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  • Artikel  (74)
  • Artikel: DFG Deutsche Nationallizenzen  (74)
  • Blackwell Publishing Ltd.  (74)
  • Sociologie  (57)
  • Geologie und Paläontologie  (17)
  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Emerging from a study of Internet adoption in UK Midlands manufacturing small firms is a new typology characterising owners and key staff as Warriors, Interpreters, Clerks and Priests. This typology is used to explore the impacts of internal factors and organisational culture on innovation and new technology usage in small firms.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: A conceptual model of the changes in small and medium enterprise interfaces and relationships consequent on their adoption of information and communication technologies is developed and explored in this paper. Emphasis is placed on the implications for management, employees and working practices. Empirical evidence from two organisations is provided to illustrate the model and corroborate this new perspective.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: In an empirical study of teleworking practices in small and medium-sized enterprises (SMEs) in west London, organisational factors such as management attitudes, worker autonomy and employment flexibility were found to be more critical than technological provision in facilitating successful implementation. Consequently, we argue that telework in most SMEs appears as a marginal activity performed mainly by managers and specialist mobile workers.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper examines the use of connectivity technologies among 80 small and medium-sized enterprises operating in the North East of England. The paper demonstrates that translation of connectivity technologies into e-flexible working practices is highly dependent on the firm's organisational structure and managerial capacity.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper investigates small business employers’ willingness to participate in online training based on survey of 716 Western Australian small business employers. The results indicate that those small business employers with aspirations towards business growth and who are existing Internet users are more likely to participate in online training than those without growth aspirations.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This article analyses teamwork in French car manufacturing plants and those of their suppliers. During the 1990s, the introduction of ‘autonomous production units’ was aimed at reducing costs, increasing quality and shortening delivery deadlines. Teamwork in a unit involved delegating responsibilities to workers and led to an increased workload.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: We can see technology changing people's private and working lives. But what happens when these two worlds collide? This paper explores two small organisations that have taken different approaches to the use of mobile phone technology. This area of contested terrain is becoming increasingly present on the landscape of the employment relationship.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This article presents findings from a study of control operators that raise concerns about safety-critical knowledge, culture and training. It is argued that the adoption of automated control systems can hinder the transfer of knowledge amongst operators, and this becomes an increasingly serious hazard as tacit knowledge is lost because of employee turnover.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper reports the results of a detailed case study and analysis of a substantial teleworking experiment. The study used rigorous quantitative techniques supported by qualitative methods to examine the business case for teleworking. The research provides evidence that supports some findings of other well-grounded research and questions others.
    Materialart: Digitale Medien
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  • 11
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper reports the empirical findings of several surveys conducted among enterprises in Portugal in order to identify and summarise relevant enablers and constraints that may influence the implementation of telework in the Portuguese business environment. It also provided some common characteristics that will help us draw the profile of a Portuguese potential teleworker.
    Materialart: Digitale Medien
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  • 12
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Organisational Intranets provide a testing ground where certain theories of technology and organisations meet with emerging innovative practice. This paper develops a theoretical framework that is used to analyse a case study of the adoption, introduction and use of a company Intranet focusing on the competing representations of the Intranet presented by the staff involved.
    Materialart: Digitale Medien
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  • 13
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: The concept of emotional labour provides an incomplete account of interactive service work, underplaying its invisible cognitive and non-routine elements. In interactive work, from customer service jobs in the fast food industry to ‘knowledge work’ and at those levels in between on which we focus here, many jobs involve ‘articulation work’—the often unacknowledged management of awkward intersections among the social worlds of people, technology and organisations.
    Materialart: Digitale Medien
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  • 14
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Through a longitudinal study of a mature family firm, this paper investigates the adoption and use of information technology in a family business. It is argued that the adoption and use of information technology is influenced by five key factors. These factors are discussed, leading to a presentation of a series of implications and conclusions.
    Materialart: Digitale Medien
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  • 15
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: New information and communication technologies enable the spatial reconfiguration of work opening up possibilities for work to take place across multiple locations. This paper explores the implications of hybrid workspace through a new empirical study. It argues that spatial hybridity changes the nature of work, organisation and management across domestic space, organisational space and in cyberspace.
    Materialart: Digitale Medien
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  • 16
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: A flexible definition of teleworking suggests that it is more widespread than is generally believed. However, is telework technologically driven? This is tested with data from six countries. As the categories of the definition have distinctive social characteristics, telework seems to reflect traditional occupational practices rather than a major technological shift.
