نتایج جستجو برای: dual media filter

تعداد نتایج: 550868  

In this paper, a new voltage controlled first order all-pass filter is presented. The proposed circuit employs a single differential voltage dual-X second generation current conveyor (DV-DXCCII) and a grounded capacitor only. The proposed all-pass filter provides both inverting and non inverting voltage-mode outputs from the same configuration simultaneously without any matching condition. Non-...

Journal: :international journal of occupational hygiene 0
ehsan farvaresh department of occupational health engineering, school of public health,tehran university of medical sciences, tehran, iran. farideh golbabaei department of occupational health engineering, school of public health,tehran university of medical sciences, tehran, iran. mansour ghiyaseddin department of occupational health engineering, school of public health,tehran university of medical sciences, tehran, iran. ali behdashti managing director of imen sarv co. keramatollah nouri-jaliani department of epidemiology & biostatics, school of public health, tehran university of medical sciences, tehran, iran. mehrdad karimi department of epidemiology & biostatics, school of public health, tehran university of medical sciences, tehran, iran.

the aim of this study was to evaluate the effect of evaporative media as gas turbine intake air cooling method on pressure drop of cartridge air filters. this study performed under the laboratory condition, using stainless steel test rig with specified dimensions to investigate the role of evaporative media in air cooling as well as its effects on new and used cartridge filters (as representati...

A new multi-layer substrate integrated waveguide (SIW) structure is developed to design dual-band evanescent-mode band-pass filters (BPFs). Two independent series LC circuits are implemented by incorporating metallic irises in the different layers of the structure. The combination of the metallic irises with capacitive-plates is embedded inside the SIW to independently excite two evane...

ژورنال: طلوع بهداشت یزد 2016
ابراهیمی, افشین, خدا رحمی, مهرداد, رحمتی, عزت اله, عبداله نژاد, علی, مهدوی, مختار,

Introduction: Heavy metals owing to their health hazards and high toxicity in low concentration for human and environment have very concern and attention. Slow sand filter is one of the simple and cost-effective for removal of these pollutants. In this method, media play an important role for removal of pollutant. Therefore, the aim of this study was investigation of different media like slag, ...

Journal: :Math. Comput. 2015
Bin Han

Dual wavelet frames and their associated dual framelet filter banks are often constructed using the oblique extension principle. In comparison with the construction of tight wavelet frames and tight framelet filter banks, it is indeed quite easy to obtain some particular examples of dual framelet filter banks with or without symmetry from any given pair of low-pass filters. However, such constr...

A. Frotanpour G. Dadashzadeh M. Okhovvat R. Keneshloo

Multipactor breakdown analysis is presented in cylindrical dielectric resonator waveguide filter under its dual-mode behavior. The method of effective electron algorithm with combination of Monte-Carlo method is used to perform the simulation and predict multipactor breakdown thresholds. The breakdown thresholds of the proposed structure are presented for different values of frequency-gap produ...

Journal: :Journal of Industrial & Engineering Chemistry 1921

2013
Kenneth S. K. Yeo Augustine O. Nwajana

Dual-mode square patch resonator is well known in the design of a single band quasi-elliptic bandpass filter response. Here, the dual-mode square patch resonator is employed to achieve a dualband bandpass filter. A 6 pole dual-band bandpass filter response with 3 poles at each passband will be presented. The dual-band filter also exhibits a transmission zero between the two passbands. A detaile...

ژورنال: سلامت کار ایران 2013
باکند, شهناز, رضایی فرد, بهزاد, صدیق زاده, اصغر, صلحی, مهناز, فرشاد, علی اصغر , مرادی, غلامرضا, موسوی, سعید, یاراحمدی, رسول ,

  Background and aims : With the increasing application of nanotechnology concerns about the negative effects of human exposure and environmental releases of these particles is also doubled. Among the most well-known media, ULPA filters are used to control nanoparticles. In this study, the efficiency and pressure drop of ULPA fiber bed for collection and removal of nanoparticles were investigat...

ژورنال: سلامت و محیط زیست 2021

Background and Objective: Access to safe water is critical for protecting human health. Turbidity is one of the main physical parameters that affect the quality of water from both health and aesthetical points of view. Therefore, waters should be treated based on the standards set for turbidity before consumption. This study was performed to determine the performance of a bench-scale baffled fi...

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