Miracle-dz/UniFAR-FTUs huggingface dataset:
Síntesis de nanopartículas metálicas y de zeolitas para catálisis y separación de gases

Las nanoparticulas ofrecen una serie de caracteristicas muy interesantes que posibilitan su aplicacion en una notable variedad de campos de un gran interes aplicado, como son el desarrollo de catalizadores eficientes para procesos de hidrogenacion u oxidacion selectiva y la preparacion de membranas de zeolita a partir de nanocristales de zeolita. En lo referente a la preparacion de catalizadores, se han preparado nanoparticulas metalicas siguiendo dos procedimientos: una sintesis coloidal basada en la reduccion de cationes metalicos mediante un disolvente organico en la que se prepararon nanoparticulas tanto mono- como bimetalicas, y una sintesis electroquimica, en la que se han empleado diferentes procedimientos para la sintesis de nanoparticulas. En el primer caso, los coloides sintetizados se depositaron sobre una amplia gama de soportes inorganicos, desde materiales carbonosos con diferentes estructuras y texturas superficiales hasta ceramicos de diferente naturaleza quimica. Algunos de los soportes se prepararon expresamente para la sintesis de catalizadores, como los materiales mesoporosos ordenados MCM-41 y Al-MCM-41. Ademas se ha desarrollado una metodologia novedosa para la incorporacion directa de las nanoparticulas preparadas en el seno de matrices mesoporosas, que hemos denominado sintesis simultanea. Los catalizadores preparados se usaron en la reaccion de hidrogenacion selectiva (semihidrogenacion) del fenilacetileno. Las nanoparticulas metalicas preparadas por metodos electroquimicos fueron sintetizadas sobre una serie de materiales carbonosos. Los electrodos cubiertos con Pt se emplearon en la oxidacion electroquimica de metanol, poniendo de manifiesto la importancia de la porosidad y accesibilidad del soporte para resultar en un catalizador eficiente. Por ultimo, el uso de nanocristales de zeolita para su uso como nucleos de crecimiento para la sintesis de membranas de zeolita A ha resultado ser una herramienta muy util para (1) posibilitar la sintesis de una zeolita muy hidrofila sobre un soporte hidrofobo y (2) acortar de una forma muy significativa el tiempo necesario para obtener una pelicula continua de zeolita mediante sintesis hidrotermica. Asimismo, la tecnica conocida como deposito electroforetica (EPD) ha demostrado ser una metodologia sencilla y muy eficiente para el deposito controlado de dichos nanocristales de zeolita, permitiendo un elevado grado de control sobre la cantidad de cristales semilla depositados con un equipamiento sumamente sencillo. Los materiales sintetizados se emplearon en el enriquecimiento de aire (separacion de una mezcla de aire sintetico).
Modeling Graphene in the Finite-Difference Time-Domain Method Using a Surface Boundary Condition

An effective approach for finite-difference time-domain modeling of graphene as a conducting sheet is proposed. First, we present a new technique for implementing a conducting surface boundary condition in the FDTD method; then, the dispersive surface conductivity of graphene is imposed. Numerical examples are presented to show the stability, accuracy, applicability, and advantages of the proposed approach. Validation is achieved by comparison with existing analytic methods.
Design and Implementation of High Performance , Low Dead Zone Phase Frequency Detector in CMOS PLL based Frequency Synthesizer for Wireless Applications

An area efficient, high performance, low dead zone phase frequency detector for high frequency phase-locked loop is presented in this paper. We have designed and developed the phase frequency detector circuit using 180nm process technology in CADENCE Virtuoso Analog Design Environment. The various performance parameters have been obtained through different types of simulation. While designing we have worked on mainly power supply, power dissipation, wide input frequency range, dead zone size and active layout area. The basic PFD consumes 33.5 μW at 500 MHz operating frequency whereas the proposed PFD with GDI cell consumes only 8 μW at 5GHz. The simulation results show that the circuit offered an alternative for any high speed and low power PLL applications. Keywords—CADENCE, CP, Dead zone, GDI, low power, PLL, PFD, VCO.
Inverse space-dependent perfusion coefficient identification

The identification of the space-dependent perfusion coefficient in the one-dimensional transient bio-heat conduction equation is investigated. In this inverse coefficient identification problem, the additional measurement necessary to render a unique solution is a boundary temperature measurement. A numerical approach based on a Crank-Nicolson finite-difference scheme combined with Tikhonov's regularization methods is developed. Numerical results are presented and discussed.
Insulin-mediated sympathetic stimulation: role in the pathogenesis of obesity-related hypertension (or, how insulin affects blood pressure, and why)

Thus, the evidence summarized here supports an important role for insulin and the sympathetic nervous system in the pathogenesis of obesity-related hypertension. Is it possible that insulin-mediated sympathetic stimulation contributes a pro-hypertensive effect in non-obese as well? It seems possible in young borderline hypertensives where sympathetically mediated thermogenic mechanisms are potent enough to compensate for the increased caloric intake, thereby enabling these young hypertensives to avoid obesity. This is consistent with an observation made in the original Framingham cohort that not only did obesity predict the eventual development of hypertension, but hypertension, as well, predicted the eventual development of obesity. A reasonable interpretation of these data suggests that as subjects age and the effectiveness of thermogenic mechanisms wanes, obesity might develop as a consequence of increased caloric intake no longer effectively buffered by the increased SNS activity. It is important to note that the mechanisms described here exert a pro-hypertensive effect and cannot properly be considered to 'cause' hypertension. Hypertension is rarely the consequence of a single mechanism. It is also true, as pointed out convincingly by Julius and his colleagues, that enhanced sympathetic activity, as a primary factor, can be associated with both hypertension, insulin resistance and, possibly, obesity [39]. And, finally, it should be noted that the mechanism described here is not the only mechanism linking obesity and hypertension. A rapidly emerging body of evidence indicates that leptin, the polypeptide product of the ob/ob gene secreted from adipose tissue, exerts potent central neural effects on both appetite and sympathetic activity. Leptin levels, elevated in obese humans, have the potential to increase both sympathetic activity and blood pressure [40-43]. A more comprehensive summary of the relationships between hypertension and obesity may, therefore, involve insulin and leptin, as well as the SNS, as represented in the schema presented in Figure 7. Both leptin and insulin may, therefore, be considered as compensatory mechanisms recruited to restore energy balance, with the SNS as one of the effector arms. Viewed in this way, obesity-related hypertension is inextricably linked to the metabolic economy of the obese.
AUXIN BINDING PROTEIN1 Links Cell Wall Remodeling, Auxin Signaling, and Cell Expansion in Arabidopsis[W]

This work examines the consequences of inactivation of the auxin receptor AUXIN BINDING PROTEIN1 and identifies alterations in the transcriptome, cell expansion, cell wall remodeling, and xyloglucan structure. It also reveals the importance of modifications of xyloglucan structure in the cell wall for cell expansion. Cell expansion is an increase in cell size and thus plays an essential role in plant growth and development. Phytohormones and the primary plant cell wall play major roles in the complex process of cell expansion. In shoot tissues, cell expansion requires the auxin receptor AUXIN BINDING PROTEIN1 (ABP1), but the mechanism by which ABP1 affects expansion remains unknown. We analyzed the effect of functional inactivation of ABP1 on transcriptomic changes in dark-grown hypocotyls and investigated the consequences of gene expression on cell wall composition and cell expansion. Molecular and genetic evidence indicates that ABP1 affects the expression of a broad range of cell wall–related genes, especially cell wall remodeling genes, mainly via an SCFTIR/AFB-dependent pathway. ABP1 also functions in the modulation of hemicellulose xyloglucan structure. Furthermore, fucosidase-mediated defucosylation of xyloglucan, but not biosynthesis of nonfucosylated xyloglucan, rescued dark-grown hypocotyl lengthening of ABP1 knockdown seedlings. In muro remodeling of xyloglucan side chains via an ABP1-dependent pathway appears to be of critical importance for temporal and spatial control of cell expansion.
Novel method to calculate pulmonary compliance images in rodents from computed tomography acquired at constant pressures

Our goal was to develop a method for generating high-resolution three-dimensional pulmonary compliance images in rodents from computed tomography (CT) images acquired at a series of constant pressures in ventilated animals. One rat and one mouse were used to demonstrate this technique. A pre-clinical GE flat panel CT scanner (maximum 31 line-pairs cm−1 resolution) was utilized for image acquisition. The thorax of each animal was imaged with breath-holds at 2, 6, 10, 14 and 18 cm H2O pressure in triplicate. A deformable image registration algorithm was applied to each pair of CT images to map corresponding tissue elements. Pulmonary compliance was calculated on a voxel by voxel basis using adjacent pairs of CT images. Triplicate imaging was used to estimate the measurement error of this technique. The 3D pulmonary compliance images revealed regional heterogeneity of compliance. The maximum total lung compliance measured 0.080 (±0.007) ml air per cm H2O per ml of lung and 0.039 (±0.004) ml air per cm H2O per ml of lung for the rat and mouse, respectively. In this study, we have demonstrated a unique method of quantifying regional lung compliance from 4 to 16 cm H2O pressure with sub-millimetre spatial resolution in rodents.
AÇÃO RESIDUAL DO HERBICIDA IMAZAPYR APLICADO EM CANAL DE IRRIGAÇÃO SOBRE A CULTURA DO ARROZ

O controle de plantas infestantes em canais de irrigacao com a utilizacao de herbicidas e uma pratica eficaz, rapida e de custo baixo. Porem, a presenca de residuos de herbicidas pode inviabilizar a aplicacao, devido a possiveis danos a cultura a ser irrigada. O objetivo do presente estudo foi investigar a acao residual do herbicida imazapyr em agua de canal de irrigacao, sobre a germinacao e crescimento inicial de arroz. Para isso, foram realizados experimentos conduzidos a campo e em casa de vegetacao, nos anos agricolas de crescimento 1995/96 e 1996/97. A campo, o herbicida foi aplicado na dose de 750 g i. a. ha-1 sobre especies infestantes de canais de irrigacao, quando este se encontrava totalmente drenado. Quinze dias apos a aplicacao, inundou-se o canal e, a partir da mesma data, foram efetuadas coletas de agua aos 0, 1, 3 e 6 dias no primeiro ano, acrescendo-se duas datas de coleta aos 13 e 20 dias para o segundo ano. Como testemunha comparativa utilizou-se agua coletada em canal proximo. A agua coletada foi armazenada em recipientes plasticos e mantida a temperatura de 6±2 oC. Em casa de vegetacao, foi semeada a cultivar de arroz BR-IRGA 410, em vasos com capacidade de 1 L de solo. A irrigacao do arroz com tratamento diferenciado pelo dia da coleta, das aguas nas areas tratada e nao tratada, tiveram inicio em pre e pos-emergencia. As variaveis avaliadas foram: estatura de plantas, comprimento radicular e materia seca da parte aerea e sistema radicular. A presenca do herbicida na agua afetou negativamente todas as variaveis avaliadas e mais intensamente quando a irrigacao teve inicio em pre-emergencia do arroz. Apos a inundacao do canal de irrigacao, o herbicida imazapyr manteve ainda, sua atividade ate o vigesimo dia de contato com a agua.
Role of excipients and polymeric advancements in preparation of floating drug delivery systems

Since decade or two, the development of floating drug delivery systems becomes a significant and novel tool as having low density than gastric content. There are various advanced polymers including chitosan, eudragit, etc., and excipients such as; pore forming agent, surfactants, etc. All of them are discussed briefly, and results are concluded from various reputed researches. We have discussed all natural and synthetic systems with their effect on the release and other parameters which are essential for the floating formulation development.
Technical Assessment of the Affymetrix Yeast Expression GeneChip YE6100 Platform in a Heterologous Model of Genes That Confer Resistance to Antimalarial Drugs in Yeast

ABSTRACT The advent of high-density gene array technology has revolutionized approaches to drug design, development, and characterization. At the laboratory level, the efficient, consistent, and dependable exploitation of this complex technology requires the stringent standardization of protocols and data analysis platforms. The Affymetrix YE6100 expression GeneChip platform was evaluated for its performance in the analysis of both global (6,000 yeast genes) and targeted (three pleiotropic multidrug resistance genes of the ATP binding cassette transporter family) gene expression in a heterologous yeast model system in the presence and absence of the antimalarial drug chloroquine. Critical to the generation of consistent data from this platform are issues involving the preparation of the specimen, use of appropriate controls, accurate assessment of experiment variance, strict adherence to optimized enzymatic and hybridization protocols, and use of sophisticated bioinformatics tools for data analysis.
A semiotic model of visual perception

Abstract In this study, we construct a general semiotic model representing the physiological and mental processes involved in visual perception. The model has the form of an ordered typology of perceptual processes, where the ordering is determined by the Peircean categories of thought. This method of semiotic modeling is then applied to the specific mental processes involved in the perception of camouflage and visual illusions. The typology of visual illusions includes a unified explanation for the perception of static visual illusions that is based on semiotic principles.
High-Speed Rail: lessons for policy makers from experiences abroad

In April 2009 the US government unveiled its blueprint for a national network of high-speed passenger rail (HSR) lines aimed at reducing traffic congestion, cutting national dependence on foreign oil and improving rural and urban environments. In implementing such a program, it is essential to identify the factors that might influence decision making and the eventual success of the HSR project, as well as foreseeing the obstacles that will have to be overcome. In this article we review, summarize and analyze the most important HSR projects carried out to date around the globe, namely those of Japan, France, Germany, Spain, and Italy. We focus our attention on the main issues involved in the undertaking of HSR projects: their impact on mobility, the environment, the economy and on urban centers. By so doing, we identify sessons for policy makers and managers working on the implementation of HSR projects.
Conception et réalisation d'un système d'aide à la gestion des tensions dans les services d'urgences pédiatriques : vers des nouvelles approches d'évaluation, de quantification et d'anticipation

La Tension dans un Service d’Urgences (SU) est un desequilibre entre le flux de charge des soins et la capacite de prise en charge sur une duree suffisante pouvant entrainer des consequences nefastes au bon fonctionnement. Elle se reflete par la surcharge des locaux, l’allongement des delais de traitement et d’attente. Ce qui provoque a la fois l’insatisfaction des patients et l’anxiete du personnel. Cette these s’inscrit dans le cadre du projet HOST finance par le programme ANR-TECSAN-2011 afin d’elaborer un Systeme d'Aide a la Gestion de la Tension (SAGeT) assurant trois objectifs:1. L’evaluation multicritere grâce a une panoplie d’indicateurs agreges par la logique floue afin de resoudre la subjectivite du ressentie humain de la tension. Chaque scenario d’evaluation declenche des regles de decision specifiques ciblant ainsi des points de defaillance a surveiller.2. L’anticipation de la demande sur differents horizons temporels : l’application des methodes SARIMA et SARIMAX est justifiee par la saisonnalite des chroniques de visites et l’influence de certains parametres externes (epidemies, vacances, meteo). De plus, la qualite de l’information venant de l’historique a ete amelioree par une recomposition d’historique basee sur la vraisemblance journaliere.3. L’amelioration de la gestion des flux et le pilotage de l’activite puisque l’utilisation de SAGeT comme un tableau de bord offre une vue macro sur l’ensemble de l’activite (lits occupes, patients en attente, durees de passages previsionnelles et allongements excessifs). Les simulations traitent des vrais scenarios de tension observes entre 2011 et 2013 dans le SU Pediatriques Jeanne de Flandre du CHRU-Lille.
Data clustering for circle detection

This paper considers multiple-circle detection problem on the basis of given data. The problem is being solved by application of center-based clustering method. For the purpose of searching a locally optimal partition, modeled on a well-known k-means algorithm, k-closest circles algorithm has been constructed. The method has been illustrated with several numerical examples. Key words: data clustering, circle detection, k -means, locally optimal partition
Descrição de texturas invariante a rotação e escala para identificação e reconhecimento de imagens

