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Tunable passively Q-switched ytterbium-doped fiber laser with mechanically exfoliated Gase saturable absorber

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Chinese Optics Letters 2018年第2期16卷 93-97页

作者： H.Ahmad s.N.Aidit s.i.ooi Z.C.Tiu Photonics Research Centre University of Malaya

A tunable passively Q-switched ytterbium-doped fiber laser using few-layer gallium selenide（Gase） as a saturable absorber（sA） is *** few-layer Gase sA,which is fabricated by the mechanical exfoliation method,is able to generate a Q-switched fiber laser that has a maximum repetition rate of 92.6 kHz and a minimum pulsed width of 2.3 μ*** highest pulse energy exhibited by the generated pulse is 18.8 nJ with a signal to noise ratio of ~40 *** tunability of the proposed laser covers from 1042 to 1082 nm,giving a tuning range of 40 nm.

关键词： Tunable passively Q-switched ytterbium-doped fiber laser with mechanically exfoliated Gase saturable absorber sA

All-fiber, wavelength-tunable ultrafast praseodymium fiber laser

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Chinese Optics Letters 2018年第12期16卷 56-60页

作者： H.Ahmad s.N.Aidit s.i.ooi Z.C.Tiu Photonics Research Centre University of Malaya Department of Physics Faculty of Science and TechnologyAirlangga University

The interest in tunable ultrafast fiber lasers operating in the 1.3 μm region has seen a significant increase due to rising demands for bandwidth as well as the zero-dispersion characteristic of silica fibers in this wavelength region. in this work, a tunable mode-locked praseodymium-doped fluoride fiber(PDFF) laser using single-walled carbon nanotubes as a saturable absorber is demonstrated. The mode-locked pulses are generated at a central wavelength of 1302 nm with a pulse repetition rate of 5.92 MHz and pulse width of 1.13 ps. The tunability of the mode-locked PDFF laser covers a tuning range of 11 nm.

关键词： All-fiber wavelength-tunable ultrafast praseodymium fiber laser sWCNTs

Mitochondrial therapeutics and mitochondrial transfer for neurodegenerative diseases and aging

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Neural Regeneration Research 2025年第3期20卷 794-796页

作者： Neville Ng Michelle Newbery Nicole Miles Lezanne ooi Molecular Horizons and school of Chemistry and Molecular Bioscience University of WollongongWollongongNSWAustralia

Mitochondrial dysfunction and neurodegeneration:Progressive neurodegenerative diseases affect a significant proportion of the population;in a single year,there are as many as 276 million disabilities and 9 million dea... 详细信息

关键词： degenerative diseases Mitochondrial

Bacteria and host: what does this mean for sepsis bottleneck?

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World Journal of Emergency Medicine 2025年第1期16卷 10-17页

作者： Azzah s Alharbi Raghad Hassan sanyi Esam i Azhar Department of Clinical Microbiology and immunology Faculty of MedicineKing Abdulaziz UniversityJeddah 21362Saudi Arabia special infectious Agent Unit King Fahad Medical Research CenterKing Abdulaziz UniversityJeddah 21362Saudi Arabia College of Health and Medical Technology Middle Technical UniversityBaghdad 10047Iraq Department of Medical Laboratory sciences Faculty of Applied Medical SciencesKing Abdulaziz UniversityJeddah 21362Saudi Arabia

BACKGROUND: sepsis is a life-threatening inflammatory condition in which the invading pathogen avoids the host's defense mechanisms and continuously stimulates and damages host cells. Consequently, many immune responses initially triggered for protection become harmful because of the failure to restore homeostasis, resulting in ongoing hyperinflammation and immunosuppression. METHODs: A literature review was conducted to address bacterial sepsis, describe advances in understanding complex immunological reactions, critically assess diagnostic approaches, and emphasize the importance of studying bacterial bottlenecks in the detection and treatment of ***: Diagnosing sepsis via a single laboratory test is not feasible;therefore, multiple key biomarkers are typically monitored, with a focus on trends rather than absolute values. The immediate interpretation of sepsis-associated clinical signs and symptoms, along with the use of specific and sensitive laboratory tests, is crucial for the survival of patients in the early stages. However, long-term mortality associated with sepsis is now recognized, and alongside the progression of this condition, there is an in vivo selection of adapted ***: Bacterial sepsis remains a significant cause of mortality across all ages and societies. While substantial progress has been made in understanding the immunological mechanisms underlying the inflammatory response, there is growing recognition that the ongoing host-pathogen interactions, including the emergence of adapted virulent strains, shape both the acute and long-term outcomes in sepsis. This underscores the urgent need for novel high-throughput diagnostic methods and a shift toward more pre-emptive, rather than reactive, treatment strategies in sepsis care.

关键词： sepsis Bacteria Bottleneck inflammation

Viscosity, NMR Diffusometry and Light scattering Data for Aqueous and Aqueous-salt solutions of Poly(1-butyl-3-vinylimidazolium bromide)

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CHiNEsE JOURNAL OF POLYMER sCiENCE 2025年第2期43卷 380-391页

作者： Korchak, Petr A. Yarchenko, Polina s. safonova, Evgenia A. Koneva, Alina s. Victorov, Alexey i. st Petersburg state Univ St Petersburg 199034 Russia

Poly(1-butyl-3-vinylimidazolium bromide) is a polymerized ionic liquid (PiLs), a relatively new class of materials that combines the attractive properties of ionic liquids (iLs) and polyelectrolytes and finds wide applications. The backbone of this PiL is composed of quaternary imidazolium salts, which are among the most promising and popular iLs. However, little is known about the physicochemical characteristics of the aqueous solutions of this PiL. in this study, we synthesized and characterized samples of this PiL and obtained experimental data on the viscosity, static and dynamic light scattering, and nuclear magnetic resonance diffusometry for aqueous and aqueous KBr solutions with varying polymer contents at T=298.15 K. We discuss the effects of the polymer concentration and salinity on the behavior of the solution.

关键词： Polymerized ionic liquid Polyelectrolyte solutions Viscosity Light scattering NMR diffusometry

Creation of an oxygen-enriched environment during synthesis as an effective way to improve luminescent properties of Y_(2)O_(3):Eu^(3+)

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Journal of Rare Earths 2025年第1期43卷 21-29,I0001页

作者： Aleksandr A.Nashivochnikov Anton i.Kostyukov Mariana i.Rakhmanova Lidiya s.Kibis svetlana V.Cherepanova Evgenii A.suprun Novosibirsk state University Pirogova Str.2630090NovosibirskRussia Boreskov institute of Catalysis sB RAs 5 Lavrentiev Ave630090NovosibirskRussia Nikolaev institute of inorganic Chemistry sB RAs 3 Lavrentiev Ave630090NovosibirskRussia

The growing demand for luminescent nanomaterials intended for various applications increases the necessity to develop and improve approaches to the creation of highly efficient nanosized *** current study,an approach to enhancing the efficiency of red luminescence of monoclinic Y_(2)O_(3):Eu^(3+)with the particle size of~20 nm by creating the oxygen-enriched environment during the gas-phase synthesis was *** investigate the effect of oxygen amount during the synthesis on characteristics of the phosphor,a series of nano structured Y_(2)O_(3):Eu^(3+)with the addition of 0-40 vol%O_(2) to the main buffer gas Ar was synthesized by laser *** is shown that the amount of added O_(2) exerts virtually no effect on the phase composition and particle size,but significantly improves the luminescent characteristics of Y_(2)O_(3):Eu^(3+).Thus,the addition of 30 vol%O_(2) leads to virtually a 20-fold growth in the photoluminescence(PL)intensity caused by ^(5)D_(0)→^(7)F_(0-4) transitions in Eu^(3+)and an increase in the absolute PL quantum yield from 3%to 53%(λex=395 nm)compared to the sample synthesized without O_(2).The addition of oxygen also improves the emission color coordinates from(0.571,0.320)to(0.630,0.322)due to the removal of a considerable fraction of oxygen *** synthesized nanopowders are shown to be highly stable:upon storage under ambient conditions for two *** yield(QY)of the samples decreases by less than 2%.it is expected that the key features underlying the proposed approach will be useful for various methods used to synthesize oxide nanophosphors.

关键词： Photoluminescence Quantum yield Laservaporization Y_(2)0_(3):Eu^(3+) Monoclinic Y_(2)0_(3) Rareearths

Modeling net-charge fluctuations in heavy-ion collisions at the LHC

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Chinese Physics C 2025年第1期49卷 281-289页

作者： G.O.Ambaryan A.s.Chernyshov G.Kh.Eyyubova V.L.Korotkikh i.P.Lokhtin s.V.Petrushanko A.M.snigirev E.E.Zabrodin Physics Department Lomonosov Moscow State UniversityRU-119991 MoscowRussia skobeltsyn institute of Nuclear Physics Lomonosov Moscow State UniversityRU-119991 MoscowRussia Bogoliubov Laboratory of Theoretical Physics Joint Institute for Nuclear ResearchRU-141980 DubnaRussia Department of Physics University of OsloN-0316 OsloNorway

Analysis of Pb+Pb data for net-charge fluctuations at LHC energies using the HYDJET++model is *** strongly intensive quantities D and Σ were used to remove the effects related to system volume *** employed two versions of HYDJET++for the *** first one is the standard or default version,whereas the second one is a modification that takes into account explicit event-by-event conservation of the electric net-charge of produced *** inclusion of the canonical net-charge conservation in the model allows for better description of the experimental data obtained by the ALiCE and CMs Collaborations.A comparison with calculations from other models is also presented.

