Cyhoeddiadau

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i
  1. Cyhoeddwyd

    Stress promotes maleness in hermaphroditic modular animals.

    Hughes, R. N., Manriquez, P. H., Bishop, J. D. & Burrows, M. T., 1 Medi 2003, Yn: Proceedings of the National Academy of Sciences of the USA. 100, 18, t. 10326-10330

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  2. Cyhoeddwyd

    Transcriptomics and in vivo tests reveal novel mechanisms underlying endocrine disruption in an ecological sentinel, Nucella lapillus

    Hughes, R. N., Pascoal, S., Carvalho, G. R., Vasieva, O., Hughes, R., Cossins, A., Fang, Y., Ashelford, K., Olohan, L., Barroso, C., Mendo, S. & Creer, S., 1 Maw 2013, Yn: Molecular Ecology. 22, 6, t. 1589-1608

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  3. Cyhoeddwyd

    Lessons in modularity: the evolutionary ecology of colonial invertebrates.

    Hughes, R. N., 1 Meh 2005, Yn: Scientia Marina. 69, Supplement 1, t. 169-179

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  4. Cyhoeddwyd

    Molecular phylogeny supports division of the 'cosmopolitan' taxon Celleporella (Bryozoa; Cheilostomata) into four major clades.

    Hughes, R. N., Gomez, A., Wright, P. J., Moyano, H. I., Cancino, J. M., Carvalho, G. R. & Lunt, D. H., 1 Ion 2008, Yn: Molecular Phylogenetics and Evolution. 46, 1, t. 369-374

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  5. Cyhoeddwyd

    Plastic and Heritable Components of Phenotypic Variation in Nucella lapillus: An Assessment Using Reciprocal Transplant and Common Garden Experiments

    Hughes, R. N., Pascoal, S., Carvalho, G. R., Creer, S., Rock, J., Kawaii, K., Mendo, S. & Hughes, R., 27 Ion 2012, Yn: PLoS ONE. 7, 1, t. e30289

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  6. Cyhoeddwyd

    Paradoxical polyembryony? Embryonic cloning in an ancient order of marine bryozoans

    Hughes, R. N., D'Amato, M. E., Bishop, J. D., Carvalho, G. R., Craig, S. F., Hansson, L. J., Harley, M. A. & Pemberton, A. J., 22 Meh 2005, Yn: Biology Letters. 1, 2, t. 178-180

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  7. Cyhoeddwyd

    Shore crabs are able to transfer learned handling skills to novel prey

    Hughes, R. N. & O'Brien, N., 1 Ebr 2001, Yn: Animal Behaviour. 61, 4, t. 711-714

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  8. Cyhoeddwyd

    Impact of relaxing Covid-19 social distancing measures on rural North Wales: a simulation analysis

    Hughes, R. P. & Hughes, D., 14 Rhag 2020, Yn: Frontiers in Public Health. 8, 562473.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  9. Cyhoeddwyd

    Smoking behaviours, access to cigarettes and relationships with alcohol in 15- and 16-year-old schoolchildren

    Hughes, S. K., Hughes, K., Atkinson, A. M., Bellis, M. A. & Smallthwaite, L., Chwef 2011, Yn: European Journal of Public Health. 21, 1, t. 8-14 7 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  10. Cyhoeddwyd

    Understanding quality of life and well-being for people living with advanced dementia.

    Hughes, S., Woods, R., Algar-Skaife, K. & Jones, C., 22 Maw 2019, Yn: Nursing Older People. 31, 2, t. 18-24 6 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  11. Cyhoeddwyd

    A Collaborative approach: Care staff and families working together to safeguard the quality of life of residents living with advanced dementia

    Hughes, S., Woods, R., Algar-Skaife, K., Jelley, H. & Jones, C., 13 Mai 2019, Yn: Journal of Central Nervous System Disease. 11, t. 1-9 9 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. Cyhoeddwyd

    The Effect of Trans-urethral Resection of the Bladder Tumour (TURBT) on Routine Haematological and Biochemical Blood Tests: A Clinical-pilot Observational Study

    Hughes, S. F., Lamb, R. M., Moyes, A., Ella-Tongwiis, P., Gill, A., Duckett, A. & Shergill, I., 1 Rhag 2020, Yn: International Journal of Biomedical Science. 16, 4, t. 68-74

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  13. Cyhoeddwyd

    The role of specific biomarkers, as predictors of post-operative complications following flexible ureterorenoscopy (FURS), for the treatment of kidney stones: a single-centre observational clinical pilot-study in 37 patients.