Uma importante caracteristica de baixo nivel, utilizada tanto na percepcao humana como no reconhecimento de padroes, e a textura. De fato, o estudo de textura tem encontrado diversas aplicacoes abrangendo desde segmentacao de textura ate sintese, classificacao e recuperacao de imagens por conteudo.Apesar das multiplas tecnicas eficientes e eficazes propostas para classificacao e recuperacao, ainda ha alguns desafios que precisam ser superados como, por exemplo, a necessidade de descritores de imagens compactos e robustos a serem empregados na consulta e classificacao de bases de imagens de textura. Esta dissertacao propoe um descritor de imagens de textura visando a busca e a recuperacao de bases de dados de imagens. Este descritor baseia-se na Decomposicao Piramidal Steerable caracterizada por sua analise de forma invariante a rotacao ou a escala. Resultados preliminares conduzidos em cenarios nao-controlados demonstraram carater promissor da abordagem. No que diz respeito a classificacao de imagens de textura, esta dissertacao propoe ao mesmo tempo um sistema de reconhecimento, o qual possui como principais caracteristicas representacoes compactas de imagens e modulos de reconhecimento eficientes. O descritor proposto e utilizado para codificar a informacao relevante de textura em vetores de caracteristicas pequenos. Para tratar os requisitos de eficiencia do reconhecimento, uma abordagem multi-classe baseada no classificador de Floresta de Caminhos Otimos e utilizada. Experimentos foram condl! zidos visando avaliar o sistema proposto frente a outros metodos de classificacao. Resultados experimentais demonstram a superioridade do sistema proposto Abstract
Contributions à la diffusion dans les réseaux ad hoc

Les technologies sans fils ont atteint une place dominante ces demieres annees. Le fait de laisser a l'utilisateur une totale liberte de mouvement et des debits grandissants ont popularise ce moyen de communication. Pourtant, cette liberte est loin d'etre, car eIle est reliee a un point fixe de coordination des communications (une borne d'acces fixe dans le cas du systeme Wifi ou du GSM). Les reseaux ad hoc proposent une vision sans infrastructure, ou le reseau est supporte par l'ensemble des utilisateurs mobiles. Dans un tel systeme, chaque mobile peut relayer un message de ses voisins, dans le but de pennettre a chacun des noeuds de pouvoir joindre n'importe qui d'autre dans le reseau, a condition qu'il existe des noeuds sur le chemin pouvant relayer le message. L'operation de diffusion (ou brodcast) est une operation courante dans de tels reseaux. Elle consiste a envoyer un message a l'ensemble des mobiles participants au reseau ad hoc. A cause de la mobilite, des possibilites de collision radio, de la connaissance limitee du voisinage et de la nature distribuee des algorithmes utilises dans chaque noeud, cette operation peut se reveler couteuse si elle est effectuee de maniere naive. Dans la premiere partie du travail de recherche expose, l'objectif est de reduire le nombre de messages emis par l'ensemble du reseau, de maniere a reduire les risques de collisions tout en assurant une couverture complete. Le protocole BRP est un algorithme probabiliste dont la decision de reemission est biaisee par l'etude du voisinage commun entre deux noeuds. Le protocole RRS utilise l'algorithme de reduction de graphe pour reduire le voisinage de chaque noeud et ainsi permettre une prise de decision a partir d'un nombre limite de voisins. Dans la deuxieme partie, l'etude est portee sur la reduction du cout energetique, qui depend en grande partie des communications radios. Avec des antennes omnidirectionnelles, chaque mobile peut reduire sa portee. RBOP et LBOP tirent avantage de ce procede en utilisant les algorithmes de reduction de graphe RNG et LMST afin de reduire la consommation tout en gardant un reseau connexe. Le cas des antennes directionnelles est egalement envisage, avec la proposition d'un algorithme hybride ADLBOP utilisant une communication un-vers-un ou un-vers-tous en fonction du modele energetique affecte au cout de la transmission et de la topologie locale.
Mercury Contamination in Forest and Freshwater Ecosystems in the Northeastern United States

ABSTRACT Eastern North America receives elevated atmospheric mercury deposition from a combination of local, regional, and global sources. Anthropogenic emissions originate largely from electric utilities, incinerators, and industrial processes. The mercury species in these emissions have variable atmospheric residence times, which influence their atmospheric transport and deposition patterns. Forested regions with a prevalence of wetlands and of unproductive surface waters promote high concentrations of mercury in freshwater biota and thus are particularly sensitive to mercury deposition. Through fish consumption, humans and wildlife are exposed to methylmercury, which markedly bioaccumulates up the freshwater food chain. Average mercury concentrations in yellow perch fillets exceed the Environmental Protection Agency's human health criterion across the region, and mercury concentrations are high enough in piscivorous wildlife to cause adverse behavioral, physiological, and reproductive effects. Initiatives are under way to decrease mercury emissions from electric utilities in the United States by roughly 70%.