GAEM - Group of Applied Electromagnetics

Publications

16 papers on international journals

42 papers at international conferences

0 papers on national journals

23 papers at national conferences

Enrico Coscelli's Publications

International Journal Papers

F. Poli, E. Coscelli, A. Cucinotta, S. Selleri, "Inner cladding influence on mode interaction in symmetry-free photonic crystal fibers under heat load," Optical and Quantum Electronics 49(10), 323 (2017)[https://doi.org/10.1007/s11082-017-1157-6].
Kundong Mo, Bo Zhai, Li Jianfeng, E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, Chen Wei, Yong Liu , "Numerical investigation on broadband mid-infrared supercontinuum generation in chalcogenide suspended-core fibers," Chinese Physics B 26(5), 054216 (2017)[http://stacks.iop.org/1674-1056/26/i=5/a=054216].
E. Coscelli, R. Dauliat, F. Poli, D. Darwich, A. Cucinotta, S. Selleri, K. Schuster, A. Benoit, R. Jamier, P. Roy, F. Salin, "Analysis of the modal content into large-mode-area photonic crystal fibers under heat load," J. of Selected Topics in Quantum Electronics 22(2) (2016)[http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7270275].
L. Rosa, E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, "Full-vector modeling of thermally-driven gain competition in Yb-doped reduced symmetry photonic-crystal fiber ," Optical and Quantum Electronics 48, 1-8 (2016).
L. Rosa, E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, "Thermal modeling of gain competition in Yb-doped large-mode-area photonic-crystal fiber amplifier," Optics Express 23(14), 18638-18644 (2015)[https://www.osapublishing.org/oe/abstract.cfm?uri=oe-23-14-18638].
E. Coscelli, F. Poli, J. Li, A. Cucinotta, S. Selleri, "Dispersion engineering of highly nonlinear chalcogenide suspended core fibers," IEEE Photonics Journal 7(3), 2200408 (2015)[http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7083701].
F. Poli, E. Coscelli, A. Cucinotta, S. Selleri, F. Salin, "Single-mode propagation in Yb-doped large mode area fibers with reduced cladding symmetry," IEEE Photonics Technology Letters 26(21), 2454-2457 (2014)[http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6901208].
E. Coscelli, C. Molardi, A. Cucinotta, S. Selleri, "Symmetry-free Tm-doped photonic crystal fiber with enhanced mode area," IEEE Journal of Selected Topics in Quantum Electronics 20(5), 1-7 (2014)[http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6709780].
E. Coscelli, A. Cucinotta, "Modeling thermo-optic effect in large mode area double cladding photonic crystal fibers," International Journal of Modern Physics B 28(12), 1442002 (2014)[http://www.worldscientific.com/doi/abs/10.1142/S0217979214420028].
E. Coscelli, C. Molardi, M. Masruri, A. Cucinotta, S. Selleri, "Thermally resilient Tm-doped large mode area photonic crystal fiber with symmetry-free cladding," Optics Express 22(8), 9707-9714 (2014)[http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-8-9707].
E. Coscelli, F. Poli, T. T, Alkeskjold, M. Jørgensen, L. Leick, J. Broeng, A. Cucinotta, S. Selleri, "Thermal Effects on the Single-mode Regime of Distributed Modal Filtering Rod Fiber," IEEE J. Lightwave Technology 30(22), 3494-3499 (2012)[http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6320603].
E. Coscelli, F. Poli, T. T. Alkeskjold, F. Salin, L. Leick, J. Broeng A. Cucinotta, S. Selleri, "Single-mode design guidelines for 19-cell double-cladding photonic crystal fibers," IEEE J. Lightwave Technology 30(12), 2012 (2012).
S. Petersen, T. Alkeskjold, F. Poli, E. Coscelli, M. Jørgensen, M. Laurila, J. Lægsgaard, J. Broeng, "Hybrid Ytterbium-doped large-mode-area photonic crystal fiber amplifier for long wavelengths," Optics Express 20(6), 6010-6020 (2012).
F. Poli, E. Coscelli, T. T. Alkeskjold, D. Passaro, A. Cucinotta, L. Leick, J. Broeng, S. Selleri, "Cut-off analysis of 19-cell Yb-doped double-cladding rod-type photonic crystal fibers," Opt. Express 19(10), 9896-9907 (2011).
E. Coscelli, F. Poli, T. T. Alkeskjold, D. Passaro, A. Cucinotta, L. Leick, J. Broeng, S. Selleri, "Single-mode analysis of Yb-doped double-cladding distributed spectral filtering photonic crystal fibers," Opt. Express 18(26), 27197–27204 (2010).
E. Coscelli, M. Sozzi, F. Poli, D. Passaro, A. Cucinotta, S. Selleri, R. Corradini, R. Marchelli, "Towards Highly Specific DNA Biosensor: PNA-Modified Suspended Core Photonic Crystal Fiber," IEEE Journal of Selected Topics in Quantum Electronics 16(4), 967-972 (2010).

