Relevant bibliographies by topics / Grid of optical frequencies

Academic literature on the topic 'Grid of optical frequencies'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Grid of optical frequencies"

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Mizuno, T., M. Oguma, T. Kitoh, Y. Inoue, and H. Takahashi. "Mach-Zehnder interferometer exactly aligned with ITU grid frequencies." IEEE Photonics Technology Letters 18, no. 2 (January 2006): 325–27. http://dx.doi.org/10.1109/lpt.2005.861980.

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HORING, N. J. M., S. Y. LIU, V. V. POPOV, and H. L. CUI. "TUNABLE GRID GATED DOUBLE-QUANTUM-WELL FET TERAHERTZ DETECTOR." International Journal of High Speed Electronics and Systems 18, no. 01 (March 2008): 147–57. http://dx.doi.org/10.1142/s0129156408005229.

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Several aspects of the theory of plasmon resonant DC photoconduction are discussed here, in connection with recent observations involving a THz-irradiated grid-gated double-quantum-well FET.1 In this, we construct a classical model of nonlinear polarizability to second order in the THz field using a “hydrodynamic” type formulation including the roles of a stress-tensor and friction/viscosity. The resulting second order polarizability exhibits resonant behavior when the THz frequency matches plasmon frequencies of the system, sharply reducing the effectiveness of screened impurity scattering potentials which can admit resonant DC photoconduction. Furthermore, we also show that an asymmetric double-quantum-well system with lateral periodicity can mix optical and acoustic plasmons, giving rise to an interlayer THz field which becomes very strong when tuned by gate voltage into the “mode-mode-repulsion” regime wherein the optical and acoustic modes equally share amplitude. This can enhance interlayer electron tunneling and may contribute to photoconductivity.
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Kishimoto, Satoshi, Yoshihisa Tanaka, Yong Ming Xing, and Gyu Chang Lee. "Measurement of Strain and Stress Distribution of Composite Materials by Electron Moiré Method." Materials Science Forum 561-565 (October 2007): 717–20. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.717.

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A method for measuring the stress and strain distribution in the composite materials and residual stress at the interface in the fiber reinforced composite has been developed. The strains are measured using an electron Moiré method and then the stresses are calculated from these strains. A very fine model grid with frequencies up to 10,000lines/mm can be fabricated using the optical and electron lithography techniques on the surface of the specimen and an electron beam scan which spaces are almost same as that of model grid the can be used for master-grid. The difference of the amount of secondary electrons per a primary electron makes Moiré fringes that consists bright and dark parts. Micro-creep deformation and residual strain and stress near the fibers of composite materials were measured by this method.
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Mi, Da Hai, Rui Yang, Liang Zhou, Yang Liu, and Dong Ming Guo. "Frequency-Aimed Structural Optimal Design of Stiffened Plate." Advanced Materials Research 452-453 (January 2012): 1475–80. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.1475.

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Optimal structural design of stiffened plate structure with multi order modal frequencies objective is discussed. It is a structural reverse design problem for the first several order modal frequencies to reach a set of given value. A new method based on bi-directional evolutionary structural optimization (BESO) and size optimization is presented. To solve the porous and irregular shape problem in the optimized structure, a regular shaped grid-like frame structure optimization model is established. The bars in the frame structure are regarded as basic unites of structure modification. The bars’ sensitivity is discussed, and applied to optimization process based on frequency sensitivity. The structural optimal design process can be described as follows: the frequencies are used as the target, the volume is considered as constraint, adjacent sensitivity redistribution method is adopted to suppress numerical instability. Then size optimization method is adopted to conduct detailed design. Finally this method is applied to a stiffened plate structure. Results show that the proposed approach is feasible to achieve given multi order modal frequencies. The optimized structure consists of regular bars, so a clear structure is obtained.
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Jumani, Touqeer, Mohd Mustafa, Madihah Rasid, Nayyar Mirjat, Mazhar Baloch, and Sani Salisu. "Optimal Power Flow Controller for Grid-Connected Microgrids using Grasshopper Optimization Algorithm." Electronics 8, no. 1 (January 19, 2019): 111. http://dx.doi.org/10.3390/electronics8010111.

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Despite the vast benefits of integrating renewable energy sources (RES) with the utility grid, they pose stability and power quality problems when interconnected with the existing power system. This is due to the production of high voltages and current overshoots/undershoots during their injection or disconnection into/from the power system. In addition, the high harmonic distortion in the output voltage and current waveforms may also be observed due to the excessive inverter switching frequencies used for controlling distributed generator’s (DG) power output. Hence, the development of a robust and intelligent controller for the grid-connected microgrid (MG) is the need of the hour. As such, this paper aims to develop a robust and intelligent optimal power flow controller using a grasshopper optimization algorithm (GOA) to optimize the dynamic response and power quality of the grid-connected MG while sharing the desired amount of power with the grid. To validate the effectiveness of proposed GOA-based controller, its performance in achieving the desired power sharing ratio with optimal dynamic response and power quality is compared with that of its precedent particle swarm optimization (PSO)-based controller under MG injection and abrupt load change conditions. The proposed controller provides tremendous system’s dynamic response with minimum current harmonic distortion even at higher DG penetration levels.
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Ma, Shi Lei, Fang Yi Li, Yang He, and Qing Zhong Xu. "Multidisciplinary Design Optimization of Driving Axle Housing Using Sparse Grid Approach." Applied Mechanics and Materials 224 (November 2012): 82–86. http://dx.doi.org/10.4028/www.scientific.net/amm.224.82.

