72,966 research outputs found
Li3PO4-added garnet-type Li6.5La3Zr1.5Ta0.5O12 for Li-dendrite suppression
No full text
This paper proposes a strategy to stabilize the garnet/Li interface by introducing Li3PO4 as an additive in garnet-type Li6.5La3Zr1.5Ta0.5O12. The Li3PO4-added Li6.5La3Zr1.5Ta0.5O12 electrolyte exhibits a room temperature Li-ion conductivity of 1.4 x 10(-4) S cm(-1), which is less than that of the Li3PO4-free counterparts (4.6 x 10(-4) S cm(-1)). However, the presence of Li3PO4 improves the interfacial compatibility and suppresses Li-dendrite formation during Li-metal plating/stripping. The symmetric Li/garnet/Li cells with Li3PO4-added Li6.3La3Zr1.5Ta0.5O12 have been successfully cycled at a current density of 0.1 mA cm(-2) at 60 degrees C for 60 h; on contrast, the control cells with Li3PO4-free Li6.5La3Zr1.5Ta0.5O12 display noisy potential with large voltage polarization and get short-circuited completely after 33-h cycling under the same operating condition. The outstanding interface stability can be attributed to the in situ reaction of the Li flux with Li3PO4 to form a self-limiting and ion-conducting interphase, Li3P, which is confirmed experimentally. (C) 2017 Elsevier B.V. All rights reserved.</p
Constraining structure formation using EDGES
Full text linkThe experiment to detect the global epoch of reionization signature (EDGES) collaboration reported the detection of a line at 78 MHz in the sky-averaged spectrum due to neutral hydrogen (HI) 21-cm hyperfine absorption of cosmic microwave background (CMB) photons at redshift z similar to 17. This requires that the spin temperature of HI be coupled to the kinetic temperature of the gas at this redshift through the scattering of Lyman-alpha photons emitted by massive stars. To explain the experimental result, star formation needs to be sufficiently efficient at z similar to 17 and this can be used to constrain models in which small-scale structure formation is suppressed (DMF models), either due to dark matter free-streaming or non-standard inflationary dynamics. We combine simulations of structure formation with a simple recipe for star formation to investigate whether these models emit enough Lyman-alpha photons to reproduce the experimental signal for reasonable values of the star formation efficiency, f(*). We find that a thermal warm dark matter (WDM) model with mass m(WDM) 4.3 keV is consistent with the timing of the signal for f(*). less than or similar to 2%. The exponential growth of structure around z similar to 17 in such a model naturally generates a sharp onset of the absorption. A warmer model with 1 m(WDM) similar to 3 keV requires a higher star formation efficiency, f(*) similar to 6%, which is a factor of few above predictions of current star formation models and observations of satellites in the Milky Way. However, uncertainties in the process of star formation at these redshifts do not allow to derive strong constrains on such models using 21-cm absorption line. The onset of the 21-cm absorption is generally slower in DMF than observed in cold dark matter (CDM) models, unless some process significantly suppresses star formation in halos with masses below similar to 10(8) h(-1) M-circle dot
The influence of bolus volume, temperature, and viscosity to swallowing function evaluated by a self-designed phagometer: A preliminary study.
No full textFaecal DNA typing to determine the abundance and spatial organisation of otters (Lutra lutra) along two stream systems in Kinmen.
No full textReorganization of the cortico-spinal pathway in patients with chronic complete thoracic spinal cord injury: a study of motor evoked potentials.
No full textLi-Ion Conduction and Stability of Perovskite Li<sub>3/8</sub>Sr<sub>7/16</sub>Hf<sub>1/4</sub>Ta<sub>3/4</sub>O<sub>3</sub>
No full textA solid
Li-ion conductor with a high room temperature Li-ion conductivity
and small interfacial resistance is required for its application in
next-generation Li-ion batteries. Here, we prepared a cubic perovskite-related
oxide with the general formula Li3/8Sr7/16Hf1/4Ta3/4O3 (LSHT) by a conventional solid-state
reaction method, which was studied by X-ray diffraction, electrochemical
impedance spectroscopy, and 7Li MAS NMR. Li3/8Sr7/16Hf1/4Ta3/4O3 has
a high Li-ion conductivity of 3.8 × 10–4 S
cm–1 at 25 °C and a low activation energy of
0.36 eV in the temperature range 298–430 K. It exhibits both
high stability and small interfacial resistance with commercial organic
liquid electrolytes, which makes it promising as a separator in Li-ion
batteries
[Ying jin 籝 金 par Li Ruo li 李 若 立.]
