Relevant bibliographies by topics / Total internal reflection objective

Academic literature on the topic 'Total internal reflection objective'

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Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Total internal reflection objective"

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Burghardt, Thomas P., Andrew D. Hipp, and Katalin Ajtai. "Around-the-objective total internal reflection fluorescence microscopy." Applied Optics 48, no. 32 (November 2, 2009): 6120. http://dx.doi.org/10.1364/ao.48.006120.

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Burghardt, Thomas P., Andrew D. Hipp, and Katalin Ajtai. "Around-the-Objective Total Internal Reflection Fluorescence Microscopy." Biophysical Journal 98, no. 3 (January 2010): 177a—178a. http://dx.doi.org/10.1016/j.bpj.2009.12.949.

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Joo, C., and T. Ha. "Objective-Type Total Internal Reflection Microscopy (Excitation) for Single-Molecule FRET." Cold Spring Harbor Protocols 2012, no. 11 (November 1, 2012): pdb.prot072025. http://dx.doi.org/10.1101/pdb.prot072025.

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Joo, C., and T. Ha. "Objective-Type Total Internal Reflection Microscopy (Emission) for Single-Molecule FRET." Cold Spring Harbor Protocols 2012, no. 11 (November 1, 2012): pdb.prot072033. http://dx.doi.org/10.1101/pdb.prot072033.

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Burghardt, Thomas P. "Measuring incidence angle for through-the-objective total internal reflection fluorescence microscopy." Journal of Biomedical Optics 17, no. 12 (December 3, 2012): 126007. http://dx.doi.org/10.1117/1.jbo.17.12.126007.

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Velinov, Tzvetan, Yana Asenovska, Dessislava Marinkova, Lyubov Yotova, Stoyanka Stoitsova, Maria Bivolarska, and Lyuba Stavitskaya. "Total internal reflection imaging of microorganism adhesion using an oil immersion objective." Colloids and Surfaces B: Biointerfaces 88, no. 1 (November 2011): 407–12. http://dx.doi.org/10.1016/j.colsurfb.2011.07.022.

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Abe, Katsuyuki. "Ultra High Numerical Aperture Objective Lenses and Optical System Improved Objective Type Total Internal Reflection Fluorescence Microscopy." membrane 27, no. 5 (2002): 290–93. http://dx.doi.org/10.5360/membrane.27.290.

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Ekgasit, Sanong, and Pimthong Thongnopkun. "Novel Attenuated Total Reflection Fourier Transform Infrared Microscopy Using a Gem Quality Diamond as an Internal Reflection Element." Applied Spectroscopy 59, no. 10 (October 2005): 1236–41. http://dx.doi.org/10.1366/000370205774430972.

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A novel technique for attenuated total reflection Fourier transform infrared (ATR FT-IR) spectral acquisition by an infrared microscope with a gem-quality faceted diamond as an internal reflection element (IRE) is introduced. Unlike conventional IREs, the novel diamond IRE has a sharp tip configuration instead of a flat tip configuration. Light at normal incidence was coupled into the diamond while the transflected radiation from the diamond was collected through the table facet by the built-in 15× Cassegrainian objective. The number of reflections in the novel diamond IRE equals two. The evanescent field generated under total internal reflection at the pavilion facet was exploited for ATR spectral acquisition of materials attached to the IRE. The observed ATR spectra were compared to those obtained via a traditional zinc selenide IRE.
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Niederauer, Christian, Philipp Blumhardt, Jonas Mücksch, Michael Heymann, Armin Lambacher, and Petra Schwille. "Direct characterization of the evanescent field in objective-type total internal reflection fluorescence microscopy." Optics Express 26, no. 16 (July 27, 2018): 20492. http://dx.doi.org/10.1364/oe.26.020492.

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Lee, Ja Yil, Shul-Kee Kim, and Seok-Cheol Hong. "Characterization of the Evanescent Field in Objective-Based Total-Internal-Reflection Fluorescence (TIRF) Microscopy." Journal of the Korean Physical Society 50, no. 5 (May 15, 2007): 1340. http://dx.doi.org/10.3938/jkps.50.1340.