    Materialart: Digitale Medien
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  • 17
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: A number of employees individually and cooperatively resist the controls of the electronic surveillance systems in the PowerGrid call centre. However, this is not the case in all teams. One team is faced with a labour process that directs their resistance to be focused directly at management, rather than at management via the machine.
    Materialart: Digitale Medien
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  • 18
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This study aims to explain employees’ adaptability to information and communications technology (ICT), using a representative sample of 713 employees in the Netherlands. The willingness to acquire ICT competencies and the mastery of equipment and software are primarily affected by intensity of ICT use, an informated ICT strategy of the organisation and an intensive personnel policy.
    Materialart: Digitale Medien
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  • 19
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 20 (2005), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Internet use is increasing among all segments of society, including labour unions. In this article, the authors examine the role that training plays in internet use among union leaders. A survey was conducted among union leaders in a large Midwestern state with an economy widely spread among agricultural, manufacturing, mining, transportation and public sectors. Applying theories of technology acceptance and social learning, the researchers proposed that formal training leads to internet use and that formal training reduces problems encountered by internet users. Formal training was found to have a significant relationship with both the use and reduction of many of the problems associated with internet use.
    Materialart: Digitale Medien
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  • 20
    Digitale Medien
    Digitale Medien
    PO Box 1354, 9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 53 (2005), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
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  • 21
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper reports a research study into the career experiences and perspectives of a sample of women managers in the telecommunications industry in Greece. The study was conducted from a social constructionist perspective, seeking to explore how social and cultural factors affect the managers’ perceptions. Tensions are explored between the research participants’ relative satisfaction with their career progress and their limited representation at the senior management levels. The strength of cultural expectations on Hellenic women to marry is noted.(The authors are the primary researcher and her research supervisor, respectively.)
    Materialart: Digitale Medien
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  • 22
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: In this article the literature on masculinity, gender and technology or science provides the context for discussing two case studies where new information technology has recently been introduced. The empirical material is counter-intuitive to the general understanding that technology reflects and reinforces men's masculinity and the article provides a variety of theoretical interpretations for these findings.
    Materialart: Digitale Medien
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  • 23
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
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  • 24
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper considers the skills and development prospects of women working in European services. Skills are increasingly job-specific, including the relational skills necessary to the delivery of customer service. Formal training is declining and being replaced by informal learning techniques. Opportunities to acquire comprehensive or transferable skills are rare, as are women's progression opportunities in the ‘knowledge society’.
    Materialart: Digitale Medien
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  • 25
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper explores the career and work experiences of a little researched group: highly skilled women IT contractors. It considers their reasons for entering the IT field, including the decision to become contractors. It demonstrates the complexity of power and influence of IT contractors and the resilience of the gender order in IT work.
    Materialart: Digitale Medien
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  • 26
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This article illustrates how themes which were prominent in the industrial sociology of the 1960s and 1970s can refine our understanding of how management processes impact on the introduction of new technology and the employment relationship. Using a case study in the air traffic sector, this paper shows how middle managers’ competitive struggles and over-reliance on worker informality can lead to omissions in the planning of technical change and the neglect of worker concerns during its implementation.
    Materialart: Digitale Medien
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  • 27
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: The objective of this paper is to examine the implications of the internet for public sector organisations. Although there are considerable barriers to the full implementation of internet technologies, the findings illustrate that the internet presents public sector organisations with the potential to enhance the ways in which they fulfil the needs of users of their products and services.
    Materialart: Digitale Medien
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  • 28
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper presents the case that research on gender and information systems (IS), from both quantitative and qualitative traditions, is problematic as the concept of gender continues to remain under-theorised. This will be elaborated upon with a critique of some recent qualitative and quantitative research papers that have been published in key IS journals within a ten-year period.
    Materialart: Digitale Medien
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  • 29
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper discusses the potential implications of a risk society on identities due to alterations in work practices. The promise of ‘flexibility’ via at-home telework entails a renegotiation of the home–work boundary. This brings into play the gendered identities and roles attached to these different spheres of life. After deconstructing promises made on behalf of telework, we construct an alternative research agenda engaging with writings on changing work identities in the risk society where traditional sureties are called into question.
    Materialart: Digitale Medien
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  • 30
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Tertiary labour is the fastest growing form of work in the West. Additionally, computer and telecommunication mediation of labour is increasingly prevalent. However, little research focuses on subjectivity in technology-mediated tertiary labour. Taking a Foucaultian orientation, this paper describes how desires of subjects and organisations are rendered into power/knowledge and affect subjectivity in one variant of technology-mediated tertiary labour.
