بررسی اثر بخشی برخی روشها بر کنترل سیلاب شهری و حفظ محیط زیست
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 15th سپتامبر 2016
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بررسی اثر بخشی برخی روشها بر کنترل سیلاب شهری و حفظ محیط زیست
ایران جزء ۰۱ کشور اول دنیا به لحاظ تنوع و حجم وسیع خسارات ناشی از وقوع حوادث قهری بوده،بررسی آمار و اطلاعات خسارت ناشی از وقوع سیلاب در ایران بیانگر گستردگی صدمات ناشی از سیلاببه منابع طبیعی، انسانی و اقتصادی مناطق مختلف می باشد. افزایش سطوح نفوذ ناپذیری که ناشی ازشهرسازی و احداث ساختمان بر خاکهای نفوذ پذیر است، طبعا از سطوح نفوذ پذیر حوضه که قادر بهجذب بخشی از بارندگی است کاسته و بر حجم کل رواناب شهر افزوده است. در گذشته همه…
Investigation distribution of heavy metals contamination (As ,Co,Ni,Pb) in sediments in Dohezarriver (Iran- Tonekabon) and interpolation pollution usi
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 15th سپتامبر 2016
- بدون نظر
Investigation distribution of heavy metals contamination (As ,Co,Ni,Pb) in sediments in Dohezarriver (Iran- Tonekabon) and interpolation pollution usi
In this study, concentrations of heavy metals arsenic, cobalt, nickel and lead in samples of sedimentin the river dohezar tonekabonhas been paid. concentration changes as follows: Arsenic: 4 / 10_66 /70, Cobalt: 5 / 40_29 / 80, nickel: 12_80 and lead: 9 / 10_66 / 40 (ppm).The distribution of these four elements other than arsenic that the significant increase in surfacesediments show a similar distribution to the rest of the elements.GIS software interpolation toestimate the male and Pollution discussed….
Nerium indicum miller shrub as an accumulation of lead (pb) atoms in the Death Valley ecosystem in Behbahan, Iran
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 15th سپتامبر 2016
- بدون نظر
Nerium indicum miller shrub as an accumulation of lead (pb) atoms in the Death Valley ecosystem in Behbahan, Iran
Death Valley is located in the north of Behbehan city. The degree of water toxicity is able to cause lethal effects to human and animal particularly in the first 100 meters distance from the source of the spring….
بررسی فاکتورهای مهم تاثیر گذار بر مشخصات و ارتقا کیفیت سوخت زیستی
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 14th سپتامبر 2016
- بدون نظر
بررسی فاکتورهای مهم تاثیر گذار بر مشخصات و ارتقا کیفیت سوخت زیستی
سوخت زیستی یک مایع با رنگ قهوه ای قرمز تیره تا تقریبا سیاه میباشد که رنگ آن بستگی به ترکیب -شیمیایی و میزان ذرات زغال موجود در مایع دارد. هدف از ارتقا سوخت زیستی، بهبود کیفیت آن است؛یعنی، کاهش یا حذف یک یا چند مشخصه نامطلوب آن. این امر نیازمند درک کامل خصوصیات وویژگیهای سوخت زیستی است. هدف از ارتقا سوخت زیستی، بهبود کیفیت آن است؛ یعنی، کاهش یاحذف یک یا چند مشخصه نامطلوب آن. این امر نیازمند درک کامل خصوصیات و ویژگیهای سوختزیستی است.کیفیت را…
An Investigation into Biocompatibility and Biodegradability of PLLA Nano-Scaffold using Electrospinning
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 14th سپتامبر 2016
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An Investigation into Biocompatibility and Biodegradability of PLLA Nano-Scaffold using Electrospinning
Tissue engineering provides a new research field. In this new research field, cell, scaffold and biomolecules are used to create an extended landscape in restoration, repair and maintenance of tissues. In this study, nano properties of polymer scaffolds for tissue engineering purposes are discussed.PLLA polymer scaffold was created using electrospinning technique ,chloroform solvent and DMF. Then the surface of scaffold was treated to improve biodegradability. Scaffold was investigated in terms of surface morphological characteristics, biodegradablility, porosity and pore size. For this purpose, porosity measurements with Archimedes law, biodegradablility test and scanning electron microscopy study were performed. Degradation rate of scaffold is high because there are small pores and…
Acid rain and environmental problems
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 14th سپتامبر 2016
- بدون نظر
Acid rain and environmental problems
Acid rain is an outcome of air pollution which was first discovered in 1581. Acid rain formation is due to the atmospheric discharge of sulfur and nitrogen oxides which are mainly the outcome of burning the fossil fuels. Acid rain can cause environmental disruptions like; damaging the forests, lakes, groundwater, and soils. The damage caused by acid rain depends on the level of acid deposition and the natural sensitivity of soils and water bodies. There are set of solutions suggested which some are used for prevention of acid rain (such as international protocols issued to reduce emissions and using alternative ways to produce energy) and others for recovery of affected areas (such as liming process used to neutralize acidic lakes and streams)….
Determination of mono- and dinitrotoluene isomers in contaminated real petrohemial wastewaters using ethylenedichloride (EDC)-based dispersive liquid-
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 14th سپتامبر 2016
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Determination of mono- and dinitrotoluene isomers in contaminated real petrohemial wastewaters using ethylenedichloride (EDC)-based dispersive liquid-
This paper describes adispersive liquid-liquid microextraction (DLLME), using 1,2-dichloroethane (EDC) as extractionsolvent associated with gas chromatography-flame ionization detector (GC-FID) for determination of traces of 2-nitrotoluene (2-NT), 3-nitrotoluene (3-NT), 4-nitrotoluene (4-NT), 2,4-dinitrotoluene (2,4-DNT) and 2,6-dinitrotoluene (2,6-DNT) in an aqueous medium. In this analytical procedure, asuitable mixture of extraction solvent (EDC) and dispersive solvent (methanol) was rapidly injected into aqueous samples. This process caused the formation of cloudy solution,which consisted of dispersed fine droplets of extraction solvent and aqueous phase. After centrifugation of the cloudy solution, the fine droplets of extraction solvent sedimented in the tail end of the conical test…
Environmental pollutants enrichment in Soil, surface sediments and water resources by Mining activities, a case study; Zarshuran mine, NW Iran
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 14th سپتامبر 2016
- بدون نظر
Environmental pollutants enrichment in Soil, surface sediments and water resources by Mining activities, a case study; Zarshuran mine, NW Iran
Contamination of soil and water environment by heavy metals in a mining area and their effect on the soil and water characteristics were determined. Despite the ever-increasing development in mining activities in Iran, a little attention has been given to the environmental impacts in some cases. In this study, distribution of pollutants (As, Sb, Ag, and Zn) in natural resources such as surface soil, sediments and water, in addition to adjacent rock of river bed has been investigated. Correlations between these elements, sizes of sedimentary grains, and the reasons of solution and precipitation of minerals have also been studied and compared. Additionally the effects of some of the natural geochemical barriers on transferring elements have been introduced. Distribution of pollutant…
HEALTH AND SAFETY RISK ASSESSMENT OF BEHSHAHR’S COMPOST STUFF BY WILLIAM FINE METHOD
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 14th سپتامبر 2016
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HEALTH AND SAFETY RISK ASSESSMENT OF BEHSHAHR’S COMPOST STUFF BY WILLIAM FINE METHOD
Compost production process in the compost factory of Behshahr, Mazandaran Province, is accompanied with different hazards in terms of safety, health and environment due to nature and activities. As a result, there is the possibility of harm to humans, in the event of an accident. In this research William fine, FMEA method was used to evaluate health and safety risks of Behshahr’s compost plant. In these models, aspects recognition and ranking are based on objective observation sand the previous experiences o f accidents. Therefore,111 aspects were studied and 78 of them were identified and assessed with the risk priority number higher than degree of risk-taking and were divided to three levels of very high and high (%14), moderate (%84) and normal levels (224) and were analyzed and…
الویت بندی ارزیابی ریسک محیط زیستی احداث اسکله بندر کاسپین منطقه آزاد انزلی با استفاده از روش های AHP و TOPSIS
- takbook
- آب و هواشناسی ( اقلیم شناسی )
- 14th سپتامبر 2016
- بدون نظر
الویت بندی ارزیابی ریسک محیط زیستی احداث اسکله بندر کاسپین منطقه آزاد انزلی با استفاده از روش های AHP و TOPSIS
ارزیابی ریسک زیست محیطی گامی فراتر از ارزیابی بوده و در آن علاوه بر بررسی و تحلیل جنبههای مختلف ریسک، ضمن شناخت کامل ازمحیط زیست منطقۀ تحت اثر، میزان حساسیت محیط زیست متأثر و همچنین ارزشهای خاص زیست محیطی منطقه نیز در تجزیه و تحلیل وارزیابی ریسک منطقه درنظر گرفته میشود.جهت انجام این مطالعه ابتدا با استفاده از بازدید میدانی فعالیت هایی که منجر به بروز ریسک درعملیات ساخت اسکله بندر کاسپین شده ،شناسایی و به منظور استخراج ریسک های حایز…