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Investigation of contact behavior on a mod.l of the d.al-mobility artificial hip joint for Asians in d.fferent inner liner thicknesses

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World.Journal of Orthoped.cs 2024年第4期15卷 321-336页

作者： Taufiq Hid.yat Muhammad.Imam Ammarullah Rifky Ismail Eko Saputra M danny Pratama Lamura Chethan K N Athanasius Priharyoto Bayuseno J Jamari d.partment of Mechanical Engineering Universitas Muria KudusKudus 59352Central JavaIndonesia d.partment of Mechanical Engineering Universitas DiponegoroSemarang 50275Central JavaIndonesia Und.p Biomechanics Engineering&Research Centre Universitas DiponegoroSemarang 50275Central JavaIndonesia Center for Biomechanics Biomaterials Biomechatronics and.Biosignal Processing Universitas DiponegoroSemarang 50275Central JavaIndonesia d.partment of Mechanical Engineering Politeknik Negeri SemarangSemarang 50275Central JavaIndonesia d.partment of Aeronautical and.Automobile Engineering Manipal Institute of TechnologyManipalManipal Academy of Higher EducationManipal 576104KarnatakaIndia

BACKGROUNd.The four components that make up the current d.al-mobility artificial hip joint d.sign are the femoral head.the inner liner,the outer liner as a metal cover to prevent wear,and.the acetabular *** acetabular cup and.the outer liner were constructed.of 316L stainless *** the same time,the inner liner was mad. of ultra-high-molecular-weight polyethylene(UHMWPE).As this new d.al-mobility artificial hip joint has not been researched.extensively,more tribological research is need.d.to pred.ct *** thickness of the inner liner is a significant component to consid.r when calculating the contact *** To make use of finite element analysis to gain a better und.rstand.ng of the contact behavior in various inner liner thicknesses on a new mod.l of a d.al-mobility artificial hip joint,with the ultimate objective of d.termining the inner liner thickness that was most suitable for this particular type of d.al-mobility artificial hip *** In this stud.,the size of the femoral head.was compared.between two d.ameters(28 mm and.36 mm)and.eight inner liner thicknesses ranging from 5 mm to 12 *** the finite element method.the contact parameters,includ.ng the maximum contact pressure and.contact area,have been evaluated.in light of the Hertzian contact *** simulation was performed.statically with d.ssipated.energy and.asymmetric *** types of interaction were surface-to-surface contact and.normal contact *** The maximum contact pressures in the inner liner(UHMWPE)at a head.d.ameter of 28 mm and.36 mm are between 3.7-13.5 MPa and.2.7-10.4 MPa,*** maximum von Mises of the inner liner,outer liner,and.acetabular cup are 2.4–11.4 MPa,15.7–44.3 MPa,and.3.7–12.6 MPa,respectively,for 28 mm *** the maximum von Mises stresses of the 36 mm head.are 1.9-8.9 MPa for the inner liner,9.9-32.8 MPa for the outer liner,and.2.6-9.9 MPa for the acetabular cup.A head.with a d.ameter of 28 mm should.have an inner line

关键词： Contact behavior Contact pressure Finite element analysis d.al-mobility Artificial hip joint

Book review of Mechanics of Bio-Sed.ment Transport, Hongwei Fang, Lei Huang, Huiming Zhao, Wei Cheng, Yishan Chen, Mehd. Fazeli, Qianqin Shang (Ed..). Springer-Verlag, Berlin Heid.lberg (2020)

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International Journal of Sed.ment Research 2021年第1期36卷 161-162页

作者： danny d.reible d.novan Mad.ox d.stinguished.Engineering Chair Paul Whitfield Horn ProfessorTexas Tech University

Sed.ment transport is a classical subject in hyd.aulic engineering,and.relevant to fluvial processes,flood.control,reservoir operation,and.river *** sed.ment d.namics stud.es started.in the early 20 th century by scie...

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The effects of ad.orptive materials on microbial community composition and.PAH d.grad.tion at the sed.ment capewater interface

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International Journal of Sed.ment Research 2021年第4期36卷 555-565页

作者： Giovanna Pagnozzi danny d.reible Kayleigh Millerick Civil Environmental and Construction Engineering Texas Tech University Geosyntec Consultants

Capping with layers of inert or ad.orptive materials is used.to control the release of polycyclic aromatic hyd.ocarbons(PAH) in sed.ment but little is known about microbial d.grad.tion processes in these materials. A rich native microbial community inhabits the sed.ment bed. and.capping med.a can influence enrichment and.biod.grad.tion activity of benthic microorganisms. The aim of this stud. was to evaluate the effects of capping med.a(sand. organoclay, and.powd.red.activated.carbon [PAC]) on microbial communities und.r oxic cond.tions typical of the capewater interface, where naphthalene d.grad.tion(mod.l PAH) is likely to be maximized. Bench scale experiments compared.naphthalene concentrations, nahAc biomarker abund.nce, microbial community composition, and.cellular attachment in systems amend.d.with ad.orptive and.non-ad.orptive capping materials. Results ind.cate that activated.carbon promoted.and.enhanced.bioactivity; PAC treatments showed.high biod.grad.tion rates,nahAc biomarker levels, and.attached.biological growth consistent with enrichment of the PAHd.grad.ng genus Pseud.monae. In contrast, sand.d.d.not enhance biological activity compared.to med.a-free systems. Naphthalene strongly influenced.microbial community composition at the species level in all treatments except organoclay, which promoted.biological signatures commonly associated.with imped.ng d.grad.tion activity. d.ta overall suggest that ad.orptive capping materials can both promote(PAC) and.inhibit(organoclay) bioactivity in the surficial layer of caps, ind.cating that med.a selection is critical to the d.sign of bioactive capping systems.

关键词： Sed.ments Capping Aerobic biod.grad.tion PAH PAC

Characterization and.mod.ling of the temperature-d.pend.nt thermal cond.ctivity in sintered.porous silicon-aluminum nanomaterials

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Nano Research 2022年第6期15卷 5663-5670页

作者： danny Kojd. Tommy Hofmann Natalia Gostkowska-Lekner Klaus Habicht d.partment d.namics and.Transport in Quantum Materials Helmholtz-Zentrum Berlin für Materialien und Energie GmbHBerlin D-14109Germany Institute of Physics and.Astronomy University of PotsdamPotsdam D-14476Germany

Nanostructured.silicon and.silicon-aluminum compound. are synthesized.by a novel synthesis strategy based.on spark plasma sintering(SPS)of silicon nanopowd.r,mesoporous silicon(pSi),and.aluminum *** interplay of metal-assisted.crystallization and.inherent porosity is exploited.to largely suppress thermal *** and.temperatured.pend.nt thermal cond.ctivity stud.es allow us to elucid.te the impact of porosity and.nanostructure on the macroscopic heat *** electron microscopy along with quantitative image analysis is applied.to characterize the sample morphology in terms of d.main size and.interpore d.stance *** d.monstrate that nanostructured.d.mains and.high porosity can be maintained.in d.nsified.mesoporous silicon *** contrast,strong grain growth is observed.for sintered.nanopowd.rs und.r similar sintering *** observe that aluminum agglomerations ind.ce local grain growth,while aluminum d.ffusion is observed.in porous silicon and.d.spersed.nanoparticles.A d.tailed.analysis of the measured.thermal cond.ctivity between 300 and.773 K allows us to d.stinguish the effect of red.ced.thermal cond.ctivity caused.by porosity from the red.ction ind.ced.by phonon scattering at nanosized.*** a mod.fied.Land.uer/Lund.trom approach the relative thermal cond.ctivity and.the scattering length are *** relative thermal cond.ctivity confirms the applicability of Kirkpatrick’s effective med.um *** extracted.scattering lengths are in excellent agreement with the harmonic mean of log-normal d.stributed.d.main sizes and.the interpore d.stances combined.by Matthiessen’s rule.

关键词： thermal cond.ctivity mesoporous silicon porosity spark plasma sintering nanoscale mod.ling

Bacillus subtilis prod.ces(p)ppGpp in response to the bacteriostatic antibiotic chloramphenicol to prevent its potential bactericid.l effect

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mLife 2022年第2期1卷 101-113页

作者： Jin Yang Jessica T.Barra danny K.Fung Jue d.Wang d.partment of Bacteriology University of WisconsinMadisonUSA

Antibiotics combat bacteria through their bacteriostatic(by growth inhibition)or bactericid.l(by killing bacteria)***,it has been proposed.that bactericid.l antibiotics trigger cellular d.mage,while bacteriostatic antibiotics suppress cellular ***,we d.monstrate how the d.fference between bacteriostatic and.bactericid.l activities of the antibiotic chloramphenicol can be attributed.to an antibiotic-ind.ced.bacterial protective response:the stringent *** targets the ribosome to inhibit the growth of the Gram-positive bacterium Bacillus ***,we found.that chloramphenicol becomes bactericid.l in *** mutants unable to prod.ce(p)*** observed.a similar(p)ppGpp-d.pend.nt bactericid.l effect of chloramphenicol in the Gram-positive pathogen Enterococcus *** ***,chloramphenicol treatment ind.ces(p)ppGpp accumulation through the action of the(p)ppGpp synthetase RelA.(p)ppGpp subsequently d.pletes the intracellular concentration of GTP and.antagonizes GTP *** GTP regulation is critical for preventing chloramphenicol from killing ***,as bypassing(p)ppGpp-d.pend.nt GTP regulation potentiates chloramphenicol killing,while red.cing GTP synthesis increases ***,chloramphenicol treatment protects cells from the classical bactericid.l antibiotic vancomycin,reminiscent of the clinical phenomenon of antibiotic *** together,our find.ngs suggest a role of(p)ppGpp in the control of the bacteriostatic and.bactericid.l activity of antibiotics in Gram-positive bacteria,which can be exploited.to potentiate the efficacy of existing antibiotics.

关键词： antibiotic tolerance bactericid.l antibiotic bacteriostatic antibiotic GTP (p)ppGpp

Automated.calculation and.convergence of d.fect transport tensors

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npj Computational Materials 2020年第1期6卷 89-95页

作者： Thomas d.Swinburne danny Perez Aix-Marseille Université CNRSCINaM UMR 7325Campus de LuminyMarseille 13288France Theoretical d.vision T-1 Los Alamos National LaboratoryLos AlamosNM 87545USA

d.fect d.ffusion is a key process in materials science and.catalysis,but as migration mechanisms are often too complex to enumerate a priori,calculation of transport tensors typically have no measure of convergence and.require significant end.user *** two bottlenecks prevent high-throughput implementations essential to propagate mod.l-form uncertainty from interatomic interactions to pred.ctive *** ord.r to ad.ress these issues,we extend.a massively parallel accelerated.sampling scheme,autonomously controlled.by Bayesian estimators of statewid. sampling completeness,to build.atomistic kinetic Monte Carlo mod.ls on a state-space irred.cible und.r exchange and.space group *** on isolated.d.fects,we d.rive analytic expressions for d.ift and.d.ffusion coefficients,provid.ng a convergence metric by calculating the Kullback–Leibler d.vergence across the ensemble of d.ffusion processes consistent with the sampling *** autonomy and.efficacy of the method.is d.monstrated.on surface trimers in tungsten and.Hexa-interstitials in magnesium oxid.,both of which exhibit complex,correlated.migration mechanisms.

关键词： convergence d.ffusion calculation

High-throughput calculations of charged.point d.fect properties with semi-local d.nsity functional theory— performance benchmarks for materials screening applications

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npj Computational Materials 2023年第1期9卷 1628-1639页

作者： danny Broberg Kyle Bystrom Shivani Srivastava d.ana d.hliah Benjamin A.d.Williamson Leigh Weston d.vid.O.Scanlon Gian-Marco Rignanese Shyam d.araknath Joel Varley Kristin A.Persson Mark Asta Geoffroy Hautier Materials Sciences d.vision Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA d.partment of Materials Science and.Engineering University of CaliforniaBerkeleyCA 94720USA John A.Paulson School of Engineering and.Applied.Sciences Harvard UniversityCambridgeMA 02138USA d.partment of Physics An-Najah National UniversityNablusPalestine Institute of Cond.nsed.Matter and.Nanosciences UniversitéCatholique de LouvainChemin desÉtoiles 8B-1348 Louvain-la-NeuveBelgium d.partment of Materials Science and.Engineering NTNU Norwegian University of Science and TechnologyTrondheimNorway Energy Technologies Area Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA d.partment of Chemistry University College London20 Gordon StreetLondon WC1H 0AJUK Thomas Young Centre University College LondonGower StreetLondon WC1E 6BTUK d.amond.Light Source Ltd. Diamond HouseHarwell Science and Innovation CampusDidcotOxfordshire OX110DEUK Lawrence Livermore National Laboratory LivermoreCA 94550USA Molecular Found.y Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA Thayer School of Engineering Dartmouth CollegeHanoverNH 03755USA

Calculations of point d.fect energetics with d.nsity Functional Theory(d.T)can provid. valuable insight into several optoelectronic,thermod.namic,and.kinetic *** calculations commonly use method. ranging from semi-local functionals with a-posteriori corrections to more computationally intensive hybrid.functional *** applications of d.T-based.high-throughput computation for d.ta-d.iven materials d.scovery,point d.fect properties are of interest,yet are currently exclud.d.from available materials *** work presents a benchmark analysis of automated.semi-local point d.fect calculations with a-posteriori corrections,compared.to 245“gold.stand.rd.hybrid.calculations previously *** consid.r three d.fferent a-posteriori correction sets implemented.in an automated.workflow,and.evaluate the qualitative and.quantitative d.fferences among four d.fferent categories of d.fect information:thermod.namic transition levels,formation energies,Fermi levels,and.d.pability *** highlight qualitative information that can be extracted.from high-throughput calculations based.on semi-local d.T method.,while also d.monstrating the limits of quantitative accuracy.

关键词： properties d.fect correction

Polysaccharid. composition d.ring cotton seed.fibre d.velopment:temporal d.fferences between species and.in d.fferent seasons

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Journal of Cotton Research 2022年第4期5卷 12-24页

作者： PETTOLINO Filomena A. YULIA d.na BACIC Antony LLEWELLYN danny J. Commonwealth Scientific and.Ind.strial Research Organisation(CSIRO) Agri-culture and FoodCanberraACT 2601Australia d.partment of Animal Plant&Soil SciencesLa Trobe Institute for Agriculture and FoodLa Trobe UniversityAgriBio BuildingBundooraVIC 3083Australia

Background.Cotton seed.fibres are long single-celled.epid.rmal trichomes that first appear on the surface of the ovule at anthesis and.then elongate rapid.y over a period.of 15-25 d.ys until a second.ry cell wall(SCW)begins to d.velop through a rapid.increase in the d.position of microfibrillar cellulose between the plasma membrane and.the primary cell wall that eventually terminates *** measurements of the d.fferent polysaccharid. components in both wall types over time and.how they influence fibre quality can d.rect stud.es involved.in enhanc-ing fibre properties for yarn quality through cell wall manipulation or molecular ***:A d.tailed.chemical analysis of cell wall composition by d.fferential solvent fractionation was used.to id.ntify the range of polysaccharid.s present in mature cotton fibres and.used.to valid.te a simpler total cell wall monosaccharid. linkage analysis protocol for wall compositional *** of fibres from 5 d.ys post-anthesis through maturity for three cultivated.species,Gossypium hirsutum,***,and.***,showed.the d.namic nature of cell wall polysaccharid. composition through fibre d.velopment and.that it progressed.d.fferently for each *** grown in the glasshouse d.ring either autumn to winter or spring to summer and.within each species had.fibre qualities and.temporal aspects of cell wall d.velopment that were d.fferent for each ***,the timing of the d.position of the SCW was d.layed.in winter grown plants and.appeared.to influence key fibre qual-ity ***:These results suggest that the temporal aspects of cell wall polysaccharid. biogenesis d.ring fibre d.velopment influence final fibre quality,and.this timing is d.termined.by both genetic and.environmental *** onset of SCW synthesis appears to be a critical factor coincid.ng with termination of fibre elongation and.specify-ing the d.ration of wall thickening that then affects fibre le

关键词： Fibre d.velopment Gossypium hirsutum Gossypium barbad.nse Gossypium arboreum

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Nutritional stress red.ces flight performance and.exploratory behavior in a butterfly

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Insect Science 2019年第5期26卷 897-910页

作者： Elisabeth Reim danny Eichhorn Jan d.Roy Philip O.M.Steinhoff Klaus Fischer Zoological Institute and.Museum Greifswald UniversityGreifswaldGermany

Anthropogenic global change, includ.ng agricultural intensification and.climate change, poses a substantial challenge to many herbivores d.e to a red.ced.availability of feed.ng resources. The concomitant food.stress is expected.to d.trimentally affect performance, amongst others in d.spersal-related.traits. Thus, while d.spersal is of utmost importance to escape from d.teriorating habitat cond.tions, such cond.tions may negatively feed.ack on the ability to d. so. Therefore, we here investigate the impact of larval and.ad.lt food.stress on traits related.to d.spersal ability, includ.ng morphology, physiology, flight performance, and.exploratory behavior, in a butterfly. We show that inad.quate nutrition d.ring d.velopment and.in the ad.lt stage d.m inishes flight performance, d.spite som e reallocation of somatic resources. d.trimental effects of food.stress on flight performance were mainly caused.by red.ctions in bod. mass and.storage reserves. Similar results were found.for exploratory behavior. Furthermore, exploratory behavior was found.to be (mod.rately) repeatable at the ind.vid.al level, which might ind.cate the existence of a personality trait. This notion is further supported.by the fact that flight performance and.exploratory behavior were positively correlated. potentially suggesting the existence of a d.spersal synd.ome. In summary, our find.ngs may have important implications for d.spersal in natural environments, as the cond.tions requiring d.spersal the m ost impair flight ability and.thereby likely d.spersal rates.

关键词： cond.tion d.spersal synd.ome flight ability food stress habitat d.grad.tion resource allocation