Hygromechanical characterization of sunflower stems

synthesis and characterization of some macrocyclic schiff bases

ماکروسیکلهای شیف باز از اهمیت زیادی در شیمی آلی و دارویی برخوردار می باشند. این ماکروسیکلها با دارابودن گروه های مناسب در مکانهای مناسب می توانند فلزاتی مثل مس، نیکل و ... را در حفره های خود به دام انداخته، کمپلکسهای پایدار تولید نمایند. در این پایان نامه ابتدا یک دی آلدئید آروماتیک از گلیسیرین تهیه می شود و در مرحله بعدی واکنش با دی آمینهای آروماتیک و یا آلیفاتیک در رقتهای بسیار زیاد منجر به ت...

Hygromechanical Behaviour of Painted Wooden Panels from the Cultural Heritage

Provided it has been properly processed and implemented in structural applications, including protecting against biological attacks and accounting for moisture induced movements, wood is able to withstand considerable duration of loading thanks to its good resistance to fatigue and sophisticated multi-scale composite structure. For that reason, it is still present as the structural element of v...

Synthesis and Characterization of Sunflower Oil-Based Polysulfide Polymer/Cloisite 30B Nanocomposites

In current work, halogenated sunflower oil was reacted with Na2S3 to produce sunflower oil-based polysulfide polymer. Cloisite 30B as organomodified nanoclay was used in different contents to investigate its effect on the properties of the synthesized polymer. All nanocomposites were prepared via in situ polymerization method in aqueous media. Fourier Transform-InfraRe...

Biological and Molecular Characterization of an Isolate of Pelargonium Zonate Spot Virus Infecting Sunflower in Argentina

Sunflower (Helianthus annuus) plants showing chlorotic concentric rings and line patterns on the leaves were observed in field crops near Paraná city (Entre Ríos, Argentina). Virus-enriched preparations examined with a trasmission electron microscope contained quasi-spherical particles ca. 33 nm in diameter. Symptomatic sunflower samples were serologically negative for six known members of the ...

Sunflower Resistance to the Red Sunflower Seed Weevil (Coleoptera: Curculionidae)