1,726,878 research outputs found
Intrinsic superconducting phases in La2-xSrxCuO4 single crystals at magic dopings
Full text linkZhao, Z. (2014). Intrinsic superconducting phases in La2-xSrxCuO4 single crystals at magic dopings. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/163105
Reference Model Guided Engineering
Full text linkEnvironmental research infrastructures (RIs) support their respective re-search communities by integrating large-scale sensor/observation networks with data curation and management services, analytical tools and common operational policies. These RIs are developed as service pillars for intra- and interdisciplinary research; however, comprehension of the complex, interconnected aspects of the Earth’s ecosystem increasingly requires that re-searchers conduct their experiments across infrastructure boundaries. Con-sequently, almost all data-related activities within these infrastructures, from data capture to data usage, need to be designed to be broadly interoperable in order to enable real interdisciplinary innovation and to improve service offerings through the development of common services. To address these interoperability challenges as they relate to the design, implementation and operation of environmental RIs, a Reference Model guided engineering approach was proposed and has been used in the context of the ENVRI cluster of RIs. In this chapter, we will discuss how the approach combines the ENVRI Reference Model with the practices of Agile systems development to design common data management services and to tackle the dynamic requirements of research infrastructures
Condition Gauge and Potential Theory for the Schrodinger Operator
No full textCranston, M.; Fabes, E.; Zhao, Z.. (1986). Condition Gauge and Potential Theory for the Schrodinger Operator. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/4456
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
An experimental investigation of the contact area between a glass plane and both metallic and carbon- nano-tube electrical contacts
No full textThe work presented follows an initial study into a
method for the 3-dimensional (3D) scanning of an electrical
contact surface, while in physical contact with a glass plane. The
method allows the measurement of contact force and the
associated contact area in contact with the glass. A new test
apparatus is presented which allows improved control of the
contact force and improved analysis of the contact area. The
materials investigated include Ag and Cu contact surfaces and a
multi-walled carbon nano-tube-Au composite surface.
The methodology uses a con-focal laser scanner with
2?m spot size and 10nm resolution to measure the contact
surface height (Z) through the glass plane. A levelling procedure
is used to ensure that the true contact region is measured, and a
data grid resolution of 0.1?m in the X,Y plane is used to identify
the contact regions. The contact asperities are identified and
compared with measurements using an AFM probe. The results
are used to provide input data to the Greenwood-Williamson
model for contact mechanics
Using Matching to Estimate Treatment Effects: Data Requirements, Matching Metrics, and Monte Carlo Evidence
No full textWe compare propensity-score matching methods with covariatematching estimators. We first discuss the data requirements of propensity-score matching estimators and covariate matching estimators. Then we propose two new matching metrics incorporating the treatment outcome information and participation indicator information, and discuss the motivations of different metrics. Next we study the small-sample properties of propensity-score matching versus covariate matching estimators, and of different matching metrics, through Monte Carlo experiments. Through a series of simulations, we provide some guidance to practitioners on how to choose among different matching estimators and matching metrics. © 2004 President and Fellows of Harvard College and the Massachusetts Institute of Technology.
Nonnegative inverse eigenvalue problems with partial eigendata
No full textIn this paper we consider the inverse problem of constructing an
-by- real nonnegative matrix from the prescribed partial eigendata. We first give the solvability conditions for the inverse problem without the nonnegative constraint
and then discuss the associated best approximation problem.
To find a nonnegative solution, we reformulate the inverse problem as a monotone complementarity problem and propose a nonsmooth Newton-type method for solving its equivalent nonsmooth equation. Under some mild assumptions, the global and quadratic convergence of our method is established. We also apply our method to the symmetric nonnegative inverse problem and to the cases of prescribed lower bounds and of prescribed entries. Numerical tests demonstrate the efficiency of the proposed method and support our theoretical findings
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
