Anisotropic Dependence of Giant Magneto-Impedance of Amorphous Ferromagnetic Ribbon on Biasing Field

The magneto-impedance (MI) in amorphous ribbon of nominal composition Fe73.5Nb3Cu1Si13.5B9 has been measured at 1MHz and at room temperature for different configurations of exciting a.c and biasing d.c. fields. A large drop in both resistance and reactance is observed as a function of d.c magnetic field. When the d.c and a.c fields are parallel but normal to the axis of ribbon, smaller magnetic field is needed to reduce the impedance to its small saturated value compared to the situation when fields are along the axis of ribbon. Larger d.c. field is required to lower the impedance when the d.c field acts perpendicular to the plane of the ribbon. Such anisotropy in magneto-impedance is related to the anisotropic response of the magnetization of ribbon. The large change of impedance is attributed to large variation of a.c permeability on the direction and magnitude of the dc biasing field.Comment: 12 pages, 7 figures, to be published in "International Journal of Modern Physics B

Confinement induced instability of thin elastic film

A confined incompressible elastic film does not deform uniformly when subjected to adhesive interfacial stresses but with undulations which have a characteristic wavelength scaling linearly with the thickness of the film. In the classical peel geometry, undulations appear along the contact line below a critical film thickness or below a critical curvature of the plate. Perturbation analysis of the stress equilibrium equations shows that for a critically confined film the total excess energy indeed attains a minima for a finite amplitude of the perturbations which grow with further increase in the confinement.Comment: 11 pages, 6 figure

Motivating knowledge agents : can incentive pay overcome social distance?

This paper studies the interaction of incentive pay and social distance in the dissemination of information. We analyse theoretically as well as empirically the e ect of incentive pay when agents have pro-social objectives, but also preferences over dealing with one social group relative to another. In a randomised eld experiment undertaken across 151 villages in South India, local agents were hired to spread information about a public health insurance programme. Relative to at pay, incentive pay improves knowledge transmission to households that are socially distant from the agent, but not to households similar to the agent

IMPLEMENTING HEALTH INSURANCE FOR THE POOR: THE ROLLOUT OF RSBY IN KARNATAKA

The National Health Insurance Scheme (Rashtriya Swasthya Bima Yojana, RSBY) aims to improve poor people's access to quality health care in India. This paper looks at the implementation of the scheme in Karnataka, drawing on a large survey of eligible households and interviews with empanelled hospitals in the state. Six months after initiation, an impressive 85% of eligible households in the sample were aware of the scheme, and 68% had been enrolled. However, the scheme was hardly operational and utilisation was virtually zero. A large proportion of beneficiaries were yet to receive their cards, and many did not know how and where to obtain treatment under the scheme. Moreover, hospitals were not ready to treat RSBY patients. Surveyed hospitals complained of a lack of training and delays in the reimbursement of their expenses. Many were refusing to treat patients under the scheme until the issues were resolved, and others were asking cardholders to pay cash. As is typical for the implementation of a government scheme, many of the problems discussed can be related to a misalignment of incentives.

Exploiting entanglement in communication channels with correlated noise

We develop a model for a noisy communication channel in which the noise affecting consecutive transmissions is correlated. This model is motivated by fluctuating birefringence of fiber optic links. We analyze the role of entanglement of the input states in optimizing the classical capacity of such a channel. Assuming a general form of an ensemble for two consecutive transmissions, we derive tight bounds on the classical channel capacity depending on whether the input states used for communication are separable or entangled across different temporal slots. This result demonstrates that by an appropriate choice, the channel capacity may be notably enhanced by exploiting entanglement.Comment: 9 pages, 5 figure

Selective amplification of scars in a chaotic optical fiber

In this letter we propose an original mechanism to select scar modes through coherent gain amplification in a multimode D-shaped fiber. More precisely, we numerically demonstrate how scar modes can be amplified by positioning a gain region in the vicinity of specific points of a short periodic orbit known to give rise to scar modes