201 research outputs found
Multi-physics continuum modelling approaches for metal powder additive manufacturing: a review
No full textThis paper aims to present a systematic approach in the literature survey related to metal additive manufacturing (AM) processes and its multi-physics continuum modelling approach for its better understanding.
Design/methodology/approach
A systematic review of the literature available in the area of continuum modelling practices adopted for the powder bed fusion (PBF) AM processes for the deposition of powder layer over the substrate along with quantification of residual stress and distortion. Discrete element method (DEM) and finite element method (FEM) approaches have been reviewed for the deposition of powder layer and thermo-mechanical modelling, respectively. Further, thermo-mechanical modelling adopted for the PBF AM process have been discussed in detail with its constituents. Finally, on the basis of prediction through thermo-mechanical models and experimental validation, distortion mitigation/minimisation techniques applied in PBF AM processes have been reviewed to provide a future direction in the field.
Findings
The findings of this paper are the future directions for the implementation and modification of the continuum modelling approaches applied to PBF AM processes. On the basis of the extensive review in the domain, gaps are recommended for future work for the betterment of modelling approach.
Research limitations/implications
This paper is limited to review only the modelling approach adopted by the PBF AM processes, i.e. modelling techniques (DEM approach) used for the deposition of powder layer and macro-models at process scale for the prediction of residual stress and distortion in the component. Modelling of microstructure and grain growth has not been included in this paper.
Originality/value
This paper presents an extensive review of the FEM approach adopted for the prediction of residual stress and distortion in the PBF AM processes which sets the platform for the development of distortion mitigation techniques. An extensive review of distortion mitigation techniques has been presented in the last section of the paper, which has not been reviewed yet
Electronic Healthcare Data Collection and Pay-for-Performance: Translating Theory into Practice
No full textWith insight grounded in his work for a national data collection consortium and as Vice President of Quality and Outcomes at the Children\u27s Hospital of Wisconsin, the author connects the theory of pay-for-performance to the realities of its implementation. The author expands the Diagnosing the Data conversation by describing the challenges of collecting meaningful data and by addressing the potential legal issues that data use raises. Drawing on his national and local experience, the author concludes with suggestions for adopting data collection programs that are both clinically relevant and scientifically reliable
Rapidly reversible visual loss in posterior reversible encephalopathy syndrome: An ophthalmologist's enigma
No full textPosterior reversible encephalopathy Syndrome (PRES) may present with a sudden onset reversible visual loss under special visual conditions. Such patients' may initially be misdiagnosed as Malingering. Ophthalmologists may be the first physicians to be confronted by such patients. Hence, a knowledge of this condition is vital to diagnosis and management of such conditions
Spontaneous ophthalmic artery occlusion in children due to Hyperhomocysteinemia
No full textOphthalmic artery occlusion usually presents as a sudden onset profound decrease in vision in the middle-aged and elderly patients following periocular procedures (retrobulbar injection/glabellar fat injection), embolism from the heart or after prolonged systemic surgery. In this report, we describe three children with spontaneous ophthalmic artery occlusion who presented with unilateral loss of vision and diagnosed elsewhere as optic atrophy whose detailed history and examination were suggestive of ophthalmic artery occlusion. Detailed systemic and laboratory evaluation revealed hyperhomocysteinemia as the only potential risk factor. To the best of our knowledge, this is the first report of the association of hyperhomocysteinemia and spontaneous ophthalmic artery occlusion
Epidemiological profile and spatio-temporal pattern of infant deaths in a district of North India during 2016-2019
No full textBackground: Infant mortality is an important health indicator of a population given its strong link to socioeconomic status, health service access, and quality and maternal health. The declining trend of Infant Mortality Rate has been observed in India where it reduced from 89 deaths per 1000 live births in 1990 to 28 deaths per 1000d live births in 2019. Most of the studies regarding the trend of infant mortality are state-based, however, state-level infant mortality has masked the intradistrict clustering of individual infant deaths. Hence, this study was planned with an objective to study the trend of infant mortality at the district level. Material and Methods: A retrospective study was conducted in the district Rohtak of Haryana using the data collected regarding infant deaths. The collected data regarding addresses were geocoded. The resulting layer was then analyzed using QGIS v3.10. The descriptive data was analyzed using SPSS v20.0. Result: In total, 1336 infant deaths during the study period were included. A declining trend of infant mortality was observed over the study period. The number of grids (25 km2) reduced from 18 in 2016 to 10 in 2019 depicting a reduction in the areas with more than expected count. Conclusion: This study emphasizes on the importance of using the geographic information science technique in identifying local hotspots within the district so as to find areas that need more support and observation
Pulsatile enophthalmos, severe esotropia, kinked optic nerve and visual loss in neurofibromatosis type-1
No full textNeurofibromatosis Type I if associated with aplasia of greater wing of sphenoid may be associated with a pulsatile exophthalmos. However, very rarely it may be associated with a pulsatile enophthalmos. This clinical image describes a rare presentation with pulsatile enophthalmos, esotropia and kinking of the optic nerve due to neurofibomatosis type I
Metal Organic Frameworks for Gas-phase Capacitive Sensing
No full textOLD ChemE/Organic Materials and Interface
Isolated abducens nerve palsy with hyperhomocysteinemia: Association and outcomes
No full textIschemic abducens nerve palsy usually presents as isolated cranial nerve palsy in the middle aged and elderly patients with known risk factors such as diabetes mellitus, hypertension, dyslipidemia, carotid artery disease, etc., In this report, we describe four patients with isolated abducens nerve palsy who presented with an acute onset diplopia whose detailed history and examination were suggestive of an ischemic etiology. Detailed systemic and laboratory evaluation revealed hyperhomocysteinemia as the only potential risk factor. To the best of our knowledge this is the first report of association of hyperhomocysteinemia and isolated abducens nerve palsy
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