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Microstructures made in optical fiber with femtosecond laser

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International Journal of Smart and Nano Materials 2010年第4期1卷 237-248页

作者： Kaiming Zhou Lin Zhang Xianfeng Chen Vladimir mezentsev Ian Bennion Photonic Research Group Aston UniversityBirminghamB47ETUnited Kingdom

Different types of microstructures including microchannels and microslots were made in optical fibers using femtosecond laser inscription and chemical *** with UV-inscribed fiber Bragg gratings,these microstructures have miniature,robustness and high sensitivity features and have been used to implement novel devices for various sensing *** fiber microchannels were used to detect the refractive index change of liquid presenting sensitivities up to 7.4 nm/refractive index unit(RIU)and 166.7 dB/RIU based on wavelength and power detection,respectively.A microslot-in-fiber based liquid core waveguide as a refractometer has been proposed and the device was used to measure refractive index,and a sensitivity up to 945 nm/RIU(10−6/pm)was *** filling epoxy in the microslot and subsequent UV light curing,a hybrid waveguide grating structure with polymer core and glass cladding was *** obtained device was highly thermal responsive,demonstrating a linear coefficient of 211 pm/◦C.

关键词： ultrafast laser optical fiber fiber Bragg grating

The Minimax Equality; Sufficient and Necessary Conditions

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Acta Mathematica Sinica,English Series 2007年第4期23卷 677-684页

作者： anton STEFANESCU University of Bucharest Faculty of Mathematics14 Academiei St010014 BucharestRomania

The paper produces new versions of the minimax theorem based on original conditions. Moreover, we investigate not only the sufficiency, but also the necessity of such conditions. The proofs are very simple and preclud... 详细信息

关键词： Minimax equality Convexlike functions Affine-connectedness

Lefschetz Formulae for p-Adic Groups

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Chinese Annals of Mathematics,Series B 2007年第4期28卷 463-474页

作者： anton DEITMAR Mathematisches Institut Auf der Morgenstelle 10 72076 TübingenGermany.

In this paper, Lefschetz formulae for torus actions on p-adic groups are proven. These are similar to comparable formulae for real Lie groups. Applications lie in the realm of dynamical zeta functions.

关键词： Arithmetic groups Trace formula Lefschetz formula

Change in carbonate budget and composition during subduction below metal saturation boundary

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Geoscience Frontiers 2023年第1期14卷 79-100页

作者： anton Shatskiy anton V.Arefiev Konstantin D.Litasov Vernadsky Institute of Geochemistry and Analytical Chemistry Russian Academy of SciencesMoscow 119991Russia Vereshchagin Institute for High Pressure Physics Russian Academy of SciencesTroitskMoscow 108840Russia

It is generally accepted that carbonates can be subducted to the mantle depths,where they are reduced with iron metal to produce a *** this work,we found that this is not always the *** mantle carbonates from inclusions in diamonds show a wide range of cation compositions(Mg,Fe,Ca,Na,and K).Here we studied the reaction kinetics of these carbonates with iron metal at 6-6.5 GPa and 1000-1500℃.We found that the reduction of carbonate with Fe produces C-bearing species(Fe,Fe-C melt,Fe_(3)C,F e_(7)C_(3),C)and wüistite containing Na_(2)O,CaO,and *** reaction rate constants(k=△x^(2)/2t)are log-linear relative to 1/T and their temperature dependences are determined to be k_(MgcO_(3))(m^(2)/s)=4.37×10^(-3)exp[-251(kJ/mol)/RT]k_(caMg(CO_(3))2)(m^(2)/s)=1.48×10^(-3)exp[-264(kJ/mol)/RT]k_(cacO_(3))(m^(2)/s)=3.06×10^(-5)exp[-245(kJ/mol)/RT]and k_(Na_(2)cO_(3))(m^(2)/s)=1.88×10^(-10)exp[-155(kJ/mol)/RT].According to obtained results at least,45-70 vol%of carbonates preserve during subduction down to the 660-km discontinuity if no melting *** slab stagnation and warming,subsequent carbonate melting,and infiltration into the mantle saturated with iron metal are accompanied by a reduction of carbonate melt with *** established sequence of reactivity of carbonates:FeCO_(3)≥MgCO_(3)>CaMg(CO_(3))2>CaCO_(3)>>Na_(2)CO_(3),where K_(2)CO_(3)does not react at all with iron metal,implies that during reduction carbonate melt with Fe evolves toward *** above conclusions are consistent with the findings of carbonates in inclusions in diamonds from the lower mantle and high concentrations of alkalis,particularly K,in mantle carbonatite melts entrapped by diamonds from kimberlites and placers worldwide.

关键词： Carbonate Reduction of carbonate with Fe Reaction kinetics Carbonatite melt High-pressure experiment Earth's mantle

Investigating Energy Prosumer Behaviour in Crowd Energy Using an Interactive Model/Diorama

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Journal of Electronic Science and Technology 2018年第4期16卷 341-350页

作者： Christian Ritzel anton Sentic the international institute of management in technology University of Fribourg Fribourg 1700Switzerland

Smart living labs such as the one located in Fribourg(Switzerland) focus on improving wellbeing and furthering knowledge related to building the district of the future on a technical and social level. Therefore, smart living labs represent an experimental platform/space where sustainable production and consumption strategies can be tested in a protected environment. A significant change in the socioeconomic production and consumption sphere can be expected by the rise of the so-called energy prosumer. Accordingly, this article presents an interactive model for the experimental investigation of energy prosumer behavior. In this context, two potential experiments on investment and trade decisions are briefly outlined. Since(behavioral and economic) experiments are usually conducted under controlled conditions in experimental labs involving mainly undergraduate students, the presented interactive model is flexible and mobile, providing the advantage to conduct experiments nearly everywhere involving everyday citizens.

关键词： Crowd energy decentralised energy systems experiments prosumers smart grid

EXPONENTIAL INTEGRATORS FOR STOCHASTIC SCHRODINGER EQUATIONS DRIVEN BY ITO NOISE

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Journal of Computational Mathematics 2018年第2期36卷 276-309页

作者： Rikard anton David Cohen Department of Mathematics and Mathematical Statistics Umea University SE-901 87 Umea Sweden Department of Mathematics University of Innsbruck A 6020 Innsbruck Austria

We study an explicit exponential scheme for the time discretisation of stochastic SchrS- dinger Equations Driven by additive or Multiplicative It6 Noise. The numerical scheme is shown to converge with strong order 1 if the noise is additive and with strong order 1/2 for multiplicative noise. In addition, if the noise is additive, we show that the exact solutions of the linear stochastic Sehr6dinger equations satisfy trace formulas for the expected mass, energy, and momentum （i. e., linear drifts in these quantities）. Furthermore, we inspect the behaviour of the numerical solutions with respect to these trace formulas. Several numerical simulations are presented and confirm our theoretical results.

关键词： Stochastic partial differential equations Stochastic SchrSdinger equations,Numerical methods Geometric numerical integration Stochastic exponential integrators,Strong convergence Trace formulas.

Drosophila melanogaster brain invasion pathogenic Wolbachia in central nervous system of the fly

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Insect Science 2016年第2期23卷 253-264页

作者： anton Strunov Elena Kiseleva Institute of Cytology and Genetics Siberian Branch of the Russian Academy of Sciences Prospekt Lavrentyeva 10 Novosibirsk 630090Russia

The pathogenic Wolbachia strain wMelPop rapidly over-replicates in the brain, muscles, and retina of Drosophila melanogaster, causing severe tissue degeneration and premature death of the host. The unique features of this endosymbiont make it an excellent tool to be used for biological control of insects, pests, and vectors of human diseases. To follow the dynamics of bacterial morphology and titer in the nerve cells we used transmission electron microscopy of 3-d-old female brains. The neurons and glial cells from central brain of the fly had different Wolbachia titers ranging from single bacteria to large accumulations, tearing cell apart and invading extracellular space. The neuropile regions of the brain were free of wMelPop. Wolbaehia tightly interacted with host cell organelles and underwent several morphological changes in nerve cells. Based on different morphological types of bacteria described we propose for the first time a scheme of wMelPop dynamics within the somatic tissue of the host.

关键词： bacterial morphology dynamics brain Drosophila melanogaster electronmicroscopy pathogenic endosymbiont Wolbachia strain wMelPop

Trajectory correction for lunar flyby transfers to libration point orbits using continuous thrust

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Astrodynamics 2022年第3期6卷 285-300页

作者： Yi Qi anton de Ruiter School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Department of Aerospace Engineering Ryerson UniversityTorontoON M5B 2K3Canada

Trajectory corrections for lunar flyby transfers to Sun–Earth/Moon libration point orbits(LPOs)with continuous thrusts are investigated using an ephemeris *** lunar flyby transfer has special geometrical and dynamical structures;therefore,its trajectory correction strategy is considerably different from that of previous studies and should be specifically *** this paper,we first propose a control strategy based on the backstepping technique with a dead-band scheme using an ephemeris *** initial error caused by the launch time error is *** the perturbed transfers significantly diverge from the reference transfers after the spacecraft passes by the Moon,we adopt two sets of control parameters in two portions before and after the lunar flyby,***,practical constraints owing to the navigation and propellant systems are introduced in the dynamical model of the trajectory *** a prograde type 2 orbit as an example,numerical simulations show that our control strategy can efficiently address trajectory corrections for lunar flyby transfers with different practical *** addition,we analyze the effects of the navigation intervals and dead-band scheme on trajectory ***,trajectory corrections for different lunar flyby transfers are depicted and compared.

关键词： libration point orbit trajectory correction Earth-Moon system continuous thrust backstepping technique

Analyzing the energy intensity and greenhouse gas emission of Canadian oil sands crude upgrading through process modeling and simulation

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Frontiers of Chemical Science and Engineering 2014年第2期8卷 212-218页

作者： anton ALVAREZ-MAJMUTOV Jinwen CHEN Natural Resources Canada CanmetENERGY One Oil Patch Drive Devon AB T9G 1A8 Canada

This paper presents an evaluation of the energy intensity and related greenhouse gas/CO2 emissions of integrated oil sands crude upgrading processes. Two major oil sands crude upgrading schemes currently used in Canadian oil sands operations were investigated： cokingbased and hydroconversion-based. The analysis, which was based on a robust process model of the entire process, was constructed in Aspen HYSYS and calibrated with representative data. Simulations were conducted for the two upgrading schemes in order to generate a detailed inventory of the required energy and utility inputs： process fuel, steam, hydrogen and power. It was concluded that while hydroconversion-based scheme yields considerably higher amount of synthetic crude oil （SCO） than the cokerbased scheme （94 wt-% vs. 76 wt-%）, it consumes more energy and is therefore more CO2-intensive （413.2kg CO2/m3sco vs. 216.4kg CO2/m^3sco）. This substantial difference results from the large amount of hydrogen consumed in the ebullated-bed hydroconverter in the hydroconversion-based scheme, as hydrogen production through conventional methane steam reforming is highly energy-intensive and therefore the major source of CO2 emission. Further simulations indicated that optimization of hydroconverter operating variables had only a minor effect on the overall CO2 emission due to the complex trade-off effect between energy inputs.

关键词： Oil sands crude upgrading hydroconversion,process modeling greenhouse gas emissions