1,742,823 research outputs found
Two-phase flow of gas-liquid mixtures on horizontal helical pipes
Get PDFThe aim of this study was to investigate hydrodynamic two -phase (namely
water and air) fluid flow characteristics in helical pipes of low amplitude and
straight pipes of the same internal-diameter and constructional material: the
results for the two pipes have then been compared.
One of the objectives was to measure pressure, pressure drop and liquid
holdup in the two pipes. These are universal dominant parameters in the oiland-
gas industry as they significantly impact on the exploitation and
conveyance of crude oil from wells or reservoirs to the process plant, where the
crude is refined. The second objective was to examine applications of the
helical pipe.
Experiments were performed on three different helical pipes of internal
diameters 25.4 mm, 50 mm and 100 mm and their straight counterparts. The
single-phase preliminary experimental results from the 25.4 mm internaldiameter
for both pipes have shown that both pressure and pressure drop are
higher in the helical pipe than in the straight pipe. The friction factors were also
evaluated for both pipes and found to be higher in the helical pipe than in the
straight pipe. The single-phase and two-phase experimental results for the 50
mm internal-diameter pipes confirmed the conclusions from the preliminary
experimental results. The two-phase results showed that slug flow occurred in
the straight pipe at certain superficial velocities of air and water, whereas at the
same superficial velocities of air and water, slug flow did not ensue in the helical
pipe - instead bubbly flow was observed. Stratified flow occurred in the straight
pipe at very low superficial velocities of air and water but under these same
conditions, bubbly flow ensued in the helical pipe.
A section of 100 mm internal-diameter helical pipe was installed at some
distance from a catenary-shaped riser, with a view to investigating the
effectiveness of the helical pipe in mitigating severe slugging. The results
showed promise as the section of the helical pipe proved to be successful in
reducing the menace of severe slugging. This novel finding is regarded as a
breakthrough for the oil-and-gas industry in this respect. This is because
hydrocarbon proven reserves in the off-shore (i.e. deep sea-water) environment
have been estimated to be close to 60%. All previous research studies over the
past decade to provide solution to the problem posed by severe slugging have
not yielded any appreciable results. This discovery also has the advantages of
reducing the demand on the topside (process) facility and the achievement of
stability of liquid production is resulted from the consequent flow assurance in
the pipeline and riser
BS 7000-6:2005 Design management systems. Managing inclusive design. Guide
No full textBS 7000-6 provides the guidelines for adoption of inclusive approach to to design of products.
BS 7000 Part 6 is the British Standard that is a part of the BS 7000 series on Design Management Systems and this part provides guidance on managing inclusive design at both organization and project levels, though the inclusive approach ultimately encompasses the whole of business and management. Inclusive design is comprehensive, integrated design which encompasses all aspects of a product used by consumers of diverse age and capability in a wide range of contexts.
BS 7000-6 is relevant to all types of products and services, and to the business processes involved in their creation, fabrication, delivery and sustenance in the market, throughout the product’s lifecycle from conception to final disposal, including management of obsolescence. It applies to all levels of staff and management in all types of organizations operating in the manufacturing, process, service and construction industries, as well as in public and not-for-profit sectors.
This standard provides a strategic framework and associated processes by which business executives and design practitioners can understand and respond to the needs of diverse users without stigma or limitations, and is aimed at:
Top executives of all organizations offering products and services. It helps them to lead the introduction of an inclusive approach and evolve an appropriate corporate culture that nurtures inclusive success.
Middle executives who set up and administer product and service development projects. It helps them formulate better-focused and more enlightened briefs. It also assists in motivating project teams as well as the evaluation of solutions generated.
Junior executives and specialists who are assigned to project teams that create and develop products and services. It helps them adopt more appropriate perspectives and approaches to inclusive design.
Executives responsible for procuring outsourced product design services and supplies, and for adhering to agreed specifications. It helps them to sustain the inclusive approach throughout the supply chain
7000 years
No full textThe sketch shows an Egyptian pupil holding an Egypt flag and telling he is 7000 years old to a couple of tourists as a symbol of Egyptian civilizationتلميذ مصري يحمل علم مصر يذكر أن عمرة 7000 سنة كرمز للإفتخار بالحضارة المصرية لزوجان من السائحي
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
Rearwin 7000
No full text1/2 left side view of a Rearwin 7000 civilian plane on the ground.https://corescholar.libraries.wright.edu/special_ms223_photographs/2026/thumbnail.jp
Redline 7000.
No full textPublished to accompany the exhibition "Redline 7000", held at 200 Gertrude Street, Friday 4-Saturday 26 May 1990
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
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