493 results on '"Juan Soto"'
Search Results
2. Comparative performance of theoretical tools in order to quantify the effect of the electric potential on the vibrational wavenumbers and intensities of the SERS of 2‐methylpyrazine adsorbed on a nanostructured silver electrode
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Samuel Valdivia, Daniel Aranda, Juan Soto, Juan Carlos Otero, and Isabel López‐Tocón
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General Materials Science ,Spectroscopy - Published
- 2022
3. Photochemistry of 1-Phenyl-1-diazopropane and Its Diazirine Isomer: A CASSCF and MS-CASPT2 Study
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JUAN SOTO
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Physical and Theoretical Chemistry - Abstract
In this work, we studied the wavelength (520 or 350 nm) dependence of the photochemical decomposition of 1-phenyl-1-diazopropane (
- Published
- 2022
4. S, N-doped carbon dots-based cisplatin delivery system in adenocarcinoma cells: Spectroscopical and computational approach
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Tanja Dučić, Carla S. Alves, Željko Vučinić, Juan M. Lázaro-Martínez, Marijana Petković, Juan Soto, Dragosav Mutavdžić, M. Valle Martínez de Yuso, Ksenija Radotić, and Manuel Algarra
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Ovarian Neoplasms ,Adenocarcinoma ,Carbon ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Biomaterials ,Colloid and Surface Chemistry ,Ovarian cancer ,Cell Line, Tumor ,Drug delivery ,Carbon dots ,Humans ,Female ,Cisplatin ,Cisplatin resistance ,Spectroscopy - Abstract
S and N-doped carbon dots (S-CDs and N-CDs) and their cisplatin (cis-Pt) derivatives. (S-CDs@cis-Pt and N-CDs@cis-Pt) were tested on two ovarian cancer cell lines: A2780 and A2780 cells resistant to cis-Pt (A2780R). Several spectroscopic techniques were employed to check S-CDs@cis-Pt and N-CDs@cis-Pt: solid- and solution-state nuclear magnetic resonance, matrix-assisted laser desorption, ionization time-of-flight mass spectrometry, and X-ray photoelectron spectroscopy. In addition, synchrotron-based Fourier Transformed Infrared spectro-microscopy was used to evaluate the biochemical changes in cells after treatment with cis-Pt, S-CDs, N-CDs, or S-CDs@cis-Pt and N-CDs@cis-Pt, respectively. Computational chemistry was applied to establish the model for the most stable bond between S-CDs and N-CDs and cis-Pt. The results revealed the successful modification of S-CDs and N-CDs with cis-Pt and the formation of a stable composite system that can be used for drug delivery to cancer cells and likewise to overcome acquired cis-Pt resistance. Nanoparticle treatment of A2780 and A2780R cells led to the changes in their structure of lipids, proteins, and nucleic acids depending on the treatment. The results showed the S-CDs@cis-Pt and N-CDs@cis-Pt might be used in the combination with cis-Pt to treat the adenocarcinoma, thus having a potential to be further developed as drug delivery systems.
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- 2022
5. CASPT2 study of the electronic structure and photochemistry of protonated N-nitrosodimethylamine (NDMA-H+) at 453 nm
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Juan Soto, Daniel Peláez, and Manuel Algarra
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General Physics and Astronomy ,Physical and Theoretical Chemistry - Abstract
In this work, we have studied the photodissociation of the protonated derivatives of N-nitrosodimethylamine [(CH3)2N–NO] with the CASPT2 method. It is found that only one of the four possible protonated species of the dialkylnitrosamine compound absorbs in the visible region at 453 nm, that is, N-nitrosoammonium ion [(CH3)2NH-NO]+. This species is also the only one whose first singlet excited state is dissociative to directly yield the aminium radical cation [(CH3)2NHN·]+ and nitric oxide. In addition, we have studied the intramolecular proton migration reaction {[(CH3)2N–NOH]+ → [(CH3)2NH–NO]+} both in the ground and excited state (ESIPT/GSIPT); our results indicate that this process is not accessible neither in the ground nor in the first excited state. Furthermore, as a first approximation, MP2/HF calculations on the nitrosamine–acid complex indicate that in acidic solutions of aprotic solvents, only [(CH3)2NH–NO]+ is formed.
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- 2023
6. The Influence of Surface Iron Contamination on the Localized Corrosion Resistance of Austenitic and Duplex Stainless Steel, Studied with a Novel Rust Deposition Method
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Edgar C. Hornus, Juan Soto Gutierrez, Francisco Vouilloz, Mobin Salasi, and Mariano Iannuzzi
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General Chemical Engineering ,fungi ,technology, industry, and agriculture ,food and beverages ,General Materials Science ,General Chemistry - Abstract
The influence of iron contamination on a stainless steel surface was evaluated based on a novel rust deposition procedure. The main variables that control the corrosion process and the influence of iron contamination on localized corrosion resistance of austenitic and super duplex stainless steel were investigated. Cyclic potentiodynamic polarization tests and environmental exposure with different rust surface contamination degrees were performed. Potentiodynamic polarization curves showed that iron contamination deteriorated the local corrosion resistance of both stainless steels. Environmental salt-spray exposure results indicated that the alloy resistance to rust contamination increased with the materials’ pitting resistance equivalent. Likewise, the extent of localized corrosion decreased with the rust contamination degree. These findings suggested that preferential corrosion from rust contamination was associated with the occluded solution chemistry. Environmentally friendly cleaning methods, including chemical treatments and laser cleaning, were evaluated as alternatives to hazardous pickling based on hydrofluoric-nitric acid. Last, practical recommendations for rust contamination of stainless steel are addressed.
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- 2022
7. Atrous cGAN for SAR to Optical Image Translation
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Jose David Bermudez Castro, Pedro Juan Soto Vega, Daliana Lobo Torres, Raul Queiroz Feitosa, P. N. Happ, and Javier Noa Turnes
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Synthetic aperture radar ,Spatial contextual awareness ,Discriminator ,Computer science ,business.industry ,Pattern recognition ,Geotechnical Engineering and Engineering Geology ,Translation (geometry) ,Image translation ,Segmentation ,Pyramid (image processing) ,Artificial intelligence ,Electrical and Electronic Engineering ,business ,Feature learning - Abstract
Conditional (cGAN)-based methods proposed so far for synthetic aperture radar (SAR)-to-optical image synthesis tend to produce noisy and unsharp optical outcomes. In this work, we propose the atrous-cGAN, a novel cGAN architecture that improves the SAR-to-optical image translation. The proposed generator and discriminator networks rely on atrous convolutions and incorporate an atrous spatial pyramid pooling (ASPP) module to enhance fine details in the generated optical image by exploiting spatial context at multiple scales. This letter reports experiments carried out to assess the performance of atrous-cGAN for the synthesis of Landsat-8 images from Sentinel-1A data based on three public data sets. The experimental analysis indicated that the atrous-cGAN consistently outperformed the classical pix2pix counterpart in terms of visual quality, similar to the true optical image, and as a feature learning tool for semantic segmentation.
