Coleg Gwyddoniaeth a Pheirianneg

  1. Erthygl adolygu › Ymchwil › Adolygwyd gan gymheiriaid
  2. Cyhoeddwyd

    A perspective on using experiment and theory to identify design principles in dye-sensitized solar cells

    Holliman, P. J., Kershaw, C., Connell, A., Jones, E. W., Hobbs, R., Anthony, R., Furnell, L., McGettrick, J., Geatches, D. & Metz, S., 11 Gorff 2018, Yn: SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS. 19, 1, t. 599-612

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygl adolyguadolygiad gan gymheiriaid

  3. Cyhoeddwyd

    Progress on improving Agricultural Nitrogen use efficiency: UK-China viortual joint centers on Nitrogen Agronomy

    Misselbrook, T., Bai, Z., Cai, Z., Cao, W., Carswell, A., Cowan, N., Cui, Z., Chadwick, D. R., Emmett, B., Goulding, K., Jiang, R., Jones, D. L., Ju, X., Liu, H., Lu, Y., Ma, L., Powlson, D., Rees, R. M., Skiba, U., Smith, P., Sylvester-Bradley, R., Williams, J., Wu, L., Xu, M., Xu, W., Zhang, F., Zhang, J., Zhou, J. & Liu, X., 1 Medi 2022, Yn: Frontiers of Agricultural Science and Engineering. 9, 3, t. 475-489

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygl adolyguadolygiad gan gymheiriaid

  4. Adoddiad Arall › Ymchwil › Heb ei adolygu gan gymheiriaid
  5. Cyhoeddwyd
  6. Cyhoeddwyd

    Parque Marino Cabo de Hornos - Diego Ramirez [Technical report]

    Rozzi, R., Massardo, F., Mansilla, A., Squeo, F. A., Barros, E., Contandor, T., Frangopulos, M., Poulin, E., Rosenfeld, S., Goffinet, B., C., G-W., R., M., Crego, R. D., Viddi, F., Naretto, J., Gallardo, M. R., Jiménez, J. E., Marambio, J., Pérez, C., Rodríguez, J. P., Méndez, F., Barroso, O., Rendoll, J., Schuttler, E., Kennedy, J., Convey, P., Russell, S., Berchez, F., Sumida, P. Y. G., Rundell, P., Rozzi, A., Armesto, J., Kalin-Arroyo, M. & Martinic, M., 20 Rhag 2017, Ediciones Universidad de Magallanes. 52 t.

    Allbwn ymchwil: Llyfr/AdroddiadAdoddiad Arall

  7. Adroddiad Comisiwn › Ymchwil › Heb ei adolygu gan gymheiriaid
  8. Cyhoeddwyd

    SEALER-UK Deliverable 1: UK-BEIS Advanced Modular Reactor Competition - Phase 1

    Middleburgh, S. & Wallenius, J., 14 Ion 2019, 127 t.

    Allbwn ymchwil: Llyfr/AdroddiadAdroddiad Comisiwn

  9. Cyhoeddwyd

    Science to Policy: Climate-proofing grassland productivity

    Wiik, E., Jones, D. L., Chadwick, D., Hill, P., Sanchez Rodriguez, A., Dodd, R., Turner, R., Kingston-Smith, A., Gwynn-Jones, D., Doonan, J., Scullion, J., Loka, D., Hayes, F., Robinson, D. & Toberman, H., Maw 2019, Ser Cymru National Research Network for Low Carbon, Energy and Environment. (Science to Policy)

    Allbwn ymchwil: Llyfr/AdroddiadAdroddiad Comisiwn

  10. Cyhoeddwyd

    Science to Policy: Impacts of trees on farm ecosystem services

    Wiik, E., Toberman, H., Ford, H., Webb, B., Healey, J., Pagella, T., Marley, C. & Smith, A., 19 Maw 2019, Ser Cymru National Research Network for Low Carbon, Energy and Environment. 8 t.

    Allbwn ymchwil: Llyfr/AdroddiadAdroddiad Comisiwn

  11. Cyhoeddwyd

    Science to Policy: Nature-based solutions for the built environment

    Wiik, E., Ormondroyd, G., Spear, M., Curling, S., Raghavalu Thirumalai Prabhakaran, D., Donnison, I., Robson, P., Bosch, M., Wootton-Beard, P. C., Hindhaugh, R., Jones, P., Waldron, D., Xing, Y. & Toberman, H., Maw 2019, Ser Cymru National Research Network for Low Carbon, Energy and Environment. (Science to Policy)

    Allbwn ymchwil: Llyfr/AdroddiadAdroddiad Comisiwn

  12. Cyhoeddwyd

    Science to Policy: Opportunities for geologic carbon capture and geothermal energy in Wales

    Wiik, E., Toberman, H., Mitchell, A., Edwards, A., Evans, A., Thomas, A., Wilding, M., Rassner, S., Soares, A., Tripathy, S., Thomas, H., Masum, S., Almolliyeh, M., Schofield, D., Bentham, M., Farr, G. & Gamboa, D., Maw 2019, Ser Cymru National Research Network for Low Carbon, Energy and Environment. (Science to Policy)

    Allbwn ymchwil: Llyfr/AdroddiadAdroddiad Comisiwn

  13. Cyhoeddwyd

    Science to Policy: Salt Marsh Resilience and Coastal Management

    Wiik, E., Toberman, H., Skov, M., Jenkins, S., Pages Fauria, J., Ballinger, R., McKinley, E., Hall, C., Griffin, J., Fowler, M. S., de Battisti, D. & Garbutt, A., Maw 2019, Ser Cymru National Research Network for Low Carbon, Energy and Environment. (Science to Policy)

    Allbwn ymchwil: Llyfr/AdroddiadAdroddiad Comisiwn

  14. Cyhoeddwyd

    Science to Policy: Sustainable Intensification of Dairy Farming

    Wiik, E., Toberman, H., Gibbons, J., Styles, D., Soteriades, A., Gonzalez Mejia, A., Moorby, J., Foskolos, A., Munday, M., Rafique, A. & Wilson, P., Maw 2019, Ser Cymru National Research Network for Low Carbon, Energy and Environment. (Science to Policy)

    Allbwn ymchwil: Llyfr/AdroddiadAdroddiad Comisiwn

  15. Cyhoeddwyd

    Science to Policy: The role of marine renewable energy in a low carbon future

    Wiik, E., Neill, S., Lewis, M., Robins, P., O'Doherty, T., Toberman, H., Pan, S., Ebdon, T., Masters, I. & Togneri, M., Maw 2019, Ser Cymru National Research Network for Low Carbon, Energy and Environment. (Science to Policy)

    Allbwn ymchwil: Llyfr/AdroddiadAdroddiad Comisiwn

  16. Llyfr › Ymchwil › Heb ei adolygu gan gymheiriaid
  17. Cyhoeddwyd

    Advances in Reintroduction Biology of Australian and New Zealand Fauna

    Hayward, M. W., Armstrong, D. P. (gol.), Hayward, M. W. (gol.), Moro, D. (gol.) & Seddon, P. J. (gol.), 6 Tach 2015, 2015 gol. CSIRO Publishing.

    Allbwn ymchwil: Llyfr/AdroddiadLlyfr

  18. Cyhoeddwyd

    Art forms from the Abyss: Ernst Haeckel's images from the HMS Challenger Expedition

    Williams, P. J. L., Evans, D. W., Roberts, D. J. & Thomas, D. N., 1 Medi 2015, 1 gol. Munich, London New York: Prestel Publishing Ltd. 143 t.

    Allbwn ymchwil: Llyfr/AdroddiadLlyfr

  19. Cyhoeddwyd

    BERRU Predictive Modeling: Best Estimate Results with Reduced Uncertainties

    Cacuci, D., 18 Chwef 2019, Heidelberg/New York: Springer Verlag. 392 t.

    Allbwn ymchwil: Llyfr/AdroddiadLlyfr

  20. Cyhoeddwyd

    Computational Methods for Data Evaluation and Assimilation

    Cacuci, D., Navon, I. M. & Ionescu-Bujor, M., 21 Awst 2013, Boca Roaton: Chapman and Hall/CRC. 373 t.

    Allbwn ymchwil: Llyfr/AdroddiadLlyfr

  21. Cyhoeddwyd

    Iaith a Thechnoleg yng Nghymru: Cyfrol I

    Prys, D. (gol.), Jones, D., Prys, G., Watkins, G., Cooper, S., Roberts, J. C., Butcher, P., Farhat, L., Teahan, W. & Prys, M., 5 Hyd 2021, Bangor: Prifysgol Bangor University. 120 t.

    Allbwn ymchwil: Llyfr/AdroddiadLlyfr

  22. Cyhoeddwyd

    Language and Technology in Wales: Volume I

    Prys, D. (gol.), Jones, D., Prys, G., Watkins, G., Cooper, S., Roberts, J. C., Butcher, P., Farhat, L., Teahan, W. & Prys, M., 5 Hyd 2021, Bangor: Prifysgol Bangor University. 120 t.

