among the low–dimensional allotropes of carbon, nanotubes and graphene have attracted very much attention from nano–science and nanotechnology specialists. they have been proposed as building blocks in nanometer device engineering. however, these structures are not defect–free. in this thesis, we focused on defective carbon nanotubes and graphene, and studied the effect of couple of very common...

Nowadays induction of polyploidy using mutagenic chemicals to increase secondary metabolic production as a modification method of pharmaceutical plants is very usual. A factorial experiment based on completely randomized design with three replications was carried out on Sistan's native fenugreek (Trigonellafoenum_graecum). Colchicine concentration in four levels (0.2, 0.5, 0.75 and 1 gl-1) and ...

the speech act of disagreement has been one of the speech acts that has received the least attention in the field of pragmatics. this study investigates the ways power relations, social distance, formality of the context, gender, and language proficiency (for efl learners) influence disagreement and politeness strategies. the participants of the study were 200 male and female native persian s...

the present study aimed to investigate representation of discourse markers and metadiscourse markers in conversations and readings of general elt coursebook series used in the language centers of iran. to this aim, four elt coursebooks popularly taught in language centers of this country were analyzed based on fung and carter’s (2007) framework regarding discourse markers and hyland’s (2005) fr...

abstract the variables affecting the nature of reading comprehension can be classified into two general categories: reader’s variables, and text variables (alderson, 2000). despite the wave of research on vocabulary knowledge as reader’s variable, the role of this knowledge in c-test as a text-dependent test and its interaction with lexical cohesion of the test as a text feature has remained a...

Rose with scientific name Rosa hybrida is one of the important ornamental plants and one of the 10 top cut flowers in the world. To investigate the effects of foliar application of sodium nitroprusside (as nitric oxide source) and putrescine on some growth and flowering characteristics of Rose ‘Avalanche’, an experiment was conducted  as a factorial trial in a completely randomized design with ...

In order to investigate the effects of simultaneous application of vermicompost and putrescine on reproductive characteristics and biochemical traits of greenhouse cucumbers greenhouse cv Yalda a factorial Pot experiment, based on completely randomized design with three replications was conducted in of Mohaghegh Ardabili University in 2014. Experimental treatments include Substrates containing ...