bluuebunny/crossref_metadata_2025_split huggingface dataset:
Species delimitation in the Lepraria isidiata-L. santosii group: a population study in the Mediterranean-Macaronesian region
Authors: Tretiach Mauro , Muggia Lucia , Baruffo Laurence 
Published: January 2009

AbstractA thorough chemical, molecular and morphological study has been carried out on a problematic group in the genus Lepraria characterized by lobed, granular thalli with a raised rim and a preference for mosses, rocks and mineral soils in exposed, xeric habitats. The material examined was collected in seven countries of the Mediterranean-Macaronesian region, from chalk, carbonate rocks and derived soils (A-thalli), and from siliceous rocks and derived soils (B-thalli). The results of a phylogenetic analysis based on 93 ITS sequences (29 of which newly obtained) support the identification and the segregation of two taxa at species level, provisionally identified as Lepraria isidiata s. lat., (most of the A-thalli), and L. santosii s. lat. (B-thalli plus the remaining A-thalli), as the observed genetic variability is quite high. Three chemotypes were detected in L. isidiata s. lat., and seven in L. santosii s. lat. The two taxa are morphologically well characterized: in L. isidiata s. lat. the thallus is thicker and the propagules larger than in L. santosii s. lat. The first stages of thallus development from single propagules are described in both species. Some critical remarks are made about the increasing use of the species rank for taxa of Lepraria, which are morphologically and genetically scarcely characterized.
Genetically divergent algae shape an epiphytic lichen community on Jack Pine in Manitoba
Authors: DOERING Matthew , PIERCEY-NORMORE Michele D. 
Published: January 2009

AbstractAlgal genotypes should freely associate with different lichen fungi that grow in the same confined habitat giving the appearance of low levels of selectivity and specificity. If genetic compatibility between algal and fungal partners limits the combination of partners, then some degree of taxonomic specificity should be evident. This study examined the photobiont composition in a community of epiphytic lichens on Jack Pine to investigate selectivity and specificity. The objectives of the study were to infer algal identity, to infer photobiont dispersal, and to investigate the distribution of algal genotypes relative to the fungal partner. Photobiont variability was determined by Restriction Fragment Length Polymorphism (RFLP) and nucleotide sequences of the Internal Transcribed Spacer (ITS) of ribosomal DNA (rDNA). Seven species of lichen-forming fungi are reported to associate with five divergent algal genotypes, with only one species,Evernia mesomorpha, showing some degree of selectivity and specificity. The algae represent at least two species (Trebouxia jamesiiandT. impressa) for the area confined to 200cm2on the north side of 20 Jack Pine trees. Gene flow was inferred in this tightly defined community of lichenized algae. The algal sharing and inferred gene flow may suggest that soredia provide a means of algal transport and distribution among lichen-forming fungi in the habitat.
Two new foliicolous species of Enterographa (Roccellaceae) from Kenya
Authors: YESHITELA Kumelachew , FISCHER Eberhard , KILLMANN Dorothee , SÉRUSIAUX Emmanuël 
Published: January 2009

AbstractEnterographa fellhaneroides and E. meklitiae are described as new to science from Kakamega Forest in Western Kenya. The latter overgrows the thallus of a foliicolous non-filamentous Coenogonium and the former most probably has the same ecology. Both species appear to be closely related to E. brezhonega and E. epiphyllum.
Prolonging the careers of older information technology workers: continuity, exit or retirement transitions?
Authors: BROOKE LIBBY 
Published: January 2009

ABSTRACTThe article explores the ways in which older workers' career trajectories influenced their exit from or continuity of employment in the Australian information technology (IT) industry. The data were collected through qualitative interviews with 71 employees of 10 small and medium-sized IT firms as part of the cross-countryWorkforce Ageing in the New Economyproject (WANE), which was conducted in Canada, the United States, Australia and several European Union countries (the United Kingdom, Germany and The Netherlands). The analysis revealed that older IT workers' capacity to envisage careers beyond their fifties was constrained by age-based ‘normative’ capability assumptions that resulted in truncated careers, dissuaded the ambition to continue in work, and induced early retirement. The workers' constricted, age-bound perspectives on their careers were reinforced by the rapid pace of technological and company transformations. A structural incompatibility was found between the exceptional dynamism and competitiveness of the IT industry and the conventional age-staged and extended career. The analysis showed that several drivers of occupational career trajectories besides the well-researched health and financial factors predisposed ‘default transitions’ to exit and retirement. The paper concludes with policy and practice recommendations for the prolongation of IT workers' careers and their improved alignment with the contemporary lifecourse.
Widowers' strategies of self-representation during research interviews: a sociological analysis
Authors: VAN DEN HOONAARD DEBORAH K. 
Published: January 2009

