Les méthodes d'induction électromagnétique permettent de caractériser la conductivité électrique des matériaux, dont les corps planétaires telluriques, depuis les couches superficielles de la croûte jusqu'aux zones les plus internes, dans le manteau inférieur. Pour une source de champ électromagnétique donnée, des courants sont induits dans les matériaux qui y sont soumis. Avec l'essor des données magnétiques satellitaires, de nouvelles méthodes d'analyse des données magnétiques permettent d'obtenir des images unidimensionnelles de la structure électrique de ces corps car la structure spatio-temporelle de la source électromagnétique en est bien connue. Les travaux de mon doctorat ont eu pour but de mettre en place une nouvelle méthode d'analyse permettant de déterminer des modèles de structure interne globaux pour n'importe quel corps du système solaire pour lequel on dispose de longues séries temporelles magnétiques satellitaires. Après avoir testé cette méthode sur des modèles synthétiques et l'avoir appliqué au cas de données réelles terrestre pour lesquelles des études d'induction électromagnétiques antérieurs permettent d'avoir un a priori sur le modèle de conductivité électrique attendu, nous avons obtenu les premiers modèles de conductivité électrique martien en utilisant les données magnétiques du satellite Mars Global Surveyor. Ces résultats nous ont permis de valider des modèles de structure interne antérieurs établis à partir d'analyses géochimiques et minéralogiques des météorites martiennes. Cette méthode innovante est aujourd'hui la seule capable d'obtenir une image électrique des manteaux telluriques à partir de données magnétiques satellitaires pour des corps autres que la Terre ou la Lune et pour lesquels aucun a priori sur la structure spatio-temporelle du champ électromagnétique inducteur externe n'est nécessaire. / My Ph.D. work consists in the investigation of satellite magnetic data to infer the deep internal conductivity distribution. I developed a new global electromagnetic induction method applied to planetary magnetic datasets without strong a priori hypothesis on the external inducing source field. My method is based on a spectral correction of gapped data magnetic time series to restore the time spectral content of the source field. This external source depends on the planetary environment and is therefore different for each planetary bodies. The method aims at recovering with a maximum accuracy internal and external spherical harmonic coefficients of transients fields, whose ratio is used as a transfer function to retrieve the internal distribution of electrical conductivity. While for the Earth, a good proxy of the source field activity is the Dst index, no such proxy exists for other planets. Hence, for our study of Mars transient magnetic field from MGS, one of the major part of my work is the determination of an appropriate continuous proxy for the external variability. On Earth the external electromagnetic source is well known, and may be described by a spherical harmonic geometry dominated by the dipole term. This source field may be characterized using a magnetic activity index named the Dst index. The method has been tested on synthetic data generated within the framework of SWARM mission. This mission consists of a 3 satellites constellation. One of the main objectives is to infer the 3D electrical distribution in the deep Earth. SWARM synthetic data consist in a time series of spherical harmonic (SH) coefficients, external and internal, generated from a simple non-realistic 3D model. In this model, several regional and local conductors, in a radially symmetric 3 layers model have been embedded. Using this dataset, our method give satisfactory results. We have been able to obtain the external and internal SH coefficients - for the first SH degree, which is known to be the most energetic degree of the external source - using only one of the 3 synthetic time series. Then, the method has been used on real data from Ørsted. In this case, we had to pre-process the data to correct from ionospheric and aligned currents contributions. We developed a statistical analysis to remove the ionospheric field using 2 geomagnetic indices : AL and Kp. Hence, we have enlarged data toward higher and lower latitudinal zones than what has been done in previous works. Finally, we have been able to obtain 1D conductivity models, which fits reasonably with existing conductivity data in the deep Earth. Finally, we worked on Mars Global Surveyor (MGS) data. One of the most time consuming parts of this work was the determination of an appropriate continuous proxy for the external variability in the vicinity of Mars. Without any measurements of the IMF (Interplanetary Magnetic Field) during MGS sciences acquisition, we have used ACE (Advanced Composition Explorer) data. This satellite orbits around the L1 point of the Sun-Earth system, measuring solar wind magnetic characteristics. We have time-shifted ACE data to Mars position for 4 temporal windows where Mars and Earth were closed to the same Parker's spiral's arm, and finally determined a proxy explaining the major part of the variability observed in Mars data. Despite numerous gaps in MGS data, we have been able to establish the 1D conductivity distribution, fitting reasonably existing geochemical models. Although the method may be unstable for some cases, we obtained satisfactory results for in depth conductivity of the planet.

