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Assessing the response of dryland barley yield to climate variability in semi-arid regions,Iran

Journal of Arid Land 2021年第9期13卷 905-917页

作者： mohammad KHEIRI Jafar KAmBOUZIA Reza DEIHImFARD saghi m moghaddam Seyran ANVARI Department of Agroecology Environmental Sciences Research InstituteShahid Beheshti UniversityTehran ***Iran Faculty of Environmental Sciences Czech University of Life Sciences PraguePrague 16500Czech Republic

Precipitation and temperature are the most abiotic factors that greatly impact the yield of crop,particularly in ***,as the main cereal is predominantly cultivated in dryland and the livelihood of smallholders depends on the production of this crop,particularly in arid and semi-arid *** study aimed to investigate the response of the grain yield of dryland barley to temperature and precipitation variations at annual,seasonal and monthly scales in seven counties of East and West Azerbaijan provinces in northwestern Iran during *** index(HI)was calculated and its relationship with dryland barley yield was evaluated at annual and monthly *** results showed that the minimum,maximum and mean temperatures increased by 0.19℃/a,0.11℃/a and 0.10℃/a,respectively,while annual precipitation decreased by 0.80 mm/a during *** in study area has become drier by 0.22/a in annual HI during the study *** effects of increasing temperature on the grain yield of dryland barley were more severe than the positive effects of increasing ***,weather variations in April and may were related more to the grain yield of dryland barley than those in other *** grain yield of dryland barley was more drastically affected by the variation of annual minimum temperature comparing with other weather ***,our findings illustrated that the grain yield of dryland barley increased by 0.01 t/hm^(2) for each unit increase in annual HI during ***,any increase in the monthly HI led to crop yield improvement in the study area,particularly in the drier counties,i.e.,myaneh,Tabriz and Khoy in Iran.

关键词： humidity index crop yield spatiotemporal variation temperature precipitation

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人工神经网络与遗传算法预测液体晃荡参数的比较

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哈尔滨工程大学学报（英文版） 2024年第2期23卷 292-301页

作者： Hassan saghi mohammad Reza Sarani Nezhad Reza saghi Sepehr Partovi Sahneh Department of Civil Engineering Hakim Sabzevari UniversitySabzevarIran Department of Electrical and Computer Engineering University of BirjandBirjandIran State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian116024China Department of marine Engineering Amirkabir University of TechnologyTehranIran

This paper develops a numerical code for modelling liquid *** coupled boundary element-finite element method was used to solve the Laplace equation for inviscid fluid and nonlinear free surface boundary *** Nakayama and Washizu’s results,the code performance was *** the developed numerical mode,we proposed artificial neural network(ANN)and genetic algorithm(GA)methods for evaluating sloshing loads and comparing *** compare the efficiency of the suggested methods,the maximum free surface displacement and the maximum horizontal force exerted on a rectangular tank’s perimeter are *** can be seen from the results that both ANNs and GAs can accurately predict η_(max) and F_(max).

关键词： Sloshing loads Fluid structure interactions Potential flow analysis Artificial neural network Genetic algorithm

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Generation of linear and nonlinear waves in numerical wave tank using clustering technique-volume of fluid method

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Applied mathematics and mechanics(English Edition) 2012年第9期33卷 1179-1190页

作者： H.saghi m.J.KETABDARI S.BOOSHI Department of Civil Engineering Ferdowsi UniversityMashhad 91779-4897Iran Faculty of marine Technology Amirkabir University of TechnologyTehran 15875-4413Iran

A two-dimensional （2D） numerical model is developed for the wave sim- ulation and propagation in a wave flume. The fluid flow is assumed to be viscous and incompressible, and the Navier-Stokes and continuity equations are used as the governing equations. The standard k-e model is used to model the turbulent flow. The Navier- Stokes equations are discretized using the staggered grid finite difference method and solved by the simplified marker and cell （SmAC） method. Waves are generated and propagated using a piston type wave maker. An open boundary condition is used at the end of the numerical flume. Some standard tests, such as the lid-driven cavity, the constant unidirectional velocity field, the shearing flow, and the dam-break on the dry bed, are performed to valid the model. To demonstrate the capability and accuracy of the present method, the results of generated waves are compared with available wave theories. Finally, the clustering technique （CT） is used for the mesh generation, and the best condition is suggested.

关键词： numerical wave tank free surface simulation Navier-Stokes equation stag-gered grid clustering technique (CT) wave generation

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A New Arrangement with Nonlinear Sidewalls for Tanker Ship Storage Panels

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Journal of Ocean University of China 2013年第1期12卷 23-31页

作者： m. J. Ketabdari H. saghi Faculty of marine Technology Amirkabir University of Technology Department of Civil Engineering Ferdowsi University

Sloshing phenomenon in a moving container is a complicated free surface flow problem. It has a wide range of engineering applications, especially in tanker ships and Liquefied Natural Gas (LNG) carriers. When the tank in these vehicles is partially filled, it is essential to be able to evaluate the fluid dynamic loads on tank perimeter. Different geometric shapes such as rectangular, cylindrical, elliptical, spherical and circular conical have been suggested for ship storage tanks by previous researchers. In this paper a numerical model is developed based on incompressible and inviscid fluid motion for the liquid sloshing phenomenon. The coupled BEm-FEm is used to solve the governing equations and nonlinear free surface boundary conditions. The results are validated for rectangular container using data obtained for a horizontal periodic sway motion. Using the results of this model a new arrangement of trapezoidal shapes with quadratic sidewalls is suggested for tanker ship storage panels. The suggested geometric shape not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing effects more efficiently than the existing geometric shapes.