    Allbwn ymchwil: Llyfr/AdroddiadLlyfr

  23. Cyhoeddwyd

    Sea Ice

    Thomas, D. N. (gol.), 1 Ion 2017, 3 gol. Wiley-Blackwell. 728 t.

    Allbwn ymchwil: Llyfr/AdroddiadLlyfr

  24. Cyhoeddwyd

    The Second-Order Adjoint Sensitivity Analysis Methodology

    Cacuci, D., 28 Chwef 2018, 1st gol. Boca Raton: Chapman and Hall/CRC. 306 t. (Advances in Appled Mathematics)

    Allbwn ymchwil: Llyfr/AdroddiadLlyfr

  25. Crynodeb › Ymchwil › Adolygwyd gan gymheiriaid
  26. Cyhoeddwyd

    ColloCaid: Assisting Writers with Academic English Collocations

    Frankenberg-Garcia, A., Lew, R., Rees, G., Roberts, J. C., Sharma, N. & Butcher, P., Hyd 2019. 2 t.

    Allbwn ymchwil: Cyfraniad at gynhadleddCrynodebadolygiad gan gymheiriaid

  27. Cyhoeddwyd

    Slipping through the cracks of e-lexicography: lessons from ColloCaid

    Rees, G., Frankenberg-Garcia, A., Lew, R., Roberts, J. C., Sharma, N. & Butcher, P., Hyd 2019.

    Allbwn ymchwil: Cyfraniad at gynhadleddCrynodebadolygiad gan gymheiriaid

  28. Crynodeb › Ymchwil › Heb ei adolygu gan gymheiriaid
  29. Cyhoeddwyd

    Collocations in e-lexicography: lessons from Human Computer Interaction research”

    Frankenberg-Garcia, A., Lew, R., Roberts, J. C., Rees, G., Sharma, N. & Butcher, P., 30 Medi 2019. 2 t.

    Allbwn ymchwil: Cyfraniad at gynhadleddCrynodeb

  30. Murlen › Ymchwil › Heb ei adolygu gan gymheiriaid
  31. Cyhoeddwyd

    Raising science attitudes and perceptions at Key Stage 3

    Withers, E., McCallum, D., Campbell, K., Owen, J. H., Jones, S. & Murphy, L., 11 Meh 2020.

    Allbwn ymchwil: Cyfraniad at gynhadleddMurlen

  32. Papur › Ymchwil › Adolygwyd gan gymheiriaid
  33. Cyhoeddwyd

    3D visualisations Should Not be Displayed Alone – Encouraging a Need for Multivocality in Visualisation

    Roberts, J. C., Mearman, J., Butcher, P., Al-Maneea, H. M. A. & Ritsos, P. D., Medi 2021. 9 t.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapuradolygiad gan gymheiriaid

  34. Cyhoeddwyd

    Co-creating an online learning environment to support academic writing: Lessons learnt in an interdisciplinary setting

    Sharma, N., Rees, G., Butcher, P., Lew, R., Frankenberg-Garcia, A. & Roberts, J. C., 20 Hyd 2019. 5 t.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapuradolygiad gan gymheiriaid

  35. Cyhoeddwyd

    ColloCaid: a tool to help academic English writers find the words they need

    Frankenberg-Garcia, A., Rees, G., Lew, R., Roberts, J. C., Sharma, N. & Butcher, P., 9 Rhag 2019, t. 144-150. 7 t.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapuradolygiad gan gymheiriaid

  36. Cyhoeddwyd

    Natural insulation fibres for the absorption of indoor volatile organic compounds

    Ormondroyd, G., Curling, S., Mansour, E. & Marriott, R., 2015.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapuradolygiad gan gymheiriaid

  37. Cyhoeddwyd

    Tangible papercraft visualisations for education

    Mearman, J., Butcher, P., Ritsos, P. D. & Roberts, J. C., 4 Mai 2019.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapuradolygiad gan gymheiriaid

  38. Papur › Ymchwil › Heb ei adolygu gan gymheiriaid
  39. Cyhoeddwyd

    Foods from catchment to coast – responsible development of rural foodscapes

    Lane, E., Jones, R. & Ricketts Hein, J., 4 Mai 2017.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  40. Cyfraniad i Gynhadledd › Ymchwil › Adolygwyd gan gymheiriaid
  41. Cyhoeddwyd

    Visualising collocation for close writing

    Roberts, J. C., Butcher, P., Lew, R., Rees, G., Sharma, N. & Frankenberg-Garcia, A., 27 Mai 2020, Visualising Collocation for Close Writing. Kerren, A., Garth, C. & Marai, E. G. (gol.). The Eurographics Association

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadleddadolygiad gan gymheiriaid

