The Degree and regularity of vanishing ideals of algebraic toric sets over finite fields

Let X* be a subset of an affine space A^s, over a finite field K, which is parameterized by the edges of a clutter. Let X and Y be the images of X* under the maps x --> [x] and x --> [(x,1)] respectively, where [x] and [(x,1)] are points in the projective spaces P^{s-1} and P^s respectively. For certain clutters and for connected graphs, we were able to relate the algebraic invariants and properties of the vanishing ideals I(X) and I(Y). In a number of interesting cases, we compute its degree and regularity. For Hamiltonian bipartite graphs, we show the Eisenbud-Goto regularity conjecture. We give optimal bounds for the regularity when the graph is bipartite. It is shown that X* is an affine torus if and only if I(Y) is a complete intersection. We present some applications to coding theory and show some bounds for the minimum distance of parameterized linear codes for connected bipartite graphs

LipoBots : using liposomal vesicles as protective shell of urease-based nanomotors

Developing self-powered nanomotors made of biocompatible and functional components is of paramount importance in future biomedical applications. Herein, the functional features of LipoBots (LBs) composed of a liposomal carrier containing urease enzymes for propulsion, including their protective properties against acidic conditions and their on-demand triggered activation, are reported. Given the functional nature of liposomes, enzymes can be either encapsulated or coated on the surface of the vesicles. The influence of the location of urease on motion dynamics is first studied, finding that the surface-urease LBs undergo self-propulsion whereas the encapsulated-urease LBs do not. However, adding a percolating agent present in the bile salts to the encapsulated-urease LBs triggers active motion. Moreover, it is found that when both types of nanomotors are exposed to a medium of similar pH found in the stomach, the surface-urease LBs lose activity and motion capabilities, while the encapsulated-urease LBs retain activity and mobility. The results for the protection enzyme activity through encapsulation within liposomes and in situ triggering of the motion of LBs upon exposure to bile salts may open new avenues for the use of liposome-based nanomotors in drug delivery, for example, in the gastrointestinal tract, where bile salts are naturally present in the intestine

El conflicto entre la educación pública y los colegios católicos

Esta investigación nos lleva por un recorrido sobre la Guerra Cristera, sobre todo en el segundo periodo, de 1934 a 1938, cuando la educación se convierte en el asunto principal de este conflicto entre el Estado y la Iglesia católica. Se describirán las causas que provocó esta batalla donde las armas no tienen lugar, en cambio los libros son la principal herramienta de cambio para educar las mentes de los niños y jóvenes tapatíos con estudios socialistas, quitando cualquier doctrina religiosa, con el propósito de que la educación sea un parteaguas para el crecimiento laboral y social del país

Effect of Defoliation Frequency on Forage Yield from Intensive Silvopastoral Systems Compared to a Monoculture Grassland

Livestock production in the tropical regions of the world faces serious constraints as a result of climate change. Monoculture based pastures require the use of large amounts of nitrogen fertilizers to sustain production throughout the year. In general terms, tropical grasses are of low quality and when consumed by ruminant species, contribute to the emission of greenhouse gases (methane, carbon dioxide and nitrous oxide) (Herrero et al. 2009; Place et al. 2009). The establishment of intensive silvopastoral systems (iSPS) with associated shrubs legumes and grasses can increase the yield and quality of forage as well as fixation and transfer of atmospheric nitrogen (N) (Murgueitio et al. 2011). Therefore, the costs of nitrogen fertilizers and the emissions of greenhouse gases under practical conditions can be reduced. The intensive silvopastoral system is a kind of agroforestal practice that it is environmentally friendly and at the same time improves productivity of livestock systems. However, several aspects of its management have not been fully evaluated. This is the case of the response to defoliation, which is an important management factor associated to the overall biomass productivity (Solorio 2005)

Alta frecuencia de sintomatología depresiva en cuidadores de pacientes pediátricos en diálisis peritoneal y hemodiálisis en un hospital público de Lima.