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- 2022
8. Extensional Deformation of a Shale-dominated Delta: Tarakan Basin, Offshore Indonesia
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Aurio Erdi, Christopher Jackson, and Juan Soto
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Deformation on shale-rich continental margins is commonly associated with thin-skinned extension above mobile shales. Normal faulting and shale mobilization are widespread on such margins, being associated with and controlled by progradation and gravitational failure of deltaic sedimentary wedges. However, due to limitations in our ability to seismically imaging these mobile shales, our understanding of how base-shale relief controls deformation, and the shape, size, and distribution of shale structures remain poorly understood. We here use 3D seismic reflection data from the Tarakan Basin, offshore Indonesia to investigate the temporal and spatial evolution of thin-skinned deformations of the Neogene sedimentary section. Our detailed seismic interpretation reveals long (≤ 74 km), concave- and convex-into-the-basin faults, dipping both basinward (eastwards) and locally landward (westwards), which detach downwards on a basal mobile shale (Middle Miocene). The base of the shale unit dips gently (< 17o) seaward, although older (Paleogene), rift-related normal faults mean a local base-shale relief is present. Our analysis of isochron (thickness map) analysis shows that supra-shale normal faulting commenced in the Middle Miocene and was accompanied by the formation of hanging wall rollover folds and associated crestal grabens, with the subsequent along- and across strike migration of strain being related to the nucleation, lateral linkage, and reactivation of individual fault systems. Updip growth faulting was also accompanied by the downslope flow of mobile shale, margin-parallel and-perpendicular differential loading, and local contraction and mobile shale-upbuilding, resulting in the growth of large, margin-parallel shale anticlines further downdip. These faults and anticlines are locally overlain by tall (≤ 5 km) mud diapirs and volcanoes. We suggest that variations in the rate of sediment loading, mobile shale flow, fault growth, and gravitational failure above a seaward-dipping, but slightly rugose base-shale surface, controlled Neogene deformations in the Tarakan Basin. We also demonstrate how variations in the trend and dip of the base-shale surface influences the position, timing, and evolution of supra-shale faults and their associated depocenters along shale-rich, delta-fed clastic margins.
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- 2023
9. Booming Sector, Multinationals, and Local Economic Development
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Juan Soto
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History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2023
10. An unsupervised domain adaptation approach for change detection and its application to deforestation mapping in tropical biomes
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Raul Queiroz Feitosa, Mabel Ximena Ortega Adarme, Gilson Alexandre Ostwald Pedro da Costa, Franz Rottensteiner, Cláudio Aparecido de Almeida, Pedro Juan Soto Vega, and Christian Heipke
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Structure (mathematical logic) ,business.industry ,Computer science ,Deep learning ,Pattern recognition ,Class (biology) ,Atomic and Molecular Physics, and Optics ,Computer Science Applications ,Domain (software engineering) ,Classifier (linguistics) ,Artificial intelligence ,Deforestation (computer science) ,Computers in Earth Sciences ,Adaptation (computer science) ,business ,Engineering (miscellaneous) ,Change detection - Abstract
Changes in environmental conditions, geographical variability and different sensor properties typically make it almost impossible to employ previously trained classifiers for new data without a significant drop in classification accuracy. Domain adaptation (DA) techniques been proven useful to alleviate that problem. In particular, appearance adaptation techniques may be used to adapt images from a specific dataset in such a way that the generated images have a style that is similar to the images from another dataset. Such techniques are, however, prone to creating artifacts that hinder proper classification of the adapted images. In this work we propose an unsupervised DA approach for change detection tasks, which is based on a particular appearance adaptation method: the Cycle-Consistent Generative Adversarial Network (CycleGAN). Specifically, we extend that method by introducing additional constraints in the training phase of the model components, which make it preserve the semantic structure and class transitions in the adapted images. We evaluate the proposed approach on a deforestation detection application, considering different sites in the Amazon rain-forest and in the Brazilian Cerrado (savanna) using Landsat-8 images. In the experiments, each site corresponds to a domain, and the accuracy of a classifier trained with images and references from one (source) domain is measured in the classification of another (target) domain. The results show that the proposed approach is successful in producing artifact-free adapted images, which can be satisfactory classified by the pre-trained source classifiers. On average, the accuracies achieved in the classification of the adapted images outperformed the baselines (when no adaptation was made) by 7.1% in terms of mean average precision, and 9.1% in terms of F1-Score. To the best of our knowledge, the proposed method is the first unsupervised domain adaptation approach devised for change detection.
- Published
- 2021
11. Electronic Structure of Nitrobenzene: A Benchmark Example of the Accuracy of the Multi-State CASPT2 Theory
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Manuel Algarra and Juan Soto
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Work (thermodynamics) ,Disociación ,Field (physics) ,Chemistry ,Electron ,Electronic structure ,CASSCF ,Article ,Atomic orbital ,Reacción de Disociación ,Complete active space ,Physical and Theoretical Chemistry ,Atomic physics ,Ground state ,Estructura electrónica ,Nitrobenceno ,Excitation - Abstract
The electronic structure of nitrobenzene (C6H5NO2) has been studied by means of the complete active space self-consistent field (CASSCF) and multi-state second-order perturbation (MS-CASPT2) methods. To this end, an active space of 20 electrons distributed in 17 orbitals has been selected to construct the reference wave function. In this work, we have calculated the vertical excitation energies and the energy barrier for the dissociation of the molecule on the ground state into phenyl and nitrogen dioxide. After applying the corresponding vibrational corrections to the electronic energies, it is demonstrated that the MS-CASPT2//CASSCF values obtained in this work yield an excellent agreement between calculated and experimental data. In addition, other active spaces of lower size have been applied to the system in order to check the active space dependence in the results. UNIVERSIDAD DE MALAGA
- Published
- 2021
12. Computational Model for Electrochemical Surface-Enhanced Raman Scattering: Key Role of the Surface Charges and Synergy between Electromagnetic and Charge-Transfer Enhancement Mechanisms
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Daniel Aranda, Francisco García-González, Francisco José Avila Ferrer, Isabel López-Tocón, Juan Soto, and Juan Carlos Otero
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Physical and Theoretical Chemistry ,Computer Science Applications - Abstract
We present a computational model for electrochemical surface-enhanced Raman scattering (EC-SERS). The surface excess of charge induced by the electrode potential (
- Published
- 2022
13. FLAIRR-seq: A novel method for single molecule resolution of near full-length immunoglobulin heavy chain repertoires
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Easton E. Ford, David Tieri, Oscar Rodriguez, Nancy Francoeur, Juan Soto, Justin Kos, Ayelet Peres, William Gibson, Catherine A. Silver, Gintaras Deikus, Elizabeth Hudson, Cassandra R. Woolley, Noam Beckmann, Alexander Charney, Thomas C. Mitchell, Gur Yaari, Robert P. Sebra, Corey T. Watson, and Melissa L. Smith
- Abstract
Current Adaptive Immune Receptor Repertoire Sequencing (AIRR-seq) strategies resolve expressed antibody (Ab) transcripts with limited resolution of the constant region. Here we present a novel near full-length AIRR-seq (FLAIRR-Seq) method that utilizes targeted amplification by 5’ rapid amplification of cDNA ends (RACE), combined with single molecule, real-time sequencing to generate highly accurate (>Q40, 99.99%) IG heavy chain transcripts. FLAIRR-seq was benchmarked by comparing IG heavy chain variable (IGHV), diversity (IGHD), and joining (IGHJ) gene usage, complementarity-determining region 3 (CDR3) length, and somatic hypermutation to matched datasets generated with standard 5’ RACE AIRR-seq and full-length isoform sequencing. Together these data demonstrate robust, unbiased FLAIRR-seq performance using RNA samples derived from peripheral blood mononuclear cells, purified B cells, and whole blood, which recapitulated results generated by commonly used methods, while additionally resolving novel IG heavy chain constant (IGHC) gene features. FLAIRR-seq data provides, for the first time, simultaneous, single-molecule characterization of IGHV, IGHD, IGHJ, and IGHC region genes and alleles, allele-resolved subisotype definition, and high-resolution identification of class-switch recombination within a clonal lineage. In conjunction with genomic sequencing and genotyping of IGHC genes, FLAIRR-seq of the IgM and IgG repertoires from 10 individuals resulted in the identification of 32 unique IGHC alleles, 28 (87%) of which were previously uncharacterized. Together, these data demonstrate the capabilities of FLAIRR-seq to characterize IGHV, IGHD, IGHJ, and IGHC gene diversity for the most comprehensive view of bulk expressed Ab repertoires to date.
