Academic literature on the topic 'Polarisation'

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Journal articles on the topic "Polarisation"

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Gusarov, Andrei, Perry Beaumont, and Paula Siren. "Performance Enhancement of the Polarimetric Fibre Optical Current Sensor at JET Using Polarisation Optimisation." Sensors 24, no. 2 (2024): 555. http://dx.doi.org/10.3390/s24020555.

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To achieve optimal operation of the polarimetry-based FOCS, the light polarisation state at the input of the sensing fibre part must be close to a linear one. In the case of a FOCS deployed on a tokamak, the Joint European Torus (JET) in the present work, the long fibre optics link between the laser source and the sensing fibre modifies the polarisation in an unpredictable way, making it unclear which source polarisation state is to be set. A method for performing the necessary polarisation adjustment in a systematic way is proposed based on the FOCS analysis. The method requires performing da
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Bogdanov, S. A., O. S. Sidelnikov, and A. A. Redyuk. "Application of complex fully connected neural networks to compensate for nonlinearity in fibre-optic communication lines with polarisation division multiplexing." Quantum Electronics 51, no. 12 (2021): 1076–80. http://dx.doi.org/10.1070/qel17656.

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Abstract A scheme is proposed to compensate for nonlinear distortions in extended fibre-optic communication lines with polarisation division multiplexing, based on fully connected neural networks with complex-valued arithmetic. The activation function of the developed scheme makes it possible to take into account the nonlinear interaction of signals from different polarisation components. This scheme is compared with a linear one and a neural network that processes signals of different polarisations independently, and the superiority of the proposed neural network architecture is demonstrated.
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O'Brien, D. M., I. N. Polonsky, and J. B. Kumer. "Sensitivity of remotely sensed trace gas concentrations to polarisation." Atmospheric Measurement Techniques 8, no. 11 (2015): 4917–30. http://dx.doi.org/10.5194/amt-8-4917-2015.

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Abstract. Current and proposed space missions estimate column-averaged concentrations of trace gases (CO2, CH4 and CO) from high resolution spectra of reflected sunlight in absorption bands of the gases. The radiance leaving the top of the atmosphere is partially polarised by both reflection at the surface and scattering within the atmosphere. Generally, the polarisation state is unknown and could degrade the accuracy of the concentration measurements. The sensitivity to polarisation is modelled for the proposed geoCARB instrument, which will include neither polarisers nor polarisation scrambl
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O'Brien, D. M., I. N. Polonsky, and J. B. Kumer. "Sensitivity of remotely-sensed trace gas concentrations to polarisation." Atmospheric Measurement Techniques Discussions 8, no. 8 (2015): 8779–816. http://dx.doi.org/10.5194/amtd-8-8779-2015.

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Abstract. Current and proposed space missions estimate column-averaged concentrations of trace gases (CO2, CH4 and CO) from high resolution spectra of reflected sunlight in absorption bands of the gases. The radiance leaving the top of the atmosphere is partially polarised by both reflection at the surface and scattering within the atmosphere. Generally the polarisation state is unknown, and could degrade the accuracy of the concentration measurements. The sensitivity to polarisation is modelled for the proposed geoCARB instrument, which will include neither polarisers nor polarisation scrambl
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Piltyay, Stepan, Andrew Bulashenko, Hanna Kushnir, and Oleksandr Bulashenko. "Information Resources Economy in Satellite Systems based on New Microwave Polarizers with Tunable Posts." Path of Science 6, no. 11 (2020): 5001–10. http://dx.doi.org/10.22178/pos.64-6.

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One of the fundamental problems of modern digital telecommunications is the economy of digital information and frequency resources, which are highly limited. The introduction of novel telecommunication systems and 5G networks requires searching for principal solutions for the economy and reusing the frequency spectrum. Therefore, modern wireless mobile, terrestrial, and satellite systems use various new technologies to increase communication channels' information capacity for the economy of limited frequency resources. One of the most effective ways to reuse the information system's operating
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Prabhu, A., A. Brandenburg, M. J. Käpylä, and A. Lagg. "Helicity proxies from linear polarisation of solar active regions." Astronomy & Astrophysics 641 (September 2020): A46. http://dx.doi.org/10.1051/0004-6361/202037614.

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Context. The α effect is believed to play a key role in the generation of the solar magnetic field. A fundamental test for its significance in the solar dynamo is to look for magnetic helicity of opposite signs both between the two hemispheres as well as between small and large scales. However, measuring magnetic helicity is compromised by the inability to fully infer the magnetic field vector from observations of solar spectra, caused by what is known as the π ambiguity of spectropolarimetric observations. Aims. We decompose linear polarisation into parity-even and parity-odd E and B polarisa
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Eriksson, P., B. Rydberg, and S. A. Buehler. "On cloud ice induced absorption and polarisation effects in microwave limb sounding." Atmospheric Measurement Techniques 4, no. 6 (2011): 1305–18. http://dx.doi.org/10.5194/amt-4-1305-2011.

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Abstract. Microwave limb sounding in the presence of ice clouds was studied by detailed simulations, where clouds and other atmospheric variables varied in three dimensions and the full polarisation state was considered. Scattering particles were assumed to be horizontally aligned oblate spheroids with a size distribution parameterized in terms of temperature and ice water content. A general finding was that particle absorption is significant for limb sounding, which is in contrast to the down-looking case, where it is usually insignificant. Another general finding was that single scattering c
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Ferré, Vincent. "Macronisme, polarisation sociale et polarisation politique." Commentaire Numéro169, no. 1 (2020): 215. http://dx.doi.org/10.3917/comm.169.0215.

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Hodgkinson, T. G., R. A. Harmon, and D. W. Smith. "Polarisation-insensitive heterodyne detection using polarisation scrambling." Electronics Letters 23, no. 10 (1987): 513–14. http://dx.doi.org/10.1049/el:19870371.

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Heismann, F., P. B. Hansen, S. K. Korotky, G. Raybon, J. J. Veselka, and M. S. Whalen. "Automatic polarisation demultiplexer polarisation-multiplexed transmission systems." Electronics Letters 29, no. 22 (1993): 1965. http://dx.doi.org/10.1049/el:19931308.

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Dissertations / Theses on the topic "Polarisation"

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García, Reyes María Elena. "Income polarisation." Thesis, University of York, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420261.

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Bregenzer, Josef Johann. "Integrated polarisation rotators." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/1573/.

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The ability to control and manipulate the state of polarisation of optical signals is becoming an increasingly desirable feature in numerous applications including integrated optical circuits, semiconductor optical amplifiers (SOAs) and optical communication systems. This thesis introduces the design, optimisation, fabrication and operation of two novel integrated reciprocal single-section passive polarisation converter devices based upon mode-beating. The converter designs consist of asymmetric profiled waveguides, which were realised in a single reactive ion dry-etch process step. An in-situ
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Pérez, Linde Angel Joaquin. "Application of cross polarisation techniques to dynamic nuclear polarisation dissolution experiments." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11417/.

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Dynamic Nuclear Polarisation (DNP) was suggested for the first time by Albert Overhauser in early 1950s. In DNP experiments the polarisation from electrons can be transferred to nuclei by irradiation of the electron resonance line. There are several possible mechanisms for polarisation transfer that involve DNP in solid state depending on the width of the electron line in respect to the nuclear Larmor frequency. In this thesis, the efficiency of TEMPO radical (2,2,6,6 tetramethilpiperidine, 1 oxyl) for DNP is demonstrated in combination with nuclear polarisation transfer techniques for dissolu
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Böcker, Matthias. "Messung der transversalen L-Polarisation [Lambda-Polarisation] mit dem HERA-B-Detektor." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971196591.

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Gul-E-Saman. "Surface analysis using polarisation." Thesis, University of York, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.583351.

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Unpolarised light incident on a surface acquires partial polarisation due to the orientation of the dipoles in the scatterer. This thesis focuses on the use of polarised light for diffuse reflectance for surface analysis. Since, the state of polarisation is acquired on interaction with the surface, the polarised light contains information about the surface properties (of the scatterer). A great amount of research has been carried out in computer vision for surface analysis using image analysis techniques. Recently, the trend has been to combine optical techniques with computer vision in order
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Thompson, P. G. "Polarisation-tunable plasmonic devices." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1396243/.

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This research project aims to investigate the phenomenon of extraordinary optical transmission (EOT) in arrays of asymmetric cruciform apertures. The specific area of EOT examined is the dependence of transmission on incident polarisation. The approach to investigating this phenomenon can be divided into three main sections: fabrication, characterisation and simulations. The method of fabrication involved two main processes: fabrication of Au thin films on CaF2 substrates using thermal evaporation, and the milling of cruciform apertures in the thin films using focused in beam (FIB). A 5 nm adh
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Watley, Daniel Andrew. "Polarisation mode dispersion compensation." Thesis, University of Cambridge, 2000. https://www.repository.cam.ac.uk/handle/1810/272331.

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Siddiqui, Z. S. "Fast polarisation sampling system for characterisation of polarisation noise in fibre transmission systems." Thesis, University of Essex, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303462.

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Prunet, Simon. "Polarisation du ciel micro-ondes." Phd thesis, Université Paris Sud - Paris XI, 1998. http://tel.archives-ouvertes.fr/tel-00008317.

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La mission ESA Planck offre une opportunité sans précédent de mesurer de manière très précise la polarisation de l'émission Galactique et extragalactique dans le domaine millimétrique et sub-milli\-métrique ; elle devrait notamment permettre de mesurer la polarisation du Fond Cosmique Micro-ondes (FCM). Dans le premier chapitre, nous expliquons brièvement l'intérêt scientifique d'une telle mesure, et revoyons les technologies instrumentales qui la permettent. Dans le second chapitre, nous modélisons les caractéristiques statistiques de l'émission galactique polarisée, en particulier celle des
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Campbell, Ewen K. "Atomic polarisation in molecular photodissociation." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:d1fd3e32-62be-4154-880f-431ec6045baa.

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1) species show a preference for the MJ = ±1 sub-levels. For these bands the electronic alignment is very similar to that observed in the dissociation of OCS, indicating a similar mechanism, at least in the exit channel, is responsible for the polarisation in both systems.
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Books on the topic "Polarisation"

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Board, Securities and Investments. Polarisation. Securities and Investments Board, 1991.

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Berglund, Tomas, and Ylva Ulfsdotter Eriksson. Scrutinising Polarisation. Routledge, 2024. http://dx.doi.org/10.4324/9781003412861.

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Huard, Serge. Polarisation of light. John Wiley, 1997.

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Willmott, Peter. Polarisation and social housing. Policy Studies Institute, 1988.

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Linda, Hantrais, Mangen Stephen P, and Cross-National Research Group, eds. Polarisation and urban space. Cross-National Research Group, 1994.

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P, Mangen Stephen, Hantrais Linda, and Cross-National Research Group, eds. Polarisation and urban space. Cross-National Research Group, 1993.

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Authority, Financial Services. Reforming Polarisation: First Steps. Financial Services Authority, 2001.

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Torcal, Mariano. Affective Polarisation in Spain. Routledge, 2023. http://dx.doi.org/10.4324/9781003398332.

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McIntyre-Mills, Janet J., and Yvonne Corcoran-Nantes, eds. From Polarisation to Multispecies Relationships. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6884-2.

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Cloude, Shane. Polarisation: Applications in remote sensing. Oxford University Press, 2009.

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Book chapters on the topic "Polarisation"

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Wiesel, Ilan. "Polarisation." In Power, Glamour and Angst. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1367-7_1.

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Beynon, J. "Polarisation." In Work Out Waves and Optics. Macmillan Education UK, 1988. http://dx.doi.org/10.1007/978-1-349-10165-8_5.

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Eichler, Jürgen, and Hans Joachim Eichler. "Polarisation." In Laser. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-41438-1_15.

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Eichler, Jürgen, and Hans-Joachim Eichler. "Polarisation." In Laser in Technik und Forschung. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-42591-6_15.

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Douglas, Roy. "Polarisation." In World Crisis and British Decline, 1929–56. Palgrave Macmillan UK, 1986. http://dx.doi.org/10.1007/978-1-349-18194-0_5.

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Eichler, Jürgen, and Hans Joachim Eichler. "Polarisation." In Laser. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-08243-0_15.

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Eichler, Jürgen, and Hans Joachim Eichler. "Polarisation." In Laser. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-08245-4_15.

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Eichler, Jürgen, and Hans Joachim Eichler. "Polarisation." In Laser in Technik und Forschung. Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-08247-8_15.

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Eichler, Jürgen, and Hans-Joachim Eichler. "Polarisation." In Laser in Technik und Forschung. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-662-22080-1_15.

