scholarly journals Numerical Simulation of Closing Process of Shuttle Check Valve

2015 ◽  
Vol 9 (1) ◽  
pp. 714-720 ◽  
Author(s):  
Xiang Kefeng ◽  
Yao Jin ◽  
Zeng Xiangwei
Keyword(s):  
Pressure Fluctuations ◽  
Fluid Pressure ◽  
Check Valve ◽  
Geometrical Model ◽  
Pressure Curve ◽  
Design And Optimization ◽  
The Core ◽  
Speed Fluctuation ◽  
Fluent Software ◽  
The Moment

For studying the kinetic characteristics of passive shuttle check valve at the moment that it closes its valve core on the condition of high pressure differences, this paper first constructs the equation of motion of the valve core and twodimensional geometrical model by using computation fluid dynamics method, then with the help of the calculation method and physical model provided by Fluent software, employing the dynamic mesh and user-defined functions, simulates the unsteady flow in the valve core’s closing process under the different pressure fluctuations, and obtains the stress nephogram, the velocity vector diagram, the speed curve, and pressure curve of the interior flow field of the valve. The results show that the bigger the value of valve fluctuation is, the larger the fluid pressure that the valve core is subjected to, the openness of the core and the speed fluctuation of the core are, and that in the case of sudden decompression at the entrance, the core can be shut down quickly with the steady speed field and pressure field. The simulation results are conducive to the design and optimization of structure parameter of shuttle check valve.

The Final ‘Thank You’

Derrida Today ◽  
2010 ◽  
Vol 3 (1) ◽  
pp. 21-36
Author(s):  
Grant Farred
Keyword(s):  
South Africa ◽  
South African ◽  
Jacques Derrida ◽  
Political Transition ◽  
The Other ◽  
World Cup ◽  
The Core ◽  
Nelson Mandela ◽  
Black President ◽  
The Moment

‘The Final “Thank You”’ uses the work of Jacques Derrida and Friedrich Nietzsche to think the occasion of the 1995 rugby World Cup, hosted by the newly democratic South Africa. This paper deploys Nietzsche's Zarathustra to critique how a figure such as Nelson Mandela is understood as a ‘Superman’ or an ‘Overhuman’ in the moment of political transition. The philosophical focus of the paper, however, turns on the ‘thank yous’ exchanged by the white South African rugby captain, François Pienaar, and the black president at the event of the Springbok victory. It is the value, and the proximity and negation, of the ‘thank yous’ – the relation of one to the other – that constitutes the core of the article. 1

The Home at the core of Modernity, an optimistic architecture

2021 ◽  
pp. 2-3
Author(s):  
Ana Tostões
Keyword(s):  
Daily Life ◽  
Single Family ◽  
The Core ◽  
The Moment ◽  
Definition Of ◽  
The Ideal ◽  
Modern Movement

Devoted to the theme of single-family houses, given the key role they played in the ideal definition of the Modern Movement architecture, as a symbolic and functional affirmation of the utopian turning of dreams into reality, the aim of this issue is to consider the transformation of daily life, and to address the architectural challenges that arose from the joy contained in what we might call the “architecture of happiness.” As we continue to endure a pandemic that has now lasted for more than a year, docomomo wishes to declare that “till the moment, the best vaccine to prevent contagion was invented by architects: the house”. Thus, in response to the question “How should we live?”, it is intended to debate the house and the home agenda as an important topic at the core of Modern Movement architecture. Nowadays, the growing emphasis on wellbeing goes beyond the seminal ideas that modern houses were “machines à habiter” and is closer to an idealistic vision of a stimulating shell for humans, which is shaped by imagination, experimentation, efficiency, and knowledge.

