Academic literature on the topic 'RI sensor'
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Journal articles on the topic "RI sensor"
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Duan, Dewen, Jianhao Yang, Yi Tang, and Yi-Yuan Xie. "Diamond-Based Fiber-Optic Fabry–Perot Interferometer with Ultrawide Refractive-Index Measurement Range." Photonics 11, no. 8 (2024): 763. http://dx.doi.org/10.3390/photonics11080763.
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The majority of Fabry–Perot interferometer (FPI) tip refractive index (RI) sensors utilize silica optical fiber as the cavity material, with an RI of approximately 1.45. This restricts their applicability in measuring the RI of liquids with an RI of approximately 1.45. Here, we propose a fiber-optic FPI-tip RI sensor by bonding a flat, thin diamond film onto the apex of a single-mode optical fiber. The FPI cavity is constructed from a diamond with an RI of approximately 2.4, theoretically enabling the sensor to achieve an ultrawide RI measurement range of 1 to 2.4. A theoretical comparison of its measurement performance was conducted with that of an FPI-tip RI sensor whose cavity is formed by silica fiber. Additionally, an experimental examination of the device’s RI measurement performance was conducted. The results show that the sensor has visibility to the RI unit of −0.4362/RIU in the RI range of 1.33 to 1.40. Combined with other narrow-RI-ranged high-sensitivity sensors, our proposed RI sensor has the potential for use in a wide range of applications.
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Ahsani, Vahid, Farid Ahmed, Martin Jun, and Colin Bradley. "Tapered Fiber-Optic Mach-Zehnder Interferometer for Ultra-High Sensitivity Measurement of Refractive Index." Sensors 19, no. 7 (2019): 1652. http://dx.doi.org/10.3390/s19071652.
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A Mach-Zehnder interferometer (MZI) based fiberoptic refractive index (RI) sensor is constructed by uniformly tapering standard single mode fiber (SMF) for RI measurement. A custom flame-based tapering machine is used to fabricate microfiber MZI sensors directly from SMFs. The fabricated MZI device does not require any splicing of fibers and shows excellent RI sensitivity. The sensor with a cladding diameter of 35.5 µm and length of 20 mm exhibits RI sensitivity of 415 nm/RIU for RI range of 1.332 to 1.384, 1103 nm/RIU for RI range of 1.384 to 1.4204 and 4234 nm/RIU for RI range of 1.4204 to 1.4408, respectively. The sensor reveals a temperature sensitivity of 0.0097 nm/°C, which is relatively low in comparison to its ultra-high RI sensitivity. The proposed inexpensive and highly sensitive optical fiber RI sensors have numerous applications in chemical and biochemical sensing fields.
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Mohd Syahnizam Sulaiman, Punithavathi Thirunavakkarasu, Jean-Louis Auguste, Georges Humbert, Farah Sakiinah Roslan, and Norazlina Saidin. "Long Period Fiber Grating for Refractive Index Sensing." Journal of Advanced Research in Applied Sciences and Engineering Technology 30, no. 2 (2023): 154–62. http://dx.doi.org/10.37934/araset.30.2.154162.
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Refractive index (RI) sensors are very valuable in first level detection of changes to the environment. In this project an optical fiber-based sensor is proposed to detect changes in surrounding RI. Most optical fiber sensors require tapering to be done to enhance the light interaction with the surrounding. This causes the fiber to become fragile and difficult to handle. In this research, optical fibers with long period gratings (LPG) are proposed to overcome this issue. Zinc Oxide (ZnO) nanomaterial was deposited over the LPG region using seeding method to enhance the performance of the sensor. The LPG fiber sensor was then used to investigate RI changes in the environment. A broadband laser source was used as the input and an optical spectrum analyser was used to observe the output light spectrum of the LPG sensor for different refractive index mediums. The ZnO coated LPG showed a sensitivity of 428.57 nm/RIU over an RI range of 1 – 1.3578.
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Teng, Deng, Liu, et al. "Refractive Index Sensor Based on Twisted Tapered Plastic Optical Fibers." Photonics 6, no. 2 (2019): 40. http://dx.doi.org/10.3390/photonics6020040.
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We proposed a refractive index (RI) sensor employing two twisted tapered plastic optical fibers (POFs). The tapered POFs were fabricated by a heating and drawing method and were twisted around each other to form a coupled structure. The sensor consisted of two input ports, a twisted region, and two output ports. The tapered POF could make the light couple from one POF to the other easily. The twisted tapered POFs could constitute a self-referencing sensor, and by monitoring the changes of the coupling ratio, the variations of the external medium RIs could be measured. The RI sensing performances for the sensors with different fiber diameters and twisted region lengths were studied. The sensitivities of 1700%/RIU and −3496%/RIU in the RI ranges of 1.37–1.41 and 1.41–1.44 were obtained, respectively. The sensor is a low-cost solution for liquid RI measurement, which has the features of simple structure and easy fabrication.
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Mu, Zonghao, Tian Tian, Yiwei Ma, Song Li, and Tao Geng. "Ultra-Compact Mach–Zehnder Refractometer Based on Rice-Shaped Air Cavity Beam Expansion." Photonics 12, no. 6 (2025): 602. https://doi.org/10.3390/photonics12060602.
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This paper reports and demonstrates, for the first time, a Mach–Zehnder interferometer (MZI) sensor for refractive index (RI) detection based on a rice-shaped air cavity (RAC). In this design, RACs are inserted on both sides of a no-core fiber (NCF), functioning as a beam expander and receiver. When the input light enters the NCF through the RAC, it is fully excited from the fundamental mode to higher-order modes within just 500 μm of propagation. This enables the sensor to achieve exceptionally high sensitivity in external RI detection. By adjusting the width of the RAC, the RI sensitivity can be effectively tuned. When the RAC measures 30.6 × 70 μm, the two selected transmission peaks reach maximum RI sensitivities of 1550.41 nm/RIU and 1810.89 nm/RIU, respectively. Notably, the total length of the sensor is only 0.64 mm, offering a promising approach for the development of ultra-compact RI sensors in the future.
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Takashima, Yuusuke, Masanobu Haraguchi, and Yoshiki Naoi. "GaN-Based High-Contrast Grating for Refractive Index Sensor Operating Blue–Violet Wavelength Region." Sensors 20, no. 16 (2020): 4444. http://dx.doi.org/10.3390/s20164444.
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Owing to its versatility, optical refractive index (RI) sensors with compact size and high chemical stability are very suitable for a wide range of the applications in the internet of things (IoT), such as immunosensor, disease detection, and blood mapping. In this study, a RI sensor with very simple system and high chemical stability was developed using GaN-based high-contrast grating (HCG). The designed HCG pattern was fabricated on GaN-film grown on c-plane sapphire substrate. The fabricated GaN-HCG sensor can detect minuscule RI change of 1.71 × 10–3 with extreme simple surface normal irradiation system. The light behavior inside the GaN-HCG was discussed using numerical electromagnetic field calculation, and the deep understand of the sensing mechanism was provided. The simple system and very high chemical stability of our sensor exploit RI sensing applications in IoT society.
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Leal-Junior, Arnaldo, Guilherme Lopes, Leandro C. Macedo, Welton Duque, Anselmo Frizera, and Carlos Marques. "Heterogeneous Optical Fiber Sensor System for Temperature and Turbidity Assessment in Wide Range." Biosensors 12, no. 11 (2022): 1041. http://dx.doi.org/10.3390/bios12111041.
