Social capital at work How family, friends and civic ties relate to labour market outcomes

This paper investigates the extent to which an individual's 'stock' of social capital relates to labour force outcomes, over and above more well established determinants. In particular, it examines how family and kinship networks, friends and neighbours relate to individual labour market outcomes, compared with the role of civic ties and institutional networks. Using data collected from a national random sample of 1500 Australians, the paper investigates the relative impact of trust, bonding, bridging and linking relationships upon labour force status and successful job search method.

Tensor extension of the Poincar\'e algebra

A tensor extension of the Poincar\'e algebra is proposed for the arbitrary dimensions. Casimir operators of the extension are constructed. A possible supersymmetric generalization of this extension is also found in the dimensions $D=2,3,4$.Comment: 1+7 pages, LaTe

Decoherence and Dissipation in Quantum Two-State Systems

The Brownian dynamics of the density operator for a quantum system interacting with a classical heat bath is described using a stochastic, non-linear Liouville equation obtained from a variational principle. The environment's degrees of freedom are simulated by classical harmonic oscillators, while the dynamical variables of the quantum system are two non-hermitian "square root operators" defined by a Gauss-like decomposition of the density operator. The rate of the noise-induced transitions is expressed as a function of the environmental spectral density, and is discussed for the case of the white noise and blackbody radiation. The result is compared with the rate determined by a quantum environment, calculated by partial tracing in the whole Hilbert space. The time-dependence of the von Neumann entropy and of the dissipated energy is obtained numerically for a system of two quantum states. These are the ground and first excited state of the center of mass vibrations for an ion confined in a harmonic trap.Comment: 17 pages, LaTex, 3 postscript figures; replaced to correct typo in Eq. (5

Microstates of Non-supersymmetric Black Holes

A five-dimensional dyonic black hole in Type-I theory is considered that is extremal but non-supersymmetric. It is shown that the Bekenstein-Hawking entropy of this black hole counts precisely the microstates of a D-brane configuration with the same charges and mass, even though there is no apparent supersymmetric nonrenormalization theorem for the mass. A similar result is known for the entropy at the stretched horizon of electrically charged, extremal, but non-supersymmetric black holes in heterotic string theory. It is argued that classical nonrenormalization of the mass may partially explain this result.Comment: 11 pages, harvmac, a paragraph about classical non-renormalization in asymptotically flat co-ordinates and references adde

Scaling of human behavior during portal browsing

We investigate transitions of portals users between different subpages. A weighted network of portals subpages is reconstructed where edge weights are numbers of corresponding transitions. Distributions of link weights and node strengths follow power laws over several decades. Node strength increases faster than linearly with node degree. The distribution of time spent by the user at one subpage decays as power law with exponent around 1.3. Distribution of numbers P(z) of unique subpages during one visit is exponential. We find a square root dependence between the average z and the total number of transitions n during a single visit. Individual path of portal user resembles of self-attracting walk on the weighted network. Analytical model is developed to recover in part the collected data.Comment: 6 pages, 7 figure

Physiological profile and activity pattern of minor Gaelic football players

The purpose of this study was to evaluate the physiological profile and activity pattern in club- and county-level under-18 (U-18) Gaelic football players relative to playing position. Participants (n = 85) were analyzed during 17 official 15-a-side matches using global positioning system technology (SPI Pro X II; GPSports Systems, Canberra, Australia) and heart rate (HR) telemetry. During the second part of this study, 63 participants underwent an incremental treadmill test to assess their maximal oxygen uptake (V_ o2max) and peak HR (HRmax). Players covered a mean distance of 5,774 6 737 m during a full 60-minute match. The mean %HRmax and %V_ O2max observed during the match play were 81.6 6 4.3% and 70.1 6 7.75%, respectively. The playing level had no effect on the distance covered, player movement patterns, or %HRmax observed during match play. Midfield players covered significantly greater distance than defenders (p = 0.033). Playing position had no effect on %HRmax or the frequency of sprinting or high-intensity running during match play. The frequency of jogging, cruise running, striding (p = 0.000), and walking (p = 0.003) was greater in the midfield position than in the forward position. Time had a significant effect (F(1,39) = 33.512, p-value = 0.000, and h2 Ρ = 0.462) on distance covered and %HRmax, both of which showed a reduction between playing periods. Gaelic football is predominantly characterized by low-to-moderate intensity activity interspersed with periods of high-intensity running. The information provided may be used as a framework for coaches in the design and prescription of training strategies. Positional specific training may be warranted given the comparatively greater demands observed in the midfield playing position. Replicating the demands of match play in training may reduce the decline in distance covered and % HRmax observed during the second half of match play

Non-trivial scaling of self-phase modulation and three-photon absorption in III-V photonic crystal waveguides

We investigate the nonlinear response of photonic crystal waveguides with suppressed two-photon absorption. A moderate decrease of the group velocity (~ c/6 to c/15, a factor of 2.5) results in a dramatic (30x) enhancement of three-photon absorption well beyond the expected scaling, proportional to 1/(vg)^3. This non-trivial scaling of the effective nonlinear coefficients results from pulse compression, which further enhances the optical field beyond that of purely slow-group velocity interactions. These observations are enabled in mm-long slow-light photonic crystal waveguides owing to the strong anomalous group-velocity dispersion and positive chirp. Our numerical physical model matches measurements remarkably.Comment: 10 pages, 4 figure

Letter, 1950 April 21, from Langston Huges to Eva Jessye

1 page, Huges wrote Jessye a small poem

Global Regulation and Labour Strategy: The Case of International Labour Standards

Internationalisation of capital grew rapidly in the post-war period, driven initially by US-based TNCs. International capitals were able to trade off production conditions in different economies against national regimes of regulation. Consequently, these regimes were increasingly subject to amendment in order to attract mobile investment. Such changes were particularly significant for local and national labour movements. Growing mobility of capital undermined the organisational and locational specificity of labour. Labour's response was to seek to internationalise collective bargaining in an attempt to impose a measure of international regulation on international capital. This response, first theorised in the 1960s, has generally failed. However, with the growth of international regulation of capital in recent years -for example, the WTO, proposed measures to control international investment, international production standards, the creation of powerful economic blocs prepared to place labour standards on the agenda (NAFTA, EU, APEC) - the possibility has arisen for labour to take advantage of international regulatory developments to press for the international imposition of core Labour standards. Initiatives taken by the ICFTU-APRO in the Asian/South Pacific region illustrate this development. However, given the nature of contemporary international regulation, labour strategies in this area are not guaranteed success

Strings in a Space with Tensor Central Charge Coordinates

New string models in D=4 space-time extended by tensor central charge coordinates $z_{mn}$ are constructed. We use the $z_{mn}$ coordinates to generate string tension using a minimally extended string action linear in $dz^{mn}$. It is shown that the presence of $z_{mn}$ lifts the light-like character of the tensionless string worldsheet and the degeneracy of its induced metric. We analyse the equations of motion and find a solution of the string equations in the generalized D=(4+6)-dimensional space $X^{\cal M}=(x^{m},z^{mn})$ with $z_{mn}$ describing a spin wave process. A supersymmetric version of the proposed model is formulated.Comment: 10 pages, Latex, style file espcrc2.sty. Talk given by AZ at the D.V. Volkov Memorial Conference ``Supersymmetry and Quantum Field Theory'', July 25-30, 2000, Kharkov, to be published in the Nuclear Physics B Conference Supplement