Coleg Gwyddoniaeth a Pheirianneg
- Erthygl › Ymchwil › Adolygwyd gan gymheiriaid
- Cyhoeddwyd
High performance perovskite solar cells using Cu9S5 supraparticles incorporated hole transport layers
Zhou, X., Li, Z., Deng, X., Yan, B., Wang, J., Chen, X. & Huang, S., 14 Awst 2019, Yn: Nanotechnology. 30, 44, 12 t., 445401 .Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High performing AgNW transparent conducting electrodes with a sheet resistance of 2.5 Ω Sq−1 based upon a roll-to-roll compatible post-processing technique
Kumar, D., Stoichkov, V., Brousseau, E., Smith, G. C. & Kettle, J., 28 Maw 2019, Yn: Nanoscale. 11, 12, t. 5760-5769 10 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High representation of archaea across all depths in oxic and low-pH sediment layers underlying an acidic stream
Distaso, M., Bargiela, R., Brailsford, F., Williams, G., Wright, S., Lunev, E. A., Toshchakov, S. V., Yakimov, M. M., Jones, D. L., Golyshin, P. & Golyshina, O., 17 Tach 2020, Yn: Frontiers in Microbiology. 11, t. 576520Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High resolution HPLC-MS confirms overestimation of urea in soil by the diacetyl monoxime (DAM) colorimetric method
Reay, M. K., Yates, C. A., Johnes, P. J., Arthur, C. J., Jones, D. L. & Evershed, R. P., Awst 2019, Yn: Soil Biology and Biochemistry. 135, t. 127-133Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High resolution evidence for linkages between European Ice Sheet instability and Atlantic Meridional Overturning Circulation.
Peck, V. L., Hall, I. R., Zahn, R., Elderfield, H., Grousset, F., Hemming, S. R. & Scourse, J. D., 1 Ion 2006, Yn: Earth and Planetary Science Letters. 243, 3-4, t. 476-488Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High resolution last deglaciation record from the Congo Fan reveals significance of mangrove pollen and biomarkers as indicators of shelf transgression.
Scourse, J. D., Marret, F., Versteegh, G. J., Jansen, J. H., Schefuss, E. & Van Der Plicht, J., 1 Ion 2005, Yn: Quaternary Research. 64, (1), t. 57-69Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High resolution synchrotron imaging of wheat root hairs growing in soil and image based modelling of phosphate uptake
Keyes, S. D., Daly, K. R., Gostling, N. J., Jones, D. L., Talkboys, P., Pinzer, B. R., Boardman, R., Sinclair, I., Marchant, A. & Roose, T., 1 Meh 2013, Yn: New Phytologist. 198, 4, t. 1023-1029Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High temperature, low neutron cross-section highentropy alloys in the Nb-Ti-V-Zr system
King, D. J. M., Cheung, S. T. Y., Humphry-Baker, S. A., Parkin, C., Couet, A., Cortie, M. B., Lumpkin, G. R., Middleburgh, S. & Knowles, A. J., Maw 2019, Yn: Acta Materialia. 166, t. 435-446Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High throughput shotgun sequencing of eRNA reveals taxonomic and derived functional shifts across a benthic productivity gradient
Broman, E., Bonaglia, S., Norkko, A., Creer, S. & Nascimento, F. J. A., Gorff 2021, Yn: Molecular Ecology. 30, 13, t. 3023-3039 17 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-Entropy Alloys for Advanced Nuclear Applications
Pickering, E., Carruthers, A., Barron, P., Middleburgh, S., Armstrong, D. & Gandy, A., 11 Ion 2021, Yn: Entropy. 23, 1, 98.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-Q inverted silica microtoroid resonators monolithically integrated into a silicon photonics platform
Richter, J., Nezhad, M. P., Hadam, B., Taubner, T., Knoch, J., Merget, F., Moscoso-Mártir, A. & Witzens, J., 15 Hyd 2018, Yn: Optics Express. 26, 21, t. 27418-27440Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-Throughput Method for Rapid Induction of Prophages from Lysogens and Its Application in the Study of Shiga Toxin-Encoding Escherichia coli Strains
McDonald, J. E., Smith, D. L., Fogg, P. C., McCarthy, A. J. & Allison, H. E., 1 Ebr 2010, Yn: Applied and Environmental Microbiology. 76, 7, t. 2360-2365Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-precision branching ratio measurement and spin assignment implications for Ga-62 superallowed beta decay
MacLean, A. D., Laffoley, A. T., Svensson, C. E., Ball, G. C., Leslie, J. R., Andreoiu, C., Babu, A., Bhattacharjee, S. S., Bidaman, H., Bildstein, V., Burbadge, C., Bowry, M., Cheng, C., Cross, D. S., Diaz-Varela, A., Dillmann, I., Dunlop, M. R., Dunlop, R., Evitts, L. J., Finlay, P., Gillespie, S., Garnsworthy, A. B., Garrett, P. E., Gopaul, E., Grinyer, G. F., Hackman, G., Jigmeddorj, B., Leach, K. G., Kassanda, E., McAfee, J., Moukaddam, M., Natzke, C., Nittala, S., Olaizola, B., Park, J., Paxman, C., Pore, J. L., Porzio, C., Radich, A. J., Ruotsalainen, P., Saito, Y., Sharma, S., Smallcombe, J., Sultana, R., Turko, J., Yates, D. & Zidar, T., 19 Tach 2020, Yn: Physical Review C. 102, 5, 054325.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-resolution maps show that rubber causes substantial deforestation
Wang, Y., Hollingsworth, P. M., Zhai, D., West, C., Green, J. M. H., Chen, H., Hurni, K., Su, Y., Warren-Thomas, E., Xu, J. & Ahrends, A., 18 Hyd 2023, Yn: Nature. 623Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-resolution modelling of the shelf and open ocean adjacent to South Georgia, Southern Ocean
Young, E. F., Meredith, M. P., Murphy, E. J. & Carvalho, G. R., 16 Rhag 2010, Yn: Deep Sea Research II: Topical Studies in Oceanography.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-sensitivity optical chemsensor based on etched D-fibre Bragg gratings
Zhou, K., Chen, X., Zhang, L. & Bennion, I., 13 Ebr 2004, Yn: Electronics Letters. 40, 4, t. 232-234Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-speed secure stream cipher using synchronized chaos and the RC4 algorithm for optical communications
Xue, C., Zheng, L., Wang, X., Zhu, B., Zhang, Z. & Hong, Y., 13 Ion 2025, Yn: Optics Express. 33, 1Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-speed transmission of adaptively modulated optical OFDM signals over multimode fibers using directly modulated DFBs
Tang, J., Lane, P. M. & Shore, K. A., 1 Ion 2006, Yn: Journal of Lightwave Technology. 24, 1, t. 429-441Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-sugar perennial ryegrass as a feed-stock for bioconversion to platform chemicals
Winters, A. L., Leemans, D., S. M., M., Pippel, J., Lovatt, A., Charlton, A. & Gallagher, J., 2010, Yn: Aspects of Applied Biology. 101, t. 79-86Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-throughput DNA sequencing of museum specimens sheds light on the long-missing species of the Bokermannohyla claresignata group (Anura: Hylidae ...
Lyra, M., Pinheiro, P. D. P., Lourenco, A. C., Pezzuti, T. L., Baeta, D., Barlow, A., Hofreiter, M., Pombal, J. P., Haddad, C. F. B. & Faivovich, J., 17 Meh 2020, Yn: Zoological Journal of the Linnean Society. 190, 4Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- E-gyhoeddi cyn argraffu
High-throughput qPCR profiling of antimicrobial resistance genes and bacterial loads in wastewater and receiving environments
Silvester, R., Woodhall, N., Nurmi, W., Muziasari, W., Farkas, K., Cross, G., Malham, S. K. & Jones, D. L., 15 Mai 2025, Yn: Environmental Pollution. 373, t. 126096Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-voltage 10 ns delayed paired or bipolar pulses for in vitro bioelectric experiments
Orlacchio, R., Carr, L., Palego, C., Arnaud-Cormos, D. & Leveque, P., Chwef 2021, Yn: Bioelectrochemistry. 137, 107648.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
High-yield carbon derived from commercial phenol–formaldehyde resin for broadband microwave absorption by balancing conductivity and polarization loss
Shi, Y., Li, X., Liu, Q., Zhang, C., Guo, W., Tian, K., Elias, R. & Wang, H., Ebr 2023, Yn: Journal of Materials Science. 58, t. 7048-7059Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- E-gyhoeddi cyn argraffu
Higher potential leaching of inorganic and organic additives from biodegradable compared to conventional agricultural plastic mulch film
Reay, M. K., Graf, M., Murphy, M., Li, G., Yan, C., Bhattacharya, M., Osbahr, H., Ma, J., Chengtao, W., Shi, X., Ren, S., Cui, J., Collins, C., Chadwick, D., Jones, D. L., Evershed, R. P. & Lloyd, C., 7 Ion 2025, (E-gyhoeddi cyn argraffu) Yn: Journal of Hazardous Materials. 137147.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Higher-dimensional hypergroups
Wensley, C. D., Brown, R., Morris, I., Shrimpton, J. & Al-Ali, M. I., 1997, Yn: Far East Journal of Mathematical Sciences. 5, 2, t. 329-335Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Highly Sensitive Bend Sensor Based on Bragg Grating in Eccentric Core Polymer Fiber
Chen, X., Zhang, C., Webb, D. J., Kalli, K. & Peng, G. D., 1 Meh 2010, Yn: IEEE Photonics Technology Letters. 22, 11, t. 850-852Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Highly branched isoprenoids as proxies for variable sea ice conditions in the Southern Ocean
Masse, G., Belt, S. T., Crosta, X., Schmidt, S., Snape, I., Thomas, D. N. & Rowland, S. J., Hyd 2011, Yn: Antarctic Science. 23, 5, t. 487-498Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Highly client-oriented breeding, using local preferences and selection, produces widely adapted rice varieties.