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This paper presents the development of an optical fiber sensor system for multiparametric assessment of temperature and turbidity in liquid samples. The sensors are based on the combination between fiber Bragg gratings (FBGs), intensity variation and surface plasmon resonance (SPR) sensors. In this case, the intensity variation sensors are capable of detecting turbidity with a resolution of about 0.5 NTU in a limited range between 0.02 NTU and 100 NTU. As the turbidity increases, a saturation trend in the sensor is observed. In contrast, the SPR-based sensor is capable of detecting refractive index (RI) variation. However, RI measurements in the turbidity calibrated samples indicate a significant variation on the RI only when the turbidity is higher than 100 NTU. Thus, the SPR-based sensor is used as a complementary approach for the dynamic range increase of the turbidity assessment, where a linearity and sensitivity of 98.6% and 313.5 nm/RIU, respectively, are obtained. Finally, the FBG sensor is used in the temperature assessment, an assessment which is not only used for water quality assessment, but also in temperature cross-sensitivity mitigation of the SPR sensor. Furthermore, this approach also leads to the possibility of indirect assessment of turbidity through the differences in the heat transfer rates due to the turbidity increase.
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Wang, Xiangxian, Xiaoxiong Wu, Jiankai Zhu, Zhiyuan Pang, Hua Yang, and Yunping Qi. "Theoretical Investigation of a Highly Sensitive Refractive-Index Sensor Based on TM0 Waveguide Mode Resonance Excited in an Asymmetric Metal-Cladding Dielectric Waveguide Structure." Sensors 19, no. 5 (2019): 1187. http://dx.doi.org/10.3390/s19051187.
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This study proposes a highly sensitive refractive-index (RI) sensor based on a TM0 waveguide mode resonance excited in an asymmetric metal-cladding dielectric waveguide structure, where the analyte serves as the guiding layer. By scanning the wavelength at fixed angles of incidence, the reflection spectra of the sensor were obtained. The results showed that the resonance wavelength redshifted dramatically with increases in the analyte RI, which indicates that this approach can be used to sense both the resonance wavelength and the analyte RI. Based on this approach, we investigated the sensing properties, including the sensitivity and figure of merit, at fixed incident angles of 60° and 45°, at which the sensitivity of the sensor reached 7724.9 nm/RIU (refractive index units) and 1339 nm/RIU, respectively. Compared with surface plasmon resonance sensors, which are based on a similar structure, the proposed sensor can accept a more flexible range of incident angles and a wider sensing range of analyte RI. This approach thus has tremendous potential for use in numerous sensing domains, such as biochemical and medical analyses.
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Fotiadis, Konstantinos, Evangelia Chatzianagnostou, Dimosthenis Spasopoulos, et al. "Theoretical and Experimental Analysis of Single-Arm Bimodal Plasmo-Photonic Refractive Index Sensors." Sensors 24, no. 12 (2024): 3705. http://dx.doi.org/10.3390/s24123705.
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In this paper, we study both theoretically and experimentally the sensitivity of bimodal interferometric sensors where interference occurs between two plasmonic modes with different properties propagating in the same physical waveguide. In contrast to the well-known Mach–Zehnder interferometric (MZI) sensor, we show for the first time that the sensitivity of the bimodal sensor is independent of the sensing area length. This is validated by applying the theory to an integrated plasmo-photonic bimodal sensor that comprises an aluminum (Al) plasmonic stripe waveguide co-integrated between two accessible SU-8 photonic waveguides. A series of such bimodal sensors utilizing plasmonic stripes of different lengths were numerically simulated, demonstrating bulk refractive index (RI) sensitivities around 5700 nm/RIU for all sensor variants, confirming the theoretical results. The theoretical and numerical results were also validated experimentally through chip-level RI sensing experiments on three fabricated SU-8/Al bimodal sensors with plasmonic sensing lengths of 50, 75, and 100 μm. The obtained experimental RI sensitivities were found to be very close and equal to 4464, 4386, and 4362 nm/RIU, respectively, confirming that the sensing length has no effect on the bimodal sensor sensitivity. The above outcome alleviates the design and optical loss constraints, paving the way for more compact and powerful sensors that can achieve high sensitivity values at ultra-short sensing lengths.
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An, Wei, Chao Li, Dong Wang, et al. "Flat Photonic Crystal Fiber Plasmonic Sensor for Simultaneous Measurement of Temperature and Refractive Index with High Sensitivity." Sensors 22, no. 23 (2022): 9028. http://dx.doi.org/10.3390/s22239028.
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A compact temperature-refractive index (RI) flat photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) is presented in this paper. Sensing of temperature and RI takes place in the x- and y- polarization, respectively, to avoid the sensing crossover, eliminating the need for matrix calculation. Simultaneous detection of dual parameters can be implemented by monitoring the loss spectrum of core modes in two polarizations. Compared with the reported multi-function sensors, the designed PCF sensor provides higher sensitivities for both RI and temperature detection. A maximum wavelength sensitivity of −5 nm/°C is achieved in the temperature range of −30–40 °C. An excellent optimal wavelength sensitivity of 17,000 nm/RIU is accomplished in the RI range of 1.32–1.41. The best amplitude sensitivity of RI is up to 354.39 RIU−1. The resolution of RI and temperature sensing is 5.88 × 10−6 RIU and 0.02 °C, respectively. The highest value of the figure of merit (FOM) is 216.74 RIU−1. In addition, the flat polishing area of the gold layer reduces the manufacturing difficulty. The proposed sensor has the characteristics of high sensitivity, simple structure, good fabrication repeatability, and flexible operation. It has potential in medical diagnosis, chemical inspection, and many other fields.
Dissertations / Theses on the topic "RI sensor"
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Nunes, Bruno Rios Patriarca. "Maximum lifetime broadcast problem in wireless sensor networks." Escola Politécnica / Instituto de Matemática, 2013. http://repositorio.ufba.br/ri/handle/ri/21338.
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Dissertacao de Mestrado - Bruno Rios Patriarca Nunes.pdf: 1161824 bytes, checksum: ad90a85de8a47398b1ead19074bc473d (MD5)<br>Redes de sensores sem o (RSSF) são compostas por um conjunto de dispositivos, geralmente de baixa capacidade de processamento e autonomia de energia limitada, com o objeto de coletar dados sobre a area onde foi instalada e envia-los ate as unidades de processamento chamadas de estações base. Dentre os recursos de um no sensor, pode-se considerar como um dos mais críticos a carga de bateria, ja que ela de ne em ultimo caso o tempo de vida util do no. Por conta disso, e necessario que os protocolos e aplicações otimizem o uso de energia a m de prolongar o tempo de vida do no sensor e, consequentemente, de toda a RSSF.Este trabalho dedica-se a estudar o problema da maximiza¸c˜ao do tempo de vida da
rede durante uma s´erie de opera¸c˜oes de broadcast. Para o escopo desta pesquisa, o tempo
de vida da rede de sensor ´e definido como o tempo at´e a falha do primeiro n´o por falta
de energia. H´a diversos protocolos na literatura que buscam minimizar o consumo de
energia durante a dissemina¸c˜ao de mensagens na rede, por´em neles n˜ao s˜ao considerados
aspectos como o custo de recep¸c˜ao ou a presen¸ca de links assim´etricos entre os n´os. Neste
trabalho, propomos o algoritmo DLMCA para o problema de maximiza¸c˜ao do tempo de
vida da rede. O algoritmo DLMCA baseia-se na constru¸c˜ao de arborescˆencias de custo
m´ınimo, ´e localizado e considera redes com custos de comunica¸c˜ao assim´etricos, o que ´e
especialmente importante em casos em que a RSSF ´e composta por dispositivos diferentes.
Os experimentos realizados mostraram que o DLMCA ´e mais eficiente que solu¸c˜oes alternativas
propostas na literatura. A heur´ısitca oferecida pelo DLMCA para redes est´aticas
foi levemente adaptada e o problema tamb´em foi analisado para redes m´oveis. Para estas
redes, os experimentos demonstraram que a solu¸c˜ao baseada no DLMCA tamb´em foi
superior em rela¸c˜ao a outras propostas tanto em rela¸c˜ao `a energia total gasta em cada
operação de broadcast quanto em relação ao tempo de vida da rede.
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Ribeiro, Murilo Plínio Nogueira. "Sensor de direção veicular sem-fio para sistemas de iluminação inteligente em automóveis." Universidade Federal da Bahia. Escola Politécnica/Instituto de Matemática, 2010. http://repositorio.ufba.br/ri/handle/ri/18736.