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In order to improve the engineering performance of lightweight design on the driving axle housing, lightweight, structural mechanics, fatigue strength and dynamics are applied in the multidisciplinary design optimization. Firstly, finite element model of driving axle housing was established and its accuracy was verified through bench tests. Secondly, driving axle housing system was divided into multiple sub-discipline systems and design variables of multidisciplinary lightweight design were determined, in order to solve the problems of large amount of data transmission and complex calculation, sparse grid approach was used to establish high accuracy approximate model of each discipline. Lastly, mass of driving axle housing and difference values of first six order modal frequencies before and after lightweight design were optimized through Non-dominated Sorted Genetic Algorithm-Ⅱ, the Pareto optimal solution set was obtained. In optimization results, masses of driving axle housing are all decreased compared to the initial design, meanwhile, the dynamic performance, structural static intensity and fatigue life are all ensured.
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Operto, Stéphane, Jean Virieux, Patrick Amestoy, Jean-Yves L’Excellent, Luc Giraud, and Hafedh Ben Hadj Ali. "3D finite-difference frequency-domain modeling of visco-acoustic wave propagation using a massively parallel direct solver: A feasibility study." GEOPHYSICS 72, no. 5 (September 2007): SM195—SM211. http://dx.doi.org/10.1190/1.2759835.

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We present a finite-difference frequency-domain method for 3D visco-acoustic wave propagation modeling. In the frequency domain, the underlying numerical problem is the resolution of a large sparse system of linear equations whose right-hand side term is the source. This system is solved with a massively parallel direct solver. We first present an optimal 3D finite-difference stencil for frequency-domain modeling. The method is based on a parsimonious staggered-grid method. Differential operators are discretized with second-order accurate staggered-grid stencils on different rotated coordinate systems to mitigate numerical anisotropy. An antilumped mass strategy is implemented to minimize numerical dispersion. The stencil incorporates 27 grid points and spans two grid intervals. Dispersion analysis showsthat four grid points per wavelength provide accurate simulations in the 3D domain. To assess the feasibility of the method for frequency-domain full-waveform inversion, we computed simulations in the 3D SEG/EAGE overthrust model for frequencies 5, 7, and [Formula: see text]. Results confirm the huge memory requirement of the factorization (several hundred Figabytes) but also the CPU efficiency of the resolution phase (few seconds per shot). Heuristic scalability analysis suggests that the memory complexity of the factorization is [Formula: see text] for a [Formula: see text] grid. Our method may provide a suitable tool to perform frequency-domain full-waveform inversion using a large distributed-memory platform. Further investigation is still necessary to assess more quantitatively the respective merits and drawbacks of time- and frequency-domain modeling of wave propagation to perform 3D full-waveform inversion.
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Stokholm, Amalie, Poul Erik Nissen, Víctor Silva Aguirre, Timothy R. White, Mikkel N. Lund, Jakob Rørsted Mosumgaard, Daniel Huber, and Jens Jessen-Hansen. "The subgiant HR 7322 as an asteroseismic benchmark star." Monthly Notices of the Royal Astronomical Society 489, no. 1 (August 12, 2019): 928–40. http://dx.doi.org/10.1093/mnras/stz2222.

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Abstract We present an in-depth analysis of the bright subgiant HR 7322 (KIC 10005473) using Kepler short-cadence photometry, optical interferometry from CHARA, high-resolution spectra from SONG, and stellar modelling using garstec grids, and the Bayesian grid-fitting algorithm basta. HR 7322 is only the second subgiant with high-quality Kepler asteroseismology for which we also have interferometric data. We find a limb-darkened angular diameter of 0.443 ± 0.007 mas, which, combined with a distance derived using the parallax from Gaia DR2 and a bolometric flux, yields a linear radius of 2.00 ± 0.03 R⊙ and an effective temperature of 6350 ± 90 K. HR 7322 exhibits solar-like oscillations, and using the asteroseismic scaling relations and revisions thereof, we find good agreement between asteroseismic and interferometric stellar radius. The level of precision reached by the careful modelling is to a great extent due to the presence of an avoided crossing in the dipole oscillation mode pattern of HR 7322. We find that the standard models predict a stellar radius systematically smaller than the observed interferometric one and that a sub-solar mixing length parameter is needed to achieve a good fit to individual oscillation frequencies, interferometric temperature, and spectroscopic metallicity.
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Jin, Daeho, Lazaros Oreopoulos, Dongmin Lee, Nayeong Cho, and Jackson Tan. "Contrasting the co-variability of daytime cloud and precipitation over tropical land and ocean." Atmospheric Chemistry and Physics 18, no. 4 (March 2, 2018): 3065–82. http://dx.doi.org/10.5194/acp-18-3065-2018.

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Abstract. The co-variability of cloud and precipitation in the extended tropics (35∘ N–35∘ S) is investigated using contemporaneous data sets for a 13-year period. The goal is to quantify potential relationships between cloud type fractions and precipitation events of particular strength. Particular attention is paid to whether the relationships exhibit different characteristics over tropical land and ocean. A primary analysis metric is the correlation coefficient between fractions of individual cloud types and frequencies within precipitation histogram bins that have been matched in time and space. The cloud type fractions are derived from Moderate Resolution Imaging Spectroradiometer (MODIS) joint histograms of cloud top pressure and cloud optical thickness in 1∘ grid cells, and the precipitation frequencies come from the Tropical Rainfall Measuring Mission (TRMM) Multi-satellite Precipitation Analysis (TMPA) data set aggregated to the same grid. It is found that the strongest coupling (positive correlation) between clouds and precipitation occurs over ocean for cumulonimbus clouds and the heaviest rainfall. While the same cloud type and rainfall bin are also best correlated over land compared to other combinations, the correlation magnitude is weaker than over ocean. The difference is attributed to the greater size of convective systems over ocean. It is also found that both over ocean and land the anti-correlation of strong precipitation with “weak” (i.e., thin and/or low) cloud types is of greater absolute strength than positive correlations between weak cloud types and weak precipitation. Cloud type co-occurrence relationships explain some of the cloud–precipitation anti-correlations. Weak correlations between weaker rainfall and clouds indicate poor predictability for precipitation when cloud types are known, and this is even more true over land than over ocean.
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Wang, Xiashuang, Guanghong Gong, and Ni Li. "Automated Recognition of Epileptic EEG States Using a Combination of Symlet Wavelet Processing, Gradient Boosting Machine, and Grid Search Optimizer." Sensors 19, no. 2 (January 9, 2019): 219. http://dx.doi.org/10.3390/s19020219.

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Automatic recognition methods for non-stationary electroencephalogram (EEG) data collected from EEG sensors play an essential role in neurological detection. The integrated approaches proposed in this study consist of Symlet wavelet processing, a gradient boosting machine, and a grid search optimizer for a three-class classification scheme for normal subjects, intermittent epilepsy, and continuous epilepsy. Fourth-order Symlet wavelets are adopted to decompose the EEG data into five frequencies sub-bands, such as gamma, beta, alpha, theta, and delta, whose statistical features were computed and used as classification features. The grid search optimizer is used to automatically find the optimal parameters for training the classifier. The classification accuracy of the gradient boosting machine was compared with that of a conventional support vector machine and a random forest classifier constructed according to previous descriptions. Multiple performance indices were used to evaluate the proposed classification scheme, which provided better classification accuracy and detection effectiveness than has been recently reported in other studies on three-class classification of EEG data.
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Dissertations / Theses on the topic "Grid of optical frequencies"

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Lukin, K. A., Yu P. Machekhin, and D. N. Tatyanko. "Grid of optical frequencies in a near infra-red range spectrum." Thesis, Paris, France, 2011. http://openarchive.nure.ua/handle/document/8671.

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Theoretical and experimental investigation the noise spectral interferometry method for creation of the optical frequencies grids was carried out. Finding out, which kind of optical sources can be used for such tasks, and which limits of the frequency resolution has been achieved.
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Isaac, Thomas Henry. "Tunable plasmonic structures for terahertz frequencies." Thesis, University of Exeter, 2009. http://hdl.handle.net/10036/90193.

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The terahertz frequency range is a relatively unstudied region of the electromagnetic spectrum. However with the emergence of numerous applications for terahertz light in diverse areas such as security scanning, biological imaging, gas spectroscopy and astrophysics there has been considerable recent growth in the volume of research activity in this area. The studies presented in this thesis aim to introduce the physics of surface plasmons to the terahertz frequency range, and on the way to use some of the unique capabilities of terahertz spectroscopy to try and find new information about fundamental surface-plasmon based electromagnetic structures. Four distinct experiments are described in this work, all of them underpinned by the technique of terahertz time-domain spectroscopy (Chapter 2). This is a very powerful and adaptable spectroscopic method which allows us to measure the electric field of pulsed terahertz radiation as a function of time. This in turn allows us to directly extract both phase and amplitude of the terahertz light as a function of frequency, over a broad frequency range. Furthermore, this method of terahertz spectroscopy can be combined with photoexcitation pulses of visible/NIR light which can be used to make dynamic changes to the properties of materials in the terahertz beam. The first experiment reported (Chapter 3) measures the propagation of coupled surface plasmons in a resonant slit cavity. We use terahertz time-domain spec- troscopy to determine the characteristics of the cavity resonances in a semiconductor slit near the surface plasma frequency of the material, where we are able to mea- sure very large red-shifts in the frequency of the cavity resonance. By considering the phase information which can be extracted directly from time-resolved terahertz measurements we are able to link the behaviour of the resonances to the propagation characteristics of the surface plasmon modes inside the slits. The second experiment (Chapter 4) is a more direct measurement of surface plasmons, propagated over the surface of a semiconductor wafer. We show that the electric field of the surface plasmon is confined to a subwavelength region around the surface, and that the confined field is useful for spectroscopy of very thin layers above the surface. We are able to measure films with thickness less than 1/600th of the wavelength of the terahertz light. After these two experiments with confined semiconductor surface plasmons we move on to a pair of experiments looking at terahertz surface modes mediating the transmission of light through holes in metal films. In the initial experiment (Chapter 5) we use the time-domain data from terahertz spectroscopy to determine the role that surface mode lifetime plays in modifying the amplitude and width of Extraor- dinary Optical Transmission (EOT) resonances, which arise from the periodicity of a hole-array lattice. By changing the temperature of the lossy dielectric semicon- ductor substrate we are able to modify the surface mode lifetime, and link this to the resonant transmission characteristics. In Chapter 6 we extend the hole array EOT experiment by making dynamic changes to the propagation of the surface mode which mediates the transmission. This is achieved by photo-exciting the semiconductor substrate inside the holes and forming a thin layer of material with high charge carrier density on the surface. Interaction of the surface mode with the photoexcited region quenches the resonant transmission. We show that by changing the hole size so that the surface-mode mediated transmission pathway predominates in the spectrum it is possible to use optical pulses to modulate the transmission of terahertz radiation with very high efficiency. In the conclusions (Chapter 7) we link together some of the insights and infer- ences which can be drawn from the above results, as well as evaluating the efficacy of the experimental and simulation methodology.
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McNiff, James Edward. "An experimental study of nonlinear dielectrics at microwave frequencies." Thesis, University of Salford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261855.