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Dissertations / Theses on the topic "Total internal reflection objective"

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Jia, Baohua, and n/a. "A study on the complex evanescent focal region of a high numerical aperture objective and its applications." Swinburne University of Technology, 2006. http://adt.lib.swin.edu.au./public/adt-VSWT20070205.150740.

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In recent years, optical near-field has received an ever-increasing attention owing to its ability to localise optical signals beyond the diffraction limit. Optical near-field is a non-propagating field existing in the close vicinity of a matter within a range less than the wavelength of the illumination light and it carries the high spatial frequency information showing the fine details of the matter. An optical near-field can be generated by a near-field optical microscope with a nano-aperture or a metal-coated fibre tip. However, common difficulties associated with this approach, such as a fragile probe, a low throughput and signal-to-noise ratio, and a slow response of gap controlling between the probe and the sample, make it less applicable. Alternatively, optical near-field can be produced by total internal reflection (TIR) occurring at the interface of a prism, which is capable of localising the electromagnetic (EM) field in the close vicinity of the interface. However, in this geometry, no confinement of the field can be achieved in the transverse direction, whereas, in most applications such as optical trapping, micro-fabrication and optical data storage, a transverse confinement of the light field is essential. In order to achieve a transverse confinement of the light field, maintaining the high spatial resolution of the optical near-field, and at the same time eliminating the drawbacks associated with the conventional near-field optical microscope, a novel near-field probe based on a high numerical aperture (NA) TIR objective combined with annular illumination has been developed recently. In this arrangement, an obstruction disk is inserted at the back aperture of the objective to block the light with a convergence angle lower than the critical angle determined by the refractive indices of the two media, resulting in a pure focused evanescent field in the second medium. The evanescent field produced by this method provides a useful tool for studying light-matter interaction at the single molecule level not only because of its high resolution but also due to its inherent merits such as no distance regulation, no heating effect and simple experimental setup. But, the most significant advantage that makes this method unique and superior to the other approaches in terms of producing the optical near-field is that it allows the dynamic control of the focal field by simply modulating the phase or amplitude or even the polarisation state of the incident beam before it enters the objective so that complex illumination beams can be generated, whereas in other fibre probe based approaches this goal is extremely difficult to achieve. To make use of such a novel near-field probe, a thorough theoretical and experimental investigation is required. A complete knowledge of the focused evanescent field is a prerequisite for a wide range of applications including single molecule detection, Raman spectroscopy, near-field non-linear imaging and near-field trapping. Therefore, it is not only necessary but also urgent to exploit the focusing properties of a focused evanescent field under complex field illumination both experimentally and theoretically and this is the major aim of this thesis. The complex fields, which are of particular interest in this thesis, are the radially polarised beam and the Laguerre-Gaussian (LG) beam, because the former owns a more compact circularly symmetric field distribution in the focal region when focused by a high NA objective, while the latter is capable of rotating a trapped particle by transferring the orbital angular momentum. Combining them with the focused evanescent field is potentially able to induce novel functions in the near-field region, which cannot be fulfilled by other near-field approaches. In this thesis, in order to generate these two types of beams, a single liquid crystal spatial light modulator (LCSLM) is employed to produce useful phase modulation to the incident beam. Experimental characterisation of an evanescent focal spot is performed with scanning near-field optical microscopy (SNOM), which is capable of providing the direct mapping of the focused evanescent field not only because of its high spatial resolution and its ability to detect the near-field and far-field signals simultaneously, but also due to the motion of the piezzo-stage enables a three-dimensional characterisation of the evanescent focal spot. In this thesis, a SNOM system with an aluminum coated aperture probe is implemented. The field distributions at both the interface and parallel planes with a