48 results on '"Lars Kjerulf Petersen"'
Search Results
2. Understanding Controversies in Urban Climate Change Adaptation. A case study of the role of homeowners in the process of climate change adaptation in Copenhagen
- Author
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Nina Baron and Lars Kjerulf Petersen
- Subjects
Climate change adaptation ,homeowners ,assemblage theory ,controversies ,sustainable urban drainage systems (SUDS) ,water management ,Science ,Technology - Abstract
This article explores the controversies that exist in urban climate change adaptation and how these controversies influence the role of homeowners in urban adaptation planning. A concrete ‘Sustainable Urban Drainages System’ (SUDS) project in a housing cooperative in Copenhagen has been used as a case study, thereby investigating multiple understandings of urban climate change adaptation. Several different perspectives are identified with regard to what are and what will become the main climate problems in the urban environment as well as what are considered to be the best responses to these problems. Building on the actor-network inspired theory of ‘urban green assemblages’ we argue that at least three different assemblages can be identified in urban climate change adaptation. Each assemblage constitutes and connects problems and responses differently and thereby involve homeowners in different ways. As climate change is a problem of unknown character and outcome in the future, we argue that it can be problematic if one way of constituting urban climate change adaptation becomes dominant, in which case some climate problems and adaptation options may become less influential, even though the enrolment of these could contribute to a more resilient city. Furthermore, the case study from Copenhagen also shows that the influence and involvement of homeowners might be reduced if the conception of future climate problems becomes too restricted. The result would be that the potential benefits of involving urban citizens in defining and responding to problems related to climate change would be lost.
- Published
- 2015
3. Understanding Controversies in Urban Climate Change Adaptation. A case study of the role of homeowners in the process of climate change adaptation in Copenhagen
- Author
-
Nina Baron and Lars Kjerulf Petersen
- Subjects
Climate change adaptation ,homeowners ,assemblage theory ,controversies ,sustainable urban drainage systems (SUDS) ,water management ,Science ,Technology - Abstract
This article explores the controversies that exist in urban climate change adaptation and how these controversies influence the role of homeowners in urban adaptation planning. A concrete ‘Sustainable Urban Drainages System’ (SUDS) project in a housing cooperative in Copenhagen has been used as a case study, thereby investigating multiple understandings of urban climate change adaptation. Several different perspectives are identified with regard to what are and what will become the main climate problems in the urban environment as well as what are considered to be the best responses to these problems. Building on the actor-network inspired theory of ‘urban green assemblages’ we argue that at least three different assemblages can be identified in urban climate change adaptation. Each assemblage constitutes and connects problems and responses differently and thereby involve homeowners in different ways. As climate change is a problem of unknown character and outcome in the future, we argue that it can be problematic if one way of constituting urban climate change adaptation becomes dominant, in which case some climate problems and adaptation options may become less influential, even though the enrolment of these could contribute to a more resilient city. Furthermore, the case study from Copenhagen also shows that the influence and involvement of homeowners might be reduced if the conception of future climate problems becomes too restricted. The result would be that the potential benefits of involving urban citizens in defining and responding to problems related to climate change would be lost.
- Published
- 2016
- Full Text
- View/download PDF
4. Mussel farm location in the Baltic Sea – community acceptance or distrust
- Author
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Lars Kjerulf Petersen and Nardine Stybel
- Subjects
AQUACULTURE ,VALUES ,Social acceptance ,COASTAL ,PLACE ATTACHMENT ,PARTICIPATION ,Management, Monitoring, Policy and Law ,Aquatic Science ,Oceanography ,Aqua culture ,ENERGY ,LESSONS ,Mussel cultivation ,Community acceptance ,Facility siting ,MARINE ,CONFLICT ,RESIDENTS - Abstract
In this article we report key findings from an explorative mixed methods study of community approaches to the location of mussel cultivation facilities – and hence to the use of marine and coastal space – in Denmark and Germany. While mussel farms did not appear to provoke high levels of open protest and were met with approval among some stakeholders, the study did observe notable concerns among year-round and seasonal residents in the affected communities. These concerns include visual disruption of the waterscape, competition for space, and generation of waste. Of further relevance for the issue of community acceptance, the study discovered how collective experiences with pollution from fish farms can engender local disapproval of mussel farms, in spite of the latter's capacity for mitigating pollution. One potential lesson from this result could be that local publics have difficulty distinguishing between various types of aquaculture and their impact on the environment. Another lesson is that the assemblage of concerns that can affect any facility siting do not only relate to the effects of the facility itself. Concerns also relate to the already experienced effects of other types of facilities in other locations and to the broader history and collective memory of concrete interactions with the landscape in that specific area, including the place attachments and social (dis)trust these interactions have generated. This knowledge will help decision-makers develop community-oriented involvement strategies as a mandatory part of any siting and management of mussel farms and other aquaculture facilities.
- Published
- 2022
- Full Text
- View/download PDF
5. Media’s role in pro-environmental practice changes – proposing an ANT perspective
- Author
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Lars Kjerulf Petersen
- Subjects
medieeffekter ,010504 meteorology & atmospheric sciences ,Sociology and Political Science ,Actor–network theory ,practices ,media_common.quotation_subject ,Geography, Planning and Development ,media effects ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,miljøbekymring ,01 natural sciences ,Sociology ,Content (Freudian dream analysis) ,aktør-netværksteori ,0105 earth and related environmental sciences ,media_common ,omstilling ,Ecology ,Point (typography) ,environmental concern ,Constitution ,Actor-network theory ,Transition (fiction) ,Perspective (graphical) ,transition ,CONSUMPTION ,Epistemology ,praksisteori - Abstract
The content of media texts should be considered as a critical factor in the constitution, maintenance and transition of practices. That is the outset and basic point of this article, which suggests an actor-network theoretical approach in order to provide a better understanding of the role media can play in pro-environmental practice changes. There is an exchange between articulations in media texts and performances of social practice, and the study of meaning content in media texts and media-practice interactions is therefore useful in the analysis of societal transition processes. From a critical discussion of conventional media effect theories, the article proceeds to its main objective of presenting ANT as a useful approach in the analysis of media-practice interactions. It is suggested that texts and the meaning units within them can be conceived as actors, which connect to other human and non-human actors in and beyond media texts.
- Published
- 2019
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6. Towards a new understanding of information effects on discourses and practices: The role of online newspapers in sustainable household changes
- Author
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Lars Kjerulf Petersen and Martina Ferrucci
- Subjects
climate change ,business.industry ,online newspapers ,Media effects ,General Medicine ,Sociology ,practice change ,Public relations ,sustainability ,business ,Newspaper - Abstract
Climate change mitigation is one of the most important societal challenges of our time, but it is often inaccessible to direct human experience. Hence, climate change and related issues are largely constituted in the public mind from media narrations, which have the potential to push people towards new sustainable practices. The objective of this article is to identify how media, in this case online newspapers, can affect pro-environmental practice changes. Firstly, we will outline a conceptual framework connecting mediatization theories to practice theories. Secondly, we will present empirical findings for establishing connections between online news effects and sustainable practice changes and their respective recurring patterns and models.