    Materialart: Digitale Medien
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  • 31
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Studies of call centre working have focused almost exclusively on the sophistication of technological and bureaucratic systems of labour control. The commercial context in which firms operate remains relatively under-researched, despite exerting a significant influence on job structures and the working out of labour relations.
    Materialart: Digitale Medien
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  • 32
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper focuses on the process of Computer Aided Design (CAD) diffusion into a group engaged in the development of innovative products. Adopting an ethnographic approach, we build a grounded theory for interpreting CAD usage in terms of the interplay between variables such as management orientation, training, actors’ specialisation and deskilling, availability of shared archives, technological discontinuities between organisational areas.
    Materialart: Digitale Medien
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  • 33
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: To control the cost of drugs prescribed by general practitioners (GPs), the Netherlands Ministry of Health decided to implement an electronic prescription system. This paper uses an interpretive perspective to analyse the reasons for limited acceptance of the system. While the promotion campaign focused on the system, GPs based their decision on wider contextual factors.
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  • 34
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Best knowledge-sharing practices in team-based work are a ‘must’ for success in flexible and adaptable organisation forms. This research study provides actionable insights on how managers can enhance the knowledge worker's willingness to collaborate in a specific type of virtual teaming, the learning team, and build better communication and collaboration practices in and between these teams.
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  • 35
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This article analyses the use of normative control through recruitment, work organisation, social events, and bargaining processes within two Australian telecommunication call centres. Rather than arguing that such control reduced employees to ‘self-disciplining subjects’, it suggests that these control mechanisms embodied significant levels of managerial coercion and therefore attracted varying levels of resistance.
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  • 36
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 19 (2004), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This article provides case study analysis of the impact of high performance work practices and workplace partnership on skilled workers in the UK's aerospace industry. In contrast to assumptions that such practices increase empowerment and participation we find evidence of a democratic deficit in workplace decision-making and deterioration in the quality of working life.
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  • 37
    Digitale Medien
    Digitale Medien
    PO Box 1354, 9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 52 (2004), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: Most existing reservoir models are based on 2D outcrop studies; 3D aspects are inferred from correlation between wells, and so are inadequately constrained for reservoir simulations. To overcome these deficiencies, we have initiated a multidimensional characterization of reservoir analogues in the Cretaceous Ferron Sandstone in Utah. Detailed sedimentary facies maps of cliff faces define the geometry and distribution of reservoir flow units, barriers and baffles at the outcrop. High-resolution 2D and 3D ground-penetrating radar (GPR) images extend these reservoir characteristics into 3D to allow the development of realistic 3D reservoir models. Models use geometric information from mapping and the GPR data, combined with petrophysical data from surface and cliff-face outcrops, and laboratory analyses of outcrop and core samples.The site of the field work is Corbula Gulch, on the western flank of the San Rafael Swell, in east-central Utah. The outcrop consists of an 8–17 m thick sandstone body which contains various sedimentary structures, such as cross-bedding, inclined stratification and erosional surfaces, which range in scale from less than a metre to hundreds of metres. 3D depth migration of the common-offset GPR data produces data volumes within which the inclined surfaces and erosional surfaces are visible. Correlation between fluid permeability, clay content, instantaneous frequency and instantaneous amplitude of the GPR data provides estimates of the 3D distribution of fluid permeability and clay content.
    Materialart: Digitale Medien
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  • 38
    Digitale Medien
    Digitale Medien
    PO Box 1354, 9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 52 (2004), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: This paper is concerned with numerical tests of several rock physical relationships. The focus is on effective velocities and scattering attenuation in 3D fractured media. We apply the so-called rotated staggered finite-difference grid (RSG) technique for numerical experiments. Using this modified grid, it is possible to simulate the propagation of elastic waves in a 3D medium containing cracks, pores or free surfaces without applying explicit boundary conditions and without averaging the elastic moduli. We simulate the propagation of plane waves through a set of randomly cracked 3D media. In these numerical experiments we vary the number and the distribution of cracks. The synthetic results are compared with several (most popular) theories predicting the effective elastic properties of fractured materials. We find that, for randomly distributed and randomly orientated non-intersecting thin penny-shaped dry cracks, the numerical simulations of P- and S-wave velocities are in good agreement with the predictions of the self-consistent approximation. We observe similar results for fluid-filled cracks. The standard Gassmann equation cannot be applied to our 3D fractured media, although we have very low porosity in our models. This is explained by the absence of a connected porosity. There is only a slight difference in effective velocities between the cases of intersecting and non-intersecting cracks. This can be clearly demonstrated up to a crack density that is close to the connectivity percolation threshold. For crack densities beyond this threshold, we observe that the differential effective-medium (DEM) theory gives the best fit with numerical results for intersecting cracks. Additionally, it is shown that the scattering attenuation coefficient (of the mean field) predicted by the classical Hudson approach is in excellent agreement with our numerical results.
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  • 39
    Digitale Medien
    Digitale Medien
    PO Box 1354, 9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 52 (2004), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: An intuitive method is presented for extending Hale–McClellan migration operators to handle surveys binned and stacked with in-line and cross-line spacings unequal. This avoids re-interpolating the input to 3D migration, either externally or internally. The algorithm does not require an integer or rational ratio between the in-line and cross-line spacings in order to be applied nor does it deliberately introduce artificial aliasing by interleaving subsampled grids along the more finely sampled axis. Examples of its impulse response and application to the SEG–EAGE salt model are shown.
    Materialart: Digitale Medien
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  • 40
    Digitale Medien
    Digitale Medien
    PO Box 1354, 9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 52 (2004), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: Euler deconvolution and the analytic signal are both used for semi-automatic interpretation of magnetic data. They are used mostly to delineate contacts and obtain rapid source depth estimates. For Euler deconvolution, the quality of the depth estimation depends mainly on the choice of the proper structural index, which is a function of the geometry of the causative bodies. Euler deconvolution applies only to functions that are homogeneous. This is the case for the magnetic field due to contacts, thin dikes and poles. Fortunately, many complex geological structures can be approximated by these simple geometries. In practice, the Euler equation is also solved for a background regional field. For the analytic signal, the model used is generally a contact, although other models, such as a thin dike, can be considered. It can be shown that if a function is homogeneous, its analytic signal is also homogeneous. Deconvolution of the analytic signal is then equivalent to Euler deconvolution of the magnetic field with a background field. However, computation of the analytic signal effectively removes the background field from the data. Consequently, it is possible to solve for both the source location and structural index. Once these parameters are determined, the local dip and the susceptibility contrast can be determined from relationships between the analytic signal and the orthogonal gradients of the magnetic field. The major advantage of this technique is that it allows the automatic identification of the type of source. Implementation of this approach is demonstrated for recent high-resolution survey data from an Archean granite-greenstone terrane in northern Ontario, Canada.
    Materialart: Digitale Medien
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  • 41
    Digitale Medien
    Digitale Medien
    PO Box 1354, 9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 52 (2004), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: We present an adaptation of the full multigrid algorithm in DC resistivity modelling in an effort to increase its accuracy. There is a great difficulty with conventional multigrid solvers in representing the physics of an arbitrary distribution of electrical conductivity on a very coarse grid. In general, conventional rectangular finite-difference or 5-point approximations of Poisson's equation cannot represent, at a coarse grid level, the effective anisotropy on a coarse scale which results from fine structure in the model. An exception to this generalization occurs when the principal axes of structural anisotropy are aligned with the coordinate axis. Additional and similarly generated problems arise when a coarse cell is obliged to represent fine structure containing very high conductivity contrasts. We have developed an adaptation of the usual resistive-network representation of the continuum, which avoids some of these problems, and have compared it with the traditional resistive network currently used. The network adaptation consists of replacing the usual 5-point Laplacian operator stencil used on the finite-difference grid with a 9-point stencil, and the conductivity scalar with a 6-parameter conductivity parametrization. This parametrization permits representation of arbitrarily orientated anisotropy as well as more complex behaviour related to high conductivity contrasts. The importance of multigrid solvers does not lie in their speed at forward modelling (which is comparable with other methods), but rather in their potential for inverse modelling. Inverse solvers which proceed by refinement of an initially very coarse solution can, in principle, take time only linearly proportional to the number of gridpoints in the final desired model.
    Materialart: Digitale Medien
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  • 42
    Digitale Medien
    Digitale Medien
    PO Box 1354, 9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 52 (2004), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: A unified approach to approximating phase and group velocities of qP seismic waves in a transversely isotropic medium with vertical axis of symmetry (VTI) is developed. While the exact phase-velocity expressions involve four independent parameters to characterize the elastic medium, the proposed approximate expressions use only three parameters. This makes them more convenient for use in surface seismic experiments, where the estimation of all four parameters is problematic. The three-parameter phase-velocity approximation coincides with the previously published ‘acoustic’ approximation of Alkhalifah. The group-velocity approximation is new and noticeably more accurate than some of the previously published approximations. An application of the group-velocity approximation for finite-difference computation of traveltimes is shown.
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  • 43
    Digitale Medien
    Digitale Medien
    PO Box 1354, 9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 52 (2004), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: Regularization is the most popular technique to overcome the null space of model parameters in geophysical inverse problems, and is implemented by including a constraint term as well as the data-misfit term in the objective function being minimized. The weighting of the constraint term relative to the data-fitting term is controlled by a regularization parameter, and its adjustment to obtain the best model has received much attention. The empirical Bayes approach discussed in this paper determines the optimum value of the regularization parameter from a given data set. The regularization term can be regarded as representing a priori information about the model parameters. The empirical Bayes approach and its more practical variant, Akaike's Bayesian Information Criterion, adjust the regularization parameter automatically in response to the level of data noise and to the suitability of the assumed a priori model information for the given data. When the noise level is high, the regularization parameter is made large, which means that the a priori information is emphasized. If the assumed a priori information is not suitable for the given data, the regularization parameter is made small. Both these behaviours are desirable characteristics for the regularized solutions of practical inverse problems. Four simple examples are presented to illustrate these characteristics for an underdetermined problem, a problem adopting an improper prior constraint and a problem having an unknown data variance, all frequently encountered geophysical inverse problems. Numerical experiments using Akaike's Bayesian Information Criterion for synthetic data provide results consistent with these characteristics. In addition, concerning the selection of an appropriate type of a priori model information, a comparison between four types of difference-operator model – the zeroth-, first-, second- and third-order difference-operator models – suggests that the automatic determination of the optimum regularization parameter becomes more difficult with increasing order of the difference operators. Accordingly, taking the effect of data noise into account, it is better to employ the lower-order difference-operator models for inversions of noisy data.
    Materialart: Digitale Medien
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  • 44
    Digitale Medien
    Digitale Medien
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 56 (2003), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 45
    Digitale Medien
    Digitale Medien
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 56 (2003), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 46
    Digitale Medien
    Digitale Medien
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 56 (2003), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 47
    Digitale Medien
    Digitale Medien
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 56 (2003), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 48
    Digitale Medien
    Digitale Medien
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 56 (2003), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 49
    Digitale Medien
    Digitale Medien
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 56 (2003), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 50
    Digitale Medien
    Digitale Medien
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 56 (2003), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 51
    Digitale Medien
    Digitale Medien
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 56 (2003), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Books reviewed:Masahiko Aoki, Toward a Comparative Institutional Analysis. CambridgeAlbert Breton, Gianluigi Galeotti, Pierre Salmon, Ronald Wintrobe (eds.), Political Extremism and RationalityGerard Caprio, Patrick Honohan and Joseph E. Stiglitz (eds.), Financial LiberalizationRichard N. Cooper and Richard Layard (eds.), What the Future HoldsStephen Dobson and John Goddard, The Economics of FootballAlfred Endres und Immo Querner, Die Ökonomie natürlicher RessourcenDieter Freiburghaus, (Hrsg.) Wohin des Wegs, Europa?Gianluigi Galeotti, Pierre Salmon and Ronald Wintrobe (eds.), Competition and StructureDietmar Hübner, Entscheidung und Geschichte – rationale Prinzipien, narrative Strukturen und ein Streit in der Ökologischen EthikAdam B. Jaffe and Manuel Trajtenberg (eds.), Patents, Citations, InnovationsThomas Kucera, Olga Kucerovó, Oksana Opara und Eberhard Schaich (eds.), New Democraphic Faces of EuropeYadong Luo, China’s Service SectorDennis C. Mueller (ed.), The Economics of PoliticsSupachai Panitchpakdi and Mark L Clifford, China and the WTOJames E. Rauch and Alessandra Casella (eds.), Networks and MarketsJ. Adam Tooze, Statistics and the German State, 1900–1945
    Materialart: Digitale Medien
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  • 52
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 18 (2003), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper examines the effects of infrastructure and isolation on rural telework, and the potential of telework for rural communities. It draws on findings from two Australian case studies: a government initiative and a community-initiated training project. Differences between the experiences of rural and urban teleworkers are highlighted.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 53
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 18 (2003), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: This paper is designed to enlarge our understanding of how computing is perceived. It uses findings from a quantitative and qualitative study of Computer Science and Psychology students. The paper shows how students believe they have an equal chance in Computing Science and are failing to acknowledge inequality.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 54
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 18 (2003), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Based on case studies, this article seeks to determine whether or not German car manufacturers are exporting a ‘German production model’ to overseas plants and to what extent the overseas operations have a reciprocal effect on production methods in the originating country. It is argued that the most adequate analytical concept is one that emphasises interest-driven organisational learning processes.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 55
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 18 (2003), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: Recent technological innovations have emphasised increasing integration between enterprises across the supply chain. This article reviews these developments within US grocery distribution and highlights the potential for supply chain integration to increase union bargaining power, as well as employer strategies aimed at reducing the threat of industrial vulnerability resulting from cross-enterprise interdependence.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 56
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    New technology, work and employment 18 (2003), S. 0 
    ISSN: 1468-005X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: New technology being introduced into nursing makes possible the surveillance of practice via an ‘electronic panopticon’. This paper reports on a qualitative study of these systems in the UK NHS, where the attempt to monitor nursing practice failed, not least due to the complexities of nursing culture and practice at ward level.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 57
    Digitale Medien
    Digitale Medien
    9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 51 (2003), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: We find errors in theory and application in the paper by van der Kolk et al. (Geophysical Prospecting49, 179–197 (2001)) that invalidate their arguments for the cause of the reduction in the velocity of the vertically propagating slower split shear-wave in the gas cap over the Natih field in Oman. We suggest that existing theories are adequate and can explain the anomaly.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 58
    Digitale Medien
    Digitale Medien
    9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 51 (2003), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: We compare two geophysical survey measurements of the same type made at different times in order to characterize the change in the geological medium during the elapsed time. The aim of this study is to develop a strategy using a full non-linear inversion algorithm as the interpretation tool. In this way, not only the location and the form of the changes are recovered, but also the changes in the material parameters of the geological medium can be estimated. In order to solve this fully non-linear problem, the so-called ‘multiplicative regularized contrast source inversion’ (MR-CSI) method is employed. The unique property of this iterative method is that it does not solve the forward problem at each iterative step. This makes it possible to use the non-linear inversion algorithm for large-scale computation problems. The numerical results show that by taking into account the non-linear nature of the problem, interpretation of the time-lapse data can be significantly improved, compared with that obtained using linear inversion.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 59
    Digitale Medien
    Digitale Medien
    9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 51 (2003), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: Transverse isotropy with a tilted axis of symmetry (TTI) causes image distortion if isotropic models are assumed during data processing. A simple anisotropic migration approach needs long computational times and is sensitive to the signal-to-noise ratio. This paper presents an efficient, general approach to common-depth-point (CDP) mapping to image the subsurface in TTI media from qP-wave seismic data by adding anisotropic and dip parameters to the velocity model. The method consists of three steps: (i) calculating traveltimes and positions of the CDP points; (ii) determining CDP trajectories; (iii) CDP imaging. A crucial step is the rapid computation of traveltimes and raypaths in the TTI media, which is achieved by the Fermat method, specially adapted for anisotropic layered media. The algorithm can image the subsurface of a given model quickly and accurately, and is suitable for application to a bending reflector. The effectiveness of the method is demonstrated by comparing the raypaths, the traveltimes and the results of CDP mapping, when assuming isotropic media, transversely isotropic media with a vertical axis of symmetry (TIV), and TTI media.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 60
    Digitale Medien
    Digitale Medien
    9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 51 (2003), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: Migration velocity analysis is carried out by analysing the residual moveout and amplitude variations in common image point gathers (CIGs) parametrized by scattering angle and azimuth. The misfit criterion in the analysis is of the differential-semblance type. By using angles to parametrize the imaging we are able to handle and exploit data with multiple arrivals, although artefacts may occur in the CIGs and need to be suppressed.The CIGs are generated by angle migration, an approach based on the generalized Radon transform (GRT) inversion, and they provide multiple images of reflectors in the subsurface for a range of scattering angles and azimuths. Within the differential semblance applied to these CIGs, we compensate for amplitude versus angle (AVA) effects. Thus, using a correct background velocity model, the CIGs should have no residual moveout nor amplitude variation with angles, and the differential semblance should vanish. If the velocity model is incorrect, however, the events in the CIGs will appear at different depths for different angles and the amplitude along the events will be non-uniform. A standard, gradient-based optimization scheme is employed to develop a velocity updating procedure. The model update is formed by backprojecting the differential semblance misfits through ray perturbation kernels, within a GRT inverse. The GRT inverse acts on the data, subject to a shift in accordance with ray perturbation theory.The performance of our algorithm is demonstrated with two synthetic data examples using isotropic elastic models. The first one allows velocity variation with depth only. In the second one, we reconstruct a low-velocity lens in the model that gives rise to multipathing. The velocity model parametrization is based upon the eigentensor decomposition of the stiffness tensor and makes use of B-splines.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 61
    Digitale Medien
    Digitale Medien
    9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 51 (2003), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: This paper presents a method for velocity analysis in tilted transversely isotropic (TTI) media by combining CDP mapping with a genetic algorithm. CDP mapping is a velocity analysis method for determining anisotropic velocity but has difficulties due to the following factors: (i) it involves a non-linear and multimodal objective function; (ii) it is prohibitively expensive in the evaluation of candidate solutions, which often involves the calculation of images in the depth domain; (iii) there is often a very large parameter space. Recognizing the global and multimodal nature of the problem, a genetic algorithm is employed to search for the optimal velocity model. The efficiency of the method contributes to two critical processes: rapid model evaluation, achieved by generating CDP mapping only in the neighbourhood of specific reflectors, and fast computation, based on Fermat's principle, of the CDP points and traveltimes in TTI media. The method produces subsurface structure images in the depth domain, and can also solve for Thomsen's anisotropic parameters (ɛ and δ), the vertical velocity and the dip of the symmetry axis in the model space, simultaneously.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 62
    Digitale Medien
    Digitale Medien
    9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 51 (2003), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: The problem of removing directional trends frequently occurs in the processing of magnetic data and also in the subsequent steps of data interpretation. The so-called corrugations are typical directional trends occurring in levelled data, which may be removed in several ways. Classical techniques are based on high-pass filtering of the data and successively filtering these transformed data with directional cosine filters. Other linear features are due to real sources, such as pipelines in shallow surveys or dike swarms in regional surveys. They should, nevertheless, be considered as noise, due to the fact that their effect is strong and tends to hide the field features related to structures of more interest. We deal with both kinds of problem, presenting the results of a study in an archaeological area of southern Italy. Decorrugation of magnetic field anomalies is performed using a method based on the excellent space–frequency localization properties of wavelet bases, allowing a very sharp filtering of the field along a selected direction. We compare this technique with the classical one in a synthetic case and find that the wavelet decorrugation is simpler and produces low distortion maps. Besides the field decorrugation, the wavelet approach was also shown to be useful in the subsequent enhancement of the measured field. In fact, we show that the wavelet analysis offers a unique framework where various filtering problems (directional, isotropic, global or local as well) may be easily solved. As regards the archaeological case, strong noisy effects from elongated sources (pipelines) were successfully removed in a sharp and local way.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 63
    Digitale Medien
    Digitale Medien
    9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 51 (2003), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: A 3D F–K dip-moveout (DMO) is developed, which is applicable to data acquired in an elementary single-fold cross-spread. The key idea is that a 3D log-stretch transform and the inherent regularity of the cross-spread geometry make it possible to transform 3D Fourier DMO. The derived theory generalizes the 2D Fourier shot-gather DMO in the log-stretch domain; 2D turns out to be a special case. Similarly to 2D, the cross-spread DMO becomes convolutional after multidimensional logarithmic stretch. The proposed method works for orthogonal and slanted acquisition geometries; the cross-spread DMO relationships are found to be independent of the intersection angle of the shot and receiver lines. In contrast to integral (Kirchhoff-style) methods, the cross-spread F–K DMO does not degrade from the inevitable irregularity in 3D sampling of offsets in a CMP gather. The newly derived F–K DMO operator can be approximated by finite-difference (FD) schemes; the low-order FD cross-spread DMO equation is shown to be the 3D extension of the Bolondi and Rocca offset continuation. It is shown that F–K and low-order FD operators are effective in a synthetic case.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 64
    Digitale Medien
    Digitale Medien
    9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 51 (2003), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: Shear waves recorded at or near the sea-bed, i.e. a water–sediment interface, may suffer from unwanted phase change, which is detrimental to velocity analysis and processing and degrades the quality of the final stacked or migrated image. In this study, this phenomenon is analysed for P-SV converted waves recorded at the sea-bed. Theoretical analysis shows that phase change does not occur if the converted shear waves always maintain raypaths that lie within the critical angle, provided the subsurface layering is horizontal. A phase change that is asymmetric with offset can readily be explained as being due to dipping layers at targets or the dipping sea-bed. This analysis is extended to multiple layers and anisotropic media and shows that the same conclusions hold. The analysis performed on two sets of ocean-bottom-cable seismic data shows that the majority of observations show little evidence of phase change, and occasionally display the asymmetric phase change with offset. This finding underlines the robustness of converted shear waves for imaging the horizontal subsurfaces and sea-bed as all of the offset information may be used.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 65
