Various infectious agents are known to be transmitted naturally via respiratory aerosols produced by infected patients. Such aerosols may be produced during normal activities by breathing, talking, coughing and sneezing. The schlieren optical method, previously applied mostly in engineering and physics, can be effectively used here to visualize airflows around human subjects in such indoor situ...

Cough-related variables such as cough frequency, time to onset (i.e. the time until the first cough occurs) and the cough index (i.e. the ratio between the cough frequency and the time to onset) may be important when interpreting results of cough challenges for therapeutic interventions or for comparative research purposes. Nevertheless, repeatability (or reproducibility) for these widely used ...

Cough airflow dynamics have been previously studied using a variety of experimental methods. In this study, real-time, non-invasive shadowgraph imaging was applied to obtain additional analyses of cough airflows produced by healthy volunteers. Twenty healthy volunteers (10 women, mean age 32.2±12.9 years; 10 men, mean age 25.3±2.5 years) were asked to cough freely, then into their sleeves (as p...

qajar period is recognized as a time of significant changes in persian arts. perhaps the most obvious change was the influence of european arts especially on architecture, painting as well as pottery. however after safavid period as to several inside and outside factors, amongst them vast importation of porcelain wares, iran was faced with stagnation of pottery’s art but this doesn’t mean the a...

inter organizational collaboration has been considered as a novel concepts in supply chain management by many researchers. in this paper two groups of internal and external factors were examined in relationship with inter-organizational collaboration in iran khodro supply chain. internal factors consist of organizational strategy and technology and inter-organizational factors refers to trust a...

introduction: implementation of training programs can help an organization to supply the required specialist manpower and to solve personnel productivity problems. therefore, the implementation of training programs will increase the effectiveness and productivity of personnel services in an organization. to better implement and improve the quality of training programs some necessary conditions ...