gebhart/patrepeval huggingface dataset:
Teixint vincles des de la formació fins a la professió: El paper del capital social dels futurs mestres i dels mestres novells en el seu desenvolupament professional a través de l'anàlisi de xarxes socials (2019)

Tomando como base la teoria del capital social, podemos considerar que los individuos forman parte de una estructura social que les permite acceder a diferentes recursos a partir de las relaciones que se generan. En educacion, estudios recientes demuestran la importancia de atender esta vertiente social, con el acento puesto en el capital social como elemento clave en la mejora de la praxis educativa. Debido a su importancia en el entramado educativo, esta mirada se ha dirigido hacia la figura de los maestros y su desarrollo profesional. No obstante, todavia son escasos los estudios que encontramos en la literatura sobre el capital social y los maestros, especialmente en la formacion inicial en la universidad y en la posterior incorporacion en las escuelas. Poniendo de manifiesto este vacio incipiente, la presente tesis doctoral nace con el objetivo principal de explorar cual es la relacion entre el capital social de los futuros maestros y de los maestros noveles con su desarrollo profesional. Concretamente, la tesis se estructura mediante la presentacion de un compendio de tres articulos cientificos con tal de dar respuesta a los interrogantes de la investigacion. Para conseguirlo, nos centramos en el objeto de estudio del capital social de los maestros como concepto multidimensional y en su aproximacion a partir de la teoria y analisis de redes sociales. Los resultados confirman la relacion entre un mayor capital social y la mejora del desarrollo profesional. A su vez, apuntan hacia la importancia de entender las estructuras sociales en los contextos educativos de la universidad y la escuela, mediante la exploracion de diferentes aspectos tal y como las posiciones y las conexiones, la frecuencia de las interacciones, la naturaleza de los recursos, las relaciones formales e informales, el rol de la confianza, o los valores y los objetivos compartidos dentro de las redes. Finalmente, sugerimos los elementos a tener en cuenta en los diferentes programas y reformas educativas para fomentar el capital social: mayor vinculacion de los maestros, promocion de climas colaborativos, incremento de la confianza, fomento de vinculos con la comunidad y aplicacion de acciones de acogida y mentoraje.
Lessons from giant-scale services (2001)

Web portals and ISPs such as AOL, Microsoft Network, and Yahoo have grown more than tenfold in the past five years (1996-2001). Despite their scale, growth rates, and rapid evolution of content and features, these sites and other "giant-scale" services like instant messaging and Napster must be always available. Many other major Web sites such as eBay, CNN, and Wal-Mart, have similar availability requirements. The article looks at the basic model for such services, focusing on the key real-world challenges they face (high availability, evolution, and growth), and developing some principles for attacking these problems. Few of the points made in the article are addressed in the literature, and most of the conclusions take the form of principles and approaches rather than absolute quantitative evaluations. This is due partly to the author's focus on high-level design, partly to the newness of the area, and partly to the proprietary nature of some of the information (which represents 15-20 very large sites). Nonetheless, the lessons are easy to understand and apply, and they simplify the design of large systems.
Comparison of Non‐Parabolic Hydrodynamic ModelsBased On Different Band Structure Models (1998)

This paper presents two non‐parabolic hydrodynamic model formulations suitable for the simulation of inhomogeneous semiconductor devices. The first formulation uses the Kane dispersion relationship, (ℏk) 2 /2m = W(1+αW). The second formulation makes use of a power law, (ℏk) 2 /2m = xW y , for the dispersion relation. The non‐parabolicity and energy range of the hydrodynamic model based on the Kane dispersion relation is limited. The power law formulation produces closed form coefficients similar to those under the parabolic band approximation but the carrier concentration can deviate. An extended power law dispersion relation is proposed to account for band structure effects, (ℏk) 2 /2m = xW 1+yW . This dispersion relation closely matches the calculated band structure over a wide energy range and may lead to closed form coefficients for the hydrodynamic model.
Flux modulated coherent radiation from arrays of Josephson microbridges coupled by superconducting loops (1979)

