Estudo das tecnologias de interatividade no processo de compra em contexto das lojas de vestuário on-line

Dissertação de mestrado em Design de Comunicação de Moda

Concise server-wide causality management for eventually consistent data stores

Large scale distributed data stores rely on optimistic replication to scale and remain highly available in the face of net work partitions. Managing data without coordination results in eventually consistent data stores that allow for concurrent data updates. These systems often use anti-entropy mechanisms (like Merkle Trees) to detect and repair divergent data versions across nodes. However, in practice hash-based data structures are too expensive for large amounts of data and create too many false conflicts. Another aspect of eventual consistency is detecting write conflicts. Logical clocks are often used to track data causality, necessary to detect causally concurrent writes on the same key. However, there is a nonnegligible metadata overhead per key, which also keeps growing with time, proportional with the node churn rate. Another challenge is deleting keys while respecting causality: while the values can be deleted, perkey metadata cannot be permanently removed without coordination. Weintroduceanewcausalitymanagementframeworkforeventuallyconsistentdatastores,thatleveragesnodelogicalclocks(BitmappedVersion Vectors) and a new key logical clock (Dotted Causal Container) to provides advantages on multiple fronts: 1) a new efficient and lightweight anti-entropy mechanism; 2) greatly reduced per-key causality metadata size; 3) accurate key deletes without permanent metadata.

Analysis of the effects of the continuous electrode paste band on precordial leads of the electrocardiogram

OBJECTIVE - To determine if the application of a continuous electrode paste band on precordial leads results in alteration of the electrocardiographic tracing as compared with an adequate amount of electrode paste, and if the former condition does not cause uniform morphologies from V1 to V6. METHODS - The amplitude and morphology of the electrocardiographic waves on the precordial leads in electrocardiographic tracings, which were performed with standard (control group) or excessive (continuous band) application of the electrode paste, were compared. RESULTS - None of the 106 patients studied showed uniformity of the QRS morphology from V1 to V6. The eletrocardiographic alterations identified in the tracings performed with a continuous electrode paste band that showed statistical significance in relation to the control group were the following: inversion of the P wave in V1; inversion of the T wave in V1, V2, and V3; appearance of R' waves in V1 and V2; disappearance of S waves in V1; appearance of S waves in V5 and V6; alterations in the amplitude of almost all waves, in all leads. CONCLUSION - Application of a continuous electrode paste band in the precordial leads may cause significant alterations in the electrocardiographic tracing obtained.

Síntesis y Caracterización de Materiales Nanoestructurados para el Almacenamiento de Hidrógeno. Hidrogen storage: Synthesis and characterization of nanostructured materials.

El hidrógeno tiene, actualmente, una atención considerable por su posible uso como combustible limpio y otros usos industriales y se ha demostrado que es posible hacer funcionar motores de combustión interna, por lo tanto es una alternativa viable respecto de fuentes de energía no renovables como el petróleo y tal vez sea en el futuro la tecnología más prometedora para reducir la contaminación, conservando el suministro de combustibles fósiles. Uno de los principales problemas para la utilización del hidrógeno como combustible es el del almacenamiento para que pueda ser seguro y transportable con todos los riesgos que esto supone. En este sentido el estudio de la adsorción de polímeros conductores (tal como polianilina, PANI o polipirrol PPy) y su posterior polimerización sobre hospedajes como aluminosilicatos meso y microporosos y carbones mesoporosos, es de suma importancia por sus propiedades para el almacenamiento de H2. El objetivo general de este proyecto es Investigar el almacenamiento de hidrógeno en nuevos composites nano/microestructurados. La síntesis de materiales micro/mesoporosos (MFI, MEL, BEA, L, MS41, SBA-15, SBA-1, SBA-3, SBA-16, CMK-3) para usos como hospedaje se realizan por sol-gel o síntesis hidrotérmica y se modificarán con TiO2, CeO2, ZrO2 y eventualmente con Ir, Ni, Zr. Muestras de estos hospedajes serán expuestos a vapores del monómero puro (anilina o pirrol). Luego se polimerizarán por polimerización oxidativa. Los nanocomposites sintetizados se caracterizarán por XRD, FTIR, DSC, TGA, SEM, TEM, EXFAS, XANES, UV-Vis. La adsorción de hidrógeno sobre los composites se llevará a cabo en un Reactor Parr, desde presiones atmosféricas y a altas presiones y varias temperaturas de adsorción . Los estudios de desorción de hidrogeno se llevarán a cabo en un equipo Chemisorb Micrometrics y se realizarán estudios termogravimétricos y de capacidad de retención de Hidrogeno por el nanocomposite. La importancia del estudio de este proceso tiene importantes implicancias económicas y sociales que serán preponderantes en el futuro debido a las cada vez más exigentes regulaciones ambientales. Además se contribuirá al avance del conocimiento científico, ya que es posible diseñar nuevos materiales, los que además permitirán generar reservorios de H2 con alta eficiencia. Por lo consiguiente: - Se desarrollarán nuevos materiales nanoestructurados, micro y mesoporosos y nanoclusters de especies activas en los hospedajes como así también la inclusión de polímeros (PANI, PPy) dentro de los canales de estos materiales. - Se caracterizarán estos materiales por métodos espectroscópicos (fisicoquímica de superficie). - Se estudiará la adsorción /absorcion de H2 en los nuevos materiales desarrollados. -Se aplicarán métodos de diseño de experimento (RDS), para optimizar el proceso de almacenamiento de H2, nivel de interacción de variables sinérgicas o colinérgicas.

Nordisches Plankton : botanischer teil, band 8, [hrsg. von K. Brandt und C. Apstein, unter Mitwirkung von Bergendal ... et al.].

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Nordisches Plankton : botanischer teil, band 8, [hrsg. von K. Brandt und C. Apstein, unter Mitwirkung von Bergendal ... et al.].

Bd.8,hft.18

Nordisches Plankton : botanischer teil, band 8, [hrsg. von K. Brandt und C. Apstein, unter Mitwirkung von Bergendal ... et al.].

Bd.8,hft.13

Nordisches Plankton : botanischer teil, band 8, [hrsg. von K. Brandt und C. Apstein, unter Mitwirkung von Bergendal ... et al.].

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Interaction of the brain-specific Arf-GAP protein p42 I P 4 (centaurin α1, ADAP1) with the metalloendopeptidase nardilysin and modulation by tubulin

Magdeburg, Univ., Fak. für Naturwiss., Diss., 2012

Interactions of bottom-up and top-down processes in human evoked gamma-band activity

Gamma-band activity, EEG, top-down, bottom-up

Behavioural and cognitive relevance of evoked gamma-band responses in ADHD patients and healthy children

Magdeburg, Univ., Fak. für Natuwiss., Diss., 2009

Effekte einer transienten, früh postnatalen Hyperthyreose auf Verhalten und die Expression der Neurotrophine der NGF-Familie im medialen System und Broca Band der Ratte

Magdeburg, Univ., Medizin. Fak., Diss., 2004

AvBandTest – a Testing Tool for Implementations of Available Band width Estimation Algorithms

This work describes a test tool that allows to make performance tests of different end-to-end available bandwidth estimation algorithms along with their different implementations. The goal of such tests is to find the best-performing algorithm and its implementation and use it in congestion control mechanism for high-performance reliable transport protocols. The main idea of this paper is to describe the options which provide available bandwidth estimation mechanism for highspeed data transport protocols and to develop basic functionality of such test tool with which it will be possible to manage entities of test application on all involved testing hosts, aided by some middleware.

Parallel Architecture Prototype for 60 GHz High Data Rate Wireless Single Carrier Receiver

Nowadays a huge attention of the academia and research teams is attracted to the potential of the usage of the 60 GHz frequency band in the wireless communications. The use of the 60GHz frequency band offers great possibilities for wide variety of applications that are yet to be implemented. These applications also imply huge implementation challenges. Such example is building a high data rate transceiver which at the same time would have very low power consumption. In this paper we present a prototype of Single Carrier -SC transceiver system, illustrating a brief overview of the baseband design, emphasizing the most important decisions that need to be done. A brief overview of the possible approaches when implementing the equalizer, as the most complex module in the SC transceiver, is also presented. The main focus of this paper is to suggest a parallel architecture for the receiver in a Single Carrier communication system. This would provide higher data rates that the communication system canachieve, for a price of higher power consumption. The suggested architecture of such receiver is illustrated in this paper,giving the results of its implementation in comparison with its corresponding serial implementation.

"Eczema in psoriatico" : closing the gap between palmoplantar psoriasis and palmoplantar chronic contact dermatitis : a clinical, histological and immunohistological study

Magdeburg, Univ., Med. Fak., Diss., 2014