Gotowe bibliografie tematyczne / Stability of refraction

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Gotowa bibliografia na temat „Stability of refraction”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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Artykuły w czasopismach na temat "Stability of refraction"

Lee, Ji Hye, and Yang Kyung Cho. "Assessing Refractive Stability after Cataract Surgery in Axial Myopes: One-piece and Three-piece Intraocular Lenses." Journal of the Korean Ophthalmological Society 63, no. 2 (2022): 150–59. http://dx.doi.org/10.3341/jkos.2022.63.2.150.

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Purpose: To assess the refractive changes and stability after cataract surgery with insertion of three different intraocular lenses in axial myopes.Methods: A retrospective analysis was performed with 44 eyes of normal axial length (22.0 mm < axial length ≤ 24.5 mm) and 49 eyes of long axial length (24.5 mm < axial length) in patients who underwent phacoemulsification and posterior chamber lens insertion. Automated keratometry examination and refraction were performed using an autorefractor keratometer; A-scan ultrasound was used to calculate target refraction. One-piece intraocular lens

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Quito, Carmina Franz G., Archimedes Lee D. Agahan, and Raymond P. Evangelista. "Long-Term Followup of Laser In Situ Keratomileusis for Hyperopia Using a 213 nm Wavelength Solid-State Laser." ISRN Ophthalmology 2013 (March 3, 2013): 1–7. http://dx.doi.org/10.1155/2013/276984.

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Purpose. To evaluate the long-term efficacy, accuracy, stability, and safety of hyperopic laser in situ keratomileusis (LASIK) using a 213 nm wavelength solid-state laser. Methods. This prospective noncomparative case series consisted of 34 eyes of 17 patients which underwent hyperopic LASIK using a 213 nm solid-state laser (Pulzar Z1, CustomVis) at an outpatient refractive surgery center in Manila, Philippines. The preoperative and postoperative examinations included uncorrected distance visual acuity (UDVA), subjective manifest refraction, corrected distance visual acuity (CDVA), cycloplegic

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Dietze, Holger, and Marina Kruse. "Postoperative Stabilität der Refraktion nach Katarakt-Operation." Optometry & Contact Lenses 1, no. 1 (2021): 14–20. http://dx.doi.org/10.54352/dozv.oeec9554.

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Aim. The goal of the present study is to determine how much time must pass after a cataract surgery with no complications to achieve a sufficiently stable refraction. Subjects and methods. We measured the postoperative refraction of 61 pseudophakic subjects (mean age: 74.32 ± 7.11 years) five times with an autorefractor. The subjects had undergone unilateral cataract surgery and the time intervals for the measurement went from one day to eight weeks after the operation. In order to obtain the spherical equiva- lent (SE) and the cylinder power, the difference from each measurement and the last

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Huang, Yu-Yan, Guo-Fu Chen, Duo Peng, Miao-Zhen Pan, Ji-Bo Zhou, and Jia Qu. "Refractive status and histological changes after posterior scleral reinforcement in guinea pig." International Journal of Ophthalmology 18, no. 3 (2025): 375–82. https://doi.org/10.18240/ijo.2025.03.01.

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AIM: To investigate the refractive and the histological changes in guinea pig eyes after posterior scleral reinforcement with scleral allografts. METHODS: Four-week-old guinea pigs were implanted with scleral allografts, and the changes of refraction, corneal curvature and axis length were monitored for 51d. The effects of methylprednisolone (MPS) on refraction parameters were also evaluated. And the microstructure and ultra-microstructure of eyes were observed on the 9d and 51d after operation. Repeated-measures analysis of variance and one-way analysis of variance were used. RESULTS: The ref

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Lalramhluni, Regina, Soveeta Rath, Ankita Shrivastav, et al. "Refractive and Visual Outcomes after Scleral Fixated Intraocular Lens Implantation in Children with Ectopia Lentis." Nepalese Journal of Ophthalmology 12, no. 1 (2020): 75–82. http://dx.doi.org/10.3126/nepjoph.v12i1.22252.

