29 research outputs found
Evaluation of the antioxidant activity of amarnathus spinosus Linn., by non enzymatic haemoglycosylation
Amaranthus spinosus Linn. complete plant material was extracted successively by petroleum ether, chloroform, methanol, and water. All the extracts were subjected to in vitro non-enzymatic haemo-glycosylation method, i.e. an oxidation reaction. The degree of haemoglycosylation in the presence of different extracts of Amaranthus spinosus were measured colorimetrically at 520 nm. The preventive effect of haemoglobin glycosylation at the two concentration; 0.5 and 1 mg/mL was estimated as follows: pet. ether; 13.1%, 16.4%, chloroform; 5.7%, 12%, methanol: 36.91%, 56.07% and aqueous: 22.2%, 31.01 %, respectively. The α-tocopheral (Vitamin E) was used as standard
Study on retaining natural refrigerant in seafood processing industries in India
In the seafood processing sector in India, natural refrigerant such as NH3 is currently replaced by Freon refrigerants such as HFC-404A, because these systems are comparably more compact, operate above atmospheric pressure and are less toxic. However, these synthetic refrigerants are one of the major sources of global warming. This paper focuses on a standalone-CO2 system with a multi-ejector for transcritical operation and an NH3-CO2 cascade system considering the climatic conditions of important coastlines covering the majority of catch in India. The annual coefficient of performance is compared, and the results show that the COP of NH3-CO2 cascade system exceeds the HFC-404A system by 35 %. Cascade system performs better for -40 oC deep freezers, and the standalone-CO2 system with heat recovery can be efficiently used for -18 oC cold storage. This study will aid in the retention of natural refrigerants in many seafood cities of India. Keywords: ammonia, carbon dioxide, natural refrigerant, cascade, seafood processingacceptedVersio
Optimization of Multicast Routing Based on a Reliable Effective Framework in Wireless Mesh Networks
An Autonomous Access Point for Cognitive Wireless Networks
In this chapter, we present an application of the Cognitive Networking paradigm to the design and development of autonomous Cognitive Access Point (CogAP) for Wi-Fi hotspots and home wireless networks. In these environments, we typically use only one AP per service provider/residence for providing wireless connectivity to the users. Here we can reduce the cost of autonomic network control by equipping the same AP with a cognitive functionality. We first present the architecture of autonomous CogAP which consists of two main modules: Traffic sensing module and cognitive controller module. The traffic sensing module uses an efficient packet sampling scheme to characterize traffic from all Wi-Fi channels with single wireless interface. The cognitive controller module consists of two submodules: traffic predictor and cognitive decision engine. The Neural Network-based traffic predictor module makes use of the historical traffic traces for traffic prediction on all channels. The cognitive decision engine makes use of traffic forecasts to dynamically decide which channel is best for CogAP to operate on. We have built a prototype CogAP device using off-the-shelf hardware components and obtained better performance with respect to state-of-the-art channel selection strategies
Bifurcation analysis of modified Leslie-Gower predator-prey model with double Allee effect
In the present article, a modified Leslie-Gower predator-prey model with double Allee effect, affecting the prey population, is proposed and analyzed. We have considered both strong and weak Allee effects separately. The equilibrium points of the system and their local stability have been studied. It is shown that the dynamics of the system are highly dependent upon the initial conditions. The local bifurcations (Hopf, saddle-node, Bogdanov-Takens) have been investigated by considering sufficient parameter(s) as the bifurcation parameter(s). The local existence of the limit cycle emerging through Hopf bifurcation and its stability is studied by means of the first Lyapunov coefficient. The numerical simulations have been done in support of the analytical findings. The result shows the emergence of homoclinic loop. The possible phase portraits and parametric diagrams have been depicted. Keywords: Predator-prey system, Stability, Bifurcation, Double Allee effec
Bifurcation analysis of modified Leslie-Gower predator-prey model with double Allee effect
AbstractIn the present article, a modified Leslie-Gower predator-prey model with double Allee effect, affecting the prey population, is proposed and analyzed. We have considered both strong and weak Allee effects separately. The equilibrium points of the system and their local stability have been studied. It is shown that the dynamics of the system are highly dependent upon the initial conditions. The local bifurcations (Hopf, saddle-node, Bogdanov-Takens) have been investigated by considering sufficient parameter(s) as the bifurcation parameter(s). The local existence of the limit cycle emerging through Hopf bifurcation and its stability is studied by means of the first Lyapunov coefficient. The numerical simulations have been done in support of the analytical findings. The result shows the emergence of homoclinic loop. The possible phase portraits and parametric diagrams have been depicted
Role of pore size analysis in development of zeolite reforming catalyst
Effect of preparation variables on the aromatization activity of Pt/KL catalysts was studied. The aromatic content as well as C5
+ liquid yields
were greatly influenced by the nature of binder material used in catalyst preparation. Detailed characterization of the catalysts indicated that two
factors, namely (1) nature of binder and (2) size and volume of pores, influenced the catalytic activity. Among the catalysts studied the one prepared
by MgO doped basic binder exhibited better performance. Pt loading was also observed to influence the pore volume and aromatization activity of
the catalysts, where the catalyst exhibited decrease in pore volume above 0.4 wt.% Pt loading.
Keywords: KL-zeolite; Pore size distribution; Hysterises loop; t-plot; Pt dispersio