Uranium Catalysts for the Synthesis of Highly Cis-Tactic Polydienes

1974 ◽  
Vol 47 (5) ◽  
pp. 1175-1192 ◽  
Author(s):  
M. Bruzzone ◽  
A. Mazzei ◽  
G. Giuliani

Abstract Among the several transition metals used for the synthesis of polymers by Ziegler-Natta catalysts very little attention has been devoted to uranium, notwithstanding the undoubted interest that this metal offers from both the scientific and economical point of view. In fact, uranium gives the organo-metallic and the polymer chemist wide possibilities of synthesis, owing to its manifold coordination possibilities. From the economical point of view, uranium is already a cheap material, as a byproduct of nuclear fuel cycles, and one can easily foresee that, as happened in the past for coal and crude oil, uranium will have a future as a raw material in addition to its use as an energy source. The large potential supply of depleted uranium from the existing gaseous diffusion plants in the world and a forecast of this supply in western Europe from 1975 to 1985 is reported in Table I. This forecast is likely to be underestimated as it was made before the present worldwide energy crisis.

2013 ◽  
Vol 22 (3-4) ◽  
pp. 255-277 ◽  
Author(s):  
Vladimír Bačík ◽  
Michal Klobučník

Abstract The Tour de France, a three week bicycle race has a unique place in the world of sports. The 100th edition of the event took place in 2013. In the past of 110 years of its history, people noticed unique stories and duels in particular periods, celebrities that became legends that the world of sports will never forget. Also many places where the races unfolded made history in the Tour de France. In this article we tried to point out the spatial context of this event using advanced technologies for distribution of historical facts over the Internet. The Introduction briefly displays the attendance of a particular stage based on a regional point of view. The main topic deals with selected historical aspects of difficult ascents which every year decide the winner of Tour de France, and also attract fans from all over the world. In the final stage of the research, the distribution of results on the website available to a wide circle of fans of this sports event played a very significant part (www.tdfrance.eu). Using advanced methods and procedures we have tried to capture the historical and spatial dimensions of Tour de France in its general form and thus offering a new view of this unique sports event not only to the expert community, but for the general public as well.


Although in an ideal form the information in the world would not involve people, in reality, it has no meaning without people observing and interacting with it. There is a widespread myth (a positivistic view) that information is something in the world that does not depend on people’s point of view and that it is independent of the situation in which it occurs. But information never has fixed significance. The available data is simply the raw material that must be processed. Any particular information element gains significance only from its relationship to other information in the context in which it occurs (Woods, Patterson, & Roth, 2002). However, this chapter tries to minimize those interaction and interpretation aspects, deferring those for the later parts of the book. Instead, it concentrates on the issues of the information in the situation before it gets mentally processed.


2015 ◽  
Vol 1 (2) ◽  
pp. 190-219 ◽  
Author(s):  
Felix Sze ◽  
Silva Isma ◽  
Adhika Irlang Suwiryo ◽  
Laura Lesmana Wijaya ◽  
Adhi Kusumo Bharato ◽  
...  

The distinction between languages and dialects has remained a controversial issue in literature. When such a distinction is made, it often has far-reaching implications in top-down language promotion and preservation policies that tend to favor only those varieties that are labelled as ‘languages’. This issue is of critical importance for the survival of most sign language varieties in the world from a socio-political point of view. Against this background, this paper discusses how the notions of ‘dialect’ and ‘language’ have been applied in classifying sign languages in the past few decades. In particular, the paper reports on two recent studies which provide linguistic evidence that the signing varieties used by Deaf signers in Jakarta and Yogyakarta in Indonesia should be regarded as distinct sign languages rather than mutually intelligible dialects of Indonesian Sign Language. The evidence comes from significant differences in the lexicon, preferred word order for encoding transitive events, and use of mouth actions. Our result suggests that signing varieties within a country can be significantly different from each other, thus calling for more concerted efforts in documenting and recognizing these differences if the linguistic needs of the signing communities are to be met.


Author(s):  
Giovanni Stanghellini

This chapter discusses how perspectivism is the device through which each one of us, who first and foremost sees the world from his point of view, is able to recognize that precisely as just one point of view, and thereby to change it. A healthy mental condition implies the ability to change one’s point of view and temporarily take the perspective of another person. The stronger the reciprocity of perspectives between my former and my present ego, and between my own vantage and the Other’s, the weaker the tendency to perceive my motivations as absolutely necessary. Perspectivism allows me to see myself as not strictly determined by the past and by the involuntary, and may restore a sense of agency. This explains why the reciprocity of perspectives is a therapeutic goal and perspectivism—the attempt to see things from the point of view of the Other—is a therapeutic device.


Author(s):  
Laurence Brockliss

Childhood in western Europe is obviously a vast topic, and this entry will approach it historically and largely chronologically. The study of childhood is still relatively new, and historians have sometimes struggled to construct a history of childhood, with very few firsthand accounts and limited archives. So many children left very few traces of their lives, and historians have had to piece together their history, not from diaries or archives but from court reports, visual representations, and childcare manuals. They have had to struggle to recapture the world of childhood in eras prior to 1800, when sources are especially limited. They, like others interested in childhood studies, have had to address the issue of how to define a child and what childhood is. They have had to contemplate the different historical meanings of the word child prior to 1600 and to resist the temptation to believe that childhood has inevitably improved through the centuries. They have also had to become aware of the dangers of historicizing a phenomenon that has few stable parameters and, in some cultures, may not even exist at all. In several languages there is no word for child; even in English, the word has drastically shifted its meaning over the centuries. These shifts need to be historicized in order to see both the continuities and the discontinuities between the past and the present that suggest that childhood has always been a time of suffering; children have always been the victims of perilous disease, parental neglect, government policy, war, etc. Concurrently, children have also always been the hope of the future, the focus of special love and attention. A historical perspective on European childhoods brings this insight into sharp focus.


