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36 Research products, page 1 of 4

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  • Publication . Report . 2019
    English
    Authors: 
    Szprot, Jakub; Arpagaus, Brigitte; Ciula, Arianna; Clivaz, Claire; Gabay, Simon; Honegger, Matthieu; Hughes, Lorna; Immenhauser, Beat; Jakeman, Neil; Lhotak, Martin; +8 more
    Publisher: HAL CCSD
    Country: France
    Project: EC | DESIR (731081)

    This report provides information about activities and progress towards establishing DARIAH membership in six countries: the Czech Republic, Finland, Israel, Spain, Switzerland, and the UK, which took place between July and December 2019. Previous activities were described in detail in the D3.2 - Regularly Monitor Country-Specific Progress in Enabling New DARIAH Membership. During the project lifetime, the Czech Republic joined DARIAH ERIC; in other countries, collaboration with DARIAH has been greatly strengthened and significant progress regarding DARIAH membership has been achieved. The report also outlines the next steps in the accession processes, building on the results of the DESIR project.

  • Open Access English
    Authors: 
    Karlheinz Mörth; Laurent Romary; Gerhard Budin; Daniel Schopper;
    Publisher: HAL CCSD
    Country: France
    Project: FWF | Arabic in the Middle Atla... (P 21722)

    International audience; Academic dictionary writing is making greater and greater use of the TEI Guidelines’ dictionary module. And as increasing numbers of TEI dictionaries become available, there is an ever more palpable need to work towards greater interoperability among dictionary writing systems and other language resources that are needed by dictionaries and dictionary tools. In particular this holds true for the crucial role that statistical data obtained from language resources play in lexicographic workflow—a role that also has to be reflected in the model of the data produced in these workflows. Presenting a range of current projects, the authors address two main questions in this area: How can the relationship between a dictionary and other language resources be conceptualized, irrespective of whether they are used in the production of the dictionary or to enrich existing lexicographic data? And how can this be documented using the TEI Guidelines? Discussing a variety of options, this paper proposes a customization of the TEI dictionary module that tries to respond to the emerging requirements in an environment of increasingly intertwined language resources.

  • English
    Authors: 
    Tahko, Tuuli; Zehavi, Ora; Lhotak, Martin; Romanova, Natasha; Clivaz, Claire; Ros, Salvador; Raciti, Marco;
    Publisher: HAL CCSD
    Country: France
    Project: EC | Locus Ludi (741520), EC | DESIR (731081)

    The DESIR project sets out to strengthen the sustainability of DARIAH and firmly establish it as a long-term leader and partner within arts and humanities communities. The project was designed to address six core infrastructural sustainability dimensions and one of these was dedicated to training and education, which is also one of the four pillars identified in the DARIAH Strategic Plan 2019-2026. In the framework of Work Package 7: Teaching, DESIR organised dedicated workshops in the six DARIAH accession countries (Czech Republic, Finland, Israel, Spain, Switzerland and the United Kingdom) to introduce them to the DARIAH infrastructure and related services, and to develop methodological research skills. The topic of each workshop was decided by accession countries representatives according to the training needs of the national communities of researchers in the (Digital) Humanities. Training topics varied greatly: on the one hand, some workshops had the objective to introduce participants to specific methodological research skills; on the other hand, a different approach was used, and some events focused on the infrastructural role of training and education. The workshops organised in the context of Work Package 7: Teaching are listed below:• CZECH REPUBLIC: “A series of fall tutorials 2019 organized by LINDAT/CLARIAHCZ, tutorial #3 on TEI Training”, November 28, 2019, Prague;• FINLAND: “Reuse & sustainability: Open Science and social sciences and humanities research infrastructures”, 23 October 2019, Helsinki;• ISRAEL: “Introduction to Text Encoding and Digital Editions”, 24 October 2019, Haifa;• SPAIN: “DESIR Workshop: Digital Tools, Shared Data, and Research Dissemination”, 3 July 2019, Madrid;• SWITZERLAND: “Sharing the Experience: Workflows for the Digital Humanities”, 5-6 December 2019, Neuchâtel;• UNITED KINGDOM: “Research Software Engineering for Digital Humanities: Role of Training in Sustaining Expertise”, 9 December, London.

