25,246 research outputs found
The Stanford Archival Repository Project:preserving our digital past
No full textThe Stanford Archival Repository Project aims to build a robust archiving system that can protect digital objects from failures over very long time spans. Objects are replicated among cooperating digital archives, so that if any archive fails its objects survive. We have designed an architecture for digital archives, and developed techniques for efficiently replicating objects to remote sites. We have also built simulation software that allows an archivist to design the most effective archiving system possible despite limited resources
Revisión entre pares como instrumento de aprendizaje
No full textProyecto de Innovación Docente en las asignaturas de Organización de Contenidos Audiovisuales y e Inteligencia en Redes de ComunicacionesEste artículo describe la experiencia de innovación docente llevada a cabo este último curso basada en la aplicación de la metodología de revisión entre iguales como instrumento para el aprendizaje, desarrollada en las asignaturas Organización de Contenidos Audiovisuales (Ingeniería Técnica de Telecomunicación, especialidad Sonido e Imagen) durante el curso 2003-04 e Inteligencia en Redes de Comunicaciones (Ingeniería de Telecomunicación) durante el curso 2004-05. Los experimentos realizados muestran la utilidad de la metodología de revisión entre pares como instrumento para el aprendizaje, percibido de forma subjetiva por los alumnos participantes y demostrado empíricamente en un experimento de control mediante preguntas test, descrito en este documento.
Lyman break galaxies and the star formation rate of the Universe at z ~ 6
No full textWe determine the space density of UV-luminous starburst galaxies at z≈ 6 using deep HST ACS SDSS-i′ (F775W) and SDSS-z′ (F850LP) and VLT ISAAC J and Ks band imaging of the Chandra Deep Field South. We find eight galaxies and one star with (i′−z′) > 1.5 to a depth of z′AB= 25.6 (an 8σ detection in each of the 3 available ACS epochs). This corresponds to an unobscured star formation rate of ≈15 h−270 M⊙ yr−1 at z= 5.9, equivalent to L* for the Lyman-break population at z= 3–4 (ΩΛ= 0.7, ΩM= 0.3). We are sensitive to star-forming galaxies at 5.6 ≲z≲ 7.0 with an effective comoving volume of ≈1.8 × 105h−370 Mpc3 after accounting for incompleteness at the higher redshifts due to luminosity bias. This volume should encompass the primeval subgalactic-scale fragments of the progenitors of about a thousand L* galaxies at the current epoch. We determine a volume-averaged global star formation rate of (6.7 ± 2.7) × 10−4h70 M⊙ yr−1 Mpc−3 at z∼ 6 from rest-frame UV selected starbursts at the bright end of the luminosity function: this is a lower limit because of dust obscuration and galaxies below our sensitivity limit. This measurement shows that at z∼ 6 the star formation density at the bright end is a factor of ∼6 times less than that determined by Steidel et al. for a comparable sample of UV-selected galaxies at z= 3–4, and so extends our knowledge of the star formation history of the Universe to earlier times than previous work and into the epoch where reionization may have occurred
The Benefits of Being Economics Professor A (and not Z)
No full textAlphabetic name ordering on multi-authored academic papers, which is the convention in the economics discipline and various other disciplines, is to the advantage of people whose last name initials are placed early in the alphabet. As it turns out, Professor A, who has been a first author more often than Professor Z, will have published more articles and experienced afaster growth rate over the course of her career as a result of reputation and visibility. Moreover, authors know that name ordering matters and indeed take ordering seriously: Several characteristics of an author group composition determine the decision to deviate from the default alphabetic name order to a significant extent.performance measurement, incentives, economists, name ordering
„Konsensualizm – idea współczesnego procesu karnego w świetle nowelizacji Kodeksu postępowania karnego z 2013 r. oraz z 2015 r.”
No full textIn his essay the author presents the last changes in consensus institutions (conviction without a trial, voluntary submission to penalty, mediation) made to the amendment of 27 September 2013 and the amendment of 20 February 2015. The author shows the nature and extent of the changes and their importance to the development of a consensus idea in the Polish criminal trial. The aim of this article is to show the sustainable development of a consensus idea and the role of settlement in contemporary Polish criminal trial.W swoim opracowaniu autor przedstawia zmiany dokonane nowelizacją z dnia 27 września 2013 r. oraz nowelizacją z dnia 20 lutego 2015 r. w zakresie instytucji o charakterze konsensualnym (skazanie bez przeprowadzania rozprawy, dobrowolne poddanie się karze, mediacja). Wskazuje na istotę i zakres zmian oraz ich znaczenie dla rozwoju idei konsensualizmu w polskim procesie karnym. Artykuł ma na celu przedstawienie stałego rozwoju idei konsensualizm i roli porozumień karnoprocesowych we współczesnym polskim procesie karnym
„Konsensualizm – idea współczesnego procesu karnego w świetle nowelizacji Kodeksu postępowania karnego z 2013 r. oraz z 2015 r.”
