نتایج جستجو برای: masks
تعداد نتایج: 9474 فیلتر نتایج به سال:
bioaerosols are the most significant risk for exposed people leads to infectious diseases. this study was aimed at evaluation of physical and microscopic characteristics and submicron particulate filtration efficiency of surgical masks used in hospitals throughout iran. five types of domestic (zist filter, elhamteb and arman masks) and imported (blosom, face masks) surgical masks were tested se...
Background and Aim: Bioaerosols are one of the most important agents that cause post operating infections in hospitals. Surgical masks are recommended for prevention of bioaerosols transmition in operating rooms. This study aimed at evaluation of submicron particle filtration efficiency of domestic and imported surgical masks. Materials and Methods: In this cross sectional study, 5 types of...
Background and aims: Coronaviruses are important pathogens in humans and animals. In late 2019, a new coronavirus was identified as the cause of a group of pneumonia cases in Wuhan, Hubei Province, China. The disease spread rapidly, resulting in epidemics in China and reports of sporadic cases worldwide. In February 2020, the World Health Organization (WHO) identified COVID-19, which stands for...
Background and aim:This study was conducted with the aim of determining the effect of different disinfection methods on the efficiency,pressure drop and quality of medical masks used by medical staff. Also,the filtration efficiency of medical masks was investigated in the present study Materials and methods:In the present study, 4 models of medical masks used by the treatment staff were sele...
OBJECTIVE The aim of this study was to compare the efficacy of cloth masks to medical masks in hospital healthcare workers (HCWs). The null hypothesis is that there is no difference between medical masks and cloth masks. SETTING 14 secondary-level/tertiary-level hospitals in Hanoi, Vietnam. PARTICIPANTS 1607 hospital HCWs aged ≥18 years working full-time in selected high-risk wards. INTER...
We report a brain imaging study with fMRI in which participants were scanned while watching Noh masks with face expressions rated as happy. Among seventy standard masks previously rated by the participants, we selected the six happiest masks and six neutral masks to explore the neural correlates of happiness associated with Noh masks. Results based on region of interest (ROI) analysis indicated...
BACKGROUND Protective respiratory face masks protect the nose and mouth of the wearer from vapor drops carrying viruses or other infectious pathogens. However, incorrect use and disposal may actually increase the risk of pathogen transmission, rather than reduce it, especially when masks are used by non-professionals such as the lay public. Copper oxide displays potent antiviral properties. A p...
We provide a general notion of a Digital Derivative in 1−dimensional grids, which has real or integer-only versions. From any such masks, a family of masks called skipping masks are defined. We prove general results of multigrid convergence for skipping masks. We propose a few examples of digital derivative masks, including the now well-known binomial mask. The corresponding skipping masks auto...
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