1,720,957 research outputs found
Effects of fines migration on CO2 well injectivity
Full text linkMaster's thesis in Petroleum engineeringCarbon capture and storage is considered an important way to reduce atmospheric emission of greenhouse gases such as CO2. This technology involves capture of carbon from the source of emission, transportation to storage sites and then injection into the suitable formations, oceans and other storage options.
This paper is focused on injectivity issues related to injection of supercritical CO2 into the formation. When CO2 is injected into sandstone, interaction between the injected CO2, formation brine and the rock minerals, generate fine particles inside this porous media which could affect the injection process. This paper recognizes mineral dissolution as the source of fines inside the porous media. Interaction of CO2, formation water and rock under suitable range of temperature and pressure is cause of mineral dissolution. During CO2 reinjection, the injected fluid could transport these fine particles into the porous media. The transported fines could bridge pore channels and consequently reduce rock permeability and hence CO2 injectivity. Unfortunately, this phenomenon have not been well studied experimentally.
Based on literature research, the estimated amount of calcite precipitation after 100 days of CO2 storage was found. Necessary calculations were done to inject same concentration of alumina particles into Berea sandstone core. After particle injection, CO2 injection was done and permeability of the core was measured. In this way, laboratory approximation of CO2 reinjection after 100 days was constructed. Significant reduction in permeability was recorded in the presence of particles.
After this, alternate brine and CO2 injection was performed in the same core to see if brine could push fine particles out of the core and improve permeability of the core. However, there was no significant improvement in permeability after this alternate injection.
Another experiment was conducted to see the effect of salt precipitation inside the core. This experiment did not involve injection of particles. However, very high salinity of NaCl brine was injected and vaporized with dry CO2 and then permeability was measured. Brine experiment also showed significant decline in permeability. Permeability improved when concentration of brine was reduced
The Role of External Actors in Nepal's Peace Process
No full textThis thesis examines the diplomatic, military and economic interventions of three external state actors – namely, India, China and the United States – during Nepal’s peace process (2005-2015). It identifies three critical junctures in Nepal’s peace process that were likely to be influenced by external interventions: the Comprehensive Peace Accord (CPA) 2006, the Constituent Assembly (CA) Elections 2008, and the Constitution of Nepal 2015. Introducing an external intervention typology framework, this research identifies and compares the specific nature of the interventions undertaken by each of the three external actors at each of the three critical junctures. By examining the wide range of intervening measures used by India, China and the US, it finds that the relative influence wielded by each actor varied at each juncture: while India was more influential than China and the US during negotiations over the CPA, it was the least influential actor during the Constitution promulgation phase. Similarly, while China and the US failed to influence the peace process outcomes during the first critical juncture, their interventions corresponded with the peace process outcomes during the third critical juncture. Thus, although each of the three external actors influenced the peace process at particular junctures, none were influential enough to alter the trajectory of the peace process in its entirety, either positively or negatively. This thesis thus argues that in cases such as that of Nepal, a relatively small state which is subject to the competing interests of great powers and big neighbours can exercise agency, defy external powers’ interventions that do not serve the interests of peace, and shape the trajectory of its own peace process. It demonstrates that at each of the three critical junctures, domestic political actors were able to capitalise on strategic competition between India, China, and the US, to achieve the support of at least one of these external actors. Similarly, local actors were also able to resist interventions that appeared to be against domestic peace process initiatives, by gaining the backing of one or more of the intervening state’s strategic competitors. That is, domestic political actors were able to lead and control the peace process by using the complex geopolitical context and the competing strategic interests of great powers and neighbours to their advantage.
With extensive interviews of influential politicians, diplomats, bureaucrats and/or scholars from Nepal, India, China and the United States, this thesis not only produces a comprehensive, in-depth, and original research study on external interventions in Nepal’s peace process, but it also offers insights on how a small power can gain agency to tackle major powers and big neighbours to lead and protect its peace process, especially when the civil war country has a complex geopolitical milieu and competing strategic interests of big powers and neighbours.Thesis (PhD Doctorate)Doctor of Philosophy (PhD)School of Govt & Int RelationsGriffith Business SchoolFull Tex
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
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
Geopolitics of COVID-19 and pandemic diplomacy in South Asia
No full textCoronavirus pandemic has caused severe impact on low-income to lower-middle economies, compared to the high-income economies. Small and impoverished states of South Asia have been hit hard by the pandemic. They have had to bear the harsher impact as these countries have a high-density population, poor health infrastructure, poor access to basic health services, and wide economic and social disparities. In addition, the poor economies of these countries have been weakened further, mainly by extended lock downs. Such impacts have made South Asian nations more vulnerable to big power influences like India, China, and the United States. This chapter, in this context, examines how these big powers are competing in the region and how it could be an opportunity for South Asian nations to benefit from strategic engagements in the region. This chapter concludes that despite the pandemic diplomacy
of great powers for geopolitical competition in the region, the smaller South Asian nations need to deal with big powers proactively to benefit from their support packages, including their vaccine aid. It will also be vital for small powers to strengthen the regional platforms like SAARC and push the Coronavirus-related problems.No Full Tex
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
Re-democratising Nepal: transitional justice and the erosion of judicial independence
No full textFor more than a decade, Nepal has been undergoing a process of re-democratisation, its third transition to democracy since the 1950s. Among the key pillars of the new democratic regime has been the establishment of constitutionally guaranteed judicial independence. Focusing on the role of the Supreme Court in defining, overseeing, and adjudicating Nepal's transitional justice process, this article considers the extent to which judicial independence and empowerment have been achieved in Nepal's ongoing democratic transition. It argues that despite institutional measures designed to protect judicial independence and efforts by members of the Supreme Court to exercise independence in their judgments, Nepal's re-democratisation process has seen the erosion of judicial independence. In doing so, the article provides new insights into the relationship between institutional judicial independence and judicial empowerment during transitions to democracy, and highlights a significant area of concern for the achievement of democratic consolidation in Nepal.No Full Tex
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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