Instantaneous polarization attributes and directional filtering

Geophysics ◽  
1996 ◽  
Vol 61 (3) ◽  
pp. 872-881 ◽  
Author(s):  
Igor B. Morozov ◽  
Scott B. Smithson

We introduce a systematic definition of instantaneous attributes for an arbitrary multicomponent seismic signal. The definition is a natural generalization of known complex trace attributes of a one‐component signal. Instantaneous amplitude and all polarization parameters are defined as invariants of “instantaneous phase rotation.” The principal feature of our approach is the unique definition of the instantaneous phase for a signal with any number of components. Plots of subtle polarization parameters of multicomponent seismic data are easily obtained using conventional seismic plotting routines. We illustrate our approach on a synthetic example and apply it to real 3‐component, wide‐angle crustal data. Plots of polarization attributes provide evidence for shear‐wave splitting in an [Formula: see text] arrival. Having determined the instantaneous polarization vector, we design a new type of time‐domain spatial directional filter. The filter enhances linearly polarized events with specified instantaneous polarization. The filter can work with any number of components in the data, has no user‐specified parameters, and is controlled only by the signal. We conclude that rigorously defined instantaneous phase, amplitude, and polarization attributes provide new effective means for the visualization, analysis, and processing of multicomponent signal.

10.37236/2072 ◽  
2012 ◽  
Vol 19 (1) ◽  
Author(s):  
Martin Trinks

Motivated by the definition of the edge elimination polynomial of a graph we define the covered components polynomial counting spanning subgraphs with respect to their number of components, edges and covered components. We prove a recurrence relation, which shows that both graph polynomials are substitution instances of each other. We give some properties of the covered components polynomial and some results concerning relations to other graph polynomials.


2018 ◽  
Vol 7 (4.38) ◽  
pp. 818
Author(s):  
Balasundram Maniam ◽  
Jared Engel ◽  
Geetha Subramaniam

Social entrepreneurship has garnered a significant amount of attention over the last decade or two. With so much emphasis on economic and financial return, governments and commercial businesses often neglect or provide insufficient attention towards the social and natural environments. This recent surge in non-profit and social activity from social entrepreneurs is proving to be an effective means of doing business, stirring up much controversy amongst scholars along the way. This paper dives into the hotly debated definition of social entrepreneurship and examines the types of opportunities and challenges associated with new phenomenon. Then, the report concludes with a discussion on the complexity of social entrepreneurship and why future research is needed.  


2016 ◽  
Vol 4 (8) ◽  
pp. 0-0
Author(s):  
Тихон Подшивалов ◽  
Tikhon Podshivalov

The article is devoted to the definition of the conditions under which it is possible to apply the rules on evasion of law in civil relations complicated by a foreign element. It is possible to recognize evasion of law only by identification of characteristic features of this legal phenomenon in private international law. The author substantiates the idea that the dispute about the validity of imposing a ban on evasion of law in private international law doesn’t have political and legal importance: should not deny the theory of evasion of law, but to define the conditions under which it is possible to apply the norms of evasion of law. The problem is how to make the norms of evasion of law an effective means of suppression to disservice of an indefinite number of people, the protection of public policy. When imposing a ban on the evasion of law the most important is the question of the pending consequences when and where the acts of evasion of law will be revealed. The article deals with the question of identification the legal consequences of qualification of actions as done through evasion of law. Besides, the article attends to the response to “evasion of law” in the national legal systems.


2017 ◽  
Author(s):  
Luis F. Rueda Vásquez ◽  
Juan S. Vargas Mantilla ◽  
Carlos A. Niño Niño ◽  
Dorian Caraballo Ledesma ◽  
William M. Agudelo Zambrano

1996 ◽  
Vol 6 (2) ◽  
pp. 127-139 ◽  
Author(s):  
Nicoletta Sabadini ◽  
Sebastiano Vigna ◽  
Robert F. C. Walters

In this paper, we propose a new and elegant definition of the class of recursive functions, which is analogous to Kleene's definition but differs in the primitives taken, thus demonstrating the computational power of the concurrent programming language introduced in Walters (1991), Walters (1992) and Khalil and Walters (1993).The definition can be immediately rephrased for any distributive graph in a countably extensive category with products, thus allowing a wide, natural generalization of computable functions.


