The Coefficients of Adhesion of Rubber

1948 ◽  
Vol 21 (2) ◽  
pp. 505-515 ◽  
Author(s):  
Pierre Thirion
Keyword(s):  
A Priori ◽  
General Rule ◽  
Scientific Data ◽  
Point Of View ◽  
Theoretical Interpretation ◽  
Complex Nature ◽  
Resistance To Sliding ◽  
Service Conditions ◽  
Solid Bodies ◽  
Pneumatic Tires

Abstract What conclusions can be drawn from all these experiments? Attempts to find a possible relation between the adhesion characteristics and other mechanical properties of rubber have been unsuccessful. Nevertheless, from a purely qualitative point of view alone, the coefficients of adhesion become progressively less sensitive to pressure as the rubber approaches more and more to the solid state. This seems to be a general rule to which there is no exception. The theoretical interpretation of this peculiar property of rubber cannot be discussed within the scope of the present paper; in fact it offers a complicated problem, for scientific data on the behavior of rigid solids in contact are extremely scarce. Theories advanced to explain the external friction of solids are numerous, but none gives a truly complete explanation of the phenomenon. However, it seems probable at least that the peculiar behavior is attributable to the characteristic state of materials with rubberlike properties, i.e., a state intermediate between that of liquids and of solids. There are numerous applications where advantage is taken of the high resistance to sliding of rubber on the surfaces of dry solid bodies. There would be no point in calculating a priori their coefficients of adhesion under service conditions from the results obtained in the present work, for conditions in service are generally of a very complex nature and, also are extremely variable. Pneumatic tires on automobiles are a very good example of such conditions. On the other hand, in applications such as transmission belts and autorail pneumatic tires, which operate under much more uniform conditions, there is reason for believing that systematic tests of this kind might be of some use.

A Fatal Error of Locke’s?

2017 ◽  
Author(s):  
Galen Strawson
Keyword(s):  
Personal Identity ◽  
John Locke ◽  
A Priori ◽  
Point Of View ◽  
Radical Theory ◽  
Single Person

This chapter argues that the unqualified attribution of the radical theory to John Locke is mistaken if we are to take into account the fact that the theory allows for freaks like [Sₓ]. It first considers [I]-transfer without [P]-transfer—that is, [I]-transfer preserving personal identity—before discussing Locke's response to the idea that personal identity might survive [I]-transfer from an a priori point of view. It suggests that [I]-transfer is possible in such a way that the existence of a single Person [P₁] from t₁ to t₂ can successively (and non-overlappingly) involve the existence of two immaterial substances. It also explains how Locke's claim that [I]-transfer is possible opens up the possibility that it could go wrong, in such a way as to lead to injustice. Finally, it examines Locke's notion of “sensible creature,” which refers to a subject of experience who is a person.

scholarly journals Iterative Variable Selection for High-Dimensional Data: Prediction of Pathological Response in Triple-Negative Breast Cancer

Mathematics ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 222
Author(s):  
Juan C. Laria ◽  
M. Carmen Aguilera-Morillo ◽  
Enrique Álvarez ◽  
Rosa E. Lillo ◽  
Sara López-Taruella ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Variable Selection ◽  
Triple Negative Breast Cancer ◽  
Triple Negative ◽  
A Priori ◽  
Simulated Data ◽  
Point Of View ◽  
High Dimensional ◽  
Whole Genome ◽  
Genome Context

Over the last decade, regularized regression methods have offered alternatives for performing multi-marker analysis and feature selection in a whole genome context. The process of defining a list of genes that will characterize an expression profile remains unclear. It currently relies upon advanced statistics and can use an agnostic point of view or include some a priori knowledge, but overfitting remains a problem. This paper introduces a methodology to deal with the variable selection and model estimation problems in the high-dimensional set-up, which can be particularly useful in the whole genome context. Results are validated using simulated data and a real dataset from a triple-negative breast cancer study.

