845 research outputs found
Gjellerupia neoguinensis Roewer 1913
No full textGjellerupia neoguinensis Roewer, 1913 Gjellerupia neoguinensis Roewer, 1913 b, p. 159–161; 1923, p. 108, fig. 108. Record. *Sermowai River, elevation 400 m, near Walckenaer Bay [West Papua, Indonesia] in forest, collected 3– 4 April, 1911 by K. Gjellerup.Published as part of Sharma, Prashant P., Kury, Adriano B. & Giribet, Gonzalo, 2011, Zalmoxidae (Arachnida: Opiliones: Laniatores) of the Paleotropics: a catalogue of Southeast Asian and Indo-Pacific species, pp. 37-58 in Zootaxa 2972 on pages 39-40, DOI: 10.5281/zenodo.20662
Twinning-induced pseudoelastic behavior in (MoW)85(TaTi)7.5Zr7.5
Full text linkWe provide a critical atomistic evidence of pseudoelastic behavior in complex solid-solution BCC Mo-W-Ta-Ti-Zr alloy. Prior to this work, only limited single-crystal BCC solids of pure metals and quaternary alloys have shown pseudoelastic behavior at low temperatures and high strain rates. The deformation mechanisms investigated using classical molecular simulations under tensile-compressive loading reveal temperature-dependent pseudoelastic behavior aided by twinning during the loading-unloading cycle. The pseudoelasticity is found to be independent of loading directions with identical cyclic deformation characteristics during uniaxial loading. Additionally, temperature variation from 77 to 1500 K enhances the elastic strain recovery in the alloy.This is a pre-print of the article Sharma, Aayush, Valery I. Levitas, Prashant Singh, Anup Basak, Ganesh Balasubramanian, and Duane D. Johnson. "Twinning-induced pseudoelastic behavior in (MoW)85(TaTi)7.5Zr7.5." arXiv preprint arXiv:1809.06822 (2018). Posted with permission.</p
Bogania neogranulata Cantrell 1980
No full textBogania neogranulata Cantrell, 1980 Bogania neogranulata Cantrell, 1980, p. 248–249, figs. 26, 30, 34. Record. *The Knoll, Mt. Tamborine, Queensland, Australia, collected 11 August, 1969, by B. K. Cantrell. Genus Bunofagea Star ę ga, 1992 Bunofagea Lawrence, 1959, p.: 82–83; Staręga, 1989, p. 5 [unavailable name, ICZN 13.3]; Staręga, 1992, p. 295.. Bunofagea Staręga, 1992: 295. Type species. Bunofagea gracilipes Lawrence, 1959, by original designation. Gender. Feminine. Diagnosis. Ocularium placed toward the anterior margin of the carapace. Proximal segment of chelicers with shallow bulla. Legs unarmed, with leg II much longer than leg IV and three times the length of the body; tarsal formula 3: 4: 5: 6. Distitarsus I with two articles, distitarsus II with three articles. Male genitalia long, slender; ventral plate defined only as a distal tapering setigerous portion of truncus; with 4 pairs of lateral and two pair of ventrodistal small acuminate setae and one very large foliaceous seta; stragulum long and tubular, with two pairs of square terminal processes, stylus flagelliform and needlelike; no rutrum and no pergula. Remarks. Originally in Phalangodinae, transferred to Zalmoxidae by Staręga (1992). The general appearance of this genus suggests a distant relationship to Zalmoxidae, The penis of a paratype of Bunofagea gracilipes has been dissected and examined by us, and it includes structures characteristic of Phalangodidae (Fig. 2); we therefore consider Bunofagea to be a member of Phalangodidae new familial assignment. Furthermore, the related monotypic Madagascan genus Remyus Roewer, 1949 has been included in a molecular phylogeny and subsequently transferred to Phalangodidae (Sharma & Giribet, in press), suggesting a similar placement for Bunofagea.Published as part of Sharma, Prashant P., Kury, Adriano B. & Giribet, Gonzalo, 2011, Zalmoxidae (Arachnida: Opiliones: Laniatores) of the Paleotropics: a catalogue of Southeast Asian and Indo-Pacific species, pp. 37-58 in Zootaxa 2972 on page 41, DOI: 10.5281/zenodo.20662
Miopsalis dillyi Schmidt & Clouse & Sharma 2020, sp. nov.