ABSTRACTThis article analyses the strategies that older widowers used to assert their masculinity during in-depth research interviews by the author, a middle-aged woman. Twenty-six widowers living in Atlantic Canada and Florida in the United States and who were aged from 56 to 91 years participated in the study. The author analysed the interviews from a symbolic-interactionist perspective that looks at the world from the perspective of those being studied. The widowers used various strategies of impression management to reinforce their identity as ‘real men’ during the interviews. These strategies included taking charge of the interview, using personal diminutives and endearments to assert control, lecturing the interviewer about various topics including differences between men and women, and bringing attention to their heterosexuality by referring to themselves as bachelors and commenting on increased attention from women. The paper chronicles the process of discovery of the importance to the study participants of portraying themselves as men. It was found that older widowers' identity as ‘real men’ is precarious because they lack three essential components of masculinity: being in a heterosexual relationship, being employed, and being young. The article makes extensive use of the participants' quotations to demonstrate their attempts, through impression management, to maintain a masculine identity while discussing the very topics that threatened it.
The erosion of filial piety by modernisation in Chinese cities
Authors: CHEUNG CHAU-KIU , KWAN ALEX YUI-HUEN 
Published: January 2009

ABSTRACTWhether filial piety or financial support to older parents is eroded or maintained through societal modernisation is an unresolved issue in China and a matter of widespread concern. Whereas structural-functionalist theories predict erosion, alternative views suggest that modernisation reduces filial piety only minimally or conditionally. One possible condition that resists the modernisation effect is education. The impacts of modernisation and its interaction with Chinese education are therefore the focus of this study. Using various sources, the paper reports analyses of the relationships between the levels of modernisation in six Chinese cities, measured by average gross domestic product per capita, the average wage and the percentage of the workforce that are employed in the service sector, and variations in expressions of filial piety and cash payments to parents. Representative samples of the cities' adult residents were used. It was found that filial piety and cash payments were lower when the citizen was in a city with higher or more advanced modernisation, and that the reduction in affirmations of filial piety associated with higher modernisation was less among citizens with higher education. It is concluded that educational policy and practice can be a means to sustain filial piety in the face of modernisation.
America’s Middle East grand strategy after Iraq: the moment for offshore balancing has arrived
Authors: LAYNE CHRISTOPHER 
Published: January 2009

AbstractIn this paper, I argue that there is an emerging consensus among realists that the US should abandon its hegemonic strategy and adopt an offshore balancing strategy. Here, Iraq and the so called war on terrorism (or ‘long war’, or ‘global counter-insurgency’, as some American officials sometimes refer to it) have been the catalysts. Increasingly, it is recognised that US aims in the Persian Gulf/Middle East – and the American military presence in the region – have fuelled terrorism, and caused Iran to self-defensively seek to acquire a nuclear weapons capability. A number of leading realists now argue that the best strategy for the US is to extricate itself from Iraq, reduce its regional footprint, and adopt an offshore balancing strategy.
American power preponderance and the nuclear revolution
Authors: CRAIG CAMPBELL 
Published: January 2009

AbstractThe theory of Power Preponderance put forward by Stephen Brooks and William Wohlforth is poised to replace structural balance-of-power theory as the leading American Realist interpretation of international politics. Power Preponderance argues that would-be rivals to the US are not balancing against it because they are dissuaded from doing so by geopolitical and structural factors, rather than because they love the US or are cowed by it. This article shows why the central analytical claim of Power Preponderance would be substantially enhanced by incorporating the logic of the nuclear revolution, but that its main policy recommendation – indefinite and magnanimous American preponderance – is undermined by the spectre of nuclear war. In the nuclear age, normative solutions to the problem of anarchy invariably gravitate toward the logic of a world state.
The construction of US financial power
Authors: KONINGS MARTIJN 
Published: January 2009

AbstractCritical work in international political economy (IPE) has sought to theorise US financial power through the concept of structural power, intended as a means to go beyond state-centric conceptions of political power and to trace the state’s interaction with socio-economic forces. But due to the tendency to ontologise the distinction between state and market, IPE has not been fully successful in articulating the linkages between structural power and state power. The article then examines literature in the field of cultural political economy (CPE), which emphasises the constitutive importance of the cultural norms and practices situated at the level of everyday life. The CPE literature fails to challenge established IPE accounts in some key respects, and the article relates this to its conception of political power. The article develops an institution-based perspective that is more suitable to theorising the linkages between structural power and state power, and then proceeds to develop an interpretation of the construction of American financial power over the course of the 20th century. It reinterprets some of the key moments in the history of US and global finance and re-examines notions of American financial decline.
Hegemonic transition in East Asia? The dynamics of Chinese and American power
Authors: BEESON MARK 
Published: January 2009