International Conference Papers

F. Poli, E. Coscelli, L. Rosa, A. Cucinotta, S. Selleri, "Thermal effects and gain competition in Yb-doped large mode area fibers for high-power applications," ICTON 2016, July 10-14, 2016, Trento, Italy.
E. Coscelli, F. Poli, L. Rosa, A. Cucinotta, S. Selleri, "Modelling of thermal effects and gain competition in Yb-doped large-mode-area photonic crystal fibers (invited paper)," SPIE Photonics Europe 2016, Brussels, Belgium, 9886-23.
E. Coscelli, F. Poli, R. Dauliat, D. Darwich, A. Cucinotta, S., K. Schuster, A. Benoit, R. Jamier, P. Roy, F. Salin, "Inner cladding influence on large mode area photonic crystal fiber properties under severe heat load," SPIE Photonics West 2016, February 13-18, 2106, San Francisco CA, USA, 9728-80.
E. Coscelli, F. Poli, J. Li, A. Cucinotta, S. Selleri, "Highly nonlinear chalcogenide suspended-core fibers for applications in the mid-infrared (invited paper)," SPIE Europe Optics and Optoelectronics 2015, April 13-16, 2015, Prague, Czech Republic.
R. Dauliat, E. Coscelli, F. Poli, A. Benoît, D. Darwich, R. Jamier, K. Schuster, S. Grimm, A. Cucinotta, S. Selleri, F. Salin, P. Roy, "Large mode area aperiodic fiber designs for robust singlemode emission under high thermal load," SPIE Europe Optics and Optoelectronics 2015, April 13-16, 2015, Prague, Czech Republic.
E. Coscelli, F. Poli, L. Rosa, A. Cucinotta, S. Selleri, "Modeling of single-mode regime in active large mode area photonic crystal fibers under severe heat load," Optical Wave & waveguide Theory and Numerical Modelling, April 17-18, 2015, London, UK.
L. Rosa, E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, "Full-vector modeling of thermally-driven gain competition in Yb-doped large-mode-area photonic-crystal fiber," Optical Wave & waveguide Theory and Numerical Modelling, April 17-18, 2015, London, UK.
F. Poli, E. Coscelli, A. Cucinotta, S. Selleri, F. Salin, "Yb-doped large mode area fibers with reduced cladding symmetry," SPIE Photonics West 2015, February 7-12, 2015, San Francisco CA, USA, 9344-3.
E. Coscelli, F. Poli, J. Li, A. Cucinotta, S. Selleri, "Chalcogenide suspended-core fibers for supercontinuum generation in the mid-infrared," SPIE Photonics West 2015, February 7-12, 2015, San Francisco CA, USA, 9347-59.
A. Candiani, E. Coscelli, F. Poli, C. Molardi, A. Cucinotta, S. Selleri,, "Symmetry-free large-mode area rod-type photonic crystal fibers," General Assembly and Scientific Symposium (URSI GASS), 2014 XXXIth URSI, August 16-23, 2014, Beijing, China, 1-2.
A. Cucinotta, E. Coscelli, F. Poli, S. Selleri, "Thermo-optical effects in large mode area photonic crystal fibers," ICTON 2014, July 6-10, 2014, Graz, Austria, We.A6.1.
E. Coscelli, C. Molardi, F. Poli, A. Cucinotta, S. Selleri, "Tm-doped Rod-type Photonic Crystal Fibers with Symmetry-Free Cladding," CLEO:2014, June 8-13, 2014, San Jose CA, USA, JTh2A.22.
E. Coscelli, C. Molardi, F. Poli, A. Cucinotta, S. Selleri, "Double-cladding photonic crystal fibers with reduced cladding symmetry for Tm-doped lasers," SPIE Photonics Europe, April 14-17, 2014, Brussels, Belgium, 9128-8.
E. Coscelli, T. T. Alkeskjold, A. Cucinotta, S. Selleri, "Design of double-cladding large mode area all-solid photonic bandgap fibers," SPIE Photonics West 2014, 1-6 February, 2014, San Francisco CA, USA, 8961-14.
C. Molardi, E. Coscelli, A. Cucinotta, S. Selleri, "Thermo-optical effects in Tm-doped large mode area photonic crystal fibers," SPIE Photonics West 2014, 1-6 February, 2014, San Francisco CA, USA, 8961-97.
