85 research outputs found
SHeLA: Scalable Heterogeneous Layered Attestation
No full textsponsorship: This work was supported in part by EU LOCARD Project under Grant H2020-SU-SEC-2018-832735, in part by the Central Europe Leuven Strategic Alliance under Grant CELSA/17/033, and in part by the Flemish Government under Grant G0E0719N. The work of M. M. Rabbani was supported by Fondazione Bruno Kessler Fund. The work of M. Conti was supported by the Marie Curie Fellowship through European Commission under Agreement PCIG11-GA-2012-321980. (Corresponding author: Md Masoom Rabbani.) (EU LOCARD Project under Grant H2020-SU-SEC-2018|832735, Central Europe Leuven Strategic Alliance|CELSA/17/033, Flemish Government|G0E0719N, Fondazione Bruno Kessler Fund, Marie Curie Fellowship through European Commission|PCIG11-GA-2012-321980)status: Publishe
Expanding Multilevel Profile Analysis for Person Perception Research
No full textThis project will involve multiple consecutive pre-registrations. Its ultimate objective is to expand multilevel profile analyses (MPA) (Furr, 2008; Biesanz, 2010; Wessels et al., 2020) by incorporating several additional item characteristics besides social desirability. We expect these item characteristics to interact with a variety of perceiver-, target- and dyad-characteristics, so incorporating them might help increase the proportion of variance explained by MPA of person perception data significantly
Interception of radionuclides by planophile crops: A simple semi-empirical modelling approach in case of nuclear accident fallout
No full textShortly after an atmospheric release, the interception of radionuclides by crop canopies represents the main uptake pathway leading to food chain contamination. The food chain models currently used in European emergency decision support systems require a large number of input parameters, which inevitably leads to high model complexity. In this study, we have established a new relationship for wet deposited radionuclides to simplify the current modelling approaches. This relationship is based on the hypothesis that the stage of plant development is the key factor governing the interception of radionuclides by crops having horizontally oriented leaves (planophile crops). The interception fraction (f) and the leaf area index normalized (f(LAI)) and mass normalized (f(B)) interception fractions were assessed for spinach (Spinacia oleracea) and radish (Raphanus sativus) at different stages of plant development and for different contamination treatments and plant densities. A database of 191 f values for Cs-137 and Th-229 was built and complemented with existing literature covering various radionuclides and crops with similar canopy structure. The overall f increased with the plant growth, while the reverse was observed for f(B). The f(LAI) significantly decreased by doubling the contaminated rainfall deposited. Fitting a multiple linear regression to predict the f value as a function of the standing biomass (B), and the radionuclide form (anion and cation) led to a better estimation of the interception (R-2 = 81%) than the ECOSYS-87 model (R-2 = 35%). Hence, the simplified modelling approach here proposed seems to be a suitable risk assessment tool as fewer parameters will minimize the model complexity and facilitate the decision-making procedures in case of emergencies, when countermeasures need to be identified and implemented promptly. (C) 2020 Elsevier Ltd. All rights reserved.The authors wish to thank dr. Gerard Prohl (International € Atomic Energy Agency) for proof reading the article, dr. Ella Roelant (University of Antwerp) for providing statistical and modelling assistance, dr. Diederik Jacques (SCK CEN) for his contribution to modeling the speciation of radionuclides, the lab-technicians Axel Van Gompel and Robin Nauts (Biosphere Impact Study, SCK CEN) for helping during laboratory activities, and the ing. Leen Verheyen
(Low-level Radiactivity Measurements, SCK CEN), expert in gamma spectrometry. This work was funded by the Belgian Nuclear Research Centre (SCK CEN) as PhD grant for Antonella CristinaCristina, A (corresponding author), Belgian Nucl Res Ctr SCK CEN, Fdn Publ Util, Biosphere Impact Studies, B-2400 Mol, Belgium ; Univ Antwerp, Dept Biosci Engn, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
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Self-healing of thermal cracks in sandwich panels
No full textSandwich panels are prefabricated, insulated concrete wall elements, which are sensitive to thermal cracking due to their composition (concrete outer cladding – insulation – concrete inner cladding). During hot days, the temperature of the outer concrete layer can rise up to ~ 60°C and the temperature difference between inner and outer layer causes crack formation in the outer concrete layer. Since cracking impairs the durability of concrete (e.g. accelerated corrosion of reinforcement steel by carbonation or chloride ingress), the aim of this research project is to regain impermeability and prevent esthetical damage through incorporation of self-healing capabilities.
