122,403 research outputs found
Land surface data assimilation results from 2010 to 2018 between 45°N and 70°N – Data archive for "Improved Groundwater Table and L-band Brightness Temperature Estimates for Northern Hemisphere Peatlands Using New Model Physics and SMOS Observations in a Global Data Assimilation Framework"
No full textThe datasets archived here include simulation results discussed in the paper, “Improved Groundwater Table and L-band Brightness Temperature Estimates for Northern Hemisphere Peatlands Using New Model Physics and SMOS Observations in a Global Data Assimilation Framework”. The output was produced by combining peatland-specific land surface modeling (Bechtold et al., 2019b) embedded in the NASA Catchment Land Surface Model (CLSM) with L-band brightness temperature observations (SMOS), applying the data assimilation framework of the SMAP Level‐4 Soil Moisture product (Reichle et al., in press). We provide netcdf files (9-km resolution EASEv2 grid, period 2010 – 2018, and between 45°N and 70°N, NE Asia excluded) of the four experiments of the manuscript: model-only (open-loop, OL) and data assimilation (DA) for each land model version, that is CLSM without and with the use of the PEATCLSM modules. We provide three types of netcdf files:
daily_images_*.nc: Daily land states and fluxes
ObsFcstAna_images_*.nc: Brightness temperature observations, forecasts and analysis
incr_images_*.nc: Data assimilation increments
The file content is described in the file PEATCLSM_SMOS_DA_v1_Documentation.pdf
Please contact Michel Bechtold ([email protected]) for any questions.
Bechtold, M., De Lannoy, G. J. M., Reichle, R. H., & Koster, R. D. (2019a). PEAT-CLSM simulation output (Northern Peatlands) version 1. https://doi.org/10.17605/OSF.IO/E58YM
Bechtold, M., De Lannoy, G. J. M., Koster, R. D., Reichle, R. H., Mahanama, S., Bleuten, W., et al. (2019b). PEAT‐CLSM: A Specific Treatment of Peatland Hydrology in the NASA Catchment Land Surface Model. Journal of Advances in Modeling Earth Systems, 2018MS0015, 2018MS001574. https://doi.org/10.1029/2018MS001574
Reichle, R. H., Liu, Q., Koster, R. D., Crow, W. T., De Lannoy, G. J. M., Kimball, J. S., et al. (n.d.). Version 4 of the SMAP Level-4 Soil Moisture Algorithm and Data Product. Journal of Advances in Modeling Earth Systems, in press. https://doi.org/10.1029/2019MS00172
Synergus chinensis Melika, Acs & Bechtold 2014
No full textSynergus chinensis Melika, Ács & Bechtold, 2014 Figs 123–133 This species was described from north-eastern China (Beijing Province, Mentougou District, 150 km NW of Beijing), reared from unknown cynipid acorn, leaf and bud galls (Melika et al. 2004). It was later found by one of the authors (GM) in South Korea (Abe et al. 2007). Kovalev (1965) mentioned S. gallaepomiformis (Boyer de Fonscolombe) for the Far East of Russia, which was reared from asexual galls of Andricus hakonensis (= A. symbioticus, = A. attractus). We strongly doubt this identification. On the basis of the adult description given by Kovalev, these specimens belong to S. chinensis (Abe et al. 2007). Synergus chinensis falls into a subclade with S. symbioticus and can be easily distinguished from the latter by some strong diagnostic characters given in the key and in the Diagnosis to S. symbioticus. Currently known from China, South Korea and Russia.Published as part of Schwéger, Szabina, Melika, George, Tang, Chang-Ti, Bihari, Péter, Bozsó, Miklós, Stone, Graham N., Nicholls, James A. & Pénzes, Zsolt, 2015, New species of cynipid inquilines of the genus Synergus (Hymenoptera: Cynipidae: Synergini) from the Eastern Palaearctic, pp. 451-497 in Zootaxa 3999 (4) on page 485, DOI: 10.11646/zootaxa.3999.4.1, http://zenodo.org/record/24368
Cristais líquidos discóticos como semicondutores orgânicos para aplicações eletrônicas
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Física, Florianópolis, 2014Nota: Prêmio UFSC de tese 2015Os cristais líquidos (CLs) têm sido reconhecidos recentemente como promissores semicondutores para aplicações na área de eletrônica orgânica. O presente trabalho apresenta a proposta de caracterizar e investigar a potencialidade de novos materiais orgânicos com propriedades líquido-cristalinas para aplicações em dispositivos eletrônicos. Moléculas discóticas constituídas de um centro rígido aromático e cadeias laterais flexíveis vêm sendo amplamente estudada se aplicadas em dispositivos orgânicos tais como os diodos emissores de luz (OLEDs), os transistores de efeito de campo (OFETs) e os fotovoltaicos. Os CLs aliam a organização molecular dos sistemas cristalinos, necessária ao trânsito das cargas, à fluidez de um líquido, facilitando o processamento do material. Eles podem ser processados tanto a partir de solução quanto por evaporação térmica. A principal vantagem na utilização destes materiais é a possibilidade de modificar e controlar a orientação molecular através de estímulos externos, como por exemplo, pela ação de temperatura, aplicação de campos