  • Polish
    Authors: 
    Costis, Dallas; Chatzidiakou, Nephelie; Maryl, Maciej; Benardou, Agiatis; Clivaz, Claire; Cunningham, John; Dabek, Meredith; Garrido, Patricia; Gonzalez-Blanco, Elena; Hadalin, Jurij; +19 more
    Publisher: HAL CCSD
    Country: France

    Najważniejsze wyniki europejskiego sondażu praktyk badawczych oraz potrzeb cyfrowych w humanistyce i naukach o sztuce, przeprowadzonego przez grupę roboczą DARIAH Digital Methods and Practices Observatory (DiMPO). Badanie jest efektem współpracy europejskich badaczy z różnych krajów w ramach Grupy Roboczej DiMPO. Badanie zostało pomyślana jako ponadregionalny sondaż podłużny, przeprowadzany co kilka lat online w krajach europejskich. Jego celem jest dostarczenie opartego na danych przeglądu praktyk badawczych, potrzeb i postaw europejskich badaczy z nauk humanistycznych wobec zasobów cyfrowych, metod i narzędzi, w perspektywie przestrzennej i czasowej. Wyniki pierwszego sondażu (zakończonego w marcu 2015) zostaną zaprezentowane w wieloautorskim raporcie, który zawiera analizy zbiorcze i porównawcze oraz pięć raportów narodowych. Kolejne badanie planowane jest na 2017-2018. Więcej informacji: bit.ly/scholarlypracticesPrzekład na polski: Maciej Maryl (Centrum Humanistyki Cyfrowej Instytutu Badań Literackich PAN)

  • Open Access English
    Authors: 
    Partzsch, Henriette;
    Publisher: Universidad Nacional de Educacion a Distancia
    Country: United Kingdom

    ‘Salvage’ evokes complex dynamics of loss, recovery and value, in such contexts\ud as waste management or shipwreck and maritime law. Similar dynamics, often\ud triggered by a collective or individual experience of a void or an absence, motivate\ud and inform much research into the history of women’s writing. The present article\ud explores, from the point of view of literary studies, the effects of understanding\ud research into the history of women’s writing as a salvage operation. This metaphor\ud bestows on the material studied the ambiguous status of remains. While\ud hindering the full integration of women’ s writing in more traditional accounts of\ud the literary past, the understanding of surviving material as remains can become\ud the starting point for constructing new, inclusive approaches to literary history.\ud This reframing of the problem is possible thanks to recent developments in the\ud Humanities, with an increasing interest in models and theories that allow us\ud to better understand complex and dynamic phenomena. In order to illustrate\ud the possibilities of this approach, the article draws on a brief analysis of nineteenth-century Spanish fashion magazines.

  • Publication . Part of book or chapter of book . 2017
    Open Access English
    Authors: 
    Hughes, Lorna;
    Publisher: Sapienza Università Editrice
    Country: United Kingdom

    No abstract available.

  • Open Access English
    Authors: 
    Magdalena Matysek; Stephanie Evers; Marshall K. Samuel; Sofie Sjögersten;
    Publisher: Springer Verlag
    Country: United Kingdom

    AbstractTropical peatlands are currently being rapidly cleared and drained for the establishment of oil palm plantations, which threatens their globally significant carbon sequestration capacity. Large-scale land conversion of tropical peatlands is important in the context of greenhouse gas emission factors and sustainable land management. At present, quantification of carbon dioxide losses from tropical peatlands is limited by our understanding of the relative contribution of heterotrophic and autotrophic respiration to net peat surface CO2 emissions. In this study we separated heterotrophic and autotrophic components of peat CO2 losses from two oil palm plantations (one established in ‘2000’ and the other in 1978, then replanted in ‘2006’) using chamber-based emissions sampling along a transect from the rooting to non-rooting zones on a peatland in Selangor, Peninsular Malaysia over the course of 3 months (June–August, 2014). Collar CO2 measurements were compared with soil temperature and moisture at site and also accompanied by depth profiles assessing peat C and bulk density. The soil respiration decreased exponentially with distance from the palm trunks with the sharpest decline found for the plantation with the younger palms with overall fluxes of 1341 and 988 mg CO2 m−2 h−1, respectively, at the 2000 and 2006 plantations, respectively. The mean heterotrophic flux was 909 ± SE 136 and 716 ± SE 201 mg m−2 h−1 at the 2000 and 2006 plantations, respectively. Autotrophic emissions adjacent to the palm trunks were 845 ± SE 135 and 1558 ± SE 341 mg m−2 h−1 at the 2000 and 2006 plantations, respectively. Heterotrophic CO2 flux was positively related to peat soil moisture, but not temperature. Total peat C stocks were 60 kg m−2 (down to 1 m depth) and did not vary among plantations of different ages but SOC concentrations declined significantly with depth at both plantations but the decline was sharper in the second generation 2006 plantation. The CO2 flux values reported in this study suggest a potential for very high carbon (C) loss from drained tropical peats during the dry season. This is particularly concerning given that more intense dry periods related to climate change are predicted for SE Asia. Taken together, this study highlights the need for careful management of tropical peatlands, and the vulnerability of their carbon storage capability under conditions of drainage.

