Search results for "systems"
showing 10 items of 11952 documents
High precision numerical approach for Davey–Stewartson II type equations for Schwartz class initial data
2020
We present an efficient high-precision numerical approach for Davey–Stewartson (DS) II type equa- tions, treating initial data from the Schwartz class of smooth, rapidly decreasing functions. As with previous approaches, the presented code uses discrete Fourier transforms for the spatial dependence and Driscoll’s composite Runge–Kutta method for the time dependence. Since DS equations are non-local, nonlinear Schrödinger equations with a singular symbol for the non-locality, standard Fourier methods in practice only reach accuracy of the order of 10−6or less for typical examples. This was previously demonstrated for the defocusing integrable case by comparison with a numerical approach for …
Post-it
2020
The history of the invention of post-it, the famous small piece of yellow paper with a re-adherable strip of glue, help us see how designing can be a way of redesigning more than a creation ex nihilo. A designer is who works on the meaning of things, focusing on the relations an artifact creates with humans and non humans. Standing in front of an object, then, the question changes: not what is design but when.
Com afecta la crisi al sistema de Serveis Socials
2012
The economic crisis is affecting people and societies in a different way depending on their initial situation. As far as Social Services are concerned in the Valencian Community, an analysis needs to be made of this system as it was when the crisis first emerged. Its structure is deficient and involves overlaps, in which schemes have been replaced with individual assistance, payment of subsidies takes too long and in which subjective rights, stemming from the Personal Autonomy and Care for Dependency Law and the Law on Citizens' Guaranteed Income, are poorly applied. The values crisis precedes the economic and financial crisis, which is why any possibilities of facing up to these have to se…
Some Investigations on Similarity Measures Based on Absent Words
2019
In this paper we investigate similarity measures based on minimal absent words, introduced by Chairungsee and Crochemore in [1]. They make use of a length-weighted index on a sample set corresponding to the symmetric difference M(x)ΔM(y) of the minimal absent words M(x) and M(y) of two sequences x and y, respectively. We first propose a variant of this measure by choosing as a sample set a proper subset (x, y) of M(x)ΔM(y), which appears to be more appropriate for distinguishing x and y. From the algebraic point of view, we prove that (x, y) is the base of the ideal generated by M(x)ΔM(y). We then remark that such measures are able to recognize whether the sequences x and y share a common s…
Modular Service Design of Information Technology-Enabled Services
2022
The literature has proposed ways to modularize information-technology-enabled services (ITeS) with limited success. We argue that applying design principles (DPs) can address this gap and revitalize the service modularization literature. With a qualitative research study, we develop exemplar DPs and a set of prioritized DPs for ITeS. We contribute to the literature by demonstrating how complex service systems, specifically ITeS, can be modularly designed. Our DPs show how different ITeS design elements or service attribute combinations impact the outcome-driven design of service experience. Based on the findings, we present a modular service design framework and a service design method tha…
Deep-learning based reconstruction of the shower maximum X max using the water-Cherenkov detectors of the Pierre Auger Observatory
2021
The atmospheric depth of the air shower maximum $X_{\mathrm{max}}$ is an observable commonly used for the determination of the nuclear mass composition of ultra-high energy cosmic rays. Direct measurements of $X_{\mathrm{max}}$ are performed using observations of the longitudinal shower development with fluorescence telescopes. At the same time, several methods have been proposed for an indirect estimation of $X_{\mathrm{max}}$ from the characteristics of the shower particles registered with surface detector arrays. In this paper, we present a deep neural network (DNN) for the estimation of $X_{\mathrm{max}}$. The reconstruction relies on the signals induced by shower particles in the groun…
Development of different nanosystems for drugs and siRNA delivery
Cancer is one of the leading causes of death in the world. Over the past several decades, the development of engineered nanosystems for targeted drug delivery have received great attention thanks to their possibility to overcome the limitations of classical cancer chemotherapy including poor solubility, targeting incapability, nonspecific action and, consequently, systemic toxicity. In this contest, four different models of nanocarriers have been analysed and compared for their capacity to target tumour tissue and to release the therapeutic agent in a controlled way: INU-EDA-P,C-DOXO; PHEA-EDA-P,C-DOXO; PVP-siRNA and RGO-siRNA. Inulin and PHEA were conjugated to the antineoplastic drug doxo…
Image inpainting using directional wavelet packets originating from polynomial splines
2020
The paper presents a new algorithm for the image inpainting problem. The algorithm is using a recently designed versatile library of quasi-analytic complex-valued wavelet packets (qWPs) which originate from polynomial splines of arbitrary orders. Tensor products of 1D qWPs provide a diversity of 2D qWPs oriented in multiple directions. For example, a set of the fourth-level qWPs comprises 62 different directions. The properties of the presented qWPs such as refined frequency resolution, directionality of waveforms with unlimited number of orientations, (anti-)symmetry of waveforms and windowed oscillating structure of waveforms with a variety of frequencies, make them efficient in image pro…
Time resolved emission at 1.3 μm of a single InAs quantum dot by using a tunable fibre Bragg grating
2013
Photoluminescence and time resolved photoluminescence from single metamorphic InAs/GaAs quantum dots (QDs) emitting at 1.3 mu m have been measured by means of a novel fibre-based characterization set-up. We demonstrate that the use of a wavelength tunable fibre Bragg grating filter increases the light collection efficiency by more than one order of magnitude as compared to a conventional grating monochromator. We identified single charged exciton and neutral biexciton transitions in the framework of a random population model. The QD recombination dynamics under pulsed excitation can be understood under the weak quantum confinement potential limit and the interaction between carriers at the …
The system of protected areas as the core element in a new vision of the Metropolitan City of Palermo
2022
Un processo di urbanizzazione può certamente essere considerato una delle più significative alterazioni antropiche del sistema ambientale in un territorio. Il presente studio vuole comprendere le caratteristiche spaziali della crescita urbana e i suoi impatti sulle componenti ambientali nella Città Metropolitana di Palermo, un'area in cui i livelli di consumo di suolo inedificato e di pregio, e le conseguenti forme di frammentazione ambientale e territoriale, rischiano di compromettere non solo il valore paesaggistico-ambientale dei territori coinvolti ma anche la loro identità. Partendo da queste premesse, questo contributo esplora il rapporto di reciprocità tra ambiente costruito e territ…