Perturbative calculation of improvement coefficients to O(g^2a) for bilinear quark operators in lattice QCD

We calculate the O(g^2 a) mixing coefficients of bilinear quark operators in lattice QCD using a standard perturbative evaluation of on-shell Green's functions. Our results for the plaquette gluon action are in agreement with those previously obtained with the Schr\"odinger functional method. The coefficients are also calculated for a class of improved gluon actions having six-link terms.Comment: 14 pages, REVTe

Cities and Health: A Response to the Recent Commentaries

We are grateful to our many colleagues who took the time to respond to our analysis of Shanghai’s declining “avoidable mortality.”1 The range of their perspectives across 5 recent commentaries reassures us that the topic is worthy of sustained study. Indeed, the presumption behind our comparative research on healthcare in world cities 2 is that the city is a strategic unit of analysis for understanding the health sector and that world cities share a host of important characteristics

Advancing the Rights of Children and Adolescents to Be Altruistic: Bone Marrow Donation by Minors

This article examines the standards used for answering the question of whether minors should be allowed to donate bone marrow. Part II introduces the legal background and the standards currently used by courts. Part III explores the unsatisfactory nature of these standards. Part IV presents an empirical study that is intended to provide some help in understanding what might be a useful and respectful standard. Part V concludes the article with a discussion of two alternative revised standards grounded in the doctrines of substituted judgment and the best interests of the child

Physical Retrieval of Surface Emissivity Spectrum from Hyperspectral Infrared Radiances

Retrieval of temperature, moisture profiles and surface skin temperature from hyperspectral infrared (IR) radiances requires spectral information about the surface emissivity. Using constant or inaccurate surface emissivities typically results in large retrieval errors, particularly over semi-arid or arid areas where the variation in emissivity spectrum is large both spectrally and spatially. In this study, a physically based algorithm has been developed to retrieve a hyperspectral IR emissivity spectrum simultaneously with the temperature and moisture profiles, as well as the surface skin temperature. To make the solution stable and efficient, the hyperspectral emissivity spectrum is represented by eigenvectors, derived from the laboratory measured hyperspectral emissivity database, in the retrieval process. Experience with AIRS (Atmospheric InfraRed Sounder) radiances shows that a simultaneous retrieval of the emissivity spectrum and the sounding improves the surface skin temperature as well as temperature and moisture profiles, particularly in the near surface layer

Scaling, asymptotic scaling and Symanzik improvement. Deconfinement temperature in SU(2) pure gauge theory

We report on a high statistics simulation of SU(2) pure gauge field theory at finite temperature, using Symanzik action. We determine the critical coupling for the deconfinement phase transition on lattices up to 8 x 24, using Finite Size Scaling techniques. We find that the pattern of asymptotic scaling violation is essentially the same as the one observed with conventional, not improved action. On the other hand, the use of effective couplings defined in terms of plaquette expectation values shows a precocious scaling, with respect to an analogous analysis of data obtained by the use of Wilson action, which we interpret as an effect of improvement.Comment: 43 pages ( REVTeX 3.0, self-extracting shell archive, 13 PostScript figs.), report IFUP-TH 21/93 (2 TYPOS IN FORMULAS CORRECTED,1 CITATION UPDATED,CITATIONS IN TEXT ADDED

The Environmental Impacts of Consumption: Research Methods and Driving Forces

The aim of this study is to develop an operational method to determine the direct and indirect environmental impacts of Austrian household's consumption pattern and to apply this method together with social research methods to evaluate the household's consumption pattern of two different settlements. The operational method is set up on the Household Environmental Impact (HEI) assessment based on household interviews, and without conducting a full consumer expenditure survey. The empirical research is designed as a case-control study of the car-free settlement in Vienna and aims to evaluate how the consumption patterns of the inhabitants differ from a 'control group', what that impact has on the environment taking the income (or 'rebound') effect into account, and how the attitudes and social determinants of behavior differ between the two groups. The environmental profile of the household is calculated by using consumer expenditure surveys, information from the national accounting tables (with environmental accounts), from product life cycle assessment, and data from the conducted survey. Survey research on the motivations, preferences, and social factors is used to evaluate the driving forces and social dynamics that determine the environmental profiles of the selected households. Residents in the car-free settlement have changed their daily mobility routines for good. Daily mobility needs are covered by public transport and bicycle. The high importance of the issue "car-use" in the car-free settlement, the fact that car mobility is still a very important topic in the settlement, and the environmentally conscious micro-culture in the car-free settlement contributes to the stabilization of the car-free habit of the tenants. Due to that only people with low car mileage state adequate attitudes, and do have much more car-free friends. Whereas the extremely low car traffic in the car-free settlement could only be partly explained by settlement attributes, there is no empirical indication to explain air traffic. The results show that car-free households have substantially lower environmental impacts in the categories of ground transportation and energy use, their CO2 emissions of these two categories are less than 50% of those of the reference settlement. The car-free households have somewhat higher emissions in the categories air transport, nutrition, and 'other' consumption, reflecting the slightly higher income per-capita. As a result, the CO2 emissions are only slightly lower than in the reference settlement. The research is designed to lay the foundation for policy making through providing tools to determine the environmental impacts of consumption, as well as insight into alternative consumption patterns and factors that shape those patterns