1,256 research outputs found
Novel generation schemes for stable soliton states in optical microcavities
The excitation of Kerr optical frequency combs(OFC) is frequently non-deterministic and remains a cumbersome problem in many practical situations. While standard techniques to generate Kerr solitons in passive resonators employ a continuous wave pump, recently pulsed pumping has also been proposed. In this study we individuate and classify OFC states in a phase space defined by an experimental set of coordinates and triggered by a general super-Gaussian chirped driving field. Our numerical analysis shows how the soliton drifts caused by the phase modulation of the input field accelerate the dynamics and convergence towards a stable soliton stat
At the roots of sustainability: Mediterranean vernacular architecture
[EN] As numerous examples show, bioclimatic architecture is an historical, ancestral design practice. The whole history of architecture is marked by the search for living comfort resulting from the link with the land and the correct use of natural resources. In vernacular architecture, we also find this ‘holistic’ conception of living in which design choices (compositional, constructive, material, and technological) are deeply connected to climatic and functional issues. However, until now, studies on these typologies have usually focused more on formal aspects, leaving out sustainability ones. The spontaneous constructions of the Mediterranean area – the Sicilian dammusi, the trulli of Val d'Itria, the Sassi of Matera, the Scirocco rooms in Sicily or the houses on the Amalfi coast – are sincere, rational, and logical, and have always sought living comfort through energy and economic efficiency, even without pre-established rules or standards. For example, the absence of wood and clay, the abundance of limestone and sand, led to design the Amalfi Coast dwellings essentially of stone, abandoning tiles, bricks, and wooden floors. The structure without sharp corners results from the limestone which was not tender enough to allow a good squaring. The dammusi were built with the same stones used to reclaim the land to form the terraces on which they stood. Their domed roofs were made of stone covered with a layer of earth and a mixture of volcanic pumice as insulation, and a layer of red tuff and milk of lime as waterproofing. The paper aims to investigate these peculiar vernacular typologies to trace the remote origins of sustainability in their morphological and technological characters. This study could also trigger a reflection on strategies for the contemporary design of sustainable architecture inspired by the tradition of these climatic regions.Talenti, S.; Teodosio, A. (2022). At the roots of sustainability: Mediterranean vernacular architecture. Editorial Universitat Politècnica de València. 513-520. https://doi.org/10.4995/HERITAGE2022.2022.1562151352
Absolute continuity of the best Sobolev constant of a bounded domain
Let \lambda_{q}:=\inf{\Vert\nabla
u\Vert_{L^{p}(\Omega)}^{p}/\Vertu\Vert_{L^{q}(\Omega)}^{p}:u\in
W_{0}^{1,p}(\Omega)\setminus{0}} , where is a bounded and smooth
domain of and We prove that the function is
absolutely continuous in the closed interval $[1,p^{\star}].
Resolution of the finite Markov moment problem
We expose in full detail a constructive procedure to invert the so--called
"finite Markov moment problem". The proofs rely on the general theory of
Toeplitz matrices together with the classical Newton's relations
Lane-Emden stars, selfgravitating disks and the Sobolev inequality
We estimate the minimal mass of selfgravitating polytropic disks using the
famous Sobolev inequality. This bound resembles the well known mass formula for
Lane-Emden stars. For ideal gas with the polytropic index n = 3 the minimal
mass is not smaller than the Jeans mass. The accuracy of the estimate is
verified in a number of numerical examples. The bound works well for heavy
selfgravitating disks and is less useful for light disks.Comment: 9 pages, 2 figure
Mieniplotia scabra (Müller, 1774), another gastropod invasive species in Europe and the status of freshwater allochthonous molluscs in Greece and Europe
Mieniplotia scabra (Müller, 1774), a freshwater gastropod originating from the Indo-Pacific area, has proved to be a successful invader spreading to other parts of East Asia, Middle East, the Pacific Islands, North America and West Indies. This paper reports the first record of M. scabra from Europe, where it has become naturalized in Kos Island in Greece. This new trans-continental introduction brings to nine the number of alien freshwater molluscs species in Greece and to 30 in Europe. It is therefore given an updated snapshot on the presence of the numerous non-native fresh water species in Europe, divided by nation, an account that is currently lacking in literature and in the specific databases
My Lockdown Escape: Sparking Self-Empathy in the Context of the Covid-19 Pandemic
During the Covid-19 pandemic, research communities focused on collecting and
understanding people's behaviours and feelings to study and tackle the pandemic
indirect effects. Despite its consequences are slowly starting to fade away,
such an interest is still alive. In this article, we propose a hybrid,
gamified, story-driven data collection approach to spark self-empathy, hence
resurfacing people's past feelings. The game is designed to include a physical
board, decks of cards, and a digital application. As the player plays through
the game, they customize and escape from their lockdown room by completing
statements and answering a series of questions that define their story. The
decoration of the lockdown room and the storytelling-driven approach are
targeted at sparking people's emotions and self-empathy towards their past
selves. Ultimately, the proposed approach was proven effective in sparking and
collecting feelings, while a few improvements are still necessary
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