small distance away from the interface are obtained. To verify the applicability of SNOM as a characterisation methodology, the field distribution in the focal region of a high NA objective illuminated by a linearly polarised plane wave is measured first. A focus splitting along the direction of incident polarisation is observed threedimensionally near the interface under such a circumstance. It has been demonstrated that the depolarisation effect plays an important role in determining the coupling behaviour of the light into the fibre probe of SNOM. The good match between the experimental results and theoretical predications confirms the validity of SNOM. Theoretical investigation of a tightly focused radially polarised beam is undertaken based on the vectorial-Debye diffraction theory because under the tight focusing of a high NA objective, the vectorial nature of the highly localised field has to be carefully considered in order to represent the field distribution accurately. The calculations on the focusing properties of a radially polarised beam suggest that the longitudinal field component in the focal region plays a dominant role in determining the overall field distribution. Direct measurement of the focused evanescent radially polarised beam in a three-dimensional manner near the interface is performed with SNOM. A highly localised focal spot is achieved in the close vicinity of the coverglass. The measured intensity distributions from SNOM show that correction of the focal spot deformation associated with a linearly polarised beam is achieved by taking advantage of the radially symmetric focal spot of a radially polarised beam. A smaller focal spot is acquired due to the dominant longitudinal polarisation component in the focal region, which possesses a more compact focal intensity distribution than that of the overall field. The experimental results demonstrate a good agreement with the theoretical expectations. The fact that a radially polarised beam is capable of eliminating the focus deformation often presented in the focal region of a high NA objective when a linearly polarised beam is employed can be very useful in many applications, including microfabrication using two-photon photopolymerisation technique. The theoretical study on the two-photon point spread function (PSF) of a radially polarised beam indicates that the focus elongation and splitting associated with a linearly polarised beam are eliminated and the achievable lateral size of the focal spot is approximately a quarter of the illumination wavelength, which is less than half of that under the illumination of a linearly polarised beam. A further reductiont of the lateral size can be expected by using annular radial beam illumination. The investigation on the focusing properties of LG beams has also been one of the major tasks of this thesis. Theoretical investigations of a focused evanescent LG beam suggest that the phase shift induced by the boundary effect when a light beam passes the interface satisfying TIR condition plays a vital role in determining the overall shape of the total field distribution. A severe focal intensity deformation is predicted theoretically in the case of focused evanescent LG beam illumination, which might involve new physical phenomena when applied in the near-field trapping. Such a focal intensity deformation is evidenced experimentally by the direct mapping result obtained from the SNOM probe. A quantitative cross-section comparison with the theoretical predication is conducted, which demonstrates a good agreement. To achieve a controllable optical trap and rotation in the near-field region, complex optical fields such as LG beams carrying orbital angular momentum, have been induced for the manipulation of a polystyrene particle. The influence of the focal intensity deformation on a near-field trapping has been thoroughly investigated. Rotation motion of the particle is examined by mapping the two-dimensional (2D) transverse trapping efficiency of the particle. Theoretical investigation reveals that a significant tangential force component is generated on the particle when it is illuminated by a focused evanescent LG beam. Such findings may prove useful in introducing a rotation mechanism in near-field trapping. The research investigations and methodologies described in this thesis provide a new approach to characterise the near-field focal spot under complex field illumination. It enhances the understanding of the novel near-field probe, thus opening the pathway for numerous near-field applications including optical trapping, two-photon excitation (photopolymerisation) and spectroscopy. The focal field rotation phenomena demonstrated in this thesis may prove particularly beneficial in introducing a rotation mechanism in near-field trapping using a focused evanescent field.
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Poksiński, Michał. "Total internal reflection ellipsometry /." Linköping : Univ, 2005. http://www.bibl.liu.se/liupubl/disp/disp2005/tek966s.pdf.