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Cheung, Chun Tung Rutledge David B. "Waveguide packaging of quasi-optical grid amplifiers /." Diss., Pasadena, Calif. : California Institute of Technology, 2003. http://resolver.caltech.edu/CaltechETD:etd-05192003-161134.

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Hu, Ziang. "Characterisation of orbital angular momentum at optical and radio frequencies." Thesis, University of Bristol, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.738525.

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Zhu, Min. "Research on key techniques in passive optical networks and optical grid applications." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00907280.

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The bandwidth-intensive applications, such as interactive video and multimedia services, have further increased the demand of bandwidth. Thus wavelength division multiplexing passive optical network (WDM-PON) is viewed as a promising candidate to realize the next generation optical access networks due to its dedicated bandwidth for each subscriber and more flexible bandwidth management. The first half of this thesis will cover three technologies in a WDM-PON, including multicast overlay scheme, automatic protection switching scheme and tunable Fabry-Pérot laser diode (FP-LD) self-seeding scheme. In the second half of the thesis, WDM optical network is utilized as a virtual computing environment, which connects widely distributed computing resources to support large-scale scientific, engineering or commercial computing applications. It is so called "optical Grid" systems. Grid applications may range from the simple transfer of a large data set to the complex execution of a collection of interdependent tasks. However, for such a system involving many heterogeneous computing and network resources, faults seem to be inevitable. This thesis will also address the issue of maximizing grid application availability in real-time optical Grid systems through resource-fault-tolerant scheduling techniques.
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Quadir, A. "Finite element characterisation of plasmonic waveguides in terahertz and optical frequencies." Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/17568/.

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In recent years plasmonic devices have become an interesting area of research due to the sub-wavelength confinement and propagation of radiation, allowing the design of very compact structures. Compact structures are necessary to make smaller integrated optical circuits. Due to the use of metals, plasmonic guides usually show more losses compared to the conventional dielectric guides. Therefore, plasmonic waveguides are not normally used for long distance transmission. However, they are promising for inter-chip or intra-chip communication and also have seen a lot of sensor applications. There has been considerable interest in exploiting the frequency bands in the terahertz regime to open up new frontiers of research across a diverse range of applications. An array of opportunities for creating novel technologies using this frequency band had remained largely unexplored and undeveloped for a considerable period of time due to the lack of suitable sources, as well as lack of guiding and detecting devices. This thesis describes the design, analysis and optimisation of plasmonic devices in optical and terahertz frequencies. A fully vectorial H-field based finite element method has been used in the research reported in this thesis to reveal the modal characteristics of different plasmonic structures. A six layer planar contra-directional nano-coupler has been analysed at optical frequency. Three different modes of propagation were considered to study the characteristics of different properties of the structure, including the coupling length. A design approach has been proposed to make the coupler low loss as well as smaller in length. For the terahertz plasmonics, a rectangular metallic hollow core guide was considered at terahertz frequency. Several modes were considered for the modal analysis of the structure. Modal analysis was performed by changing metal, introducing different dielectric coating in the hollow core, changing the thickness of the metal and dielectric layers and changing the dimensions of the guide. A dispersion analysis was also performed. The criteria for designing very low loss, compact and low dispersion guide have been presented for the structure at the end of the study.
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Almousa, Shaikhah F. "Extraordinary Optical Transmission in Aligned Carbon Nanotube Devices at Terahertz Frequencies." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1493566948712806.

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Bodkin, David Bradley. "Color, tilt, and the Hermann grid illusion /." Adobe Acrobat Reader required to view document, 2008. http://library.neco.edu/theses/BodkinThesisApr08.pdf.

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Terra, Osama [Verfasser]. "Dissemination of ultra-stable optical frequencies over commercial fiber network / Osama Terra." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover, 2010. http://d-nb.info/1010837621/34.

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Books on the topic "Grid of optical frequencies"

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Anatasovski, P. K. Theory of magnetic and electric susceptibilities for optical frequencies. New York: Nova Science Publishers, 1990.

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Morin, André. Feasibility of a modulating grid optical pressure sensor. [Montréal]: Transportation Development Centre, Transport Canada, 2002.

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Forstmann, F. Metal optics near the plasma frequency. Berlin: Springer-Verlag, 1986.

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Singer, Kenneth D. "Poling of microwave electro-optic devices": Final technical report : contract # NCC3-431. [Washington, DC: National Aeronautics and Space Administration, 1997.

