Detecting subtle yet fast skeletal muscle contractions with ultrasoft and durable graphene-based cellular materials

Human bodily movements are primarily controlled by the contractions of skeletal muscles. Unlike joint or skeletal movements that are generally performed in the large displacement range, the contractions of the skeletal muscles that underpin these movements are subtle in intensity yet high in frequency. This subtlety of movement makes it a formidable challenge to develop wearable and durable soft materials to electrically monitor such motions with high fidelity for the purpose of, for example, muscle/neuromuscular disease diagnosis. Here we report that an intrinsically fragile ultralow-density graphene-based cellular monolith sandwiched between silicone rubbers can exhibit a highly effective stress and strain transfer mechanism at its interface with the rubber, with a remarkable improvement in stretchability (>100%). In particular, this hybrid also exhibits a highly sensitive, broadband-frequency electrical response (up to 180 Hz) for a wide range of strains. By correlating the mechanical signal of muscle movements obtained from this hybrid material with electromyography, we demonstrate that the strain sensor based on this hybrid material may provide a new, soft and wearable mechanomyography approach for real-time monitoring of complex neuromuscular–skeletal interactions in a broad range of healthcare and human–machine interface applications. This work also provides a new architecture-enabled functional soft material platform for wearable electronics.     

Effect of response mode and subject characteristics on learning in programed instruction

60 Ss took a program in one of three ways: writing the answer, “thinking” the answer without writing it, or reading a program with the answers filled in. Results indicated no significant differences among the groups on two measures of amount learned. Low positive correlations were obtained between amount learned and IQ and reading comprehension of the Ss. Percent error on test frames within the program was negatively correlated with adjusted gain scores (r = −0.71). Results were also related to possible pragmatic applications.     

Cultural studies through education: moments of pedagogy and pragmatics

Abstract

Our main concern is to see if cultural studies can intervene more productively in the dominant educational processes, in ways that align with the sustainable interests of its critical project. As cynicism becomes the commonplace ‘distinction’ of our young graduates, we raise two questions: why should cultural studies be concerned with the spread of cynicism within our own institutional and pedagogic space? And what would be the implications of such critical reflection on our current practices, as scholar and teacher of this critical project? The paper draws on our continual engagement with the curriculum reform of secondary school subjects (Integrated Humanities and Liberal Studies) in Hong Kong, in an attempt to explore the limits and opportunities of education as social practice, as well as the effectivity of cultural studies within the contemporary contexts and crises of education. First we describe how taking part in the specific school reform projects has begun to change the critical and pedagogic orientation of cultural studies we do at the university. Then we discuss the implications of our recent experiments in doing cultural studies in and with the local schools. In all, we want to examine what brings us to our own search for a certain ‘politics of hope’, by re‐thinking and re‐mapping cultural studies as a collective, pragmatic programme in the local educational set‐up. For, without a constructive pragmatics, the students of cultural studies cannot be expected to work effectively across diverse institutional settings. Thus, criticism and the production of critical knowledge in the contemporary academy would go on to foster a state of cynicism among its graduates and the ‘stakeholders’ concerned. Cultural studies, we believe, can make itself more useful through concrete ways of mediating its expertise in the complex processes of education. As such, we emphasize the contemporary relevance and uses of cultural studies for educational transformation.