Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Analytical modeling for the determination of nonlocal resonance frequencies of perforated nanobeams subjected to temperature-induced loads

International audienceThis paper is concerned with the investigation of thermal loads and small scale effects on free dynamics vibration of slender simply-supported nanobeams perforated with periodic square holes network and subjected to temperature-induced loads. The Euler–Bernoulli beam model (EBM) and shear beam model (SBM) developed for the determination of resonance frequency are derived by modifying the standard Timoshenko beam equations. The small scale effect is included by using the Eringen's nonlocal elasticity theory while the thermal loads effect is included by considering the additional axial thermal force in the standard differential equations. Numerical results are shown that the resonance frequency change, the thermal loads and the small scale effects are depended on size and number of holes. Thus, numerical results are discussed in detail for a properly investigation of the dynamic behavior of perforated nanobeams which are of interest in the development of resonant devices integrated in micro/nanoelectromichanical systems (M(N)EMS)

Analytical modeling of mechanical behavior of structures: Comparative analysis, experimental validation and numerical correction with FEM of material defects generated by anisotropic etching

This paper presented semi-analytical approach in order to investigate the influence of manufacturing process defects on the elasticity of thin microbeam. The Rayleigh Beam Model (RBM) will be analyzed and corrected using 3D FEM scripts including the effects of the cross-section shape and the under-etching. This model was tested on measurements of thin chromium microbeam of dimensions (80 × 2 × 0.95 μm3). The results show that the influence of defects is very significant for the extracted value of Young's modulus where it is very close to the measured value and it is about 279.1 GPa

Analytical modeling of mechanical behavior of structures: Comparative analysis, experimental validation and numerical correction with FEM of material defects generated by anisotropic etching

This paper presented semi-analytical approach in order to investigate the influence of manufacturing process defects on the elasticity of thin microbeam. The Rayleigh Beam Model (RBM) will be analyzed and corrected using 3D FEM scripts including the effects of the cross-section shape and the under-etching. This model was tested on measurements of thin chromium microbeam of dimensions (80 × 2 × 0.95 μm3). The results show that the influence of defects is very significant for the extracted value of Young's modulus where it is very close to the measured value and it is about 279.1 GPa

Mathematical model for the adsorption-induced nonlocal frequency shift in adatoms-nanobeam system

International audiencehis paper models and investigates the resonance frequency shift induced by the adsorption phenomena for an adatoms-nanobeam system including the small scale effect as well as rotary inertia and shear distortion effects. The Lennard-Jones (6–12) type potential is used to determine the adsorption-induced energy owing van der Waals (vdW) interaction mechanism between adatom-adatom and adatom-substrate. The small scale effect is introduced by using Eringen's nonlocal elasticity theory while the explicit expressions of inertia moment and shear force are derived from the standard Timoshenko beam equations in which the residual stress effect is accounted as an additive axial load. Numerical results showed that the resonance frequency shift is depended on each of the adsorption density, mode number and small scale effects. Thus, numerical results are discussed in detail for a proper analysis of dynamic vibration behavior of adatoms-nanobeam systems which are of interest in the development of mass sensing devices

Shear effect on dynamic behavior of microcantilever beam with manufacturing process defects

International audienceThis paper is concerned with the investigationof the shear effect on the dynamic behavior of a thinmicrocantilever beam with manufacturing process defects.Unlike the Rayleigh beam model (RBM), the Timoshenkobeam model (TBM) takes in consideration the shear effecton the resonance frequency. This effect become significantfor thin microcantilever beams with larger slendernessratios that are normally encountered in MEMS devicessuch as sensors. The TBM model is presented and analyzedby numerical simulation using Finite Element Method(FEM) to determine corrective factors for the correction ofthe effect of manufacturing process defects like the underetchingat the clamped end of the microbeam and the nonrectangularcross section of the area. A semi-analyticalapproach is proposed for the extraction of the Young’smodulus from 3D FEM simulation with COMSOL Multiphysicssoftware. This model was tested on measurementsof a thin chromium microcantilever beam of dimension

FEM Analysis for the Influence of Manufacturing Process Defects on Dynamic Behavior of Thin Chromium Microbeam

International audienceThis paper identifies and investigates the influence of technological defects of manufacturing process on the dynamic behavior of thin chromium microbeam. The analytical models will be analyzed and corrected using finite element method (FEM) to determine their validity under influence of technological defects. A semi-analytical model will be proposed for the extraction of corrective factors from 3D FEM simulation of dynamic behavior of microbeam. Final results indicate that the correction of technological defects is very significant for Cr microbeam 80x2x0.95μm3. In other hand, the corrected value of Young’s modulus is very close to the experimental results and it is about 279.1GPa

Abstracts of 1st International Conference on Computational & Applied Physics

This book contains the abstracts of the papers presented at the International Conference on Computational & Applied Physics (ICCAP’2021) Organized by the Surfaces, Interfaces and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria, held on 26–28 September 2021. The Conference had a variety of Plenary Lectures, Oral sessions, and E-Poster Presentations. Conference Title: 1st International Conference on Computational & Applied PhysicsConference Acronym: ICCAP’2021Conference Date: 26–28 September 2021Conference Location: Online (Virtual Conference)Conference Organizer: Surfaces, Interfaces, and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria