توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Dynamic multi–attribute decision making model based on triangular intuitionistic fuzzy numbers
نویسنده(ها): ،
اطلاعات انتشار: Scientia Iranica، هجدهم،شماره۲، ۲۰۱۱، سال
تعداد صفحات: ۶
Triangular Intuitionistic Fuzzy Numbers (TIFNs) express more abundant and flexible information than Triangular Fuzzy Numbers (TFNs). The main purpose of this paper is to propose a Dynamic Multi–Attribute Decision Making (DMADM) model on the basis of TIFNs, to solve the DMADM problem, where all the decision information takes the form of TIFNs. A new distance measure between two TIFNs is developed to aid in determining attribute weights, using the entropy method. An aggregation operator, the weighted arithmetic averaging operator on TIFNs (TIFN–WAA), is presented to aggregate the decision information with TIFNs. Finally, the effectiveness and applicability of the proposed DMADM model, as well as analysis of comparison with another model, are illustrated with an investment example.

۲Effects of Nitrogen Application on Soil Nitrification and Denitrification Rates and N2O Emissions in Greenhouse
نویسنده(ها): ، ، ،
اطلاعات انتشار: Journal of Agricultural Science and Technology، هفدهم،شماره۲، ۲۰۱۵، سال
تعداد صفحات: ۱۲
Nitrous oxide (N2O) has significant impact on global warming and leads to the depletion of ozone in the stratosphere. Agricultural soil is regarded as a major source of N2O emissions. In recent years, greenhouse grown vegetables have rapidly developed in China. Although excessive fertilizer application in greenhouse vegetable production can result in increased N2O emissions, research data on such emissions from greenhouse vegetables, such as cucumber, remains limited. In this study, four nitrogen (N) fertilizer treatments including 1,200 (N1200, traditional N amount), 900 (N900), and 600 kg N ha–1 (N600) and the control (N0) were carried out on cucumber in a greenhouse in the North China Plain. Results showed that N2O emissions mainly occurred in the first five days after topdressing, and accounted for 75.8%–95.2% of total N2O emissions produced in the whole interval (10 days). Significant exponential correlations were observed between N2O flux and nitrification or denitrification rates (P 0.01). The results also indicated that nitrification dominated and played a more important role in N2O emissions than denitrification under the irrigation conditions of the study (water–filled pore spacewas 40.0 to 66.6%). Cumulative N2O emissions were 0.48–5.01 kg N ha–1 in the cucumber growing season, accounting for 0.28–0.38% of nitrogen input. Compared to N1200, treatment N600 significantly reduced the rate of N2O emissions by 53.4%, and also maintained cucumber yield. Based on this study, 50% of the traditional N fertilizer rate (N600) was considered sustainable for greenhouse cucumber production in the North China Plain.

۳GGE Biplot–Based Evaluation of Yield Performance of Barley Genotypes across Different Environments in China
نویسنده(ها): ، ، ، ، ، ، ، ،
اطلاعات انتشار: Journal of Agricultural Science and Technology، هجدهم،شماره۲، ۲۰۱۶، سال
تعداد صفحات: ۱۱
The yield performance of 23 barley (Hordeum vulgare L.) genotypes in sixteen test environments across a barley growing region of China was evaluated. The experiment was conducted using a randomized complete block design with three replicates, in two cropping seasons (2010–2011, in the South; 2012–2013, in the North). The GGE biplot was applied to analyze the data obtained in the multi–environment trials. The results indicated that either the North or South test sites could be grouped into three possible megaenvironments, the best– performing and candidate genotypes for the North and South were G7 (Zhongsimai1), G5 (08B26), G17 (G231M004M), and G13 (Zhe3521), respectively. Among the sixteen test environments, E6 (Shihezi) and E12 (Yancheng) had the greatest discriminating ability, while E1 (Haerbing), E4 (Shang kuli), E8 (Wuhan), and E16 (Chengdu) could be dismissed from the future trials due to the similarity of their ability of discrimination and representation.
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