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Development and characterization of 3D-printed electroconductive pHEMA-co-MAA nP-laden hydrogels for tissue engineering

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Bio-Design and Manufacturing 2024年第3期7卷 262-276页

作者： Sara De nitto Aleksandra Serafin Alexandra Karadimou Achim Schmalenberger John J.EMulvihill Maurice n.collins DIBRIS Polytechnic Inter-School Section University of Genoa16126 GenoaItaly School of Engineering Bernal InstituteUniversity of LimerickLimerick V94 T9PXIreland School of natural Sciences Department of Biological SciencesUniversity of LimerickLimerick V94 T9PXIreland Health Research Institute University of LimerickLimerick V94 T9PXIreland AMBER University of LimerickLimerick V94 T9PXIreland

Tissue engineering(TE)continues to be widely explored as a potential solution to meet critical clinical needs for diseased tissue replacement and tissue *** this study,we developed a poly(2-hydroxyethyl methacrylate-co-methacrylic acid)(pHEMA-co-MAA)based hydrogel loaded with newly synthesized conductive poly(3,4-ethylene-dioxythiophene)(PEDOT)and polypyrrole(PPy)nanoparticles(nPs),and subsequently processed these hydrogels into tissue engineered constructs via three-dimensional(3D)*** presence of the nPs was critical as they altered the rheological properties during ***,all samples exhibited suitable shear thinning properties,allowing for the development of an optimized processing window for 3D *** were 3D printed into pre-determined disk-shaped configurations of 2 and 10 mm in height and diameter,*** observed that the nPs disrupted the gel crosslinking efficiencies,leading to shorter degradation times and compressive mechanical properties ranging between 450 and 550 *** conductivity of the printed hydrogels increased along with the nP concentration to(5.10±0.37)×10^(−7)S/*** vitro studies with cortical astrocyte cell cultures demonstrated that exposure to the pHEMA-co-MAA nP hydrogels yielded high cellular viability and proliferation ***,hydrogel antimicrobial studies with staphylococcus epidermidis bacteria revealed that the developed hydrogels affected bacterial *** together,these materials show promise for various TE strategies.

关键词： Conductive nanoparticles Hydroxyethyl methacrylate(HEMA) Ultraviolet(UV)polymerization 3D printing

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Characterization of bright betatron radiation generated by direct laser acceleration of electrons in plasma of near critical density

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Matter and Radiation at Extremes 2024年第2期9卷 26-35页

作者： J.Cikhardt M.Gyrdymov S.Zähter P.Tavana M.M.Günther n.Bukharskii n.Borisenko J.Jacoby X.F.Shen A.Pukhov n.E.Andreev O.n.Rosmej Faculty of Electrical Engineering Czech Technical University in Prague16627 Prague 6Czech Republic Goethe University FrankfurtMax-von-Laue-Straße 160438 Frankfurt am MainGermany GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstraße 164291 DarmstadtGermany Focused Energy GmbH Im Tiefen See 4564293 DarmstadtGermany national Research nuclear University MEPhI Kashirskoe shosse 31115409 MoscowRussian Federation Lebedev Physical Institute RAS Leninskiy Prospekt 53119991 MoscowRussian Federation Heinrich-Heine-University Düsseldorf Universitätsstrasse 1DüsseldorfGermany Joint Institute for High Temperatures RASIzhorskaya st.13Bldg.2125412 MoscowRussian Federation Moscow Institute of Physics and Technology Institutskiy Pereulok 9141700 DolgoprudnyRussia

Directed x-rays produced in the interaction of sub-picosecond laser pulses of moderate relativistic intensity with plasma of near-critical density are investigated. Synchrotron-like (betatron) radiation occurs in the process of direct laser acceleration (DLA) of electrons in a relativisticlaser channel when the electrons undergo transverse betatron oscillations in self-generated quasi-static electric and magnetic fields. In anexperiment at the PHELIX laser system, high-current directed beams of DLA electrons with a mean energy ten times higher than the ponderomotive potential and maximum energy up to 100 MeV were measured at 10^(19) W/cm^(2)laser intensity. The spectrum of directed x-raysin the range of 5–60 kev was evaluated using two sets of Ross filters placed at 0°and 10°to the laser pulse propagation axis. The differential x-ray absorption method allowed for absolute measurements of the angular-dependent photon fluence. We report 10^(13) photons/sr withenergies >5 kev measured at 0°to the laser axis and a brilliance of 10^(21) photons s^(−1) mm^(−2) mrad−2(0.1%BW)−1. The angular distributionof the emission has an FWHM of 14°–16°. Thanks to the ultra-high photon fluence, point-like radiation source, and ultra-short emissiontime, DLA-based kev backlighters are promising for various applications in high-energy-density research with kilojoule petawatt-class laserfacilities.

