نتایج جستجو برای: removal rate
تعداد نتایج: 1083422 فیلتر نتایج به سال:
in this study, degradation of p-chlorophenol (p-cp) was evaluated using persulfate (ps) activated zerovalent iron (zvi) based ultraviolet (uv) in a bench scale photoreactor. the effect of operational parameters such as solution ph (3, 7, and 11), reaction time (0-60 minutes), zvi dosage (0.15, 1.25, 0.5, 1, and 1.5 mm), ps concentration (0.5, 1.5, 2, 2.5, 3, and 4 mm), and initial p-cp concentr...
purpose: to evaluate the visual and anatomical outcomes and complications of vitrectomy with or without removal of internal limiting membrane (ilm) in idiopathic macular hole (imh) at labbafinejad medical center, tehran-iran, 1993-2003. methods: hospital records of patients who had undergone vitrectomy for imh and completed 6 months of follow up were reviewed for demographic data and outcomes o...
background petro-clival, clival and spheno-petro-clival tumours are still a neurosurgical challenge. usually, the classical skull base transpetrous approaches are employed, although they are burdened by an important rate of morbidity, and a very low rate of radical removal is reported. conclusions anterior transoral and transsphenoidal approaches are indicated for clival and spheno-petro-clival...
employees always concern about losing their job , or in other word , losing their income resources. for this purpose, every government requires strong system for covering these concerns. the unemployment insurance (ui) program’s can be used for achieving this goal. in this thesis, we price ui based on the insurance history of employee and the duration of being unemployed. we use the weibull dis...
background: entry of untreated wastewater of wool scouring factories has been associated with many environmental hazards because of high rate of pollution. presently effective treatment methods and reducing the costs of operation and maintenance from treatment units have always been under the attention of this industry owners. the aim of this survey is to present a suitable method for the treat...
the study of air infiltration into the buildings is important from several perspectives that may be noted to energy and design of hvac systems, indoor air quality and thermal comfort and design of smoke control systems. given the importance of this issue, an experimental and numerical study of air infiltration through conventional doors and windows has been explored in iran. to this end, at fir...
Background and purpose: Textile dye effluents have some potential risks which require effective treatment before discharging into the environment. Advanced oxidation processes can remove pollutants faster than other processes due to active hydroxyl radical production; therefore, increase the efficiency of dye removal. This study was aimed at investigating dye removal process using UVA/ZnO and U...
Gear fabrication in wire electrical discharge machining (WEDM) plays an important role manufacturing industries. This paper describes the analysis and optimization of process parameters for spur gear on brass workpiece (10cmx15cmx6mm) material by EDM process. The experiments were performed using design experiment (DoE) approach removal rate (MRR) was analyzed response surface methodology techni...
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