We have studied the phase locking of two and eight microbridge arrays shunted by superconducting loops in a dc SQUID configuration. The difference in phase between adjacent bridges is controlled by the applied flux, and thus the radiated power is a periodic function of this flux. With adjustment of the external flux, the individual bridge voltages can be made to add in phase. The effect of additional normal shunts on the phase locking is also investigated.
PKI: Implementing and Managing E-Security (2001)

From the Publisher:
Written by the experts at RSA Security,this book will show you how to secure transactions and develop customer trust in e-commerce through the use of PKI technology. Part of the RSA Press Series. 
Implement PKI technology and enable secure Web transactions Conduct online business safely by following the implementation techniques found inside this essential guide to PKI technology. Written by the experts at RSA security,this book provides comprehensive coverage of this emerging technology that uses digital certificates to secure Internet transactions. Beginning with an introduction to cryptography,this book explains the technology that creates a public-key infrastructure,and outlines the necessary steps for implementing PKI in both business-to-business and business-to-consumer environments. Also included is material on WAP,authorization systems,and cost of ownership,making this the most in-depth reference on PKI available. 


This book will show you how to:Understand basic principles of cryptographic systemsLearn how a public key infrastructure supplies security services for electronic commerce deploymentsGet details on applicable standards ITU-X. 500,IETF-PKIX,and WAPApply certificates for authentication,time stamping,and non-repudiationManage key and certificate life cycles within a public key infrastructureManage the PKIX architecture and the PKI protocols that allow interoperability between different vendor implementationsUnderstand how trust models can be used to establish relationships between organizations


Follow case studies to solve common problems encountered when implementing PKI
Series2Graph (2020)

Subsequence anomaly detection in long sequences is an important problem with applications in a wide range of domains. However, the approaches that have been proposed so far in the literature have severe limitations: they either require prior domain knowledge that is used to design the anomaly discovery algorithms, or become cumbersome and expensive to use in situations with recurrent anomalies of the same type. In this work, we address these problems, and propose an unsupervised method suitable for domain agnostic subsequence anomaly detection. Our method, Series2Graph, is based on a graph representation of a novel low-dimensionality embedding of subsequences. Series2Graph needs neither labeled instances (like supervised techniques), nor anomaly-free data (like zero-positive learning techniques), and identifies anomalies of varying lengths. The experimental results, on the largest set of synthetic and real datasets used to date, demonstrate that the proposed approach correctly identifies single and recurrent anomalies without any prior knowledge of their characteristics, outperforming by a large margin several competing approaches in accuracy, while being up to orders of magnitude faster.
Induction of Kidney Epithelial Morphogenesis by Cells Expressing Wnt-1 (1994)

During kidney development, unknown signals derived from the ureteric bud induce metanephric mesenchymal cells to differentiate into nephron epithelia. In addition to the ureteric bud, a number of other tissues can act as heterologous inducers of this process in vitro, including embryonic spinal cord. In this report we demonstrate that Wnt-1, a gene that encodes a secreted glycoprotein expressed in embryonic spinal cord, is capable of conferring nephron-inducing activity to fibroblast cell lines. When cocultured with cells expressing exogenous Wnt-1, metanephric mesenchyme differentiated into glomerular and renal tubular epithelia. No such effect was observed using control cells. These data imply that the ability of embryonic spinal cord to act as an inducer of nephrogenesis may result from its production of Wnt-1 protein and suggest that a member of the Wnt gene family may be a mediator of renal epithelial morphogenesis in vivo.
Efficient Priority Access to the Shared Commercial Radio with Offloading for Public Safety in LTE Heterogeneous Networks (2014)

This paper presents the algorithm Courteous Priority Access to the shared commercial radio with offloading (CPAwO), for public safety network (PSN) over LTE heterogeneous networks (HetNets). We propose a solution for prioritization of PSN users with access to the commercial radio network resources. Our model offers additional radio resources to the PSN. Furthermore, it ensures a certain priority for commercial users by assigning quantities of additional radio resources through the courteous scheme. This allows delaying preemption and blocking bearers when the radio resources are limited. The other part of CPAwO model is to apply the principle of offloading in order to reduce the impact of the macrocell congestion. This technique is to switch the new bearers arriving at the LTE macrocells to small cells, in order to decrease the number of the blocked and interrupted bearers in the network. The results of the simulation showed that the allocation of radio resources via the courteous mechanism with offloading of new bearers to small cells reduces the rate of blocking bearers and delays the preemption of active bearers present in the LTE HetNets. It also reduces the cost of the end-to-end communications, thanks to the reallocation of free frequencies.
Extending Croquet Spaces with Vector Fields, Vehicles, and Virtual Presence (2006)

The Croquet system is a toolkit for constructing collaborative multi-user virtual environments incorporating time-synchronization and advanced 3D visualization and simulations. To investigate how a Croquet environment might be used in education to explore physical phenomenon, we are developing metaphors for visualizing and making audible space-varying forces (vector fields). These vector fields can interact with objects, and this allows us to construct simulations of systems such as charged particles in fields or sailboats interacting with wind. A natural extension of the vector field/object interaction is to allow for objects that act as vehicles so that users may ride them. By providing a vehicle capability to objects, we have both an intuitive metaphor for changing the user's spatial navigational interfaces, and allow users to experience the path of an object through a field. This vehicle metaphor also points toward an interface for guided tours of spaces. Guided tours imply voice and text chat to enable user discussion and collaboration. Not everyone is present in a given Croquet space at all times - this motivates our work to provide bridges between the Croquet in-world experience and legacy text-chat/voice communications systems. These legacy chat systems can also provide information about who is currently present and active in a given Croquet space to those outside the space and so help address user-rendezvous problems. While chat is important, if Croquet is seen as nothing more than chat in the form of a 3D avatar fancy-dress party, we will not achieve our goals of transforming educational content via multi-user simulations and advanced visualization. It is the synergies inherent in combining virtual presence, vehicles, vector fields that allows for rich collaborative construction and exploration of spaces and physical simulations (such as charged particles in fields or sailboats) with user-led guided tours of these spaces
Selection of Oxygen Carriers for Chemical-Looping Combustion (2004)

Chemical-looping combustion (CLC) has been suggested as an energetically efficient method for capture of carbon dioxide from the combustion of fuel gas. This technique involves the use of an oxygen carrier that transfers oxygen from the air to the fuel, preventing direct contact between them. The oxygen carrier is composed of a metal oxide as an oxygen source, and an inert as a binder for increasing the mechanical strength of the carrier. In this work, 240 samples composed of 40−80% of Cu, Fe, Mn, or Ni oxides on Al2O3, sepiolite, SiO2, TiO2, or ZrO2 were prepared by mechanical mixing as cylindrical extrudates. The samples were sintered at four temperatures between 950 and 1300 °C. The effects of the chemical nature and composition of the carrier and the sintering temperature were investigated by reactivity tests in a thermogravimetric analyzer using CH4 as fuel, and the mechanical strength of the solids. On the basis of these properties, the most promising carriers to be used in a CLC system were selected. The best Cu-based oxygen carriers were those prepared using SiO2 or TiO2 as inert, and sintered at 950 °C. Among the Fe-based oxygen carriers, those prepared with Al2O3 and ZrO2 as inerts showed the best behavior. ZrO2 was the best inert for those Mn-based oxygen carriers. Finally, TiO2 was the best inert for those Ni-based oxygen carriers.
Phosphatidylinositol cleavage in lymphocytes. Requirement for calcium ions at a low concentration and effects of other cations (1974)

