This study reports a new integrated device for measuring oral and nasal airflow with lossless speech recording with preliminary results on Chinese plosives. An acoustically transparent fiber-made mask acts both as a material for airflow resistance and a support for partitioning oral and nasal chambers. Two pressure sensors placed directly on the mask measure air pressure signals that correspond...

background: volatile organic compounds (vocs) are among the main air pollutants which have destructive effects on the environment and human health. considering the carcinogenic effects of some of these compounds including benzene, how to control and limit them is considered an important issue in environmental research. the aim of this study was to evaluate the use of the combined ultraviolet (u...

Rationale: Overproduction of mucus is a contributory factor in the progression of COPD. The polymeric mucins are major macromolecules in the secretion. Therefore, we hypothesized that the polymeric mucin composition or properties may be different in the sputum from individuals with COPD and smokers without airflow obstruction. Objectives: To determine the major polymeric mucins in COPD sputum a...

Composting experiments with heat recovery reveal spatial non-uniformity in parameters such as temperature, oxygen concentration and substrate degradation. In order to recover from static compost piles via integrated exchanger there is the need investigate temperature distribution for placing exchangers interaction between recovery, degradation ensure quality of composting process. This study in...

The purpose of this paper is to apply MEMS techniques to manufacture a gas flow sensor that consists with an airflow rate and airflow direction sensing units for detection of airflow states. This study uses a silicon wafer as a substrate which is deposited silicon nitride layers. To form the airflow rate sensing unit, a micro heater and a sensing resistor are manufactured over a membrane that r...

THE ASSOCIATION BETWEEN OBSTRUCTIVE SLEEP APNEA SYNDROME (OSAS), MAXILLOFACIAL MALFORMATIONS, AND MALOCCLUSIONS HAS ATTRACTED ATTENTION. Many patients with OSAS show craniofacial abnormalities involving both the jaws as well as skeletal structures of the respiratory dynamic space. These aberrations may be apparent very early in life. Nasal septal deviation is known to reduce airflow and increas...

Abstract The paper is dedicated to the experimental studies and numerical modeling of airflow in a 3D cylindrical bifurcation. computations are performed with standard k – ε turbulence model implemented ANSYS Fluid Flow (Fluent) code Workbench 2021R1. direct visualizations results corroborated, aim investigate evolution vortical structures distribution flow rate

Understanding the properties of airflow in the nasal cavity is essential to understanding physiologic and pathologic aspects of nasal breathing. Many attempts have been made to evaluate nasal airflow patterns using the best possible analytical methods available at the time. Recently, digital particle image velocimetry (DPIV) and computational fluid dynamic methods have been applied to this area...

Cilia of olfactory sensory neurons are the primary sensory organelles for olfaction. The detection of odorants by the main olfactory epithelium (MOE) depends on coupling of odorant receptors to the type 3 adenylyl cyclase (AC3) in olfactory cilia. We monitored the effect of airflow on electro-olfactogram (EOG) responses and found that the MOE of mice can sense mechanical forces generated by air...

OBJECTIVES To describe a multidimensional symptom profile in patients with stable chronic obstructive pulmonary disease (COPD) and determine whether symptom experience differed between patients with moderate or severe airflow limitations. BACKGROUND Patients with severe airflow limitation experience numerous symptoms, but little is known regarding patients with moderate airflow limitation. ...