This work deals with the power supply of wireless sensors. When using a wireless sensor is desirable application of alternative energy sources, because the primary cells or batteries may reduce the extent or length of service of the sensor itself. Ambient energy can be used as a suitable alternative source. This energy must be in an appropriate form, which allows its conversion to electric energy. These appropriate, already used types include: solar en., temperature gradient en., en. of flowing liquids, vibration, etc. The advantage of vibrations is its presence in almost all mechanical systems. One of the possibilities for using the vibration of machine systems for power supply wireless sensors is using the vibration power generator with oscillating component. The generator must be designed so that its resonance frequency coincides with the frequency of vibration in the machine system. This method can be used only if the machinery system vibrations at least partially constant. Another option is to use the vibrations caused by, for example, transit transport, or different step acting factor. In this case, it is desirable that the generator is designed with variable resonant frequency, which can partly be achieved, for example, integrating several oscillating component in the body of generator. After the general analysis of the problem, graduation theses will be concerned with the possibility of use of energy from the short damped oscillation and step impulse. Focusing on a proposal of multi-element structures.

Le but du projet est de synthétiser un film de polymères à double mémoire de formes avec une sensibilité à la lumière ainsi qu’à un champ magnétique. Afin de rendre le polymère sensible à ces stimuli, des nanoparticules d’oxyde de fer (II,III) furent enrobées d’une couche de polydopamine. Par après, du polycaprolactone et du poly(caprolactone-co-pentadecalactone) furent synthétisés par polymérisation enzymatique à ouverture de cycle. Les polymères furent méthacrylés en fin de chaînes, remplaçant le groupe alcool par une double liaison qui est par la suite utilisée pour une réticulation. Les films de polymères étaient obtenus en combinant les nanoparticules et les polymères via une réaction click de type « thiol-ène ». Des films avec une teneur de nanoparticules de 0 à 1 pour cent en poids furent ainsi synthétisés. L’alternance entre deux formes était possible grâce à deux phénomènes physiques : l’élongation induite par cristallisation et la contraction induite par la fusion. Ces phénomènes sont causés par la fusion et la cristallisation du polycaprolactone, tandis que le poly(caprolactone-co-pentadécalactone) restait maintenu dans un état solide cristallin sur la gamme de températures étudiée. Les films de polymères changeaient de forme en étant chauffés par exposition à la lumière. Les films avec nanoparticules se contractaient quand ils étaient exposés à la lumière et retournaient à leur forme originale quand la lumière était éteinte. Le chauffage par induction avec un champ magnétique alternatif fut aussi un succès. Les films avec nanoparticules se contractaient à l’intérieur d’une bobine de cuivre avec un champ magnétique présent lorsqu’un courant électrique circulait dans la bobine. Les films retournaient à leur forme d’origine lorsque le champ magnétique était coupé. Il fut observé que plus la teneur en nanoparticules au sein du film de polymères était élevée, le plus court le temps de réponse était avant qu’un mouvement de contraction ne soit observé. Aucun changement de volume ne fut observé en chauffant des échantillons de films de polymères de 20 à 60 °C, confirmant, dans les conditions actuelles d’évaluation, que la contraction induite par la fusion et que l’élongation induite par cristallisation se produisent sans causer un changement de volume du film. / The project goal is to synthesize a two-way shape memory polymer that is both magnetically and light responsive. To make the polymer responsive to these stimuli, iron oxide (II, III) nanoparticles with a polydopamine coating were first synthesized. Afterwards, polycaprolactone and poly(caprolactone-co-pentadecalactone) were synthesized by enzymatic ring-opening polymerization. The polymer was then methacrylated at the terminal positions, replacing the alcohol with a double bond which was then used for crosslinking. Polymer films were prepared by combining the nanoparticles and the polymer by a “thiol-ene” click reaction. Films containing from 0 to 1 weight percent of nanoparticles were synthesized. Switching between the two shapes was possible by two physical phenomena: crystallization induced elongation and melting induced contraction. These are caused by the fusion and crystallization of the polycaprolactone network, while the poly(caprolactone-co-pentadecalactone) is consistently maintained in its crystalline solid state in a specific temperature range. The polymer films changed shapes due to heating when exposed to light. Films with nanoparticles contracted when exposed to light and they returned to their original form when the light was turned off. Induction heating with an alternating magnetic field was also successful. The polymer film with magnetic nanoparticles contracted inside a copper coil when the magnetic field was generated by applying electric current to the coil. The film returned to its original shape when the magnetic field was turned off. It was found that the higher the content of nanoparticles in the polymer filler, the shorter the response time was before a contraction movement was observed. No change in the polymer volume during heating of a film sample from 20 to 60 °C was observed, confirming that melting induced contraction and crystallization induced elongation occurred without change in volume under conditions examined.

Em 2013, foi implantado no Brasil o Programa Nacional de Segurança do Paciente (PNSP), que através da Resolução RDC No 36, prevê que as instituições de saúde brasileiras devem apresentar um Plano de Segurança do Paciente (PSP) para as situações que possam proporcionar a ocorrência de eventos adversos (EAs), ou seja, lesão ou dano não intencional causado ao paciente pela intervenção assistencial e não pela doença base. O PSP é um documento com embasamento científico que aponta as situações de risco e descreve estratégias e ações definidas pelo serviço de saúde para a gestão do risco com objetivo de prevenção e redução dos EA em todas as fases da assistência. O implante de eletrodos para estimulação encefálica profunda (EEP) é um procedimento realizado rotineiramente no Hospital Marcelino Champagnat (HMC), localizado na cidade de Curitiba – PR, para melhorar a sintomatologia e a qualidade de vida de pacientes portadores de determinados distúrbios neurológicos crônicos. A confiabilidade e a precisão do posicionamento dos eletrodos cerebrais após a implantação de sistemas de EEP é de suma importância para a eficácia do método, sendo a Imagem por Ressonância Magnética (IRM) pós-operatória, atualmente, o padrão ouro para documentação do correto posicionamento dos eletrodos. Entretanto, a interação do sistema de EEP com o campo de radiofrequência do equipamento de IRM pode constituir uma fonte de EAs, uma vez que possibilita a indução de correntes elétricas com potencial de causar lesões térmicas ao paciente em locais de alta resistência. As recomendações de segurança dos fabricantes para a maioria dos sistemas de EEP implantados são bastante restritivas e resultam em longos tempos de exame ou em imagens de baixa qualidade, fatores que dificultam a prática em muitos centros. Estudos in vitro revelam que o aquecimento excessivo ocorre sob determinadas configurações, enquanto outras não oferecem risco fisiológico ao paciente. Estudos clínicos com base em vasta experiência sustentam a evidência de que é possível realizar exames pós-operatórios de forma satisfatória e sem a ocorrência de EAs utilizando parâmetros menos restritivos que aqueles determinados pelos fabricantes, desde que alguns padrões de segurança sejam cuidadosamente seguidos. Dessa forma, o presente trabalho propõe a elaboração de um PSP para a situação específica de pacientes com sistemas de EEP submetidos à exames de IRM no HMC, com base nas recomendações de segurança do fabricante e na revisão sistemática da literatura. De acordo com a base de dados consultada, um total de 26 artigos científicos foram considerados relevantes e permitiram identificar as possíveis fontes de risco de forma a evitá-las, colaborando com a conclusão satisfatória do PSP. Além de suprir a demanda local, o presente trabalho visou também promover a cultura de segurança do paciente e despertar a atenção para a necessidade de interposição de barreiras às diversas oportunidades de EAs que os setores de radiologia podem oferecer. A metodologia aqui proposta pode servir, ainda, de base para que outros centros de diagnóstico por imagem componham seus próprios PSPs. / In 2013, the National Program Patient Safety (PNSP) was implemented in Brazil through Resolution RDC 36, providing that the Brazilian health institutions must have a Patient Safety Plan (PSP) for situations that may lead to adverse events (AEs), which are unintentional injury or damage caused to the patient by the health care intervention and not by the primary disease. The PSP is a document with scientific basis that points to hazardous situations and describes strategies and actions defined by the health service for risk management in order to prevent and reduce AEs in all phases of patient care. Implantation of Deep Brain Stimulation (DBS) devices is considered a routine procedure at the Hospital Marcelino Champagnat (HMC), located in Curitiba – PR, and it consists in a practice widely used to improve symptoms and quality of life of patients with certain chronic neurological disorders.The reliability and accuracy of the final brain positioning of the leads, after the DBS implantation are of paramount importance to assure efficacy. Currently, post-operative Magnetic Resonance Imaging (MRI) is the gold standard for the documentation of the correct lead positioning. However, the interaction between the DBS system and the MRI radiofrequency field could represent an important source of adverse events (EAs) since it allows electric currents induction with potential to cause local thermal injuries on high resistance sites. The safety recommendations from the DBS system manufacturers for most of the already deployed systems are quite restrictive resulting in long examination times or low quality images, which compromises the practice in many centers. Thus, the present work proposes the development of a PSP based on the manufacturer's safety recommendations and a systematic review of the literature to the specific situation of patients with DBS systems undergoing MRI scans at the HMC. We found a total of 26 papers, that were considered relevant and allowed us to identify the potential sources of risk in order to avoid them, collaborating to the successful elaboration of the PSP. Besides supplying local demand, this work also aims to promote patient safety and draw attention to the need of interposing barriers in order to avoid significant AEs situations that a radiology department may be presented with. Moreover, the methodology proposed here can serve as a basis for other imaging centers to compose their own PSPs.

Em 2013, foi implantado no Brasil o Programa Nacional de Segurança do Paciente (PNSP), que através da Resolução RDC No 36, prevê que as instituições de saúde brasileiras devem apresentar um Plano de Segurança do Paciente (PSP) para as situações que possam proporcionar a ocorrência de eventos adversos (EAs), ou seja, lesão ou dano não intencional causado ao paciente pela intervenção assistencial e não pela doença base. O PSP é um documento com embasamento científico que aponta as situações de risco e descreve estratégias e ações definidas pelo serviço de saúde para a gestão do risco com objetivo de prevenção e redução dos EA em todas as fases da assistência. O implante de eletrodos para estimulação encefálica profunda (EEP) é um procedimento realizado rotineiramente no Hospital Marcelino Champagnat (HMC), localizado na cidade de Curitiba – PR, para melhorar a sintomatologia e a qualidade de vida de pacientes portadores de determinados distúrbios neurológicos crônicos. A confiabilidade e a precisão do posicionamento dos eletrodos cerebrais após a implantação de sistemas de EEP é de suma importância para a eficácia do método, sendo a Imagem por Ressonância Magnética (IRM) pós-operatória, atualmente, o padrão ouro para documentação do correto posicionamento dos eletrodos. Entretanto, a interação do sistema de EEP com o campo de radiofrequência do equipamento de IRM pode constituir uma fonte de EAs, uma vez que possibilita a indução de correntes elétricas com potencial de causar lesões térmicas ao paciente em locais de alta resistência. As recomendações de segurança dos fabricantes para a maioria dos sistemas de EEP implantados são bastante restritivas e resultam em longos tempos de exame ou em imagens de baixa qualidade, fatores que dificultam a prática em muitos centros. Estudos in vitro revelam que o aquecimento excessivo ocorre sob determinadas configurações, enquanto outras não oferecem risco fisiológico ao paciente. Estudos clínicos com base em vasta experiência sustentam a evidência de que é possível realizar exames pós-operatórios de forma satisfatória e sem a ocorrência de EAs utilizando parâmetros menos restritivos que aqueles determinados pelos fabricantes, desde que alguns padrões de segurança sejam cuidadosamente seguidos. Dessa forma, o presente trabalho propõe a elaboração de um PSP para a situação específica de pacientes com sistemas de EEP submetidos à exames de IRM no HMC, com base nas recomendações de segurança do fabricante e na revisão sistemática da literatura. De acordo com a base de dados consultada, um total de 26 artigos científicos foram considerados