  • Open Access
    Authors: 
    Julian D. Richards; Kieron Niven; Stuart Jeffrey;
    Publisher: Springer London
    Country: United Kingdom

    It is essential that we develop effective systems for the management and preservation of digital heritage data. This chapter outlines the key issues surrounding access, sharing and curation, and describes current efforts to establish research infrastructures in a number of countries. It aims to provide a detailed overview of the issues involved in the creation, ingest, preservation and dissemination of 3D datasets in particular. The chapter incorporates specific examples from past and present Archaeology Data Service (ADS) projects and highlights the recent work undertaken by the ADS and partners to specify standards and workflows in order to aid the preservation and reuse of 3D datasets.

  • Publication . Preprint . Article . 2017 . Embargo End Date: 01 Jan 2017
    Open Access
    Authors: 
    Collaboration, INDIGO-DataCloud; Salomoni, Davide; Campos, Isabel; Gaido, Luciano; de Lucas, Jesus Marco; Solagna, Peter; Gomes, Jorge; Matyska, Ludek; Fuhrman, Patrick; Hardt, Marcus; +54 more
    Publisher: arXiv
    Project: EC | INDIGO-DataCloud (653549)

    This paper describes the achievements of the H2020 project INDIGO-DataCloud. The project has provided e-infrastructures with tools, applications and cloud framework enhancements to manage the demanding requirements of scientific communities, either locally or through enhanced interfaces. The middleware developed allows to federate hybrid resources, to easily write, port and run scientific applications to the cloud. In particular, we have extended existing PaaS (Platform as a Service) solutions, allowing public and private e-infrastructures, including those provided by EGI, EUDAT, and Helix Nebula, to integrate their existing services and make them available through AAI services compliant with GEANT interfederation policies, thus guaranteeing transparency and trust in the provisioning of such services. Our middleware facilitates the execution of applications using containers on Cloud and Grid based infrastructures, as well as on HPC clusters. Our developments are freely downloadable as open source components, and are already being integrated into many scientific applications. Comment: 39 pages, 15 figures.Version accepted in Journal of Grid Computing

  • Publication . Article . Preprint . 2020 . Embargo End Date: 01 Jan 2020
    Open Access
    Authors: 
    Zamani, Maryam; Tejedor, Alejandro; Vogl, Malte; Krautli, Florian; Valleriani, Matteo; Kantz, Holger;
    Publisher: arXiv

    We investigated the evolution and transformation of scientific knowledge in the early modern period, analyzing more than 350 different editions of textbooks used for teaching astronomy in European universities from the late fifteenth century to mid-seventeenth century. These historical sources constitute the Sphaera Corpus. By examining different semantic relations among individual parts of each edition on record, we built a multiplex network consisting of six layers, as well as the aggregated network built from the superposition of all the layers. The network analysis reveals the emergence of five different communities. The contribution of each layer in shaping the communities and the properties of each community are studied. The most influential books in the corpus are found by calculating the average age of all the out-going and in-coming links for each book. A small group of editions is identified as a transmitter of knowledge as they bridge past knowledge to the future through a long temporal interval. Our analysis, moreover, identifies the most disruptive books. These books introduce new knowledge that is then adopted by almost all the books published afterwards until the end of the whole period of study. The historical research on the content of the identified books, as an empirical test, finally corroborates the results of all our analyses. Comment: 19 pages, 9 figures