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Introduction: This study was conducted to report the refractive and visual outcome after Scleral Fixated Intraocular Lens (SFIOL) implantation in children with nontraumatic ectopia lentis. Methods: Retrospective review of the medical records of 25 eyes of 15 patients who underwent SFIOL implantation in children with non-traumatic ectopia lentis. Results: The mean best corrected visual acuity (BCVA) before SFIOL implantation was 1.07 ± 0.9 logMar units [median: 0.9, Interquartile range (ΙQR): 0.415 to 1.555] which improved to 0.41 ± 0.33 logMar units (median: 0.22, ΙQR: 0.180 to 1.5

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Yingmei, Jiang, Jin Tao, Yang Xueqi, et al. "An Analysis on the Change Rule of Eyeball's Biological Parameters of Different Types in the Refraction State and Vision Before and After Refraction." Journal of Medical Imaging and Health Informatics 8, no. 9 (2018): 1881–85. http://dx.doi.org/10.1166/jmihi.2018.2532.

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The ametropia is the most widespread eye disease for the humans. Wherein, the myopia is the commonest ophthalmological reason influencing the distant vision. The excimer laser corneal refractive surgery has always been an operation mode most widely used in myopic correction operations for a number of years. The laser assisted in-situ keratomi (LASIK) mainly transforms the frontal surface appearance of the cornea to change the corneal refraction power, and its correction effect is influenced by a great many factors such as regression and hydration of cornea. Thus, a lot of surgeons would combin

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Huang, Chien Jung, Kuo Chien Liao, and Yan Kuin Su. "Structure Property of Titanium Dioxide Thin Films in Sintered Temperature by the Sol-Gel Method." Key Engineering Materials 368-372 (February 2008): 1465–67. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1465.

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Titanium dioxide (TiO2) thin film on glass substrate is fabricated by sol-gel method. The TiO2 film is sintered at various temperatures for investigation on the refraction index and crystallization characteristic. The lower refractive index of the TiO2 thin film is 1.89 when the sintering is performed at the low temperature of 200°C and the thickness is 448 nm. However, the higher refractive index of 2.55 and chemical stability of the TiO2 film in rutile phase are obtained via sintering temperature at 700°C.

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Sayegh, Fouad N. "Age and Refraction in 46,000 Patients as a Potential Predictor of Refractive Stability After Refractive Surgery." Journal of Refractive Surgery 25, no. 8 (2009): 747–51. http://dx.doi.org/10.3928/1081597x-20090707-10.

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Hu, Dian, and Wancheng Sheng. "Stability of E-H type regular shock refraction." Journal of Mathematical Physics 59, no. 11 (2018): 111504. http://dx.doi.org/10.1063/1.5054686.

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Willcocks, Simon, Derrick Hasterok, and Samuel Jennings. "Thermal refraction: implications for subglacial heat flux." Journal of Glaciology 67, no. 265 (2021): 875–84. http://dx.doi.org/10.1017/jog.2021.38.

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AbstractIn this study, we explore small-scale (~1 to 20 km) thermal-refractive effects on basal geothermal heat flux (BGHF) at subglacial boundaries resulting from lateral thermal conductivity contrasts associated with subglacial topography and geologic contacts. We construct a series of two-dimensional, conductive, steady-state models that exclude many of the complexities of ice sheets in order to demonstrate the effect of thermal refraction. We show that heat can preferentially flow into or around a subglacial valley depending on the thermal conductivity contrast with underlying bedrock, wit

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Rozprawy doktorskie na temat "Stability of refraction"

Silva, Sinhara Rishi Malinda. "Manipulating Electromagnetic waves with enhanced functionalities using Nonlinear and Chiral Metamaterials." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7443.

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Metamaterials are artificial structures, which periodically arranged to exhibit fascinating electromagnetic properties, not existing in nature. A great deal of research in the field of metamaterial was conducted in a linear regime, where the electromagnetic responses are independent of the external electric or magnetic fields. Unfortunately, in linear regime the desired properties of metamaterials have only been achieved within a narrow bandwidth, around a fixed frequency. Therefore, nonlinearity is introduced into metamaterials by merging meta-atoms with well-known nonline

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Iazzolino, Antonio. "Engineering three-dimensional extended arrays of densely packed nano particles for optical metamaterials using microfluidIque evaporation." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-01059235.

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1-Microevaporation - Microfluidics is the branch of fluid mechanics dedicated to the study of flows in the channel withdimensions between 1 micron and 100 micron. The object of this chapter is to illustrate the basicprinciples and possible applications of microfluidic chip, called microevaporator. In the first part ofthe chapter, we present a detailed description of the physics of microevaporators using analyticalarguments, and describe some applications. In the second part of the chapter, we present theexperimental protocol of engineering of micro evaporator and different type of microfluidic

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Anand, Vijay, John G. Buckley, Andy J. Scally, and David B. Elliott. "Postural stability changes in the elderly with cataract simulation and refractive blur." Association for Research in Vision and Ophthalmology (ARVO), 2003. http://hdl.handle.net/10454/4137.

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PURPOSE. To determine the influence of cataractous and refractive blur on postural stability and limb-load asymmetry (LLA) and to establish how postural stability changes with the spatial frequency and contrast of the visual stimulus. METHODS. Thirteen elderly subjects (mean age, 70.76 ± 4.14 [SD] years) with no history of falls and normal vision were recruited. Postural stability was determined as the root mean square [RMS] of the center of pressure (COP) signal in the anterior¿posterior (A-P) and medial¿lateral directions and LLA was determined as the ratio of the average body weight place

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Alderson, Alison J. "Structural and functional aspects of myopia in young adults. An investigation of nearwork-induced transient myopia and accommodation in relation to refractive stability." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5518.

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This thesis has investigated nearwork-induced transient myopia and accommodation responses in relation to refractive stability, multichromatic stimuli and orthokeratology. Five individual studies have been carried out. Initially an investigation into the temporal and dioptric aspects of nearwork-induced transient myopia was undertaken, suggesting that increased task duration does not increase the level, or slow the regression of post-task NITM, however an increase in the dioptric demand of the task does. In the second study, a longitudinal myopia progression study, these findings were related

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Alderson, Alison. "Structural and functional aspects of myopia in young adults : an investigation of nearwork-induced transient myopia and accommodation in relation to refractive stability." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5518.

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Armstrong, Deborah. "The Role of vision and refractive correction changes in dizziness." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/16956.

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Dizziness is a common, multifactorial problem that causes reductions in quality of life and is a major risk factor for falls, but the role of vision is a very under-researched area. This study aimed to investigate any link between dizziness and vision and to establish if changes in spectacle lens correction could elicit dizziness symptoms. A link between dizziness and self-reported poor vision was indicated in the epidemiological literature as shown by a systematic review, provided lightheadedness was not included in the definition of dizziness. Cases of individuals who reported vision

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Rasmussen, Winola Lenore. "Novel Carbazole Based Methacrylates, Acrylates, and Dimethacrylates to Produce High Refractive Index Polymers." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/30181.

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Homopolymers and copolymers produced from aromatic based methacrylates, acrylates, and dimethacrylates are excellent materials with many applications in dentistry, microelectronics, and optics, including optical eye wear, fiber optics, and non-linear optics, such as holography. Carbazole based polymers have demonstrated good optical, photo-refractive, and charge-transporting properties, combined with ease of processing. The objective of this research was to design, synthesize, and characterize high refractive index polymers and copolymers for use in optical spectacle lenses of eyeglasses. A

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Charlesworth, Emily, Alison J. Alderson, Juan V. de, and David B. Elliott. "When is refraction stable following routine cataract surgery? A systematic review and meta-analysis." 2020. http://hdl.handle.net/10454/18289.

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Yes Purpose: We systematically reviewed the literature to investigate when refraction is stable following routine cataract surgery implanting monofocal intraocular lenses. Current advice recommends obtaining new spectacles 4–6 weeks following surgery. Due to advancements in surgical techniques, we hypothesised that refractive stability would be achieved earlier, which could have major short-term improvements in quality of life for patients. Methods: Medline, CINAHL, AMED, Embase, Web of Science and the Cochrane Library were searched with key words chosen to find articles, which assessed ref

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Anand, Vijay, John G. Buckley, Andy J. Scally, and David B. Elliott. "The effect of refractive blur on postural stability." 2002. http://hdl.handle.net/10454/6415.

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The effect of refractive blur upon postural stability was investigated under three conditions: normal standing, standing with input from the somatosensory system disrupted and standing with input from the somatosensory and vestibular systems disrupted. Standing stability was assessed using the centre of pressure (COP) signal from force plate data in four young subjects (mean 23.9 ± 3.1 years) and five repeated sets of measurements were taken. The subjects looked straight ahead at a horizontal and vertical square wave pattern of 2.5 cycles (degree)¿1. Under each of the three test conditions, st

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Lu, Xuan-Yi, and 呂宣毅. "A Stable Packaged Microfiber Coil Resonator for Refractive Index Sensing and Its Long-term Stability Improvement." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/zvc56h.

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碩士 國立臺灣大學 光電工程學研究所 105 Recently, microfiber coil resonators (MCR) have attracted much attention in nonlinear optics and optical sensing. Compared with the semiconductor based micro resonators, MCRs have attractive properties such as low propagation loss and easy connection with conventional optical fiber devices through their tapered sections. Moreover, by increasing coil turns or stacking microfiber turns, MCRs can achieve very high quality factor. However, an unpackaged MCR is easily affected by surrounding disturbance, which limits its applications. Therefore the methods to prot

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Książki na temat "Stability of refraction"

Gossard, Earl E. The relationship of temperature and velocity variance to atmospheric thermal stability. U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1986.

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Gossard, Earl E. The stability of a shear model in which perturbations move with the mean local flow. U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1986.

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S, Jacobson Nathan, Miller Robert A, and Lewis Research Center, eds. Thermal-mechanical stability of single crystal oxide refractive concentrators for high-temperature solar thermal propulsion. National Aeronautics and Space Administration, Lewis Research Center, 1999.

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National Aeronautics and Space Administration (NASA) Staff. Thermal-Mechanical Stability of Single Crystal Oxide Refractive Concentrators for High-Temperature Solar Thermal Propulsion. Independently Published, 2018.

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Thermal-mechanical stability of single crystal oxide refractive concentrators for high-temperature solar thermal propulsion. National Aeronautics and Space Administration, Lewis Research Center, 1999.

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Części książek na temat "Stability of refraction"

Hamlyn, Joanna. "Case: geophysical investigation of slope stability using electrical resistivity tomography, seismic refraction, and surface waves." In Engineering Geophysics. CRC Press, 2022. http://dx.doi.org/10.1201/9781003184676-33.

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Hemeda, Sayed. "Determination of Shear-Wave Velocity to 30 m Depth from Refraction Microtremor Arrays (Remi-Test). Applied in Some Greek-Roman Archaeological Sites in Alexandria, Egypt." In Sustainable Thoughts in Ground Improvement and Soil Stability. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-34184-8_1.

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DESCHAMPS, MARC. "REFLECTION AND REFRACTION OF THE INHOMOGENEOUS PLANE WAVE." In Series on Stability, Vibration and Control of Systems, Series B. WORLD SCIENTIFIC, 1996. http://dx.doi.org/10.1142/9789812830593_0006.

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Bohac, Maja, Mateja Jagic, Doria Gabric, Lucija Zerjav, Smiljka Popovic Suic, and Iva Dekaris. "Modern Refractive Lenticular Femtosecond Laser Corneal Surgery for Correction of Myopia and Myopic Astigmatism." In Refractive Surgery - Types of Procedures, Risks, and Benefits [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105159.

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Small-incision lenticule extraction (SMILE) is becoming the procedure of choice in treating myopia and myopic astigmatism. With great comparability in terms of visual outcome with the femtosecond laser-assisted in situ keratomileusis (FsLASIK) procedure, the method is characterized by better patient satisfaction and less postoperative dry eye induction. Moreover, it has the advantages of better eye surface stability and biomechanical strength compared to FS-LASIK. The method is now globally accepted among refractive surgeons. Patients suitable for the procedure must meet criteria for keratoref

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Boiago, Nayra Parisoto, Silvia Renata Machado Coelho, and Gabriel Beledeli Camello. "EFFICIENCY OF TWO MICRO EXTRUDERS AND PHYSICOCHEMICAL CHANGES IN FLAXSEED BY-PRODUCTS." In Open Science Research XII. Editora Científica Digital, 2023. http://dx.doi.org/10.37885/230613391.