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International Conference on Security-Enriched Urban Computing and Smart Grid (1st (2010 Taejŏn-si, Korea)). Security-enriched urban computing and smart grid: First International Conference, SUComS 2010, Daejeon, Korea, September 15-17, 2010, proceedings. Berlin: Springer, 2010.

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Theory of Magnetic and Electric Susceptibilities for Optical Frequencies. Nova Science Publishers, 1991.

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Yan, Wang. Ultra-compact contra-directional plasmonic coupler at optical frequencies. 2006.

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Nano-Electromagnetic Communication at Terahertz and Optical Frequencies: Principles and Applications. SciTech Publishing, Incorporated, 2020.

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Alomainy, Akram, Ke Yang, Muhammad A. Imran, Xin-Wei Yao, and Qammer H. Abbasi, eds. Nano-Electromagnetic Communication at Terahertz and Optical Frequencies: Principles and Applications. Institution of Engineering and Technology, 2019. http://dx.doi.org/10.1049/sbew542e.

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Center, Lewis Research, ed. Optical channelizer evaluation using empirical data and simulation. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Book chapters on the topic "Grid of optical frequencies"

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Bründermann, Erik, Heinz-Wilhelm Hübers, and Maurice F. Kimmitt. "Optical Principles at Terahertz Frequencies." In Springer Series in Optical Sciences, 23–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-02592-1_2.

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Zhang, Shuang. "Invisibility Cloak at Optical Frequencies." In Transformation Electromagnetics and Metamaterials, 289–314. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4996-5_10.

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Morin, Steven E., Qilin Wu, and Thomas W. Mossberg. "Cavity Quantum Electrodynamics at Optical Frequencies." In Confined Electrons and Photons, 857–63. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1963-8_44.

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Potylitsyn, Alexander Petrovich, Mikhail Ivanovich Ryazanov, Mikhail Nikolaevich Strikhanov, and Alexey Alexandrovich Tishchenko. "Diffraction Radiation at Optical and Lower Frequencies." In Springer Tracts in Modern Physics, 55–103. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12513-3_3.

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Julienne, Paul S. "Collision-Induced Radiative Transitions at Optical Frequencies." In Phenomena Induced by Intermolecular Interactions, 749–71. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2511-6_43.

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Lord, Andrew, Yu Rong Zhou, Rich Jensen, Annalisa Morea, and Marc Ruiz. "Evolution from Wavelength-Switched to Flex-Grid Optical Networks." In Optical Networks, 7–30. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30174-7_2.

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Binczewski, A., L. Grzesiak, E. Kenny, M. Stroinski, R. Szuman, S. Trocha, and J. Weglarz. "Monitoring Solution for Optical Grid Architectures." In Grid Enabled Remote Instrumentation, 161–72. New York, NY: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-09663-6_10.

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Soukoulis, C. M. "3D Photonic Crystals: From Microwaves to Optical Frequencies." In Photonic Crystals and Light Localization in the 21st Century, 25–40. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0738-2_2.

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Lau, Kam Y. "Resonant Modulation of Monolithic Laser Diodes at Millimeter-Wave Frequencies." In Springer Series in Optical Sciences, 93–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-16458-3_9.

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Christodoulopoulos, Konstantinos, Emmanouel Varvarigos, Chris Develder, Marc De Leenheer, and Bart Dhoedt. "Job Demand Models for Optical Grid Research." In Optical Network Design and Modeling, 127–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-72731-6_15.

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Conference papers on the topic "Grid of optical frequencies"

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Giacomazzi, E., E. Giulietti, C. Stringola, S. Cassani, L. Pagliari, and S. Chiocchini. "Combustion Monitoring in Gas Turbines and Enhanced Stability at Very Lean Conditions." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25506.

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In the near future, combustion dynamics is expected to become a more critical issue in operation of lean premixed gas turbines. Firstly, due to the lack of a quality harmonization code for the gas injected in the distribution network: this increases fuel composition variability at the inlet of gas turbine combustors. Secondly, due to the increasing share of renewable sources of energy in the electricity grid: this causes more likely power fluctuations. Gas turbines will be required to perform quicker loading and unloading phases than current ones (while maintaining their stability and low pollutant emissions) to guarantee the grid stability. Such a scenario highlights the importance of developing reliable and robust combustion instability sensing techniques to be integrated into control systems. Besides, it also shows the need for new and more efficient gas turbine “parking” strategies with lower minimum environmental loads. With these needs in mind, this work compares an optical device (ODC, Optical Diagnostics of Combustion) with standard high-temperature pressure-transducers while monitoring the stable and unstable conditions of an experimental combustor equipped with an ANSALDO-SIEMENS V64.3A burner fed with lean CH4/Air mixtures. Pressure and flame radiant energy signals are compared in terms of frequencies and associated amplitudes. It is also suggested how they can be used for the early detection of thermo-acoustic instabilities, i.e., for the real-time identification of instability precursors. Then, tests are repeated at the same conditions using a V64.3A burner modified to operate in the volumetric combustion regime. Tests prove its enhanced stability, thus suggesting volumetric combustion as a strategy to operate gas turbines at lower loads.
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Yu, Jiuyang, Wei Wang, Xia Yang, Jianmin Xu, Wei Lin, Jie Zhang, Jiuyang Gao, and Xin Wang. "Numerical Analysis on Convection Heat Transfer of Pulsating Flow in a Corrugated Tube." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25608.

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Heat transfer enhancement of corrugated tube in Laminar flow was studied using CFD. Numerical calculation performed with grids of increasing density confirms that the grids are independent. In order to get the optimal numerical calculation the boundary layer was refined. The final grid consisted of 146,000 computational cells. The fluid inlet was defined as a velocity inlet with a sinuaoidal pulasating flow input. The outlet was modeled as a pressure-outlet. By numerical simulation, the distribution of velocity and temperature of the corrugated tube of different conditions in different Reynolds number (380–1900) of steady flow, and the vibration frequency (50–200HZ)and the vibration amplitude of sinusoidal (0.1–0.9) pulsating flow is analysed, thus the characteristics of distribution of velocity and temperature are demonstrated. The simulation result indicates that by comparing with the steady flow, the pulsating flow increases the heat transfer efficiency of the corrugated tube in Laminar flow by 83% for most. The enhancement is due to the pulsating flow increating vortex. The vortex result in increasrs disturbance, decreasing the thermal boundary layer thickness, enhancing heat transfer of the corrugated tube. The result also shows that enhancement of heat transfer coefficient inceases as the velocity rises in a certain range, and it also increases as the frequency rises before reaching the peak point and then decreases as the vibration frequency rises in a certain range. Under the condition of none-backflow, the velocity of increasing enhancement of heat transfer coefficient becomes slower and slower as the vibration amplitude rises. In our study, the best dimensionless pulsating frequencies of the corrugated tube are 100∼200 Hz and the amplitudes are 0.4∼0.6, when condition that the Reynolds number is ranged from 380 to 1900.
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Kaszynski, Alex A., Joseph A. Beck, and Jeffrey M. Brown. "Automated Meshing Algorithm for Generating As-Manufactured Finite Element Models Directly From As-Measured Fan Blades and Integrally Bladed Disks." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76375.

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Automated tetrahedral meshing from manifold tessellated optical scan data is investigated to determine its viability as an approach for finite element analysis. This approach avoids the costs of constructing a volumetric representation of the scan data that can be meshed with conventional grid generation approaches. This paper demonstrates an auto-meshing algorithm for inserted airfoil and integrally bladed rotor hardware. These automatically generated models are compared to experimentally obtained frequencies and mode shapes for validation. In an effort to compare the fidelity as well as the effect of mesh density on analytical convergence rate, manually generated all-hexahedral models are compared against the auto-meshed tetrahedral finite element models. CPU time, solution accuracy, and mesh convergence are evaluated to determine the viability of automatically generated tetrahedral meshes versus the standard approach of manually generating hex-dominant meshes. This paper demonstrates that given the power of modern CPUs, automatically generated all-tetrahedral meshes can serve as a viable alternative to manually generated hex-dominant finite element models, especially when these meshes can be refined for solution convergence within the auto-mesher. This new approach effectively solves both the mesh convergence problem while demonstrating that models based on as-measured geometry can be rapidly built with virtually no human interaction.
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Reynders, Edwin, Dimitrios Anastasopoulos, and Guido De Roeck. "Vibration-based structural health monitoring from operational long- gauge fiber optic strain data." In IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.0571.

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<p>Vibration monitoring from strain data is a promising alternative to acceleration-based monitoring because a dense measurement grid can be achieved at a relatively low cost and because strain mode shapes are more sensitive to local stiffness changes than displacement mode shapes. However, the feasibility of monitoring strain mode shapes of full-scale civil structures, where the operational dynamic strain levels are of very low amplitude and temperature changes can influence the modal characteristics, has remained an open question. The present work provides a proof of concept in which the deck of a steel bowstring railway bridge is instrumented with 80 Fiber-optic Bragg Grating strain sensors, multiplexed in four fibers, that are interrogated with a technique that achieves high accuracy and precision. For more than a year, the natural frequencies and strain mode shapes of 10 modes have been automatically identified from operational strain time histories, with typical root- mean-square values of 0.01 microstrain, on an hourly basis. Furthermore, using these modal data, the influence of temperature fluctuations and that of a retrofitting of the hangers connecting the bridge deck and the bow, which took place during the monitoring period, are extensively investigated. Both have an influence on the overall stiffness of the bridge and therefore they result in clear changes in the natural frequencies. They do not have an influence on the local stiffness and therefore they do not influence the strain mode shapes, except when the retrofitting induces an interaction between previously well-separated modes.</p>
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Reynders, Edwin, Dimitrios Anastasopoulos, and Guido De Roeck. "Vibration-based structural health monitoring from operational long- gauge fiber optic strain data." In IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.0571.

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<p>Vibration monitoring from strain data is a promising alternative to acceleration-based monitoring because a dense measurement grid can be achieved at a relatively low cost and because strain mode shapes are more sensitive to local stiffness changes than displacement mode shapes. However, the feasibility of monitoring strain mode shapes of full-scale civil structures, where the operational dynamic strain levels are of very low amplitude and temperature changes can influence the modal characteristics, has remained an open question. The present work provides a proof of concept in which the deck of a steel bowstring railway bridge is instrumented with 80 Fiber-optic Bragg Grating strain sensors, multiplexed in four fibers, that are interrogated with a technique that achieves high accuracy and precision. For more than a year, the natural frequencies and strain mode shapes of 10 modes have been automatically identified from operational strain time histories, with typical root- mean-square values of 0.01 microstrain, on an hourly basis. Furthermore, using these modal data, the influence of temperature fluctuations and that of a retrofitting of the hangers connecting the bridge deck and the bow, which took place during the monitoring period, are extensively investigated. Both have an influence on the overall stiffness of the bridge and therefore they result in clear changes in the natural frequencies. They do not have an influence on the local stiffness and therefore they do not influence the strain mode shapes, except when the retrofitting induces an interaction between previously well-separated modes.</p>
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Alù, Andrea, and Nader Engheta. "Nanoconnectors at Optical Frequencies." In Frontiers in Optics. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/fio.2007.fthr2.

