Results 1 to 10 of about 9,306 (25)

The impact of nasal adhesions on airflow and mucosal cooling -- a computational fluid dynamics analysis [PDF]

Respiratory Physiology & Neurobiology Volume 293, November 2021, 103719, 2021
Nasal adhesions are a known postoperative complication following surgical procedures for nasal airway obstruction (NAO); and are a common cause of surgical failure, with patients often reporting significant NAO, despite relatively minor adhesion size.
arxiv   +1 more source

Pressure distribution and flow dynamics in a nasal airway using a scale resolving simulation [PDF]

Physics of Fluids 33, 011907 (2021);, 2021
Airflow through the nasal cavity exhibits a wide variety of fluid dynamicsbehaviour due to the intricacy of the nasal geometry. The flow is naturallyunsteady and perhaps turbulent, despite CFD in the literature that assumesa steady laminar flow. Time-dependent simulations can be used to generatedetailed data with the potential to uncover new flow ...
arxiv   +1 more source

Inhalation and deposition of spherical and pollen particles after middle turbinate resection in a human nasal cavity [PDF]

Respiratory Physiology & Neurobiology Volume 294, December 2021, 103769, 2021
Middle turbinate resection significantly alters the anatomy and redistributes the inhaled air. The superior half of the main nasal cavity is opened up, increasing accessibility to the region. This is expected to increase inhalation dosimetry to the region during exposure to airborne particles.
arxiv   +1 more source

Nasal Patches and Curves for Expression-robust 3D Face Recognition [PDF]

IEEE Transactions on Pattern Analysis and Machine Intelligence (PAMI), vol. 39, no. 5, pp. 995-1007, 2017, 2019
The potential of the nasal region for expression robust 3D face recognition is thoroughly investigated by a novel five-step algorithm. First, the nose tip location is coarsely detected and the face is segmented, aligned and the nasal region cropped. Then, a very accurate and consistent nasal landmarking algorithm detects seven keypoints on the nasal ...
arxiv   +1 more source

SARS-CoV-2 Entry Genes Are Most Highly Expressed in Nasal Goblet and Ciliated Cells within Human Airways [PDF]

Nature Medicine, 2020, 2020
The SARS-CoV-2 coronavirus, the etiologic agent responsible for COVID-19 coronavirus disease, is a global threat. To better understand viral tropism, we assessed the RNA expression of the coronavirus receptor, ACE2, as well as the viral S protein priming protease TMPRSS2 thought to govern viral entry in single-cell RNA-sequencing (scRNA-seq) datasets ...
arxiv   +1 more source

Primary spray break-up from a nasal spray atomizer using Volume of Fluid to Discrete Phase Model [PDF]

, 2023
Spray atomization process involves complex multi-phase phenomena. Abundant literature and validation of spray modelling for industrial applications like fuel injection in internal combustion and turbine jet engines are available. However, only a handful of studies, primarily limited to discrete phase modelling, of low-pressure applications, such as ...
arxiv   +1 more source

Speaker-independent Speech Inversion for Estimation of Nasalance [PDF]

arXiv, 2023
The velopharyngeal (VP) valve regulates the opening between the nasal and oral cavities. This valve opens and closes through a coordinated motion of the velum and pharyngeal walls. Nasalance is an objective measure derived from the oral and nasal acoustic signals that correlate with nasality.
arxiv  

Spray characteristics from nasal spray atomization [PDF]

arXiv, 2022
In addition to topical delivery, nasal sprays offer an alternative drug administration route to the systemic circulation, therefore avoiding the need for painful, invasive delivery techniques. Studies on the efficacy of nasal drug delivery to date have been conflicting despite its potential. In particular computational studies, e.g. Computational Fluid
arxiv  

Measuring Cognitive Load of Software Developers Based on Nasal Skin Temperature [PDF]

arXiv, 2022
It has recently become increasingly important to measure the cognitive load of developers. This is because continuing with a development under a high cognitive load may cause human errors. Therefore, to automatically measure the cognitive load, existing studies have used biometric measures such as brain waves and the heart rate. However, developers are
arxiv  

Physical and geometric constraints explain the labyrinth-like shape of the nasal cavity [PDF]

, 2017
The nasal cavity is a vital component of the respiratory system that heats and humidifies inhaled air in all vertebrates. Despite this common function, the shapes of nasal cavities vary widely across animals. To understand this variability, we here connect nasal geometry to its function by theoretically studying the airflow and the associated scalar ...
arxiv   +1 more source