36 research outputs found
Heterogeneity of discontinuous carbon fibre composites: damage initiation captured by Digital Image Correlation
This paper aims to identify architectural features which lead to damage initiation and failure in discontinuous carbon fibre composites formed from randomly orientated bundles. A novel multi-camera digital image correlation system was used to simultaneously view strain fields from opposing surfaces of coupons, in order to map progression of failure.
The highest strain concentrations were found to occur when the ends of fibre bundles aligned in the direction of loading coincided with underlying transverse bundles. The failure plane was observed to grow between a number of strain concentrations at critical features, coalescing sites of damage to create the final fracture surface. Although potential failure sites can be detected at low global strains in the form of strain concentrations, the strain field observed at low applied loads cannot be extrapolated to reliably predict final failure
Spatio-temporal assessment of illicit drug use at large scale: evidence from 7 years of international wastewater monitoring
Spatio-temporal assessment of illicit drug use at large scale: evidence from 7 years of international wastewater monitoring
TRY plant trait database â enhanced coverage and open access
Plant traitsâthe morphological, anatomical, physiological, biochemical and phenological characteristics of plantsâdetermine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodiversity conservation, ecosystem and landscape management, restoration, biogeography and earth system modelling. Since its foundation in 2007, the TRY database of plant traits has grown continuously. It now provides unprecedented data coverage under an open access data policy and is the main plant trait database used by the research community worldwide. Increasingly, the TRY database also supports new frontiers of traitâbased plant research, including the identification of data gaps and the subsequent mobilization or measurement of new data. To support this development, in this article we evaluate the extent of the trait data compiled in TRY and analyse emerging patterns of data coverage and representativeness. Best species coverage is achieved for categorical traitsâalmost complete coverage for âplant growth formâ. However, most traits relevant for ecology and vegetation modelling are characterized by continuous intraspecific variation and traitâenvironmental relationships. These traits have to be measured on individual plants in their respective environment. Despite unprecedented data coverage, we observe a humbling lack of completeness and representativeness of these continuous traits in many aspects. We, therefore, conclude that reducing data gaps and biases in the TRY database remains a key challenge and requires a coordinated approach to data mobilization and trait measurements. This can only be achieved in collaboration with other initiatives
Enterocolitis necrotizante en reciĂ©n nacidos ingresados en el Servicio de NeonatologĂa del Hospital Escuela "Carlos Roberto Huembes" en el perĂodo comprendido de Enero 2011 a Diciembre 2013
La enterocolitis necrotizante en el reciĂ©n nacido presenta un amplio espectro de manifestaciones clĂnicas, caracterizĂĄndose principalmente por la trĂada de distensiĂłn abdominal, sangramiento gastrointestinal y neumatosis intestinal. A pesar del avance en el cuidado intensivo neonatal, persiste como una enfermedad grave, que afecta habitualmente al reciĂ©n nacido pretĂ©rmino, especialmente de muy bajo peso
Problem-based teaching of interaction design to fresh minds: Lessons from integrating experiential interactive prototyping in a course on interaction design and user experience research
Industrial DesignIndustrial Design Engineerin
The axial dependence of the cathode current density in the longitudinal hollow cathode discharge
Alleviation of acquired stuttering with human centremedian thalamic stimulation.
Despite many investigations, the cerebral mechanism for stuttering remains unknown. Recently, increased attention has been paid to acquired stuttering of adult onset in the hope that the events associated with it might provide clues to the biological mechanism underlying stuttering. This attention has focused exclusively on the cortical substrates. We present our observations of acquired dysfluency, presumably of subcortical origin in a neurosurgical subject with intractable pain. The stuttering was relieved by thalamic electric stimulation. The effect of thalamic stimulation on the stuttering suggests that the pathophysiology of transient asynchronisation in the balancing and sequencing of multiple impulses is amenable to a diffusely orchestrated functional tuning of the thalamic and brainstem implicated subcortical structures and pathways