نتایج جستجو برای: growth temperature
تعداد نتایج: 1236783 فیلتر نتایج به سال:
This article makes a contribution towards understanding the impact of temperature fluctuations on the economy and financial markets. Using historical aggregate U.S. data we show that temperature negatively impacts future growth up to 10 years. We present a long-run risks model with temperature related natural disasters. The model simultaneously matches observed temperature and consumption growt...
Carbon nanotubes (CNTs), nowadays, are one of the important nanomaterials that can be produce with different methods such as chemical vapor deposition (CVD). Growing of CNTs via CVD method can be influenced by several operating parameters that can affect their quality and quantity. In this article, the effects of inlet gas mixture temperature on CNT’s local growth rate, total production, and le...
The present study aims to investigate the structure and trend of climate parameters affecting grape growth in Khorasan Razavi (north eastern Iran) in the period of 1991-2015 in 8 weather stations. Effective climate elements such as temperature, precipitation, the number of hot days, the number of frost days, sunshine hours and parameters such as maximum temperature, annualaverageannual average ...
in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...
the effect of temperature variation on the growth of carbon nanotubes (cnts) using thermal chemical vapor deposition (tcvd) is presented. nickel and cobalt (ni-co) thin films on silicon (si) substrates were used as catalysts in tcvd technique. acetylene gas was used in cnts growth process at the controlled temperature ranges from 850-1000 ̊ c. catalysts and cnts characterization was carried out ...
Trees have been affected by environmental changes, including climatic conditions. Thus, the study on anatomical and morphological characteristics of tree rings provides the possibility of climate study. The present investigation aimed to study the effect at climatic factors such as temperature (maximum, medium and minimum), precipitation on the growth rings of Pinus brutia. 30 Pinus brutia tree...
Trees can record long-term effects of climate variables. Using dendroclimatology knowledge, we can reconstruct such variables especially for areas which have short-term climatic data. For this purpose, we reconstructed the temperature degree of the warm months (May-September) through annual rings width of Quercus persica and regression analysis of data obtained from stations on Dena region. Wit...
West Africa is vulnerable to the effects of climate change. This paper analyzed the impacts of climate change on economic growth in Anglophone West Africa with similar background, during the periods 1969-2016. Five growth model equations have been developed to incorporate climate change variables into the model. Panel data estimations such as the fixed effect model, random effect model and Haus...
Due to variances in response of different tree species in different habitats to climate changes, further studies in this field is clearly required. On the other hand, the lack of studies on chronology to evaluate the effect of solar radiation on radial growth of tree species due to lack of long term data of an important climatic variable, new approaches to determine the effect of this parameter...
The nucleation and growth of sol-gel derived TiO2 colloidal nanoparticles have been studied using experiment and theory as well. In this study, the temperature effect on the formation of TiO2 nanoparticles was discussed and some effective parameters such as the supply rate of solute (Q0), the mean volumic growth rate of stable nuclei during the nucleat...
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