Search results for "solu"
showing 10 items of 7577 documents
Hybrid Learning Situation as a Challenge for Design
2016
In the paper, we address the physical learning space and focus on designing enabling settings for learning. New practices emerge from an accelerating context change and a rapid adoption of novel ICT solutions. Educational institutions and professionals strive to implement effective settings and instructional methods in order to facilitate an acquisition of the 21st century skills. Little attention is paid to changes that take place at the level of interpersonal communication, let alone their possible impacts in the long run. As the methods and the settings diversify, and the whole learning landscape turns hybrid, a good fit between the setting and the instructional method is a daily design …
X-ray flare modeling in the single giant HR 9024
2005
We analyze a Chandra-HETGS observation of the single G-type giant HR 9024. The high flux allows us to examine spectral line and continuum diagnostics at high temporal resolution, to derive plasma parameters (thermal distribution, abundances, temperature, ...). A time-dependent 1D hydrodynamic loop model with semi-length 10$^{12}$cm ($\sim R_{\star}$), and impulsive footpoint heating triggering the flare, satisfactorily reproduces the observed evolution of temperature and emission measure, derived from the analysis of the strong continuum emission. The observed characteristics of the flare appear to be common features in very large flares in active stars (also pre-main sequence stars), possi…
Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, an…
2015
The chemical industry is being forced to evaluate new strategies for more effective utilization of renewable feedstocks to diminish the use of fossil resources. In this literature review, the integration of both acidic and alkaline pretreatment phases of hardwood and softwood chips with chemical pulping is discussed. Depending on the pretreatment conditions, high-volume sulfur-free fractions with varying chemical compositions can be produced. In case of acidic pretreatments, the major products include carbohydrates (mono-, oligo-, and polysaccharides), whereas under alkaline (i.e., aqueous NaOH) pretreatment conditions, the sulfur-free fractions of aliphatic carboxylic acids, lignin, and ex…
Antifungal activity improved by coproduction of cyclodextrins and anabaenolysins in Cyanobacteria
2015
Department of Chemistry, Nanoscience Center, University of Jyväskylä, FI-40014, Jyväskylä, Finland Cyclodextrins are cyclic oligosaccharides widely used in the pharmaceutical industry to improve drug delivery and to increase the solubility of hydrophobic compounds. Anabaenolysins are lipopeptides produced by cyanobacteria with potent lytic activity in cholesterolcontaining membranes. Here, we identified the 23- To 24-kb gene clusters responsible for the production of the lipopeptide anabaenolysin. The hybrid nonribosomal peptide synthetase and polyketide synthase biosynthetic gene cluster is encoded in the genomes of three anabaenolysin-producing strains of Anabaena.We detected previously u…
Algorithmic issues in computational intelligence optimization: from design to implementation, from implementation to design
2016
The vertiginous technological growth of the last decades has generated a variety of powerful and complex systems. By embedding within modern hardware devices sophisticated software, they allow the solution of complicated tasks. As side effect, the availability of these heterogeneous technologies results into new difficult optimization problems to be faced by researchers in the field. In order to overcome the most common algorithmic issues, occurring in such a variety of possible scenarios, this research has gone through cherry-picked case-studies. A first research study moved from implementation to design considerations. Implementation limitations, such as memory constraints and real-time r…
Enseñanza de las ciencias : revista de investigación y experiencias didácticas
2021
Son frecuentes las aproximaciones cualitativas e intuitivas que se hacen en la escuela sobre el movimiento aparente del Sol por el firmamento que tratan de proporcionar al alumnado observaciones para que construya un modelo del sistema Sol-Tierra. El presente trabajo muestra la forma de obtener datos con mayor exactitud de manera que faciliten al alumnado una visión más amplia y profunda de dicho modelo, que lo capacite para enfrentarse y resolver problemas cotidianos y los pueda aplicar a diferentes contextos, como el cuestionamiento de situaciones sociales en las que interviene la luz solar. There are common the intuitive and qualitative approaches made in the School on the apparent movem…
La promozione della capacità di analisi di situazioni educative complesse nei futuri insegnanti di scuola primaria.The promotion of future primary sc…
2011
Il tema della capacità di risoluzione di problemi educativi da parte di coloro che si accingono a svolgere la professione di insegnante, implica l’acquisizione di strategie per reagire in modo adeguato alla complessità dei problemi che connotano le situazioni educative. Si presentano i risultati di una ricerca triennale che ha coinvolto in totale 450 studenti del corso di Laurea in Scienze della Formazione Primaria dell’Università di Palermo. Con la ricerca ci si è posti l’obiettivo di rilevare la capacità degli studenti di affrontare lo studio con un atteggiamento volto alla comprensione e alla soluzione dei problemi concreti con i quali ci si confronta nel lavoro educativo. Si è inteso pr…
Differentiating Malignant from Benign for Melanocytic and Non-melanocytic Skin Tumors : A Pilot Study on Hyperspectral Imaging and Convolutional Neur…
2022
Discriminating Basal Cell Carcinoma and Bowen’s Disease with Novel Hyperspectral Imaging System and Convolutional Neural Networks
2022
Hyperspectral imaging system in the delineation of Ill-defined basal cell carcinomas : a pilot study
2019
Background Basal cell carcinoma (BCC) is the most common skin cancer in the Caucasian population. Eighty per cent of BCCs are located on the head and neck area. Clinically ill‐defined BCCs often represent histologically aggressive subtypes, and they can have subtle subclinical extensions leading to recurrence and the need for re‐excisions. Objectives The aim of this pilot study was to test the feasibility of a hyperspectral imaging system (HIS) in vivo in delineating the preoperatively lateral margins of ill‐defined BCCs on the head and neck area. Methods Ill‐defined BCCs were assessed clinically with a dermatoscope, photographed and imaged with HIS. This was followed by surgical procedures…