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- 2018
- imgae sensor
- internet of things
- drone
- visible light ID
- Signal-to-Noise Ratio (SNR)
- Infinite Gain Multiple Feedback (IGMF)
- Visible Light Communications (VLC)
- LED
- Trans-Impedance Amplifier (TIA)
- Optoelectronic Information Science and Engineering
- Tohoku University
- University of Northumbria
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Ultrafast Epoxy–Amine Photopolyaddition
摘要： A new generation of light-induced production of polymeric materials is presented here. In detail, we propose to use photoacidic catalysis during the well-known epoxy?amine polyaddition reaction: it is now referred to as “epoxy?amine photopolyaddition”. Soft irradiation (405 nm visible light, 150?450 mW/cm2) of a photosensitizer/iodonium salt system leads to the production of superacids (e.g., H+, PF6?) that spectacularly enhance state-of-the-art epoxy?amine polyaddition kinetics: <3 min is necessary to obtain full conversion when >3 h is required to complete the reaction without light. Also, photoactivation greatly enhances final epoxy and amine conversions which resulted in increases (+15 °C) of the glass transition temperature of the final 3D polymer networks. This work clearly shows the extremely versatile applications for epoxy?amine photopolyaddition: thin layers (40 μm), thick layers (up to 2.5 cm), and composites (45 wt % fillers). This work paves the path toward ultrafast production of epoxy?amine composites and adhesives.
关键词： composites,photoacidic catalysis,visible light,superacids,polymer networks,epoxy?amine photopolyaddition,adhesives
更新于2025-09-09 09:28:46
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Plasma emission correction in reflectivity spectroscopy during sputtering deposition
摘要： Surface di?erential re?ectivity spectroscopy is a fast non-destructive in situ and real-time measurement technique which allows following the ?rst stages of thin ?lm deposition. However, when applied to sputtering technique, spectra can strongly be distorted by residual light coming from plasma in a way, as shown herein, that depends on sample re?ectivity. Thanks to suitable measurements, before and after growth with and without plasma or illumination lights, a protocol of signal correction is proposed to get rid of the spurious plasma contribution. The interest of the method is illustrated in the case of silver deposition on a silicon substrate.
关键词： sputtering deposition,Surface Di?erential Re?ectivity Spectroscopy,UV-visible
更新于2025-09-09 09:28:46
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AIP Conference Proceedings [Author(s) 2ND INTERNATIONAL CONFERENCE ON CHEMISTRY, CHEMICAL PROCESS AND ENGINEERING (IC3PE) - Yogyakarta, Indonesia (14 August 2018)] - Validation on analysis method for phosphorus in solid inorganic fertilizer using UV-visible spectrophotometry
摘要： Determination of performance and uncertainty parameters from P2O5 analysis in inorganic fertilizer conducted by spectrophotometric UV-Visible has been done. This method was conducted in three stages those were preparation, testing and data processing. In the preparation stage, standard solution and reagent solution was made and for the testing stage, phosphorus standard and P2O5 samples were taken from inorganic fertilizer with linearity, precision (repeatability), accuracy (% recovery), limit of detection and limit of quantitation as variable analysis. The stage of data processing, the obtained results were processed statistically and compared with the acceptance requirements set by standard method. The coefficient determination (R2), precision, and accuracy respectively were 0.9999, 0.174%, and 100.58%, meanwhile LOD and LOQ were 1.653 mg/L and 5.508 mg/L. Based on the results can be concluded that the method analysis of P2O5 using spectrophotometry UV-Visible expressed good validity and can be applied as routine method at laboratory.
关键词： UV-Visible spectrophotometry,inorganic fertilizer,phosphorus,validation,P2O5
更新于2025-09-09 09:28:46
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Generation of enhanced information image using curvelet-transform-based image fusion for improving situation awareness of observer during surveillance
摘要： Image fusion has been widely used to combine multispectral information into an enhanced information image. The application of such enhanced information content in the field of surveillance for improving situation awareness of observer is highly recommended. When a single sensor information is used for surveillance like visible camera output during poor ambient lighting conditions, ‘hot-target’ details are not visible to the observer. The use of visible-infrared fused image is recommended during surveillance in poor ambient lighting conditions to visualise background scene details and ‘hot-target’ details simultaneously. A wrapping-based curvelet transform method is proposed for fusion of infrared and visible images. Curvelet transform is used because of its advantages over wavelet transform limitations like directional insensitivity, isotropic basis and inability to resolve curves. The approximation coefficients are fused using the principal component analysis rule while detailed coefficients are fused using absolute maximum rule. The reconstructed fused image is compared with results of other fusion approaches proposed in literature. The performance of proposed wrapping-based curvelet fusion method is found visually and statistically better in comparison to other fused image outputs. The fused image obtained using proposed method retains background details as well as hot target presence with fidelity.
关键词： Curvelet transform,infrared image,situation awareness,visible image,principal component analysis,image fusion
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Nara, Japan (2018.10.9-2018.10.12)] 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - About Lighting Level of the Visible Light Communication.
摘要： In visible light communication in which information is superimposed on light, its communication range is visible. On the other hand, when the modulation that brightness is changed according to information is used, it is not good for the human eye because human feels flicker for the changed brightness. In this paper, we propose a novel modulation that can vary the brightness other than 1/4 or 3/4 by combining these pulse position modulation and inverted pulse position modulation. We have two experiments; one is the evaluation for visual flicker by human eye and the other is its communication performance.
关键词： Visible Light Communication,lighting control,wireless communication
更新于2025-09-09 09:28:46
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Joint Encoding LBP Features from Infrared and Visible-Light Cloud Image Observations for Ground-Based Cloud Classification
摘要： Cloud type classification based on ground-based cloud image observations is an important task in atmospheric research. Currently, two kinds of cloud image observations with infrared and visible light images are widely used for cloud classification. However, they are only independently analyzed and simply compared in the current study. The useful information from these two kinds of images is not fully utilized and integrated. The classification performance could be improved if taking full advantage of the complementary information of these two observations. Thus, first, a database containing these two kinds of cloud images with same temporal resolution is released in this study. Then, a two-observation joint encoding strategy of LBP (local binary pattern) features is proposed to implement cloud classification by encoding the joint distribution of LBP patterns in different observations, which captures the correlation between two observations. Experimental results based on this database show the significant superiority of the proposed method compared to the results based on the single observation.
关键词： infrared cloud images,cloud classification,Local binary patterns,visible light,joint distribution
更新于2025-09-09 09:28:46
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New Algorithms for Energy-Efficient VLC Networks with User-Centric Cell Formation
摘要： The ever-increasing demand in high data rate has pushed the attention of the researchers to utilize the unregulated visible light spectrum for communication. This paper proposes a joint access-point (AP) association and power allocation algorithms for energy-ef?ciency (EE) maximization in visible light communication (VLC) networks. Based on the user-centric (UC) design, we ?rst show that the cell formation and power allocation are interlinked problems and should be treated jointly. We start by proposing a new algorithm for users’ clustering and then associating all the APs to the clustered users based on a proposed metric. We then propose two algorithms that jointly allocate the power, under quality-of-service (QoS) constraints, and decide which APs must be prevented from participating in communication. The ?rst algorithm is designed to maximize the EE, while the other algorithm is designed to reduce the complexity of the ?rst algorithm with acceptable degradation in the EE. Different from the related literature that allocated the power with the worst case interference information, we propose an iterative algorithm that allocates the power based on exact interference information, which signi?cantly improves the EE. The numerical results demonstrate that the proposed algorithms signi?cantly improve the EE compared to the existing work.
关键词： power allocation,energy ef?ciency,Visible light communication,user clustering
更新于2025-09-09 09:28:46
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Sb <sub/>2</sub> O <sub/>3</sub> /Sb <sub/>2</sub> S <sub/>3</sub> Heterojunction Composite Thin Film Photoanode Prepared via Chemical Bath Deposition and Post-Sulfidation
摘要： Novel visible-light-driven Sb2O3/Sb2S3 photoelectrodes were synthesized via chemical bath deposition and post-sul?dation. An enhanced photocurrent density of 0.35 mA/cm2 at 1.23 V vs. RHE under simulated sunlight was achieved, compared to 0.008 mA/cm2 at 1.23 V vs. RHE for pure Sb2O3. The great improvement in the photoelectrochemical (PEC) performance bene?ts from the enhanced light absorbance and charge transfer ef?ciency attributable to the combination of Sb2S3. The Sb2O3/Sb2S3 heterojunction strategy shows potential for visible-light-driven photoelectrochemical water splitting.
关键词： heterojunction,photoelectrochemical,Sb2O3/Sb2S3,visible-light-driven,water splitting
更新于2025-09-09 09:28:46
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Effect of Temperature on Shape & Optical Properties of MgO/ZnO Nanocomposites
摘要： MgO/ZnO nanocomposites were synthesized by mixing magnesium acetate tetrahydrate and zinc acetate in the equimolar ratio through a simple reflux method. The refluxed sample was annealed at three different temperatures 400, 500 and 600 oC, respectively. X-ray diffraction spectra (XRD) showed wurtzite ZnO structure with cubic MgO. The HR-SEM picture showed the rod shaped morphology at 400 °C and morphology changed to spherical shape with the increase in temperature to 600 °C. Williamson-Hall plot is used to study the particle size and micro strain of the synthesized MgO/ZnO nanocomposites. The band gap and luminescent property were investigated using ultra violet-visible and photoluminescence spectra. The optical property of MgO/ZnO nanocomposites depends on the annealing temperature which is shown by the increase in the band gap as temperature increases.
关键词： MgO-ZnO nanocomposites,EDAX,Ultra violet-visible,Photoluminescence,HRSEM
更新于2025-09-09 09:28:46
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Impact of Overlapping Fe/TiO <sub/>2</sub> Prepared by Sol-Gel and Dip-Coating Process on CO <sub/>2</sub> Reduction
摘要： Fe-doped TiO2 (Fe/TiO2) film photocatalyst was prepared by sol-gel and dip-coating process to extend its photoresponsivity to the visible spectrum. To promote the CO2 reduction performance with the photocatalyst, some types of base materials used for coating Fe/TiO2, which were netlike glass fiber and Cu disc, were investigated. The characterization of prepared Fe/TiO2 film coated on netlike glass fiber and Cu disc was analyzed by SEM and EPMA. In addition, the CO2 reduction performance of Fe/TiO2 film coated on netlike glass disc, Cu disc, and their overlap was tested under a Xe lamp with or without ultraviolet (UV) light, respectively. The results show that the concentration of produced CO increases by Fe doping irrespective of base material used under the illumination condition with UV light as well as that without UV light. Since the electron transfer between two overlapped photocatalysts is promoted, the peak concentration of CO for the Fe/TiO2 double overlapping is approximately 1.5 times as large as the Fe/TiO2 single overlapping under the illumination condition with UV light, while the promotion ratio is approximately 1.1 times under that without UV light.
关键词： UV light,Fe-doped TiO2,visible spectrum,photocatalyst,dip-coating,sol-gel,CO2 reduction
更新于2025-09-09 09:28:46