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Riehle, Fritz, Harald Schnatz, G. Zinner, Tilmann Trebst, and Juergen Helmcke. "Precision optical reference frequencies." In 10th International School on Quantum Electronics: Lasers--Physics and Applications, edited by Peter A. Atanasov and Dimitar V. Stoyanov. SPIE, 1999. http://dx.doi.org/10.1117/12.347593.

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Davis, Peter, and Paul S. Wright. "Measurement of Grid Impedance at Harmonic Frequencies." In 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018). IEEE, 2018. http://dx.doi.org/10.1109/cpem.2018.8501186.

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Bouchareine, P., O. Cabon, P. Juncar, R. Goebel, Y. Millerioux, and A. Razet. "Interferential Metrology Of Optical Frequencies." In 14th Congress of the International Commission for Optics, edited by Henri H. Arsenault. SPIE, 1987. http://dx.doi.org/10.1117/12.967257.

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Coull, John D., Richard L. Thomas, and Howard P. Hodson. "Velocity Distributions for Low Pressure Turbines." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50589.

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A parametric set of velocity distributions has been investigated using a flat plate experiment. Three different diffusion factors and peak velocity locations were tested. These were designed to mimic the suction surfaces of Low Pressure (LP) turbine blades. Unsteady wakes, inherent in real turbomachinery flows, were generated using a moving bar mechanism. A turbulence grid generated a freestream turbulence level that is believed to be typical of LP turbines. Measurements were taken across a Reynolds number range of 50,000–220,000 at three reduced frequencies (0.314, 0.628, 0.942). Boundary layer traverses were performed at the nominal trailing edge using a Laser Doppler Anemometry system and hot-films were used to examine the boundary layer behaviour along the surface. For every velocity distribution tested, the boundary layer separated in the diffusing flow downstream of the peak velocity. The loss production is dominated by the mixing in the reattachment process, mixing in the turbulent boundary layer downstream of reattachment and the effects of the unsteady interaction between the wakes and the boundary layer. A sensitive balance governs the optimal location of peak velocity on the surface. Moving the velocity peak forwards on the blade was found to be increasingly beneficial when bubble-generated losses are high, i.e. at low Reynolds number, at low reduced frequency and at high levels of diffusion.
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Reports on the topic "Grid of optical frequencies"

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E. Topsakal and J.L. Volakis. On the Properties of Materials for Designing Filters at Optical Frequencies. Office of Scientific and Technical Information (OSTI), May 2003. http://dx.doi.org/10.2172/821377.

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Atwater, Harry A., Axel Scherer, Oskar J. Painter, Eli Yablonovitch, Xiang Zhang, and Federico Capasso. Novel Devices for Plasmonic and Nanophotonic Networks: Exploiting X-ray Wavelengths at Optical Frequencies. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada593919.

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Oliver Yu. ISOGA: Integrated Services Optical Grid Architecture for Emerging E-Science Collaborative Applications. Office of Scientific and Technical Information (OSTI), November 2008. http://dx.doi.org/10.2172/948742.

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Bucholtz, Frank, William Rabinovich, and Charmaine Gilbreath. A Study of Photoreceivers for Free-Space, Analog, Intensity-Modulated, Direct-Detection Optical Links Operating at Microwave Frequencies. Fort Belvoir, VA: Defense Technical Information Center, September 2010. http://dx.doi.org/10.21236/ada530449.

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Buric, Michael P., Paul R. Ohodnic, Kevin Chen, and Ping Lu. Optical Fiber Sensor Technology Development and Field Validation for Distribution Transformer and Other Grid Asset Health Monitoring. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1634092.

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Kuznetsov, Victor, Vladislav Litvinenko, Egor Bykov, and Vadim Lukin. A program for determining the area of the object entering the IR sensor grid, as well as determining the dynamic characteristics. Science and Innovation Center Publishing House, April 2021. http://dx.doi.org/10.12731/bykov.0415.15042021.

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Currently, to evaluate the dynamic characteristics of objects, quite a large number of devices are used in the form of chronographs, which consist of various optical, thermal and laser sensors. Among the problems of these devices, the following can be distinguished: the lack of recording of the received data; the inaccessibility of taking into account the trajectory of the object flying in the sensor area, as well as taking into consideration the trajectory of the object during the approach to the device frame. The signal received from the infrared sensors is recorded in a separate document in txt format, in the form of a table. When you turn to the document, data is read from the current position of the input data stream in the specified list by an argument in accordance with the given condition. As a result of reading the data, it forms an array that includes N number of columns. The array is constructed in a such way that the first column includes time values, and columns 2...N- the value of voltage . The algorithm uses cycles that perform the function of deleting array rows where there is a fact of exceeding the threshold value in more than two columns, as well as rows where the threshold level was not exceeded. The modified array is converted into two new arrays, each of which includes data from different sensor frames. An array with the coordinates of the centers of the sensor operation zones was created to apply the Pythagorean theorem in three-dimensional space, which is necessary for calculating the exact distance between the zones. The time is determined by the difference in the response of the first and second sensor frames. Knowing the path and time, we are able to calculate the exact speed of the object. For visualization, the oscillograms of each sensor channel were displayed, and a chronograph model was created. The chronograph model highlights in purple the area where the threshold has been exceeded.
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Bonfil, David J., Daniel S. Long, and Yafit Cohen. Remote Sensing of Crop Physiological Parameters for Improved Nitrogen Management in Semi-Arid Wheat Production Systems. United States Department of Agriculture, January 2008. http://dx.doi.org/10.32747/2008.7696531.bard.

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To reduce financial risk and N losses to the environment, fertilization methods are needed that improve NUE and increase the quality of wheat. In the literature, ample attention is given to grid-based and zone-based soil testing to determine the soil N available early in the growing season. Plus, information is available on in-season N topdressing applications as a means of improving GPC. However, the vast majority of research has focused on wheat that is grown under N limiting conditions in sub-humid regions and irrigated fields. Less attention has been given to wheat in dryland that is water limited. The objectives of this study were to: (1) determine accuracy in determining GPC of HRSW in Israel and SWWW in Oregon using on-combine optical sensors under field conditions; (2) develop a quantitative relationship between image spectral reflectance and effective crop physiological parameters; (3) develop an operational precision N management procedure that combines variable-rate N recommendations at planting as derived from maps of grain yield, GPC, and test weight; and at mid-season as derived from quantitative relationships, remote sensing, and the DSS; and (4) address the economic and technology-transfer aspects of producers’ needs. Results from the research suggest that optical sensing and the DSS can be used for estimating the N status of dryland wheat and deciding whether additional N is needed to improve GPC. Significant findings include: 1. In-line NIR reflectance spectroscopy can be used to rapidly and accurately (SEP <5.0 mg g⁻¹) measure GPC of a grain stream conveyed by an auger. 2. On-combine NIR spectroscopy can be used to accurately estimate (R² < 0.88) grain test weight across fields. 3. Precision N management based on N removal increases GPC, grain yield, and profitability in rainfed wheat. 4. Hyperspectral SI and partial least squares (PLS) models have excellent potential for estimation of biomass, and water and N contents of wheat. 5. A novel heading index can be used to monitor spike emergence of wheat with classification accuracy between 53 and 83%. 6. Index MCARI/MTVI2 promises to improve remote sensing of wheat N status where water- not soil N fertility, is the main driver of plant growth. Important features include: (a) computable from commercial aerospace imagery that include the red edge waveband, (b) sensitive to Chl and resistant to variation in crop biomass, and (c) accommodates variation in soil reflectance. Findings #1 and #2 above enable growers to further implement an efficient, low cost PNM approach using commercially available on-combine optical sensors. Finding #3 suggests that profit opportunities may exist from PNM based on information from on-combine sensing and aerospace remote sensing. Finding #4, with its emphasis on data retrieval and accuracy, enhances the potential usefulness of a DSS as a tool for field crop management. Finding #5 enables land managers to use a DSS to ascertain at mid-season whether a wheat crop should be harvested for grain or forage. Finding #6a expands potential commercial opportunities of MS imagery and thus has special importance to a majority of aerospace imaging firms specializing in the acquisition and utilization of these data. Finding #6b on index MCARI/MVTI2 has great potential to expand use of ground-based sensing and in-season N management to millions of hectares of land in semiarid environments where water- not N, is the main determinant of grain yield. Finding #6c demonstrates that MCARI/MTVI2 may alleviate the requirement of multiple N-rich reference strips to account for soil differences within farm fields. This simplicity will be less demanding of grower resources, promising substantially greater acceptance of sensing technologies for in-season N management.
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Tire Experimental Characterization Using Contactless Measurement Methods. SAE International, August 2021. http://dx.doi.org/10.4271/2021-01-1114.

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In the frame of automotive Noise Vibration and Harshness (NVH) evaluation, inner cabin noise is among the most important indicators. The main noise contributors can be identified in engine, suspensions, tires, powertrain, brake system, etc. With the advent of E-vehicles and the consequent absence of the Internal Combustion Engine (ICE), tire/road noise has gained more importance, particularly at mid-speed driving and in the spectrum up to 300 Hz. At the state of the art, the identification and characterization of Noise and Vibration sources rely on pointwise sensors (microphones, accelerometers, strain gauges). Optical methods such as Digital Image Correlation (DIC) and Laser Doppler Vibrometer (LDV) have recently received special attention in the NVH field because they can be used to obtain full-field measurements. Moreover, these same techniques could also allow to characterize the tire behavior in operating conditions, which would be practically impossible to derive with standard techniques. In this paper we will demonstrate how non-contact full-field measurement techniques can be used to reliably and robustly characterize the tire behavior up to 300 Hz, focusing on static conditions. Experimental modal analysis will extract the modal characteristic of the tire in both free-free and statically preloaded boundary conditions, using both DIC and LDV. The extracted natural frequencies, damping ratios and full-field mode shapes will be used on one side to improve the accuracy of tire models (either by deriving FRF based models or updating FE ones) but also as a reference for future investigation on the tire behavior characterization in rotating conditions.
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