Statistics of spinons in the spin-liquid phase of Cs2CuCl4

Motivated by a recent experiment on Cs2CuCl4, we study the spin dynamics of the spin-liquid phase of the spin-1/2 frustrated Heisenberg antiferromagnet on the anisotropic triangular lattice. There have been two different proposals for the spin-liquid phase of Cs2CuCl4. These spin-liquid states support different statistics of spinons; the bosonic Sp(N) large-N mean field theory predicts bosonic spinons while the SU(2) slave-boson mean field theory leads to fermionic spinons. We compute the dynamical spin structure factor for both types of spin-liquid state at zero and finite temperatures. While at zero temperature both theories agree with experiment on a qualitative level, they show substantial differences in the temperature dependence of the dynamical spin structure factor.Comment: 4 pages, including 4 figure

Consumer Perception of Boutique Hotel: A Pilot Study

In most situations, consumers purchase or use built-in products and services; however, it is sometimes necessary to customize products to satisfy consumers’ needs and desires. In the hotel industry, for instance, customers have begun to prefer unique experiences. The newest concept in the hotel market today is the boutique (Hartesvelt, 2006). Boutique hotels are upscale, luxury properties that tend to be smaller than conventional hotels, are frequently located in urban areas or city centers, have historical or other interesting aspects, and individually designed for the delivery of personal service (Lim & Endean, 2008). The primary purpose of this study is to identify a profile of hotel consumers with higher awareness of and more positive attitudes toward boutique hotels. Further, this study is to elaborate on marketing strategies that arise from an improved understanding of the profile of this segment of hotel consumers

What can we do to Attract and Retain Young People to our Company as we Find it Difficult to Attract Employees at all Levels?

Question: As the workforce ages we are finding it a challenge to recruit new employees at all levels. So our question involves what can we do to attract and retain young people to our company? We have some insight into how to attract employees but where we would like your help is how to design our work and career paths to maintain the employees

Cooperative Transmission for a Vector Gaussian Parallel Relay Network

In this paper, we consider a parallel relay network where two relays cooperatively help a source transmit to a destination. We assume the source and the destination nodes are equipped with multiple antennas. Three basic schemes and their achievable rates are studied: Decode-and-Forward (DF), Amplify-and-Forward (AF), and Compress-and-Forward (CF). For the DF scheme, the source transmits two private signals, one for each relay, where dirty paper coding (DPC) is used between the two private streams, and a common signal for both relays. The relays make efficient use of the common information to introduce a proper amount of correlation in the transmission to the destination. We show that the DF scheme achieves the capacity under certain conditions. We also show that the CF scheme is asymptotically optimal in the high relay power limit, regardless of channel ranks. It turns out that the AF scheme also achieves the asymptotic optimality but only when the relays-to-destination channel is full rank. The relative advantages of the three schemes are discussed with numerical results.Comment: 35 pages, 10 figures, submitted to IEEE Transactions on Information Theor

Understanding Wage Inequality - Trade, Technology, and Location

This paper investigates the trend of the wage inequality and the metropolitan wage premium in the United States during the 1980s. Two distinct sets of literature documented that the wage inequality between skilled and unskilled workers and the metropolitan wage premium have risen significantly during the decade. When we combine these two sets of evidence and consider the interaction between skill and location, however, the increasing trends of the skill wage gap and the metropolitan wage premium almost disappear. Most of the dynamic changes are picked up by the interaction term, an extra metropolitan wage premium for skill, which rises significantly over the decade. As a partial explanation we find an increasing trend of the skill wage inequality across industries and occupations within metropolitan areas relative to non-metropolitan areas. This finding suggests that the skill biased technology alone may not sufficiently explain the growing wage inequality and it can be interpreted as a metropolitan specific phenomenon to an extent.Wage inequality, Skill premium, Metropolitan areas, globalization

Using panel data to exactly estimate under-reporting by the self-employed

The income of the self-employed is often assumed to be understated in economic statistics. Debate exists about the extent of under-reporting and the resulting measures of the size of the underground economy. This paper refines a method developed by Pissarides and Weber (1989) and uses discrepancies between food shares and reported incomes to estimate under-reporting by the self-employed. In contrast to previous studies our panel data methodology distinguishes income under-reporting from transitory income fluctuations of the self-employed, and provides an exact estimate of the degree of under-reporting rather than just an interval estimate. Using panel data from Korea and Russia we estimate that 38 percent of the income of self-employed households in Korea and 47 percent of the income of Russian self-employed households is not reported