbsp