نتایج جستجو برای: air filter testing unit

تعداد نتایج: 1019069  

A. A. Mirghasemi F. Eslamian M Heidarzadeh Seyed. Majdedin Mir Mohammad Hosseini

A sodium silicate-based chemical grout was used in the Karkheh dam site in order to examine the performance of the chemical grouting technique for stabilization of the dam's filter material. Karkheh, an embankment dam with the reservoir capacity of about 7.4 billion cubic meter at the maximum water level, is the largest dam in Iran. The grouting works performed at the dam site, were part of the...

Journal: :ACM Transactions on Software Engineering and Methodology 2021

Software changes constantly, because developers add new features or modifications. This directly affects the effectiveness of test suite associated with that software, especially when these modifications are in a specific area no case covers. article tackles problem generating high-quality to cover repeatedly given point program, ultimate goal exposing faults possibly affecting program point. B...

محمدیان, محمود ,

ABSTRACT Cotton dust is one of the chemical agents that cause air pollution in textile workshops. An investigation was done to measure cotton dust concentration in Mazandaran Province. 37 samples were collected by personal samplers devices and whatman filter papers of worker's inhalation zone of ambient air that contained total dust. 40 samples were collected by whatman filter papers and ho...

2016
Huan Ma Henggen Shen Tiantian Shui Qing Li Liuke Zhou Kim Natasha Dirks

Size- and time-dependent aerodynamic behaviors of indoor particles, including PM1.0, were evaluated in a school office in order to test the performance of air-cleaning devices using different filters. In-situ real-time measurements were taken using an optical particle counter. The filtration characteristics of filter media, including single-pass efficiency, volume and effectiveness, were evalua...

Journal: :مجله دانشگاه علوم پزشکی کرمانشاه 0
sayed bagher mortazavi associate professor in occupational health, tarbiat modarres university of medical sciences ramezan mirzae . director of hse in national petrochemical company ali khavanin assistant professor in occupational health, tarbiat modarres university of medical sciences hasan asilian assistant professor in occupational health, tarbiat modarres university of medical sciences mohsen nourshargh msc in occupational health, tarbiat modarres university of medical sciences. ardalan soleimani msc in occupational health, tarbiat modarres university of medical sciences.

introduction: chlorine gas producting by mercury cell (chlor-alkali) is one of the most widely used methods. leakage and vaporizing mercury from cells can cause occupational poisoning. mercury is the most toxic non-radioactive heavy metal ; therefore measurement of air concentration of this metal is very important. the aim of this research was measuring ambient air mercury concentration in a pe...

Farhang Dehghan, Somayeh , Golbabaei, Farideh , Mohammadi, Hamzeh , Sedigh Zadeh, Asghar ,

Introduction: Despite nanofibers have attracted great interests for filtering particulate matters from the air stream, fewer studies have been done on the feasibility of their use in the removal of gas pollutants, while the both pollutants are present in the most workplaces. Toluene is a toxic and mutagenic substance, and chronic exposure to its low levels can lead to a wide range of adverse he...

2007
Haibei Jiang Kaustubh Bhalerao Luis F. Rodríguez Scott Bell David Kortenkamp Alfred Soboyejo

High costs and extreme risks prevent the life testing of NASA hardware in relevant scenarios. These inherent limitations prevent the determination of sound reliability bounds for NASA hardware, thus it is unclear the true risk assumed in future missions. The simulation infrastructure for determining these risks is developed in a configurable format here. Preliminary results in preparation for v...

Journal: :journal of water sciences research 2013
j bazargan h.r eskandari

filter is one of the main components of embankment dams. by a simple but effective performance, filter protects the dam against erosion and soil scouring in impervious core caused by leakage (piping) and makes it safe. interaction between filter and erodible base soil is a complex phenomenon which is dependent upon several factors, and has challenged researchers for better understanding the fil...

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