• Book : 603()
• Pub. Date : 2025
• Page : pp.155393
• Keyword :

• Book : 226()
• Pub. Date : 2025
• Page : pp.112359
• Keyword :

Abstract

The neutral beam heating system for the future international fusion experiment ITER will be based on radio-frequency driven ion sources delivering a large (≈1 × 2 m²) and homogeneous negative hydrogen or deuterium ion beam of several ten Amperes for several hundred seconds. The size scaling experiment ELISE (Extraction from a Large Ion Source Experiment) is an integral part of the R&D road-map towards the ITER neutral beam heating system. Recently, 90% of the ITER target for the extracted current density was achieved in hydrogen for 600 s, increasing the pulse length over which such current densities can be achieved by a factor of more than ten. For ten second beam pulses the ITER target current density was achieved. These breakthrough results are made possible by using a steady-state capable high-voltage power supply together with an improved version of internal potential rods and a modified topology of the magnetic filter field.

• Book : 65(1)
• Pub. Date : 2025
• Page : pp.014001
• Keyword :

• Book : 603()
• Pub. Date : 2025
• Page : pp.155378
• Keyword :

• Book : 603()
• Pub. Date : 2025
• Page : pp.155438
• Keyword :

• Book : 603()
• Pub. Date : 2025
• Page : pp.155432
• Keyword :

• Book : 226()
• Pub. Date : 2025
• Page : pp.112164
• Keyword :

• Book : 603()
• Pub. Date : 2025
• Page : pp.155481
• Keyword :

Abstract

In this study, we examine the nature of magnetohydrodynamic (MHD) Casson flow of fluid across a stretched surface in a porous material. It studies how the behaviour of Casson fluids is affected by a number of variables, including thermal radiation, chemical processes, Joule heating, and viscosity dissipation. The Keller box strategy, based on the finite difference method (FDM), is used to tackle the complex numerical problem. Graphical representations are used to show the effects of different system parts. Comprehensive tables displaying surface transfer of mass, heat, and drag rates are given for your convenience. The study focuses on how particle motion transforms kinetic energy into heat. Increased Brownian motion leads to a higher temperature profile and a reduced concentration profile. Thicker concentration profiles are created by increased Lewis number (
$$Le$$
) values and rates of chemical reactions, resulting in changes in mass transfer across fluids. This in-depth investigation focuses on the complicated interactions between various variables and how they influence the Casson fluid's behaviour in the system under study.

• Book : 8(1)
• Pub. Date : 2025
• Page : pp.36
• Keyword :

Introduction

Head and neck oncologic resections with microvascular reconstruction are lengthy and complex procedures with inefficiencies in the operating room (OR) associated with increased complications and higher costs. Multidisciplinary care has become increasingly used to provide improved care for complex patients; however, the potential role of this has not yet been studied in head and neck microvascular free flap procedures.

Methods

Patients between 2016 and 2022 treated before and after implementation of the conference were included. Primary outcome was total procedure time (TPT). Demographics, operative details, and postoperative complications were also collected.

Results

233 patients were included in the preconference group and 330 in the post‐conference group. Preconference mean (SD) age was 61.6 (12) years versus 62.9 (12) years in the post‐conference group. The post‐conference group was associated with shorter mean (SD) TPT (629 [117] vs. 719 [134] minutes), less mean (SD) estimated blood loss (ESD) (230 [201] mL vs. 306 [211] mL), fewer prolonged lCU stays (>1 day), and fewer returns to the operating room (RTOR). The post‐conference group was associated with TPT ≤9 h (p < 0.001) on multivariate analysis. Factors associated with TPT greater than 9 h include history of head and neck radiation (p = 0.003), bony reconstruction (p = 0.05), stage IVa (p = 0.009), and stage IVb cancer (p < 0.001).

Conclusions

Implementation of the multidisciplinary conference in head and neck surgery was associated with reduced TPT and reduced OR return. Our study suggests preoperative planning conferences may improve surgical efficiency and outcomes in head and neck oncologic resections with microvascular free flap reconstruction.

Level of Evidence

3 Laryngoscope, 135:110-117, 2025

• Book : 135(1)
• Pub. Date : 2025
• Page : pp.110-117
• Keyword :