Image Processing for Atrial Fibrillation Ablation Procedures ab 89.9 € als Taschenbuch: Image Processing for Fluoroscopy Guided Atrial Fibrillation Ablation Procedures. Aus dem Bereich: Bücher, English, International, Gebundene Ausgaben,
Image Processing for Atrial Fibrillation Ablation Procedures ab 89.9 EURO Image Processing for Fluoroscopy Guided Atrial Fibrillation Ablation Procedures
This dissertation, through a systematic investigation of the behavior of the gas-phase dynamics ofnanoparticles generated by laser ablation of solid target materials in background gasesand a study of the physical processes involved in gas-phase nanoparticle processing, explores the combination of laser and aerosol processes as a novel approach to make thinfilm materials with a level of microscopic organization similar to that found in nature.The integrated laser-aerosol method is very flexible and can be used in thesynthesis of a variety of materials. In this study it is applied to the deposition ofnanocomposite thin films comprising tetrahedral amorphous carbon (ta-C) withembedded metal nanoparticles. The controlled incorporation of metal nanoparticlesenables the modulation of the electrical conductivity of ta-C over four orders ofmagnitude without significantly or adversely affecting its mechanical properties.
This book is an expression of the myriad ways in which the range of Remote Sensing and GIS techniques can be applied to the mapping of glaciers. Glaciers are characterized by the variability of different types of snow and ice deposited in accumulation and ablation areas. Remote Sensing techniques like Digital image processing of satellite data provide an effective solution for categorizing the various materials on glaciers depending upon their spectral reflectance.Visual interpretation in glaciated terrain suffers mainly because of less understanding highly variable material composition and processes operative over glaciers. This sometimes leads to biased interpretation based on little knowledge which leads to wrong interpretation. Inventory of the glaciers is of prime interest to evaluate the nature of changes in glacier dimensions and also to establish relationship between climatic change and dynamics of glaciers. As glaciological studies in high altitude terrains are very difficult by conventional methods. Remote Sensing data with GIS techniques is used to mapping and monitoring of permanent snowfields and glacier covered area.
We analyze in this work the recombination at local aluminum alloyed contacts, which are realized by local laser ablation of a dielectric stack and subsequent full area screen printing of aluminum paste. The contact formation occuring during a final rapid thermal anneal is quantitatively described for the first time. We focus in this work to analyze the processing parameters of local aluminum alloyed contacts to enable lowest contact recombination in solar cells.
Ultrafast lasers have been widely employed for material micro/nano processing with little thermal damage. Due to the ultra high intensity of ultrashort pulses, nonlinear absorption can be induced at the focus leading to highly localised material ablation or modification. This is now opening up applications ranging from integrated optics, through multi-photon induced refractive index engineering to precision surface micro-structuring. To ensure the non-thermal processing, input pulse energy must be kept around micro-joule level. However, running at kilohertz repetition rate, many ultrafast laser systems can provide milli-joule level output. Therefore, significant energy attenuation causes a great deal of energy loss. With this limitation in mind, a multi-beam ultrafast laser processing, where the milli-joule output is split into many desired diffracted beams, is proposed in this book. The multi-beam patterns are generated by phase modulation through a Spatial Light Modulator (SLM) and can be applied in real time with synchronized scanning methods. The results demonstrate high precision parallel ultrafast laser micro/nano fabrication with greatly increased efficiency and throughput.
Atrial fibrillation (AF) is the most common cardiac arrhythmia in clinical practice, and one of the main causes of ictus and strokes. Despite the advances in its comprehension, its thorough characterization and the choice of the most suitable therapy are still an open issue. Radiofrequency catheter ablation (CA) is becoming one of the most popular solutions. Yet, very little is known about its impact on heart substrate, thus leading to an inaccurate selection of positive responders to therapy, hence, the need for advanced signal processing tools able to quantify such impact in an objective and quantitative manner. Valuable information about AF can be provided by multilead electrocardiogram (ECG) recordings of heart electrical activity in a noninvasive and cost-effective manner. However, most of standard techniques are affected by several issues, such as their manual computation in only one ECG lead. This work aims at exploiting multilead ECG spatial variability through multivariate decomposition techniques, so as to extract proper predictors of AF termination by CA. This approach would help selecting a patient-tailored therapy, thus increasing CA success rate.
The continuous drive to further miniaturization is one of the basic research and development goals in industry producing data processing and storage devices, for reasons of economy, performance and energy minimisation. Modern magnetic hard drives have storage densities of hundreds of GBits / in² , but future storage devices are required to reach values of over 1 TBits/ in². Ideally, a single domain magnetic nanoparticle could represent a single data bit. A main issue for reaching this is the thermal stability of magnetisation if the superparamagnetic limit is reached. The most promising material is the bimetallic alloy FePt which offers large magnetic anisotropy due the presence of the ordered face centered tetragonal phase. In the frame of this objective a synthesis process by means of the physical approach of evaporation and recondensation in the gas phase was developed and optimized. Thereby ns-Pulsed Laser Ablation was applied on a FePt rod inside a vacuum-tight facility. The FePt nanoparticles were size selected by means of a Differential Mobility Analyzer and annealed in order to obtain desired spherical shape and magnetic properties.
Laser ablation in liquid is becoming an important technique for the generation of nanoparticles (NPs). Until now only pulsed lasers have been used, this is a pioneer work, using high-power, high-brightness continuous-wave (CW) fibre laser ablation in liquid, for the generation of NPs. A mechanism is proposed based on experimental observations, including high-speed imaging and emission spectroscopic analysis of the ablated plume. Three different target materials (Titanium, Nickel and Alpha-aluminium-oxide), submerged in either water or sodium dodecyl sulphate (SDS) solution at various concentrations were used. The characterisation of the generated metal-oxide NPs, in terms of size, size-distribution, shape, chemical composition and phase structure was carried out by UV-Vis photo-spectroscopy, transmission electron microscopy (TEM), high-resolution TEM with energy-dispersive X-rays spectroscopy and X-ray diffraction. This study paves a route towards a new application of CW fibre lasers. The book is useful to engineering students, professional engineers, researchers, academicians and scientists in materials, NPs characterisation, mechanical, laser processing and related disciplines.