Parameter dependence of phase and log amplitude scintillation

Parameter dependence of phase and log amplitude scintillation - Signal statistics of spherical wave emitted by transmitter through intervening slab of irregularitie

RMD-QOSM: The NSIS Quality-of-Service Model for Resource Management in Diffserv

This document describes a Next Steps in Signaling (NSIS) Quality-of- Service (QoS) Model for networks that use the Resource Management in Diffserv (RMD) concept. RMD is a technique for adding admission control and preemption function to Differentiated Services (Diffserv) networks. The RMD QoS Model allows devices external to the RMD network to signal reservation requests to Edge nodes in the RMD network. The RMD Ingress Edge nodes classify the incoming flows into traffic classes and signals resource requests for the corresponding traffic class along the data path to the Egress Edge nodes for each flow. Egress nodes reconstitute the original requests and continue forwarding them along the data path towards the final destination. In addition, RMD defines notification functions to indicate overload situations within the domain to the Edge nodes

Interaction of laser-cooled 87^{87}Rb atoms with higher order modes of an optical nanofiber

Optical nanofibres are used to confine light to subwavelength regions and are very promising tools for the development of optical fibre-based quantum networks using cold, neutral atoms. To date, experimental studies on atoms near nanofibres have focussed on fundamental fibre mode interactions. In this work, we demonstrate the integration of a few-mode optical nanofibre into a magneto-optical trap for $^{87}$Rb atoms. The nanofibre, with a waist diameter of $\sim$700 nm, supports both the fundamental and first group of higher order modes and is used for atomic fluorescence and absorption studies. In general, light propagating in higher order fibre modes has a greater evanescent field extension around the waist in comparison with the fundamental mode. By exploiting this behaviour, we demonstrate that the detected signal of fluorescent photons emitted from a cloud of cold atoms centred at the nanofibre waist is larger ($\sim$6 times) when higher order guided modes are considered as compared to the fundamental mode. Absorption of on-resonance, higher order mode probe light by the laser-cooled atoms is also observed. These advances should facilitate the realisation of atom trapping schemes based on higher order mode interference.Comment: 11 pages, 8 figure

The Resilience of Traditional Trade Union Practices in the Revitalisation of the Argentine Labour Movement

Market reforms have posed similar challenges to trade unions worldwide. In this regard, the current situation in Argentina does not differ from the global trend. De-industrialisation, de-centralisation of collective bargaining, reduction of the formal sector, flexibility in the labour market and the use of labour power have all affected trade unions’ capacity to mobilise workers and play a major progressive role in society. In addition, particularly over the last decade, the effects of thirty years of economic liberalisation combined with an explosion in the rate of unemployment has led to mass poverty and enormous class divisions, changing the landscape of social mobilisation in Argentina. On the one hand, mass unemployment disciplined wage-labourers; on the other, new territorial organisations, mainly of those workers now unemployed – the so-called piqueteros (for picket) – have proliferated and sustained the virulent social protests for employment and social programmes which characterised the country at the turn of the century. In this context, scholars have tended to assume the definitive demise of trade unions and their methods of struggle, turning their attention to the new social movements.Facultad de Humanidades y Ciencias de la Educació

The Resilience of Traditional Trade Union Practices in the Revitalisation of the Argentine Labour Movement

Market reforms have posed similar challenges to trade unions worldwide. In this regard, the current situation in Argentina does not differ from the global trend. De-industrialisation, de-centralisation of collective bargaining, reduction of the formal sector, flexibility in the labour market and the use of labour power have all affected trade unions’ capacity to mobilise workers and play a major progressive role in society. In addition, particularly over the last decade, the effects of thirty years of economic liberalisation combined with an explosion in the rate of unemployment has led to mass poverty and enormous class divisions, changing the landscape of social mobilisation in Argentina. On the one hand, mass unemployment disciplined wage-labourers; on the other, new territorial organisations, mainly of those workers now unemployed – the so-called piqueteros (for picket) – have proliferated and sustained the virulent social protests for employment and social programmes which characterised the country at the turn of the century. In this context, scholars have tended to assume the definitive demise of trade unions and their methods of struggle, turning their attention to the new social movements.Facultad de Humanidades y Ciencias de la Educació

Labour movement in Argentina since 1945 : The limits of trade union reformism

Events at the end of World War II were pivotal for the future of the Argentine labour movement. The military government that took power in 1943, headed by Colonel Juan Domingo Perón, was intent on renewing the process of industrialisation initiated in the 1930s and at the same time halting the spread of communism among the working class. Perón was able to build upon his friendly relations with trade union leaders, creating a durable alliance that would shape the contours of the labour movement and labour relations for decades. Industrialisation in the 1930s had greatly expanded the working class and the trade unions. The 1930s had also created widespread working-class discontent, and with the end of the war approaching, Perón and the military foresaw the coming of a dangerous period of revolutionary turmoil. Through his office of the Secretaría de Trabajo y Previsión, Perón shaped policies to stymie communism through both repression and concessions to appease workers’ political and economic concerns. This ambiguous and reformist set of policies gradually became a grand political project, in which trade unions were to play an integral, two-faceted role as partners in industrial expansion and the backbone of an emergent national political movement.Facultad de Humanidades y Ciencias de la Educació