Center-of-mass effects on the quasi-hole spectroscopic factors in the 16O(e,e'p) reaction

The spectroscopic factors for the low-lying quasi-hole states observed in the 16O(e,e'p)15N reaction are reinvestigated with a variational Monte Carlo calculation for the structure of the initial and final nucleus. A computational error in a previous report is rectified. It is shown that a proper treatment of center-of-mass motion does not lead to a reduction of the spectroscopic factor for $p$-shell quasi-hole states, but rather to a 7% enhancement. This is in agreement with analytical results obtained in the harmonic oscillator model. The center-of-mass effect worsens the discrepancy between present theoretical models and the experimentally observed single-particle strength. We discuss the present status of this problem, including some other mechanisms that may be relevant in this respect.Comment: 14 pages, no figures, uses Revtex, to be published in Phys. Rev. C 58 (1998

Сербська книжка ХІХ століття у Львівській науковій бібліотеці ім. В. Стефаника (за матеріалами фонду відділу рідкісної книги)

UBUlink(opens in a new window)|Entitled full text(opens in a new window)|View at Publisher(opens in a new window)| In recent years the number and frequency of high-impact floods have increased and climate change effects are expected to increase flood risks even more. The European Union (EU) has recently established the Floods Directive as a framework for the assessment and management of these risks. The aim of this article is to explore factors that have hampered or stimulated the implementation process of the Floods Directive in the Netherlands, from its establishment in 2007 until January 2013. During this period, the first requirements of the Floods Directive had to be implemented, while the second and third obligations were to be in an advanced stage. Following a literature review of policy implementation theories and a content analysis of the Floods Directive, we have studied the implementation processes in the Dutch part of the Meuse and Rhine-West catchments. Perceptions of interviewees and survey respondents were used to identify influential factors. Our research shows that although the implementation process in the Netherlands is on schedule, it is iterative and complex. Various constraining and stimulating factors, affecting the implementation process, are distinguished. The article concludes with some suggestions for improving the further implementation of the Floods Directive

Schiff Theorem and the Electric Dipole Moments of Hydrogen-Like Atoms

The Schiff theorem is revisited in this work and the residual $P$- and $T$-odd electron--nucleus interaction, after the shielding takes effect, is completely specified. An application is made to the electric dipole moments of hydrogen-like atoms, whose qualitative features and systematics have important implication for realistic paramagnetic atoms.Comment: 3 pages. Contribution to PANIC05, Particles and Nuclei International Conference, Santa Fe, New Mexico, Oct. 24-28, 200

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Because of climate change, extreme weather events and urban sprawl, urban areas have to deal with increasing flood risks. It is argued, both in literature and in practice that these risks can no longer be dealt with by focusing solely on flood defences (building dikes, dams, embankments etc.). Actors at various levels (international, European, national as well as regional) wish for and make efforts at a diversification of Flood Risk Management Strategies (FRMSs). There is currently debate, both within European countries and at EU level, about the potential additional role to be played by flood prevention measures such as pro-active spatial planning (building permits), flood mitigation (e.g. urban green infrastructures, adaptive buildings), flood preparation and flood recovery. It is generally argued that a diversification of FRMSs can make urban agglomerations more resilient to flood risks. However, the realisation of broadening of FRMSs leads to governance challenges. Whereas flood defence is often institutionalised in a highly state-led governance arrangement (centralized or decentralized mode of governance) with a strong role for the water sector, this is much less the case for the other FRMSs. Pro-active spatial planning asks for integration between water management and spatial planning, often in combination with involvement of private parties and civil society actors. Flood mitigation, preparation and recovery are also often institutionalised via various forms of public-private governance or self-governance. On top of this, pleas are made to link these various governance arrangements together in order to align the FRMSs, requiring even more coordination, or meta-governance. It is however not clear under which conditions such meta-governance can be successful. The aim of this presentation is to explore a) the conditions that enable a successful diversification of FRMSs, and b) how meta-governance challenges are currently being addressed in the Netherlands and the UK. First, we will structure the debates in relevant literature by the development of a classification scheme of governance challenges. Second, we will elaborate this scheme for a diversification of FRMSs from flood defence towards flood prevention, mitigation, preparation and recovery. Third, we will reflect on how the Netherlands and England successfully address these meta-governance challenges. These cases show that while diversification practices may be complicated, conditions under which such a diversification may take place can be created. Future comparative empirical research is needed though to further refine these conditions and we therefore conclude our paper with a research agenda

Перлина дерев’яного зодчества та її рятівники

Церкву Різдва Пресвятої Богородиці жителі Тулинець здавна звели на вершині одного з пагорбів. Вони хотіли, щоб їхня святиня сягала неба. І сьогодні вона виринає, немов диво перед зором проїжджаючого селом у напрямку до Дніпра

Recurrent governance challenges in the implementation and alignment of flood risk management strategies: a review

In Europe increasing flood risks challenge societies to diversify their Flood Risk Management Strategies (FRMSs). Such a diversification implies that actors not only focus on flood defence, but also and simultaneously on flood risk prevention, mitigation, preparation and recovery. There is much literature on the implementation of specific strategies and measures as well as on flood risk governance more generally. What is lacking, though, is a clear overview of the complex set of governance challenges which may result from a diversification and alignment of FRM strategies. This paper aims to address this knowledge gap. It elaborates on potential processes and mechanisms for coordinating the activities and capacities of actors that are involved on different levels and in different sectors of flood risk governance, both concerning the implementation of individual strategies and the coordination of the overall set of strategies. It identifies eight overall coordination mechanisms that have proven to be useful in this respect

Recurrent Governance Challenges in the Implementation and Alignment of Flood Risk Management Strategies: a Review

In Europe increasing flood risks challenge societies to diversify their Flood Risk Management Strategies (FRMSs). Such a diversification implies that actors not only focus on flood defence, but also and simultaneously on flood risk prevention, mitigation, preparation and recovery. There is much literature on the implementation of specific strategies and measures as well as on flood risk governance more generally. What is lacking, though, is a clear overview of the complex set of governance challenges which may result from a diversification and alignment of FRM strategies. This paper aims to address this knowledge gap. It elaborates on potential processes and mechanisms for coordinating the activities and capacities of actors that are involved on different levels and in different sectors of flood risk governance, both concerning the implementation of individual strategies and the coordination of the overall set of strategies. It identifies eight overall coordination mechanisms that have proven to be useful in this respect