Saeid Ahmadi
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View article: Optimizing Microperforated Panel Sound Absorbers Using Response Surface Methodology: Measurement, Modeling, and Performance Evaluation
Optimizing Microperforated Panel Sound Absorbers Using Response Surface Methodology: Measurement, Modeling, and Performance Evaluation Open
Introduction: Microperforated panels (MPPs), often considered as potential replacements for fiber absorbers, have a significant limitation in their absorption bandwidth, particularly around the natural frequency. This study aims to address…
View article: Investigating the Acoustic Behavior of Polyurethane Foam Reinforced with Clay Nanoparticles
Investigating the Acoustic Behavior of Polyurethane Foam Reinforced with Clay Nanoparticles Open
Introduction: Disturbing noise can cause physical and mental illnesses among workers; for this reason, it is necessary to restrain it, especially in workplaces. Using sound-absorbing materials with suitable acoustic properties has been a g…
View article: Compressor pulsation noise attenuation using reactive silencer with various configurations: A theoretical and experimental study
Compressor pulsation noise attenuation using reactive silencer with various configurations: A theoretical and experimental study Open
Compressors are a significant source of noise in various industries. Silencers can be utilized to mitigate this noise. This study aims to design and construct an expansion silencer that can effectively reduce the pulsating noise produced b…
View article: An Enhanced Model Predictive Capacitor Voltage Control of Hybrid Modular Multilevel Converters Under Overmodulation Circumstances
An Enhanced Model Predictive Capacitor Voltage Control of Hybrid Modular Multilevel Converters Under Overmodulation Circumstances Open
Modular multilevel converters (MMCs) require well-balanced submodule (SM) capacitor voltages at the reference value for satisfactory steady-state and dynamic operations. Achieving this goal in hybrid MMCs, where the modulation index exceed…
View article: Study of acoustic and aerodynamic performance of reactive silencer with different configurations: Theoretical, modeling and experimental
Study of acoustic and aerodynamic performance of reactive silencer with different configurations: Theoretical, modeling and experimental Open
Periodic sound reduction at some frequencies and high pressure loss could be considered as the disadvantages of simple expansion silencers. Generally, reactive elements are applied in silencers to optimize their acoustic and aerodynamic pe…
View article: Redesign and Fabrication of a Folding Ergonomic Laptop Desk for College Students
Redesign and Fabrication of a Folding Ergonomic Laptop Desk for College Students Open
Background: Awkward posture during work is one of the most critical risk factors for musculoskeletal disorders. A laptop desk fitting with users’ body dimensions plays a crucial role in maintaining proper posture and reducing musculoskelet…
View article: Punch press noise control through partial acoustic enclosure: A Field Study
Punch press noise control through partial acoustic enclosure: A Field Study Open
Background and aims: Punch press is contributed as one of the major industrial machines to produce metal objects, which typically propagates hazardous noise.Acoustic enclosure is the most common method to mitigate noise transmitted from in…
View article: Studi Sanitasi RSU “ Dr. Koesnadi ” Kabupaten Bondowoso
Studi Sanitasi RSU “ Dr. Koesnadi ” Kabupaten Bondowoso Open
The quality of the Hospital Environment (RS) that is good in terms of physical, biological, chemical, and social will make it a place of health services that can guarantee the maintenance and improvement of the health status of the communi…
View article: Reducing Occupational Noise Propagated from Centrifugal Fan through Dissipative Silencers: A Field Study
Reducing Occupational Noise Propagated from Centrifugal Fan through Dissipative Silencers: A Field Study Open
Acoustic performance of dissipative silencer was evaluated to determine the effectiveness of perforated duct porosity and absorbent material density in reducing occupational noise exposure propagated from centrifugal fan. Design charts wer…
View article: Effect of Surface Shape on Perforated Acoustic Absorber Performance Using Numerical and Experimental Methods
Effect of Surface Shape on Perforated Acoustic Absorber Performance Using Numerical and Experimental Methods Open
Effect of Surface Shape on Perforated Acoustic Absorber Performance Using Numerical and Experimental Methods
View article: Dynamic robust generation–transmission expansion planning in the presence of wind farms under long‐ and short‐term uncertainties
Dynamic robust generation–transmission expansion planning in the presence of wind farms under long‐ and short‐term uncertainties Open
The main goal of generation expansion planning (GEP) and transmission expansion planning (TEP) is to expand the power system to satisfy the increasing demand of electricity while maintaining efficient operation of the system. The major obj…
View article: The Acoustic Performance of 3D Printed Multiple Jet Nozzles with Different Configurations
The Acoustic Performance of 3D Printed Multiple Jet Nozzles with Different Configurations Open
