Search results for "Faces"

MODIFICATION OF HYDROPHOBIC SURFACE WITH POLYASPARTAMIDE-BASED POLYCATIONS FOR BIOMEDICAL APPLICATION

2013

A convenient way for the achievement of polymer-based solid materials for specific biomedical applications is grafting the appropriate macromolecules onto the surfaces in order to confer them specific properties. To date many approaches have been used to covalently modify polymeric surfaces, and among them chemoselective coupling reactions, usually referred as “click” reactions, gained much attention thanks to simple procedure with high reaction rate under mild reaction conditions (at normal temperature and pressure) [1]. In particular, radical-initiated thiol-yne “photo-click” chemistry has been demonstrated as an effective way to functionalize efficiently surfaces. This method gives also …

Calcium mediated polyelectrolyte adsorption on like-charged surfaces.

2011

International audience; Monte Carlo simulations within the primitive model of calcium-mediated adsorption of linear and comb polyelectrolytes onto like-charged surfaces are described, focusing on the effect of calcium and polyion concentrations as well as on the ion pairing between polymers and calcium ions. We use a combination of Monte Carlo simulations and experimental data from titration and calcium binding to quantify the ion pairing. The polymer adsorption is shown to occur as a result of surface overcharging by Ca2+ and ion pairing between charged monomers and Ca2+. In agreement with experimental observations, the simulations predict that the polymer adsorption isotherm goes through …

Effect of the extensional flow on the properties of oriented nanocomposite films for twist wrapping

2011

In this study, we examined the mechanical behavior of nanocomposite films based on polyethylene (PE) and pristine PE films. The films were prepared by film blowing and were then cold-drawn at low temperature. The experimental results show that cold drawing significantly enhanced the orientation; with increasing draw ratio (DR), the elastic modulus and tensile strength of the PE films strongly increased, particularly in the presence of the organoclay. To obtain polymeric films suitable for twist wrapping, the films must be sufficiently stiff so that no shrinkage or elastic recovery occur during or after twisting. The elongation at break and the yield strain sharply decreased with orientation…

Hydro-mechanical modelling of a natural slope affected by a multiple slip surface failure mechanism

2009

A coupled hydro-mechanical formulation is presented for the analysis of landslide motion during crisis episodes. The mathematical formulation is used to model a natural slope affected by a multiple slip surface failure mechanism, in which pore water pressure evolution was identified as the main cause for movement accelerations. An elasto-plastic constitutive model is adopted for the behaviour of slip surfaces. Material parameters are obtained by combining the available laboratory tests and the back analysis of some crisis episodes. After being calibrated and validated, the model is applied to improve the understanding of the physical processes involved and to predict the landslide behaviour…

Human conceptualisation processes as a perspective on the design and evaluation of user-interfaces

2013

The Effect of Predator Population Dynamics on Batesian Mimicry Complexes.

2022

Understanding Batesian mimicry is a classic problem in evolutionary biology. In Batesian mimicry, a defended species (the model) is mimicked by an undefended species (the mimic). Prior theories have emphasized the role of predator behavior and learning as well as evolution in model-mimic complexes but have not examined the role of population dynamics in potentially governing the relative abundances and even persistence of model-mimic systems. Here, we examined the effect of the population dynamics of predators and alternative prey on the prevalence of warning-signaling prey composed of models and mimics. Using optimal foraging theory and signal detection theory, we found that the inclusion …

Conformational Dynamics of the Dengue Virus Protease Revealed by Fluorescence Correlation and Single-Molecule FRET Studies.

2021

The dengue virus protease (DENV-PR) represents an attractive target for counteracting DENV infections. It is generally assumed that DENV-PR can exist in an open and a closed conformation and that active site directed ligands stabilize the closed state. While crystal structures of both the open and the closed conformation were successfully resolved, information about the prevalence of these conformations in solution remains elusive. Herein, we address the question of whether there is an equilibrium between different conformations in solution which can be influenced by addition of a competitive inhibitor. To this end, DENV-PR was statistically labeled by two dye molecules constituting a FRET …

不同情绪面孔的视觉工作记忆表现差异 [The Performance Difference of Visual Working Memory between Various Emotional Faces]

2022

Among social-emotional stimuli, emotional faces occupy an important position, which specifically refer to human faces with certain facial expressions. The visual working memory is a limited workspace where information can be saved online and can be accessed and operated by advanced cognitive function during the maintenance period. A large number of behavioral and electrophysiological studies have shown that there are differences in visual working memory performance of different emotional faces. Specifically, angry faces can enhance the visual working memory performance; fearful faces may cause some damage to visual working memory; sad faces will impair face recognition encoding in visual wo…

Gestural Agency in Human-Machine Musical Interaction

2017

Musical technologies are evolving in such a way that they start to resemble the people that use them. In this vision it seems pertinent to abandon the conception of musicians as users of musical instruments in favor of machines and humans interacting to make music. Both the machine and the human can be modeled as embodied cognitive agents that comprise a network of musical gestures. These gestures are multi-modal signals that allow the agents to exert influence upon each other towards making music. This standpoint integrates traditional and novel music-making technologies, towards a better understanding of musical interaction. peerReviewed

Who Controls Who? Embodied Control Within Human–Technology Choreographies

2017

In this article we explore issues of embodied control that relate to current and future technologies in which body movements function as an instrument of control. Instead of just seeing ourselves in control, it is time to consider how these technologies actually control our moving bodies and transform our lived spaces. By shifting the focus from devices to choreographies among devices, we perform a theoretical analysis of the multidimensional aspects that reside within embodied interaction with technology. We suggest that it is beneficial to acknowledge and reformulate the phenomena of embodied control that go beyond the instrumental user-to-device control scheme. Drawing upon the phenomeno…