Bahram Taheri - Academia.edu (original) (raw)

Papers by Bahram Taheri

Biomedicine & Pharmacotherapy, 2022

Background The scientific researches on COVID-19 pandemic topics are headed to an explosion of sc... more Background The scientific researches on COVID-19 pandemic topics are headed to an explosion of scientific literature. Despite these global efforts, the efficient treatment of patients is an in-progress challenge. Based on a meta-study of published shreds of evidence about compounds and their botanic sources in the last six decades, a novel multiple-indication herbal compound (Saliravira®) has been developed. Based on the antiviral, anti-inflammatory, and immune-enhancing properties of its ingredients, we hypothesized that Saliravira® has the potential to act as an antiviral agent, accelerate treatment, and reduce undesirable effects of COVID-19. Methods In this randomized, controlled, open-label clinical trial, COVID-19 outpatients were included by RT-PCR test or diagnosis of physicians according to the symptoms. Participants were randomly divided into intervention and control groups to receive Saliravira® package plus routine treatments of COVID-19 or routine treatments of COVID-19 alone, respectively. Saliravira® package includes tablets, nasal-sinuses spray, oral-pharynx spray, and inhaler drops. The treatment was for 10 days and followed up till 23 days after admission. Results On the 8th day, the “mean reduction rates” of viral load of the patients in the intervention group was 50% lower compared to the control group with a p-value < 0.05. The improvement of 10 out of 14 COVID-19 symptoms in the intervention group was significantly accelerated. The mean treatment duration of patients in the intervention group was 4.9 days less than the control group. In addition, no patients in the intervention group were hospitalized compared to 28% of the control group needed to be hospitalized. Data availability Data supporting reported results that is not given here is available on request from the corresponding author. This data is not publicly available due to privacy requirements.

Engineering Hydrology, 1993

A mathematical model is developed for the uptake of contaminants by overland flow. The model is b... more A mathematical model is developed for the uptake of contaminants by overland flow. The model is based on the numerical solution of the Navier-Stokes equations coupled with a two-equation turbulence model in the vertical plane. The numerical solution is performed on a deforming finite-element grid that locates the free surface by coupling the kinematic boundary condition equation with the flow equations. The dynamic free-surface condition is enforced by letting all stresses vanish. Empirical proximity functions are used for both the solid bed and the free surface, which diminishes turbulent fluctuations as these boundaries are approached.

Hydraulic Engineering, 1990

Parshall flumes are widely used for metering open channel flows. An inspection of the original st... more Parshall flumes are widely used for metering open channel flows. An inspection of the original study which developed the rating equations indicates that the flumes were not tested for as low of flows as currently recommended for their use. An experimental investigation indicates that the rating equations significantly over-predict discharge at low flow rates. The discrepancy can be as much as 25 percent for the range flows recommended for the flume studied. This can be apparently be attributed to viscous effects from findings on two geometrically similar flumes.

Land Degradation & Development, 2020

and it is a condition of accessing publications that users recognise and abide by the legal requi... more and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Linnaeus Eco-Tech, 2017

Toxicity of crude oil for the living world and ecosystems in general is a global problem of both ... more Toxicity of crude oil for the living world and ecosystems in general is a global problem of both aquatic and terrestrial environments. Therefore, the remediation of oil contaminated soils, sediments and groundwater is a major challenge for environmental research. In the target area of this survey which is a petroleum refinery near Tehran, soil and groundwater pollution, its source, contaminated area and distribution of pollution were studied. The investigations showed that the contamination of soil which is mainly silt and clay is expanded until the surface of region groundwater and formed an oily layer with different thicknesses in the whole area. According to the result of free product analysis, the free product is a multi-type mixture of oil and its main ingredients are assumed to be gasoline, kerosene, and gas oil. In addition, pollution sources in the field are thought to be underground pipes, tanks, pipeline and so on. For decontaminating of soil and water resources there are ...

Safety Science, 2017

Abstract Measurement of performance is rooted in quality measurement subject which has been one o... more Abstract Measurement of performance is rooted in quality measurement subject which has been one of the challenging branches of the research in the recent years. Measurement of the performance of an organization in the field of health, safety and environment (HSE) is a prerequisite for continual improvement policy which is the spirit of the new HSE management systems. In this work, after a review of literature, the HSE key performance indicators (KPIs) and frameworks for measurement of HSE performance were reviewed, and a comprehensive classification of KPIs based on three factors (time, scope, and type) was presented. In this research a new framework with an innovative philosophical and mathematical formulation was presented for performance measurement. In the proposed framework, by combination of qualitative and quantitative techniques, a logical selection-aggregation process is performed to determine the performance status from KPIs. The proposed methodology is based on ‘award and punishment’ policy, and it aggregates the negative and positive performance elements to compute the HSE performance index. In this methodology a lead index and a lag index are calculated and combined to compute the overall HSE index. This methodology was used in a case study for performance measurement in three drilling companies. The results indicated that the model is applicable in the industry for HSE performance measurement and monitoring. The presented framework is risk-related and has 12 special characteristics which makes it possible to use it as a basis for development of an international ISO standard for performance measurement.