- Published
- 2019
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7. Screening of DNA-Encoded Small Molecule Libraries inside a Living Cell
- Author
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Charlotte Andersen, Iolanda Micco, Daniel Madsen, Peter Blakskjaer, Amaya Alzu, Jacob Andersen, Ole Kristensen, Lars Kjerulf Petersen, Charlotta G. Folkesson, Frank Abildgaard Sløk, Carlos Azevedo, Allan Beck Christensen, and Nils Jakob Vest Hansen
- Subjects
African clawed frog ,Somatic cell ,Cell ,Xenopus ,Acetate-CoA Ligase ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Catalysis ,Mitogen-Activated Protein Kinase 14 ,Small Molecule Libraries ,chemistry.chemical_compound ,Xenopus laevis ,Colloid and Surface Chemistry ,medicine ,Animals ,Humans ,biology ,Chemistry ,Dock5 ,General Chemistry ,DNA ,biology.organism_classification ,0104 chemical sciences ,Cell biology ,medicine.anatomical_structure ,biology.protein ,Oocytes ,Target protein - Abstract
DNA-encoded small molecule libraries (DELs) have facilitated the discovery of novel modulators of many different therapeutic protein targets. We report the first successful screening of a multimillion membered DEL inside a living cell. We demonstrate a novel method using oocytes from the South African clawed frog Xenopus laevis. The large size of the oocytes of 1 μL, or 100 000 times bigger than a normal somatic cell, permits simple injection of DELs, thus resolving the fundamental problem of delivering DELs across cell membranes for in vivo screening. The target protein was expressed in the oocytes fused to a prey protein, to allow specific DNA labeling and hereby discriminate between DEL members binding to the target protein and the endogenous cell proteins. The 194 million member DEL was screened against three pharmaceutically relevant protein targets, p38α, ACSS2, and DOCK5. For all three targets multiple chemical clusters were identified. For p38α, validated hits with single digit nanomolar potencies were obtained. This work demonstrates a powerful new approach to DEL screening, which eliminates the need for highly purified active target protein and which performs the screening under physiological relevant conditions and thus is poised to increase the DEL amenable target space and reduce the attrition rates.
- Published
- 2021
8. Engaging with nature through the dwelling practices in garden landscapes
- Author
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Lars Kjerulf Petersen
- Subjects
Cultural Studies ,05 social sciences ,Geography, Planning and Development ,0211 other engineering and technologies ,0507 social and economic geography ,affordance theory ,021107 urban & regional planning ,Environmental ethics ,02 engineering and technology ,Empirical research ,affect ,gardening ,Sociology ,practice theory ,050703 geography ,Dwelling ,biodiversity - Abstract
Based on an empirical study in Copenhagen Denmark, this article investigates whether and how a more diverse nature can be integrated in the dwelling practices of garden owners and users. Is concern for biodiversity part of the engagements inherent in gardening practices? And are such engagements integrated in the embodied competences of garden owners? Drawing on and discussing the theoretical approaches applied in affordance theory, Tim Ingold’s dwelling perspective, relational geography and practice theory the article analyses the affordances and affects that are maintained in common gardening practices and how these practices sustain or hinder the integration of a broader variety of species in suburban gardens. The study finds that concern for biodiversity and a deeper care for wildlife do not appear to play a significant role in gardening practices. But concern for wildlife and biodiversity does have a latent presence among the affects, conceptions and ideals that are – or potentially could be – enacted in the constitution of gardens landscapes. Based on its empirical findings and theoretical discussions, the article furthermore suggests that we need to consider how secondary experiences and media representations are an integral part of the co-constitution of landscape and dwelling.
- Published
- 2021
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9. How Italian Newspapers Narrate Climate Change. The Role of Media Representations in the Cultivation of Sustainable Collective Imaginary
- Author
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Martina Ferrucci and Lars Kjerulf Petersen
- Subjects
Economics and Econometrics ,sustainable development ,Eurobarometer ,Geography, Planning and Development ,Global warming ,Climate change ,Environmental ethics ,media effects ,Management, Monitoring, Policy and Law ,Environmental Science (miscellaneous) ,Development ,Newspaper ,climate change ,Climate change mitigation ,online newpapers ,Sustainable management ,Political science ,Sustainability ,The Imaginary - Abstract
Global warming represents one of the most important societal challenges of our time, but it is often inaccessible to direct human experience. On the contrary, it is largely constituted in the public mind from media narrations. Indeed, media have the power to catch people’s attention and to create collective imaginaries on that issue. For this reason, understanding the way in which media represent climate change can be a strategic starting point in the comprehension of sustainable collective imagination. In the European scenario, Italy symbolizes an interesting case study, not only due to the challenges of sustainable management that this country has to face, but also because, according to Eurobarometer surveys, Italians seem being not particularly concerned about climate change mitigation. Consequently, and considering the impressive development of the Internet, our research is aimed to identify the typology of climate change representation provided by the two most important Italian online newspapers and the role this representations have had on people’s sustainable concerns and narrations (through interview analysis). Our findings allow us to define similarities between media narrations and interviewees’ stories and to understand how important media representations are in raising sustainable awareness among the audiences. Keywords: Sustainability, climate change, media representation, media influence, Italy
- Published
- 2018
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10. Byens grønne struktur : Natur og miljø i bylandskabet
- Author
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Lars Kjerulf Petersen and Lars Kjerulf Petersen
- Subjects
- Urban ecology (Sociology)--Denmark--Copenhagen, Nature
- Abstract
Ofte tænker vi natur og byer som to adskilte verdener. Når vi f.eks. forestiller os København, er det formentlig menneskemylderet ned ad Strøget og ikke de grønne bugtninger langs Christianshavns bastioner eller Amager Fælled, vi ser for os. Men det grønne er også en del af bybilledet og naturen ikke bare noget, vi kan vælge at opsøge langt væk i Thy. Den er lige for næsen af os midt mellem storbyens asfalt, beton og mursten og er en lige så uundværlig del af byen som butiksgader, palæer og rådhuspladser. I Byens grønne struktur. Natur og miljø i bylandskabet fortæller forfatterne om den blågrønne strøm af natur, som løber gennem alle byer, store som små. I gårdhaverne griller vi om sommeren med vennerne, rundt om Søerne dyrker københavnerne motion året rundt, og i parkerne kigger vi på sommerfugle, solsorte og rhododendroner med vores børn. - Uden disse blågrønne skud af natur ville kun de færreste af os have lyst til at tilbringe størstedelen af vores liv i byen. Alligevel er vi ikke gode nok til at tænke by og natur sammen. Vi ødelægger levestederne for dyr og planter, og vi prioriterer en ny parkeringsplads over en gammel gårdhave. Måske lider vi under den misforståelse, at naturen kan tage vare på sig selv og ikke kræver ordentlige vækstbetingelser. I så fald er det på tide at få øjnene op for, at by og natur ikke er hinandens modsætninger - og at byen kun er værd at leve i, hvis naturen i den trives.
