7,024 research outputs found
The Effect of Motivations on Social Indirect Reciprocity: an Experimental Analysis
This paper investigates the effects of motivations on the perceived kindness of an action within the context of strong social indirect reci- procity. We test experimentally the hypothesis that, for a given dis- tributional outcome, an action is perceived by a third party to be less kind if it can be strategically motivated. The results do not support this hypothesis: social indirect reciprocity is indeed found to be signif- icantly stronger when strategic motivations cannot be ruled out. We interpret these findings as an indication of the role played by team reasoning in explaining reciprocal behavior.Indirect Reciprocity, Motivations, Social Preferences, Laboratory Experiments
Synthesis, optimization and 3D bioprinting of gelatin methacrylate hydrogels for cell culture studies
Sintesi, ottimizzazione e stampa 3D di hydrogel a base di gelatina metacrilata al fine di studiare il comportamento e la migrazione di cellule tumorali di Neuroblastoma seminate al suo interno.openEmbargo temporaneo per motivi editorial
Influence of OH- concentration on the illitization of kaolinite at high pressure
The products of hydrothermal reactions of kaolinite at 300°C and 1000 bars were studied in KOH solutions covering an OH- concentration, [OH-], of 1M to 3.5M. XRD patterns indicated a notable influence of the [OH-] on the reaction. At [OH]≥3M, the only stable phase was muscovite/illite. The content of muscovite/illite was calculated from the analysis of the diagnostic 060 reflections of kaolinite and muscovite/illite. The results showed a linear dependence of kaolinite and muscovite/illite contents with [OH-]. 27Al MAS NMR spectroscopy revealed the formation of small nuclei of K-F zeolite at high [OH-]. Finally, modelling of the 29Si MAS NMR spectra indicated that the Si/Al ratio of the muscovite/illite formed was very close to that of muscovite, at least in the mineral formed at low [OH-]. In good agreement with the XRD data, the quantification of the reaction products by 29Si MAS NMR indicated a linear decrease of the kaolinite content with increasing OH- concentration.Dirección General de Investigación CientÃfica y Técnica CTQ2007-63297Junta de AndalucÃa P06-FQM-0217
Myopic or Farsighted? An Experiment on Network Formation
Pairwise stability (Jackson and Wolinsky, 1996) is the standard stability concept in network formation. It assumes myopic behavior of the agents in the sense that they do not forecast how others might react to their actions. Assuming that agents are farsighted, related stability concepts have been proposed. We design a simple network formation experiment to test these theories. Our results provide support for farsighted stability and strongly reject the idea of myopic behavior.Network Formation, Experiment, Myopic and Farsighted Stability
Removal of electrostatic artifacts in magnetic force microscopy by controlled magnetization of the tip: application to superparamagnetic nanoparticles
Magnetic force microscopy (MFM) has been demonstrated as valuable technique for the
characterization of magnetic nanomaterials. To be analyzed by MFM techniques, nanomaterials
are generally deposited on flat substrates, resulting in an additional contrast in MFM images due to
unavoidable heterogeneous electrostatic tip-sample interactions, which cannot be easily distinguished
from the magnetic one. In order to correctly interpret MFM data, a method to remove the electrostatic
contributions from MFM images is needed. In this work, we propose a new MFM technique, called
controlled magnetization MFM (CM-MFM), based on the in situ control of the probe magnetization
state, which allows the evaluation and the elimination of electrostatic contribution in MFM images. The
effectiveness of the technique is demonstrated through a challenging case study, i.e., the analysis of
superparamagnetic nanoparticles in absence of applied external magnetic field. Our CM-MFM technique
allowed us to acquire magnetic images depurated of the electrostatic contributions, which revealed
that the magnetic field generated by the tip is sufficient to completely orient the superparamagnetic
nanoparticles and that the magnetic tip-sample interaction is describable through simple models once
the electrostatic artifacts are removed
The surgical point of view about persistent air leaks: prevention first
No abstract availabl
Myopic or farsighted? An experiment on network formation
Pairwise stability (Jackson and Wolinsky, 1996) is the standard stability concept in network formation. It assumes myopic behavior of the agents in the sense that they do not forecast how others might react to their actions. Assuming that agents are farsighted, related stability concepts have been proposed. We design a simple network formation experiment to test these theories. Our results provide support for farsighted stability and strongly reject the idea of myopic behavior.Experiment, myopic and farsighted stability and network formation
Aiding applicants: Leveling the playing field within the immediate acceptance mechanism
In school choice problems, the widely used manipulable Immediate Acceptance mechanism (IA) disadvantages unsophisticated applicants, but may ex-ante Pareto dominate any strategy-proof alternative. In these cases, it may be preferable to aid applicants within IA, rather than to abandon it. In a laboratory experiment, we first document a substantial gap in strategy choices and outcomes between subjects of higher and lower cognitive ability under IA. We then test whether disclosing information on past applications levels the playing field. The treatment is effective in partially reducing the gap between applicants of above- and below-median cognitive ability and in curbing ability segregation across schools, but may leave the least able applicants further behind
Vena cava anomalies in thoracic surgery
Background: Vena cava anomalies are a rare group of anatomical variations due to an incorrect development of the
superior or inferior vena cava during fetal life. They generally show no clinical relevance and the diagnosis is done due
to the association with congenital heart diseases in most of cases. However, preoperative identification of these anomalies
is mandatory for surgeons to proper surgical planning. If not recognized, lethal complications may occur, as already reported
in literature.
Case presentation: We report a case series of three different unidentified vena cava anomalies in patients undergoing lung
resection. These unrecognized anomalies led to minor complications in two cases and required an accurate intraoperative
evaluation in another.
A careful retrospective evaluation of preoperative radiological images showed the anomalies.
Conclusions: A careful evaluation of the vena cava anatomy at pre-operative imaging is mandatory for thoracic surgeons to
properly plan the surgery and avoid complications
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