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Objective: This study aimed to evaluate and compare the efficiency of flaxseed oil extraction by two micro extruders of low capacity with different mechanisms of extraction, as well as the effect on physicochemical quality of the press cake and flaxseed oil obtained in this process. Methods: The experiment was conducted in a randomized block design. For samples of grain and press cake we evaluated the variables percentage of lipid, protein and water content. Therefore, in oil, we evaluated the acid content, refractive index, color and oxidative stability of the induction period. Results: Data

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Kopacz, Dorota, Łucja Niezgoda, Ewa Fudalej, Anna Nowak, and Piotr Maciejewicz. "Tear Film – Physiology and Disturbances in Various Diseases and Disorders." In Ocular Surface Diseases - Some Current Date on Tear Film Problem and Keratoconic Diagnosis. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.94142.

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The tear film is a thin fluid layer covering the ocular surface. It is responsible for ocular surface comfort, mechanical, environmental and immune protection, epithelial health and it forms smooth refractive surface for vision. The traditional description of the tear film divides it into three layers: lipid, aqueous and mucin. The role of each layer depends on the composition of it. Tear production, evaporation, absorption and drainage concur to dynamic balance of the tear film and leads to its integrity and stability. Nonetheless, this stability can be disturb in tear film layers deficiencie

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Saktioto, Toto, Yoli Zairmi, Sopya Erlinda, and Velia Veriyanti. "Simulation of Birefringence and Polarization Mode Dispersion Characteristics in Various Commercial Single Mode Fibers." In Application of Optical Fiber in Engineering. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.94127.

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Single mode optical fiber operation for long haul distance communication media has rapidly developed. Several efforts are implemented to reduce and control the attenuation and absorption of signal propagation. However, fiber parameters still experienced interference with internal and external factors that result birefringence and polarization mode dispersion such as bending power losses, signal widening and increasing wavelengths. In order to reduce and optimize the interference which is experimentally difficult to demonstrate because of the very long fibers hence a numerical simulation is set

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Revathi, Mrs R., and P. Ajithsivam. "SYNTHESIS AND CHARACTERIZATION OF POLYSTYRENE / TITANIUM DIOXIDE (PS/TIO2) NANO COMPOSITES." In Futuristic Trends in Chemical Material Sciences & Nano Technology Volume 3 Book 11. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3becs11p2ch3.

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Titanium dioxide is of very high technical importance due to its excellent electrical, optical, and chemical properties such as no toxicity, transparency in visible light, wide gap energy, high refractive index, electrochemical stability, and good insulation properties. The PS/TiO2 Nano composite was synthesized by Sol-Gel method and the gel were coated in substrate by doctor blade coating method. Polymer has been used since they have beneficial properties like Biodegradability and Biocompatibility. The characterization studies such as XRD, FTIR, SEM-EDX were carried out for the nanocomposite

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Jayalakshmi, V., and G. Jaiganesh. "FIRST-PRINCIPLE CALCULATIONS OF PRESSURE-INDUCED CHANGES IN STRUCTURAL, ELECTRONIC, AND OPTICAL PROPERTIES OF CUMX2 (M = GA, IN; X = S, SE, TE) CHALCOPYRITES." In Futuristic Trends in Chemical Material Sciences & Nano Technology Volume 3 Book 4. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3becs4p2ch6.

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In this study, we investigate the electronic structure, structural phase stability, and optical properties of CuMX2 chalcopyrite semiconductors (M = Ga, In; X = S, Se, Te) using the self- consistent linear muffin-tin orbital method (LMTO) within the local density approximation (LDA). The total energies and equilibrium lattice constants are computed as a function ofreduced volume using the tight-binding version of LMTO (TB-LMTO). The chalcopyrites undergo a structural phase transition from BCT (Chalcopyrite) to face-centered cubic phase (FCC) under high pressure, with the BCT phase being more e

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Walsh, B. M. "Rare Earth Glass Spectroscopy and Fiber Lasers." In Materials Research Foundations. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903056-1.

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The ability to make new materials is often key to major progress in fundamental physics and numerous applications. This is the focus of our research. Therefore, we have synthesized a novel glass compositions doped with erbium. Glasses based on antimony oxide (Sb2O3) make one of the major classes of heavy metal oxide glasses, which have specific properties such as low phonon energy, a high non-linearity associated with a high refractive index, good mechanical properties, and better stability than that fluoride and tellurite glasses. They present the advantage to be easy to elaborate at a low pr

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Streszczenia konferencji na temat "Stability of refraction"

Liu, Junze, Lloyd Lobo, Hang Yang, et al. "Extended OCT depth range and phase stability using ultrasonically-sculpted optical waveguides." In CLEO: Applications and Technology. Optica Publishing Group, 2024. https://doi.org/10.1364/cleo_at.2024.jtu2a.187.

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Optical coherence tomography (OCT) can provide label-free cross-sectional imaging of tissue microstructure over 2-3 mm of depth with micron-scale resolution. While phase-based functional extensions including angiography and polarization-sensitive OCT greatly expand the utility of OCT, the fixed lenses typically used to focus light into a sample couples the lateral resolution with the depth of focus. Ultrasonically-sculpted virtual optical waveguides provides an alternative for the terminal focusing element in an OCT sample arm. Ultrasonic pressure applied to a medium modulates its refractive i

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Santos, P., D. Cunha, C. Bastos, A. Lima, and R. Moura. "Seismic Refraction Applied to Weathering Thickness Characterization and Slope Stability in NW Portugal." In Near Surface 2007 - 13th EAGE European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2007. http://dx.doi.org/10.3997/2214-4609.20146684.

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Williams, Forrest L., D. W. Reicher, J. J. McNally, G. A. Al-Jumaily, and J. R. McNeil. "Ion Assisted Deposition of Optical Coatings at Low Temperature." In Optics in Adverse Envirornments. Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oae.1987.thb5.

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The heavy metal fluoride (HMF) glasses are a new class of optically useful but environmentally unstable materials. These materials possess desirable optical properties, including a broad transmittance range from the mid-IR (~7 μm) to the near-UV (~0.3 μm), low absorption and scatter losses, low dispersion, low index of refraction and low thermal distortion.1 However, despite their promising optical characteristics, many HMF compositions are hygroscopic and relatively soft. Thus, hermetic coatings are required that will protect HMF glasses without degrading their optical properties. The problem

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Atanassov, George, Cheng-Chung Lee, Valentine Dimitrova, and Yisheng Dai. "Properties of AIN thin films deposited by various techniques." In Optical Interference Coatings. Optica Publishing Group, 1997. http://dx.doi.org/10.1364/oic.1998.mb.6.

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AIN material is well known with its high band gap, electroinsulating and piezoelectric properties, chemical stability, hardness and high decompoition temperature [1]. AIN thin films find large application in microelectronics and optoelectronics. They are good thermal conductors and resistant to thermal shocks [2], So far they do not find large application in optical coatings due to the technological difficulties in their production and large compressive stress. The films are subjected to oxidizing during heating under ambient air, which leads to reducing their refractive index and change of th

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Blattner, P., H. P. Herzig, and K. J. Weible. "Diffractive Optical Elements for Tracking and Receiving in Optical Space Communication Systems." In Diffractive Optics and Micro-Optics. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/domo.1996.jtub.8.

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The design of first, generation free space laser communication systems is based on laser diodes with output powers in the order of 100 mW [1]. The data rate transmission is in the order of 100 Mbit/s. This leads to terminals with large transmitter and receiver telescope diameters and, consequently, to high terminal mass and dimensions. The optical systems are usually designed with refractive lenses and reflective mirrors. Alternatives are planar diffractive optical elements (DOEs). By relying on diffraction and interference rather than on reflection and refraction, unique and novel properties

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Wang, J. "Unlocking the potential of conventional narrow azimuth data by full-waveform inversion: a deep carbonate imaging case study, offshore Indonesia." In Indonesian Petroleum Association 44th Annual Convention and Exhibition. Indonesian Petroleum Association, 2021. http://dx.doi.org/10.29118/ipa21-g-163.