elétrico ou magnético e através de tratamentos de superfície. Com isso pode-se otimizar as suas propriedades ópticas e elétricas. Os CLs discóticos estudados neste trabalho são derivados do centro aromático perileno. Os materiais com o centro perileno vêm sendo empregados como semicondutores tipo-n e têm apresentado elevada mobilidade de carga quando aplicados em dispositivos. Neste trabalho as propriedades mesomórficas, fotofísicas, eletroquímicas e elétricas dos compostos foram investigadas. O comportamento termotrópico dos compostos foi analisado por microscopia óptica de luz polarizada(MOLP), calorimetria diferencial de varredura (DSC) e difração de raio x (DRX). As propriedades fotofísicas foram investigadas através de espectroscopia UV-Vis e espectroscopia de fluorescência. A caracterização morfológica dos filmes finos produzidos pela técnica despin-coating e evaporação térmica foi realizada usando um microscópio de força atômica (AFM). Os níveis de energia LUMO dos compostos foram estimados através da técnica de voltametria cíclica. As propriedades fotofísicas em função da temperatura mostraram uma significativa supressão da fotoluminescência na mesofase colunar causada pela forte agregação molecular do empacotamento p-stacking. As propriedades elétricas foram investigadas através da deposição dos filmes em uma típica estrutura de diodo, ITO/PEDOT:PSS/CL/Ca/Al. A mobilidade de carga foi estudada através da aplicação de um modelo teórico às curvas experimentais de densidade de corrente em função da voltagem aplicada (J/V) e comparada com a mobilidade eletrônica obtida através das técnicas de tempo de voo (TOF) e Foto-CELIV. O alinhamento homeotrópico induzido por tratamento térmico para o composto com o centro perileno diimida resultou em propriedades elétricas aprimoradas, onde foi observado um ganho de quatro ordens de grandeza para a densidade de corrente e cinco ordens de grandeza para a mobilidade. O filme fino produzido pelo processo de evaporação térmica deste composto também apresentou propriedades elétricas notáveis na estrutura de diodo, sendo superior ao desempenho do filme produzido por spin-coating antes do alinhamento. A mobilidade para o filme evaporado foi medida através da estrutura de um transistor e mostrou boa concordância com a mobilidade obtida a partir do modelo aplicado às curvas J/V. A mobilidade para o filme evaporado foi superior a mobilidade encontrada para o filme spin-coating antes do alinhamento, mas inferior a mobilidade exibida pelo filme spin-coating alinhado homeotropicamente na estrutura de diodo. Os dispositivos produzidos a partir da combinação dos dois CLs, em heterojunções de bicamada e de volume, apresentaram um melhor desempenho do que os dispositivos fabricados para os compostos individualmente.Abstract: Liquid crystals (LCs) have been recently recognized as promising semiconductors for applications in the field of organic electronics. This work presents a proposal to characterize and investigate the potential application of new organic materials with liquid-crystalline properties inelectronic devices. Discotic molecules comprising a rigid aromatic core and flexible side chains have been widely studied and applied to organic devices such as light emitting diodes (OLEDs), field effect transistors (OFETs) and photovoltaics. LCs combine the molecular organization of the crystalline systems necessary to the transit of the charge and the fluidity of a liquid, facilitating processing of the material. They can be processed either from solution or by thermal evaporation. The main advantage of using these materials is the possibility of modifying and controlling the molecular orientation by external stimuli, for example, by the action of temperature, applying electric or magnetic fields and through surface treatments. Being possible to optimize their optical and electrical properties.The discotic LCs studied in this work are derivatives of the perylene aromatic core. Materials with perylene core have been used as n-type semiconductors and have shown high mobility of charge when applied to devices. In this work the mesomorphic, photophysical, electrochemical and electrical properties of the compounds were investigated. The thermotropic behavior of the compounds was analyzed by optical polarized light microscopy (MOLP), differential scanning calorimetry (DSC) and x-ray diffraction (XRD). The photophysical properties were investigated by UV-Vis and fluorescence spectroscopy. Morphological characterization of the thin films produced by the technique of spin-coating and thermal evaporation was performed using an atomic force microscope (AFM). The LUMO energy levels of the compounds were estimated using the technique of cyclic voltammetry. The photophysical properties as a function of temperature showed a significant suppression of photoluminescence in the columnar mesophase due to the molecular aggregates caused by the strong p-stacking interactions. The electrical properties were