Φ-φ-型压缩映象不动点的存在性

使用压缩尺度函数,在完备2-距离空间中研究一类Φ-φ-型轨道压缩映象不动点的存在与唯一性,在适当条件下证明了一个新的不动点定理,推广和改进了已知的结果.     

浅谈食品药品检验管理信息化的现状及发展方向

通过介绍食品药品检验管理信息化的概念、意义和发展历史,分析了信息化建设现状及所面临的机遇与挑战,展望了食品药品检验信息化建设的发展前景,指出了信息化建设过程中存在的主要问题,提出应加强制度和队伍建设,深入贯彻相关信息化正确理念,借鉴国外先进经验等措施,找到了今后建设的方向和重心。     

Zero-valent iron particles embedded on the mesoporous silica–carbon for chromium (VI) removal from aqueous solution

Journal of Nanoparticle Research - The demand for metal nanoparticles is increasing strongly. Transferred arc synthesis is a promising process in this respect, as it shows high production rates,...     

Three Octacyanometallate‐Based LnIII–MV (Ln = La,Ce; M = Mo,W) Bimetallic Assemblies with a One‐Dimensional Rope‐Ladder Chain Structure

Three octacyanometallate‐based hetero‐bimetallic complexes, [Ln(H₂O)₄(CH₃CN)₂][M(CN)₈] · CH₃CN [Ln = La, M = Mo( 1 ), W( 2 ); Ln = Ce, M = W( 3 )], were synthesized and characterized structurally. Single‐crystal X‐ray analysis reveals that 1 – 3 are isomorphous and consist of infinite one‐dimensional (1D) 3,3 rope‐ladder chains, in which the 12‐membered puckered square Ln₂M₂(CN)₄ is the basic building unit. The 1D chains are further linked through interchain hydrogen bonds, resulting in a three‐dimensional (3D) supramolecular network.     

Electrochemical properties of La0.8Sr0.2FeO3 − δ –La0.45Ce0.55O2 − δ composite cathodes for intermediate temperature SOFC

The electrochemical properties of La_0.8Sr_0.2FeO_3???δ (LSF)–La_0.45Ce_0.55O_2???δ (LDC) composite cathodes coated on LSGM electrolyte were studied by electrochemical impedance spectroscopy and cathodic polarization technique. Results showed that the composite cathodes possessed superior electrochemical performance compared to that of pure LSF cathode. The cathodic overpotential of Cathode C was only 100 mV at 0.3 A cm^?2, and the charge transfer resistance and the gas phase diffusion resistance were decreased to 0.105 Ω cm² and 0.257 Ω cm², respectively at 800 °C. The improvement of the electrochemical performance is contributed to the increase of the triple-phase boundary, enlargement of the effective area for electrode reaction, and increase of the porosity of the cathode by adding LDC to the cathode material.     

Orbital relaxation effects on temperature diagnostics of mid-Z plasmas

The orbital relaxation effect was studied in the calculations and diagnostics of the L-shell absorption spectra (2p→3d,4d,5d) of iron and bromine plasmas. A detailed level accounting model was developed to calculate the huge number of L-shell absorption lines of the two typical mid-Z plasmas. The orbital sets were generated by the optimizations according to the initial and final states, respectively. It was found that the L-shell line positions agree with the experimental iron and bromine spectra better when the orbital relaxations were included in calculations. Since experimental mid-Z spectra have few detailed line structures, calculations without considering orbital relaxations may misinterpret the spectra and consequently lead to underestimations of the plasma temperatures.     

Collective dynamics of genetic oscillators withcell-to-cell communication: a study case of signal integration

This paper investigates the effect of integration of intracellular and extracellular signals on collective dynamics based on a multicellular system with cell-to-cell communication. Using a mathematical model of genetic repressilators coupled to quorum sensing, we show that the changes in parameters of a certain kind of cis-regulatory input function that quantifies the signal integration can lead to the change of coupling type from phase-attractive to phase-repulsive coupling or vice versa. Consequently, the multicellular system can exhibit, in both coupling cases, different collective behaviors in terms of synchronization and clustering. We give a general method of determining coupling type, elucidate the mechanism of generating these phenomena and present a criterion for stability of cluster states, mainly by analyzing phase interaction functions.