Analytical, Numerical and Experimental Study of the Vibro-Acoustic Behaviour of a Stiffened Shell Structure

1995 ◽  
Author(s):  
François Charron ◽  
Raymond Panneton ◽  
Yvan Champoux ◽  
J.-M. Guérin ◽  
Sylvain Boily
Keyword(s):  
Ritz Method ◽  
Scale Model ◽  
Acoustic Behaviour ◽  
Initial Correlation ◽  
Measuring Techniques ◽  
Depth Study ◽  
Proper Definition ◽  
Definition Of ◽  
Analytical Approaches ◽  
Airplane Fuselage

Abstract The main objectives of this study are a better understanding of the vibro-acoustic behaviour of an airplane fuselage type structure including stiffeners and a better comprehension of the measuring techniques and the modelization approaches for this type of problem. In order to meet the above objectives, three different models were developed. The first one is an experimental model where the measured accelerations and acoustic pressures are used as a reference for the validation of predicted results. The second model is based on a semi-analytical approach. This model is derived from variational and integral approaches and solved, approximately using a Rayleigh-Ritz method. Finally, the last model is based on the finite element method. Several iterations have been necessary before reaching an excellent agreement between all three approaches, especially regarding acoustic responses. From the initial correlation between the measured and predicted results, two major problems were identified. The first one is related to convergence problem associated with the semi-analytical model when stiffeners are incorporated in the model. The second problem is associated with the proper definition of the fluid-structure intermodal coupling in the numerical and analytical approaches. This paper will present the various approaches and models. Furthermore, the investigation on the previous problems will be discussed in detail. In conclusion, new modelization limitations were identified and new modelization criteria for the intermodal coupling were developed from the present study. These results will be used for an in-depth study on the vibro-acoustic behaviour of 1/3 scale model of airplane fuselage.

Simultaneous heat and mass transfer during evaporation from a film of liquid into the turbulent gas

1982 ◽  
Vol 47 (3) ◽  
pp. 766-775 ◽  
Author(s):  
Václav Kolář ◽  
Jan Červenka
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Liquid Film ◽  
Heat And Mass Transfer ◽  
Driving Forces ◽  
Proper Definition ◽  
Definition Of ◽  
Simultaneous Heat ◽  
Theory And Experiment

The paper presents results obtained by processing a series of published experimental data on heat and mass transfer during evaporation of pure liquids from the free board of a liquid film into the turbulent gas phone. The data has been processed on the basis of the earlier theory of mechanism of heat and mass transfer. In spite of the fact that this process exhibits a strong Stefan's flow, the results indicate that with a proper definition of the driving forces the agreement between theory and experiment is very good.

WoCoVA consensus on the clinical use of in-line filtration during intravenous infusions: Current evidence and recommendations for future research

2021 ◽  
pp. 112972982198916
Author(s):  
Ton Van Boxtel ◽  
Mauro Pittiruti ◽  
Annemarie Arkema ◽  
Patrick Ball ◽  
Giovanni Barone ◽  
...  
Keyword(s):  
Potential Benefit ◽  
Scientific Evidence ◽  
Venous Access ◽  
Current Evidence ◽  
Future Research ◽  
Global Awareness ◽  
Current State ◽  
Intravenous Infusions ◽  
Proper Definition ◽  
Definition Of

The need for filtering intravenous infusions has long been recognized in the field of venous access, though hard scientific evidence about the actual indications for in-line filters has been scarce. In the last few years, several papers and a few clinical studies have raised again this issue, suggesting that the time has come for a proper definition of the type of filtration, of its potential benefit, and of its proper indications in clinical practice. The WoCoVA Foundation, whose goal is to increase the global awareness on the risk of intravenous access and on patients’ safety, developed the project of a consensus on intravenous filtration. A panel of experts in different aspects of intravenous infusion was chosen to express the current state of knowledge about filtration and to indicate the direction of future research in this field. The present document reports the final conclusions of the panel.

Artificially making Lifeform

2021 ◽  
Vol 9 (10) ◽  
pp. 1290-1295
Author(s):  
Souvik Das
Keyword(s):  
Medical Community ◽  
Programming Algorithm ◽  
The Public ◽  
For Profit ◽  
Not For Profit ◽  
Funding Agencies ◽  
Proper Definition ◽  
Inanimate Matter ◽  
Living Organisms ◽  
Definition Of

