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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Solar Energy Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Forest,Global warming,Solar radiation,Reflectance,Reforestation
- چکیده:
- چکیده انگلیسی: Albedo is the fraction of solar energy reflected from a surface back to the atmosphere; it is controlled by the characteristics of the surface, specially land cover type. Here, we examined the effects of five types of tree species (maple, poplar, chestnut-leaved oak, cypress and alder) in the mono-cultured plantations at Hyrcanian temprature forests (in the north of Iran). The field data were collected during the summer and the winter. Albedo was estimated by an albedometer set-up that was installed on a movable mast in each stand. In this study, two analytical methods were used to estimate the reaction of forest trees to the summer and winter albedo. One way ANOVA was used to determine the significance difference between tree species considering the summer and winter albedo. The analysis of variance indicated that, there was a significant difference among tree species albedo in two seasons (p˂ 0.01). In the summer alder and cypress had the highest and lowest albedo (0.34 and 0.16 respectively) and in the winter chestnut-leaved oak and alder had the highest albedo (0.19) and cypress had the lowest one (0.10). Our findings suggest that considering of these factors (summer and winter albedo), plantation with broadleaved trees is the most appropriate choice for forest regeneration in the temperate Iranian forests.
- انتشار مقاله: 26-06-1398
- نویسندگان: Leila Vatani,Seyed Mohsen Hosseini,Mahmoud Raeini Sarjaz,Seyed Jalil Alavi,Seyed Saeed Shamsi,Mohammad Javad Zohd Ghodsi
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Nanochemistry
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی: A modified electrode composed of horseradish peroxidase (HRP) trapped onto silica Sol-Gel/multi-walled carbon nanotubes (MWCNTs) matrix on carbon paste electrode (CPE) developed and applied for determination of methyldopa by electrocatalytic oxidation of methyldopa with HRP for the first time. The proposed biosensor showed linear response in two ranges of 1 μmol L-1 to 3.5 mmol L-1 and 3.5 mmol L-1 to 12 mmol L-1, and detection limit was obtained about 25.3 nmol L-1. The biosensor performance was much better than a lot of previously reported sensors and biosensors for methyldopa determination. This modified electrode was successfully used for accurate determination of methyldopa in urine and pharmaceutical samples. Using the developed biosensor provided an accurate, sensitive and repeatable method for methyldopa measurement in pharmaceutical and urine samples.
- انتشار مقاله: 09-07-1397
- نویسندگان: Javad Ghodsi,Amir Abbas Rafati,Yalda Shoja
- مشاهده