1. Cyhoeddwyd

   Effective-mode representation of non-Markovian dynamics: A hierarchical approximation of the spectral density. I. Application to single surface dynamics.

   Hughes, K. H., Christ, C. D. & Burghardt, I., 14 Gorff 2009, Yn: Journal of Chemical Physics. 131, 2, t. 024109

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

2. Cyhoeddwyd

   Quantum hydrodynamics for mixed states.

   Hughes, K. H., Parry, S. M., Burghardt, I., Shalashilin, D. V. (gol.) & De Miranda, M. P. (gol.), 1 Ion 2009, Multidimensional Quantum Mechanics with Trajectories. 2009 gol. CCP, Daresbury, t. 74-76

   Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

3. Cyhoeddwyd

   Boltzmann wavepacket dynamics of tunnelling of molecules through symmetric and asymmetric energy barriers on non-periodic potential functions.

   Hughes, K. H. & Macdonald, J. N., 1 Awst 2000, Yn: Physical Chemistry Chemical Physics. 2, 16, t. 3539-3547

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

4. Cyhoeddwyd

   Wavepacket dynamics on arbitrary Lagrangian-Eulerian grids: application to an Eckart barrier

   Hughes, K. H. & Wyatt, R. E., 1 Ion 2003, Yn: Physical Chemistry Chemical Physics. 5, 18, t. 3905-3910

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

5. Cyhoeddwyd

   A hybrid hydrodynamic lliouvillian approach to non-Markovian dynamics.

   Hughes, K. H., Burghardt, I. & Chattaraj, P. (gol.), 1 Ion 2010, Quantum Trajectories. 2010 gol. Taylor and Francis

   Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

6. Cyhoeddwyd

   Dynamics of Open Quantum Systems

   Hughes, K. H. (gol.), 1 Ion 2006, 2006 gol. CCP, Daresbury.

   Allbwn ymchwil: Llyfr/Adroddiad › Llyfr

7. Cyhoeddwyd

   A hybrid hydrodynamic-liouvillian approach to mixed quantum-classical dynamics: application to tunneling in a double well

   Hughes, K. H., Parry, S. M., Parlant, G. & Burghardt, I., 1 Awst 2007, Yn: Journal of Physical Chemistry A. 111, 41, t. 10269-10283

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

8. Cyhoeddwyd

   Maximum-entropy closure of hydrodynamic moment hierarchies including correlations

   Hughes, K. H. & Burghardt, I., 7 Meh 2012, Yn: Journal of Chemical Physics. 136, 21, Article 214109.

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

9. Cyhoeddwyd

   Non-Markovian reduced dynamics of ultrafast charge transfer at an oligothiophene–fullerene heterojunction

   Hughes, K. H., Cahier, B., Martinazzo, R., Tamura, H. & Burghardt, I., 9 Gorff 2014, Yn: Chemical Physics. 442, t. 111-118

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10. Cyhoeddwyd

    Optical control of dissipative quantum phase space dynamics.

    Hughes, K. H., Hywel. M.*, N. V., Lasorne, B. (gol.) & Worth, G. A. (gol.), 1 Ion 2006, Coherent Control of Molecules. 2006 gol. CCP, Daresbury, t. 28-33

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

11. Cyhoeddwyd

    Trajectory approach to dissipative quantum phase space dynamics: application to barrier scattering

    Hughes, K. H. & Wyatt, R. E., 1 Maw 2004, Yn: Journal of Chemical Physics. 120, 9, t. 4089-4097

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

12. Cyhoeddwyd

    Rapid, Semi-Automated Fractionation of Freshwater Dissolved Organic Carbon Using DAX 8 (XAD 8) and XAD 4 Resins in Tandem

    Hughes, D., Holliman, P., Jones, T., Jones, T., Butler, A. J. & Freeman, C., 22 Tach 2016, Yn: Natural Science. 8, 11, t. 487-498

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

13. Cyhoeddwyd

    Temporal variations in dissolved organic carbon concentrations in upland and lowland lakes in North Wales

    Hughes, D. D., Holliman, P. J., Jones, T. & Freeman, C., 1 Meh 2013, Yn: Water and Environment Journal. 27, 2, t. 275-283

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

14. Cyhoeddwyd

    Assessment of potential climate change impacts on peatland dissolved organic carbon release and drinking water treatment from laboratory experiments

    Hughes, D. D., Tang, R., Clark, J. M., Bond, T., Graham, N., Hughes, D. & Freeman, C., 1 Chwef 2013, Yn: Environmental Pollution. 173, t. 270-277

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

15. Cyhoeddwyd

    Biodegradable and Biocompatible PDLLA-PEG1k-PDLLA Diacrylate Macromers: Synthesis, Characterisation and Preparation of Soluble Hyperbranched Polymers and Crosslinked Hydrogels

    Hughes, A., Tai, H., Tochwin, A. & Wang, W., 20 Ebr 2017, Yn: Processes. 5, 2, 18.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

16. Cyhoeddwyd

    Origin and fate of Vanadium in the Hazeltine Creek Catchment following the 2014 Mount Polley mine tailings spill, British Columbia, Canada

    Hudson-Edwards, K. A., Byrne, P., Bird, G., Brewer, P. A., Burke, I. T., Jamieson, H. E., Macklin, M. G. & Williams, R. D., 16 Ebr 2019, Yn: Environmental Science and Technology. 53, 8, t. 4088–4098

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

17. Cyhoeddwyd

    Detection and Identification of Species-Specific Bacteria Associated with Synanthropic Mites

    Hubert, J., Kopecký, J., Perotti, M. A., Nesvorná, M., Braig, H. R., Ságová-Marečková, M., Macovei, M. & Zurek, L., 1 Mai 2012, Yn: Microbial Ecology. 63, 4, t. 919-928

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

18. Cyhoeddwyd

    Challenges and opportunities for early-career Teaching-Focussed academics in the biosciences

    Hubbard, K., Gretton, S., Jones, K. & Tallents, L., Maw 2015, Yn: F1000Research. 4

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

19. Cyhoeddwyd

    Asynchronous carbon sink saturation in African and Amazonian tropical forests

    Hubau, W., Lewis, S. L., Phillips, O. L., Affum-Baffoe, K., Beeckman, H., Cuní-Sanchez, A., Daniels, A. K., Ewango, C. E. N., Fauset, S., Mukinzi, J. M., Sheil, D., Sonké, B., Sullivan, M. J. P., Sunderland, T. C. H., Taedoumg, H., Thomas, S. C., White, L. J. T., Abernethy, K. A., Adu-Bredu, S., Amani, C. A., Baker, T. R., Banin, L. F., Baya, F., Begne, S. K., Bennett, A. C., Benedet, F., Bitariho, R., Bocko, Y. E., Boeckx, P., Boundja, P., Brienen, R. J. W., Brncic, T., Chezeaux, E., Chuyong, G. B., Clark, C. J., Collins, M., Comiskey, J. A., Coomes, D. A., Dargie, G. C., de Haulleville, T., Kamdem, M. N. D., Doucet, J-L., Esquivel-Muelbert, A., Feldpausch, T. R., Fofanah, A., Foli, E. G., Gilpin, M., Gloor, E., Gonmadje, C., Gourlet-Fleury, S., Hall, J. S., Hamilton, A. C., Harris, D. J., Hart, T. B., Hockemba, M. B. N., Hladik, A., Ifo, S. A., Jeffery, K. J., Jucker, T., Yakusu, E. K., Kearsley, E., Kenfack, D., Koch, A., Leal, M. E., Levesley, A., Lindsell, J. A., Lisingo, J., Lopez-Gonzalez, G., Lovett, J. C., Makana, J-R., Malhi, Y., Marshall, A. R., Martin, J., Martin, E. H., Mbayu, F. M., Medjibe, V. P., Mihindou, V., Mitchard, E. T. A., Moore, S., Munishi, P. K. T., Bengone, N. N., Ojo, L., Ondo, F. E., Peh, K. S-H., Pickavance, G. C., Poulsen, A. D., Poulsen, J. R., Qie, L., Reitsma, J., Rovero, F., Swaine, M. D., Talbot, J., Taplin, J., Taylor, D. M., Thomas, D. W., Toirambe, B., Mukendi, J. T., Tuagben, D., Umunay, P. M., van der Heijden, G. M. F., Verbeeck, H., Vleminckx, J., Willcock, S., Wöll, H., Woods, J. T. & Zemagho, L., 5 Maw 2020, Yn: Nature. 579, 7797, t. 80-87 8 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

20. Cyhoeddwyd

    Environmental assessment of small-scale vegetable farming systems in peri-urban areas of the Yangtze River delta region, China.

    Huang, B., Shi, X., Yu, D., Oborn, I., Blomback, K., Pagella, T. F., Wang, H., Sun, W. & Sinclair, F. L., 1 Maw 2006, Yn: Agriculture, Ecosystems and Environment. 112, 4, t. 391-402

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

21. Cyhoeddwyd

    Members of the crustacean hyperglycemic hormone (CHH) peptide family are differentially distributed both between and within the neuroendocrine organs of Cancer crabs: implications for differential release and pleiotropic function.

    Hsu, Y. W., Messinger, D. I., Chung, J. S., Webster, S. G., De La Iglesia, H. O. & Christie, A. E., 15 Awst 2006, Yn: Journal of Experimental Biology. 209, 16, t. 3241-3256

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

22. Cyhoeddwyd

    Time to stop monkeying around? Climate change impacts on the biogeography of Callitrichidae species

    Howe, B. & Winder, I. C., Ebr 2020.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Crynodeb › adolygiad gan gymheiriaid

23. Cyhoeddwyd

    Fabrication of biodegradable scaffolds via supercritical carbon dioxide foaming: Effect of polymer composition and processing conditions

    Howdle, S. M., Shakesheff, K. M. & Tai, H., 19 Awst 2007, Yn: Abstracts of papers - American Chemical Society. 234

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

24. Cyhoeddwyd

    Synthesis of a novel C2-symmetric guanidine base

    Howard-Jones, A., Murphy, P. J. & Thomas, D. A., 15 Ion 1999, Yn: Journal of Organic Chemistry. 64, 3, t. 1039-1041 3 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

25. Cyhoeddwyd

    Solvothermal Synthesis of Discrete Cages and Extended Networks Comprising {Cr(III)3O(O2CR)3(oxime)3}2- (R = H, CH3, C(CH3)3, C14H9) Building Blocks.

    Houton, E., Comar, P., Pitak, M. B., Coles, S. J., Ryder, A. G., Piligkos, S., Brechin, E. K. & Jones, L., 28 Gorff 2016, Yn: RSC Advances. 77, t. 73668-73676

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

26. Cyhoeddwyd

    Ferromagnetic exchange in a twisted, oxime-bridged [Mn-2(III)] dimer

    Houton, E., Taylor, S. M., Beedle, C. C., Cano, J., Piligkos, S., Hill, S., Ryder, A. G., Brechin, E. K. & Jones, L. F., 2012, Yn: Dalton Transactions. 41, 27, t. 8340-8347

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

27. Cyhoeddwyd

    Bulking up: Hexanuclear oximato Fe(III) complexes surrounded by sterically demanding co-ligands

    Houton, E., Meally, S. T., Sanz, S., Brechin, E. K. & Jones, L. F., 1 Medi 2014, Yn: Inorganica Chimica Acta. 421, t. 416-422

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

28. Cyhoeddwyd

    A Soluble Fucose-Specific Lectin from Aspergillus fumigatus Conidia - Structure, Specificity and Possible Role in Fungal Pathogenicity

    Houser, J., Komarek, J., Kostlanova, N., Cioci, G., Varrot, A., Kerr, S. C., Lahmann, M., Balloy, V., Fahy, J. F., Chignard, M., Imberty, A. & Wimmerova, M., 10 Rhag 2013, Yn: PLoS ONE.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

29. Cyhoeddwyd

    Changes in antioxidant compounds in white cabbage during winter storage.