关键词： laser acceleration critical

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Astrophysical S-factor and reaction rate for 15n(p,γ)16O within the modified potential cluster model

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Chinese Physics C 2024年第4期48卷 130-145页

作者： S.B.Dubovichenko A.S.Tkachenko R.Ya.Kezerashvili n.A.Burkova B.M.Yeleusheva Fesenkov Astrophysical Institute 050020 AlmatyKazakhstan new York City College of Technology City University of New YorkBrooklyn11201 New YorkUSA Graduate School and University Center City University of New York10016 New YorkUSA al-Farabi Kazakh national University 050040 AlmatyKazakhstan

We study radiative p^(15)n capture on the ground state of ^(16)O at stellar energies within the framework of a modified potential cluster model(MPCM)with forbidden states,including low-lying *** investigation of the ^(15)n(p,γ0)^(16)O reaction includes the consideration of ^(3)S_(1) resonances due to E1 transitions and the contribution of the ^(3)P_(1) scattering wave in the p+^(15)n channel due to the ^(3)P_(1)→^(3)P_(0)M1 *** calculated the astrophysical low-energy S-factor,and the extrapolated S(0)turned out to be within 34.7−40.4 kev·*** important role of the asymptotic constant(AC)for the ^(15)n(p,γ0)16O process with interfering ^(3)S_(1)(312)and ^(3)S_(1)(962)resonances is elucidated.A comparison of our calculation for the S-factor with existing experimental and theoretical data is addressed,and a reasonable agreement is *** reaction rate is calculated and compared with the existing *** has negligible dependence on the variation of AC but shows a strong impact of the interference of ^(3)S_(1)(312)and ^(3)S_(1)(962)resonances in reference to the CnO Gamow windows,especially at low *** estimate the contribution of cascade transitions to the reaction rate based on the exclusive experimental data from ***.C.85,065810(2012).The reaction rate enhancement due to the cascade transitions is observed from T_(9)>0.3 and reaches the maximum factor~1.3 at T_(9)=*** present the Gamow energy window and a comparison of rates for radiative proton capture reactions ^(12)n(p,γ)^(13)O,^(13)n(p,γ)^(14)O,^(14)n(p,γ)^(15)O,and ^(15)n(p,γ)^(16)O obtained in the framework of the MPCM and provide the temperature windows,prevalence,and significance of each process.

关键词： low and astrophysical energies p^(15)n system thermonuclear reaction rate potential cluster model CnO-cycle

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Hyaluronic acid association with bacterial,fungal and viral infections:Can hyaluronic acid be used as an antimicrobial polymer for biomedical and pharmaceutical applications?

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Bioactive Materials 2023年第1期19卷 458-473页

作者： Fernanda Zamboni Chun Kwok Wong Maurice n.collins Bernal Institute School of EngineeringUniversity of LimerickIreland Health Research Institute University of LimerickIreland Department of Chemical Pathology The Chinese University of Hong KongHong Kong Special Administrative Region

The relationships between hyaluronic acid(HA)and pathological microorganisms incite new understandings on microbial infection,tissue penetration,disease progression and lastly,potential *** understandings are important for the advancement of next generation antimicrobial therapeutical strategies for the control of healthcare-associated ***,this review will focus on the interplay between HA,bacteria,fungi,and *** review will also comprehensively detail and discuss the antimicrobial activity displayed by various HA molecular weights for a variety of biomedical and pharmaceutical applications,including microbiology,pharmaceutics,and tissue engineering.

关键词： Hyaluronic acid Hyaluronidase Virulence Antibacterial Antifungal Antiviral

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Evaluation of Particle Properties of MgO/TiO₂ Material by Monte Carlo Simulation Method

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Journal of Materials Science and Chemical Engineering 2024年第2期12卷 49-60页

作者： Koffi n’guessan Placide Gabin Allangba Yves Kily Hervé Fagnidi Hermann n’guessan Zié Traoré Koffi Arnaud Kamenan Physics Pedagogical Unit Laboratory of Environmental Science and Technology University Jean Lorougnon Guédé Daloa C&#244te d’Ivoire Laboratory of Fundamental and Applied Physics University Nangui Abrogoua Abidjan C&#244te d’Ivoire Department of Medical Physics University of Trieste and International Centre for Theoretical Physics (ICTP) Trieste Italy Department of Science and Technology University Alassane Ouattara Bouaké C&#244te d’Ivoire nuclear Physics and Radiation Protection Team Laboratory of Material Sciences Environment and Solar Energy University Felix Houphouet-Boigny Abidjan C&#244te d’Ivoire Department of Mathematics Physics and Chemistry UFR Biological Sciences University Peleforo Gon Coulibaly Korhogo C&#244te d’Ivoire