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Ribeiro MPN 2010.pdf: 2892895 bytes, checksum: 552c256bbafbfa93c2b005e1779045a7 (MD5)<br>Estudos mostram que a taxa de crescimento da demanda por sensores automotivos já é duas vezes maior que a taxa de crescimento da produção de veículo. Em 2002 o número médio de sensores instalados em um veículo era de 24, em 2007 estimava-se 40 e espera-se que em 2013 este número chegue a 70. De qualquer forma, em 2008, um veiculo de luxo já possuía mais de 100 sensores instalados dando suporte aos diversos sistemas inteligentes. Um destes sistemas, lançado em 2002, é o AFS (Adaptive Front-Lighting System). Os AFSs são sistemas que atuam nas luzes dianteiras de veículos direcionando seu facho de luz. O sistema verifica informações de velocidade e esterçamento das rodas e controla a distribuição e direção da iluminação de acordo com a necessidade do condutor. Assim como ocorre com outros lançamentos, há uma tendência que este produto seja lançado também como acessório, podendo ser montado fora das linhas de montagem. Entretanto, os sensores de esterçamento das rodas hoje disponíveis no mercado são específicos e instalados junto à barra de direção, dificultado tal flexibilidade. Existe uma demanda por sensores de esterçamento adaptável a diferentes veículos. Neste trabalho são aplicados conceitos de sensoriamento de referencial magnético através de micromáquinas ou sistemas microeletrônicos montados em chips (MENS Microelectromechanical Systems) juntamente com tecnologia de comunicação sem-fio no desenvolvimento de um sensor automotivo de esterçamento das rodas, adaptável a qualquer veículo, sem que sejam necessárias alterações nos desenhos do interior deste ou interferir de modo impactante na produtividade ou no custo das linhas de montagem automobilística, possibilitando a instalação de AFSs como acessórios.
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Serpentini, Fulvio. "Desenvolvimento e Implementação de Câmera Digital com Sensor CCD para Equipamentos de Análise Ótica - Aplicação em Espectrofotometria." Escola Politécnica / Instituto de Matemática, 2009. http://repositorio.ufba.br/ri/handle/ri/21458.
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serpentini2009.pdf: 12924209 bytes, checksum: 2f48977be81dbf0b08b3ccfa824d2703 (MD5)<br>É descrito neste trabalho o desenvolvimento completo de uma câmera digital especial para uso científico e sua aplicação em espectrofotometria. São detalhadas todas as etapas do desenvolvimento da câmera, que cobre a fundamentação teórica até o projeto de circuitos, montagem de placas de circuito impresso e desenvolvimento de softwares. A câmera desenvolvida neste trabalho foi proposta com intuito de ser inserida ao espectrofotometro construído no Laboratório de Propriedades Ópticas (LaPO) do Instituto de Física da Universidade Federal da Bahia. Este equipamento permite a mudança do método de varredura atualmente utilizado para um sistema instantâneo de aquisição, o que proporciona uma maior produtividade dos pesquisadores do LaPO. É proposto também um método para simplificacão na geração de sinais em sistemas embarcados, com possibilidade de uso em sistemas de tempo real. Experimentalmente após integração e calibração da câmera ao espectrofotometro, foram adquiridos dados que se mostraram satisfatórios aos propósitos experimentais.
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Santos, Vitor Sotero dos. "Nova Órtese Elétrica para Auxílio da Marcha Humana." Instituto de Matemática, 2017. http://repositorio.ufba.br/ri/handle/ri/24161.
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Dissertação Vitor Sotero Final.pdf: 3613877 bytes, checksum: 91a05df3e3176c9104193b10b7ba47dd (MD5)<br>A marcha humana, responsável por mover o corpo para frente, pode apresentar alterações funcionais, com parâmetros alterados como a cadência e velocidade. A diminuição de força muscular dos membros inferiores é uma das causas dessas alterações. Entre os recursos terapêuticos utilizados pelo fisioterapeuta para o fortalecimento muscular está a eletroestimulação muscular transcutânea (EMT), que consiste na aplicação terapêutica de corrente elétrica nos grupos musculares, e pode ser realizada através de uma órtese elétrica. Atualmente são poucas as opções dessas órteses elétricas no mercado, e com preços não acessíveis aos serviços de saúde. Sendo assim, este trabalho teve como objetivo projetar, desenvolver, montar e testar uma órtese elétrica, baseada na integração de um aparelho comercial, gerador de EMT, com um novo sistema de sensoriamento da marcha humana. Neste trabalho foi possível realizar o desenvolvimento de um sistema composto por uma palmilha instrumentada com sensores piezorresistivos, capaz de identificar a fase de marcha, um módulo de comando, que realiza o tratamento dos sinais dos sensores, comunicação com um software especialista e chaveamento das saídas da eletroestimulação, e um software especialista para controle da eletroestimulação. Os testes realizados mostraram que o sistema é capaz de atuar durante um ciclo de marcha, com um atraso de apenas 40 ms, sem alterar a forma de onda dos trens de pulso gerados pelo eletroestimulador. Um ensaio de fadiga mostrou que a integridade dos sensores é mantida mesmo após cinco mil ciclos de força aplicada sobre sua área sensitiva. Foi desenvolvida também uma unidade de demonstração para realizar a simulação e estudos do sistema proposto. O sistema desenvolvido mostrou-se, então, uma opção eficiente e de baixo custo para o tratamento das disfunções da marcha humana.<br>The human gait, responsible for moving the body forward, may present functional
alterations, with altered parameters such as cadence and velocity. Decreased muscle
strength of the lower limbs is one of the causes of these changes. Transcutaneous
muscular electrical stimulation (TME), which consists on the therapeutic application of
electric current in muscle groups, is one of the therapeutic resources used by the
physiotherapist for muscle strengthening, and can be performed through an electrical
orthosis. Currently, there are few options for these electrical orthoses on the market,
and with inaccessible prices to health services. Therefore, the aim of this study was to
design, develop, assemble and test an electrical orthosis based on the integration of a
commercial TME generator with a new human gait sensing system. It was possible to
accomplish the development of a system composed of an insole instrumented with four
piezoresistive sensors, capable of identifying the phase of the gait, a control module,
which does the treatment of sensor signals, communication with specialized software
and switching of the outputs of the electrical stimulation, and a specialized software to
control electrical stimulation. The tests showed that the system is able to act during a
walking cycle, with a delay of only 40 ms, without changing the waveform of the pulse
trains generated by the electrical stimulator. A fatigue test showed that the integrity of
the sensors is maintained even after fifty thousand cycles of force applied over their
sensitive area. A demonstration unit was also developed to carry out the simulation
and studies of the proposed system. The developed system proved to be an efficient
and low cost option for the treatment of human gait dysfunctions.
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Soares, Lorena Leal de Oliveira. "Determinação do início da deposição de parafina em dutos de produção e transporte de petróleo utilizando Sensor Multipontos de Temperatura (SMpT)." Escola Politécnica, 2017. http://repositorio.ufba.br/ri/handle/ri/22940.