- Published
- 2016
11. Livsstilsbegrebet – i miljøsociologisk perspektiv
- Author
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Lars Kjerulf Petersen
- Subjects
Critical factors ,Identity (social science) ,General Materials Science ,Sociology ,Humanities - Abstract
Denne artikel tager livsstilsbegrebet op til diskussion og gør det ud fra et miljøsociologisk perspektiv, men med relevans for sociologien i almindelighed. Livsstilsbegrebet er af stor betydning i miljøsociologien – og i sociologien generelt – fordi studiet af livsstil muliggør en forståelse af samspillet mellem en række forskellige dynamikker der former alle dele af livsførelsen for individet og i en større samfundsmæssig sammenhæng. Der er imidlertid behov for at gøre op med nogle af de erkendelsesmæssige blindgyder som livsstilsbegrebet ofte ender i. Det gælder især forestillingen om livsstil som status- og identitetssignal. Frem for alene at fokusere på identitetssignalet og selvidentiteten som den kritiske parameter i livsstilen argumenterer artiklen for, at man først og fremmest skal forstå livsstil som handlemåder og praksisformer der er formet af blandt andet det kropslige, det kulturelle og det materielle. Artiklen er blevet til på baggrund af et projekt om Livsstil og Naturkvalitet i Byrummet; projektet er finansieret af Realdania og Danmarks Miljøundersøgelser. ENGELSK ABSTRACT: Lars Kjerulf Petersen: The Concept of Lifestyle – from the Perspective of Environmental Sociology The concept of lifestyle is of great significance in environmental sociology – and in sociology in general – because studies of lifestyle enable a deeper understanding of interactions between different social dynamics affecting all aspects of everyday life. This article explores the concept of lifestyle from the perspective of environmental sociology, but with relevance for sociology in general. The article argues that it is necessary to reorient lifestyle studies and redefine the concept itself. In particular, the idea of lifestyle as a signal of status and identity needs to be reconsidered. Instead of focussing on identity and signalling as the critical factors of lifestyle, the concept needs to be understood in terms of patterns of practice which are dialectically shaped by cultural, material and bodily orders. Key words: Lifestyle, environment, practice, identity, materiality.
- Published
- 2011
- Full Text
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12. Autonomy and Proximity in Household Heating Practices: the Case of Wood-Burning Stoves
- Author
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Lars Kjerulf Petersen
- Subjects
environmental concern in everyday life ,miljøhensyn i hverdagslivet ,wood burning stoves ,media_common.quotation_subject ,Energy (esotericism) ,energi og livsstil ,Energy consumption ,Management, Monitoring, Policy and Law ,Environmental economics ,Pleasure ,miljøsociologi ,lifestyle and energy consumption ,environmental sociology ,Order (exchange) ,Stove ,brændeovne ,Environmental impact assessment ,Energy supply ,Socioeconomics ,Autonomy ,media_common - Abstract
Afbrænding af træ i brændeovne og brændefyr er blevet væsentligt mere udbredt i Danmark siden midten af 1990'erne; en udvikling der medfører øget partikelforurening i boligområder med villaer og rækkehuse. Brugen af brændeovne bliver, på basis af et sociologisk studie af fænomenet, forstået i forhold til en bredere diskussion af de sociale forudsætninger for at integrere miljøhensyn i husholdningens energiforbrug og i hverdagslivet generelt. Brændefyring er, i modsætning til fx. fjernvarme, en meget decentral og også meget fysisk håndgribelig, synlig og sanselig form for boligopvarmning. Brugen af brændeovne er uafhængig af større energiforsyningssystemer. Brugere af brændeovne skal ikke alene gøre en aktiv indsats for at få varme, men gennemfører også ændringer i deres bolig for at realisere personlige strategier for opvarmning og velvære i hjemmet; strategier der både udspringer af såvel økonomiske overvejelser som forestillinger om hygge og det ideale hjem. At opvarmningsformen er decentral og den enkelte brugers eget ansvar, hvor konsekvenser i miljøet er direkte synlige og sanselige, tilskynder imidlertid ikke nødvendigvis til en integration af miljøhensyn i hverdagens praksisser. The use of wood burning stoves as a source of household heating is increasing in Denmark; a development that is causing considerable particle pollution in residential neighbourhoods. This article reports from a sociological study of stove users, the results of which is interpreted in relation to broader discussions regarding social preconditions for integrating environmental consideration into household energy consumption. Stove users practice a decentred and also more tangible and visible form of heating supply; one that is not enclosed in larger energy supply systems. Moreover, stove users alter infrastructural conditions in order to pursue personal strategies for domestic heating and comfort, personal strategies that may have their root in economic considerations or may regard the construction of homeliness and sensuous pleasure - referring in turn to broader socio-cultural values regarding the ideal home. A decentred and tangible form of heating supply, with visible effects in the environment, is however not necessarily an incentive for integrating environmental concern into domestic practices for energy consumption.
- Published
- 2008
- Full Text
- View/download PDF
13. Changing public discourse on the environment: Danish media coverage of the Rio and Johannesburg UN summits
- Author
-
Lars Kjerulf Petersen
- Subjects
Sociology and Political Science ,media_common.quotation_subject ,societal communication ,Media coverage ,Environmental Science (miscellaneous) ,Public administration ,Modernization theory ,language.human_language ,Danish ,Scale (social sciences) ,Law ,Public discourse ,Rhetoric ,environment in the media ,language ,ecological modernisation ,Sociology ,Environmental degradation ,media_common - Abstract
Environmental degradation and unsustainable development were addressed on a global scale at the UN Summits in Rio de Janeiro in 1992 and Johannesburg in 2002. This article presents analyses of Danish television coverage of these two summits and related topics viewing the media stories as exemplary cases of wider public conceptions of the environment. Over a decade rhetoric about the summits and the environment changed, the agenda changed, and key environmental issues were repackaged. These changes are further interpreted in relation to ecological modernisation and discussed as a possible development towards post-environmentalism. Already ecological modernisation can be perceived as post-environmentalist, but this article wants to suggest a downfall also for ecological modernisation as a prominent discourse and a more direct challenge to the legitimacy of environmental concern and thus a further break with environmentalism.
- Published
- 2007
- Full Text
- View/download PDF
14. Tekst- og diskursanalyse som sociologisk fremgangsmåde
- Author
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Lars Kjerulf Petersen
- Subjects
Power (social and political) ,Trace (semiology) ,Interpretation (philosophy) ,General Materials Science ,Context (language use) ,Sociology ,Meaning (existential) ,Identification (psychology) ,Social science ,Motion (physics) ,Epistemology ,Focus (linguistics) - Abstract
Text and discourse analyses as sociological pratice Text analysis must be regarded as a central component in sociological inquiry. Relations of power and domination and societal processes as such are establi¬shed and maintained through knowled¬¬ge and communication, i.e. through texts. Therefore sociology should be in¬terested in identifying the knowledge and the meanings, i.e. the discourses, that are prevalent in a society, a commu¬nity or various organisations – and in the texts of such social organisms. The purpose of this article is to argue that the identification of societal discourses, and thereby the production of sociolo¬gical insight, can be very profitably con¬ducted through text analysis. First the concept of discourse is clarified. With reference to Ricoeur and Foucault dis¬course is understood as a system of meaning and knowledge, a system that is in motion and works in multiple ways, but still has some sort of coheren¬ce. To identify discourses in a group of texts, different techniques can be appli¬ed focusing on various aspects of text structure. Through such techniques the interpretation of texts can be qualified, and a maximum of accordance between the sociological analysis and the wor¬kings in and of a text can be approa¬ched. Texts are elements in signification processes involving senders and recei¬vers and their (re)construction of mean¬ing. While it is very important to consi¬der the context of texts, there is no point in privileging the reception in significa¬tion processes when identifying mean¬ing. The only accessible trace of the sig¬nification process, i.e. the text itself, might just as well be the focus of attention.
- Published
- 2007
- Full Text
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15. Understanding Controversies in Urban Climate Change Adaptation:A case study of the role of homeowners in the process of climate change adaptation in Copenhagen
- Author
-
Lars Kjerulf Petersen and Nina Baron
- Subjects
010504 meteorology & atmospheric sciences ,Process (engineering) ,Political economy of climate change ,Copenhagen ,Climate change ,Climate change adaptation ,lcsh:A ,050905 science studies ,01 natural sciences ,water management ,Urban climate ,Political science ,homeowners ,Adaptation (computer science) ,sustainable urban drainage systems ,0105 earth and related environmental sciences ,controversies ,business.industry ,05 social sciences ,Environmental resource management ,Urban adaptation ,assemblage theory ,sustainable urban drainage systems (SUDS) ,Housing cooperative ,lcsh:General Works ,0509 other social sciences ,business - Abstract
This article explores the controversies that exist in urban climate change adaptation and how these controversies influence the role of homeowners in urban adaptation planning. A concrete ‘Sustainable Urban Drainages System’ (SUDS) project in a housing cooperative in Copenhagen has been used as a case study, thereby investigating multiple understandings of urban climate change adaptation. Several different perspectives are identified with regard to what are and what will become the main climate problems in the urban environment as well as what are considered to be the best responses to these problems. Building on the actor-network inspired theory of ‘urban green assemblages’ we argue that at least three different assemblages can be identified in urban climate change adaptation. Each assemblage constitutes and connects problems and responses differently and thereby involve homeowners in different ways. As climate change is a problem of unknown character and outcome in the future, we argue that it can be problematic if one way of constituting urban climate change adaptation becomes dominant, in which case some climate problems and adaptation options may become less influential, even though the enrolment of these could contribute to a more resilient city. Furthermore, the case study from Copenhagen also shows that the influence and involvement of homeowners might be reduced if the conception of future climate problems becomes too restricted. The result would be that the potential benefits of involving urban citizens in defining and responding to problems related to climate change would be lost.
- Published
- 2015
16. Byens grønne struktur
- Author
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Lars Kjerulf Petersen, Rasmus Ejrnæs, Gregor Levin, Anne Jensen, and Marianne Zandersen
- Published
- 2015
- Full Text
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17. Hvad er mediesociologi?
- Author
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Lars Kjerulf Petersen
- Subjects
business.industry ,Taste (sociology) ,media_common.quotation_subject ,Media studies ,Social environment ,Media relations ,Publics ,General Materials Science ,The Internet ,Sociology ,Social science ,business ,Function (engineering) ,media_common ,Meaning (linguistics) ,Theme (narrative) - Abstract
What is media sociology? The purpose of this article is to introduce some main themes in media sociology, in particular the question of the various media as particular technological milieu and media as the public. It is possible to analyze media as milieu, that is technologies that not only canalize information, but also, by the manner in which they function, form the social milieu that they are a part of. This is illustrated through analyses of television and computer/internet as media milieu. The question of the public-political as well as broader cultural public, every day life public, taste public-is also a central theme in the study of media. These publics come into being through the media. Hence one be interested in the contents of these publics, for instance the meanings, values, stories, information, rituals that are being communicated. One can also be interested in the process of construction of meanings, for instance the conditions for creation and maintenance of publics, the power relations involved in production and transmission of meaning and the reception of the meanings that are being communicated.
- Published
- 2006
- Full Text
- View/download PDF
18. Chiral switching by spontaneous conformational change in adsorbed organic molecules
- Author
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Sigrid Weigelt, Lars Kjerulf Petersen, Flemming Besenbacher, Trolle R. Linderoth, Kurt V. Gothelf, Carsten Busse, E. Rauls, and Bjørk Hammer
- Subjects
Conformational change ,Chemistry ,Stereochemistry ,Mechanical Engineering ,General Chemistry ,Condensed Matter Physics ,Organic molecules ,Catalysis ,Adsorption ,Mechanics of Materials ,Chemical physics ,Intramolecular force ,Molecule ,General Materials Science ,Enantiomer ,Quantum tunnelling - Abstract
Self-assembly of adsorbed organic molecules is a promising route towards functional surface nano-architectures, and our understanding of associated dynamic processes has been significantly advanced by several scanning tunnelling microscopy (STM) investigations. Intramolecular degrees of freedom are widely accepted to influence ordering of complex adsorbates, but although molecular conformation has been identified and even manipulated by STM, the detailed dynamics of spontaneous conformational change in adsorbed molecules has hitherto not been addressed. Molecular surface structures often show important stereochemical effects as, aside from truly chiral molecules, a large class of so-called prochiral molecules become chiral once confined on a surface with an associated loss of symmetry. Here, we investigate a model system in which adsorbed molecules surprisingly switch between enantiomeric forms as they undergo thermally induced conformational changes. The associated kinetic parameters are quantified from time-resolved STM data whereas mechanistic insight is obtained from theoretical modelling. The chiral switching is demonstrated to enable an efficient channel towards formation of extended homochiral surface domains. Our results imply that appropriate prochiral molecules may be induced (for example, by seeding) to assume only one enantiomeric form in surface assemblies, which is of relevance for chiral amplification and asymmetric heterogenous catalysis.
- Published
- 2006
- Full Text
- View/download PDF
19. Climate change or variable weather: Rethinking Danish homeowners' perceptions of floods and climate
- Author
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Nina Baron and Lars Kjerulf Petersen
- Subjects
Global and Planetary Change ,Flood myth ,business.industry ,Political economy of climate change ,Actor–network theory ,media_common.quotation_subject ,Global warming ,Environmental resource management ,Flooding (psychology) ,Climate change ,Climate change adaptation ,Tim Ingold ,flood risk ,landscape ,Geography ,Feeling ,Perception ,homeowners ,business ,media_common ,actor network theory - Abstract
Climate scenarios predict that an effect of climate change will be more areas at risk of extensive flooding. This article builds on a qualitative case study of homeowners in the flood-prone area of Lolland in Denmark and uses the theories of Tim Ingold and Bruno Latour to rethink the way we understand homeowners’ perception of climate change and local flood risk. Ingold argues that those perceptions are shaped by people’s experiences with and connections to their local landscape. People experience the local variability of the weather, and not global climate change as presented in statistical data and models. This influences the way they understand the future risks of climate change. Concurrently, with the theory of Latour, we can understand how those experiences with the local landscape are mediated by the existing water-managing technologies such as pumps and dikes. These technologies prevent the residents in Lolland from experiencing many of the changes that are already occurring and, at the same time, give them a feeling of being able to control the water to the extent that it is prevented from flooding their homes, both now and in the future. The combination of these two theoretical approaches gives new insights as to why people living in flood-prone areas are not very concerned about climate change.
- Published
- 2015
- Full Text
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20. Fourier Transform–STM: determining the surface Fermi contour
- Author
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Lars Kjerulf Petersen, Flemming Besenbacher, E. W. Plummer, and Ph. Hofmann
- Subjects
Condensed Matter::Quantum Gases ,Physics ,Radiation ,Condensed matter physics ,Fermi level ,Quantum oscillations ,Fermi surface ,Fermi energy ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Shubnikov–de Haas effect ,Electronic, Optical and Magnetic Materials ,symbols.namesake ,symbols ,Condensed Matter::Strongly Correlated Electrons ,Fermi liquid theory ,Physical and Theoretical Chemistry ,Pseudogap ,Fermi gas ,Spectroscopy - Abstract
Surface states that cross the Fermi level give rise to a surface Fermi contour, in complete analogy with the notion of a bulk Fermi surface for metals. The shape of the Fermi contour is important when discussing the screening at the surface, Fermi surface nesting, Kohn anomalies, etc. To determine the Fermi contour, the usual technique of choice has been angle-resolved photoemission. Recently, we have introduced a new and simple method for determining surface Fermi contours. It is based on a Fourier Transform of STM images obtained at low bias voltage and low temperature. Here we review the results obtained so far, and discuss the method in comparison to photoemission. Finally, we suggest that Fourier Transform–STM can be a valuable tool for studying periodicities in the electronic structure of materials, e.g. charge density waves and charge ordering.
- Published
- 2000
- Full Text
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21. A simple tight-binding model of spin–orbit splitting of sp-derived surface states
- Author
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Per Hedegård and Lars Kjerulf Petersen
- Subjects
Condensed matter physics ,Chemistry ,Point reflection ,Charge density ,Surfaces and Interfaces ,Spin–orbit interaction ,Zero field splitting ,Condensed Matter Physics ,Surfaces, Coatings and Films ,Tight binding ,Materials Chemistry ,Spin (physics) ,Electronic band structure ,Surface states - Abstract
In crystals with inversion symmetry, splitting of states due to the spin–orbit interaction is not allowed. At the surface, however, the symmetry is broken, and spin–orbit splitting becomes possible. Spin–orbit splitting has been observed experimentally for the sp-derived surface state on Au(111) [S. LaShell, B.A. McDougall, E. Jensen, Phys. Rev. Lett. 77 (1996) 3419]. We present a simple tight-binding model, which shows that the spin–orbit splitting can be described within a nearly-free-electron model, and the splitting depends on (1) the spin–orbit splitting of the atomic levels and (2) the surface potential. Furthermore, we show that the splitting of the surface state is unobservable in the surface charge density as probed with scanning tunneling microscopy.
- Published
- 2000
- Full Text
- View/download PDF
22. Noble metal surface states: deviations from parabolic dispersion
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Lukas Bürgi, Klaus Kern, Lars Kjerulf Petersen, and Harald Brune
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Chemistry ,business.industry ,Scanning tunneling spectroscopy ,chemistry.chemical_element ,Surfaces and Interfaces ,engineering.material ,Condensed Matter Physics ,Molecular physics ,Copper ,Surfaces, Coatings and Films ,law.invention ,Condensed Matter::Materials Science ,Optics ,law ,Dispersion relation ,Materials Chemistry ,engineering ,Noble metal ,Scanning tunneling microscope ,Spectroscopy ,business ,Dispersion (chemistry) ,Surface states - Abstract
Dispersion relations of the s–p derived surface state on (111) surfaces of silver and copper have been measured using low-temperature scanning tunneling microscopy and spectroscopy. For silver as well as for copper we find a significant deviation from a parabolic dispersion characteristic of free-electron-like systems. A simple tight-binding model accounts for the trends in the measured dispersions.
- Published
- 2000
- Full Text
- View/download PDF
23. Energetics and dynamics of Pt dimers on Pt(110)-(1×2)
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Erik Lægsgaard, M. Schønning, Stig Helveg, Lars Kjerulf Petersen, Sebastian Horch, Flemming Besenbacher, Trolle R. Linderoth, and Ivan Stensgaard
- Subjects
Materials science ,Chemical physics ,Energetics ,Dynamics (mechanics) - Published
- 2000
- Full Text
- View/download PDF
24. Screening waves from steps and defects on Cu(111) and Au(111) imaged with STM: Contribution from bulk electrons
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Flemming Besenbacher, Erik Lægsgaard, Lars Kjerulf Petersen, and P. Laitenberger
- Subjects
Friedel oscillations ,Physics ,Surface (mathematics) ,Condensed matter physics ,law ,Fermi surface ,Biasing ,Electron ,Scanning tunneling microscope ,Surface states ,law.invention ,Fermi Gamma-ray Space Telescope - Abstract
By studying two-dimensional (2D) Fourier transforms of scanning tunneling microscopy (FT-STM) images, we obtain information about the role of surface states versus bulk states in the screening of defects and step edges at the close-packed Cu and Au surfaces. The STM images, obtained at low temperature and low bias voltage, exhibit wave interference patterns originating from the energy-resolved Friedel oscillations of surface- state electrons created by the screening of surface defects. The FT-STM pictures directly yield images of the 2D surface Fermi contour. Here we present results for Cu(111) and Au(111) surfaces, which reveal the existence of an additional contour in the FT-STM power spectrum. This contour is related to the ``neck'' of the bulk Fermi surface as accounted for by a simple model. The results give information about the role that both bulk and surface-state electrons play in the screening of defects at or near the surface. We find that the surface-state electrons dominate the screening of step edges on Au(111).
- Published
- 1998
- Full Text
- View/download PDF
25. A traceless aryl-triazene linker for DNA-directed chemistry
- Author
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Christian Hejesen, Kurt V. Gothelf, Lars Kjerulf Petersen, and Nils Jakob Vest Hansen
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Models, Molecular ,Cleavable linker ,Hypophosphorous acid ,Base Sequence ,Stereochemistry ,Aryl ,Organic Chemistry ,DNA-directed chemsitry ,Water ,Traceless linker ,DNA ,Hydrogen-Ion Concentration ,Biochemistry ,Combinatorial chemistry ,Cycloaddition ,chemistry.chemical_compound ,chemistry ,Molecule ,Nucleic Acid Conformation ,Azide ,Physical and Theoretical Chemistry ,Triazene ,Triazenes ,Linker - Abstract
DNA-directed synthesis of encoded combinatorial libraries of small organic compounds most often involves transfer of organic building blocks from one DNA strand to another. This requires cleavable linkers to enable cleavage of the link to the original DNA strand from which the building block is transferred. Relatively few cleavable linkers are available for DNA-directed synthesis and most often they leave an amino group at the organic molecule. Here we have extended the application of 10 aryltriazenes as traceless linkers for DNA-directed synthesis. After reaction of one building block with a building block at another DNA strand the triazene linker is cleaved and reduced with hypophosphorous acid in high yield to leave the arylgroup with a hydrogen in place of the triazene i.e. without a functional group trace. It was also demonstrated that alternatively the triazene could be converted to an azide, which was used in a cycloaddition reaction. The linker is generally stable at pH >7 and could be stored for 15 several months in a freezer without significant degradation.
- Published
- 2013
- Full Text
- View/download PDF
26. The materiality of everyday practices in urban greenspace
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Lars Kjerulf Petersen
- Subjects
Practice ,lifestyle ,Empirical research ,Aesthetics ,Materiality (law) ,urban greenspace ,Actant ,Sociology ,actant function ,Management, Monitoring, Policy and Law ,Everyday life ,Socioeconomics ,materiality - Abstract
This paper investigates how urban greenspace is integrated in everyday practices of urban populations. What are the social functions that green areas serve, and how do people interact with the materiality of urban greenspace – its bio-physical structures and its nature and landscape. The paper reports from a recent empirical study in the city of Copenhagen, Denmark, and it seeks to unfold and qualify concepts of lifestyle and practice, i.e. concepts by which sociological studies can capture and understand patterns of actions in people’s daily lives and life courses. Particularly it seeks to include an understanding of the role of materiality in the analyses of social practices. Inspired by actor-network theory the paper proposes to analyse the role of urban greenspace in everyday practices as actant functions performed by the greenspace and its elements. A number of studies show that urban green areas are beneficial for human health. These studies do, however, not go into a broader understanding of the social significance of urban greenspace and its significance in people’s lives. The social functions of urban green areas are not limited to whatever good effects they have on public health. The question is also which roles green areas play in people’s lives and in the community. The study presented in this paper shows that urban green areas are included in everyday life as spaces for free time and for household flexibility. They serve a number of different social functions by providing spaces for solitude, for being together with close friends and relatives and for the experience of civic diversity. And the possibility of having experiences of nature and landscape become an integral part of urban life.
- Published
- 2013
- Full Text
- View/download PDF
27. Discursive biases of the environmental research framework DPSIR
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Lars Kjerulf Petersen, Henk Siepel, Hanne Svarstad, Dale S. Rothman, and Frank Wätzold
- Subjects
media_common.quotation_subject ,Discourse analysis ,Ecology (disciplines) ,Geography, Planning and Development ,Social constructivism ,Miljø ,Diskursanalyse ,Management, Monitoring, Policy and Law ,Environment ,south ,State (polity) ,DPSIR ,Wageningen Environmental Research ,Sociology ,Socialkonstruktivisme ,Nature and Landscape Conservation ,media_common ,Management science ,Field (Bourdieu) ,Perspective (graphical) ,Environmental research ,tool ,Forestry ,Environmental ethics ,Biodiversity ,Centrum Ecosystemen ,Centre for Ecosystem Studies ,land ,Biodiversitet ,africa ,ecology - Abstract
The Drivers–Pressures–State–Impacts–Responses (DPSIR) framework has evolved as an interdisciplinary tool to provide and communicate knowledge on the state and causal factors regarding environmental issues. Based on a social constructivist and discourse analytic perspective, this paper provides a critical examination of theoretical foundations of the DPSIR approach. We focus on the example of biodiversity, but our conclusions are relevant to other fields of environmental research. The DPSIR framework is viewed through the ‘lenses’ of four major types of discourses on biodiversity: Preservationist, Win–win, Traditionalist and Promethean. Based upon this examination, we argue that the DPSIR framework is not a tool generating neutral knowledge. Instead, application of this framework reproduces the discursive positions the applicant brings into it. We find that when applied in its traditional form to studies in the field of biodiversity, the framework is most compatible with the Preservationist discourse type and tends to favour conservationist and to neglect other positions. Thus, contrary to what is often claimed, we find that the DPSIR framework has shortcomings as a tool for establishing good communication between researchers, on the one hand, and stakeholders and policy makers on the other. The problem with the framework is the lack, so far, of efforts to find a satisfactory way of dealing with the multiple attitudes and definitions of issues by stakeholders and the general public.
- Published
- 2008
- Full Text
- View/download PDF
28. Nature as a nuisance? Ecosystem services and disservices to urban lifestyle
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Bo Normander, Lars Kjerulf Petersen, Jari Lyytimäki, and Peter Bezák
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lifestyle ,ecosystem disservices ,livsstil ,business.industry ,Environmental resource management ,Biodiversity ,byplanlægning ,urban planning ,Ecosystem services ,Environmental studies ,Geography ,Biodiversitet ,Urban planning ,Urban ecosystem ,business ,ecosystem services - Abstract
Udgivelsesdato: August The lifestyle of people living in urban areas has profound direct and indirect impacts on biodiversity. However, the role of urban lifestyle as a driving force of biodiversity change is not very well understood. This is partly because there is a gap between a social science approach focusing on lifestyle and a natural science approach focusing on biodiversity. We propose that the concept of ecological services and disservices is useful in connecting these approaches. Ecosystem services produced by urban green areas are the focus of a wide range of environmental studies, but disservices - such as safety issues in dark parks or pollen causing health problems - have gained only sporadic attention in environmental studies focused on urban ecosystems. We review and discuss different urban ecosystem disservices from a Northern European perspective. We conclude by addressing the key limitations and possibilities of the use of the concept of ecological disservices in urban biodiversity studies.
