1,720,963 research outputs found
`DESIGN OF POLYMERIC NANOCOMPOSITE MEMBRANE FOR SEPARATION PROCESSES
No full textSulfur-containing compounds are well-known pollutants in fuels. Because of concerns about catalyst poisoning and environmental issues, it is crucial to remove these substances before commercial usage. Deep desulfurization of transportation fuels is therefore currently an urgent problem, and numerous attempts have been made in this direction. Membrane desulfurization can be a good alternative to the traditional hydrodesulfurization method which is not an economically profitable and efficient process.
In this research work, MOF-5 was synthesized and doped with different transition metals and was further incorporated as fillers in the PVDF matrix using phase inversion and spray coating methods. Membranes were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), and water contact angle measurements. To conduct the desulfurization process separate solutions of thiophene and dibenzothiophene (DBT) in octane as model oil were used. The separation performances of fabricated membranes were evaluated by removal efficiency and permeation flux which were calculated from the results of the experiments. The results show that MOF-5/Ag had the best thiophene separation efficiency - 84.62% due to its higher coordination geometry and electron density. All membranes were not selective to DBT so its concentration after the process did not decrease
Cultivation of absence
No full textLAUREA MAGISTRALEThis project explores landscapes that have been altered by large-scale human activity and how these changes are affecting the communities. As a place, the landscape tells the story of a group of people, as events through time are charted, offering a sense of conti- nuity and rootedness—a cultural context to start to understand cultur- al heritage against. The project intends to reclaim devastated land- scape of dying sea and reinforce restoration program of Aral. Archi- tecture, in this project works as a substitute material in nature and embraces the sense of evolution. The goal is to reinterpret new reality of this area forward new uses, sustaining local identity. While the ruins of the sea clearly disintegrate the original way of life, it becomes necessary to understand a system of actions that can bring the community forward and cultivate a harmonious life cycle. In order to identify with the community, the project must act as a catalyst for the local identity which is in a state of flux, yet be connected to the source
PERFORMANCE ANALYSIS OF EDGE COMPUTING FOR 5G AND INTERNET OF THINGS
Get PDFThis thesis aims to explore edge computing paradigm for Internet of Things services
and applications in the 5G era. Edge computing, with its processing and storage capabilities
near end-users, can become a reasonable alternative to cloud computing. User device with
constrained processing and storage capabilities offloads complex task to edge nodes for
computing, and then, edge nodes transmit the outcomes back to the user. Though various
requirements need to be met while deploying edge computing in smart applications, this work
focuses on the most demanding and critical ones, such as latency and system reliability. It is
crucial to minimize latency and enhance the reliability of the system in time-critical services,
such as smart healthcare or transportation. Current research implements a single user – multiple
edge nodes model with Rayleigh and Nakagami-m fading channels. It is worth noting that
Nakagami-m fading channels are widely used in the fifth generation and beyond systems. In
order to comprehensively investigate the topic of edge computing for Internet of Things, we
have developed two different types of schemes. Specifically, selection schemes, in which user
device offloads task to one edge node, and combining schemes, in which user device offloads
task to several edge nodes concurrently. Concerning selection-based schemes, edge computing
with cache-aided relay and cache-free relay are considered. In these schemes, offloading nodes
are chosen based on the best computing capability, channel gain between user and edge node,
or channel gain between the user device and relay node. Numerical results demonstrate that
edge computing model with cache-free relay, where the best channel gain between the relay
and edge node is selected, outperforms other models in system performance. At the same time,
time-division multiple access, frequency-division multiple access, and capacity achieving
schemes are introduced for combining case. Thus, it can be summarized that edge computing
model with capacity achieving scheme demonstrates the highest results among the others in
terms of the reliability metric. Moreover, performance analysis shows that system efficiency can be affected by various parameters, such as transmit power, channel bandwidth, task size,
latency threshold, number of edge nodes, and others. Numerical and simulation results are
provided to validate analytical findings
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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