Acoustic Evaluation of Annulus B Barriers Through Tubing for Plug and Abandonment Job Planning

2021 ◽  
Author(s):  
Sandip Bose ◽  
Lingchen Zhu ◽  
Smaine Zeroug ◽  
Ioan Alexandru Merciu ◽  
Kevin Constable ◽  
...  
Keyword(s):  
Machine Learning ◽  
Complex Relationship ◽  
Well Bore ◽  
Learning To Learn ◽  
Single Feature ◽  
Need To Evaluate ◽  
Acoustic Evaluation ◽  
Modeling And Experiments ◽  
Complex Scenario ◽  
Relationship Of

Abstract The need to evaluate cement behind multiple casing strings has become critical in the context of well plug and abandonment (P&A) or slot recovery. A particularly important case, addressed in this work, is the application to optimize P&A operations in offshore wells where the capability to evaluate barriers behind casing using tools deployed inside an inner tubing would reduce the costs associated with rig time and potentially (in case the presence of barriers outside the casing is confirmed) the unnecessary removal of casing strings. We present an approach using a combination of sonic and ultrasonic tools deployed inside tubing to characterize the near well bore environment and in particular, the annular fill and bond behind the outer casing, i.e. in annulus B. Extensive modeling and experiments were used to characterize the sonic response in a dual string geometry and identify features that inform on the state of annulus B. Some of the complexities and ambiguities in this complex scenario are addressed by using the ultrasonic tool to characterize the annulus behind the tubing (annulus A) as well as the tubing location inside the casing. Additionally, we combine the single feature answers with those using deep machine learning to learn the complex relationship of the subtle features in the through tubing sonic response to the finer variations of the annulus B state as indicated by ultrasonic cement maps acquired in the outer casing. We test and validate these answers on a number of field jobs and show the results of the through-tubing logging answers with the reference cement evaluation maps obtained after removing the tubing.

scholarly journals Adaptive quantum state tomography with neural networks

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Yihui Quek ◽  
Stanislav Fort ◽  
Hui Khoon Ng
Keyword(s):  
Machine Learning ◽  
Quantum State ◽  
The State ◽  
Learning To Learn ◽  
Seamless Integration ◽  
Quantum State Tomography ◽  
Flexible Machine ◽  
Meta Learning ◽  
Long Time ◽  
State Tomography

AbstractCurrent algorithms for quantum state tomography (QST) are costly both on the experimental front, requiring measurement of many copies of the state, and on the classical computational front, needing a long time to analyze the gathered data. Here, we introduce neural adaptive quantum state tomography (NAQT), a fast, flexible machine-learning-based algorithm for QST that adapts measurements and provides orders of magnitude faster processing while retaining state-of-the-art reconstruction accuracy. As in other adaptive QST schemes, measurement adaptation makes use of the information gathered from previous measured copies of the state to perform a targeted sensing of the next copy, maximizing the information gathered from that next copy. Our NAQT approach allows for a rapid and seamless integration of measurement adaptation and statistical inference, using a neural-network replacement of the standard Bayes’ update, to obtain the best estimate of the state. Our algorithm, which falls into the machine learning subfield of “meta-learning” (in effect “learning to learn” about quantum states), does not require any ansatz about the form of the state to be estimated. Despite this generality, it can be retrained within hours on a single laptop for a two-qubit situation, which suggests a feasible time-cost when extended to larger systems and potential speed-ups if provided with additional structure, such as a state ansatz.

Nature, Nation, Science and Gender

2018 ◽  
Vol 67 (3) ◽  
pp. 334-347
Author(s):  
Gita Chadha
Keyword(s):  
Symbiotic Relationship ◽  
Complex Relationship ◽  
Mother Goddess ◽  
Indian Scientist ◽  
Feminist Perspectives ◽  
And Gender ◽  
Relationship Of ◽  
The Relationship

The article explores the equation among nature, nation and gender in the nationalist context. Developing the argument that both nature and nation were feminised and deified as mother and mother goddess in the nationalist context, the article deploys feminist perspectives to critically examine this on a fourth-axis science. By looking at the relationship of the scientist, J. C. Bose, to these categories, the article hopes to unravel the complex relationship of the Indian scientist to nation, nature, gender and science. It is argued that due to being a ‘Sakta’, Bose had a symbiotic relationship to nature, and consequently to science, thereby presenting an ‘alternative’ to Western modes of relating to science and nature. The article submits that this alternative was cast in patriarchal constructions of both science and nature and views the associations of mother with nation and nature within larger feminist critiques of science. The article submits that while these sleeping metaphors set an alternative paradigm to the Western modes of relating to nature through science, they reproduced patriarchal constructions of the same. The article is an effort at grafting feminist perspectives on (a) science and (b) nationalism with postcolonial perspectives on science and modernity.

scholarly journals Alegropolis: Wakanda and Black Panther’s Hall of Mirrors

2020 ◽  
Vol 7 (2) ◽  
pp. 121-135 ◽  
Author(s):  
Ananya Jahanara Kabir
Keyword(s):  
African American ◽  
Atlantic History ◽  
Complex Relationship ◽  
African Continent ◽  
Collective Memories ◽  
Black Panthers ◽  
Relationship Of ◽  
Black Panther

