2,780 research outputs found
Data and platform co-ops in smart city citizenship: interview with Igor Calzada
No full textIgor Calzada is a senior researcher at universities like Oxford and Cardiff with a focus on urban, regional and technopolitical transformations, considering data issues and social innovation. In November 2020, he launched the book Smart City Citizenship, which proposes another framework at smart cities based on democratic governance and citizenship. Thus, he presents how it is possible to understand and intervene in technopolitical disputes involving algorithms, data, and artificial intelligence based on notions such as digital sovereignty. Among the possibilities, there is the creation of data and platform co-ops based on data and digital commons. For the author, data cooperatives are a subtype of platform cooperatives, in which they focus on business models, while data co-ops share and store data. The book analyzes, among other cases, the Barcelona ecosystem and proposes perspectives for public policies. Currently, Calzada is interested in exploring new models of data governance and artificial intelligence to propose alternative ways to data ecosystems in the European scenario. He defends experimental cities as a reaction to the mainstream idea of the city as a platform, as a reproduction of extractive and panoptic practices through hyperconnectivity. But it will be very difficult in a dangerous context. And he provokes: “how, in the current context, in which we are closed in our homes, can we propose cities with open systems? Other recommendations from the author are an article on platform and data co-ops published in Sustainability journal and a conversation in Spanish about social innovation in smart cities. Read the interview with Igor Calzada: https://digilabour.com.br/2021/01/06/data-and-platform-co-ops-in-smart-city-citizenship-interview-with-igor-calzada
Piano works by Igor Stravinsky
No full textIn my work I thought was right at first a brief outline development work of Igor Stravinsky. I also tried to "map out" the emergence of some major piano works by the author. finally, I added a few notes on the piano interpretive art of Igor Stravinsky
Introduzione a Igor Spanò (a cura di) Il Teatro e la festa. Il tempio, la piazza, la scena
No full textPer tre giorni gli studiosi che sono intervenuti al Convegno hanno riflettuto sul senso e sulle funzioni, sulle pratiche cultuali e rituali, sui luoghi che hanno definito nel corso del tempo i momenti della festa e sulle forme di rappresentazione agonistica (danze, corse, gare, giochi di abilità) o drammatica - di cui erano parte essenziale la musica e il canto - che, spesso intrinsecamente, li accompagnano. L'autore nella sua introduzione esamina le sfumature di significato che racchiude il termine utsava, “festa”, “gioia” in sanscrito.For three days the scholars who spoke at the conference reflected on the meaning and functions, on the cult and ritual practices, on the places that have defined the moments of the celebration over time and on the forms of competitive representation (dances, races, competitions, skill games) or dramatic - of which music and singing were an essential part - which, often intrinsically, accompany them. In his introduction, the author examines the nuances of meaning contained in the term utsava, "feast", "joy" in Sanskrit
Piezoeletricidade e ferroeletricidade em aminoácido glicina
No full textDoutoramento em Nanociências e NanotecnologiaBioorganic ferroelectrics and piezoelectrics are becoming increasingly important in view of their intrinsic compatibility with biological environment and biofunctionality combined with strong piezoelectric effect and switchable polarization at room temperature. Here we study piezoelectricity and ferroelectricity in the smallest amino acid glycine, representing a broad class of non-centrosymmetric amino acids.
Glycine is one of the basic and important elements in biology, as it serves as a building block for proteins. Three polymorphic forms with different physical properties are possible in glycine (α, β and γ), Of special interest for various applications are non-centrosymmetric polymorphs: β-glycine and γ-glycine. The most useful β-polymorph being ferroelectric took much less attention than the other due to its instability under ambient conditions. In this work, we could grow stable microcrystals of β-glycine by the evaporation of aqueous solution on a (111)Pt/Ti/SiO2/Si substrate as a template. The effects of the solution concentration and Pt-assisted nucleation on the crystal growth and phase evolution were characterized by X-ray diffraction analysis and Raman spectroscopy.
In addition, spin-coating technique was used for the fabrication of highly aligned nano-islands of β-glycine with regular orientation of the crystallographic axes relative the underlying substrate (Pt).