relevantes e permitiram identificar as possíveis fontes de risco de forma a evitá-las, colaborando com a conclusão satisfatória do PSP. Além de suprir a demanda local, o presente trabalho visou também promover a cultura de segurança do paciente e despertar a atenção para a necessidade de interposição de barreiras às diversas oportunidades de EAs que os setores de radiologia podem oferecer. A metodologia aqui proposta pode servir, ainda, de base para que outros centros de diagnóstico por imagem componham seus próprios PSPs. / In 2013, the National Program Patient Safety (PNSP) was implemented in Brazil through Resolution RDC 36, providing that the Brazilian health institutions must have a Patient Safety Plan (PSP) for situations that may lead to adverse events (AEs), which are unintentional injury or damage caused to the patient by the health care intervention and not by the primary disease. The PSP is a document with scientific basis that points to hazardous situations and describes strategies and actions defined by the health service for risk management in order to prevent and reduce AEs in all phases of patient care. Implantation of Deep Brain Stimulation (DBS) devices is considered a routine procedure at the Hospital Marcelino Champagnat (HMC), located in Curitiba – PR, and it consists in a practice widely used to improve symptoms and quality of life of patients with certain chronic neurological disorders.The reliability and accuracy of the final brain positioning of the leads, after the DBS implantation are of paramount importance to assure efficacy. Currently, post-operative Magnetic Resonance Imaging (MRI) is the gold standard for the documentation of the correct lead positioning. However, the interaction between the DBS system and the MRI radiofrequency field could represent an important source of adverse events (EAs) since it allows electric currents induction with potential to cause local thermal injuries on high resistance sites. The safety recommendations from the DBS system manufacturers for most of the already deployed systems are quite restrictive resulting in long examination times or low quality images, which compromises the practice in many centers. Thus, the present work proposes the development of a PSP based on the manufacturer's safety recommendations and a systematic review of the literature to the specific situation of patients with DBS systems undergoing MRI scans at the HMC. We found a total of 26 papers, that were considered relevant and allowed us to identify the potential sources of risk in order to avoid them, collaborating to the successful elaboration of the PSP. Besides supplying local demand, this work also aims to promote patient safety and draw attention to the need of interposing barriers in order to avoid significant AEs situations that a radiology department may be presented with. Moreover, the methodology proposed here can serve as a basis for other imaging centers to compose their own PSPs.

This master thesis deals with design and realization of multistage electromagnetic accelerating device (gun) and possibilities to increase its effectivity. This work contains a simulation of a magnetic circuit and designs of each components, inclusive of control circuits. Reached effectivity will be measured by appropriate methods.

This diploma work deals with description of pressure sewerage networks. First of all is focused on statistical evaluation of pressure sewerage operation in Káraný municipality where was evaluated waste water flow and pressure on sewerage network.

This thesis deals with modifications to the construction of vibration-to-electricity energy converter, which is one of possible solutions to problem of sustainable and stable energy source for wireless sensor supply. Upon the exploration of the present state of this problem, new construction of generator is proposed. The aim of this proposal is to enhance the existing generator properties with respect to retention of its dimensions and its weight. Results obtained by simulations of model with proposed parameters are presented and analysed.

The purpose of this study was to investigate physics undergraduate students’ conceptual change in the concepts of electric potential and energy (EPE) and electromagnetic induction (EMI). Along with this, categorization of students’ conceptions was done based on students’ epistemological and ontological descriptions of these concepts. In addition, the effect of cognitive perturbation using physics interactive simulations (CPS) in relation to cognitive conflict using physics interactive simulations (CCS) was investigated. A pragmatic mixed methods approach was used in a quasi-experimental design. Data were collected by using the modified Diagnostic Exam of Electricity and Magnetism (DEEM), focus group discussions (FGD) and concept maps (CM). Framework analysis was conducted separately on FGD and CM qualitative data to categorize students’ conceptions while concentration analysis was used to categorize students’ responses to the modified DEEM into three levels, during pre and post intervention. In the qualitative results, six categories of alternative conceptions (naive physics, lateral alternative conceptions, ontological alternative conceptions, Ohm’s P-Primes/ P-Primes, mixed conceptions and loose ideas) and two categories of conceptual knowledge (hierarchical and relational) were identified. The alternative conceptions were less frequently and inconsistently revealed within and across the categories. It was concluded that the categories have common characteristics of diversified distribution of alternative conceptions and multiple alternative conceptions of specific concepts within and across the categories. Most of the categories found in pre intervention persisted in post intervention, but with a lesser percentage extensiveness of categories of alternative conceptions in the CPS than in the CCS class and more percentage extensiveness of categories of conceptual knowledge in the CPS than in the CCS class. ANCOVA was separately conducted on the scores of 45 students on the modified DEEM and CM tests to compare the effectiveness of the CCS and CPS. The results showed a significant difference between the two classes of the post test scores on the DEEM test, (1, 36) = 4.66, p=0.04 and similarly, on the CM test, (1, 31) = 8.33, p=0.007. Consequently, it was concluded that there is a statistically significant difference between CPS and CCS in changing students’ alternative conceptions towards scientific conceptions favoring CPS. To characterize and compare students’ conceptual change of both treatment classes, Hake’s average normalized gain <g> from pre to post scores (the modified DEEM and the CM) were analyzed. Finally, it is suggested that in abstract conceptual areas of EM, cognitive perturbation through interactive simulations is more effective than cognitive conflict through interactive simulations in facilitating conceptual change, and, thus, should guide classroom instruction in the area. Furthermore, recommendations are also suggested for guiding future research in this area. / Science and Technology Education / D. Phil. (Mathematics, Science and Technology Education (Physics Education))

Nesta pesquisa são apresentadas as contribuições dos métodos GPR e eletromagnético indutivo (equipamento EM-38) nos estudos de sítios arqueológicos de sambaquis costeiros Jabuticabeira II, Santa Marta IV, V, VII e VIII, e Encantada III, localizados no município de Jaguaruna, litoral centro-sul de Santa Catarina. Estes sítios são caracterizados por acúmulos de conchas carbonáticas construídos por sociedades do período pré-colonial (7,5 a 1,3 mil anos AP). Os estudos foram desenvolvidos, visando o mapeamento de artefatos de interesse arqueológico e de estruturas estratigráficas que auxiliem a compreensão do processo construtivo e funcional destes sítios. A interpretação dos resultados GPR foi apoiada nas modelagens numéricas GPR 2D e nas imagens 3D e integrada com os levantamentos EM-38, e tiveram como objetivos orientar as escavações arqueológicas. Os resultados permitiram encontrar alvos e artefatos arqueológicos, reduziram os custos no processo exploratório e preservaram o patrimônio histórico. Complementando o processo de interpretação integrada, os perfis estratigráficos e as análises granulométricas dos sedimentos provenientes dos furos de sondagens foram importantes para a definição dos ambientes de deposição onde os sambaquis estão assentados, corroborando de maneira significativa com as pesquisas em desenvolvimento no litoral de Santa Catarina. Em termos metodológicos, as antenas GPR blindadas de 200 MHz propiciaram um melhor compromisso entre a profundidade de investigação e a resolução vertical das camadas geo-arqueológicas, e a implementação da técnica de aquisição radial permitiu um mapeamento detalhado do sítio Jabuticabeira II de forma rápida, cobrindo uma grande área. Por outro lado, com o método eletromagnético indutivo (EM-38), a correção do efeito topográfico dos dados melhorou os contrastes de condutividade elétrica entre as estruturas arqueológicas e o background, permitindo assim, que os alvos pontuais, antes mascarados pela influência da topografia, fossem realçados. Com