A. Candiani, Hussein T. Salloom, E. Coscelli, M. Sozzi, A. Manicardi, Ahmad K. Ahmad, A. Hadi Al-Janabi, R. Corradini, G. Picchi, A. Cucinotta, S. Selleri, "Bio-functionalized hollow core photonic crystal fibers for label-free DNA detection," SPIE Photonic West, February 1-6, 2014, San Francisco, CA, USA, 8938-26.
M. Masruri, L. Vincetti, C. Molardi, E. Coscelli, A. Cucinotta, S. Selleri, "Confinement loss scaling law analysis in tube lattice fibers for terahertz applications," SPIE Photonics West 2014, 1-6 February, 2014, San Francisco CA, USA, 8985-14.
E. Coscelli, F. Poli, T. Alkeskjold, M. Jørgensen, A. Cucinotta, S. Selleri, "Enhanced thermal-effect resilience in distributed modal filtering large mode area photonic crystal fibers," CLEO Europe - IQEC 2013, May 12-16, 2013, Munich, Germany, CJ-P.2 (568).
E. Coscelli, F. Poli, R. Mwad Naife, A. Cucinotta, H. Al-Janabi, S. Selleri, "Comparison of thermally-induced single-mode regime changes in Yb-doped large mode area photonic crystal fibers," SPIE Europe Optics and Optoelectronics 2013, April 15-18, 2013, Prague, Czech Republic, 8775-23.
M. Sozzi, F. Manilia, R. Antezza, C. Catellani, A. Candiani, E. Coscelli, A. Cucinotta, S. Selleri, D. Menossi, A. Bosio, "Laser scribing integration of polycrystalline thin film solar cells," SPIE Photonics West 2013, February 2-7, 2013, San Francisco CA, USA, 8608-29.
E. Coscelli, F. Poli, M. M. Jørgensen, T. T. Alkeskjold, L. Leick, J. Broeng, M.Sozzi, A. Candiani, A. Cucinotta, S. Selleri, "Thermal effect-resilient design of large mode area double-cladding Yb-doped photonic crystal fibers," SPIE Photonics West 2013, February 2-7, 2013, San Francisco CA, USA, 8601-96.
A. Candiani, S. Giannetti, M. Sozzi, E. Coscelli, F. Poli, A. Cucinotta, A. Bertucci, R. Corradini, M. Konstantaki, W. Margulis, S. Pissadakis, S. Selleri, "Microstructured optical fiber Bragg grating sensor for DNA detection," SPIE Photonics West 2013, February 2-7, 2013, San Francisco CA, USA, 8576-13.
E. Coscelli, F. Poli, M. M. Jørgensen, M. Laurila, J. Lægsgaard, T. T. Alkeskjold, L. Leick, J. Broeng, A. Cucinotta, S. Selleri, "Thermal-induced refractive index change effects on distributed modal filtering properties of rod-type photonic crystal fibers," IEEE Photonics Conference 2012, September 27-27, 2012, San Francisco CA, USA, ThN5.
E. Coscelli, F.Poli, M. M. Jørgensen, M. Laurila, J. Lægsgaard, T. T. Alkeskjold, L. Leick, J. Broeng, A. Cucinotta, S. Selleri, "Thermally-induced changes in distributed modal filtering Yb-doped double-cladding photonic crystal fibers," 5th EPS-QEOD Europhoton Conference, August 25-31, 2012, Stockholm, Sweden, ThP.26.
E. Coscelli, F.Poli, M. M. Jørgensen, M. Laurila, J. Lægsgaard, T. T. Alkeskjold, L. Leick, J. Broeng, A. Cucinotta, S. Selleri, "Thermal effects in Yb-doped double cladding distributed modal filtering rod-type fibers," ICTON 2012, July 2-5, 2012, Coventry, UK, We.B6.5.
S. Petersen, M M. Jørgensen, E. Coscelli, F. Poli, S. Selleri, M. Laurila, T. T. Alkeskjold, J. Lægsgaard, "Ytterbium-doped large-mode-area photonic crystal fiber amplifier with gain shaping for use at long wavelengths," SPIE Photonics West 2012, January 21-26, 2012, San Francisco CA, USA, 8237-132.
F. Poli, E. Coscelli, T. T. Alkeskjold, A. Cucinotta, S. Selleri, L. Leick, J. Broeng, "Avoided-crossing based modal cut-off analysis of 19-cell double-cladding photonic crystal fibers," SPIE Photonics West 2012, January 21-26, 2012, San Francisco CA, USA, 8237-110.
E. Coscelli, F.Poli, S. Petersen, T. T. Alkeskjold, A. Cucinotta, S. Selleri, L. Leick, J. Broeng, "Anti-symmetric hybrid photonic crystal fibers with enhanced filtering and bending properties," SPIE Photonics West 2012, January 21-26, 2012, San Francisco CA, USA, 8237-129.
