4,084 research outputs found
Analysis of X-ray absorption spectra of the K and L 2,3 edges of GaN within the FP-LAPW method
No full textVersión enviada del artículo; finalmente publicado en: Grad, G. y Bonzi, E. (2016). Analysis of x-ray absorption spectra of the K and L 2,3 edges of GaN within the FP-LAPW method. Applied Radiation and Isotopes, 110, 244-250. https://doi.org/10.1016/j.apradiso.2016.02.001Fil: Grad, Gabriela Beatriz. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Bonzi, Edgardo Venusto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Gallium nitride, GaN, is a semiconductor material with several technological applications and therapeutic potential to inhibits the proliferation of tumor cells. In this work we performed all electron self consistent calculations to obtain XANES spectra to be compared with experimental ones in order to study the electronic properties of these systems. The X-ray fine structure of
hexagonal and cubic GaN were studied using the FP-LAPW method with the Tran and Blaha modified Becke-Johnson exchange potential within the DFT formalism. The spectra obtained using the effect of the fractional core hole were compared with experimental cases obtaining very good agreement.info:eu-repo/semantics/submittedVersionFil: Grad, Gabriela Beatriz. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Bonzi, Edgardo Venusto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Física Atómica, Molecular y Química (física de átomos y moléculas incluyendo colisión, interacción con radiación, resonancia magnética, Moessbauer Efecto.
New (Probabilistic) Derivation of Diaz-Metcalf and Pólya-Szegő Inequalities and Consequences
No full textClassical inequalities of Diaz - Metcalf and Pólya - Szegő are generalized to
probabilistic setting which covers the initial deterministic (both discrete and integral) variants.
From these two inequalities, by the probabilistic derivation method further well -
known inequalities are obtained (that ones by Kantorovich, Rennie and Schweitzer)
Discrete equivalence of adjoint neumann–dirichlet div-grad and grad-div equations in curvilinear 3d domains
No full textIn this paper, we will show that the equivalence of a div-grad Neumann problem and a grad-div Dirichlet problem can be preserved at the discrete level in 3-dimensional curvilinear domains if algebraic dual polynomial representations are employed. These representations will be introduced. Proof of the equivalence at the discrete level follows from the construction of the algebraic dual representations. A 3-dimensional test problem in curvilinear coordinates will illustrate this approach.Aerodynamic
A methodology to determine natural radioactivity by γ spectrometry without using calibrated standard samples
No full textArtículo finalmente publicado en: González, E. R., Mainardi, R. T., Grad, G. B. y Bonzi, E. V. (2017). A methodology to determine natural radioactivity by γ spectrometry without using calibrated standard samples. Applied Radiation and
Isotopes, 125, 48-52. http://dx.doi.org/10.1016/j.apradiso.2017.03.025Fil: González, Enrique Ramón. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Mainardi, Raúl Torino. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Grad, Gabriela Beatriz. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Bonzi, Edgardo Venusto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.When determining the radioactivity in materials by γ spectra, different processes are involved difficulting the fit. Besides, calibrated standard samples are necessary. In this work we propose a methodology to determine natural radioactivity using simulated γ spectra by Monte Carlo and without the use of calibrated standard samples. We applied this methodology to determine radioactivity of K 40 isotopes from a light salt sample. Then we applied this process in soil samples and the results where compared with the values obtained by an other laboratory. In this comparison our results are on average a 13 % smaller.info:eu-repo/semantics/acceptedVersionFil: González, Enrique Ramón. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Mainardi, Raúl Torino. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Grad, Gabriela Beatriz. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Fil: Bonzi, Edgardo Venusto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación; Argentina.Física Atómica, Molecular y Química (física de átomos y moléculas incluyendo colisión, interacción con radiación, resonancia magnética, Moessbauer Efecto.
UNI Grad Student News, v13n1, August 2015
No full textInside this issue:
-- Message from the Dean-- Current Faculty Profile: Gabriela Olivares-- Alumni Profile: Cassie Reilly-Boccia-- Current Student Profile: Mike Nguyen-- MBA Capstone Conference-- Graduate Commencement Speakers-- UNI Grad Student News-- Graduate Assistants-- 2015 Recipient of Outstanding Research Paper on Gender Award-- Social Work Awards Event--Graduate College Staff and Contact Informationhttps://scholarworks.uni.edu/gsnews/1021/thumbnail.jp
Measurement of linear accelerator spectra, reconstructed from percentage depth dose curves by neural networks
No full textPurpose Linear accelerator (linac) spectra, used to improve the accuracy of dose calculation and to produce a complete description of beam quality, among other aspects, are relevant in radiotherapy and linear accelerator physics. Methods In this work we apply neural networks in solving an ill-conditioned system of linear equations, to indirectly measure the linear accelerator spectra via the percentage depth dose curves. The photon beam spectra are related to radiation doses through a Fredholm integral equation. To address our problem we measured the percentage depth dose curve in water and solved a discretized Fredholm equation using artificial neural network. After analysing the typology of our physical problem we selected a MultiLayer Perceptron Neural Network and designed the most suitable neural network architecture. Results The reconstructed spectra were compared with spectra from three linacs, two of them obtained by us through simulations and the third produced by another author, achieving a concordance between 92 % and 96 %. Therefore, the spectrum of any accelerator can be quickly and easily reconstructed from measured percent depth dose curves, applying a trained artificial neural network.Fil: Torres Díaz, Jorge. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomia y Física. Grupo de Espectroscopia Atomica y Nuclear; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Pontificia Universidad Católica Madre y Maestra; República DominicanaFil: Grad, Gabriela Beatriz. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; ArgentinaFil: Bonzi, Edgardo. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentin
Experimental determination of L X-ray fluorescence cross sections for elements with 45 < Z < 50 at 10 keV
No full textSynchrotron radiation at 10 keV was used to experimentally determine the Ll, L, LI, LII, LI and LII fluorescence cross sections for elements with 45 < Z < 50, as part of an ongoing investigation at low energies. The measured data were compared with calculated values obtained using coefficients from Scofield, Krause and Puri et al.