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- 2022
14. HyMAC
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Aoying Zhou, Juan Soto, Weining Qian, Zhizhen Xu, Chen Xu, Zihao Chen, and Volker Markl
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Numerical linear algebra ,Computer science ,General Engineering ,computer.software_genre ,computer ,Computational science - Abstract
Distributed matrix computation is common in large-scale data processing and machine learning applications. Iterative-convergent algorithms involving matrix computation share a common property: parameters converge non-uniformly. This property can be exploited to avoid redundant computation via incremental evaluation . Unfortunately, existing systems that support distributed matrix computation, like SystemML, do not employ incremental evaluation. Moreover, incremental evaluation does not always outperform classical matrix computation, which we refer to as a full evaluation . To leverage the benefit of increments, we propose a new system called HyMAC , which performs hybrid plans to balance the trade-off between full and incremental evaluation at each iteration. In this demonstration, attendees will have an opportunity to experience the effect that full, incremental, and hybrid plans have on iterative algorithms.
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- 2021
15. [99mTc]Tc-iPSMA SPECT brain imaging as a potential specific diagnosis of metastatic brain tumors and high-grade gliomas
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Claudia G. Bautista-Wong, Bayron A. Sandoval-Bonilla, Jorge Iván González-Díaz, Rosa María Villanueva-Pérez, Bárbara Nettel-Rueda, Guillermina Ferro-Flores, Keren Contreras-Contreras, Clara Santos-Cuevas, Paola Vallejo-Armenta, and Juan Soto-Andonaegui
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Cancer Research ,Pathology ,medicine.medical_specialty ,Reactive gliosis ,business.industry ,Brain tumor ,SPECT Brain ,medicine.disease ,030218 nuclear medicine & medical imaging ,Vascular endothelium ,03 medical and health sciences ,0302 clinical medicine ,Gliosis ,Neuroimaging ,030220 oncology & carcinogenesis ,Glioma ,medicine ,Molecular Medicine ,Immunohistochemistry ,Radiology, Nuclear Medicine and imaging ,medicine.symptom ,business - Abstract
Background PSMA (prostate-specific membrane antigen) protein is heavily expressed in the proliferating microvasculature of high-grade gliomas (HGG) and brain metastases (BM). This research aimed to assess [99mTc]Tc-iPSMA SPECT brain imaging as a potential specific diagnosis of HGG and BM by PSMA-targeting in their proliferating vasculature. Methods Forty-one patients, with suspected brain tumors, as detected by enhanced MRI scanning, were enrolled to undergo preoperative [99mTc]Tc-iPSMA SPECT brain imaging. Semiquantitative image analyses, to evaluate the maximum target-to-background ratio (TBRmax), were performed. All diagnoses were histopathologically confirmed. PSMA expression was evaluated by immunohistochemistry (IHC) in 11 brain tumor tissues. TBRmax values were correlated with IHC results and tumor WHO grade (HGG vs LGG). Results [99mTc]Tc-iPSMA images showed increased uptake in BM, HGG, and recurrent gliomas (TBRmax of 25.1 ± 7.1, 18.5 ± 9.0, 15.0 ± 9.9, respectively), and was negative in treatment-naive patients with LGG and reactive gliosis. PSMA was highly expressed in the vascular endothelium of grade IV gliomas and BM, while its expression was extremely low in LGG and completely absent in gliosis. By using 2.8 as a threshold value for TBRmax, the specificity, sensitivity, PPV, NPV and accuracy were 100%, 94%, 100%, 77% and 95%, respectively. Conclusions The results of this pilot study show that [99mTc]Tc-iPSMA SPECT brain imaging is a specific and potentially useful neuroimaging tool for assessing tumoral neovasculature formation in gliomas and brain metastases.
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- 2021
16. Principles of Shortening in Salt Basins Containing Isolated Minibasins
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Christopher A.-L. Jackson, Michael R. Hudec, Juan Soto, Tim P. Dooley, Naiara Fernandez, and Oliver B. Duffy
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chemistry.chemical_classification ,chemistry ,Flow (psychology) ,Salt (chemistry) ,Thrust ,Fold (geology) ,Petrology ,Rotation ,Structural evolution ,Geology - Abstract
Shortening styles in salt-influenced basins can vary markedly, with the volume and distribution of salt prior to shortening being a key control. Here we use a suite of physical models to examine styles of thin-skinned regional shortening in settings where the pre-shortening structure comprised minibasins surrounded by salt (‘isolated-minibasin’ provinces). Our models show that the high volume of mechanically-weak salt localizes lateral regional shortening, with shortening inducing salt flow towards the foreland that subsequently contributes to three key processes - translation, tilting and rotation of minibasins. First, we demonstrate that the flowing salt pushes against minibasins, propelling them in the regional shortening direction. Minibasin translation is enhanced by fast-flowing salt streams and impeded by basal friction due to welding and base-salt buttresses. Second, we show how minibasin tilt directions and magnitudes vary spatially and temporally during regional shortening. Minibasins tilt away from zones of pressurized salt, the locations of which may shift due to changes in salt flow regimes. Tilt directions may also change as minibasins pivot on primary welds, or due to forces associated with minibasin collision. Third, minibasins can rotate around sub-vertical axes during regional shortening. We speculate that this rotation is caused by a combination of: i) traction imparted on the minibasin boundary by differential horizontal flow of adjacent salt; and ii) pivoting on primary and secondary welds. We synthesize our results in a series of 3-D conceptual models, before we compare and contrast regional shortening styles and processes in salt-influenced basins with different pre-shortening salt configurations. Our findings contribute to the understanding of the geometry and kinematics of shortened salt basins, as well as a deeper understanding of the tectono-stratigraphic evolution of minibasins.
- Published
- 2022
17. Phenylamine/Amide Grafted in Silica as Sensing Nanocomposites for the Removal of Carbamazepine: A DFT Approach
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Manuel Algarra, Shehdeh Jodeh, Israa Aqel, Ghadir Hanbali, Smaail Radi, Said Tighadouini, Raed Alkowni, Juan Soto, Subhi Samhan, Savaş Kaya, and Konstantin Katin
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carbamazepine ,amine-modified silica ,adsorption ,phenylamine ,regeneration ,Physical and Theoretical Chemistry ,Analytical Chemistry - Abstract
This study aimed to remove carbamazepine from aqueous solutions, using functional silica phenylamine (SiBN), which is characterized and showed excellent chemical and thermal stability. Adsorbents based on silica were developed due to their unusually large surface area, homogenous pore structure, and well-modified surface properties, as silica sparked tremendous interest. It was determined to develop a novel silica adsorbent including phenylamine and amide (SiBCON). The adsorbents obtained were analyzed by various spectroscopy devices, including SEM, FT-IR and TGA analysis. The maximum removal rates for carbamazepine were 98.37% and 98.22% for SiBN and SiBCON, respectively, when optimized at room temperature, pH 9.0, initial concentration of 10 mg·L−1 and contact time of 15 min. Theoretical tools are widely used in the prediction of the power of interactions between chemical systems. The computed data showed that new amine modified silica is quite effective in terms of the removal of carbamazepine from aqueous solution. Calculation binding energies and DFT data showed that there is a powerful interaction between amine-modified silica and carbamazepine.
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- 2022
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18. Generation of POJOs and DAOs Classes from Metadata Database
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Rene Santaolaya, Juan Soto, Olivia Fragoso, and Juan Rojas
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Scheme (programming language) ,General Computer Science ,Database ,Java ,Application programming interface ,Computer science ,Data access object ,computer.internet_protocol ,020209 energy ,020207 software engineering ,02 engineering and technology ,computer.software_genre ,Metadata ,Unified Modeling Language ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,Object-relational mapping ,computer ,XML ,computer.programming_language - Abstract
Implementing the persistence layer is a task that the Object Relational Mapping (ORMs) tools have standardized through diverse frameworks and Application Programming Interfaces (APIs). However, these ORMs and APIs have some inconveniences related to their configuration process and the time and effort it takes to learn them, amongst others. For example, every time a database is used, a configuration process is realized to map the database to obtain Plain Old Java Objects (POJOs) and Data Access Objects (DAOs). In order to overcome those disadvantages, this work contributes by proposing a reusable and extensible process that supports the automatic generation of POJOs and DAOs from database scheme metadata, through the specification of an Extended Backus–Naur Form (EBNF) grammar. A tool named GenPOJO was developed in order to test the process. Unlike the existing ORMs, the proposed process does not require the configuration steps for each database. In addition, GenPOJO does not require time to learn since the only input it receives is a file in XML (eXtensible Markup Language) format containing the database scheme metadata.
- Published
- 2020
19. Detection of Dopamine in Human Fluids Using N-Doped Carbon Dots
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Mohammed Zougagh, Manuel Algarra, Juan Soto, Ángel Ríos, Marwa Louleb, Enrique Rodríguez-Castellón, and Latifa Latrous
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Quenching (fluorescence) ,Materials science ,chemistry ,Dopamine ,Doped carbon ,medicine ,Nanoparticle ,chemistry.chemical_element ,General Materials Science ,Photochemistry ,Nitrogen ,medicine.drug - Abstract
Herein, we fabricated nanoparticles of doped carbon dots with nitrogen (N-CDs) with an ecofriendly and easy approach, yielding spherical nanoparticles (mean size: 19 nm). N-CDs were further charact...
- Published
- 2020
20. Proving the Dual Electronic Structure of Charged Metal-Molecule Interfaces: Surface-Enhanced Raman Scattering of Cyanide Adsorbed on a Nanostructured Silver Electrode
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Juan C. Otero, Daniel Aranda, Juan Soto, Samuel Valdivia, Francisco J. Avila Ferrer, and Isabel López-Tocón
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Raman scattering ,Surface (mathematics) ,Electronic structure ,Silver ,Materials science ,Cyanide ,Metal nanoparticles ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Electrolysis ,Metal ,symbols.namesake ,chemistry.chemical_compound ,Adsorption ,Molecule ,Physical and Theoretical Chemistry ,Bond energy ,Electrodes ,Cyanides ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Electric potential ,General Energy ,chemistry ,Chemical physics ,visual_art ,symbols ,visual_art.visual_art_medium ,0210 nano-technology - Abstract
Experimental and theoretical calculations confirm, for the first time, the existence of two different kinds of electronic structures of a surface complex formed by a particular molecule bonded to charged metal electrodes, clusters, or nanoparticles. Surface-enhanced Raman scattering (SERS) of cyanine adsorbed on a silver electrode shows three regions, which are selected by the electrode potential and characterized by the differentiated response of the vibrational wavenumbers of the ?(CN) stretching band to the electrode potential. The combination between the experimental SERS and DFT calculations has allowed for relating the three regions to chemisorbed (C-hybrid) and physisorbed (P-hybrid) surface complexes, where cyanide is bonded through the carbon on top of a single silver atom of the surface and to bidentate species, respectively. The electrode potential selects one or another type of electronic structure of the surface complex, which are of different natures and with a differentiated response to the applied potential. The electric potential tunes smoothly the wavenumbers, bond energies, and injected charges of the P-hybrid at more negative potentials than that of the zero charge of the electrode, but the very strong C-hybrid prevents significant changes of these properties at positive excesses of charge. The existence of the dual electronic structure of metal-molecule interfaces might require reinterpreting experiments that are usually discussed by resorting to, for instance, the reorientation of the adsorbate, the formation of complexes with different stoichiometries, the existence of nonequivalent local sites on the surface, or to instrumental artifacts.
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- 2020
21. Electro-responsive films containing voltage responsive gated mesoporous silica nanoparticles grafted onto PEDOT-based conducting polymer
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Ramón Martínez-Máñez, Alba García-Fernández, María D. Marcos, Javier Monreal-Trigo, Miguel Alcañiz, Beatriz Lozano-Torres, Juan F. Blandez, Jorge E. Collazos-Castro, Juan Soto, and Félix Sancenón
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Voltage-gated MSNs ,Materials science ,Biocompatibility ,Polymers ,Conducting polymers ,Pharmaceutical Science ,Nanoparticle ,02 engineering and technology ,Electro-responsive ,TECNOLOGIA ELECTRONICA ,03 medical and health sciences ,chemistry.chemical_compound ,QUIMICA ORGANICA ,PEDOT:PSS ,BIOQUIMICA Y BIOLOGIA MOLECULAR ,Rhodamine B ,Humans ,Controlled release ,Conducting polymers, Controlled release, Electro-responsive, PEDOT, Voltage-gated MSNs ,PEDOT ,030304 developmental biology ,Conductive polymer ,chemistry.chemical_classification ,0303 health sciences ,QUIMICA INORGANICA ,Polymer ,Mesoporous silica ,Bridged Bicyclo Compounds, Heterocyclic ,Silicon Dioxide ,021001 nanoscience & nanotechnology ,chemistry ,Chemical engineering ,Saturated calomel electrode ,Nanoparticles ,0210 nano-technology ,Porosity ,HeLa Cells - Abstract
[EN] The characteristics and electromechanical properties of conductive polymers together to their biocompatibility have boosted their application as a suitable tool in regenerative medicine and tissue engineering. However, conducting polymers as drug release materials are far from being ideal. A possibility to overcome this drawback is to combine conducting polymers with on-command delivery particles with inherent high-loading capacity. In this scenario, we report here the preparation of conduction polymers containing gated mesoporous silica nanoparticles (MSN) loaded with a cargo that is delivered on command by electro-chemical stimuli increasing the potential use of conducting polymers as controlled delivery systems. MSNs are loaded with Rhodamine B (Rh B), anchored to the conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) doped with poly[(4-styrenesulfonic acid)-co-(maleic acid)], functionalized with a bipyridinium derivative and pores are capped with heparin (P3) by electrostatic interactions. P3 releases the entrapped cargo after the application of ¿640 mV voltage versus the saturated calomel electrode (SCE). Pore opening in the nanoparticles and dye delivery is ascribed to both (i) the reduction of the grafted bipyridinium derivative and (ii) the polarization of the conducting polymer electrode to negative potentials that induce detachment of positively charged heparin from the surface of the nanoparticles. Biocompatibility and cargo release studies were carried out in HeLa cells cultures., Alba Garcia-Fernandez, Beatriz Lozano-Torres contributed equally to this work. A. Garcia-Fernandez and B. Lozano-Torres are grateful to the "Ministerio de Economia y Competitividad" of the Spanish Government for her PhD fellowships. J. F. Blandez thanks the "Universitat Politecnica de Valencia" for his postdoctoral fellowship (PAID-10-17). The authors thank to the Spanish Government (Projects RTI2018-100910-B-C41 and RTI2018-101599-B-C22 (MCUI/AEI/FEDER, EU)) and the Generalitat Valencia (Project PROMETEO2018-024) for support.