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Full-waveform inversion (FWI) has evolved to be the contemporary solution to resolve velocity models in areas of complex structure. Further, wide azimuth, long offset and rich low-frequency seismic data, resulting from broadband seismic acquisition, helps FWI update deeper with better convergence and stability. In this study from the South Mahakam area in offshore Indonesia, multiple layers of carbonate exist from shallow to deep with sharp velocity contrast. The target reservoir is down to 3.5 kilometers. However, for the acquired data with narrow azimuths (NAZ), short offsets (3 kilometers)

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Gikadi, Jannis, Thomas Sattelmayer, and Antonio Peschiulli. "Effects of the Mean Flow Field on the Thermo-Acoustic Stability of Aero-Engine Combustion Chambers." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69612.

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This paper presents a finite element methodology to predict the thermoacoustic eigenmodes of combustion chambers using the linearized Navier-Stokes equations (LNSE) in frequency space. The effect of the mean flow on the acoustics is accounted for. Besides scattering and refraction of acoustic waves in shear layers, this set of equation describes two main damping mechanisms. One is related to the generation of entropy waves, so called hot-spots, in flame regions. The other is related to the transformation of acoustic energy into vorticity waves at sharp leading or trailing edges. Both fluctuati

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Krausz, Ferenc. "Femtosecond lasers and applications." In The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.tutorial.c.

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The last few years have brought about significant advances in ultrashort-pulse laser physics and its widespread applications in science and technology. The state of the art of optical pulse generation is now at the point where extremely large optical bandwidths are available. The recent appearance of novel ultrabroad-band solid-state laser materials motivated the development of new ultrafast optical modulation techniques that are capable of shaping optical pulses down to a few femtoseconds in duration. The discovery of "self-mode-locking, " and the exploitation of a "solitonlike" interplay bet

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Gjorgjeska, Irena, Vlatko Sheshov, Julijana Bojadjieva, and Kemal Edip. "THE ROLE OF SEISMIC GEOPHYSICAL METHODS IN NEAR-SURFACE CHARACTERIZATION." In 3rd Croatian Conference on Earthquake Engineering. University of Zagreb Faculty of Civil Engineering, 2025. https://doi.org/10.5592/co/3crocee.2025.123.

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Near-surface characterization, i.e., determination of the physical-mechanical characteristics of the soil and rock masses that constitute the terrain structure is crucial in avoiding catastrophic consequences during seismic and geotechnical hazards. Geophysical techniques can provide a comprehensive understanding of subsurface conditions, including the presence of weak zones, local anomalies, groundwater levels, slope stability, and tectonic structures, offering valuable information for assessing potential risks and hazards. Surface seismic methods are non-invasive and widely accepted geophysi

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Song, Zhiyao, Honggui Zhang, Jun Kong, Ruijie Li, and Wei Zhang. "An Efficient Numerical Model of Hyperbolic Mild-Slope Equation." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29146.

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Introduction of an effective wave elevation function, the simplest time-dependent hyperbolic mild-slope equation has been presented and an effective numerical model for the water wave propagation has been established combined with different boundary conditions in this paper. Through computing the effective wave elevation and transforming into the real transient wave motion, then related wave heights are computed. Because the truncation errors of the presented model only induced by the dissipation terms, but those of Lin’s model (2004) contributed by the convection terms, dissipation terms and

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Raporty organizacyjne na temat "Stability of refraction"

Simms, Janet, Benjamin Breland, and William Doll. Geophysical investigation to assess condition of grouted scour hole : Old River Control Complex—Low Sill Concordia Parish, Louisiana. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41863.

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Geophysical surveys, both land-based and water-borne, were conducted at the Old River Control Complex‒Low Sill, Concordia Parish, LA. The purpose of the surveys was to assess the condition of the grout within the scour region resulting from the 1973 flood event, including identification of potential voids within the grout. Information from the ground studies will also be used for calibration of subsequent marine geophysical data and used in stability analysis studies. The water-borne survey consisted of towed low frequency (16-80 MHz) ground penetrating radar (GPR), whereas the land-based surv

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