    Hughes, S. F., Moyes, A., Lamb, R. M., Ella-Tongwiis, P., Bell, C., Moussa, A. & Shergill, I., Awst 2020, Yn: BMC Urology. 14, 20, 122.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  14. Cyhoeddwyd

    The role of phagocytic leukocytes following flexible ureterenoscopy, for the treatment of kidney stones: an observational, clinical pilots-study

    Hughes, S. F., Moyes, A., Lamb, R. M., Ella-Tongwiis, P., Snyper, N. Y. F. & Shergill, I., 11 Rhag 2020, Yn: European Journal of Medical Research. 11, 25, 68.

    Allbwn ymchwil: Cyfraniad at gyfnodolynLlythyradolygiad gan gymheiriaid

  15. Cyhoeddwyd

    Shock wave lithotripsy, for the treatment of kidney stones, results in changes to routine blood tests and novel biomarkers: a prospective clinical pilot-study.

    Hughes, S. F., Jones, N., Thomas-Wright, S. J., Banwell, J., Moyes, A. & Shergill, I., 1 Meh 2020, Yn: European Journal of Medical Research. 1, 25, 18.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. Cyhoeddwyd

    The discovery of Haplophthalmus montivagus Verhoeff, 1941 (Isopoda: Oniscidea) at Treborth Botanic Garden, North Wales

    Hughes, T. & Hill, D., 2020, Yn: Bulletin of the British Myriapod and Isopod Group. 32, t. 65-67 3 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  17. Cyhoeddwyd

    The occurrence of Metatrichoniscoides leydigii (Weber, 1880) (Isopoda:Oniscidea) on the Ribble Estuary, Lancashire

    Hughes, T., 2020, Yn: Bulletin of the British Myriapod and Isopod Group. 32, t. 56-58 3 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  18. Cyhoeddwyd

    A new location for the rare French endemic woodlouse Alloschizidium pruvoti (Racovitza, 1907) (Oniscidea: Armadillidiidae)

    Hughes, T., 2020, Yn: Bulletin of the British Myriapod and Isopod Group. 32, t. 68-72 5 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  19. Cyhoeddwyd

    Observations on two woodlouse species (Isopoda; Oniscidea) new to North Wales: Metatrichoniscoides celticus Oliver & Trew, 1981 and Philoscia affinis Verhoeff, 1908

    Hughes, T., 2019, Yn: Bulletin of the British Myriapod and Isopod Group. 31, t. 44-51 8 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. Cyhoeddwyd

    Changing depocentre environments of Palaeolake Olduvai and carbonates as marker horizons for hiatuses and lake-level extremes

    Hughes, T., Stanistreet, I., Doyle, C., Rushworth, E., Stollhofen, H., Toth, N., Schick, K. & Njau, J., 15 Rhag 2020, Yn: Palaeogeography, Palaeoclimatology, Palaeoecology. 560, 110032.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  21. Cyhoeddwyd

    Transition to SCPHN: The effects of returning to student status

    Hughes Morris, D. & Roberts, D., 14 Meh 2017, Yn: British Journal of School Nursing . 12, 5, t. 234 243 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  22. Cyhoeddwyd

    The behavioural and cognitive sequelae of traumatic brain injuries

    Hugo, F. J. & Coetzer, B., 1997, Yn: Specialist Medicine.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygl

  23. Cyhoeddwyd

    First experimental demonstration of real-time adaptive transmission of 20Gb/s dual-band optical OFDM signals over 500m OM2 MMFs

    Hugues-Salas, E., Giddings, R. P. & Tang, J. M., 2013, Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC), 2013. t. 1-3 3 t.

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

  24. Cyhoeddwyd

    Record-high and robust capacity versus reach performance of adaptive real-time dual-band optical OFDM signals for upgrading legacy MMF systems

    Hugues-Salas, E., Zhang, Q. W., Giddings, R. P., Wang, M. & Tang, J. M., 2013, Future Network and Mobile Summit (FutureNetworkSummit), 2013. t. 1-10 10 t.

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

  25. Cyhoeddwyd

    REAM intensity modulator-enabled colorless transmission of real-time optical OFDM signals for WDM-PONs

    Hugues-Salas, E., Giddings, R. P., Jin, X. Q., Quinlan, T., Hong, Y., Walker, S. & Tang, J. M., 2012, t. 1-3. 3 t.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapuradolygiad gan gymheiriaid

  26. Cyhoeddwyd

    Real-time 11.25Gb/s optical OFDM transmission over 2000m legacy MMFs utilizing directly modulated VCSELs

    Hugues-Salas, E., Courjault, N., Jin, X. Q., Giddings, R. P., Aupetit-Berthelemot, C. & Tang, J. M., 2012, t. 1-3. 3 t.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapuradolygiad gan gymheiriaid

  27. Cyhoeddwyd

    Adaptability-enabled record-high and robust capacity-versus-reach performance of real-time dual-band optical OFDM signals over various OM1/OM2 MMF systems invited]

    Hugues-Salas, E., Zhang, Q., Giddings, R. P., Wang, M. & Tang, J., 2013, Yn: IEEE Journal of Optical Communications and Networking. 5, 10, A1-A11.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  28. Cyhoeddwyd

    Real-time experimental demonstration of low-cost VCSEL intensity-modulated 11.25Gb/s optical OFDM signal transmission over 25km PON systems

    Hugues-Salas, E., Giddings, R. P., Jin, X. Q., Wei, J. L., Zheng, X., Hong, Y., Shu, C. & Tang, J., 1 Chwef 2011, Yn: Optics Express. 19, 4, t. 2979-2988

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  29. Cyhoeddwyd

    First experimental demonstration of VCSEL-based realtime end-to-end 11.25Gb/s optical OFDM signal transmission over 800m MMFs

    Hugues-Salas, E., Jin, X. Q., Giddings, R. P., Wei, J. L., Shu, C. & Tang, J. M., 2011, t. 1-3. 3 t.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapuradolygiad gan gymheiriaid

  30. Cyhoeddwyd

    Optimal control of chaos in nonlinear driven oscillators via linear time-varying approximations.

    Hugues-Salas, E., Hugues-Salas, O. & Banks, S. P., 1 Tach 2008, Yn: International Journal of Bifurcation and Chaos. 18, 11, t. 3355-3374

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  31. Cyhoeddwyd

    First experimental demonstration of low-cost VCSEL-intensity modulated end-to-end real-time optical OFDM signal transmission at 11.25Gb/s over 25km SSMFs

    Hugues-Salas, E., Giddings, R. P., Hong, Y., Jin, X. Q., Wei, J. L., Zheng, X. & Tang, J. M., 2011, t. 1-3. 3 t.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapuradolygiad gan gymheiriaid

  32. Cyhoeddwyd

    REAM intensity modulator-enabled 10Gb/s colorless upstream transmission of real-time optical OFDM signals in a single-fiber-based bidirectional PON architecture

    Hugues-Salas, E., Giddings, R. P., Jin, X. Q., Hong, Y., Quinlan, T., Walker, S. & Tang, J. M., 2012, Yn: Optics Express. 20, 19, t. 21089-21100 12 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  33. Cyhoeddwyd

    Real-time 11.25Gb/s optical OFDM signal transmission over 2000m legacy MMFs using centre launching

    Hugues-Salas, E., Jin, X. Q., Giddings, R. P., Hong, Y., Mansoor, S., Villafranca, A. & Tang, J. M., 2012, t. 1-8. 8 t.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapuradolygiad gan gymheiriaid

  34. Cyhoeddwyd

    Synchronisation of a Class of Nonlinear Time-Delay Systems Applied to Two Unidirectionally Coupled External Cavity Laser Diodes

    Hugues-Salas, E., Hugues-Salas, O., Shore, K. A., Banks, S. P. & Diaz-Romero, D. A., 15 Hyd 2008, Yn: Research in Computing Science Special Issue: Advances in Automatic Control and Engineering. 36, t. 349-358

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  35. Cyhoeddwyd

    An extended Kalman filtering approach to nonlinear time-delay systems: application to chaotic secure communications.