AbstractThe ‘rise of China’ is seen by some observers as a precursor of inevitable hegemonic competition in East Asia. At the very least, it seems likely that China’s influence in East Asia will grow at the expense of the United States. Whether this will eventually amount to a form of ‘hegemonic transition’ is far less clear. It is, therefore, an opportune moment to consider the relative strengths and weaknesses of China and the US in East Asia. This paper suggests that the nature of hegemonic competition and transition is more uncertain and complex than some of the most influential theoretical understandings of hegemony would have us believe.
Conceptualising hegemonic legitimacy
Authors: RAPKIN DAVID P. , BRAATEN DAN 
Published: January 2009

AbstractWhat is international legitimacy and whence does it stem? What entities seek it and why, and who grants or withholds it? How might the different meanings of the concept be reconciled? This article argues that Family Resemblance Concept (FRC) methods are particularly well-suited to explicating the complex meanings associated with this multidimensional concept. We start with a basic level definition based on subjective perceptions and beliefs, the normative quality of oughtness, and the idea of consent. We then expand this definition by developing several secondary-level dimensions: shared values, constitutionalism (consisting of two forms of process legitimacy), and outcome legitimacy. At the indicator level, we examine 14 different survey questions asked in international public opinion polls to provide a tentative empirical glimpse of how our FRC version of legitimacy could be operationalised and tested. The paper concludes with a discussion of the usefulness of the FRC scheme in imposing some order on the legitimacy concept and in illuminating the recent legitimacy problems afflicting the United States.
Matrioshka hegemony? Multi-levelled hegemonic competition and security in post-Soviet Central Asia
Authors: DEYERMOND RUTH 
Published: January 2009

AbstractA multi-levelled hegemonic encounter has developed in Central Asia, in which a global hegemon, the USA; a regional hegemon, the Russian Federation; an aspirant sub-regional hegemon, Uzbekistan; and an emergent regional and global hegemon, China, co-exist within the framework of Central Asian security politics. Where these hegemons’ interests do not conflict this can be characterised as a matrioshka model of hegemony: the different level hegemons can accommodate one another peacefully and where their interests coincide they can form alliances. The model of multi-levelled hegemony developed here highlights the simultaneous presence of competition and cooperation. This article explores the way in which the various bilateral hegemonic relations in the region also indicate that actual and emergent hegemonic states at different levels can cooperate as hegemons in order to challenge, or to respond to challenge, by hegemonic states at other levels. This helps to clarify the question of whether the increasingly competitive interaction between these states is likely to lead to conflict.
Enacting meaning-in-use: qualitative research on norms and international relations
Authors: WIENER ANTJE 
Published: January 2009

AbstractThis article proposes a framework for empirical research on contested meaning of norms in international politics. The goal is to identify a design for empirical research to examine associative connotations of norms that come to the fore when norms are contested in situations of governance beyond-the-state and especially in crises. If cultural practices shape experience and expectations, they need to be identified and made ‘account-able’ based on empirical research. To that end, the proposed qualitative approach centres on individually enacted meaning-in-use. The framework comprises norm-types, conditions of contestation, types of divergence and opposition-deriving as a specific interview evaluation technique. Section one situates the problem of contestation in the field of constructivist research on norms. Section two introduces distinctive conditions of contestation and types of norms. Section three details the methodology of conducting and evaluating interviews and presents the technique of opposition-deriving with a view to reconstructing the structure of meaning-in-use. Section four concludes with an outlook to follow-up research.
Constructivist methods: a plea and manifesto for pluralism
Authors: LUPOVICI AMIR 
Published: January 2009

AbstractMy aim in this article is to improve the methodology of the modernist constructivist approach and to provide a more coherent, rigid, and systematic constructivist framework for research. I do this by combining the methods of process tracing, discourse analysis, and counterfactuals. In addition, I aim to provide clearer methodological criteria for the evaluation of constructivist research by modifying some of the positivist criteria and adding the criterion of contextual validity. I assert that a more coherent methodology will strengthen and improve constructivist study and may contribute to better communication between constructivist and positivist scholars.
British irony, global justice: a pragmatic reading of Chris Brown, Banksy and Ricky Gervais
Authors: BRASSETT JAMES 
Published: January 2009