Joshi, K. D., Musa, A. M., Johansen, C., Gyawali, S., Harris, D. & Witcombe, J. R., 4 Ion 2007, Yn: Field Crops Research. 100, 1, t. 107-116Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Highly contiguous assemblies of 101 drosophilid genomes
Kim, B. Y., Wang, J., Miller, D. E., Barmina, O., Delaney, E. K., Thompson, A., Comeault, A., Peede, D., D'Agostino, E. R., Pelaez, J., Aguilar, J. M., Haji, D., Matsunaga, T., Armstrong, E., Zych, M., Ogawa, Y., Stamenković-Radak, M., Jelić, M., Savić Veselinović, M., Tanasković, M., Erić, P., Gao, J.-J., Katoh, T. K., Toda, M. J., Watabe, H., Watada, M., Davis, J. S., Moyle, L., Manoli, G., Bertolini, E., Koštál, V., Hawley, R. S., Takahashi, A., Jones, C. D., Price, D. K., Whiteman, N. K., Kopp, A., Matute, D. R. & Petrov, D. A., 19 Gorff 2021, Yn: Elife. 10, e66405.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Highly discriminative and adaptive feature extraction method based on NMF-MFCC for event recognition of Φ-OTDR
Huang, Y., Dai, J., Shen, W., Chen, X., Hu, C., Deng, C., Chen, L., Zhang, X., Jin, W., Tang, J. & Wang, T., 10 Rhag 2023, Yn: Applied Optics. 62, 35, t. 9326-9333 8 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Highly stereoselective conjugate additions of heteroaryl alkyl sulfoxides
Casey, M., Gairns, R. S., Geraghty, G. M., Kelly, C. J., Murphy, P. J. & Walker, A. J., 2000, Yn: Synlett. 2000, 12, t. 1721-1724 4 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Himantura randalli sp. nov., a new whipray (Myliobatoidea: Dasyatidae) from the Persian Gulf
Last, P., Manjaji-Matsumoto, B. M. & Moore, A., 2012, Yn: Zootaxa. 3327, t. 20-32Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Historic Spatial Patterns of Storm-Driven Compound Events in UK Estuaries
Lyddon, C., Robins, P., Lewis, M., Barkwith, A., Vasilopoulos, G., Haigh, I. & Coulthard, T., Ion 2023, Yn: Estuaries and Coasts. 46, 1, t. 30-56 27 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Historical biogeography of the western rattlesnake (Serpentes : Viperidae : Crotalus viridis), inferred from mitochondrial DNA sequence information
Pook, C. E., Wuster, W. & Thorpe, R. S., 1 Mai 2000, Yn: Molecular Phylogenetics and Evolution. 15, 2, t. 269-282Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Historical comparisons reveal multiple drivers of decadal change of an ecosystem engineer at the range edge
Firth, L., Mieszkowska, N., Grant, L. M., Bush, L., Davies, A., Frost, M. T., Moschella, P. S., Burrows, M. T., Cunningham, P. N., Dye, S. R. & Hawkins, S., Awst 2015, Yn: Ecology and Evolution. 5, 15, t. 3210-3222Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Historical dataset details the distribution, extent and form of lost Ostrea edulis reef ecosystems
Thurstan, R. H., McCormick, H., Preston, J., Ashton, E. C., Bennema, F. P., Bratoš Cetinić, A., Brown, J. H., Cameron, T. C., da Costa, F., Donnan, D. W., Ewers, C., Fortibuoni, T., Galimany, E., Giovanardi, O., Grancher, R., Grech, D., Hayden-Hughes, M., Helmer, L., Jensen, K. T., Juanes, J. A., Latchford, J., Moore, A. B. M., Moutopoulos, D. K., Nielsen, P., von Nordheim, H., Ondiviela, B., Peter, C., Pogoda, B., Poulsen, B., Pouvreau, S., Scherer, C., Smaal, A. C., Smyth, D., Strand, Å., Theodorou, J. A. & zu Ermgassen, P. S. E., 5 Tach 2024, Yn: Scientific data. 11, 1Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Historical records, archives and photogrammetry
Wilson, A., Wilson, H., Labrosse, F., Tiddeman, B. & Roberts, J. C., 23 Chwef 2016, Yn: Historic Environment: Policy & Practice. 7, 1, t. 25-42Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