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Thomson, David. "Silicon based total internal reflection optical switch." Thesis, University of Surrey, 2009. http://epubs.surrey.ac.uk/844092/.

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Total internal reflection (TIR) based optical switches offer wavelength insensitivity, thermal stability, a short device length, the ability for over-driving without pre-emphasis and polarisation independence. When implemented in silicon the plasma dispersion effect is normally employed, using a PIN diode to inject carriers into the active region of the device, and allowing electrical control of the switching operation. The free diffusion of these injected carriers inhibits the formation of a large and abrupt spatial variation in free carrier concentration (and therefore refractive index) as required for an efficient switching operation. In this work the use of two types of carrier restrictive barrier have been investigated as feasible methods of improving the injected free carrier profile. The first barrier consists of an insulating silicon dioxide layer which completely isolates the PIN diode from the surrounding silicon. A 2mm thick layer has been shown to be thin enough such that the propagating light is not significantly perturbed, whilst being effective at blocking free carrier diffusion. Full device modelling has demonstrated an improved performance over the only other carrier injection based TIR switch in silicon-on-insulator (SOI) from the literature. The second barrier consists of a region of ion implantation induced defective silicon which is positioned along the opposite half of the switching region to the PIN diode. Defective silicon has a decreased free carrier lifetime and therefore any free carriers which diffuse into such material experience an enhanced recombination rate, resulting in reduced diffusion lengths. Experimentally it has been shown that the required electrical and optical properties can be produced by fully amorphising the SOI overlayer and then thermally regrowing it into polycrystalline silicon. Results obtained from fabricated devices with defective silicon barriers have shown an improvement in switching performance over those without barriers, hence successfully demonstrating the principle of barrier enhanced switching.
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Beck, Markus. "Extended resolution in total internal reflection fluorescence microscopy /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17974.

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Ouellette, Guy René. "Nonimaging light concentration using total internal reflection films." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30246.

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Here is presented a method of fabricating nonimaging light concentrators from total internal reflection film (TIRF). Prototypes have been made and tested, and found to operate in agreement with predictions of ray-tracing codes. The performance is comparable with that of concentrators made from specular reflecting materials.
Science, Faculty of
Physics and Astronomy, Department of
Graduate
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Marchington, Robert F. "Applications of microfluidic chips in optical manipulation & photoporation." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/1633.

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Integration and miniaturisation in electronics has undoubtedly revolutionised the modern world. In biotechnology, emerging lab-on-a-chip (LOC) methodologies promise all-integrated laboratory processes, to perform complete biochemical or medical synthesis and analysis encapsulated on small microchips. The integration of electrical, optical and physical sensors, and control devices, with fluid handling, is creating a new class of functional chip-based systems. Scaled down onto a chip, reagent and sample consumption is reduced, point-of-care or in-the-field usage is enabled through portability, costs are reduced, automation increases the ease of use, and favourable scaling laws can be exploited, such as improved fluid control. The capacity to manipulate single cells on-chip has applications across the life sciences, in biotechnology, pharmacology, medical diagnostics and drug discovery. This thesis explores multiple applications of optical manipulation within microfluidic chips. Used in combination with microfluidic systems, optics adds powerful functionalities to emerging LOC technologies. These include particle management such as immobilising, sorting, concentrating, and transportation of cell-sized objects, along with sensing, spectroscopic interrogation, and cell treatment. The work in this thesis brings several key applications of optical techniques for manipulating and porating cell-sized microscopic particles to within microfluidic chips. The fields of optical trapping, optical tweezers and optical sorting are reviewed in the context of lab-on-a-chip application, and the physics of the laminar fluid flow exhibited at this size scale is detailed. Microfluidic chip fabrication methods are presented, including a robust method for the introduction of optical fibres for laser beam delivery, which is demonstrated in a dual-beam optical trap chip and in optical chromatography using photonic crystal fibre. The use of a total internal reflection microscope objective lens is utilised in a novel demonstration of propelling particles within fluid flow. The size and refractive index dependency is modelled and experimentally characterised, before presenting continuous passive optical sorting of microparticles based on these intrinsic optical properties, in a microfluidic chip. Finally, a microfluidic system is utilised in the delivery of mammalian cells to a focused femtosecond laser beam for continuous, high throughput photoporation. The optical injection efficiency of inserting a fluorescent dye is determined and the cell viability is evaluated. This could form the basis for ultra-high throughput, efficient transfection of cells, with the advantages of single cell treatment and unrivalled viability using this optical technique.
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Robertson, Rebecca. "The development of electroactive total internal reflection integrated optical waveguide and total internal reflection fluorescence devices for the characterization of metalloprotein films." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/289791.