The simulation by the Monte Carlo method executed by the software PyPEnELOPE proved effective to specify the particle propagation characteristics by calculating the absorption fractions, backscattering and transmission of electrons and secondary photons under the incidence of 0.5 to 20 kev range of primary electrons. More than 99.9% of the primary electrons were transmitted in the 125 nm thick MgO/TiO2 material at 20 kev. This occurred because several interactions took place in the transmitted primary irradiation such as characteristic, fluorescence, and bremsstrahlung produced when of the occupation of the KL3, KL2, KM3, and KM2 shell and sub-shell of titanium and magnesium which are the elements with a high atomic number in the material. The transmission particle characteristic of this material is therefore an indicator capable of improving the electrical performance and properties of the sensor.

关键词： Monte Carlo PyPEnELOPE Primary Electrons Transmission MgO/TiO2

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In vitro properties of surface-modified solid lipid microspheres containing an antimalarial drug:halofantrine

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Asian Pacific Journal of Tropical Medicine 2011年第4期4卷 253-258页

作者： Anthony A Attama collins n Igbonekwu Department of Pharmaceutics University of Nigeria

Objective:To formulate and evaluate in vitro,surface-modified solid lipid microspheres containing hal of antrine using lipid matrix formed from goat fat and a phospholipid(P90H). Methods:The model drug,hal of antrine in an increasing concentration of 1%,2%,3%,4% and 5%w/w was incorporated into surface-modified solid lipid microspheres formulated by hot *** of drug concentration on the encapsulation efficiency was studied. The dispersion was evaluated using particle size,particle morphology,pH and encapsulation *** drug formulation with highest encapsulation efficiency was selected and used for the release studies and compared with the release from a commercial dosage form(Halfan~? 250 mg tablet,Claxo-Smithkline,Mayenne France) using simulated gastric fluid(SGF pH 1.2), simulated intestinal fluid(SIF pH 7.2) and phosphate buffer(pH 6.8) as biorelevant media. Results were analyzed statistically and the level of significance was taken to be Pnd spherical solid lipid microspheres were *** particle size of the dispersion was low(32.48-33.87μm) with minimal particle growth and high encapsulation efficiencies(86.8%-91.0%) after 3 *** pH of the microspheres dispersion changed appreciably after 3 *** vitro release result obtained revealed sustained and controlled drug release from the lipid microspheres compared with the tablet dosage ***: Formulation of hal of antrine as solid lipid microspheres presents a better alternative to the conventional tablet formulation as the in vitro dissolution of the highly lipophilic hal of antrine was highly improved.

关键词： Solid lipid microsphere Particle size stability Halofan trine Encapsulation efficiency Release studies In vitro evaluation

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The W3C Data Catalog Vocabulary,Version 2:Rationale,Design Principles,and Uptake

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Data Intelligence 2024年第2期6卷 457-487页

作者： Riccardo Albertoni David Browning Simon Cox Alejandra n.Gonzalez-Beltran Andrea Perego Peter Winstanley Istituto di Matematica Applicata e Tecnologie Informatiche"Enrico Magenes" Consiglio Nazionale delle Ricerche(IMATI-CNR)GenoaItaly Independent Consultant United Kingdom LandandWater CSiROMelbourneAustralia Scientific Computing Rutherford Appleton LaboratoryScience and Technology Facilities CouncilHarwell Cam-pusOx110QXUnited Kingdom European Parliament Luxembourg Semantic Arts Fort CollinsCO80524USA

DCAT is an RDF vocabulary designed to facilitate interoperability between data catalogs published on the *** its first release in 2014 as a W3C Recommendation,DCAT has seen a wide adoption across communities and domains,particularly in conjunction with implementing the FAIR data principles(forfindable,accessible,interoperable and reusable data).These implementation experiences,besides demonstrating the fitness of DCAT to meet its intended purpose,helped identify existing issues and ***,over the last few years,additional requirements emerged in data catalogs,given the increasing practice of documenting not only datasets but also data services and *** paper illustrates the new version of DCAT,explaining the rationale behind its main revisions and extensions,based on the collected use cases and requirements,and outlines the issues yet to be addressed in future versions of DCAT.