History of predator exposure affects cell-mediated immunity in female eastern fence lizards, Sceloporus undulatus (Squamata: Phrynosomatidae)
Sprayberry, K., Tylan, C., Owen, D. A. S., Macleod, K. J., Sheriff, M. J. & Langkilde, T., 1 Rhag 2019, Yn: BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY. 128, 4, t. 944-951Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Holocene evolution of seasonal stratification in the Celtic Sea: refined age model, mixing depths and foraminiferal stratigraphy.
Scourse, J. D., Austin, W. E., Long, B. T., Assinder, D. J. & Huws, D., 30 Tach 2002, Yn: Marine Geology. 191, 3-4, t. 119-145Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Holocene shelf sea evolution offshore northeast England
Evans, J. R., Austin, W. E., Brew, D. S., Wilkinson, I. P. & Kennedy, H. A., 30 Tach 2002, Yn: Marine Geology. 191, 3-4, t. 147-164Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Holocene shelf-sea seasonal stratification dynamics: a dinoflagellate cyst record from the Celtic Sea, NW European shelf.
Marret, F., Scourse, J. D. & Austin, W., 1 Medi 2004, Yn: Holocene. 14, 5, t. 689-696Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Home range and movements of the quokka Setonix brachyurus (Macropodidae: Marsupialia), and its impact on the viability of the metapopulation on the Australian mainland
Hayward, M., De Tores, P. J., Augee, M. L., Fox, B. & Banks, P. B., Gorff 2004, Yn: Journal of Zoology. 263, 3, t. 219-228Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Homo- and heterometallic planes, chains and cubanes
Meally, S. T., Taylor, S. M., Brechin, E. K., Piligkos, S. & Jones, L. F., 2013, Yn: Dalton Transactions. 42, 28, t. 10315-10325Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Homologous chromosome pairing in Schizosaccharomyces pombe
Mcfarlane, R. J., Wells, J. L., Pryce, D. W. & McFarlane, R. J., 15 Hyd 2006, Yn: Yeast. 23, 13, t. 977-989Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Honeybee (Apis mellifera L.) defoliation on Alnus species in Uganda: a blessing or curse in agroforestry?
Nyeko, P., Edwards-Jones, G. & Day, R. K., 1 Hyd 2002, Yn: Bulletin of Entomological Research. 92, 5, t. 405-412Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Horizontal viewsheds of large herbivores as a function of woodland structure
Gresham, A., Healey, J., Eichhorn, M., Barton, O., Smith, A. & Shannon, G., 9 Tach 2023, Yn: Ecology and Evolution. 13, 11Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Host Plant Effects on Sexual Selection Dynamics in Phytophagous Insects
Jarrett, B. & Miller, C., 1 Ion 2024, Yn: Annual Review of Entomology. 69, t. 41-57Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Host density and anthropogenic stress are drivers of variability in dark spot disease in Siderastrea siderea across the Florida Reef Tract
Aeby, G. S., Williams, G. J., Whitall, D., Davies, A., Fromuth, E. & Walker, B. K., 1 Ebr 2024, Yn: Bulletin of Marine Science . 100, 2, t. 163-184 22 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- 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
- Cyhoeddwyd
Host-plant specialisation and habitat restriction in an endangered insect, Lycaena dispar batavus (Lepidoptera : Lycaenidae) I. Larval feeding and oviposition preferences.
Martin, L. A. & Pullin, A. S., 1 Ion 2004, Yn: European Journal of Entomology. 101, 1, t. 51-56Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid