In this study, we present a statistical forecasting framework and assess its efficacy using a ran... more In this study, we present a statistical forecasting framework and assess its efficacy using a range of established machine learning algorithms for predicting Particulate Matter (PM) concentrations in the Arctic, specifically in Pallas (FI), Reykjavik (IS), and Tromso (NO). Our framework leverages historical ground measures and 24-hour predictions from 9 models provided by the Copernicus Atmosphere Monitoring Service (CAMS) to provide PM predictions for the following 24 hours. Furthermore, we compare the performance of various memory cells based on artificial neural networks (ANN), including recurrent neural networks (RNNs), gated recurrent units (GRUs), long short-term memory networks (LSTMs), echo state networks (ESNs), and windowed multi-layer perceptrons (MLPs), which are commonly employed in time series forecasting tasks. Irrespective of the chosen memory cell type, our results demonstrate that the proposed framework consistently outperforms the CAM models in terms of mean squar...
This paper provides a state of the art of contemporary Digital Twins (DTs) projects for urban pla... more This paper provides a state of the art of contemporary Digital Twins (DTs) projects for urban planning at an international level. The contribution investigates the evolution of the DT concept and contextualises this tool within the scientific-cultural debate, highlighting the interconnection between global policies and local needs/wishes. Specifically, six case studies of DTs are compared, illustrating their application, content, technological infrastructure, and priority results. The projects presented provide an overview of the existing DT typologies, focusing on the evaluative/prefigurative use and the limits/potential of the tool in light of the socio-health, climate, and environmental crises. Reflections on DT reveal, on the one hand, its potential role in supporting decision-making and participatory processes and, on the other, the potential utopian trend of data-driven planning encouraged by public–private investments in the smart city/twin city sector. In conclusion, the stu...
The study of the properties of cosmic structures in the universe is one of the most fascinating s... more The study of the properties of cosmic structures in the universe is one of the most fascinating subject of the modern cosmology research. Far from being predicted, the large scale structure of the matter distribution is a very recent discovery, which continuosly exhibits new features and issues. We have faced such topic along two directions; from one side we have studied the correlation properties of the cosmic structures, that we have found substantially different from the commonly accepted ones. From the other side, we have studied the statistical properties of the very simplified system, in the attempt to capture the essential ingredients of the formation of the observed strucures.The study of the properties of cosmic structures in the universe is one of the most fascinating subject of the modern cosmology research. Far from being predicted, the large scale structure of the matter distribution is a very recent discovery, which continuosly exhibits new features and issues. We have...
Comment on the paper by L. Guzzo ... F. Sylos Labini 1,2,3 , M. Montuori 1 ... 1 Dipartimento di ... more Comment on the paper by L. Guzzo ... F. Sylos Labini 1,2,3 , M. Montuori 1 ... 1 Dipartimento di Fisica, Universit`a di Roma “La Sapienza” P.le A. Moro 2, I-00185 Roma, Italy and INFM, Sezione di Roma 1 ... 2 Dépt. de Physique Théorique, Université de Gen`eve 24, Quai E. Ansermet, CH-1211 Gen`eve, Switzerland ... 3 Observatoire de Paris DEMIRM 61, Rue de l'Observatoire 75014 Paris, France ... Abstract This comment is in response to the paper by L. Guzzo recently appeared in “New Astronomy” related to our work. The subject of the discussion ...
The authors first introduce the basic concepts of fractal geometry and the methods of correlation... more The authors first introduce the basic concepts of fractal geometry and the methods of correlation analysis. The main body of the paper discusses extensively the application of fractal analysis to galaxy redshift surveys and the derived three-dimensional distribution of galaxies in the universe. The authors consider at length the important issue that the scale of the largest inhomogeneities is comparable with the extent of the surveys in which they are detected. These surveys probe scales from 100 h-1-200 h-1 Mpc for wide angle surveys ...
This comment is in response to the paper by L. Guzzo recently appeared in``New Astronomy'&#x... more This comment is in response to the paper by L. Guzzo recently appeared in``New Astronomy''related to our work. The subject of the discussion concerns the correlation properties of galaxy distribution in the available 3-d samples. There is a general agreement that galaxy structures exhibit fractal properties, at least up to some scale. However the presence of an eventual crossover towards homogenization, as well as the exact value of the fractal dimension, are still matter of debate. Here we briefly summarize our point of ...
We present the e-TidalGCs project, aimed at modeling and predicting the extra-tidal features surr... more We present the e-TidalGCs project, aimed at modeling and predicting the extra-tidal features surrounding all Galactic globular clusters for which 6D phase-space information, masses, and sizes are available (currently numbering 159 globular clusters). We focus the analysis and presentation of the results on the distribution of extra-tidal material on the sky, as well as on the different structures found at different heliocentric distances. We emphasize the wide variety of morphologies found: beyond the canonical tidal tails, our models reveal that the extra-tidal features generated by globular clusters take a wide variety of shapes, from thin and elongated shapes to thick and complex halo-like structures. We also compare some of the most well-studied stellar streams found around Galactic globular clusters to our model predictions, namely, those associated with the clusters NGC 3201, NGC 4590, NGC 5466, and Pal 5. Additionally, we investigate how the distribution and extension in the ...
Comment on the paper by L. Guzzo ... F. Sylos Labini 1,2,3 , M. Montuori 1 ... 1 Dipartimento di ... more Comment on the paper by L. Guzzo ... F. Sylos Labini 1,2,3 , M. Montuori 1 ... 1 Dipartimento di Fisica, Universit`a di Roma “La Sapienza” P.le A. Moro 2, I-00185 Roma, Italy and INFM, Sezione di Roma 1 ... 2 Dépt. de Physique Théorique, Université de Gen`eve 24, Quai E. Ansermet, CH-1211 Gen`eve, Switzerland ... 3 Observatoire de Paris DEMIRM 61, Rue de l'Observatoire 75014 Paris, France ... Abstract This comment is in response to the paper by L. Guzzo recently appeared in “New Astronomy” related to our work. The subject of the discussion ...
We present the results of an extensive series of high-performance simulations of the evolution of... more We present the results of an extensive series of high-performance simulations of the evolution of self-gravitating systems with periodic boundary conditions. The main aim of the project is to investigate the role of gravitation and of initial conditions and boundary conditions into the following evolution toward a metastable equilibrium, in a way such to distinguish the role of the various ingredients in the overall dynamics. In particular, we compare the evolution of spatially infinite self-gravitating systems embedded in an expanding universe with that of systems in a static frame. We discuss the differences and the similarities in several statistical quantities, as the density profiles of clusters and the two point autocorrelation function.
This paper focuses on the statistical properties of wild-land fires and, in particular, investiga... more This paper focuses on the statistical properties of wild-land fires and, in particular, investigates if spread dynamics relates to simple invasion model. The fractal dimension and lacunarity of three fire scars classified from satellite imagery are analysed. Results indicate that the burned clusters behave similarly to percolation clusters on boundaries and look denser in their core. We show that Dynamical Percolation reproduces this behaviour and can help to describe the fire evolution. By mapping fire dynamics onto the percolation models, the strategies for fire control might be improved.
Erosion by flowing water is one of the major forces shaping the surface of Earth. Studies in the ... more Erosion by flowing water is one of the major forces shaping the surface of Earth. Studies in the last decade have shown, in particular, that the drainage region of rivers, where water is collected, exhibits scale invariant features characterized by exponents that are the same for rivers around the world. Here we show that from the data obtained by the MOLA altimeter of the Mars Global Surveyor one can perform the same analysis for mountain sides on Mars. We then show that in some regions fluid erosion might have played a role in the present martian landscape.
In this study, we present a statistical forecasting framework and assess its efficacy using a ran... more In this study, we present a statistical forecasting framework and assess its efficacy using a range of established machine learning algorithms for predicting Particulate Matter (PM) concentrations in the Arctic, specifically in Pallas (FI), Reykjavik (IS), and Tromso (NO). Our framework leverages historical ground measures and 24-hour predictions from 9 models provided by the Copernicus Atmosphere Monitoring Service (CAMS) to provide PM predictions for the following 24 hours. Furthermore, we compare the performance of various memory cells based on artificial neural networks (ANN), including recurrent neural networks (RNNs), gated recurrent units (GRUs), long short-term memory networks (LSTMs), echo state networks (ESNs), and windowed multi-layer perceptrons (MLPs), which are commonly employed in time series forecasting tasks. Irrespective of the chosen memory cell type, our results demonstrate that the proposed framework consistently outperforms the CAM models in terms of mean squar...
This paper provides a state of the art of contemporary Digital Twins (DTs) projects for urban pla... more This paper provides a state of the art of contemporary Digital Twins (DTs) projects for urban planning at an international level. The contribution investigates the evolution of the DT concept and contextualises this tool within the scientific-cultural debate, highlighting the interconnection between global policies and local needs/wishes. Specifically, six case studies of DTs are compared, illustrating their application, content, technological infrastructure, and priority results. The projects presented provide an overview of the existing DT typologies, focusing on the evaluative/prefigurative use and the limits/potential of the tool in light of the socio-health, climate, and environmental crises. Reflections on DT reveal, on the one hand, its potential role in supporting decision-making and participatory processes and, on the other, the potential utopian trend of data-driven planning encouraged by public–private investments in the smart city/twin city sector. In conclusion, the stu...
The study of the properties of cosmic structures in the universe is one of the most fascinating s... more The study of the properties of cosmic structures in the universe is one of the most fascinating subject of the modern cosmology research. Far from being predicted, the large scale structure of the matter distribution is a very recent discovery, which continuosly exhibits new features and issues. We have faced such topic along two directions; from one side we have studied the correlation properties of the cosmic structures, that we have found substantially different from the commonly accepted ones. From the other side, we have studied the statistical properties of the very simplified system, in the attempt to capture the essential ingredients of the formation of the observed strucures.The study of the properties of cosmic structures in the universe is one of the most fascinating subject of the modern cosmology research. Far from being predicted, the large scale structure of the matter distribution is a very recent discovery, which continuosly exhibits new features and issues. We have...
Comment on the paper by L. Guzzo ... F. Sylos Labini 1,2,3 , M. Montuori 1 ... 1 Dipartimento di ... more Comment on the paper by L. Guzzo ... F. Sylos Labini 1,2,3 , M. Montuori 1 ... 1 Dipartimento di Fisica, Universit`a di Roma “La Sapienza” P.le A. Moro 2, I-00185 Roma, Italy and INFM, Sezione di Roma 1 ... 2 Dépt. de Physique Théorique, Université de Gen`eve 24, Quai E. Ansermet, CH-1211 Gen`eve, Switzerland ... 3 Observatoire de Paris DEMIRM 61, Rue de l'Observatoire 75014 Paris, France ... Abstract This comment is in response to the paper by L. Guzzo recently appeared in “New Astronomy” related to our work. The subject of the discussion ...
The authors first introduce the basic concepts of fractal geometry and the methods of correlation... more The authors first introduce the basic concepts of fractal geometry and the methods of correlation analysis. The main body of the paper discusses extensively the application of fractal analysis to galaxy redshift surveys and the derived three-dimensional distribution of galaxies in the universe. The authors consider at length the important issue that the scale of the largest inhomogeneities is comparable with the extent of the surveys in which they are detected. These surveys probe scales from 100 h-1-200 h-1 Mpc for wide angle surveys ...
This comment is in response to the paper by L. Guzzo recently appeared in``New Astronomy'&#x... more This comment is in response to the paper by L. Guzzo recently appeared in``New Astronomy''related to our work. The subject of the discussion concerns the correlation properties of galaxy distribution in the available 3-d samples. There is a general agreement that galaxy structures exhibit fractal properties, at least up to some scale. However the presence of an eventual crossover towards homogenization, as well as the exact value of the fractal dimension, are still matter of debate. Here we briefly summarize our point of ...
We present the e-TidalGCs project, aimed at modeling and predicting the extra-tidal features surr... more We present the e-TidalGCs project, aimed at modeling and predicting the extra-tidal features surrounding all Galactic globular clusters for which 6D phase-space information, masses, and sizes are available (currently numbering 159 globular clusters). We focus the analysis and presentation of the results on the distribution of extra-tidal material on the sky, as well as on the different structures found at different heliocentric distances. We emphasize the wide variety of morphologies found: beyond the canonical tidal tails, our models reveal that the extra-tidal features generated by globular clusters take a wide variety of shapes, from thin and elongated shapes to thick and complex halo-like structures. We also compare some of the most well-studied stellar streams found around Galactic globular clusters to our model predictions, namely, those associated with the clusters NGC 3201, NGC 4590, NGC 5466, and Pal 5. Additionally, we investigate how the distribution and extension in the ...
Comment on the paper by L. Guzzo ... F. Sylos Labini 1,2,3 , M. Montuori 1 ... 1 Dipartimento di ... more Comment on the paper by L. Guzzo ... F. Sylos Labini 1,2,3 , M. Montuori 1 ... 1 Dipartimento di Fisica, Universit`a di Roma “La Sapienza” P.le A. Moro 2, I-00185 Roma, Italy and INFM, Sezione di Roma 1 ... 2 Dépt. de Physique Théorique, Université de Gen`eve 24, Quai E. Ansermet, CH-1211 Gen`eve, Switzerland ... 3 Observatoire de Paris DEMIRM 61, Rue de l'Observatoire 75014 Paris, France ... Abstract This comment is in response to the paper by L. Guzzo recently appeared in “New Astronomy” related to our work. The subject of the discussion ...
We present the results of an extensive series of high-performance simulations of the evolution of... more We present the results of an extensive series of high-performance simulations of the evolution of self-gravitating systems with periodic boundary conditions. The main aim of the project is to investigate the role of gravitation and of initial conditions and boundary conditions into the following evolution toward a metastable equilibrium, in a way such to distinguish the role of the various ingredients in the overall dynamics. In particular, we compare the evolution of spatially infinite self-gravitating systems embedded in an expanding universe with that of systems in a static frame. We discuss the differences and the similarities in several statistical quantities, as the density profiles of clusters and the two point autocorrelation function.
This paper focuses on the statistical properties of wild-land fires and, in particular, investiga... more This paper focuses on the statistical properties of wild-land fires and, in particular, investigates if spread dynamics relates to simple invasion model. The fractal dimension and lacunarity of three fire scars classified from satellite imagery are analysed. Results indicate that the burned clusters behave similarly to percolation clusters on boundaries and look denser in their core. We show that Dynamical Percolation reproduces this behaviour and can help to describe the fire evolution. By mapping fire dynamics onto the percolation models, the strategies for fire control might be improved.
Erosion by flowing water is one of the major forces shaping the surface of Earth. Studies in the ... more Erosion by flowing water is one of the major forces shaping the surface of Earth. Studies in the last decade have shown, in particular, that the drainage region of rivers, where water is collected, exhibits scale invariant features characterized by exponents that are the same for rivers around the world. Here we show that from the data obtained by the MOLA altimeter of the Mars Global Surveyor one can perform the same analysis for mountain sides on Mars. We then show that in some regions fluid erosion might have played a role in the present martian landscape.
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