    Digitale Medien
    Digitale Medien
    9600 Garsington Road , Oxford OX4 2XG , UK . : Blackwell Publishing Ltd.
    Geophysical prospecting 51 (2003), S. 0 
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: Direct-current (DC) resistivity tomography has been applied to different mountain permafrost regions. Despite problems with the very high resistivities of the frozen material, plausible results were obtained. Inversions with synthetic data revealed that an appropriate choice of regularization constraints was important, and that a joint analysis of several tomograms computed with different constraints was required to judge the reliability of individual features. The theoretical results were verified with three field experiments conducted in the Swiss and the Italian Alps. At the first site, near Zermatt, Switzerland, the location and the approximate lateral and vertical extent of an ice core within a moraine could be delineated. On the Murtel rock glacier, eastern Swiss Alps, a steeply dipping boundary at its frontal part was observed, and extremely high resistivities of several MΩ indicated a high ice content. The base of the rock glacier remained unresolved by the DC resistivity measurements, but it could be constrained with transient EM soundings. On another rock glacier near the Stelvio Pass, eastern Italian Alps, DC resistivity tomography allowed delineation of the rock glacier base, and the only moderately high resistivities within the rock glacier body indicated that the ice content must be lower compared with the Murtel rock glacier.
    Materialart: Digitale Medien
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  • 66
    Digitale Medien
    Digitale Medien
    Oxford UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 55 (2002), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: I gratefully acknowledge helpful comments and suggestions by the participants of this conference, especially Geoffrey Brennan, Christoph Engel and Torsten Persson, as well as by Simon Gaechter.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 67
    Digitale Medien
    Digitale Medien
    Oxford UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 55 (2002), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: The authors would like to thank Gerald Hosp and Hannelore Weck-Hannemann for valuable comments and suggestions. The usual disclaimer applies.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 68
    Digitale Medien
    Digitale Medien
    Oxford UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 55 (2002), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: I wish to thank Friedrich Schneider, University of Linz, and Anne van Aaken, Humboldt-University Berlin, for their very helpful comments on this paper. Special thanks also go to Stephan Meier, University of Zurich, for helping me revise the paper.
    Materialart: Digitale Medien
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  • 69
    Digitale Medien
    Digitale Medien
    Oxford UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 55 (2002), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: I thank Mauro Baranzini, Matthias Benz and Roberto Scazzieri for detailed comments and helpful suggestions. I also enjoyed comments from many other participants at the Lugano Conference. Back in Witten, Birger Priddat gave valuable feedback.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 70
    Digitale Medien
    Digitale Medien
    Oxford UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 55 (2002), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: We are grateful to Dennis Mueller, Friedrich Schneider and Gerhard Schwarz for their extensive and detailed comments, and to Matthias Benz, Petr Chmelik, Beat Gygi, Reto Jegen, Stephan Meier, Juan Schmid, Alois Stutzer and Silika Tereshchenko for their helpful remarks on earlier versions of this paper.
    Materialart: Digitale Medien
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  • 71
    Digitale Medien
    Digitale Medien
    Oxford UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 55 (2002), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: A first draft of this paper was written while the authors were with the Institute for Advanced Study, Berlin. They would like to thank its staff for its immense hospitality and Dieter Grimm, Larry Lessig, Rico Maggi, Dieter Sadowski, and Janes Sustersic for illuminating discussions of some of the ideas contained in this paper.
    Materialart: Digitale Medien
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  • 72
    Digitale Medien
    Digitale Medien
    Oxford UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 55 (2002), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 73
    Digitale Medien
    Digitale Medien
    Oxford UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 55 (2002), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 74
    Digitale Medien
    Digitale Medien
    Oxford UK and Boston, USA : Blackwell Publishing Ltd.
    Kyklos 55 (2002), S. 0 
    ISSN: 1467-6435
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Sociologie , Wirtschaftswissenschaften
    Notizen: We are grateful to participants in the conference and the editors of KYKLOS for helpful comments.
    Materialart: Digitale Medien
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