    Hounsome, N., Hounsome, B., Tomos, A. D. & Edwards-Jones, G., 1 Mai 2009, Yn: Postharvest Biology and Technology. 52, 2, t. 173-179

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

30. Cyhoeddwyd

    Psychological Morbidity of Farmers and Non-farming Population: Results from a UK Survey

    Hounsome, B., Edwards, R. T., Hounsome, N. & Edwards-Jones, G., 1 Awst 2012, Yn: Community Mental Health Journal. 48, 4, t. 503-510

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

31. Cyhoeddwyd

    A note on the effect of farmer mental health on adoption: The case of agri-environment schemes.

    Hounsome, B., Edwards, R. T. & Edwards-Jones, G., 1 Rhag 2006, Yn: Agricultural Systems. 91, 3, t. 229-241

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

32. Cyhoeddwyd

    Greenhouse Gas Mitigation of Rural Household Biogas Systems in China: A Life Cycle Assessment

    Hou, J., Zhang, W., Wang, P., Dou, Z., Gao, L. & Styles, D., 2017, Yn: Energies. 10, 14 t., 239.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

33. Cyhoeddwyd

    The sustainability of rice‐crayfish coculture systems: a mini review of evidence from Jianghan plain in China

    Hou, J., Styles, D., Cao, Y. & Ye, X., 1 Gorff 2021, Yn: Journal of the Science of Food and Agriculture. 101, 9, t. 3843-3853 11 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

34. Cyhoeddwyd

    The role of seasonality in lettuce consumption: a case study of environmental and social aspects.

    Hospido, A., Mila I Canals, L., McLaren, S., Truninger, M., Edwards-Jones, G. & Clift, R., 1 Gorff 2009, Yn: International Journal of Life Cycle Assessment. 14, 5, t. 381-391

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

35. Cyhoeddwyd

    Phylogenomics and species delimitation for effective conservation of manta and devil rays

    Hosegood, J., Humble, E., Ogden, R., De Bruyn, M., Creer, S., Stevens, G. M. W., Abudaya, M., Bassos-Hull, K., Bonfil, R., Fernando, D., Foote, A., Hipperson, H., Jabado, R. W., Kaden, J., Moazzam, M., Peel, L. R., Pollett, S., Ponzo, A., Poortvliet, M., Salah, J., Senn, H., Stewart, J. D., Wintner, S. & Carvalho, G., Rhag 2020, Yn: Molecular Ecology. 29, 24, t. 4783-4796

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

36. Cyhoeddwyd

    Pentafluorophenylboronic acid.

    Horton, P. N., Hursthouse, M. B., Beckett, M. A. & Rugen-Hankey, M. P., 1 Rhag 2003, Yn: Acta Crystallographica Section E: Structure Reports Online. 60, 12, t. o2204-o2206

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

37. Cyhoeddwyd

    Addition of base cations increases microbial carbon use efficiency and biomass in acidic soils

    Horn, E. L., Cooledge, E., Jones, D. L., Hoyle, F. C., Brailsford, F. L. & Murphy, D. V., Hyd 2021, Yn: Soil Biology and Biochemistry. 161, 108392.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

38. Cyhoeddwyd

    More new carbon in the mineral soil of a poplar plantation under Free Air Carbon Enrichment (POPFACE): cause of increased priming effect?

    Hoosbeek, M. R., Lukac, M., Van Dam, D., Godbold, D. L., Velthorst, E. J., Biondi, F. A., Peressotti, A., Cotrufo, M. F., De Angelis, P. & Scarascia-Mugnozza, G., 16 Maw 2004, Yn: Global Biogeochemical Cycles. 18, 1, t. GB1040

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

39. Cyhoeddwyd

    Free atmospheric CO2 enrichment increased above ground biomass but did not affect symbiotic N-2-fixation and soil carbon dynamics in a mixed deciduous stand in Wales

    Hoosbeek, M. R., Lukac, M., Velthorst, E., Smith, A. R. & Godbold, D. L., 14 Chwef 2011, Yn: Biogeosciences. 8, 2, t. 353-364

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

40. Cyhoeddwyd

    Free atmospheric CO2 enrichment did not affect symbiotic N2-fixation and soil carbon dynamics in a mixed deciduous stand in Wales.