- Published
- 2020
22. Humedad y su relación con la espectroscopía dieléctrica en agregados de concreto
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Juan Soto, Luis La Madrid, Franco Abanto, Gaby Ruiz, Gerson La Rosa, William Ipanaque, Pedro Rotta, and Jose Manrique
- Subjects
espectroscopía dieléctrica ,dielectric spectroscopy ,lcsh:T ,contenido de humedad ,moisture contentent ,General Medicine ,agregados de concreto ,lcsh:Technology ,microondas ,microwaves ,constante dieléctrica ,dielectric contant ,concrete aggregates ,lcsh:Science (General) ,lcsh:Q1-390 - Abstract
Medir el contenido de humedad (CH) de los agregados de concreto (ADC) en la fabricación de concreto premezclado es uno de los retos en la industria de la construcción porque afecta a las propiedades finales del concreto. Actualmente los métodos que se utilizan para medir el CH en ADC son invasivos y destructivos. Este artículo presenta una técnica moderna basada en espectroscopía dieléctrica (ED), un método que al propagar microondas en el material correlaciona su constante dieléctrica (CD) y su CH. En esta investigación se ha utilizado este método en ADC. Tres diferentes canteras peruanas de ADC (Moyobamba, Sol-Sol y Cerro Mocho) han sido utilizadas. Los resultados demuestran que el sensor a una frecuencia de 1.5 GHz es capaz de detectar el CH en ADC con una regresión lineal de R2 = 95 %. En conclusión, se puede utilizar la ED como un método de sensado no invasivo y en línea de CH en ADC para ser utilizado en la industria de la construcción.//Measurement of moisture content (CH) of concrete aggregates (AOC) in the manufactury of ready mixed concrete is one of the currently challenges in the building industry since affect to the final properties of concret. At present, the methods for measurement of CH in AOC are invasive and destructive. This paper presents a novel sensing technique using dielectric espectroscopy (ED), a method that using the propagation of microwaves on the material allows the correlation of its dielectric constant (CD) and its CH. In this research is used this method in AOC. Three diferents peruvian quarries (Moyobamba, Sol sol y Cerro Mocho) have been used. The results shows that the sensor at the frequency of 1.5GHz is capable of detecting the CH in AOC with linear regression of R2 = 95%. In conclusion, is available using the ED as a online and no invasive sensing method of CH in AOC for using in the building industry.
- Published
- 2020
23. Insights into the Thermal and Photochemical Reaction Mechanisms of Azidoacetonitrile. Spectroscopic and MS‐CASPT2 Calculations
- Author
-
Manuel Algarra and Juan Soto
- Subjects
Materials science ,Nitrene ,Isocyanide ,Imine ,Thermal decomposition ,02 engineering and technology ,Conical intersection ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Ab initio quantum chemistry methods ,Complete active space ,Singlet state ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
This work studies the photochemical and thermal decompositions of azidoacetonitrile (N3 CH2 CN) from both the experimental and theoretical points of view. The data of the photochemical experiments are taken from the literature, while the thermal decomposition have been carried out by us. In addition, we have performed ab initio calculations of the multiconfigurational type [complete active space self-consistent field (CASSCF) and the multistate multireference perturbation theory (MS-CASPT2)]. It is found that the first step of both type of decompositions is N2 elimination and formation of closed shell singlet nitrene. Afterwards, the nitrene tends to rapidly rearrange into formimidoyl cyanide (HNCHCN). As both reactions progress, the imine isomerizes into formimidoyl isocyanide (HNCHNC). The photoisomerization of the imine takes places thorough a conical intersection, while the same reaction on the ground electronic state occurs via a conventional transition state. The last step of the global reaction is decomposition of the imines into HCN and CNH. In photochemical conditions, the conjunction of the imines and its dissociation products (HCN and CNH) yields adenine.
- Published
- 2020
24. The impact of sex education mandates on teenage pregnancy: International evidence
- Author
-
Juan Soto, Stephen Bullivant, and David Paton
- Subjects
Adolescent ,Sexual Behavior ,media_common.quotation_subject ,Psychological intervention ,Fertility ,Sex Education ,Abortion ,Affect (psychology) ,Opt-out ,03 medical and health sciences ,Pregnancy ,0502 economics and business ,Humans ,050207 economics ,Demography ,Reproductive health ,media_common ,Teenage pregnancy ,business.industry ,030503 health policy & services ,Health Policy ,05 social sciences ,Pregnancy in Adolescence ,Female ,0305 other medical science ,business ,Psychology ,Developed country - Abstract
To date most studies of the impact of school-based sex education have focused either on specific, local interventions or experiences at a national level. In this paper, we use a new cross-country dataset to explore the extent to which laws on sex education affect teenage pregnancy rates in developed countries. We find some evidence that laws mandating sex education in schools are associated with higher rates of teenage fertility. Parental opt out laws may minimise adverse effects of sex education mandates for younger teens. The estimated effects of mandatory sex education are robust to some but not all of our specifications designed to tease out causality. Taken together, changes in national laws relating to sexual health are unable to explain the significant declines in teenage pregnancy rates, which have been observed in many developed countries in recent years.
- Published
- 2020
25. hiatus esofágico estudio anátomo quirúrgico
- Author
-
Juan Soto Blanco
- Subjects
diafragma ,RD1-811 ,Surgery ,esófago ,cirugía - Abstract
Presentado en sesión de 22 de mayo de 1957
- Published
- 2020
26. Homenaje al Profesor Domingo Prat
- Author
-
Eduardo C Palma and Juan Soto Blanco
- Subjects
uruguay ,homenajes ,RD1-811 ,Surgery ,biografías ,cirujanos - Abstract
La sociedad de Cirugía realizó el 31 de octubre de 1951 una sesión homenaje a Profesor Domingo Prat
- Published
- 2020
27. Conmemoración de los 25 años de la fundación de la Sociedad de Cirugía del Uruguay
- Author
-
Juan Soto Blanco
- Subjects
uruguay ,sociedades científicas ,RD1-811 ,Surgery ,cirugía - Abstract
Presentado en sesión noviembre 1945. Incluye discursos de Armando Loubejac, Carlos Stajano, Fernando Etchegorry
- Published
- 2020
28. Prof. Dr. Enrique Lamas Pouey
- Author
-
Juan Soto Blanco
- Subjects
uruguay ,RD1-811 ,Surgery ,biografías ,cirujanos - Abstract
Obituario y homenaje al Ex presidente de la Sociedad de Cirugía
- Published
- 2020
29. Discurso pronunciado por el Profesor Agregado Dr Juan Soto Blanco con motivo del homenaje al Prof Dr Horacio García Lagos al retirase de la Cátedra de Clínica Quirúrgica
- Author
-
Juan Soto Blanco
- Subjects
discursos ,uruguay ,RD1-811 ,Surgery ,cirujanos - Abstract
Presentado en sesión de 3 de mayo de 1944
- Published
- 2020
30. Anuria post-operatoria complicando una intervención pelviana, producida por acodamientos bilaterales de los ureteres en un caso de dolico - ureter - bilateral
- Author
-
Juan Soto Blanco
- Subjects
RD1-811 ,complicaciones ,ureter ,hemorragia ,Surgery ,sistema urinario ,cirugía - Abstract
Presentado en sesión de 12 de mayo de 1943
- Published
- 2020
31. Quistes hidatídicos de la región diafragmática derecha
- Author
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Juan Soto Blanco
- Subjects
RD1-811 ,Surgery - Abstract
Presentado en la Sesión del miércoles 23 de abril de 1946.
- Published
- 2020
32. Cuerpos encarnados en la virtualidad. En medio de juegos, actuaciones y cuidados de sí
- Author
-
Juan Soto Flechas
- Subjects
Facebook ,Cuerpos ,Corporalidades virtuales ,Subjetividades - Abstract
El artículo mostrará que elementos constitutivos se presentan en la construcción de los cuerpos y las subjetividades entre jóvenes universitarios, en el escenario virtual del Facebook. El cuerpo se entenderá como una construcción social y de sentido antes que como una entidad con una ontología biológica y esencial; en ese sentido, los cuerpos construidos están concebidos en constante cambio y en estrecha interacción con el medio virtual. Se tomó el modelo de la escenificación de sí de Goffman, lo mismo que a su vez, el de cuidado de sí de Foucault, para dar cuenta de estas formas particulares de corporalidad.
