Optimal Tc_c of cuprates: role of screening and reservoir layers

We explore the role of charge reservoir layers (CRLs) on the superconducting transition temperature of cuprate superconductors. Specifically, we study the effect of CRLs with efficient short distance dielectric screening coupled capacitively to copper oxide metallic layers. We argue that dielectric screening at short distances and at frequencies of the order of the superconducting gap, but small compared to the Fermi energy can significantly enhance T$_c$, the transition temperature of an unconventional superconductor. We discuss the relevance of our qualitative arguments to a broader class of unconventional superconductors.Comment: 8 Pages, 4 figure

It’s Not All About the Music: User Preference for Musicians on Facebook

To better understand hedonic utility of social media users, we conducted a study among university students using musicians’ Facebook pages for digital content consumption. Our study measures the effects of peer influence and media richness as subjects evaluated different musician’s pages with different levels of both effects. The results show support for our key hypothesis that social media users are influenced by peer influence in making choices to “like” something. More importantly, the key aspects of the product (in our case, music) were less of a predictor of consumer choice

Product Portfolio and Mobile Apps Success: Evidence from App Store Market

This research empirically analyzes seller’s product portfolio strategy in the mobile application (apps) market. We use crosssectionaldata on the most downloaded application rankings in the Apple App Store to examine the impact of app portfoliostrategy on sales performance. We find that app portfolio diversification is positively correlated with sales performance. Wealso find that sellers who offer a combination of free and paid apps have higher sales performance than those who deliverpaid apps only. Furthermore, the results show that sellers with scale advantages compete differently from sellers in the longtail. These findings have implications for theorizing about product portfolio management in the emerging mobile app storemarkets

Market Reactions to Intellectual Property Infringement Litigations in the Information Technology Industry

The information technology industry is characterized by constant innovation and substantial expenditures on research and development. Firms attempt to protect their investment in research and development and retain a competitive edge in the industry by obtaining patents and copyrights. These intellectual properties are important intangible assets that are evaluated by the financial markets and can be observed in the market price at which the common stock is traded. If a firm announces a lawsuit claiming that its intellectual property has been violated, the markets have to form an opinion about several matters, viz. the merit of the lawsuit, the probability of a verdict favoring either party, the damages which will be awarded, if any, and managerial time and effort expended in the process. We are unable to observe these inputs, but can measure the impact of these factors on the stock price

AN ANALYSIS TO URBAN TRANSPORT PROBLEMS AND CHALLENGES IN INDIA

Cities and towns play an energetic role in promoting economic growth and wealth. Although less than a third of India's people live in cities and towns, these regions generate more than two-thirds of the country's 90% of the income and revenue of the government. In the years to come, as India becomes more and more urbanised, urban areas will play an important role in maintaining a high rate of economic growth. But, the pace of economic growth can be maintained if and only if cities function efficiently – that their resources are used to maximize the contribution of cities to national income. urban efficiency to a huge extent Much be contingent on the effectiveness of transportation systems, that is, the efficacy with which people and goods are moved throughout the city. Poor transportation systems impede economic growth and development, and the net effect can be loss of competitiveness in both domestic as well as international markets. Although vehicle proprietorship rates, the number of vehicles per capita, in Indian cities are lesser than their counterparts in developed countries, they suffer from worse congestion, delays, pollution and accidents than cities. industrial world. This paper provides an impression of the issues and challenges of urban transport in India. This paper first reviews leanings in vehicular development and availability of transport infrastructure in Indian cities. This is followed by an argument on the nature and greatness of urban transport problems such as overcrowding, effluence and road accidents. build on Background The paper proposes policy measures to improve urban transport in India

Majorana zero modes in a quantum Ising chain with longer-ranged interactions

A one-dimensional Ising model in a transverse field can be mapped onto a system of spinless fermions with p-wave superconductivity. In the weak-coupling BCS regime, it exhibits a zero energy Majorana mode at each end of the chain. Here, we consider a variation of the model, which represents a superconductor with longer ranged kinetic energy and pairing amplitudes, as is likely to occur in more realistic systems. It possesses a richer zero temperature phase diagram and has several quantum phase transitions. From an exact solution of the model these phases can be classified according to the number of Majorana zero modes of an open chain: 0, 1, or 2 at each end. The model posseses a multicritical point where phases with 0, 1, and 2 Majorana end modes meet. The number of Majorana modes at each end of the chain is identical to the topological winding number of the Anderson's pseudospin vector that describes the BCS Hamiltonian. The topological classification of the phases requires a unitary time-reversal symmetry to be present. When this symmetry is broken, only the number of Majorana end modes modulo 2 can be used to distinguish two phases. In one of the regimes, the wave functions of the two phase shifted Majorana zero modes decays exponentially in space but but in an oscillatory manner. The wavelength of oscillation is identical to the asymptotic connected spin-spin correlation of the XY-model in a transverse field to which our model is dual.Comment: 11 pages, 8 figures; brief clarifying comments added; few new references; this version is accepted in Phys. Rev.

Heads or Tails? Network Effects on Game Purchase Behavior in The Long Tail Market

This study aims to uncover the effects of network effects, namely the social influence and network externalities, on purchasing of digital goods. We are particularly interested in the differences in network effects in long tail versus the head of the market. We used a novel dataset from an online game distribution platform covering 1975 games and 8000 users in this study. The results reveal that network effects are more pronounced for the tail of the market in comparison to the head of the market. For the games that are in the head of the market the popularity may be more significantly influenced by factors unobserved in this study (such as advertising budget) yet the games in the tail benefited greatly from any change to the network effects. The exception was social games. The games that relied on user to user engagement did not fare well in the tail of the market. This study contributes to the literature on network effects and long tail market literature by highlighting the differential effects in different segments of the market