scholarly journals Влияние никеля на время жизни носителей заряда в кремниевых солнечных элементах

Author(s):  
М.К. Бахадырханов ◽  
З.Т. Кенжаев ◽  
С.В. Ковешников ◽  
К.С. Аюпов ◽  
Е.Ж. Косбергенов

It has been shown experimentally that nickel clusters on the surface of a silicon sample contain a large amount of oxygen and recombination impurities - Cu, Fe, Cr, which shows good gettering properties of clusters. The optimum temperature of nickel diffusion into silicon is determined - Т=800-850 ° С. Doping with impurity nickel atoms with the formation of clusters makes it possible to increase the lifetime of nonequilibrium charge carriers in the base of a solar cell by up to 2 times, while the formation of a nickel-enriched region in the face layer is more efficient. It is shown that the effect of additional doping with nickel weakly depends on the sequence of the processes of nickel diffusion and the creation of a working p–n-junction.

2020 ◽  
Vol 9 (2) ◽  
pp. 330-347
Author(s):  
Hugo Agra

O artigo analisa um tema pouco abordado na literatura brasileira de relações internacionais: a atuação das políticas externas do Brasil e do México para a criação do Grupo de Contadora (1983), Grupo de Apoio à Contadora (1985) e do Grupo do Rio (1987). Esses grupos tiveram papéis importantes nas tentativas de estabilização dos problemas políticos, econômicos e sociais da América Central a partir dos anos 1980. O artigo está dividido em quatro partes: i) compreensão da criação do Grupo de Contadora, do Grupo de Apoio à Contadora e a atuação do Brasil e do México, ii) destaque aos principais objetivos desses dois grupos, iii) explica o “dilema” das políticas externas do Brasil e do México diante das ações estadunidenses para a América Central e iv) e descreve a criação e os objetivos do Grupo do Rio. Por meio de uma pesquisa explicativa, onde é fundamental reunir informações sobre vários assuntos para entender de forma mais abrangente um tema específico, o artigo faz uso de fontes secundárias que analisam as relações internacionais da América Latina e os processos decisórios das políticas externas do Brasil e do México na década de 1980, além de algumas fontes primárias, como documentos oficiais dos acordos celebrados e declarações presidenciais disponíveis em arquivos dos sites eletrônicos da presidência ou chancelaria dos países. Conclui-se mostrando que os dois países foram fundamentais para o processo de estabilização política, principalmente na região centro-americana, não só pela importância histórica, política e econômica de cada um, mas também pelo fato de que a formação desses grupos foram importantes para dirimir litígios, acelerar a resolução de conflitos entre os países do continente, além de ter sido um período de aproximação e fortalecimento da relação bilateral Brasil-México.         ABSTRACT: The article analyzes a theme little addressed in the Brazilian literature of international relations: the performance of the foreign policies of Brazil and Mexico for the creation of the Contadora Group (1983), the Contadora Support Group (1985) and the Rio Group (1987). These groups played important roles in attempts to stabilize the political, economic and social problems of Central America from the 1980s onwards. The article is divided into four parts: i) an understanding of the creation of the Contadora Group, the Contadora Support Group and the actions of Brazil and Mexico, ii) highlighting the main objectives of these two groups, iii) explaining the "dilemma" of the foreign policies of Brazil and Mexico in the face of US actions for Central America, and iv) describing the creation and objectives of the Rio Group. By means of an explanatory survey, where it is essential to gather information on various subjects in order to understand more comprehensively a specific theme, the article makes use of secondary sources that analyze the international relations of Latin America and the decision-making processes of the foreign policies of Brazil and Mexico in the 1980s, in addition to some primary sources, such as official documents of the agreements signed and presidential declarations available on the archives of the electronic sites of the presidency or chancellery of the countries. It concludes by showing that both countries were fundamental to the process of political stabilization, especially in the Central American region, not only because of their historical, political and economic importance, but also because the formation of these groups was important to settle disputes, accelerate the resolution of conflicts between the countries of the continent, and was a period of rapprochement and strengthening of the bilateral relationship between Brazil and Mexico. Keywords: International Relations; Latin America; Contadora Group; Rio Group.       Aprovado em: setembro/2019. Recebido em: agosto/2020.