AbstractThe article provides a critical analysis of the concept of irony and how it relates to global justice. Taking Richard Rorty as a lead, it is suggested that irony can foreground a sense of doubt over our own most heartfelt beliefs regarding justice. This provides at least one ideal sense in which irony can impact the discussion of global ethics by pitching less as a discourse of grand universals and more as a set of hopeful narratives about how to reduce suffering. The article then extends this notion via the particular – and particularly – ethnocentric case of British Irony. Accepting certain difficulties with any definition of British Irony the article reads the interventions of three protagonists on the subject of global justice – Chris Brown, Banksy and Ricky Gervais. It is argued that their considerations bring to light important nuances in irony relating to the importance of playfulness, tragedy, pain, self-criticism and paradox. The position is then qualified against the (opposing) critiques that irony is either too radical, or, too conservative a quality to make a meaningful impact on the discussion of global justice. Ultimately, irony is defended as a critical and imaginative form, which can (but does not necessarily) foster a greater awareness of the possibilities and limits for thinking/doing global justice.%‘‘The comic frame, in making a man the student of himself, makes it possible for him to ‘transcend’ occasions when he has been tricked or cheated, since he can readily put such discouragements into his ‘assets’ column, under the heading of ‘experience’. . . . In sum, the comic frame should enable people to be observers of themselves, while acting.Blackadder: Baldrick, have you no idea what irony is?Baldrick: Yes, it’s like goldy and bronzy only it’s made out of iron.’’
Electron injection into laser wakefields by colliding circularly-polarized laser pulses
Authors: Wang W.-M. , Sheng Z.-M. , Zhang J. 
Published: January 2009

AbstractElectron injection into a laser wakefield by the colliding of two circularly polarized laser pulses is analyzed by the Hamiltonian approach and particle-in-cell simulations. If the pump pulse driving the laser wakefield is right-circularly-polarized, electron injection is found only when the counter-propagating injection pulse is left-circularly-polarized and vice versa. This holds when the injection pulse is at low intensity and has a frequency near the pump pulse frequency ω0. For a moderately intense injection pulse, even if the two pulses have the same polarization, electron injection is found but with less efficiency. It is also found that the injection pulse with the frequency within [0.5ω0,3ω0] can still create electron injection efficiently provided it has the opposite polarization with the pump pulse.
Spatial and temporal characteristics of X-ray emission from hot plasma driven by a relativistic femtosecond laser pulse
Authors: Hong W. , He Y. , Wen T. , Du H. , Teng J. , Qing X. , Huang Z. , Huang W. , Liu H. , Wang X. , Huang X. , Zhu Q. , Ding Y. , Peng H. 
Published: January 2009

AbstractWe present the temporal and spatial characterization of X-ray sources (at ~1 keV) driven by a 200 TW, 30 fs, 800 nm laser pulse on SILEX-I laser facility at Research Center of Laser Fusion. For laser copper foil interaction with laser intensity between 6 × 1018 W/cm2and 3 × 1019 W/cm2, the X-ray images show cone-like jet structures. While the yield of X-rays is strongly dependent on the laser intensity, the plasma expansion length is weakly dependent on the laser intensity, and the open angle of the cone-like jet is not correlated to the laser intensity. The formation of the jet structure is attributed to the plasma transverse confine by the self-induced quasi-static magnetic field. An X-ray pedestal 4 ns preceding the main pulse was observed. The correlation between X-ray pedestal and collimated proton beam generation was found.
Circuit simulation of the behavior of exploding wires for nano-powder production
Authors: Mao Z. , Zou X. , Wang X. , Liu X. , Jiang W. 
Published: January 2009

AbstractThe electrical behavior of exploding wires was obtained by numerically solving the nonlinear differential equation describing the discharge circuit. For metal wires of high conductivity and low sublimation heat, such as copper, aluminum, gold, and silver, the circuit simulation can be well performed based on the resistivity model developed by Tucker in which the resisitivity is expressed by the explicit functions of specific action, i.e., ρ = f(g). For metals such as titanium and zinc with anomalously changing resistivity, i.e., decreasing rather than increasing with the liquid heating, the circuit simulation of the exploding wires can be performed using the implicit relationship between ρ andgthat is read out point by point from the experimentally measured curve. Using the circuit simulation, the rate of the energy deposition in the exploding wires before the explosion can be obtained, which is helpful to choose the right experimental conditions for possible overheating that is desirable for getting smaller nano-powders produced by exploding wires.
Electron bunch injection at an angle into a laser wakefield
Authors: Luttikhof M.J.H. , Khachatryan A.G. , van Goor F.A. , Boller K.-J. , Mora P. 
Published: January 2009

AbstractExternal injection of electron bunches longer than the plasma wavelength in a laser wakefield accelerator can lead to the generation of femtosecond ultra relativistic bunches with a couple of percent energy spread. Extensive study has been done on external electron bunch (e.g., one generated by a photo-cathode RF linac) injection in a laser wakefield for different configurations.In this paper, we investigate a new way of external injection where the electron bunch is injected at a small angle into the wakefield. This way one can avoid the ponderomotive scattering as well as the vacuum-plasma transition region, which tend to destroy the injected bunch. In our simulations, the effect of the laser pulse dynamics is also taken into account. It is shown that injection at an angle can provide compressed and accelerated electron bunches with less than 2% energy spread. Another advantage of this scheme is that it has less stringent requirements in terms of the size of the injected bunch and there is the potential to trap more charge.