scholarly journals Influence of High‐Efficiency Particulate Air Filtration on Mortality and Fungal Infection: A Rebuttal

2006 ◽  
Vol 194 (11) ◽  
pp. 1621-1622 ◽  
Author(s):  
Gerald Paul Bodey ◽  
Emil J. Freireich
Keyword(s):  
Fungal Infection ◽  
High Efficiency ◽  
Air Filtration

scholarly journals Awareness of aerosol-related transmission of COVID-19 among the dentists of Nepal

BDJ Open ◽  
2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Nashib Pandey ◽  
Buddha Bahadur Basnet ◽  
Sushmit Koju ◽  
Anju Khapung ◽  
Alka Gupta
Keyword(s):  
Social Sciences ◽  
Particle Size ◽  
High Efficiency ◽  
Emergency Services ◽  
Uv Light ◽  
Ventilation System ◽  
Age Groups ◽  
Air Filtration ◽  
Online Questionnaire ◽  
Dental Practitioners

Abstract Objective To access the awareness of dental practitioners of Nepal towards COVID-19 transmission through aerosols. Materials and methods The study involved 384 dentists from all over Nepal and was conducted for a period of 3 months. A self-reported online questionnaire was developed using Google forms and the link was shared. It emphasized the awareness related to the aerosol and ventilation system in their daily practices was prepared. The data were analyzed in Statistical Package for Social Sciences version 20.0 software. Results The majority of participants were female 52.9% (n = 203) and within the age groups of <30 years 57% (n = 219). Participants from Bagmati Province were 60.4% (n = 232), with least from Sudurpaschim Province 0.5% (n = 2). 60% of participants provided only emergency services during the COVID-19 pandemic and few (7%) provided consultations via telephone. The current ventilation system used was a well-ventilated room with open windows 65.4% (n = 251). However, 52.8% (n = 203) preferred specialized operatory incorporating high-efficiency particulate air (HEPA) filters and ultraviolet (UV) light. More than 60% of respondents were unaware of the particle size of the aerosol. Conclusions The obtained results signify the need for the proper ventilation system with appropriate air filtration systems in dental clinical setups.

Three-dimensional composite electrospun nanofibrous membrane by multi-jet electrospinning with sheath gas for high-efficiency antibiosis air filtration

2021 ◽  
Vol 32 (24) ◽  
pp. 245707
Author(s):  
Jiaxin Jiang ◽  
Zungui Shao ◽  
Xiang Wang ◽  
Ping Zhu ◽  
Shiqing Deng ◽  
...  
Keyword(s):  
High Efficiency ◽  
Three Dimensional ◽  
Nanofibrous Membrane ◽  
Air Filtration

High efficiency air filtration: The growing impact of membranes

2009 ◽  
Vol 46 (4) ◽  
pp. 22-25 ◽  
Author(s):  
Ned Galka ◽  
Abhishek Saxena
Keyword(s):  
High Efficiency ◽  
Air Filtration

Soy protein isolate/bacterial cellulose composite membranes for high efficiency particulate air filtration

2017 ◽  
Vol 138 ◽  
pp. 124-133 ◽  
Author(s):  
Xiaobing Liu ◽  
Hamid Souzandeh ◽  
Yudong Zheng ◽  
Yajie Xie ◽  
Wei-Hong Zhong ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Soy Protein ◽  
High Efficiency ◽  
Soy Protein Isolate ◽  
Composite Membranes ◽  
Protein Isolate ◽  
Air Filtration ◽  
Cellulose Composite

Evaluation of Air Filtration Options for an Industrial Gas Turbine

2015 ◽  
Author(s):  
Christopher A. Perullo ◽  
Josh Barron ◽  
Dale Grace ◽  
Leonard Angello ◽  
Tim Lieuwen
Keyword(s):  
Pressure Drop ◽  
Gas Turbines ◽  
Life Cycle Cost ◽  
High Efficiency ◽  
Air Filtration ◽  
Unit Output ◽  
Almost All ◽  
The Cost ◽  
The Impact ◽  
Unit Performance

Gas turbines ingest large quantities of air during operation. As a result, large quantities of foreign particles ranging in size from smoke (0.01 to 1.0 micron) to pollen (10 micron) enter the unit and can contribute to both fouling and erosion depending on particle size. Fouling and erosion both lead to reductions in unit output and efficiency resulting in increased operational cost. Operators have historically combatted fouling through a combination of online water washes, more effective off-line water washes, and air filtration. As is the case with almost all engineering problems, the trade-off between the cost and effectiveness of these methods must be evaluated. Online washing is somewhat effective but has led to first stage blade erosion and unit trips in some cases. Off-line washing is more effective at cleaning the unit, but requires the unit to be shut down for extended periods of time. Air filtration can help prevent foreign particles from entering the unit, but higher efficiency filters are generally associated with a larger inlet pressure drop, leading to decreased unit output; this is balanced against reduced fouling rates. These tradeoffs between the costs associated with higher efficiency filters and the frequency of compressor washing need to be evaluated on a plant-by-plant basis to determine the best combination of air filtration and compressor washing programs. This paper presents a field study carried out to determine the effectiveness of high efficiency filters in preventing compressor fouling. Fourteen units at four sites were monitored over a 9 month to 3 year time period to determine the changes in unit performance and the impact of water washes on unit performance for both pre and final filters of lower and higher efficiency ratings. Results to date indicate that higher efficiency filters are effective at reducing the need for off-line water washes and potentially reduce life-cycle cost. Reduced output from the higher pressure drop, high efficiency filters is offset by the better performance retention offered from reduced fouling rates.

scholarly journals Public health and bioterrorism: renewed threat of anthrax and smallpox

Medicina ◽  
2007 ◽  
Vol 43 (4) ◽  
pp. 278 ◽  
Author(s):  
Arūnė Wallin ◽  
Živilė Lukšienė ◽  
Kęstutis Žagminas ◽  
Genė Šurkienė
Keyword(s):  
Public Health ◽  
High Efficiency ◽  
Biological Weapons ◽  
Air Filtration ◽  
Animal Products ◽  
The Public ◽  
Emergency Response System ◽  
Anthrax Infection ◽  
The Government ◽  
Droplet Nuclei

Bioterrorism is one of the main public health categorical domains. According to sociological analytics, in postmodern society terrorism is one of the real threats of the 21st century. While rare, the use of biological weapons has a long history. Recently, anthrax has been evaluated as one of the most dangerous biological weapons. Naturally occurring anthrax in humans is a disease acquired from contact with anthrax-infected animals or anthrax-contaminated animal products. Usually anthrax infection occurs in humans by three major routes: inhalational, cutaneous, and gastrointestinal. Inhalational anthrax is expected to account for most serious morbidity and most mortality. The clinical presentation of inhalation anthrax has been described as a two-stage illness. Many factors contribute to the pathogenesis of Bacillus anthracis. Antibiotics, anthrax globulin, corticosteroids, mechanical ventilation, vaccine are possible tools of therapy. Smallpox existed in two forms: variola major, which accounted for most morbidity and mortality, and a milder form, variola minor. Smallpox spreads from person to person primarily by droplet nuclei or aerosols expelled from the oropharynx of infected persons and by direct contact. In the event of limited outbreak with few cases, patients should be admitted to the hospital and confined to rooms that are under negative pressure and equipped with high-efficiency particulate air filtration. In larger outbreaks, home isolation and care should be the objective for most patients. Progress in detection, suitable vaccines, postexposure prophylaxis, infection control, and decontamination might be serious tools in fight against the most powerful biological weapon. To assure that the public health and healthcare system can respond to emergencies, the government should direct resources to strengthen the emergency-response system, create medication stockpiles, and improve the public health infrastructure.

scholarly journals Awareness of Aerosol related transmission of COVID-19 among the Dentists of Nepal

2021 ◽  
Author(s):  
Nashib Pandey ◽  
Buddha Basnet ◽  
Sushmit Koju ◽  
Anju Khapung ◽  
Alka Gupta
Keyword(s):  
Social Sciences ◽  
Particle Size ◽  
High Efficiency ◽  
Emergency Services ◽  
Uv Light ◽  
Ventilation System ◽  
Age Groups ◽  
Air Filtration ◽  
Online Questionnaire ◽  
Dental Practitioners

Abstract Objective: To access the awareness of dental practitioners of Nepal towards COVID-19 transmission through aerosols.Materials and Methods: The study involved 384 dentists from all over Nepal and was conducted for a period of three months. A self-reported online questionnaire was developed using Google forms and the link was shared. It emphasized the awareness related to the aerosol and ventilation system in their daily practices was prepared. The data were analysed in Statistical Package for Social Sciences version 20.0 software. Results: Majority of participants were female 52.9% (n = 203) and within the age groups of <30 years 57% (n = 219). Participants from Bagmati Province were 60.4% (n = 232), with least from Sudurpaschim Province 0.5% (n = 2). 60% of participants provided only emergency services during the COVID-19 pandemic and few (7%) provided consultations via telephone. The current ventilation system used was a well-ventilated room with open windows 65.4% (n = 251). However, 52.8% (n = 203) preferred specialized operatory incorporating high efficiency particulate air (HEPA) filters and ultraviolet (UV) light. More than 60% of respondents were unaware of the particle size of the aerosol.Conclusions: The obtained results signify the need for the proper ventilation system with appropriate air filtration systems in dental clinical setups.

scholarly journals Introducing a Newly Developed Fabric for Air Filtration

2020 ◽  
Vol 20 (2) ◽  
pp. 148-154
Author(s):  
Mohamed Hakam ◽  
Wael Hashima ◽  
Ibrahim Elhawary ◽  
Adel Elgeiheini
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Operating Conditions ◽  
Woven Fabric ◽  
Optimum Operating ◽  
Air Filtration ◽  
Pore Characteristics ◽  
Nonwoven Fabrics ◽  
Filter Size ◽  
Filtration Area

AbstractWoven and nonwoven fabrics present filtration efficiency higher than other air filtration media. Fabrics are selected according to air flow conditions and particle characteristics. The majority of air filtration media are nonwoven fabrics because of their cost, but they need high filtration area for high efficiency. Modified construction of woven fabric introduces high performance in air filtration and decreases filter size, which tends to have better competition abilities. The designed fabrics have considerable thickness and suitable pore characteristics by applying roving instead of weft yarns. Four factors (roving count and their turns per inch, picks per inch and fabric designs) were varied in order to study the effect of these factors on their performance in filtration. Optimum operating conditions for a determined range of air permeability and pore size were obtained.

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