关键词： tanker ships storage panels sloshing phenomenon quadratic sidewalls

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Numerical simulation of sediment deposition and trapping efficiency estimation in settling basins, considering secondary flows

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International Journal of Sediment Research 2020年第4期35卷 347-354页

作者： Esmail Lakzian Hassan saghi Omid Kooshki Center of Computational Energy Department of Mechanical EngineeringHakim Sabzevari University Aalto University marine Technology Department of Civil Engineering Hakim Sabzevari University

In this paper,sediment deposition and trapping efficiency in shallow rectangular reservoirs were numerically estimated considering secondary *** order to do this,three dimensional(3D) steady,incompressible,Reynolds-averaged Navier-Stokes(RANS) equations with the standard κ-ε turbulence model were used as the governing *** drift-flux model also was used to model the solid *** the next step,the developed model was validated using the available *** it was used to simulate the sediment deposition and trapping efficiency in shallow rectangular reservoirs,considering secondary *** results show the sediment is trapped in the inlet corner of the reservoir,and two pairs of large vortices on the sides and two pairs of small vortices at the inlet corner of the reservoir are ***,the effects of the input angle of the reservoir to the trapping efficiency are evaluated and the results are discussed.

关键词： Sedimentation Deposition Secondary flows Numerical computation Trapping efficiency

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Optimization of Baffled Rectangular and Prismatic Storage Tank Against the Sloshing Phenomenon

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China Ocean Engineering 2020年第5期34卷 664-676页

作者： Hassan saghi NING De-zhi CONG Pei-wen ZHAO ming Department of Civil Engineering Hakim Sabzevari UniversitySabzevar ***Iran State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China School of Computing Engineering and MathematicsUniversity of Western SydneyPenrithNSW 2751Australia

The fluid motion in partially filled tanks with internal baffles has wide engineering applications. The installation of baffles is expected to reduce the effect of sloshing as well as the consequent environmental damages. In the present study, a series of experimental tests are performed to investigate the sloshing phenomenon in a baffled rectangular storage tank. In addition, the sloshing phenomenon is also modeled by using Open Foam. Based on the experimental and numerical studies, optimization of the geometric parameters of the tank is performed based on some criteria such as tank area, entropy generation, and the horizontal force exerted on the tank area due to the sloshing *** optimization is also carried out based on the entropy generation minimization analysis. It is noted that the optimum baffle height is in the range of h_b/h_w=0.5-0.75 in the present study(where h_b and h_w are the baffle height and water depth, respectively). Based on the results, the optimal design of the tank is achieved with R_A= 0.9-1.0(where R_A=L/W, L and W are the length and width of the tank, respectively). The results also show that the increase of h_b can lead to a decrease of the maximum pressure and horizontal force exerted on the tank. It is also noted that the horizontal force exerted on the tank firstly continues to increase as the sway motion amplitude ***, as the normalized motion amplitude parameter, a/L(The parameter a is the motion amplitude), exceeds0.067, the effect of motion amplitude on the force is not obvious. The same optimization is also performed in the multiple-variable-baffled tank and prismatic storage tank.

关键词： baffled rectangular storage tank experimental tests sloshing phenomenon optimization entropy generation Open Foam

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A hepatocellular carcinoma–bone metastasis-on-a-chip model for studying thymoquinone-loaded anticancer nanoparticles

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Bio-Design and manufacturing 2020年第3期3卷 189-202页

作者： Fatemeh Sharifi Ozlem Yesil-Celiktas Aslihan Kazan Sushila maharjan saghi Saghazadeh Keikhosrow Firoozbakhsh Bahar Firoozabadi Yu Shrike Zhang Division of Engineering in medicine Department of MedicineBrigham and Women’s HospitalHarvard Medical SchoolCambridgeMAUSA School of mechanical Engineering Sharif University of TechnologyTehranIran Department of Bioengineering Faculty of EngineeringEge UniversityBernovaIzmirTurkey

We report the development of a metastasis-on-a-chip platform to model and track hepatocellular carcinoma(HCC)-bone metastasis and to analyze the inhibitory effect of an herb-based compound,thymoquinone(TQ),in hindering the migration of liver cancer cells into the bone *** bioreactor consisted of two chambers,one accommodating encapsulated HepG2 cells and one bone-mimetic niche containing hydroxyapatite(HAp).Above these chambers,amicroporous membrane was placed to resemble the vascular barrier,where medium was circulated over the *** was observed that the liver cancer cells proliferated inside the tumor microtissue and disseminated from the HCC chamber to the circulatory flow and eventually entered the bone *** number of metastatic HepG2 cells to the bone compartment was remarkably higher in the presence of HAp in the *** was then used as ametastasis-controlling agent in both free form and encapsulated nanoparticles,to analyze its suppressing effect on HCC *** indicated that the nanoparticle-encapsulated TQ provided a longer period of inhibitory *** summary,HCC-bone metastasis-on-a-chip platform was demonstrated to model certain key aspects of the cancer metastasis process,hence corroborating the potential of enabling investigations on metastasis-associated biology as well as improved anti-metastatic drug screening.