Objective: To describe the frequency of depressive symptomatology in caregivers of pediatric patients on peritoneal dialysis and hemodialysis. Material and methods: Descriptive, cross-sectional study of 33 caregivers of pediatric patients with Chronic Kidney Disease, under treatment in the Hemodialysis and Peritoneal Dialysis Unit of the Cayetano Heredia Hospital in Lima (Peru). The participants completed the Patient Health Questionnaire (PHQ-9), which assessed their degree of depressive symptomatology. Results: A total of 54.54% of caregivers showed depressive symptomatology; 9.09% moderately severe, 18.18% moderate and 27.27% mild; only 3.03% reported intake of antidepressants. All caregivers with moderate and moderately severe depression reported some degree of difficulty in performing their tasks. Conclusions: A high frequency of depressive symptomatology in caregivers of pediatric patients on dialysis was found. The recognition of depression in primary caregivers is important, in order to carry out interventions aimed at maintaining their emotional well-being.Objetivo: El objetivo del estudio fue describir la frecuencia de sintomatología depresiva en cuidadores de pacientes pediátricos en diálisis peritoneal y hemodiálisis. Material y Métodos: Estudio descriptivo de corte transversal en el cual participaron 33 cuidadores de pacientes pediátricos con enfermedad renal crónica de la unidad de hemodiálisis y diálisis peritoneal del Hospital Cayetano Heredia en Lima (Perú). El nivel de sintomatología depresiva de los cuidadores fue evaluado mediante el Patient Health Questionnaire (PHQ-9). Resultados: Un total de 54,54% de cuidadores presentaron sintomatología depresiva; el 9,09% moderadamente severa, el 18,18% moderada y el 27,27% leve; solo el 3,03% reportó uso de antidepresivos. Todos los cuidadores con depresión moderada y moderadamente severa reportaron algún grado de dificultad para realizar sus labores. Conclusiones: Se evidenció una alta frecuencia de sintomatología depresiva en cuidadores de pacientes pediátricos en diálisis. El reconocimiento de la depresión en los cuidadores principales es importante a fin de conducir intervenciones dirigidas a la preservación de su bienestar emocional

Tuning graphitic carbon nitride (g-C3N4) electrocatalysts for efficient oxygen evolution reaction (OER)

Nowadays, energy conversion and storage technologies are essential research topics due to the necessity of more sustainable processes. Specifically, water splitting is highly affected by slow kinetics and limited knowledge of the oxygen evolution reaction (OER). This work envisages the preparation of graphitic carbon nitride (g-C3N4) electrocatalysts for efficient OER by a facile one-pot method. The impact of the preparation temperature (450–650 ◦C) of g-C3N4 was assessed for the first time on water splitting processes and explained by different characterisation techniques. The unique crystal structure, surface chemistry, and electronic properties of the material prepared at 550 ◦C lead to a remarkable OER efficiency, with an overpotential of 355 mV at 10 mA cm− 2 and a Tafel slope of 46.8 mV dec− 1. Interestingly, three major differences were observed when comparing the material prepared at 550 ◦C with those obtained at other temperatures: the reduced structural distortion, the superior composition in oxygen and the presence of terminal functional groups. Also, compared to other metalfree g-C3N4 electrocatalysts reported in the literature, we achieved lower Tafel slope values without additional post-treatments or co-catalysts. Hence, for the first time a metal-free catalyst defeats benchmark IrO2. The prepared electrodes were stable for up to 45 h, even when increasing the applied current density to 100 mA cm− 2 for 15 h. Thus, this work provides a simple route for the fabrication of highly-efficient and long-lasting electrocatalysts for a remarkable OER performance.Agencia Estatal de Investigación | Ref. PID2020-113667 GB-I00Fundação para a Ciência e a Tecnologia | Ref. UIDB/50020/2020Fundação para a Ciência e a Tecnologia | Ref. UIDP/50020/2020Xunta de Galicia | Ref. ED481D-2023/015Universidade de Vigo/CISU

Identification and quantification of carbamate pesticides in dried lime tree flowers by means of excitation-emission molecular fluorescence and parallel factor analysis when quenching effect exists