- Published
- 2022
- Full Text
- View/download PDF
33. Cuerpos encarnados en la virtualidad. En medio de juegos, actuaciones y cuidados de s��
- Author
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Flechas, Juan Soto
- Subjects
Facebook ,Cuerpos ,Corporalidades virtuales ,Subjetividades - Abstract
El art��culo mostrar�� que elementos constitutivos se presentan en la construcci��n de los cuerpos y las subjetividades entre j��venes universitarios, en el escenario virtual del Facebook. El cuerpo se entender�� como una construcci��n social y de sentido antes que como una entidad con una ontolog��a biol��gica y esencial; en ese sentido, los cuerpos construidos est��n concebidos en constante cambio y en estrecha interacci��n con el medio virtual. Se tom�� el modelo de la escenificaci��n de s�� de Goffman, lo mismo que a su vez, el de cuidado de s�� de Foucault, para dar cuenta de estas formas particulares de corporalidad.
- Published
- 2022
- Full Text
- View/download PDF
34. Biochemical changes in cancer cells induced by photoactive nanosystem based on carbon dots loaded with Ru-complex
- Author
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Maja D. Nešić, Tanja Dučić, Mara Gonçalves, Milutin Stepić, Manuel Algarra, Juan Soto, Branislava Gemović, Teresa J. Bandosz, and Marijana Petković
- Subjects
Ovarian Neoplasms ,Anticancer photodynamic therapy ,Biochemical changes ,General Medicine ,Toxicology ,N-doped carbon dots ,Carbon ,Cell Line, Tumor ,Quantum Dots ,Ru-metallodrug ,Carbon dots ,Humans ,Nanoparticles ,Female - Abstract
Carbon dots (CDs) and N-carbon dots (N-CDs) loaded with Ru-complex (CDs@RuCN, N-CDs@RuCN, respectively) were investigated as media imposing biochemical changes induced by UV illumination of ovarian cancer, A2780, and osteosarcoma, CAL72, cells. Synchrotron radiation-based Fourier Transform Infrared Spectroscopy was performed, and the spectra were subjected to a Principal Component Analysis. The CDs@RuCN and N-CDs@RuCN effects on cancer cells were analyzed by the theoretical modelling of the stability of the composite systems and a protein database search. Moreover, a detailed evaluation of surface and optical properties of CDs@RuCN and N-CDs@RuCN was carried out. Results demonstrated selective action of the CDs@RuCN and N-CDs@RuCN-based photodynamic therapy, with N-CDs@RuCN being the most active in inducing changes in A2780 and CDs@RuCN in CAL72 cells. We assume that different surface charges of nanoparticles led to direct interactions of N-CDs@RuCN with a Wnt signalling pathway in A2780 and those of CDs@RuCN with PI3–K/Akt in CAL72 cells and that further biochemical changes occurred upon light illumination.
- Published
- 2022
35. Nitrene formation is the first step of the thermal and photochemical decomposition reactions of organic azides
- Author
-
Juan Soto, Manuel Algarra, Daniel Peláez, Universidad Pública de Navarra. Departamento de Ciencias, Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa. INAMAT2 - Institute for Advanced Materials and Mathematics, and Nafarroako Unibertsitate Publikoa. Zientziak Saila
- Subjects
MS-CASPT2 ,General Physics and Astronomy ,Isopropyl nitrene ,Physical and Theoretical Chemistry ,Organiz azides ,CASSCF - Abstract
In this work, the decomposition of a prototypical azide, isopropyl azide, both in the ground and excited states, has been investigated through the use of multiconfigurational CASSCF and MS-CASPT2 electronic structure approaches. Particular emphasis has been placed on the thermal reaction starting at the S0 ground state surface. It has been found that the azide thermally decomposes via a stepwise mechanism, whose rate-determining step is the formation of isopropyl nitrene, which is, in turn, the first step of the global mechanism. After that, the nitrene isomerizes to the corresponding imine derivative. Two routes are possible for such a decomposition: (i) a spin-allowed path involving a transition state; and (ii) a spinforbidden one via a S0/T0 intersystem crossing. Both intermediates have been determined and characterised. Their associated relative energies have been found to be quite similar, 45.75 and 45.52 kcal mol1, respectively. To complete this study, the kinetics of the singlet and triplet channels are modeled with the MESMER (Master Equation Solver for Multi-Energy Well Reactions) code by applying the RRKM and Landau Zener (with WKB tunnelling correction) theories, respectively. It is found that the canonical rate-coefficients of the singlet path are 2-orders of magnitude higher than the ratecoefficients of the forbidden reaction. In addition, the concerted mechanism has been investigated that would lead to the formation of the imine derivative and nitrogen extrusion in the first step of the decomposition. After a careful analysis of CASSCF calculations with different active spaces and their comparison with single electronic configuration methods (MP2 and B3LYP), the concerted mechanism is discarded. This work has been supported by projects UMA18-FEDER-JA-049 and P18-RT-4592 of Junta de Andalucía and FEDER founds.
- Published
- 2022
36. Flavylium Cation Expression on Surface of Carbon Dots: Fluorescence Emission Without Excitation Dependence
- Author
-
Manuel Algarra, Celia Carrillo, Jose Jimenez Jimenez, Enrique Rodriguez Castellon, Teresa J. Bandosz, and Juan Soto
- Published
- 2022
37. Desafíos del aprendizaje profundo en la visión por computador
- Author
-
Victor Hugo Ayma Quirita, Pedro Marco Achanccaray Diaz, Smith Washington Arauco Canchumuni, and Pedro Juan Soto Vega
- Subjects
Pendiente - Abstract
La visión por computador es un área de estudio en la inteligencia artificial que se enfoca en el desarrollo de técnicas computacionales para percibir el mundo a través de entradas visuales, como videos o imágenes. El aprendizaje profundo ha demostrado ser una técnica eficiente para el análisis e interpretación de datos visuales. Sin embargo, afronta innumerables desafíos según su aplicación en las diferentes tareas de la visión por computador. Este panel reúne un grupo de expertos en aprendizaje profundo, quienes ofrecerán información sobre su aplicación y los desafíos en sus respectivas áreas de investigación con relación a la visión por computador.
- Published
- 2022
38. Caverna hidática pulmonar (Su tratamiento)
- Author
-
Juan Soto Blanco
- Subjects
pulmón ,RD1-811 ,quiste hidático ,Surgery - Abstract
Sesión del 21 de Noviembre de 1934.