investigated by depositing the films in a typical diode structure, ITO/PEDOT:PSS/CL/Ca/Al. The charge mobility was investigated by applying a theoretical model to experimental curves of the current density as a function of applied voltage (J/V) and compared with the electron mobility obtained by the techniques of time of flight (TOF) and Photo-CELIV. The homeotropic alignment induced by annealing for the compound perylene diimide resulted in improved electrical properties, where a gain of four orders of magnitude for the current density and five orders of magnitude in the mobility was observed. The thin film produced by thermal evaporation process of this compound also showed remarkable electrical properties in a diode structure. It was superior to the performance of the film produced by spin-coating before alignment. Mobility for the evaporated film was measured in a transistor structure and showed good agreement with the mobility obtained from the model applied to curves J/V. The mobility for the evaporated film was higher than the mobility for the spin-coating before alignment, but it was lower than the mobility exhibited by the spin-coating film after annealing in a diode structure. The devices produced from the combination of the two LCs in bilayer and bulk heterojunctions showed better performance than devices manufactured for the compounds individually
Synergus xialongmeni Melika, Acs & Bechtold 2004
No full textSynergus xialongmeni Melika, Ács & Bechtold, 2004 Figs 134–144 Currently known only from China (Beijing Province, Mentougou District, 150 km NW of Beijing), reared from unknown cynipid acorn, leaf and bud galls (Melika et al. 2004). This species, together with S. belizinellus and S. ishikarii, forms a distinct subclade and morphologically with all three species show some similarity. Diagnostic characters for all three species are given in the key and also in the Diagnosis to S. ishikarii and S. belizinellus. Based on this research we can conclude that there are currently 17 valid species of Synergus in the Eastern Palaearctic, and two species with an uncertain status (Table 2). Total: 17 valid species and 2 with uncertain statusPublished as part of Schwéger, Szabina, Melika, George, Tang, Chang-Ti, Bihari, Péter, Bozsó, Miklós, Stone, Graham N., Nicholls, James A. & Pénzes, Zsolt, 2015, New species of cynipid inquilines of the genus Synergus (Hymenoptera: Cynipidae: Synergini) from the Eastern Palaearctic, pp. 451-497 in Zootaxa 3999 (4) on page 491, DOI: 10.11646/zootaxa.3999.4.1, http://zenodo.org/record/24368
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Du patriotisme allemand
No full textWieland , Merle Jean-Christophe, Thouard Denis, Bechtold Evelyne, Argelès Daniel, Kauffmann Elisabeth. Du patriotisme allemand. In: Cahiers de Fontenay, n°58-59, 1990. Philosophie et politique en Allemagne (XVIIIe -XXe siècle) pp. 19-28
The vanishing author in computer-generated works: a critical analysis of recent Australian case law
No full textAbstract
The use of software is ubiquitous in the creation of many copyright works, yet the requirement in copyright law that every work have a human author who engages in independent intellectual effort means that its use may prevent copyright subsistence. Several recent Australian cases have refocused attention on authorship as an essential criterion of copyright subsistence, and these cases suggest that much computer-produced output may be authorless and thus lack copyright protection. This article, the first in a two-part series, analyses how each case deals with the question of authorship of computer-produced works and why the use of software diminishes copyright protection for a significant number of computer-generated works. The article critiques the application of conventional notions of human authorship developed in the pre-computer age to modern productions and suggests alternative approaches to authorship that satisfy both the major objectives of copyright policy and the need to adapt to the computer age. The article argues that, without a broader judicial approach to authorship of computer-generated works, Parliament must remedy the lacuna in protection for these ‘authorless’ works. Possible solutions for reform are suggested. In a forthcoming article, the author comprehensively examines those reform proposals
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Melanchthons Briefwechsel, Band T 10 : Texte 2605-2865 (1541). Bearbeitet von Christine Mundhenk, Marion Bechtold, Matthias Dall’Asta, Heidi Hein und Simone Kurz, Stuttgart – Bad Cannstatt, Frommann-Holzboog, 2009
No full textArnold Matthieu. Melanchthons Briefwechsel, Band T 10 : Texte 2605-2865 (1541). Bearbeitet von Christine Mundhenk, Marion Bechtold, Matthias Dall’Asta, Heidi Hein und Simone Kurz, Stuttgart – Bad Cannstatt, Frommann-Holzboog, 2009. In: Revue d'histoire et de philosophie religieuses, 90e année n°4, Octobre-Décembre 2010. p. 578
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