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Le sujet de ce mémoire porte sur la synthèse d'un composé pour cathode d'accumulateurs au lithium, le LiMn2O4, dopé adéquatement, et sa mise en forme de film flexible. Un grand nombre de dopants déjà utilisés sont comparés afin d'étudier leur influence sur la capacité et la stabilité du composé, en fonction de leur valence et de la force des liaisons qu'ils forment avec l'oxygène. Un dopant potentiellement prometteur est donc choisi sur cette base.
Des poudres de précurseurs sont préparées par atomisation et calcinées afin d'obtenir le composé LiMn2O4 dopé. Ces poudres sont ensuite broyées afin d'en faire des suspensions stables, auxquelles sont ajoutés une matrice polymère, du noir de carbone, pour rendre le film conducteur, et un plastifiant afin d'assurer la flexibilité des films. Ces suspensions sont déposées par coulage en bande et permettent après séchage de récupérer un film flexible.
Des mesures électrochimiques sur ces poudres dopées et ces films montrent que le dopant choisi apporte en effet une amélioration de la tenue au cyclage du composé et que les films se comportent bien, même après de hautes vitesses de cyclage ; ils peuvent donc être utilisées comme cathodes flexibles pour accumulateurs au lithium.

LiMn2O4 --- dopage --- accumulateur Li-ion --- électrode flexible --- LiMn2O4 --- doping --- Li-ion battery --- flexible electrode --- Physique, chimie, mathématiques & sciences de la terre > Chimie

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This comprehensive, high-level surgical reference and atlas is tailored for surgeons who are undertaking training for cochlear implant procedures and implantable auditory devices and for experienced surgeons who would like to expand their knowledge, improve their skills and outcomes, and learn advanced surgical techniques. Following the principle underlying Professor Sanna's other successful publications, Surgery for Cochlear and Other Auditory Implants takes an integrated approach to anatomy, imaging, technology, decision making, surgical procedures described step by step, and clinical cases. This book allows readers to: Improve the efficiency and outcomes of cochlear implantation and other auditory implant surgeries Learn the required basic and advanced surgical techniques Evaluate different surgical options and types of implants Review common and uncommon variations of anatomy and malformations Understand issues and surgical modifications unique to pediatric cochlear implantation, to revision surgery, and in postmeningitis, otosclerosis, and NF2 cases Find decision-making algorithms for difficult pathologies Examine common and not so common intraoperative dilemmas and identify strategies to resolve them Review preoperative assessment and set up and outcomes Find out about classification systems in cochlear implant failure, malformations, otosclerosis, and post meningitis Supplementing the 1200 images within the book are 15 outstanding videos available on Thieme's MediaCenter demonstrating the implantation of the different cochlear implantation devices that are currently available and the application of brainstem implants in these situations: tumor removal, malformation (missing auditory nerve in children), and cochlear ossification.

Cochlear implants. --- Hearing disorders --- Auditory disorders --- Defective hearing --- Disorders of hearing --- Hearing defects --- Hearing impairments --- Communicative disorders --- Disabilities --- Ear --- Sensory disorders --- Cochlear stimulators --- Electrode implantation, Intracochlear --- Implantation, Intracochlear electrode --- Implants, Cochlear --- Intracochlear electrode implantation --- Stimulators, Cochlear --- Cochlea --- Electric stimulation --- Hearing aids --- Implants, Artificial --- Prosthesis --- Surgery. --- Diseases --- Surgery

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Today anyone can purchase technology that can track, quantify, and measure the body and its environment. Wearable or portable sensors detect heart rates, glucose levels, steps taken, water quality, genomes, and microbiomes, and turn them into electronic data. Is this phenomenon empowering, or a new form of social control? Who volunteers to enumerate bodily experiences, and who is forced to do so? Who interprets the resulting data? How does all this affect the relationship between medical practice and self care, between scientific and lay knowledge? Quantified examines these and other issues that arise when biosensing technologies become part of everyday life. The book offers a range of perspectives, with views from the social sciences, cultural studies, journalism, industry, and the nonprofit world. The contributors consider data, personhood, and the urge to self-quantify; legal, commercial, and medical issues, including privacy, the outsourcing of medical advice, and self-tracking as a "paraclinical" practice; and technical concerns, including interoperability, sociotechnical calibration, alternative views of data, and new space for design.

Biosensors. --- Medical instruments and apparatus. --- Biosensing Techniques. --- Monitoring, Physiologic --- Confidentiality. --- #SBIB:316.334.3M30 --- #SBIB:316.334.3M50 --- #SBIB:316.334.3M40 --- Confidential Information --- Secrecy --- Patient Data Privacy --- Privacy of Patient Data --- Privileged Communication --- Communication, Privileged --- Communications, Privileged --- Data Privacy, Patient --- Information, Confidential --- Privacy, Patient Data --- Privileged Communications --- Duty to Warn --- Privacy --- Disclosure --- Anonymous Testing --- Parental Notification --- Biosensing Technics --- Bioprobes --- Biosensors --- Electrodes, Enzyme --- Bioprobe --- Biosensing Technic --- Biosensing Technique --- Biosensor --- Electrode, Enzyme --- Enzyme Electrode --- Enzyme Electrodes --- Technic, Biosensing --- Technics, Biosensing --- Technique, Biosensing --- Techniques, Biosensing --- Microchemistry --- Apparatus, Medical --- Instruments, Medical --- Medical apparatus --- Medical devices --- Medical products --- Medicine --- Biomedical engineering --- Medical supplies --- Scientific apparatus and instruments --- Biodetectors --- Biological detectors --- Biological sensors --- Biomedical detectors --- Biomedical sensors --- Detectors --- Medical instruments and apparatus --- Physiological apparatus --- trends. --- Medische sociologie: gezondheidsgedrag --- Organisatie van de gezondheidszorg: algemeen, beleid --- Medische sociologie: zorgenverstrekkers, relatie met hulpvragers --- Apparatus --- Equipment and supplies --- Instruments --- Wearable Electronic Devices --- INFORMATION SCIENCE/Communications & Telecommunications --- INFORMATION SCIENCE/General --- COMPUTER SCIENCE/Human Computer Interaction --- Biosensing Techniques --- Confidentiality --- trends