No full text<i>Miopsalis dillyi</i> sp. nov. <p>(Figs. 1–4, Tables 1–2)</p> <p> <b>Types.</b> Male holotype (NMP) from Center for Environmental Development and Recreation (CEDAR), Impalutao, Impasug-ong, Bukidnon Province, Mindanao I., Philippines, 767 m alt. (8.254894°N, 125.035732°E), leg. D. Mohagan, D.J.B. Mohagan, V. Yamba, D.E.M. General, R.M. Clouse, 3 July 2014, from sifted leaf litter. Two male (both dissected for genitalia) and one female paratypes in 96% EtOH (MCZ 154598), same collecting data as for holotype; 1 male mounted on SEM stubs (MCZ 154599), same collecting data as for holotype. One male and 2 female paratypes in 96% EtOH (MCZ 154600) from Center for Environmental Development and Recreation (CEDAR), Impalutao, Impasug-ong, Bukidnon Province, Mindanao I., Philippines, 775 m alt. (8.254933°N, 125.035749°E), leg. D. Mohagan, V. Yamba, R. M. Clouse, 30 June 2014, from sifted leaf litter. One male and 2 female paratypes in 96% EtOH (MHNG) from Center for Environmental Development and Recreation (CEDAR), Impalutao, Impasug-ong, Bukidnon Province, Mindanao I., Philippines, 775 m alt. (8.254933°N, 125.035749°E), leg. D. Mohagan, V. Yamba, R. M. Clouse, 30 June 2014, from sifted leaf litter. One male paratype (1 dissected for genitalia) in 96% EtOH (MCZ 154601) from western slope of Mt. Kitanglad, Lantapan, Kaatoan, Bukidnon Province, Mindanao I., Philippines, 1300 m alt. (8.072258°N, 125.008909°E), leg. A. Mohagan, D. Mohagan, D.J.B. Mohagan, V. Yamba, R. M. Clouse, 1 July 2014, from sifted leaf litter. Two female paratypes (extracted for DNA) in 96% EtOH (MCZ 154602) and 1 female paratype on SEM stubs (MCZ 154603), from western slope of Mt. Kitanglad, Lantapan, Kaa- toan, Bukidnon Province, Mindanao I., Philippines, 1300 m alt. (8.072258°N, 125.008909°E), leg. A. Mohagan, D. Mohagan, D.J.B. Mohagan, V. Yamba, R. M. Clouse, 1 July 2014, from sifted leaf litter.</p> <p> <b>Additional material studied.</b> Three juveniles (1 extracted for DNA; MCZ) in 96% EtOH from Center for Environmental Development and Recreation (CEDAR), Impalutao, Impasug-ong, Bukidnon Province, Mindanao I., Philippines, 775 m alt. (8.254933° N, 125.035749° E), leg. D. Mohagan, V. Yamba, R. M. Clouse, 30 June 2014, from sifted leaf litter.</p> <p> <b>Etymology.</b> The specific epithet honors the invertebrate physiologist Geoffrey Fowler Dilly.</p> <p> <b>Diagnosis.</b> Medium-sized (ca. 3.6 mm) Cyphophthalmi presenting a character combination diagnostic for <i>Miopsalis</i>: distinct eyes, anal gland pore and Rambla’s organ present, distinct sternum, extensive sculpturing on second cheliceral article, nearly parallel ventral opisthosomal sulci, nearly straight posterior margin of gonostome, and coxae II and IV each with distinct meeting points in males. Male also with distinct solea on tarsus I; presence of digiti of the gonopore complex; and arrangement of five ventral microtrichia of spermatopositor, with one proximal microtrichium on ventral midline and four subdistal microtrichia arranged in an arc. Distinguished from congeners by unique combination of medium size, and presence of anal gland pore, eyes, Rambla’s organ, prominent second ventral cheliceral process, and claw-like chelicerae. For example, <i>M. mulu</i> (Shear, 1993) and <i>M. sabah</i> (Shear, 1993) are also medium-sized and have anal gland pores, but they have attenuate chelicerae and no Rambla’s organ; <i>M. gryllospeca</i> (Shear, 1993) has a small Rambla’s organ, claw-like chelicerae, and a large second ventral cheliceral process, but lacks an anal gland pore and is considerably larger (> 5 mm) (see table 1 and figure 19 in Clouse 2012 for further comparison).</p> <p> <b>Description.