Banded spatiotemporal chaos in sheared nematogenic fluids

We present the results of a numerical study of a model of the hydrodynamics of a sheared nematogenic fluid, taking into account the effects of order parameter stresses on the velocity profile, but allowing spatial variations only in the gradient direction. When parameter values are such that the stress from orientational distortions is comparable to the bare viscous stress, the system exhibits steady states with the characteristics of shear banding. In addition, nonlinearity in the coupling of extensional flow to orientation leads to the appearance of a new steady state in which the features of both spatiotemporal chaos and shear banding are present.Comment: 4 pages, 6 figures.(Some of the figures have low resolution so as to fit the requirements of arxiv.

Site-Specific Colloidal Crystal Nucleation by Template-enhanced Particle Transport

The monomer surface mobility is the single most important parameter that decides the nucleation density and morphology of islands during thin film growth. During template-assisted surface growth in particular, low surface mobilities can prevent monomers from reaching target sites and this results in a partial to complete loss of nucleation control. While in atomic systems a broad range of surface mobilities can be readily accessed, for colloids, owing to their large size, this window is substantially narrow and therefore imposes severe restrictions in extending template-assisted growth techniques to steer their self-assembly. Here, we circumvented this fundamental limitation by designing templates with spatially varying feature sizes, in this case moire patterns, which in the presence of short-range depletion attraction presented surface energy gradients for the diffusing colloids. The templates serve a dual purpose, first, directing the particles to target sites by enhancing their surface mean free paths and second, dictating the size and symmetry of the growing crystallites. Using optical microscopy, we directly followed the nucleation and growth kinetics of colloidal islands on these surfaces at the single-particle level. We demonstrate nucleation control, with high fidelity, in a regime that has remained unaccessed in theoretical, numerical and experimental studies on atoms and molecules as well. Our findings pave the way for fabricating non-trivial surface architectures composed of complex colloids and nanoparticles.Comment: 12 pages, 3 figure

Predatory Value: Economies of Dispossession and Disturbed Relationalities

This essay introduces and theorizes the central concerns of this special issue, “Economies of Dispossession: Indigeneity, Race, Capitalism.” Financialization, debt, and the accelerated concentration of wealth today work through social relations already configured and disposed by imperial conquest and racial capitalism. In the Americas broadly and the United States specifically, colonization and transatlantic slavery set in motion the dynamics and differential racialized valuations that continue to underwrite particular forms of subjection, property, commerce, and territoriality. The conception of economies of dispossession introduced in this essay draws attention to the overriding importance of rationalities of abstraction and commensurability for racial capitalism. The essay problematizes the ways in which dispossession is conventionally treated as a self-evident and circumscribed practice of unjust taking and subtractive action. Instead, working across the lethal confluences of imperial conquest and racial capitalist predation, this essay critically situates the logic of propriation that organizes and underwrites predatory value in the historical present. Against the commensurabilities and rationalities of debt and finance capitalism, conditioned through the proprietary logics of settler colonialism and racial capitalism, the essay gestures toward alternative frameworks for building collective capacities for what the authors describe as a grounded relationality

OBGP based QoS analysis for optical virtual private network connection setup

In a computer network, clients work with different applications; hence there are requirement of speed, bandwidth, delay etc. The parameters are called as Quality of Service (QoS) parameters. QoS guarantees the performance in a network. To meet the growing demand of Optical Virtual Private Network (OVPN), the Internet Service Providers (ISP) should use multiple techniques which ensure the Quality of Service. For performing data communication between nodes in a network the path to be followed should be known. In this project, BGP/OBGP protocols have been discussed and using this protocol, paths have been found between routers. Then the optimal path is found out based on the path attributes. Also the paths are examined for QoS parameters and the best path is chosen. An OVPN model has been discussed and modified for performing Routing & Wavelength Assignment (RWA) function based on QoS requirement which is expressed in terms of Q-factor and trying to achieve minimum blocking probability of path. The objective of this project is to assign best connection between nodes as per the request from clients operating with various applications

A STUDY OF CONSUMER BEHAVIOUR TOWARDS ONLINE SHOPPING WITH SPECIAL REFERENCE TO BANGALORE CITY, KARNATAKA INDIA.

Electronic commerce, commonly known as e-commerce, refers to the buying and selling of products or services over electronic systems such as the internet and other computer networks. Internet is the rapidest growing media during the past decade. It has changed the look of new era. Especially, online shopping is a rapidly growing e- commerce area. Online stores are usually available 24 hours a day, and many consumers have internet access both at work and at home. A successful web store is not just a good looking website with dynamic technical features, listed in many search engines but it always looks forward for consumer satisfaction. This study aims to establish a preliminary assessment, evaluation and understanding of the characteristics of online shopping. An effort has been made to investigate online consumer behaviour, which in turn provides E-marketers with a constructional framework for fine-tuning their E-businesses? strategies

Equilibrium glassy phase in a polydisperse hard sphere system

The phase diagram of a polydisperse hard sphere system is examined by numerical minimization of a discretized form of the Ramakrishnan-Yussouff free energy functional. Crystalline and glassy local minima of the free energy are located and the phase diagram in the density-polydispersity plane is mapped out by comparing the free energies of different local minima. The crystalline phase disappears and the glass becomes the equilibrium phase beyond a "terminal" value of the polydispersity. A crystal to glass transition is also observed as the density is increased at high polydispersity. The phase diagram obtained in our study is qualitatively similar to that of hard spheres in a quenched random potential.Comment: 4 pages, 4 figure