The soluble activity in lymphocytes which converts phosphatidylinositol into 1,2-diacylglycerol and inositol phosphates requires Ca(2+) ions. At pH7 maximum activity occurs at [Ca(2+)](free) approximately 0.7mum whereas at pH5.5 the equivalent value is approx. 50mum. At [Ca(2+)](free) approximately 1mum, a concentration similar to common intracellular values, essentially all activity is confined to the peak of activity at pH7.0. Previous reports of requirements for larger amounts of Ca(2+) may reflect the fact that the Ca(2+)-buffering capacity of phosphatidylinositol means that high substrate concentrations can effectively decrease [Ca(2+)](free). Cations which displace Ca(2+) from association with phosphatidylinositol can, at low [Ca(2+)](free), enhance enzyme activity. Phosphatidylinositol breakdown in intact cells might be controlled, at least in part, by changes in intracellular [Ca(2+)](free).
Synthesis of Soluble Poly(arylene ether sulfone) Ionomers with Pendant Quaternary Ammonium Groups for Anion Exchange Membranes (2009)

A new bisphenol monomer, 2,2′-dimethylaminemethylene-4,4′-biphenol (DABP), was easily prepared by Mannich reaction of dimethylamine and formaldehyde with 4,4′-biphenol. Novel partially fluorinated poly(arylene ether sulfone)s with pendant quaternary ammonium groups were prepared by copolymerization of DABP, 4,4′-biphenol, and 3,3′,4,4′-tetrafluorodiphenylsulfone, followed by reaction with iodomethane. The resulting copolymers PSQNI-x (where x represents the molar fraction of DABP in the feed) with high molecular weight exhibited outstanding solubility in polar aprotic solvents; thus, the flexible and tough membranes of PSQNI-x with varying ionic content could be prepared by casting from the DMAc solution. Novel anion exchange membranes, PSQNOH-x, were obtained by an anion exchange of PSQNI-x with 1 N NaOH. All PSQNOH-x membranes showed conductivities above 10−2 S cm−1 at room temperature, for example, the hydroxide conductivity of PSQNOH-90 achieved to 8.4 × 10−2 S cm−1, which was thus comparable to the proton conductivity of Nafion 117 (i.e., 9.0 × 10−2 S cm−1).
Soft Sensor Suits as Man-Machine Interface for Wearable Power Amplifier (2006)

The authors have developed innovative soft sensor suits embedded with electromyogram (EMG) and a variety of sensors for measuring human muscle activities. The sensor suits serve as a man-machine interface for human power amplification. This paper focuses on the EMG part of the sensor suits to study the fundamental issue of torque estimation based on the sensor readings. An innovative auto-calibration system is developed in this study based on multi-regression analysis and neural networks, where an universal database, rather than individual database for each operator, is proposed and as a result, the calibration time is dramatically decreased. The calibration system can also compensate for sensor positioning errors. In the end, the sensor suits are applied as a man-machine interface for a soft power amplifier composed of artificial muscles. The artificial muscles are successfully controlled using the torque information estimated by the EMG sensor suits. The relation between torque estimation errors on sensor suits and maneuverability of power amplifier is experimentally verified.
Studies on Herbal Aphrodisiacs Used in Arab System of Medicine (1989)

Toxicity studies were conducted on Brassica rapa, Prunus amygdalus and Zingiber officinale, used as aphrodisiacs in Arab Medicine. During acute toxicity test observations were made for 24 h where all these plants showed no toxicity. The animals were treated for 3 months in chronic treatment. External morphological changes, visceral toxicity, haematological changes, effects on average body weight, vital organ weight, sperm contents, sperm motility and sperm abnormalities were recorded. The average body weight increase was significant in B. rapa and P. amygdalus treated animals. Haematological studies revealed reduction in WBC level in these groups. These changes were not significant in Z. officinale treated animals. In all three groups the visceral condition was normal and the percent lethality was insignificant as compared to the control. All these plant extracts significantly increased the sperm motility and sperm contents in the epididymides and vas deferens without producing any spermatotoxic effect.
Remote sensing of water temperature using Raman spectroscopy (2016)