- Published
- 2008
- Full Text
- View/download PDF
29. Anchoring of organic molecules to a metal surface: HtBDC on Cu(110)
- Author
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Lars Kjerulf Petersen, M. Schunack, Ib Johannsen, E. Lægsgaard, Angelika Kühnle, Ivan Stensgaard, and Flemming Besenbacher
- Subjects
Surface (mathematics) ,Materials science ,General Physics and Astronomy ,Anchoring ,Nanotechnology ,Substrate (electronics) ,Atomic units ,law.invention ,Metal ,Adsorption ,law ,Chemical physics ,visual_art ,visual_art.visual_art_medium ,Molecule ,Scanning tunneling microscope - Abstract
The interaction of largish molecules with metal surfaces has been studied by combining the imaging and manipulation capabilities of the scanning tunneling microscope (STM). At the atomic scale, the STM results directly reveal that the adsorption of a largish organic molecule can induce a restructuring of a metal surface underneath. This restructuring anchors the molecules on the substrate and is the driving force for a self-assembly process of the molecules into characteristic molecular double rows.
- Published
- 2000
30. Imaging the surface Fermi contour on Cu(110) with scanning tunneling microscopy
- Author
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Erik Lægsgaard, Flemming Besenbacher, Lars Kjerulf Petersen, Ivan Stensgaard, and B. Schaefer
- Subjects
Condensed matter physics ,Band gap ,Chemistry ,Fermi level ,Fermi surface ,Surfaces and Interfaces ,Condensed Matter Physics ,Surfaces, Coatings and Films ,law.invention ,Brillouin zone ,symbols.namesake ,Fourier transform ,law ,Materials Chemistry ,symbols ,Scanning tunneling microscope ,Surface states ,Bloch wave - Abstract
The Cu(110) surface has two projected bulk band gaps at the edges of the surface Brillouin zone. One of the surface states in these gaps crosses the Fermi level. The corresponding two-dimensional Fermi contour has been imaged using the Fourier transform STM method. By studying the Fourier component intensity distribution, information about the Bloch wave function is extracted.
- Published
- 2000
31. Direct imaging of the two-dimensional Fermi contour: Fourier-transform STM
- Author
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Phillip Sprunger, Alexander M. Bradshaw, E. W. Plummer, Ph. Hofmann, Lars Kjerulf Petersen, Flemming Besenbacher, B. G. Briner, Hans-Peter Rust, Marcus Doering, and Erik Lægsgaard
- Subjects
Surface (mathematics) ,Physics ,Condensed Matter::Quantum Gases ,Condensed matter physics ,Fermi level ,Fermi energy ,Electron ,law.invention ,Standing wave ,symbols.namesake ,Fourier transform ,law ,Computer Science::Computer Vision and Pattern Recognition ,symbols ,Scanning tunneling microscope ,Fermi Gamma-ray Space Telescope - Abstract
Direct images of the two-dimensional Fermi contour at a surface can be generated by a Fourier transform (FT) of scanning tunneling microscopy (STM) images taken at low-bias voltages. The origins of the Fermi contour in the FT are the standing waves of electrons near the Fermi energy caused by defects in the surface. Several examples of FT-STM are presented to illustrate the simplicity of this technique. The advantages and limitations of this Fermi contour imaging technique are discussed.
- Published
- 1998
32. Dust extinction from Paschen-Balmer lines
- Author
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Lars Kjerulf Petersen, P. Gammelgaard, and T. Christensen
- Subjects
Wavelength ,symbols.namesake ,Spiral galaxy ,Chemistry ,Attenuation ,Extinction (astronomy) ,symbols ,Balmer series ,Astrophysics ,Multiplet - Abstract
We have studied the dust extinction of spiral galaxies by determing the attenuation of the emission from giant extragalactic H II regions. The aim is to push CCD observations as far into the near-IR as possible to compare the near-IR Paschen lines with blue Baimer lines separated by a wide wavelength interval including the corresponding multiplet lines P δ /H e and P γ /H δ , which originate at the same upper atomic level.
- Published
- 1996
- Full Text
- View/download PDF
33. Risk perceptions and lifestyle changes in relation to climate change adaptation in Denmark
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A Jensen, Lars Kjerulf Petersen, and Søren Steen Nielsen
- Subjects
Geography ,Relation (database) ,business.industry ,Perception ,media_common.quotation_subject ,Environmental resource management ,Climate change adaptation ,business ,Environmental planning ,media_common - Published
- 2009
- Full Text
- View/download PDF
34. Does one-dimensional (1D) adatom and cluster diffusion of Pt on the Pt(110)-(1 × 2) surface lead to 1D ripening?
- Author
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Flemming Besenbacher, Erik Lægsgaard, Sebastian Horch, Ivan Stensgaard, Lars Kjerulf Petersen, and Trolle R. Linderoth
- Subjects
Physics ,Surface diffusion ,Atomic resolution ,Annealing (metallurgy) ,Microscopy ,Late stage ,Cluster (physics) ,General Physics and Astronomy ,Nanotechnology ,Anisotropy ,Molecular physics ,Quantum tunnelling - Abstract
The technique of scanning tunnelling microscopy (STM) uniquely allows dynamic processes on surfaces to be followed directly in real space and at atomic resolution. Results for the551225 surface diffusion of Pt adatoms and clusters on the anisotropic, missing row reconstructed Pt(110)-(1 ? 2) surface are briefly reviewed. Mass transport in this system is entirely one-dimensional (1D) since, at low adatom coverage, atoms and clusters are confined to the missing row troughs. In this paper, we therefore address the question if Pt/Pt(110)-(1 ? 2) is a 1D model system to study late stage growth phenomena such as island ripening? From STM measurements, we quantify the morphology changes resulting from annealing a surface configuration with small 1D Pt islands in the missing row troughs to temperatures in the interval 369?395?K. Interestingly, the resulting increase in island sizes (ripening) cannot be accounted for by the known island and adatom mobilities within a 1D model. An explanation is provided from dynamic, time-resolved 'STM-movies' that directly reveal two novel island-mediated mechanisms for inter-trough mass transport which cause the Pt/Pt(110)-(1 ? 2) system not to be purely 1D at the higher surface coverage used in the annealing experiments.