    Hoosbeck, M. R., Lukac, M., Velthorst, E. J. & Godbold, D. L., 4 Meh 2010, Yn: Biogeosciences Discussions. 7, 3, t. 4153-4180

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

41. Cyhoeddwyd

    Host-derived population genomics data provides insights into bacterial and diatom composition of the killer whale skin

    Hooper, R., Brealey, J., van der Valk, T., Alberdi, A., Durban, J., Fearnbach, H., Baird, R., Hanson, M. B., Wade, P., Gilbert, M. T. P., Morin, P. A., Wolf, J. B. W., Foote, A. & Guschanski, K., Ion 2019, Yn: Molecular Ecology. 28, 2, t. 484-502 19 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

42. Cyhoeddwyd

    Modelling the peroxisomal carbon leak during lipid mobilization in Arabidopsis.

    Hooks, M. A., Allen, E. & Watts, J. A., 1 Hyd 2010, Yn: Biochemical Society Transactions. 38, 5, t. 1230-1233

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

43. Cyhoeddwyd

    Acetate non-utilizing mutants of Arabidopsis: evidence that organic acids influence carbohydrate perception in germinating seedlings.

    Hooks, M. A., Turner, J. E., Murphy, E. C. & Graham, I. A., 1 Ebr 2004, Yn: Molecular Genetics and Genomics. 271, 3, t. 249-256

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

44. Cyhoeddwyd

    The Arabidopsis ALDP protein homologue COMATOSE is instrumental in peroxisomal acetate metabolism.

    Hooks, M. A., Turner, J. E., Murphy, E. C., Johnston, K. A., Burr, S. & Jaroslawski, S., 15 Medi 2007, Yn: Biochemical Journal. 406, 3, t. 399-406

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

45. Cyhoeddwyd

    Evidence that ACN1 (acetate non-utilizing 1) prevents carbon leakage from peroxisomes during lipid mobilization in Arabidopsis seedlings

    Hooks, M. A., Allen, E., Moing, A., Wattis, J., Larson, T., Maucourt, M., Graham, I. A. & Rolin, D. H., 11 Mai 2011, Yn: Biochemical Journal. 437, t. 505-513

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

46. Cyhoeddwyd

    Structural properties of the peroxisomal acetyl-CoA synthetase ACN1 from Arabidopsis.

    Hooks, M., Nicholl, S., Grossman, G., McCullough, B. & Murphy, L. M., 1 Gorff 2008, t. S188.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

47. Cyhoeddwyd

    Rates, distributions and mechanisms of change in meander morphology over decadal timescales, River Dane, UK

    Hooke, J. M. & Yorke, L., 1 Hyd 2010, Yn: Earth Surface Processes and Landforms. 35, 13, t. 1601-1614

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

48. Cyhoeddwyd

    Channel bar dynamics on multi-decadal timescales in an active meandering river

    Hooke, J. M. & Yorke, L., 1 Tach 2011, Yn: Earth Surface Processes and Landforms. 36, 14, t. 1910-1928

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

49. Cyhoeddwyd

    National scale mapping of supply and demand for recreational ecosystem services

    Hooftman, D., Ridding, L., Redhead, J. & Willcock, S., Hyd 2023, Yn: Ecological Indicators. 154, 20 t., 110779.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

50. Cyhoeddwyd

    Reducing Uncertainty in Ecosystem Service Modelling through Weighted Ensembles

    Hooftman, D., Bullock, J., Jones, L., Eigenbrod, F., Barredo, J., Forrest, M., Kinderman, G., Thomas, A. & Willcock, S., Chwef 2022, Yn: Ecosystem Services. 53, 22 t., 101398.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid