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1,639 results on '"Ramirez, Luis"'

1. Explicit realization of bounded modules for symplectic Lie algebras: spinor versus oscillator

Author

Futorny, Vyacheslav, Grantcharov, Dimitar, Ramirez, Luis Enrique, and Zadunaisky, Pablo

Subjects
Mathematics - Representation Theory, 17B10, 16G99
Abstract

We provide an explicit combinatorial realization of all simple and injective (hence, and projective) modules in the category of bounded $\mathfrak{sp}(2n)$-modules. This realization is defined via a natural tableaux correspondence between spinor-type modules of $\mathfrak{so}(2n)$ and oscillator-type modules of $\mathfrak{sp}(2n)$. In particular, we show that, in contrast with the $A$-type case, the generic and bounded $\mathfrak{sp}(2n)$-modules admit an analog of the Gelfand-Graev continuation from finite-dimensional representations., Comment: 24 pages

Published
2024

2. Modeling Microstrip Antenna

Author

Ramirez, Luis Alberto Rabanal and Silva, Cláudio Márcio de Freitas

Subjects
Mathematics - Numerical Analysis
Abstract

In this work, a rectangular microstrip antenna with inset is designed, simulated and optimized. In the optimization process the patch is deformed, it new antenna present a amorphous patch. The optimization process was conducted with Genetic Algorithm (GA), S11 parameters was obtained with full wave Finite-Differences Time-Domain (FDTD-3D), and the initial configuration (design) was obtained with line transmission and cavite method., Comment: 3 pages, six figures

Published
2024

6. Sympletic tracking methods for insertion devices: a Robinson wiggler example

Author

Li, Ji, Feikes, Jörg, Mertens, Tom, Rial, Edward, Ries, Markus, Schälicke, Andreas, and Ramirez, Luis Vera

Subjects
Physics - Accelerator Physics
Abstract

Modern synchrotron light sources are often characterized with high-brightness synchrotron radiation from insertion devices. Inevitably, insertion devices introduce nonlinear distortion to the beam motion. Symplectic tracking is crucial to study the impact, especially for the low- and medium-energy storage rings. This paper uses a Robinson wiggler as an example to illustrate an universally applicable analytical representation of the magnetic field and to summarizes four different symplectic tracking methods.

Published
2022

9. Unsupervised real-world knowledge extraction via disentangled variational autoencoders for photon diagnostics

Author

Hartmann, Gregor, Goetzke, Gesa, Düsterer, Stefan, Feuer-Forson, Peter, Lever, Fabiano, Meier, David, Möller, Felix, Ramírez, Luis Vera, Guehr, Markus, Tiedtke, Kai, Viefhaus, Jens, and Braune, Markus

Subjects
Physics - Data Analysis, Statistics and Probability, Physics - Accelerator Physics, Physics - Atomic Physics
Abstract

We present real-world data processing on measured electron time-of-flight data via neural networks. Specifically, the use of disentangled variational autoencoders on data from a diagnostic instrument for online wavelength monitoring at the free electron laser FLASH in Hamburg. Without a-priori knowledge the network is able to find representations of single-shot FEL spectra, which have a low signal-to-noise ratio. This reveals, in a directly human-interpretable way, crucial information about the photon properties. The central photon energy and the intensity as well as very detector-specific features are identified. The network is also capable of data cleaning, i.e. denoising, as well as the removal of artefacts. In the reconstruction, this allows for identification of signatures with very low intensity which are hardly recognisable in the raw data. In this particular case, the network enhances the quality of the diagnostic analysis at FLASH. However, this unsupervised method also has the potential to improve the analysis of other similar types of spectroscopy data.

Published
2022

10. Optimizing a Superconducting Radiofrequency Gun Using Deep Reinforcement Learning

Author

Meier, David, Ramirez, Luis Vera, Völker, Jens, Sick, Bernhard, Viefhaus, Jens, and Hartmann, Gregor

Subjects
Physics - Accelerator Physics, Physics - Data Analysis, Statistics and Probability
Abstract

Superconducting photoelectron injectors are a promising technique for generating high brilliant pulsed electron beams with high repetition rates and low emittances. Experiments such as ultra-fast electron diffraction, experiments at the Terahertz scale, and energy recovery linac applications require such properties. However, optimization of the beam properties is challenging due to the high amount of possible machine parameter combinations. In this article, we show the successful automated optimization of beam properties utilizing an already existing simulation model. To reduce the amount of required computation time, we replace the costly simulation by a faster approximation with a neural network. For optimization, we propose a reinforcement learning approach leveraging the simple computation of the derivative of the approximation. We prove that our approach outperforms common optimization methods for the required function evaluations given a defined minimum accuracy.

Published
2022
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16. A dominant function of LynB kinase in preventing autoimmunity

Author

Brian, Ben F, Sauer, Monica L, Greene, Joseph T, Senevirathne, S Erandika, Lindstedt, Anders J, Funk, Olivia L, Ruis, Brian L, Ramirez, Luis A, Auger, Jennifer L, Swanson, Whitney L, Nunez, Myra G, Moriarity, Branden S, Lowell, Clifford A, Binstadt, Bryce A, and Freedman, Tanya S

Subjects
Autoimmune Disease, Genetics, Lupus, 2.1 Biological and endogenous factors, Aetiology, Inflammatory and immune system
Abstract

Here, we report that the LynB splice variant of the Src-family kinase Lyn exerts a dominant immunosuppressive function in vivo, whereas the LynA isoform is uniquely required to restrain autoimmunity in female mice. We used CRISPR-Cas9 gene editing to constrain lyn splicing and expression, generating single-isoform LynA knockout (LynAKO) or LynBKO mice. Autoimmune disease in total LynKO mice is characterized by production of antinuclear antibodies, glomerulonephritis, impaired B cell development, and overabundance of activated B cells and proinflammatory myeloid cells. Expression of LynA or LynB alone uncoupled the developmental phenotype from the autoimmune disease: B cell transitional populations were restored, but myeloid cells and differentiated B cells were dysregulated. These changes were isoform-specific, sexually dimorphic, and distinct from the complete LynKO. Despite the apparent differences in disease etiology and penetrance, loss of either LynA or LynB had the potential to induce severe autoimmune disease with parallels to human systemic lupus erythematosus (SLE).

Published
2022

17. Faces of polyhedra associated with relation modules

Author

Benitez, Germán and Ramírez, Luis Enrique

Subjects
Mathematics - Representation Theory, Mathematics - Combinatorics, 17B10 (Primary), 52B05 (Secondary)
Abstract

Relation Gelfand-Tsetlin $\mathfrak{gl}_n$-modules were introduced in [FRZ19], and are determined by some special directed graphs and Gelfand-Tsetlin characters. In this work we constructed polyhedra associated with the class of relation modules, which includes as a particular case, any classical Gelfand-Tsetlin polytope. Following the ideas presented in [LM04] we give a characterization of $d$-faces of the associated polyhedra in terms of a matrix related to the corresponding graph., Comment: 1 figure

Published
2021

22. Ethnobotanical Science in the Clouds: Useful Plants of Northeastern Oaxaca, Mexico

Author

Rendón-Aguilar, Beatriz, Bravo-Avilez, David, Bernal-Ramírez, Luis Alberto, García-Mendoza, Abisaí, Espejo-Serna, Adolfo, López-Ferrari, Ana Rosa, Durán-Espinosa, Carlos, Gernandt, David S., Lorea-Hernández, Francisco, Ibarra-Manríquez, Guillermo, Jiménez-Ramírez, Jaime, de Santiago-Gómez, Jesús Ricardo, Santana-Carrillo, Jorge, Villaseñor, José Luis, Yáñez-Espinosa, Laura, Lozada-Pérez, Lucio, Samain, Marie-Stéphanie, Valencia-Ávalos, Susana, Fonseca-Juárez, Rosa María, Arias-Montes, Salvador, Bussmann, Rainer W., Series Editor, Paniagua-Zambrana, Narel Y., Series Editor, Casas, Alejandro, editor, and Blancas Vázquez, José Juan, editor

Published
2023
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23. Comparative Analysis of Signal Strength in 5 LTE Networks Cell in Riobamba-Ecuador with 5 Propagation Models

Author

Chiguano, Kevin, Coro, Andrea Liseth, Ramirez, Luis, Tite, Bryan, Abrigo, Edison, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Reddy, K. Ashoka, editor, Devi, B. Rama, editor, George, Boby, editor, Raju, K. Srujan, editor, and Sellathurai, Mathini, editor

Published
2023
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28. Simple modules for Affine vertex algebras in the minimal nilpotent orbit

Author

Futorny, Vyacheslav, Morales, Oscar Armando Hernandez, and Ramirez, Luis Enrique

Subjects
Mathematics - Representation Theory
Abstract

We explicitly construct, in terms of Gelfand--Tsetlin tableaux, a new family of simple positive energy representations for the simple affine vertex algebra V_k(sl_{n+1}) in the minimal nilpotent orbit of sl_{n+1}. These representations are quotients of induced modules over the affine Kac-Moody algebra of sl_n+1 and include in particular all admissible simple highest weight modules and all simple modules induced from sl_2. Any such simple module in the minimal nilpotent orbit has bounded weight multiplicities., Comment: 29 pages, to appear in IMRN

Published
2020
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29. Transitional Care for Patients with Congenital Colorectal Diseases: An EUPSA Network Office, ERNICA, and eUROGEN Joint Venture

Author

Abbo, Olivier, Angotti, Rossella, Antunovic, Sanja Sindjic, Anzelewicz, Stefan, Arneitz, Christoph, Arnold, Marion, Assi, Zaki, Aydin, Emrah, Ballouhey, Quentin, Barila, Patricia, Basson, Sonia, Besendorfer, Manuel, Di Cesare, Antonio, Dariel, Anne, Dekeryte, Inga, Djordjevic, Ivona, Domenichelli, Vincenzo, Duranteau, Lise, Durakbasa, Cigdem, Ebert, Anne-Karoline, Ellerkamp, Verena, Leon, Francesco Fascetti, Fisch, Margit, Vazquez, Araceli García, Gielok, Christoph, Bahadir, Gulnur Gollu, Haecker, Frank-Martin, Holmdahl, Gundela, Irtan, Sabine, Jones, Ceri, Kakar, Mohit, Keshtgar, Ali, Kvist, Kolja, Laconi, Francesco, Laurance, Marie, Candel, Eduardo Lopez, Ludwiczek, Johanna, Ludwikowski, Barbara, Macchini, Francesco, Malota, Mark, Matthyssens, Lucas, Martin, Benjamin, Martinez, Leopoldo, Midrio, Paola, Miserez, Marc, Mosiello, Giovanni, Pascual, Francisco Murcia, Nunez, Bernardo, Olén, Roger, Öztorun, Can İhsan, Parlak, Ayse, Prato, Alessio Pini, Poupalou, Anna, Arias, Marcos Prada, Prat, Jordi, Gil, Carlos Pueyo, Avila Ramirez, Luis Felipe, Reingruber, Bertram, Riccipetitoni, Giovanna, Riechardt, Silke, Risteski, Toni, Rogula, Wojciech, Rolle, Udo, Romeo, Carmelo, Schäfer, Frank-Mattias, Scirè, Gabriella, Sfeir, Rony, Singer, Georg, Sloots, Pim, Stanton, Michael, Stenström, Pernilla, Stockinger, Maria, Surhan, M., Suominen, Janne, Syed, Julia, Talon, Isabelle, Tanriverdi, Halil Ibrahim, Uzunlu, Osman, Valfre, Laura, Witvliet, Marieke, Zambaiti, Elisa, Zanatta, Cinzia, Zani, Augusto, de Beaufort, Cunera M.C., Aminoff, Dalia, de Blaauw, Ivo, Crétolle, Célia, Dingemann, Jens, Durkin, Natalie, Feitz, Wout F.J., Fruithof, JoAnne, Grano, Caterina, Burgos, Carmen Mesas, Schwarzer, Nicole, Slater, Graham, Soyer, Tutku, Violani, Cristiano, Wijnen, Rene, de Coppi, Paolo, and Gorter, Ramon R.