Further we study both as-grown and tip-induced domain structures and polarization switching in the β-glycine molecular systems by Piezoresponse Force Microscopy (PFM) and compare the results with molecular modeling and computer simulations. We show that β-glycine is indeed a room-temperature ferroelectric and polarization can be switched by applying a bias to non-polar cuts via a conducting tip of atomic force microscope (AFM). Dynamics of these in-plane domains is studied as a function of applied voltage and pulse duration. The domain shape is dictated by both internal and external polarization screening mediated by defects and topographic features. Thermodynamic theory is applied to explain the domain propagation induced by the AFM tip. Our findings suggest that β-glycine is a uniaxial ferroelectric with the properties controlled by the charged domain walls which in turn can be manipulated by external bias.
Besides, nonlinear optical properties of β-glycine were investigated by a second harmonic generation (SHG) method. SHG method confirmed that the 2-fold symmetry is preserved in as-grown crystals, thus reflecting the expected P21 symmetry of the β-phase. Spontaneous polarization direction is found to be parallel to the monoclinic [010] axis and directed along the crystal length. These data are confirmed by computational molecular modeling. Optical measurements revealed also relatively high values of the nonlinear optical susceptibility (50% greater than in the z-cut quartz).
The potential of using stable β-glycine crystals in various applications are discussed in this work.Piezo e ferroeléctricos biorgânicos são materiais que estão a atrair para si uma importância crescente por força da sua compatibilidade intrínseca com ambientes biológicos e uma biofuncionalidade aliada a um forte efeito piezoeléctrico e polarização controlada, a temperature ambiente. Aqui estudamos a piezo e ferroelectricidade no mais pequeno aminoácido, a glicina, representando uma ampla classe de aminoácidos nao-centrosimétricos.
A glicina é um elemento básico e extremamente importante em biologia, uma vez que serve de unidade base de construção para proteínas. Três formas polifórmicas com diferentes propriedades são possíveis na glicina (α, β e γ). De especial interesse para várias aplicações são as estruturas não-centrosimétricas: β-glycina e γ-glycina. A mais interessante β-polimorfa está a ser alvo de uma atenção reduzida, comparativamente às outras, por motivos de uma maior instabilidade a temperatura ambiente. Neste trabalho, Podemos crescer microcristais estáveis de glicina-β pela evaporação da solução aquosa num substrato (111)Pt/Ti/SiO2/Si que funciona como "template". Os efeitos da concentração da solução e da nucleação Pt-assistida no crescimento do cristal e evolução da fase foram estudados com recurso à difracção Raio-X e espectroscopia Raman.
Adicionalmente, a técnica de "spin-coating" foi utilizada para a fabricação de nano-ilhas de glicina-β altamente alinhadas, com a orientação dos eixos cristalográficos normalizada pelo substrato de Pt.
Estudamos a indução de domínios estruturais por meio da ponta do AFM e a variação da polarização nos sistemas moleculares da β-glicina através da técnica PFM (Microscopia de Piezo Força), comparando os resultados obtidos com modelação molecular e simulações computacionais. Mostramos que a β-glycina é de facto um piezoeléctrico à temperatura ambiente e a polarização pode ser controlada por aplicação de uma tensão a cortes não polares. A dinâmica destes domínios complanares é estudada como função da tensão aplicada e duração do pulso. A forma do domínio é ditada pela polarização interna e externa, cujo rastreio é mediado por defeitos e características topográficas. A teoria termodinâmica é aplicada para explicar a propagação dos domínios induzidos pela ponta do AFM. As nossas descobertas sugerem que a β-glycina é um ferroeléctrico uniaxial com propriedades controladas pelas fronteiras dos domínios (electronicamente carregadas), que em seu turno podem ser manipuladas por tensão externa.
Adicionalmente, propriedades ópticas não-lineares da β-glycina foram investigadas por um método de segunda geração harmonica (SHG). Este método confirmou que a simetria axial é preservada em cristais crescidos sem pós-tratamento, reflectindo a esperada simetria P21 da fase β. A direcção da polarização espontânea mostrou ser paralela ao eixo monoclínico [010] e direccionada no comprimento do cristal. Estes dados foram confirmados por modelação computacional molecular. Medições ópticas revelaram também um valor relativamente elevado para a susceptabilidade óptica não-linear (50% maior que no quartzo com corte em z).