</b> Length of holotype (female paratype in parentheses) 3.64 (3.59); maximum body width 1.93 (1.84) at third opisthosomal segment; length/width ratio 1.88 (1.95). Distance between ozopores, 1.67 (1.61) (Fig. 1)</p> <p>Body oval, dark orange-coloured to reddish brown (in alcohol) depending on incidence of light (Fig. 1). Body almost entirely with a dense tuberculate-microgranulate surface microstructure. Distinct eye lenses anterior to Type I ozophores (Juberthie 1970; see also Giribet 2003) (Fig. 1C, F). Mid-dorsal, longitudinal opisthosomal sulcus absent (male; Fig. 1A) or poorly defined (female; Fig. 1D). Posterior end of body evenly rounded. Coxae of leg II fused to coxae of legs III and IV (Fig. 2A, 2B). Sternum present (Fig. 2A, 2B). Proximal end of coxae I or III of males not meeting along the midline (in females, only coxae II meeting in midline; Fig. 2A, B). Male gonostome semicircular to trapezoidal, with weakly concave posterior edge, without cuticular projections (Fig. 2A). Spiracles C-shaped (Fig. 2A, B). Sternal opisthosomal glands absent. Sternites 8 and 9 and tergite IX free. Tergite IX of male distinctly bilobed. Anal plate of male with indistinct, raised, medial, longitudinal area lacking granulation, with shallow medial groove posteriorly (Fig. 2C, D). Anal gland pore present in male (Fig. 2C).</p> <p>Chelicerae (Fig. 3A) not of the protruding type (Giribet 2003) and claw-like (Clouse 2012), distal article/median article ratio 0.32 (0.31); widest part of median cheliceral article near the base and with ornamentation concentrated proximally; proximal article with dorsal crest and two distinct ventral processes. Palpal trochanter without ventral process (Fig. 3B). Legs with all metatarsi and tarsi ornamented; claws of all legs smooth (Fig. 3 C–K). Tarsus I with a distinct solea (Fig. 3D, J). Rambla’s organ of male small, oval in shape, in distal portion of tarsus IV adjacent to tarsal claw (Fig. 3I). Adenostyle conspicuous, subtriangular, robust, fringing at the tip; located in proximal half of tarsus (Fig. 3I). Appendage measurements provided in Tables 1–2.</p> <p>Spermatopositor (Fig. 4), examined in three male paratypes, in dorsal view with eight long microtrichia on each side, their bases separated at midline. Dorsal microtrichia without serration (Fig. 4A). Ventral side with small denticles and five microtrichia, i.e. one proximal microtrichium on the ventral midline and four subdistal microtrichia arranged in an arc (Fig. 4B). Gonopore complex with a pair of long and gracile digiti (Fig. 4C).</p> <p> <b>Variation.</b> Range of measurements of males (n=4) and females (n=6, in parentheses): Body length 3.48–3.79 (3.59–3.85), maximum width 1.82–1.96 (1.84–1.94).</p> <p> <b>Distribution.</b> Known only from the two localities provided.</p>Published as part of <i>Schmidt, Stephanie M., Clouse, Ronald M. & Sharma, Prashant P., 2020, A new Miopsalis from Mindanao supports a biogeographic umbilicus between Borneo and the southern Philippines (Arachnida: Opiliones: Cyphophthalmi: Stylocellidae), pp. 379-390 in Zootaxa 4779 (3)</i> on pages 381-385, DOI: 10.11646/zootaxa.4779.3.6, <a href="http://zenodo.org/record/3835431">http://zenodo.org/record/3835431</a>
VOLUMETRIC WEAR ANALYSIS OF HIP JOINT IMPLANTS BY OPTICAL METHODS
No full textPredložená dizertačná práca sa zaoberá analýzou opotrebenia totálnych bedrových endoprotéz za použitia optických metód. V práci bol predstavený nový prístup hodnotenia objemového úbytku materiálu pomocou 3D optického skeneru. Tento nový prístup je časovo efektívny, poskytuje veľké množstvo snímaných bodov na povrchu implantátu. Množstvo bodov umožňuje presnejšiu rekonštrukciu pôvodnej geometrie a prípadné rekonštrukcie nežiaducich poškodení polyetylénovej vložky pri extrakcii. Predstavené metóda bola validovaná za pomoci štandardizovanej gravimetrickej metódy v súlade s ISO 14242. Následne bol optická skenovacia metóda použitá v troch štúdiách zameraných na analýzu opotrebenia, mechanické zmeny artikulujúceho povrchu a mikroštruktúrne zmeny v dôsledku zlyhania implantátu. Analýza 23 extrahovaných polyetylénových vložiek typ Bicon - plus s rozšíreným použitím v Českej republike poukázala na niektoré problémy spojené so zlyhaním implantátu. Adhezívno - abrazívne opotrebenie bolo identifikované v oblasti penetrácie femurálnej hlavice a následné poškodenia ako delaminácia materiálu , plastické deformácie a pitting boli pozorované v okolí tejto oblasti. Analýza materiálových vlastností poukázala na degradáciu mechanických a chemických vlastností, čo bolo prevažne závislé od rozsahu opotrebenia implantátu. U implantátov boli pozorované výrazné plastické deformácie , nárast oxidačného indexu a nižší pomer tvrdosti voči modulu elasticity, v porovnaní s novými vzorkami. Tečenie materiálu a plastické deformácie, ktoré vykazovali všetky extrahované vzorky boli analyzované v závere predloženej dizertačnej práce, na základe testov na nových implantátoch v zábehovom cykle. Cieľom práce je uviesť nový prístup analýzy opotrebenia polyetylénových vložiek za pomoci optických skenovacích metód a preukázať jeho použiteľnosť na analýze súboru extrahovaných implantátov. Výsledky získané pomocou tejto metódy sa ukázali ako vhodné a môžu viesť k lepšiemu pochopeniu procesov opotrebenia a zlyhávania implantátov
Marketing of renewable energy: emerging themes and their directions using interpretive structural modeling
No full textToday, the need for renewable energy is omnipresent as all the nations, including developed and developing economies, are struggling with environmental problems like ‘greenhouse gas emissions’, ‘climate change’, ‘increase in carbon footprints’, and ‘global warming’. Businesses are also getting affected to reshape their models for implementing effective marketing strategies to increase and satisfy the demand for renewable energies. This business shift has catered to the attention of business scholars across the globe. Despite the surge in interest of business scholars, the extent field appears to be fragmented and the factors leading to adoption of renewable energies at different levels are in their complex state. Therefore, our article sheds light on emerging themes using keyword analysis and integrates a model using Interpretive Structural Modeling (ISM) to structure the directions of the enablers of renewable energies. Our study guides academicians and policy makers regarding the milestones upon which the field has embarke
Significance of the high charge state of projectile ions inside the target and its role in electron capture leading to target-ionization phenomena
Full text linkThe K x-ray spectra of different targets (Cu, Zn, and Ge) induced by 3-5 MeV/u Si projectile ions have been measured to determine the K-shell ionization cross section. A significant difference is observed between the measurements and theoretical estimates, with the latter being about 50% below the experimental results. This underestimation is attributed to the charge exchange from the target K shell to projectile K and L shells. Such an observation can only be possible if the projectile ions attain up to H- and He-like charge states. Corresponding projectile charge state fractions have been evaluated from the Lorentzian charge state distribution, where the mean charge state is taken from the Fermi gas model [W. Brandt, Phys. Rev. Lett. 30, 358 (1973)PRLTAO0031-900710.1103/PhysRevLett.30.358] and the width from the Novikov and Teplova approach [Phys. Lett. A 378, 1286 (2014)10.1016/j.physleta.2014.03.004]. The sum of the direct ionization cross section and K-K+K-L capture cross sections gives a good agreement with the measured cross sections. Furthermore, we have validated this methodology with available data for a Si ion on Ti target. Such results may be useful in many solid target-based applications.Fil: Chatterjee, Soumya. University Of Kalyani; IndiaFil: Sharma, Prashant. Weizmann Institute Of Science Israel; IsraelFil: Singh, Shashank. Panjab University; IndiaFil: Oswal, Mumtaz. No especifíca;Fil: Kumar, Sunil. No especifíca;Fil: Montanari, Claudia Carmen. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Mitra, D.. University Of Kalyani; IndiaFil: Nandi, T.. No especifíca
Interpretable machine learning-guided design of Fe-based soft magnetic alloys