relação aos resultados geofísicos em estudos geoarqueológicos, no sambaqui Jabuticabeira II, foi possível caracterizar a geometria de uma estrutura geológica, associada a um paleo-canal e a deposição dos sedimentos em barras de pontal; mapear alvos arqueológicos e metálicos contemporâneos; traçar os limites do sítio; imagear uma camada conchífera, camadas antrópicas recentes e a profundidade do nível dágua; detectar a presença de dois sistemas deposicionais, paleolaguna e paleoduna, bem como delimitar o assentamento do sítio sobre estes ambientes por meio das informações das análises granulométricas dos sedimentos coletados nos furos de sondagens. Nos sambaquis de Santa Marta IV, V, VII e VIII, a integração dos dados GPR e EM38 permitiram o mapeamento de diversos alvos de grande importância para os estudos arqueológicos, tais como, paleofogueiras, sepultamentos e concentração de materiais cerâmicos e líticos, bem como feições geológicas, tais como, estruturação de camadas e paleotômbolos. Além disso, a redução do efeito topográfico sobre os dados de condutividade elétrica (EM-38) permitiu relacionar as regiões anômalas com um paleofogueira e uma concentração de material cerâmico. No sambaqui Encantada III, duas fortes anomalias GPR, caracterizadas por reflexões hiperbólicas, estavam associadas: i) a uma estrutura escura pontual, caracterizada como um bolsão de conchas carbonáticas; e ii) a presença de uma raiz de árvore concrecionada, que embora não seja de interesse arqueológico, é significativa, pois serve como um bom exemplo de ambiguidade na interpretação de dados geofísicos. Também foi possível delimitar o assentamento do sítio sobre os sedimentos da paleo-laguna, evidenciado pelas análises granulométricas dos sedimentos. / In this study, GPR and electromagnetic induction (EM-38 instrument) methodcontributions in coastal sambaqui archaeological sites (Jabuticabeira II, Santa Marta IV, V, VII and VIII as well as Encantada III) are presented. These sites are placed in Jaguaruna, Santa Catarina center-south coast. They are characterized by accumulation of carbonate shells built by societies in pre-colonial period (7.5 to 1.3 thousand years BP). The studies were developed aimed at mapping archaeological artifacts and stratigraphic structures that help to understand constructive and functional process of these sites. The interpretation of GPR results was supported by 2D GPR numerical modeling, 3D images and integrated with EM-38 surveys. They had as objectives to guide archaeological excavations. The results allowed finding archaeological targets and artifacts, reduced costs in exploratory process, and preserved historical heritage. Complementing integrated interpretation process, stratigraphic profiles and granulometric analysis of sediment from sounding drifts were important for defining the deposition environments where sambaquis (shell mounds) are settled, significantly supporting in developing research on Santa Catarina coast. Methodologically, 200 MHz shielded GPR antennas provided a better agreement between depth of investigation and vertical resolution of geoarchaeological layers, and the implementation of radial acquisition technique allowed a quickly detailed mapping of Jabuticabeira II site, covering a large area. Furthermore, with electromagnetic inductive method (EM-38), the topographic effect correction of data has improved the contrast in electrical conductivity between archaeological structures and background. Thus, punctual targets before masked by topography influence were highlighted. Regarding geophysical results in geoarchaeological studies, in Jabuticabeira II sambaqui, it was possible to characterize the geometry of a geological structure associated with a paleochannel and sediment deposition in point bars; to map archaeological and contemporary metal targets; to trace site boundary; to image shell layer, recent anthropic layers and water level depth; to detect the presence of two deposicional systems, paleolagoon and paleodune as well as to delimit the settlement site on these environments through information of granulometric analysis of sediments collected in sounding drifts. In Santa Marta IV, V, VII and VIII sambaquis, GPR and EM-38 data integration allowed mapping several targets of great importance for archaeological studies, such as paleofires, burials and concentration of ceramic and litic material as well as geological features, such as layer structuring and paleotombolos. Moreover, the reduction of topographic effect on electrical conductivity data (EM-38) allowed relating anomalous regions with a paleofire, and a concentration of ceramic material. In Encantada III sambaqui, two strong GPR anomalies characterized by hyperbolic reflections were associated with: i) a dark punctual structure, characterized as a pocket of shell carbonate, and ii) the presence of a concretion tree root that is significant, despite not of archaeological interest, because it serves as a good example of ambiguity in geophysical data interpretation. It was also possible to delimit the settlement site on paleolagoon sediments, evidenced by granulometric analysis of sediments.