  42. Pennod › Ymchwil › Adolygwyd gan gymheiriaid
  43. Cyhoeddwyd

    Developing integrated red squirrel conservation in Europe

    Shuttleworth, C., Lurz, P. & Hayward, M., Mai 2016, Red Squirrels: Ecology, Conservation and Management in Europe. Shuttleworth, C. M., Lurz, P. & Hayward, M. W. (gol.). European Squirrel Initiative, t. 319-330

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddPennodadolygiad gan gymheiriaid

  44. Cyhoeddwyd

    Nature-based solutions for climate change in the UK - Peatlands

    Dunn, C., Burden, A., Chamberlain, B., Danek, S., Evans, C., Freeman, C., Harvey, R., Proctor, S. & Walker, J., 12 Mai 2021, Nature-based solutions for climate change in the UK. British Ecological Society

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddPennodadolygiad gan gymheiriaid

  45. Cyhoeddwyd

    Sea Ice, Ice Drift, and Oceanic Circulation

    Thomas, D. N., Cottier, F. R. & Brandon, M. A., 6 Maw 2017, The International Encyclopedia of Geography: : People, the Earth, Environment and Technology. Richardson, D., Castree, N., Goodchild, M. F., Kobayashi, A., Liu, W. & Marston, R. A. (gol.). 1 gol. John Wiley & Sons, t. 6075-6084 10 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddPennodadolygiad gan gymheiriaid

  46. Cyhoeddwyd

    The Intertidal Zone of the North-East Atlantic Region: Pattern and Process

    Hawkins, S. J., Pack, K. E., Firth, L. B., Mieszkowska, N., Evans, A. J., Martins, G. M., Åberg, P., Adams, L. C., Arenas, F., Boaventura, D. M., Bohn, K., Borges, C. D. G., Castro, J. J., Coleman, R. A., Crowe, T. P., Cruz, T., Davies, M. S., Epstein, G., Faria, J., Ferreira, J. G., Frost, N. J., Griffin, J. N., Hanley, ME., Herbert, R. J. H., Hyder, K., Johnson, M. P., Lima, F. P., Masterson-Algar, P., Moore, P. J., Moschella, P. S., Notman, G. M., Pannacciulli, F. G., Ribeiro, P. A., Santos, A. M., Silva, A. C. F., Skov, M. W., Sugden, H., Vale, M., Wangkulangkul, K., Wort, E. J. G., Thompson, R. C., Hartnoll, R. G., Burrows, M. T. & Jenkins, S. R., Medi 2019, Interactions in the Marine Benthos: Global Patterns and Processes. Hawkins, S. J., Bohn, K., Firth, L. B. & Williams, G. A. (gol.). 1 gol. Cambridge: Cambridge University Press, Cyfrol 87. t. 7-46 40 t. (Systematics Assocations; Cyfrol Special Volume 87).

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddPennodadolygiad gan gymheiriaid

  47. Pennod › Ymchwil › Heb ei adolygu gan gymheiriaid
  48. Cyhoeddwyd

    Future directions in reintroduction biology of Australian and New Zealand Fauna

    Moro, D., Hayward, M. W., Seddon, P. J., Armstrong, D. P. & Hayward, M. W. (gol.), 6 Tach 2015, Advances in Reintroduction Biology of Australian and New Zealand Fauna. 2015 gol. CSIRO Publishing

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddPennod

  49. Cyhoeddwyd

    Management of reintroduced wildlife populations

    Hayward, M. & Slotov, R., 18 Hyd 2016, Reintroduction of Fish and Wildlife Populations. California: University of California Press, t. 319-340

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddPennod

  50. Cyhoeddwyd

    Reassembly of the large predator guild in Hluhluwe-iMofolozi Park, South Africa

    Somers, M. J., Becker, P., Druce, D., Flacke, G., Graf, J., Gunther, M., Hayward, M. W., Marneweck, D., Paiz, M. M., Trinkle, M. & Cromsigt, J. P. (gol.), 1 Maw 2017, Conservation in Hluhluwe-iMfolozi: Africa's oldest National Park. 2014 gol. Elsevier, t. 286-310

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddPennod

  51. Llythyr › Ymchwil › Adolygwyd gan gymheiriaid
  52. Cyhoeddwyd

    Response to comments on "Compassionate Conservation deserves a morally serious rather than dismissive response - reply to Callen et al., 2020"