ON ROBERTS’ PROOF OF THE TURAEV-WALKER THEOREM

1996 ◽  
Vol 05 (04) ◽  
pp. 427-439 ◽  
Author(s):  
RICCARDO BENEDETTI ◽  
CARLO PETRONIO
Keyword(s):  
Euler Characteristic ◽  
A Priori ◽  
Algebraic Approach ◽  
Fusion Rule ◽  
Point Of View ◽  
Witten Invariant ◽  
Manifolds With Boundary ◽  
3 Dimensional ◽  
Skein Theory ◽  
Natural Way

In this paper we discuss the beautiful idea of Justin Roberts [7] (see also [8]) to re-obtain the Turaev-Viro invariants [11] via skein theory, and re-prove elementarily the Turaev-Walker theorem [9], [10], [13]. We do this by exploiting the presentation of 3-manifolds introduced in [1], [4]. Our presentation supports in a very natural way a formal implementation of Roberts’ idea. More specifically, what we show is how to explicitly extract from an o-graph (the object by which we represent a manifold, see below), one of the framed links in S3 which Roberts uses in the construction of his invariant, and a planar diagrammatic representation of such a link. This implies that the proofs of invariance and equality with the Turaev-Viro invariant can be carried out in a completely “algebraic” way, in terms of a planar diagrammatic calculus which does not require any interpretation of 3-dimensional figures. In particular, when proving the “term-by-term” equality of the expansion of the Roberts invariant with the state sum which gives the Turaev-Viro invariant, we simultaneously apply several times the “fusion rule” (which is formally defined, strictly speaking, only in diagrammatic terms), showing that the “braiding and twisting” which a priori may exist on tetrahedra is globally dispensable. In our point of view the success of this formal “algebraic” approach witnesses a certain efficiency of our presentation of 3-manifolds via o-graphs. In this work we will widely use recoupling theory which was very clearly exposed in [2], and therefore we will avoid recalling notations. Actually, for the purpose of stating and proving our results we will need to slightly extend the class of trivalent ribbon diagrams on which the bracket can be computed. We also address the reader to the references quoted in [2], in particular for the fundamental contributions of Lickorish to this area. In our approach it is more natural to consider invariants of compact 3-manifolds with non-empty boundary. The case of closed 3-manifolds is included by introducing a correction factor corresponding to boundary spheres, as explained in §2. Our main result is actually an extension to manifolds with boundary of the Turaev-Walker theorem: we show that the Turaev-Viro invariant of such a manifold coincides (up to a factor which depends on the Euler characteristic) with the Reshetikhin-Turaev-Witten invariant of the manifold mirrored in its boundary.

scholarly journals The Regularized Weak Functional Matching Pursuit for linear inverse problems

2019 ◽  
Vol 27 (3) ◽  
pp. 317-340 ◽  
Author(s):  
Max Kontak ◽  
Volker Michel
Keyword(s):  
Inverse Problems ◽  
Matching Pursuit ◽  
A Priori ◽  
Computation Time ◽  
Point Of View ◽  
Computational Point ◽  
Linear Inverse Problems ◽  
Infinite Dimensional ◽  
Frame Condition ◽  
Ill Posed

Abstract In this work, we present the so-called Regularized Weak Functional Matching Pursuit (RWFMP) algorithm, which is a weak greedy algorithm for linear ill-posed inverse problems. In comparison to the Regularized Functional Matching Pursuit (RFMP), on which it is based, the RWFMP possesses an improved theoretical analysis including the guaranteed existence of the iterates, the convergence of the algorithm for inverse problems in infinite-dimensional Hilbert spaces, and a convergence rate, which is also valid for the particular case of the RFMP. Another improvement is the cancellation of the previously required and difficult to verify semi-frame condition. Furthermore, we provide an a-priori parameter choice rule for the RWFMP, which yields a convergent regularization. Finally, we will give a numerical example, which shows that the “weak” approach is also beneficial from the computational point of view. By applying an improved search strategy in the algorithm, which is motivated by the weak approach, we can save up to 90  of computation time in comparison to the RFMP, whereas the accuracy of the solution does not change as much.

Vom Rechten und vom Guten

1999 ◽  
Vol 43 (1) ◽  
pp. 174-186 ◽  
Author(s):  
Jan Schapp
Keyword(s):  
Moral Philosophy ◽  
General Rule ◽  
Point Of View ◽  
Rule Knowledge

Abstract With Plato, ethics answer a fundamental problern of man: the desire to own more and more. In Christianity this problern finally reaches the dimension of evil. By opposing Tiermensch (man/animal) and Vernunftmensch (man/reason), Kant's moral philosophy is no Ionger related to the solution of this problem. Kant tries to constitute moral philosophy as a science. From this point of view the author discusses central notions of Kant's moral philosophy: general rule, knowledge, faith, autonomy

scholarly journals The Oil and Gas ROFR: Understanding Current ROFR Issues from the Point of View of the Transactional Lawyer, the Litigator, and In-House Counsel

2017 ◽  
Author(s):  
Donald G. MacDiarmid ◽  
Sean J. Korney ◽  
Melanie Teetaert ◽  
Julie J.M. Taylor ◽  
Robert Martz ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Point Of View ◽  
Economic Consequences ◽  
Complex Nature ◽  
Gas Industry ◽  
Industry Standard ◽  
The Law ◽  
To Come ◽  
Corporate Lawyers

