Rigid Spool & Riser Slugging Induced Vibrations

2021 ◽  
Author(s):  
Raghid Aljarah ◽  
Kevin Le Prin ◽  
Claire Saunier ◽  
Matthieu Minguez
Keyword(s):  
Best Practices ◽  
Mechanical Behavior ◽  
Slug Flow ◽  
Large Scale ◽  
Real Life ◽  
Intermittent Flow ◽  
Flow Properties ◽  
Coupling Approach ◽  
Life Behavior

Abstract The paper addresses response of subsea components subject to internal intermittent slug flows. The proposed work pursues experiments already published last year (OMAE2020-18620) and focuses on the way to numerically model such complex coupled physics for both rigid spool and steel lazy wave riser. The first part of the paper relies on the coupling approach already presented in OTC-29306 and OMAE2020-18620 mixing (i) Finite Element solver to predict the mechanical behavior of the system and (ii) a Unit Cell solver to recover the intermittent slug flow. It accounts for both (i) the complexity of the slug flow properties at the spool inlet and (ii) their variability along the system. This approach is successfully compared to the experimental (large scale) results already published. This preliminary step validates the ability of the proposed numerical model to recover real-life behavior and underlines some limitations resulting from the Industry Best Practices use. The second part of the paper extends the applicability of the proposed coupling philosophy to a steel lazy wave riser where a classical Flow Assurance software (e.g. Olga) is considered for the characterization of the intermittent flow and then coupled with a mechanical solver. This one-way coupling accounts for the slugging variability along the riser length and consequently exhibits a finer granularity of the mechanical behavior of the riser. This modelling is then compared to the industry best practices to open a discussion on the observed differences.

scholarly journals Four dimensions characterize comprehensive trait judgments of faces

2019 ◽  
Author(s):  
Chujun Lin ◽  
Umit Keles ◽  
Ralph Adolphs
Keyword(s):  
Large Scale ◽  
Real Life ◽  
Three Dimensions ◽  
Prior Work ◽  
Four Dimensions ◽  
Individual Level ◽  
Level Data ◽  
Trait Words ◽  
Psychological Dimensions

People readily attribute many traits to faces: some look beautiful, some competent, some aggressive1. These snap judgments have important consequences in real life, ranging from success in political elections to decisions in courtroom sentencing2,3. Modern psychological theories argue that the hundreds of different words people use to describe others from their faces are well captured by only two or three dimensions, such as valence and dominance4, a highly influential framework that has been the basis for numerous studies in social and developmental psychology5–10, social neuroscience11,12, and in engineering applications13,14. However, all prior work has used only a small number of words (12 to 18) to derive underlying dimensions, limiting conclusions to date. Here we employed deep neural networks to select a comprehensive set of 100 words that are representative of the trait words people use to describe faces, and to select a set of 100 faces. In two large-scale, preregistered studies we asked participants to rate the 100 faces on the 100 words (obtaining 2,850,000 ratings from 1,710 participants), and discovered a novel set of four psychological dimensions that best explain trait judgments of faces: warmth, competence, femininity, and youth. We reproduced these four dimensions across different regions around the world, in both aggregated and individual-level data. These results provide a new and most comprehensive characterization of face judgments, and reconcile prior work on face perception with work in social cognition15 and personality psychology16.

INSIGHT INTO THE GROWTH MECHANISM OF WS2 NANOTUBES IN THE SCALED-UP FLUIDIZED-BED REACTOR

NANO ◽  
2009 ◽  
Vol 04 (02) ◽  
pp. 91-98 ◽  
Author(s):  
A. ZAK ◽  
L. SALLACAN-ECKER ◽  
A. MARGOLIN ◽  
M. GENUT ◽  
R. TENNE
Keyword(s):  
Mechanical Behavior ◽  
Fluidized Bed ◽  
Growth Mechanism ◽  
Large Scale ◽  
Analytical Techniques ◽  
Fluidized Bed Reactor ◽  
Crystalline Order ◽  
Catalyst Free ◽  
Insight Into

The growth mechanism of WS2 nanotubes in the large-scale fluidized-bed reactor is studied in greater detail. This study and careful parameterization of the conditions within the reactor lead to the synthesis of large amounts (50–100 g/batch) of pure nanotubes, which appear as a fluffy powder, and (400–500 g/batch) of nanotubes/nanoplatelets mixture (50:50), where nanotubes usually coming in bundles. The two products are obtained simultaneously in the same reaction but are collected in different zones of the reactor, in a reproducible fashion. The characterization of the nanotubes, which grow catalyst-free, by a number of analytical techniques is reported. The majority of the nanotubes range from 10 to 50 micron in length and 20–180 nm in diameter. The nanotubes reveal highly crystalline order, suggesting very good mechanical behavior with numerous applications.

scholarly journals The mode of theatricality in the work of representatives of “Bu-Ba-Bu” group

2021 ◽  
Vol 27 (4) ◽  
pp. 204-211
Author(s):  
Oksana Nikolaieva
Keyword(s):  
Mass Culture ◽  
Large Scale ◽  
Real Life ◽  
Literary Work ◽  
The Public ◽  
Active Involvement ◽  
Total Freedom ◽  
Ideological Identity ◽  
Special Space