Received: 19 December 2013, Accepted: 20 January 2014; Reviewed by: J. P. Marques, Departamento de Física, Centro de Física Atómica, Fac. de Ciências, Universidade de Lisboa, Portugal.; Edited by: P. Weck; DOI: http://dx.doi.org/10.4279/PIP.060001
Cite as: E V Bonzi, G B Grad, R A Barrea, Papers in Physics 6, 060001 (2014
SENSORY INTEGRATION IN CHILDREN WITH DEVELOPMENTAL DISORDERS
No full textSenzorna integracija predstavlja temeljni faktor u svim aspektima razvoja djeteta omogućujući mu uspješnu prilagodbu svijetu u kojem živi. Ključna je za usvajanje viših kognitivnih funkcija kod djece. Različitim osjetnim podražajima poput zvuka, dodira, mirisa prikupljaju informacije koje mozak obrađuje i povezuje u smislenu cjelinu. Ispravna obrada i povezivanje tih podražaja omogućuje djetetu da se uspješno snalazi u svakodnevnim životnim situacijama, komunicira s drugima i usvaja nove vještine. Aktivnosti poput skakanja ili obične vožnje biciklom u ranoj dobi ključne su za razvoj osnovnih kapaciteta za razvijanje kreativnosti, socijalnih vještina, sposobnosti rješavanja problema. Većini ljudi, proces senzorne integracije odvija se automatski i bez posebnog napora. Kod određene djece gdje mozak nije u mogućnosti obraditi osjetne informacije nastaje poremećaj senzorne integracije. Poremećaj uzrokuje poteškoće u ponašanju, učenju i percepciji. Senzorna integracija može se pojaviti kao samostalna teškoća ili kao dio određenog stanja poput autizma, govorno - jezičnih poteškoća, poremećaja pažnje (ADHD). Poremećaj senzorne integracije utječe na socijalno i emocionalno funkcioniranje djeteta. Djeca pokazuju simptom preosjetljivosti na zvukove, teksture, dok mogu biti manje osjetljiva na fizičke podražaje. Problemi mogu postati ozbiljni ometajući njihov razvoj te ih dovesti do niskog samopouzdanja i teškoća u usvajanju socijalnih normi. Senzorna terapija može imati znatan utjecaj na poboljšanje funkcionalnosti djeteta. U senzornoj integraciji koriste se specifične aktivnosti i tehnike za poboljšanje obrade osjetnih informacija, čime se potiče razvoj socijalnih i emocionalnih vještina.Sensory integration plays a crucial role in a child's overall development, enabling them to successfully adapt to the world they live in. It is essential for acquiring higher cognitive functions in children. Through various sensory stimuli such as sound, touch, and smell, they gather information that the brain processes and integrates into a meaningful whole. Proper processing and integration of these stimuli allow a child to navigate everyday situations successfully, communicate with others, and acquire new skills. Activities such as jumping or simply riding a bicycle at an early age are key to developing basic capacities for creativity, social skills, and problem-solving abilities. For most people, the process of sensory integration occurs automatically and effortlessly. However, in some children whose brains cannot process sensory information properly, a sensory integration disorder arises. This disorder leads to difficulties in behavior, learning, and perception itself. Sensory integration issues can appear as an independent difficulty or as part of conditions such as autism, speech and language disorders, or ADHD. Sensory integration disorder affects a child's social and emotional functioning. Children may show symptoms of hypersensitivity to sounds and textures, while being less sensitive to physical stimuli. These problems can become severe, disrupting their development and leading to low self-esteem and difficulties in adopting social norms. Sensory therapy can have a significant impact on improving a child's functionality. It utilizes specific activities and techniques to enhance sensory information processing, fostering better social and emotional skills
Evaluating the performance of the LIME and Grad-CAM explanation methods on a LEGO multi-label image classification task
No full textIn this paper, we run two methods of explanation, namely LIME and Grad-CAM, on a convolutional neural network trained to label images with the LEGO bricks that are visible in them. We evaluate them on two criteria, the improvement of the network's core performance and the trust they are able to generate for users of the system. We nd that in general, Grad-CAM seems to outperform LIME on this specic task: it yields more detailed insight from the point of view of core performance and 80% of respondents asked to choose between them when it comes to the trust they inspire in the model choose Grad-CAM. However, we also posit that it is more useful to employ these two methods together, as the insights they yield are complementary.CSE3000 Research ProjectComputer Science and Engineerin
- …