Rights of first refusal and other preferential or pre-emptive rights (together, ROFRs, and individually a ROFR) routinely find their way into oil and gas industry agreements. Disputes often arise because of the complex nature and significant economic consequences of ROFRs. In recent years, a number of reported cases, either relating directly to ROFRs or more generally relating to contractual interpretation, have clarified (or at times muddied) the waters surrounding the use, application, and interpretation of ROFRs. However, most ROFR disputes never result in a reported decision because the parties typically negotiate solutions long before trial.The authors consider current trends involving ROFRs in oil and gas agreements, and how they believe the law and legal practice surrounding ROFRs might continue to evolve in the years to come. The authors do not attempt to rehash the fundamentals of the law surrounding ROFRs; instead, they focus on how the courts have dealt with ROFRs in recent cases as well as how corporate lawyers and in-house counsel grapple with ROFRs day-today. The authors utilize the ROFR provisions found in industry standard contracts to analyze outstanding areas of uncertainty as well as what lawyers should contemplate prior to including a ROFR in an agreement. Additionally, the article examines the implications of recent rulings on the duty of good faith that may affect ROFRs. Finally, the article considers selected subjects of topical interest, including ROFRs in the context of busted butterfly transactions, insolvency proceedings, and package deals.

scholarly journals From Energy Security to the Security of Energy Services: Shortcomings of Traditional Supply-Oriented Approaches and the Contribution of a Socio-Technical and User-Oriented Perspectives

2014 ◽  
Vol 27 (1) ◽  
pp. 97-108
Author(s):  
Yael Parag
Keyword(s):  
Energy Security ◽  
Energy Systems ◽  
Point Of View ◽  
Complex Nature ◽  
Low Carbon ◽  
Discussion Paper ◽  
Energy Services ◽  
The Public ◽  
Cultural Aspects ◽  
Low Carbon Energy

Traditional literature and policy approach to energy security focus on the security of energy supply. It is argued here that a supply-centric approach to energy security is too narrow to account for the complex nature of energy systems and tends to overlook energy users, their expectations from, interaction with and roles in future low carbon energy systems. From users’ point of view, be they households, businesses or governments, the supply of kWh or oil barrels is often meaningless. What matters is not the source of energy, but rather the services provided by it. Therefore, securing energy services seems to be the public and the government’s concern, and the security of supply is only one mean to achieving it. Stemming from science, technology and society studies, this discussion paper suggests that applying a multi-level socio-technical and user-oriented perspectives which focus on the energy services and considers also psychological, social and cultural aspects of energy consumption, could reveal new and overlooked actors, roles, means and strategies that may provide and contribute to energy services security.Keywords: energy security, energy services, socio-technical systems

scholarly journals Metode dan Pendekatan dalam Studi Islam: Pembacaan atas Pemikiran Charles J. Adams

2014 ◽  
Vol 2 (1) ◽  
pp. 27
Author(s):  
Luluk Fikri Zuhriyah
Keyword(s):  
Single Point ◽  
Belief System ◽  
Sociology Of Religion ◽  
Point Of View ◽  
Complex Nature ◽  
The West ◽  
History Of ◽  
Interesting Object ◽  
Object Of Study ◽  
Oriental Studies

<p>Islam has been an interesting object of study for both Muslims and non-Muslims over a long period of time. A number of methods and approaches have also been introduced. In due time, Islam is now no longer understood solely as a doctrine or a set of belief system. Nor is it interpreted merely as an historical process. Islam is a social system comprising of a complex web of human experience. Islam does not only consist of formal codes that individuals should look at and obey. It also contains some cultural, political and economic values. Islam is a civilization. Given the complex nature of Islam it is no longer possible to deal with it from a single point of view. An inter-disciplinary perspective is required.</p><p>In the West, social and humanities sciences have long been introduced in the study of religion; studies that put a stronger emphasis on what we currently know as the history of religion, psychology of religion, sociology of religion and so on. This kind of approach in turn, is also applied in the Western studies of the Eastern religions and communities.</p><p>Islam as a religion is also dealt with in this way in the West. It is treated as part of the oriental culture to the extent that—as Muhammad Abdul Raouf has correctly argued—Islamic studies became identical to the oriental studies. By all means, the West preceded the Muslims in studying Islam from modern perspectives; perspective that puts more emphasis on social, cultural, behavioral, political and economic aspects. Among the Western scholars that approach Islam from this angle is Charles Joseph Adams whose thought this research is interested to explore.</p>

scholarly journals The Values of Virtual Civilization in the Times of Global Consumption: Homo Sapiens VS Worldwide Pandemic

