534,762 research outputs found
Wang Li (1900-1986)
No full textWang Li (Wang Liaoyi) was one of the three most prominent linguists in China in the 20th century. He was born August 10, 1900, in what is now Bobai County of the Guangxi Zhuang Autonomous Area
[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
Structural Changes in Li2MnO3 Cathode Material for Li-Ion Batteries
No full textStructural changes in Li2MnO3 cathode material for rechargeable Li-ion batteries are investigated during the first and 33 rd cycles. It is found that both the participation of oxygen anions in redox processes and Li+-H+ exchange play an important role in the electrochemistry of Li2MnO3. During activation, oxygen removal from the material along with Li gives rise to the formation of a layered MnO2-type structure, while the presence of protons in the interslab region, as a result of electrolyte oxidation and Li+-H+ exchange, alters the stacking sequence of oxygen layers. Li re-insertion by exchanging already present protons reverts the stacking sequence of oxygen layers. The re-lithiated structure closely resembles the parent Li2MnO3, except that it contains less Li and O. Mn4+ ions remain electrochemically inactive at all times. Irreversible oxygen release occurs only during activation of the material in the first cycle. During subsequent cycles, electrochemical processes seem to involve unusual redox processes of oxygen anions of active material along with the repetitive, irreversible oxidation of electrolyte species. The deteriorating electrochemical performance of Li2MnO3 upon cycling is attributed to the structural degradation caused by repetitive shearing of oxygen layers. Structural changes in Li2MnO3 provide evidence for the unusual electrochemical processes such as Li+-H+ exchange and the participation of oxygen anions in redox reactions. The observed decline in the electrochemical performance of the material upon cycling, mainly attributed to the Li+-H+ exchange and associated structural changes, also provides a global explanation for the reported cycling behavior of Li2MnO3-containing Li-rich cathode materials. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Li et al J Cell. Physio. original data supp
No full textLi et al J Cell. Physio. original data supp<br
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
Full text linkFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Study on the Mg-Li-Zn ternary alloy system with improved mechanical properties, good degradation performance and different responses to cells
No full textNovel Mg-(3.5, 6.5wt%)Li-(0.5, 2, 4wt%)Zn ternary alloys were developed as new kinds of biodegradable metallic materials with potential for stent application. Their mechanical properties, degradation behavior, cytocompatibility and hemocompatibility were studied. These potential biomaterials showed higher ultimate tensile strength than previously reported binary Mg-Li alloys and ternary Mg-Li-X (X=Al, Y, Ce, Sc, Mn and Ag) alloys. Among the alloys studied, the Mg-3.5Li-2Zn and Mg-6.5Li-2Zn alloys exhibited comparable corrosion resistance in Hank's solution to pure magnesium and better corrosion resistance in a cell culture medium than pure magnesium. Corrosion products observed on the corroded surface were composed of Mg(OH)2, MgCO3 and Ca-free Mg/P inorganics and Ca/P inorganics. In vitro cytotoxicity assay revealed different behaviors of Human Umbilical Vein Endothelial Cells (HUVECs) and Human Aorta Vascular Smooth Muscle Cells (VSMCs) to material extracts. HUVECs showed increasing nitric oxide (NO) release and tolerable toxicity, whereas VSMCs exhibited limited decreasing viability with time. Platelet adhesion, hemolysis and coagulation tests of these Mg-Li-Zn alloys showed different degrees of activation behavior, in which the hemolysis of the Mg-3.5Li-2Zn alloy was lower than 5%. These results indicated the potential of the Mg-Li-Zn alloys as good candidate materials for cardiovascular stent applications. Statement of significance: Mg-Li alloys are promising as absorbable metallic biomaterials, which however have not received significant attention since the low strength, controversial corrosion performance and the doubts in Li toxicity. The Mg-Li-Zn alloy in the present study revealed much improved mechanical properties higher than most reported binary Mg-Li and ternary Mg-Li-X alloys, with superior corrosion resistance in cell culture media. Surprisingly, the addition of Li and Zn showed increased nitric oxide release. The present study indicates good potential of Mg-Li-Zn alloy as absorbable cardiovascular stent material.Accepted Author ManuscriptBiomaterials & Tissue Biomechanic
FIGURE 3. J.-K. Li in First species of Ctenisomorphus Raffray, 1890 from China, with comments on Largeyeus J.-K. Li, 1993 (Coleoptera, Staphylinidae, Pselaphinae)
No full textFIGURE 3. J.-K. Li (1993)'s original description and figures, with captions translated to English.Published as part of Li, Qi-Qi, Wang, Yan & Yin, Zi-Wei, 2021, First species of Ctenisomorphus Raffray, 1890 from China, with comments on Largeyeus J.-K. Li, 1993 (Coleoptera, Staphylinidae, Pselaphinae), pp. 588-596 in Zootaxa 5016 (4) on page 592, DOI: 10.11646/zootaxa.5016.4.9, http://zenodo.org/record/522268
Didymocarpus heucherifolius var. yinzhengii J. M. Li & S. J. Li 2014, var. nov.
No full textDidymocarpus heucherifolius var. yinzhengii J.M. Li & S. J. Li, var. nov. (Fig.1 A–E & Fig.2 A–C) Affinis D. heucherifolio, a quo floribus majusculis (ad 4 lin. longis), corollis extus glabris, intus basin pilosis, staminodiis absentibus. Type: ― CHINA. Hunan: near Yongxing county. alt. 300m, 26°17' 10''N, 113°11'25''E, 6 May 2011, Jia-Mei Li 1105062 (holotype HEAC!); ibid. Jia-Mei Li 11501 (paratype IBK!). Perennial herbs acaulescent; Rhizome horizontal, up to 1.5cm thick, 3–4cm long, roots fibrous; Leaves papery, clustered at the apex of the rhizome, apparently whorled, orbicular, up to 5.5× 7.2 cm, base cordate, apex rounded, margin irregularly triangular denticulate, lateral veins 3–4 on each side of midrib, palmate, the upper surface with dense eglandular short hairs and sparsely long hairs, lower surface with sparse short hairs and sparse long hairs confined to the veins; petiole 2–8 cm, with long fuscous hairs; Cymes scapiform, up to 4 on a stem, each 4-many flowered; peduncle up to 15 cm, spreading villous; Bracts free, elliptic, 9–15 mm, serrate, long ciliate; Pedicel up to 2.5 cm, with densely eglandular hairs; Calyx divided to the base, ca. 10–12 mm, 5-lobed, lobes unequal, oblong-oblanceolate-linear, 10–12 mm × 1.8–2.2 mm, 1–3 sparse denticulate teeth on each side, puberulent outside, glabrous inside; Corolla pink, up to 4 cm, glabrous outside, puberulent inside at the base, tube funnelform-tubular, up to 3 cm long; Filaments 10–12 mm, glandular; anthers up to 3 mm, puberulent; Staminodes absent; Pistil up to 3 cm, pilose to puberulent; stigma capitate, ovary ca. 1.6 cm, puberulent; Capsule up to 9 cm. Ecology, Phenology and Etymology:— The new variety has so far been found only on a slope of Danxia region near Yongxing county. Population size of the new species requires assessment, but at least 500 plants were seen by us at the type location. It flowers in April to May a little earlier than D. heucherifolius var. heucherifolius. The specific epithet of this new species is named to honor Dr. Yinzheng Wang, fellow of State Key Laboratory of Systematic and Evolutionary Botany, Chinese Academy of Sciences, in recognition of his contribution to our knowledge of the family Gesneriaceae, particularly in Tribe Didymocarpeae Endl. (1839:716). His research interests include the evolution of floral symmetry in Gesneriaceae and phylogenetics of Tribe Didymocarpeae.Published as part of Li, Jia-Mei & Li, Shi-Jin, 2014, Didymocarpus heucherifolius var. yinzhengii (Gesneriaceae), a new taxon from Hunan, China, pp. 187-190 in Phytotaxa 156 (3) on pages 187-189, DOI: 10.11646/phytotaxa.156.3.10, http://zenodo.org/record/512794
Studies on storage characteristics of Li Ni0.4 Co0.2 Mn0.4 O2 as cathode materials in lithium-ion batteries
No full textLi Ni0.4 Co0.2 Mn0.4 O2 prepared by mixed-hydroxide method has shown excellent electrochemical performance and storage stability as a cathode material in lithium-ion batteries. The changes of the crystal structure, oxygen species on the surface, and oxidation state of transition metals of the samples under various storing conditions were examined by X-ray diffraction, iodometric titration, X-ray photoelectron spectroscopy, and the depth-profile experiments. It was found that the surface reaction between samples and C O2 H2 O was so negligible that it could not affect the electrochemical performance of the material. But if storing the material in Ar-filled glove box, the oxygen might release from the surface, and, consequently, Mn and Co ions could decrease their oxidation state, take part in the electrode reaction, and then dissolve into electrolyte during the cycling process. The regular ion arrangement on the surface of the materials might be destroyed. Thus cyclic performance of the samples stored in Ar is poorer than that for samples stored in other conditions. © 2007 The Electrochemical Society
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