A non-separative, fast and inexpensive spectrofluorimetric method based on the second order calibration of excitation-emission fluorescence matrices (EEMs) was proposed for the determination of carbaryl, carbendazim and 1-naphthol in dried lime tree flowers. The trilinearity property of three-way data was used to handle the intrinsic fluorescence of lime flowers and the difference in the fluorescence intensity of each analyte. It also made possible to identify unequivocally each analyte. Trilinearity of the data tensor guarantees the uniqueness of the solution obtained through parallel factor analysis (PARAFAC), so the factors of the decomposition match up with the analytes. In addition, an experimental procedure was proposed to identify, with three-way data, the quenching effect produced by the fluorophores of the lime flowers. This procedure also enabled the selection of the adequate dilution of the lime flowers extract to minimize the quenching effect so the three analytes can be quantified. Finally, the analytes were determined using the standard addition method for a calibration whose standards were chosen with a D-optimal design. The three analytes were unequivocally identified by the correlation between the pure spectra and the PARAFAC excitation and emission spectral loadings. The trueness was established by the accuracy line “calculated concentration versus added concentration” in all cases. Better decision limit values (CCα), in x0 = 0 with the probability of false positive fixed at 0.05, were obtained for the calibration performed in pure solvent: 2.97 μg L−1 for 1-naphthol, 3.74 μg L−1 for carbaryl and 23.25 μg L−1 for carbendazim. The CCα values for the second calibration carried out in matrix were 1.61, 4.34 and 51.75 μg L−1 respectively; while the values obtained considering only the pure samples as calibration set were: 2.65, 8.61 and 28.7 μg L−1, respectively.theMinisteriodeEconomíayCompetitividad(CTQ2011-26022) and JuntadeCastillayLeón(BU108A11-2

A 5LCHB Inverter for PV transformerless applications with reduced leakage ground current

Transformerless inverters for photovoltaic systems are widely used as it features low cost, volume, and weight. Thus, in recent years, its study has been of great interest to the research community. In this paper a transformerless cascade multilevel inverter for photovoltaic applications with leakage ground current compensation capability is presented. The proposed solution involves a second-order LC output filter with a particular connection, which is referred to as the DC-link-tied LC output filter. This solution is aimed to deal with the leakage-ground current issue, regardless of the considered PWM strategy. The mathematical model of the system involving such a particular LC output passive filter configuration is presented, out of which, both the differential-mode and the common-mode models are obtained. These models are used to explain the leakage-ground current improvement of the proposed DC-link-tied LC output filter. This hardware solution is evaluated under different modulation schemes to contrast the converter output response and the leakage-ground current performance. Finally, simulation and experimental results are performed using a 1 kW academic prototype to assess the performance of the proposed DC-link-tied LC output filter used in a transformerless inverter application.Peer ReviewedObjectius de Desenvolupament Sostenible::7 - Energia Assequible i No ContaminantObjectius de Desenvolupament Sostenible::11 - Ciutats i Comunitats SosteniblesPostprint (published version

OVA a la mesa. Tecnología para los modales en la mesa/ OVA to the table. Technology for table manners.

Este articulo describe como se diseña un Objeto Virtual de Aprendizaje para los buenos modales en la mesa, incluye contenidos de aprendizaje con animaciones y actividades interactivas que permiten validar esos contenidos, además de elementos de contextualización que posibilitan de una manera fácil a estudiantes de todos los niveles de educación aprender sobre este tema.ABSTRACT:This article describes how to design a Virtual Learning Object for good table manners, learning content including animations and interactive activities to validate that content plus context elements that enable an easy way for students of all education levels learn about this subject

OVA a la mesa. Tecnología para los modales en la mesa/ OVA to the table. Technology for table manners.

Este articulo describe como se diseña un Objeto Virtual de Aprendizaje para los buenos modales en la mesa, incluye contenidos de aprendizaje con animaciones y actividades interactivas que permiten validar esos contenidos, además de elementos de contextualización que posibilitan de una manera fácil a estudiantes de todos los niveles de educación aprender sobre este tema. ABSTRACT: This article describes how to design a Virtual Learning Object for good table manners, learning content including animations and interactive activities to validate that content plus context elements that enable an easy way for students of all education levels learn about this subject