Coleg Gwyddoniaeth a Pheirianneg

  1. Cyfraniad i Gynhadledd › Ymchwil › Heb ei adolygu gan gymheiriaid
  2. Cyhoeddwyd

    Effects of Artificial UV weathering and soft rot decay on heat treated wood

    Hale, M., Ghosh, S. C. & Spear, M., 24 Ebr 2005, International Research Group on Wood Protection: Working Papers. 13 t. IRG/WP 05-40302

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  3. Cyhoeddwyd

    Effects of Methyl Methacrylate impregnation on durability of timber.

    Curling, S., Spear, M., Ormondroyd, G. & Gibson, R., 7 Medi 2017, Building with bio-based materials: Best practice and performance specification: Final Cost ation FP1303 Conference. University of Zagreb

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  4. Cyhoeddwyd

    Emissions from bio-based building products

    Clauder, L., Ormondroyd, G., Mansour, E. & Pfriem, A., 1 Maw 2017, COST FP1303 Design, Application and Aesthetics of biobased building materials. Sofia, t. 1-2 2 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  5. Cyhoeddwyd

    Evaluation of spatial contamination patterns for norovirus and faecal indicator bacteria near to a coastal sewage discharge using Mytilus edulis as biosentinels

    Winterbourn, J. B., Clements, K., Malham, S., McDonald, J. & Jones, D. L., Ion 2013, 92 McLeod et al (eds.). Proc. 9th Int. Conf. Molluscan Shellfish Safety . t. 89-92

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  6. Cyhoeddwyd

    Fertilization success of the circumpolar Antarctic Seastar Odontaster validus: A diver-collected study

    Grange, L., Tyler, P. & Peck, L., 2011, Proceedings of the American Academy of Underwater Sciences 30th Symposium. Pollock, N. W. (gol.). t. 140-151 12 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  7. Cyhoeddwyd

    Fluid flow in wood: investigation of the influence of laser incision parameters on uptake and flow paths in four wood species

    Spear, M., Holmberg, J., Nath, S., Pitman, A., Waugh, D., Mason, P., Curling, S. & Ormondroyd, G., 26 Meh 2018, Timber 2018. Spear, M. (gol.). London, t. 137-144 8 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  8. Cyhoeddwyd

    Hot Oil and Resin Treated Timber: Resistance to Decay by Brown Rot Fungi

    Spear, M., Fowler, P., Hill, C. & Elias, R., 20 Medi 2006, Proceedings of ECOWOOD2006, 2nd International Conference on Environmentally-Compatible Forest Products. Fernando Pessoa University, Porto, 9 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  9. Cyhoeddwyd

    Implications of synergistic durability relationships on design of construction elements.

    Curling, S. & Ormondroyd, G., 1 Maw 2017, COST FP1303 Design, Application and Aesthetics of biobased building materials. Sofia: European Cooperation in Science and Technology (COST), t. 17-18 2 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  10. Cyhoeddwyd

    Innovative 2D-nanomaterial integrated optical fibre sensors for biochemical applications: (Invited Paper)

    Chen, X., Andrés, M. V. & Zhang, L., 9 Mai 2018, Micro-Structured and Specialty Optical Fibres V. SPIE, (Proceedings of SPIE; Cyfrol 10681).

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  11. Cyhoeddwyd

    Insights into stability of glued joints between thermally modified timber: adaptation of an artificial weathering test

    Spear, M., Teciu, R. & Ormondroyd, G., 17 Medi 2018, Proceedings of 9th European Conference on Wood Modification. Creemers, J. (gol.). 6 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  12. Cyhoeddwyd

    Measuring tidal hydrodynamics and bedform evolution in the Dee estuary

    Bolaños, R., Souza, A. J., Bell, P. & Malarkey, J., 2009, Proceedings of the 6th Symposium on River, Coastal and Estuarine Morphodynamics (RCEM 2009): Santa Fe, Argentina, 21-25 Sep. 2009. CRC Press/Balkema, Cyfrol 2. t. 709-714

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  13. Cyhoeddwyd

    Natural Fibre Reinforced Polypropylene Composites: Assessing the Potential of Hemp and TMP Fibre

    Spear, M., Hill, C. & Tomkinson, J., 9 Hyd 2002, Proceedings of the 6th European Panel Products Symposium.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  14. Cyhoeddwyd

    Physical properties and durability of methacrylate impregnated timber

    Curling, S., Spear, M., Ormondroyd, G. & Gibson, R., 28 Medi 2017, Proceedings of the 13th Annual Northern European Network for Wood Science and Engineering Conference. Copenhagen: Univeristy Of Copenhagen

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  15. Cyhoeddwyd

    Properties of wood following treatment with a modified hot oil

    Jones, D., Tjeerdsma, B., Spear, M. & Hill, C., 6 Hyd 2005, Proceedings of the 2nd European Conference on Wood Modification. Militz, H. & Hill, C. (gol.). Goettingen, Germany, t. 202-207 6 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  16. Cyhoeddwyd

    Review of the use of PF and related resins for modification of solid wood

    Stefanowski, B., Spear, M. & Pitman, A., 26 Meh 2018, Timber 2018. Spear, M. (gol.). London, t. 165-179 15 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  17. Cyhoeddwyd

    Strategies to reach zero carbon beef and sheep production on Welsh farms

    McNicol, L., Williams, P., Styles, D., Rees, R. M. & Chadwick, D., 1 Ebr 2022, Animal - science proceedings. 1 gol. Cyfrol 13. t. 8-9

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  18. Cyhoeddwyd

    Transcrystalline Interphases in Polypropylene Composites: Exploring the Possibilities

    Spear, M., Hill, C. & Tomkinson, J., 19 Mai 2005, Proceedings of the 7th International Conference on Woodfiber-Plastic Composites (and other natural fibers). Madison, WI: Forest Products Society, t. 49-57 8 t.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  19. Heb ei Gyhoeddi

    Water-Energy Nexus: Efficiencies and Sustainability in Demand Management

    Bello-Dambatta, A. & Williams, P., 8 Medi 2019, (Heb ei Gyhoeddi) Global Network for Researchers.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  20. Cyhoeddwyd

    Wood Plastic Composites: surface modification with heat to improve the adhesion ability

    Dimitriou, A., Spear, M. & Hale, M., 7 Medi 2015, Advances in modified and functional bio-based surfaces, Proceedings of COST Action FP1006.

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadledd

  21. Cofnod mewn Gwyddoniadur/Geiriadur › Ymchwil › Adolygwyd gan gymheiriaid
  22. Cyhoeddwyd

    Extremophiles and Acidic Environments

    Johnson, D. B. & Aguilera, A., 2019, Encyclopedia of Microbiology . 4tk gol. t. 206-227

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCofnod mewn Gwyddoniadur/Geiriaduradolygiad gan gymheiriaid

  23. Cofnod mewn Gwyddoniadur/Geiriadur › Ymchwil › Heb ei adolygu gan gymheiriaid
  24. Cyhoeddwyd

    Compass orientation

    Kishkinev, D., Vonk, J. (gol.) & Shackelford, T. (gol.), 8 Chwef 2019, Encyclopedia of Animal Cognition and Behavior. Springer Nature

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCofnod mewn Gwyddoniadur/Geiriadur

  25. Cyhoeddwyd

    Soil Resources, the Delivery of Ecosystem Services and Value

    Robinson, D., Seaton, F., Sharps, K., Thomas, A., Parry Roberts, F., van der Ploeg, M., Jones, L., Stolte, J., Puig de la Bellasca, M., Harrison, P. A. & Emmett, B., 1 Tach 2017, Oxford Research Encyclopedia of Environmental Science. OUP

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCofnod mewn Gwyddoniadur/Geiriadur

  26. Pennod › Ymchwil › Adolygwyd gan gymheiriaid
  27. Cyhoeddwyd

    A bioassay study of soils in the Blue Mountains of Jamaica

    Healey, J., 1989, Mineral Nutrients in Tropical Forest and Savanna Ecosystems : Special publication no. 9 of the British Ecological Society. Proctor, J. (gol.). Oxford: Blackwell Scientific, t. 273-288

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

  28. Cyhoeddwyd

    A conceptual methodology for estimating stored sequestered carbon in the built environment

    Spear, M., Hill, C. & Price, C., Ion 2021, Smart Innovation, Systems and Technologies, Vol 23, Sustainability and energy in buildings 2020. Littlewood, J. (gol.). Cyfrol 23. t. 381-393 12 t.

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

  29. Cyhoeddwyd

    ASSESSMENT AND MONITORING OF AESTHETIC APPEARANCE OF BUILDING BIOMATERIALS DURING THE SERVICE LIFE

    Sandak, A., Sandak, J., Dimitriou, A., Burud, I., Thiis, T., Gobakken, L. R., Ormondroyd, G. A. & Kraniotis, D., 2018, SUSTAINABLE DEVELOPMENT AND PLANNING IX. Cyfrol 226. t. 527-536 (WIT Transactions on Ecology and the Environment).

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

  30. Cyhoeddwyd

    Acidophile microbiology in space and time

    Johnson, D. B. & Quatrini, R., 2016, Acidophiles: Life in Extremely Acidic Environments. Johnson, D. B. & Quatrini, R. (gol.). Caister Academic Press Limited, t. 3-16

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

  31. Cyhoeddwyd

    Aerobic Hydrocarbon-Degrading Gammaproteobacteria: Oleiphilaceae and Relatives

    Golyshin, P., Jaeger, K-E., Toshchakov, S. V., Golyshina, O., Chernikova, T., Yakimov, M. M. & Ferrer, M., 27 Tach 2019, Handbook of Hydrocarbon and Lipid Microbiology Series. Taxonomy, Genomics and Ecophysiology of Hydrocarbon-Degrading Microbes. McGenity, T. J. (gol.). Springer, t. 153-166

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

  32. Cyhoeddwyd

    Agri-Food Wastes and Biomass Valorization: Establishing Experimental Conditions to Produce Lignin-Degrading Enzymes on Wheat Bran by Trametes versicolor CM13 Using Solid State Fermentation

    Charlton, A. & Baker, P., Rhag 2023, Agri-Food Wastes and Biomass Valorization: Establishing Experimental Conditions to Produce Lignin-Degrading Enzymes on Wheat Bran by Trametes versicolor CM13 Using Solid State Fermentation. MDPI AG, t. 53-66 13 t.

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

  33. Cyhoeddwyd

    Amazon Unbound: Utopia and Emancipation under Conditions of Planetary Urbanization

    Wilson, J., Ion 2018, Public Space Unbound: Urban emancipation and the post-political condition. Routledge

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

  34. Cyhoeddwyd

    Amazon Unbound: Utopian Dialectics of Planetary Urbanization

    Wilson, J., Maw 2018, Public Space Unbound. Routledge

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

  35. Cyhoeddwyd

    Anamorphosis of Capital: Black Holes, Gothic Monsters, and the Will of God

    Wilson, J., 1 Medi 2018, Psychoanalysis and the GlObal. Kapoor, I. (gol.). University of Nebraska Press

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

  36. Cyhoeddwyd

    Bacterial biota of forest trees

    Pettifor, B. & McDonald, J., Awst 2021, Forest Microbiology: Tree Microbiome: Phyllosphere, Endosphere and Rhizosphere. Asiegbu, F. O. & Kovalchuk, A. (gol.). 1 gol. Academic Press, Elsevier, Cyfrol 1. t. 161 - 173 12 t.

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

  37. Cyhoeddwyd

    Batch Foaming of Amorphous Poly (DL-Lactic Acid) and Poly (Lactic Acid-co-Glycolic Acid) with Supercritical Carbon Dioxide: CO2 Solubility, Intermolecular Interaction, Rheology and Morphology

    Tai, H., 7 Maw 2012, Rheology. De Vicente, J. (gol.). INTECH, t. 133-148

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

  38. Cyhoeddwyd

    Best Practices Toward Sustainable Ecotourism

    Shannon, G., 27 Mai 2017, Ecotourism’s Promise and Peril. Germany: Springer International Publishing, t. 153-178 26 t.

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

  39. Cyhoeddwyd

    Biological removal of sulfurous compounds and metals from inorganic wastewaters

    Johnson, B. & Santos, A. L., Hyd 2020, Environmental Technologies to Treat Sulfur Pollution: Principles and Engineering. Lens, P. N. L. (gol.). 2nd gol. IWA Publishing, t. 215-246

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

  40. Cyhoeddwyd

    British red squirrel strongholds: challenges for conservation

    Gurnell, J., Blackett, T., Butler, H., Lurz, P. W. W., Magris, L. & Shuttleworth, C., 2015, Red squirrels: Ecology, Conservation & Management in Europe. Shuttleworth, C. M., Lurz, P. W. W. & Hayward, M. W. (gol.). European Squirrel Initiative, t. 211-232

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

  41. Cyhoeddwyd

    Can In-Situ Soil Nitrate Measurements Improve Nitrogen-Use Efficiency in Agricultural Systems?

    Jones, D. L., Chadwick, D. R., Rengaraj, S., Wu, D., Williams, A. P., Hill, P. W., Miller, A. J., Lark, R. M., Rosolem, C. A., Damin, V. & Shaw, R., 1 Rhag 2018, Proceedings 1466-1314. International Fertiliser Society, Cyfrol 825. t. 1-32 32 t. 825

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

  42. Cyhoeddwyd

    Changing Hydrology: A UK Perspective

    Robins, P. & Lewis, M., 2019, Coasts and estuaries: The future. Wolanski, E., Day, J., Elliott, M. & Ramachandran, R. (gol.). Burlington: Elsevier, t. 611-617 6 t.

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

  43. Cyhoeddwyd

    Climate change impacts on non-human primates: what have we modelled and what do we do now?

    Winder, I. C., Mace, B. D. & Korstjens, A. H., 2 Ion 2023, Primates in Anthropogenic Landscapes: Exploring Primate Behavioural Flexibility Across Human Contexts. McKinney, T., Waters, S. & Rodrigues, M. A. (gol.). Springer Nature

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

  44. Cyhoeddwyd

    Composition, structure and regeneration of miombo forest at Kitulangalo, Tanzania

    Obiri, J., Hall, J. & Healey, J., 4 Awst 2010, Degraded forests in Eastern Africa: Management and Restoration. Bongers, F. & Tennigkeit, T. (gol.). London: Earthscan, t. 109-122 (The Earthscan Forest Library).

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

  45. Cyhoeddwyd

    Compounds Containing the Boron–Chalcogen B–E (E[double bond, length half m-dash]S, Se, Te) Bond

    Beckett, M., 2007, Handbook of Chalcogen Chemistry: New Perspectives in Sulfur, Selenium and Tellurium . Royal Society of Chemistry, t. 1-30

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

  46. Cyhoeddwyd

    Confusion reigns? A review of marine megafauna interactions with tidal stream environments

    Benjamins, S., Dale, A. C., Hastie, G., Waggitt, J. J., Lea, M-A., Scott, B. & Wilson, B., 2015, Oceanography and Marine Biology: An Annual Review. Cyfrol 53. t. 1-54

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

  47. Cyhoeddwyd

    Contour hedgerows of Calliandra calothyrsus Meissn. for soil and water conservation in the Blue Mountains of Jamaica

    McDonald, M., Stevens, P. A. & Healey, J., 2001, Sustaining the Global Farm – Selected Papers from the 10th International Soil Conservation Organization Meeting. Stott, D. E., Mohtar, R. H. & Steinhardt, G. C. (gol.). West Lafayette, Indiana, USA: International Soil Conservation Organization , t. 395-402

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

  48. Cyhoeddwyd

    Coordinated Multiple Views for Exploratory GeoVisualization

    Roberts, J. C., 2008, Geographic Visualization. Dodge, M., McDerby, M. & Turner, M. (gol.). John Wiley & Sons, Ltd, t. 25-48 24 t.

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

  49. Cyhoeddwyd

    Current approaches and future trends in compost quality criteria for agronomic, environmental and human health benefits

    Bernal, M. P., Sommer, S., Chadwick, D., Qing, C., Li, G. & Michel Jr, F., 2017, Advances in Agronomy. Cyfrol 144. t. 143-233

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

  50. Cyhoeddwyd

    Degradation, species invasion and management in Tanzanian dry forests: what do local people say?

    Obiri, J., Hall, J. & Healey, J., 4 Awst 2010, Degraded forests in Eastern Africa: Management and Restoration. Bongers, F. & Tennigkeit, T. (gol.). London: Earthscan, t. 305-321 (The Earthscan Forest Library).

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

  51. Cyhoeddwyd

    Design considerations for eDNA metabarcoding surveys

    Perry, W. B., Pillay, K., George, P., Brennan, G., Lowe, A., Jones, L., Holman, L., Gibson, T., de Vere, N. & Creer, S., 19 Ion 2024, Applied Environmental Genomics. Berry, O. F., Holleley, C. E. & Jarman, S. N. (gol.). CRC Press

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

  52. Cyhoeddwyd

    Developing integrated and applied red squirrel conservation programmes: What lessons can Europe learn from a regional grey squirrel eradication programme in North Wales?

    Shuttleworth, C., Schuchert, P., Everest, D. J., McInnes, C. J., Rushton, S. P., Jackson, N. & Kenward, R. E., 2015, Red squirrels: Ecology, Conservation & Management in Europe. Shuttleworth, C. M., Lurz, P. W. W. & Hayward, M. W. (gol.). European Squirrel Initiative, t. 233-250

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

  53. 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

  54. Cyhoeddwyd

    Diversity and Physiologies of acidophilic Archaea

    Golyshina, O., 1 Ebr 2016, Acidophiles: Life in Extremely Acidic Environments. Quatrini, R. & Johnson, D. B. (gol.). Caister Academic Press Limited, t. 93-07

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