- Published
- 2005
- Full Text
- View/download PDF
35. A fast-scanning, low- and variable-temperature scanning tunneling microscope
- Author
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Ivan Stensgaard, M. Schunack, Phillip Sprunger, Flemming Besenbacher, P B Rasmussen, E. Lægsgaard, Lars Kjerulf Petersen, B. Schaefer, and Trolle R. Linderoth
- Subjects
Materials science ,Local density of states ,business.industry ,Scanning tunneling spectroscopy ,Nanotechnology ,Spin polarized scanning tunneling microscopy ,Conductive atomic force microscopy ,Atmospheric temperature range ,Electrochemical scanning tunneling microscope ,law.invention ,Scanning probe microscopy ,law ,Optoelectronics ,Scanning tunneling microscope ,business ,Instrumentation - Abstract
The design and performance of a fast-scanning, low- and variable-temperature, scanning tunneling microscope (STM) incorporated in an ultrahigh vacuum system is described. The sample temperature can be varied from 25 to 350 K by cooling the sample using a continuous flow He cryostat and counter heating by a W filament. The sample temperature can be changed tens of degrees on a time scale of minutes, and scanning is possible within minutes after a temperature change. By means of a software implemented active drift compensation the drift rate can be as low as 1 nm/day. The STM is rigid, very compact, and of low weight, and is attached firmly to the sample holder using a bayonet-type socket. Atomic resolution on clean metal surfaces can be achieved in the entire temperature range. The performance of the instrument is further demonstrated by images of adsorbed hexa-tert-butyl-decacyclene molecules on Cu(110), by STM movies, i.e., sequential STM images with a time resolution down to 1 s/image (100×100 A2 with 256×256 pixels), of the mobility of these molecules, and finally by constant current images of standing waves in the electronic local density of states on Cu(110).
- Published
- 2001
- Full Text
- View/download PDF
36. Looking at electronic wave functions on metal surfaces
- Author
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B. G. Briner, Flemming Besenbacher, Phil Sprunger, E. Ward Plummer, Philip Hofmann, Hans-Peter Rust, Lars Kjerulf Petersen, Erik Lægsgaard, Marcus Doering, and A. M. Bradshaw
- Subjects
Physics ,Metal ,Condensed matter physics ,visual_art ,visual_art.visual_art_medium ,General Physics and Astronomy ,Wave function - Abstract
The project described here is not only a beautiful example of the visual side tophysics, it is also a beautiful example of international cooperation. The first use of the idea—to apply a Fourier transform to STM pictures to see electron waves instead of just the surface atoms—came out of a collaboration between Plummer, Sprunger and the Aarhus group headed by Besenbacher. Hofman, who had beenworking at Tennessee, took Be(1010) samples to Berlin where the images shown in this pictorial were taken. All of the participants are now preparing a paper on the use of a Fourier transform to map the Fermi contour at metal surfaces.
- Published
- 1997
- Full Text
- View/download PDF
37. Policy guidelines for implementation of mussel cultivation as a mitigation measure for coastal eutrophication in the Western Baltic Sea
- Author
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Jens Kjerulf Petersen, Daniel Taylor, Per Bergström, Anna-Lucia Buer, Miroslaw Darecki, Raphael Filippelli, Ing-Marie Gren, Berit Hasler, Andreas Holbach, Pernille Nielsen, Lars Kjerulf Petersen, Mats Lindegarth, Ivar Lund, Marie Maar, Lukas Ritzenhofen, Slawomir Sagan, Camille Saurel, Gerald Schernewski, Nardine Stybel, and Karen Timmermann
38. Tourism and recreation industries in the Baltic Sea area - How are they affected by the marine environmental state?
- Author
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Linus Hasselström, Berit Hasler, Louise Martinsen, Anders Branth Pedersen, Lars Kjerulf Petersen, Heidi Tukhanen, Kirsi Kurki, Tuija Sievänen, Anni Huhtala, Astrid Kowatsch, Alf Vanags, Ance Kaleja, Martins Kalis, Daiva Semèniènè, Rasa Sceponaviciute, Simona Daugintiene, Mikolaj Czajkowski, Agnieszka Markowska, Marta Zygmunt, Tomas Zylich, and Natalia Volchkova
39. Brud og bevægelser i den danske miljøindsats
- Author
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Jeppe Læssøe, Lars Kjerulf Petersen, Jesper Holm, Arne Remmen, and Carsten Jahn Hansen
40. Beskrivelser af marine virkemidler
- Author
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Marie Maar, Raphael Filippelli, Berit Hasler, Andreas Michael Holbach, Jens Kjerulf Petersen, Lars Kjerulf Petersen, Camille Saurel, Daniel Taylor, and Mette Termansen
41. Baltic Survey, Phase 1: Suggestions, motivations and conclusions regarding questions for the Baltic Survey. Denmark
- Author
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Berit Hasler, Anders Branth Pedersen, Louise Martinsen, Lars Kjerulf Petersen, Sisse Liv Brodersen, Maria Konrad, Anne Jensen, and Marianne Nygaard Källstrøm
42. Surface waves on NiAl(110)
- Author
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Erik Lægsgaard, Lars Kjerulf Petersen, Bjørk Hammer, Ivan Stensgaard, Flemming Besenbacher, K. Højrup Hansen, and J. Gottschalck
- Subjects
Nial ,Materials science ,Condensed matter physics ,Electronic structure ,law.invention ,Standing wave ,Condensed Matter::Materials Science ,symbols.namesake ,Fourier transform ,Surface wave ,law ,symbols ,Density functional theory ,Scanning tunneling microscope ,Anisotropy ,computer ,computer.programming_language - Abstract
We have investigated the electronic structure of the (110) surface of the NiAl ordered alloy by a combination of scanning tunneling microscopy (STM) and density functional theory band-structure calculations. We present STM images of standing waves on NiAl(110), at both room temperature and 140 K. By Fourier transforming the STM images we obtain an anisotropic surface Fermi contour containing contributions from waves with two different k vectors. Based on band-structure calculations, the origin of the two standing waves has been assigned to a surface state and to the edge of the projected bulk band.
43. Deliverable D 3.7 Scenarios for decentralised bio-waste collection chains with a waste collection database for representative situations
- Author
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Steffen Walk, Jessica Schermuly, Ina Körner, Marianne Thomsen, and Lars Kjerulf Petersen
44. Parcelhushaven - en del af byens natur
- Author
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Lars Kjerulf Petersen, Gregor Levin, Rasmus Ejrnæs, Marianne Zandersen, Anne Jensen, and Ane Kirstine Brunbjerg
45. Beskrivelser af marine virkemidler: Muslingeopdræt
- Author
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Marie Maar, Raphael Filippelli, Berit Hasler, Andreas Michael Holbach, Jens Kjerulf Petersen, Lars Kjerulf Petersen, Camille Saurel, Daniel Taylor, Mette Termansen, and Karen Timmermann
46. Økologisk modernisering på dansk
- Author
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Jesper Holm, Lars Kjerulf Petersen, Jeppe Læssøe, Arne Remmen, and Carsten Jahn Hansen
47. Beskrivelser af marine virkemidler
- Author
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Marie Maar, Raphael Filippelli, Berit Hasler, Andreas Michael Holbach, Jens Kjerulf Petersen, Lars Kjerulf Petersen, Camille Saurel, Daniel Taylor, Mette Termansen, and Karen Timmermann
48. D3.5 Survey on waste collection systems with evaluations for decentralised applications
- Author
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Dirk Manns, Jessica Schermuly, Lars Kjerulf Petersen, Veronica Martinez-Sanchez, Pierre Thiriet, Jean-Benoit Bel, Eric Dargent, Marianne Thomsen, Claudio Fontana, and Steffen Walk
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