New methods for fitting multiple sinusoids from irregularly sampled data

A novel framework is proposed for the estimation of multiple sinusoids from irregularly sampled time series. This spectral analysis problem is addressed as an under-determined inverse problem, where the spectrum is discretized on an arbitrarily thin frequency grid. As we focus on line spectra estimation, the solution must be sparse, i.e. the amplitude of the spectrum must be zero almost everywhere. Such prior information is taken into account within the Bayesian framework. Two models are used to account for the prior sparseness of the solution, namely a Laplace prior and a Bernoulli–Gaussian prior, associated to optimization and stochastic sampling algorithms, respectively. Such approaches are efficient alternatives to usual sequential prewhitening methods, especially in case of strong sampling aliases perturbating the Fourier spectrum. Both methods should be intensively tested on real data sets by physicists.     

国内外阅读障碍研究对比分析与国内研究前景展望

阅读障碍亦称诵读障碍或拼写障碍,是一种与脑部相关的学习障碍。阅读障碍研究集心理语言学、心理学、认知科学、医学等诸多学科于一体,是近年来国内外学术界的研究热点之一。梳理国内外阅读障碍的研究团队发展状况,分析国内外阅读障碍研究在诊断、表征、成因以及干预四个方面的异同,探讨国内阅读障碍研究的发展前景,对促进本领域的深入研究大有裨益。     

Interwoven migration narratives: identity and social representations in the Lusophone world

This article provides an exploratory analysis of the life narratives of migrants in the Portuguese-speaking world. By interweaving the life experiences of eight participants in three thematic clusters – ‘shared past’, language and sense of community – we propose a critique of the deep-seated idea of the Lusophone space as a community constructed by the harmonious conviviality of different countries and people. Drawing on contributions from cultural studies, social psychology, anthropology and sociology, we first aim to give voice to the human subjects who embark on migrations and then to understand how the engendered process of identity construction is framed by their social world, simultaneously reframing it. Thus, we aim at shedding light on the ways in which aspects of the political discourses on Lusophony are used (and are instrumental) to the migrants’ identity narrative (re)construction.     

Communication and representation of risk in health crises: the influence of framing and group identity / Comunicación en crisis sanitarias y representación del riesgo. La influencia del framing y la identidad grupal

Based on the Social Representations Theory (SRT) applied to the social construction of risk and the role played by group identities, this study examines the construction of risk created by the mass media in health epidemics. An experimental design with split-ballot questionnaire and 319 participants was used in which message framing (human interest vs. attribution of responsibility) and proximity (high vs. low) were manipulated for a high invulnerability identity (youth) vs. a low invulnerability identity (elderly) population. Results showed that the human interest framing increased the perception of risk, especially when the proximity of the epidemic was high; this effect was explained by people’s emotional response. Furthermore, youth projected the risk towards ‘the other’ in order to protect their invulnerability identity. Finally, we stress the importance of the SRT on a theoretical and applied level for risk communication in health crises.     

The challenge of creating ‘alternative’ images of ageing: Lessons from a project with older women

This article analyses two participatory projects designed to engage older women in the creation of new imagery of old age. While it was hoped that this imagery would offer an ‘alternative’ to mainstream depictions or indeed offer older women a presence amidst the much noted absence of images of older women, the brief left it open to the professional photographers recruited to the project and to the participants themselves to direct the representations. In recent years, critical gerontologists have repeatedly called for artistic challenges to conventional ways of imaging old age. By working with two groups of older women, the intention was that ‘ordinary’ older women (non-celebrity, non-artist) could be included in that challenge and imagery created which would show the lives of older women honestly. In the case of the two projects described here, professional photographers were enlisted to give visual form to the women's views on ageing and their lives as older women and deliver ‘exhibition quality’ images. Important factors in determining the types of images produced included the artistic style and preferences of the photographers and their respective ages, both of which are explored here. In-depth analysis of some of the images produced shows that while they did not succumb to the usual ‘heroes of ageing’/‘bodily decline’ binary (Featherstone & Hepworth, 2005), they did not escape other dualistic categorisations. The images can be broadly viewed as nostalgic/melancholic or humorously carnivalesque. This finding is evidence of how difficult it is to create ‘alternative’ images of older women which defy established modes of categorisation.     

Behind the ethnic–civic distinction: Public attitudes towards immigrants’ political rights in the Netherlands

Public opinion research has sought to distinguish between ethnic and civic conceptions of citizenship and examined the differential associations of these conceptions with policy preferences in the realm of immigration. What has not been examined empirically is why exactly these conceptions are related to people’s preferences. In two survey studies conducted among national samples of native Dutch we tested the proposition that the endorsement of ethnic citizenship is related to lower acceptance of Muslim immigrant rights (Study 1) and their political participation (Study 2) because of a weaker normative sense of common national belonging and higher adherence to autochthony (primo-occupancy) beliefs. In contrast, the endorsement of civic citizenship was expected to be associated with higher acceptance of Muslim immigrant rights and their political participation because of a stronger sense of common belonging and lower belief in autochthony. The findings of the two studies are similar and in support of these expectations.     

Segregation and protectionism: Institutionalised views of Aboriginal rurality

Rurality is a complex and contested term, with multiple notions and gazes amid calls for theoretical pluralism. In Australia, the spatial categories of ‘remote’, ‘rural’, ‘regional’ and ‘urban’ are applied to places that vary in their distance from an economic and political core and have differing population densities. We argue that natural resources institutions in rural Australia demand an ‘authentic’ performance of Aboriginality that is framed within orthodox and stable constructions of an Indigeneity associated with the remote category. Dominant representations of remote Aboriginal people living on traditional homelands and engaged in ‘traditional’ environmental protection are assumed to hold for all places and transposed when natural resources institutions satisfy compulsory Indigenous engagement. Such institutional requirements for authenticity exclude alternative and multiple Indigenous voices in natural resources management. Rather, Aboriginal people seek engagement across a portfolio of natural resources activities typically found in rural areas (such as mining, grazing, forestry, water allocation planning, and natural resources service delivery and enterprise development), and not just isolated in natural and cultural heritage conservation. This broad participation would more completely match their expressed aspirations and the multiple lived realities of their fluid and networked rural worlds. Using the rural town of Eidsvold in Australia as a case study, we discuss the findings of participant observation and semi-structured interviews with Indigenous people at regional natural resources management meetings and at ‘home’ in Eidsvold. Rather than a generic institutional approach, a place-based approach to understanding the complex ruralities of Aboriginal people is needed.     

以民为本:着力解决事关群众切身利益的突出问题

党要始终代表最广大人民的根本利益 ,既是实践党的宗旨所需要 ,也是深入学习贯彻“三个代表”重要思想的根本要求。为此不仅党的理论、路线、纲领、方针、政策都必须把人民的根本利益作为出发点和归宿 ,更要在各项工作中坚持以民为本的思想 ,着力解决事关广大人民群众切身利益的突出问题 ,要抓准、抓实在和切实抓出成效