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- 저자 : Hamid Heydari (검색결과 3 건)
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Experimental and mathematical analysis of electroformed rotating cone electrode
Hamid Heydari,Salman Ahmadipouya,Amirhossein Shoaee Maddah,Mohammad-Reza Rokhforouz 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.4
In this study, we present results of a mathematical model in which the governing equations of electroforming process were solved using a robust finite element solver (COMSOL Multiphysics). The effects of different parameters including applied current density, solution electrical conductivity, electrode spacing, and anode height on the copper electroforming process have been investigated. An electroforming experiment using copper electroforming cell was conducted to verify the developed model. The obtained results show that by increasing the applied current density, the electroforming process takes place faster, thereby resulting in a higher thickness of the electroformed layer. In addition, higher applied current density led to non-uniformity of the coated layer. It was revealed that by increasing electrolytic conductivity from 5 to 20 S/m, the electroformed layer became thicker. By considering three different anode heights, it was found that if the cathode and anode are the same height, the process will be more effective. Finally, it was concluded that there is an optimum value of anode-cathode spacing: above it, energy consumption and plating time are high; while below it, the resultant layer is non-uniform. The present study demonstrates that the developed model can accurately capture the physics of electroforming with a reasonable computational time.
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Making a Case for Adaptive Reuse as a Strategy to Revitalize and Generate Urban
Hamid Nakhaie,Amin heydari nejad,Asma Esmail Zadeh 세계문화관광학회 2010 Conference Proceedings Vol.11 No.0
Shopping is one of the unavoidable characteristics of consumer society, and not only considered as an economic activity but also as a social and cultural one. It is probable that the goal of a tourist is to visit a shopping place not to buy; but he/she may buy something's during visit this essay attempts to offer some definitions of shopping places, management of shopping places and tourism. The effect of management of shopping places on tourism is also given; unfortunately this effect is not considered so much.
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Soheili Forough,Heydari Mehdi,Woodward Stephen,Abdul-Hamid Hazandy,Naji Hamid Reza 한국산림과학회 2023 Forest Science And Technology Vol.19 No.2
The morphological and anatomical characteristics of leaves are sensitive and adaptable to environmental changes. Determining eco-physiological patterns of leaf characteristics along elevational gradients allows for a better understanding and prediction of how plants might respond to climate change. In this work, the ecological adaptation mechanisms related to morphological and anatomical characteristics of Brant’s oak (Quercus brantii Lindl.) leaves were studied at three elevation classes (low, middle, and high) in two different Mediterranean and subhumid climates in Zagros forests in western Iran. There were no sig- nificant changes in leaf length, although the leaf-specific area was higher at low and middle elevations in subhumid climates. In addition, stomata length, width, density, and stomatal pore index were higher in the upper elevations of subhumid climate than in the Mediterranean climate. At low and middle elevations, dry matter content was higher at sites from the Mediterranean climate. The results of plasticity indices showed that individuals of Q. brantii from middle-elevation sites exhibited greater plasticity than those from low and high-elevation sites. Overall, Q. brantii, the dominant oak species in Zagros forests, appears to respond to elevational and environmental changes, suggesting that leaves can adapt to these changes through morphological and anatomical traits. These results provide new insights into the environmental adaptation strategies of plants at the morphological and anatomical levels against climate change.
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