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Amini, Afshin,Amini, Babak,Nejadzadeh, Afsaneh,Sharif, Habib Korean Mathematical Society 2018 대한수학회지 Vol.55 No.5
In this paper, we define right singular clean rings as rings in which every element can be written as a sum of a right singular element and an idempotent. Several properties of these rings are investigated. It is shown that for a ring R, being singular clean is not left-right symmetric. Also the relations between (nil) clean rings and right singular clean rings are considered. Some examples of right singular clean rings have been constructed by a given one. Finally, uniquely right singular clean rings and weakly right singular clean rings are also studied.
Afshin Amini,Babak Amini,Afsaneh Nejadzadeh,Habib Sharif 대한수학회 2018 대한수학회지 Vol.55 No.5
In this paper, we define right singular clean rings as rings in which every element can be written as a sum of a right singular element and an idempotent. Several properties of these rings are investigated. It is shown that for a ring $R$, being singular clean is not left-right symmetric. Also the relations between (nil) clean rings and right singular clean rings are considered. Some examples of right singular clean rings have been constructed by a given one. Finally, uniquely right singular clean rings and weakly right singular clean rings are also studied.
Amini, Moharram,Zamzamian, Seyed Mehrdad,Fadaei, Amir Hossein,Gharib, Morteza,Feghhi, Seyed Amir Hosein Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.10
Applying the available neutron flux for medical and industrial purposes is the most important application of research reactors. The neutron radiography system is used for non-destructive testing (NDT) of materials so that it is one of the main applications of nuclear research reactors. One of these research reactors is the 5 MW pool-type light water research reactor of Tehran (TRR). This work aims to investigate on materials and location of the beam tube (BT) of the TRR radiography system to improve the index parameters of BT. Our results showed that a through-type BT with 20 cm thick carbon neutron filter, 1.2 cm and 9.4 cm of the diameter of inlet (D<sub>1</sub>) and output (D<sub>2</sub>) BT, respectively gives thermal neutron flux almost 25.7, 5.6 and 1.1 times greater than the former design of the TRR (with D<sub>1</sub> = 1.8 cm and D<sub>1</sub> = 9.4 cm), previous design of the TRR with D<sub>1</sub> = 3 cm and D<sub>1</sub> = 9.4 cm, and another design with D<sub>1</sub> = 5 cm and D<sub>1</sub> = 9.4 cm, respectively. Therefore, the design proposed in this paper could be a better alternative to the current BT of the TRR.
FIXED POINT THEORY FOR INWARD SET VALUED MAPS IN HYPERCONVEX METRIC SPACES
Amini-Harandi, A.,Farajzadeh, A.P.,O'Regan, D.,Agarwal, R.P. The Youngnam Mathematical Society Korea 2008 East Asian mathematical journal Vol.24 No.4
In this paper, we first introduce inwards set valued maps in hyperconvex metric spaces. Then we present fixed point theory for continuous condensing inward set valued maps.
SEMI-ASYMPTOTIC NON-EXPANSIVE ACTIONS OF SEMI-TOPOLOGICAL SEMIGROUPS
Amini, Massoud,Medghalchi, Alireza,Naderi, Fouad Korean Mathematical Society 2016 대한수학회보 Vol.53 No.1
In this paper we extend Takahashi's fixed point theorem on discrete semigroups to general semi-topological semigroups. Next we define the semi-asymptotic non-expansive action of semi-topological semi-groups to give a partial affirmative answer to an open problem raised by A.T-M. Lau.
NUMERICAL SOLUTION OF STOCHASTIC DIFFERENTIAL EQUATION CORRESPONDING TO CONTINUOUS DISTRIBUTIONS
Amini, Mohammad,Soheili, Ali Reza,Allahdadi, Mahdi Korean Mathematical Society 2011 대한수학회논문집 Vol.26 No.4
We obtain special type of differential equations which their solution are random variable with known continuous density function. Stochastic differential equations (SDE) of continuous distributions are determined by the Fokker-Planck theorem. We approximate solution of differential equation with numerical methods such as: the Euler-Maruyama and ten stages explicit Runge-Kutta method, and analysis error prediction statistically. Numerical results, show the performance of the Rung-Kutta method with respect to the Euler-Maruyama. The exponential two parameters, exponential, normal, uniform, beta, gamma and Parreto distributions are considered in this paper.
Antifungal Effect of Plant Essential Oils on Controlling Phytophthora Species
Amini, Jahanshir,Farhang, Vahid,Javadi, Taimoor,Nazemi, Javad The Korean Society of Plant Pathology 2016 Plant Pathology Journal Vol.32 No.1
In this study, antifungal activity of essential oils of Cymbopogon citratus and Ocimum basilicum and two fungicides Mancozeb and Metalaxyl-Mancozeb in six different concentrations were investigated for controlling three species of Phytophthora, including P. capsici, P. drechsleri and P. melonis on pepper, cucumber and melon under in vitro and greenhouse conditions, respectively. Under the in vitro condition, the median effective concen- tration ($EC_{50}$) values (ppm) of plant essential oils and fungicides were measured. In greenhouse, soil infested with Phytophthora species was treated by adding 50 ml of essential oils and fungicides (100 ppm). Disease severity was determined after 28 days. Among two tested plant essential oils, C. citratus had the lowest $EC_{50}$ values for inhibition of the mycelial growth of P. capsici (31.473), P. melonis (33.097) and P. drechsleri (69.112), respectively. The mean $EC_{50}$ values for Metalaxyl-Mancozeb on these pathogens were 20.87, 20.06 and 17.70, respectively. Chemical analysis of plant essential oils by GC-MS showed that, among 42 compounds identified from C. citratus, two compounds ${\beta}$-geranial (${\alpha}$-citral) (39.16%) and z-citral (30.95%) were the most abundant. Under the greenhouse condition, Metalaxyl-Mancozeb caused the greatest reduction in disease severity, 84.2%, 86.8% and 92.1% on melon, cucumber, and pepper, respectively. The C. citratus essential oil reduced disease severity from 47.4% to 60.5% compared to the untreated control ($p{\leq}0.05$). Essential oils of O. basilicum had the lowest effects on the pathogens under in vitro and greenhouse conditions. These results show that essential oils may contribute to the development of new antifungal agents to protect the crops from Phytophthora diseases.
Amini Sirous,Mohamadzamani Davood,Javidan Seyed Mohamad 한국농업기계학회 2022 바이오시스템공학 Vol.47 No.3
Purpose This research investigates the main specifications of eggshell which are the thickness of the shell and its strength. For this purpose, random sampling was implemented on 180 fresh and healthy eggs of Bovance breed produced at Ghazvin province agricultural jihad organization’s training center. Methods To measure the shell thickness, four methods, dial gauge, ultrasound waves, micro-meter and photometer, were applied. Due to its precision, the indicator hour destructive measurement method was selected as the control method. Results By analyzing and comparing data collected through 4 methods in the research, a significant difference between measurement methods was revealed. Moreover, comparing the measurement methods with the control method (dial gauge), the lowest measurement error was that of the ultrasound wave measurement method with 7.1% and the highest was that of the photometer method with 15.7%. Furthermore, regression equations are determined for the referred measurement methods with the shell strength. Conclusion It was observed that the ultrasound method compared to other methods proposed in this study is more accurate for measuring the thickness of the eggshell non-destructively. Therefore, the non-destructive ultrasonic measurement method can be a suitable alternative to these methods due to the proximity of the measured values to non-destructive, direct, and accurate destructive methods. Since the ultrasound method is a fast and relatively inexpensive method, this method can be used in the quality grading process of eggs.
Mizoroki@?Heck reaction over palladium nanoparticles supported on WO<sub>3</sub>
Amini, M.,Heydarloo, D.B.,Rahimi, M.,Kim, M.G.,Gautam, S.,Chae, K.H. Pergamon Press 2016 Materials research bulletin Vol.83 No.-
Palladium nanoparticles supported on metal oxide WO<SUB>3</SUB>were synthesized and the physicochemical properties of compounds were characterized by X-ray diffraction (XRD), X-ray absorption near edge spectroscopy (XANES) at O and Pd K-edges, energy dispersive X-ray analysis (EDX), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The catalytic activity of compounds in the carbon@?carbon coupling reactions of aryl halides with olefins (Mizoroki@?Heck reaction) was studied. The catalyst can be easily separated from the reaction mixture and reused after washing without reduction in activity.