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2001, 2001

An integrated suite of geophysical methods was used to characterize the hydrogeology of a fractur... more An integrated suite of geophysical methods was used to characterize the hydrogeology of a fractured-rock aquifer to identify contamination or pathways for contaminant migration near a former landfill at the University of Connecticut, Storrs, Connecticut. Surface-geophysical methods were used to identify the dominant direction of fracture orientation and to locate potential leachate plumes. Two shallow, electrically conductive anomalies near surface-water discharge areas north and south of the landfill were interpreted as leachate plumes. Two other sheet-like electromagnetic (EM) anomalies were identified and targeted for drilling and borehole-geophysical investigation. These methods were used to determine the location, orientation, and lateral continuity of fractures and to quantify the hydraulic properties of the transmissive fractures. One borehole was located to intersect an anomaly observed at a depth of about 18 meters. The EM-conductivity log measured a high electrical conductivity anomaly at a depth of 21 meters, which coincides with a layer observed to contain sulfide mineralization. The lack of high conductivity fluids in the borehole supports the interpretation that this anomaly is caused by a lithologic change rather than by fractures that contain conductive leachate. The second borehole was positioned to intersect a conductive feature at a depth of about 18 meters. A fracture with similar strike and dip was observed at a depth of about 22 meters in optical-and acoustic-televiewer images, in borehole-radar surveys, and was determined to be hydraulically conductive during heat-pulse flowmeter tests. This feature was also characterized by a high-conductivity spike in the EM log. Although the specific conductance of the fluid in this depth zone was high, it could not account for the spike in the EM log. The anomaly is interpreted to be caused by a combination of conductive fluids in the fracture and of conductive minerals in the rock. Water-quality samples from a discretely isolated zone near a depth of 22 meters indicated the presence of landfill leachate. This investigation illustrates the effectiveness of the use of combined geophysical methods for identification and evaluation of electrically conductive contaminant plumes.

Proceedings of 2013 SPE Heavy Oil Conference - Canada, 2013

Petroleum Science and Technology, 2014

ABSTRACT Precipitation and seasonal water level fluctuations mostly add to the problem of soil an... more ABSTRACT Precipitation and seasonal water level fluctuations mostly add to the problem of soil and groundwater contamination and lead to pollution of capillary fringe layer and exacerbation of groundwater contamination. At the Tehran Oil Refining Company (TORC), with critical problem of soil and groundwater pollution, finding a suitable remediation method has been a big concern. As bioremediation is one of the most economically and technically attractive decontamination methods, it was chosen for preliminary study to solve this problem. For simulation of the region, soil column treatment method by using oil habituated indigenous microorganisms of the area was selected. The main purpose was assessing the suitability of bioremediation method in the target area for treatment of capillary fringe layer. Two columns (one as treatment column and the other as a control) were designed and the variation of different parameters including dissolved oxygen (DO), pH, the number of viable and active microorganisms (CFU/mL), and biodegradation rate during 30 working days were recorded. The experiments showed that a major part of degrading microorganisms were facultative anaerobic. pH was not an inhibiting factor and the number of active microorganisms was increasing during aeration time. The results of solvent extraction method also revealed that during 30 days, about 6% of total petroleum hydrocarbon in columns was biologically degraded. Finally, it was disclosed that bioremediation method could be effective in solving the area's pollution problem. However, new studies should be conducted to optimize the biodegradation rate and extrapolate from the laboratory scale results to the field ones.

Petroleum Science and Technology, 2013

Soil contamination with crude oil is an important worldwide issue and the remediation of oil cont... more Soil contamination with crude oil is an important worldwide issue and the remediation of oil contaminated soils, sediments and groundwater is a major environmental challenge. In the target area of this survey, which is a petroleum refinery near Tehran, soil and groundwater pollution, and its source, contaminated area, and distribution of pollution were studied by means of different measurements. Oil content and volatile organic compounds were measured to determine soil and groundwater contamination. The investigations showed that the contamination of soil which is mainly silt and clay has reached to the groundwater which is around 20 m underground and formed an oily layer mainly containing gasoline, kerosene, and gas oil with different thicknesses in the whole area. The free oil existing over the groundwater table could be removed by physical ways such as pump and treat method but decontamination of soil is more complex. Due to long-lasting contamination of the field, the existence of accumulated indigenous microorganisms and the probable ability of them to effectively biodegrade pollutants by man-assisted interventions are expected. In this survey in order to clarify the contamination problem, some experiments have been done on the region soil and groundwater. Besides, the feasibility assessment of bioremediation in the investigated area is performed.

Journal of Irrigation and Drainage Engineering, 1991

An inspection of the original study that developed the rating equations for Parshall flumes indic... more An inspection of the original study that developed the rating equations for Parshall flumes indicates that the calibration tests were not conducted for as low of flows as currently recommended for their use. An experimental investigation for one flume size indicates that the rating equations significantly overpredict discharge at low flow rates. The discrepancy can be as much as 25% for the range of flows recommended. An alternate rating equation is developed for use with these low flow rates.

Journal of Loss Prevention in the Process Industries, 2016

Drilling industry, because of the particular conditions relating to its nature, is one of the hig... more Drilling industry, because of the particular conditions relating to its nature, is one of the high-risk and hazardous sectors of petroleum industry. Major and minor accidents in this industry cause losses of lives and result in financial and reputational losses. The first step to reduce accidents and losses in this industry is identification and assessment of the attended risks. After this, the risks can be prioritized in terms of their importance, and then proper long-term strategies to reduce the accidents can be identified and implemented. In this article, with a study of past research and accident statistics and reports, and using standards checklists and expert opinion, significant HSE risks in Iranian drilling industry were identified and assessed with a new structured method. The result of scrutiny of the 60 identified risks showed that management, human and hardware are, respectively, the most important influential factors in accident causation. The results of the assessment of the 20 most important risks also showed that the level of the most of these risks, despite existing controls, was still in unacceptable area. It is expected that with implementation of the controls proposed in this research, the risks will be reduced to an acceptable level. The priority of the strategies to reduce incidents in Iranian drilling industry should be development of long-term strategic plans for implementation of the proposed controls. The method used in this research and the results can be used to reduce accidents in drilling industry worldwide.