Advanced search in Research products
Research products
arrow_drop_down
Searching FieldsTerms
Any field
arrow_drop_down
includes
arrow_drop_down
Include:
The following results are related to DARIAH EU. Are you interested to view more results? Visit OpenAIRE - Explore.
36 Research products, page 1 of 4
  • Publication . Report . 2019
    English
    Authors: 
    Szprot, Jakub; Arpagaus, Brigitte; Ciula, Arianna; Clivaz, Claire; Gabay, Simon; Honegger, Matthieu; Hughes, Lorna; Immenhauser, Beat; Jakeman, Neil; Lhotak, Martin; +8 more
    Publisher: HAL CCSD
    Country: France
    Project: EC | DESIR (731081)

    This report provides information about activities and progress towards establishing DARIAH membership in six countries: the Czech Republic, Finland, Israel, Spain, Switzerland, and the UK, which took place between July and December 2019. Previous activities were described in detail in the D3.2 - Regularly Monitor Country-Specific Progress in Enabling New DARIAH Membership. During the project lifetime, the Czech Republic joined DARIAH ERIC; in other countries, collaboration with DARIAH has been greatly strengthened and significant progress regarding DARIAH membership has been achieved. The report also outlines the next steps in the accession processes, building on the results of the DESIR project.

  • Open Access English
    Authors: 
    Karlheinz Mörth; Laurent Romary; Gerhard Budin; Daniel Schopper;
    Publisher: HAL CCSD
    Country: France
    Project: FWF | Arabic in the Middle Atla... (P 21722)

    International audience; Academic dictionary writing is making greater and greater use of the TEI Guidelines’ dictionary module. And as increasing numbers of TEI dictionaries become available, there is an ever more palpable need to work towards greater interoperability among dictionary writing systems and other language resources that are needed by dictionaries and dictionary tools. In particular this holds true for the crucial role that statistical data obtained from language resources play in lexicographic workflow—a role that also has to be reflected in the model of the data produced in these workflows. Presenting a range of current projects, the authors address two main questions in this area: How can the relationship between a dictionary and other language resources be conceptualized, irrespective of whether they are used in the production of the dictionary or to enrich existing lexicographic data? And how can this be documented using the TEI Guidelines? Discussing a variety of options, this paper proposes a customization of the TEI dictionary module that tries to respond to the emerging requirements in an environment of increasingly intertwined language resources.

  • English
    Authors: 
    Tahko, Tuuli; Zehavi, Ora; Lhotak, Martin; Romanova, Natasha; Clivaz, Claire; Ros, Salvador; Raciti, Marco;
    Publisher: HAL CCSD
    Country: France
    Project: EC | Locus Ludi (741520), EC | DESIR (731081)

    The DESIR project sets out to strengthen the sustainability of DARIAH and firmly establish it as a long-term leader and partner within arts and humanities communities. The project was designed to address six core infrastructural sustainability dimensions and one of these was dedicated to training and education, which is also one of the four pillars identified in the DARIAH Strategic Plan 2019-2026. In the framework of Work Package 7: Teaching, DESIR organised dedicated workshops in the six DARIAH accession countries (Czech Republic, Finland, Israel, Spain, Switzerland and the United Kingdom) to introduce them to the DARIAH infrastructure and related services, and to develop methodological research skills. The topic of each workshop was decided by accession countries representatives according to the training needs of the national communities of researchers in the (Digital) Humanities. Training topics varied greatly: on the one hand, some workshops had the objective to introduce participants to specific methodological research skills; on the other hand, a different approach was used, and some events focused on the infrastructural role of training and education. The workshops organised in the context of Work Package 7: Teaching are listed below:• CZECH REPUBLIC: “A series of fall tutorials 2019 organized by LINDAT/CLARIAHCZ, tutorial #3 on TEI Training”, November 28, 2019, Prague;• FINLAND: “Reuse & sustainability: Open Science and social sciences and humanities research infrastructures”, 23 October 2019, Helsinki;• ISRAEL: “Introduction to Text Encoding and Digital Editions”, 24 October 2019, Haifa;• SPAIN: “DESIR Workshop: Digital Tools, Shared Data, and Research Dissemination”, 3 July 2019, Madrid;• SWITZERLAND: “Sharing the Experience: Workflows for the Digital Humanities”, 5-6 December 2019, Neuchâtel;• UNITED KINGDOM: “Research Software Engineering for Digital Humanities: Role of Training in Sustaining Expertise”, 9 December, London.

