Unified dispersive approach to real and virtual photon-photon scattering at low energy

Previous representations of pion pair production amplitudes by two real photons at low energy, which combine dispersion theoretical constraints with elastic unitariy, chiral symmetry and soft photon constraints are generalized to the case where one photon is virtual. The constructed amplitudes display explicitly the dependence on the $\pi\pi$ phase-shifts, on pion form factors and on pion polarizabilities. They apply both for space-like and time-like virtualities despite the apparent overlap of the left and right-hand cuts, by implementing a definition of resonance exchange amplitudes complying with analyticity and consistent limiting prescriptions for the energy variables. Applications are made to the pion generalized polarizabilies, to vector meson radiative decays, and to the $\sigma\gamma$ electromagnetic form factor. Finally, and evaluation of the contribution of $\gamma\pi\pi$ states in the hadronic vacuum polarization to the muon $g-2$ is given, which should be less model dependent than previous estimates.Comment: 53 pages, 18 figure

The Failure of Private Ordering and the Financial Crisis of 2008

This Article analyzes the Financial Crisis of 2008 in the context of failures by market participants to engage in private ordering thus leading to opportunistic behavior at the expense of market stability. The Financial Crisis of 2008 offers a decidedly negative verdict on a decades-long project to deregulate financial markets and rely on private ordering mechanisms, including securitization and default swaps, to mitigate opportunistic behavior and improve market efficiency. Although the regulatory approach of the past two decades, which relied in great measure on private parties fending for themselves, helped to generate a number of innovations and positive developments in finance, it ultimately failed to bring about more resilient financial markets. The market for mortgage securitizations found itself subject to adverse selection biases leading to a lemons market for asset-backed securities. At the same time, developments in derivative markets made it possible for central actors there to engage in more risk (moral hazard) than was optimal. Ultimately, parties that should have engaged in private ordering did not. As a consequence, we are left struggling for a new regulatory path forward that recognizes that market participants are human agents subject to the frailties of cognitive limitations, euphoria and perhaps even the occasional self-delusion. What is required is a close examination of the institutional and micro incentives (including incentives of agents) in order to strike a balance between market-based regulation and a more interventionist approach to regulating markets. A more pragmatic approach to market regulation recognizes that the earlier hands-off approach to regulation resulted in over-reliance on weak heuristics and little by way of robust private ordering. A new more pragmatic vision of market regulation will likely stop short of legislating against bubbles, but could, and should, result in less systemic risk and a more sustainable growth trajectory going forward

The Role of a General Safety Requirement in Canada's Health Protection Regime

This research was supported in part by a financial contribution from the Health Policy Research Program, Health Canada

LOGIC AND CONSTRAINT PROGRAMMING FOR COMPUTATIONAL SUSTAINABILITY

Computational Sustainability is an interdisciplinary field that aims to develop computational and mathematical models and methods for decision making concerning the management and allocation of resources in order to help solve environmental problems. This thesis deals with a broad spectrum of such problems (energy efficiency, water management, limiting greenhouse gas emissions and fuel consumption) giving a contribution towards their solution by means of Logic Programming (LP) and Constraint Programming (CP), declarative paradigms from Artificial Intelligence of proven solidity. The problems described in this thesis were proposed by experts of the respective domains and tested on the real data instances they provided. The results are encouraging and show the aptness of the chosen methodologies and approaches. The overall aim of this work is twofold: both to address real world problems in order to achieve practical results and to get, from the application of LP and CP technologies to complex scenarios, feedback and directions useful for their improvement

Summer Institute in Space Biology Final report, Apr. 1 - Nov. 30, 1968

Space biology laboratory on effects of aerospace environments on physiological and psychological performance of astronaut

2012 Research Day Abstract Listing

Abstracts of oral and poster presentations from student researchers, presented at UNC\u27s Annual Research Conference during Academic Excellence Week

The Role of Exercise in Polychlorinated Biphenyl Induced Cardiovascular Disease

Cardiovascular disease remains the leading cause of death in Western societies. Endothelial dysfunction is one of the initiating steps in the development of atherosclerosis. While there is a strong correlation with a person’s genetics, lifestyle factors including smoking, physical activity, and diet can significantly increase a person’s susceptibility to the development of atherosclerosis. In addition to these lifestyle factors, there is a strong body of evidence linking exposure to environmental pollutants including persistent organic pollutants such as polychlorinated biphenyls to increased cardiovascular disease and mortality. It has been well-established that exercise protects against cardiovascular disease, but whether exercise can modulate PCB-induced cardiovascular inflammation and dysfunction is unknown. To investigate the effects of exercise on PCB-induced cardiovascular disease, two murine models of atherosclerosis, the ApoE-/- and the LDLr-/- mouse were utilized. Risk factors for cardiovascular disease including adiposity, glucose intolerance, hyperlipidemia, hypertension, oxidative stress, and inflammation, were assessed in these two models as well as mean atherosclerotic lesion size. Exercise positively modulates several risk factors associated with cardiovascular disease including hypertension, hyperlipidemia, adiposity and obesity, systemic levels of oxidative stress, inflammation, and glucose tolerance. Exercise significantly reduced mean lesion size in vehicle-treated animals. To assess the mechanism of protection of exercise in chapter 4, vascular reactivity studies were performed to measure endothelial function after exposure to PCB 77. Exercise prevented PCB-impaired endothelial function implicating the role of superoxide as a cause of impairment. Exercise upregulated phase II antioxidant enzymes. The work in this dissertation demonstrates several protective properties of exercise against PCB-induced cardiovascular disease; however, additional studies are needed to determine if exercise enhances metabolism and excretion of these environmental pollutants

2019 GREAT Day Program

SUNY Geneseo’s Thirteenth Annual GREAT Day.https://knightscholar.geneseo.edu/program-2007/1013/thumbnail.jp