    Hugues-Salas, O. & Shore, K. A., 1 Medi 2010, Yn: IEEE Transactions on Circuits and Systems I: Regular Papers. 57, 9, t. 2520-2530

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  36. Cyhoeddwyd
  37. Cyhoeddwyd

    Stabilisation of chaotic dynamics in semiconductor lasers with optical feedback using optimal control.

    Hugues-Salas, O., Shore, K. A. & Banks, S. P., 1 Rhag 2008, Yn: IET Optoelectronics. 2, 6, t. 231-240

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  38. Cyhoeddwyd

    Frequency drift in MR spectroscopy at 3T

    Hui, S. C. N., Mikkelsen, M., Zöllner, H. J., Ahluwalia, V., Alcauter, S., Baltusis, L., Barany, D. A., Barlow, L. R., Becker, R., Berman, J. I., Berrington, A., Bhattacharyya, P. K., Blicher, J. U., Bogner, W., Brown, M. S., Calhoun, V. D., Castillo, R., Cecil, K. M., Choi, Y. B., Chu, W. C. W., Clarke, W. T., Craven, A. R., Cuypers, K., Dacko, M., de la Fuente-Sandoval, C., Desmond, P., Domagalik, A., Dumont, J., Duncan, N. W., Dydak, U., Dyke, K., Edmondson, D. A., Ende, G., Ersland, L., Evans, C. J., Fermin, A. S. R., Ferretti, A., Fillmer, A., Gong, T., Greenhouse, I., Grist, J. T., Gu, M., Harris, A. D., Hat, K., Heba, S., Heckova, E., Hegarty, J. P., Heise, K-F., Jacobson, A., Jansen, J. F. A., Jenkins, C. W., Johnston, S. J., Juchem, C., Kangarlu, A., Kerr, A. B., Landheer, K., Lange, T., Lee, P., Levendovszky, S. R., Limperopoulos, C., Liu, F., Lloyd, W., Lythgoe, D. J., Machizawa, M. G., MacMillan, E. L., Maddock, R. J., Manzhurtsev, A. V., Martinez-Gudino, M. L., Miller, J. J., Mirzakhanian, H., Moreno-Ortega, M., Mullins, P. G., Near, J., Noeske, R., Nordhøy, W., Oeltzschner, G., Osorio-Duran, R., Otaduy, M. C. G., Pasaye, E. H., Peeters, R., Peltier, S. J., Pilatus, U., Polomac, N., Porges, E. C., Pradhan, S., Prisciandaro, J. J., Puts, N. A., Rae, C. D., Reyes-Madrigal, F., Roberts, T. P. L., Robertson, C. E., Rosenberg, J. T., Rotaru, D-G., O'Gorman Tuura, R. L., Saleh, M. G., Sandberg, K., Sangill, R., Schembri, K., Schrantee, A., Semenova, N. A., Singel, D., Sitnikov, R., Smith, J., Song, Y., Stark, C., Stoffers, D., Swinnen, S. P., Tain, R., Tanase, C., Tapper, S., Tegenthoff, M., Thiel, T., Thioux, M., Truong, P., van Dijk, P., Vella, N., Vidyasagar, R., Vovk, A., Wang, G., Westlye, L. T., Wilbur, T. K., Willoughby, W. R., Wilson, M., Wittsack, H-J., Woods, A. J., Wu, Y-C., Xu, J., Lopez, M. Y., Yeung, D. K. W., Zhao, Q., Zhou, X., Zupan, G., Edden, R. A. E., Nakajima, S. L. & Honda, S., 1 Tach 2021, Yn: Neuroimage. 241, 118430.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  39. Cyhoeddwyd

    Post-larval French grunts (Haemulon flavolineatum) distinguish between seagrass, mangrove and coral reef water: implications for recognition of potential nursery habitats.

    Huijbers, C., Mollee, E. & Nagelkerken, I., 31 Maw 2008, Yn: Journal of Experimental Marine Biology and Ecology. 357, 2, t. 134 5 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  40. Cyhoeddwyd

    Teacher Competence in Mindfulness-Based Cognitive Therapy for Depression and Its Relation to Treatment Outcome

    Huijbers, M. J., Crane, R., Kuyken, W., Heijke, L., Van den Hout, I., Donders, R. & Speckens, A., Awst 2017, Yn: Mindfulness. 8, 4, t. 960-972

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  41. Cyhoeddwyd

    Performance of microalgae for power-plant CO2 mitigation.

    Hulatt, C. & Thomas, D. N., 1 Ion 2010.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  42. Cyhoeddwyd

    Energy efficiency of an outdoor microalgal photobioreactor sited at mid-temperate latitude.

    Hulatt, C. J. & Thomas, D. N., 1 Meh 2011, Yn: Bioresource Technology. 102, 12, t. 6687-6695

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  43. Cyhoeddwyd

    Bioavailability and radiocarbon age of fluvial dissolved organic matter (DOM) from a northern peatland-dominated catchment: effect of land-use change

    Hulatt, C. J., Kaartokallio, H., Asmala, E., Autio, R., Stedmon, C. A., Sonninen, E., Oinonen, M. & Thomas, D. N., 1 Gorff 2014, Yn: Aquatic Sciences. 76, 3, t. 393-404

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  44. Cyhoeddwyd

    Dissolved organic matter (DOM) in microalgal photobioreactors: a potential loss in solar energy conversion?

    Hulatt, C. J. & Thomas, D. N., 10 Gorff 2010, Yn: Bioresource Technology. 101, 22, t. 8690-8697

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  45. Cyhoeddwyd

    Radiocarbon Dating of Fluvial Organic Matter Reveals Land-Use Impacts in Boreal Peatlands

    Hulatt, C. J., Kaartokallio, H., Oinonen, M., Sonninen, E., Stedmon, C. A. & Thomas, D. N., 4 Tach 2014, Yn: Environmental Science and Technology. 48, 21, t. 12543–12551

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  46. Cyhoeddwyd

    Productivity, carbon dioxide uptake and net energy return of microalgal bubble column photobioreactors.

    Hulatt, C. J. & Thomas, D. N., 1 Mai 2011, Yn: Bioresource Technology. 102, 10, t. 5775-5787

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  47. Cyhoeddwyd

    Energy demands of nitrogen supply in mass cultivation of two commercially important microalgal species, Chlorella vulgaris and Dunaliella tertiolecta

    Hulatt, C. J., Lakaniemi, A-M., Puhakka, J. A. & Thomas, D., 2 Chwef 2012, Yn: BioEnergy Research. 5, 3, t. 669-684

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Exudation and decomposition of chromophoric dissolved organic matter (CDOM) from some temperate macroalgae.

    Hulatt, C., Thomas, D. N., Bowers, D., Norman, L. & Zhang, C., 20 Awst 2009, Yn: Estuarine, Coastal and Shelf Science. 84, 1, t. 147-153

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  49. Cyhoeddwyd

    The cancer care experiences of gay, lesbian and bisexual patients: A secondary analysis of data from the UK Cancer Patient Experience Survey.

    Hulbert-Williams, N., Plumpton, C., Flowers, P., McHugh, R., Neal, R., Semlyen, J. & Storey, L., Gorff 2017, Yn: European Journal of Cancer Care. 26, 4, e12670.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  50. A review on effects of the atmospheric turbulence on laser beam propagation — An analytic approach

    Hulea, M., Tang, X., Ghassemlooy, Z. & Rajbhandari, S., 22 Medi 2016, 10th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP). United States: IEEE

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