The article deals with the phenomenon of theatricalization of the artistic picture of the world in the works of authors-representatives of the group “Bu-Ba-Bu”, (Yuriy Andrukhovych, Viktor Neborak, Oleksandr Irvanets) who carry out a large-scale renewal of Ukrainian literature by dramatizing reality. That is why the mode of theatricality best shows the basic artistic principles of the group (burlesque-balagan-buffoonery). The relevance of the study is due to the need to analyze the work of representatives of Bu-Ba-Bu in the mode of theatricality. The subject of research is the poetic features, the system of characters and the principles of characterization of the group. The purpose of this article is to identify the ideological identity of the literary work of the group “Bu-Ba-Bu” in terms of revealing the theatrical discourse, which provides the research novelty. Research methods: comparative, comparative-historical and descriptive were used. Results of the research. Yu. Andrukhovych’s great prose and O. Irvanets’ drama are considered in the context of the postmodern concept of “theater society”, which treats various forms of social and cultural life as a kind of performance, as well as in connection with the concept of camp, which is characterized by ironic reflection on mass culture and aestheticization of everyday life. Dimensions of theatricality are realized by groups primarily in the form of carnival, which is a means of overcoming postcolonial trauma and a special space of existence (active involvement of the public in theatrical action, blurring the line between “theater” and real life). Addressing the main tenets of Bakhtin’s theory of carnival revealed the peculiarities of the aesthetics of “crisis periods” in prose and drama of modern authors (opposition to official discourses, total freedom and familiarity, accentuation of the bodily “bottom”). Particular attention is paid to corporeality, which reveals carnival features (grotesqueness, fluidity, dynamism) and at the same time becomes a means of rehabilitating human freedom and vitalistic energy, correlating with postcolonial social context. It is proved that the national originality of artists’ creativity is manifested primarily in the constructive nature of the carnival, which, formally correlated with the rhizome, implicitly affirms the value vertical.

Some applications of electron beam microanalysis techniques in VLSI process evaluation

1983 ◽  
Vol 41 ◽  
pp. 160-161
Author(s):  
Simon Thomas
Keyword(s):  
Integrated Circuits ◽  
Process Evaluation ◽  
Large Scale ◽  
Technology Development ◽  
Analytical Techniques ◽  
Successful Implementation ◽  
Analysis Of Failures ◽  
Characterization Of Materials ◽  
Circuits Vlsi

Trends in the technology development of very large scale integrated circuits (VLSI) have been in the direction of higher density of components with smaller dimensions. The scaling down of device dimensions has been not only laterally but also in depth. Such efforts in miniaturization bring with them new developments in materials and processing. Successful implementation of these efforts is, to a large extent, dependent on the proper understanding of the material properties, process technologies and reliability issues, through adequate analytical studies. The analytical instrumentation technology has, fortunately, kept pace with the basic requirements of devices with lateral dimensions in the micron/ submicron range and depths of the order of nonometers. Often, newer analytical techniques have emerged or the more conventional techniques have been adapted to meet the more stringent requirements. As such, a variety of analytical techniques are available today to aid an analyst in the efforts of VLSI process evaluation. Generally such analytical efforts are divided into the characterization of materials, evaluation of processing steps and the analysis of failures.

Characterization of seawater reverse osmosis fouled membranes from large scale commercial desalination plant

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Reverse Osmosis ◽  
Large Scale ◽  
Retention Rate ◽  
Local Level ◽  
Microscopic Analysis ◽  
Transmembrane Pressure ◽  
Hydraulic Permeability ◽  
Seawater Reverse Osmosis ◽  
A Chain

The objective of this work is to study the ageing state of a used reverse osmosis (RO) membrane taken in Algeria from the Benisaf Water Company seawater desalination unit. The study consists of an autopsy procedure used to perform a chain of analyses on a membrane sheet. Wear of the membrane is characterized by a degradation of its performance due to a significant increase in hydraulic permeability (25%) and pressure drop as well as a decrease in salt retention (10% to 30%). In most cases the effects of ageing are little or poorly known at the local level and global measurements such as (flux, transmembrane pressure, permeate flow, retention rate, etc.) do not allow characterization. Therefore, a used RO (reverse osmosis) membrane was selected at the site to perform the membrane autopsy tests. These tests make it possible to analyze and identify the cause as well as to understand the links between performance degradation observed at the macroscopic scale and at the scale at which ageing takes place. External and internal visual observations allow seeing the state of degradation. Microscopic analysis of the used membranes surface shows the importance of fouling. In addition, quantification and identification analyses determine a high fouling rate in the used membrane whose foulants is of inorganic and organic nature. Moreover, the analyses proved the presence of a biofilm composed of protein.

Characterization of Interconnect Defects Using Scanning Thermal Conductivity Microscopy

2004 ◽  
Author(s):  
H.W. Ho ◽  
J.C.H. Phang ◽  
A. Altes ◽  
L.J. Balk
Keyword(s):  
Thermal Conductivity ◽  
Integrated Circuits ◽  
Large Scale

Abstract In this paper, scanning thermal conductivity microscopy is used to characterize interconnect defects due to electromigration. Similar features are observed both in the temperature and thermal conductivity micrographs. The key advantage of the thermal conductivity mode is that specimen bias is not required. This is an important advantage for the characterization of defects in large scale integrated circuits. The thermal conductivity micrographs of extrusion, exposed and subsurface voids are presented and compared with the corresponding topography and temperature micrographs.

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