E. Coscelli, F. Poli, S. Petersen, T. T. Alkeskjold, A. Cucinotta, S. Selleri, L. Leick, J. Broeng, "Bending properties of anti-symmetric hybrid photonic crystal fibers," IQEC/CLEO Pacific Rim 2011, August 28 - September 2, 2011, Sidney, Australia.
A. Candiani, P. Childs, S. Pissadakis, M. Sozzi, E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, R. Veneziano, R. Corradini, R. Marchelli, "Double tilted fiber Bragg gratings for label-free DNA detection," 2011 International Workshop on Biophotonics, June 8-10, 2011, Parma, Italy, We2.4.
M. Sozzi, E. Coscelli, F. Poli, A. Cucinotta, R. Corradini, R. Marchelli, M. Konstantaki, S. Pissadakis, S. Selleri, "Long period grating-based fiber optic sensor for label-free DNA detection," 2011 International Workshop on Biophotonics, June 8-10, 2011, Parma, Italy, We2.2.
E. Coscelli, F. Poli, D. Passaro, A. Cucinotta, S. Selleri, T. T. Alkeskjold, L. Leick, J. Broeng, "Single-Mode Regime of Large Mode Area Double Cladding Photonic Crystal Fibers," CLEO Europe 2011, May 22-26, 2011, Munich, Germany, CJ.P.20.
E. Coscelli, F. Poli, T. T. Alkeskjold, D. Passaro, A. Cucinotta, S. Selleri, L. Leick, J. Broeng, "Single-mode regime of 19-cell Yb-doped double-cladding photonic crystal fibers," SPIE Photonics West 2011, January 22-27, 2011, San Francisco CA, USA, 7914-67.
F. Poli, E. Coscelli, T. T. Alkeskjold, D. Passaro, A. Cucinotta, S. Selleri, L. Leick, J. Broeng, "Hybrid large mode area photonic crystal fiber for distributed spectral filtering and single-mode operation," SPIE Photonics West 2011, January 22-27, 2011, San Francisco CA, USA, 7914-61.
F. Poli, E. Coscelli, D. Passaro, A. Cucinotta, T. T. Alkeskjold, L. Leick, J. Broeng, S. Selleri, "Effective area of a bent polarizing double-clad Yb-doped photonic crystal fiber," IEEE Photonics Society Winter Topical Meetings 2011, January 10-12, 2011, Keystone CO, USA, MD3.3.
E. Coscelli, F. Poli, D. Passaro, A. Cucinotta, S. Selleri, C. B. Olausson, L. Leick, J. Broeng, "Bending-induced single-mode behaviour of a polarizing double-clad Yb-doped photonic crystal fiber," European Conference on Optical Communication - ECOC2010, September 19-23, 2010, Turin, Italy.
E. Coscelli, F. Poli, D. Passaro, A. Cucinotta, S. Selleri, R. Corradini, R. Marchelli, "DNA-recognition by pepetide nucleic acid-modified PCFs: from models to real samples," Photonics Europe 2010, April 12-16,2010, Brussels, Belgium.
E. Coscelli, F. Poli, D. Passaro, A. Cucinotta, S. Selleri, "Guiding properties of kagome-lattice hollow-core fibers," Photonics Europe 2010, April 12-16,2010, Brussels, Belgium.
F. Poli, E. Coscelli, D. Passaro, A. Cucinotta, S. Selleri, J. Lægsgaard, J. Broeng, "Higher-order mode suppression in rod-type photonic crystal fibers with sectioned doping and enlarged core," Photonics Europe 2010, April 12-16,2010, Brussels, Belgium.
E. Coscelli, M. Sozzi, F. Poli, D. Passaro, A. Cucinotta, S. Selleri, R. Corradini, R. Marchelli, "Towards biosensing with suspended core photonic crystal fiber," 3rd EOS Topical Meeting on Optical Microsystems, 27-30 September 2009, Capri, Italy, 2270.
S. Selleri, E. Coscelli, F. Poli, D. Passaro, A. Cucinotta, "Sensing through suspended solid core photonic crystal fiber," CLEO/Europe-EQEC 2009, June 14-19, 2009, Munich, Germany, CH1.4.
S. Selleri, E. Coscelli, A. Cucinotta, F. Poli, D. Passaro, "Air-suspended solid core fibers for sensing," SPIE Europe Optics and Optoelectronics 2009, April 20-23, 2009, Prague, Czech Republic, 7356-61.