- Published
- 2019
39. Sobre un caso de fractura espontánea
- Author
-
Juan Soto Blanco
- Subjects
RD1-811 ,miembros inferiores ,dolor ,fémur ,Surgery ,fracturas - Abstract
Presentado en la sesión del 8 de Junio de 1932
- Published
- 2019
40. Proposal for a mechanical model of mobile shales
- Author
-
M. Heidari, Juan Soto, and Michael R. Hudec
- Subjects
Multidisciplinary ,Database ,Computer science ,Science ,Tectonics ,Mechanical properties ,computer.software_genre ,Article ,Geophysics ,Medicine ,Rheology ,computer - Abstract
This paper has benefited greatly by the thorough and helpful comments and reviews by Chris Morley, Peter Connolly, and an anonymous reviewer. Andrea Billi is also thanked for his editorial support. We thank Nancy Cottington for initial figure drafting and Cari Breton for creating the map for Fig. 1. The project was funded by the Applied Geodynamics Laboratory (AGL) Industrial Associates program, comprising the following companies: Anadarko, Aramco Services, BHP Billiton, BP, CGG, Chevron, Condor, Ecopetrol, EMGS, ENI, ExxonMobil, Hess, Ion-GXT, Midland Valley, Murphy, Nexen USA, Noble, Petrobras, Petronas, PGS, Repsol, Rockfield, Shell, Spectrum, Equinor, Stone Energy, TGS, Total, WesternGeco, and Woodside (http://www.beg.utexas.edu/agl/sponsors).The ideas and content of this contribution have been strongly benefited from various fruitful discussions with colleagues such as Peter Flemings, Doug Jerolmack, Maria Nikolinakou, and Demian Saffer. Publication authorized by the Director, Bureau of Economic Geology, The University of Texas at Austin., Structural systems involving mobile shale represent one of the most difficult challenges for geoscientists dedicated to exploring the subsurface structure of continental margins. Mobile-shale structures range from surficial mud volcanoes to deeply buried shale diapirs and shale-cored folds. Where mobile shales occur, seismic imaging is typically poor, drilling is hazardous, and established principles to guide interpretation are few. The central problem leading to these issues is the poor understanding of the mechanical behaviour of mobile shales. Here we propose that mobile shales are at critical state, thus we define mobile shales as “bodies of clay-rich sediment or sedimentary rock undergoing penetrative, (visco-) plastic deformation at the critical state”. We discuss how this proposition can explain key observations associated with mobile shales. The critical-state model can explain the occurrence of both fluidized (no grain contact) shales (e.g., in mud volcanoes) and more viscous shales flowing with grain-to-grain contact (e.g., in shale diapirs), mobilization of cemented and compacted shales, and the role of overpressure in shale mobility. Our model offers new avenues for understanding complex and fascinating mobile-shale structures., Applied Geodynamics Laboratory (AGL) Industrial Associates program
- Published
- 2021
41. Nanoporous Alumina Support Covered by Imidazole Moiety–Based Ionic Liquids: Optical Characterization and Application
- Author
-
Manuel Algarra, Mª Cruz López Escalante, Mª Valle Martínez de Yuso, Juan Soto, Ana L. Cuevas, Juana Benavente, and Institute for Advanced Materials and Mathematics - INAMAT2
- Subjects
nanoporous alumina ,ionic liquids ,optical properties ,solar cell ,Optical properties ,General Chemical Engineering ,Solar cell ,Nanoporous alumina ,General Materials Science ,Ionic liquids - Abstract
This work analyzes chemical surface and optical characteristics of a commercial nanoporous alumina structure (NPAS) as a result of surface coverage by different imidazolium-based ionic liquids (1-butyl-3-metylimidazolium hexafluorophosphate, 3-methyl-1-octylimidazolium hexafluorophosphate, or 1-ethyl-3-methylimidazolium tetrafluoroborate). Optical characteristics of the IL/NPAS samples were determined by photoluminescence (at different excitation wavelengths (from 300 nm to 400 nm), ellipsometry spectroscopy, and light transmittance/reflectance measurements for a range of wavelengths that provide information on modifications related to both visible and near-infrared regions. Chemical surface characterization of the three IL/NPAS samples was performed by X-ray photoelectron spectroscopy (XPS), which indicates almost total support coverage by the ILs. The IL/NPAS analyzed samples exhibit different photoluminescence behavior, high transparency (
- Published
- 2022
42. Monofloral honey authentication by voltammetric electronic tongue: A comparison with
- Author
-
Beatriz, Lozano-Torres, M, Carmen Martínez-Bisbal, Juan, Soto, Marisol, Juan Borrás, Ramón, Martínez-Máñez, and Isabel, Escriche
- Subjects
Magnetic Resonance Spectroscopy ,Pollen ,Food Contamination ,Honey ,Least-Squares Analysis ,Electronic Nose - Abstract
Proton-nuclear-magnetic-resonance-spectroscopy (
- Published
- 2021
43. Society’s Perception-Based Characterization Factors for Mismanaged Polymers at End of Life
- Author
-
Guilherme Marcelo Zanghelini, Ricardo Augusto Dias, Edivan Cherubini, Yuki Hamilton Onda Kabe, and Jorge Juan Soto Delgado
- Subjects
Work (electrical) ,Risk analysis (engineering) ,business.industry ,Perception ,media_common.quotation_subject ,Environmental impact assessment ,Public opinion ,business ,Life-cycle assessment ,media_common - Abstract
Society’s perception of an environmental impact often turns it into the drive to measure, remediate and ultimately solve the perceived problem. In some cases, this situation is noticeable even before scientists can properly establish the cause-effect pathway, for example, plastic debris effect on the oceans. This work strives to understand how public opinion deals with this transitory gap of knowledge and how to measure society’s viewpoint through marine litter. A Life Cycle Assessment was addressed comparing reusable and single-use drinking straws, from which a “society’s perception based” characterization factor for mismanaged polymers at end of life was proposed. Results showed that the factor may reach up to 1 order of magnitude higher than the characterization factors of producing the polymer and may indicate that decisions with no data to support can lead to rebound effects.
- Published
- 2021
44. Downregulation of exhausted cytotoxic T cells in gene expression networks of multisystem inflammatory syndrome in children
- Author
-
Noam D. Beckmann, Nancy J. Francoeur, Diane Marie Del Valle, Gurpawan Kang, Anh Do, Emily Moya, Lillian Wilkins, Jessica Le Berichel, Christie Chang, Robert Marvin, Sharlene Calorossi, Phillip H. Comella, Alona Lansky, Laura Walker, Nancy Yi, Alex Yu, Jonathan Chung, Matthew Hartnett, Melody Eaton, Sandra Hatem, Hajra Jamal, Alara Akyatan, Esther Cheng, Alexandra Tabachnikova, Lora E. Liharska, Liam Cotter, Brian Fennessy, Akhil Vaid, Guillermo Barturen, Hardik Shah, Ying-chih Wang, Shwetha Hara Sridhar, Juan Soto, Lauren Lepow, Swaroop Bose, Kent Madrid, Ethan Ellis, Elyze Merzier, Konstantinos Vlachos, Nataly Fishman, Manying Tin, Melissa Smith, Hui Xie, Manishkumar Patel, Aviva G. Beckmann, Kai Nie, Kimberly Argueta, Jocelyn Harris, Neha Karekar, Craig Batchelor, Jose Lacunza, Mahlet Yishak, Kevin Tuballes, Ieisha Scott, Arvind Kumar, Scott R. Tyler, Suraj Jaladanki, Charuta Agashe, Ryan Thompson, Evan Clark, Bojan Losic, Lauren Peters, The Mount Sinai COVID-19 Biobank Team, Panagiotis Roussos, Jun Zhu, Wenhui Wang, Konstantinos Mouskas, Andrew Kasarskis, Benjamin S. Glicksberg, Girish Nadkarni, Dusan Bogunovic, Cordelia Elaiho, Sandeep Gangadharan, George Ofori-Amanfo, Kasey Alesso-Carra, Kenan Onel, Karen M. Wilson, Nicole W. Simons, Carmen Argmann, Supinda Bunyavanich, Marta E. Alarcón-Riquelme, Thomas U. Marron, Adeeb Rahman, Seunghee Kim-Schulze, Sacha Gnjatic, Bruce D. Gelb, Miriam Merad, Robert Sebra, Gabriel E. Hoffman, Eric E. Schadt, and Alexander W. Charney
- Subjects
Male ,TBX21 ,Cell type ,Adolescent ,Science ,Down-Regulation ,General Physics and Astronomy ,Inflammation ,CD8-Positive T-Lymphocytes ,Mucocutaneous Lymph Node Syndrome ,Biology ,General Biochemistry, Genetics and Molecular Biology ,Pathogenesis ,Transcriptome ,Young Adult ,CD57 Antigens ,Downregulation and upregulation ,otorhinolaryngologic diseases ,medicine ,Humans ,Cytotoxic T cell ,Child ,Multidisciplinary ,SARS-CoV-2 ,Infant, Newborn ,COVID-19 ,Infant ,General Chemistry ,CD56 Antigen ,Systemic Inflammatory Response Syndrome ,Killer Cells, Natural ,Child, Preschool ,Immunology ,Female ,medicine.symptom ,CD8 - Abstract
Multisystem inflammatory syndrome in children (MIS-C) presents with fever, inflammation and pathology of multiple organs in individuals under 21 years of age in the weeks following severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. Although an autoimmune pathogenesis has been proposed, the genes, pathways and cell types causal to this new disease remain unknown. Here we perform RNA sequencing of blood from patients with MIS-C and controls to find disease-associated genes clustered in a co-expression module annotated to CD56dimCD57+ natural killer (NK) cells and exhausted CD8+ T cells. A similar transcriptome signature is replicated in an independent cohort of Kawasaki disease (KD), the related condition after which MIS-C was initially named. Probing a probabilistic causal network previously constructed from over 1,000 blood transcriptomes both validates the structure of this module and reveals nine key regulators, including TBX21, a central coordinator of exhausted CD8+ T cell differentiation. Together, this unbiased, transcriptome-wide survey implicates downregulation of NK cells and cytotoxic T cell exhaustion in the pathogenesis of MIS-C., Multisystem inflammatory syndrome in children (MIS-C) onsets in COVID-19 patients with manifestations similar to Kawasaki disease (KD). Here the author probe the peripheral blood transcriptome of MIS-C patients to find signatures related to natural killer (NK) cell activation and CD8+ T cell exhaustion that are shared with KD patients.
