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Effect of soil pore size distribution on plant-available water and least limiting water range as soil physical quality indicators

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Pedosphere 2020年第2期30卷 253-262页

作者： Mehdi ZANGIABADI Manoochehr GORJI Mehdi SHORAFA saeed khavari khorasani saeed SAADAT Department of Soil Science University of TehranKaraj 31587-11167Iran Department of Seed and Plant Improvement Khorasan-Razavi Agricultural and Natural Resources Research CentreMashhad 91659-66416Iran Department of Sustainable Land Management Soil and Water Research InstituteKaraj 31779-93545Iran

Soil pore size distribution(SPSD) is one of the most important soil physical properties. This research investigated the relationships of location and shape parameters of the SPSD curves with plant-available water(PAW) and least limiting water range(LLWR) of the light-textured soils at the Torogh Agricultural Research Station in north-eastern Iran. Soil moisture release curve(SMRC), PAW and LLWR in matric heads of 100 and 330 h Pa for the field capacity and location and shape parameters of the SPSD curves of 30 soils with different texture and organic carbon contents were determined, and the variable relationships were statistically analyzed. The results showed that the median equivalent pore diameter(de), mean de, standard deviation(SD*), and skewness of the SPSD curves were significantly correlated with PAW(PAW330) and LLWR(LLWR330) measured in a matric head of 330 h Pa. Decrease in deand increase in the diversity of soil pore size(SD*) increased PAW330 and LLWR330. The SD* values of all the soil samples were lower than the optimal ranges suggested in literature. Neither PAW nor LLWR values were significantly different in the soils with the optimal modal deand those with non-optimal modal de. Optimal values of median and mean equivalent pore diameters and kurtosis of SPSD curves led to a significant improvement of PAW330 and LLWR330 as soil physical quality indicators. It was recommended to revise the optimal ranges for SD* and modal defor future studies.

关键词： equivalent pore diameter kurtosis location parameter matric head shape parameter skewness soil pore size distribution curve soil water availability

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The Electrical Parameters Modeling and Experimentation of Copper Vapor Laser

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Circuits and Systems 2016年第1期7卷 23-28页

作者： Fatemeh Rafighi saeed Behrouzinia Kamran khorasani Masoud Sabaghi Saeid Marjani Central Tehran Department of Physics Islamic Azad University Tehran Iran Laser and Optics Research School Nuclear Science and Technology Research School Atomic Energy Organization of Iran Tehran Iran Department of Electrical Engineering Ferdowsi University of Mashhad Mashhad Iran

In this paper, the present developments of copper vapor laser technology were computational modeling and simulations methods. In most of the cases, before the experiment, the functions of electrical parameters can be predicted by the use of physical simulation codes. A single simulation model describing the discharge circuitry was introduced. By solving the equations of circuit via Runge-Kutta method, the current and voltage pulses of the discharge tube were investigated, which are in good agreement with the experimental results of the same laser.

关键词： Copper Vapor Laser Electrical Parameters Simulation Method

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