Exergy analyzing of a horizontal-axis wind turbine in different conditions based on the BEM method

Journal of Thermal Analysis and Calorimetry - In this study, a horizontal-axis wind turbine based on the first and second laws of thermodynamics in different wind speeds and pitch angles is...     

An Easy and Efficient Synthesis of Bisindolylmethanes and Tetraindolylmethane Tröger's Base Catatlyzed by AgBF4

This work presents a highly efficient and simple method for the synthesis of bisindolylmethanes, catalyzed by AgBF₄, with excellent yields. Various substituted aldehydes and ketones with indole under this reaction condition is elucidated. This reaction occurs efficiently under mild reaction conditions, such as are applied with methoxy or furfural, which commonly undergoes cleavage under strongly acidic reaction conditions. The presented approach was suitable for the synthesis of complex systems, such as tetraindolylmethane Tröger's Base.     

Comprehensive two-dimensional gas chromatography for the analysis of synthetic and crude-derived jet fuels

Fully synthetic jet fuel (FSJF) produced via Fischer-Tropsch (FT) technology was recently approved by the international aviation fuel authorities. To receive approval, comparison of FSJF and crude-derived fuel and blends on their qualitative and quantitative hydrocarbon composition was of utmost importance. This was performed by comprehensive two-dimensional gas chromatography (GC×GC) in the reversed phase mode. The hydrocarbon composition of synthetic and crude-derived jet fuels is very similar and all compounds detected in the synthetic product are also present in crude-derived fuels. Quantitatively, the synthetic fuel consists of a higher degree of aliphatic branching with less than half the aromatic content of the crude-derived fuel. GC×GC analyses also indicated the presence of trace levels of hetero-atomic impurities in the crude-derived product that were absent in the synthetic product. While clay-treatment removed some of the impurities and improved the fuel stability, the crude-derived product still contained traces of cyclic and aromatic S-containing compounds afterwards. Lower level of aromatics and the absence of sulphur are some of the factors that contribute to the better fuel stability and environmental properties of the synthetic fuel. GC×GC was further applied for the analysis of products during Jet Fuel Thermal Oxidation Testing (JFTOT), which measures deposit formation of a fuel under simulated engine conditions. JFTOT showed the synthetic fuel to be much more stable than the crude-derived fuel.     

Taguchi optimization for natural convection heat transfer of Al2O3 nanofluid in a partially heated cavity using LBM

Journal of Thermal Analysis and Calorimetry - In the present study for the first time, Taguchi approach was applied to specify the optimal condition of the parameters in the natural convection heat...     

Facile carbohydrate-based stereocontrolled divergent synthesis of (+)-pericosines A and B

An isomer-divergent synthesis of naturally occurring pericosines A and B is described starting from a known D-ribose derived ene-diol in 35% and 41% overall yields respectively of which the latter is the best synthetic method reported for pericosine B. The key features of this synthesis include the stereoselective NHK vinylation of the terminal aldehyde to the versatile diolefinic chiral intermediate and elegant conversions of the same to the corresponding final products via RCM (Ring Closing Metathesis).