Collisionless shock acceleration of quasi-monoenergetic ions in ultra-relativistic regime

Collisionless shock acceleration of carbon ions (C$^{6+}$) is investigated in the ultra-relativistic regime of laser-plasma interaction by accounting for the radiation reaction force and the pair production in particle-in-cell simulations. Both radiation reaction force and pair plasma formation tend to slow down the shock velocity, reducing the energy of the accelerated ions, albeit extending the time scales of the acceleration process. Slab plasma target achieves lower energy spread while target with a tailored density profile yields higher ion acceleration energies.Comment: 10 pages,12 figure

Studying the Behaviour of Model of Mirror Neuron System in Case of Autism

Several experiment done by the researchers conducted that autism is caused by the dysfunctional mirror neuron system and the dysfunctions of mirror neuron system is proportional to the symptom severity of autism. In the present work those experiments were studied as well as studying a model of mirror neuron system called MNS2 developed by a research group. This research examined the behavior of the model in case of autism and compared the result with those studies conducting dysfunctions of mirror neuron system in autism. To perform this, a neural network employing the model was developed which recognized the three types of grasping (faster, normal and slower). The network was implemented with back propagation through time learning algorithm. The whole grasping process was divided into 30 time steps and different hand and object states at each time step was used as the input of the network. Normally the network successfully recognized all of the three types of grasps. The network required more times as the number of inactive neurons increased. And in case of maximum inactive neurons of the mirror neuron system the network became unable to recognize the types of grasp. As the time to recognize the types of grasp is proportional to the number of inactive neurons, the experiment result supports the hypothesis that dysfunctions of MNS is proportional to the symptom severity of autism

South-South FDI vs North-South FDI : A Comparative Analysis in the Context of India

Over the years FDI activities from developing countries have grown very rapidly and most of these investments end up in other developing countries. Such FDI flows are formally known as South-South FDI. This paper attempts to compare the characteristics of South-South FDI versus North-South FDI in the context of India. The analysis is carried at two levels. First we look at the overall trends of FDI flows (both inward & outward) region wise (North versus South), country wise and sector wise. Our results confirm that Indias FDI activities have broadly been consistent with the well known concept of Investment Development Path (Dunning, 1981). We also find that while country profiles have undergone changes, there has been no significant shift in the sectoral profile. Next we carry out econometric analysis at the sectoral /industry level for inward FDI from the North and from the South to examine the difference in the characters (if any) of FDI from the two sources. Our broad conclusion is that although there is not much difference between FDI from the north and from the south (both being concentrated in sectors with larger markets, higher export orientation & lower import intensity) southern FDIs appear to flow more into growing sectors while FDI from north do not have such indication. Ultimately however, it is at the firm level where one needs to identify the factors inhibit/attract FDI. The qualitative findings from a limited survey of 93 firms are presented in the appendix.FDI inflows and outflows, North-South FDI, South-South FDI

Non-Cooperative Rational Interactive Proofs

Interactive-proof games model the scenario where an honest party interacts with powerful but strategic provers, to elicit from them the correct answer to a computational question. Interactive proofs are increasingly used as a framework to design protocols for computation outsourcing. Existing interactive-proof games largely fall into two categories: either as games of cooperation such as multi-prover interactive proofs and cooperative rational proofs, where the provers work together as a team; or as games of conflict such as refereed games, where the provers directly compete with each other in a zero-sum game. Neither of these extremes truly capture the strategic nature of service providers in outsourcing applications. How to design and analyze non-cooperative interactive proofs is an important open problem. In this paper, we introduce a mechanism-design approach to define a multi-prover interactive-proof model in which the provers are rational and non-cooperative - they act to maximize their expected utility given others\u27 strategies. We define a strong notion of backwards induction as our solution concept to analyze the resulting extensive-form game with imperfect information. We fully characterize the complexity of our proof system under different utility gap guarantees. (At a high level, a utility gap of u means that the protocol is robust against provers that may not care about a utility loss of 1/u.) We show, for example, that the power of non-cooperative rational interactive proofs with a polynomial utility gap is exactly equal to the complexity class P^{NEXP}