Some pressure and fluid dynamic characteristics of the canine epidural space

1977 ◽  
Vol 232 (3) ◽  
pp. H255-H259
Author(s):  
R. G. Bengis ◽  
A. C. Guyton
Keyword(s):  
Epidural Space ◽  
Fluid Dynamic ◽  
Fluid Pressure ◽  
Simultaneous Recording ◽  
Positive Pressure ◽  
Pressure Curve ◽  
Epidural Pressure ◽  
Volume Depletion ◽  
Significant Drop ◽  
Epidural Catheters

Pressure measured in teh epidural space of 50 dogs was consistently negative (subatmospheric). Acutely implanted epidural catheters gave an average reading of -2.72 mmHg (n = 44, SE = 0.18), whereas chronically implanted catheters gave more negative readings, averaging -5.8 mmHg (n = 6, SE = 0.49). Since the chronically implanted catheters permit healing, resolution of hemorrhage, and resealing of the epidural space to take place, resulting in equilibration of microcirulatory forces, these readings are believed to represent more closely the true epidural pressure. Also these results approximate closely the calculated and measured interstitial fluid pressures obtained by different techniques in other loose areolar connective tissue systems. Compliance studies, using a double-lumen catheter for simultaneous recording and infusing in the epidural space, showed increasing compliance as the pressure rose into the positive pressure range, with an eventual plateau of the volume-pressure curve at the level of the concomitantly measured cerebrospinal fluid pressure (avg = +5.73 mmHg, n = 10, SE = 0.48). Intravenous volume loading using Tyrode solution caused a large rise in epidural pressure, and volume depletion with diuretics caused a significant drop in epidural pressure.

scholarly journals An Analysis of Current Trends in CBR Research Using Multi-View Clustering

AI Magazine ◽  
2010 ◽  
Vol 31 (2) ◽  
pp. 45 ◽  
Author(s):  
Derek Greene ◽  
Jill Freyne ◽  
Barry Smyth ◽  
Pádraig Cunningham
Keyword(s):  
Case Based Reasoning ◽  
Research Papers ◽  
The Core ◽  
Current Trends ◽  
Research Challenges ◽  
Core Set ◽  
Research Themes ◽  
Promising Application ◽  
The Moment ◽  
Case Based

The European Conference on Case-Based Reasoning (CBR) in 2008 marked 15 years of international and European CBR conferences where almost seven hundred research papers were published. In this report we review the research themes covered in these papers and identify the topics that are active at the moment. The main mechanism for this analysis is a clustering of the research papers based on both co-citation links and text similarity. It is interesting to note that the core set of papers has attracted citations from almost three thousand papers outside the conference collection so it is clear that the CBR conferences are a sub-part of a much larger whole. It is remarkable that the research themes revealed by this analysis do not map directly to the sub-topics of CBR that might appear in a textbook. Instead they reflect the applications-oriented focus of CBR research, and cover the promising application areas and research challenges that are faced.

The emergence of the idea of ‘the welfare state’ in British political discourse

2021 ◽  
pp. 095269512110344
Author(s):  
David Garland
Keyword(s):  
Welfare State ◽  
Economic System ◽  
Political Discourse ◽  
The Political ◽  
Political Actors ◽  
The Core ◽  
Post War ◽  
The Moment ◽  
Subsequent Integration ◽  
The Welfare State

This article traces the emergence of the term welfare state in British political discourse and describes competing efforts to define its meaning. It presents a genealogy of the concept's emergence and its subsequent integration into various political scripts, tracing the struggles that sought to name, define, and narrate what welfare state would be taken to mean. It shows that the concept emerged only after the core programmes to which it referred had already been enacted into law and that the referents and meaning of the concept were never generally agreed upon – not even at the moment of its formation in the late 1940s. During the 1950s, the welfare state concept was being framed in three distinct senses: (a) the welfare state as a set of social security programmes; (b) the welfare state as a socio-economic system; and (c) the welfare state as a new kind of state. Each of these usages was deployed by opposing political actors – though with different scope, meaning, value, and implication. The article argues that the welfare state concept did not operate as a representation reflecting a separate, already-constituted reality. Rather, the use of the concept in the political and economic arguments of the period – and in later disputes about the nature of the Labour government's post-war achievements – was always thoroughly rhetorical and constitutive, its users aiming to shape the transformations and outcomes that they claimed merely to describe.