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Orientation distributions of redox active films that correlate with an electron transfer behavior were reported for the first time using electroactive total internal reflection fluorescence spectroscopy (EA-TIRF) and electroactive integrated optical waveguide (EA-IOW) absorbance technology developed here. The mean tilt angle and the angular distribution about the mean were recovered using a Gaussian model. Previous anisotropy calculations were only possible using a theoretical approach (Hansen's model). In the work presented here, a novel method was developed that was based on experimental measurements. This method used Fresnel's equations and Snell's law to determine the relative polarized electric field intensity at the interface of the EA-TIRF substrate. Optically transparent semiconductor surfaces of indium tin oxide (ITO) were used as the adlayer for EA-TIRF and EA-IOW devices. The ITO surface morphology, optical and conduction properties were characterized. The ITO was found to have adequate conduction, optical and surface morphology properties for molecular orientation distribution measurements. The results indicated the ITO morphology contributes a minimal degree of error to the calculated distribution. Surface-bound films of model methylene blue were used to characterize the EA-TIRF and EA-IOW techniques prior to the investigation of horse heart cytochrome c. The studies demonstrated potential control of redox active adsorbed films. The mean tilt angle and the angular distribution about that mean were successfully determined. In addition, the studies of the methylene blue films indicated the possibility of orientation-dependent quenching (the loss of an electron from the excited state LUMO to the ITO semiconductor conduction band). Studies of the cytochrome c films indicated anisotropic submonolayers electrostatically bound to the negative ITO surface. Cyclic voltammetry measurements showed the films to be electroactive, exhibiting quasi-reversible electrochemistry. An average tilt angle and the orientation distribution about the angle, as a function of potential, were reported for horse heart cytochrome c. This potential-dependent orientation distribution of submonolayer films is reported for the first time.
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Steele, Bridgett L. Thompson Nancy L. "Total internal reflection fluorescence microscopy for characterizing biochemical interactions." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2009. http://dc.lib.unc.edu/u?/etd,2725.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2009.
Title from electronic title page (viewed Mar. 10, 2010). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Chemistry." Discipline: Chemistry; Department/School: Chemistry.
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Chan, Ho Man. "Analysis of biomolecules by total internal reflection fluorescence microscopy." HKBU Institutional Repository, 2011. http://repository.hkbu.edu.hk/etd_ra/1254.

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Pulikkaseril, Cibby. "A multi-interface total-internal-reflection based electro-optic switch /." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80136.

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A novel method for implementing a 1 x 3 electro-optic switch in lithium tantalate is presented. Using multiple total-internal-reflection interfaces, an input beam is deflected to switch ports by reflection at a grazing angle; these interfaces are turned on by application of high voltage to a surface electrode. The expected performance of the device was simulated using a combination of in-house and commercial software, and the device was fabricated using a combination of university facilities and service vendors. Testing of the device showed that the concept of using multiple electro-optic interfaces is feasible and has potential applications in the creation of a package optical switch.
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Books on the topic "Total internal reflection objective"

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Hong, L. Frustrated total internal reflection sensors for colourimetric chemical analysis. Manchester: UMIST, 1995.

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Polnoe otrazhenie sveta v prostykh opytakh. Moskva: "Nauka," Glav. red. fiziko-matematicheskoĭ lit-ry, 1986.

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Kumuli͡a︡tivnyĭ ėffekt v prostykh opytakh. Moskva: "Nauka," Glav. red. fiziko-matematicheskoĭ lit-ry, 1989.

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Parsons, David. The use of total internal reflection fluorescence spectroscopy to study polymer and particle adsorption. Salford: University of Salford, 1991.

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Wright, A. G. The optical interface to PMTs. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199565092.003.0003.

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The optical interface between a light source and a detector is important. In most practical realizations the aim should be to collect the maximum light possible. Lens systems seldom do this efficiently, especially where the light source is diffuse. Underlying any attempt at concentrating or guiding light is subject to a fundamental limitation referred to as étendue (phase space cannot be squeezed). Light collection from small volume scintillators of high refractive index may approach 50 %, while collection from large-area scintillators is typically less than a few per cent. Incorporation of wavelength-shifting light guides and fibres leads to enhanced performance. Efficiency measurements by the author in terms of photoelectrons per keV are presented for selected configurations. Optical recycling derived from total internal reflection provides enhancement in effective quantum efficiency by a factor of up to 10. Concepts such as escape cones, adiabatic light guides, and trapped light are covered in detail.
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Book chapters on the topic "Total internal reflection objective"

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Weik, Martin H. "total internal reflection." In Computer Science and Communications Dictionary, 1799. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_19768.

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de Fornel, Frédärique. "Total Internal Reflection." In Springer Series in Optical Sciences, 5–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-540-48913-9_1.

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Weik, Martin H. "total internal reflection angle." In Computer Science and Communications Dictionary, 1799. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_19769.

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Kihm, Kenneth D. "Total Internal Reflection Microscopy (TIRM)." In Near-Field Characterization of Micro/Nano-Scaled Fluid Flows, 15–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20426-5_2.

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Juarez-Martinez, Gabriela, Alessandro Chiolerio, Paolo Allia, Martino Poggio, Christian L. Degen, Li Zhang, Bradley J. Nelson, et al. "Monolithic Total Internal Reflection Biosensor." In Encyclopedia of Nanotechnology, 1467. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100464.

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Pala, Nezih, Ahmad Nabil Abbas, Carsten Rockstuhl, Christoph Menzel, Stefan Mühlig, Falk Lederer, Joseph J. Brown, et al. "Total Internal Reflection (Fluorescence) Velocimetry." In Encyclopedia of Nanotechnology, 2755. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100863.

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Axelrod, Daniel. "Total Internal Reflection Fluorescence Microscopy." In Methods in Cellular Imaging, 362–80. New York, NY: Springer New York, 2001. http://dx.doi.org/10.1007/978-1-4614-7513-2_21.

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Ives, J. T., W. M. Reichert, J. N. Lin, V. Hlady, D. Reinecke, P. A. Suci, R. A. VanWagenen, et al. "Total Internal Reflection Fluorescence Surface Sensors." In Optical Fiber Sensors, 391–97. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3611-9_24.

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Thompson, Nancy L., Punya Navaratnarajah, and Xiang Wang. "Total Internal Reflection with Fluorescence Correlation Spectroscopy." In Reviews in Fluorescence 2009, 345–80. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9672-5_13.

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Saxena, Anuj, Vishesh Dubey, Veena Singh, Shilpa Tayal, and Dalip Singh Mehta. "Field Portable Total Internal Reflection Fluorescence Microscopy." In Springer Proceedings in Physics, 293–96. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9259-1_66.

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Conference papers on the topic "Total internal reflection objective"

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Kawano, Yoshihiro, Chikara Abe, Teruo Kaneda, Yasushi Aono, Katsuyuki Abe, Keisuke Tamura, and Susumu Terakawa. "High-numerical-aperture objective lenses and optical system improved objective type total internal reflection fluorescence microscopy." In International Symposium on Optical Science and Technology, edited by David L. Andrews, Toshimitsu Asakura, Suganda Jutamulia, Wiley P. Kirk, Max G. Lagally, Ravindra B. Lal, and James D. Trolinger. SPIE, 2000. http://dx.doi.org/10.1117/12.401623.

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Chung, Euiheon, Daekeun Kim, and Peter T. C. So. "Super-resolution Wide-field Imaging: Objective-launched Standing Wave Total Internal Reflection Fluorescence Microscopy." In Biomedical Topical Meeting. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/bio.2006.tui46.

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Ahmed, Hanaa, Sana Elashie, and Lily O'Hara. "Evaluating the Impact of a brief Health at Every Size-Based activity on body positivity and internal weight-based oppression." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0188.

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Introduction: Internal weight-based oppression WBO is the internalized negative attitudes, values and beliefs people hold about body weight, and is associated with depression, anxiety, body image disturbance, disordered eating, avoidance of physical activity, and increased calorie consumption. Conversely, body positivity encompasses body acceptance, body appreciation, and body love, and adaptive approaches protective of health and wellbeing. The objective of the study was to evaluate the impact of the brief activity on body positivity and internal WBO in female students at Qatar University. Methods: The study used a quasi-experimental pre-post evaluation design, with quantitative assessment of body positivity and internal weight-based oppression before a brief activity (pre), immediately afterwards (post), and 10 weeks later (follow up), and qualitative assessment at the 10-week follow up. Love your Body, a Health at Every Size-based activity, was developed and delivered by public health students as part of the Mental Health Festival. The 10- minute activity involved Yay scales, positive affirmation stickers, photography, postcards, and gratitude writing. Evaluation measures used were the Body Appreciation Scale 2 (BAS-2), Modified Weight Bias Internalization Scale (M-WBIS), Fat Attitudes Assessment Toolkit Size Acceptance (FAAT-SA) and Self Reflection (FAAT-SR) subscales, and an open-ended questionnaire. Results: A total of 35 female undergraduate students completed assessments at all time points. Self-reflection and body appreciation increased significantly after the activity. All measures showed a trend towards improvement from pre to post assessment, but a return to baseline or near baseline status after 10 weeks. Qualitative results suggested that improvements were sustained at follow up. Conclusion: The activity had a positive effect on participants’ body appreciation and self-reflection in the short term, but these improvements were not sustained over the longer term. The high number of missing responses compromised the potential to determine findings that are more robust.
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Walther, Benjamin, and Siva Nadarajah. "Constrained Adjoint-Based Aerodynamic Shape Optimization of a Single-Stage Transonic Compressor." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69128.

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This paper develops a discrete adjoint formulation for the constrained aerodynamic shape optimization in a multistage turbomachinery environment. The adjoint approach for viscous, internal flow problems and the corresponding adjoint boundary conditions are discussed. To allow for a concurrent rotor/stator optimization a non-reflective adjoint mixing-plane formulation is proposed. A sequential-quadratic programming algorithm is utilized to determine an improved airfoil shape based on the objective function gradient provided by the adjoint solution. The functionality of the proposed optimization method is demonstrated by the redesign of a midspan section of a single-stage transonic compressor. The objective is to maximize the isentropic efficiency while constraining the mass flow rate and the total pressure ratio.
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Ash, William M., and Myung K. Kim. "Total Internal Reflection Holographic Microscopy." In Frontiers in Optics. Washington, D.C.: OSA, 2008. http://dx.doi.org/10.1364/fio.2008.pdpb1.

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Wojdyla, A., and G. Gallot. "Total internal reflection Terahertz imaging." In 2011 36th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2011). IEEE, 2011. http://dx.doi.org/10.1109/irmmw-thz.2011.6104845.

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Herzig Sheinfux, Hanan, Bo Zhen, Ido Kaminer, and Mordechai Segev. "Total Internal Reflection in Gain Media." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/cleo_qels.2015.fm2d.3.

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Ash, William M., and Myung K. Kim. "Digital Holography of Total Internal Reflection." In Coherent Optical Technologies and Applications. Washington, D.C.: OSA, 2008. http://dx.doi.org/10.1364/cota.2008.ctua4.

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Davis, Scott T., and Chris Wyman. "Interactive refractions with total internal reflection." In Graphics Interface 2007. New York, New York, USA: ACM Press, 2007. http://dx.doi.org/10.1145/1268517.1268548.

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Yu, Hui, Wei Qi, Yubo Li, Yinlei Hao, Xiaoqing Jiang, Minghua Wang, and Jianyi Yang. "Study of total internal reflection switch." In International Conference of Optical Instrument and Technology, edited by Xuping Zhang, Wojtek J. Bock, Xiaoyi Bao, and Ping Shum. SPIE, 2008. http://dx.doi.org/10.1117/12.811137.

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Reports on the topic "Total internal reflection objective"

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Fernow, R. C. Acceleration using total internal reflection. Office of Scientific and Technical Information (OSTI), June 1991. http://dx.doi.org/10.2172/5402693.

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Yurchenko, Oleksandr, Sergiy Kolyenov, Yuriy Pilgun, Galyna Pogorielova, Oleksandr Polishko, and Eugene Smirnov. Total Internal Reflection Ultrasonic Sensor for Detection of Subsurface Flaws: Research into Underlying Physics. Fort Belvoir, VA: Defense Technical Information Center, November 2014. http://dx.doi.org/10.21236/ada620159.

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