Full text linkWe present a machine-learning guided approach to predict saturation magnetization (MS) and coercivity (HC) in Fe-rich soft magnetic alloys, particularly Fe-Si-B systems. ML models trained on experimental data reveals that increasing Si and B content reduces MS from 1.81T (DFT~2.04 T) to ~1.54 T (DFT~1.56T) in Fe-Si-B, which is attributed to decreased magnetic density and structural modifications. Experimental validation of ML predicted magnetic saturation on Fe-1Si-1B (2.09T), Fe-5Si-5B (2.01T) and Fe-10Si-10B (1.54T) alloy compositions further support our findings. These trends are consistent with density functional theory (DFT) predictions, which link increased electronic disorder and band broadening to lower MS values. Experimental validation on selected alloys confirms the predictive accuracy of the ML model, with good agreement across compositions. Beyond predictive accuracy, detailed uncertainty quantification and model interpretability including through feature importance and partial dependence analysis reveals that MS is governed by a nonlinear interplay between Fe content, early transition metal ratios, and annealing temperature, while HC is more sensitive to processing conditions such as ribbon thickness and thermal treatment windows. The ML framework was further applied to Fe-Si-B/Cr/Cu/Zr/Nb alloys in a pseudo-quaternary compositional space, which shows comparable magnetic properties to NANOMET (Fe84.8Si0.5B9.4Cu0.8 P3.5C1), FINEMET (Fe73.5Si13.5B9 Cu1Nb3), NANOPERM (Fe88Zr7B4Cu1), and HITPERM (Fe44Co44Zr7B4Cu1. Our fundings demonstrate the potential of ML framework for accelerated search of high-performance, Co- and Ni-free, soft magnetic materials.This is a preprint from Nachnani, Aditi, Kai K. Li-Caldwell, Saptarshi Biswas, Prince Sharma, Gaoyuan Ouyang, and Prashant Singh. "Interpretable machine learning-guided design of Fe-based soft magnetic alloys." arXiv preprint arXiv:2504.19787 (2025). doi: https://doi.org/10.48550/arXiv.2504.19787
Pseudoelastic deformation in Mo-based refractory multi-principal element alloys
Full text linkPhase diagrams supported by density functional theory methods can be crucial for designing high entropy alloys that are subset of multi-principal-element alloys. We present phase and property analysis of quinary (MoW)(x)Zr-y(TaTi)(1-x-y) refractory high-entropy alloys from combined Calculation of Phase Diagram (CALPHAD) and density-functional theory results, supplemented by molecular dynamics simulations. Both CALPHAD and density-functional theory analysis of phase stability indicates a Mo-W-rich region of this quinary has a stable single-phase body-centered-cubic structure. We report first quinary composition from Mo-W-Ta-Ti-Zr family of alloy with pseudo-elastic behavior, i.e., hysteresis in stress-strain. Our analysis shows that only Mo-W-rich compositions of Mo-W-Ta-Ti-Zr, i.e., Mo + W >= 85 at. % , show reproducible hysteresis in stress-strain responsible for pseudo-elastic behavior. The (MoW)(85)Zr-7.5(TaTi)(7.5) was down-selected based on temperature-dependent phase diagram analysis and molecular dynamics simulations predicted elastic behavior that reveals twinning-assisted pseudoelastic behavior. While mostly unexplored in body-centered-cubic crystals, twinning is a fundamental deformation mechanism that competes against dislocation slip in crystalline solids. This alloy shows identical cyclic deformation characteristics during uniaxial loading, i.e., the pseudoelasticity is isotropic in loading direction. Additionally, a temperature increase from 77 to 1,500 K enhances the elastic strain recovery in load-unload cycles, offering possibly control to tune the pseudoelastic behavior.This is a manuscript of an article published as Sharma, Aayush, Prashant Singh, Tanner Kirk, Valery I. Levitas, Peter K. Liaw, Ganesh Balasubramanian, Raymundo Arroyave, and Duane D. Johnson. "Pseudoelastic deformation in Mo-based refractory multi-principal element alloys." Acta Materialia 220 (2021): 117299. DOI: 10.1016/j.actamat.2021.117299. Copyright 2021 Acta Materialia Inc.
