10,000 publications from this institution
Summary This paper presents an investigation of infill drilling performance and reservoir continuity with geostatistics and a reservoir simulator. The geostatistical technique provides many possible realizations and realistic descriptions of reservoir heterogeneity. Correlation between recovery efficiency and thickness of individual sand subunits is shown. Additional recovery from infill drilling results from thin, discontinuous subunits. The technique may be applied to variations in continuity for other sandstone reservoirs.
Abstract Recapitulating the three ages of “urban ethnography” born in Chicago a century ago, this book puts into historical and analytical perspective a controversy over the ethnography of nexus of race, class and morality in and around the Black American ghetto in the age of triumphant neoliberalism, in order to draw from it positive lessons for the theory and practice of fieldwork. Thoughtless empiricism, acceptance of problematics prefabricated by ordinary and political common sense, confusion between folk and analytical categories, confinement to the immediate perimeter of interaction, bifurcating moralism: these are all traps that every ethnographer encounters sooner or later on her path and that only collective vigilance can hope to thwart. This epistemological return is an opportunity to pinpoint the danger of ethnographism, the tendency to want to describe, interpret and explain a phenomenon based solely on the elements discerned through fieldwork, and to call for the correlative practice of an enactive, structural, and historicized ethnography that sets out to embed the microactions observed in the interlocking series of nested social spaces that shape them and give them sense. Such an ethnography allows us to avoid falling into one or another of the five fallacies of participant observation: interactionism, inductivism, populism, presentism, and the hermeneutic drift. And to move beyond Clifford Geertz’s “thick description” with the “thick construction” inspired by Pierre Bourdieu, whose mission is to construct scientifically the ordinary social construction of reality.
Discharge lamps can be classified as high-pressure and low-pressure lamps, which operate under different scientific principles. They have exhibited the well-known fingerprints of memristors. This paper describes the mathematical models of both of high- and low-pressure discharge lamps based on their respective physical nature and behaviors, and then explains how these models can be unified into a generalized mathematical framework that confirms their memristor characteristics. Practical and theoretical results from high-pressure and low-pressure lamps are included to illustrate their 3 fingerprints of the memristor characteristics. The results indicate that gas discharge lamps are not ideal but volatile memristors.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
The authors propose the oscillator neural network, in which the sigmoid nonlinearity of the Hopfield neural network is replaced by the Van der Pol oscillator. The oscillator neural network has the advantage that no simulated annealing is necessary to obtain a reasonable solution. They demonstrate that the 4-b analog to digital (A/D) converter problem, the 10-city traveling salesman problem and the associative memory problem, can be solved by the proposed neural network.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