scholarly journals Experimental and Numerical Vibration Analysis of Hydraulic Pipeline System under Multiexcitations

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Peixin Gao ◽  
Hongquan Qu ◽  
Yuanlin Zhang ◽  
Tao Yu ◽  
Jingyu Zhai
Keyword(s):  
Pressure Fluctuations ◽  
Fluid Motion ◽  
Fluid Pressure ◽  
Point Of View ◽  
Pipeline System ◽  
Base Excitation ◽  
Fem Method ◽  
Pipeline Systems ◽  
Pump Pressure ◽  
Improved Model

Pipeline systems in aircraft are subjected to both hydraulic pump pressure fluctuations and base excitation from the engine. This can cause fatigue failures due to excessive vibrations. Therefore, it is essential to investigate the vibration behavior of the pipeline system under multiexcitations. In this paper, experiments have been conducted to describe the hydraulic pipeline systems, in which fluid pressure excitation in pipeline is driven by the throttle valve, and the base excitation is produced by the shaker driven by a vibration controller. An improved model which includes fluid motion and base excitation is proposed. A numerical MOC-FEM approach which combined the coupling method of characteristics (MOC) and finite element method (FEM) is proposed to solve the equations. The results show that the current MOC-FEM method could predict the vibration characteristics of the pipeline with sufficient accuracy. Moreover, the pipeline under multiexcitations could produce an interesting beat phenomenon, and this dangerous phenomenon is investigated for its consequences from engineering point of view.

Object Detection in Fog Computing Using Machine Learning Algorithms

2020 ◽  
pp. 90-107
Author(s):  
Peyakunta Bhargavi ◽  
Singaraju Jyothi
Keyword(s):  
Artificial Intelligence ◽  
Machine Learning ◽  
Object Detection ◽  
Fog Computing ◽  
Machine Learning Algorithms ◽  
Sensor Data ◽  
Core Network ◽  
The Core ◽  
The Moment ◽  
Algorithmic Approaches

The moment we live in today demands the convergence of the cloud computing, fog computing, machine learning, and IoT to explore new technological solutions. Fog computing is an emerging architecture intended for alleviating the network burdens at the cloud and the core network by moving resource-intensive functionalities such as computation, communication, storage, and analytics closer to the end users. Machine learning is a subfield of computer science and is a type of artificial intelligence (AI) that provides machines with the ability to learn without explicit programming. IoT has the ability to make decisions and take actions autonomously based on algorithmic sensing to acquire sensor data. These embedded capabilities will range across the entire spectrum of algorithmic approaches that is associated with machine learning. Here the authors explore how machine learning methods have been used to deploy the object detection, text detection in an image, and incorporated for better fulfillment of requirements in fog computing.

Design and Optimization of Core Balancing Fixture in Vibration Sorting Rig (VSR)

2016 ◽  
Vol 852 ◽  
pp. 568-574
Author(s):  
Karumanchi Vinay Prakash ◽  
R. Bakthavachalam ◽  
M. Senthil Kumar
Keyword(s):  
Work Piece ◽  
Fixture Design ◽  
Cfd Analysis ◽  
Turbine Wheel ◽  
Compressor Wheel ◽  
Rotating Speed ◽  
Design And Optimization ◽  
The Core ◽  
Turbo Charger

This work studies the design of a fixture used in vibration sorting rig which is used for core balancing in turbo charger. The main objective of this paper is to design and optimize the fixture for holding the turbo chargers. To balance the core of turbo charger, turbine wheel and compressor wheel should balance which is turbine wheel is placed into the fixture. This paper analyzes the existing fixture and proposed new design. The fixture runs at higher speeds which is why we have to put the more concentration on the fixture design. The small issue in the fixture design results more problems due to high rotating speed of the turbine wheel of turbo charger. Many of the parts rejects due to poor fixture design. New fixture design is based on several aspects like design of work piece, rotating speed etc. The CFD analysis on the existing and proposed design is carried out. The results obtained were compared with existing fixture design.

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