Space and Time in Macroeconomic Panel Data: Young Workers and State-Level Unemployment Revisited

A provocative paper by Shimer (2001) finds that state-level youth shares and unemployment rates are negatively correlated, in contrast to conventional assumptions about demographic effects on labor markets. This paper updates Shimer's regressions and shows that this surprising correlation essentially disappears when the end of the sample period is extended from 1996 to 2005. This shift does not occur because of a change in the underlying economy during the past decade. Rather, the presence of a cross-sectional (that is, spatial) correlation in the state-level data sharply reduces the precision of the earlier estimates, so that the true standard errors are several times larger than those originally reported. Using a longer sample period and some controls for spatial correlation in the regression, point estimates for the youth-share effect on unemployment are positive and close to what a conventional model would imply. Unfortunately, the standard errors remain very large. The difficulty of obtaining precise estimates with these data illustrates a potential pitfall in the use of regional panel data for macroeconomic analysis

The Long-Baseline Neutrino Experiment: Exploring Fundamental Symmetries of the Universe

The preponderance of matter over antimatter in the early Universe, the dynamics of the supernova bursts that produced the heavy elements necessary for life and whether protons eventually decay --- these mysteries at the forefront of particle physics and astrophysics are key to understanding the early evolution of our Universe, its current state and its eventual fate. The Long-Baseline Neutrino Experiment (LBNE) represents an extensively developed plan for a world-class experiment dedicated to addressing these questions. LBNE is conceived around three central components: (1) a new, high-intensity neutrino source generated from a megawatt-class proton accelerator at Fermi National Accelerator Laboratory, (2) a near neutrino detector just downstream of the source, and (3) a massive liquid argon time-projection chamber deployed as a far detector deep underground at the Sanford Underground Research Facility. This facility, located at the site of the former Homestake Mine in Lead, South Dakota, is approximately 1,300 km from the neutrino source at Fermilab -- a distance (baseline) that delivers optimal sensitivity to neutrino charge-parity symmetry violation and mass ordering effects. This ambitious yet cost-effective design incorporates scalability and flexibility and can accommodate a variety of upgrades and contributions. With its exceptional combination of experimental configuration, technical capabilities, and potential for transformative discoveries, LBNE promises to be a vital facility for the field of particle physics worldwide, providing physicists from around the globe with opportunities to collaborate in a twenty to thirty year program of exciting science. In this document we provide a comprehensive overview of LBNE's scientific objectives, its place in the landscape of neutrino physics worldwide, the technologies it will incorporate and the capabilities it will possess.Comment: Major update of previous version. This is the reference document for LBNE science program and current status. Chapters 1, 3, and 9 provide a comprehensive overview of LBNE's scientific objectives, its place in the landscape of neutrino physics worldwide, the technologies it will incorporate and the capabilities it will possess. 288 pages, 116 figure

On the Market Discipline of Informationally-Opaque Firms: Evidence from Bank Borrowers in the Federal Funds Market

Using plausibly exogenous variation in demand for federal funds created by daily shocks to reserve balances, we identify the supply curve facing a bank borrower in the interbank market and study how access to overnight credit is affected by changes in public and private measures of borrower creditworthiness. Although there is evidence that lenders respond to adverse changes in public information about credit quality by restricting access to the market in a fashion consistent with market discipline, there is also evidence that borrowers respond to adverse changes in private information about credit quality by increasing leverage so as to offset the future impact on earnings. While the responsiveness of investors to public information is comforting, we document evidence that suggests that banks are able to manage the real information content of these disclosures. In particular, public measures of loan portfolio performance have information about future loan charge-offs, but only in quarters when the bank is examined by supervisors. However, the loan supply curve is not any more sensitive to public disclosures about nonperforming loans in an exam quarter, suggesting that investors are unaware of this information management

Report from the Annual Conference of the British Society of Echocardiography, November 2017, Edinburgh International Conference Centre, Edinburgh

No abstract available

Autonomous navigation with taxiway crossings identification using camera vision and airport map

With increasing demands of unmanned aerial vehicle (UAV) operations envisioned for the future of aviation, the number of pilots will be much lower than the number of drones, necessitating an increased level of autonomy in drones to alleviate workload. Autonomous UAV taxiing enables autonomy to move on the ground, specifically from the gate to the runway and vice versa without human intervention. This study presents a lightweight vision-based autonomous taxiway navigation system, exploring the fusion of camera vision feed under the nose and airport map data to offer guidance and navigation. A sliding window mechanism is applied in centreline identification to detect line divergence. Centreline representations including divergence, direction and heading are cross-referenced with the airport database for localisation and generating navigation solutions. A simple proportional integral derivative (PID) controller is developed over aircraft dynamic models aligned with Eagle Dynamic’s Digital Combat Simulator to demonstrate the centreline following function. The overall system performance is assessed through simulations, encompassing individual functionality performance tests including centreline extraction test, line matching test, line-to-follow test, generalisation capability test, and computational complexity test. The performance evaluations indicate the promising potential of camera visions in enabling autonomous UAV taxiing with a 71% successful rate of detecting correct lines to follow and the remaining 29% as background. The proposed system also suggests a high generalization capability of more than a 67% success rate when testing over other paths. The source code of this proposition is open-sourced at https://github.com/DelQuentin/TaxiEye

Palaeolimnological study of the Macquarie Marshes, Australia: evidence of channel movement during the Holocene based on algae (Charophytes, diatoms), macrophytes and invertebrates

2 page(s

Tensions in informed self-assessment: how the desire for feedback and reticence to collect and use it can conflict.

Item does not contain fulltextPURPOSE: Informed self-assessment describes the set of processes through which individuals use external and internal data to generate an appraisal of their own abilities. The purpose of this project was to explore the tensions described by learners and professionals when informing their self-assessments of clinical performance. METHOD: This 2008 qualitative study was guided by principles of grounded theory. Eight programs in five countries across undergraduate, postgraduate, and continuing medical education were purposively sampled. Seventeen focus groups were held (134 participants). Detailed analyses were conducted iteratively to understand themes and relationships. RESULTS: Participants experienced multiple tensions in informed self-assessment. Three categories of tensions emerged: within people (e.g., wanting feedback, yet fearing disconfirming feedback), between people (e.g., providing genuine feedback yet wanting to preserve relationships), and in the learning/practice environment (e.g., engaging in authentic self-assessment activities versus "playing the evaluation game"). Tensions were ongoing, contextual, and dynamic; they prevailed across participant groups, infusing all components of informed self-assessment. They also were present in varied contexts and at all levels of learners and practicing physicians. CONCLUSIONS: Multiple tensions, requiring ongoing negotiation and renegotiation, are inherent in informed self-assessment. Tensions are both intraindividual and interindividual and they are culturally situated, reflecting both professional and institutional influences. Social learning theories (social cognitive theory) and sociocultural theories of learning (situated learning and communities of practice) may inform our understanding and interpretation of the study findings. The findings suggest that educational interventions should be directed at individual, collective, and institutional cultural levels. Implications for practice are presented.1 september 201