No full textLi Ruo qiu 李 若 丘. Li Ruo li 李 若 立. Ying jin 籝 金. Ouvrages de caractère encyclopédiqueNumérisation effectuée à partir d'un document original.Encyclopédie. Déb. et fin manquent. Pian [17, She ji 社 稷, fin seulement et] 18, Zhong jian 忠 諫, déb. seulement. Pour d'autres fragments de ce texte, cf. notamment S. 2053 verso, 5604 et les Pelliot chinois 2966 et Pelliot chinois 3363. Le nom de l'auteur est parfois lu Li Ruo qiu 丘. Écr. kai à tendance xing. Encre foncée. Notes sur col. dédoublées. 16 col., 8 col. simples par page, 14 ou 15 car. par col. Marges sup. 1 cm, inf. 0,5 cm
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
Tailoring Li6PS5BR ionic conductivity and understanding of its role in cathode mixtures for high performance all-solid-state Li-S batteries
No full textThe ultrafast ionic conductivity of Li 6 PS 5 Br, which is higher than 1 mS cm -1 at room temperature, makes it an attractive candidate electrolyte for the all-solid-state Li-S battery. A simple synthesis route with an easy scale up process is critical for practical applications. In this work, the highest room temperature ionic conductivity (2.58 × 10 -3 S cm -1 ) of Li 6 PS 5 Br is obtained by an optimal annealing temperature in a simple solid-state reaction method. Neutron diffraction and XRD show that the origin of the highest ionic conductivity is due to the higher purity, smaller mean lithium ion jumps and the optimal Br ordering over 4a and 4c sites. All-solid-state Li-S batteries using a S-C composite cathode in combination with the optimized Li 6 PS 5 Br electrolyte and Li-In anode show high (dis)charge capacities. Different cycling modes (charge-discharge and discharge-charge) reveal that the capacity of the S-C-Li 6 PS 5 Br/Li 6 PS 5 Br/Li-In battery arises from both the active S-C composite and the Li 6 PS 5 Br in the cathode mixture. The contribution of the latter is verified from all-solid-state batteries using Li 6 PS 5 Br and its analogues as active materials. Ex situ XRD and electrochemical performance results show that the contribution of capacity from Li 6 PS 5 Br in the cathode mixture may be associated with the decomposition product Li 2 S, while the Li 6 PS 5 Br in the bulk solid electrolyte layer is stable during cycling. Accepted Author ManuscriptRST/Storage of Electrochemical EnergyRST/Neutron and Positron Methods in Material
Electron mobility in surface- and buried- channel flatband In<sub>0.53</sub>Ga<sub>0.47</sub>As MOSFETs with ALD Al<sub>2</sub>O<sub>3</sub> gate dielectric.
Full text linkIn this paper, we investigate the scaling potential of flatband III-V MOSFETs by comparing the mobility of surface and buried In<sub>0.53</sub>Ga<sub>0.47</sub>As channel devices employing an Atomic Layer Deposited (ALD) Al<sub>2</sub>O<sub>3</sub> gate dielectric and a delta-doped InGaAs/InAlAs/InP heterostructure.
Peak electron mobilities of 4300 cm<sup>2</sup>/V·s and 6600 cm<sup>2</sup>/V·s at a carrier density of 3×1012 cm<sup>-2</sup> for the surface and buried channel structures respectively were determined. In contrast to similarly scaled inversion-channel devices, we find that mobility in surface channel flatband structures does not drop rapidly with electron density, but rather high mobility is maintained up to carrier concentrations around 4x10<sup>12</sup> cm<sup>-2</sup> before slowly dropping to around 2000 cm<sup>2</sup>/V·s at 1x10M<sup>13</sup> cm<sup>-2</sup>. We believe these to be world leading metrics for this material system and an important development in informing the III-V MOSFET device architecture selection process for future low power, highly scaled CM
- …