2008 ◽  
Vol 23 (1) ◽  
pp. 73-100 ◽  
Author(s):  
PH. MYLONAS ◽  
D. VALLET ◽  
P. CASTELLS ◽  
M. FERNÁNDEZ ◽  
Y. AVRITHIS

AbstractContext modeling has long been acknowledged as a key aspect in a wide variety of problem domains. In this paper we focus on the combination of contextualization and personalization methods to improve the performance of personalized information retrieval. The key aspects in our proposed approach are (1) the explicit distinction between historic user context and live user context, (2) the use of ontology-driven representations of the domain of discourse, as a common, enriched representational ground for content meaning, user interests, and contextual conditions, enabling the definition of effective means to relate the three of them, and (3) the introduction of fuzzy representations as an instrument to properly handle the uncertainty and imprecision involved in the automatic interpretation of meanings, user attention, and user wishes. Based on a formal grounding at the representational level, we propose methods for the automatic extraction of persistent semantic user preferences, and live, ad-hoc user interests, which are combined in order to improve the accuracy and reliability of personalization for retrieval.


2019 ◽  
Vol 29 ◽  
pp. 582
Author(s):  
Yoad Winter

A basic puzzle about presuppositions concerns their projection from propositional constructions. This problem has regained much attention in the last decade since many of its prominent accounts, including variants of the trivalent Strong Kleene connectives, suffer from the so-called *proviso problem*.This paper argues that basic insights of the Strong Kleene system can be used without invoking the proviso problem. It is shown that the notion of *determinant value* that underlies the definition of the Strong Kleene connectives leads to a natural generalization of the filtering conditions proposed in Karttunen's article ``Presuppositions of compound sentences'' (LI, 1973). Incorporating this generalized  condition into an incremental projection algorithm avoids the proviso problem as well as the derivation of conditional presuppositions. It is argued that the same effects that were previously modelled using conditional presuppositions may be viewed as effects of presupposition suspension and contextual inference on presupposition projection.


2017 ◽  
Vol 11 (4) ◽  
Author(s):  
N. Tkachenko ◽  
O. Chagarovskyi ◽  
N. Dets ◽  
E. Sevastyanova ◽  
L. Lanzhenko

In the presented article, based on the detailed analysis of scientific sources and many years of own experience in production of the probiotic foods, the definition of “probiotics” in cosmetics, as well as the definition of “living” and “probiotic” cosmetics is proposed.The skin is a complex barrier organ that has a symbiotic relationship between microbial communities and host tissue via complex signals provided by the innate and the adaptive immune systems. It is constantly exposed to various endogenous and exogenous factors – physical, chemical, bacterial and fungal, as well as the effects of the hormonal disorders, which affect this balanced system potentially leading to inflammatory skin conditions comprising infections, allergies or autoimmune diseases. In opposition to the gut and stool microbiome, which has been studied and described for many years, investigations on the skin or scalp microbiome lasts only for last 10 years. Therefore, the screening of effective means of correcting and/or maintaining the human normoflora for the preservation of healthy skin microbiome today is an urgent task.It is well known that probiotics and prebiotics are helpful for specific disorders in the human body. Skeptics wonder: can the probiotics and prebiotics be scientifically applied in cosmetics? Different clinical studies indicated that they have special effects in cutaneous apparatus directly or indirectly, which can be considered from different aspects. Probiotic bacteriotherapy can have great potential in accelerating wound healing, in preventing and treating the skin diseases including eczema, atopic dermatitis, acne, allergic inflammation or skin hypersensitivity, UV-induced skin damage and cosmetics products. Therefore, some firms are already incorporating bacteria and/or their lysates into skin creams with the promise of «rebalancing» the community of bacteria that live in the human body and delivering healthier, more radiant-looking skin. However, such parameters as the type of probiotic, the form in which it is added to the formulation (living bacteria, lysates, etc.) and the recommended concentrations of these ingredients in cosmetic products that are safe and effective are still not defined. Due to currently widespread use of probiotic cosmetic products in the world beauty industry, the concept of "probiotic" in the cosmetic industry requires a clear definition.


2021 ◽  
Author(s):  
Augusto Bianchini ◽  
Jessica Rossi

The quantification of the circular economy and sustainability is a relevant aspect at different levels of applications: (i) the companies need to evaluate and improve the environmental, economic, and social impacts of their products and processes; (ii) the financial bodies must have quantitative information about the potential and risks of different proposed initiatives to select the optimal opportunity; and (iii) the policy-makers must be guided for the coherent definition of strategies at regional, national and international scales, setting realistic targets and measuring their effectiveness. However, the lack of comprehensive and robust approaches to quantify circular economy makes it challenging to apply quantitative methods and indicators in different contexts and compare the results, with the risk of limiting the practical implementation of circular initiatives due to unknown and/or unclear potential and contribution. The ViVACE® tool (Visualization of Value to Assess Circular Economy), developed by the authors, is a promising and effective means to collect data in a systematized manner, helpful to assess sectorial and cross-sectorial indicators about sustainability. It has been applied to different industrial sectors (e.g., plastics, food processing, textile) for different purposes. These applications are described in detail to highlight the potential, versatility, and implications of the proposed tool in boosting the effective transition to a circular economy.


Author(s):  
Maryna Okladna ◽  
Kseniia Naumova ◽  
Violetta Myrhorod

Problem setting. Problems of international relations and foreign policy have always been in the center of public attention of analysts, politicians and journalists. Although secret diplomacy is a highly controversial phenomenon in terms of public morality, it is an effective means of pursuing defense policy, military cooperation and establishing international relations for peace. In practice, secret diplomacy has various forms of implementation, such as holding “closed” conferences, signing secret multilateral agreements, providing covert instructions, and others. Any form of implementation must take into account the fact that the ultimate goal is to achieve the maximum national interest with a minimum of controversy and resentment from others. Analysis of recent researches and publications. Among Ukrainian scholars, D. Kostyuk and D. Kurillo, S. Pik and others. Anthony John Wanis-ST., a professor of the American University’s School of International Service in Washington, D.C., made a significant contribution to the study of secret diplomacy. John, Cornelius Biola, a professor at Oxford University, and Aaron Klieman, a professor at Tel Aviv University. Target of research is to define the concept of secret diplomacy, analyze the main ways of its implementation, as well as explore the features of their functioning in international relations. Article’s main body. The research is devoted to the definition of “secret diplomacy” and analysis of the main ways of its implementation. Peculiarities of the functioning of forms of secret diplomacy in international relations have been studied. Forms of secret diplomacy include “closed” conferences, secret bilateral and tripartite agreements, the provision of secret instructions by states to diplomats, correspondence through closed channels, and non-public diplomacy. The definition of “secret diplomacy” is proposed. Examples of the application of secret diplomacy in practice have been studied. “Secret” conferences are a very effective way to reach agreement on some common issues, they are difficult because of both the organization and the stage: the more participants in the negotiations, the more difficult it is to maintain secrecy and control information leaks. Details of such negotiations are often leaked to the media, causing serious harm to participants. The signing of secret bilateral and tripartite agreements allows countries to significantly expand the range of issues under discussion, including all issues, from cooperation in various sectors of the economy, military cooperation to joint action in the international arena. The practice of giving secret instructions to diplomats is often used: when sending a diplomatic mission, the state provides its members with a number of mandatory secret instructions, as well as coordinates its work during negotiations. Closed channel correspondence, the biggest advantage of which is the small number of people who take part in it, which in turn allows the sender and recipient to keep all correspondence secret, preventing the essence of correspondence from being revealed to third parties. Non-public diplomacy consists of negotiations officially authorized by the leadership of states, which take place between the parties to the conflict in secret from other parties. Conclusions and prospects for the development. Despite the disadvantages, covert diplomacy can create an enabling environment for constructive negotiations by isolating foreign policy figures from public speaking, giving them the highest level of security, informality, autonomy and the ability to “save face” in public. It is not a universal way to solve all problems, but, in our opinion, it is an effective method of resolving protracted conflicts that negatively affect world politics.


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