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Gotowa bibliografia na temat „STEP-INDEX”

Autor: Grafiati

Data publikacji: 11 września 2023

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Artykuły w czasopismach na temat "STEP-INDEX"

Hadley, G. Ronald. "Index-guided arrays with a large index step". Optics Letters 14, nr 6 (15.03.1989): 308. http://dx.doi.org/10.1364/ol.14.000308.

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Exner, Kai S. "The electrochemical-step asymmetry index". MethodsX 8 (2021): 101590. http://dx.doi.org/10.1016/j.mex.2021.101590.

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Zitelli, Mario, Yifan Sun, Mario Ferraro, Fabio Mangini, Oleg Sidelnikov, Vincent Couderc i Stefan Wabnitz. "Multimode solitons in step-index fibers". Optics Express 30, nr 4 (11.02.2022): 6300. http://dx.doi.org/10.1364/oe.446482.

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Applegate, Matthew B., Giovanni Perotto, David L. Kaplan i Fiorenzo G. Omenetto. "Biocompatible silk step-index optical waveguides". Biomedical Optics Express 6, nr 11 (2.10.2015): 4221. http://dx.doi.org/10.1364/boe.6.004221.

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HAMED, A. M. "Step index fibre using laser interferometer". Pramana 82, nr 3 (marzec 2014): 529–36. http://dx.doi.org/10.1007/s12043-014-0706-9.

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Montanari, G. B., P. De Nicola, S. Sugliani, A. Menin, A. Parini, A. Nubile, G. Bellanca, M. Chiarini, M. Bianconi i G. G. Bentini. "Step-index optical waveguide produced by multi-step ion implantation in LiNbO_3". Optics Express 20, nr 4 (8.02.2012): 4444. http://dx.doi.org/10.1364/oe.20.004444.

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Nötzel, R., D. Eissler, M. Hohenstein i K. Ploog. "Periodic mesoscopic step arrays by step bunching on high‐index GaAs surfaces". Journal of Applied Physics 74, nr 1 (lipiec 1993): 431–35. http://dx.doi.org/10.1063/1.354128.

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Nötzel, R., D. Eissler i K. Ploog. "Mesoscopic step arrays by periodic step bunching on high-index GaAs surfaces". Journal of Crystal Growth 127, nr 1-4 (luty 1993): 1068–72. http://dx.doi.org/10.1016/0022-0248(93)90793-v.

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Slavchev, V., A. Dakova, N. Gocheva, I. Bozhikoliev, K. Kovachev i A. Biswas. "Laser ring structures in step-index fibers". Journal of Physics: Conference Series 2339, nr 1 (1.09.2022): 012007. http://dx.doi.org/10.1088/1742-6596/2339/1/012007.

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Abstract The formation and propagation of optical ring structures, given by a system of amplitude equations for the components of the electric field is investigated. The calculations are made in approximation of second-order linear dispersion and self-phase modulation. New class analytical solutions, characterizing the generation and evolution of laser ring structures in optical waveguides with step-index profile and anomalous dispersion, are described in the present work. The stability of these optical formations is a result of the specific combination of nonlinearity, diffraction and angular distribution. Laser vortices have an amplitude type of singularity which appears as depolarization of the vector field in the light radiation spot.

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Salih, Aqeel R. "Design of Step-Index Multimode Optical Fiber". Journal of Physics: Conference Series 1879, nr 3 (1.05.2021): 032074. http://dx.doi.org/10.1088/1742-6596/1879/3/032074.

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Rozprawy doktorskie na temat "STEP-INDEX"

Abdul, Khudus Muhammad Imran Mustafa. "Ultraviolet generation in step index optical fibres and microfibres". Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/419404/.

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Coherent ultraviolet (UV) generation has various applications in a large number of fields, such as stand-off explosive detection, enhanced Raman scattering and photolithography, to name a few. Typically, the generation of coherent UV light relied on frequency doubling with nonlinear crystals and relatively complicated free space optics, on toxic gases (excimers) and low power UV diodes. In this thesis, the use of solid core step-index optical fibre for the generation of coherent UV radiation is investigated. Here, wavelength conversion in optical microfibres (OMFs) via nonlinear processes is considered. Firstly, efficient generation of UV radiation via intermodal third harmonic generation (THG) in fibres is first studied. While THG is potentially efficient in OMFs, it is not feasible in optical fibres with large numerical apertures. Detuning is found to be a critical parameter which determines the overall efficiency, thereby making the OMF diameter control crucial. Initial experiments indicate that the quasi-continuous wave (CW) sources with long pulses (a few ns) and high peak powers (∼ kW) are the most suitable for intermodal THG in OMFs, as detrimental nonlinear effects become dominant with ultrashort pulses. However, further theoretical investigations show that intermodal THG is fundamentally limited by the intrinsic surface roughness of the silica OMFs, restricting the maximum efficiency to ∼ 10^-3. This leads to the investigation of four wave mixing (FWM), where both parametric amplification and wavelength generation are theoretically investigated. A quasi-CW source working in conjunction with a periodically poled silica fibre (PPSF) is employed to investigate this experimentally, and it is shown that a scheme employing two OMFs allowed the generation of coherent UV radiation down to 0:31 μm, with fundamental limitations being imposed from losses due to the oxygen-deficiency centre inherent to the fibre.

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Asimakis, Symeon. "Nonlinear applications of step-index and microstructured soft-glass fibres". Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/65526/.

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This thesis focuses on the potential of compound-glass, highly nonlinear, small-core fibres for use in nonlinear applications. Both fibres with a conventional step-index design and small-core holey fibres are considered. While the former technology is more mature, the latter represents the ultimate candidate, since it offers the flexibility of combining novel dispersion properties with a very high nonlinearity. With regard to holey fibre designs, small-core, compound-glass holey fibres with different core diameters and designs are considered for two different background materials: a commercially available lead-silicate glass and a bismuth-oxide based glass. Firstly, characterization measurements are performed on the fabricated holey fibres. The measurements reveal the advantages of each glass type and each fibre design, the ultra-high nonlinearity that can be achieved in such fibres and the potential of achieving simultaneously a novel dispersion profile and high nonlinearity. Nonlinear applications are then demonstrated for some of the fibres presented. In particular, the use of a lead-silicate holey fibre, having a dispersion-shifted profile, with a zero-dispersion wavelength lying close to the C-band is demonstrated in cross-phase modulation based wavelength conversion and switching applications in the 1.55 μm window. Both a co-polarized pump and probe scheme and a Kerr-shutter configuration are considered. For the same fibre, the stimulated four-wave mixing process for amplification and wavelength conversion applications in the C-band is thoroughly studied. Numerical simulations and experimental findings are combined to study the fibre performance, demonstrate its applicability to nonlinear wavelength conversion applications and identify future improvement objectives. The suitability of compound-glass holey fibres is also examined for the generation of correlated photons, through spontaneous four-wave mixing, and the generation of a broad supercontinuum by pumping at the convenient in terms of high power laser availability wavelength regions of 1.0 μm and 1.5 μm. The experiments presented in this thesis constitute the first nonlinear applications ever reported for dispersion-tailored, compound-glass holey fibres, clearly revealing their potential in fibre-based nonlinear applications. Nonlinear applications are also demonstrated for a commercially available, fiberised, bismuth-oxide based fibre with a step-index design. Using this fibre, an all-optical regenerator of Return-to-Zero picosecond pulses is realized at repetition rates of 10 and 40 Gb/s. The same fibre is also employed in an all-fiberised pulse compression scheme, which relies on nonlinear pulse propagation in the normal dispersion regime and enables the compression of picosecond pulses down to the femtosecond scale. In both applications, the ultra high nonlinearity of the compound-glass, step-index fibre results in reduced fibre-length and peak power requirements. The thesis concludes by addressing the issues concerning the practicality of compound-glass fibres and proposing potential future directions.

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Di, Labio Loredana. "Methods for manufacturing PCF and doped step-index fibres and their characterisation /". Bern, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000251255.

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Jankowski, Łukasz. "Modelling and simulation of light propagation in non-aged and aged step index polymer optical fibres". [Potsdam : Univ.-Bibliothek], 2004. http://pub.ub.uni-potsdam.de/volltexte/2005/174/.

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Jankowski, £ukasz. "Modelling and simulation of light propagation in non-aged and aged step-index polymer optical fibres". Phd thesis, Universität Potsdam, 2004. http://opus.kobv.de/ubp/volltexte/2005/173/.

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Kunststofflichtwellenleiter (POFs) stellen ein verhältnismäßig neues Medium zur optische Datenkommunikation über kurzen Strecken dar. Während ihrer Einsatzdauer unterliegen POFs unterschiedlichen Arten von Umweltbeanspruchungen, hauptsächlich durch hohe Temperatur, hohe Feuchtigkeit und mechanischen Belastungen. Zahlreiche experimentelle Forschungen beschäftigten sich mit der standardisierten Prüfung der Zuverlässigkeit von im Handel erhältlichen Fasern. Jedoch gab es bisher wenig Erfolg bei der Bemühung, zwei grundlegende optische Erscheinungen, Absorption und Streuung, die die Lichtausbreitung in Fasern stark beeinflussen, zu verstehen und praktisch zu modellieren: Diese beiden Effekte beschreiben nicht nur die Qualität neuer Fasern, sondern sie werden auch stark durch die Alterungsprozess beeinflusst.

Der Hauptzweck dieser Doktorarbeit war es, ein praktisch verwendbares und theoretisch gut fundiertes Modell der Lichtausbreitung in nicht gealterten und gealterten POFs zu entwickeln und es durch optische Experimente zu verifizieren. Dabei wurden anwendungsorientierte Aspekte mit theoretischer POF-Modellierung kombiniert. Die Arbeit enthält die erste bekannte Anwendung der Wellenanalyse zur Untersuchung der winkelabhängigen Eigenschaften der Streuung in Lichtwellenleitern.

Für die praktischen Experimente wurden mehrere POF-Proben unterschiedlicher Hersteller künstlich gealtert, indem sie bis 4500 Stunden bei 100 °C gelagert wurden (ohne Feuchtekontrolle). Die Parameter der jeweiligen Simulationen wurden mittels einer systematischen Optimierung an die gemessen optischen Eigenschaften der gealterten Proben angeglichen. Die Resultate deuten an, dass der Übertragungsverlust der gealterten Fasern in den ersten Tagen und Wochen der Alterung am stärksten durch eine wesentliche physikalische Verschlechterung der Kern-Mantel-Grenzfläche verursacht wird. Chemische Effekte des Alterungsprozesses scheinen im Faserkernmaterial zuerst nach einigen Monaten aufzutreten.
This thesis discusses theoretical and practical aspects of modelling of light propagation in non-aged and aged step-index polymer optical fibres (POFs). Special attention has been paid in describing optical characteristics of non-ideal fibres, scattering and attenuation, and in combining application-oriented and theoretical approaches. The precedence has been given to practical issues, but much effort has been also spent on the theoretical analysis of basic mechanisms governing light propagation in cylindrical waveguides.

As a result a practically usable general POF model based on the raytracing approach has been developed and implemented. A systematic numerical optimisation of its parameters has been performed to obtain the best fit between simulated and measured optical characteristics of numerous non-aged and aged fibre samples. The model was verified by providing good agreement, especially for the non-aged fibres. The relations found between aging time and optimal values of model parameters contribute to a better understanding of the aging mechanisms of POFs.

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Compere, Marc Damon. "Simulation of engineering systems described by high-index DAE and discontinuous ODE using single step methods". Thesis, Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3025206.

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Söderberg, Siri. "A Cradle to Cradle Study at Klättermusen". Thesis, Mittuniversitetet, Institutionen för teknik och hållbar utveckling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-17363.

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This study has been carried out at Klättermusen, a Swedish company producing outdoor clothingand equipment with a focus on durability, safety, function and environment. The purpose of thethesis was to investigate if Klättermusen should use Cradle to Cradle (C2C) in their sustainabilitywork. This was reviewed by studying the working procedure, by making a case study, byinvestigating if there are alternative ways to practise C2C, by studying the weak points of theC2C-certification and by investigating the compatibility with other sustainability tools.The C2C vision is inspired by the ecosystems and is based on the three rules Waste equals food, Usecurrent solar income and Celebrate diversity. An important aspect of C2C is the focus on attaining apositive impact on humans and the environment instead of doing things less bad by minimizingemissions. To make it possible for companies to communicate their effort and progress to theircustomers and become more competitive a C2C certification has been elaborated. The core ofthe certification is an assessment of the materials included in the product to make sure they aresecure, healthy and recyclable. Other parts included in the certification are energy, water andsocial aspects.When studying the C2C certification three of Klättermusen’s products were used as references.To certify these products Klättermusen has to gather information from their suppliers and makestrategies regarding Materials, Material Reutilization, Energy, Water and Social Responsibility. Forexample all the substances that contained in the garment at a concentration of at least 0.01 %must be reported, which means that all suppliers must be requested to list their substances. Thecertification cost of a pair of pants investigated in this study was estimated to 54 500 €.An assessment was made to find alternative ways to practise C2C and identify weak points of theC2C certification. It is based on interviews held with Jenny Pfau working for EPEA and threepersons in contact with C2C in their work; Kjersti Kviseth, Magnus Hedenmark and RichardBlume. According to Jenny Pfau Klättermusen can practise C2C by making a screening, a detailedassessment or a workshop. Both Magnus Hedenmark and Richard Blume practise the frameworkof The Natural Step and think that the C2C certification should be used as a tool within theframework. Some weak points found by these persons in the certification are that it is timeconsuming,not transparent enough and lack of a systems perspective.The C2C certification was compared with bluesign, a sustainability standard for the textileindustry, and Eco Index, a sustainability tool made for the outdoor industry. The purpose was toinvestigate if the C2C certification is compatible with other tools and the compared aspects weremainly lifecycle stages, impact categories and level of detail, but also purpose, procedure,workload, required knowledge and experience, cost, credibility and transparency.Both strengths and weaknesses were found when studying the C2C certification. It has got apositive approach to sustainability and develops safe products from a chemical perspective buthas a lack of systems perspective, is costly and time-consuming. The compatibility of the toolswas discussed with the comparison as a basis. Eco Index is modular and could be adjusted tocomplement the C2C certification but both tools have a big workload. bluesign and the C2Ccertification include the same lifecycle stages but have different strengths, which could makethem complementing each but possibly contradictive.Klättermusen is recommended to make a sustainability vision of their future products and thenchoose which tools to use. Since Klättermusen is already a bluesign system partner it could be agood idea to complement bluesign with Eco Index and C2C, but this choice should depend onthe future vision.

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Jankowski, Lukasz [Verfasser], Markus [Gutachter] Klein, Werner [Gutachter] Daum i Olaf [Gutachter] Ziemann. "Modelling and simulation of light propagation in non-aged and aged step-index polymer optical fibres / Lukasz Jankowski ; Bundesanstalt für Materialforschung und -prüfung (BAM) ; Gutachter: Markus Klein, Werner Daum, Olaf Ziemann". Berlin : Bundesanstalt für Materialforschung und -prüfung (BAM), 2005. http://d-nb.info/1122836570/34.

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Dipankar, Anurag. "Simulation des grandes échelles de la turbulence atmosphérique : application à l’étude de la propagation des ondes électromagnétiques dans la couche limite atmosphérique". Paris 6, 2010. http://www.theses.fr/2010PA066029.

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Cette thèse traite du couplage de la simulation des grandes échelles (LES) à la propagation des ondes électromagnétiques dans la couche limite atmosphérique. La simulation de la couche limite de convection avec des nuages de faible altitude de type cumulus a été effectuée, et les donnés ont été post-traitées pour la propagation d’ondes électromagnétiques (EM) dans le domaine simulé. La première partie de la thèse porte sur la validation du code LES avec pour trois différentes types de conditions atmosphériques. Les données correspondants à la convection des nuages de faible altitude de type cumulus sont ensuite post-traitées pour obtenir les quantités temporelles d’intérêt pour la modélisation de propagation d’ondes EM. Ces quantités sont les suivantes: la distribution instantanée des indices de réfraction, paramètres locaux de la fonction de structure de l’index de réfraction, échelle caractéristique des structures les plus énergétiques, et échelle caractéristique des échelles dissipatives non résolues. La deuxième partie de la thèse porte sur l’application de ces quantités dans la modélisation de propagation de: ondes radio, ondes optiques, et tourbillons optiques. Une nouvelle méthode a été développée pour étudier la dispersion des ondes radio dans l’atmosphére turbulente. Cette nouvelle méthode établit l’ importance des fluctuations des grandes échelles sur les fluctuations de la phase des ondes radio. Il a été démontrée, via des exemples numériques, que le caractére instationnaire de ces quantités influesur la propagation des ondes optiques.

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McCulloch, Catherine Margaret. "Discrete logarithm problem over finite prime fields". Thesis, Queensland University of Technology, 1998. https://eprints.qut.edu.au/36976/1/36976_McCulloch_1988.pdf.

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Difficulty in solving the discrete logarithm problem has led to its use in key exchange, public key cryptography and digital signatures. To measure the security of these algorithms, it is necessary to evaluate the methods currently available for attack. Although the applications of the discrete logarithm problem can be implemented in a variety of different groups, only implementations over multiplicative integers modulo a large prime p are considered. The object of this work is to review the current methods of solving the discrete logarithm problem - key exhaustion, Shanks' baby-step giant-step algorithm, Pollard's rho algorithm, the Silver Pohlig Hellman algorithm, index calculus methods and the general number field sieve. The resulting document contains all relevant mathematics, theorems and algorithms. As only one workstation is used, the problem will not be solved for large primes, but an indication of the relative strengths and weaknesses of each algorithm will be gained. Both the theoretical and practical issues were considered when comparing the attacks available. The algorithms were implemented using the computer algebra system "Magma", which was developed at the University of Sydney. Magma was chosen as it is a flexible package that is not restricted to group theory. The source code is included in Appendix B. The simplest methods to implement are key exhaustion, which relies on testing all possibilities, and the first improvement on this method - Shank's baby-step giant-step algorithm. Both methods are infeasible when the prime number is large. Pollard's rho algorithm, again impractical for large p, has the same expected running time as Shank's baby-step giant-step algorithm, but the storage requirements are negligible. The Silver Pohlig Hellman algorithm which is again impractical for a large p unless p-1 has small factors is also covered. Index calculus methods offer improvements in the time involved to attack the system, once the prime number becomes too large for the earlier methods. Unlike the previous algorithms, the index calculus methods are not generic, they can only be used for particular groups, one of which is the field GF(p ), considered here. The methods involve two parts, a costly precomputation stage that needs to be performed only once for each prime, and the calculation of the individual logarithm. Three methods are investigated - the first by McCurley, the second by Coppersmith, Odlyzko and Schroeppel, and the third by LaMacchia and Odlyzko. By attacking with these methods, primes with fewer than 200 bits are insecure and primes with less than 512 bits should be avoided. By adapting the general number field sieve to solve logarithms, the running time of the attack in some instances can be further improved. Unlike the index calculus methods, the time required for the precomputation and that required for the evaluation of the individual logarithm, are similar. This perhaps reduces the usefulness of the algorithm in the case where the same attack is to be implemented a number of times to determine several different logarithms. If the same prime is to be used for a number of attacks, it may be quicker to use an index calculus method as the precomputation is performed once and then the logarithms can be quickly calculated.

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Książki na temat "STEP-INDEX"

Index funds: The 12-step recovery program for active investors. Irvine, Calif: IFA Pub., 2011.

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Lorenzini, Jean A. Medical phrase index: A one-step reference to the terminology of medicine. Wyd. 2. Oradell, N.J: Medical Economics Books, 1989.

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Lorenzini, Jean A. Medical phrase index: A one-step reference to the terminology of medicine. Wyd. 2. Los Angeles, CA: Practice Management Information Corporation, 1989.

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Butler, Montagu C. Step by step in Esperanto: A textbook for English-speaking students, for class teaching or home study with graduated reading-matter, numerous exercises, and index. Wyd. 9. El Cerrito, Calif: Esperanto League for North America, Inc., 1991.

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Simion, Samuela. Marco Polo, Il Devisement dou monde nella redazione veneziana V (cod. Hamilton 424 della Staatsbibliothek di Berlino). Venice: Edizioni Ca' Foscari, 2019. http://dx.doi.org/10.30687/978-88-6969-321-2.

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The volume contains the commented edition of the Devisement dou monde based on the Berlin Staatsbibliothek - Preußischer Kulturbesitz Codex, Hamilton 424. The Hamilton 424 Codex, transcribed in Venice in the second half of the fifteenth century, contains the translation of a Latin model (whose features can be partially reconstructed virtually starting from some translation errors) and is the only known witness of V. Due to its characteristics, V represents a crucial point in the definition of the transmission dynamics of Polo’s book: its readings are confirmed, often in a broader form, by the Latin version known as Z. V strengthens the hypothesis that, after returning to Venice, Marco Polo modified the text written with Rustichello da Pisa in Genoa. Actually, version V represents the first step of this long process of rewriting, which probably occurred in several phases. This volume includes an introduction, the text edition, a textual commentary, as well as an index. A second and forthcoming volume will contain the linguistic analysis and glossary.

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Marvin, Bittinger. Index Step Succ Vid. Pearson Education, Limited, 1998.

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The Index Fund Solution: A Step-By-Step Investor's Guide. Simon & Schuster, 2000.

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Publish a Source Index: A Step-by-Step Guide to Creating a Genealogically-Useful Index, Abstract or Transcription. Niwot, Colorado, USA: Iron Gate Publishing, 2014.

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Fontanills, George A., i Tom Gentile. Index Trading Course Workbook: Step-By-Step Exercises and Tests to Help You Master the Index Trading Course. Wiley & Sons, Limited, John, 2015.

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Fontanills, George A., i Tom Gentile. Index Trading Course Workbook: Step-by-Step Exercises and Tests to Help You Master the Index Trading Course. Wiley & Sons, Incorporated, John, 2007.

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Części książek na temat "STEP-INDEX"

Weik, Martin H. "step-index fiber". W Computer Science and Communications Dictionary, 1665. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_18242.

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Weik, Martin H. "step-index profile". W Computer Science and Communications Dictionary, 1666. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_18245.

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Pollock, Clifford R., i Michal Lipson. "Step-Index Circular Waveguides". W Integrated Photonics, 73–97. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-5522-0_4.

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Weik, Martin H. "step-index optical fiber". W Computer Science and Communications Dictionary, 1665. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_18243.

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Weik, Martin H. "step-index optical waveguide". W Computer Science and Communications Dictionary, 1666. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_18244.

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Pantchev, B. G., A. G. Kebedjiev i I. T. Savatinova. "Step-Index Profile Microlenses Formed in Glass". W Springer Series in Optical Sciences, 12–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-540-39452-5_4.

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Crandall, Jeff R., James R. Funk, Rodney W. Rudd i Lisa J. Tourret. "The Tibia Index: A Step in the Right Direction". W Human Biomechanics and Injury Prevention, 29–40. Tokyo: Springer Japan, 2000. http://dx.doi.org/10.1007/978-4-431-66967-8_4.

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Yang, Zhen, Yanan Guo, Xiaonan Gong i Yide Ma. "A Non-integer Step Index PCNN Model and Its Applications". W Communications in Computer and Information Science, 780–91. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60964-5_68.

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Atef, Mohamed, i Horst Zimmermann. "High-Speed Transmission over Step-Index PMMA Plastic Optical Fibers". W Optical Communication over Plastic Optical Fibers, 41–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30388-3_4.

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Oliveira, Pedro, Bruno Fernandes, Cesar Analide i Paulo Novais. "Multi-step Ultraviolet Index Forecasting Using Long Short-Term Memory Networks". W Advances in Intelligent Systems and Computing, 187–97. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53036-5_20.

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Streszczenia konferencji na temat "STEP-INDEX"

Gavrilov, Andrey V., Sergey V. Karpeev, Nikolay L. Kazanskiy, Vladimir S. Pavelyev, Michael Duparré, Barbara Luedge i S. Schroeter. "Selective excitation of step-index fiber modes". W SPIE Proceedings, redaktorzy Vladimir A. Andreev, Vladimir A. Burdin i Albert H. Sultanov. SPIE, 2007. http://dx.doi.org/10.1117/12.728461.

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da Silva, J. P., V. F. Rodriguez-Esquerre i H. E. Hernadez-Figueroa. "Coupling characteristics of step index holey fiber". W International Microwave and Optoelectronics Confererence. IEEE, 2007. http://dx.doi.org/10.1109/imoc.2007.4404256.

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Wright, Logan G., Adrien Fusaro, Antonio Picozzi, Demetrios N. Christodoulides i Frank W. Wise. "Spatiotemporal Complexity in Step-Index Multimode Fibers". W Nonlinear Photonics. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/np.2016.nw4a.3.

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Stechel, Ellen B. "Laser-induced damage in step-index multimode fibers". W Optical Materials for High Power Lasers, redaktorzy Harold E. Bennett, Lloyd L. Chase, Arthur H. Guenther, Brian E. Newnam i M. J. Soileau. SPIE, 1993. http://dx.doi.org/10.1117/12.147423.

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Stechel, Ellen B., Kent D. Meeks, Wayne M. Trott, Paul E. Klingsporn i Dante M. Berry. "High-power transmission through step-index multimode fibers". W Boulder - DL tentative, redaktorzy Harold E. Bennett, Lloyd L. Chase, Arthur H. Guenther, Brian E. Newnam i M. J. Soileau. SPIE, 1991. http://dx.doi.org/10.1117/12.57217.

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Leskova, Tamara A., Alexei A. Maradudin i Wolfgang Zierau. "Surface plasmon polariton propagation near an index step". W International Symposium on Optical Science and Technology, redaktorzy Zu-Han Gu i Alexei A. Maradudin. SPIE, 2000. http://dx.doi.org/10.1117/12.401646.

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Spittel, Ron, Adrian Lorenz, Sylvia Jetschke, Matthias Jäger i Hartmut Bartelt. "Equivalent step-index model of multifilament core fibers". W SPIE OPTO, redaktorzy Jean Emmanuel Broquin i Gualtiero Nunzi Conti. SPIE, 2013. http://dx.doi.org/10.1117/12.2001879.

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Das, Alok K., Amar K. Ganguly i Ardhendu Saha. "Multilayered step index microlens of low spherical aberration". W Photonics China '98, redaktorzy Qiming Xin i Robert E. Parks. SPIE, 1998. http://dx.doi.org/10.1117/12.318334.

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Lian, Xiaokang, Gerald Farrell, Qiang Wu, Wei Han, Fangfang Wei i Yuliya Semenova. "Mode Transition in Conventional Step-Index Optical Fibers". W 2019 18th International Conference on Optical Communications and Networks (ICOCN). IEEE, 2019. http://dx.doi.org/10.1109/icocn.2019.8934113.

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Karim, Douglas P. "Multimode dispersion in step-index polymer optical fibers". W Fibers '92, redaktorzy Luis Figueroa, Mototaka Kitazawa, Norris E. Lewis, Robert E. Steele i Deepak Varshneya. SPIE, 1993. http://dx.doi.org/10.1117/12.141366.

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Raporty organizacyjne na temat "STEP-INDEX"

Ostashev, Vladimir, Michael Muhlestein i D. Wilson. Extra-wide-angle parabolic equations in motionless and moving media. Engineer Research and Development Center (U.S.), wrzesień 2021. http://dx.doi.org/10.21079/11681/42043.

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Wide-angle parabolic equations (WAPEs) play an important role in physics. They are derived by an expansion of a square-root pseudo-differential operator in one-way wave equations, and then solved by finite-difference techniques. In the present paper, a different approach is suggested. The starting point is an extra-wide-angle parabolic equation (EWAPE) valid for small variations of the refractive index of a medium. This equation is written in an integral form, solved by a perturbation technique, and transformed to the spectral domain. The resulting split-step spectral algorithm for the EWAPE accounts for the propagation angles up to 90° with respect to the nominal direction. This EWAPE is also generalized to large variations in the refractive index. It is shown that WAPEs known in the literature are particular cases of the two EWAPEs. This provides an alternative derivation of the WAPEs, enables a better understanding of the underlying physics and ranges of their applicability, and opens an opportunity for innovative algorithms. Sound propagation in both motionless and moving media is considered. The split-step spectral algorithm is particularly useful in the latter case since complicated partial derivatives of the sound pressure and medium velocity reduce to wave vectors (essentially, propagation angles) in the spectral domain.

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Weller, Joel I., Ignacy Misztal i Micha Ron. Optimization of methodology for genomic selection of moderate and large dairy cattle populations. United States Department of Agriculture, marzec 2015. http://dx.doi.org/10.32747/2015.7594404.bard.

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The main objectives of this research was to detect the specific polymorphisms responsible for observed quantitative trait loci and develop optimal strategies for genomic evaluations and selection for moderate (Israel) and large (US) dairy cattle populations. A joint evaluation using all phenotypic, pedigree, and genomic data is the optimal strategy. The specific objectives were: 1) to apply strategies for determination of the causative polymorphisms based on the “a posteriori granddaughter design” (APGD), 2) to develop methods to derive unbiased estimates of gene effects derived from SNP chips analyses, 3) to derive optimal single-stage methods to estimate breeding values of animals based on marker, phenotypic and pedigree data, 4) to extend these methods to multi-trait genetic evaluations and 5) to evaluate the results of long-term genomic selection, as compared to traditional selection. Nearly all of these objectives were met. The major achievements were: The APGD and the modified granddaughter designs were applied to the US Holstein population, and regions harboring segregating quantitative trait loci (QTL) were identified for all economic traits of interest. The APGD was able to find segregating QTL for all the economic traits analyzed, and confidence intervals for QTL location ranged from ~5 to 35 million base pairs. Genomic estimated breeding values (GEBV) for milk production traits in the Israeli Holstein population were computed by the single-step method and compared to results for the two-step method. The single-step method was extended to derive GEBV for multi-parity evaluation. Long-term analysis of genomic selection demonstrated that inclusion of pedigree data from previous generations may result in less accurate GEBV. Major conclusions are: Predictions using single-step genomic best linear unbiased prediction (GBLUP) were the least biased, and that method appears to be the best tool for genomic evaluation of a small population, as it automatically accounts for parental index and allows for inclusion of female genomic information without additional steps. None of the methods applied to the Israeli Holstein population were able to derive GEBV for young bulls that were significantly better than parent averages. Thus we confirm previous studies that the main limiting factor for the accuracy of GEBV is the number of bulls with genotypes and progeny tests. Although 36 of the grandsires included in the APGD were genotyped for the BovineHDBeadChip, which includes 777,000 SNPs, we were not able to determine the causative polymorphism for any of the detected QTL. The number of valid unique markers on the BovineHDBeadChip is not sufficient for a reasonable probability to find the causative polymorphisms. Complete resequencing of the genome of approximately 50 bulls will be required, but this could not be accomplished within the framework of the current project due to funding constraints. Inclusion of pedigree data from older generations in the derivation of GEBV may result is less accurate evaluations.

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Chen, Pictiaw, Boaz Zion i Michael J. McCarthy. Utilization of NMR Technology for Internal Nondestructive Quality Evaluation of Fruits and Vegetables. United States Department of Agriculture, wrzesień 1994. http://dx.doi.org/10.32747/1994.7568778.bard.

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Objective: The objective of this research was to investigate the potential use of NMR for evaluating various internal quality factors of fruits and vegetables, leading to the eventual development of practical techniques that are useful for future development of NMR sensors. Summary: Investigation on NMR imaging, one-dimension NMR projection, and single-pulse free-induction-decay (FID) spectrum led to the development of high-speed NMR techniques for real-time sensing of internal quality of selected fruits. NMR imaging can be used for detecting internal defects and various quality factors such as bruises, dry regions, worm damage, stage of ripeness, tissue breakdown, and the presence of voids, seeds, sprouts, and pits. The one-dimension (1-D) image profile technique, in which the 1-D projection of the NMR signal of a selected slice of the intact fruit is recorded, is suitable for detecting tissue breakdown regions, presence of pits, and other defects in fruits. The oil and sugar content of fruits can be determined from the single-pulse FID spectrum measurement, in which a surface coil is used to acquire the FID spectrum and the ratio of the resonance peaks is used as the quality index. The latter two techniques are suitable for high-speed sorting of fruits. The most important accomplishment is the successful development of high-speed NMR techniques for determining internal quality of fruits while they are moving at speed up to 30 cm/s. This accomplishment is an important step toward the development of NMR techniques for on-line sorting of fruits and vegetables.

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Osadchyi, Viacheslav V., Hanna B. Varina, Kateryna P. Osadcha, Olha V. Kovalova, Valentyna V. Voloshyna, Oleksii V. Sysoiev i Mariya P. Shyshkina. The use of augmented reality technologies in the development of emotional intelligence of future specialists of socionomic professions under the conditions of adaptive learning. CEUR Workshop Proceedings, lipiec 2020. http://dx.doi.org/10.31812/123456789/4633.

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In modern conditions, innovative augmented reality technologies are actively developing, which are widespread in many areas of human activity. Introduction of advanced developments in the process of professional training of future specialists of socionomic professions in the conditions of adaptive training, contributes to the implementation of the principles of a personalized approach and increase the overall level of competitiveness. The relevant scientific article is devoted to the theoretical and empirical analysis result of conducting a psychodiagnostic study on an innovative computer complex HC-psychotest. of the features of the implementation of augmented reality technologies in the construct of traditional psychological and pedagogical support aimed at the development of emotional intelligence of the future specialist. The interdisciplinary approach was used while carrying out the research work at the expense of the general fund of the state budget: “Adaptive system for individualization and personalization of professional training of future specialists in the conditions of blended learning”. A comprehensive study of the implementation of traditional psychological-pedagogical and innovative augmented reality technologies was conducted in the framework of scientific cooperation of STEAM-Laboratory, Laboratory of Psychophysiological Research and Laboratory of Psychology of Health in Bogdan Khmelnitsky Melitopol State Pedagogical University. The theoretical analysis considers the structural model of emotional intelligence of the future specialist of socionomic professions, which is represented by two structural components: intrapersonal construct of emotional intelligence and interpersonal construct of emotional intelligence. Each component mediates the inherent emotional intelligence of interpretive, regulatory, adaptive, stress-protective and activating functions. The algorithm of the empirical block of research is presented by two stages: ascertaining and forming research. According to the results of the statement, low indicators were found on most scales, reflecting the general level of emotional intelligence development of future specialists, actualizing the need to find and implement effective measures for the development of emotional intelligence components in modern higher education and taking into account information development and digitalization. As part of the formative stage of the research implementation, a comprehensive program “Development of emotional intelligence of future professionals” was tested, which integrated traditional psychological and pedagogical technologies and innovative augmented reality technologies. This program is designed for 24 hours, 6 thematic classes of 4 hours. According to the results of a comprehensive ascertaining and shaping research, the effectiveness of the influence of augmented reality technologies on the general index of emotional intelligence is proved. The step-by-step model of integration of augmented reality components influencing the ability to analyze, understand and regulate emotional states into a complex program of emotional intelligence development is demonstrated. According to the results of the formative study, there is a dominance of high indicators of the following components: intrapersonal (50%), interpersonal (53.3%). Thus, we can say that intrapersonal and interpersonal emotional intelligence together involve the actualization of various cognitive processes and skills, and are related to each other. Empirical data were obtained as a

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Steudlein, Armin, Besrat Alemu, T. Matthew Evans, Steven Kramer, Jonathan Stewart, Kristin Ulmer i Katerina Ziotopoulou. PEER Workshop on Liquefaction Susceptibility. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, maj 2023. http://dx.doi.org/10.55461/bpsk6314.

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Seismic ground failure potential from liquefaction is generally undertaken in three steps. First, a susceptibility evaluation determines if the soil in a particular layer is in a condition where liquefaction triggering could potentially occur. This is followed by a triggering evaluation to estimate the likelihood of triggering given anticipated seismic demands, environmental conditions pertaining to the soil layer (e.g., its depth relative to the ground water table), and the soil state. For soils where triggering can be anticipated, the final step involves assessments of the potential for ground failure and its impact on infrastructure systems. This workshop was dedicated to the first of these steps, which often plays a critical role in delineating risk for soil deposits with high fines contents and clay-silt-sand mixtures of negligible to moderate plasticity. The workshop was hosted at Oregon State University on September 8-9, 2022 and was attended by 49 participants from the research, practice, and regulatory communities. Through pre-workshop polls, extended abstracts, workshop presentations, and workshop breakout discussions, it was demonstrated that leaders in the liquefaction community do not share a common understanding of the term “susceptibility” as applied to liquefaction problems. The primary distinction between alternate views concerns whether environmental conditions and soil state provide relevant information for a susceptibility evaluation, or if susceptibility is a material characteristic. For example, a clean, dry, dense sand in a region of low seismicity is very unlikely to experience triggering of liquefaction and would be considered not susceptible by adherents of a definition that considers environmental conditions and state. The alternative, and recommended, definition focusing on material susceptibility would consider the material as susceptible and would defer consideration of saturation, state, and loading effects to a separate triggering analysis. This material susceptibility definition has the advantage of maintaining a high degree of independence between the parameters considered in the susceptibility and triggering phases of the ground failure analysis. There exist differences between current methods for assessing material susceptibility – the databases include varying amount of test data, the materials considered are distinct (from different regions) and have been tested using different procedures, and the models can be interpreted as providingdifferent outcomes in some cases. The workshop reached a clear consensus that new procedures are needed that are developed using a new research approach. The recommended approach involves assembling a database of information from sites for which in situ test data are available (borings with samples, CPTs), cyclic test data are available from high-quality specimens, and a range of index tests are available for important layers. It is not necessary that the sites have experienced earthquake shaking for which field performance is known, although such information is of interest where available. A considerable amount of data of this type are available from prior research studies and detailed geotechnical investigations for project sites by leading geotechnical consultants. Once assembled and made available, this data would allow for the development of models to predict the probability of material susceptibility given various independent variables (e.g., in-situ tests indices, laboratory index parameters) and the epistemic uncertainty of the predictions. Such studies should be conducted in an open, transparent manner utilizing a shared database, which is a hallmark of the Next Generation Liquefaction (NGL) project.

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