2019 ◽  
Vol 33 (3) ◽  
pp. 412-428
Author(s):  
Sofia Mutlu-Numansen ◽  
Marinus Ossewaarde

Abstract This article analyzes how Aramean, Assyrian, and Chaldean communities in Western Europe organize their struggle for Sayfo (genocide) recognition and how narratives of the past are enacted in their campaign. The year 2015 provided a unique opportunity to study such diasporic communities’ strategic uses of the past. Hundreds of centenary commemorations were organized all over the world. The authors have selected three that illustrate how the Sayfo recognition campaign was organized, and how its practitioners strategically use the past in their efforts.


Author(s):  
Deepak Nayyar

This chapter analyses the striking changes in the geographical distribution of manufacturing production amongst countries and across continents since 1750, a period that spans more than two-and-a-half centuries, which could be described as the movement of industrial hubs in the world economy over time. Until around 1820, world manufacturing production was concentrated in China and India. The Industrial Revolution, followed by the advent of colonialism, led to deindustrialization in Asia and, by 1880, Britain became the world industrial hub that extended to northwestern Europe. The United States surpassed Britain in 1900, and was the dominant industrial hub in the world until 2000. During 1950 to 2000, the relative, though not absolute, importance of Western Europe diminished, and Japan emerged as a significant industrial hub, while the other new industrial hub, the USSR and Eastern Europe, was short lived. The early twenty-first century, 2000–2017, witnessed a rapid decline of the United States, Western Europe, and Japan as industrial hubs, to be replaced largely by Asia, particularly China. This process of shifting hubs, associated with industrialization in some countries and deindustrialization in other countries in the past, might be associated with premature deindustrialization in yet other countries in the future.


2018 ◽  
Vol 272 ◽  
pp. 273-279 ◽  
Author(s):  
Břetislav Teplý ◽  
Tomáš Vymazal ◽  
Pavla Rovnaníková

Efficient sustainability management requires the use of tools that enable the quantification, measurement or comparison of material, technological and construction variants. Tools of this kind which have been developed around the world in recent years include various indicators, indexes, etc. Generally, technical, economic, ecological and socio-cultural areas must all be included. Such a tool can be used as a powerful marketing aid and as support for the transition to the “circular economy”. Life Cycle Assessment (LCA) procedures are also used, alongside other approaches. LCA is a method that evaluates the life cycle of a structure from the point of view of its effect on the environment. Processes starting with the mining of mineral resources and including their transport, production and use up to their final processing as waste (recycling) are all taken into account. In addition, consideration is given to energy and raw material costs, and to environmental impact throughout the whole life cycle – e.g. through emissions. The presented contribution focuses on the quantification of sustainability connected with the use of various types of concrete with regard to their resistance against the effect of degrading influences. Sustainability factors are also determined using information regarding service life and “eco-costs”. The aim is to present a suitable methodology which can simplify decision-making concerning the design and choice of concrete mixes from a wider perspective, i.e. not only from the aspects of load-bearing capacity or durability.


SIASAT ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 45-52
Author(s):  
Mohammad Taghi Sheykhi ◽  
Muhammad Ridwan

The present article intends to reflect the appearance of different pandemics in different periods from sociological point of view. Earlier pandemics used to appear without being able to control them; at the historical times without medications, hospitals, motor vehicles, without communications etc. Millions of people died because of spreading unknown diseases such as flu, cholera, black death, plague and the like. Estimates show that the first 15 events killed over 85 million people. Plague in Italy during some years in the 17th century perished many people vs the least of facilities within reach. Similarly, great plague in Spain in mid 17th century took the lives of a large number of people. Great plague of London also in the second half of the 17th century killed more than 100,000 of citizens. Such events not only directly killed older household members, but created bad lives and deprivation for the younger remaining members in such households. Many of such children had to resort to orphanages. Cholera outbreak also appeared in early 19th century in India, Russia and Africa leaving behind a great number of deaths. The flu pandemic at the end of 19th century killed many people. Many countries came to know more on influenza since then. The outbreak of Coronavirus in 2020 is the worst very widespread and global affecting and infecting many people in all corners of the world. Coronavirus pandemic is wide spreading without being prevented. Despite all the existing facilities, it is killing more than the earlier pandemics in terms of time and space. As education and understanding of people are currently higher than before, they highly feel distressed and disordered.    


2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Ana María Aguilar López ◽  
Marta Miguel Borge

Our model of the world that we perceive within ourselves, our conscience, in short, our psychological balance is influenced by our surroundings. Part of the input to which we are exposed in this immediate environment is related to texts, self-managed discourse, which can also influence our internal model of the world; hence they are deserving of our attention. In the same way as the models of the world that we construct throughout our lives, reality is not static and also changes as time goes by. From a social point of view, we can see that the roles of women in modern-day society and the ways that those roles can be perceived today are a consequence of changes initiated in the past within different areas and in a prolonged process over time up until our day. With the aim of evaluating whether female drama has contributed to that change, we present an analysis in this paper of the play La Cinta Dorada [The Golden Ribbon] by María Manuela Reina, written and set in the 1980s, a decade that for Spain implied a more obvious abandonment of the most traditional conceptions of the role of women. In the analysis of the play, we see how the models of the world of the older people are counterposed with those of the younger people, a generational divide that is enriched with the gender difference, as we also analyze how the psychological structures of the female and male characters confront the clichés pertaining to another era in reference to such topics as success, infidelity, matrimony, and gender. The results of our analysis demonstrate how Reina responds to archaic conceptions, thereby inciting the audiences of the day to question their respective models of the world, especially, with regard to the role of the woman in society. 


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