The climax of the film Black Panther (directed by Ryan Coogler, 2018) shows the two heirs claiming the Black Panther’s mantle battling it out in a tunnel that is modernity's dark hull. My article teases out the complex relationship between the film’s doubled Black Panthers as a hall of mirrors, where the African American filmmaker and the assembled African and Afro-diasporic cast confront each other, their collective memories of slavery, and the complex relationship of those on the African continent to those memories. What in the structure of cinema might take us out of this hall of mirrors to a futurity beyond trauma? In answer, I offer a reading of Wakanda as “Alegropolis”: a lavish and loving cinematic creation that draws on Afro-Futurist play with temporality and technology to reinscribe this circum-Atlantic history within a planetary frame. An affiliative afro-modernity is generated thereby, which invites a global audience to share the film’s ethical and emotional concerns as what Michael Rothberg calls “implicated subjects.”

scholarly journals Migration and Citizenship in “Athens of Crisis”

2018 ◽  
Vol 1 (1) ◽  
pp. 127-134
Author(s):  
Aris Komporozos-Athanasiou ◽  
Nina Papachristou
Keyword(s):  
International Organizations ◽  
Support Services ◽  
Support Networks ◽  
Government Support ◽  
Complex Relationship ◽  
Refugee Crisis ◽  
Governmental Organizations ◽  
Non Governmental Organizations ◽  
Relationship Of ◽  
The Relationship

In this interview with UCL’s Aris Komporozos-Athanasiou, Lefteris Papagiannakis explains his role as Athens’ vice mayor for migrants and refugees. He discusses the city’s responses to the arrival of thousands of refugees and migrants in the last few years. He reflects on the complex relationship of the municipality of Athens with non-government support networks, such as non-governmental organizations (NGOs), international organizations, as well as autonomous local activists, in providing support services to migrants. Papagiannakis also addresses how Athens negotiates its support for these groups in the current European anti-immigrant climate, and the relationship between the Greek economic crisis and the so-called “refugee crisis.”

scholarly journals Automatic pathology classification using a single feature machine learning support - vector machines

2014 ◽  
Author(s):  
Fernando Yepes-Calderon ◽  
Fabian Pedregosa ◽  
Bertrand Thirion ◽  
Yalin Wang ◽  
Natasha Lepore
Keyword(s):  
Machine Learning ◽  
Support Vector Machines ◽  
Support Vector ◽  
Learning Support ◽  
Pathology Classification ◽  
Single Feature ◽  
Vector Machines

scholarly journals DSSMFM: Combining user and item feature interactions for recommendation systems

2020 ◽  
Vol 309 ◽  
pp. 03010
Author(s):  
Weishan Zeng
Keyword(s):  
Machine Learning ◽  
Recommendation Systems ◽  
Machine Learning Algorithms ◽  
Model Data ◽  
New Model ◽  
Feature Interactions ◽  
Short Video ◽  
Item Attributes ◽  
Relationship Of ◽  
The Relationship

Effort has been done to optimize machine learning algorithms by applying relevant knowledges in data fields in recommendation systems. Ways are explored to discover the relationship of features independently, making the model more effective and robust. A new model, DSSMFM is proposed in this paper which combines user and item features interactions to improve the performance of recommendation systems. In this model, data are divided into user features and item features represented by one-hot vectors. The pre-training for the model is proceeded through FM, and implicit vectors are obtained for both user and item features. The implicit vectors are used as the input of DSSM, and the training of the DSSM part of the model will maximize the cosine distances of the user attributes vectors and the item attributes vectors. According to the experimental results on dataset of ICME 2019 Short Video Understanding and Recommendation Challenge, the model shows improvements on some results of the baselines.

Do Not Forbid Nietzsche to Minors: On Deleuze's Symptomatological Thought

2019 ◽  
Vol 13 (4) ◽  
pp. 552-566
Author(s):  
Paolo Vignola
Keyword(s):  
Twentieth Century ◽  
Complex Relationship ◽  
The Core ◽  
Conditions Of Possibility ◽  
Relationship Of

The paper aims to describe the stakes of a Nietzschean influence on Deleuze's reflections on the transcendental and conversely to highlight the Deleuzian operation of politicising Nietzsche by ‘minorising’ him. In order to further understand such a complex relationship of becoming between Deleuze and Nietzsche, the first objective of the paper is to focus on active and reactive forces, which seem to be the core of this very relation. Thus, the paper suggests that micropolitics has its conditions of possibility in the Nietzschean corpus and, in particular, in the symptomatology of decadence, resentment and nihilism. In this sense, now the title of the paper reveals its meaning: the whole Deleuzian operation could be summarised as the passage from the criticism and questioning of an image of Nietzsche ‘forbidden to minors’ (especially for its presumed political dangerousness and alleged discrediting of minorities), typical of the interpretations of the first half of the twentieth century, to a becoming-minor of these very same Nietzschean concepts. It is precisely through such a becoming-minor that Nietzsche's diagnosis and concepts are translated in a political and emancipatory key, in order to give power to minorities.

Hesiod and the Visual Arts

2018 ◽  
Author(s):  
H. A. Shapiro
Keyword(s):  
Visual Arts ◽  
Archaic Period ◽  
Test Case ◽  
Complex Relationship ◽  
Vase Painting ◽  
Visual Artists ◽  
Text And Image ◽  
Major Work ◽  
The Individual ◽  
Relationship Of

This chapter explores the influence of Hesiod’s Theogony on Greek visual artists of the archaic period (ca. 700–480 bce). Since dozens of divinities and heroes mentioned in the poem appear in sculpture and (more often) vase painting and cannot be systematically treated, one major work with strong Hesiodic associations is examined as a test case. The Attic black-figure dinos signed by the painter Sophilos and dated ca. 580 bce includes more than thirty gods and goddesses participating in the wedding of Peleus and Thetis, future parents of Achilles. All of these can be found in the Theogony, and the poem can be a helpful guide to understanding how the individual figures are placed in the procession. The unique depiction of Okeanos on the dinos illustrates especially well the complex relationship of text and image.

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