2021 ◽  
pp. 1-26
Author(s):  
Ruth Schmidt ◽  
Katelyn Stenger

Abstract Despite widespread recognition that behavioral public policy (BPP) needs to move beyond nudging if the field is to achieve more significant impact, problem-solving approaches remain optimized to achieve tactical success and are evaluated by short-term metrics with the assumption of stable systems. As a result, current methodologies may contribute to the development of solutions that appear well formed but become ‘brittle’ in the face of more complex contexts if they fail to consider important contextual cues, broader system forces, and emergent conditions, which can take three distinct forms: contextual, systemic, and anticipatory brittleness. The Covid-19 pandemic and vaccination rollout present an opportunity to identify and correct interventional brittleness with a new methodological approach – strategic BPP (SBPP) – that can inform the creation of more resilient solutions by embracing more diverse forms of evidence and applied foresight, designing interventions within ecosystems, and iteratively developing solutions. To advance the case for adopting a SBPP and ‘roughly right’ modes of inquiry, we use the Covid-19 vaccination rollout to define a new methodological roadmap, while also acknowledging that taking a more strategic approach may challenge current BPP norms.


Elements ◽  
2015 ◽  
Vol 11 (1) ◽  
Author(s):  
Danielle Nista

For a slave living under the system of chattel slavery in the American South during the nineteenth century, avenues of self-expression were extremely limited. One of the few ways slaves could exert control over their own lives was through singing and dancing. These arts gave slaves a chance to relieve stress and establish a culture through the creation of musical instruments, songs, and dances. All of these contained hints at the true nature of slaves’ feelings towards the system that oppressed them, feelings that they had to frequently repress. However, despite slaves’ efforts to make this culture entirely their own, masters tried to find ways to use it to their advantage instead of to the slaves’ benefit. The resulting covert power struggle sometimes ended in favor of the masters, taking the form of regulations on slaves’ dances, requirement of the performance of songs and dances for the masters’ entertainment, and even abuse of slaves by using their own arts. Ultimately, however, slaves emerged victorious because of the hidden messages in their songs and dances. Though this method of coping could not erase all the masters did, it was at least one glimmer of hope.


2016 ◽  
Vol 6 (2) ◽  
pp. 23-25
Author(s):  
Ruth Illman

A response to Melissa Raphael’s article ‘The creation of beauty by its destruction: the idoloclastic aesthetic in modern and contemporary Jewish art’. Key themes discussed include the notion of human beings as created in the image of God, Levinas’s understanding of the face and its ethical demand as well as the contemporary issue of the commodification of the human face in digital media.


2014 ◽  
Vol 22 (1) ◽  
pp. 34-50
Author(s):  
Hilary Marlow

Drawing on insights from the field of ‘ecocriticism’ within literary studies, this article examines the creation poem of Ben Sira (16.26-17.14) from an ecological perspective. The text is significant for such a purpose because of its reuse of the Genesis creation accounts, in particular the notion of human beings as the image of God and with dominion over creation, which has caused some critics to label the biblical accounts as exploitatively anthropocentric. Preceding sections of Sirach include discussion of human significance ‘in a boundless creation’ and human free will and moral responsibility, and these themes are developed in the poem itself. The poem’s description of the creation of humankind suggests both human finitude, a characteristic shared with other life forms, and the uniqueness of the divine image in human beings. These characteristics are set within the context of the cosmos as a stable and ordered whole, obedient to God, and of the responsibilities stipulated in the Torah to deal rightly with one’s neighbour. Reading this text from an ecological perspective invites recognition of the ambiguity of human place in the world, transient yet earth-changing, and of the ethical challenges in caring for global neighbours in the face of growing environmental pressures.



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