The measurement of natural airflows is challenging, because low pressures involved in ventilation, and their variability. tracer gas decay method the most used to assess airflows. It is, however, not adapted multi-zone dwellings. A protocol based on tested here involving Kalman filter, a correction procedure concentrations. Both intend allow global airflow-rate passive-stack ventilated dwelling...

RATIONALE Most patients who develop persistent airflow limitation do so either as a manifestation of chronic obstructive pulmonary disease that is largely related to smoking or as a consequence of persistent asthma. We sought to compare the natural course of lung function associated with persistent airflow limitation in subjects with and without asthma from early to late adult life. METHODS W...

The aim of this study was to test the hypothesis that carbon monoxide diffusing capacity (DCO) is elevated in asthmatic patients with minimal airflow limitation and/or hyperinflation; the latter factors should reduce the possibility of technical errors in the measurement of DCO. In ten asthmatic and ten healthy subjects, DCO and its components, membrane diffusing capacity (Dm) and pulmonary cap...

The computational fluid dynamics (CFD) are used to evaluate the physiological function of the nose. We evaluated the aerodynamics of the nasal cavity in a patient with septal perforation (SP), pre- and postvirtual repair. Three-dimensional nasal models were reconstructed, and then a wide range of the pressure drops and flow rates were analyzed. The airflow velocity is higher in the central regi...

In this study, we perform a numerical analysis of the instability ligament in shear flow and investigate effects air-liquid on growth rate interface, breakup time, droplet diameter formed by breakup. The is stretched direction shearing airflow. Furthermore, as influence increases, becomes deformed into liquid sheet, perforation forms at center sheet. sheet breaks up due to contracts under surfa...

The purpose of this paper is to provide a new method for solving the problem 3D source localization in indoor environments with weak airflow by experimental study on multi-robot method. For purpose, we developed MRO (mobile robot olfaction) system consisting three mobile robots. gas sensor carried each has moving range 0.5 m 1.5 Z-axis. A total 60 experiments were conducted validate and compare...

Background The aim of this study was to estimate the occupational burden of airflow limitation, chronic airflow limitation, COPD, and emphysema. Materials and methods Subjects aged 50-64 years (n=1,050) were investigated with forced expiratory volume in 1 s (FEV1) and forced vital capacity (FVC). Airflow limitation was defined as FEV1/FVC <0.7 before bronchodilation. Chronic airflow limitatio...

The surface area of the maxilloturbinals and fronto-ethmoturbinals is commonly used as an osteological proxy for the respiratory and the olfactory epithelium, respectively. However, this assumption does not fully account for animals with short snouts in which these two turbinal structures significantly overlap, potentially placing fronto-ethmoturbinals in the path of respiratory airflow. In the...