Structure of a Viscoplastic Flow During the Mold-Filling Process

The flow of a viscoplastic fluid during the filling of a flat vertical channel was studied. The mathematical problem was formulated based on the complete equations of motion and natural boundary conditions on a free surface; the problem was solved by the finite-difference method. For shock-capturing, the Schwedoff–Bingham rheological equation was regularized. A parametric study of the flow characteristics and behavior of the free boundary was performed depending on the main parameters of the problem. The characteristic flow structures were demonstrated depending on the ratio of viscous, gravitational, and plastic forces in the flow.     

Studies on spinel cobaltites,MCo2O4 (M = Mn,Zn, Fe,Ni and Co) and their functional properties

Optimization of electrodes for charge storage with appropriate processing conditions places significant challenges in the developments for high performance charge storage devices. In this article, metal cobaltite spinels of formula MCo₂O₄ (where M = Mn, Zn, Fe, Ni and Co) are synthesized by oxalate decomposition method followed by calcination at three typical temperatures, viz. 350, 550, and 750 °C and examined their performance variation when used as anodes in lithium ion batteries. Phase and structure of the materials are studied by powder x-ray diffraction (XRD) technique. Single phase MnCo2O4,ZnCo2O4 and Co3O4 are obtained for all different temperatures 350 °C, 550 °C and 750 °C; whereas FeCo₂O₄ and NiCo₂O₄ contained their constituent binary phases even after repeated calcination. Morphologies of the materials are studied via scanning electron microscopy (SEM): needle-shaped particles of MnCo₂O₄ and ZnCo₂O₄, submicron sized particles of FeCo₂O₄ and agglomerated submicron particle of NiCo₂O₄ are observed. Galvanostatic cycling has been conducted in the voltage range 0.005–3.0 V vs. Li at a current density of 60 mA g^?1 up to 50 cycles to study their Li storage capabilities. Highest observed charge capacities are: MnCo₂O₄ – 365 mA h g^?1 (750 °C); ZnCo₂O₄ – 516 mA h g^?1 (550 °C); FeCo₂O₄ – 480 mA h g^?1 (550 °C); NiCo₂O₄ – 384 mA h g^?1 (750 °C); and Co₃O₄ – 675 mA h g^?1 (350 °C). The Co₃O₄ showed the highest reversible capacity of 675 mA h g^?1; the NiO present in NiCo₂O₄ acts as a buffer layer that results in improved cycling stability; the ZnCo₂O₄ with long needle-like shows good cycling stability.     

FPGA based generic RO TRNG architecture for image confusion

Multimedia Tools and Applications - True Random Number Generator (TRNG) has become a central element of today’s secure communication. TRNGs developed through FPGA implementation have a...     

An empirical approach towards characterization of encrypted and unencrypted VoIP traffic

Multimedia Tools and Applications - VoIP traffic classification plays a major role towards network policy enforcements. Characterization of VoIP media traffic is based on codec behaviour. With the...     

Task-Independent Spiking Central Pattern Generator: A Learning-Based Approach

Neural Processing Letters - Legged locomotion is a challenging task in the field of robotics but a rather simple one in nature. This motivates the use of biological methodologies as solutions to...     

Consistency,availability, and partition tolerance in blockchain: a survey on the consensus mechanism over peer-to-peer networking

Annals of Telecommunications - Blockchain is a disruptive technology that relies on the distributed nature of the peer-to-peer network while performing an agreement, or consensus, a mechanism to...     

A Novel Method for Preparing a Batch of Silicate Glasses Using Sodium and Potassium Hydroxides

A novel method for preparing a batch of silicate glasses containing crystalline quartz, glass formers, modifiers, intermediates, and auxiliary components, including the physicochemical activation of high-melting batch components with the use of alkali metal hydroxides, is developed. The optimal technological parameters are determined and the general scheme for obtaining an agglomerate by the proposed method is presented. It is found that moisturizing the activated components of a glass batch with a KOH solution having a minimal concentration of 0.5% strengthens the agglomerate of the glass batch in comparison with moisturizing by water.     

A Dynamic Inertial Weight Strategy in Micro PSO for Swarm Robots

Wireless Personal Communications - A relatively new area of research and development is Swarm Robotics. It is a part of the swarm intelligence field. In the proposed paper, we shall use swarm...