scholarly journals If time had no beginning: growth dynamics for past-infinite causal sets

2021 ◽  
Author(s):  
Bruno Valeixo Bento ◽  
Fay Dowker ◽  
Stav Zalel
Keyword(s):  
Physical Properties ◽  
Set Theory ◽  
Growth Dynamics ◽  
Dynamical Models ◽  
Causal Sets ◽  
Physical Constraints ◽  
The Past ◽  
New Framework

Abstract We explore whether the growth dynamics paradigm of Causal Set Theory is compatible with past-infinite causal sets. We modify the Classical Sequential Growth dynamics of Rideout and Sorkin to accommodate growth "into the past" and discuss what form physical constraints such as causality could take in this new framework. We propose convex-suborders as the "observables" or "physical properties" in a theory in which causal sets can be past-infinite and use this proposal to construct a manifestly covariant framework for dynamical models of growth for past-infinite causal sets.

Egyptology and Global History: Between Geocultural Power and the Crisis of Humanities

2021 ◽  
Vol 13 (1-2) ◽  
pp. 29-76
Author(s):  
Juan Carlos Moreno García
Keyword(s):  
Social Sciences ◽  
Global History ◽  
Historical Perspectives ◽  
The Past ◽  
Gradual Loss ◽  
Dynamic Flows ◽  
Western Hegemony ◽  
Intellectual Environment ◽  
New Strategies ◽  
New Framework

Abstract Globalization, the decline of Western hegemony, and the rise of new political and economic actors, particularly in East Asia, are concomitant with the emergence of more encompassing historical perspectives, attentive to the achievements and historical trajectories of other regions of the world. Global history provides thus a new framework to understanding our past that challenges former views based on the cultural needs, values, and expectations of the West. This means that humanities and social sciences are subject to intense scrutiny and pressed to adapt themselves to a changing cultural, academic, and intellectual environment. However, this process is hindered by the gradual loss of their former prestige and by the increasing influence of economics in the reorganization of the educational, research, and cultural agenda according to market-oriented criteria. The result is that the mobilization of the past increasingly conforms to new strategies in which connectivity, trading, and diplomatic interests, as well as integration in dynamic flows of wealth, appear of paramount importance. Egyptology is not alien to these challenges, which will in all probability reshape its very foundations in the foreseeable future.

scholarly journals The properties of early-type stars in the Magellanic Clouds

2008 ◽  
Vol 4 (S256) ◽  
pp. 325-336
Author(s):  
Christopher J. Evans
Keyword(s):  
Physical Properties ◽  
Mass Loss ◽  
Temperature Scale ◽  
Massive Stars ◽  
Magellanic Clouds ◽  
Early Type ◽  
The Past ◽  
The Galaxy ◽  
Stellar Temperature ◽  
Early Type Stars

AbstractThe past decade has witnessed impressive progress in our understanding of the physical properties of massive stars in the Magellanic Clouds, and how they compare to their cousins in the Galaxy. I summarise new results in this field, including evidence for reduced mass-loss rates and faster stellar rotational velocities in the Clouds, and their present-day compositions. I also discuss the stellar temperature scale, emphasizing its dependence on metallicity across the entire upper-part of the Hertzsprung-Russell diagram.

scholarly journals Aboriginal population of Canada: growth dynamics under conditions of encounter of civilisations

2003 ◽  
Vol 30 (1) ◽  
pp. 75 ◽  
Author(s):  
Anatole Romaniuc
Keyword(s):  
First Nations ◽  
Growth Dynamics ◽  
Historical Background ◽  
Aboriginal Peoples ◽  
Policy Issues ◽  
Aboriginal Population ◽  
The Past ◽  
The Future ◽  
Demographic Evolution

This paper endeavours to capture the broad configuration of demographic evolution of the Aboriginal peoples of Canada from the early contacts with Europeans to the present. The main stages thereof are identified and the underlying factors explored, against the historical background of Aboriginal and European civilisations' encounter. While taking stock of the past, the paper takes a glimpse into the future. It concludes with a review of demographically-driven policy issues that the First Nations are likely to confront as they step into the 21s Century.

scholarly journals Event conjunction: How the hippocampus integrates episodic memories across event boundaries