- Published
- 2021
45. Life Cycle Assessment of the Catalytic Pyrolysis of High‐Density Polyethylene (HDPE) and High‐Impact Polystyrene (HIPS)
- Author
-
Alessandra da R. Duailibe Monteiro, Débora Micheline Vaz de Miranda, José Carlos Costa da Silva Pinto, and Jorge Juan Soto
- Subjects
Polymers and Plastics ,General Chemical Engineering ,General Chemistry - Published
- 2022
46. Technology, geography, and diversification in a small mineral economy
- Author
-
Marcelo Lufin and Juan Soto-Díaz
- Subjects
Geography, Planning and Development ,Economic Geology ,Management, Monitoring, Policy and Law ,Development - Published
- 2022
47. DEEP LEARNING-BASED DOMAIN ADAPTATION FOR CHANGE DETECTION IN TROPICAL FORESTS
- Author
-
PEDRO JUAN SOTO VEGA
- Published
- 2021
48. Polymer Composites for Thermal Energy Storage
- Author
-
James Palko, Christian Lopez Garcia, Ruben Juan Soto, Roman Giglio, and Souvik Roy
- Published
- 2021
49. Hybrid Evaluation for Distributed Iterative Matrix Computation
- Author
-
Chen Xu, Juan Soto, Weining Qian, Volker Markl, Aoying Zhou, and Zihao Chen
- Subjects
Data processing ,Iterative and incremental development ,Numerical linear algebra ,Distributed Computing Environment ,ScaLAPACK ,Computer science ,02 engineering and technology ,Parallel computing ,computer.software_genre ,Partition (database) ,Matrix (mathematics) ,Overhead (business) ,020204 information systems ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,computer - Abstract
Distributed matrix computation is common in large-scale data processing and machine learning applications. Existing systems that support distributed matrix computation already explore incremental evaluation for iterative-convergent algorithms. However, they are oblivious to the fact that non-zero increments are scattered in different blocks in a distributed environment. Additionally, we observe that incremental evaluation does not always outperform full evaluation. To address these issues, we propose matrix reorganization to optimize the physical layout upon the state-of-art optimized partition schemes, and thereby accelerate the incremental evaluation. More importantly, we propose a hybrid evaluation to efficiently interleave full and incremental evaluation during the iterative process. In particular, it employs a cost model to compare the overhead costs of two types of evaluations and a selective comparison mechanism to reduce the overhead incurred by comparison itself. To demonstrate the efficiency of our techniques, we implement HyMAC, a hybrid matrix computation system based on SystemML. Our experiments show that HyMAC reduces execution time on large datasets by 23% on average in comparison to the state-of-art optimization technique and consequently outperforms SystemML, ScaLAPACK, and SciDB by an order of magnitude.
- Published
- 2021
50. DEEP LEARNING-BASED DOMAIN ADAPTATION FOR CHANGE DETECTION IN TROPICAL FORESTS
- Author
-
PEDRO JUAN SOTO VEGA, RAUL QUEIROZ FEITOSA, GILSON ALEXANDRE OSTWALD PEDRO DA COSTA, MARLEY MARIA BERNARDES REBUZZI VELLASCO, and LEONARDO ALFREDO FORERO MENDOZA
- Abstract
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO Os dados de observação da Terra são freqüentemente afetados pelo fenômeno de mudança de domínio. Mudanças nas condições ambientais, variabilidade geográfica e diferentes propriedades de sensores geralmente tornam quase impossível empregar classificadores previamente treinados para novos dados sem experimentar uma queda significativa na precisão da classificação. As técnicas de adaptação de domínio baseadas em modelos de aprendizado profundo têm se mostrado úteis para aliviar o problema da mudança de domínio. Trabalhos recentes nesta área fundamentam-se no treinamento adversárial para alinhar os atributos extraídos de imagens de diferentes domínios em um espaço latente comum. Outra forma de tratar o problema é empregar técnicas de translação de imagens e adaptá-las de um domínio para outro de forma que as imagens transformadas contenham características semelhantes às imagens do outro domínio. Neste trabalho, propõem-se abordagens de adaptação de domínio para tarefas de detecção de mudanças, baseadas em primeiro lugar numa técnica de traslação de imagens, Cycle-Consistent Generative Adversarial Network (CycleGAN), e em segundo lugar, num modelo de alinhamento de atributos: a Domain Adversarial Neural Network (DANN). Particularmente, tais técnicas foram estendidas, introduzindo-se restrições adicionais na fase de treinamento dos componentes do modelo CycleGAN, bem como um procedimento de pseudo-rotulagem não supervisionado para mitigar o impacto negativo do desequilíbrio de classes no DANN. As abordagens propostas foram avaliadas numa aplicação de detecção de desmatamento, considerando diferentes regiões na floresta amazônica e no Cerrado brasileiro (savana). Nos experimentos, cada região corresponde a um domínio, e a precisão de um classificador treinado com imagens e referências de um dos domínio (fonte) é medida na classificação de outro domínio (destino). Os resultados demonstram que as abordagens propostas foram bem sucedidas em amenizar o problema de desvio de domínio no contexto da aplicação alvo. Earth observation data are frequently affected by the domain shift phenomenon. Changes in environmental conditions, geographical variability and different sensor properties typically make it almost impossible to employ previously trained classifiers for new data without a significant drop in classification accuracy. Domain adaptation (DA) techniques based on Deep Learning models have been proven useful to alleviate domain shift. Recent improvements in DA technology rely on adversarial training to align features extracted from images of the different domains in a common latent space. Another way to face the problem is to employ image translation techniques, and adapt images from one domain in such a way that the transformed images contain characteristics that are similar to the images from the other domain. In this work two different DA approaches for change detection tasks are proposed, which are based on a particular image translation technique, the Cycle-Consistent Generative Adversarial Network (CycleGAN), and on a representation matching strategy, the Domain Adversarial Neural Network (DANN). In particular, additional constraints in the training phase of the original CycleGAN model components are proposed, as well as an unsupervised pseudo-labeling procedure, to mitigate the negative impact of class imbalance in the DANN-based approach. The proposed approaches were evaluated on a deforestation detection application, considering different sites in the Amazon rain-forest and in the Brazilian Cerrado (savanna) biomes. In the experiments each site corresponds to a domain, and the accuracy of a classifier trained with images and references from one (source) domain is measured in the classification of another (target) domain. The experimental results show that the proposed approaches are successful in alleviating the domain shift problem.
- Published
- 2021
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