Abstract: The word ‘life’ is a mysterious word with a chart of attributes that have neither been completed nor has been agreed upon by the race of humans. Probably the proper definition of life is impossible to identify for humans (the proof for this claim is given later) but the handbook to the secret shall be updated till the end, thanks to the inquisitive attitude of humans. For this piece, we shall adopt the description from the professional medical community of today. Though this topic falls midway between science and philosophy, this project is strictly technical. To quote dictionary.com, Life is the condition that distinguishes organisms from inorganic objects and dead organisms, being manifested by growth through metabolism, reproduction and the power of adaptation to environment- through changes originating internally; cambridge.com teaches Life is the period between birth and death, or the experience or state of being alive; medicaldictionary.thefreedictionary.com states Life is the property or quality that distinguishes living organisms from dead organisms and inanimate matter, manifested in functions such as metabolism, growth, reproduction and response to stimuli or adaptation to the environment originating from within the organisms. There are several other definitions but to summarize, we can safely state that though the concept is somewhat vague, we could indeed point out some common principles. We shall, in this project, try to replicate the characteristics so as to attain life in medical terms. (The order does not base upon importance of the listed character since the characters, all of them are absolute essentials and cannot possibly be categorized as more or less important). 1) Metabolism 2) Growth 3) Adaptability 4) Birth 5) Death 6) Self-stimulated response to environment 7) Reproduction 8) Can sustain self without foreign intervention Keywords: artificial, life, intelligence, computer, programming, algorithm This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

TRADE TASKS BETWEEN MANUFACTURERS AND CONSUMERS CONNECTION STATE

2021 ◽  
Vol 4 (2) ◽  
pp. 24-31
Author(s):  
Nargiz Sattarova ◽  
Keyword(s):  
Economic Transformation ◽  
Economic Entity ◽  
Effective Operation ◽  
Depth Study ◽  
Definition Of ◽  
Favorable Conditions ◽  
Current Stage

This article presents the definitions of the concept of trade services by various scientists, the place and role of trade services in all spheres and sectors of society, as well as a new definition of trade services given by the author.If the main goal of the current stage of economic transformation is to create favorable conditions for the effective operation of trade enterprises, then the main goal of the article is an in-depth study of the essence and content of the concept of trade services as an independent economic entity.

scholarly journals Lean & Green on Industry 4.0 Context – Contribution to Understand L&G Drivers and Design Principles

2021 ◽  
Vol 6 (5) ◽  
pp. 1214-1229
Author(s):  
Lenin John ◽  
Manuel Sampayo ◽  
Paulo Peças
Keyword(s):  
Industry 4.0 ◽  
Research Work ◽  
Design Principles ◽  
Manufacturing Companies ◽  
Bottom Line ◽  
Industrial Firms ◽  
Systems Implementation ◽  
Sustainability Concept ◽  
Proper Definition ◽  
Definition Of

The purpose of this paper is to demonstrate how the implementation of Lean & Green (L&G) in an Industry 4.0 (I4.0) environment can enhance the potential impact of the L&G approach and help manufacturing companies moving towards higher operational and sustainable performances. The research work developed here shows that although a proper definition of L&G is neither exposed worldwide nor explicitly implemented under that name, the current industrial firms are deeply concerned about the demanding challenge of keeping businesses flexible and agile without forgetting strategies to minimize the acceleration of climate change. So, one contribution of this paper is the identification and characterization of L&G drivers and design principles, supporting a robust and well-informed L&G systems implementation. As inferred from the research work, this challenge demands high quality and updated data together with assertive information. Thus, the implementation of L&G in I4.0 contexts is the answer to overcome the identified barriers. Likewise, an L&G system contributes to overcoming the challenges of I4.0 implementation regarding the triple bottom line sustainability concept. Consequently, another contribution of this paper is to depict why an L&G system performs better in the I4.0 context.

scholarly journals Reconstructing the Contours of the Copyright Originality and Idea- Expression Doctrines Regarding the Right to Deny Access to Works

2014 ◽  
Vol 1 (4) ◽  
pp. 921-940
Author(s):  
Michael D. Murray
Keyword(s):  
First Amendment ◽  
Freedom Of Expression ◽  
Cultural Knowledge ◽  
Fair Use ◽  
Digital Revolution ◽  
Content Development ◽  
Proper Definition ◽  
Definition Of ◽  
Access To Knowledge ◽  
The Right

ccess to innovative scientific, literary, and artistic content has never been more important to the public than now, in the digital age. Thanks to the digital revolution carried out through such means as super-computational power at super-affordable prices, the Internet, broadband penetration, and contemporary computer science and technology, the global, national, and local public finds itself at the convergence of unprecedented scientific and cultural knowledge and content development, along with unprecedented means to distribute, communicate, and access that knowledge. This Article joins the conversation on the Access-to-Knowledge, Access-to- Medicine, and Access-to-Art movements by asserting that the copyright restrictions affecting knowledge, innovation, and original thought implicate copyright’s originality and idea-expression doctrines first and fair use doctrine second. The parallel conversation in copyright law that focuses on the proper definition of the contours of copyright as described in the U.S. Supreme Court’s most recent constitutional law cases on copyright—Feist, Eldred, Golan, and Kirtsaeng—interprets the originality and idea-expression doctrines as being necessary for the proper balance between copyright protection and First Amendment freedom of expression. This Article seeks to join together the two conversations by focusing attention on the right to access published works under both copyright and First Amendment law. Access to works is part and parcel of the copyright contours debate. It is a “first principles” question to be answered before the question of manipulation, appropriation, or fair use is contemplated. The original intent of the Copyright Clause and its need to accommodate the First Amendment freedom of expression support the construction of the contours of copyright to include a right to access knowledge and information. Therefore, the originality and idea-expression doctrines should be reconstructed to recognize that the right to deny access to published works is extremely limited if not non-existent within the properly constructed contours of copyright.