O pontencial uso de cristais de β-glycina estáveis em diversas aplicações são também discutidos
DigiTranScope: the governance of digitally-transformed society
No full textThis volume presents the key outcomes and research findings of the Digitranscope research project of the European Commission Joint Research Centre. The project set out to explore during the period 2017-2020 the challenges and opportunities that the digital transformation is posing to the governance of society. We focused our attention on the governance of data as a key aspect to understand and shape the governance of society. Data is a key resource in the digital economy, and control over the way it is generated, collected, aggregated, and value is extracted and distributed in society is crucial. We have explored the increasing awareness about the strategic importance of data and emerging governance models to distribute the value generated more equitably in society. These findings have contributed to the new policy orientation in Europe on technological and data sovereignty and the sharing of data for the public interest. The digital transformation, the rise of artificial intelligence and the Internet of Things offer also new opportunities for new forms of policy design, implementation, and assessment providing more personalised support to those who need it and being more participative throughout the policy cycle. The use of digital twins, gaming, simulation, and synthetic data are just at their beginning but promise to change radically the relationships among all the stakeholders in governance of our society
Tõrked Eesti venekeelse kirjanduse omaks tunnistamisel 1918–1940. Igor Severjanini juhtum
No full textThe article looks at the history of Estonian Russian-language literature in the young Republic of Estonia (1918–1940) and the life and work of the Russian-speaking poet Igor Severyanin (1887–1941) from the perspective of Estonian literature. In 1918, Severyanin, as a mature author, moved permanently from Russia to Estonia. Gradually, he developed a hybrid identity: he became fond of Estonia and wrote in Russian. However, his works have been omitted from the Estonian literary history.
The article sets out the following hypotheses:
1) Estonian Russian-language literature from 1918 to 1940 has not become part of Estonian literature of that period, as its acceptance is hindered by various cultural-historical barriers for literary researchers. The main barriers have been highlighted by means of source criticism.
2) Igor Severyanin’s life and work serve to situate him as a representative of Estonian literature. Terms such as integration and identity were not used in his day, but Severyanin’s personal and creative choices help to understand, retrospectively, that it was important for him to live in Estonia, write poetry inspired by local material, interact with Estonian-speaking colleagues, remain connected with Estonian public and cultural institutions. I have approached Severyanin’s case through the identity theory (the work of John Charles Turner and Homi Bhabha), as well as Pierre Bourdieu’s concept of the literary field.
Both hypotheses were confirmed in the article. However, the values of modern multicultural society dictate that the discussion of Estonian literary history should include the Russian-speaking authors of the interwar period. Currently, there are gaps in Estonian literary history regarding these authors. Filling these gaps would mean overcoming the cultural-historical barriers
Compositions of Igor Stravinsky for Violin
No full textThe topic of my thesis is life and work of Igor Stravinsky with norrow focus on compositions for violin. I give greater emphasis to compositions Concerto in D for Violin and Orchestra and the Italian suite with which I have personal experience. Igor Stravinsky composed most of the compositions in the 1930th in cooperation with the violinist Samuel Duskin. Only a few of them are completely original works. The author often used musical themes from his own previously composed ballets, such as the The Firebird, Petrushka, The Soldier's Tale, Pulcinella, or Fairy's Kiss.
Composer Igor Stravinsky is certainly a controversial figure. Though essentially a pragmatist, he was always directed more by instinct while creating music. I would like to present to not only violinists interesting circumstances of compositions, even though is still little available informations
Piezoelectricity and Ferroelectricity in Biomaterials: From Proteins to Self-assembled Peptide Nanotubes
No full textPOLITICAL GEOGRAPHY from Igor Okunev
No full textWho has the exact sovereignty to every particular piece of territory, water or air space on our planet? What is the status and the relationship between the states, political entities, dependent territories, international organizations and supranational unions? What is the true meaning of the term’s territorial identity, spatial identity and the political geography? It is with these questions that Igor Okunev opens his passionate plea of why we should care about the geo-politics or Political Geography as he names it. Contrary to popular belief, the author argues, "the spatiality of politics is determined by factors beyond objective ones.
Erratum: Role of negative pressure therapy as damage control in soft tissue reconstruction for open tibial fractures (Journal of Reconstructive Microsurgery 33:S1 DOI: 10.1055/s-0037-1606542)
No full textIt has been brought to the Publisher's attention that the author name "Igor Pellegatta" was not listed correctly in the above-mentioned article, published in J Reconstruct Microsurg vol. 33, issue S1. DOI of the original article is 10.1055/s-0037-1606542. The names should be listed with "Igor" as first name and "Pellegatta" as family name
- …