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22. Dissertação - Lorena Leal de Oliveira Soares.pdf: 3922649 bytes, checksum: c3a999c3cf135d5b1309ec483e511eac (MD5)<br>Capes<br>Na indústria de petróleo a ocorrência da parafinação em dutos persiste como um problema a ser solucionado. Este fenômeno promove a diminuição da vazão e danos a equipamentos, determinando um consequente aumento nos custos de produção de petróleo. Baixas temperaturas no ambiente externo ao duto são os principais fatores causadores da deposição de parafina, a exemplo de águas profundas onde temperaturas reduzidas tem sido verificadas. Através do gradiente formado pela diferença de temperatura entre o centro e a superfície da tubulação por onde o petróleo flui, é possível prever o início da deposição de parafina. Para tal, foi projetado, desenvolvido e montado um sensor multipontos composto por 6 sensores RTD’s (Resistance temperature detector) do tipo PT-100. Os testes necessários para o desenvolvimento do trabalho foram feitos numa planta de parafinação do tipo flow-loop, desenvolvida pelo Laboratório de Propriedades Óticas – LaPO da UFBA. O sensor multipontos, após os testes, mostrou ser capaz de determinar o início da deposição da parafina, através da análise do perfil de gradiente de temperatura aferidos por seus PT-100, da diferença de temperatura entre um sensor referência e os demais PT-100 e da derivada dessa diferença.<br>In petroleum industry occurrence of paraffin deposition in pipe persists as a problem to be solved. The wax deposition in pipelines causes decrease of flow rate and equipment damage, determining a consequent increase in the costs of oil production. Low temperatures in the duct external environment are the main factors causing paraffin deposition, such as in deep waters, where reduced temperatures are verified. Through the gradient formed by the temperature difference between the center and the surface of the pipe through which the oil flows, it is possible to predict the beginning of paraffin deposition. In order to acomplish this objective a multipoint sensor, composed by six RTD sensors kind of PT-100 was designed, developed and assembled. The tests required for the development of the work were done in a flowloop paraffin plant, developed by the Laboratory of Optical Properties - LaPO of UFBA. The multipoint temperature sensor, after tests, showed to be able to determine the beginning of paraffin deposition, by the analysis of the temperature gradient profile measured by its PT-100.
6
Santos, André Luís Monteiro Pacheco dos. "CEManTIKA Test Creator: Um Método de Geração de Casos de Teste para Aplicativos Móveis Sensíveis ao Contexto Baseado em Modelos e Padrões de Defeitos." Instituto de Matemática, 2016. http://repositorio.ufba.br/ri/handle/ri/23391.
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andre_2016_CEAPG.pdf: 7833011 bytes, checksum: 86edf4d590dbbdf5d10fe1f966f694e4 (MD5)<br>O n´umero de aplica¸c˜oes m´oveis e sens´ıveis ao contexto aumenta a cada dia. Estas
aplica¸c˜oes precisam ser testadas para assegurar um n´ıvel adequado de qualidade. Quando
a aplica¸c˜ao m´ovel depende de informa¸c˜oes de contexto, sejam elas obtidas via sensores
f´ısicos e/ou virtuais, a complexidade e o custo relativos `a etapa de testes aumenta consideravelmente,
pois os sensores fornecem `a aplica¸c˜ao um volume maior e mais diverso
de dados em compara¸c˜ao com a inser¸c˜ao direta pelo usu´ario, como ocorre nas aplica¸c˜oes
tradicionais.
Existem abordagens que almejam a gera¸c˜ao de casos de teste com informa¸c˜oes de contexto
para estes aplicativos. Algumas delas utilizam modelos de contexto da aplica¸c˜ao
para gerar casos de teste, ou ent˜ao usam padr˜oes de eventos de contexto. Estas abordagens
possuem uma desvantagem no tipo de informa¸c˜ao que ´e gerada, cujo formato
geralmente ´e uma s´erie de dados de sensores em baixo n´ıvel, como conjuntos de coordenadas
GPS. Dados de contexto de alto n´ıvel, como a chegada, presen¸ca e sa´ıda de uma
reuni˜ao, por exemplo, n˜ao s˜ao considerados por estas abordagens.
Esta pesquisa tem como objetivo investigar como a gera¸c˜ao sistem´atica de casos de
teste com dados de contexto em alto n´ıvel de abstra¸c˜ao pode ajudar o testador de aplicativos
m´oveis. Nesta disserta¸c˜ao propomos um m´etodo (denominado CEmanTIKA Test
Creator) para gera¸c˜ao de casos de teste onde o testador confecciona de forma sistem´atica
os dados de contexto para os casos de teste. Para apoiar o testador na gera¸c˜ao dos casos
de teste, combinamos os dados de contexto obtidos nos modelos de contexto da aplica¸c˜ao
com padr˜oes de defeitos em fontes de contexto.
Para avaliar a proposta implementamos um prot´otipo dentro da ferramenta de modelagem
de contexto CEManTIKA CASE e integramos os casos de teste gerados ao
simulador de contexto Context Simulator. Realizamos um estudo emp´ırico com uma
abordagem qualitativa na qual participantes volunt´arios executaram o m´etodo proposto
em uma aplica¸c˜ao m´ovel de teste denominada NoCamInMeeting. Ao analisar os dados
obtidos, conclu´ımos que a abordagem gera casos de teste com boa cobertura, embora com
alguma redundˆancia, e tamb´em que a divis˜ao sistem´atica das tarefas para a gera¸c˜ao dos
casos de teste ajuda os testadores a poupar tempo e esfor¸co.
7
Souza, Diêgo Patric Castro de. "Integração de dados espectrais de imagens do sensor ASTER e dados aerogamaespectrométricos no mapeamento de unidades neoproterozóicas da Sub-Bacia de Campinas." Instituto de Geociências, 2017. http://repositorio.ufba.br/ri/handle/ri/26172.
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Dissertação Diego.pdf: 8492044 bytes, checksum: d625975153747a271982d0a6acb77f1b (MD5)<br>RESUMO - A área de estudo está inserida no domínio geológico da Sub-Bacia de Campinas, porção NE do
Cráton São Francisco. Este domínio de idade Neoproterozóica, apresenta na base uma unidade
siliciclástica de origem dominantemente glaciomarionha (Formação Bebedouro) e sobrejacente
a esta ocorrem unidades essencialmente marinhas (carbonáticas) pertencentes ao Grupo Una. O
objetivo deste trabalho consisitiu no mapeamenta geológico destas sequências. Para atingir o
propósito foram utilizadas metodologias de mapeamento espectral (integrando medidas
espctrorradiométricas de amostras coletadas em campo e o uso de sensores orbitais), e
mapeamento geofísico (aerogamaespectometria). Ao término da pesquisa foi possível obter os
seguintes resultados e conclusões: 1- A análise dos dados de espectrorradiometria de
reflectância para as amostras coletadas na área de estudo permitiu a caracterização espectral das
litofácies. Observações de campo, descrições petrográficas, análises químicas e classificação
dos espectros com auxílio do Software TSG, permitiram identificar e caracterizar três grupos
principais de rochas carbonáticas: calcários dolomíticos impuros (argilosos) pertencentes à
Unidade C; calcilutitos calcíticos pertencentes à Unidade B; dolomitos e dolarenitos
pertencentes à Unidade B1. 2 - O mapeamento espectral foi realizado em três etapas:
primeiramente amostrando os espectros de referência na própria imagem; a classificação
seguinte utilizou espectros de minerais (montmorilonita, calcita e dolomita), disponibilizados
pela USGS como espectros de referência; O terceiro e último processamento foi realizado
utilizando os espectros obtidos através das análises das amostras, este processamento foi o que
apresentou melhores resultados. O mapeamento espectral conseguiu mapear e discriminar as
principais zonas de ocorrências das litofácies mais representativas de cada unidade. 3 – A
interpretação dos resultados obtidos através do processamento de dados aerogeofísicos
(aerogamaespectrometria) permitiu a confecção de um mapa litogeofísico. Posteriormente foi
feita uma interpretação geológica, integrando o mapa geofísico com os dados de campo e com
os resultados do mapeamento espectral. Os dados gerados em função do canal do Potássio (K)
permitiram mapear os calcários argilosos pertencentes à Unidade C. Dololutitos e dolarenitos
pertencentes a Unidade B1 foram mapeados com auxílio dos resultados obtidos através da razão
U/Th. A imagem proveniente da razão Th/K foi a que expressou melhor a diversidade
litoestratigráfica na área de estudo. A interpretação destes dados permitiu mapear os diamictitos
da Formação Bebedouro, e os calcários argilosos pertencentes a Unidade C. Os resultados
foram integrados e compilados em um mapa geológico atualizado para a região. As Unidades
mapeadas foram geradas através de um ciclo transgressivo-regressivo em ambiente marinho.
Este ciclo é correlacionável ao primeiro ciclo evidenciado pelas Unidades C, B e B1 na Bacia de
Irecê. Entretanto não foi observada a presença das Unidades A e A1 correspondentes ao
segundo ciclo transgressivo-regressivo que recobriu a sequência anterior. Os estudos realizados
não permitiram afirmar se estas unidades não existiram ou se foram erodidas.<br>ABSTRACT - The study area is included in the geological domain of the Campinas Subbasin, NE portion of
the São Francisco Craton. This domain of Neoproterozoic age presents in the base a glaciogenic
to glacio-marine siliciclastic unit (Bebedouro Formation) overlying by carbonate units from the
Group Una. The objective of this work consisted in performing geological mapping to the
sequences of Neoproterozoic ages with application of Geophysical methods (Gamma
spectrophotometry) and Spectral mapping using tools such as digital processing of ASTER
sensor images integrated with portable spectroradiometry. At the end of the research it was
possible to verify: 1 With an image of the processing data from the K channel, it was possible to
map impure carbonates from Unit C, which contains high contents of this element. The use of
the U/Th ratio image was useful to map dolomites and dolarenites from unit B1. The image
Th/K results in a better agreement with the mapping of the Units, this reason allowed to map the
diamictites of the Bebedouro Formation as a function of the texture of the clay carbonates of
Unit C (negative anomalies); 2 - The analysis of reflectance spectroscopy data for samples
collected in the study area allowed to characterize the spectral behavior of the carbonate
lithofacies present in the study area. Based on the field observations with the petrographic
description, chemical analysis and classification of the spectra with the aid of the TSG software
were possible to identify three groups of carbonate rocks: 1 impure dolomitic limestones (clay
rich) belonging to Unit C, calcitic calcilutites with a high degree of purity belonging to Unit B,
and dolomites and dolarenites belonging to Unit B1; 3 - The analysis of spectral mapping using
as endemember the spectra of calcite and dolomite obtained by Spectrorradiometry and
resampled to ASTER SWIR range allowed with little degree of detail the differentiation of the
main outcrops of dolomite and calcitic carbonates. 4 - The spectral analysis showed that there is
small differences between calcitic and dolomitic limestones, however a greater difference was
observed between the impure limestones and the others lithotypes. 5 – As mapped units were
generated through a transgressive-regressive mega cycle in the marine environment. This cycle
is correlated to the first cycle evidenced by Units C, B and B1 in the Irecê Basin. There was no
presence of Units A and A1 corresponding to the second transgressive-regressive cycle that
covered the posterior one. The studies carried out did not establish whether these units did not
exist or were eroded.
8
Câmara, Júlio César Chaves. "Monitoramento Eletrônico da Mistura Ar / Combustível em Motores de Combustão Interna Ciclo Otto." Escola Politécnica /Instituto de Matemática, 2006. http://repositorio.ufba.br/ri/handle/ri/23031.
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Monitoramento eletrônico da mistura ar combustível em motores de combustão interna ciclo otto.pdf: 6024771 bytes, checksum: e9d1a1a7829df147cb49aa16989599de (MD5)<br>Legislações ambientais restringem as emissões dos motores de forma rígida, em especial
dos veículos automotores, o que exige dos fabricantes o desenvolvimento de tecnologias para
redução das emissões de gases, entre elas o gerenciamento eletrônico.
Os sistemas de gerenciamento de motores visam um controle preciso da relação ar
combustível admitida pelo motor e do sistema de ignição, permitindo que centelhas elétricas no
momento e potência adequados sejam descarregadas pelas velas de ignição na mistura
comprimida pelos pistões.
Para efetuar essa tarefa, os sistemas utilizam informações coletadas em diversos sensores
que vão desde temperatura do motor, posição da borboleta de aceleração e vazão de ar admitida
até quantidade de oxigênio presente nos gases de escapamento.
A principal limitação atual para a melhoria da eficiência do sistema e, por conseguinte,
torná-lo apto a novos desafios de restrição de emissão de poluentes é a ausência de uma
informação mais precisa do processo de combustão que ocorre no interior dos cilindros do
motor.
Este trabalho descreve o sistema de gerenciamento eletrônico de motores, suas
características e componentes e apresenta as soluções empregadas pela indústria para monitorar
a combustão em motores, descrevendo as tecnologias empregadas, características e desafios
encontrados.
O trabalho apresenta também os dados levantados em experimentos realizados em um
motor instrumentado, demonstrando as características do sistema de monitoramento mais usado,
através do uso de sensores de oxigênio.As informações descritas demonstram as limitações dos sistemas de monitoramento atual
e suas conseqüências ante à operação de um motor de combustão interna representativo.
9
Cajuhi, Aguinaldo Hosé. "Desenvolvimento de um sistema para sensoriamento de cargas em veículos automotores." Universidade Federal da Bahia. Escola Politécnica, 2010. http://repositorio.ufba.br/ri/handle/ri/18480.
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Aguinaldo_Jose_Cajuhi_Dissertacao_23_Abril_2010.pdf: 6692924 bytes, checksum: a017006c6e4cad2db3f9a1e8e4c76c42 (MD5)<br>Made available in DSpace on 2016-01-14T19:49:29Z (GMT). No. of bitstreams: 1
Aguinaldo_Jose_Cajuhi_Dissertacao_23_Abril_2010.pdf: 6692924 bytes, checksum: a017006c6e4cad2db3f9a1e8e4c76c42 (MD5)<br>As cargas que entram no veículo são transferidas para os demais pontos de sua estrutura através das rodas pela atuação do sistema de suspensão. Sabendo-se a magnitude dessas cargas, poderemos atuar mais efetivamente no seu controle em termos de estabilidade,conforto e segurança ao conduzir um veículo. O objetivo deste trabalho é investigar, projetar, desenvolver e aplicar um sistema de trnadutores que se adeque à medição de deslocamento de suspensões veiculares. Este sistema também deverá ser capaz de transformar a informação das cargas dinâmicas em cargas efetivas através de métodos matemáticos e a correlação dos resultados teóricos com medições efetuadas em
campo. Nesse trabalho é apresentada um método para transdução de deslocamento baseado na
deformação de strain gages (célula de carga). Como o strain gage é sensível a pequenas e quase imperceptíveis deformações, será proposto um dispositivo mecânico baseado em componentes elásticos que amplificará essa pequena variação. É também discutido o método de calibração do dispositivo proposto, onde os sinais obtidos dessas deformações são tratados e transformados em valores de deslocamento. Efetivamente espera-se aplicar os resultados deste trabalho em veículos
comerciais leves, se estendendo para caminhões e veículos de passeio.
10
Mendonça, Marcelo. "Anticorpos Monoclonais contra Listeria spp.: Produção, Caracterização e Aplicação em Métodos Diagnósticos." Universidade Federal de Pelotas, 2011. http://repositorio.ufpel.edu.br/handle/ri/1299.
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Previous issue date: 2011-12-01<br>The conventional methods used to detect the Listeria monocytogenes in foods are
laborious and expensive, requiring several days for final identification. Monoclonal
antibody (MAb) based immunoassays are highly specific and rapid to perform,
especially when MAbs are raised to conserved virulence factors in the pathogen.
Among diverse virulence factors of L. monocytogenes, the surface protein internalin
A (InlA) is one of the most well-known and characterized protein, being an excellent
target as it is highly exposed on the surface and exclusive of pathogenic species. In
this work we report the production, characterization and use of a panel of MAbs
against InlA (2D12, 3B7, 4E4), and a MAb (3F8) which specifically recognizes all
bacteria belonging the genus Listeria. MAbs were produced by the immunization of
BALB/c mice with a recombinant InlA together with heat killed L. monocytogenes.
The MAbs produced showed excellent reativities by indirect ELISA, Western blot and
immunofluorescence. A Cy5 conjugated anti-InlA MAb-2D12 was used as detection
antibody for L. monocytogenes in a sandwich-like fiber optic immunoassay. Using
MAb-2D12 as capture antibody on the waveguides, the limit of detection was ~3 x
102 CFU.mL-1, and when MAb-3F8 was used for capture the limit of detection was ~1
x 105 CFU.mL-1. Furthermore, MAbs 2D12 and 3F8 were used to coat paramagnetic
beads and tested in the immunomagnetic separation (IMS) of L. monocytogenes from
pure cultures, and artificially contaminated cheeses and hotdogs. After IMS capture,
bacteria were released from the beads, used in the fiber optic assay or plated on
agar for counting. In parallel, the capture of L. monocytogenes was confirmed by
real-time qPCR and light-scattering technology (BARDOT). Using IMS to concentrate
and separate L. monocytogenes, followed by a fiber optic platform, it was possible to
detect in less than 22 h, approximately 40 CFU/g of L. monocytogenesi, even in the
presence of L. innocua in cheese and hot dogs artificially contaminated. In addition,
using mass spectrometry (MALDI-TOF-MS) the protein to which MAb-3F8 binds, was
identified as fructose 1,6-bisphosphate aldolase (FBA). The results presented in this
work indicate that using both systems together, the IMS and fiber optic
immunosensor, were more reliable and faster, and could be applied in the routinely
for detection of L. monocytogenes in food. Moreover, both MAbs have the potential to
useful in others biosensor platforms, as well as in other detection and functionality
immunoassays for InlA and FBA in Listeria.<br>Os métodos convencionais empregados para detecção de Listeria monocytogenes
em alimentos são laboriosos e onerosos, requerendo vários dias para sua
identificação final. A utilização de anticorpos monoclonais (MAbs) em imunoensaios
para detecção rápida de bactérias tem como vantagem a alta especificidade e
rapidez, principalmente quando direcionados para fatores de virulência conservados.
Dentre os diversos fatores de virulência de Listeria, a proteína de membrana
internalina A (InlA), é umas das mais bem caracterizadas, sendo um excelente alvo
por ser altamente exposta na superfície e exclusiva de espécies patogênicas. Neste
trabalho é relatado a produção, caracterização e utilização em métodos de
diagnósticos de um painel de MAbs contra a InlA (2D12, 3B7, 4E4), e de um MAb
(3F8) que reconhece especificamente todas as bactérias do gênero Listeria. Na
produção dos MAbs, camundongos BALB/c foram imunizados com uma proteína
recombinante InlA (rInlA) concomitantemente com L. monocytogenes inativadas por
fervura. Os MAbs gerados demonstraram excelente reatividade por ELISA indireto,
Western blot e imunofluorescência. O MAb anti-InlA 2D12 marcado com Cy5 foi
usado como anticorpo de detecção de L. monocytogenes, no sistema tipo sanduíche
de sensor de fibra óptica. Usando MAb-2D12 como anticorpo de captura nas fibras
ópticas, obteve-se um limite de detecção de ~3 x 102 CFU.mL-1, e um limite de
detecção de ~1 x 105 CFU.mL-1 foi visualizado com MAb-3F8 como captura. Os
MAbs anti-InlA 2D12 e anti-Listeria 3F8 foram posteriormente utilizados para
sensibilizar esferas paramagnéticas e testados na separação imunomagnética (IMS)
de L. monocytogenes em culturas puras, e em queijo e salsichas tipo hotdog
artificialmente contaminados. Após a captura por IMS, as bactérias foram liberadas,
incubadas com a fibra óptica ou plaqueadas em agares para contagem. Em paralelo,
a confirmação da captura de L. monocytogenes foi realizada por PCR quantitativo
em tempo real e por light-scattering technology (BARDOT). Utilizando IMS para
separar e concentrar L. monocytogenes, seguido da utilização em plataforma de
fibra óptica, foi possível realizar a detecção em menos de 22 horas, de
aproximadamente 40 UFC/g de L. monocytogenes em presença de L. innocua, em
queijo e salsicha artificialmente contaminados. Além disso, a proteína alvo do MAb3F8
foi identificado como frutose 1,6-bifosfato aldolase através de espectrometria de
massa (MALDI-TOF-MS). Os resultados obtidos nesse trabalho indicam que a
utilização em conjunto dos sistemas de IMS e fibra óptica com os MAb-2D12 e MAb3F8,
foram confiáveis e rápidos, e assim, podendo ser empregados em
imunoensaios de rotina para detecção de L. monocytogenes em alimentos. Contudo,
ambos MAbs possuem ainda grande potencial para serem mais explorados em
outras plataformas de biossensores, assim como, em outros imunoensaios de
detecção e funcionalidade de InlA e FBA em Listeria
Books on the topic "RI sensor"
1
George C. Marshall Space Flight Center., ed. Non-intrusive speed sensor: NAS8-34658, final report, phase II, RI/RD 85-283. Rockwell International Corporation, 1986.
Find full text
3
Torlone, Francesca, ed. Il diritto al risarcimento educativo dei detenuti. Firenze University Press, 2016. http://dx.doi.org/10.36253/978-88-6655-926-9.
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L’esecuzione della pena in ottica (ri)educativa è tema assai dibattuto attraverso approcci anche multidisciplinari. In questo volume esso è affrontato in chiave risarcitoria, ovvero attraverso il riconoscimento della necessità di predisporre dispositivi educativi di contrasto alle ‘azioni educative avverse’, cui può essere esposta la popolazione detenuta all’interno di contesti penitenziari, ed al fenomeno della recidiva. Oltre agli elementi del programma trattamentale (strutturato, intenzionale, normato e proceduralizzato), ogni momento di espiazione della pena – anche quelle taken for granted – ha in sé una valenza educativa e si presenta come opportunità di crescita e miglioramento per ciascun detenuto. Il volume raccoglie una serie di contributi da professionisti del sistema penale a testimonianza della varietà di esperienze, con senso educativo, che supportano i processi di cambiamento dei detenuti.
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Augieri, Carlo A. Sul senso affabulante: Pasolini, la letteratura e la ri-simbolizzazione orizzontale della storia. Milella, 2001.
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Augieri, Carlo Alberto. Sul senso affabulante: Pasolini, la letteratura e la ri-simbolizzazione 'orizzontale' della storia. Milella, 2001.
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United States. Congress. House. Select Committee on Aging. Senior health care in the 1980's: Who will pay? : hearing before the Select Committee on Aging, House of Representatives, Ninety-eighth Congress, second session, April 9, 1984, Warwick, RI. U.S. G.P.O., 1985.
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Non-intrusive speed sensor: NAS8-34658, final report, phase II, RI/RD 85-283. Rockwell International Corporation, 1986.
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Yamaguchi, Yoshiko. Senso to heiwa to uta: Ri Koran kokoro no michi. Tokyo Shinbun Shuppankyoku, 1993.
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Sul senso affabulante: Pasolini, la letteratura e la ri-simbolizzazione "orizzontale" della storia. Milella, 2001.
Find full textBook chapters on the topic "RI sensor"
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Singh, Shivam, Akash Srivastava, Sanat Kumar Pandey, and Y. K. Prajapati. "Single-Side-Polished Gold-Coated SPR-Based PCF RI Sensor." In Lecture Notes in Electrical Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2761-3_28.
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Miao, Chunyu, Guoyong Dai, Keji Mao, Yidong Li, and Qingzhang Chen. "RI-MDS: Multidimensional Scaling Iterative Localization Algorithm Using RSSI in Wireless Sensor Networks." In Communications in Computer and Information Science. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46981-1_16.
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Henna, Shagufta. "SA-RI-MAC: Sender-Assisted Receiver-Initiated Asynchronous Duty Cycle MAC Protocol for Dynamic Traffic Loads in Wireless Sensor Networks." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29479-2_10.
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Yang Xian-hui, Yang Rui, Gao Shuo, Gu Xue-mei, Yu Bo-tao, and Zhang Shi-chuan. "S-Fiber Probe for Refraction Index Sensing." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2017. https://doi.org/10.3233/978-1-61499-828-0-357.
