| 1. |
- Sguazzin, M., et al.
(author)
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Indirect measurements of neutron -induced reaction cross sections at heavy -ion storage rings
- 2023
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In: 15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022. - 2100-014X. ; 284
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Conference paper (peer-reviewed)abstract
- Neutron-induced reaction cross sections of unstable nuclei are essential for understanding the synthesis of heavy elements in stars and for applications in nuclear technology. However, their measurement is very complicated due to the radioactivity of the targets involved. We propose to circumvent this problem by using the surrogate reaction method in inverse kinematics, where the nucleus formed in the neutroninduced reaction of interest is produced by a reaction involving a radioactive heavy -ion beam and a stable, light target nucleus. The probabilities as a function of the compound -nucleus excitation energy for y -ray emission, neutron emission and fission, which can be measured with the surrogate reaction, are particularly useful to constrain model parameters and to obtain more accurate predictions of the neutron-induced reaction cross sections of interest. Yet, the full development of the surrogate method is hampered by numerous longstanding target issues, which can be solved by combining surrogate reactions with the unique and largely unexplored possibilities at heavy -ion storage rings. In this contribution, we describe the developments we are carrying out to measure for the first time simultaneously y-ray emission, neutron emission and fission probabilities at the storage rings of the GSI/FAIR facility. In particular, we will present the first results of the proof of principle experiment, which we performed in June 2022 at the Experimental Storage Ring (ESR)
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| 2. |
- Sguazzin, M., et al.
(author)
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Indirect measurements of neutron-induced reaction cross sections at storage rings
- 2023
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In: NUCLEAR PHYSICS IN ASTROPHYSICS - X, NPA-X 2022. - : EDP Sciences. - 2100-014X. ; 279
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Conference paper (peer-reviewed)abstract
- Neutron-induced reaction cross sections of unstable nuclei are essential for understanding the synthesis of heavy elements in stars. However, their measurement is very difficult due to the radioactivity of the targets involved. We propose to circumvent this problem by using for the first time the surrogate reaction method in inverse kinematics at heavy-ion storage rings. In this contribution, we describe the developments we have done to perform surrogate-reaction studies at the storage rings of GSI/FAIR. In particular, we present the first results of the proof of principle experiment, which we conducted recently at the Experimental Storage Ring (ESR).
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| 3. |
- Sguazzin, M., et al.
(author)
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Determining neutron-induced reaction cross sections through surrogate reactions at storage rings
- 2023
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In: Journal of Physics: Conference Series. - 1742-6588 .- 1742-6596. ; 2586:1
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Conference paper (peer-reviewed)abstract
- Determining the cross sections of neutron-induced reactions on short-lived nuclei is imperative to rate calculations in stellar nucleosynthesis and applications of nuclear physics. It is also an immense experimental challenge due to the radioactivity of the targets involved. Our goal is to circumvent this obstacle by using surrogate reactions in inverse kinematics at the heavy-ion storage rings of GSI/FAIR. We present here preliminary results from the first proof of principle experiment, where a beam of 208Pb impinged on a H2 gas jet target in the Experimental Storage Ring (ESR).
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| 4. |
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| 5. |
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| 6. |
- Thomsen, J, et al.
(author)
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Optical Doppler tomography for monitoring vascularization during photodynamic therapy of skin cancer lesions
- 2008
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In: BIOPHOTONICS: PHOTONIC SOLUTIONS FOR BETTER HEALTH CARE. - : SPIE. - 1996-756X .- 0277-786X. - 9780819471895 ; 6991
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Conference paper (peer-reviewed)abstract
- We investigate vascular changes during Photodynamic therapy (PDT) of skin tumors using optical Doppler tomography (ODT). The effect of vascular shut down on tumor destruction is currently not known, and to optimize treatment it is relevant to investigate this issue further. Optical Doppler tomography is capable of measuring blood flow in biological tissue down to 1-2 mm with sub-mm/s velocity sensitivity and micrometer spatial resolution making it suitable for blood flow measurements in the skin. We demonstrate the ability of detecting blood flow in the human skin using non-interstitial ODT to preserve the non-invasiveness. In general a very limited blood flow activity was observed in normal skin and around skin tumors making monitoring of changes difficult. We suggest solutions to a number of practical issues such as sampling errors and natural fluctuations in flow activity for future work.
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| 7. |
- Bogdan, Cristian, et al.
(author)
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Generating an Abstract User Interface from a Discourse Model Inspired by Human Communication
- 2008
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In: Proceedings of the 41st Annual Hawaii International Conference on System Sciences. ; , s. 36-46
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Conference paper (peer-reviewed)abstract
- Inspired by Human Communication Cristian Bogdan, Jürgen Falb, Hermann Kaindl, Sevan Kavaldjian, Roman Popp, Helmut Horacek, Edin Arnautovic and Alexander Szep Vienna University of Technology, Institute of Computer Technology A 1040 Vienna, Austria {bogdan, falb, kaindl, kavaldjian, popp, horacek, arnautovic, szep}@ict.tuwien.ac.at Abstract Programming user interfaces is hard, error-prone and expensive, but recent advances allow generating them from interaction design models. We present an approach for modeling interaction design that is inspired by human com- munication. Our interaction design models are discourse models, more precisely models of dialogues. They are based on theories of human communication and should, therefore, be more understandable to humans than programs imple- menting user interfaces. The main ingredients of our mod- els are communicative acts (Speech Act Theory), which are connected as adjacency pairs (Conversation Analysis) and via RST relations (Rhetorical Structure Theory). While RST provides useful means for modeling discourse in the sense of monologue, a dialogue results from connecting monologues via adjacency pairs. This paper presents a new metamodel that integrates these approaches. Based on it, we show how abstract user interfaces can be generated from such dis- course models. In a nutshell, we generate finite-state ma- chinery and employ rules devised by us to map parts of a discourse model to abstract widgets.
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| 8. |
- Bogdan, Cristian, et al.
(author)
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Modeling of interaction design by end users through discourse modelling
- 2008
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In: 13th International Conference on Intelligent User Interfaces 2008, IUI'08. - New York, NY, USA : ACM. ; , s. 305-308
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Conference paper (peer-reviewed)abstract
- End users of software typically have to let someone else develop it and its user interface, or to learn to design and to program it themselves. Especially user interfaces developed by someone else may not fit well the given task. Designing and programming is hard and takes a lot of effort in general, and even more so for people not especially trained or experienced. Therefore, we propose end-user development of user interfaces through a new approach and interface for discourse modeling. End users may themselves model an interaction design as a discourse (in the sense of a dialogue between human and computer). From such an interaction design, eventually a user interface is to be generated automatically by a tool. As a consequence, end-user development becomes end-user modeling instead of programming.
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| 9. |
- Falb, J., et al.
(author)
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A discourse model for interaction design based on theories of human communication
- 2006
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In: CHI '06 extended abstracts on Human factors in computing systems. - New York, NY, USA : ACM.
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Conference paper (peer-reviewed)abstract
- Most current models of interaction design build on scenarios and task analysis. We think that interaction design should be more along the lines of communication between humans. With this motivation, our paper presents a new approach to modeling interaction design based on insights from theories of human communication. From such discourse models, we aim for automated generation of user interfaces.
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| 10. |
- Kaindl, H., et al.
(author)
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Robot-Supported Cooperative Work : A Shared-Shopping Scenario
- 2011
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In: System Sciences (HICSS), 2011 44th Hawaii International Conference on. - 9780769542829 ; , s. 5718472-
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Conference paper (peer-reviewed)abstract
- Computer-support cooperative work has been studied extensively and achieved applications that are widely useful. However, there was not much emphasis on support through robots for cooperative work. So, there is no deep understanding of what is needed to support tasks that involve individually moving communication partners and for which the physical context is relevant. This work shows an example of robot-supported cooperative work, where two robots communicate with each other to indirectly support communication between their human users. This example is a shared-shopping scenario. For its realization, we make use of high-level discourse models both for specifying communication between a robot shopping cart and its human user, and between two robot carts. The emerging communication from such intertwined discourses supports a shared (shopping) task of their two human users, who collaborate based on the shopping list shared in this way. Such support is important in a setting where the physical context is relevant, e.g., the vicinity to products.
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