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Growth through export: evidence from Iran’s manufacturing plants
, Article Journal of Economic Studies ; Volume 47, Issue 1 , 23 January , 2020 , Pages 111-131 ; Madnanizdeh, S. A ; Sobhani, F. Z ; Sharif University of Technology
Emerald Group Publishing Ltd
2020
Abstract
Purpose: Does the long-term growth rate of a firm increase by exporting? If yes, how large is that increase in a developing economy? The paper aims to discuss this issue. Design/methodology/approach: The authors incorporate data from the manufacturing plants in Iran as a developing economy for 2003–2011 to address this question. Using fixed effect panel and propensity score matching method, the authors examine whether exportation can affect a firm’s growth rate to test for the learning to grow hypothesis. Findings: The findings document that: not only the exporters are larger and more productive than non-exporters, but they also grow faster in size and productivity measures as well....
Modular Development of Space Stations in Space Inspiring from Plant Growth Pattern(Based on Bionics Logic)
,
M.Sc. Thesis
Sharif University of Technology
;
Malaek, Mohammad Bagher
(Supervisor)
Abstract
Building fast and economic space station requires systematic approach toward their design. This research serves to investigate such idea based on Bionic approach. Based on lengthy observations on plant growth we have been able to propose different types of polyhedrons which could help expedite the construction procedure. Different case studies show that how the objectives could be achieved. There are two differences in growth of the modern structures in space and plants. The first is inexistence of producer near the points of growth and Second difference is inexistence of fixed lines for transporting mass. The first difference is not solvable with today's technologies but for second...
Exploring the Impact of Vegetation Type and Plant Growth Cycle on the Evapotranspiration Storage Selection Function Using Particle Tracking Approach
, M.Sc. Thesis Sharif University of Technology ; Danesh Yazdi, Mohammad (Supervisor)
Abstract
StorAge selection (SAS) functions describe the mechanism by which water particles with different ages exit a hydrological system through outfluxes such as streamflow and evapotranspiration (ET). The shape of the ET SAS functions affects the storage residence time distributions, ET travel time distributions, and discharge travel time distributions that control the hydrochemical dynamics of water. They also carry fundamental information to understand the response behavior of the system, and are affected by processes such as precipitation, outflow, ET, as well as the physical properties of the system. To better understand the shape of these functions, other important factors such as the type...
Potential of Calendula alata for phytoremediation of stable cesium and lead from solutions
, Article Environmental Monitoring and Assessment ; Volume 181, Issue 1-4 , Oct , 2011 , Pages 63-68 ; 01676369 (ISSN) ; Arjmandi, R ; Moogouei, R ; Sharif University of Technology
2011
Abstract
Calendula alata plants were tested for their potential to remove stable cesium and lead from solutions in a 15-day period. The plants were grown hydroponically and placed in solutions containing CsCl and Pb(C 2H 3O 2)2 at different concentrations (0.6, 2 and 5 mg l-1). When plants were incubated in CsCl solutions 46.84 ± 2.12%, 41.35 ± 1.59%, and 52.06 ± 1.02% cesium was found to be remediated after 15 days. Moreover, more than 99% lead was removed from the Pb(C 2H 3O 2)2solution in all three concentrations after 15 days during the same period. When both CsCl and Pb(C 2H 3O 2)2were supplemented together in the solution, 9.92 ± 1.22%, 45.56 ± 3.52%, and 46.16 ± 1.48% cesium and 95.30 ± 0.72%,...
Plant hormones as signals in arbuscular mycorrhizal symbiosis
, Article Critical Reviews in Biotechnology ; Vol. 34, issue. 2 , 2014 , p. 123-133 ; Abrishamchi, A ; Khoshbakht, K ; Niknam, V ; Sharif University of Technology
Abstract
Arbuscular mycorrhizal (AM) fungi are non-specific symbionts developing mutual and beneficial symbiosis with most terrestrial plants. Because of the obligatory nature of the symbiosis, the presence of the host plant during the onset and proceeding of symbiosis is necessary. However, AM fungal spores are able to germinate in the absence of the host plant. The fungi detect the presence of the host plant through some signal communications. Among the signal molecules, which can affect mycorrhizal symbiosis are plant hormones, which may positively or adversely affect the symbiosis. In this review article, some of the most recent findings regarding the signaling effects of plant hormones, on...