2021 ◽  
Vol 129 ◽  
pp. 01022
Author(s):  
Elena Pavlova
Keyword(s):  
Interpersonal Communication ◽  
Homo Sapiens ◽  
Value Added ◽  
Integrated Approach ◽  
Temporal Analysis ◽  
Point Of View ◽  
Human Interaction ◽  
Theoretical Interpretation ◽  
Human Society ◽  
Destructive Processes

Research background: The article is devoted to the phenomenon of COVID-19 and its influence of modern man. The article analyses the processes in which the mechanisms of human interaction with the environment manifest themselves, as well as ways to address the destructive processes in the minds and behavior of modern man. Purpose of the article: In this article, from the point of view of philosophy, one of the most complex phenomena of the modern information age, is characterized, namely the modern stage of the human society in the context of pandemic is studied and analyzed. Methods: Theoretical interpretation of understanding of problem of interpersonal communication in the context of globalization and pandemic COVID-19 requires an integrated approach. The method of temporal analysis and the method of personalistic and ideal-typical reconstruction, a tool that is adequate to the author’s interpretation of social self-organization in the era of globalization as a process of constituting the temporal and ethical dominance of individuals and collectivities that formalize the integrity of the cultural epoch, will become the immediate, applied methodological basis. Findings &; Value added: Summing up our reflections, we can say that it is the flexibility, multiple variability in different behavioral situations tha is often the key to successful and efficient activity. On the contrary: constriction, resistance to the changing conditions and factors very often become an obstacle on the way to successful communication with the world around us.

scholarly journals CONVENTIONAL AND CONSENSUAL CONCEPTIONS OF SCIENTIFIC KNOWLEDGE NATURE

2020 ◽  
pp. 7-26
Author(s):  
Сергей Александрович Лебедев ◽  
Сергей Николаевич Коськов
Keyword(s):  
Scientific Knowledge ◽  
Scientific Community ◽  
A Priori ◽  
Scientific Work ◽  
Point Of View ◽  
Main Subject ◽  
Pure Experience ◽  
Classical Philosophy ◽  
The One ◽  
Methodology Of Science

В статье излагается содержание двух базовых концепций неклассической философии и методологии науки: конвенционалистской и консенсуалистской теории природы научного знания и научной истины. Каждая из них является альтернативой двум основным парадигмам классической философии и методологии науки: эмпиризму (позитивизму) и рационализму. С точки зрения конвенционализма научное знание не есть ни описание чистого опыта, ни его обобщение. Но оно не является также и результатом некой априорной интуиции и чистого разума. Согласно конвенционализму научное знание - это система доказательной информации, исходные принципы которой имеют характер условных, конвенциональных истин. Отсюда следует, что любая истина в науке не категорична, а условна и имеет форму «если, то». Консенсуалистская концепция природы научного знания возникла в философии науки второй половины XX в. Она была, с одной стороны, обобщением конвенционализма, а с другой - его отрицанием. Если в конвенционализме основным субъектом научного познания является отдельный ученый, то в консенсуалистской эпистемологии таким субъектом является социальный субъект - научное сообщество. Научное познание имеет принципиально коллективный характер как в плане его получения в силу разделения научного труда, так и в плане его легитимации и оценки. Последние операции всегда являются результатом консенсуса научного сообщества. The article examines the content of two basic conceptions of non-classical philosophy and methodology of science: the conventionalist and consensual theory of the nature of scientific knowledge. Each of them is an alternative to the two main paradigms of classical philosophy and the methodology of science: empiricism (positivism) and rationalism. From the point of view of conventionalism, scientific knowledge is neither a description of pure experience nor a generalization of it. But it is also not the result of some a priori intuition and pure reason. According to conventionalism, scientific knowledge is a system of evidence-based information, the initial principles of which have the character of conditional, conventional truths. It follows that any truth in science is not categorical, but conditional and has the form «if, then». The consensual concept of the nature of scientific knowledge emerged in the philosophy of science of the second half of the twentieth century. It was, on the one hand, a generalization of conventionalism; on the other, a negation of it. If in conventionalism the main subject of scientific knowledge is an individual scientist, then in consensual epistemology such a subject is a social subject - the scientific community. Scientific knowledge has a fundamentally collective character, both in terms of its acquisition by virtue of the division of scientific work, and in terms of its legitimization and evaluation. The latest operations are always the result of a consensus of the scientific community.

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