National Journal Papers

National Conference Papers

F. Poli, G. Ciletti, E. Coscelli, A. Cucinotta, S. Selleri, "Influence of inner cladding geometry on symmetry-free photonic crystal fiber properties under severe heat load," XXI RiNEm, September 12-14, 2016, Parma.
E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, "Single-mode regime of Yb-doped SF-PCFs under severe heat load," Fotonica 2016, June 6-8, 2016, Roma.
E. Coscelli, F. Poli, A. Cucinotta, S. Selleri , "Tailoring of Dispersion Properties in Chalcogenide Suspended CoreFibers for Mid-Infrared Nonlinear Applications," Fotonica 2015, May 6-8, 2015, Torino, C6.4.
L. Rosa, E. Coscelli, F. Poli, A. Cucinotta, S. Selleri , "Thermal Gain Competition Full-Vector Modeling in Large-Mode-Area Yb-Doped Photonic-Crystal Fiber," Fotonica 2015, May 6-8, 2015, Torino, P2.9.
E. Coscelli, C. Molardi, F. Poli, A. Cucinotta, S. Selleri, "Photonic crystal fibers with reduced cladding symmetry for high power lasers," XX RiNEm, September 15-18, 2014, Padova, Italy, S2.3.
E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, "All-solid photonic bandgap fiber with microstructured cladding," XX RiNEm, September 15-18, 2014, Padova, Italy, P.29.
E. Coscelli, C. Molardi, F. Poli, A. Cucinotta, S. Selleri, "Symmetry-free designs of rod-type PCFs for high-power applications," Fotonica 2014, May 12-14. 2014, Naples, P1.12.
E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, "Comparison of thermally induced waveguide changes in large mode area double cladding photonic crystal fibers," FOTONICA 2013, 21-23 maggio 2013, Milano, C4.3.
R. Ana Perez-Herrera, E. Coscelli, M. Sozzi, A. Cucinotta, S. Selleri, M. Lopez-Amo, "YB-doped photonic crystal fiber laser," XIX RiNEm, 10-14 settembre 2012, Roma.
C. Molardi, Masruri, E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, "FEM solver optimization for PCF design," XIX RiNEm, 10-14 settembre 2012, Roma.
E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, "Air-hole ring influence on the cut-off proprieties of 19-cell double-cladding photonic crystal fibers," XIX RiNEm, 10-14 settembre 2012, Roma.
E. Coscelli, F.Poli, A. Cucinotta, S. Selleri, "Design guidelines for single-mode 19-cell Yb-doped double-cladding photonic crystal fibers," FOTONICA 2012, 15-17 maggio 2012, Firenze, P30.
