Bharathiar University

About: Bharathiar University is a education organization based out in Coimbatore, Tamil Nadu, India. It is known for research contribution in the topics: Thin film & Adsorption. The organization has 5812 authors who have published 8628 publications receiving 143934 citations. The organization is also known as: BU.

Observer-Based Synchronization of Complex Dynamical Networks Under Actuator Saturation and Probabilistic Faults

Abstract: This paper investigates the observer-based synchronization problem for a family of complex dynamical networks subject to time delay, external disturbance, randomly occurring actuator faults, and input saturation. A realistic actuator fault model is considered in which the actuator faults are represented by stochastic variables that are assumed to obey a certain probabilistic distribution. An $H_{\infty}$ performance-related criterion is obtained via the Lyapunov-Krasovskii functional approach and stochastic analysis technique to asymptotically minimize the synchronization error and observer error simultaneously. Moreover, to meet the requirement of actuator saturation, the conditions for the domain of the attraction region are determined by employing the linear matrix inequality (LMI) approach and an optimization technique. Specifically, the proposed controller for the network synchronization is very simple and easy to implement in practical systems. Furthermore, the gain values of controller and observer gains are calculated by solving a set of LMIs. Eventually, the proposed theoretical results are verified through numerical simulations.

Mycorrhiza of plants in different vegetation types in tropical ecosystems of Xishuangbanna, southwest China.

Abstract: We examined plants growing in four tropical vegetation types (primary forest, secondary forest, limestone forest and a slash and burn field) in Xishuangbanna, southwest China for mycorrhizal associations. Of the 103 plant species examined (belonging to 47 families), 81 had arbuscular mycorrhizal (AM) associations, while three species possessed orchid mycorrhiza. AM colonization levels ranged between 6% and 91% and spore numbers ranged between 1.36 spores and 25.71 spores per 10 g soil. Mean AM colonization level was higher in primary and secondary forest species than in plant species from limestone forests and a slash and burn field. In contrast, mean AM fungal spore numbers of the primary and limestone forest were lower than in the secondary forest or the slash and burn field. AM fungal spores belonging to Glomus and Acaulospora were the most frequent in soils of Xishuangbanna. AM fungal colonization and spore numbers were significantly correlated to each other and were significantly influenced by vegetation type.

Augmentation and starvation of calcium, magnesium, phosphate on lipid production of Scenedesmus obliquus

Abstract: Theoretical evaluation of algal biodiesel shows extravagance and economical impedance. Lipid productivity has been a prominent strategy to attain economic viability. The present study investigates the effect of starvation and supplementation of Ca, Mg and P on growth and lipid accumulation in microalga Scenedesmus obliquus. Calcium and phosphate starvation induced lipid accumulation by 52.9% and 47.6% of DCW (dry cell weight) respectively; supplementation with 300 mgL-1 of magnesium induced lipid accumulation by 54.6% DCW. Interestingly growth was not affected at 300 mg/L of magnesium and conditions like calcium and phosphate starvation affected the growth but not completely retarded. The statistical studies with Box-Behnken model revealed that the macronutrients exerted their significant impact on growth and lipid accumulation individually than interactively.

Synthesis, Spectra and Electrochemistry of Ru(III) Complexes with Tetradentate Schiff Bases

Abstract: A series of low-spin ruthenium(III) complexes of the type [RuX(EPh3)(LL')] (X = Cl, Br; E = P, As; LL' = Salen, Salpn and Saldien) have been synthesised by reacting [RuCl3(PPh3)3], [RuCl3(AsPh3)3], [RuBr3(AsPh3)3] or [RuBr3(PPh3)2(MeOH)] with tetradentate Schiff bases such as bis(salicylaldehyde)ethylenediimine (H2-Salen), bis(salicylaldehyde)propylenediimine (H2-Salpn) and bis(salicylaldehyde)diethylenetriimine (H2-Saldien). All complexes have been characterized by elemental analyses, IR and electronic spectra, EPR, magnetic moment and cyclic voltammetric data.