  • Polish
    Authors: 
    Costis, Dallas; Chatzidiakou, Nephelie; Maryl, Maciej; Benardou, Agiatis; Clivaz, Claire; Cunningham, John; Dabek, Meredith; Garrido, Patricia; Gonzalez-Blanco, Elena; Hadalin, Jurij; +19 more
    Publisher: HAL CCSD
    Country: France

    Najważniejsze wyniki europejskiego sondażu praktyk badawczych oraz potrzeb cyfrowych w humanistyce i naukach o sztuce, przeprowadzonego przez grupę roboczą DARIAH Digital Methods and Practices Observatory (DiMPO). Badanie jest efektem współpracy europejskich badaczy z różnych krajów w ramach Grupy Roboczej DiMPO. Badanie zostało pomyślana jako ponadregionalny sondaż podłużny, przeprowadzany co kilka lat online w krajach europejskich. Jego celem jest dostarczenie opartego na danych przeglądu praktyk badawczych, potrzeb i postaw europejskich badaczy z nauk humanistycznych wobec zasobów cyfrowych, metod i narzędzi, w perspektywie przestrzennej i czasowej. Wyniki pierwszego sondażu (zakończonego w marcu 2015) zostaną zaprezentowane w wieloautorskim raporcie, który zawiera analizy zbiorcze i porównawcze oraz pięć raportów narodowych. Kolejne badanie planowane jest na 2017-2018. Więcej informacji: bit.ly/scholarlypracticesPrzekład na polski: Maciej Maryl (Centrum Humanistyki Cyfrowej Instytutu Badań Literackich PAN)

  • Open Access English
    Authors: 
    Partzsch, Henriette;
    Publisher: Universidad Nacional de Educacion a Distancia
    Country: United Kingdom

    ‘Salvage’ evokes complex dynamics of loss, recovery and value, in such contexts\ud as waste management or shipwreck and maritime law. Similar dynamics, often\ud triggered by a collective or individual experience of a void or an absence, motivate\ud and inform much research into the history of women’s writing. The present article\ud explores, from the point of view of literary studies, the effects of understanding\ud research into the history of women’s writing as a salvage operation. This metaphor\ud bestows on the material studied the ambiguous status of remains. While\ud hindering the full integration of women’ s writing in more traditional accounts of\ud the literary past, the understanding of surviving material as remains can become\ud the starting point for constructing new, inclusive approaches to literary history.\ud This reframing of the problem is possible thanks to recent developments in the\ud Humanities, with an increasing interest in models and theories that allow us\ud to better understand complex and dynamic phenomena. In order to illustrate\ud the possibilities of this approach, the article draws on a brief analysis of nineteenth-century Spanish fashion magazines.

  • Publication . Part of book or chapter of book . 2017
    Open Access English
    Authors: 
    Hughes, Lorna;
    Publisher: Sapienza Università Editrice
    Country: United Kingdom

    No abstract available.

  • Open Access English
    Authors: 
    Magdalena Matysek; Stephanie Evers; Marshall K. Samuel; Sofie Sjögersten;
    Publisher: Springer Verlag
    Country: United Kingdom

    AbstractTropical peatlands are currently being rapidly cleared and drained for the establishment of oil palm plantations, which threatens their globally significant carbon sequestration capacity. Large-scale land conversion of tropical peatlands is important in the context of greenhouse gas emission factors and sustainable land management. At present, quantification of carbon dioxide losses from tropical peatlands is limited by our understanding of the relative contribution of heterotrophic and autotrophic respiration to net peat surface CO2 emissions. In this study we separated heterotrophic and autotrophic components of peat CO2 losses from two oil palm plantations (one established in ‘2000’ and the other in 1978, then replanted in ‘2006’) using chamber-based emissions sampling along a transect from the rooting to non-rooting zones on a peatland in Selangor, Peninsular Malaysia over the course of 3 months (June–August, 2014). Collar CO2 measurements were compared with soil temperature and moisture at site and also accompanied by depth profiles assessing peat C and bulk density. The soil respiration decreased exponentially with distance from the palm trunks with the sharpest decline found for the plantation with the younger palms with overall fluxes of 1341 and 988 mg CO2 m−2 h−1, respectively, at the 2000 and 2006 plantations, respectively. The mean heterotrophic flux was 909 ± SE 136 and 716 ± SE 201 mg m−2 h−1 at the 2000 and 2006 plantations, respectively. Autotrophic emissions adjacent to the palm trunks were 845 ± SE 135 and 1558 ± SE 341 mg m−2 h−1 at the 2000 and 2006 plantations, respectively. Heterotrophic CO2 flux was positively related to peat soil moisture, but not temperature. Total peat C stocks were 60 kg m−2 (down to 1 m depth) and did not vary among plantations of different ages but SOC concentrations declined significantly with depth at both plantations but the decline was sharper in the second generation 2006 plantation. The CO2 flux values reported in this study suggest a potential for very high carbon (C) loss from drained tropical peats during the dry season. This is particularly concerning given that more intense dry periods related to climate change are predicted for SE Asia. Taken together, this study highlights the need for careful management of tropical peatlands, and the vulnerability of their carbon storage capability under conditions of drainage.

