1,721,029 research outputs found
Thermal properties and physical ageing of poly (l-lactic acid)
No full textPoly(l-lactic acid) (PLLA) was investigated by differential scanning calorimetry and dynamic mechanical and dielectric spectroscopies. In the dynamic mechanical and dielectric spectra no secondary relaxations were observed below the glass-to-rubber transition (70°C at 3 Hz). The thermal history strongly affects the physical properties of PLLA, inducing changes of crystalline: amorphous ratio as well as large physical ageing effects on the glassy amorphous phase. This latter phenomenon is clearly observed as a consequence of room-temperature storage and develops at a faster rate as the ageing temperature Ta approaches Tg. Ageing experiments carried out at the same undercooling (ΔT = Tg - Ta) on PLLA samples of different molecular weight ( M ̄v = 5300, 20 000, 691 000) show that a decrease in molecular weight increases the magnitude of the enthalpy relaxation at the glass transition. © 1992
Comparison between adjustment and staircase methods for evaluating body size distortion and dissatisfaction.
No full textINVESTIGATION OF SOME PENTASUBSTITUTED 1,4-DIHYDROPYRIDINES BY MEANS OF FAST ATOM BOMBARDMENT, CHEMICAL IONIZATION AND ELECTRON IMPACT MASS SPECTROMETRY
No full textLACIDIPINE: MASS SPECTROMETRIC CHARACTERIZATION OF A NEW DIHYDROPYRIDINE CALCIUM ANTAGONIST AND SEVERAL OF ITS STANDARD METABOLITES
No full textWhat the study of spinal cord injured patients can tell us about the significance of the body in cognition
Full text linkAlthough in the last three decades philosophers, psychologists and neuroscientists have produced numerous studies on human cognition, the debate concerning its nature is still heated and current views on the subject are somewhat antithetical. On the one hand, there are those who adhere to a view implying ‘disembodiment’ which suggests that cognition is based entirely on symbolic processes. On the other hand, a family of theories referred to as the Embodied Cognition Theories (ECT) postulate that creating and maintaining cognition is linked with varying degrees of inherence to somatosensory and motor representations. Spinal cord injury induces a massive body-brain disconnection with the loss of sensory and motor bodily functions below the lesion level but without directly affecting the brain. Thus, SCI may represent an optimal model for testing the role of the body in cognition. In this review, we describe post-lesional cognitive modifications in relation to body, space and action representations and various instances of ECT. We discuss the interaction between body-grounded and symbolic processes in adulthood with relevant modifications after body-brain disconnection
Body Form Modulates the Prediction of Human and Artificial Behaviour from Gaze Observation
Full text linkThe future of human-robot collaboration relies on people's ability to understand and predict robots' actions. The machine-like appearance of robots, as well as contextual information, may influence people's ability to anticipate the behaviour of robots. We conducted six separate experiments to investigate how spatial cues and task instructions modulate people's ability to understand what a robot is doing. Participants observed goal-directed and non-goal directed gaze shifts made by human and robot agents, as well as directional cues displayed by a triangle. We report that biasing an observer's attention, by showing just one object an agent can interact with, can improve people's ability to understand what humanoid robots will do. Crucially, this cue had no impact on people's ability to predict the upcoming behaviour of the triangle. Moreover, task instructions that focus on the visual and motor consequences of the observed gaze were found to influence mentalising abilities. We suggest that the human-like shape of an agent and its physical capabilities facilitate the prediction of an upcoming action. The reported findings expand current models of gaze perception and may have important implications for human-human and human-robot collaboration
INVESTIGATION OF LACIDIPINE, A NEW 1,4-DIHYDROPYRIDINE AGENT AND THREE CHEMICALLY RELATED COMPOUNDS BY MEANS OF CHEMICAL IONIZATION MASS SPECTROMETRY AND COLLISION INDUCED DISSOCIATION
No full textSUITABILITY OF FAST-ION BOMBARDMENT MASS SPECTROMETRY FOR THE INVESTIGATION OF 11,4-DIHYDROPYRIDINE DERIVATIVES
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