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A refractive index (RI) sensor which based on an S-tapered fiber probe (STFP) with a silver mirror on its end facet is demonstrated. The fiber probe has a compact size of about 1 mm, making it proper for sensing in narrow or limited space. It is stiff to bend due to the short probe structure, leading to avoid the cross-sensitivity of bending. The reflection spectra of the STFPs with different structure length have been analyzed and simulated. A proper structure length will result in narrow dips and peaks, which can be used to enhance the measurement accuracy. Its refractive index sensitivity which is normally in the range of 1.332~1.387 reaches 268.8 nm/RI unit, which is 9 times higher than that of the existing reflective fiber-taper-based RI sensor. Furthermore, the thermal response experimental results show that the STFP is temperature insensitive.
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"medium Access Control l ayer for Underwater Sensor Networks ...... yANPiNg Z h ANg , yANg X i Ao , m iN Ch EN, PRAVEER BAh Ri,." In Underwater Acoustic Sensor Networks. Auerbach Publications, 2010. http://dx.doi.org/10.1201/9781420067125-17.
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"Antireplay Protocols for Sensor Networks Mohamed G. Gouda, Young-ri Choi, and Anish Arora." In Handbook on Theoretical and Algorithmic Aspects of Sensor, Ad Hoc Wireless, and Peer-to-Peer Networks. Auerbach Publications, 2005. http://dx.doi.org/10.1201/9780203323687-39.
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"6aPnhdotM or oelfe ra ccutliavreMEa ff teec ri tailns Polymeric." In Optical Sensors and Switches. CRC Press, 2001. http://dx.doi.org/10.1201/9781482294620-23.
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Terho Mikko. "Practical Approach to Real Time Contextual Data Access." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2013. https://doi.org/10.3233/978-1-61499-177-9-328.
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In this paper, we explain one approach for a real-time solution in a mobile device, which would automatically sense and respond to the context of the consumer. This approach uses bag of words to record the state and context of the device. Using the Experience Matrix device will predict the next states, without a use of a schema, processing of bags of words using the Random Index (RI) algorithm. The index forms an associative storage of data that conveys proper data instruction pairs for the next steps or states. It turned out that this was also a very effective approach to provide real time response and almost static storage requirements. Moreover there was no need for training sequences for learning and recording the context. In this article we explain the overall solution architecture, where a dictionary is the model of the world. The context is specialized by inserting the information from mobile sensors to a bag of words, which is used to record and predict events on the mobile device. The Random Index algorithm is used to recall similar events from past. After recall the consumer is selecting an individual way to continue processing from predicted choices and a new state is entered. We would say that this new approach is a base for activity based computing that could potentially replace current application based paradigm in mobile communication devices. As an example we have implemented a predictive browser that uses the event matrix to predict next pages to be navigated into.
Conference papers on the topic "RI sensor"
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Yusran, Nur Fatima, L. S. Supian, Chew Sue Ping, Norhana Arsad, Nani Fadzlina Naim, and Noor Hamisah Mohd Sahroni. "Oil Assessment using POF-based RI-Sensor." In 2024 IEEE 22nd Student Conference on Research and Development (SCOReD). IEEE, 2024. https://doi.org/10.1109/scored64708.2024.10872678.
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Higaki, M., S. Miyamura, S. Taue, et al. "Enhanced Sensitivity of Refractive-Index-Sensing Optical Comb by Frequency Multiplication based on THz Comb." In CLEO: Science and Innovations. Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_si.2024.sm1g.6.
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Refractive-index-sensing optical comb is capable of RF-reading high-precision refractive index (RI) measurements. To amplify the RI-dependent frequency shift, we report a method for frequency multiplication of the RF sensor signal based on THz comb.
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Vardhan, Shalini, Naveen Kumar Gupta, Aditya Kushwaha, Priyanka Verma, and Ritu Raj Singh. "Modelling of CO2 Gas Sensing using Spectral Envelope of SoI Integrated Racetrack Resonator." In JSAP-Optica Joint Symposia. Optica Publishing Group, 2024. https://doi.org/10.1364/jsapo.2024.17p_a25_4.
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Silicon on Insulator (SoI) technology has tantalized the photonics world in terms of integrated device modeling encountering with numerous applications. Many gas sensors can be designed using SoI technique with lower scaling factor and higher operational speed [1]. The emission of Carbon dioxide is a natural process but excess emisson is a result of burning of fossil fuels, deforestation, increase in the use of automobiles [2]. People who work in automobile industries more likely face the respiratory problems, dizziness etc. To address these issues a gas sensor is designed to detect the excess of emitted CO2. In this manuscript an approach to sense CO2 gas using microring racetrack resonator is demonstrated. The sensing analysis is done on the basis of change in the refractive index (RI) in the cavity region which will result in the envelope spectrum shift.
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Kihara, Mitsuru, Yuma Akita, Naoaki Abe, and Ryoki Soeda. "Transmission-loss characteristics of microfiber in liquids for multimode interference sensors." In 3D Image Acquisition and Display: Technology, Perception and Applications. Optica Publishing Group, 2024. http://dx.doi.org/10.1364/3d.2024.jm4a.5.
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Experimental results indicate that microfibers can be effective as multimode interference sensors for measuring refractive indices (RIs) below 1.45. The RI is linearly proportional to measured wavelength shift, and the slope is 901.5 nm/RIU.
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Seki, K., H. Koresawa, E. Hase, et al. "Beam-Angle-Scanning Surface Plasmon Resonance Sensor." In 3D Image Acquisition and Display: Technology, Perception and Applications. Optica Publishing Group, 2022. http://dx.doi.org/10.1364/3d.2022.jtu2a.6.
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We demonstrate a beam-angle-scanning SPR using a combined galvanometer mirror and relay lens optics. RI resolution of 2.306×10-5 RIU and RI accuracy of 8.984×10-5 RIU were achieved at a data acquisition rate of 100 Hz.
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Elizarov, Maxim S., and Andrea Fratalocchi. "Compact sensor based on inversely designed ultrahigh RI metamaterial." In Novel Optical Materials and Applications. Optica Publishing Group, 2022. http://dx.doi.org/10.1364/noma.2022.noth2d.2.
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We propose optical RI sensor with sensitivity of 350 nm/RIU for the micrometer footprint. It is based on artificial material which can emulate non-dispersive ultra-high refractive index (n ≈ 100) by geometrical deformation of reflective substrate.
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Elizarov, Maxim, and Andrea Fratalocchi. "Compact sensor based on inversely designed ultrahigh RI metamaterial." In Physics and Simulation of Optoelectronic Devices XXXI, edited by Marek Osiński, Yasuhiko Arakawa, and Bernd Witzigmann. SPIE, 2023. http://dx.doi.org/10.1117/12.2650086.
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Fasseaux, Hadrien, Médéric Loyez, and Christophe Caucheteur. "Machine Learning approach for fiber-based biosensor." In Optical Fiber Sensors. Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofs.2023.w4.4.
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Common fiber-based biosensors demodulations quantify refractive index (RI) changes occurring for analyte-receptor bindings through wavelength changes. We use a machine learning model to quantify evolutions in RI unit without having to measure the sensor sensitivity.
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Singh, Brajraj, Manisha Yadav, Divya Kanwar Shekhawat, Mohit Sharma, and Manoj Mishra. "Plasmonic Ring-Resonator-Based Infrared Sensor for RI Change Detection." In Frontiers in Optics. Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jtu4b.36.
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A compact MIM Plasmonic ring-resonator sensor with a tunnel is investigated using various organic/non-organic analytes for RI detection in the near-infrared region and maximum sensitivity is reported to be 534 nm/RIU at tunnel angle 65o.
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Kim, Taeyoon, Junha Jung, Geun Weon Lim, and Ju Han Lee. "Temperature-insensitive measurement of refractive index using a no-core fiber-based modal interferometer." In Conference on Lasers and Electro-Optics/Pacific Rim. Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.p_ctu17_05.
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We demonstrate a temperature-insensitive refractive index (RI) sensor based on an SMF-NCF-SMF structure-based modal interferometer with a wave configuration. The RI measurement sensitivity of our proposed refractometer was ~-53.24nm/RIU with no temperature sensitivity (0 pm/°C).
