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RISS 인기검색어
- 검색키워드
- 저자 : Rashed Hosseini (검색결과 3 건)
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Scour Depth Estimation Methods around Pile Groups
Rashed Hosseini,Ata Amini 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.7
Pile groups have become more popular in structural designs due to economical and geotechnical reasons. It is also known that scour as the main cause of bridge failure can make serious damages and considerably threaten the safety of our environment. Thus, predicting scour depth is an essential step in designing bridges. This paper is a comprehensive review of local scour depth estimation methods around pile groups. Few studies investigated the effect of various parameters on the scour depth and some of them derived empirical equation for estimating the scour depth. Therefore, this review is divided into two different parts. In the first part, the experimental studies and results in the literature are reviewed. In the second part, those works that introduced methods for estimating scour depth are described. The methods of the second part are categorized into two sections: (1) empirical equations; (2) neural network procedures. The first section is the summary of those works that introduced empirical equations for estimating scour depth and the second section is the summary of recently introduced neural network procedures.
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Genetic diversity of Iranian wild barley (Hordeum spontaneum Koch.) populations
Hosseini Mojtaba,Yassaie Mohsen,Rashed-Mohassel Mohammad Hassan,Ghorbani Reza,Niazi Ali 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.3
An efective weed management program requires a comprehensive knowledge of a weed’s genetic diversity. Wild barley (Hordeum spontaneum Koch) is known as an invasive weed that is rising in commercial cereal felds of Iran. Genetic diversity of 31 populations of Iranian wild barley consisting of 27 populations from Fars province along with four collected from Alborz, Kermanshah, Khuzestan, and Lorestan provinces was investigated using 15 ISSR markers. Cluster analysis showed that populations were divided into six main groups based on 88.5% similarity level. According to PCoA results, seven groups were determined based on populations’ data. The maximum similarity is recorded between Fasa and Darab populations (95.6%) and the minimum was noted between Sepidan and Mohr (78.6%). Genetic variation within the investigated wild barley populations (53%) was higher than between populations (47%). Results of Mantel test revealed a correlation between population distance and latitude, rainfall, annual temperature, and population geographic distances. Generally, latitudes, annual mean temperature, and annual mean rainfall are infuenced by genetic diversity of wild barley in Iran.
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Hosseini, Seyed Ahmad,Mohassel, Mohammad Hasan Rashed,Spliid, Niels Henrik,Mathiassen, Solvejg Kopp,Kudsk, Per The Korean Society of Weed Science and The Turfgra 2011 Weed Biology and Management Vol.11 No.2
Wild barley (Hordeum spontaneum) is one of the most troublesome weed species in winter wheat (Triticum aestivum) in Iran. Two bioassay experiments were conducted in order to study the response of wild barley and wheat to different herbicides and to study the efficacy of pre-emergence (PRE), postemergence (POST), and PRE followed by POST applications of sulfosulfuron on wild barely. Moreover, the degradation of sulfosulfuron was studied by liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS).The results showed that wild barley was highly tolerant to clodinafop-propargyl and its dry weight was reduced by only 15%, compared to the control, at the recommended dose (64 $g\;ai\;ha^{-1}$). Sulfosulfuron reduced the wild barley biomass by ${\leq}50%$ at the highest dose (90 $g\;ai\;ha^{-1}$) in the first bioassa but by not more than 20% and 12% at the recommended dose (22 $g\;ai\;ha^{-1}$) in the first and second bioassay, respectively. Significant differences were found among the application methods of sulfosulfuron, with the POST application being the least effective method. In contrast to the POST application, wild barley was severely injured by the PRE application of sulfosulfuron, with an $ED_{50}$ dose of 7.3 $g\;ai\;ha^{-1}$. The degradation study showed that wild barley can metabolize sulfosulfuron that is applied POST, but at a lower rate than wheat. By 4 h after application, wild barley had metabolized 26% of the sulfosulfuron, compared to 46% by wheat. In conclusion, wild barley can metabolize the recommended dose of sulfosulfuron that is applied POST; thus, the PRE application of sulfosulfuron or other integrated methods should be considered for the effective control of wild barley in wheat.
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