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Mohassel, Mohammad Hassan Rashed,Aliverdi, Akbar,Hamami, Hossein,Zand, Eskandar The Korean Society of Weed Science and The Turfgra 2010 Weed Biology and Management Vol.10 No.1
Optimizing the herbicide dose by the addition of adjuvants is an acceptable way to reduce the risk of side-effects from herbicides. Therefore, to detect a suitable adjuvant for diclofop-methyl, cycloxydim, and clodinafop-propargyl against littleseed canarygrass (Phalaris minor) and wild oat (Avena ludoviciana), six dose. response experiments were conducted. The treatments consisted of diclofop-methyl at 0, 112, 225, 450, 675, and 900 $g\;ai\;ha^{-1}$, cycloxydim at 0, 15, 30, 60, 90, and 120 $g\;ai\;ha^{-1}$, and clodinafop-propargyl at 0, 8, 16, 32, 48, and 64 $g\;ai\;ha^{-1}$ with and without the adjuvants of Frigate, olive oil, and castor oil at 0. 2% (v/v) in order to control both littleseed canarygrass and wild oat. Tested herbicides performance was enhanced by all adjuvants against littleseed canarygrass and wild oat. The addition of Frigate and the vegetable oils had the lowest and the highest effect on the performance of all of the herbicides on both littleseed canarygrass and wild oat, respectively, which confirms the solubilizing nature of the cuticular waxes by vegetable oils. A comparison between the two vegetable oils revealed that olive oil exerted a greater control of littleseed canarygrass than did the castor oil. In contrast, castor oil exerted a greater control of wild oat than did the olive oil, which can be related to differences in the leaf surface micromorphology of the weeds.
Confirmed resistance to aryloxyphenoxypropionate herbicides in Phalaris minor populations in Iran
Gherekhloo, Javid,Mohassel, Mohammad H. Rashed,Mahalati, Mehdi Nassiri,Zand, Eskandar,Ghanbari, Ali,Osuna, Maria D.,Prado, Rafael De The Korean Society of Weed Science and The Turfgra 2011 Weed Biology and Management Vol.11 No.1
Phalaris minor (littleseed canary grass) is a major weed in wheat fields in some parts of Iran. Diclofop-methyl, fenoxaprop-P-ethyl, and clodinafop-propargyl are three acetyl coenzyme A carboxylase (ACCase)-inhibiting herbicides that are commonly used to control this grass in wheat fields. Thirty-four P. minor populations with suspected resistance to ACCase-inhibiting herbicides were sampled from wheat fields in the provinces of Fars and Golestan in Iran. The dose.response assays that were conducted under controlled greenhouse conditions indicated that 14 populations were resistant to fenoxaprop-P-ethyl, seven populations were resistant to both fenoxaprop-P-ethyl and diclofop-methyl, and three populations were resistant to fenoxaprop-P-ethyl, diclofop-methyl, and clodinafop-propargyl. These populations showed different levels of resistance to the applied herbicides, compared to the susceptible population. These results suggest that different mechanisms of resistance could be involved. The enzyme assay revealed that the existence of modified ACCase in the three most-resistant populations (AR, MR4, and SR3) is responsible for the resistance of these populations.
Energy and Temperature Dependences of the Spin Cutoff Parameter in 50 - 57Cr Isotopes
R. Razavi,A. Rashed Mohassel,A. Rahmatinejad,S. Mohammadi 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.10
The spin cutoff parameters of 50 - 57Cr isotopes have been calculated using a superconducting Hamiltonian with the inclusion of the pairing effect. Their energy and temperature dependences have been studied through comparison with some well-known semi-empirical formulae. This study shows that the microscopic calculation results converge to the Fermi gas model prediction at higher energies. Also, an even-odd effect is evident in the spin cutoff parameters at low temperatures and disappears after the pairing phase transition.
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.
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.
Parisa Pasangi,Mahmoud Atashbar,Mahmood Mohassel Feghhi 한국전자통신연구원 2019 ETRI Journal Vol.41 No.4
In time division duplex (TDD)‐based multiuser massive multiple input multiple output (MIMO) systems, the uplink channel is estimated and the results are used in downlink for signal detection. Owing to noisy uplink channel estimation, the downlink channel should also be estimated for accurate signal detection. Therefore, recently, a blind method was developed, which assumes the use of a linear high‐power amplifier (HPA) in the base station (BS). In this study, we extend this method to a scenario with a nonlinear HPA in the BS, where the Bussgang decomposition is used for HPA modeling. In the proposed method, the average power of the received signal for each user is a function of channel gain, large‐scale fading, and nonlinear distortion variance. Therefore, the channel gain is estimated, which is required for signal detection. The performance of the proposed method is analyzed theoretically. The simulation results show superior performance of the proposed method compared to that of the other methods in the literature.
Sarabi, Vahid,Mahallati, Mehdi Nassiri,Nezami, Ahmad,Mohassel, Mohammad Hasan Rashed The Korean Society of Weed Science and The Turfgra 2011 Weed Biology and Management Vol.11 No.3
Common lambsquarters (Chenopodium album) is one of the world's worst weeds. In order to study the competitive potential of single-cross 704 corn (Zea mays) in competition with common lambsquarters at different relative times of emergence and density levels of the weed, an experiment was conducted in 2006 at the farm of the Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran. This experiment was designed as a split plot based on a randomized complete block design with three replications. The emergence time of the weed was considered at three levels (7 days and 14 days earlier than corn and simultaneously with corn) as the main plot, while the density of the weed was considered at six levels (0, 4, 8, 12, 16, and 20 plants per $m^2$) as the subplot. The results showed a decrease in the grain yield and biomass of corn, as the emergence time of corn was delayed in comparison with the weed in a way that the maximum reduction was observed at the earlier emergence of the weed, compared to corn, and also at a high density of the weed. As the weed emerged earlier than corn, the rate of yield loss resulting from the first flush of weeds was not that high. However, with every few days that the weed emerged earlier than corn, the rate of yield loss became higher as the density of the weed increased to its maximum. The maximum reduction in the yield components was observed at 14 days earlier emergence of the weed, compared to corn, and at high densities, as the corn plants were overshadowed by the weed canopy and no ear was produced.