scholarly journals Ki vagyok én? - Szárnyas fejvadász 2049

2020 ◽  
Vol 10 (21) ◽  
pp. 307-312
Author(s):  
Pál Gerdesits
Keyword(s):  
Michel Foucault ◽  
Jacques Derrida ◽  
Self Identity ◽  
Ferdinand De Saussure ◽  
Blade Runner ◽  
Jean Paul ◽  
Proper Definition ◽  
Definition Of ◽  
Philosophical Questions

My essay focuses on the ontological crisis articulated in the film Blade Runner 2049, the sequel for Ridley Scott’s Blade Runner. This film is based on the conflict between humans and androids called replicants who would like to live equally to humans. In my opinion the root of their opposition lies on the inability to give a proper definition of what we normally call ‘human’. In this writing I present and analyse the nature of this conflict and also the philosophical questions (representation, freedom, self-identity etc.) arising from it based on the ideas of philosophers like Michel Foucault. Jean-Paul Sartre, Jacques Derrida and Ferdinand de Saussure.

scholarly journals Innovative start-ups and young entrepreneurs: Definition of venture capital and findings from Switzerland

2017 ◽  
Vol 7 (1) ◽  
pp. 75-81
Author(s):  
Simon Zaby
Keyword(s):  
Venture Capital ◽  
Success Factors ◽  
Total Sample ◽  
Venture Capitalists ◽  
Flow Of Funds ◽  
Start Up ◽  
Capital Financing ◽  
Proper Definition ◽  
Definition Of ◽  
Start Ups

This paper aims to investigate success factors of innovative start-up firms from the perspective of young start-up managers. Which key factors did they experience before and since the foundation of their company? The experience from the quite young Swiss start-up scene pro-vides important insights to entrepreneurs and policy-makers in emerging countries that cur-rently face the necessity of building up a start-up environment. One part of the data has been collected by the author, the other part originates from the Swiss Venture Capital Database (total sample size: 306). The results show a significant role of venture capital financing for the success of innovative start-ups. Interestingly, this is to some extent because the start-ups see various additional benefits from venture capitalists involved in their firm. Thus, the findings shed new light on a proper definition of venture capital that should not solely focus on the flow of funds.

The Judge as Paterfamilias

2019 ◽  
pp. 331-349
Author(s):  
Gerald J. Postema
Keyword(s):  
Decision Making ◽  
Common Law ◽  
Judicial Decision ◽  
Judicial Decision Making ◽  
Proper Understanding ◽  
Abuse Of Power ◽  
Radical Critique ◽  
Proper Definition ◽  
Definition Of ◽  
Utilitarian Theory

Following his radical critique of Common Law, both as a system of laws and as a theory of adjudication, Bentham embarked on a career-long attempt to produce an alternative which more adequately meets the criteria of his background utilitarian theory. This chapter focuses on his theory of adjudication. In his view, the proper definition of the judicial role and a proper understanding of the nature, scope, and limits of judicial decision-making could only be achieved by attempting to solve central problems of the design of adjudicative institutions and procedures. The principle on which he based his construction of adjudicative institutions was drawn from his analysis of the defects of Common Law, especially his view that it is self-defeating to attempt to structure judicial decision-making by means of fixed rules in order to constrain arbitrariness and abuse of power.

Profiling of Web Services to Measure and Verify their Non-Functional Properties

2010 ◽  
pp. 96-113 ◽  
Author(s):  
Witold Abramowicz
Keyword(s):  
Web Services ◽  
Functional Properties ◽  
Focus Of Attention ◽  
Adaptive Services ◽  
Proper Definition ◽  
Definition Of ◽  
The Eu

The following chapter focuses on the problem of the proper definition of non-functional properties and methods that may be applied in order to estimate their values. First of all, a reader is familiarized with the concept of non-functional properties and different views on the quality of Web services. Then, selected approaches to obtain values of non-functional properties are presented. The focus of attention is Web services profiling that seems to be one of the most promising methods to perform this task. The framework presented in this chapter was implemented and tested within the EU Adaptive Services Grid project.

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