关键词： relativistic heavy-ion collisions net-charge fluctuations strongly intensive variables canonical charge conservation

iron-promoted zirconia-alumina supported Ni catalyst for highly efficient and cost-effective hydrogen production via dry reforming of methane

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Journal of Environmental sciences 2025年第2期148卷 274-282页

作者： Ahmed s.Al-Fatesh Naitik Patel Vijay Kumar srivastava Ahmed i.Osman David W.Rooney Anis H.Fakeeha Ahmed E.Abasaeed Mohammed F.Alotibi Rawesh Kumar Chemical Engineering Department College of EngineeringKing Saud UniversityP.O.Box 800Riyadh 11421Saudi Arabia Department of Chemistry Indus UniversityAhmedabadGujarat 382115India school of Chemistry and Chemical Engineering Queen’s University BelfastBelfast BT95AGNorthern IrelandUK institute of Refining and Petrochemicals Technologies King Abdulaziz City for Science and Technology(KACST)P.O.Box 6086Riyadh 11442Kingdom of Saudi Arabia

Developing cost-effective and high-performance catalyst systems for dry reforming of methane(DRM)is crucial for producing hydrogen(H_(2))***,we investigate using iron(Fe)as a promoter and major alumina support in Ni-based catalysts to improve their DRM *** addition of iron as a promotor was found to add reducible iron species along with reducible NiO species,enhance the basicity and induce the deposition of oxidizable *** incorporating 1 wt.%Fe into a 5Ni/10ZrAl catalyst,a higher CO_(2) interaction and formation of reducible"NiO-species having strong interaction with support"was observed,which led to an∼80%H_(2) yield in 420 min of Time on stream(TOs).Further increasing the Fe content to 2 wt.%led to the formation of additional reducible iron oxide species and a noticeable rise in H_(2) yield up to 84%.Despite the severe weight loss on Fe-promoted catalysts,high H_(2) yield was maintained due to the proper balance between the rate of CH_(4) decomposition and the rate of carbon deposit ***,incorporating 3 wt.%Fe into the 5Ni/10ZrAl catalyst resulted in the highest CO_(2) interaction,wide presence of reducible NiO-species,minimumgraphitic deposit and an 87%H_(2) *** findings suggest that ironpromoted zirconia-alumina-supported Ni catalysts can be a cheap and excellent catalytic system for H_(2) production via DRM.

关键词： Dry reforming of methane Coke resistant Hydrogen production Cheap catalyst Fe-promoted catalyst

Vegetation dynamics at the southern edge of the siberian mountain taiga

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Journal of Mountain science 2025年第2期22卷 451-465页

作者： iM sergei T KHARUK Viacheslav i PETROV il'ya A sHUsHPANOV Alexander s DViNsKAYA Maria L ONDAR sergei O V.N.sukachev institute of Forest Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of ScienceKrasnoyarsk 660036Russia institute of Ecology and Geography Institute of Space and Information TechnologiesSiberian Federal UniversityKrasnoyarsk 660041Russia Laboratory of Biodiversity and Ecology Tomsk State UniversityTomsk 634050Russia institute of space Research and High Technologies Reshetnev Siberian State University of Science and TechnologyKrasnoyarsk 660014Russia Department of Biology and Ecology Tuvan State UniversityKyzyl 667000Russia

The growth,survival,and mortality of conifer species in response to the hydrothermal regime have received considerable *** is expected that the highest sensitivity of trees to the warming-drying climate will occur mainly at the edges of the species *** focused on the responses to climate change of the drought-resistant larch(Larix sibirica)and the moisture-sensitive siberian pine(Pinus sibirica)along the elevation gradient in the Tannu-Ola Ridge,the southern margin where those two species coexist in siberia by using satellite data(MODis,Landsat,and microwave),the indexes of gross(GPP)and net(NPP)primary productivity,and tree radial growth index(Gi).We found that since the warming restart in the 2000s,the area of larch-dominated forests increased by~150%while the area of pine-dominated forests decreased by~10%.The siberian pine has retreated at low elevations(increased its area at higher *** contrast,the area of larch stands increased in both the uphill and downhill ***(Betula spp.)also increased its area at low elevations(about+120%).since 2001,the forested area increased by~5%.A shrubification,i.e.,an increase in the area of shrubs,was observed at high *** uphill rate of timberline and shrubline migration was about 0.3 m/*** the 2000s,vegetation NPP has increased by 13%.A notable correlation between NPP and the Gi of larch and pine was found(r=0.5-0.7).At lower elevations,NPP positively correlated with precipitation and soil moisture,while air temperature and VPD(vapor pressure deficit)increase inhibited *** high elevations,the effects of these variables on productivity *** continuous decline of the siberian pine forest indicates an inevitable retreat of this species at low elevations and its replacement by larch and birch.

关键词： Trees range changes Mountain taiga siberian larch siberian pine Timberline shrubification Tree uphill migration Forest population dynamics Ecological resilience Habitat suitability