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Crawford, Frank S. "Polarisation." In Schwingungen und Wellen. Vieweg+Teubner Verlag, 1989. http://dx.doi.org/10.1007/978-3-322-90777-6_8.

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Conference papers on the topic "Polarisation"

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Chauchot, P., B. Bigourdan, and L. Lemoine. "Cathodic Protection Systems Modelled by the Procor Software." In CORROSION 1989. NACE International, 1989. https://doi.org/10.5006/c1989-89401.

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Abstract After an introduction to different softwares developped for the study of cathodically protected systems, the capabilities of the PROCOR software, supported by the french offshore industry, are presented. This software is based on a three- dimensionnal direct boundary element method. Three different applications, the study of the polarisation parameters in a laboratory experiment, the design of the protection of a complex node of a jacket, the verification of the protection of a group of pipe-lines, are used to emphasize the great influence of polarisation conditions on the accuracy of
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Hutchings, D. C., J. S. Aitchison, B. S. Wherrett, G. T. Kennedy, and W. Sibbett. "Polarisation dependence of ultrafast nonlinear refraction in semiconductor waveguides." In Nonlinear Guided Waves and Their Applications. Optica Publishing Group, 1995. http://dx.doi.org/10.1364/nlgw.1995.nsab10.

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There is considerable interest in the optical Kerr effect, described by the nonlinear refractive index n2, as it can be employed to perform high-speed, all-optical switching. Semiconductor waveguides offer an attractive media for compact, integrated all-optical switching.1,2 The dispersion of n2 in direct-gap, zinc- blende semiconductors was recently accurately calculated using a four-band Kane model.3 In this paper the polarisation dependence of nonlinear refraction in zinc-blende semiconductors will be addressed. This dependence has two aspects to it: (1) an optical polarisation dependence w
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Varming, P., J. L. Philipsen, M. O. Berendt, et al. "Polarisation control mechanism of DFB fibre lasers." In The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.ctuf7.

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Since the introduction of single-mode DFB fibre lasers with UV induced phase-shift, these lasers have found many applications within optical communication [1]. Single polarisation operation of the laser could be attributed to a polarisation dependence of either the grating reflectivity, background loss, erbium gain, or the phase-shift. It has been shown that a birefringent distributed phase-shift causes a considerable difference in the magnitude of the phase-shift experienced by the two polarisations [2]. However, until now it has not been clarified which polarisation dependent effect is domin
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Yamashita, Shinji, and Gregory J. Cowie. "Single-polarisation operation of injection locked fibre DFB lasers." In The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.ctuf6.

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Optical fibre distributed-feedback (DFB) lasers using UV-written fibre Bragg gratings on Er3+:Yb3+ fibres feature single-frequency operation, thus are a promising technology for applications in optical fibre communications[1]. Most fibre DFB lasers, however, actually operate in two orthogonal polarisations as a result of polarisation independence in the fibre DFB resonator, which is not desirable for these applications. In this paper, we report single-polarisation operations of fibre DFB lasers using injection locking techniques, which are similar to those used for polarisation switching in He
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Snelling, M. J., P. Perozzo, R. Bambha, A. Miller, and D. C. Hutchings. "Time Resolved Optical Orientation Used to Examine Coulomb Screening and Phase Space Filling in Quantum Well Excitonic Saturation." In Quantum Optoelectronics. Optica Publishing Group, 1993. http://dx.doi.org/10.1364/qo.1993.qthc.2.

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Picosecond pulses from a mode locked dye laser were used in an excite-probe configuration (figure 1) with excite and probe beam powers of 200uW and 20uW respectively. Both beams were polarised to produce either mutually orthogonal linear polarisations (linear-linear), the same circular polarisation (same-circular), or opposite circular polarisation (opposite-circular). The sample was fabricated by MBE with a p-type background doping of 1016cm-3, etched to remove the GaAs substrate, and consisted of 120 periods of 65Å quantum wells with 212Å AI0.4Ga0.6As barriers.
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HODGKINSON, T. G., R. A. HARMON, and D. W. SMITH. "POLARISATION INSENSITIVE HETERODYNE DETECTION USING POLARISATION SCRAMBLING." In Optical Fiber Communication Conference. OSA, 1987. http://dx.doi.org/10.1364/ofc.1987.pdp15.

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Goddard, J. W. F. "Polarisation observations of an intense squall line." In IEE Colloquium on Polarisation in Radar. IEE, 1996. http://dx.doi.org/10.1049/ic:19960439.

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Watts, S. "Optimum radar polarisation for target detection in sea clutter." In IEE Colloquium on Polarisation in Radar. IEE, 1996. http://dx.doi.org/10.1049/ic:19960435.

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Blacknell, D. "Single point and spatial statistics of polarimetric SAR imagery." In IEE Colloquium on Polarisation in Radar. IEE, 1996. http://dx.doi.org/10.1049/ic:19960432.

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Britton, A. "Polarimetric scattering properties of natural targets at 80 GHz." In IEE Colloquium on Polarisation in Radar. IEE, 1996. http://dx.doi.org/10.1049/ic:19960433.

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Reports on the topic "Polarisation"

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Miller, Jack, and Rowena Bermingham. Political polarisation and participation. Parliamentary Office of Science and Technology, 2021. http://dx.doi.org/10.58248/hs21.

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Hamilton, David Jonathan. Polarisation Transfer in Proton Compton Scattering at High Momentum Transfer. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/917711.

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Rowson, Peter C. Positron Polarisation and Low Energy Running at a Linear Collider. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/798967.

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Jelka Stojanov, Jelka Stojanov. Actual and perceived polarisation in people’s opinions on behavioural policy interventions. Experiment, 2022. http://dx.doi.org/10.18258/27553.

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Toner, W. T. Resonance method to produce a polarisation asymmetry in electron-positron storage rings. Office of Scientific and Technical Information (OSTI), 1988. http://dx.doi.org/10.2172/7126893.

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Liedhegener, Antonius, Gert Pickel, Anastas Odermatt, Alexander Yendell, and Yvonne Jaeckel. Polarisation and social cohesion: the ambivalent potential of religion in democratic societies. Leipzig University, 2021. http://dx.doi.org/10.36730/rtv.2020.

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van Ginkel, Bibi, and Peter Knoope. How to respond to Quran desecrations? What we can learn from earlier incidents. ICCT, 2023. http://dx.doi.org/10.19165/2023.2.06.

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In 2008, the Dutch government prepared a strategic communications campaign to prevent and to manage a potential fall out in terms of polarisation in society and rising security risks as a result of the broadcasting of the Islam-critical movie ‘Fitna’, produced by a Dutch politician. The Dutch government learned lessons from the response by the Danish government to the Mohammed cartoon riots in 2005 to inform its own strategic communication campaign. The authors of this Policy Brief reflect on the lessons of this successful campaign to offer recommendations to governments on how to respond to t
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Zhang, Lin. High Extinction Ratio In-Fibre Polarisers by Exploiting Tilted Fibre Bragg Grating Structures for Single-Polarisation High-Power Fibre Lasers and Amplifiers. Defense Technical Information Center, 2009. http://dx.doi.org/10.21236/ada524631.

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Secretariat, Commonwealth. Preventing and Countering Violent Extremism. Commonwealth Secretariat, 2022. https://doi.org/10.14217/comsec.971.

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The capacity-building workshop on Preventing/Countering Violent Extremism, on which this Practitioners’ Guide is based, came at the right time for the Governing Board, Regional Peace Councils, Regional Executive Secretaries and Management of the Head Office of the National Peace Council, considering the threats posed by terrorism and violent extremism in West Africa and the Sahel and in other neighbouring countries. Even though Ghana has consistently been celebrated as a stable democracy, growing fears of the spread of extremist groups across the sub-region — given the porous borders — have he
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Nampoothiri, Niranjan, and Patta Scott-Villiers. Global Practices of Building Civic Culture. Institute of Development Studies, 2024. https://doi.org/10.19088/ids.2024.048.

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Strong civic culture makes for inclusive, participatory, and adaptive democracies. Citizen University is a non-profit that engages with civic catalysts to build civic culture across the United States. It supports civic catalysts to work on five tried-and-tested strategies: deepening civic commitment, building civic skills and infrastructure, providing encouragement, reckoning and repairing, and strengthening community. This report explores the relevance of each of these strategies in a global context. The learning we present is based on appreciative inquiry with seven inspiring civic catalysts
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