49,771 research outputs found
Recent results using all-point quark propagators
Pseudofermion methods for extracting all-point quark propagators are
reviewed, with special emphasis on techniques for reducing or eliminating
autocorrelations induced by low eigenmodes of the quark Dirac operator. Recent
applications, including high statistics evaluations of hadronic current
correlators and the pion form factor, are also described.Comment: LateX, 3 pages, 6 eps figures, Lattice2002(algor), corrected some
typo
Technique of the step-by-step integration of ordinary differential equations
In Part 1 step-by-step methods are examined critically and emphasis is placed on the dependence of the error on the number n of steps used for a given range of the independent variable. The index of a process is defined and it is shown that the errors can be assessed and partially corrected when the index is known and results obtained for two or more values of n. Attention is drawn to the advantages in certain cases of a part-analytical process.
In Part 2 methods of numerical integration in general are classified and briefly reviewed. The chart, Table 2.2.1, summarises the classification
Income and Child Well-Being. THIRTY-FOURTH GEARY LECTURE, 2005
My topic this afternoon is the link between family income and the well-being of children. While it is easy to document the better health and higher achievement of children who have grown up in richer as opposed to poorer families, it is much harder to isolate the causal impact of income itself. Children growing up in higher income families are advantaged in many other ways, including having parents who have completed more formal schooling and are embedded in higher-status social networks, and whose genetic endowments may provide cognitive and health-related advantages
How the Turtle Lost its Shell: Sino-Tibetan Divination Manuals and Cultural Translation
This article is a pan-Himalayan story about how the turtle, as a cultural symbol within Sino-Tibetan divination iconography, came to more closely resemble a frog. It attempts a comparative analysis of Sino-Tibetan divination manuals, from Tibetan Dunhuang and Sinitic turtle divination to frog divination among the Naxi people of southwest China. It is claimed that divination turtles, upon entering the Himalayan foothills, are not just turtles, but become something else: a hybrid symbol transformed via cultural diffusion, from Han China to Tibet, and on to the Naxi of Yunnan. Where borders are crossed, there is translation. If we go beyond the linguistic definition of translation towards an understanding of transfer across semiotic borders, then translation becomes the reforming of a concept from one cultural framework into another. In this way, cultural translation can explain how divination iconography can mutate and transform when it enters different contexts; or in other words, how a turtle can come to lose its shell
Hadronic Correlators from All-point Quark Propagators
A method for computing all-point quark propagators is applied to a variety of
processes of physical interest in lattice QCD. The method allows, for example,
efficient calculation of disconnected parts and full momentum-space 2 and 3
point functions. Examples discussed include: extraction of chiral Lagrangian
parameters from current correlators, the pion form factor, and the unquenched
eta-prime.Comment: LATTICE01(Algorithms and Machines
Key Components and Best Practices for Environmental Impact Assessments
New and emerging activities pose risks to the conservation and sustainable development of ABNJ in the absence of prior assessment, and remain a significant gap under UNCLOS. Environmental impact assessments and strategic environmental assessments are widely accepted as valuable tools for incorporating environmental and social concerns into decision making processes with respect to specific projects or activities (EIAs) or policies, plans or programmes (SEAs). The development of a new international instrument to address the conservation and sustainable use of marine biological diversity in areas beyond national jurisdiction ("international Instrument") is an opportunity to incorporate best practices for EIAs and SEAs already found under a number of multilateral and regional agreements, and apply lessons learned from their application. Importantly, the new Instrument should also provide the mechanism for the assessment of cumulative impacts of activities and climate change
A rigorous and efficient asymptotic test for power-law cross-correlation
Podobnik and Stanley recently proposed a novel framework, Detrended
Cross-Correlation Analysis, for the analysis of power-law cross-correlation
between two time-series, a phenomenon which occurs widely in physical,
geophysical, financial and numerous additional applications. While highly
promising in these important application domains, to date no rigorous or
efficient statistical test has been proposed which uses the information
provided by DCCA across time-scales for the presence of this power-law
cross-correlation. In this paper we fill this gap by proposing a method based
on DCCA for testing the hypothesis of power-law cross-correlation; the method
synthesizes the information generated by DCCA across time-scales and returns
conservative but practically relevant p-values for the null hypothesis of zero
correlation, which may be efficiently calculated in software. Thus our
proposals generate confidence estimates for a DCCA analysis in a fully
probabilistic fashion
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