关键词： Data Catalogs Interoperability Discoverability FAIR data

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Developing a global interconnected power system model

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Global Energy Interconnection 2018年第3期1卷 330-343页

作者： Maarten Brinkerink Paul Deane Seán collins Brian Ó Gallachóir MaREI Centre Environmental Research Institute University College Cork School of Engineering University College Cork

Decarbonizing the power sector is a necessary step towards a low-carbon future. Interconnecting power systems on different continents could be a method to contribute to such a future, by utilizing highly efficient renewable resources around the globe, while simultaneously providing additional benefits of power system integration. In this paper, we describe the process of constructing and simulating a global interconnected power system model with high technical and temporal resolution. Being the first of its kind on the global scale, this paper is designed to showcase the proof of concept as an intermediate step to a high resolution global model, by integrating an existing European power system model with the north-American continent. The work to date has been focused on testing the methodology and building up necessary knowledge to realistically simulate the functionality of a possible future global grid. Some initial results are analysed to support the viability of the model and the concept in general. Furthermore, key factors influencing the development and optimal performance of the global interconnected power system model are identified.

关键词： Climate Change Scientific basis Effects and risk Addressing pathways Energy transition

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Macroscopic analysis of time dependent plasticity in Ti alloys

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Journal of Materials Science & Technology 2022年第29期124卷 135-140页

作者： Yi Xiong Phani S.Karamched Chi-Toan nguyen David M.collins Christopher M.Magazzeni Edmund Tarleton Angus J.Wilkinson Department of Materials University of OxfordParks RoadOxford OX13PHUnited Kingdom Department of Materials and Processes Safran SASafran TechMany-les-Hameaux 78772France School of Metallurgy and Materials University of BirminghamEdgbastonBirmingham B152TTUnited Kingdom Department of Engineering Science University of OxfordParks RoadOxford OX13PJUnited Kingdom

Cold dwell fatigue is the critical technological issue in Ti alloys used in the cooler front sections of aerospace jet *** subjected to a sustained load(stress dwell),the lifetime of these Ti components can be drastically reduced by as much as an order of magnitude[1–4].Without a clear understanding of the effect,safety concerns are raised.

关键词： alloys fatigue lifetime

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Occupational Health Hazards among Large-Scale Gold Mineworkers in Ghana

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Occupational Diseases and Environmental Medicine 2022年第3期10卷 149-166页

作者： Emmanuel Dartey Isaac Monney Kofi Sarpong collins Kuffour Department of Chemistry Education Akenten Appiah-Menka University of Skills Training and Entrepreneurial Development Mampong Ashanti Ghana Department of Environmental Health and Sanitation Education Akenten Appiah-Menka University of Skills Training and Entrepreneurial Development Mampong Ashanti Ghana

Introduction: The mining industry ranks among the most hazardous occupations globally owing to the high prevalence of workplace accidents. To better protect workers in the industry, there is a need for a comprehensive understanding of risk factors, common illnesses and provision of PPE. Objective: This study examined the prevalence and underlying risk factors to work-related injuries, common illnesses, and Personal Protective Equipment (PPE) usage among mineworkers in two large-scale mining companies in Ghana that consented to participation. Methodology: Two hundred mineworkers were selected through stratified sampling in these companies using a semi-structured questionnaire. Chi-square test and binomial logistic regression were employed to determine the relationship between the incidence of occupational injury and selected risk factors using R studio. Results: The results showed that more than a tenth (16%;n = 31) of mineworkers had sustained physical injuries since being employed—mostly lacerations (53%). Out of those injured, (85%;n = 22) reportedly sustain an injury annually. A little more than half (57%;n = 112) of the mineworkers work for more than 40 hours per week. Injuries were significantly associated with the type of profession at the mine (p = 0.04;χ2 = 4.3)—Technicians and Mechanics were more likely to be injured. Although not statistically significant, working for more than 40 hours/week doubled the odds of being injured at the workplace (aOR = 1.77;95% CI: -0.27 - 1.48). The topmost illnesses among mineworkers were musculoskeletal pains (MSPs) [53%] and headaches (35%). About two-thirds (65%) had all the needed PPEs for their work. Safety goggles were the predominant PPE reportedly lacking among the mineworkers (16%;n = 31). Conclusion: There is a need for targeted training/intervention programmes and adoption of assistive ergonomic devices to protect mineworkers.

关键词： Occupational Health Safety Gold Mining Injury Illnesses Ghana

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