关键词： Tumor-on-a-chip Organ-on-a-chip Hydroxyapatite Hepatocellular carcinoma Thymoquinone

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Optimization of a Dual-Baffled Rectangular Tank Against the Sloshing Phenomenon

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Journal of marine Science and Application 2022年第1期21卷 116-127页

作者： Hassan saghi Dezhi Ning Shunqi Pan Reza saghi Department of Civil Engineering Hakim Sabzevari UniversitySabzevar ***Iran State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Hydro-environmental Research Centre School of EngineeringCardiff UniversityCardiff CF243AAUK mSc of Hydraulic engineering Mashhad BranchIslamic Azad UniversityMashhad ***Iran

A dual-baffled rectangular tank with different configurations is proposed to reduce the sloshing effect,and design optimization is conducted through numerical simulations with open-source software,namely OpenFOAm,based on the computational fluid dynamic model.A series of physical experiments in the dual-baffled rectangular tank is performed for model validation and design optimization with the measured water surface elevation distributions along the *** optimization uses the calculated maximum horizontal force exerted on the tank and entropy generation(EG)as the *** show that the dual-baffle configuration positioned at the tank center is more effective in reducing the sloshing than that of the single baffle when the relative baffle height and initial water depth ratio(Hb/Hw,where Hb and Hw represent baffle height and static water depth,respectively)are larger than ***,such an effect then diminishes when the ratio is larger than *** effect of the dual-baffle configuration on the sway motion under the condition of different motion amplitudes and frequencies is also *** results show that the reduction in the maximum horizontal force is almost the same for dual-and single-baffled configurations and reaches the minimum when the sway motion amplitude is near 0.03 *** dual-baffled configuration for the angular frequency of the sway motion is more effective than the single-baffled in reducing the sloshing at the low angular frequencies but is only less effective at high angular ***,the optimal baffle inclination angle is 85°when the inclined straight and curved baffles are used,and curved baffles can successfully decrease the horizontal force exerted on the tank and EG.

关键词： Rectangular storage tank Dual-baffled rectangular tank Sloshing phenomenon Optimization Horizontal force Entropy generation

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Numerical Simulation of Sloshing in Rectangular Storage Tank Using Coupled FEm-BEm

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Journal of marine Science and Application 2012年第4期11卷 417-426页

作者： Hassan saghi mohammad Javad Ketabdari Department of Civil Engineering Ferdowsi University Mashhad 91779-48974 Iran Faculty of marine Technology Amirkabir University of Technology Tehran 15875-4413 Iran

Sloshing of liquid can increase the dynamic pressure on the storage sidewalls and bottom in tanker ships and LNG careers. Different geometric shapes were suggested for storage tank to minimize the sloshing pressure on tank perimeter. In this research, a numerical code was developed to model liquid sloshing in a rectangular partially filled tank. Assuming the fluid to be inviscid, Laplace equation and nonlinear free surface boundary conditions are solved using coupled FEm-BEm. The code performance for sloshing modeling is validated against available data. To minimize the sloshing pressure on tank perimeter, rectangular tanks with specific volumes and different aspect ratios were investigated and the best aspect ratios were suggested. The results showed that the rectangular tank with suggested aspect ratios, not only has a maximum surrounded tank volume to the constant available volume, but also reduces the sloshing pressure efficiently.

关键词： rectangular storage tank sloshing phenomenon aspect ratio coupled FEm-BEm

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Exploring the Reduction of Pollutant and Greenhouse Gas Emissions by Utilizing Solar Zero Energy Buildings in Iran

Exploring the Reduction of Pollutant and Greenhouse Gas Emis...

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作者： Javad Eshraghi Nima mirkhani Nima Narjabadifam saghi Sadoughi mehdi Ashjaee Department of mechanical Engineering University of Tehran

Systems utilizing renewable energies can provide clean,reliable,secure and competitive energy products to help meet the rapidly increasing global energy *** paper explores the reduction of pollutant and greenhouse gas emissions by utilizing solar Zero Energy Building(ZEB) for a typical detached house in *** description about the design of such a building is *** the fact that electricity and natural gas consumption are covering 75 % of building energy consumption in Iran,this analysis includes two points of view,a direct and an indirect *** analysis is conducted by investigation of consumption of natural gases in conventional homes while electricity generation at power plants requires indirect analysis in order to calculate consequent pollution ***,the reduction of social costs which go along with reduction in pollutant and greenhouse gas emissions,are *** suggest that implementation of a ZEB in Iran reduce pollutants and greenhouse gases up to 4759 kg of CO per family annually.

关键词： Pollutants and greenhouse gases social costs zero energy building for Tehran

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