    Callen, A., Hayward, M. W., Klop-Toker, K., Allen, B. L., Ballard, G., Beranek, C. T., Broekhuis, F., Bugir, C. K., Clarke, R. H., Clulow, J., Clulow, S., Daltry, J. C., Davies-Mostert, H. T., Di Blanco, Y. E., Dixon, V., Fleming, P. J. S., Howell, L. G., Kerley, G. I. H., Legge, S. M., Lenga, D. J., Major, T., Montgomery, R. A., Moseby, K., Meyer, N., Parker, D. M., Periquet, S., Read, J., Scanlon, R. J., Shuttleworth, C., Tamessar, C. T., Taylor, W. A., Tuft, K., Upton, R. M. O., Valenzuela, M., Witt, R. R. & Wuster, W., 30 Ebr 2020, Yn: Biological Conservation. 244

    Allbwn ymchwil: Cyfraniad at gyfnodolynLlythyradolygiad gan gymheiriaid

  53. Erthygl › Ymchwil › Adolygwyd gan gymheiriaid
  54. Cyhoeddwyd

    A Paradigm-Shifting Methodology for Sensitivity Analysis of Multiplying Nuclear Systems

    Cacuci, D., Maw 2017, Yn: Nuclear Science and Engineering. 185, 3, t. 361-383

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  55. Cyhoeddwyd

    A high density composite fuel with integrated burnable absorber: U3Si2-UB2

    Turner, J., Middleburgh, S. & Abram, T., 1 Chwef 2020, Yn: Journal of Nuclear Materials. 529, 151891.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  56. Cyhoeddwyd

    A mutated dph3 gene causes sensitivity of Schizosaccharomyces pombe cells to cytotoxic agents

    Villahermosa Caballero, D., Knapp, K. & Fleck, O., Rhag 2017, Yn: Current Genetics. 63, 6, t. 1081-1091

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  57. Cyhoeddwyd

    A review of camera trapping for conservation behaviour research

    Caravaggi, A., Banks, P. B., Burton, A. C., Finlay, C. M. V., Haswell, P., Hayward, M., Rowcliffe, J. M. & Wood, M. D., Medi 2017, Yn: Remote Sensing in Ecology and Conservation. 3, 3, t. 109-122

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  58. Cyhoeddwyd

    Accounting for Dilution of SARS-CoV-2 in Wastewater Samples Using Physico-Chemical Markers

    Wilde, H., Perry, W. B., Jones, O., Kille, P., Weightman, A., Jones, D. L., Cross, G. & Durance, I., 15 Medi 2022, Yn: Water. 14, 18

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  59. Cyhoeddwyd

    Advanced Processing of Food Waste Based Digestate for Mitigating Nitrogen Losses in a Winter Wheat Crop

    Sanchez Rodriguez, A., Carswell, A. M., Shaw, R., Hunt, J., Saunders, K., Cotton, J., Chadwick, D., Jones, D. L. & Misselbrook, T. H., 17 Gorff 2018, Yn: Frontiers in Sustainable Food Systems.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  60. Cyhoeddwyd

    Anonymous nuclear markers for the African adders (Serpentes: Viperidae: Bitis)

    De Bruyn, M., Wuster, W., Barlow, A. & Grail, W., 1 Rhag 2012, Yn: Conservation Genetics Resources. 4, 4, t. 967-969

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  61. Cyhoeddwyd

    Bio-processing of a saline, calcareous copper sulfide ore by sequential leaching

    Pakostova, E., Grail, B. M. & Johnson, D. B., Awst 2018, Yn: Hydrometallurgy. 179, t. 36-43

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  62. Cyhoeddwyd

    Biodegradation of Polyactic Acid and starch composites in compost and soil

    Wilfred, O., Tai, H., Marriott, R., Liu, Q., Tverezovskiy, V., Curling, S., Fan, Z. & Wang, W., 25 Hyd 2018, Yn: International Journal of Nano Research. 1, 2, t. 1-11

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  63. Cyhoeddwyd

    Biodiversity in intertidal rock pools: Informing engineering criteria for artificial habitat enhancement in the built environment

    Firth, L. B., Schofield, M., White, F. J., Skov, M. W. & Hawkins, S. J., 1 Rhag 2014, Yn: Marine Environmental Research. 102, December, t. 122-130

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  64. Cyhoeddwyd

    Border Security Fencing and Wildlife: The End of the Transboundary Paradigm in Eurasia?

    Linell, J. D. C., Trouwborst, A., Botani, L., Kaczensky, P., Harber, D., Reljic, S., Kusak, J., Majic, A., Skrbinsek, T., Potocnik, H., Hayward, M., Milner-Gulland, E. J., Buuveibaatar, B., Olson, K. A., Badamjav, L., Bischof, R., Zuther, S. & Breitenmoser, U., 22 Meh 2016, Yn: PLoS Biology. 14, 6, e1002483.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

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