This work investigated multiple jet nozzles with various geometrical shape, number of exits, and material on reducing noise radiated from jet flows. Nozzles are categorized in two groups with few and many exit numbers, each with various ex…
View article: Risk of Cancer in Occupational Exposure to Radar Radiation: A Systematic Review
Risk of Cancer in Occupational Exposure to Radar Radiation: A Systematic Review Open
Background and aim: Microwave radiations are one of the most environmental workplace factors that exposed too many workers. In microwave spectrum, radar frequency with 1-300 GHz range have varied applications such as satellite, communicati…
View article: A Comparison of the Correlation Between ESI and Other Thermal Indices (WBGT, WBDT, TWL, HI, SET, PET, PSI, and PSIHR): A Field Study
A Comparison of the Correlation Between ESI and Other Thermal Indices (WBGT, WBDT, TWL, HI, SET, PET, PSI, and PSIHR): A Field Study Open
Background: Heat is one of the harmful physical factors in the workplace. Occupational heat stress refers to the net load that the workers should put up with as a result of the combined impact of metabolic heat, environmental factors, and …
View article: Association of Road Traffic Noise Exposure and Driving Behaviors
Association of Road Traffic Noise Exposure and Driving Behaviors Open
Background: The noise caused by traffic is an increasingly prominent feature of urban environments. However, limited studies have been focused on the assessment of exposure-response relationship between road traffic noise exposure and driv…
View article: Investigating noise pollution induced by diesel generators in building construction activities in one of the district of Tehran city
Investigating noise pollution induced by diesel generators in building construction activities in one of the district of Tehran city Open
Introduction: Using diesel generators is necessary for activities like welding in construction sites and it is often accompanied with noise pollution. The aim of this study was to evaluate noise pollution induced by diesel generators in co…
View article: Water pump noise control using designed acoustic curtains in a residential building of Qazvin city
Water pump noise control using designed acoustic curtains in a residential building of Qazvin city Open
Background and aims: Using water pump in residential buildings to provide the required water pressure is accompanied by noise pollution and the annoyance of residents. So, the purpose of this study is to reduce water pump noise pollution w…
View article: Comparing Universal Thermal Climate Index (UTCI) with selected thermal indices/environmental parameters during 12 months of the year
Comparing Universal Thermal Climate Index (UTCI) with selected thermal indices/environmental parameters during 12 months of the year Open
Heat stress negatively influences human health and performance, and leading to lower efficiency in daily activities. The present study sought to examine the relationship between UTCI, other heat indices (SET, PET, PMV, PPD, and WBGT), and …
View article: Air blow guns noise reduction through design and fabrication of a multiple jet nozzle
Air blow guns noise reduction through design and fabrication of a multiple jet nozzle Open
Background and aims: Discharging compressed air through conventional single jet nozzles or open pipes is a common jet noise in industry. This study is aimed to reduce air blow gun jet noise by designing and fabrication of multiple jet nozz…
View article: Hearing loss among Fasa sugar factory workers’, Fars Provincre, Iran (2016)
Hearing loss among Fasa sugar factory workers’, Fars Provincre, Iran (2016) Open
Background: Hearing loss induced by noise is one of the well-known and main health problems of occupational exposures.As a result, the current study sought to examine the association between age, working experience, and smoking status and …
View article: Upgrading fuzzy logic by GA-PS to determine asphaltene stability in crude oil
Upgrading fuzzy logic by GA-PS to determine asphaltene stability in crude oil Open
Precipitation and deposition of asphaltene are undesirable phenomena that arise during petroleum production which give rise to a pronounced rate of increase in operational cost and adversely affect production rates as well. Hence, it is im…
View article: Estimation of water saturation by using radial based function artificial neural network in carbonate reservoir: A case study in Sarvak formation
Estimation of water saturation by using radial based function artificial neural network in carbonate reservoir: A case study in Sarvak formation Open
Water saturation determination in core laboratory is known as a cost and time consuming labor. Hitherto, many scientists attempted to estimate accurately water saturation from well-logging data which has a continuous record without losing …
View article: The Effect of Oral L-Carnitine Supplementation on Lipid Profiles and Antioxidant Status in Hemodialysis Patients: A Randomized Clinical Trial
The Effect of Oral L-Carnitine Supplementation on Lipid Profiles and Antioxidant Status in Hemodialysis Patients: A Randomized Clinical Trial Open
Introduction: Dyslipidemia and oxidative stress are commonly seen in the patients undergoing hemodialysis. This study aimed to evaluate the effect of oral L-carnitine supplementation on lipid profiles and total antioxidant capacity of the …