At first, different healing agents (polyurethane (PU) and water repellent agent (WRA)) were screened based on their ability to regain impermeability and their behaviour upon reloading of cracked and healed samples. Two types of PU and three types of WRA were then selected to be applied in a real scale test.
For the real-scale test, the different healing agents were encapsulated by glass capsules and embedded in different zones in the outer layer of a sandwich panel (7.59 m x 1.20 m). After about 14 days, the test setup was built and the outer layer of the self-healing sandwich panel was thermally loaded up to temperatures of ~ 60°C for 9 hours per day. The temperature at the inner layer was kept constant at ~ 21°C. Due to the temperature difference, the panel bended, cracking occurred in the outer cladding, capsules broke and the healing agent was released. Some healing agents leaked out of the crack and left stains behind. Adaptation of the capsule volume, viscosity of the healing agent or concrete cover thickness over the capsules could solve this problem. PU and WRA were able to reduce the water permeability of cracks. Cracks treated with WRA remained water tight upon reloading, while PU can lose their bond with the crack surface resulting in an increased water absorption. In future research, more elastic polyurethanes, with a high bond strength to the concrete matrix, will be tested in order to solve this problem
Resistance of cracked concrete healed by means of polyurethane against chloride penetration
No full textA lot of damage is reported for constructions in marine environments. Marine environments are very aggressive, because of the high chloride concentration in sea water. Chlorides affect durability by initiating corrosion of the reinforcement steel. When cracks appear in the concrete structures, chlorides will penetrate faster and will initiate corrosion. A possible solution is self-healing concrete. Self-healing concrete has the ability to recover without external intervention. From the literature concerning self-healing concrete, it is clear that research focuses on the general concept, the mechanical properties and water permeability. Based on the water permeability it is concluded whether harmful substances will penetrate. Specific data on degradation of self-healing concrete in aggressive environments are not available. Nevertheless, these data are important to ensure a good estimation of the service life extension. In this research, the effect of the healed cracks on the resistance against chlorides was investigated for two concrete types, namely ordinary Portland cement concrete and blast-furnace slag concrete with 50 % cement replacement. Non-steady state migration tests, based on NT Build 492, were performed with uncracked, cracked and healed concrete. In our previous research, autonomous crack healing was obtained by encapsulating polyurethane healing agents. To release the healing agents, realistic cracks were formed by means of a controlled splitting test. In the current work, as a first step, cracks (notches) were manually healed with a two-component healing agent based on polyurethane. These cracks (notches) were formed by means of steel plates with a width of 0.1 and 0.3 mm. The migration tests were performed at constant setup parameters, namely 30 V and 8h. The chloride penetration front was visualized by means of the colorimetric method. By comparing the penetration depths, it seemed that concrete with a healed crack of 0.1 mm can fully regain its resistance against chloride penetration
Fundamentos literários, acidentes democráticos: Foe, de J. M. Coetzee
No full textThe article analyses J.M. Coetzee’s early novel Foe. In his book, the author reworks a foundational narrative of Western Literature in order to address issues related to the democratic demands for the end of apartheid in South Africa of the 1980s.El artículo dice la novela Foe de J. M. Coetzee. En ella, el autor reobrita una narrativa considerada fundadora de la historiografía literaria occidental con el fin de teorizar cuestiones relacionadas con las reivindicaciones democráticas hasta el fin del apartheid en Sudáfrica en la década de 1980.O artigo faz uma leitura do romance Foe, de J. M. Coetzee. Nele, o autor retrabalha uma narrativa considerada fundadora para a historiografia literária ocidental de maneira a tematizar questões relacionadas às reivindicações democráticas para o fim do apartheid na África do Sul dos anos 1980
Data
No full textThis contains the data from the "within condition" used to investigate primacy effects. A codebook provides an overview and additional information about the structure and content of the dataset
A Nuanced Perspective on How Item Features are Associated with Different Forms of Agreement
No full textPrimacy Effects in Interpersonal Perception
No full textThis project contains data, supplements, and preregistrations for "There is no primacy effect in interpersonal perception - a series of preregistered analyses using judgments of actual behavior
Supplements
No full textThis section contains supplementary material of "There is no primacy effect in interpersonal perception - a series of preregistered analyses using judgments of actual behavior"
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