Abstract: The purpose of this study is to determine the effects of evaporation and condensation on the underfloor space of Japanese detached houses. In this underfloor space, natural ventilation is applied. A typical Japanese wooden detached house is raised 0.3–0.5 m over an underfloor space made of concrete. The bottom of the underfloor space is usually paved with concrete, and the ceiling whi...

The dual-airflow window could be used to conserve energy and improve indoor air quality in buildings because it works like a heat exchanger and can introduce outdoor air into buildings. In order to optimize the window design, this investigation used the orthogonal method to evaluate the importance of these 13 design parameters of the dual airflow window in energy conservation: outdoor air suppl...

The supply air from the airliner ventilation system is a mixture of outside air and recirculated air that passes through a high efficiency particulate air (HEPA) filter. The effectiveness of two commercial-available airliner cabin air filters were investigated under the laboratory-based measurement due to the practical restriction of airliner cabin filter test during usage. The filtration effic...

Human sniffing behavior usually involves bouts of short, high flow rate inhalation (>300 ml/s through each nostril) with mostly turbulent airflow. This has often been characterized as a factor enabling higher amounts of odorant to deposit onto olfactory mucosa than for laminar airflow and thereby aid in olfactory detection. Using computational fluid dynamics human nasal cavity models, however, ...

BACKGROUND The impact of respiratory dynamics on odor response has been poorly studied at the olfactory bulb level. However, it has been shown that sniffing in the behaving rodent is highly dynamic and varies both in frequency and flow rate. Bulbar odor response could vary with these sniffing parameter variations. Consequently, it is necessary to understand how nasal airflow can modify and shap...

The present investigation was carried out to study the effect of PHE in experimental induced bronchial asthma in mice. Trypsin and egg-albumin induced chronic model of asthma was used and various parameters were measured on 35 day. The asthmatic control group showed lower level of pO2, tidal volume, airflow rate and higher respiratory rate, serum bicarbonate level, eosinophil count in bronchoal...

OBJECTIVES/HYPOTHESIS To determine the effect of topical intranasal oxymetazoline on nasal resistance and aerobic exercise performance in patients with nasal congestion caused by inferior turbinate hypertrophy. STUDY DESIGN Individual randomized controlled trial. METHODS Eight patients with inferior turbinate hypertrophy performed a set of exercise tests to exhaustion 1 week apart. They wer...

OBJECTIVES The purpose of this study was to determine the aerodynamic and acoustic features of speech produced at comfortable, maximal and minimal levels of vocal effort. STUDY DESIGN Prospective, quasi-experimental research design. METHOD Eighteen healthy participants with normal voice were included in this study. After task training, participants produced repeated syllable combinations at...

Buoyancy-driven natural ventilation in ventilation shafts is investigated with a small scale physical experiment within a duct and CFD simulations of an office building. For a fixed exhaust opening, smaller shafts lead to higher flow rates in upper floors of a multi-story building with a shared ventilation shaft. These higher flow rates are caused by increased vertical momentum within the small...

11 Currently there exists no generally accepted reference technique to measure the ventilation rate 12 through naturally ventilated (NV) vents. This has an impact on the reliability of airflow rate control 13 techniques and emission rate measurements in NV animal houses. As an attempt to address this issue a 14 NV test facility was built to develop new airflow rate measurement techniques for bo...