  • Open Access
    Authors: 
    Julian D. Richards; Kieron Niven; Stuart Jeffrey;
    Publisher: Springer London
    Country: United Kingdom

    It is essential that we develop effective systems for the management and preservation of digital heritage data. This chapter outlines the key issues surrounding access, sharing and curation, and describes current efforts to establish research infrastructures in a number of countries. It aims to provide a detailed overview of the issues involved in the creation, ingest, preservation and dissemination of 3D datasets in particular. The chapter incorporates specific examples from past and present Archaeology Data Service (ADS) projects and highlights the recent work undertaken by the ADS and partners to specify standards and workflows in order to aid the preservation and reuse of 3D datasets.

  • Publication . Preprint . Article . 2017 . Embargo End Date: 01 Jan 2017
    Open Access
    Authors: 
    Collaboration, INDIGO-DataCloud; Salomoni, Davide; Campos, Isabel; Gaido, Luciano; de Lucas, Jesus Marco; Solagna, Peter; Gomes, Jorge; Matyska, Ludek; Fuhrman, Patrick; Hardt, Marcus; +54 more
    Publisher: arXiv
    Project: EC | INDIGO-DataCloud (653549)

    This paper describes the achievements of the H2020 project INDIGO-DataCloud. The project has provided e-infrastructures with tools, applications and cloud framework enhancements to manage the demanding requirements of scientific communities, either locally or through enhanced interfaces. The middleware developed allows to federate hybrid resources, to easily write, port and run scientific applications to the cloud. In particular, we have extended existing PaaS (Platform as a Service) solutions, allowing public and private e-infrastructures, including those provided by EGI, EUDAT, and Helix Nebula, to integrate their existing services and make them available through AAI services compliant with GEANT interfederation policies, thus guaranteeing transparency and trust in the provisioning of such services. Our middleware facilitates the execution of applications using containers on Cloud and Grid based infrastructures, as well as on HPC clusters. Our developments are freely downloadable as open source components, and are already being integrated into many scientific applications. Comment: 39 pages, 15 figures.Version accepted in Journal of Grid Computing

  • Publication . Article . Preprint . 2020 . Embargo End Date: 01 Jan 2020
    Open Access
    Authors: 
    Zamani, Maryam; Tejedor, Alejandro; Vogl, Malte; Krautli, Florian; Valleriani, Matteo; Kantz, Holger;
    Publisher: arXiv

    We investigated the evolution and transformation of scientific knowledge in the early modern period, analyzing more than 350 different editions of textbooks used for teaching astronomy in European universities from the late fifteenth century to mid-seventeenth century. These historical sources constitute the Sphaera Corpus. By examining different semantic relations among individual parts of each edition on record, we built a multiplex network consisting of six layers, as well as the aggregated network built from the superposition of all the layers. The network analysis reveals the emergence of five different communities. The contribution of each layer in shaping the communities and the properties of each community are studied. The most influential books in the corpus are found by calculating the average age of all the out-going and in-coming links for each book. A small group of editions is identified as a transmitter of knowledge as they bridge past knowledge to the future through a long temporal interval. Our analysis, moreover, identifies the most disruptive books. These books introduce new knowledge that is then adopted by almost all the books published afterwards until the end of the whole period of study. The historical research on the content of the identified books, as an empirical test, finally corroborates the results of all our analyses. Comment: 19 pages, 9 figures