Published
2023
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31. Long-term prognostic value of quantitative-flow-ratio-concordant revascularization in stable coronary artery disease

Author

Cortés, Carlos, Fernández-Corredoira, Pablo M., Liu, Lili, López-Palop, Ramón, Rivero, Fernando, Jiménez, Octavio, Freites, Alfonso, Goncalves-Ramirez, Luis R., Minguito, Carlos, Concepción, Ricardo, Pérez, Ainhoa, del Val, David, Leithod, Gunnar, Oberhuber-Kurth, Jonas, Amat-Santos, Ignacio J., Diarte, José A., San Román, J. Alberto, Ortas Nadal, Maria Rosario, and Gutiérrez-Chico, Juan Luis

Published
2023
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42. Azure

Author

Ramirez, Luis

Abstract

This music score was submitted for the Kaleidoscope 2020 Call for Scores, an open access collaboration with the UCLA Music Library.

Published
2020

43. Chido

Author

Ramirez, Luis

Abstract

This music score was submitted for the Kaleidoscope 2020 Call for Scores, an open access collaboration with the UCLA Music Library.

Published
2020

44. Classification of irreducible Gelfand-Tsetlin modules of sl(3)

Author

Futorny, Vyacheslav, Grantcharov, Dimitar, and Ramirez, Luis Enrique

Subjects
Mathematics - Representation Theory
Abstract

We provide a classification and an explicit realization of all irreducible Gelfand-Tsetlin modules of the complex Lie algebra sl(3). The realization of these modules uses regular and derivative Gelfand-Tsetlin tableaux. In particular, we list all simple Gelfand-Tsetlin sl(3)-modules with infinite-dimensional weight spaces. Also, we express all simple Gelfand-Tsetlin sl(3)-modules as subquotionets of localized Gelfand-Tsetlin E_{21}-injective modules., Comment: Preliminary version. 97 pages, 46 pictures

Published
2018

45. Bounds of Gelfand-Tsetlin multiplicities and tableaux realizations of Verma modules

Author

Futorny, Vyacheslav, Grantcharov, Dimitar, Ramirez, Luis Enrique, and Zadunaisky, Pablo

Subjects
Mathematics - Representation Theory, 16G99, 17B10
Abstract

We introduce the notion of essential support of a simple Gelfand-Tsetlin $\mathfrak{gl}_n$-module as an important tool towards understanding the character formula of such module. This support detects the weights in the module having maximal possible Gelfand-Tsetlin multiplicities. Using combinatorial tools we describe the essential supports of the simple socles of the universal tableaux modules. We also prove that every simple Verma module appears as a socle of a universal tableaux module and hence obtain a description of the essential supports of all simple Verma modules. As a consequence, we prove the Strong Futorny-Ovsienko Conjecture on the sharpness of the upper bounds of the Gelfand-Tsetlin multiplicities. In addition we give a very explicit description of the support and essential support of the simple singular Verma module $M(-\rho)$, Comment: 25 pages, some changes made to Introduction in the new version

Published
2018

46. Neuromarketing to Discover Customer Satisfaction

Author

Ramirez, Luis Alberto Partida, Marquez, Bogart Yail, Magdaleno-Palencia, Jose Sergio, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Guarda, Teresa, editor, Portela, Filipe, editor, and Augusto, Maria Fernanda, editor

Published
2022
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