نتایج جستجو برای: li and na
تعداد نتایج: 17036294 فیلتر نتایج به سال:
The cation selectivity of the Na entry mechanism located in the outer membrane of the bullfrog (Rana catesbeiana) skin epithelium was studied. This selectivity was determined by measuring the short-circuit current when all of the external sodium was replaced by another cation and, also, by noting the relative degree of inhibition that the alkali metal cations produced on Na influx. The ability ...
We describe the design of a single beam, multiple species atom source in which the flux of any component can be separately adjusted. Using this design we have developed a Na–Li atom source for ultracold atom experiments. The fluxes of lithium and sodium are independently tunable, allowing operation as a single Na or Li source as well as a double source with equal atomic fluxes in each component...
The excess molar enthalpies HEm of the binary systems MF-NdF3 (M = Li, Na, K) were measured in the present work by high temperature calorimetry on a wide temperature (1220 K < T < 1400 K) and composition range. Some points of the equilibrium phase diagram have been also obtained by differential thermal analysis. Using the Hoch-Arpshofen model we represent the excess quantities of different syst...
We report the measurement, in a pulsed hollow-cathode discharge, of metastable quartet atoms of Li and Na. By using a tunable probe laser, population densities of 3x10(10) atoms cm(-3) and 10(11) atoms cm(-3) were measured in the Li(1s2s2p)4P degrees and Na(2p(5)3s3p)(4)D(7/2) levels, respectively. These levels are candidates for energy storage for extreme-ultraviolet lasers.
Current rechargeable batteries generally display limited cycle life and slow electrode kinetics and contain environmentally unfriendly components. Furthermore, their operation depends on the redox reactions of metal elements. We present an original battery system that depends on the redox of I(-)/I3 (-) couple in liquid cathode and the reversible enolization in polyimide anode, accompanied by L...
As high capacity cathodes for Li-ion and Na-ion batteries, carbon bonded and encapsulated selenium composites (C/Se) with a high loading content of 54% Se were synthesized by the in situ carbonization of a mixture of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) and selenium (Se) in a sealed vacuum glass tube. Because Se is physically encapsulated and chemically bonded by carbon, the sh...
Vega’s photospheric abundances of Li, Na, and K were determined by using considerably weak lines measured on the very high-S/N spectrum, while the non-LTE correction and the gravity-darkening correction were adequately taken into account. It was confirmed that these alkali elements are mildly underabundant ([Li/H] ≃ −0.6, [Na/H] ≃ −0.3, and [K/H] ≃ −0.2) compared to the solar system values, as ...
Authors: 5 Xin-Yi Xia, Email: [email protected] 6 Qiu-Yue Wu, Email: [email protected] 7 Li-Mei An, Email: [email protected] 8 Wei-Wei Li, Email: [email protected] 9 Na Li, Email: [email protected] 10 Tian-Fu Li, Email: [email protected] 11 Cui Zhang, Email: [email protected] 12 Ying-Xia Cui, Email: [email protected] 13 Xiao-Jun Li, Email: [email protected] 14 Chun-Yan Xue, Email: xuec...
A single-phase crystalline Na3V2O2(PO4)2F material has been prepared by the solvothermal method. Partial ion exchange between Na and Li was then used to form Na3−xLixV2O2(PO4)2F. The two materials were studied as positive cathodes by physical characterization, electrochemical measurements, and simulation. With density functional theory calculations, four stable phases of NaxV2O2(PO4)2F were ide...
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