The measurement of water temperature, both at and below the surface in bodies of water, is of great importance for research fields including climate change, marine biology, hydrologic modelling and marine engineering. While sea surface temperature can be obtained with passive satellite sensing, sub–surface measurements are limited to suspended arrays of detectors, expendable probes and autonomous vehicles. None of these methods are compatible with rapid systematic mapping of sub–surface water temperature. The aim of the research presented in this thesis is to develop methods for rapid, depth–resolved remote sensing of water temperature using Raman spectroscopy, and to explore the potential to incorporate measurement of salinity. An optical, depth–resolved temperature sensing solution would provide a capability for rapid, three–dimensional sub–surface measurement (tens of metres) within bodies of water from airborne, surface or sub–surface platforms. Raman scattered light from vibrational transitions of water have temperature dependent properties which may be exploited for temperature determination. In order to achieve these goals, a detailed laboratory study of the polarisedand unpolarised Raman spectra of water was conducted. This identified spectral features and measurement parameters which gave the greatest temperature determination accuracy. Multiple linear regression was employed to combine these parameters in models for determination of water temperature. An assessment was made of the temperature accuracy which might be expected for practical sensing using these parameters. Raman spectra of samples from natural water sources were analysed to assess the effect of water constitution on temperature determination accuracy and the application of baseline correction to improve this. The effect of changing both temperature and salinity on Raman spectra was examined using multivariate analysis, and the potential measurement accuracy of both quantities was determined. Configurations for simple multi–channel sensing instruments were designed based on the Raman temperature and salinity determination methods investigated, and these will be evaluated in future field studies.
Evolution and Functional Diversification of <i>MIRNA</i> Genes (2011)

MicroRNAs (miRNAs) are small regulatory RNAs found in diverse eukaryotic lineages. In plants, a minority of annotated MIRNA gene families are conserved between plant families, while the majority are family- or species-specific, suggesting that most known MIRNA genes arose relatively recently in evolutionary time. Given the high proportion of young MIRNA genes in plant species, new MIRNA families are likely spawned and then lost frequently. Unlike highly conserved, ancient miRNAs, young miRNAs are often weakly expressed, processed imprecisely, lack targets, and display patterns of neutral variation, suggesting that young MIRNA loci tend to evolve neutrally. Genome-wide analyses from several plant species have revealed that variation in miRNA foldback expression, structure, processing efficiency, and miRNA size have resulted in the unique functionality of MIRNA loci and resulting miRNAs. Additionally, some miRNAs have evolved specific properties and functions that regulate other transcriptional or posttranscriptional silencing pathways. The evolution of miRNA processing and functional diversity underscores the dynamic nature of miRNA-based regulation in complex regulatory networks.
New cyclodepsipeptides, enniatins D, E and F produced by Fusarium sp. FO-1305. (1992)

New cyclodepsipeptides named enniatins D, E and F were isolated from the culture broth of Fusarium sp. FO-1305 as inhibitors of acyl-CoA:cholesterol acyltransferase (ACAT). The respective structures of enniatins D, E and F were determined to be cyclo[D-alpha-hydroxyisovaleryl(D-Hiv)-L-N-methylleucinyl(L- Me-Leu)-D-Hiv-L-N-methylvalinyl(L-Me-Val)-D-Hiv-L-Me-Val], a mixture of cyclo-[D-Hiv-L-Me-Leu-D-Hiv-L-N-methylisoleucinyl(L-Me-Ile)-D-Hiv- L-Me-Val] and cyclo(D-Hiv-L-Me-Ile-D-Hiv-L-Me-Leu-D-Hiv-L-Me-Val), and cyclo(D-Hiv-L-Me-Leu-D-Hiv-L-Me-Ile-D-Hiv-L-Me-Ile) by spectral analyses and chemical degradation. The IC50 values of enniatins D, E and F for ACAT activity in an enzyme assay using rat liver microsomes were calculated to be 87, 57 and 40 microM, respectively.