Reports on the topic "RI sensor"
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Bigorre, Sebastien P., and Raymond Graham. The Northwest Tropical Atlantic Station (NTAS): NTAS-20 Mooring Turnaround Cruise Report Cruise On Board RV Pisces November 4-28, 2021 Newport, RI - Pascagoula, MS. Woods Hole Oceanographic Institution, 2023. http://dx.doi.org/10.1575/1912/29647.
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The Northwest Tropical Atlantic Station (NTAS) was established to address the need for accurate air-sea flux estimates and upper ocean measurements in a region with strong sea surface temperature anomalies and the likelihood of significant local air–sea interaction on interannual to decadal timescales. The approach is to maintain a surface mooring outfitted for meteorological and oceanographic measurements at a site near 15°N, 51°W by successive mooring turnarounds. These observations are used to investigate air–sea interaction processes related to climate variability. The NTAS Ocean Reference Station (ORS NTAS) is supported by the National Oceanic and Atmospheric Administration’s (NOAA) Global Ocean Monitoring and Observing (GOMO) Program (formerly Ocean Observing and Monitoring Division). This report documents recovery of the NTAS-19 mooring and deployment of the NTAS-20 mooring at the same site. Both moorings used Surlyn foam buoys as the surface element. These buoys were outfitted with two Air–Sea Interaction Meteorology (ASIMET) systems. Each system measures, records, and transmits via satellite the surface meteorological variables necessary to compute air–sea fluxes of heat, moisture and momentum. The upper 160 m of the mooring line were outfitted with oceanographic sensors for the measurement of temperature, salinity and velocity. The mooring turnaround was done by the Upper Ocean Processes Group of the Woods Hole Oceanographic Institution (WHOI), onboard R/V Pisces, Cruise PC-21-07. The cruise took place from November 4 to 28, 2021. The NTAS-20 mooring was deployed on November 12, and the NTAS-19 mooring was recovered on November 13. Limited inter-comparison between ship and buoys were performed on this cruise. This report describes these operations and the pre-cruise buoy preparations. Other operations during PC-21-07 consisted of one CTD cast near the Meridional Overturning Variability Experiment (MOVE) subsurface mooring array MOVE 1-14. MOVE is designed to monitor the integrated deep meridional flow in the tropical North Atlantic.
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Anderson, Gerald L., and Kalman Peleg. Precision Cropping by Remotely Sensed Prorotype Plots and Calibration in the Complex Domain. United States Department of Agriculture, 2002. http://dx.doi.org/10.32747/2002.7585193.bard.
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This research report describes a methodology whereby multi-spectral and hyperspectral imagery from remote sensing, is used for deriving predicted field maps of selected plant growth attributes which are required for precision cropping. A major task in precision cropping is to establish areas of the field that differ from the rest of the field and share a common characteristic. Yield distribution f maps can be prepared by yield monitors, which are available for some harvester types. Other field attributes of interest in precision cropping, e.g. soil properties, leaf Nitrate, biomass etc. are obtained by manual sampling of the filed in a grid pattern. Maps of various field attributes are then prepared from these samples by the "Inverse Distance" interpolation method or by Kriging. An improved interpolation method was developed which is based on minimizing the overall curvature of the resulting map. Such maps are the ground truth reference, used for training the algorithm that generates the predicted field maps from remote sensing imagery. Both the reference and the predicted maps are stratified into "Prototype Plots", e.g. 15xl5 blocks of 2m pixels whereby the block size is 30x30m. This averaging reduces the datasets to manageable size and significantly improves the typically poor repeatability of remote sensing imaging systems. In the first two years of the project we used the Normalized Difference Vegetation Index (NDVI), for generating predicted yield maps of sugar beets and com. The NDVI was computed from image cubes of three spectral bands, generated by an optically filtered three camera video imaging system. A two dimensional FFT based regression model Y=f(X), was used wherein Y was the reference map and X=NDVI was the predictor. The FFT regression method applies the "Wavelet Based", "Pixel Block" and "Image Rotation" transforms to the reference and remote images, prior to the Fast - Fourier Transform (FFT) Regression method with the "Phase Lock" option. A complex domain based map Yfft is derived by least squares minimization between the amplitude matrices of X and Y, via the 2D FFT. For one time predictions, the phase matrix of Y is combined with the amplitude matrix ofYfft, whereby an improved predicted map Yplock is formed. Usually, the residuals of Y plock versus Y are about half of the values of Yfft versus Y. For long term predictions, the phase matrix of a "field mask" is combined with the amplitude matrices of the reference image Y and the predicted image Yfft. The field mask is a binary image of a pre-selected region of interest in X and Y. The resultant maps Ypref and Ypred aremodified versions of Y and Yfft respectively. The residuals of Ypred versus Ypref are even lower than the residuals of Yplock versus Y. The maps, Ypref and Ypred represent a close consensus of two independent imaging methods which "view" the same target. In the last two years of the project our remote sensing capability was expanded by addition of a CASI II airborne hyperspectral imaging system and an ASD hyperspectral radiometer. Unfortunately, the cross-noice and poor repeatability problem we had in multi-spectral imaging was exasperated in hyperspectral imaging. We have been able to overcome this problem by over-flying each field twice in rapid succession and developing the Repeatability Index (RI). The RI quantifies the repeatability of each spectral band in the hyperspectral image cube. Thereby, it is possible to select the bands of higher repeatability for inclusion in the prediction model while bands of low repeatability are excluded. Further segregation of high and low repeatability bands takes place in the prediction model algorithm, which is based on a combination of a "Genetic Algorithm" and Partial Least Squares", (PLS-GA). In summary, modus operandi was developed, for deriving important plant growth attribute maps (yield, leaf nitrate, biomass and sugar percent in beets), from remote sensing imagery, with sufficient accuracy for precision cropping applications. This achievement is remarkable, given the inherently high cross-noice between the reference and remote imagery as well as the highly non-repeatable nature of remote sensing systems. The above methodologies may be readily adopted by commercial companies, which specialize in proving remotely sensed data to farmers.
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Butler, Nadia, and Soha Karam. Key Considerations for Integrating COVID-19 Vaccination Services: Insights from Iraq and Syria for the MENA Region. SSHAP, 2022. http://dx.doi.org/10.19088/sshap.2022.034.
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With the COVID-19 pandemic well into its third year, governments and response partners are recognising that it no longer makes sense for COVID-19 services, including vaccination, to exist in isolation. There is growing recognition of the potential for integration with other services as the way forward for COVID-19 vaccination. This has recently begun to occur in various countries, but until now, there has been little evidence available as to the success of these initiatives. Service delivery integration occurs where “managerial or operational changes to health systems bring together inputs, delivery, management, and organisation of particular service functions in ways that are contextually appropriate and person-centred with the aim of improving coverage, access, quality, acceptability, effectiveness, and cost-effectiveness” (Haldane et al. 2022) This brief draws on evidence from academic and grey literature and consultations with partners working in the COVID-19 response to review current integration efforts (as of August 2022) and explore potentially effective ways to integrate COVID-19 vaccination into other services in the Middle East and North Africa (MENA) region. Recent guidance on integration from WHO has also been cross-referenced where relevant. Iraq is taken as a detailed case study due to the efforts already made there on integration of COVID-19 and routine immunisation (RI) services. Global integration experiences and a brief discussion of integration efforts in Syria are also included. The brief is part of the Social Science in Humanitarian Action Platform (SSHAP) series on social science considerations relating to COVID-19 vaccines and was written for SSHAP by Nadia Butler supported by Soha Karam (Anthrologica). Verbal consultations and reviews of the draft were provided from response partners in Iraq and other locations within the region (IFRC MENARO, Iraq MoH, UNICEF Iraq, UNICEF MENARO, UNICEF Syria, WHO EMRO). The brief was requested by the UNICEF Middle East and North Africa Regional Office (MENARO) and is the responsibility of SSHAP.