Cassia angustifolia Vahl is known for the production of leaves and pod shells containing high-value glycosides (sennosides) with enormous medicinal properties to cure constipation in all over the world. However, data on its agricultural practices is limited. The present study aim to optimize the...

Lignin is an under-utilized biopolymer, but it can be modified to broaden its application in industry. In this work, a lignin-based coagulant was prepared by periodate oxidation of hydrolysis lignin that contained carbohydrates. The results showed that water-soluble oxidized hydrolysis lignin (O...

The oxide surface layers formed by the method of microarc oxidation (MAO) on aluminum alloys with different silicon content has been investigated. The microhardness, porosity, thickness, chemical and phase composition, as well as the adhesion strength of the MAO-layers formed on the alloy AK4-1 ...

Anodic aluminum oxide (AAO) film was sealed by graphene oxide-filled sol-gel (GO/sol-gel) and effects of sealing on corrosion resistance and paint adhesion of the film were studied. Samples sealed by boiling water and sol-gel were used for comparison. Cross-sectional analysis of samples was cond...

The development of new rechargeable metal-ion (Na+, K+ or Al3+) batteries (MIBs) with high performance would break the global monopoly on lithium-ion batteries (LIBs). However, because of the larger ionic sizes of Na+, K+ and Al3+ in comparison to Li+, the requirement of electrode materials with...

A research on the effect of different buffers on the pH range of 6–10 on the thin oxide-covered surface of aluminum cathode has been conducted under the conditions corresponding with those generally used in bioaffinity assays or other determinations made by using aluminum probe based on time-re...

In present study, low cost single phase potassium aluminum oxide (K2Al2O4) was synthesized by solid state route and used as catalyst for production of biodiesel from a rural feedstock kusum oil via methyl transesterification reaction. The prepared catalyst was characterized by various techniques...

Ceramic coatings were produced on the surface of commercially pure (CP) aluminum using plasma electrolytic oxidation in electrolyte solutions containing potassium permanganate. Morphology, microstructure, chemical composition and microhardness of the coatings were studied in different conditions...

It has been found that the olfactory properties of a range of essential oils and isolates may be improved by small doses of radiation. At the dose most favourable to the process, no changes in the physical or chemical properties of the irradiated oils can be detected. In the case of Brazilian pe...

The thermal decomposition of some dialkylbis(η5-cyclopentadienyl)metals in pentane and toluene solutions at 60°–80 °C have been studied. The metals were Ti, Zr, Hf, Nb, Ta, Mo, and W. The alkyls were n-propyl, n-butyl, n-amyl, neopentyl, and neohexyl. Dineopentylbis(η5-pentamethylcyclopenta...

Reaction of the incompletely condensed silsesquioxane derivative Cy7Si7O9(OH)3 (1) with Ti(OEt)4 affords the dimeric titanasilsesquioxane [(Cy7Si7O12)Ti(μ-OEt)(EtOH)]2 (13) in 81% yield. The known titanasilsesquioxane [Cy7Si7O11(OSiMe3)]2Ti (18) has been prepared through a modified procedure st...

Reduction of dichloro-{1,3-bis(η5-tetramethylcyclopentadienyl)-1,1,3,3-tetramethyldisiloxane}titanium(IV), [TiCl2{η5:η5-(C5Me4SiMe2)2O}] (1), with magnesium in the presence of bis(trimethylsilyl)ethyne affords the ansa-[Ti{η5:η5-(C5Me4SiMe2)2O}(η2-Me3SiCCSiMe3)] (2) complex in high yield...

Methylenecyclopropane (1a) reacts with bis(trimethylphosphane)titanocene (8) and (η2-1-butene)(trimethylphosphane)zirconocene (12a) via olefin complexes; e.g. 9, in a [2+2] cycloaddition to afford the metallacyclopentane derivates 10, 13 and 14. In contrast, a [3+2] cycloaddition reaction is ob...

Qualitative investigations of the mechanisms of photochemical decomposition of diphenylpermethyltitanocene and zirconocene have been made. Reductive elimination as well as homolytic cleavage of metal-carbon 0-bonds are the two major pathways for photodecomposition of the diphenylpermethylmetallo...

Results of a study of the autoxidation of bis(η5-pentamethylcyclopentadienyl)zirconium alkyls of the general formulae Cp★2ZrR·X (where R = Me, CH2Ph; X = R, Cl) and that of the mixed cyclopentadienyl Cp★CpZr(CH2Ph)2 are described. Rates of initiation and oxidation are compared with those for...

Bis(pentamethylcyclopentadienyl)metal dichlorides, CP*2MCl2 (M = Ti, Zr, Hf), react with vinyllithium in the molar ratio1/2to form the corresponding divinyl compounds Cp*2M(CH=CH2)2. The hafnium compound can be isolated pure. The titanium and zirconium compounds can be detected by low-temperatur...

The high-performance liquid chromatographic separation of bis(η5-1,2,3,4,5-pentamethylcyclopentadienyl)-titanium, zirconium and hafnium dichlorides was demonstrated on cyano-bonded silica under normal-phase gradient elution conditions. Data reported include capacity factors, separation efficien...

In the present investigation, an attempt has been made to weld the precipitation hardened Nickel based super alloy Inconel 718 and austenitic stainless steel AISI 316L using Continuous Current Gas Tungsten Arc Welding (CCGTAW) and Pulsed Current Gas Tungsten Arc Welding (PCGTAW) process employin...

The Small Punch Creep (SPC) behavior of 316L(N) stainless steel has been evaluated under various loads in the range 300–1000 N over a temperature range 898–973 K. The SPC curves clearly showed the transient, secondary and tertiary stages of creep. The transient creep deflection data have been ...

Giga-cycle fatigue (107 ˂ N ˂ 1010 cycles) is subject of interest of the most important research centres in the world. This interest is involved by existing fatigue fractures of real mechanical parts after more than billions cycles and with growing demands on reliability and safety of structural...