New studies show that the elastic properties of the vocal folds (VFs) vary locally. In particular strong gradients exist in the distribution of elastic modulus along the length of the VF ligament, which is an important load-bearing constituent of the VF tissue. There is further evidence that changes in VF health are associated with alterations in modulus gradients. The role of VF modulus gradat...

Optimal control of enclosed environment requires detailed information of air distribution that could be obtained by numerically solving Navier-Stokes equations with a suitable turbulence model. This investigation evaluated the performance of eight turbulence models for transient airflow in enclosed environment using experimental data obtained in a room. The study used the room to create three c...

The aim of the present study was to measure age-specific prevalence of airflow obstruction in Switzerland in smokers and never-smokers using pulmonary function tests and respiratory symptoms from 6,126 subjects participating in the Swiss Cohort Study on Air Pollution and Lung Diseases in Adults. The lower limit of normal of the forced expiratory volume in 1 s/forced vital capacity ratio was use...

Combined with the structure of solar greenhouse, this paper proposed a new type greenhouse heating and ventilation system framework as carrier ventilation. The system’s return air mode, tuyere type, installation position aperture ratio were determined by computational fluid dynamics (CFD). results showed that: 1) When inlet wind speed was 10m/s temperature 37°C, using upper method, average crop...

Abstract Computational fluid dynamics analysis of a building plan has been investigated with predominant wind velocity for different directions. The flow properties’ variation in the computational domain modeled by solving Reynolds-Averaged Navier–Stokes (RANS) equations finite volume second-order discretization scheme. turbulence airflow distribution and around Shear Stress Transport (SST) k–ω...

The downwash airflow field of UAVs is insufficient under the dual influence greenhouse structure and crop occlusion, distribution characteristics flight flow in greenhouses are unclear. In order to promote application greenhouses, a were studied herein. containing tomato plants, porous media model was used simulate obstacle effect crops on airflow. multi-reference system method selected solve U...

OBJECTIVE To highlight the importance of the lung ventilation scintigraphy (LVS) to study the regional distribution of lung ventilation and to describe most frequent abnormal patterns of lung ventilation distribution obtained by this technique in COPD and to compare the information obtained by LVS with the that obtained by traditional lung function tests. MATERIAL AND METHODS The research was...

The working parameters of the pneumatic sprayer, such as sprayer's attitude, airflow, and spraying amount, have an impact on evenness seed distribution during process vegetation restoration degraded grasslands . This article focuses 4BQD-40C sprayer analyzes forward speed, airflow velocity at inlet, frequency swinging nozzle quality. conclusion shows that: 1) equation trajectory was obtained, l...

Airflow through the upper airways is a basic ingredient for human speech production. In real life, the airflow is subjected to complex initial and boundary conditions defined by upper airway geometry, tissue properties and airflow. In order to increase understanding, the current paper considers airflow through simplified geometries derived from ‘in-vivo’ rigid and steady upper airway configurat...

Optimizing the refrigerant circuitry for a finned-tube evaporator is a daunting task for traditional exhaustive search techniques due to the extremely large number of circuitry possibilities. For this reason, more intelligent search techniques are needed. This paper presents and evaluates a novel optimization system, called ISHED1 (Intelligent System for Heat Exchanger Design). This system uses...