2019 ◽  
Author(s):  
Benjamin James Griffiths ◽  
Lluís Fuentemilla
Keyword(s):  
Related Event ◽  
Gamma Model ◽  
Apparent Contradiction ◽  
The Past ◽  
Continuous Stream ◽  
Event Model ◽  
Episodic Memories ◽  
Hippocampal Theta ◽  
Conceptual Link ◽  
New Framework

Our lives are a continuous stream of experience. Our episodic memories, however, have a definitive beginning, middle and end. Theories of event segmentation suggest that salient changes in our environment produce event boundaries which partition the past from the present and, as a result, produce discretised memories. However, event boundaries cannot completely discretise two memories; any shared conceptual link will eagerly integrate these memories. Here, we present a new framework inspired by electrophysiological research that resolves this apparent contradiction. At its heart, the framework proposes that hippocampal theta-gamma coupling maintains a highly abstract model of an ongoing event and serves to encode this model as an episodic memory. When a second but related event begins, this theta-gamma model is rapidly reconstructed within the hippocampus where new details of the second event can be appended to the existing event model. The event conjunction framework is the first electrophysiological explanation of how event memories can be formed at, and integrated across, event boundaries.

scholarly journals Kekasaran Permukaan Resin Komposit Nanofilled dan Nanohybrid Setelah Paparan Asap Rokok Kretek

2019 ◽  
Vol 8 (1) ◽  
pp. 30
Author(s):  
Johanna Chandra ◽  
Laksmiari Setyowati ◽  
Setyabudi Setyabudi
Keyword(s):  
Surface Roughness ◽  
Physical Properties ◽  
Cigarette Smoke ◽  
Public Health Problem ◽  
Composite Resins ◽  
Dental Composites ◽  
Distilled Water ◽  
Control Groups ◽  
The Past ◽  
Nanohybrid Composite

Background: Cigarette smoking is a public health problem that may influence physical properties of dental composites. Surface roughness is one of the physical properties of restorative materials that can influence their success. The use of nanofilled and nanohybrid composites in dentistry has substantially increased over the past few years. Purpose: The purpose of this study was to evaluate the surface roughness of nanofilled and nanohybrid composite resins exposed to kretek cigarette smoke. Methods: Twelve cylindrical specimens were prepared of each material and divided into two groups (n=6). For the control groups, the specimens were immersed in distilled water for 24 hours at 37oC and the water was renewed daily. For the experimental groups, the specimens were exposed daily to kretek cigarette smoke, then washed and stored in distilled water at 37oC. After 21 days, specimens were measured using a Surface Roughness Tester and the data was statistically analyzed. Result: Independent-T Test revealed that there were statistically significant differences in the surface roughness between control and experimental groups both nanofilled and nanohybrid, and between experimental groups nanofilled and nanohybrid. Conclusion: The exposure to kretek cigarette smoke can significantly increase the surface roughness of nanohybrid composites more than nanofilled composites.

scholarly journals Coated Metal Powders for Laser Powder Bed Fusion (L-PBF) Processing: A Review

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1831
Author(s):  
Robert Bidulsky ◽  
Federico Simone Gobber ◽  
Jana Bidulska ◽  
Marta Ceroni ◽  
Tibor Kvackaj ◽  
...  
Keyword(s):  
Physical Properties ◽  
Powder Bed Fusion ◽  
Metal Powders ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
The Past ◽  
Coated Metal ◽  
Mechanical And Physical Properties ◽  
Interesting Approach ◽  
Coating Methods

In the last years, functionalized powders are becoming of increasing interest in additive manufacturing (particularly in laser powder bed fusion processing, L-PBF), due to their improved flowability and enhanced processability, particularly in terms of laser absorbance. Functionalized powders may also provide higher final mechanical or physical properties in the manufactured parts, like an increased hardness, a higher tensile strength, and density levels close to theoretical. Coatings represent a possible interesting approach for powders’ functionalizing. Different coating methods have been studied in the past years, either mechanical or non-mechanical. This work aims to present an overview of the currently obtained coated powders, analyzing in detail the processes adopted for their production, the processability of the coated systems, and the mechanical and physical properties of the final parts obtained by using L-PBF for the powders processing.

scholarly journals Adaptive reuse process of the Historic Urban Landscape post-Covid-19. The potential of the inner areas for a “new normal”