DOE Contract Number(s): AC02-07CH11358.
Posted with permission
VOLUMETRIC WEAR ANALYSIS OF HIP JOINT IMPLANTS BY OPTICAL METHODS
No full textPredložená dizertačná práca sa zaoberá analýzou opotrebenia totálnych bedrových endoprotéz za použitia optických metód. V práci bol predstavený nový prístup hodnotenia objemového úbytku materiálu pomocou 3D optického skeneru. Tento nový prístup je časovo efektívny, poskytuje veľké množstvo snímaných bodov na povrchu implantátu. Množstvo bodov umožňuje presnejšiu rekonštrukciu pôvodnej geometrie a prípadné rekonštrukcie nežiaducich poškodení polyetylénovej vložky pri extrakcii. Predstavené metóda bola validovaná za pomoci štandardizovanej gravimetrickej metódy v súlade s ISO 14242. Následne bol optická skenovacia metóda použitá v troch štúdiách zameraných na analýzu opotrebenia, mechanické zmeny artikulujúceho povrchu a mikroštruktúrne zmeny v dôsledku zlyhania implantátu. Analýza 23 extrahovaných polyetylénových vložiek typ Bicon - plus s rozšíreným použitím v Českej republike poukázala na niektoré problémy spojené so zlyhaním implantátu. Adhezívno - abrazívne opotrebenie bolo identifikované v oblasti penetrácie femurálnej hlavice a následné poškodenia ako delaminácia materiálu , plastické deformácie a pitting boli pozorované v okolí tejto oblasti. Analýza materiálových vlastností poukázala na degradáciu mechanických a chemických vlastností, čo bolo prevažne závislé od rozsahu opotrebenia implantátu. U implantátov boli pozorované výrazné plastické deformácie , nárast oxidačného indexu a nižší pomer tvrdosti voči modulu elasticity, v porovnaní s novými vzorkami. Tečenie materiálu a plastické deformácie, ktoré vykazovali všetky extrahované vzorky boli analyzované v závere predloženej dizertačnej práce, na základe testov na nových implantátoch v zábehovom cykle. Cieľom práce je uviesť nový prístup analýzy opotrebenia polyetylénových vložiek za pomoci optických skenovacích metód a preukázať jeho použiteľnosť na analýze súboru extrahovaných implantátov. Výsledky získané pomocou tejto metódy sa ukázali ako vhodné a môžu viesť k lepšiemu pochopeniu procesov opotrebenia a zlyhávania implantátov.This dissertation thesis deals with wear analysis of total hip replacements (THR) using optical methods. We introduced a new approach to volumetric wear assessments of polyethylene liners using a 3D optical scanner. The new approach brought benefits of time-efficient measurements, large number of points collected for post-processing, the possibility to create pre-worn models of retrieved samples as well as the possibility to exclude damages caused by surgeon during revision surgeries. The method was validated by gravimetric method according to the ISO 14242 Standard. The new approach was then used in three studies focusing on wear rate and mechanical changes of polyethylene liners. In the studies, the analysis of polyethylene liners geometry was followed by a detailed surface analysis of contact areas down to the microstructural level. Clinical history data for 23 retrieved liners combined with wear analysis showed several issues affecting failure of the polyethylene implants. We worked with Bicon-plus type implants, that are widely used in clinical practice in the Czech Republic. Structural surface analysis of the retrieved samples showed several different wear mechanisms such as adhesion/abrasion, pitting, delamination and plastic deformation. Analysis of material behaviour showed mechanical changes and chemical degradation in retrieved prostheses which mostly correlated with the wear depth. Investigated samples showed plastic deformations, an increased oxidation index and lower hardness to elasticity ratio compared to the new samples. Creep phenomenon or plastic deformation, which was investigated in the final part of thesis, occurred in all the retrieved samples. Further in vitro testing showed presence of creep in the run-in phase of implants. This thesis aimed to introduce a new approach to wear analysis using the optical scanning method and to apply the new approach for investigations of surface geometry of retrieved polyethylene liners. The method proved to be a suitable method for investigations of retrieved polyethylene liners helping to better understand the processes leading to implant failures.
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