F. Poli, E. Coscelli, A. Cucinotta, S. Selleri, "Enhanced filtering and bending properties of asymmetric hybrid photonic crystal fibers," FOTONICA 2012, 15-17 maggio 2012, Firenze, B3.2.
E. Coscelli, F. Poli, D. Passaro, A. Cucinotta, S. Selleri, T.T. Alkeskjold, L. Leick, J. Broeng, "Birifrangenza di una fibra a cristallo fotonico ibrida con proprietÃ di filtraggio spettrale distribuito," FOTONICA 2011, 9-11 Maggio 2011, Genova, P.11.
F. Poli, E. Coscelli, D. Passaro, A. Cucinotta, S. Selleri, T.T. Alkeskjold, L. Leick, J. Broeng, "Area efficace in fibre a cristallo fotonico polarizzanti drogate con Itterbio sottoposte a Bending," FOTONICA 2011, 9-11 Maggio 2011, Genova, P.12.
D. Passaro, G. Brunelli, E. Coscelli, F. Poli, A. Cucinotta, S. Selleri, "Sviluppo sperimentale di uno stadio di preamplificazione per un laser in fibra drogata con Itterbio ad alta potenza," FOTONICA 2011, 9-11 Maggio 2011, Genova, P.19.
S. Selleri, A. Cucinotta, F. Poli, D. Passaro, E. Coscelli, "Il progetto europeo ALPINE," XVIII Riunione Nazionale di Elettromagnetismo, 6-10 settembre 2010, Benevento.
E. Coscelli, F. Poli, D. Passaro, A. Cucinotta, S. Selleri, "Lunghezze d'onda di risonanza e anti-crossing in fibre a cristallo fotonico con reticolo kagome," XVIII Riunione Nazionale di Elettromagnetismo, 6-10 settembre 2010, Benevento.
E. Coscelli , M. Sozzi, D. Passaro, F. Poli, A. Cucinotta, S. Selleri, C. Lantano, R. Corradini, R. Marchelli, "Sviluppo di un biosensore in fibra a cristallo fotonico per il riconoscimento di sequenze di DNA," XVIII Riunione Nazionale di Elettromagnetismo, 6-10 settembre 2010, Benevento.
E. Coscelli, F. Poli, D. Passaro, M. Sozzi, A. Cucinotta, S. Selleri, C. Lantano, R. Corradini, R. Marchelli, "Analisi del DNA tramite biosensori in fibra microstrutturata," FOTONICA 2010, 25-27 maggio 2010, Pisa, C3.2.
F. Poli, E. Coscelli, D. Passaro, A. Cucinotta, S. Selleri, "Gain filtering dei modi di ordine superiore in fibre a cristallo fotonico rod-type drogate con itterbio," FOTONICA 2010, 25-27 maggio 2010, Pisa, P2.22.
F. Poli, E. Coscelli, D. Passaro, A. Cucinotta, S. Selleri, "Accoppiamento tra modi guidati e di cladding in fibre a cristallo fotonico polarizzanti," FOTONICA 2010, 25-27 maggio 2010, Pisa, P2.24.
D. Passaro, M. Sozzi, E. Coscelli, F. Poli, A. Cucinotta, A. Bononi, S. Selleri, "Laser impulsati in fibra drogata con itterbio," FOTONICA 2009, 27-29 maggio 2009, Pisa, B1.4.