2020 ◽  
Vol 5 (2) ◽  
pp. 87
Author(s):  
Maria Rita Pinto ◽  
Serena Viola ◽  
Katia Fabbricatti ◽  
Maria Giovanna Pacifico
Keyword(s):  
Urban Landscape ◽  
Adaptive Reuse ◽  
Health And Safety ◽  
Security Requirements ◽  
Health Security ◽  
Settlement Systems ◽  
The Past ◽  
The Face ◽  
The City ◽  
New Framework

<p class="Abstracttext-VITRUVIOCxSpFirst">Often in the past, the great disasters (environmental calamities, earthquakes, epidemics) activated unexpressed energies, triggering transformations of the built environment, able to give rise unexpected conditions of economic, cultural and social development. The fragility of settlement systems in the face of unexpected threats brings out the need for a new planning, changing our gaze on the city.</p><p class="Abstracttext-VITRUVIOCxSpMiddle">The new framework of needs drawn by the pandemic and the renewed sensitivity towards the combination of health – sustainability, rekindle the spotlight on inner areas. These emerged as "reservoirs of resilience", areas to look at, in order to reach an eco-systemic balance.</p><p class="Abstracttext-VITRUVIOCxSpMiddle">The aim of the paper is to return an experience of adaptive reuse of the Historical Urban Landscape in an inner area of Southern Italy, where the needs of health and safety of the community are integrated with the transmission of the built heritage to future generations. The goal is the promotion of inclusive prosperity scenarios, towards the so-called "new normality".</p><p class="Abstracttext-VITRUVIOCxSpLast">Starting from an in-depth literature review on the cases of pandemics in history and the strategies implemented, the research identifies health security requirements at the scale of the Historical Urban Landscape and design solutions aimed at reactivating lost synergies between communities and places.</p>

scholarly journals Permutative Renamings in the Extended Fraenkel-Mostowski Set Theory

2015 ◽  
Vol 61 (1) ◽  
pp. 79-95
Author(s):  
Andrei Alexandru ◽  
Gabriel Ciobanu
Keyword(s):  
Permutation Group ◽  
Set Theory ◽  
Combinatorial Properties ◽  
New Framework

Abstract In the new framework of the extended Fraenkel-Mostowski set theory, we define an extended interchange function as an action on a permutation group, and a new notion of permutative renaming by generalizing an existing notion of finitary permutative renaming. Some algebraic and combinatorial properties of permutative renamings expressed by using the Fraenkel-Mostowski axioms remain valid in the new framework even if we replace one axiom with a weaker axiom.

Killing God to Find Palestine ‘after the End of the World’ in Adania Shibli, Mahmoud Amer, and Maya Abu al-Hayyat

2021 ◽  
pp. 155-172
Author(s):  
Nora Parr
Keyword(s):  
Cultural Production ◽  
Symbolic Order ◽  
New Words ◽  
Existing Structures ◽  
Oslo Accords ◽  
Left Behind ◽  
The Past ◽  
The World ◽  
End Of The World ◽  
New Framework

While imagery and ideas from the past remain significant across much of Palestinian cultural production, there is an increasing push against a quagmire of language, where meaning is stuck in a past paradigm. Focusing on the work of Adania Shibli, Maya Abu al-Hayyat, and Mahmoud Amer, this chapter looks at contemporary writers who use their art to forge new words—a new language, a new framework for language—that better responds to life as they live it. In the process, existing structures of representation are forcefully discarded, though not entirely left behind. The chapter contends that the stories demand repudiation; a reckoning with the fact that somewhere between the Oslo Accords and the new millennium Palestine’s symbolic order and its lived world ceased to cohere.

Task-specific Ionic Liquids as a Green Catalysts and Solvents for Organic Synthesis

2020 ◽  
Vol 7 (1) ◽  
pp. 105-119 ◽  
Author(s):  
Swapnil A. Padvi ◽  
Dipak S. Dalal
Keyword(s):  
Ionic Liquids ◽  
Physical Properties ◽  
Organic Synthesis ◽  
Review Article ◽  
Present Review ◽  
Organic Transformations ◽  
The Past ◽  
Properties Characterization

Task-specific ionic liquids (TSILs) have received increased attention over the past few years as a Green Catalysts and Solvents for a large number of organic transformations. The present review article aims to provide an introduction, types of task-specific ionic liquids, preparation/synthesis, physical properties, characterization, use of TSILs as solvent and catalyst in organic synthesis.

Sign in / Sign up

Export Citation Format

Share Document