1,355,028 research outputs found
Seeing and knowing: Story and plot in '5x2'
No full textRecounting a couple's doomed marriage in reverse, Francois Ozon's unsettling representation of romantic incompatibility both manipulates traditional narrative conventions and allows key events to remain ambiguous. As Dennis Bruining contends, the film presents a useful case study in the distinctions between story and plot, and the difficulties that viewers may face in attempting to reconcile them
On the Riemann solutions of the balance equations for steam and water flow in a porous medium
No full textConservation laws have been used to model a variety of physical phenomena and therefore the theory for this class of equations is well developed. However, in many problems, such as transport of hot fluids and gases undergoing mass transfer, balance laws are required to describe the flow. As an example, in this work we obtain the solutions for the basic one-dimensional profiles that appear in the clean up problem or in recovery of geothermal energy. We consider the injection of a mixture of steam and water in several proportions in a porous rock filled with a different mixture of water and steam. We neglect compressibility, heat conductivity and capillarity and present a physical model for steam injection based on the mass balance and energy conservation equations. We describe completely all possible solutions of the Riemann problem. We find several types of shock between regions and develop a scheme to find the solution from these shocks. A new type of shock, the evaporation shock, is identified in the Riemann solution. This work generalizes the work of Bruining et. al., where the condensation shock appears. It is a step towards obtaining a general method for solving Riemann problems for a wide class of balance equations with phase changes.GeotechnologyCivil Engineering and Geoscience
Effect of fines migration on oil-water relative permeability during two-phase flow in porous media
No full textAbstract not availableAbbas Zeinijahromi, Rouhi Farajzadeh, J. (Hans) Bruining, Pavel Bedrikovetsk
Uniqueness conditions in a hyperbolic model for oil recovery by steamdrive
No full textBruining, J.; Duijn, C.J. van. (1999). Uniqueness conditions in a hyperbolic model for oil recovery by steamdrive. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/3433
Immiscible and Miscible Gas-Oil Gravity Drainage in Naturally Fractured Reservoirs
No full textIn the phase of declining oilfields and at a time when recovering hydrocarbons has becoming more difficult, effective techniques are the key to extract more oil from mature fields. The difficulty of developing effective techniques is often the real obstacle when dealing with heterogeneous formations such as naturally fractured reservoirs, which are among the most challenging class of hydrocarbon formations. Because of the large degree of heterogeneity, in terms of reservoir properties, the production methods from naturally fractured reservoirs differ from the production methods from conventional reservoirs. To identify an efficient and optimum strategy for oil production from naturally fractured reservoirs, fluid displacement mechanisms at reservoir conditions need to be understood. Gas injection into the conventional reservoirs has been already common practice for years. However, gas injection into naturally fractured reservoirs is still controversial. This is mainly due to the existence of highly permeable fracture systems in fractured reservoirs. These highly permeable and interconnected fracture networks offer easy-flow pathways to the injected gas. As a result, the injected gas is usually produced without sufficient contact with the oil in the matrix, which is left behind and unproduced. Therefore, it is of practical importance to examine the efficiency of a gas injection process in naturally fractured reservoirs to achieve a reliable and effective production process. This thesis is a collection of experimental and theoretical work on the efficiency of gas-oil gravity drainage process in naturally fractured reservoirs. Gas injection experiments were performed using a modified experimental set-up to simulate the gravity-drainage process in naturally fractured reservoirs. In this thesis, the possibilities and limitations of improved oil recovery from fractured reservoirs by gas injection are investigated.Geoscience and EngineeringCivil Engineering and Geoscience
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Successful management buyouts: Are they really more entrepreneurial?
No full textThe paper explores the impact of entrepreneurial management dimensions on post-MBO financial performance. We use Stevenson’s conceptualization of entrepreneurship (1983), empirically validated by Brown, Davidsson and Wiklund (2001), positing that entrepreneurial companies will be involved in recognizing and exploiting opportunity, regardless of the resources controlled. From the literature we hypothesize positive effects of entrepreneurial management dimensions on post-MBO financial performance. We find that successful buyout managers cannot be classified as entrepreneurs on all entrepreneurial dimensions. Instead they ambidextrously combine the pursuit of valuable opportunities with the exploitation and control of their resources. Implications for theory and managerial practice are discussed.Entrepreneurial Management;Financial Performance;Management Buyouts
Variations on the Author
No full text“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
Aerodynamic characteristics of a curved plate airfoil section at Reynolds numbers 60000 and 100000 and angles of attack from -10 to +90 degrees
No full textAerospace Engineerin
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
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