No full textW swoim opracowaniu autor przedstawia zmiany dokonane nowelizacją z dnia 27 września 2013 r. oraz nowelizacją z dnia 20 lutego 2015 r. w zakresie instytucji o charakterze konsensualnym (skazanie bez przeprowadzania rozprawy, dobrowolne poddanie się karze, mediacja). Wskazuje na istotę i zakres zmian oraz ich znaczenie dla rozwoju idei konsensualizmu w polskim procesie karnym. Artykuł ma na celu przedstawienie stałego rozwoju idei konsensualizm i roli porozumień karnoprocesowych we współczesnym polskim procesie karnym.In his essay the author presents the last changes in consensus institutions (conviction without a trial, voluntary submission to penalty, mediation) made to the amendment of 27 September 2013 and the amendment of 20 February 2015. The author shows the nature and extent of the changes and their importance to the development of a consensus idea in the Polish criminal trial. The aim of this article is to show the sustainable development of a consensus idea and the role of settlement in contemporary Polish criminal trial
Reynolds number dependence of the dimensionless dissipation rate in stationary magnetohydrodynamic turbulence
No full textResults on the Reynolds number dependence of the dimensionless total dissipation rate C_ε are presented, obtained from medium to high resolution direct numerical simulations (DNSs) of mechanically forced stationary homogeneous magnetohydrodynamic (MHD) turbulence in the absence of a mean magnetic field, showing that C_ε -> const with increasing Reynolds number. Furthermore, a model equation for the Reynolds number dependence of the dimensionless dissipation rate is derived from the real-space energy balance equation by asymptotic expansion in terms of Reynolds number of the second- and third-order correlation functions of the Elsässer fields z± = u ± b. At large Reynolds numbers we find that a model of the form C_ε = C_ε,∞ + C/R describes the data well, while at lower Reynolds numbers the model needs to be extended to second order in 1/R in order to obtain a good fit to the data, where R is a generalised Reynolds number with respect to the Elsässer field z-
Imobilização de lipases em materiais poliméricos
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas.Neste trabalho, lipases de várias fontes foram imobilizadas nos polímeros poli(óxido de etileno) (PEO), poli(ácido acrílico) (Carbopol) e blendas PEO/Carbopol. Posteriormente, as atividades enzimáticas foram avaliadas em reações de esterificação do ácido láurico com n-pentanol, em meio orgânico. Parâmetros, tais como tempo e temperatura de reação, concentração de enzima no suporte e meio reacional foram avaliados. A aplicação destes suportes para esterificações enantiosseletivas de álcoois secundários foi estudada para a reação do ácido láurico com (R,S)-2-octanol, catalisada pela CCL e PSL imobilizadas em PEO. A imobilização foi realizada mediante dissolução do polímero em água e adição do biocatalisador, com posterior evaporação do solvente para formação e obtenção dos suportes. Estes foram caracterizados e a presença de enzima foi constatada através de Microscopia Eletrônica de Varredura (MEV) e análises térmicas de Termogravimetria (TG) e Calorimetria de Varredura Diferencial (DSC). Na esterificação do ácido láurico com n-pentanol, os suportes PEO/CCL e PEO/PSL apresentaram uma maior conversão em éster à medida que aumentaram o tempo, a temperatura de reação e a concentração de enzima no suporte. Na reação de esterificação enantiosseletiva, as lipases CCL e PSL foram mais seletivas a 25 °C. O R-(-)-2-octanol foi obtido com ee de 86 e 98%, respectivamente. A partir dos resultados obtidos, concluiu-se que o PEO pode ser utilizado para a imobilização de lipases, pois este polímero forma filmes homogêneos e as enzimas mantém sua atividade catalítica
Porównanie polsko-litewskiej Konstytucji z 3 maja 1791 r. z hiszpańską Konstytucją z 19 marca 1812 r.
No full textThe purpose of this article was to make a brief comparative analysis between the Spanish Constitution of 1812 and the Polish-Lithuanian Constitution of 1791. With this intention, the most characteristic features of each constitutional text were set out, and both the historical and social context prior to its promulgation and the circumstances that led to the drafting of both legal acts were analyzed. The similarities and contrasts of the political models established with both constitutions were observed, as well as the rights and freedoms recognized. Reference was also made to the founding fathers of the Constitutions and the ideological context that influenced them. Finally, the author mentioned the fate of both constitutions that were only in force for a short period of time. The article aimed to present these two legal acts that were a milestone in the constitutional and political history of each nation.Celem artykułu było przeprowadznie krótkiej analizy porównawczej hiszpańskiej Konstytucji z 1812 r. oraz polsko-litewskiej Konstytucji z 1791 r. W tym celu przedstawiono najbardziej charakterystyczne cechy każdej z nich oraz poddano analizie historyczny i społeczny kontekst poprzedzający ich ogłoszenie, a także okoliczności, które doprowadziły do opracowania projektów obu aktów prawnych. Uchwycono podobieństwa i różnice modeli politycznych oraz praw i wolności ustanowionych w obu konstytucjach. Odniesiono się też do ojców założycieli konstytucji i kontekstu ideologicznego, który na nich wpłynął. Ponadto autorka wspomina o losie obu Konstytucji, które obowiązywały jedynie przez krótki okres. Celem artykułu było przybliżenie tych dwóch aktów prawnych, stanowiących kamienie milowe w konstytucjonalnej i politycznej historii obu narodów
Self-archiving practice and the influence of publisher policies in the social sciences
No full textAuthors in different disciplines exhibit very different behaviours on the so-called ‘green’ road to open access, i.e. self-archiving. This study looks at the self-archiving behaviour of authors publishing in leading journals in six social science disciplines. It tests the hypothesis that authors are self-archiving according to the norms of their respective disciplines rather than following self-archiving policies of publishers, and that, as a result, they are self-archiving significant numbers of publisher PDF versions. It finds significant levels of
self-archiving, as well as significant self-archiving of
the publisher PDF version, in all the disciplines
investigated. Publishers’ self-archiving policies have
no influence on author self-archiving practice
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